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Diffstat (limited to 'gnu/usr.bin/cc/cc1plus/search.c')
| -rw-r--r-- | gnu/usr.bin/cc/cc1plus/search.c | 3199 |
1 files changed, 3199 insertions, 0 deletions
diff --git a/gnu/usr.bin/cc/cc1plus/search.c b/gnu/usr.bin/cc/cc1plus/search.c new file mode 100644 index 0000000..c4c6a4e --- /dev/null +++ b/gnu/usr.bin/cc/cc1plus/search.c @@ -0,0 +1,3199 @@ +/* Breadth-first and depth-first routines for + searching multiple-inheritance lattice for GNU C++. + Copyright (C) 1987, 1989, 1992, 1993 Free Software Foundation, Inc. + Contributed 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. */ + +/* High-level class interface. */ + +#include "config.h" +#include "tree.h" +#include <stdio.h> +#include "cp-tree.h" +#include "obstack.h" +#include "flags.h" + +#define obstack_chunk_alloc xmalloc +#define obstack_chunk_free free + +void init_search (); +extern struct obstack *current_obstack; + +#include "stack.h" + +/* Obstack used for remembering decision points of breadth-first. */ +static struct obstack search_obstack; + +/* Methods for pushing and popping objects to and from obstacks. */ +struct stack_level * +push_stack_level (obstack, tp, size) + struct obstack *obstack; + char *tp; /* Sony NewsOS 5.0 compiler doesn't like void * here. */ + int size; +{ + struct stack_level *stack; + obstack_grow (obstack, tp, size); + stack = (struct stack_level *) ((char*)obstack_next_free (obstack) - size); + obstack_finish (obstack); + stack->obstack = obstack; + stack->first = (tree *) obstack_base (obstack); + stack->limit = obstack_room (obstack) / sizeof (tree *); + return stack; +} + +struct stack_level * +pop_stack_level (stack) + struct stack_level *stack; +{ + struct stack_level *tem = stack; + struct obstack *obstack = tem->obstack; + stack = tem->prev; + obstack_free (obstack, tem); + return stack; +} + +#define search_level stack_level +static struct search_level *search_stack; + +static tree lookup_field_1 (); +static int lookup_fnfields_1 (); +static void dfs_walk (); +static int markedp (); +static void dfs_unmark (); +static void dfs_init_vbase_pointers (); + +static tree vbase_types; +static tree vbase_decl, vbase_decl_ptr; +static tree vbase_decl_ptr_intermediate; +static tree vbase_init_result; + +/* Allocate a level of searching. */ +static struct search_level * +push_search_level (stack, obstack) + struct stack_level *stack; + struct obstack *obstack; +{ + struct search_level tem; + + tem.prev = stack; + return push_stack_level (obstack, (char *)&tem, sizeof (tem)); +} + +/* Discard a level of search allocation. */ +static struct search_level * +pop_search_level (obstack) + struct stack_level *obstack; +{ + register struct search_level *stack = pop_stack_level (obstack); + + return stack; +} + +/* Search memoization. */ +struct type_level +{ + struct stack_level base; + + /* First object allocated in obstack of entries. */ + char *entries; + + /* Number of types memoized in this context. */ + int len; + + /* Type being memoized; save this if we are saving + memoized contexts. */ + tree type; +}; + +/* Obstack used for memoizing member and member function lookup. */ + +static struct obstack type_obstack, type_obstack_entries; +static struct type_level *type_stack; +static tree _vptr_name; + +/* Make things that look like tree nodes, but allocate them + on type_obstack_entries. */ +static int my_tree_node_counter; +static tree my_tree_cons (), my_build_string (); + +extern int flag_memoize_lookups, flag_save_memoized_contexts; + +/* Variables for gathering statistics. */ +static int my_memoized_entry_counter; +static int memoized_fast_finds[2], memoized_adds[2], memoized_fast_rejects[2]; +static int memoized_fields_searched[2]; +static int n_fields_searched; +static int n_calls_lookup_field, n_calls_lookup_field_1; +static int n_calls_lookup_fnfields, n_calls_lookup_fnfields_1; +static int n_calls_get_base_type; +static int n_outer_fields_searched; +static int n_contexts_saved; + +/* Local variables to help save memoization contexts. */ +static tree prev_type_memoized; +static struct type_level *prev_type_stack; + +/* This list is used by push_class_decls to know what decls need to + be pushed into class scope. */ +static tree closed_envelopes = NULL_TREE; + +/* Allocate a level of type memoization context. */ +static struct type_level * +push_type_level (stack, obstack) + struct stack_level *stack; + struct obstack *obstack; +{ + struct type_level tem; + + tem.base.prev = stack; + + obstack_finish (&type_obstack_entries); + tem.entries = (char *) obstack_base (&type_obstack_entries); + tem.len = 0; + tem.type = NULL_TREE; + + return (struct type_level *)push_stack_level (obstack, (char *)&tem, sizeof (tem)); +} + +/* Discard a level of type memoization context. */ + +static struct type_level * +pop_type_level (stack) + struct type_level *stack; +{ + obstack_free (&type_obstack_entries, stack->entries); + return (struct type_level *)pop_stack_level ((struct stack_level *)stack); +} + +/* Make something that looks like a TREE_LIST, but + do it on the type_obstack_entries obstack. */ +static tree +my_tree_cons (purpose, value, chain) + tree purpose, value, chain; +{ + tree p = (tree)obstack_alloc (&type_obstack_entries, sizeof (struct tree_list)); + ++my_tree_node_counter; + TREE_TYPE (p) = NULL_TREE; + ((HOST_WIDE_INT *)p)[3] = 0; + TREE_SET_CODE (p, TREE_LIST); + TREE_PURPOSE (p) = purpose; + TREE_VALUE (p) = value; + TREE_CHAIN (p) = chain; + return p; +} + +static tree +my_build_string (str) + char *str; +{ + tree p = (tree)obstack_alloc (&type_obstack_entries, sizeof (struct tree_string)); + ++my_tree_node_counter; + TREE_TYPE (p) = 0; + ((int *)p)[3] = 0; + TREE_SET_CODE (p, STRING_CST); + TREE_STRING_POINTER (p) = str; + TREE_STRING_LENGTH (p) = strlen (str); + return p; +} + +/* Memoizing machinery to make searches for multiple inheritance + reasonably efficient. */ +#define MEMOIZE_HASHSIZE 8 +typedef struct memoized_entry +{ + struct memoized_entry *chain; + int uid; + tree data_members[MEMOIZE_HASHSIZE]; + tree function_members[MEMOIZE_HASHSIZE]; +} *ME; + +#define MEMOIZED_CHAIN(ENTRY) (((ME)ENTRY)->chain) +#define MEMOIZED_UID(ENTRY) (((ME)ENTRY)->uid) +#define MEMOIZED_FIELDS(ENTRY,INDEX) (((ME)ENTRY)->data_members[INDEX]) +#define MEMOIZED_FNFIELDS(ENTRY,INDEX) (((ME)ENTRY)->function_members[INDEX]) +/* The following is probably a lousy hash function. */ +#define MEMOIZED_HASH_FN(NODE) (((long)(NODE)>>4)&(MEMOIZE_HASHSIZE - 1)) + +static struct memoized_entry * +my_new_memoized_entry (chain) + struct memoized_entry *chain; +{ + struct memoized_entry *p = + (struct memoized_entry *)obstack_alloc (&type_obstack_entries, + sizeof (struct memoized_entry)); + bzero (p, sizeof (struct memoized_entry)); + MEMOIZED_CHAIN (p) = chain; + MEMOIZED_UID (p) = ++my_memoized_entry_counter; + return p; +} + +/* Make an entry in the memoized table for type TYPE + that the entry for NAME is FIELD. */ + +tree +make_memoized_table_entry (type, name, function_p) + tree type, name; + int function_p; +{ + int index = MEMOIZED_HASH_FN (name); + tree entry, *prev_entry; + + memoized_adds[function_p] += 1; + if (CLASSTYPE_MTABLE_ENTRY (type) == 0) + { + obstack_ptr_grow (&type_obstack, type); + obstack_blank (&type_obstack, sizeof (struct memoized_entry *)); + CLASSTYPE_MTABLE_ENTRY (type) = (char *)my_new_memoized_entry ((struct memoized_entry *)0); + type_stack->len++; + if (type_stack->len * 2 >= type_stack->base.limit) + my_friendly_abort (88); + } + if (function_p) + prev_entry = &MEMOIZED_FNFIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); + else + prev_entry = &MEMOIZED_FIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); + + entry = my_tree_cons (name, NULL_TREE, *prev_entry); + *prev_entry = entry; + + /* Don't know the error message to give yet. */ + TREE_TYPE (entry) = error_mark_node; + + return entry; +} + +/* When a new function or class context is entered, we build + a table of types which have been searched for members. + The table is an array (obstack) of types. When a type is + entered into the obstack, its CLASSTYPE_MTABLE_ENTRY + field is set to point to a new record, of type struct memoized_entry. + + A non-NULL TREE_TYPE of the entry contains an access control error message. + + The slots for the data members are arrays of tree nodes. + These tree nodes are lists, with the TREE_PURPOSE + of this list the known member name, and the TREE_VALUE + as the FIELD_DECL for the member. + + For member functions, the TREE_PURPOSE is again the + name of the member functions for that class, + and the TREE_VALUE of the list is a pairs + whose TREE_PURPOSE is a member functions of this name, + and whose TREE_VALUE is a list of known argument lists this + member function has been called with. The TREE_TYPE of the pair, + if non-NULL, is an error message to print. */ + +/* Tell search machinery that we are entering a new context, and + to update tables appropriately. + + TYPE is the type of the context we are entering, which can + be NULL_TREE if we are not in a class's scope. + + USE_OLD, if nonzero tries to use previous context. */ +void +push_memoized_context (type, use_old) + tree type; + int use_old; +{ + int len; + tree *tem; + + if (prev_type_stack) + { + if (use_old && prev_type_memoized == type) + { +#ifdef GATHER_STATISTICS + n_contexts_saved++; +#endif + type_stack = prev_type_stack; + prev_type_stack = 0; + + tem = &type_stack->base.first[0]; + len = type_stack->len; + while (len--) + CLASSTYPE_MTABLE_ENTRY (tem[len*2]) = (char *)tem[len*2+1]; + return; + } + /* Otherwise, need to pop old stack here. */ + type_stack = pop_type_level (prev_type_stack); + prev_type_memoized = 0; + prev_type_stack = 0; + } + + type_stack = push_type_level ((struct stack_level *)type_stack, + &type_obstack); + type_stack->type = type; +} + +/* Tell search machinery that we have left a context. + We do not currently save these contexts for later use. + If we wanted to, we could not use pop_search_level, since + poping that level allows the data we have collected to + be clobbered; a stack of obstacks