diff options
Diffstat (limited to 'gnu/usr.bin/cc/cc1plus/typeck.c')
| -rw-r--r-- | gnu/usr.bin/cc/cc1plus/typeck.c | 7233 |
1 files changed, 7233 insertions, 0 deletions
diff --git a/gnu/usr.bin/cc/cc1plus/typeck.c b/gnu/usr.bin/cc/cc1plus/typeck.c new file mode 100644 index 0000000..fe8e7ba --- /dev/null +++ b/gnu/usr.bin/cc/cc1plus/typeck.c @@ -0,0 +1,7233 @@ +/* Build expressions with type checking for C++ compiler. + Copyright (C) 1987, 88, 89, 92, 93, 1994 Free Software Foundation, Inc. + Hacked by Michael Tiemann (tiemann@cygnus.com) + +This file is part of GNU CC. + +GNU CC is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU CC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU CC; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + + +/* This file is part of the C++ front end. + It contains routines to build C++ expressions given their operands, + including computing the types of the result, C and C++ specific error + checks, and some optimization. + + There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, + and to process initializations in declarations (since they work + like a strange sort of assignment). */ + +extern void error (); +extern void warning (); + +#include "config.h" +#include <stdio.h> +#include "tree.h" +#include "rtl.h" +#include "cp-tree.h" +#include "flags.h" + +int mark_addressable (); +static tree convert_for_assignment (); +/* static */ tree convert_for_initialization (); +extern tree shorten_compare (); +extern void binary_op_error (); +static tree pointer_int_sum (); +static tree pointer_diff (); +static tree convert_sequence (); +/* static */ tree unary_complex_lvalue (); + +extern rtx original_result_rtx; + +/* Return the target type of TYPE, which meas return T for: + T*, T&, T[], T (...), and otherwise, just T. */ + +tree +target_type (type) + tree type; +{ + if (TREE_CODE (type) == REFERENCE_TYPE) + type = TREE_TYPE (type); + while (TREE_CODE (type) == POINTER_TYPE + || TREE_CODE (type) == ARRAY_TYPE + || TREE_CODE (type) == FUNCTION_TYPE + || TREE_CODE (type) == METHOD_TYPE + || TREE_CODE (type) == OFFSET_TYPE) + type = TREE_TYPE (type); + return type; +} + +/* Do `exp = require_complete_type (exp);' to make sure exp + does not have an incomplete type. (That includes void types.) */ + +tree +require_complete_type (value) + tree value; +{ + tree type = TREE_TYPE (value); + + /* First, detect a valid value with a complete type. */ + if (TYPE_SIZE (type) != 0 + && type != void_type_node + && ! (TYPE_LANG_SPECIFIC (type) + && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)) + && TYPE_SIZE (SIGNATURE_TYPE (type)) == 0)) + return value; + + /* If we see X::Y, we build an OFFSET_TYPE which has + not been laid out. Try to avoid an error by interpreting + it as this->X::Y, if reasonable. */ + if (TREE_CODE (value) == OFFSET_REF + && C_C_D != 0 + && TREE_OPERAND (value, 0) == C_C_D) + { + tree base, member = TREE_OPERAND (value, 1); + tree basetype = TYPE_OFFSET_BASETYPE (type); + my_friendly_assert (TREE_CODE (member) == FIELD_DECL, 305); + base = convert_pointer_to (basetype, current_class_decl); + value = build (COMPONENT_REF, TREE_TYPE (member), + build_indirect_ref (base, NULL_PTR), member); + return require_complete_type (value); + } + + incomplete_type_error (value, type); + return error_mark_node; +} + +/* Return truthvalue of whether type of EXP is instantiated. */ +int +type_unknown_p (exp) + tree exp; +{ + return (TREE_CODE (exp) == TREE_LIST + || TREE_TYPE (exp) == unknown_type_node + || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE + && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)); +} + +/* Return truthvalue of whether T is function (or pfn) type. */ +int +fntype_p (t) + tree t; +{ + return (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE + || (TREE_CODE (t) == POINTER_TYPE + && (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (t)) == METHOD_TYPE))); +} + +/* Do `exp = require_instantiated_type (type, exp);' to make sure EXP + does not have an uninstantiated type. + TYPE is type to instantiate with, if uninstantiated. */ +tree +require_instantiated_type (type, exp, errval) + tree type, exp, errval; +{ + if (TREE_TYPE (exp) == NULL_TREE) + { + error ("argument list may not have an initializer list"); + return errval; + } + + if (TREE_TYPE (exp) == unknown_type_node + || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE + && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)) + { + exp = instantiate_type (type, exp, 1); + if (TREE_TYPE (exp) == error_mark_node) + return errval; + } + return exp; +} + +/* Return a variant of TYPE which has all the type qualifiers of LIKE + as well as those of TYPE. */ + +static tree +qualify_type (type, like) + tree type, like; +{ + int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); + int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); + /* @@ Must do member pointers here. */ + return c_build_type_variant (type, constflag, volflag); +} + +/* Return the common type of two parameter lists. + We assume that comptypes has already been done and returned 1; + if that isn't so, this may crash. + + As an optimization, free the space we allocate if the parameter + lists are already common. */ + +tree +commonparms (p1, p2) + tree p1, p2; +{ + tree oldargs = p1, newargs, n; + int i, len; + int any_change = 0; + char *first_obj = (char *) oballoc (0); + + len = list_length (p1); + newargs = tree_last (p1); + + if (newargs == void_list_node) + i = 1; + else + { + i = 0; + newargs = 0; + } + + for (; i < len; i++) + newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); + + n = newargs; + + for (i = 0; p1; + p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) + { + if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) + { + /* We used to give a warning here that advised about a default + argument being given in the prototype but not in the function's + declaration. It's best not to bother. */ + TREE_PURPOSE (n) = TREE_PURPOSE (p1); + any_change = 1; + } + else if (! TREE_PURPOSE (p1)) + { + if (TREE_PURPOSE (p2)) + { + TREE_PURPOSE (n) = TREE_PURPOSE (p2); + any_change = 1; + } + } + else + { + int cmp = simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2)); + if (cmp < 0) + my_friendly_abort (111); + if (cmp == 0) + any_change = 1; + TREE_PURPOSE (n) = TREE_PURPOSE (p2); + } + if (TREE_VALUE (p1) != TREE_VALUE (p2)) + { + any_change = 1; + TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); + } + else + TREE_VALUE (n) = TREE_VALUE (p1); + } + if (! any_change) + { + obfree (first_obj); + return oldargs; + } + + return newargs; +} + +/* Return the common type of two types. + We assume that comptypes has already been done and returned 1; + if that isn't so, this may crash. + + This is the type for the result of most arithmetic operations + if the operands have the given two types. + + We do not deal with enumeral types here because they have already been + converted to integer types. */ + +tree +common_type (t1, t2) + tree t1, t2; +{ + register enum tree_code code1; + register enum tree_code code2; + tree attributes; + + /* Save time if the two types are the same. */ + + if (t1 == t2) return t1; + + /* If one type is nonsense, use the other. */ + if (t1 == error_mark_node) + return t2; + if (t2 == error_mark_node) + return t1; + + /* Merge the attributes */ + + { register tree a1, a2; + a1 = TYPE_ATTRIBUTES (t1); + a2 = TYPE_ATTRIBUTES (t2); + + /* Either one unset? Take the set one. */ + + if (!(attributes = a1)) + attributes = a2; + + /* One that completely contains the other? Take it. */ + + else if (a2 && !attribute_list_contained (a1, a2)) + if (attribute_list_contained (a2, a1)) + attributes = a2; + else + { + /* Pick the longest list, and hang on the other + list. */ + + if (list_length (a1) < list_length (a2)) + attributes = a2, a2 = a1; + + for (; a2; a2 = TREE_CHAIN (a2)) + if (!value_member (attributes, a2)) + { + a1 = copy_node (a2); + TREE_CHAIN (a1) = attributes; + attributes = a1; + } + } + } + + /* Treat an enum type as the unsigned integer type of the same width. */ + + if (TREE_CODE (t1) == ENUMERAL_TYPE) + t1 = type_for_size (TYPE_PRECISION (t1), 1); + if (TREE_CODE (t2) == ENUMERAL_TYPE) + t2 = type_for_size (TYPE_PRECISION (t2), 1); + + code1 = TREE_CODE (t1); + code2 = TREE_CODE (t2); + + switch (code1) + { + case INTEGER_TYPE: + case REAL_TYPE: + /* If only one is real, use it as the result. */ + + if (code1 == REAL_TYPE && code2 != REAL_TYPE) + return build_type_attribute_variant (t1, attributes); + + if (code2 == REAL_TYPE && code1 != REAL_TYPE) + return build_type_attribute_variant (t2, attributes); + + /* Both real or both integers; use the one with greater precision. */ + + if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) + return build_type_attribute_variant (t1, attributes); + else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) + return build_type_attribute_variant (t2, attributes); + + /* Same precision. Prefer longs to ints even when same size. */ + + if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node + || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) + return build_type_attribute_variant (long_unsigned_type_node, + attributes); + + if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node + || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) + { + /* But preserve unsignedness from the other type, + since long cannot hold all the values of an unsigned int. */ + if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) + t1 = long_unsigned_type_node; + else + t1 = long_integer_type_node; + return build_type_attribute_variant (t1, attributes); + } + + /* Otherwise prefer the unsigned one. */ + + if (TREE_UNSIGNED (t1)) + return build_type_attribute_variant (t1, attributes); + else + return build_type_attribute_variant (t2, attributes); + + case POINTER_TYPE: + case REFERENCE_TYPE: + /* For two pointers, do this recursively on the target type, + and combine the qualifiers of the two types' targets. */ + /* This code was turned off; I don't know why. + But ANSI C++ specifies doing this with the qualifiers. + So I turned it on again. */ + { + tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)), + TYPE_MAIN_VARIANT (TREE_TYPE (t2))); + int constp + = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); + int volatilep + = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); + target = c_build_type_variant (target, constp, volatilep); + if (code1 == POINTER_TYPE) + t1 = build_pointer_type (target); + else + t1 = build_reference_type (target); + return build_type_attribute_variant (t1, attributes); + } +#if 0 + case POINTER_TYPE: + t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); + return build_type_attribute_variant (t1, attributes); + + case REFERENCE_TYPE: + t1 = build_reference_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); + return build_type_attribute_variant (t1, attributes); +#endif + + case ARRAY_TYPE: + { + tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); + /* Save space: see if the result is identical to one of the args. */ + if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) + return build_type_attribute_variant (t1, attributes); + if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) + return build_type_attribute_variant (t2, attributes); + /* Merge the element types, and have a size if either arg has one. */ + t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); + return build_type_attribute_variant (t1, attributes); + } + + case FUNCTION_TYPE: + /* Function types: prefer the one that specified arg types. + If both do, merge the arg types. Also merge the return types. */ + { + tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); + tree p1 = TYPE_ARG_TYPES (t1); + tree p2 = TYPE_ARG_TYPES (t2); + tree rval, raises; + + /* Save space: see if the result is identical to one of the args. */ + if (valtype == TREE_TYPE (t1) && ! p2) + return build_type_attribute_variant (t1, attributes); + if (valtype == TREE_TYPE (t2) && ! p1) + return build_type_attribute_variant (t2, attributes); + + /* Simple way if one arg fails to specify argument types. */ + if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) + { + rval = build_function_type (valtype, p2); + if ((raises = TYPE_RAISES_EXCEPTIONS (t2))) + rval = build_exception_variant (NULL_TREE, rval, raises); + return build_type_attribute_variant (rval, attributes); + } + raises = TYPE_RAISES_EXCEPTIONS (t1); + if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) + { + rval = build_function_type (valtype, p1); + if (raises) + rval = build_exception_variant (NULL_TREE, rval, raises); + return build_type_attribute_variant (rval, attributes); + } + + rval = build_function_type (valtype, commonparms (p1, p2)); + rval = build_exception_variant (NULL_TREE, rval, raises); + return build_type_attribute_variant (rval, attributes); + } + + case RECORD_TYPE: + case UNION_TYPE: + my_friendly_assert (TYPE_MAIN_VARIANT (t1) == t1 + && TYPE_MAIN_VARIANT (t2) == t2, 306); + + if (! binfo_or_else (t1, t2)) + compiler_error ("common_type called with uncommon aggregate types"); + return build_type_attribute_variant (t1, attributes); + + case METHOD_TYPE: + if (comptypes (TYPE_METHOD_BASETYPE (t1), TYPE_METHOD_BASETYPE (t2), 1) + && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) + { + /* Get this value the long way, since TYPE_METHOD_BASETYPE + is just the main variant of this. */ + tree basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1))); + tree raises, t3; + + raises = TYPE_RAISES_EXCEPTIONS (t1); + + /* If this was a member function type, get back to the + original type of type member function (i.e., without + the class instance variable up front. */ + t1 = build_function_type (TREE_TYPE (t1), TREE_CHAIN (TYPE_ARG_TYPES (t1))); + t2 = build_function_type (TREE_TYPE (t2), TREE_CHAIN (TYPE_ARG_TYPES (t2))); + t3 = common_type (t1, t2); + t3 = build_cplus_method_type (basetype, TREE_TYPE (t3), TYPE_ARG_TYPES (t3)); + t1 = build_exception_variant (basetype, t3, raises); + } + else + compiler_error ("common_type called with uncommon method types"); + + return build_type_attribute_variant (t1, attributes); + + case OFFSET_TYPE: + if (TYPE_OFFSET_BASETYPE (t1) == TYPE_OFFSET_BASETYPE (t2) + && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) + { + tree basetype = TYPE_OFFSET_BASETYPE (t1); + t1 = build_offset_type (basetype, + common_type (TREE_TYPE (t1), TREE_TYPE (t2))); + } + else + compiler_error ("common_type called with uncommon member types"); + + /* ... falls through ... */ + + default: + return build_type_attribute_variant (t1, attributes); + } +} + +/* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */ +int +compexcepttypes (t1, t2, strict) + tree t1, t2; + int strict; +{ + return TYPE_RAISES_EXCEPTIONS (t1) == TYPE_RAISES_EXCEPTIONS (t2); +} + +static int +comp_array_types (cmp, t1, t2, strict) + register int (*cmp)(); + tree t1, t2; + int strict; +{ + tree d1 = TYPE_DOMAIN (t1); + tree d2 = TYPE_DOMAIN (t2); + + /* Target types must match incl. qualifiers. */ + if (!(TREE_TYPE (t1) == TREE_TYPE (t2) + || (*cmp) (TREE_TYPE (t1), TREE_TYPE (t2), strict))) + return 0; + + /* Sizes must match unless one is missing or variable. */ + if (d1 == 0 || d2 == 0 || d1 == d2 + || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST + || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST + || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST + || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) + return 1; + + return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) + == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) + && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) + == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) + && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) + == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) + && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) + == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))); +} + +/* Return 1 if TYPE1 and TYPE2 are compatible types for assignment + or various other operations. This is what ANSI C++ speaks of as + "being the same". + + For C++: argument STRICT says we should be strict about this + comparison: + + 2 : strict, except that if one type is a reference and + the other is not, compare the target type of the + reference to the type that's not a reference (ARM, p308). + This is used for checking for illegal overloading. + 1 : strict (compared according to ANSI C) + This is used for checking whether two function decls match. + 0 : <= (compared according to C++) + -1: <= or >= (relaxed) + + Otherwise, pointers involving base classes and derived classes + can be mixed as legal: i.e. a pointer to a base class may be assigned + to a pointer to one of its derived classes, as per C++. A pointer to + a derived class may be passed as a parameter to a function expecting a + pointer to a base classes. These allowances do not commute. In this + case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to + be the derived class. */ +int +comptypes (type1, type2, strict) + tree type1, type2; + int strict; +{ + register tree t1 = type1; + register tree t2 = type2; + int attrval, val; + + /* Suppress errors caused by previously reported errors */ + + if (t1 == t2) + return 1; + + /* This should never happen. */ + my_friendly_assert (t1 != error_mark_node, 307); + + if (t2 == error_mark_node) + return 0; + + if (strict < 0) + { + /* Treat an enum type as the unsigned integer type of the same width. */ + + if (TREE_CODE (t1) == ENUMERAL_TYPE) + t1 = type_for_size (TYPE_PRECISION (t1), 1); + if (TREE_CODE (t2) == ENUMERAL_TYPE) + t2 = type_for_size (TYPE_PRECISION (t2), 1); + + if (t1 == t2) + return 1; + } + + /* Different classes of types can't be compatible. */ + + if (TREE_CODE (t1) != TREE_CODE (t2)) + { + if (strict == 2 + && ((TREE_CODE (t1) == REFERENCE_TYPE) + ^ (TREE_CODE (t2) == REFERENCE_TYPE))) + { + if (TREE_CODE (t1) == REFERENCE_TYPE) + return comptypes (TREE_TYPE (t1), t2, 1); + return comptypes (t1, TREE_TYPE (t2), 1); + } + + return 0; + } + if (strict > 1) + strict = 1; + + /* Qualifiers must match. */ + + if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) + return 0; + if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) + return 0; + + /* Allow for two different type nodes which have essentially the same + definition. Note that we already checked for equality of the type + type qualifiers (just above). */ + + if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) + return 1; + +#ifdef COMP_TYPE_ATTRIBUTES + if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) + return 0; +#else + /* 1 if no need for warning yet, 2 if warning cause has been seen. */ + attrval = 1; +#endif + + /* 1 if no need for warning yet, 2 if warning cause has been seen. */ + val = 0; + + switch (TREE_CODE (t1)) + { + case RECORD_TYPE: + case UNION_TYPE: + if (strict <= 0) + goto look_hard; + return 0; + + case OFFSET_TYPE: + val = (comptypes (TYPE_POINTER_TO (TYPE_OFFSET_BASETYPE (t1)), + TYPE_POINTER_TO (TYPE_OFFSET_BASETYPE (t2)), strict) + && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)); + break; + + case METHOD_TYPE: + if (! compexcepttypes (t1, t2, strict)) + return 0; + + /* This case is anti-symmetrical! + One can pass a base member (or member function) + to something expecting a derived member (or member function), + but not vice-versa! */ + + val = (comptypes (TYPE_POINTER_TO (TYPE_METHOD_BASETYPE (t2)), + TYPE_POINTER_TO (TYPE_METHOD_BASETYPE (t1)), strict) + && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict) + && compparms (TREE_CHAIN (TYPE_ARG_TYPES (t1)), + TREE_CHAIN (TYPE_ARG_TYPES (t2)), strict)); + break; + + case POINTER_TYPE: + case REFERENCE_TYPE: + t1 = TREE_TYPE (t1); + t2 = TREE_TYPE (t2); + if (t1 == t2) + { + val = 1; + break; + } + if (strict <= 0) + { + if (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE) + { + int rval; + look_hard: + rval = t1 == t2 || UNIQUELY_DERIVED_FROM_P (t1, t2); + + if (rval) + { + val = 1; + break; + } + if (strict < 0) + { + val = UNIQUELY_DERIVED_FROM_P (t2, t1); + break; + } + } + return 0; + } + else + val = comptypes (t1, t2, strict); + break; + + case FUNCTION_TYPE: + if (! compexcepttypes (t1, t2, strict)) + return 0; + + val = ((TREE_TYPE (t1) == TREE_TYPE (t2) + || comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)) + && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); + break; + + case ARRAY_TYPE: + /* Target types must match incl. qualifiers. */ + val = comp_array_types (comptypes, t1, t2, strict); + break; + + case TEMPLATE_TYPE_PARM: + return 1; + + case UNINSTANTIATED_P_TYPE: + return UPT_TEMPLATE (t1) == UPT_TEMPLATE (t2); + } + return attrval == 2 && val == 1 ? 2 : val; +} + +/* Return 1 if TTL and TTR are pointers to types that are equivalent, + ignoring their qualifiers. + + NPTRS is the number of pointers we can strip off and keep cool. + This is used to permit (for aggr A, aggr B) A, B* to convert to A*, + but to not permit B** to convert to A**. */ + +int +comp_target_types (ttl, ttr, nptrs) + tree ttl, ttr; + int nptrs; +{ + ttl = TYPE_MAIN_VARIANT (ttl); + ttr = TYPE_MAIN_VARIANT (ttr); + if (ttl == ttr) + return 1; + if (TREE_CODE (ttr) == TEMPLATE_TYPE_PARM) + return 1; + + if (TREE_CODE (ttr) != TREE_CODE (ttl)) + return 0; + + if (TREE_CODE (ttr) == POINTER_TYPE) + { + if (TREE_CODE (TREE_TYPE (ttl)) == POINTER_TYPE + || TREE_CODE (TREE_TYPE (ttl)) == ARRAY_TYPE) + return comp_ptr_ttypes (TREE_TYPE (ttl), TREE_TYPE (ttr)); + else + return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs - 1); + } + + if (TREE_CODE (ttr) == REFERENCE_TYPE) + return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); + if (TREE_CODE (ttr) == ARRAY_TYPE) + return comp_array_types (comp_target_types, ttl, ttr, 0); + else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE) + if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) + switch (comp_target_parms (TYPE_ARG_TYPES (ttl), TYPE_ARG_TYPES (ttr), 1)) + { + case 0: + return 0; + case 1: + return 1; + case 2: + cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", + ttr, ttl); + return 1; + default: + my_friendly_abort (112); + } + else + return 0; + + /* for C++ */ + else if (TREE_CODE (ttr) == OFFSET_TYPE) + { + /* Contravariance: we can assign a pointer to base member to a pointer + to derived member. Note difference from simple pointer case, where + we can pass a pointer to derived to a pointer to base. */ + if (comptypes (TYPE_OFFSET_BASETYPE (ttr), TYPE_OFFSET_BASETYPE (ttl), 0)) + return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); + else if (comptypes (TYPE_OFFSET_BASETYPE (ttl), TYPE_OFFSET_BASETYPE (ttr), 0) + && comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) + { + cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", + ttr, ttl); + return 1; + } + } + else if (IS_AGGR_TYPE (ttl)) + { + if (nptrs < 0) + return 0; + return comptypes (TYPE_POINTER_TO (ttl), TYPE_POINTER_TO (ttr), 0); + } + + return 0; +} + +/* If two types share a common base type, return that basetype. + If there is not a unique most-derived base type, this function + returns ERROR_MARK_NODE. */ +tree +common_base_type (tt1, tt2) + tree tt1, tt2; +{ + tree best = NULL_TREE, tmp; + int i; + + /* If one is a baseclass of another, that's good enough. */ + if (UNIQUELY_DERIVED_FROM_P (tt1, tt2)) + return tt1; + if (UNIQUELY_DERIVED_FROM_P (tt2, tt1)) + return tt2; + + /* If they share a virtual baseclass, that's good enough. */ + for (tmp = CLASSTYPE_VBASECLASSES (tt1); tmp; tmp = TREE_CHAIN (tmp)) + { + if (binfo_member (BINFO_TYPE (tmp), CLASSTYPE_VBASECLASSES (tt2))) + return BINFO_TYPE (tmp); + } + + /* Otherwise, try to find a unique baseclass of TT1 + that is shared by TT2, and follow that down. */ + for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--) + { + tree basetype = TYPE_BINFO_BASETYPE (tt1, i); + tree trial = common_base_type (basetype, tt2); + if (trial) + { + if (trial == error_mark_node) + return trial; + if (best == NULL_TREE) + best = trial; + else if (best != trial) + return error_mark_node; + } + } + + /* Same for TT2. */ + for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--) + { + tree basetype = TYPE_BINFO_BASETYPE (tt2, i); + tree trial = common_base_type (tt1, basetype); + if (trial) + { + if (trial == error_mark_node) + return trial; + if (best == NULL_TREE) + best = trial; + else if (best != trial) + return error_mark_node; + } + } + return best; +} + +/* Subroutines of `comptypes'. */ + +/* Return 1 if two parameter type lists PARMS1 and PARMS2 + are equivalent in the sense that functions with those parameter types + can have equivalent types. + If either list is empty, we win. + Otherwise, the two lists must be equivalent, element by element. + + C++: See comment above about TYPE1, TYPE2, STRICT. + If STRICT == 3, it means checking is strict, but do not compare + default parameter values. */ +int +compparms (parms1, parms2, strict) + tree parms1, parms2; + int strict; +{ + register tree t1 = parms1, t2 = parms2; + + /* An unspecified parmlist matches any specified parmlist + whose argument types don't need default promotions. */ + + if (strict <= 0 && t1 == 0) + return self_promoting_args_p (t2); + if (strict < 0 && t2 == 0) + return self_promoting_args_p (t1); + + while (1) + { + if (t1 == 0 && t2 == 0) + return 1; + /* If one parmlist is shorter than the other, + they fail to match, unless STRICT is <= 0. */ + if (t1 == 0 || t2 == 0) + { + if (strict > 0) + return 0; + if (strict < 0) + return 1; + if (strict == 0) + return t1 && TREE_PURPOSE (t1); + } + if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict)) + { + if (strict > 0) + return 0; + if (strict == 0) + return t2 == void_list_node && TREE_PURPOSE (t1); + return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); + } + if (strict != 3 && TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) + { + int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); + if (cmp < 0) + my_friendly_abort (113); + if (cmp == 0) + return 0; + } + + t1 = TREE_CHAIN (t1); + t2 = TREE_CHAIN (t2); + } +} + +/* This really wants return whether or not parameter type lists + would make their owning functions assignment compatible or not. */ +int +comp_target_parms (parms1, parms2, strict) + tree parms1, parms2; + int strict; +{ + register tree t1 = parms1, t2 = parms2; + int warn_contravariance = 0; + + /* An unspecified parmlist matches any specified parmlist + whose argument types don't need default promotions. + @@@ see 13.3.3 for a counterexample... */ + + if (t1 == 0 && t2 != 0) + { + cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'", + parms2); + return self_promoting_args_p (t2); + } + if (t2 == 0) + return self_promoting_args_p (t1); + + for (; t1 || t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) + { + tree p1, p2; + + /* If one parmlist is shorter than the other, + they fail to match, unless STRICT is <= 0. */ + if (t1 == 0 || t2 == 0) + { + if (strict > 0) + return 0; + if (strict < 0) + return 1 + warn_contravariance; + return ((t1 && TREE_PURPOSE (t1)) + warn_contravariance); + } + p1 = TREE_VALUE (t1); + p2 = TREE_VALUE (t2); + if (p1 == p2) + continue; + if (TREE_CODE (p2) == TEMPLATE_TYPE_PARM) + continue; + + if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE) + || (TREE_CODE (p1) == REFERENCE_TYPE && TREE_CODE (p2) == REFERENCE_TYPE)) + { + if (strict <= 0 + && (TYPE_MAIN_VARIANT (TREE_TYPE (p1)) + == TYPE_MAIN_VARIANT (TREE_TYPE (p2)))) + continue; + + if (TREE_CODE (TREE_TYPE (p2)) == TEMPLATE_TYPE_PARM) + continue; + + /* The following is wrong for contravariance, + but many programs depend on it. */ + if (TREE_TYPE (p1) == void_type_node) + continue; + if (TREE_TYPE (p2) == void_type_node) + { + warn_contravariance = 1; + continue; + } + if (IS_AGGR_TYPE (TREE_TYPE (p1))) + { + if (comptypes (p2, p1, 0) == 0) + { + if (comptypes (p1, p2, 0) != 0) + warn_contravariance = 1; + else + return 0; + } + continue; + } + } + /* Note backwards order due to contravariance. */ + if (comp_target_types (p2, p1, 1) == 0) + { + if (comp_target_types (p1, p2, 1)) + { + warn_contravariance = 1; + continue; + } + if (strict != 0) + return 0; +#if 0 + /* What good do these cases do? */ + if (strict == 0) + return p2 == void_type_node && TREE_PURPOSE (t1); + return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); +#endif + } + /* Target types are compatible--just make sure that if + we use parameter lists, that they are ok as well. */ + if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE) + switch (comp_target_parms (TYPE_ARG_TYPES (p1), + TYPE_ARG_TYPES (p2), + strict)) + { + case 0: + return 0; + case 1: + break; + case 2: + warn_contravariance = 1; + } + + if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) + { + int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); + if (cmp < 0) + my_friendly_abort (114); + if (cmp == 0) + return 0; + } + } + return 1 + warn_contravariance; +} + +/* Return 1 if PARMS specifies a fixed number of parameters + and none of their types is affected by default promotions. */ + +int +self_promoting_args_p (parms) + tree parms; +{ + register tree t; + for (t = parms; t; t = TREE_CHAIN (t)) + { + register tree type = TREE_VALUE (t); + + if (TREE_CHAIN (t) == 0 && type != void_type_node) + return 0; + + if (TYPE_MAIN_VARIANT (type) == float_type_node) + return 0; + + if (type == 0) + return 0; + + if (C_PROMOTING_INTEGER_TYPE_P (type)) + return 0; + } + return 1; +} + +/* Return an unsigned type the same as TYPE in other respects. + + C++: must make these work for type variants as well. */ + +tree +unsigned_type (type) + tree type; +{ + tree type1 = TYPE_MAIN_VARIANT (type); + if (type1 == signed_char_type_node || type1 == char_type_node) + return unsigned_char_type_node; + if (type1 == integer_type_node) + return unsigned_type_node; + if (type1 == short_integer_type_node) + return short_unsigned_type_node; + if (type1 == long_integer_type_node) + return long_unsigned_type_node; + if (type1 == long_long_integer_type_node) + return long_long_unsigned_type_node; + return type; +} + +/* Return a signed type the same as TYPE in other respects. */ + +tree +signed_type (type) + tree type; +{ + tree type1 = TYPE_MAIN_VARIANT (type); + if (type1 == unsigned_char_type_node || type1 == char_type_node) + return signed_char_type_node; + if (type1 == unsigned_type_node) + return integer_type_node; + if (type1 == short_unsigned_type_node) + return short_integer_type_node; + if (type1 == long_unsigned_type_node) + return long_integer_type_node; + if (type1 == long_long_unsigned_type_node) + return long_long_integer_type_node; + return type; +} + +/* Return a type the same as TYPE except unsigned or + signed according to UNSIGNEDP. */ + +tree +signed_or_unsigned_type (unsignedp, type) + int unsignedp; + tree type; +{ + if (! INTEGRAL_TYPE_P (type)) + return type; + if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) + return unsignedp ? unsigned_char_type_node : signed_char_type_node; + if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) + return unsignedp ? unsigned_type_node : integer_type_node; + if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) + return unsignedp ? short_unsigned_type_node : short_integer_type_node; + if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) + return unsignedp ? long_unsigned_type_node : long_integer_type_node; + if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) + return (unsignedp ? long_long_unsigned_type_node + : long_long_integer_type_node); + return type; +} + +tree +c_sizeof (type) + tree type; +{ + enum tree_code code = TREE_CODE (type); + tree t; + + if (code == FUNCTION_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids taking the sizeof a function type"); + return size_int (1); + } + if (code == METHOD_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids taking the sizeof a method type"); + return size_int (1); + } + if (code == VOID_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids taking the sizeof a void type"); + return size_int (1); + } + if (code == ERROR_MARK) + return size_int (1); + + /* ARM $5.3.2: ``When applied to a reference, the result is the size of the + referenced object.'' */ + if (code == REFERENCE_TYPE) + type = TREE_TYPE (type); + + /* We couldn't find anything in the ARM or the draft standard that says, + one way or the other, if doing sizeof on something that doesn't have + an object associated with it is correct or incorrect. For example, if + you declare `struct S { char str[16]; };', and in your program do + a `sizeof (S::str)', should we flag that as an error or should we give + the size of it? Since it seems like a reasonable thing to do, we'll go + with giving the value. */ + if (code == OFFSET_TYPE) + type = TREE_TYPE (type); + + /* @@ This also produces an error for a signature ref. + In that case we should be able to do better. */ + if (IS_SIGNATURE (type)) + { + error ("`sizeof' applied to a signature type"); + return size_int (0); + } + + if (TYPE_SIZE (type) == 0) + { + error ("`sizeof' applied to an incomplete type"); + return size_int (0); + } + + /* Convert in case a char is more than one unit. */ + t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), + size_int (TYPE_PRECISION (char_type_node))); + /* size_binop does not put the constant in range, so do it now. */ + if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) + TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; + return t; +} + +tree +c_sizeof_nowarn (type) + tree type; +{ + enum tree_code code = TREE_CODE (type); + tree t; + + if (code == FUNCTION_TYPE + || code == METHOD_TYPE + || code == VOID_TYPE + || code == ERROR_MARK) + return size_int (1); + if (code == REFERENCE_TYPE) + type = TREE_TYPE (type); + + if (TYPE_SIZE (type) == 0) + { +#if 0 + /* ??? Tiemann, why have any diagnostic here? + There is none in the corresponding function for C. */ + warning ("sizeof applied to an incomplete type"); +#endif + return size_int (0); + } + + /* Convert in case a char is more than one unit. */ + t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), + size_int (TYPE_PRECISION (char_type_node))); + force_fit_type (t, 0); + return t; +} + +/* Implement the __alignof keyword: Return the minimum required + alignment of TYPE, measured in bytes. */ + +tree +c_alignof (type) + tree type; +{ + enum tree_code code = TREE_CODE (type); + tree t; + + if (code == FUNCTION_TYPE || code == METHOD_TYPE) + return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); + + if (code == VOID_TYPE || code == ERROR_MARK) + return size_int (1); + + /* C++: this is really correct! */ + if (code == REFERENCE_TYPE) + type = TREE_TYPE (type); + + /* @@ This also produces an error for a signature ref. + In that case we should be able to do better. */ + if (IS_SIGNATURE (type)) + { + error ("`__alignof' applied to a signature type"); + return size_int (1); + } + + t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); + force_fit_type (t, 0); + return t; +} + +/* Perform default promotions for C data used in expressions. + Arrays and functions are converted to pointers; + enumeral types or short or char, to int. + In addition, manifest constants symbols are replaced by their values. + + C++: this will automatically bash references to their target type. */ + +tree +default_conversion (exp) + tree exp; +{ + register tree type = TREE_TYPE (exp); + register enum tree_code code = TREE_CODE (type); + + if (code == OFFSET_TYPE /* || TREE_CODE (exp) == OFFSET_REF */ ) + { + if (TREE_CODE (exp) == OFFSET_REF) + return default_conversion (resolve_offset_ref (exp)); + + type = TREE_TYPE (type); + code = TREE_CODE (type); + } + + if (code == REFERENCE_TYPE) + { + exp = convert_from_reference (exp); + type = TREE_TYPE (exp); + code = TREE_CODE (type); + } + + /* Constants can be used directly unless they're not loadable. */ + if (TREE_CODE (exp) == CONST_DECL) + exp = DECL_INITIAL (exp); + /* Replace a nonvolatile const static variable with its value. */ + else if (TREE_READONLY_DECL_P (exp) && DECL_MODE (exp) != BLKmode) + { + exp = decl_constant_value (exp); + type = TREE_TYPE (exp); + } + + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ + + if (INTEGRAL_CODE_P (code)) + { + tree t = type_promotes_to (type); + if (t != TYPE_MAIN_VARIANT (type)) + return convert (t, exp); + } + if (flag_traditional + && TYPE_MAIN_VARIANT (type) == float_type_node) + return convert (double_type_node, exp); + if (code == VOID_TYPE) + { + error ("void value not ignored as it ought to be"); + return error_mark_node; + } + if (code == FUNCTION_TYPE) + { + return build_unary_op (ADDR_EXPR, exp, 0); + } + if (code == METHOD_TYPE) + { + if (TREE_CODE (exp) == OFFSET_REF) + { + my_friendly_assert (TREE_CODE (TREE_OPERAND (exp, 1)) == FUNCTION_DECL, + 308); + return build_unary_op (ADDR_EXPR, TREE_OPERAND (exp, 1), 0); + } + return build_unary_op (ADDR_EXPR, exp, 0); + } + if (code == ARRAY_TYPE) + { + register tree adr; + tree restype; + tree ptrtype; + int constp, volatilep; + + if (TREE_CODE (exp) == INDIRECT_REF) + { + /* Stripping away the INDIRECT_REF is not the right + thing to do for references... */ + tree inner = TREE_OPERAND (exp, 0); + if (TREE_CODE (TREE_TYPE (inner)) == REFERENCE_TYPE) + { + inner = build1 (CONVERT_EXPR, + build_pointer_type (TREE_TYPE (TREE_TYPE (inner))), + inner); + TREE_REFERENCE_EXPR (inner) = 1; + } + return convert (TYPE_POINTER_TO (TREE_TYPE (type)), inner); + } + + if (TREE_CODE (exp) == COMPOUND_EXPR) + { + tree op1 = default_conversion (TREE_OPERAND (exp, 1)); + return build (COMPOUND_EXPR, TREE_TYPE (op1), + TREE_OPERAND (exp, 0), op1); + } + + if (!lvalue_p (exp) + && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) + { + error ("invalid use of non-lvalue array"); + return error_mark_node; + } + + constp = volatilep = 0; + if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' + || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') + { + constp = TREE_READONLY (exp); + volatilep = TREE_THIS_VOLATILE (exp); + } + + restype = TREE_TYPE (type); + if (TYPE_READONLY (type) || TYPE_VOLATILE (type) + || constp || volatilep) + restype = c_build_type_variant (restype, + TYPE_READONLY (type) || constp, + TYPE_VOLATILE (type) || volatilep); + ptrtype = build_pointer_type (restype); + + if (TREE_CODE (exp) == VAR_DECL) + { + /* ??? This is not really quite correct + in that the type of the operand of ADDR_EXPR + is not the target type of the type of the ADDR_EXPR itself. + Question is, can this lossage be avoided? */ + adr = build1 (ADDR_EXPR, ptrtype, exp); + if (mark_addressable (exp) == 0) + return error_mark_node; + TREE_CONSTANT (adr) = staticp (exp); + TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ + return adr; + } + /* This way is better for a COMPONENT_REF since it can + simplify the offset for a component. */ + adr = build_unary_op (ADDR_EXPR, exp, 1); + return convert (ptrtype, adr); + } + return exp; +} + +tree +build_object_ref (datum, basetype, field) + tree datum, basetype, field; +{ + if (datum == error_mark_node) + return error_mark_node; + else if (IS_SIGNATURE (IDENTIFIER_TYPE_VALUE (basetype))) + { + warning ("signature name in scope resolution ignored"); + return build_component_ref (datum, field, NULL_TREE, 1); + } + else if (is_aggr_typedef (basetype, 1)) + { + tree real_basetype = IDENTIFIER_TYPE_VALUE (basetype); + tree binfo = binfo_or_else (real_basetype, TREE_TYPE (datum)); + if (binfo) + return build_component_ref (build_scoped_ref (datum, basetype), + field, binfo, 1); + } + return error_mark_node; +} + +/* Like `build_component_ref, but uses an already found field. + Must compute access for C_C_D. Otherwise, ok. */ +tree +build_component_ref_1 (datum, field, protect) + tree datum, field; + int protect; +{ + register tree basetype = TREE_TYPE (datum); + register enum tree_code code = TREE_CODE (basetype); + register tree ref; + + if (code == REFERENCE_TYPE) + { + datum = convert_from_reference (datum); + basetype = TREE_TYPE (datum); + code = TREE_CODE (basetype); + } + + if (! IS_AGGR_TYPE_CODE (code)) + { + if (code != ERROR_MARK) + cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", + field, datum, basetype); + return error_mark_node; + } + + if (TYPE_SIZE (basetype) == 0) + { + incomplete_type_error (0, basetype); + return error_mark_node; + } + + /* Look up component name in the structure type definition. */ + + if (field == error_mark_node) + my_friendly_abort (115); + + if (TREE_STATIC (field)) + return field; + + if (datum == C_C_D) + { + enum access_type access + = compute_access (TYPE_BINFO (current_class_type), field); + + if (access == access_private) + { + cp_error ("field `%D' is private", field); + return error_mark_node; + } + else if (access == access_protected) + { + cp_error ("field `%D' is protected", field); + return error_mark_node; + } + } + + ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); + + if (TREE_READONLY (datum) || TREE_READONLY (field)) + TREE_READONLY (ref) = 1; + if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) + TREE_THIS_VOLATILE (ref) = 1; + if (DECL_MUTABLE_P (field)) + TREE_READONLY (ref) = 0; + + return ref; +} + +/* Given a COND_EXPR in T, return it in a form that we can, for + example, use as an lvalue. This code used to be in unary_complex_lvalue, + but we needed it to deal with `a = (d == c) ? b : c' expressions, where + we're dealing with aggregates. So, we now call this in unary_complex_lvalue, + and in build_modify_expr. The case (in particular) that led to this was + with CODE == ADDR_EXPR, since it's not an lvalue when we'd get it there. */ +static tree +rationalize_conditional_expr (code, t) + enum tree_code code; + tree t; +{ + return + build_conditional_expr (TREE_OPERAND (t, 0), + build_unary_op (code, TREE_OPERAND (t, 1), 0), + build_unary_op (code, TREE_OPERAND (t, 2), 0)); +} + +tree +build_component_ref (datum, component, basetype_path, protect) + tree datum, component, basetype_path; + int protect; +{ + register tree basetype = TREE_TYPE (datum); + register enum tree_code code = TREE_CODE (basetype); + register tree field = NULL; + register tree ref; + + /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it + unless we are not to support things not strictly ANSI. */ + switch (TREE_CODE (datum)) + { + case COMPOUND_EXPR: + { + tree value = build_component_ref (TREE_OPERAND (datum, 1), component, + basetype_path, protect); + return build (COMPOUND_EXPR, TREE_TYPE (value), + TREE_OPERAND (datum, 0), value); + } + case COND_EXPR: + return build_conditional_expr + (TREE_OPERAND (datum, 0), + build_component_ref (TREE_OPERAND (datum, 1), component, + basetype_path, protect), + build_component_ref (TREE_OPERAND (datum, 2), component, + basetype_path, protect)); + } + + if (code == REFERENCE_TYPE) + { +#if 0 + /* TREE_REFERENCE_EXPRs are not converted by `convert_from_reference'. + @@ Maybe that is not right. */ + if (TREE_REFERENCE_EXPR (datum)) + datum = build1 (INDIRECT_REF, TREE_TYPE (basetype), datum); + else +#endif + datum = convert_from_reference (datum); + basetype = TREE_TYPE (datum); + code = TREE_CODE (basetype); + } + + /* First, see if there is a field or component with name COMPONENT. */ + if (TREE_CODE (component) == TREE_LIST) + { + my_friendly_assert (!(TREE_CHAIN (component) == NULL_TREE + && DECL_CHAIN (TREE_VALUE (component)) == NULL_TREE), 309); + return build (COMPONENT_REF, TREE_TYPE (component), datum, component); + } +#if 0 + if (TREE_CODE (component) == TYPE_EXPR) + return build_component_type_expr (datum, component, NULL_TREE, protect); +#endif + + if (! IS_AGGR_TYPE_CODE (code)) + { + if (code != ERROR_MARK) + cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", + component, datum, basetype); + return error_mark_node; + } + + if (TYPE_SIZE (basetype) == 0) + { + incomplete_type_error (0, basetype); + return error_mark_node; + } + + if (TREE_CODE (component) == BIT_NOT_EXPR) + { + if (TYPE_IDENTIFIER (basetype) != TREE_OPERAND (component, 0)) + { + cp_error ("destructor specifier `%T::~%T' must have matching names", + basetype, TREE_OPERAND (component, 0)); + return error_mark_node; + } + if (! TYPE_HAS_DESTRUCTOR (basetype)) + { + cp_error ("type `%T' has no destructor", basetype); + return error_mark_node; + } + return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 0); + } + + /* Look up component name in the structure type definition. */ + if (CLASSTYPE_VFIELD (basetype) + && DECL_NAME (CLASSTYPE_VFIELD (basetype)) == component) + /* Special-case this because if we use normal lookups in an ambiguous + hierarchy, the compiler will abort (because vptr lookups are + not supposed to be ambiguous. */ + field = CLASSTYPE_VFIELD (basetype); + else + { + if (basetype_path == NULL_TREE) + basetype_path = TYPE_BINFO (basetype); + field = lookup_field (basetype_path, component, + protect && ! VFIELD_NAME_P (component), 0); + if (field == error_mark_node) + return error_mark_node; + + if (field == NULL_TREE) + { + /* Not found as a data field, look for it as a method. If found, + then if this is the only possible one, return it, else + report ambiguity error. */ + tree fndecls = lookup_fnfields (basetype_path, component, 1); + if (fndecls == error_mark_node) + return error_mark_node; + if (fndecls) + { + if (TREE_CHAIN (fndecls) == NULL_TREE + && DECL_CHAIN (TREE_VALUE (fndecls)) == NULL_TREE) + { + enum access_type access; + tree fndecl; + + /* Unique, so use this one now. */ + basetype = TREE_PURPOSE (fndecls); + fndecl = TREE_VALUE (fndecls); + access = compute_access (TREE_PURPOSE (fndecls), fndecl); + if (access == access_public) + { + if (DECL_VINDEX (fndecl) + && ! resolves_to_fixed_type_p (datum, 0)) + { + tree addr = build_unary_op (ADDR_EXPR, datum, 0); + addr = convert_pointer_to (DECL_CONTEXT (fndecl), addr); + datum = build_indirect_ref (addr, NULL_PTR); + my_friendly_assert (datum != error_mark_node, 310); + fndecl = build_vfn_ref (&addr, datum, DECL_VINDEX (fndecl)); + } + return fndecl; + } + if (access == access_protected) + cp_error ("member function `%D' is protected", fndecl); + else + cp_error ("member function `%D' is private", fndecl); + return error_mark_node; + } + else + return build (COMPONENT_REF, unknown_type_node, datum, fndecls); + } + +#if 0 + if (component == ansi_opname[(int) TYPE_EXPR]) + cp_error ("`%#T' has no such type conversion operator", basetype); + else +#endif + cp_error ("`%#T' has no member named `%D'", basetype, component); + return error_mark_node; + } + else if (TREE_TYPE (field) == error_mark_node) + return error_mark_node; + + if (TREE_CODE (field) != FIELD_DECL) + { + if (TREE_CODE (field) == TYPE_DECL) + { + cp_error ("invalid use of type decl `%#D' as expression", field); + return error_mark_node; + } + if (DECL_RTL (field) != 0) + assemble_external (field); + TREE_USED (field) = 1; + return field; + } + } + + if (DECL_FIELD_CONTEXT (field) != basetype + && TYPE_USES_COMPLEX_INHERITANCE (basetype)) + { + tree addr = build_unary_op (ADDR_EXPR, datum, 0); + if (integer_zerop (addr)) + { + error ("invalid reference to NULL ptr, use ptr-to-member instead"); + return error_mark_node; + } + addr = convert_pointer_to (DECL_FIELD_CONTEXT (field), addr); + datum = build_indirect_ref (addr, NULL_PTR); + my_friendly_assert (datum != error_mark_node, 311); + } + ref = build (COMPONENT_REF, TREE_TYPE (field), break_out_cleanups (datum), field); + + if (TREE_READONLY (datum) || TREE_READONLY (field)) + TREE_READONLY (ref) = 1; + if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) + TREE_THIS_VOLATILE (ref) = 1; + if (DECL_MUTABLE_P (field)) + TREE_READONLY (ref) = 0; + + return ref; +} + +/* Given an expression PTR for a pointer, return an expression + for the value pointed to. + ERRORSTRING is the name of the operator to appear in error messages. + + This function may need to overload OPERATOR_FNNAME. + Must also handle REFERENCE_TYPEs for C++. */ + +tree +build_x_indirect_ref (ptr, errorstring) + tree ptr; + char *errorstring; +{ + tree rval = build_opfncall (INDIRECT_REF, LOOKUP_NORMAL, ptr, NULL_TREE, NULL_TREE); + if (rval) + return rval; + return build_indirect_ref (ptr, errorstring); +} + +tree +build_indirect_ref (ptr, errorstring) + tree ptr; + char *errorstring; +{ + register tree pointer = default_conversion (ptr); + register tree type = TREE_TYPE (pointer); + + if (ptr == current_class_decl) + return C_C_D; + + if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) + { + if (TREE_CODE (pointer) == ADDR_EXPR + && (TREE_TYPE (TREE_OPERAND (pointer, 0)) + == TREE_TYPE (type))) + return TREE_OPERAND (pointer, 0); + else + { + tree t = TREE_TYPE (type); + register tree ref = build1 (INDIRECT_REF, + TYPE_MAIN_VARIANT (t), pointer); + + TREE_READONLY (ref) = TYPE_READONLY (t); + TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); + TREE_SIDE_EFFECTS (ref) + = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); + return ref; + } + } + /* `pointer' won't be an error_mark_node if we were given a + pointer to member, so it's cool to check for this here. */ + else if (TYPE_PTRMEMFUNC_P (type)) + error ("invalid use of `%s' on pointer to member function", errorstring); + else if (TREE_CODE (type) == RECORD_TYPE + && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) + error ("cannot dereference signature pointer/reference"); + else if (pointer != error_mark_node) + { + if (errorstring) + error ("invalid type argument of `%s'", errorstring); + else + error ("invalid type argument"); + } + return error_mark_node; +} + +/* This handles expressions of the form "a[i]", which denotes + an array reference. + + This is logically equivalent in C to *(a+i), but we may do it differently. + If A is a variable or a member, we generate a primitive ARRAY_REF. + This avoids forcing the array out of registers, and can work on + arrays that are not lvalues (for example, members of structures returned + by functions). + + If INDEX is of some user-defined type, it must be converted to + integer type. Otherwise, to make a compatible PLUS_EXPR, it + will inherit the type of the array, which will be some pointer type. */ + +tree +build_x_array_ref (array, index) + tree array, index; +{ + tree rval = build_opfncall (ARRAY_REF, LOOKUP_NORMAL, array, index, NULL_TREE); + if (rval) + return rval; + return build_array_ref (array, index); +} + +tree +build_array_ref (array, idx) + tree array, idx; +{ + tree itype; + + if (idx == 0) + { + error ("subscript missing in array reference"); + return error_mark_node; + } + + if (TREE_TYPE (array) == error_mark_node + || TREE_TYPE (idx) == error_mark_node) + return error_mark_node; + + itype = TREE_TYPE (idx); + /* We must check here for the reference, so we can do the possible + conversions immediately afterwards. */ + if (TREE_CODE (itype) == REFERENCE_TYPE) + { + idx = convert_from_reference (idx); + itype = TREE_TYPE (idx); + } + + if (IS_AGGR_TYPE (itype)) + { + if (TYPE_HAS_INT_CONVERSION (itype)) + idx = build_type_conversion (CONVERT_EXPR, + integer_type_node, idx, 1); + else + { + error_with_aggr_type (itype, + "type `%s' requires integer conversion for array indexing"); + return error_mark_node; + } + } + + if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE + && TREE_CODE (array) != INDIRECT_REF) + { + tree rval, type; + + /* Subscripting with type char is likely to lose + on a machine where chars are signed. + So warn on any machine, but optionally. + Don't warn for unsigned char since that type is safe. + Don't warn for signed char because anyone who uses that + must have done so deliberately. */ + if (warn_char_subscripts + && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node) + warning ("array subscript has type `char'"); + + /* Apply default promotions *after* noticing character types. */ + idx = default_conversion (idx); + + if (TREE_CODE (TREE_TYPE (idx)) != INTEGER_TYPE) + { + error ("array subscript is not an integer"); + return error_mark_node; + } + + /* An array that is indexed by a non-constant + cannot be stored in a register; we must be able to do + address arithmetic on its address. + Likewise an array of elements of variable size. */ + if (TREE_CODE (idx) != INTEGER_CST + || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 + && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) + { + if (mark_addressable (array) == 0) + return error_mark_node; + } + /* An array that is indexed by a constant value which is not within + the array bounds cannot be stored in a register either; because we + would get a crash in store_bit_field/extract_bit_field when trying + to access a non-existent part of the register. */ + if (TREE_CODE (idx) == INTEGER_CST + && TYPE_VALUES (TREE_TYPE (array)) + && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array)))) + { + if (mark_addressable (array) == 0) + return error_mark_node; + } + + /* Note in C++ we don't bother warning about subscripting a + `register' array, since it's legal in C++ to