would be needed. */ +void +pop_memoized_context (use_old) + int use_old; +{ + int len; + tree *tem = &type_stack->base.first[0]; + + if (! flag_save_memoized_contexts) + use_old = 0; + else if (use_old) + { + len = type_stack->len; + while (len--) + tem[len*2+1] = (tree)CLASSTYPE_MTABLE_ENTRY (tem[len*2]); + + prev_type_stack = type_stack; + prev_type_memoized = type_stack->type; + } + + if (flag_memoize_lookups) + { + len = type_stack->len; + while (len--) + CLASSTYPE_MTABLE_ENTRY (tem[len*2]) + = (char *)MEMOIZED_CHAIN (CLASSTYPE_MTABLE_ENTRY (tem[len*2])); + } + if (! use_old) + type_stack = pop_type_level (type_stack); + else + type_stack = (struct type_level *)type_stack->base.prev; +} + +#if 0 /* unused */ +/* This is the newer recursive depth first search routine. */ +/* Return non-zero if PARENT is directly derived from TYPE. By directly + we mean it's only one step up the inheritance lattice. We check this + by walking horizontally across the types that TYPE directly inherits + from, to see if PARENT is among them. This is used by get_binfo and + by compute_access. */ +static int +immediately_derived (parent, type) + tree parent, type; +{ + if (TYPE_BINFO (type)) + { + tree binfos = BINFO_BASETYPES (TYPE_BINFO (type)); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + + if (parent == BINFO_TYPE (base_binfo)) + return 1; + } + } + return 0; +} +#endif + +/* Check whether the type given in BINFO is derived from PARENT. If + it isn't, return 0. If it is, but the derivation is MI-ambiguous + AND protect != 0, emit an error message and return error_mark_node. + + Otherwise, if TYPE is derived from PARENT, return the actual base + information, unless a one of the protection violations below + occurs, in which case emit an error message and return error_mark_node. + + If PROTECT is 1, then check if access to a public field of PARENT + would be private. Also check for ambiguity. */ + +tree +get_binfo (parent, binfo, protect) + register tree parent, binfo; + int protect; +{ + tree type; + int dist; + tree rval = NULL_TREE; + + if (TREE_CODE (parent) == TREE_VEC) + parent = BINFO_TYPE (parent); + /* unions cannot participate in inheritance relationships */ + else if (TREE_CODE (parent) == UNION_TYPE) + return NULL_TREE; + else if (TREE_CODE (parent) != RECORD_TYPE) + my_friendly_abort (89); + + if (TREE_CODE (binfo) == TREE_VEC) + type = BINFO_TYPE (binfo); + else if (TREE_CODE (binfo) == RECORD_TYPE) + type = binfo; + else if (TREE_CODE (binfo) == UNION_TYPE) + return NULL_TREE; + else + my_friendly_abort (90); + + dist = get_base_distance (parent, binfo, protect, &rval); + + if (dist == -3) + { + cp_error ("fields of `%T' are inaccessible in `%T' due to private inheritance", + parent, type); + return error_mark_node; + } + else if (dist == -2 && protect) + { + cp_error ("type `%T' is ambiguous base class for type `%T'", parent, + type); + return error_mark_node; + } + + return rval; +} + +/* This is the newer depth first get_base_distance routine. */ +static int +get_base_distance_recursive (binfo, depth, is_private, basetype_path, rval, + rval_private_ptr, new_binfo_ptr, parent, path_ptr, + protect, via_virtual_ptr, via_virtual) + tree binfo, basetype_path, *new_binfo_ptr, parent, *path_ptr; + int *rval_private_ptr, depth, is_private, rval, protect, *via_virtual_ptr, + via_virtual; +{ + tree binfos; + int i, n_baselinks; + + if (BINFO_TYPE (binfo) == parent || binfo == parent) + { + if (rval == -1) + { + rval = depth; + *rval_private_ptr = is_private; + *new_binfo_ptr = binfo; + *via_virtual_ptr = via_virtual; + } + else + { + int same_object = (tree_int_cst_equal (BINFO_OFFSET (*new_binfo_ptr), + BINFO_OFFSET (binfo)) + && *via_virtual_ptr && via_virtual); + + if (*via_virtual_ptr && via_virtual==0) + { + *rval_private_ptr = is_private; + *new_binfo_ptr = binfo; + *via_virtual_ptr = via_virtual; + } + else if (same_object) + { + if (*rval_private_ptr && ! is_private) + { + *rval_private_ptr = is_private; + *new_binfo_ptr = binfo; + *via_virtual_ptr = via_virtual; + } + return rval; + } + + rval = -2; + } + return rval; + } + + binfos = BINFO_BASETYPES (binfo); + n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + depth += 1; + + /* Process base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + + /* Find any specific instance of a virtual base, when searching with + a binfo... */ + if (BINFO_MARKED (base_binfo) == 0 || TREE_CODE (parent) == TREE_VEC) + { + int via_private + = (protect + && (is_private + || (!TREE_VIA_PUBLIC (base_binfo) + && !is_friend (BINFO_TYPE (binfo), current_scope ())))); + int this_virtual = via_virtual || TREE_VIA_VIRTUAL (base_binfo); + int was; + + /* When searching for a non-virtual, we cannot mark + virtually found binfos. */ + if (! this_virtual) + SET_BINFO_MARKED (base_binfo); + +#define WATCH_VALUES(rval, via_private) (rval == -1 ? 3 : via_private) + + was = WATCH_VALUES (rval, *via_virtual_ptr); + rval = get_base_distance_recursive (base_binfo, depth, via_private, + binfo, rval, rval_private_ptr, + new_binfo_ptr, parent, path_ptr, + protect, via_virtual_ptr, + this_virtual); + /* watch for updates; only update if path is good. */ + if (path_ptr && WATCH_VALUES (rval, *via_virtual_ptr) != was) + BINFO_INHERITANCE_CHAIN (base_binfo) = binfo; + if (rval == -2 && *via_virtual_ptr == 0) + return rval; + +#undef WATCH_VALUES + + } + } + + return rval; +} + +/* Return the number of levels between type PARENT and the type given + in BINFO, following the leftmost path to PARENT not found along a + virtual path, if there are no real PARENTs (all come from virtual + base classes), then follow the leftmost path to PARENT. + + Return -1 if TYPE is not derived from PARENT. + Return -2 if PARENT is an ambiguous base class of TYPE, and PROTECT is + non-negative. + Return -3 if PARENT is private to TYPE, and PROTECT is non-zero. + + If PATH_PTR is non-NULL, then also build the list of types + from PARENT to TYPE, with TREE_VIA_VIRUAL and TREE_VIA_PUBLIC + set. + + PARENT can also be a binfo, in which case that exact parent is found + and no other. convert_pointer_to_real uses this functionality. + + If BINFO is a binfo, its BINFO_INHERITANCE_CHAIN will be left alone. */ + +int +get_base_distance (parent, binfo, protect, path_ptr) + register tree parent, binfo; + int protect; + tree *path_ptr; +{ + int rval; + int rval_private = 0; + tree type; + tree new_binfo = NULL_TREE; + int via_virtual; + int watch_access = protect; + + if (TREE_CODE (parent) != TREE_VEC) + parent = TYPE_MAIN_VARIANT (parent); + + if (TREE_CODE (binfo) == TREE_VEC) + type = BINFO_TYPE (binfo); + else if (IS_AGGR_TYPE_CODE (TREE_CODE (binfo))) + { + type = binfo; + binfo = TYPE_BINFO (type); + + if (path_ptr) + BINFO_INHERITANCE_CHAIN (binfo) = NULL_TREE; + } + else + my_friendly_abort (92); + + if (parent == type || parent == binfo) + { + /* If the distance is 0, then we don't really need + a path pointer, but we shouldn't let garbage go back. */ + if (path_ptr) + *path_ptr = binfo; + return 0; + } + + if (path_ptr) + watch_access = 1; + + rval = get_base_distance_recursive (binfo, 0, 0, NULL_TREE, -1, + &rval_private, &new_binfo, parent, + path_ptr, watch_access, &via_virtual, 0); + + dfs_walk (binfo, dfs_unmark, markedp); + + /* Access restrictions don't count if we found an ambiguous basetype. */ + if (rval == -2 && protect >= 0) + rval_private = 0; + + if (rval && protect && rval_private) + return -3; + + /* find real virtual base classes. */ + if (rval == -1 && TREE_CODE (parent) == TREE_VEC + && parent == binfo_member (BINFO_TYPE (parent), + CLASSTYPE_VBASECLASSES (type))) + { + BINFO_INHERITANCE_CHAIN (parent) = binfo; + new_binfo = parent; + rval = 1; + } + + if (path_ptr) + *path_ptr = new_binfo; + return rval; +} + +/* Search for a member with name NAME in a multiple inheritance lattice + specified by TYPE. If it does not exist, return NULL_TREE. + If the member is ambiguously referenced, return `error_mark_node'. + Otherwise, return the FIELD_DECL. */ + +/* Do a 1-level search for NAME as a member of TYPE. The caller must + figure out whether it can access this field. (Since it is only one + level, this is reasonable.) */ +static tree +lookup_field_1 (type, name) + tree type, name; +{ + register tree field = TYPE_FIELDS (type); + +#ifdef GATHER_STATISTICS + n_calls_lookup_field_1++; +#endif + while (field) + { +#ifdef GATHER_STATISTICS + n_fields_searched++; +#endif + if (DECL_NAME (field) == NULL_TREE + && TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) + { + tree temp = lookup_field_1 (TREE_TYPE (field), name); + if (temp) + return temp; + } + if (DECL_NAME (field) == name) + { + if ((TREE_CODE(field) == VAR_DECL || TREE_CODE(field) == CONST_DECL) + && DECL_ASSEMBLER_NAME (field) != NULL) + GNU_xref_ref(current_function_decl, + IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (field))); + return field; + } + field = TREE_CHAIN (field); + } + /* Not found. */ + if (name == _vptr_name) + { + /* Give the user what s/he thinks s/he wants. */ + if (TYPE_VIRTUAL_P (type)) + return CLASSTYPE_VFIELD (type); + } + return NULL_TREE; +} + +/* There are a number of cases we need to be aware of here: + current_class_type current_function_decl + * global NULL NULL + * fn-local NULL SET + * class-local SET NULL + * class->fn SET SET + * fn->class SET SET + + Those last two make life interesting. If we're in a function which is + itself inside a class, we need decls to go into the fn's decls (our + second case below). But if we're in a class and the class itself is + inside a function, we need decls to go into the decls for the class. To + achieve this last goal, we must see if, when both current_class_decl and + current_function_decl are set, the class was declared inside that + function. If so, we know to put the decls into the class's scope. */ + +tree +current_scope () +{ + if (current_function_decl == NULL_TREE) + return current_class_type; + if (current_class_type == NULL_TREE) + return current_function_decl; + if (DECL_CLASS_CONTEXT (current_function_decl) == current_class_type) + return current_function_decl; + + return