take the address + of something with that storage specification. */ + if (pedantic && !lvalue_p (array)) + pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); + + if (pedantic) + { + tree foo = array; + while (TREE_CODE (foo) == COMPONENT_REF) + foo = TREE_OPERAND (foo, 0); + if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) + pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); + } + + type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); + rval = build (ARRAY_REF, type, array, idx); + /* Array ref is const/volatile if the array elements are + or if the array is.. */ + TREE_READONLY (rval) + |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) + | TREE_READONLY (array)); + TREE_SIDE_EFFECTS (rval) + |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) + | TREE_SIDE_EFFECTS (array)); + TREE_THIS_VOLATILE (rval) + |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) + /* This was added by rms on 16 Nov 91. + It fixes vol struct foo *a; a->elts[1] + in an inline function. + Hope it doesn't break something else. */ + | TREE_THIS_VOLATILE (array)); + return require_complete_type (fold (rval)); + } + + { + tree ar = default_conversion (array); + tree ind = default_conversion (idx); + + /* Put the integer in IND to simplify error checking. */ + if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) + { + tree temp = ar; + ar = ind; + ind = temp; + } + + if (ar == error_mark_node) + return ar; + + if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) + { + error ("subscripted value is neither array nor pointer"); + return error_mark_node; + } + if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) + { + error ("array subscript is not an integer"); + return error_mark_node; + } + + return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR, ar, ind, PLUS_EXPR), + "array indexing"); + } +} + +/* Build a function call to function FUNCTION with parameters PARAMS. + PARAMS is a list--a chain of TREE_LIST nodes--in which the + TREE_VALUE of each node is a parameter-expression. + FUNCTION's data type may be a function type or a pointer-to-function. + + For C++: If FUNCTION's data type is a TREE_LIST, then the tree list + is the list of possible methods that FUNCTION could conceivably + be. If the list of methods comes from a class, then it will be + a list of lists (where each element is associated with the class + that produced it), otherwise it will be a simple list (for + functions overloaded in global scope). + + In the first case, TREE_VALUE (function) is the head of one of those + lists, and TREE_PURPOSE is the name of the function. + + In the second case, TREE_PURPOSE (function) is the function's + name directly. + + DECL is the class instance variable, usually CURRENT_CLASS_DECL. */ + +/* + * [eichin:19911015.1726EST] actually return a possibly incomplete + * type + */ +tree +build_x_function_call (function, params, decl) + tree function, params, decl; +{ + tree type; + int is_method; + + if (function == error_mark_node) + return error_mark_node; + + type = TREE_TYPE (function); + is_method = ((TREE_CODE (function) == TREE_LIST + && current_class_type != NULL_TREE + && IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function)) == function) + || TREE_CODE (function) == IDENTIFIER_NODE + || TREE_CODE (type) == METHOD_TYPE + || TYPE_PTRMEMFUNC_P (type)); + + /* Handle methods, friends, and overloaded functions, respectively. */ + if (is_method) + { + if (TREE_CODE (function) == FUNCTION_DECL) + { + if (DECL_NAME (function)) + function = DECL_NAME (function); + else + function = TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)); + } + else if (TREE_CODE (function) == TREE_LIST) + { +#if 0 + if (TREE_CODE (TREE_VALUE (function)) == TREE_LIST) + function = TREE_PURPOSE (TREE_VALUE (function)); + else + function = TREE_PURPOSE (function); +#else + my_friendly_assert (TREE_CODE (TREE_VALUE (function)) == FUNCTION_DECL, 312); + function = TREE_PURPOSE (function); +#endif + } + else if (TREE_CODE (function) != IDENTIFIER_NODE) + { + if (TREE_CODE (function) == OFFSET_REF) + { + if (TREE_OPERAND (function, 0)) + decl = TREE_OPERAND (function, 0); + } + /* Call via a pointer to member function. */ + if (decl == NULL_TREE) + { + error ("pointer to member function called, but not in class scope"); + return error_mark_node; + } + /* What other type of POINTER_TYPE could this be? */ + if (TREE_CODE (TREE_TYPE (function)) != POINTER_TYPE + && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function)) + && TREE_CODE (function) != OFFSET_REF) + function = build (OFFSET_REF, TREE_TYPE (type), NULL_TREE, function); + goto do_x_function; + } + + /* this is an abbreviated method call. + must go through here in case it is a virtual function. + @@ Perhaps this could be optimized. */ + + if (decl == NULL_TREE) + { + if (current_class_type == NULL_TREE) + { + error ("object missing in call to method `%s'", + IDENTIFIER_POINTER (function)); + return error_mark_node; + } + /* Yow: call from a static member function. */ + decl = build1 (NOP_EXPR, TYPE_POINTER_TO (current_class_type), + error_mark_node); + decl = build_indirect_ref (decl, NULL_PTR); + } + + return build_method_call (decl, function, params, + NULL_TREE, LOOKUP_NORMAL); + } + else if (TREE_CODE (function) == COMPONENT_REF + && type == unknown_type_node) + { + /* Should we undo what was done in build_component_ref? */ + if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function, 1))) == TREE_VEC) + /* Get the name that build_component_ref hid. */ + function = DECL_NAME (TREE_VALUE (TREE_OPERAND (function, 1))); + else + function = TREE_PURPOSE (TREE_OPERAND (function, 1)); + return build_method_call (decl, function, params, + NULL_TREE, LOOKUP_NORMAL); + } + else if (TREE_CODE (function) == TREE_LIST) + { + if (TREE_VALUE (function) == NULL_TREE) + { + cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?", + TREE_PURPOSE (function)); + return error_mark_node; + } + else + { + tree val = TREE_VALUE (function); + + if (TREE_CODE (val) == TEMPLATE_DECL) + return build_overload_call_maybe + (function, params, LOOKUP_COMPLAIN, (struct candidate *)0); + else if (DECL_CHAIN (val) != NULL_TREE) + return build_overload_call + (function, params, LOOKUP_COMPLAIN, (struct candidate *)0); + else + my_friendly_abort (360); + } + } + + do_x_function: + if (TREE_CODE (function) == OFFSET_REF) + { + /* If the component is a data element (or a virtual function), we play + games here to make things work. */ + tree decl_addr; + + if (TREE_OPERAND (function, 0)) + decl = TREE_OPERAND (function, 0); + else + decl = C_C_D; + + decl_addr = build_unary_op (ADDR_EXPR, decl, 0); + function = get_member_function_from_ptrfunc (&decl_addr, decl, + TREE_OPERAND (function, 1)); + params = tree_cons (NULL_TREE, decl_addr, params); + return build_function_call (function, params); + } + + type = TREE_TYPE (function); + if (type != error_mark_node) + { + if (TREE_CODE (type) == REFERENCE_TYPE) + type = TREE_TYPE (type); + + if (TYPE_LANG_SPECIFIC (type) && TYPE_OVERLOADS_CALL_EXPR (type)) + return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, function, params, NULL_TREE); + } + + if (is_method) + { + tree fntype = TREE_TYPE (function); + tree ctypeptr; + + /* Explicitly named method? */ + if (TREE_CODE (function) == FUNCTION_DECL) + ctypeptr = TYPE_POINTER_TO (DECL_CLASS_CONTEXT (function)); + /* Expression with ptr-to-method type? It could either be a plain + usage, or it might be a case where the ptr-to-method is being + passed in as an argument. */ + else if (TYPE_PTRMEMFUNC_P (fntype)) + { + tree rec = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (fntype))); + ctypeptr = TYPE_POINTER_TO (rec); + } + /* Unexpected node type? */ + else + my_friendly_abort (116); + if (decl == NULL_TREE) + { + if (current_function_decl + && DECL_STATIC_FUNCTION_P (current_function_decl)) + error ("invalid call to member function needing `this' in static member function scope"); + else + error ("pointer to member function called, but not in class scope"); + return error_mark_node; + } + if (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE + && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl))) + { + decl = build_unary_op (ADDR_EXPR, decl, 0); + decl = convert_pointer_to (TREE_TYPE (ctypeptr), decl); + } + else + decl = build_c_cast (ctypeptr, decl); + params = tree_cons (NULL_TREE, decl, params); + } + + return build_function_call (function, params); +} + +/* Resolve a pointer to member function. INSTANCE is the object + instance to use, if the member points to a virtual member. */ + +tree +get_member_function_from_ptrfunc (instance_ptrptr, instance, function) + tree *instance_ptrptr; + tree instance; + tree function; +{ + if (TREE_CODE (function) == OFFSET_REF) + { + function = TREE_OPERAND (function, 1); + } + + if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) + { + tree fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); + tree index = save_expr (convert (integer_type_node, + build_component_ref (function, + index_identifier, + 0, 0))); + tree e1 = build (GT_EXPR, integer_type_node, index, integer_zero_node); + tree delta = build_component_ref (function, delta_identifier, 0, 0); + tree delta2 = DELTA2_FROM_PTRMEMFUNC (function); + tree e2; + tree e3; + tree aref, vtbl; + + /* convert down to the right base, before using the instance. */ + instance = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)), + build_unary_op (ADDR_EXPR, instance, 0)); + if (instance == error_mark_node) + return instance; + + vtbl = convert_pointer_to (ptr_type_node, instance); + vtbl + = build (PLUS_EXPR, + build_pointer_type (build_pointer_type (vtable_entry_type)), + vtbl, convert (sizetype, delta2)); + vtbl = build_indirect_ref (vtbl, NULL_PTR); + aref = build_array_ref (vtbl, size_binop (MINUS_EXPR, + index, + integer_one_node)); + if (! flag_vtable_thunks) + { + aref = save_expr (aref); + + /* Save the intermediate result in a SAVE_EXPR so we don't have to + compute each component of the virtual function pointer twice. */ + if (/* !building_cleanup && */ TREE_CODE (aref) == INDIRECT_REF) + TREE_OPERAND (aref, 0) = save_expr (TREE_OPERAND (aref, 0)); + + delta = build (PLUS_EXPR, integer_type_node, + build_conditional_expr (e1, build_component_ref (aref, delta_identifier, 0, 0), integer_zero_node), + delta); + } + + *instance_ptrptr = build (PLUS_EXPR, TREE_TYPE (*instance_ptrptr), + *instance_ptrptr, + convert (integer_type_node, delta)); + if (flag_vtable_thunks) + e2 = aref; + else + e2 = build_component_ref (aref, pfn_identifier, 0, 0); + + e3 = PFN_FROM_PTRMEMFUNC (function); + TREE_TYPE (e2) = TREE_TYPE (e3); + function = build_conditional_expr (e1, e2, e3); + } + return function; +} + +tree +build_function_call_real (function, params, require_complete, flags) + tree function, params; + int require_complete, flags; +{ + register tree fntype, fndecl; + register tree value_type; + register tree coerced_params; + tree name = NULL_TREE, assembler_name = NULL_TREE; + int is_method; + + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ + if (TREE_CODE (function) == NOP_EXPR + && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) + function = TREE_OPERAND (function, 0); + + if (TREE_CODE (function) == FUNCTION_DECL) + { + name = DECL_NAME (function); + assembler_name = DECL_ASSEMBLER_NAME (function); + + GNU_xref_call (current_function_decl, + IDENTIFIER_POINTER (name ? name + : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)))); + assemble_external (function); + fndecl = function; + + /* Convert anything with function type to a pointer-to-function. */ + if (pedantic + && name + && IDENTIFIER_LENGTH (name) == 4 + && ! strcmp (IDENTIFIER_POINTER (name), "main") + && DECL_CONTEXT (function) == NULL_TREE) + { + pedwarn ("ANSI C++ forbids calling `main' from within program"); + } + + /* Differs from default_conversion by not setting TREE_ADDRESSABLE + (because calling an inline function does not mean the function + needs to be separately compiled). */ + + if (DECL_INLINE (function)) + { + fntype = build_type_variant (TREE_TYPE (function), + TREE_READONLY (function), + TREE_THIS_VOLATILE (function)); + function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); + } + else + { + assemble_external (function); + TREE_USED (function) = 1; + function = default_conversion (function); + } + } + else + { + fndecl = NULL_TREE; + + /* Convert anything with function type to a pointer-to-function. */ + if (function == error_mark_node) + return error_mark_node; + function = default_conversion (function); + } + + fntype = TREE_TYPE (function); + + if (TYPE_PTRMEMFUNC_P (fntype)) + { + tree instance_ptr = build_unary_op (ADDR_EXPR, C_C_D, 0); + fntype = TYPE_PTRMEMFUNC_FN_TYPE (fntype); + function = get_member_function_from_ptrfunc (&instance_ptr, C_C_D, function); + } + + is_method = (TREE_CODE (fntype) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); + + if (!((TREE_CODE (fntype) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) + || is_method)) + { + error ("called object is not a function"); + return error_mark_node; + } + + /* fntype now gets the type of function pointed to. */ + fntype = TREE_TYPE (fntype); + + /* Convert the parameters to the types declared in the + function prototype, or apply default promotions. */ + + if (flags & LOOKUP_COMPLAIN) + coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), + params, fndecl, LOOKUP_NORMAL); + else + coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), + params, fndecl, 0); + + /* Check for errors in format strings. */ + + if (warn_format && (name || assembler_name)) + check_function_format (name, assembler_name, coerced_params); + + /* Recognize certain built-in functions so we can make tree-codes + other than CALL_EXPR. We do this when it enables fold-const.c + to do something useful. */ + + if (TREE_CODE (function) == ADDR_EXPR + && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL + && DECL_BUILT_IN (TREE_OPERAND (function, 0))) + switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) + { + case BUILT_IN_ABS: + case BUILT_IN_LABS: + case BUILT_IN_FABS: + if (coerced_params == 0) + return integer_zero_node; + return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); + } + + /* C++ */ + value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node; + { + register tree result = + build (CALL_EXPR, value_type, + function, coerced_params, NULL_TREE); + + TREE_SIDE_EFFECTS (result) = 1; + /* Remove this sometime. */ + TREE_RAISES (result) |= !! TYPE_RAISES_EXCEPTIONS (fntype); + if (! require_complete) + return result; + if (value_type == void_type_node) + return result; + return require_complete_type (result); + } +} + +tree +build_function_call (function, params) + tree function, params; +{ + return build_function_call_real (function, params, 1, LOOKUP_NORMAL); +} + +tree +build_function_call_maybe (function, params) + tree function, params; +{ + return build_function_call_real (function, params, 0, 0); +} + + +/* Convert the actual parameter expressions in the list VALUES + to the types in the list TYPELIST. + If parmdecls is exhausted, or when an element has NULL as its type, + perform the default conversions. + + RETURN_LOC is the location of the return value, if known, NULL_TREE + otherwise. This is useful in the case where we can avoid creating + a temporary variable in the case where we can initialize the return + value directly. If we are not eliding constructors, then we set this + to NULL_TREE to avoid this avoidance. + + NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. + + This is also where warnings about wrong number of args are generated. + + Return a list of expressions for the parameters as converted. + + Both VALUES and the returned value are chains of TREE_LIST nodes + with the elements of the list in the TREE_VALUE slots of those nodes. + + In C++, unspecified trailing parameters can be filled in with their + default arguments, if such were specified. Do so here. */ + +tree +convert_arguments (return_loc, typelist, values, fndecl, flags) + tree return_loc, typelist, values, fndecl; + int flags; +{ + extern tree gc_protect_fndecl; + register tree typetail, valtail; + register tree result = NULL_TREE; + char *called_thing; + int maybe_raises = 0; + int i = 0; + + if (! flag_elide_constructors) + return_loc = 0; + + if (fndecl) + { + if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) + { + if (DECL_NAME (fndecl) == NULL_TREE + || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) + called_thing = "constructor"; + else + called_thing = "member function"; + } + else + called_thing = "function"; + } + + for (valtail = values, typetail = typelist; + valtail; + valtail = TREE_CHAIN (valtail), i++) + { + register tree type = typetail ? TREE_VALUE (typetail) : 0; + register tree val = TREE_VALUE (valtail); + + if (type == void_type_node) + { + if (fndecl) + { + char *buf = (char *)alloca (40 + strlen (called_thing)); + sprintf (buf, "too many arguments to %s `%%s'", called_thing); + error_with_decl (fndecl, buf); + error ("at this point in file"); + } + else + error ("too many arguments to function"); + /* In case anybody wants to know if this argument + list is valid. */ + if (result) + TREE_TYPE (tree_last (result)) = error_mark_node; + break; + } + + /* The tree type of the parameter being passed may not yet be + known. In this case, its type is TYPE_UNKNOWN, and will + be instantiated by the type given by TYPE. If TYPE + is also NULL, the tree type of VAL is ERROR_MARK_NODE. */ + if (type && type_unknown_p (val)) + val = require_instantiated_type (type, val, integer_zero_node); + else if (type_unknown_p (val)) + { + /* Strip the `&' from an overloaded FUNCTION_DECL. */ + if (TREE_CODE (val) == ADDR_EXPR) + val = TREE_OPERAND (val, 0); + if (TREE_CODE (val) == TREE_LIST + && TREE_CHAIN (val) == NULL_TREE + && TREE_TYPE (TREE_VALUE (val)) != NULL_TREE + && (TREE_TYPE (val) == unknown_type_node + || DECL_CHAIN (TREE_VALUE (val)) == NULL_TREE)) + /* Instantiates automatically. */ + val = TREE_VALUE (val); + else + { + error ("insufficient type information in parameter list"); + val = integer_zero_node; + } + } + else if (TREE_CODE (val) == OFFSET_REF + && TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) + { + /* This is unclean. Should be handled elsewhere. */ + val = build_unary_op (ADDR_EXPR, val, 0); + } + else if (TREE_CODE (val) == OFFSET_REF) + val = resolve_offset_ref (val); + + { +#if 0 + /* This code forces the assumption that if we have a ptr-to-func + type in an arglist, that every routine that wants to check + its validity has done so, and thus we need not do any + more conversion. I don't remember why this is necessary. */ + else if (TREE_CODE (ttype) == FUNCTION_TYPE + && (type == NULL + || TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)) + { + type = build_pointer_type (ttype); + } +#endif + } + + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ + if (TREE_CODE (val) == NOP_EXPR + && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) + && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) + val = TREE_OPERAND (val, 0); + + if ((type == 0 || TREE_CODE (type) != REFERENCE_TYPE) + && (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE + || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE)) + val = default_conversion (val); + + val = require_complete_type (val); + + if (val == error_mark_node) + continue; + + maybe_raises |= TREE_RAISES (val); + + if (type != 0) + { + /* Formal parm type is specified by a function prototype. */ + tree parmval; + + if (TYPE_SIZE (type) == 0) + { + error ("parameter type of called function is incomplete"); + parmval = val; + } + else + { +#ifdef PROMOTE_PROTOTYPES + /* Rather than truncating and then reextending, + convert directly to int, if that's the type we will want. */ + if (! flag_traditional + && (TREE_CODE (type) == INTEGER_TYPE + || TREE_CODE (type) == ENUMERAL_TYPE) + && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) + type = integer_type_node; +#endif + parmval = convert_for_initialization (return_loc, type, val, flags, + "argument passing", fndecl, i); +#ifdef PROMOTE_PROTOTYPES + if ((TREE_CODE (type) == INTEGER_TYPE + || TREE_CODE (type) == ENUMERAL_TYPE) + && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) + parmval = default_conversion (parmval); +#endif + } + result = tree_cons (NULL_TREE, parmval, result); + } + else + { + if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE) + val = convert_from_reference (val); + + if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE + && (TYPE_PRECISION (TREE_TYPE (val)) + < TYPE_PRECISION (double_type_node))) + /* Convert `float' to `double'. */ + result = tree_cons (NULL_TREE, convert (double_type_node, val), result); + else if (TYPE_LANG_SPECIFIC (TREE_TYPE (val)) + && (TYPE_HAS_INIT_REF (TREE_TYPE (val)) + || TYPE_HAS_ASSIGN_REF (TREE_TYPE (val)))) + { + cp_warning ("cannot pass objects of type `%T' through `...'", + TREE_TYPE (val)); + result = tree_cons (NULL_TREE, val, result); + } + else + /* Convert `short' and `char' to full-size `int'. */ + result = tree_cons (NULL_TREE, default_conversion (val), result); + } + + if (flag_gc + /* There are certain functions for which we don't need + to protect our arguments. GC_PROTECT_FNDECL is one. */ + && fndecl != gc_protect_fndecl + && type_needs_gc_entry (TREE_TYPE (TREE_VALUE (result))) + && ! value_safe_from_gc (NULL_TREE, TREE_VALUE (result))) + /* This will build a temporary variable whose cleanup is + to clear the obstack entry. */ + TREE_VALUE (result) = protect_value_from_gc (NULL_TREE, + TREE_VALUE (result)); + + if (typetail) + typetail = TREE_CHAIN (typetail); + } + + if (typetail != 0 && typetail != void_list_node) + { + /* See if there are default arguments that can be used */ + if (TREE_PURPOSE (typetail)) + { + while (typetail != void_list_node) + { + tree type = TREE_VALUE (typetail); + tree val = TREE_PURPOSE (typetail); + tree parmval; + + if (val == NULL_TREE) + parmval = error_mark_node; + else if (TREE_CODE (val) == CONSTRUCTOR) + { + parmval = digest_init (type, val, (tree *)0); + parmval = convert_for_initialization (return_loc, type, parmval, flags, + "default constructor", fndecl, i); + } + else + { + /* This could get clobbered by the following call. */ + if (TREE_HAS_CONSTRUCTOR (val)) + val = copy_node (val); + + parmval = convert_for_initialization (return_loc, type, val, flags, + "default argument", fndecl, i); +#ifdef PROMOTE_PROTOTYPES + if ((TREE_CODE (type) == INTEGER_TYPE + || TREE_CODE (type) == ENUMERAL_TYPE) + && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) + parmval = default_conversion (parmval); +#endif + } + maybe_raises |= TREE_RAISES (parmval); + + if (flag_gc + && type_needs_gc_entry (TREE_TYPE (parmval)) + && ! value_safe_from_gc (NULL_TREE, parmval)) + parmval = protect_value_from_gc (NULL_TREE, parmval); + + result = tree_cons (0, parmval, result); + typetail = TREE_CHAIN (typetail); + /* ends with `...'. */ + if (typetail == NULL_TREE) + break; + } + } + else + { + if (fndecl) + { + char *buf = (char *)alloca (32 + strlen (called_thing)); + sprintf (buf, "too few arguments to %s `%%#D'", called_thing); + cp_error_at (buf, fndecl); + error ("at this point in file"); + } + else + error ("too few arguments to function"); + return error_mark_list; + } + } + if (result) + TREE_RAISES (result) = maybe_raises; + + return nreverse (result); +} + +/* Build a binary-operation expression, after performing default + conversions on the operands. CODE is the kind of expression to build. */ + +tree +build_x_binary_op (code, arg1, arg2) + enum tree_code code; + tree arg1, arg2; +{ + tree rval = build_opfncall (code, LOOKUP_SPECULATIVELY, + arg1, arg2, NULL_TREE); + if (rval) + return build_opfncall (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); + if (code == MEMBER_REF) + return build_m_component_ref (build_indirect_ref (arg1, NULL_PTR), + arg2); + return build_binary_op (code, arg1, arg2, 1); +} + +tree +build_binary_op (code, arg1, arg2, convert_p) + enum tree_code code; + tree arg1, arg2; + int convert_p; +{ + tree type1, type2; + tree args[2]; + + args[0] = arg1; + args[1] = arg2; + + if (convert_p) + { + args[0] = default_conversion (args[0]); + args[1] = default_conversion (args[1]); + + if (type_unknown_p (args[0])) + { + args[0] = instantiate_type (TREE_TYPE (args[1]), args[0], 1); + args[0] = default_conversion (args[0]); + } + else if (type_unknown_p (args[1])) + { + args[1] = require_instantiated_type (TREE_TYPE (args[0]), + args[1], + error_mark_node); + args[1] = default_conversion (args[1]); + } + + type1 = TREE_TYPE (args[0]); + type2 = TREE_TYPE (args[1]); + + if (IS_AGGR_TYPE_2 (type1, type2) && ! TYPE_PTRMEMFUNC_P (type1)) + { + /* Try to convert this to something reasonable. */ + if (! build_default_binary_type_conversion(code, &args[0], &args[1])) + return error_mark_node; + } + else if ((IS_AGGR_TYPE (type1) && ! TYPE_PTRMEMFUNC_P (type1)) + || (IS_AGGR_TYPE (type2) && ! TYPE_PTRMEMFUNC_P (type2))) + { + int convert_index = IS_AGGR_TYPE (type2); + /* Avoid being tripped up by things like (ARG1 != 0). */ + tree types[2], try; + + types[0] = type1; types[1] = type2; + if (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR) + try = build_type_conversion (code, bool_type_node, + args[convert_index], 1); + else + { + try = build_type_conversion (code, types[convert_index ^ 1], + args[convert_index], 1); + + if (try == 0 + && args[1] == integer_zero_node + && (code == NE_EXPR || code == EQ_EXPR)) + try = build_type_conversion (code, ptr_type_node, + args[convert_index], 1); + } + + if (try == 0) + { + cp_error ("no match for `%O(%#T, %#T)'", code, + TREE_TYPE (arg1), TREE_TYPE (arg2)); + return error_mark_node; + } + if (try == error_mark_node) + error ("ambiguous pointer conversion"); + args[convert_index] = try; + } + } + return build_binary_op_nodefault (code, args[0], args[1], code); +} + +/* Build a binary-operation expression without default conversions. + CODE is the kind of expression to build. + This function differs from `build' in several ways: + the data type of the result is computed and recorded in it, + warnings are generated if arg data types are invalid, + special handling for addition and subtraction of pointers is known, + and some optimization is done (operations on narrow ints + are done in the narrower type when that gives the same result). + Constant folding is also done before the result is returned. + + ERROR_CODE is the code that determines what to say in error messages. + It is usually, but not always, the same as CODE. + + Note that the operands will never have enumeral types + because either they have just had the default conversions performed + or they have both just been converted to some other type in which + the arithmetic is to be done. + + C++: must do special pointer arithmetic when implementing + multiple inheritance, and deal with pointer to member functions. */ + +tree +build_binary_op_nodefault (code, orig_op0, orig_op1, error_code) + enum tree_code code; + tree orig_op0, orig_op1; + enum tree_code error_code; +{ + tree op0, op1; + register enum tree_code code0, code1; + tree type0, type1; + + /* Expression code to give to the expression when it is built. + Normally this is CODE, which is what the caller asked for, + but in some special cases we change it. */ + register enum tree_code resultcode = code; + + /* Data type in which the computation is to be performed. + In the simplest cases this is the common type of the arguments. */ + register tree result_type = NULL; + + /* Nonzero means operands have already been type-converted + in whatever way is necessary. + Zero means they need to be converted to RESULT_TYPE. */ + int converted = 0; + + /* Nonzero means after finally constructing the expression + give it this type. Otherwise, give it type RESULT_TYPE. */ + tree final_type = 0; + + /* Nonzero if this is an operation like MIN or MAX which can + safely be computed in short if both args are promoted shorts. + Also implies COMMON. + -1 indicates a bitwise operation; this makes a difference + in the exact conditions for when it is safe to do the operation + in a narrower mode. */ + int shorten = 0; + + /* Nonzero if this is a comparison operation; + if both args are promoted shorts, compare the original shorts. + Also implies COMMON. */ + int short_compare = 0; + + /* Nonzero if this is a right-shift operation, which can be computed on the + original short and then promoted if the operand is a promoted short. */ + int short_shift = 0; + + /* Nonzero means set RESULT_TYPE to the common type of the args. */ + int common = 0; + + /* Apply default conversions. */ + op0 = default_conversion (orig_op0); + op1 = default_conversion (orig_op1); + + type0 = TREE_TYPE (op0); + type1 = TREE_TYPE (op1); + + /* The expression codes of the data types of the arguments tell us + whether the arguments are integers, floating, pointers, etc. */ + code0 = TREE_CODE (type0); + code1 = TREE_CODE (type1); + + /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ + STRIP_TYPE_NOPS (op0); + STRIP_TYPE_NOPS (op1); + + /* If an error was already reported for one of the arguments, + avoid reporting another error. */ + + if (code0 == ERROR_MARK || code1 == ERROR_MARK) + return error_mark_node; + + switch (code) + { + case PLUS_EXPR: + /* Handle the pointer + int case. */ + if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) + return pointer_int_sum (PLUS_EXPR, op0, op1); + else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) + return pointer_int_sum (PLUS_EXPR, op1, op0); + else + common = 1; + break; + + case MINUS_EXPR: + /* Subtraction of two similar pointers. + We must subtract them as integers, then divide by object size. */ + if (code0 == POINTER_TYPE && code1 == POINTER_TYPE + && comp_target_types (type0, type1, 1)) + return pointer_diff (op0, op1); + /* Handle pointer minus int. Just like pointer plus int. */ + else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) + return pointer_int_sum (MINUS_EXPR, op0, op1); + else + common = 1; + break; + + case MULT_EXPR: + common = 1; + break; + + case TRUNC_DIV_EXPR: + case CEIL_DIV_EXPR: + case FLOOR_DIV_EXPR: + case ROUND_DIV_EXPR: + case EXACT_DIV_EXPR: + if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) + && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) + { + if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) + cp_warning ("division by zero in `%E / 0'", op0); + else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1)) + cp_warning ("division by zero in `%E / 0.'", op0); + + if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) + resultcode = RDIV_EXPR; + else + /* When dividing two signed integers, we have to promote to int. + unless we divide by a conatant != -1. Note that default + conversion will have been performed on the operands at this + point, so we have to dig out the original type to find out if + it was unsigned. */ + shorten = ((TREE_CODE (op0) == NOP_EXPR + && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) + || (TREE_CODE (op1) == INTEGER_CST + && (TREE_INT_CST_LOW (op1) != -1 + || TREE_INT_CST_HIGH (op1) != -1))); + common = 1; + } + break; + + case BIT_AND_EXPR: + case BIT_ANDTC_EXPR: + case BIT_IOR_EXPR: + case BIT_XOR_EXPR: + if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) + shorten = -1; + /* If one operand is a constant, and the other is a short type + that has been converted to an int, + really do the work in the short type and then convert the + result to int. If we are lucky, the constant will be 0 or 1 + in the short type, making the entire operation go away. */ + if (TREE_CODE (op0) == INTEGER_CST + && TREE_CODE (op1) == NOP_EXPR + && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) + && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) + { + final_type = result_type; + op1 = TREE_OPERAND (op1, 0); + result_type = TREE_TYPE (op1); + } + if (TREE_CODE (op1) == INTEGER_CST + && TREE_CODE (op0) == NOP_EXPR + && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) + && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) + { + final_type = result_type; + op0 = TREE_OPERAND (op0, 0); + result_type = TREE_TYPE (op0); + } + break; + + case TRUNC_MOD_EXPR: + case FLOOR_MOD_EXPR: + if (code1 == INTEGER_TYPE && integer_zerop (op1)) + cp_warning ("division by zero in `%E % 0'", op0); + else if (code1 == REAL_TYPE && real_zerop (op1)) + cp_warning ("division by zero in `%E % 0.'", op0); + + if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) + { + /* Although it would be tempting to shorten always here, that loses + on some targets, since the modulo instruction is undefined if the + quotient can't be represented in the computation mode. We shorten + only if unsigned or if dividing by something we know != -1. */ + shorten = ((TREE_CODE (op0) == NOP_EXPR + && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) + || (TREE_CODE (op1) == INTEGER_CST + && (TREE_INT_CST_LOW (op1) != -1 + || TREE_INT_CST_HIGH (op1) != -1))); + common = 1; + } + break; + + case TRUTH_ANDIF_EXPR: + case TRUTH_ORIF_EXPR: + case TRUTH_AND_EXPR: + case TRUTH_OR_EXPR: + result_type = bool_type_node; + op0 = bool_truthvalue_conversion (op0); + op1 = bool_truthvalue_conversion (op1); + converted = 1; + break; + + /* Shift operations: result has same type as first operand; + always convert second operand to int. + Also set SHORT_SHIFT if shifting rightward. */ + + case RSHIFT_EXPR: + if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) + { + result_type = type0; + if (TREE_CODE (op1) == INTEGER_CST) + { + if (tree_int_cst_lt (op1, integer_zero_node)) + warning ("right shift count is negative"); + else + { + if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) + short_shift = 1; + if (TREE_INT_CST_HIGH (op1) != 0 + || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) + >= TYPE_PRECISION (type0))) + warning ("right shift count >= width of type"); + } + } + /* Convert the shift-count to an integer, regardless of + size of value being shifted. */ + if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) + op1 = convert (integer_type_node, op1); + /* Avoid converting op1 to result_type later. */ + converted = 1; + } + break; + + case LSHIFT_EXPR: + if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) + { + result_type = type0; + if (TREE_CODE (op1) == INTEGER_CST) + { + if (tree_int_cst_lt (op1, integer_zero_node)) + warning ("left shift count is negative"); + else if (TREE_INT_CST_HIGH (op1) != 0 + || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) + >= TYPE_PRECISION (type0))) + warning ("left shift count >= width of type"); + } + /* Convert the shift-count to an integer, regardless of + size of value being shifted. */ + if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) + op1 = convert (integer_type_node, op1); + /* Avoid converting op1 to result_type later. */ + converted = 1; + } + break; + + case RROTATE_EXPR: + case LROTATE_EXPR: + if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) + { + result_type = type0; + if (TREE_CODE (op1) == INTEGER_CST) + { + if (tree_int_cst_lt (op1, integer_zero_node)) + warning ("%s rotate count is negative", + (code == LROTATE_EXPR) ? "left" : "right"); + else if (TREE_INT_CST_HIGH (op1) != 0 + || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) + >= TYPE_PRECISION (type0))) + warning ("%s rotate count >= width of type", + (code == LROTATE_EXPR) ? "left" : "right"); + } + /* Convert the shift-count to an integer, regardless of + size of value being shifted. */ + if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) + op1 = convert (integer_type_node, op1); + } + break; + + case EQ_EXPR: + case NE_EXPR: + result_type = bool_type_node; + converted = 1; + if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) + && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) + short_compare = 1; + else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) + { + register tree tt0 = TYPE_MAIN_VARIANT (TREE_TYPE (type0)); + register tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (type1)); + /* Anything compares with void *. void * compares with anything. + Otherwise, the targets must be the same. */ + if (tt0 != tt1 && TREE_CODE (tt0) == RECORD_TYPE + && TREE_CODE (tt1) == RECORD_TYPE) + { + tree base = common_base_type (tt0, tt1); + if (base == NULL_TREE) + cp_warning ("comparison of distinct object pointer types `%T' and `%T'", type0, type1); + else if (base == error_mark_node) + { + cp_error ("comparison of pointer types `%T' and `%T' requires conversion to ambiguous supertype", type0, type1); + return error_mark_node; + } + else + { + if (integer_zerop (op0)) + op0 = null_pointer_node; + else + op0 = convert_pointer_to (base, op0); + if (integer_zerop (op1)) + op1 = null_pointer_node; + else + op1 = convert_pointer_to (base, op1); + } + } + else if (comp_target_types (type0, type1, 1)) + ; + else if (tt0 == void_type_node) + { + if (pedantic && TREE_CODE (tt1) == FUNCTION_TYPE + && tree_int_cst_lt (TYPE_SIZE (type0), TYPE_SIZE (type1))) + pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); + } + else if (tt1 == void_type_node) + { + if (pedantic && TREE_CODE (tt0) == FUNCTION_TYPE + && tree_int_cst_lt (TYPE_SIZE (type1), TYPE_SIZE (type0))) + pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); + } + else if ((TYPE_SIZE (tt0) != 0) != (TYPE_SIZE (tt1) != 0)) + cp_pedwarn ("comparison of %scomplete and %scomplete pointers `%T' and `%T'", + TYPE_SIZE (tt0) == 0 ? "in" : "", + TYPE_SIZE (tt1) == 0 ? "in" : "", + type0, type1); + else + cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", + type0, type1); + } + else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST + && integer_zerop (op1)) + op1 = null_pointer_node; + else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST + && integer_zerop (op0)) + op0 = null_pointer_node; + else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) + { + error ("ANSI C++ forbids comparison between pointer and integer"); + op1 = convert (TREE_TYPE (op0), op1); + } + else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) + { + error ("ANSI C++ forbids comparison between pointer and integer"); + op0 = convert (TREE_TYPE (op1), op0); + } + else if (TYPE_PTRMEMFUNC_P (type0) && TREE_CODE (op1) == INTEGER_CST + && integer_zerop (op1)) + { + op0 = build_component_ref (op0, index_identifier, 0, 0); + op1 = integer_zero_node; + } + else if (TYPE_PTRMEMFUNC_P (type1) && TREE_CODE (op0) == INTEGER_CST + && integer_zerop (op0)) + { + op0 = build_component_ref (op1, index_identifier, 0, 0); + op1 = integer_zero_node; + } + else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1) + && (TYPE_PTRMEMFUNC_FN_TYPE (type0) + == TYPE_PTRMEMFUNC_FN_TYPE (type1))) + { + /* The code we generate for the test is: + + (op0.index == op1.index + && ((op1.index != -1 && op0.delta2 == op1.delta2) + || op0.pfn == op1.pfn)) */ + + tree index0 = build_component_ref (op0, index_identifier, 0, 0); + tree index1 = save_expr (build_component_ref (op1, index_identifier, 0, 0)); + tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); + tree pfn1 = PFN_FROM_PTRMEMFUNC (op1); + tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); + tree delta21 = DELTA2_FROM_PTRMEMFUNC (op1); + tree e1, e2, e3; + tree integer_neg_one_node + = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); + e1 = build_binary_op (EQ_EXPR, index0, index1, 1); + e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); + e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); + e3 = build_binary_op (EQ_EXPR, pfn0, pfn1, 1); + e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); + e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); + if (code == EQ_EXPR) + return e2; + return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); + } + else if (TYPE_PTRMEMFUNC_P (type0) + && TYPE_PTRMEMFUNC_FN_TYPE (type0) == type1) + { + tree index0 = build_component_ref (op0, index_identifier, 0, 0); + tree index1; + tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); + tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); + tree delta21 = integer_zero_node; + tree e1, e2, e3; + tree integer_neg_one_node + = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); + if (TREE_CODE (TREE_OPERAND (op1, 0)) == FUNCTION_DECL + && DECL_VINDEX (TREE_OPERAND (op1, 0))) + { + /* Map everything down one to make room for the null pointer to member. */ + index1 = size_binop (PLUS_EXPR, + DECL_VINDEX (TREE_OPERAND (op1, 0)), + integer_one_node); + op1 = integer_zero_node; + delta21 = CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE (TREE_TYPE (type1))); + delta21 = DECL_FIELD_BITPOS (delta21); + delta21 = size_binop (FLOOR_DIV_EXPR, delta21, size_int (BITS_PER_UNIT)); + } + else + index1 = integer_neg_one_node; + { + tree nop1 = build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type0), op1); + TREE_CONSTANT (nop1) = TREE_CONSTANT (op1); + op1 = nop1; + } + e1 = build_binary_op (EQ_EXPR, index0, index1, 1); + e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); + e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); + e3 = build_binary_op (EQ_EXPR, pfn0, op1, 1); + e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); + e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); + if (code == EQ_EXPR) + return e2; + return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); + } + else if (TYPE_PTRMEMFUNC_P (type1) + && TYPE_PTRMEMFUNC_FN_TYPE (type1) == type0) + { + return build_binary_op (code, op1, op0, 1); + } + else + /* If args are not valid, clear out RESULT_TYPE + to cause an error message later. */ + result_type = 0; + break; + + case MAX_EXPR: + case MIN_EXPR: + if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) + && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) + shorten = 1; + else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) + { + if (! comp_target_types (type0, type1, 1)) + cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", + type0, type1); + else if ((TYPE_SIZE (TREE_TYPE (type0)) != 0) + != (TYPE_SIZE (TREE_TYPE (type1)) != 0)) + cp_pedwarn ("comparison of %scomplete and %scomplete pointers", + TYPE_SIZE (TREE_TYPE (type0)) == 0 ? "in" : "", + TYPE_SIZE (TREE_TYPE (type1)) == 0 ? "in" : "", + type0, type1); + else if (pedantic + && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids ordered comparisons of pointers to functions"); + result_type = common_type (type0, type1); + } + break; + + case LE_EXPR: + case GE_EXPR: + case LT_EXPR: + case GT_EXPR: + if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) + && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) + short_compare = 1; + else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) + { + if (! comp_target_types (type0, type1, 1)) + cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", + type0, type1); + else if ((TYPE_SIZE (TREE_TYPE (type0)) != 0) + != (TYPE_SIZE (TREE_TYPE (type1)) != 0)) + cp_pedwarn ("comparison of %scomplete and %scomplete pointers", + TYPE_SIZE (TREE_TYPE (type0)) == 0 ? "in" : "", + TYPE_SIZE (TREE_TYPE (type1)) == 0 ? "in" : "", + type0, type1); + else if (pedantic + && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids ordered comparisons of pointers to functions"); + } + else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST + && integer_zerop (op1)) + { + op1 = null_pointer_node; + if (pedantic) + pedwarn ("ordered comparison of pointer with integer zero"); + } + else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST + && integer_zerop (op0)) + { + op0 = null_pointer_node; + if (pedantic) + pedwarn ("ANSI C++ forbids ordered comparison of pointer with integer zero"); + } + else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) + { + if (pedantic) + pedwarn ("ANSI C++ forbids comparison between pointer and integer"); + else if (! flag_traditional) + warning ("comparison between pointer and integer"); + op1 = convert (TREE_TYPE (op0), op1); + } + else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) + { + if (pedantic) + pedwarn ("ANSI C++ forbids comparison between pointer and integer"); + else if (! flag_traditional) + warning ("comparison between pointer and integer"); + op0 = convert (TREE_TYPE (op1), op0); + } + result_type = bool_type_node; + converted = 1; + break; + } + + if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) + && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) + { + if (shorten || common || short_compare) + result_type = common_type (type0, type1); + + /* For certain operations (which identify themselves by shorten != 0) + if both args were extended from the same smaller type, + do the arithmetic in that type and then extend. + + shorten !=0 and !=1 indicates a bitwise operation. + For them, this optimization is safe only if + both args are zero-extended or both are sign-extended. + Otherwise, we might change the result. + Eg, (short)-1 | (unsigned short)-1 is (int)-1 + but calculated in (unsigned short) it would be (unsigned short)-1. */ + + if (shorten) + { + int unsigned0, unsigned1; + tree arg0 = get_narrower (op0, &unsigned0); + tree arg1 = get_narrower (op1, &unsigned1); + /* UNS is 1 if the operation to be done is an unsigned one. */ + int uns = TREE_UNSIGNED (result_type); + tree type; + + final_type = result_type; + + /* Handle the case that OP0 does not *contain* a conversion + but it *requires* conversion to FINAL_TYPE. */ + + if (op0 == arg0 && TREE_TYPE (op0) != final_type) + unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); + if (op1 == arg1 && TREE_TYPE (op1) != final_type) + unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); + + /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ + + /* For bitwise operations, signedness of nominal type + does not matter. Consider only how operands were extended. */ + if (shorten == -1) + uns = unsigned0; + + /* Note that in all three cases below we refrain from optimizing + an unsigned operation on sign-extended args. + That would not be valid. */ + + /* Both args variable: if both extended in same way + from same width, do it in that width. + Do it unsigned if args were zero-extended. */ + if ((TYPE_PRECISION (TREE_TYPE (arg0)) + < TYPE_PRECISION (result_type)) + && (TYPE_PRECISION (TREE_TYPE (arg1)) + == TYPE_PRECISION (TREE_TYPE (arg0))) + && unsigned0 == unsigned1 + && (unsigned0 || !uns)) + result_type + = signed_or_unsigned_type (unsigned0, + common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); + else if (TREE_CODE (arg0) == INTEGER_CST + && (unsigned1 || !uns) + && (TYPE_PRECISION (TREE_TYPE (arg1)) + < TYPE_PRECISION (result_type)) + && (type = signed_or_unsigned_type (unsigned1, + TREE_TYPE (arg1)), + int_fits_type_p (arg0, type))) + result_type = type; + else if (TREE_CODE (arg1) == INTEGER_CST + && (unsigned0 || !uns) + && (TYPE_PRECISION (TREE_TYPE (arg0)) + < TYPE_PRECISION (result_type)) + && (type = signed_or_unsigned_type (unsigned0, + TREE_TYPE (arg0)), + int_fits_type_p (arg1, type))) + result_type = type; + } + + /* Shifts can be shortened if shifting right. */ + + if (short_shift) + { + int unsigned_arg; + tree arg0 = get_narrower (op0, &unsigned_arg); + + final_type = result_type; + + if (arg0 == op0 && final_type == TREE_TYPE (op0)) + unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); + + if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) + /* If arg is sign-extended and then unsigned-shifted, + we can simulate this with a signed shift in arg's type + only if the extended result is at least twice as wide + as the arg. Otherwise, the shift could use up all the + ones made by sign-extension and bring in zeros. + We can't optimize that case at all, but in most machines + it never happens because available widths are 2**N. */ + && (!TREE_UNSIGNED (final_type) + || unsigned_arg + || ((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0)) + <= TYPE_PRECISION (result_type)))) + { + /* Do an unsigned shift if the operand was zero-extended. */ + result_type + = signed_or_unsigned_type (unsigned_arg, + TREE_TYPE (arg0)); + /* Convert value-to-be-shifted to that type. */ + if (TREE_TYPE (op0) != result_type) + op0 = convert (result_type, op0); + converted = 1; + } + } + + /* Comparison operations are shortened too but differently. + They identify themselves by setting short_compare = 1. */ + + if (short_compare) + { + /* Don't write &op0, etc., because that would prevent op0 + from being kept in a register. + Instead, make copies of the our local variables and + pass the copies by reference, then copy them back afterward. */ + tree xop0 = op0, xop1 = op1, xresult_type = result_type; + enum tree_code xresultcode = resultcode; + tree val + = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); + if (val != 0) + return convert (bool_type_node, val); + op0 = xop0, op1 = xop1, result_type = bool_type_node; + resultcode = xresultcode; + } + + if (short_compare && extra_warnings) + { + int unsignedp0, unsignedp1; + tree primop0 = get_narrower (op0, &unsignedp0); + tree primop1 = get_narrower (op1, &unsignedp1); + + /* Warn if signed and unsigned are being compared in a size larger + than their original size, as this will always fail. */ + + if (unsignedp0 != unsignedp1 + && (TYPE_PRECISION (TREE_TYPE (primop0)) + < TYPE_PRECISION (result_type)) + && (TYPE_PRECISION (TREE_TYPE (primop1)) + < TYPE_PRECISION (result_type))) + warning ("comparison between promoted unsigned and signed"); + + /* Warn if two unsigned values are being compared in a size + larger than their original size, and one (and only one) is the + result of a `~' operator. This comparison will always fail. + + Also warn if one operand is a constant, and the constant does not + have all bits set that are set in the ~ operand when it is + extended. */ + + else if (TREE_CODE (primop0) == BIT_NOT_EXPR + ^ TREE_CODE (primop1) == BIT_NOT_EXPR) + { + if (TREE_CODE (primop0) == BIT_NOT_EXPR) + primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); + if (TREE_CODE (primop1) == BIT_NOT_EXPR) + primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); + + if (TREE_CODE (primop0) == INTEGER_CST + || TREE_CODE (primop1) == INTEGER_CST) + { + tree primop; + HOST_WIDE_INT constant, mask; + int unsignedp; + unsigned bits; + + if (TREE_CODE (primop0) == INTEGER_CST) + { + primop = primop1; + unsignedp = unsignedp1; + constant = TREE_INT_CST_LOW (primop0); + } + else + { + primop = primop0; + unsignedp = unsignedp0; + constant = TREE_INT_CST_LOW (primop1); + } + + bits = TYPE_PRECISION (TREE_TYPE (primop)); + if (bits < TYPE_PRECISION (result_type) + && bits < HOST_BITS_PER_LONG && unsignedp) + { + mask = (~ (HOST_WIDE_INT) 0) << bits; + if ((mask & constant) != mask) + warning ("comparison of promoted ~unsigned with constant"); + } + } + else if (unsignedp0 && unsignedp1 + && (TYPE_PRECISION (TREE_TYPE (primop0)) + < TYPE_PRECISION (result_type)) + && (TYPE_PRECISION (TREE_TYPE (primop1)) + < TYPE_PRECISION (result_type))) + warning ("comparison of promoted ~unsigned with unsigned"); + } + } + } + + /* At this point, RESULT_TYPE must be nonzero to avoid an error message. + If CONVERTED is zero, both args will be converted to type RESULT_TYPE. + Then the expression will be built. + It will be given type FINAL_TYPE if that is nonzero; + otherwise, it will be given type RESULT_TYPE. */ + + if (!result_type) + { + binary_op_error (error_code); + return error_mark_node; + } + + if (! converted) + { + if (TREE_TYPE (op0) != result_type) + op0 = convert (result_type, op0); + if (TREE_TYPE (op1) != result_type) + op1 = convert (result_type, op1); + } + + { + register tree result = build (resultcode, result_type, op0, op1); + register tree folded; + + folded = fold (result); + if (folded == result) + TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); + if (final_type != 0) + return convert (final_type, folded); + return folded; + } +} + +/* Return a tree for the sum or difference (RESULTCODE says which) + of pointer PTROP and integer INTOP. */ + +static tree +pointer_int_sum (resultcode, ptrop, intop) + enum tree_code resultcode; + register tree ptrop, intop; +{ + tree size_exp; + + register tree result; + register tree folded = fold (intop); + + /* The result is a pointer of the same type that is being added. */ + + register tree result_type = TREE_TYPE (ptrop); + + if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic"); + size_exp = integer_one_node; + } + else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic"); + size_exp = integer_one_node; + } + else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) + { + if (pedantic || warn_pointer_arith) + pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic"); + size_exp = integer_one_node; + } + else if (TREE_CODE (TREE_TYPE (result_type)) == OFFSET_TYPE) + { + if (pedantic) + pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic"); + size_exp = integer_one_node; + } + else + size_exp = size_in_bytes (TREE_TYPE (result_type)); + + /* Needed