current_class_type; +} + +/* Compute the access of FIELD. This is done by computing + the access available to each type in BASETYPES (which comes + as a list of [via_public/basetype] in reverse order, namely base + class before derived class). The first one which defines a + access defines the access for the field. Otherwise, the + access of the field is that which occurs normally. + + Uses global variables CURRENT_CLASS_TYPE and + CURRENT_FUNCTION_DECL to use friend relationships + if necessary. + + This will be static when lookup_fnfield comes into this file. + + access_public means that the field can be accessed by the current lexical + scope. + + access_protected means that the field cannot be accessed by the current + lexical scope because it is protected. + + access_private means that the field cannot be accessed by the current + lexical scope because it is private. */ + +#if 0 +#define PUBLIC_RETURN return (DECL_PUBLIC (field) = 1), access_public +#define PROTECTED_RETURN return (DECL_PROTECTED (field) = 1), access_protected +#define PRIVATE_RETURN return (DECL_PRIVATE (field) = 1), access_private +#else +#define PUBLIC_RETURN return access_public +#define PROTECTED_RETURN return access_protected +#define PRIVATE_RETURN return access_private +#endif + +#if 0 +/* Disabled with DECL_PUBLIC &c. */ +static tree previous_scope = NULL_TREE; +#endif + +enum access_type +compute_access (basetype_path, field) + tree basetype_path, field; +{ + enum access_type access; + tree types; + tree context; + int protected_ok, via_protected; +#if 1 + /* Replaces static decl above. */ + tree previous_scope; +#endif + int static_mem = + ((TREE_CODE (field) == FUNCTION_DECL && DECL_STATIC_FUNCTION_P (field)) + || (TREE_CODE (field) != FUNCTION_DECL && TREE_STATIC (field))); + + /* The field lives in the current class. */ + if (BINFO_TYPE (basetype_path) == current_class_type) + return access_public; + +#if 0 + /* Disabled until pushing function scope clears these out. If ever. */ + /* Make these special cases fast. */ + if (current_scope () == previous_scope) + { + if (DECL_PUBLIC (field)) + return access_public; + if (DECL_PROTECTED (field)) + return access_protected; + if (DECL_PRIVATE (field)) + return access_private; + } +#endif + + previous_scope = current_scope (); + + context = DECL_CLASS_CONTEXT (field); + if (context == NULL_TREE) + context = DECL_CONTEXT (field); + + /* Fields coming from nested anonymous unions have their DECL_CLASS_CONTEXT + slot set to the union type rather than the record type containing + the anonymous union. In this case, DECL_FIELD_CONTEXT is correct. */ + if (context && TREE_CODE (context) == UNION_TYPE + && ANON_AGGRNAME_P (TYPE_IDENTIFIER (context))) + context = DECL_FIELD_CONTEXT (field); + + /* Virtual function tables are never private. But we should know that + we are looking for this, and not even try to hide it. */ + if (DECL_NAME (field) && VFIELD_NAME_P (DECL_NAME (field)) == 1) + PUBLIC_RETURN; + + /* Member found immediately within object. */ + if (BINFO_INHERITANCE_CHAIN (basetype_path) == NULL_TREE) + { + /* Are we (or an enclosing scope) friends with the class that has + FIELD? */ + if (is_friend (context, previous_scope)) + PUBLIC_RETURN; + + /* If it's private, it's private, you letch. */ + if (TREE_PRIVATE (field)) + PRIVATE_RETURN; + + /* ARM $11.5. Member functions of a derived class can access the + non-static protected members of a base class only through a + pointer to the derived class, a reference to it, or an object + of it. Also any subsequently derived classes also have + access. */ + else if (TREE_PROTECTED (field)) + { + if (current_class_type + && static_mem + && ACCESSIBLY_DERIVED_FROM_P (context, current_class_type)) + PUBLIC_RETURN; + else + PROTECTED_RETURN; + } + else + PUBLIC_RETURN; + } + + /* must reverse more than one element */ + basetype_path = reverse_path (basetype_path); + types = basetype_path; + via_protected = 0; + access = access_default; + protected_ok = static_mem && current_class_type + && ACCESSIBLY_DERIVED_FROM_P (BINFO_TYPE (types), current_class_type); + + while (1) + { + tree member; + tree binfo = types; + tree type = BINFO_TYPE (binfo); + int private_ok = 0; + + /* Friends of a class can see protected members of its bases. + Note that classes are their own friends. */ + if (is_friend (type, previous_scope)) + { + protected_ok = 1; + private_ok = 1; + } + + member = purpose_member (type, DECL_ACCESS (field)); + if (member) + { + access = (enum access_type) TREE_VALUE (member); + break; + } + + types = BINFO_INHERITANCE_CHAIN (types); + + /* If the next type was VIA_PROTECTED, then fields of all remaining + classes past that one are *at least* protected. */ + if (types) + { + if (TREE_VIA_PROTECTED (types)) + via_protected = 1; + else if (! TREE_VIA_PUBLIC (types) && ! private_ok) + { + access = access_private; + break; + } + } + else + break; + } + reverse_path (basetype_path); + + /* No special visibilities apply. Use normal rules. */ + + if (access == access_default) + { + if (is_friend (context, previous_scope)) + access = access_public; + else if (TREE_PRIVATE (field)) + access = access_private; + else if (TREE_PROTECTED (field)) + access = access_protected; + else + access = access_public; + } + + if (access == access_public && via_protected) + access = access_protected; + + if (access == access_protected && protected_ok) + access = access_public; + +#if 0 + if (access == access_public) + DECL_PUBLIC (field) = 1; + else if (access == access_protected) + DECL_PROTECTED (field) = 1; + else if (access == access_private) + DECL_PRIVATE (field) = 1; + else my_friendly_abort (96); +#endif + return access; +} + +/* Routine to see if the sub-object denoted by the binfo PARENT can be + found as a base class and sub-object of the object denoted by + BINFO. This routine relies upon binfos not being shared, except + for binfos for virtual bases. */ +static int +is_subobject_of_p (parent, binfo) + tree parent, binfo; +{ + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + if (parent == binfo) + return 1; + + /* Process and/or queue base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + if (TREE_VIA_VIRTUAL (base_binfo)) + base_binfo = TYPE_BINFO (BINFO_TYPE (base_binfo)); + if (is_subobject_of_p (parent, base_binfo)) + return 1; + } + return 0; +} + +/* See if a one FIELD_DECL hides another. This routine is meant to + correspond to ANSI working paper Sept 17, 1992 10p4. The two + binfos given are the binfos corresponding to the particular places + the FIELD_DECLs are found. This routine relies upon binfos not + being shared, except for virtual bases. */ +static int +hides (hider_binfo, hidee_binfo) + tree hider_binfo, hidee_binfo; +{ + /* hider hides hidee, if hider has hidee as a base class and + the instance of hidee is a sub-object of hider. The first + part is always true is the second part is true. + + When hider and hidee are the same (two ways to get to the exact + same member) we consider either one as hiding the other. */ + return is_subobject_of_p (hidee_binfo, hider_binfo); +} + +/* Very similar to lookup_fnfields_1 but it ensures that at least one + function was declared inside the class given by TYPE. It really should + only return functions that match the given TYPE. */ +static int +lookup_fnfields_here (type, name) + tree type, name; +{ + int index = lookup_fnfields_1 (type, name); + tree fndecls; + + if (index <= 0) + return index; + fndecls = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); + while (fndecls) + { + if (TYPE_MAIN_VARIANT (DECL_CLASS_CONTEXT (fndecls)) + == TYPE_MAIN_VARIANT (type)) + return index; + fndecls = TREE_CHAIN (fndecls); + } + return -1; +} + +/* Look for a field named NAME in an inheritance lattice dominated by + XBASETYPE. PROTECT is zero if we can avoid computing access + information, otherwise it is 1. WANT_TYPE is 1 when we should only + return TYPE_DECLs, if no TYPE_DECL can be found return NULL_TREE. + + It was not clear what should happen if WANT_TYPE is set, and an + ambiguity is found. At least one use (lookup_name) to not see + the error. */ +tree +lookup_field (xbasetype, name, protect, want_type) + register tree xbasetype, name; + int protect, want_type; +{ + int head = 0, tail = 0; + tree rval, rval_binfo = NULL_TREE, rval_binfo_h; + tree type, basetype_chain, basetype_path; + enum access_type this_v = access_default; + tree entry, binfo, binfo_h; + enum access_type own_access = access_default; + int vbase_name_p = VBASE_NAME_P (name); + + /* rval_binfo is the binfo associated with the found member, note, + this can be set with useful information, even when rval is not + set, because it must deal with ALL members, not just non-function + members. It is used for ambiguity checking and the hidden + checks. Whereas rval is only set if a proper (not hidden) + non-function member is found. */ + + /* rval_binfo_h and binfo_h are binfo values used when we perform the + hiding checks, as virtual base classes may not be shared. The strategy + is we always go into the the binfo hierarchy owned by TYPE_BINFO of + virtual base classes, as we cross virtual base class lines. This way + we know that binfo of a virtual base class will always == itself when + found along any line. (mrs) */ + + char *errstr = 0; + + /* Set this to nonzero if we don't know how to compute + accurate error messages for access control. */ + int index = MEMOIZED_HASH_FN (name); + + /* If we are looking for a constructor in a templated type, use the + unspecialized name, as that is how we store it. */ + if (IDENTIFIER_TEMPLATE (name)) + name = constructor_name (name); + + if (TREE_CODE (xbasetype) == TREE_VEC) + { + type = BINFO_TYPE (xbasetype); + basetype_path = xbasetype; + } + else if (IS_AGGR_TYPE_CODE (TREE_CODE (xbasetype))) + { + type = xbasetype; + basetype_path = TYPE_BINFO (xbasetype); + BINFO_VIA_PUBLIC (basetype_path) = 1; + BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; + } + else my_friendly_abort (97); + + if (CLASSTYPE_MTABLE_ENTRY (type)) + { + tree tem = MEMOIZED_FIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); + + while (tem && TREE_PURPOSE (tem) != name) + { + memoized_fields_searched[0]++; + tem = TREE_CHAIN (tem); + } + if (tem) + { + if (protect && TREE_TYPE (tem)) + { + error (TREE_STRING_POINTER (TREE_TYPE (tem)), + IDENTIFIER_POINTER (name), + TYPE_NAME_STRING (DECL_FIELD_CONTEXT (TREE_VALUE (tem)))); + return error_mark_node; + } + if (TREE_VALUE (tem) == NULL_TREE) + memoized_fast_rejects[0] += 1; + else + memoized_fast_finds[0] += 1; + return TREE_VALUE (tem); + } + } + +#ifdef GATHER_STATISTICS + n_calls_lookup_field++; +#endif + if (protect && flag_memoize_lookups && ! global_bindings_p ()) + entry = make_memoized_table_entry (type, name, 0); + else + entry = 0; + + rval = lookup_field_1 (type, name); + if (rval || lookup_fnfields_here (type, name)>=0) + { + rval_binfo = basetype_path; + rval_binfo_h = rval_binfo; + } + + if (rval && TREE_CODE (rval) != TYPE_DECL && want_type) + rval = NULL_TREE; + + if (rval) + { + if (protect) + { + if (TREE_PRIVATE (rval) | TREE_PROTECTED (rval)) + this_v = compute_access (basetype_path, rval); + if (TREE_CODE (rval) == CONST_DECL) + { + if (this_v == access_private) + errstr = "enum `%D' is a private value of class `%T'"; + else if (this_v == access_protected) + errstr = "enum `%D' is a protected value of class `%T'"; + } + else + { + if (this_v == access_private) + errstr = "member `%D' is a private member of class `%T'"; + else if (this_v == access_protected) + errstr = "member `%D' is a protected member of class `%T'"; + } + } + + if (entry) + { + if (errstr) + { + /* This depends on behavior of lookup_field_1! */ + tree error_string = my_build_string (errstr); + TREE_TYPE (entry) = error_string; + } + else + { + /* Let entry know there is no problem with this access. */ + TREE_TYPE (entry) = NULL_TREE; + } + TREE_VALUE (entry) = rval; + } + + if (errstr && protect) + { + cp_error (errstr, name, type); + return error_mark_node; + } + return rval; + } + + basetype_chain = build_tree_list (NULL_TREE, basetype_path); + TREE_VIA_PUBLIC (basetype_chain) = TREE_VIA_PUBLIC (basetype_path); + TREE_VIA_PROTECTED (basetype_chain) = TREE_VIA_PROTECTED (basetype_path); + TREE_VIA_VIRTUAL (basetype_chain) = TREE_VIA_VIRTUAL (basetype_path); + + /* The ambiguity check relies upon breadth first searching. */ + + search_stack = push_search_level (search_stack, &search_obstack); + binfo = basetype_path; + binfo_h = binfo; + + while (1) + { + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + tree nval; + + /* Process and/or queue base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + if (BINFO_FIELDS_MARKED (base_binfo) == 0) + { + tree btypes; + + SET_BINFO_FIELDS_MARKED (base_binfo); + btypes = my_tree_cons (NULL_TREE, base_binfo, basetype_chain); + TREE_VIA_PUBLIC (btypes) = TREE_VIA_PUBLIC (base_binfo); + TREE_VIA_PROTECTED (btypes) = TREE_VIA_PROTECTED (base_binfo); + TREE_VIA_VIRTUAL (btypes) = TREE_VIA_VIRTUAL (base_binfo); + if (TREE_VIA_VIRTUAL (base_binfo)) + btypes = tree_cons (NULL_TREE, + TYPE_BINFO (BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i))), + btypes); + else + btypes = tree_cons (NULL_TREE, + TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i), + btypes); + obstack_ptr_grow (&search_obstack, btypes); + tail += 1; + if (tail >= search_stack->limit) + my_friendly_abort (98); + } + } + + /* Process head of queue, if one exists. */ + if (head >= tail) + break; + + basetype_chain = search_stack->first[head++]; + binfo_h = TREE_VALUE (basetype_chain); + basetype_chain = TREE_CHAIN (basetype_chain); + basetype_path = TREE_VALUE (basetype_chain); + if (TREE_CHAIN (basetype_chain)) + BINFO_INHERITANCE_CHAIN (basetype_path) = TREE_VALUE (TREE_CHAIN (basetype_chain)); + else + BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; + + binfo = basetype_path; + type = BINFO_TYPE (binfo); + + /* See if we can find NAME in TYPE. If RVAL is nonzero, + and we do find NAME in TYPE, verify that such a second + sighting is in fact legal. */ + + nval = lookup_field_1 (type, name); + + if (nval || lookup_fnfields_here (type, name)>=0) + { + if (nval && nval == rval && SHARED_MEMBER_P (nval)) + { + /* This is ok, the member found is the same [class.ambig] */ + } + else if (rval_binfo && hides (rval_binfo_h, binfo_h)) + { + /* This is ok, the member found is in rval_binfo, not + here (binfo). */ + } + else if (rval_binfo==NULL_TREE || hides (binfo_h, rval_binfo_h)) + { + /* This is ok, the member found is here (binfo), not in + rval_binfo. */ + if (nval) + { + rval = nval; + if (entry || protect) + this_v = compute_access (basetype_path, rval); + /* These may look ambiguous, but they really are not. */ + if (vbase_name_p) + break; + } + else + { + /* Undo finding it before, as something else hides it. */ + rval = NULL_TREE; + } + rval_binfo = binfo; + rval_binfo_h = binfo_h; + } + else + { + /* This is ambiguous. */ + errstr = "request for member `%D' is ambiguous"; + protect = 2; + break; + } + } + } + { + tree *tp = search_stack->first; + tree *search_tail = tp + tail; + + if (entry) + TREE_VALUE (entry) = rval; + + if (want_type && (rval == NULL_TREE || TREE_CODE (rval) != TYPE_DECL)) + { + rval = NULL_TREE; + errstr = 0; + } + + /* If this FIELD_DECL defines its own access level, deal with that. */ + if (rval && errstr == 0 + && ((protect&1) || entry) + && DECL_LANG_SPECIFIC (rval) + && DECL_ACCESS (rval)) + { + while (tp < search_tail) + { + /* If is possible for one of the derived types on the path to + have defined special access for this field. Look for such + declarations and report an error if a conflict is found. */ + enum access_type new_v; + + if (this_v != access_default) + new_v = compute_access (TREE_VALUE (TREE_CHAIN (*tp)), rval); + if (this_v != access_default && new_v != this_v) + { + errstr = "conflicting access to member `%D'"; + this_v = access_default; + } + own_access = new_v; + CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); + tp += 1; + } + } + else + { + while (tp < search_tail) + { + CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); + tp += 1; + } + } + } + search_stack = pop_search_level (search_stack); + + if (errstr == 0) + { + if (own_access == access_private) + errstr = "member `%D' declared private"; + else if (own_access == access_protected) + errstr = "member `%D' declared protected"; + else if (this_v == access_private) + errstr = TREE_PRIVATE (rval) + ? "member `%D' is private" + : "member `%D' is from private base class"; + else if (this_v == access_protected) + errstr = TREE_PROTECTED (rval) + ? "member `%D' is protected" + : "member `%D' is from protected base class"; + } + + if (entry) + { + if (errstr) + { + tree error_string = my_build_string (errstr); + /* Save error message with entry. */ + TREE_TYPE (entry) = error_string; + } + else + { + /* Mark entry as having no error string. */ + TREE_TYPE (entry) = NULL_TREE; + } + } + + if (errstr && protect) + { + cp_error (errstr, name, type); + rval = error_mark_node; + } + return rval; +} + +/* Try to find NAME inside a nested class. */ +tree +lookup_nested_field (name, complain) + tree name; + int complain; +{ + register tree t; + + tree id = NULL_TREE; + if (TREE_CHAIN (current_class_type)) + { + /* Climb our way up the nested ladder, seeing if we're trying to + modify a field in an enclosing class. If so, we should only + be able to modify if it's static. */ + for (t = TREE_CHAIN (current_class_type); + t && DECL_CONTEXT (t); + t = TREE_CHAIN (DECL_CONTEXT (t))) + { + if (TREE_CODE (DECL_CONTEXT (t)) != RECORD_TYPE) + break; + + /* N.B.: lookup_field will do the access checking for us */ + id = lookup_field (DECL_CONTEXT (t), name, complain, 0); + if (id == error_mark_node) + { + id = NULL_TREE; + continue; + } + + if (id != NULL_TREE) + { + if (TREE_CODE (id) == FIELD_DECL + && ! TREE_STATIC (id) + && TREE_TYPE (id) != error_mark_node) + { + if (complain) + { + /* At parse time, we don't want to give this error, since + we won't have enough state to make this kind of + decision properly. But there are times (e.g., with + enums in nested classes) when we do need to call + this fn at parse time. So, in those cases, we pass + complain as a 0 and just return a NULL_TREE. */ + error ("assignment to non-static member `%s' of enclosing class `%s'", + lang_printable_name (id), + IDENTIFIER_POINTER (TYPE_IDENTIFIER + (DECL_CONTEXT (t)))); + /* Mark this for do_identifier(). It would otherwise + claim that the variable was undeclared. */ + TREE_TYPE (id) = error_mark_node; + } + else + { + id = NULL_TREE; + continue; + } + } + break; + } + } + } + + return id; +} + +/* TYPE is a class type. Return the index of the fields within + the method vector with name NAME, or -1 is no such field exists. */ +static int +lookup_fnfields_1 (type, name) + tree type, name; +{ + register tree method_vec = CLASSTYPE_METHOD_VEC (type); + + if (method_vec != 0) + { + register tree *methods = &TREE_VEC_ELT (method_vec, 0); + register tree *end = TREE_VEC_END (method_vec); + +#ifdef GATHER_STATISTICS + n_calls_lookup_fnfields_1++; +#endif + if (*methods && name == constructor_name (type)) + return 0; + + while (++methods != end) + { +#ifdef GATHER_STATISTICS + n_outer_fields_searched++; +#endif + if (DECL_NAME (*methods) == name) + break; + } + if (methods != end) + return methods - &TREE_VEC_ELT (method_vec, 0); + } + + return -1; +} + +/* Starting from BASETYPE, return a TREE_BASELINK-like object + which gives the following information (in a list): + + TREE_TYPE: list of basetypes needed to get to... + TREE_VALUE: list of all functions in of given type + which have name NAME. + + No access information is computed by this function, + other then to adorn the list of basetypes with + TREE_VIA_PUBLIC. + + If there are two ways to find a name (two members), if COMPLAIN is + non-zero, then error_mark_node is returned, and an error message is + printed, otherwise, just an error_mark_node is returned. + + As a special case, is COMPLAIN is -1, we don't complain, and we + don't return error_mark_node, but rather the complete list of + virtuals. This is used by get_virtuals_named_this. */ +tree +lookup_fnfields (basetype_path, name, complain) + tree