to make OOPS V2R3 work. */ + intop = folded; + if (TREE_CODE (intop) == INTEGER_CST + && TREE_INT_CST_LOW (intop) == 0 + && TREE_INT_CST_HIGH (intop) == 0) + return ptrop; + + /* If what we are about to multiply by the size of the elements + contains a constant term, apply distributive law + and multiply that constant term separately. + This helps produce common subexpressions. */ + + if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) + && ! TREE_CONSTANT (intop) + && TREE_CONSTANT (TREE_OPERAND (intop, 1)) + && TREE_CONSTANT (size_exp)) + { + enum tree_code subcode = resultcode; + if (TREE_CODE (intop) == MINUS_EXPR) + subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); + ptrop = build_binary_op (subcode, ptrop, TREE_OPERAND (intop, 1), 1); + intop = TREE_OPERAND (intop, 0); + } + + /* Convert the integer argument to a type the same size as a pointer + so the multiply won't overflow spuriously. */ + + if (TYPE_PRECISION (TREE_TYPE (intop)) != POINTER_SIZE) + intop = convert (type_for_size (POINTER_SIZE, 0), intop); + + /* Replace the integer argument with a suitable product by the object size. + Do this multiplication as signed, then convert to the appropriate + pointer type (actually unsigned integral). */ + + intop = convert (result_type, + build_binary_op (MULT_EXPR, intop, + convert (TREE_TYPE (intop), size_exp), 1)); + + /* Create the sum or difference. */ + + result = build (resultcode, result_type, ptrop, intop); + + folded = fold (result); + if (folded == result) + TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); + return folded; +} + +/* Return a tree for the difference of pointers OP0 and OP1. + The resulting tree has type int. */ + +static tree +pointer_diff (op0, op1) + register tree op0, op1; +{ + register tree result, folded; + tree restype = ptrdiff_type_node; + tree target_type = TREE_TYPE (TREE_TYPE (op0)); + + if (pedantic) + { + if (TREE_CODE (target_type) == VOID_TYPE) + pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction"); + if (TREE_CODE (target_type) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids using pointer to a function in subtraction"); + if (TREE_CODE (target_type) == METHOD_TYPE) + pedwarn ("ANSI C++ forbids using pointer to a method in subtraction"); + if (TREE_CODE (target_type) == OFFSET_TYPE) + pedwarn ("ANSI C++ forbids using pointer to a member in subtraction"); + } + + /* First do the subtraction as integers; + then drop through to build the divide operator. */ + + op0 = build_binary_op (MINUS_EXPR, + convert (restype, op0), convert (restype, op1), 1); + + /* This generates an error if op1 is a pointer to an incomplete type. */ + if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) + error ("arithmetic on pointer to an incomplete type"); + + op1 = ((TREE_CODE (target_type) == VOID_TYPE + || TREE_CODE (target_type) == FUNCTION_TYPE + || TREE_CODE (target_type) == METHOD_TYPE + || TREE_CODE (target_type) == OFFSET_TYPE) + ? integer_one_node + : size_in_bytes (target_type)); + + /* Do the division. */ + + result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); + + folded = fold (result); + if (folded == result) + TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); + return folded; +} + +/* Handle the case of taking the address of a COMPONENT_REF. + Called by `build_unary_op' and `build_up_reference'. + + ARG is the COMPONENT_REF whose address we want. + ARGTYPE is the pointer type that this address should have. + MSG is an error message to print if this COMPONENT_REF is not + addressable (such as a bitfield). */ + +tree +build_component_addr (arg, argtype, msg) + tree arg, argtype; + char *msg; +{ + tree field = TREE_OPERAND (arg, 1); + tree basetype = decl_type_context (field); + tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); + + if (DECL_BIT_FIELD (field)) + { + error (msg, IDENTIFIER_POINTER (DECL_NAME (field))); + return error_mark_node; + } + + if (flag_gc) + cp_warning ("address of `%T::%D' taken", basetype, field); + + if (TREE_CODE (field) == FIELD_DECL + && TYPE_USES_COMPLEX_INHERITANCE (basetype)) + { + /* Can't convert directly to ARGTYPE, since that + may have the same pointer type as one of our + baseclasses. */ + rval = build1 (NOP_EXPR, argtype, + convert_pointer_to (basetype, rval)); + TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0)); + } + else + /* This conversion is harmless. */ + rval = convert (argtype, rval); + + if (! integer_zerop (DECL_FIELD_BITPOS (field))) + { + tree offset = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), + size_int (BITS_PER_UNIT)); + int flag = TREE_CONSTANT (rval); + rval = fold (build (PLUS_EXPR, argtype, + rval, convert (argtype, offset))); + TREE_CONSTANT (rval) = flag; + } + return rval; +} + +/* Construct and perhaps optimize a tree representation + for a unary operation. CODE, a tree_code, specifies the operation + and XARG is the operand. */ + +tree +build_x_unary_op (code, xarg) + enum tree_code code; + tree xarg; +{ + /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an + error message. */ + if (code != ADDR_EXPR || TREE_CODE (TREE_TYPE (xarg)) != RECORD_TYPE + || TYPE_SIZE (TREE_TYPE (xarg))) + { + tree rval = build_opfncall (code, LOOKUP_SPECULATIVELY, xarg, + NULL_TREE, NULL_TREE); + if (rval) + return build_opfncall (code, LOOKUP_NORMAL, xarg, + NULL_TREE, NULL_TREE); + } + return build_unary_op (code, xarg, 0); +} + +/* Just like truthvalue_conversion, but we want a BOOLEAN_TYPE */ +tree +bool_truthvalue_conversion (expr) + tree expr; +{ + /* We really want to preform the optimizations in truthvalue_conversion + but, not this way. */ + /* expr = truthvalue_conversion (expr); */ + return convert (bool_type_node, expr); +} + +/* C++: Must handle pointers to members. + + Perhaps type instantiation should be extended to handle conversion + from aggregates to types we don't yet know we want? (Or are those + cases typically errors which should be reported?) + + NOCONVERT nonzero suppresses the default promotions + (such as from short to int). */ +tree +build_unary_op (code, xarg, noconvert) + enum tree_code code; + tree xarg; + int noconvert; +{ + /* No default_conversion here. It causes trouble for ADDR_EXPR. */ + register tree arg = xarg; + register tree argtype = 0; + register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); + char *errstring = NULL; + tree val; + int isaggrtype; + + if (typecode == ERROR_MARK) + return error_mark_node; + + if (typecode == REFERENCE_TYPE && code != ADDR_EXPR && ! noconvert) + { + arg = convert_from_reference (arg); + typecode = TREE_CODE (TREE_TYPE (arg)); + } + + if (typecode == ENUMERAL_TYPE) + typecode = INTEGER_TYPE; + + isaggrtype = IS_AGGR_TYPE_CODE (typecode); + + switch (code) + { + case CONVERT_EXPR: + /* This is used for unary plus, because a CONVERT_EXPR + is enough to prevent anybody from looking inside for + associativity, but won't generate any code. */ + if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE)) + errstring = "wrong type argument to unary plus"; + else if (!noconvert) + arg = default_conversion (arg); + break; + + case NEGATE_EXPR: + if (isaggrtype) + { + if (!noconvert) + arg = default_conversion (arg); + else + { + cp_error ("type conversion for type `%T' not allowed", + TREE_TYPE (arg)); + return error_mark_node; + } + typecode = TREE_CODE (TREE_TYPE (arg)); + noconvert = 1; + } + + if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE)) + errstring = "wrong type argument to unary minus"; + else if (!noconvert) + arg = default_conversion (arg); + break; + + case BIT_NOT_EXPR: + if (isaggrtype) + { + if (!noconvert) + arg = default_conversion (arg); + else + { + cp_error ("type conversion for type `%T' not allowed", + TREE_TYPE (arg)); + return error_mark_node; + } + typecode = TREE_CODE (TREE_TYPE (arg)); + noconvert = 1; + } + + if (typecode != INTEGER_TYPE) + errstring = "wrong type argument to bit-complement"; + else if (!noconvert) + arg = default_conversion (arg); + break; + + case ABS_EXPR: + if (isaggrtype) + { + if (!noconvert) + arg = default_conversion (arg); + else + { + cp_error ("type conversion for type `%T' not allowed", + TREE_TYPE (arg)); + return error_mark_node; + } + typecode = TREE_CODE (TREE_TYPE (arg)); + noconvert = 1; + } + + if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE)) + errstring = "wrong type argument to abs"; + else if (!noconvert) + arg = default_conversion (arg); + break; + + case TRUTH_NOT_EXPR: + arg = bool_truthvalue_conversion (arg); + val = invert_truthvalue (arg); + if (arg != error_mark_node) + return val; + errstring = "in argument to unary !"; + break; + + case NOP_EXPR: + break; + + case PREINCREMENT_EXPR: + case POSTINCREMENT_EXPR: + case PREDECREMENT_EXPR: + case POSTDECREMENT_EXPR: + /* Handle complex lvalues (when permitted) + by reduction to simpler cases. */ + + val = unary_complex_lvalue (code, arg); + if (val != 0) + return val; + + /* Report invalid types. */ + + if (isaggrtype) + { + arg = default_conversion (arg); + typecode = TREE_CODE (TREE_TYPE (arg)); + } + + if (typecode != POINTER_TYPE + && typecode != INTEGER_TYPE && typecode != REAL_TYPE) + { + if (code == PREINCREMENT_EXPR) + errstring ="no pre-increment operator for type"; + else if (code == POSTINCREMENT_EXPR) + errstring ="no post-increment operator for type"; + else if (code == PREDECREMENT_EXPR) + errstring ="no pre-decrement operator for type"; + else + errstring ="no post-decrement operator for type"; + break; + } + + /* Report something read-only. */ + + if (TYPE_READONLY (TREE_TYPE (arg)) + || TREE_READONLY (arg)) + readonly_error (arg, ((code == PREINCREMENT_EXPR + || code == POSTINCREMENT_EXPR) + ? "increment" : "decrement"), + 0); + + { + register tree inc; + tree result_type = TREE_TYPE (arg); + + arg = get_unwidened (arg, 0); + argtype = TREE_TYPE (arg); + + /* ARM $5.2.5 last annotation says this should be forbidden. */ + if (TREE_CODE (argtype) == ENUMERAL_TYPE) + pedwarn ("ANSI C++ forbids %sing an enum", + (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) + ? "increment" : "decrement"); + + /* Compute the increment. */ + + if (typecode == POINTER_TYPE) + { + enum tree_code tmp = TREE_CODE (TREE_TYPE (argtype)); + if (TYPE_SIZE (TREE_TYPE (argtype)) == 0) + cp_error ("cannot %s a pointer to incomplete type `%T'", + ((code == PREINCREMENT_EXPR + || code == POSTINCREMENT_EXPR) + ? "increment" : "decrement"), TREE_TYPE (argtype)); + else if (tmp == FUNCTION_TYPE || tmp == METHOD_TYPE + || tmp == VOID_TYPE || tmp == OFFSET_TYPE) + cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'", + ((code == PREINCREMENT_EXPR + || code == POSTINCREMENT_EXPR) + ? "increment" : "decrement"), argtype); + inc = c_sizeof_nowarn (TREE_TYPE (argtype)); + } + else + inc = integer_one_node; + + inc = convert (argtype, inc); + + /* Handle incrementing a cast-expression. */ + + switch (TREE_CODE (arg)) + { + case NOP_EXPR: + case CONVERT_EXPR: + case FLOAT_EXPR: + case FIX_TRUNC_EXPR: + case FIX_FLOOR_EXPR: + case FIX_ROUND_EXPR: + case FIX_CEIL_EXPR: + { + tree incremented, modify, value; + if (! lvalue_p (arg) && pedantic) + pedwarn ("cast to non-reference type used as lvalue"); + arg = stabilize_reference (arg); + if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) + value = arg; + else + value = save_expr (arg); + incremented = build (((code == PREINCREMENT_EXPR + || code == POSTINCREMENT_EXPR) + ? PLUS_EXPR : MINUS_EXPR), + argtype, value, inc); + TREE_SIDE_EFFECTS (incremented) = 1; + modify = build_modify_expr (arg, NOP_EXPR, incremented); + return build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); + } + } + + if (TREE_CODE (arg) == OFFSET_REF) + arg = resolve_offset_ref (arg); + + /* Complain about anything else that is not a true lvalue. */ + if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR + || code == POSTINCREMENT_EXPR) + ? "increment" : "decrement"))) + return error_mark_node; + + val = build (code, TREE_TYPE (arg), arg, inc); + TREE_SIDE_EFFECTS (val) = 1; + return convert (result_type, val); + } + + case ADDR_EXPR: + /* Note that this operation never does default_conversion + regardless of NOCONVERT. */ + + if (typecode == REFERENCE_TYPE) + { + arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); + TREE_REFERENCE_EXPR (arg) = 1; + return arg; + } + else if (pedantic + && TREE_CODE (arg) == FUNCTION_DECL + && DECL_NAME (arg) + && DECL_CONTEXT (arg) == NULL_TREE + && IDENTIFIER_LENGTH (DECL_NAME (arg)) == 4 + && IDENTIFIER_POINTER (DECL_NAME (arg))[0] == 'm' + && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (arg)), "main")) + /* ARM $3.4 */ + pedwarn ("taking address of function `main'"); + + /* Let &* cancel out to simplify resulting code. */ + if (TREE_CODE (arg) == INDIRECT_REF) + { + /* We don't need to have `current_class_decl' wrapped in a + NON_LVALUE_EXPR node. */ + if (arg == C_C_D) + return current_class_decl; + + /* Keep `default_conversion' from converting if + ARG is of REFERENCE_TYPE. */ + arg = TREE_OPERAND (arg, 0); + if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) + { + if (TREE_CODE (arg) == VAR_DECL && DECL_INITIAL (arg) + && !TREE_SIDE_EFFECTS (DECL_INITIAL (arg))) + arg = DECL_INITIAL (arg); + arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); + TREE_REFERENCE_EXPR (arg) = 1; + TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); + } + else if (lvalue_p (arg)) + /* Don't let this be an lvalue. */ + return non_lvalue (arg); + return arg; + } + + /* For &x[y], return x+y */ + if (TREE_CODE (arg) == ARRAY_REF) + { + if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) + return error_mark_node; + return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), + TREE_OPERAND (arg, 1), 1); + } + + /* For &(++foo), we are really taking the address of the variable + being acted upon by the increment/decrement operator. ARM $5.3.1 + However, according to ARM $5.2.5, we don't allow postfix ++ and + --, since the prefix operators return lvalues, but the postfix + operators do not. */ + if (TREE_CODE (arg) == PREINCREMENT_EXPR + || TREE_CODE (arg) == PREDECREMENT_EXPR) + arg = TREE_OPERAND (arg, 0); + + /* Uninstantiated types are all functions. Taking the + address of a function is a no-op, so just return the + argument. */ + + if (TREE_CODE (arg) == IDENTIFIER_NODE + && IDENTIFIER_OPNAME_P (arg)) + { + my_friendly_abort (117); + /* We don't know the type yet, so just work around the problem. + We know that this will resolve to an lvalue. */ + return build1 (ADDR_EXPR, unknown_type_node, arg); + } + + if (TREE_CODE (arg) == TREE_LIST) + { + /* Look at methods with only this name. */ + if (TREE_CODE (TREE_VALUE (arg)) == FUNCTION_DECL) + { + tree targ = TREE_VALUE (arg); + + /* If this function is unique, or it is a unique + constructor, we can take its address easily. */ + if (DECL_CHAIN (targ) == NULL_TREE + || (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (targ)) + && DECL_CHAIN (DECL_CHAIN (targ)) == NULL_TREE)) + { + if (DECL_CHAIN (targ)) + targ = DECL_CHAIN (targ); + if (DECL_CLASS_CONTEXT (targ)) + targ = build (OFFSET_REF, TREE_TYPE (targ), C_C_D, targ); + + val = unary_complex_lvalue (ADDR_EXPR, targ); + if (val) + return val; + } + + /* This possible setting of TREE_CONSTANT is what makes it possible + with an initializer list to emit the entire thing in the data + section, rather than a run-time initialization. */ + arg = build1 (ADDR_EXPR, unknown_type_node, arg); + if (staticp (targ)) + TREE_CONSTANT (arg) = 1; + return arg; + } + if (TREE_CHAIN (arg) == NULL_TREE + && TREE_CODE (TREE_VALUE (arg)) == TREE_LIST + && DECL_CHAIN (TREE_VALUE (TREE_VALUE (arg))) == NULL_TREE) + { + /* Unique overloaded member function. */ + return build_unary_op (ADDR_EXPR, TREE_VALUE (TREE_VALUE (arg)), 0); + } + return build1 (ADDR_EXPR, unknown_type_node, arg); + } + + /* Handle complex lvalues (when permitted) + by reduction to simpler cases. */ + val = unary_complex_lvalue (code, arg); + if (val != 0) + return val; + + switch (TREE_CODE (arg)) + { + case NOP_EXPR: + case CONVERT_EXPR: + case FLOAT_EXPR: + case FIX_TRUNC_EXPR: + case FIX_FLOOR_EXPR: + case FIX_ROUND_EXPR: + case FIX_CEIL_EXPR: + if (! lvalue_p (arg) && pedantic) + pedwarn ("taking the address of a cast to non-reference type"); + } + + /* Allow the address of a constructor if all the elements + are constant. */ + if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) + ; + /* Anything not already handled and not a true memory reference + is an error. */ + else if (typecode != FUNCTION_TYPE + && typecode != METHOD_TYPE + && !lvalue_or_else (arg, "unary `&'")) + return error_mark_node; + + /* Ordinary case; arg is a COMPONENT_REF or a decl. */ + argtype = TREE_TYPE (arg); + /* If the lvalue is const or volatile, + merge that into the type that the address will point to. */ + if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' + || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') + { + if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) + argtype = c_build_type_variant (argtype, + TREE_READONLY (arg), + TREE_THIS_VOLATILE (arg)); + } + + argtype = build_pointer_type (argtype); + + if (mark_addressable (arg) == 0) + return error_mark_node; + + { + tree addr; + + if (TREE_CODE (arg) == COMPONENT_REF) + addr = build_component_addr (arg, argtype, + "attempt to take address of bit-field structure member `%s'"); + else + addr = build1 (code, argtype, arg); + + /* Address of a static or external variable or + function counts as a constant */ + if (staticp (arg)) + TREE_CONSTANT (addr) = 1; + return addr; + } + } + + if (!errstring) + { + if (argtype == 0) + argtype = TREE_TYPE (arg); + return fold (build1 (code, argtype, arg)); + } + + error (errstring); + return error_mark_node; +} + +/* If CONVERSIONS is a conversion expression or a nested sequence of such, + convert ARG with the same conversions in the same order + and return the result. */ + +static tree +convert_sequence (conversions, arg) + tree conversions; + tree arg; +{ + switch (TREE_CODE (conversions)) + { + case NOP_EXPR: + case CONVERT_EXPR: + case FLOAT_EXPR: + case FIX_TRUNC_EXPR: + case FIX_FLOOR_EXPR: + case FIX_ROUND_EXPR: + case FIX_CEIL_EXPR: + return convert (TREE_TYPE (conversions), + convert_sequence (TREE_OPERAND (conversions, 0), + arg)); + + default: + return arg; + } +} + +/* Apply unary lvalue-demanding operator CODE to the expression ARG + for certain kinds of expressions which are not really lvalues + but which we can accept as lvalues. + + If ARG is not a kind of expression we can handle, return zero. */ + +tree +unary_complex_lvalue (code, arg) + enum tree_code code; + tree arg; +{ + /* Handle (a, b) used as an "lvalue". */ + if (TREE_CODE (arg) == COMPOUND_EXPR) + { + tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); + return build (COMPOUND_EXPR, TREE_TYPE (real_result), + TREE_OPERAND (arg, 0), real_result); + } + + /* Handle (a ? b : c) used as an "lvalue". */ + if (TREE_CODE (arg) == COND_EXPR) + return rationalize_conditional_expr (code, arg); + + if (TREE_CODE (arg) == MODIFY_EXPR) + return unary_complex_lvalue + (code, build (COMPOUND_EXPR, TREE_TYPE (TREE_OPERAND (arg, 0)), + arg, TREE_OPERAND (arg, 0))); + + if (code != ADDR_EXPR) + return 0; + + /* Handle (a = b) used as an "lvalue" for `&'. */ + if (TREE_CODE (arg) == MODIFY_EXPR + || TREE_CODE (arg) == INIT_EXPR) + { + tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); + return build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result); + } + + if (TREE_CODE (arg) == WITH_CLEANUP_EXPR) + { + tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); + real_result = build (WITH_CLEANUP_EXPR, TREE_TYPE (real_result), + real_result, 0, TREE_OPERAND (arg, 2)); + return real_result; + } + + if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE + || TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) + { + /* The representation of something of type OFFSET_TYPE + is really the representation of a pointer to it. + Here give the representation its true type. */ + tree t; + tree offset; + + my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313); + + if (TREE_CODE (arg) != OFFSET_REF) + return 0; + + t = TREE_OPERAND (arg, 1); + + if (TREE_CODE (t) == FUNCTION_DECL) /* Check all this code for right semantics. */ + return build_unary_op (ADDR_EXPR, t, 0); + if (TREE_CODE (t) == VAR_DECL) + return build_unary_op (ADDR_EXPR, t, 0); + else + { + /* Can't build a pointer to member if the member must + go through virtual base classes. */ + if (virtual_member (DECL_FIELD_CONTEXT (t), + CLASSTYPE_VBASECLASSES (TREE_TYPE (TREE_OPERAND (arg, 0))))) + { + sorry ("pointer to member via virtual baseclass"); + return error_mark_node; + } + + if (TREE_OPERAND (arg, 0) + && (TREE_CODE (TREE_OPERAND (arg, 0)) != NOP_EXPR + || TREE_OPERAND (TREE_OPERAND (arg, 0), 0) != error_mark_node)) + { + /* Don't know if this should return address to just + _DECL, or actual address resolved in this expression. */ + sorry ("address of bound pointer-to-member expression"); + return error_mark_node; + } + + return convert (build_pointer_type (TREE_TYPE (arg)), + size_binop (EASY_DIV_EXPR, + DECL_FIELD_BITPOS (t), + size_int (BITS_PER_UNIT))); + } + } + + if (TREE_CODE (arg) == OFFSET_REF) + { + tree left = TREE_OPERAND (arg, 0), left_addr; + tree right_addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 1), 0); + + if (left == 0) + if (current_class_decl) + left_addr = current_class_decl; + else + { + error ("no `this' for pointer to member"); + return error_mark_node; + } + else + left_addr = build_unary_op (ADDR_EXPR, left, 0); + + return build (PLUS_EXPR, build_pointer_type (TREE_TYPE (arg)), + build1 (NOP_EXPR, integer_type_node, left_addr), + build1 (NOP_EXPR, integer_type_node, right_addr)); + } + + /* We permit compiler to make function calls returning + objects of aggregate type look like lvalues. */ + { + tree targ = arg; + + if (TREE_CODE (targ) == SAVE_EXPR) + targ = TREE_OPERAND (targ, 0); + + if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ))) + { + if (TREE_CODE (arg) == SAVE_EXPR) + targ = arg; + else + targ = build_cplus_new (TREE_TYPE (arg), arg, 1); + return build1 (ADDR_EXPR, TYPE_POINTER_TO (TREE_TYPE (arg)), targ); + } + + if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) + return build (SAVE_EXPR, TYPE_POINTER_TO (TREE_TYPE (arg)), + TREE_OPERAND (targ, 0), current_function_decl, NULL); + + /* We shouldn't wrap WITH_CLEANUP_EXPRs inside of SAVE_EXPRs, but in case + we do, here's how to handle it. */ + if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == WITH_CLEANUP_EXPR) + { +#if 0 + /* Not really a bug, but something to turn on when testing. */ + compiler_error ("WITH_CLEANUP_EXPR wrapped in SAVE_EXPR"); +#endif + return unary_complex_lvalue (ADDR_EXPR, targ); + } + } + + /* Don't let anything else be handled specially. */ + return 0; +} + +/* Mark EXP saying that we need to be able to take the + address of it; it should not be allocated in a register. + Value is 1 if successful. + + C++: we do not allow `current_class_decl' to be addressable. */ + +int +mark_addressable (exp) + tree exp; +{ + register tree x = exp; + + if (TREE_ADDRESSABLE (x) == 1) + return 1; + + while (1) + switch (TREE_CODE (x)) + { + case ADDR_EXPR: + case COMPONENT_REF: + case ARRAY_REF: + x = TREE_OPERAND (x, 0); + break; + + case PARM_DECL: + if (x == current_class_decl) + { + error ("address of `this' not available"); + TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */ + put_var_into_stack (x); + return 1; + } + case VAR_DECL: + if (TREE_STATIC (x) + && TREE_READONLY (x) + && DECL_RTL (x) != 0 + && ! decl_in_memory_p (x)) + { + /* We thought this would make a good constant variable, + but we were wrong. */ + push_obstacks_nochange (); + end_temporary_allocation (); + + TREE_ASM_WRITTEN (x) = 0; + DECL_RTL (x) = 0; + rest_of_decl_compilation (x, 0, IDENTIFIER_LOCAL_VALUE (x) == 0, 0); + TREE_ADDRESSABLE (x) = 1; + + pop_obstacks (); + + return 1; + } + /* Caller should not be trying to mark initialized + constant fields addressable. */ + my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0 + || DECL_IN_AGGR_P (x) == 0 + || TREE_STATIC (x) + || DECL_EXTERNAL (x), 314); + + case CONST_DECL: + case RESULT_DECL: + /* For C++, we don't warn about taking the address of a register + variable for CONST_DECLs; ARM p97 explicitly says it's okay. */ + put_var_into_stack (x); + TREE_ADDRESSABLE (x) = 1; + return 1; + + case FUNCTION_DECL: + /* We have to test both conditions here. The first may + be non-zero in the case of processing a default function. + The second may be non-zero in the case of a template function. */ + x = DECL_MAIN_VARIANT (x); + if ((DECL_INLINE (x) || DECL_PENDING_INLINE_INFO (x)) + && (DECL_CONTEXT (x) == NULL_TREE + || TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (x))) != 't' + || ! CLASSTYPE_INTERFACE_ONLY (DECL_CONTEXT (x)))) + { + mark_inline_for_output (x); + if (x == current_function_decl) + DECL_EXTERNAL (x) = 0; + } + TREE_ADDRESSABLE (x) = 1; + TREE_USED (x) = 1; + TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; + return 1; + + default: + return 1; + } +} + +/* Build and return a conditional expression IFEXP ? OP1 : OP2. */ + +tree +build_x_conditional_expr (ifexp, op1, op2) + tree ifexp, op1, op2; +{ + tree rval = NULL_TREE; + + /* See comments in `build_x_binary_op'. */ + if (op1 != 0) + rval = build_opfncall (COND_EXPR, LOOKUP_SPECULATIVELY, ifexp, op1, op2); + if (rval) + return build_opfncall (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); + + return build_conditional_expr (ifexp, op1, op2); +} + +tree +build_conditional_expr (ifexp, op1, op2) + tree ifexp, op1, op2; +{ + register tree type1; + register tree type2; + register enum tree_code code1; + register enum tree_code code2; + register tree result_type = NULL_TREE; + tree orig_op1 = op1, orig_op2 = op2; + + /* If second operand is omitted, it is the same as the first one; + make sure it is calculated only once. */ + if (op1 == 0) + { + if (pedantic) + pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression"); + ifexp = op1 = save_expr (ifexp); + } + + ifexp = bool_truthvalue_conversion (default_conversion (ifexp)); + + if (TREE_CODE (ifexp) == ERROR_MARK) + return error_mark_node; + + op1 = require_instantiated_type (TREE_TYPE (op2), op1, error_mark_node); + if (op1 == error_mark_node) + return error_mark_node; + op2 = require_instantiated_type (TREE_TYPE (op1), op2, error_mark_node); + if (op2 == error_mark_node) + return error_mark_node; + + /* C++: REFERENCE_TYPES must be dereferenced. */ + type1 = TREE_TYPE (op1); + code1 = TREE_CODE (type1); + type2 = TREE_TYPE (op2); + code2 = TREE_CODE (type2); + + if (code1 == REFERENCE_TYPE) + { + op1 = convert_from_reference (op1); + type1 = TREE_TYPE (op1); + code1 = TREE_CODE (type1); + } + if (code2 == REFERENCE_TYPE) + { + op2 = convert_from_reference (op2); + type2 = TREE_TYPE (op2); + code2 = TREE_CODE (type2); + } + +#if 1 /* Produces wrong result if within sizeof. Sorry. */ + /* Don't promote the operands separately if they promote + the same way. Return the unpromoted type and let the combined + value get promoted if necessary. */ + + if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2) + && code2 != ARRAY_TYPE +#if 0 + /* For C++, let the enumeral type come through. */ + && code2 != ENUMERAL_TYPE +#endif + && code2 != FUNCTION_TYPE + && code2 != METHOD_TYPE) + { + tree result; + + if (TREE_CONSTANT (ifexp) + && (TREE_CODE (ifexp) == INTEGER_CST + || TREE_CODE (ifexp) == ADDR_EXPR)) + return (integer_zerop (ifexp) ? op2 : op1); + + if (TREE_CODE (op1) == CONST_DECL) + op1 = DECL_INITIAL (op1); + else if (TREE_READONLY_DECL_P (op1)) + op1 = decl_constant_value (op1); + if (TREE_CODE (op2) == CONST_DECL) + op2 = DECL_INITIAL (op2); + else if (TREE_READONLY_DECL_P (op2)) + op2 = decl_constant_value (op2); + if (type1 != type2) + type1 = c_build_type_variant + (type1, + TREE_READONLY (op1) || TREE_READONLY (op2), + TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); + /* ??? This is a kludge to deal with the fact that + we don't sort out integers and enums properly, yet. */ + result = fold (build (COND_EXPR, type1, ifexp, op1, op2)); + if (TREE_TYPE (result) != type1) + result = build1 (NOP_EXPR, type1, result); + return result; + } +#endif + + /* They don't match; promote them both and then try to reconcile them. + But don't permit mismatching enum types. */ + if (code1 == ENUMERAL_TYPE) + { + if (code2 == ENUMERAL_TYPE) + { + message_2_types (error, "enumeral mismatch in conditional expression: `%s' vs `%s'", type1, type2); + return error_mark_node; + } + else if (extra_warnings && ! IS_AGGR_TYPE_CODE (code2)) + warning ("enumeral and non-enumeral type in conditional expression"); + } + else if (extra_warnings + && code2 == ENUMERAL_TYPE && ! IS_AGGR_TYPE_CODE (code1)) + warning ("enumeral and non-enumeral type in conditional expression"); + + if (code1 != VOID_TYPE) + { + op1 = default_conversion (op1); + type1 = TREE_TYPE (op1); + code1 = TREE_CODE (type1); + } + if (code2 != VOID_TYPE) + { + op2 = default_conversion (op2); + type2 = TREE_TYPE (op2); + code2 = TREE_CODE (type2); + } + + /* Quickly detect the usual case where op1 and op2 have the same type + after promotion. */ + if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) + { + if (type1 == type2) + result_type = type1; + else + result_type = c_build_type_variant + (type1, + TREE_READONLY (op1) || TREE_READONLY (op2), + TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); + } + else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) + && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) + { + result_type = common_type (type1, type2); + } + else if (code1 == VOID_TYPE || code2 == VOID_TYPE) + { + if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) + pedwarn ("ANSI C++ forbids conditional expr with only one void side"); + result_type = void_type_node; + } + else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) + { + if (comp_target_types (type1, type2, 1)) + result_type = common_type (type1, type2); + else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node + && TREE_CODE (orig_op1) != NOP_EXPR) + result_type = qualify_type (type2, type1); + else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node + && TREE_CODE (orig_op2) != NOP_EXPR) + result_type = qualify_type (type1, type2); + else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) + { + if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); + result_type = qualify_type (type1, type2); + } + else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) + { + if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); + result_type = qualify_type (type2, type1); + } + /* C++ */ + else if (comptypes (type2, type1, 0)) + result_type = type2; + else if (IS_AGGR_TYPE (TREE_TYPE (type1)) + && IS_AGGR_TYPE (TREE_TYPE (type2)) + && (result_type = common_base_type (TREE_TYPE (type1), TREE_TYPE (type2)))) + { + if (result_type == error_mark_node) + { + message_2_types (error, "common base type of types `%s' and `%s' is ambiguous", + TREE_TYPE (type1), TREE_TYPE (type2)); + result_type = ptr_type_node; + } + else result_type = TYPE_POINTER_TO (result_type); + } + else + { + pedwarn ("pointer type mismatch in conditional expression"); + result_type = ptr_type_node; + } + } + else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) + { + if (!integer_zerop (op2)) + pedwarn ("pointer/integer type mismatch in conditional expression"); + else + { + op2 = null_pointer_node; +#if 0 /* Sez who? */ + if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids conditional expr between 0 and function pointer"); +#endif + } + result_type = type1; + } + else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) + { + if (!integer_zerop (op1)) + pedwarn ("pointer/integer type mismatch in conditional expression"); + else + { + op1 = null_pointer_node; +#if 0 /* Sez who? */ + if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) + pedwarn ("ANSI C++ forbids conditional expr between 0 and function pointer"); +#endif + } + result_type = type2; + } + + if (!result_type) + { + /* The match does not look good. If either is + an aggregate value, try converting to a scalar type. */ + if (code1 == RECORD_TYPE && code2 == RECORD_TYPE) + { + message_2_types (error, "aggregate mismatch in conditional expression: `%s' vs `%s'", type1, type2); + return error_mark_node; + } + if (code1 == RECORD_TYPE && TYPE_HAS_CONVERSION (type1)) + { + tree tmp = build_type_conversion (CONVERT_EXPR, type2, op1, 0); + if (tmp == NULL_TREE) + { + cp_error ("aggregate type `%T' could not convert on lhs of `:'", type1); + return error_mark_node; + } + if (tmp == error_mark_node) + error ("ambiguous pointer conversion"); + result_type = type2; + op1 = tmp; + } + else if (code2 == RECORD_TYPE && TYPE_HAS_CONVERSION (type2)) + { + tree tmp = build_type_conversion (CONVERT_EXPR, type1, op2, 0); + if (tmp == NULL_TREE) + { + cp_error ("aggregate type `%T' could not convert on rhs of `:'", type2); + return error_mark_node; + } + if (tmp == error_mark_node) + error ("ambiguous pointer conversion"); + result_type = type1; + op2 = tmp; + } + else if (flag_cond_mismatch) + result_type = void_type_node; + else + { + error ("type mismatch in conditional expression"); + return error_mark_node; + } + } + + if (result_type != TREE_TYPE (op1)) + op1 = convert_and_check (result_type, op1); + if (result_type != TREE_TYPE (op2)) + op2 = convert_and_check (result_type, op2); + +#if 0 + /* XXX delete me, I've been here for years. */ + if (IS_AGGR_TYPE_CODE (code1)) + { + result_type = TREE_TYPE (op1); + if (TREE_CONSTANT (ifexp)) + return (integer_zerop (ifexp) ? op2 : op1); + + if (TYPE_MODE (result_type) == BLKmode) + { + register tree tempvar + = build_decl (VAR_DECL, NULL_TREE, result_type); + register tree xop1 = build_modify_expr (tempvar, NOP_EXPR, op1); + register tree xop2 = build_modify_expr (tempvar, NOP_EXPR, op2); + register tree result = fold (build (COND_EXPR, result_type, + ifexp, xop1, xop2)); + + layout_decl (tempvar, 0); + /* No way to handle variable-sized objects here. + I fear that the entire handling of BLKmode conditional exprs + needs to be redone. */ + my_friendly_assert (TREE_CONSTANT (DECL_SIZE (tempvar)), 315); + DECL_RTL (tempvar) + = assign_stack_local (DECL_MODE (tempvar), + (TREE_INT_CST_LOW (DECL_SIZE (tempvar)) + + BITS_PER_UNIT - 1) + / BITS_PER_UNIT, + 0); + + TREE_SIDE_EFFECTS (result) + = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1) + | TREE_SIDE_EFFECTS (op2); + return build (COMPOUND_EXPR, result_type, result, tempvar); + } + } +#endif /* 0 */ + + if (TREE_CONSTANT (ifexp)) + return integer_zerop (ifexp) ? op2 : op1; + + return fold (build (COND_EXPR, result_type, ifexp, op1, op2)); +} + +/* Handle overloading of the ',' operator when needed. Otherwise, + this function just builds an expression list. */ +tree +build_x_compound_expr (list) + tree list; +{ + tree rest = TREE_CHAIN (list); + tree result; + + if (rest == NULL_TREE) + return build_compound_expr (list); + + result = build_opfncall (COMPOUND_EXPR, LOOKUP_NORMAL, + TREE_VALUE (list), TREE_VALUE (rest), NULL_TREE); + if (result) + return build_x_compound_expr (tree_cons (NULL_TREE, result, TREE_CHAIN (rest))); + return build_compound_expr (tree_cons (NULL_TREE, TREE_VALUE (list), + build_tree_list (NULL_TREE, build_x_compound_expr (rest)))); +} + +/* Given a list of expressions, return a compound expression + that performs them all and returns the value of the last of them. */ + +tree +build_compound_expr (list) + tree list; +{ + register tree rest; + + if (TREE_READONLY_DECL_P (TREE_VALUE (list))) + TREE_VALUE (list) = decl_constant_value (TREE_VALUE (list)); + + if (TREE_CHAIN (list) == 0) + { + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */ + if (TREE_CODE (list) == NOP_EXPR + && TREE_TYPE (list) == TREE_TYPE (TREE_OPERAND (list, 0))) + list = TREE_OPERAND (list, 0); + + /* Convert arrays to pointers. */ + if (TREE_CODE (TREE_TYPE (TREE_VALUE (list))) == ARRAY_TYPE) + return default_conversion (TREE_VALUE (list)); + else + return TREE_VALUE (list); + } + + rest = build_compound_expr (TREE_CHAIN (list)); + + /* When pedantic, a compound expression can be neither an lvalue + nor an integer constant expression. */ + if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) + return rest; + + return build (COMPOUND_EXPR, TREE_TYPE (rest), + break_out_cleanups (TREE_VALUE (list)), rest); +} + +tree build_static_cast (type, expr) + tree type, expr; +{ + return build_c_cast (type, expr); +} + +tree build_reinterpret_cast (type, expr) + tree type, expr; +{ + return build_c_cast (type, expr); +} + +tree build_const_cast (type, expr) + tree type, expr; +{ + return build_c_cast (type, expr); +} + +/* Build an expression representing a cast to type TYPE of expression EXPR. */ + +tree +build_c_cast (type, expr) + register tree type; + tree expr; +{ + register tree value = expr; + + if (type == error_mark_node || expr == error_mark_node) + return error_mark_node; + + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Strip such NOP_EXPRs, since VALUE is being used in non-lvalue context. */ + if (TREE_CODE (value) == NOP_EXPR + && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) + value = TREE_OPERAND (value, 0); + + if (TREE_TYPE (expr) + && TREE_CODE (TREE_TYPE (expr)) == OFFSET_TYPE + && TREE_CODE (type) != OFFSET_TYPE) + value = resolve_offset_ref (value); + + if (TREE_CODE (type) == ARRAY_TYPE) + { + /* Allow casting from T1* to T2[] because Cfront allows it. + NIHCL uses it. It is not valid ANSI C however, and hence, not + valid ANSI C++. */ + if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) + { + if (pedantic) + pedwarn ("ANSI C++ forbids casting to an array type"); + type = build_pointer_type (TREE_TYPE (type)); + } + else + { + error ("ANSI C++ forbids casting to an array type"); + return error_mark_node; + } + } + + if (TREE_CODE (type) == FUNCTION_TYPE + || TREE_CODE (type) == METHOD_TYPE) + { + cp_error ("casting to function type `%T'", type); + return error_mark_node; + } + + if (IS_SIGNATURE (type)) + { + error ("cast specifies signature type"); + return error_mark_node; + } + + /* If there's only one function in the overloaded space, + just take it. */ + if (TREE_CODE (value) == TREE_LIST + && TREE_CHAIN (value) == NULL_TREE) + value = TREE_VALUE (value); + + if (TREE_CODE (type) == VOID_TYPE) + value = build1 (NOP_EXPR, type, value); + else if (TREE_TYPE (value) == NULL_TREE + || type_unknown_p (value)) + { + value = instantiate_type (type, value, 1); + /* Did we lose? */ + if (value == error_mark_node) + return error_mark_node; + } + else + { + tree otype, ovalue; + + /* Convert functions and arrays to pointers and + convert references to their expanded types, + but don't convert any other types. */ + if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE + || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE + || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE) + value = default_conversion (value); + otype = TREE_TYPE (value); + + /* Optionally warn about potentially worrisome casts. */ + + if (warn_cast_qual + && TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (otype) == POINTER_TYPE) + { + /* For C++ we make these regular warnings, rather than + softening them into pedwarns. */ + if (TYPE_VOLATILE (TREE_TYPE (otype)) + && ! TYPE_VOLATILE (TREE_TYPE (type))) + warning ("cast discards `volatile' from pointer target type"); + if (TYPE_READONLY (TREE_TYPE (otype)) + && ! TYPE_READONLY (TREE_TYPE (type))) + warning ("cast discards `const' from pointer target type"); + } + + /* Warn about possible alignment problems. */ + if (STRICT_ALIGNMENT && warn_cast_align + && TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (otype) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE + && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE + && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) + warning ("cast increases required alignment of target type"); + +#if 0 + if (TREE_CODE (type) == INTEGER_TYPE + && TREE_CODE (otype) == POINTER_TYPE + && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) + warning ("cast from pointer to integer of different size"); + + if (TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (otype) == INTEGER_TYPE + && TYPE_PRECISION (type) != TYPE_PRECISION (otype) + /* Don't warn about converting 0 to pointer, + provided the 0 was explicit--not cast or made by folding. */ + && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))) + warning ("cast to pointer from integer of different size"); +#endif + + ovalue = value; + value = convert_force (type, value); + + /* Ignore any integer overflow caused by the cast. */ + if (TREE_CODE (value) == INTEGER_CST) + { + TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); + TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); + } + } + + /* Always produce some operator for an explicit cast, + so we can tell (for -pedantic) that the cast is no lvalue. + Also, pedantically, don't let (void *) (FOO *) 0 be a null + pointer constant. */ + if (value == expr + || (pedantic + && TREE_CODE (value) == INTEGER_CST + && TREE_CODE (expr) == INTEGER_CST + && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)) + { + tree nvalue = build1 (NOP_EXPR, type, value); + TREE_CONSTANT (nvalue) = TREE_CONSTANT (value); + return nvalue; + } + + return value; +} + +#if 0 +/* Build an assignment expression of lvalue LHS from value RHS. + + In C++, if the left hand side of the assignment is a REFERENCE_TYPE, + that reference becomes deferenced down to it base type. */ + +/* Return a reference to the BASE_INDEX part of EXPR. TYPE is + the type to which BASE_INDEX applies. */ +static tree +get_base_ref (type, base_index, expr) + tree type; + int base_index; + tree expr; +{ + tree binfos = TYPE_BINFO_BASETYPES (type); + tree base_binfo = TREE_VEC_ELT (binfos, base_index); + tree ref; + + if (TREE_CODE (expr) == ARRAY_REF + || ! BINFO_OFFSET_ZEROP (base_binfo) + || TREE_VIA_VIRTUAL (base_binfo) + || TYPE_MODE (type) != TYPE_MODE (BINFO_TYPE (base_binfo))) + { + tree addr = build_unary_op (ADDR_EXPR, expr, 0); + ref = build_indirect_ref (convert_pointer_to (base_binfo, addr), + NULL_PTR); + } + else + { + ref = copy_node (expr); + TREE_TYPE (ref) = BINFO_TYPE (base_binfo); + } + return ref; +} + +/* Build an assignment expression of lvalue LHS from value RHS. + MODIFYCODE is the code for a binary operator that we use + to combine the old value of LHS with RHS to get the new value. + Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. + + C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. + + `build_modify_expr_1' implements recursive part of memberwise + assignment operation. */ +static tree +build_modify_expr_1 (lhs, modifycode, rhs, basetype_path) + tree lhs, rhs; + enum tree_code modifycode; + tree basetype_path; +{ + register tree result; + tree newrhs = rhs; + tree lhstype = TREE_TYPE (lhs); + tree olhstype = lhstype; + + /* Avoid duplicate error messages from operands that had errors. */ + if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) + return error_mark_node; + + /* If a binary op has been requested, combine the old LHS value with the RHS + producing the value we should actually store into the LHS. */ + + if (modifycode == INIT_EXPR) + ; + else if (modifycode == NOP_EXPR) + { + /* must deal with overloading of `operator=' here. */ + if (TREE_CODE (lhstype) == REFERENCE_TYPE) + lhstype = TREE_TYPE (lhstype); + else + lhstype = olhstype; + } + else + { + lhs = stabilize_reference (lhs); + newrhs = build_binary_op (modifycode, lhs, rhs, 1); + modifycode = NOP_EXPR; + } + + /* If storing into a structure or union member, + it has probably been given type `int'. + Compute the type that would go with + the actual amount of storage the member occupies. */ + + if (TREE_CODE (lhs) == COMPONENT_REF + && (TREE_CODE (lhstype) == INTEGER_TYPE + || TREE_CODE (lhstype) == REAL_TYPE + || TREE_CODE (lhstype) == ENUMERAL_TYPE)) + lhstype = TREE_TYPE (get_unwidened (lhs, 0)); + + /* C++: The semantics of C++ differ from those of C when an + assignment of an aggregate is desired. Assignment in C++ is + now defined as memberwise assignment of non-static members + and base class objects. This rule applies recursively + until a member of a built-in type is found. + + Also, we cannot do a bit-wise copy of aggregates which + contain virtual function table pointers. Those + pointer values must be preserved through the copy. + However, this is handled in expand_expr, and not here. + This is because much better code can be generated at + that stage than this one. */ + if (TREE_CODE (lhstype) == RECORD_TYPE + && TYPE_LANG_SPECIFIC (lhstype) + && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) + { + register tree elt; + int i; + + /* Perform operation on object. */ + if (modifycode == INIT_EXPR && TYPE_HAS_INIT_REF (lhstype)) + { + result = build_method_call (lhs, constructor_name_full (lhstype), + build_tree_list (NULL_TREE, rhs), + basetype_path, LOOKUP_NORMAL); + return build_indirect_ref (result, NULL_PTR); + } + else if (modifycode == NOP_EXPR) + { + /* `operator=' is not an inheritable operator; see 13.4.3. */ + if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_HAS_ASSIGNMENT (lhstype)) + { + result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, + lhs, rhs, make_node (NOP_EXPR)); + if (result == NULL_TREE) + return error_mark_node; + return result; + } + } + + if (TYPE_USES_VIRTUAL_BASECLASSES (lhstype) + || (modifycode == NOP_EXPR && TYPE_GETS_ASSIGNMENT (lhstype)) + || (modifycode == INIT_EXPR && TYPE_GETS_INIT_REF (lhstype))) + { + tree binfos = BINFO_BASETYPES (TYPE_BINFO (lhstype)); + result = NULL_TREE; + + if (binfos != NULL_TREE) + /* Perform operation on each member, depth-first, left-right. */ + for (i = 0; i <= TREE_VEC_LENGTH (binfos)-1; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + tree base_lhs, base_rhs; + tree new_result; + + /* Assignments from virtual baseclasses handled elsewhere. */ + if (TREE_VIA_VIRTUAL (base_binfo)) + continue; + + base_lhs = get_base_ref (lhstype, i, lhs); + base_rhs = get_base_ref (lhstype, i, newrhs); + + BINFO_INHERITANCE_CHAIN (base_binfo) = basetype_path; + new_result + = build_modify_expr_1 (base_lhs, modifycode, base_rhs, + base_binfo); + + /* We either get back a compound stmt, or a simple one. */ + if (new_result && TREE_CODE (new_result) == TREE_LIST) + new_result = build_compound_expr (new_result); + result = tree_cons (NULL_TREE, new_result, result); + } + + for (elt = TYPE_FIELDS (lhstype); elt; elt = TREE_CHAIN (elt)) + { + tree vbases = NULL_TREE; + tree elt_lhs, elt_rhs; + + if (TREE_CODE (elt) != FIELD_DECL) + continue; + if (DECL_NAME (elt) + && (VFIELD_NAME_P (DECL_NAME (elt)) + || VBASE_NAME_P (DECL_NAME (elt)))) + continue; + + if (TREE_READONLY (elt) + || TREE_CODE (TREE_TYPE (elt)) == REFERENCE_TYPE) + { + cp_error ("cannot generate default `%T::operator ='", + lhstype); + if (TREE_CODE (TREE_TYPE (elt)) == REFERENCE_TYPE) + cp_error_at ("because member `%#D' is a reference", elt); + else + cp_error_at ("because member `%#D' is const", elt); + + return error_mark_node; + } + + if (IS_AGGR_TYPE (TREE_TYPE (elt)) + && TYPE_LANG_SPECIFIC (TREE_TYPE (elt))) + vbases = CLASSTYPE_VBASECLASSES (TREE_TYPE (elt)); + + elt_lhs = build (COMPONENT_REF, TREE_TYPE (elt), lhs, elt); + elt_rhs = build (COMPONENT_REF, TREE_TYPE (elt), newrhs, elt); + /* It is not always safe to go through `build_modify_expr_1' + when performing element-wise copying. This is because + an element may be of ARRAY_TYPE, which will not + be properly copied as a naked element. */ + if (TREE_CODE (TREE_TYPE (elt)) == RECORD_TYPE + && TYPE_LANG_SPECIFIC (TREE_TYPE (elt))) + basetype_path = TYPE_BINFO (TREE_TYPE (elt)); + + while (vbases) + { + tree elt_lhs_addr = build_unary_op (ADDR_EXPR, elt_lhs, 0); + tree elt_rhs_addr = build_unary_op (ADDR_EXPR, elt_rhs, 0); + + elt_lhs_addr = convert_pointer_to (vbases, elt_lhs_addr); + elt_rhs_addr = convert_pointer_to (vbases, elt_rhs_addr); + result + = tree_cons (NULL_TREE, + build_modify_expr_1 + (build_indirect_ref (elt_lhs_addr, NULL_PTR), + modifycode, + build_indirect_ref (elt_rhs_addr, NULL_PTR), + basetype_path), + result); + if (TREE_VALUE (result) == error_mark_node) + return error_mark_node; + vbases = TREE_CHAIN (vbases); + } + elt_lhs = build_modify_expr_1 (elt_lhs, modifycode, elt_rhs, + basetype_path); + result = tree_cons (NULL_TREE, elt_lhs, result); + } + + if (result) + return build_compound_expr (result); + /* No fields to move. */ + return integer_zero_node; + } + else + { + result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, + void_type_node, lhs, rhs); + TREE_SIDE_EFFECTS (result) = 1; + return result; + } + } + + result = build_modify_expr (lhs, modifycode, newrhs); + /* ARRAY_TYPEs cannot be converted to anything meaningful, + and leaving it there screws up `build_compound_expr' when + it tries to defaultly convert everything. */ + if (TREE_CODE (TREE_TYPE (result)) == ARRAY_TYPE) + TREE_TYPE (result) = void_type_node; + return result; +} +#endif + +/* Taken from expr.c: + Subroutine of expand_expr: + record the non-copied parts (LIST) of an expr (LHS), and return a list + which specifies the initial values of these parts. */ + +static tree +init_noncopied_parts (lhs, list) + tree lhs; + tree list; +{ + tree tail; + tree parts = 0; + + for (tail = list; tail; tail = TREE_CHAIN (tail)) + if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST) + parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail))); + else + { + tree part = TREE_VALUE (tail); + tree part_type = TREE_TYPE (part); + tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part); + parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts); + } + return parts; +} + +/* Build an assignment expression of lvalue LHS from value RHS. + MODIFYCODE is the code for a binary operator that we use + to combine the old value of LHS with RHS to get the new value. + Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. + + C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. +*/ +tree +build_modify_expr (lhs, modifycode, rhs) + tree lhs; + enum tree_code modifycode; + tree rhs; +{ + register tree result; + tree newrhs = rhs; + tree lhstype = TREE_TYPE (lhs); + tree olhstype = lhstype; + tree olhs = lhs; + + /* Types that aren't fully specified cannot be used in assignments. */ + lhs = require_complete_type (lhs); + + /* Avoid duplicate error messages from operands that had errors. */ + if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) + return error_mark_node; + + /* Decide early if we are going to protect RHS from GC + before assigning it to LHS. */ + if (type_needs_gc_entry (TREE_TYPE (rhs)) + && ! value_safe_from_gc (lhs, rhs)) + rhs = protect_value_from_gc (lhs, rhs); + + newrhs = rhs; + + /* Handle assignment to signature pointers/refs. */ + + if (TYPE_LANG_SPECIFIC (lhstype) && + (IS_SIGNATURE_POINTER (lhstype) || IS_SIGNATURE_REFERENCE (lhstype))) + { + return build_signature_pointer_constructor (lhs, rhs); + } + + /* Handle control structure constructs used as "lvalues". */ + + switch (TREE_CODE (lhs)) + { + /* Handle --foo = 5; as these are valid constructs in C++ */ + case PREDECREMENT_EXPR: + case PREINCREMENT_EXPR: + if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) + lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs), + stabilize_reference (TREE_OPERAND (lhs, 0))); + return build (COMPOUND_EXPR, lhstype, + lhs, + build_modify_expr (TREE_OPERAND (lhs, 0), + modifycode, rhs)); + + /* Handle (a, b) used as an "lvalue". */ + case COMPOUND_EXPR: + newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), + modifycode, rhs); + if (TREE_CODE (newrhs) == ERROR_MARK) + return error_mark_node; + return build (COMPOUND_EXPR, lhstype, + TREE_OPERAND (lhs, 0), newrhs); + + case MODIFY_EXPR: + newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs); + if (TREE_CODE (newrhs) == ERROR_MARK) + return error_mark_node; + return build (COMPOUND_EXPR, lhstype, lhs, newrhs); + + /* Handle (a ? b : c) used as an "lvalue". */ + case COND_EXPR: + rhs = save_expr (rhs); + { + /* Produce (a ? (b = rhs) : (c = rhs)) + except that the RHS goes through a save-expr + so the code to compute it is only emitted once. */ + tree cond + = build_conditional_expr (TREE_OPERAND (lhs, 0), + build_modify_expr (TREE_OPERAND (lhs, 1), + modifycode, rhs), + build_modify_expr (TREE_OPERAND (lhs, 2), + modifycode, rhs)); + if (TREE_CODE (cond) == ERROR_MARK) + return cond; + /* Make sure the code to compute the rhs comes out + before the split. */ + return build (COMPOUND_EXPR, TREE_TYPE (lhs), + /* Case to void to suppress warning + from warn_if_unused_value. */ + convert (void_type_node, rhs), cond); + } + } + + if (TREE_CODE (lhs) == OFFSET_REF) + { + if (TREE_OPERAND (lhs, 0) == NULL_TREE) + { + /* Static class member? */ + tree member = TREE_OPERAND (lhs, 