basetype_path, name; + int complain; +{ + int head = 0, tail = 0; + tree type, rval, rval_binfo = NULL_TREE, rvals = NULL_TREE, rval_binfo_h; + tree entry, binfo, basetype_chain, binfo_h; + int find_all = 0; + + /* rval_binfo is the binfo associated with the found member, note, + this can be set with useful information, even when rval is not + set, because it must deal with ALL members, not just function + members. It is used for ambiguity checking and the hidden + checks. Whereas rval is only set if a proper (not hidden) + function member is found. */ + + /* rval_binfo_h and binfo_h are binfo values used when we perform the + hiding checks, as virtual base classes may not be shared. The strategy + is we always go into the the binfo hierarchy owned by TYPE_BINFO of + virtual base classes, as we cross virtual base class lines. This way + we know that binfo of a virtual base class will always == itself when + found along any line. (mrs) */ + + /* For now, don't try this. */ + int protect = complain; + + char *errstr = 0; + + /* Set this to nonzero if we don't know how to compute + accurate error messages for access control. */ + int index = MEMOIZED_HASH_FN (name); + + if (complain == -1) + { + find_all = 1; + protect = complain = 0; + } + + /* If we are looking for a constructor in a templated type, use the + unspecialized name, as that is how we store it. */ + if (IDENTIFIER_TEMPLATE (name)) + name = constructor_name (name); + + binfo = basetype_path; + binfo_h = binfo; + type = BINFO_TYPE (basetype_path); + + /* The memoization code is in need of maintenance. */ + if (!find_all && CLASSTYPE_MTABLE_ENTRY (type)) + { + tree tem = MEMOIZED_FNFIELDS (CLASSTYPE_MTABLE_ENTRY (type), index); + + while (tem && TREE_PURPOSE (tem) != name) + { + memoized_fields_searched[1]++; + tem = TREE_CHAIN (tem); + } + if (tem) + { + if (protect && TREE_TYPE (tem)) + { + error (TREE_STRING_POINTER (TREE_TYPE (tem)), + IDENTIFIER_POINTER (name), + TYPE_NAME_STRING (DECL_CLASS_CONTEXT (TREE_VALUE (TREE_VALUE (tem))))); + return error_mark_node; + } + if (TREE_VALUE (tem) == NULL_TREE) + { + memoized_fast_rejects[1] += 1; + return NULL_TREE; + } + else + { + /* Want to return this, but we must make sure + that access information is consistent. */ + tree baselink = TREE_VALUE (tem); + tree memoized_basetypes = TREE_PURPOSE (baselink); + tree these_basetypes = basetype_path; + while (memoized_basetypes && these_basetypes) + { + memoized_fields_searched[1]++; + if (TREE_VALUE (memoized_basetypes) != these_basetypes) + break; + memoized_basetypes = TREE_CHAIN (memoized_basetypes); + these_basetypes = BINFO_INHERITANCE_CHAIN (these_basetypes); + } + /* The following statement is true only when both are NULL. */ + if (memoized_basetypes == these_basetypes) + { + memoized_fast_finds[1] += 1; + return TREE_VALUE (tem); + } + /* else, we must re-find this field by hand. */ + baselink = tree_cons (basetype_path, TREE_VALUE (baselink), TREE_CHAIN (baselink)); + return baselink; + } + } + } + +#ifdef GATHER_STATISTICS + n_calls_lookup_fnfields++; +#endif + if (protect && flag_memoize_lookups && ! global_bindings_p ()) + entry = make_memoized_table_entry (type, name, 1); + else + entry = 0; + + index = lookup_fnfields_here (type, name); + if (index >= 0 || lookup_field_1 (type, name)) + { + rval_binfo = basetype_path; + rval_binfo_h = rval_binfo; + } + + if (index >= 0) + { + rval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); + rvals = my_tree_cons (basetype_path, rval, rvals); + if (BINFO_BASETYPES (binfo) && CLASSTYPE_BASELINK_VEC (type)) + TREE_TYPE (rvals) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); + + if (entry) + { + TREE_VALUE (entry) = rvals; + TREE_TYPE (entry) = NULL_TREE; + } + + return rvals; + } + rval = NULL_TREE; + + if (basetype_path == TYPE_BINFO (type)) + { + basetype_chain = CLASSTYPE_BINFO_AS_LIST (type); + TREE_VIA_PUBLIC (basetype_chain) = 1; + BINFO_VIA_PUBLIC (basetype_path) = 1; + BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; + } + else + { + basetype_chain = build_tree_list (NULL_TREE, basetype_path); + TREE_VIA_PUBLIC (basetype_chain) = TREE_VIA_PUBLIC (basetype_path); + TREE_VIA_PROTECTED (basetype_chain) = TREE_VIA_PROTECTED (basetype_path); + TREE_VIA_VIRTUAL (basetype_chain) = TREE_VIA_VIRTUAL (basetype_path); + } + + /* The ambiguity check relies upon breadth first searching. */ + + search_stack = push_search_level (search_stack, &search_obstack); + binfo = basetype_path; + binfo_h = binfo; + + while (1) + { + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + int index; + + /* Process and/or queue base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + if (BINFO_FIELDS_MARKED (base_binfo) == 0) + { + tree btypes; + + SET_BINFO_FIELDS_MARKED (base_binfo); + btypes = my_tree_cons (NULL_TREE, base_binfo, basetype_chain); + TREE_VIA_PUBLIC (btypes) = TREE_VIA_PUBLIC (base_binfo); + TREE_VIA_PROTECTED (btypes) = TREE_VIA_PROTECTED (base_binfo); + TREE_VIA_VIRTUAL (btypes) = TREE_VIA_VIRTUAL (base_binfo); + if (TREE_VIA_VIRTUAL (base_binfo)) + btypes = tree_cons (NULL_TREE, + TYPE_BINFO (BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i))), + btypes); + else + btypes = tree_cons (NULL_TREE, + TREE_VEC_ELT (BINFO_BASETYPES (binfo_h), i), + btypes); + obstack_ptr_grow (&search_obstack, btypes); + tail += 1; + if (tail >= search_stack->limit) + my_friendly_abort (99); + } + } + + /* Process head of queue, if one exists. */ + if (head >= tail) + break; + + basetype_chain = search_stack->first[head++]; + binfo_h = TREE_VALUE (basetype_chain); + basetype_chain = TREE_CHAIN (basetype_chain); + basetype_path = TREE_VALUE (basetype_chain); + if (TREE_CHAIN (basetype_chain)) + BINFO_INHERITANCE_CHAIN (basetype_path) = TREE_VALUE (TREE_CHAIN (basetype_chain)); + else + BINFO_INHERITANCE_CHAIN (basetype_path) = NULL_TREE; + + binfo = basetype_path; + type = BINFO_TYPE (binfo); + + /* See if we can find NAME in TYPE. If RVAL is nonzero, + and we do find NAME in TYPE, verify that such a second + sighting is in fact legal. */ + + index = lookup_fnfields_here (type, name); + + if (index >= 0 || (lookup_field_1 (type, name)!=NULL_TREE && !find_all)) + { + if (rval_binfo && !find_all && hides (rval_binfo_h, binfo_h)) + { + /* This is ok, the member found is in rval_binfo, not + here (binfo). */ + } + else if (rval_binfo==NULL_TREE || find_all || hides (binfo_h, rval_binfo_h)) + { + /* This is ok, the member found is here (binfo), not in + rval_binfo. */ + if (index >= 0) + { + rval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); + /* Note, rvals can only be previously set if find_all is + true. */ + rvals = my_tree_cons (basetype_path, rval, rvals); + if (TYPE_BINFO_BASETYPES (type) + && CLASSTYPE_BASELINK_VEC (type)) + TREE_TYPE (rvals) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); + } + else + { + /* Undo finding it before, as something else hides it. */ + rval = NULL_TREE; + rvals = NULL_TREE; + } + rval_binfo = binfo; + rval_binfo_h = binfo_h; + } + else + { + /* This is ambiguous. */ + errstr = "request for method `%D' is ambiguous"; + rvals = error_mark_node; + break; + } + } + } + { + tree *tp = search_stack->first; + tree *search_tail = tp + tail; + + while (tp < search_tail) + { + CLEAR_BINFO_FIELDS_MARKED (TREE_VALUE (TREE_CHAIN (*tp))); + tp += 1; + } + } + search_stack = pop_search_level (search_stack); + + if (entry) + { + if (errstr) + { + tree error_string = my_build_string (errstr); + /* Save error message with entry. */ + TREE_TYPE (entry) = error_string; + } + else + { + /* Mark entry as having no error string. */ + TREE_TYPE (entry) = NULL_TREE; + TREE_VALUE (entry) = rvals; + } + } + + if (errstr && protect) + { + cp_error (errstr, name); + rvals = error_mark_node; + } + + return rvals; +} + +/* BREADTH-FIRST SEARCH ROUTINES. */ + +/* Search a multiple inheritance hierarchy by breadth-first search. + + TYPE is an aggregate type, possibly in a multiple-inheritance hierarchy. + TESTFN is a function, which, if true, means that our condition has been met, + and its return value should be returned. + QFN, if non-NULL, is a predicate dictating whether the type should + even be queued. */ + +HOST_WIDE_INT +breadth_first_search (binfo, testfn, qfn) + tree binfo; + int (*testfn)(); + int (*qfn)(); +{ + int head = 0, tail = 0; + int rval = 0; + + search_stack = push_search_level (search_stack, &search_obstack); + + while (1) + { + tree binfos = BINFO_BASETYPES (binfo); + int n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + int i; + + /* Process and/or queue base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + + if (BINFO_MARKED (base_binfo) == 0 + && (qfn == 0 || (*qfn) (binfo, i))) + { + SET_BINFO_MARKED (base_binfo); + obstack_ptr_grow (&search_obstack, binfo); + obstack_ptr_grow (&search_obstack, (HOST_WIDE_INT) i); + tail += 2; + if (tail >= search_stack->limit) + my_friendly_abort (100); + } + } + /* Process head of queue, if one exists. */ + if (head >= tail) + { + rval = 0; + break; + } + + binfo = search_stack->first[head++]; + i = (HOST_WIDE_INT) search_stack->first[head++]; + if (rval = (*testfn) (binfo, i)) + break; + binfo = BINFO_BASETYPE (binfo, i); + } + { + tree *tp = search_stack->first; + tree *search_tail = tp + tail; + while (tp < search_tail) + { + tree binfo = *tp++; + int i = (HOST_WIDE_INT)(*tp++); + CLEAR_BINFO_MARKED (BINFO_BASETYPE (binfo, i)); + } + } + + search_stack = pop_search_level (search_stack); + return rval; +} + +/* Functions to use in breadth first searches. */ +typedef tree (*pft)(); +typedef int (*pfi)(); + +int tree_needs_constructor_p (binfo, i) + tree binfo; + int i; +{ + tree basetype; + my_friendly_assert (i != 0, 296); + basetype = BINFO_TYPE (BINFO_BASETYPE (binfo, i)); + return TYPE_NEEDS_CONSTRUCTING (basetype); +} + +static tree declarator; + +static tree +get_virtuals_named_this (binfo) + tree binfo; +{ + tree fields; + + fields = lookup_fnfields (binfo, declarator, -1); + /* fields cannot be error_mark_node */ + + if (fields == 0) + return 0; + + /* Get to the function decls, and return the first virtual function + with this name, if