1); + if (TREE_CODE (member) == VAR_DECL) + lhs = member; + else + { + compiler_error ("invalid static class member"); + return error_mark_node; + } + } + else + lhs = resolve_offset_ref (lhs); + + olhstype = lhstype = TREE_TYPE (lhs); + } + + if (TREE_CODE (lhstype) == REFERENCE_TYPE + && modifycode != INIT_EXPR) + { + lhs = convert_from_reference (lhs); + olhstype = lhstype = TREE_TYPE (lhs); + } + + /* If a binary op has been requested, combine the old LHS value with the RHS + producing the value we should actually store into the LHS. */ + + if (modifycode == INIT_EXPR) + { + if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_HAS_CONSTRUCTOR (lhstype)) + { + result = build_method_call (lhs, constructor_name_full (lhstype), + build_tree_list (NULL_TREE, rhs), + NULL_TREE, LOOKUP_NORMAL); + if (result == NULL_TREE) + return error_mark_node; + return result; + } + } + else if (modifycode == NOP_EXPR) + { +#if 1 + /* `operator=' is not an inheritable operator. */ + if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_HAS_ASSIGNMENT (lhstype)) + { + result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, + lhs, rhs, make_node (NOP_EXPR)); + if (result == NULL_TREE) + return error_mark_node; + return result; + } +#else + /* Treat `operator=' as an inheritable operator. */ + if (TYPE_LANG_SPECIFIC (lhstype) && TYPE_GETS_ASSIGNMENT (lhstype)) + { + tree orig_lhstype = lhstype; + while (! TYPE_HAS_ASSIGNMENT (lhstype)) + { + int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (lhstype); + tree basetype = NULL_TREE; + for (i = 0; i < n_baseclasses; i++) + if (TYPE_GETS_ASSIGNMENT (TYPE_BINFO_BASETYPE (lhstype, i))) + { + if (basetype != NULL_TREE) + { + message_2_types (error, "base classes `%s' and `%s' both have operator ='", + basetype, + TYPE_BINFO_BASETYPE (lhstype, i)); + return error_mark_node; + } + basetype = TYPE_BINFO_BASETYPE (lhstype, i); + } + lhstype = basetype; + } + if (orig_lhstype != lhstype) + { + lhs = build_indirect_ref (convert_pointer_to (lhstype, + build_unary_op (ADDR_EXPR, lhs, 0)), NULL_PTR); + if (lhs == error_mark_node) + { + cp_error ("conversion to private basetype `%T'", lhstype); + return error_mark_node; + } + } + result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, + lhs, rhs, make_node (NOP_EXPR)); + if (result == NULL_TREE) + return error_mark_node; + return result; + } +#endif + lhstype = olhstype; + } + else if (PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE)) + { + /* This case must convert to some sort of lvalue that + can participate in an op= operation. */ + tree lhs_tmp = lhs; + tree rhs_tmp = rhs; + if (build_default_binary_type_conversion (modifycode, &lhs_tmp, &rhs_tmp)) + { + lhs = stabilize_reference (lhs_tmp); + /* Forget is was ever anything else. */ + olhstype = lhstype = TREE_TYPE (lhs); + newrhs = build_binary_op (modifycode, lhs, rhs_tmp, 1); + } + else + return error_mark_node; + } + else + { + lhs = stabilize_reference (lhs); + newrhs = build_binary_op (modifycode, lhs, rhs, 1); + } + + /* Handle a cast used as an "lvalue". + We have already performed any binary operator using the value as cast. + Now convert the result to the cast type of the lhs, + and then true type of the lhs and store it there; + then convert result back to the cast type to be the value + of the assignment. */ + + switch (TREE_CODE (lhs)) + { + case NOP_EXPR: + case CONVERT_EXPR: + case FLOAT_EXPR: + case FIX_TRUNC_EXPR: + case FIX_FLOOR_EXPR: + case FIX_ROUND_EXPR: + case FIX_CEIL_EXPR: + if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE + || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE + || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE) + newrhs = default_conversion (newrhs); + { + tree inner_lhs = TREE_OPERAND (lhs, 0); + tree result; + if (! lvalue_p (lhs) && pedantic) + pedwarn ("cast to non-reference type used as lvalue"); + + result = build_modify_expr (inner_lhs, NOP_EXPR, + convert (TREE_TYPE (inner_lhs), + convert (lhstype, newrhs))); + if (TREE_CODE (result) == ERROR_MARK) + return result; + return convert (TREE_TYPE (lhs), result); + } + } + + /* Now we have handled acceptable kinds of LHS that are not truly lvalues. + Reject anything strange now. */ + + if (!lvalue_or_else (lhs, "assignment")) + return error_mark_node; + + GNU_xref_assign (lhs); + + /* Warn about storing in something that is `const'. */ + /* For C++, don't warn if this is initialization. */ + if (modifycode != INIT_EXPR + /* For assignment to `const' signature pointer/reference fields, + don't warn either, we already printed a better message before. */ + && ! (TREE_CODE (lhs) == COMPONENT_REF + && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs, 0))) + || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs, 0))))) + && (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) + || ((TREE_CODE (lhstype) == RECORD_TYPE + || TREE_CODE (lhstype) == UNION_TYPE) + && C_TYPE_FIELDS_READONLY (lhstype)) + || (TREE_CODE (lhstype) == REFERENCE_TYPE + && TYPE_READONLY (TREE_TYPE (lhstype))))) + readonly_error (lhs, "assignment", 0); + + /* If storing into a structure or union member, + it has probably been given type `int'. + Compute the type that would go with + the actual amount of storage the member occupies. */ + + if (TREE_CODE (lhs) == COMPONENT_REF + && (TREE_CODE (lhstype) == INTEGER_TYPE + || TREE_CODE (lhstype) == REAL_TYPE + || TREE_CODE (lhstype) == ENUMERAL_TYPE)) + { + lhstype = TREE_TYPE (get_unwidened (lhs, 0)); + + /* If storing in a field that is in actuality a short or narrower + than one, we must store in the field in its actual type. */ + + if (lhstype != TREE_TYPE (lhs)) + { + lhs = copy_node (lhs); + TREE_TYPE (lhs) = lhstype; + } + } + + /* check to see if there is an assignment to `this' */ + if (lhs == current_class_decl) + { + if (flag_this_is_variable > 0 + && DECL_NAME (current_function_decl) != NULL_TREE + && current_class_name != DECL_NAME (current_function_decl)) + warning ("assignment to `this' not in constructor or destructor"); + current_function_just_assigned_this = 1; + } + + /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen + when the type of RHS is not yet known, i.e. its type + is inherited from LHS. */ + rhs = require_instantiated_type (lhstype, newrhs, error_mark_node); + if (rhs == error_mark_node) + return error_mark_node; + newrhs = rhs; + + if (modifycode != INIT_EXPR) + { + /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */ + modifycode = NOP_EXPR; + /* Reference-bashing */ + if (TREE_CODE (lhstype) == REFERENCE_TYPE) + { + tree tmp = convert_from_reference (lhs); + lhstype = TREE_TYPE (tmp); + if (TYPE_SIZE (lhstype) == 0) + { + incomplete_type_error (lhs, lhstype); + return error_mark_node; + } + lhs = tmp; + olhstype = lhstype; + } + if (TREE_CODE (TREE_TYPE (newrhs)) == REFERENCE_TYPE) + { + tree tmp = convert_from_reference (newrhs); + if (TYPE_SIZE (TREE_TYPE (tmp)) == 0) + { + incomplete_type_error (newrhs, TREE_TYPE (tmp)); + return error_mark_node; + } + newrhs = tmp; + } + } + + if (TREE_SIDE_EFFECTS (lhs)) + lhs = stabilize_reference (lhs); + if (TREE_SIDE_EFFECTS (newrhs)) + newrhs = stabilize_reference (newrhs); + + /* C++: The semantics of C++ differ from those of C when an + assignment of an aggregate is desired. Assignment in C++ is + now defined as memberwise assignment of non-static members + and base class objects. This rule applies recursively + until a member of a built-in type is found. + + Also, we cannot do a bit-wise copy of aggregates which + contain virtual function table pointers. Those + pointer values must be preserved through the copy. + However, this is handled in expand_expr, and not here. + This is because much better code can be generated at + that stage than this one. */ + if (TREE_CODE (lhstype) == RECORD_TYPE + && ! TYPE_PTRMEMFUNC_P (lhstype) + && (TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs)) + || (TREE_CODE (TREE_TYPE (newrhs)) == RECORD_TYPE + && UNIQUELY_DERIVED_FROM_P (lhstype, TREE_TYPE (newrhs))))) + { + /* This was decided in finish_struct. */ + if (modifycode == INIT_EXPR) + cp_error ("can't generate default copy constructor for `%T'", lhstype); + else + cp_error ("can't generate default assignment operator for `%T'", + lhstype); +#if 0 + /* This is now done by generating X(X&) and operator=(X&). */ + tree vbases = CLASSTYPE_VBASECLASSES (lhstype); + tree lhs_addr = build_unary_op (ADDR_EXPR, lhs, 0); + tree rhs_addr; + + /* Memberwise assignment would cause NEWRHS to be + evaluated for every member that gets assigned. + By wrapping side-effecting exprs in a SAVE_EXPR, + NEWRHS will only be evaluated once. */ + if (IS_AGGR_TYPE (TREE_TYPE (newrhs)) + && TREE_SIDE_EFFECTS (newrhs) + /* This are things we don't have to save. */ + && TREE_CODE (newrhs) != COND_EXPR + && TREE_CODE (newrhs) != TARGET_EXPR + && TREE_CODE (newrhs) != WITH_CLEANUP_EXPR) + /* Call `break_out_cleanups' on NEWRHS in case there are cleanups. + If NEWRHS is a CALL_EXPR that needs a cleanup, failure to do so + will result in expand_expr expanding the call without knowing + that it should run the cleanup. */ + newrhs = save_expr (break_out_cleanups (newrhs)); + + if (TREE_CODE (newrhs) == COND_EXPR) + rhs_addr = rationalize_conditional_expr (ADDR_EXPR, newrhs); + else + rhs_addr = build_unary_op (ADDR_EXPR, newrhs, 0); + + result = tree_cons (NULL_TREE, + convert (build_reference_type (lhstype), lhs), + NULL_TREE); + + if (! comptypes (TREE_TYPE (lhs_addr), TREE_TYPE (rhs_addr), 1)) + rhs_addr = convert_pointer_to (TREE_TYPE (TREE_TYPE (lhs_addr)), rhs_addr); + { + tree noncopied_parts = NULL_TREE; + + if (TYPE_NONCOPIED_PARTS (lhstype) != 0) + noncopied_parts = init_noncopied_parts (lhs, + TYPE_NONCOPIED_PARTS (lhstype)); + while (noncopied_parts != 0) + { + result = tree_cons (NULL_TREE, + build_modify_expr (convert (ptr_type_node, TREE_VALUE (noncopied_parts)), + NOP_EXPR, + TREE_PURPOSE (noncopied_parts)), + result); + noncopied_parts = TREE_CHAIN (noncopied_parts); + } + } + /* Once we have our hands on an address, we must change NEWRHS + to work from there. Otherwise we can get multiple evaluations + of NEWRHS. */ + if (TREE_CODE (newrhs) != SAVE_EXPR) + newrhs = build_indirect_ref (rhs_addr, NULL_PTR); + + while (vbases) + { + tree elt_lhs = convert_pointer_to (vbases, lhs_addr); + tree elt_rhs = convert_pointer_to (vbases, rhs_addr); + result + = tree_cons (NULL_TREE, + build_modify_expr_1 (build_indirect_ref (elt_lhs, NULL_PTR), + modifycode, + build_indirect_ref (elt_rhs, NULL_PTR), + TYPE_BINFO (lhstype)), + result); + if (TREE_VALUE (result) == error_mark_node) + return error_mark_node; + vbases = TREE_CHAIN (vbases); + } + result = tree_cons (NULL_TREE, + build_modify_expr_1 (lhs, + modifycode, + newrhs, + TYPE_BINFO (lhstype)), + result); + return build_compound_expr (result); +#endif + } + + /* Convert new value to destination type. */ + + if (TREE_CODE (lhstype) == ARRAY_TYPE) + { + /* Allow array assignment in compiler-generated code. */ + if ((pedantic || flag_ansi) + && ! DECL_ARTIFICIAL (current_function_decl)) + pedwarn ("ANSI C++ forbids assignment between arrays"); + + /* Have to wrap this in RTL_EXPR for two cases: + in base or member initialization and if we + are a branch of a ?: operator. Since we + can't easily know the latter, just do it always. */ + + result = make_node (RTL_EXPR); + + TREE_TYPE (result) = void_type_node; + do_pending_stack_adjust (); + start_sequence_for_rtl_expr (result); + + /* As a matter of principle, `start_sequence' should do this. */ + emit_note (0, -1); + + expand_vec_init (lhs, lhs, array_type_nelts (lhstype), newrhs, + 1 + (modifycode != INIT_EXPR)); + + do_pending_stack_adjust (); + + TREE_SIDE_EFFECTS (result) = 1; + RTL_EXPR_SEQUENCE (result) = get_insns (); + RTL_EXPR_RTL (result) = const0_rtx; + end_sequence (); + return result; + } + + if (modifycode == INIT_EXPR) + { + newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL, + "assignment", NULL_TREE, 0); + if (lhs == DECL_RESULT (current_function_decl)) + { + if (DECL_INITIAL (lhs)) + warning ("return value from function receives multiple initializations"); + DECL_INITIAL (lhs) = newrhs; + } + } + else + { + if (IS_AGGR_TYPE (lhstype)) + { + if (result = build_opfncall (MODIFY_EXPR, + LOOKUP_NORMAL, lhs, newrhs, + make_node (NOP_EXPR))) + return result; + } + /* Avoid warnings on enum bit fields. */ + if (TREE_CODE (olhstype) == ENUMERAL_TYPE + && TREE_CODE (lhstype) == INTEGER_TYPE) + { + newrhs = convert_for_assignment (olhstype, newrhs, "assignment", + NULL_TREE, 0); + newrhs = convert_force (lhstype, newrhs); + } + else + newrhs = convert_for_assignment (lhstype, newrhs, "assignment", + NULL_TREE, 0); + if (flag_elide_constructors == 0 + && TREE_CODE (newrhs) == CALL_EXPR + && TREE_ADDRESSABLE (lhstype)) + { + /* Can't initialized directly from a CALL_EXPR, since + we don't know about what doesn't alias what. */ + + tree temp = get_temp_name (lhstype, 0); + newrhs = build (COMPOUND_EXPR, lhstype, + build_modify_expr (temp, INIT_EXPR, newrhs), + temp); + } + } + + if (TREE_CODE (newrhs) == ERROR_MARK) + return error_mark_node; + + if (TREE_CODE (newrhs) == COND_EXPR) + { + tree lhs1; + tree cond = TREE_OPERAND (newrhs, 0); + + if (TREE_SIDE_EFFECTS (lhs)) + cond = build_compound_expr (tree_cons + (NULL_TREE, lhs, + build_tree_list (NULL_TREE, cond))); + + /* Cannot have two identical lhs on this one tree (result) as preexpand + calls will rip them out and fill in RTL for them, but when the + rtl is generated, the calls will only be in the first side of the + condition, not on both, or before the conditional jump! (mrs) */ + lhs1 = break_out_calls (lhs); + + if (lhs == lhs1) + /* If there's no change, the COND_EXPR behaves like any other rhs. */ + result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, + lhstype, lhs, newrhs); + else + { + tree result_type = TREE_TYPE (newrhs); + /* We have to convert each arm to the proper type because the + types may have been munged by constant folding. */ + result + = build (COND_EXPR, result_type, cond, + build_modify_expr (lhs, modifycode, + convert (result_type, + TREE_OPERAND (newrhs, 1))), + build_modify_expr (lhs1, modifycode, + convert (result_type, + TREE_OPERAND (newrhs, 2)))); + } + } + else if (modifycode != INIT_EXPR && TREE_CODE (newrhs) == WITH_CLEANUP_EXPR) + { + tree cleanup = TREE_OPERAND (newrhs, 2); + tree slot; + + /* Finish up by running cleanups and having the "value" of the lhs. */ + tree exprlist = tree_cons (NULL_TREE, cleanup, + build_tree_list (NULL_TREE, lhs)); + newrhs = TREE_OPERAND (newrhs, 0); + if (TREE_CODE (newrhs) == TARGET_EXPR) + slot = TREE_OPERAND (newrhs, 0); + else if (TREE_CODE (newrhs) == ADDR_EXPR) + { + /* Bad but legal. */ + slot = newrhs; + warning ("address taken of temporary object"); + } + else + my_friendly_abort (118); + + /* Copy the value computed in SLOT into LHS. */ + exprlist = tree_cons (NULL_TREE, + build_modify_expr (lhs, modifycode, slot), + exprlist); + /* Evaluate the expression that needs CLEANUP. This will + compute the value into SLOT. */ + exprlist = tree_cons (NULL_TREE, newrhs, exprlist); + result = convert (lhstype, build_compound_expr (exprlist)); + } + else + result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, + lhstype, lhs, newrhs); + TREE_SIDE_EFFECTS (result) = 1; + + /* If we got the LHS in a different type for storing in, + convert the result back to the nominal type of LHS + so that the value we return always has the same type + as the LHS argument. */ + + if (olhstype == TREE_TYPE (result)) + return result; + /* Avoid warnings converting integral types back into enums + for enum bit fields. */ + if (TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE + && TREE_CODE (olhstype) == ENUMERAL_TYPE) + { + result = build (COMPOUND_EXPR, olhstype, result, olhs); + TREE_NO_UNUSED_WARNING (result) = 1; + return result; + } + return convert_for_assignment (olhstype, result, "assignment", + NULL_TREE, 0); +} + + +/* Return 0 if EXP is not a valid lvalue in this language + even though `lvalue_or_else' would accept it. */ + +int +language_lvalue_valid (exp) + tree exp; +{ + return 1; +} + +/* Get differnce in deltas for different pointer to member function + types. Return inetger_zero_node, if FROM cannot be converted to a + TO type. If FORCE is true, then allow reverse conversions as well. */ +static tree +get_delta_difference (from, to, force) + tree from, to; + int force; +{ + tree delta = integer_zero_node; + tree binfo; + + if (to == from) + return delta; + + /* Should get_base_distance here, so we can check if any thing along the + path is virtual, and we need to make sure we stay + inside the real binfos when going through virtual bases. + Maybe we should replace virtual bases with + binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */ + binfo = get_binfo (from, to, 1); + if (binfo == error_mark_node) + { + error (" in pointer to member function conversion"); + return delta; + } + if (binfo == 0) + { + if (!force) + { + error_not_base_type (from, to); + error (" in pointer to member function conversion"); + return delta; + } + binfo = get_binfo (to, from, 1); + if (binfo == error_mark_node) + { + error (" in pointer to member function conversion"); + return delta; + } + if (binfo == 0) + { + error ("cannot convert pointer to member of type %T to unrelated pointer to member of type %T", from, to); + return delta; + } + if (TREE_VIA_VIRTUAL (binfo)) + { + warning ("pointer to member conversion to virtual base class will only work if your very careful"); + } + return fold (size_binop (MINUS_EXPR, + integer_zero_node, + BINFO_OFFSET (binfo))); + } + if (TREE_VIA_VIRTUAL (binfo)) + { + warning ("pointer to member conversion from virtual base class will only work if your very careful"); + } + return BINFO_OFFSET (binfo); +} + +/* Build a constructor for a pointer to member function. It can be + used to initialize global variables, local variable, or used + as a value in expressions. TYPE is the POINTER to METHOD_TYPE we + want to be. + + If FORCE is non-zero, then force this conversion, even if + we would rather not do it. Usually set when using an explicit + cast. + + Return error_mark_node, if something goes wrong. */ + +tree +build_ptrmemfunc (type, pfn, force) + tree type, pfn; + int force; +{ + tree index = integer_zero_node; + tree delta = integer_zero_node; + tree delta2 = integer_zero_node; + tree vfield_offset; + tree npfn; + tree u; + + /* Handle multiple conversions of pointer to member fucntions. */ + if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn))) + { + tree ndelta, ndelta2, nindex; + /* Is is already the right type? */ +#if 0 + /* Sorry, can't do this, the backend is too stupid. */ + if (TYPE_METHOD_BASETYPE (TREE_TYPE (type)) + == TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))))) + { + if (type != TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) + { + npfn = build1 (NOP_EXPR, TYPE_GET_PTRMEMFUNC_TYPE (type), pfn); + TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); + } + return pfn; + } +#else + if (type == TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) + return pfn; +#endif + + if (TREE_CODE (pfn) != CONSTRUCTOR) + { + tree e1, e2, e3; + ndelta = convert (sizetype, build_component_ref (pfn, delta_identifier, 0, 0)); + ndelta2 = convert (sizetype, DELTA2_FROM_PTRMEMFUNC (pfn)); + index = build_component_ref (pfn, index_identifier, 0, 0); + delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), + TYPE_METHOD_BASETYPE (TREE_TYPE (type)), + force); + delta = fold (size_binop (PLUS_EXPR, delta, ndelta)); + delta2 = fold (size_binop (PLUS_EXPR, ndelta2, delta2)); + e1 = fold (build (GT_EXPR, integer_type_node, index, integer_zero_node)); + + u = build_nt (CONSTRUCTOR, 0, tree_cons (delta2_identifier, delta2, NULL_TREE)); + u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, + tree_cons (NULL_TREE, index, + tree_cons (NULL_TREE, u, NULL_TREE)))); + e2 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); + + pfn = PFN_FROM_PTRMEMFUNC (pfn); + npfn = build1 (NOP_EXPR, type, pfn); + TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); + + u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, npfn, NULL_TREE)); + u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, + tree_cons (NULL_TREE, index, + tree_cons (NULL_TREE, u, NULL_TREE)))); + e3 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); + return build_conditional_expr (e1, e2, e3); + } + + ndelta = TREE_VALUE (CONSTRUCTOR_ELTS (pfn)); + nindex = TREE_VALUE (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn))); + npfn = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn)))); + npfn = TREE_VALUE (CONSTRUCTOR_ELTS (npfn)); + if (integer_zerop (nindex)) + pfn = integer_zero_node; + else + { + sorry ("value casting of varible nonnull pointer to member functions not supported"); + return error_mark_node; + } + } + + /* Handle null pointer to member function conversions. */ + if (integer_zerop (pfn)) + { + pfn = build_c_cast (type, integer_zero_node); + u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, pfn, NULL_TREE)); + u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, integer_zero_node, + tree_cons (NULL_TREE, integer_zero_node, + tree_cons (NULL_TREE, u, NULL_TREE)))); + return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); + } + + if (TREE_CODE (pfn) == TREE_LIST) + { + pfn = instantiate_type (type, pfn, 1); + if (pfn == error_mark_node) + return error_mark_node; + pfn = build_unary_op (ADDR_EXPR, pfn, 0); + } + + /* Allow pointer to member conversions here. */ + delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn))), + TYPE_METHOD_BASETYPE (TREE_TYPE (type)), + force); + delta2 = fold (size_binop (PLUS_EXPR, delta2, delta)); + + if (TREE_CODE (TREE_OPERAND (pfn, 0)) != FUNCTION_DECL) + warning ("assuming pointer to member function is non-virtual"); + + if (TREE_CODE (TREE_OPERAND (pfn, 0)) == FUNCTION_DECL + && DECL_VINDEX (TREE_OPERAND (pfn, 0))) + { + /* Find the offset to the vfield pointer in the object. */ + vfield_offset = get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn, 0)), + DECL_CLASS_CONTEXT (TREE_OPERAND (pfn, 0)), + 0); + vfield_offset = get_vfield_offset (vfield_offset); + delta2 = size_binop (PLUS_EXPR, vfield_offset, delta2); + + /* Map everything down one to make room for the null pointer to member. */ + index = size_binop (PLUS_EXPR, + DECL_VINDEX (TREE_OPERAND (pfn, 0)), + integer_one_node); + u = build_nt (CONSTRUCTOR, 0, tree_cons (delta2_identifier, delta2, NULL_TREE)); + } + else + { + index = fold (size_binop (MINUS_EXPR, integer_zero_node, integer_one_node)); + + npfn = build1 (NOP_EXPR, type, pfn); + TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); + + u = build_nt (CONSTRUCTOR, 0, tree_cons (pfn_identifier, npfn, NULL_TREE)); + } + + u = build_nt (CONSTRUCTOR, 0, tree_cons (NULL_TREE, delta, + tree_cons (NULL_TREE, index, + tree_cons (NULL_TREE, u, NULL_TREE)))); + return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); +} + +/* Convert value RHS to type TYPE as preparation for an assignment + to an lvalue of type TYPE. + The real work of conversion is done by `convert'. + The purpose of this function is to generate error messages + for assignments that are not allowed in C. + ERRTYPE is a string to use in error messages: + "assignment", "return", etc. + + C++: attempts to allow `convert' to find conversions involving + implicit type conversion between aggregate and scalar types + as per 8.5.6 of C++ manual. Does not randomly dereference + pointers to aggregates! */ + +static tree +convert_for_assignment (type, rhs, errtype, fndecl, parmnum) + tree type, rhs; + char *errtype; + tree fndecl; + int parmnum; +{ + register enum tree_code codel = TREE_CODE (type); + register tree rhstype; + register enum tree_code coder = TREE_CODE (TREE_TYPE (rhs)); + + if (coder == UNKNOWN_TYPE) + rhs = instantiate_type (type, rhs, 1); + + if (coder == ERROR_MARK) + return error_mark_node; + + if (codel == OFFSET_TYPE) + { + type = TREE_TYPE (type); + codel = TREE_CODE (type); + } + + /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ + if (TREE_CODE (rhs) == NON_LVALUE_EXPR) + rhs = TREE_OPERAND (rhs, 0); + + if (rhs == error_mark_node) + return error_mark_node; + + if (TREE_VALUE (rhs) == error_mark_node) + return error_mark_node; + + if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) + { + rhs = resolve_offset_ref (rhs); + if (rhs == error_mark_node) + return error_mark_node; + rhstype = TREE_TYPE (rhs); + coder = TREE_CODE (rhstype); + } + + if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE + || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) + rhs = default_conversion (rhs); + else if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) + rhs = convert_from_reference (rhs); + + rhstype = TREE_TYPE (rhs); + coder = TREE_CODE (rhstype); + + /* This should no longer change types on us. */ + if (TREE_CODE (rhs) == CONST_DECL) + rhs = DECL_INITIAL (rhs); + else if (TREE_READONLY_DECL_P (rhs)) + rhs = decl_constant_value (rhs); + + if (type == rhstype) + { + overflow_warning (rhs); + return rhs; + } + + if (coder == VOID_TYPE) + { + error ("void value not ignored as it ought to be"); + return error_mark_node; + } + /* Arithmetic types all interconvert. */ + if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == BOOLEAN_TYPE) + && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == BOOLEAN_TYPE)) + { + /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */ + if (coder == REAL_TYPE && codel == INTEGER_TYPE) + { + if (fndecl) + cp_warning ("`%T' used for argument %P of `%D'", + rhstype, parmnum, fndecl); + else + cp_warning ("%s to `%T' from `%T'", errtype, type, rhstype); + } + /* And we should warn if assigning a negative value to + an unsigned variable. */ + else if (TREE_UNSIGNED (type) && codel != BOOLEAN_TYPE) + { + if (TREE_CODE (rhs) == INTEGER_CST + && TREE_NEGATED_INT (rhs)) + { + if (fndecl) + cp_warning ("negative value `%E' passed as argument %P of `%D'", + rhs, parmnum, fndecl); + else + cp_warning ("%s of negative value `%E' to `%T'", + errtype, rhs, type); + } + overflow_warning (rhs); + if (TREE_CONSTANT (rhs)) + rhs = fold (rhs); + } + + return convert_and_check (type, rhs); + } + /* Conversions involving enums. */ + else if ((codel == ENUMERAL_TYPE + && (coder == ENUMERAL_TYPE || coder == INTEGER_TYPE || coder == REAL_TYPE)) + || (coder == ENUMERAL_TYPE + && (codel == ENUMERAL_TYPE || codel == INTEGER_TYPE || codel == REAL_TYPE))) + { + return convert (type, rhs); + } + /* Conversions among pointers */ + else if (codel == POINTER_TYPE + && (coder == POINTER_TYPE + || (coder == RECORD_TYPE + && (IS_SIGNATURE_POINTER (rhstype) + || IS_SIGNATURE_REFERENCE (rhstype))))) + { + register tree ttl = TREE_TYPE (type); + register tree ttr; + + if (coder == RECORD_TYPE) + { + rhs = build_optr_ref (rhs); + rhstype = TREE_TYPE (rhs); + } + ttr = TREE_TYPE (rhstype); + + /* If both pointers are of aggregate type, then we + can give better error messages, and save some work + as well. */ + if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE) + { + tree binfo; + + if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr) + || type == class_star_type_node + || rhstype == class_star_type_node) + binfo = TYPE_BINFO (ttl); + else + binfo = get_binfo (ttl, ttr, 1); + + if (binfo == error_mark_node) + return error_mark_node; + if (binfo == 0) + return error_not_base_type (ttl, ttr); + + if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards const", + errtype, type, rhstype); + } + if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards volatile", + errtype, type, rhstype); + } + } + + /* Any non-function converts to a [const][volatile] void * + and vice versa; otherwise, targets must be the same. + Meanwhile, the lhs target must have all the qualifiers of the rhs. */ + else if (TYPE_MAIN_VARIANT (ttl) == void_type_node + || TYPE_MAIN_VARIANT (ttr) == void_type_node + || comp_target_types (type, rhstype, 1) + || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) + == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) + { + /* ARM $4.8, commentary on p39. */ + if (TYPE_MAIN_VARIANT (ttl) == void_type_node + && TREE_CODE (ttr) == OFFSET_TYPE) + { + error ("no standard conversion from pointer to member to `void *'"); + return error_mark_node; + } + + if (TYPE_MAIN_VARIANT (ttl) != void_type_node + && TYPE_MAIN_VARIANT (ttr) == void_type_node + && rhs != null_pointer_node) + { + if (coder == RECORD_TYPE) + pedwarn ("implicit conversion of signature pointer to type `%s'", + type_as_string (type, 0)); + else + pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s", + errtype); + } + /* Const and volatile mean something different for function types, + so the usual warnings are not appropriate. */ + else if ((TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE) + || (TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE)) + { + if (TREE_CODE (ttl) == OFFSET_TYPE + && binfo_member (TYPE_OFFSET_BASETYPE (ttr), + CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl)))) + { + sorry ("%s between pointer to members converting across virtual baseclasses", errtype); + return error_mark_node; + } + else if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards const", + errtype, type, rhstype); + } + else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards volatile", + errtype, type, rhstype); + } + else if (TREE_CODE (ttl) == TREE_CODE (ttr) + && ! comp_target_types (type, rhstype, 1)) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' changes signedness", + errtype, type, rhstype); + } + } + } + else if (TREE_CODE (ttr) == OFFSET_TYPE + && TREE_CODE (ttl) != OFFSET_TYPE) + { + /* Normally, pointers to different type codes (other + than void) are not compatible, but we perform + some type instantiation if that resolves the + ambiguity of (X Y::*) and (X *). */ + + if (current_class_decl) + { + if (TREE_CODE (rhs) == INTEGER_CST) + { + rhs = build (PLUS_EXPR, build_pointer_type (TREE_TYPE (ttr)), + current_class_decl, rhs); + return convert_for_assignment (type, rhs, + errtype, fndecl, parmnum); + } + } + if (TREE_CODE (ttl) == METHOD_TYPE) + error ("%s between pointer-to-method and pointer-to-member types", + errtype); + else + error ("%s between pointer and pointer-to-member types", errtype); + return error_mark_node; + } + else + { + int add_quals = 0, const_parity = 0, volatile_parity = 0; + int left_const = 1; + int unsigned_parity; + int nptrs = 0; + + /* This code is basically a duplicate of comp_ptr_ttypes_real. */ + for (; ; ttl = TREE_TYPE (ttl), ttr = TREE_TYPE (ttr)) + { + nptrs -= 1; + const_parity |= TYPE_READONLY (ttl) < TYPE_READONLY (ttr); + volatile_parity |= TYPE_VOLATILE (ttl) < TYPE_VOLATILE (ttr); + + if (! left_const + && (TYPE_READONLY (ttl) > TYPE_READONLY (ttr) + || TYPE_VOLATILE (ttl) > TYPE_VOLATILE (ttr))) + add_quals = 1; + left_const &= TYPE_READONLY (ttl); + + if (TREE_CODE (ttl) != POINTER_TYPE) + break; + } + unsigned_parity = TREE_UNSIGNED (ttl) - TREE_UNSIGNED (ttr); + if (unsigned_parity) + { + if (TREE_UNSIGNED (ttl)) + ttr = unsigned_type (ttr); + else + ttl = unsigned_type (ttl); + } + + if (comp_target_types (ttl, ttr, nptrs)) + { + if (add_quals) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'", + errtype, type, rhstype); + } + if (const_parity) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards const", + errtype, type, rhstype); + } + if (volatile_parity) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' discards volatile", + errtype, type, rhstype); + } + if (unsigned_parity > 0) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned", + errtype, type, rhstype); + } + else if (unsigned_parity < 0) + { + if (fndecl) + cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed", + errtype, type, rhstype); + } + + /* C++ is not so friendly about converting function and + member function pointers as C. Emit warnings here. */ + if (TREE_CODE (ttl) == FUNCTION_TYPE + || TREE_CODE (ttl) == METHOD_TYPE) + if (! comptypes (ttl, ttr, 0)) + { + warning ("conflicting function types in %s:", errtype); + cp_warning ("\t`%T' != `%T'", type, rhstype); + } + } + else if (TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) + { + /* When does this happen? */ + my_friendly_abort (119); + /* Conversion of a pointer-to-member type to void *. */ + rhs = build_unary_op (ADDR_EXPR, rhs, 0); + TREE_TYPE (rhs) = type; + return rhs; + } + else if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) + { + /* When does this happen? */ + my_friendly_abort (120); + /* Conversion of a pointer-to-member type to void *. */ + rhs = build_unary_op (ADDR_EXPR, rhs, 0); + TREE_TYPE (rhs) = type; + return rhs; + } + else + { + if (fndecl) + cp_error ("passing `%T' as argument %P of `%D'", + rhstype, parmnum, fndecl); + else + cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); + return error_mark_node; + } + } + return convert (type, rhs); + } + else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) + { + /* An explicit constant 0 can convert to a pointer, + but not a 0 that results from casting or folding. */ + if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) + { + if (fndecl) + cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' lacks a cast", + errtype, type, rhstype); + return convert (type, rhs); + } + return null_pointer_node; + } + else if (codel == INTEGER_TYPE + && (coder == POINTER_TYPE + || (coder == RECORD_TYPE + && (IS_SIGNATURE_POINTER (rhstype) + || IS_SIGNATURE_REFERENCE (rhstype))))) + { + if (fndecl) + cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", + rhstype, parmnum, fndecl); + else + cp_pedwarn ("%s to `%T' from `%T' lacks a cast", + errtype, type, rhstype); + return convert (type, rhs); + } + + /* C++ */ + else if (((coder == POINTER_TYPE && TREE_CODE (rhs) == ADDR_EXPR + && TREE_CODE (rhstype) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (rhstype)) == METHOD_TYPE) + || integer_zerop (rhs) + || TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) + && TYPE_PTRMEMFUNC_P (type)) + { + /* compatible pointer to member functions. */ + return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), rhs, 0); + } + else if (codel == ERROR_MARK || coder == ERROR_MARK) + return error_mark_node; + + /* This should no longer happen. References are initialized via + `convert_for_initialization'. They should otherwise be + bashed before coming here. */ + else if (codel == REFERENCE_TYPE) + /* Force an abort. */ + my_friendly_assert (codel != REFERENCE_TYPE, 317); + else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs))) + { + tree nrhs = build1 (NOP_EXPR, type, rhs); + TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); + return nrhs; + } + else if (TYPE_HAS_CONSTRUCTOR (type) || IS_AGGR_TYPE (TREE_TYPE (rhs))) + return convert (type, rhs); + + cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); + return error_mark_node; +} + +/* Convert RHS to be of type TYPE. If EXP is non-zero, + it is the target of the initialization. + ERRTYPE is a string to use in error messages. + + Two major differences between the behavior of + `convert_for_assignment' and `convert_for_initialization' + are that references are bashed in the former, while + copied in the latter, and aggregates are assigned in + the former (operator=) while initialized in the + latter (X(X&)). + + If using constructor make sure no conversion operator exists, if one does + exist, an ambiguity exists. */ +tree +convert_for_initialization (exp, type, rhs, flags, errtype, fndecl, parmnum) + tree exp, type, rhs; + int flags; + char *errtype; + tree fndecl; + int parmnum; +{ + register enum tree_code codel = TREE_CODE (type); + register tree rhstype; + register enum tree_code coder; + + /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. + Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ + if (TREE_CODE (rhs) == NOP_EXPR + && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) + && codel != REFERENCE_TYPE) + rhs = TREE_OPERAND (rhs, 0); + + if (rhs == error_mark_node + || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) + return error_mark_node; + + if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) + { + rhs = resolve_offset_ref (rhs); + if (rhs == error_mark_node) + return error_mark_node; + rhstype = TREE_TYPE (rhs); + coder = TREE_CODE (rhstype); + } + + if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE + && TREE_CODE (type) != ARRAY_TYPE && TREE_CODE (type) != REFERENCE_TYPE) + || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) + rhs = default_conversion (rhs); + + rhstype = TREE_TYPE (rhs); + coder = TREE_CODE (rhstype); + + if (coder == UNKNOWN_TYPE) + { + rhs = instantiate_type (type, rhs, 1); + rhstype = TREE_TYPE (rhs); + coder = TREE_CODE (rhstype); + } + + if (coder == ERROR_MARK) + return error_mark_node; + +#if 0 + /* This is *not* the quick way out! It is the way to disaster. */ + if (type == rhstype) + goto converted; +#endif + + /* We accept references to incomplete types, so we can + return here before checking if RHS is of complete type. */ + + if (codel == REFERENCE_TYPE) + { + /* This should eventually happen in convert_arguments. */ + extern int warningcount, errorcount; + int savew, savee; + + if (fndecl) + savew = warningcount, savee = errorcount; + rhs = convert_to_reference (type, rhs, CONV_IMPLICIT, flags, + exp ? exp : error_mark_node); + if (fndecl) + { + if (warningcount > savew) + cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl); + else if (errorcount > savee) + cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl); + } + return rhs; + } + + rhs = require_complete_type (rhs); + if (rhs == error_mark_node) + return error_mark_node; + + if (exp != 0) exp = require_complete_type (exp); + if (exp == error_mark_node) + return error_mark_node; + + if (TREE_CODE (rhstype) == REFERENCE_TYPE) + rhstype = TREE_TYPE (rhstype); + + if (TYPE_LANG_SPECIFIC (type) + && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) + return build_signature_pointer_constructor (type, rhs); + + if (IS_AGGR_TYPE (type) && TYPE_NEEDS_CONSTRUCTING (type)) + { + if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) + { + /* This is sufficient to perform initialization. No need, + apparently, to go through X(X&) to do first-cut + initialization. Return through a TARGET_EXPR so that we get + cleanups if it is used. */ + if (TREE_CODE (rhs) == CALL_EXPR) + { + rhs = build_cplus_new (type, rhs, 0); + return rhs; + } + /* Handle the case of default parameter initialization and + initialization of static variables. */ + else if (TREE_CODE (rhs) == INDIRECT_REF && TREE_HAS_CONSTRUCTOR (rhs)) + { + my_friendly_assert (TREE_CODE (TREE_OPERAND (rhs, 0)) == CALL_EXPR, 318); + if (exp) + { + my_friendly_assert (TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) == NULL_TREE, 316); + TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) + = build_unary_op (ADDR_EXPR, exp, 0); + } + else + rhs = build_cplus_new (type, TREE_OPERAND (rhs, 0), 0); + return rhs; + } + } + if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype) + || (IS_AGGR_TYPE (rhstype) && UNIQUELY_DERIVED_FROM_P (type, rhstype))) + { + if (TYPE_HAS_INIT_REF (type)) + { + tree init = build_method_call (exp, constructor_name_full (type), + build_tree_list (NULL_TREE, rhs), + TYPE_BINFO (type), LOOKUP_NORMAL); + + if (init == error_mark_node) + return error_mark_node; + + if (exp == 0) + { + exp = build_cplus_new (type, init, 0); + return exp; + } + + return build (COMPOUND_EXPR, type, init, exp); + } + + /* ??? The following warnings are turned off because + this is another place where the default X(X&) constructor + is implemented. */ + if (TYPE_HAS_ASSIGNMENT (type)) + cp_warning ("bitwise copy: `%T' defines operator=", type); + + if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) + rhs = convert_from_reference (rhs); + if (type != rhstype) + { + tree nrhs = build1 (NOP_EXPR, type, rhs); + TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); + rhs = nrhs; + } + return rhs; + } + + return convert (type, rhs); + } + + if (type == TREE_TYPE (rhs)) + { + if (TREE_READONLY_DECL_P (rhs)) + rhs = decl_constant_value (rhs); + return rhs; + } + + return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); +} + +/* Expand an ASM statement with operands, handling output operands + that are not variables or INDIRECT_REFS by transforming such + cases into cases that expand_asm_operands can handle. + + Arguments are same as for expand_asm_operands. + + We don't do default conversions on all inputs, because it can screw + up operands that are expected to be in memory. */ + +void +c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) + tree string, outputs, inputs, clobbers; + int vol; + char *filename; + int line; +{ + int noutputs = list_length (outputs); + register int i; + /* o[I] is the place that output number I should be written. */ + register tree *o = (tree *) alloca (noutputs * sizeof (tree)); + register tree tail; + + /* Record the contents of OUTPUTS before it is modified. */ + for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) + o[i] = TREE_VALUE (tail); + + /* Generate the ASM_OPERANDS insn; + store into the TREE_VALUEs of OUTPUTS some trees for + where the values were actually stored. */ + expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); + + /* Copy all the intermediate outputs into the specified outputs. */ + for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) + { + if (o[i] != TREE_VALUE (tail)) + { + expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), + const0_rtx, VOIDmode, 0); + free_temp_slots (); + } + /* Detect modification of read-only values. + (Otherwise done by build_modify_expr.) */ + else + { + tree type = TREE_TYPE (o[i]); + if (TYPE_READONLY (type) + || ((TREE_CODE (type) == RECORD_TYPE + || TREE_CODE (type) == UNION_TYPE) + && C_TYPE_FIELDS_READONLY (type))) + readonly_error (o[i], "modification by `asm'", 1); + } + } + + /* Those MODIFY_EXPRs could do autoincrements. */ + emit_queue (); +} + +/* Expand a C `return' statement. + RETVAL is the expression for what to return, + or a null pointer for `return;' with no value. + + C++: upon seeing a `return', we must call destructors on all + variables in scope which had constructors called on them. + This means that if in a destructor, the base class destructors + must be called before returning. + + The RETURN statement in C++ has initialization semantics. */ + +void +c_expand_return (retval) + tree retval; +{ + extern struct nesting *cond_stack, *loop_stack, *case_stack; + extern tree dtor_label, ctor_label; + tree result = DECL_RESULT (current_function_decl); + tree valtype = TREE_TYPE (result); + register int use_temp = 0; + int returns_value = 1; + + if (TREE_THIS_VOLATILE (current_function_decl)) + warning ("function declared `noreturn' has a `return' statement"); + + if (retval == error_mark_node) + { + current_function_returns_null = 1; + return; + } + + if (retval == NULL_TREE) + { + /* A non-named return value does not count. */ + + /* Can't just return from a destructor. */ + if (dtor_label) + { + expand_goto (dtor_label); + return; + } + + if (DECL_CONSTRUCTOR_P (current_function_decl)) + retval = current_class_decl; + else if (DECL_NAME (result) != NULL_TREE + && TREE_CODE (valtype) != VOID_TYPE) + retval = result; + else + { + current_function_returns_null = 1; + + if (valtype != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) + { + if (DECL_NAME (DECL_RESULT (current_function_decl)) == NULL_TREE) + { + pedwarn ("`return' with no value, in function returning non-void"); + /* Clear this, so finish_function won't say that we + reach the end of a non-void function (which we don't, + we gave a return!). */ + current_function_returns_null = 0; + } + } + + expand_null_return (); + return; + } + } + else if (DECL_CONSTRUCTOR_P (current_function_decl) + && retval != current_class_decl) + { + error ("return from a constructor: use `this = ...' instead"); + retval = current_class_decl; + } + + if (valtype == NULL_TREE || TREE_CODE (valtype) == VOID_TYPE) + { + current_function_returns_null = 1; + /* We do this here so we'll avoid a warning about how the function + "may or may not return a value" in finish_function. */ + returns_value = 0; + + if (retval) + pedwarn ("`return' with a value, in function returning void"); + expand_return (retval); + } + /* Add some useful error checking for C++. */ + else if (TREE_CODE (valtype) == REFERENCE_TYPE) + { + tree whats_returned; + tree tmp_result = result; + + /* Don't initialize directly into a non-BLKmode retval, since that + could lose when being inlined by another caller. (GCC can't + read the function return register in an inline function when + the return value is being ignored). */ + if (result && TYPE_MODE (TREE_TYPE (tmp_result)) != BLKmode) + tmp_result = 0; + + /* convert to reference now, so we can give error if we + return an reference to a non-lvalue. */ + retval = convert_for_initialization (tmp_result, valtype, retval, + LOOKUP_NORMAL, "return", + NULL_TREE, 0); + + /* Sort through common things to see what it is + we are returning. */ + whats_returned = retval; + if (TREE_CODE (whats_returned) == COMPOUND_EXPR) + { + whats_returned = TREE_OPERAND (whats_returned, 1); + if (TREE_CODE (whats_returned) == ADDR_EXPR) + whats_returned = TREE_OPERAND (whats_returned, 0); + } + if (TREE_CODE (whats_returned) == ADDR_EXPR) + { + whats_returned = TREE_OPERAND (whats_returned, 0); + while (TREE_CODE (whats_returned) == NEW_EXPR + || TREE_CODE (whats_returned) == TARGET_EXPR + || TREE_CODE (whats_returned) == WITH_CLEANUP_EXPR) + /* Get the target. */ + whats_returned = TREE_OPERAND (whats_returned, 0); + } + + if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned)) + { + if (TEMP_NAME_P (DECL_NAME (whats_returned))) + warning ("reference to non-lvalue returned"); + else if (! TREE_STATIC (whats_returned) + && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned))) + cp_warning_at ("reference to local variable `%D' returned", whats_returned); + } + } + else if (TREE_CODE (retval) == ADDR_EXPR) + { + tree whats_returned = TREE_OPERAND (retval, 0); + + if (TREE_CODE (whats_returned) == VAR_DECL + && DECL_NAME (whats_returned) + && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) + && !TREE_STATIC (whats_returned)) + cp_warning_at ("address of local variable `%D' returned", whats_returned); + } + + /* Now deal with possible C++ hair: + (1) Compute the return value. + (2) If there are aggregate values with destructors which + must be cleaned up, clean them (taking care + not to clobber the return value). + (3) If an X(X&) constructor is defined, the return + value must be returned via that. */ + + if (retval == result + /* Watch out for constructors, which "return" aggregates + via initialization, but which otherwise "return" a pointer. */ + || DECL_CONSTRUCTOR_P (current_function_decl)) + { + /* This is just an error--it's already been reported. */ + if (TYPE_SIZE (valtype) == NULL_TREE) + return; + + if (TYPE_MODE (valtype) != BLKmode + && any_pending_cleanups (1)) + { + retval = get_temp_regvar (valtype, retval); + use_temp = obey_regdecls; + } + } + else if (IS_AGGR_TYPE (valtype) && TYPE_NEEDS_CONSTRUCTING (valtype)) + { + /* Throw away the cleanup that `build_functional_cast' gave us. */ + if (TREE_CODE (retval) == WITH_CLEANUP_EXPR + && TREE_CODE (TREE_OPERAND (retval, 0)) == TARGET_EXPR) + retval = TREE_OPERAND (retval, 0); + expand_aggr_init (result, retval, 0); + DECL_INITIAL (result) = NULL_TREE; + retval = 0; + } + else + { + if (TYPE_MODE (valtype) == VOIDmode) + { + if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode + && warn_return_type) + warning ("return of void value in function returning non-void"); + expand_expr_stmt (retval); + retval = 0; + result = 0; + } + else if (TYPE_MODE (valtype) != BLKmode + && any_pending_cleanups (1)) + { + retval = get_temp_regvar (valtype, retval); + use_temp = obey_regdecls; + result = 0; + } + else + { + retval = convert_for_initialization (result, valtype, retval, + LOOKUP_NORMAL, + "return", NULL_TREE, 0); + DECL_INITIAL (result) = NULL_TREE; + } + if (retval == error_mark_node) + return; + } + + emit_queue (); + + if (retval != NULL_TREE + && TREE_CODE_CLASS (TREE_CODE (retval)) == 'd' + && cond_stack == 0 && loop_stack == 0 && case_stack == 0) + current_function_return_value = retval; + + if (result) + { + /* Everything's great--RETVAL is in RESULT. */ + if (original_result_rtx) + store_expr (result, original_result_rtx, 0); + else if (retval && retval != result) + { + /* Clear this out so the later call to decl_function_context + won't end up bombing on us. */ + if (DECL_CONTEXT (result) == error_mark_node) + DECL_CONTEXT (result) = NULL_TREE; + /* Here is where we finally get RETVAL into RESULT. + `expand_return' does the magic of protecting + RESULT from cleanups. */ + retval = build (INIT_EXPR, TREE_TYPE (result), result, retval); + TREE_SIDE_EFFECTS (retval) = 1; + expand_return (retval); + } + else + expand_return (result); + + use_variable (DECL_RTL (result)); + if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) + expand_goto (ctor_label); + else + expand_null_return (); + } + else + { + /* We may still need to put RETVAL into RESULT. */ + result = DECL_RESULT (current_function_decl); + if (original_result_rtx) + { + /* Here we have a named return value that went + into memory. We can compute RETVAL into that. */ + if (retval) + expand_assignment (result, retval, 0, 0); + else + store_expr (result, original_result_rtx, 0); + result = make_tree (TREE_TYPE (result), original_result_rtx); + } + else if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) + { + /* Here RETVAL is CURRENT_CLASS_DECL, so there's nothing to do. */ + expand_goto (ctor_label); + } + else if (retval) + { + /* Here is where we finally get RETVAL into RESULT. + `expand_return' does the magic of protecting + RESULT from cleanups. */ + result = build (INIT_EXPR, TREE_TYPE (result), result, retval); + TREE_SIDE_EFFECTS (result) = 1; + expand_return (result); + } + else if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode) + expand_return (result); + } + + current_function_returns_value = returns_value; +#if 0 + /* These wind up after the BARRIER, which causes problems for + expand_end_binding. What purpose were they supposed to serve? */ + if (original_result_rtx) + use_variable (original_result_rtx); + if (use_temp) + use_variable (DECL_RTL (DECL_RESULT (current_function_decl))); +#endif + + /* One way to clear out cleanups that EXPR might + generate. Note that this code will really be + dead code, but that is ok--cleanups that were + needed were handled by the magic of `return'. */ + expand_cleanups_to (NULL_TREE); +} + +/* Start a C switch statement, testing expression EXP. + Return EXP if it is valid, an error node otherwise. */ + +tree +c_expand_start_case (exp) + tree exp; +{ + tree type; + register enum tree_code code; + + /* Convert from references, etc. */ + exp = default_conversion (exp); + type = TREE_TYPE (exp); + code = TREE_CODE (type); + + if (IS_AGGR_TYPE_CODE (code)) + exp = build_type_conversion (CONVERT_EXPR, integer_type_node, exp, 1); + + if (exp == NULL_TREE) + { + error ("switch quantity not an integer"); + exp = error_mark_node; + } + type = TREE_TYPE (exp); + code = TREE_CODE (type); + + if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) + { + error ("switch quantity not an integer"); + exp = error_mark_node; + } + else + { + tree index; + + exp = default_conversion (exp); + type = TREE_TYPE (exp); + index = get_unwidened (exp, 0); + /* We can't strip a conversion from a signed type to an unsigned, + because if we did, int_fits_type_p would do the wrong thing + when checking case values for being in range, + and it's too hard to do the right thing. */ + if (TREE_UNSIGNED (TREE_TYPE (exp)) + == TREE_UNSIGNED (TREE_TYPE (index))) + exp = index; + } + + expand_start_case (1, exp, type, "switch statement"); + + return exp; +} + +/* CONSTP remembers whether or not all the intervening pointers in the `to' + type have been const. */ +int +comp_ptr_ttypes_real (to, from, constp) + tree to, from; + int constp; +{ + for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) + { + if (TREE_CODE (to) != TREE_CODE (from)) + return 0; + + if (TYPE_READONLY (from) > TYPE_READONLY (to) + || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) + return 0; + + if (! constp + && (TYPE_READONLY (to) > TYPE_READONLY (from) + || TYPE_VOLATILE (to) > TYPE_READONLY (from))) + return 0; + constp &= TYPE_READONLY (to); + + if (TREE_CODE (to) != POINTER_TYPE) + return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); + } +} + +/* When comparing, say, char ** to char const **, this function takes the + 'char *' and 'char const *'. Do not pass non-pointer types to this + function. */ +int +comp_ptr_ttypes (to, from) + tree to, from; +{ + return comp_ptr_ttypes_real (to, from, 1); +} |