there is one. */ + while (fields) + { + tree fndecl; + + for (fndecl = TREE_VALUE (fields); fndecl; fndecl = DECL_CHAIN (fndecl)) + if (DECL_VINDEX (fndecl)) + return fields; + fields = next_baselink (fields); + } + return NULL_TREE; +} + +static tree get_virtual_destructor (binfo, i) + tree binfo; + int i; +{ + tree type = BINFO_TYPE (binfo); + if (i >= 0) + type = BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo), i)); + if (TYPE_HAS_DESTRUCTOR (type) + && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), 0))) + return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), 0); + return 0; +} + +int tree_has_any_destructor_p (binfo, i) + tree binfo; + int i; +{ + tree type = BINFO_TYPE (binfo); + if (i >= 0) + type = BINFO_TYPE (TREE_VEC_ELT (BINFO_BASETYPES (binfo), i)); + return TYPE_NEEDS_DESTRUCTOR (type); +} + +/* Given a class type TYPE, and a function decl FNDECL, look for a + virtual function in TYPE's hierarchy which FNDECL could match as a + virtual function. It doesn't matter which one we find. + + DTORP is nonzero if we are looking for a destructor. Destructors + need special treatment because they do not match by name. */ +tree +get_matching_virtual (binfo, fndecl, dtorp) + tree binfo, fndecl; + int dtorp; +{ + tree tmp = NULL_TREE; + + /* Breadth first search routines start searching basetypes + of TYPE, so we must perform first ply of search here. */ + if (dtorp) + { + if (tree_has_any_destructor_p (binfo, -1)) + tmp = get_virtual_destructor (binfo, -1); + + if (tmp) + return tmp; + + tmp = (tree) breadth_first_search (binfo, + (pfi) get_virtual_destructor, + tree_has_any_destructor_p); + return tmp; + } + else + { + tree drettype, dtypes, btypes, instptr_type; + tree basetype = DECL_CLASS_CONTEXT (fndecl); + tree baselink, best = NULL_TREE; + tree name = DECL_ASSEMBLER_NAME (fndecl); + + declarator = DECL_NAME (fndecl); + if (IDENTIFIER_VIRTUAL_P (declarator) == 0) + return NULL_TREE; + + drettype = TREE_TYPE (TREE_TYPE (fndecl)); + dtypes = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); + if (DECL_STATIC_FUNCTION_P (fndecl)) + instptr_type = NULL_TREE; + else + instptr_type = TREE_TYPE (TREE_VALUE (dtypes)); + + for (baselink = get_virtuals_named_this (binfo); + baselink; baselink = next_baselink (baselink)) + { + for (tmp = TREE_VALUE (baselink); tmp; tmp = DECL_CHAIN (tmp)) + { + if (! DECL_VINDEX (tmp)) + continue; + + btypes = TYPE_ARG_TYPES (TREE_TYPE (tmp)); + if (instptr_type == NULL_TREE) + { + if (compparms (TREE_CHAIN (btypes), dtypes, 3)) + /* Caller knows to give error in this case. */ + return tmp; + return NULL_TREE; + } + + if ((TYPE_READONLY (TREE_TYPE (TREE_VALUE (btypes))) + == TYPE_READONLY (instptr_type)) + && compparms (TREE_CHAIN (btypes), TREE_CHAIN (dtypes), 3)) + { + if (IDENTIFIER_ERROR_LOCUS (name) == NULL_TREE + && ! comptypes (TREE_TYPE (TREE_TYPE (tmp)), drettype, 1)) + { + cp_error ("conflicting return type specified for virtual function `%#D'", fndecl); + cp_error ("overriding definition as `%#D'", tmp); + SET_IDENTIFIER_ERROR_LOCUS (name, basetype); + } + break; + } + } + if (tmp) + { + best = tmp; + break; + } + } + if (best == NULL_TREE && warn_overloaded_virtual) + cp_warning_at ("conflicting specification deriving virtual function `%D'", fndecl); + + return best; + } +} + +/* Return the list of virtual functions which are abstract in type + TYPE that come from non virtual base classes. See + expand_direct_vtbls_init for the style of search we do. */ +static tree +get_abstract_virtuals_1 (binfo, do_self, abstract_virtuals) + tree binfo, abstract_virtuals; + int do_self; +{ + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + int is_not_base_vtable = + i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo)); + if (! TREE_VIA_VIRTUAL (base_binfo)) + abstract_virtuals + = get_abstract_virtuals_1 (base_binfo, is_not_base_vtable, + abstract_virtuals); + } + /* Should we use something besides CLASSTYPE_VFIELDS? */ + if (do_self && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))) + { + tree tmp = TREE_CHAIN (BINFO_VIRTUALS (binfo)); + + /* Get around dossier entry if there is one. */ + if (flag_dossier) + tmp = TREE_CHAIN (tmp); + + while (tmp) + { + tree base_pfn = FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (tmp)); + tree base_fndecl = TREE_OPERAND (base_pfn, 0); + if (DECL_ABSTRACT_VIRTUAL_P (base_fndecl)) + abstract_virtuals = tree_cons (NULL_TREE, base_fndecl, abstract_virtuals); + tmp = TREE_CHAIN (tmp); + } + } + return abstract_virtuals; +} + +/* Return the list of virtual functions which are abstract in type TYPE. + This information is cached, and so must be built on a + non-temporary obstack. */ +tree +get_abstract_virtuals (type) + tree type; +{ + tree vbases, tmp; + tree abstract_virtuals = CLASSTYPE_ABSTRACT_VIRTUALS (type); + + /* First get all from non-virtual bases. */ + abstract_virtuals + = get_abstract_virtuals_1 (TYPE_BINFO (type), 1, abstract_virtuals); + + for (vbases = CLASSTYPE_VBASECLASSES (type); vbases; vbases = TREE_CHAIN (vbases)) + { + if (! BINFO_VIRTUALS (vbases)) + continue; + + tmp = TREE_CHAIN (BINFO_VIRTUALS (vbases)); + while (tmp) + { + tree base_pfn = FNADDR_FROM_VTABLE_ENTRY (TREE_VALUE (tmp)); + tree base_fndecl = TREE_OPERAND (base_pfn, 0); + if (DECL_ABSTRACT_VIRTUAL_P (base_fndecl)) + abstract_virtuals = tree_cons (NULL_TREE, base_fndecl, abstract_virtuals); + tmp = TREE_CHAIN (tmp); + } + } + return nreverse (abstract_virtuals); +} + +/* For the type TYPE, return a list of member functions available from + base classes with name NAME. The TREE_VALUE of the list is a chain of + member functions with name NAME. The TREE_PURPOSE of the list is a + basetype, or a list of base types (in reverse order) which were + traversed to reach the chain of member functions. If we reach a base + type which provides a member function of name NAME, and which has at + most one base type itself, then we can terminate the search. */ + +tree +get_baselinks (type_as_binfo_list, type, name) + tree type_as_binfo_list; + tree type, name; +{ + int head = 0, tail = 0, index; + tree rval = 0, nval = 0; + tree basetypes = type_as_binfo_list; + tree binfo = TYPE_BINFO (type); + + search_stack = push_search_level (search_stack, &search_obstack); + + while (1) + { + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + /* Process and/or queue base types. */ + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + tree btypes; + + btypes = hash_tree_cons (TREE_VIA_PUBLIC (base_binfo), + TREE_VIA_VIRTUAL (base_binfo), + TREE_VIA_PROTECTED (base_binfo), + NULL_TREE, base_binfo, + basetypes); + obstack_ptr_grow (&search_obstack, btypes); + search_stack->first = (tree *)obstack_base (&search_obstack); + tail += 1; + } + + dont_queue: + /* Process head of queue, if one exists. */ + if (head >= tail) + break; + + basetypes = search_stack->first[head++]; + binfo = TREE_VALUE (basetypes); + type = BINFO_TYPE (binfo); + index = lookup_fnfields_1 (type, name); + if (index >= 0) + { + nval = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (type), index); + rval = hash_tree_cons (0, 0, 0, basetypes, nval, rval); + if (TYPE_BINFO_BASETYPES (type) == 0) + goto dont_queue; + else if (TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type)) == 1) + { + if (CLASSTYPE_BASELINK_VEC (type)) + TREE_TYPE (rval) = TREE_VEC_ELT (CLASSTYPE_BASELINK_VEC (type), index); + goto dont_queue; + } + } + nval = NULL_TREE; + } + + search_stack = pop_search_level (search_stack); + return rval; +} + +tree +next_baselink (baselink) + tree baselink; +{ + tree tmp = TREE_TYPE (baselink); + baselink = TREE_CHAIN (baselink); + while (tmp) + { + /* @@ does not yet add previous base types. */ + baselink = tree_cons (TREE_PURPOSE (tmp), TREE_VALUE (tmp), + baselink); + TREE_TYPE (baselink) = TREE_TYPE (tmp); + tmp = TREE_CHAIN (tmp); + } + return baselink; +} + +/* DEPTH-FIRST SEARCH ROUTINES. */ + +/* Assign unique numbers to _CLASSTYPE members of the lattice + specified by TYPE. The root nodes are marked first; the nodes + are marked depth-fisrt, left-right. */ + +static int cid; + +/* Matrix implementing a relation from CLASSTYPE X CLASSTYPE => INT. + Relation yields 1 if C1 <= C2, 0 otherwise. */ +typedef char mi_boolean; +static mi_boolean *mi_matrix; + +/* Type for which this matrix is defined. */ +static tree mi_type; + +/* Size of the matrix for indexing purposes. */ +static int mi_size; + +/* Return nonzero if class C2 derives from class C1. */ +#define BINFO_DERIVES_FROM(C1, C2) \ + ((mi_matrix+mi_size*(BINFO_CID (C1)-1))[BINFO_CID (C2)-1]) +#define TYPE_DERIVES_FROM(C1, C2) \ + ((mi_matrix+mi_size*(CLASSTYPE_CID (C1)-1))[CLASSTYPE_CID (C2)-1]) +#define BINFO_DERIVES_FROM_STAR(C) \ + (mi_matrix+(BINFO_CID (C)-1)) + +/* This routine converts a pointer to be a pointer of an immediate + base class. The normal convert_pointer_to routine would diagnose + the conversion as ambiguous, under MI code that has the base class + as an ambiguous base class. */ +static tree +convert_pointer_to_single_level (to_type, expr) + tree to_type, expr; +{ + tree binfo_of_derived; + tree last; + + binfo_of_derived = TYPE_BINFO (TREE_TYPE (TREE_TYPE (expr))); + last = get_binfo (to_type, TREE_TYPE (TREE_TYPE (expr)), 0); + BINFO_INHERITANCE_CHAIN (last) = binfo_of_derived; + BINFO_INHERITANCE_CHAIN (binfo_of_derived) = NULL_TREE; + return build_vbase_path (PLUS_EXPR, TYPE_POINTER_TO (to_type), expr, last, 1); +} + +/* The main function which implements depth first search. + + This routine has to remember the path it walked up, when + dfs_init_vbase_pointers is the work function, as otherwise there + would be no record. */ +static void +dfs_walk (binfo, fn, qfn) + tree binfo; + void (*fn)(); + int (*qfn)(); +{ + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + for (i = 0; i < n_baselinks; i++) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + + if ((*qfn)(base_binfo)) + { + if (fn == dfs_init_vbase_pointers) + { + /* When traversing an arbitrary MI hierarchy, we need to keep + a record of the path we took to get down to the final base + type, as otherwise there would be no record of it, and just + trying to blindly convert at the bottom would be ambiguous. + + The easiest way is to do the conversions one step at a time, + as we know we want the immediate base class at each step. + + The only special trick to converting one step at a time, + is that when we hit the last virtual base class, we must + use the SLOT value for it, and not use the normal convert + routine. We use the last virtual base class, as in our + implementation, we have pointers to all virtual base + classes in the base object. */ + + tree saved_vbase_decl_ptr_intermediate + = vbase_decl_ptr_intermediate; + + if (TREE_VIA_VIRTUAL (base_binfo)) + { + /* No need for the conversion here, as we know it is the + right type. */ + vbase_decl_ptr_intermediate + = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (base_binfo)); + } + else + { + vbase_decl_ptr_intermediate + = convert_pointer_to_single_level (BINFO_TYPE (base_binfo), + vbase_decl_ptr_intermediate); + } + + dfs_walk (base_binfo, fn, qfn); + + vbase_decl_ptr_intermediate = saved_vbase_decl_ptr_intermediate; + } else + dfs_walk (base_binfo, fn, qfn); + } + } + + fn (binfo); +} + +/* Predicate functions which serve for dfs_walk. */ +static int numberedp (binfo) tree binfo; +{ return BINFO_CID (binfo); } +static int unnumberedp (binfo) tree binfo; +{ return BINFO_CID (binfo) == 0; } + +static int markedp (binfo) tree binfo; +{ return BINFO_MARKED (binfo); } +static int bfs_markedp (binfo, i) tree binfo; int i; +{ return BINFO_MARKED (BINFO_BASETYPE (binfo, i)); } +static int unmarkedp (binfo) tree binfo; +{ return BINFO_MARKED (binfo) == 0; } +static int bfs_unmarkedp (binfo, i) tree binfo; int i; +{ return BINFO_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } +static int marked_vtable_pathp (binfo) tree binfo; +{ return BINFO_VTABLE_PATH_MARKED (binfo); } +static int bfs_marked_vtable_pathp (binfo, i) tree binfo; int i; +{ return BINFO_VTABLE_PATH_MARKED (BINFO_BASETYPE (binfo, i)); } +static int unmarked_vtable_pathp (binfo) tree binfo; +{ return BINFO_VTABLE_PATH_MARKED (binfo) == 0; } +static int bfs_unmarked_vtable_pathp (binfo, i) tree binfo; int i; +{ return BINFO_VTABLE_PATH_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } +static int marked_new_vtablep (binfo) tree binfo; +{ return BINFO_NEW_VTABLE_MARKED (binfo); } +static int bfs_marked_new_vtablep (binfo, i) tree binfo; int i; +{ return BINFO_NEW_VTABLE_MARKED (BINFO_BASETYPE (binfo, i)); } +static int unmarked_new_vtablep (binfo) tree binfo; +{ return BINFO_NEW_VTABLE_MARKED (binfo) == 0; } +static int bfs_unmarked_new_vtablep (binfo, i) tree binfo; int i; +{ return BINFO_NEW_VTABLE_MARKED (BINFO_BASETYPE (binfo, i)) == 0; } + +static int dfs_search_slot_nonempty_p (binfo) tree binfo; +{ return CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (binfo)) != 0; } + +static int dfs_debug_unmarkedp (binfo) tree binfo; +{ return CLASSTYPE_DEBUG_REQUESTED (BINFO_TYPE (binfo)) == 0; } + +/* The worker functions for `dfs_walk'. These do not need to + test anything (vis a vis marking) if they are paired with + a predicate function (above). */ + +/* Assign each type within the lattice a number which is unique + in the lattice. The first number assigned is 1. */ + +static void +dfs_number (binfo) + tree binfo; +{ + BINFO_CID (binfo) = ++cid; +} + +static void +dfs_unnumber (binfo) + tree binfo; +{ + BINFO_CID (binfo) = 0; +} + +static void +dfs_mark (binfo) tree binfo; +{ SET_BINFO_MARKED (binfo); } + +static void +dfs_unmark (binfo) tree binfo; +{ CLEAR_BINFO_MARKED (binfo); } + +static void +dfs_mark_vtable_path (binfo) tree binfo; +{ SET_BINFO_VTABLE_PATH_MARKED (binfo); } + +static void +dfs_unmark_vtable_path (binfo) tree binfo; +{ CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); } + +static void +dfs_mark_new_vtable (binfo) tree binfo; +{ SET_BINFO_NEW_VTABLE_MARKED (binfo); } + +static void +dfs_unmark_new_vtable (binfo) tree binfo; +{ CLEAR_BINFO_NEW_VTABLE_MARKED (binfo); } + +static void +dfs_clear_search_slot (binfo) tree binfo; +{ CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (binfo)) = 0; } + +static void +dfs_debug_mark (binfo) + tree binfo; +{ + tree t = BINFO_TYPE (binfo); + + /* Use heuristic that if there are virtual functions, + ignore until we see a non-inline virtual function. */ + tree methods = CLASSTYPE_METHOD_VEC (t); + + CLASSTYPE_DEBUG_REQUESTED (t) = 1; + + /* If interface info is known, the value of (?@@?) is correct. */ + if (methods == 0 + || CLASSTYPE_INTERFACE_KNOWN (t) + || (write_virtuals == 2 && TYPE_VIRTUAL_P (t))) + return; + + /* If debug info is requested from this context for this type, supply it. + If debug info is requested from another context for this type, + see if some third context can supply it. */ + if (current_function_decl == NULL_TREE + || DECL_CLASS_CONTEXT (current_function_decl) != t) + { + if (TREE_VEC_ELT (methods, 0)) + methods = TREE_VEC_ELT (methods, 0); + else + methods = TREE_VEC_ELT (methods, 1); + while (methods) + { + if (DECL_VINDEX (methods) + && DECL_SAVED_INSNS (methods) == 0 + && DECL_PENDING_INLINE_INFO (methods) == 0 + && DECL_ABSTRACT_VIRTUAL_P (methods) == 0) + { + /* Somebody, somewhere is going to have to define this + virtual function. When they do, they will provide + the debugging info. */ + return; + } + methods = TREE_CHAIN (methods); + } + } + /* We cannot rely on some alien method to solve our problems, + so we must write out the debug info ourselves. */ + TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = 0; + rest_of_type_compilation (t, global_bindings_p ()); +} + +/* Attach to the type of the virtual base class, the pointer to the + virtual base class, given the global pointer vbase_decl_ptr. + + We use the global vbase_types. ICK! */ +static void +dfs_find_vbases (binfo) + tree binfo; +{ + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + + for (i = n_baselinks-1; i >= 0; i--) + { + tree base_binfo = TREE_VEC_ELT (binfos, i); + + if (TREE_VIA_VIRTUAL (base_binfo) + && CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (base_binfo)) == 0) + { + tree vbase = BINFO_TYPE (base_binfo); + tree binfo = binfo_member (vbase, vbase_types); + + CLASSTYPE_SEARCH_SLOT (vbase) + = (char *) build (PLUS_EXPR, TYPE_POINTER_TO (vbase), + vbase_decl_ptr, BINFO_OFFSET (binfo)); + } + } + SET_BINFO_VTABLE_PATH_MARKED (binfo); + SET_BINFO_NEW_VTABLE_MARKED (binfo); +} + +static void +dfs_init_vbase_pointers (binfo) + tree binfo; +{ + tree type = BINFO_TYPE (binfo); + tree fields = TYPE_FIELDS (type); + tree this_vbase_ptr; + + CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); + + /* If there is a dossier, it is the first field, though perhaps from + the base class. Otherwise, the first fields are virtual base class + pointer fields. */ + if (CLASSTYPE_DOSSIER (type) && VFIELD_NAME_P (DECL_NAME (fields))) + /* Get past vtable for the object. */ + fields = TREE_CHAIN (fields); + + if (fields == NULL_TREE + || DECL_NAME (fields) == NULL_TREE + || ! VBASE_NAME_P (DECL_NAME (fields))) + return; + + this_vbase_ptr = vbase_decl_ptr_intermediate; + + if (TYPE_POINTER_TO (type) != TYPE_MAIN_VARIANT (TREE_TYPE (this_vbase_ptr))) + my_friendly_abort (125); + + while (fields && DECL_NAME (fields) + && VBASE_NAME_P (DECL_NAME (fields))) + { + tree ref = build (COMPONENT_REF, TREE_TYPE (fields), + build_indirect_ref (this_vbase_ptr, NULL_PTR), fields); + tree init = (tree)CLASSTYPE_SEARCH_SLOT (TREE_TYPE (TREE_TYPE (fields))); + vbase_init_result = tree_cons (binfo_member (TREE_TYPE (TREE_TYPE (fields)), + vbase_types), + build_modify_expr (ref, NOP_EXPR, init), + vbase_init_result); + fields = TREE_CHAIN (fields); + } +} + +/* Sometimes this needs to clear both VTABLE_PATH and NEW_VTABLE. Other + times, just NEW_VTABLE, but optimizer should make both with equal + efficiency (though it does not currently). */ +static void +dfs_clear_vbase_slots (binfo) + tree binfo; +{ + tree type = BINFO_TYPE (binfo); + CLASSTYPE_SEARCH_SLOT (type) = 0; + CLEAR_BINFO_VTABLE_PATH_MARKED (binfo); + CLEAR_BINFO_NEW_VTABLE_MARKED (binfo); +} + +tree +init_vbase_pointers (type, decl_ptr) + tree type; + tree decl_ptr; +{ + if (TYPE_USES_VIRTUAL_BASECLASSES (type)) + { + int old_flag = flag_this_is_variable; + tree binfo = TYPE_BINFO (type); + flag_this_is_variable = -2; + vbase_types = CLASSTYPE_VBASECLASSES (type); + vbase_decl_ptr = decl_ptr; + vbase_decl = build_indirect_ref (decl_ptr, NULL_PTR); + vbase_decl_ptr_intermediate = vbase_decl_ptr; + vbase_init_result = NULL_TREE; + dfs_walk (binfo, dfs_find_vbases, unmarked_vtable_pathp); + dfs_walk (binfo, dfs_init_vbase_pointers, marked_vtable_pathp); + dfs_walk (binfo, dfs_clear_vbase_slots, marked_new_vtablep); + flag_this_is_variable = old_flag; + return vbase_init_result; + } + return 0; +} + +/* Build a COMPOUND_EXPR which when expanded will generate the code + needed to initialize all the virtual function table slots of all + the virtual baseclasses. MAIN_BINFO is the binfo which determines + the virtual baseclasses to use; TYPE is the type of the object to + which the initialization applies. TRUE_EXP is the true object we + are initializing, and DECL_PTR is the pointer to the sub-object we + are initializing. + + When USE_COMPUTED_OFFSETS is non-zero, we can assume that the + object was laidout by a top-level contructor and the computed + offsets are valid to store vtables. When zero, we must store new + vtables through virtual baseclass pointers. + + We setup and use the globals: vbase_decl, vbase_decl_ptr, vbase_types + ICK! */ + +void +expand_indirect_vtbls_init (binfo, true_exp, decl_ptr, use_computed_offsets) + tree binfo; + tree true_exp, decl_ptr; + int use_computed_offsets; +{ + tree type = BINFO_TYPE (binfo); + if (TYPE_USES_VIRTUAL_BASECLASSES (type)) + { + int old_flag = flag_this_is_variable; + tree vbases = CLASSTYPE_VBASECLASSES (type); + vbase_types = vbases; + vbase_decl_ptr = true_exp ? build_unary_op (ADDR_EXPR, true_exp, 0) : decl_ptr; + vbase_decl = true_exp ? true_exp : build_indirect_ref (decl_ptr, NULL_PTR); + + if (use_computed_offsets) + { + /* This is an object of type IN_TYPE, */ + flag_this_is_variable = -2; + dfs_walk (binfo, dfs_find_vbases, unmarked_new_vtablep); + } + + /* Initialized with vtables of type TYPE. */ + for (; vbases; vbases = TREE_CHAIN (vbases)) + { + tree addr; + if (use_computed_offsets) + addr = (tree)CLASSTYPE_SEARCH_SLOT (BINFO_TYPE (vbases)); + else + { + tree vbinfo = get_binfo (TREE_TYPE (vbases), + TREE_TYPE (vbase_decl), + 0); + + /* See is we can get lucky. */ + if (TREE_VIA_VIRTUAL (vbinfo)) + addr = convert_pointer_to_real (vbinfo, vbase_decl_ptr); + else + { + /* We go through all these contortions to avoid this + call, as it will fail when the virtual base type + is ambiguous from here. We don't yet have a way + to search for and find just an instance of the + virtual base class. Searching for the binfo in + vbases won't work, as we don't have the vbase + pointer field, for all vbases in the main class, + only direct vbases. */ + addr = convert_pointer_to_real (TREE_TYPE (vbases), + vbase_decl_ptr); + if (addr == error_mark_node) + continue; + } + } + + /* Do all vtables from this virtual base. */ + /* This assumes that virtual bases can never serve as parent + binfos. (in the CLASSTPE_VFIELD_PARENT sense) */ + expand_direct_vtbls_init (vbases, TYPE_BINFO (BINFO_TYPE (vbases)), + 1, 0, addr); + } + + dfs_walk (binfo, dfs_clear_vbase_slots, marked_new_vtablep); + + flag_this_is_variable = old_flag; + } +} + +void +clear_search_slots (type) + tree type; +{ + dfs_walk (TYPE_BINFO (type), + dfs_clear_search_slot, dfs_search_slot_nonempty_p); +} + +/* get virtual base class types. + This adds type to the vbase_types list in reverse dfs order. + Ordering is very important, so don't change it. */ + +static void +dfs_get_vbase_types (binfo) + tree binfo; +{ + if (TREE_VIA_VIRTUAL (binfo) && ! BINFO_VBASE_MARKED (binfo)) + { + vbase_types = make_binfo (integer_zero_node, binfo, + BINFO_VTABLE (binfo), + BINFO_VIRTUALS (binfo), vbase_types); + TREE_VIA_VIRTUAL (vbase_types) = 1; + SET_BINFO_VBASE_MARKED (binfo); + } + SET_BINFO_MARKED (binfo); +} + +/* get a list of virtual base classes in dfs order. */ +tree +get_vbase_types (type) + tree type; +{ + tree vbases; + tree binfo; + + if (TREE_CODE (type) == TREE_VEC) + binfo = type; + else + binfo = TYPE_BINFO (type); + + vbase_types = NULL_TREE; + dfs_walk (binfo, dfs_get_vbase_types, unmarkedp); + dfs_walk (binfo, dfs_unmark, markedp); + /* Rely upon the reverse dfs ordering from dfs_get_vbase_types, and now + reverse it so that we get normal dfs ordering. */ + vbase_types = nreverse (vbase_types); + + /* unmark marked vbases */ + for (vbases = vbase_types; vbases; vbases = TREE_CHAIN (vbases)) + CLEAR_BINFO_VBASE_MARKED (vbases); + + return vbase_types; +} + +static void +dfs_record_inheritance (binfo) + tree binfo; +{ + tree binfos = BINFO_BASETYPES (binfo); + int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; + mi_boolean *derived_row = BINFO_DERIVES_FROM_STAR (binfo); + + for (i = n_baselinks-1; i >= 0; i--) + { + int j; + tree base_binfo = TREE_VEC_ELT (binfos, i); + tree baseclass = BINFO_TYPE (base_binfo); + mi_boolean *base_row = BINFO_DERIVES_FROM_STAR (base_binfo); + + /* Don't search if there's nothing there! MI_SIZE can be + zero as a result of parse errors. */ + if (TYPE_BINFO_BASETYPES (baseclass) && mi_size > 0) + for (j = mi_size*(CLASSTYPE_CID (baseclass)-1); j >= 0; j -= mi_size) + derived_row[j] |= base_row[j]; + TYPE_DERIVES_FROM (baseclass, BINFO_TYPE (binfo)) = 1; + } + + SET_BINFO_MARKED (binfo); +} + +/* Given a _CLASSTYPE node in a multiple inheritance lattice, + convert the lattice into a simple relation such that, + given to CIDs, C1 and C2, one can determine if C1 <= C2 + or C2 <= C1 or C1 <> C2. + + Once constructed, we walk the lattice depth fisrt, + applying various functions to elements as they are encountered. + + We use xmalloc here, in case we want to randomly free these tables. */ + +#define SAVE_MI_MATRIX + +void +build_mi_matrix (type) + tree type; +{ + tree binfo = TYPE_BINFO (type); + cid = 0; + +#ifdef SAVE_MI_MATRIX + if (CLASSTYPE_MI_MATRIX (type)) + { + mi_size = CLASSTYPE_N_SUPERCLASSES (type) + CLASSTYPE_N_VBASECLASSES (type); + mi_matrix = CLASSTYPE_MI_MATRIX (type); + mi_type = type; + dfs_walk (binfo, dfs_number, unnumberedp); + return; + } +#endif + + mi_size = CLASSTYPE_N_SUPERCLASSES (type) + CLASSTYPE_N_VBASECLASSES (type); + mi_matrix = (char *)xmalloc ((mi_size + 1) * (mi_size + 1)); + mi_type = type; + bzero (mi_matrix, (mi_size + 1) * (mi_size + 1)); + dfs_walk (binfo, dfs_number, unnumberedp); + dfs_walk (binfo, dfs_record_inheritance, unmarkedp); + dfs_walk (binfo, dfs_unmark, markedp); +} + +void +free_mi_matrix () +{ + dfs_walk (TYPE_BINFO (mi_type), dfs_unnumber, numberedp); + +#ifdef SAVE_MI_MATRIX + CLASSTYPE_MI_MATRIX (mi_type) = mi_matrix; +#else + free (mi_matrix); + mi_size = 0; + cid = 0; +#endif +} + +/* If we want debug info for a type TYPE, make sure all its base types + are also marked as being potentially interesting. This avoids + the problem of not writing any debug info for intermediate basetypes + that have abstract virtual functions. */ + +void +note_debug_info_needed (type) + tree type; +{ + dfs_walk (TYPE_BINFO (type), dfs_debug_mark, dfs_debug_unmarkedp); +} + +/* Subroutines of push_class_decls (). */ + +/* Add the instance variables which this class contributed to the + current class binding contour. When a redefinition occurs, + if the redefinition is strictly within a single inheritance path, + we just overwrite (in the case of a data field) or + cons (in the case of a member function) the old declaration with + the new. If the fields are not within a single inheritance path, + we must cons them in either case. + + In order to know what decls are new (stemming from the current + invocation of push_class_decls) we enclose them in an "envelope", + which is a TREE_LIST node where the TREE_PURPOSE slot contains the + new decl (or possibly a list of competing ones), the TREE_VALUE slot + points to the old value and the TREE_CHAIN slot chains together all + envelopes which needs to be "opened" in push_class_decls. Opening an + envelope means: push the old value onto the class_shadowed list, + install the new one and if it's a TYPE_DECL do the same to the + IDENTIFIER_TYPE_VALUE. Such an envelope is recognized by seeing that + the TREE_PURPOSE slot is non-null, and that it is not an identifier. + Because if it is, it could be a set of overloaded methods from an + outer scope. */ + +static void +dfs_pushdecls (binfo) + tree binfo; +{ + tree type = BINFO_TYPE (binfo); + tree fields, *methods, *end; + tree method_vec; + + for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) + { + /* Unmark so that if we are in a constructor, and then find that + this field was initialized by a base initializer, + we can emit an error message. */ + if (TREE_CODE (fields) == FIELD_DECL) + TREE_USED (fields) = 0; + + /* Recurse into anonymous unions. */ + if (DECL_NAME (fields) == NULL_TREE + && TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE) + { + dfs_pushdecls (TYPE_BINFO (TREE_TYPE (fields))); + continue; + } + +#if 0 + if (TREE_CODE (fields) != TYPE_DECL) + { + DECL_PUBLIC (fields) = 0; + DECL_PROTECTED (fields) = 0; + DECL_PRIVATE (fields) = 0; + } +#endif + + if (DECL_NAME (fields)) + { + tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (fields)); + + /* If the class value is an envelope of the kind described in + the comment above, we try to rule out possible ambiguities. + If we can't do that, keep a TREE_LIST with possibly ambiguous + decls in there. */ + if (class_value && TREE_CODE (class_value) == TREE_LIST + && TREE_PURPOSE (class_value) != NULL_TREE + && (TREE_CODE (TREE_PURPOSE (class_value)) + != IDENTIFIER_NODE)) + { + tree value = TREE_PURPOSE (class_value); + tree context; + + /* Possible ambiguity. If its defining type(s) + is (are all) derived from us, no problem. */ + if (TREE_CODE (value) != TREE_LIST) + { + context = (TREE_CODE (value) == FUNCTION_DECL + && DECL_VIRTUAL_P (value)) + ? DECL_CLASS_CONTEXT (value) + : DECL_CONTEXT (value); + + if (context && (context == type + || TYPE_DERIVES_FROM (context, type))) + value = fields; + else + value = tree_cons (NULL_TREE, fields, + build_tree_list (NULL_TREE, value)); + } + else + { + /* All children may derive from us, in which case + there is no problem. Otherwise, we have to + keep lists around of what the ambiguities might be. */ + tree values; + int problem = 0; + + for (values = value; values; values = TREE_CHAIN (values)) + { + tree sub_values = TREE_VALUE (values); + + if (TREE_CODE (sub_values) == TREE_LIST) + { + for (; sub_values; sub_values = TREE_CHAIN (sub_values)) + { + register tree list_mbr = TREE_VALUE (sub_values); + + context = (TREE_CODE (list_mbr) == FUNCTION_DECL + && DECL_VIRTUAL_P (list_mbr)) + ? DECL_CLASS_CONTEXT (list_mbr) + : DECL_CONTEXT (list_mbr); + + if (! TYPE_DERIVES_FROM (context, type)) + { + value = tree_cons (NULL_TREE, TREE_VALUE (values), value); + problem = 1; + break; + } + } + } + else + { + context = (TREE_CODE (sub_values) == FUNCTION_DECL + && DECL_VIRTUAL_P (sub_values)) + ? DECL_CLASS_CONTEXT (sub_values) + : DECL_CONTEXT (sub_values); + + if (context && ! TYPE_DERIVES_FROM (context, type)) + { + value = tree_cons (NULL_TREE, values, value); + problem = 1; + break; + } + } + } + if (! problem) value = fields; + } + + /* Mark this as a potentially ambiguous member. */ + if (TREE_CODE (value) == TREE_LIST) + { + /* Leaving TREE_TYPE blank is intentional. + We cannot use `error_mark_node' (lookup_name) + or `unknown_type_node' (all member functions use this). */ + TREE_NONLOCAL_FLAG (value) = 1; + } + + /* Put the new contents in our envelope. */ + TREE_PURPOSE (class_value) = value; + } + else + { + /* See comment above for a description of envelopes. */ + tree envelope = tree_cons (fields, class_value, + closed_envelopes); + + closed_envelopes = envelope; + IDENTIFIER_CLASS_VALUE (DECL_NAME (fields)) = envelope; + } + } + } + + method_vec = CLASSTYPE_METHOD_VEC (type); + if (method_vec != 0) + { + /* Farm out constructors and destructors. */ + methods = &TREE_VEC_ELT (method_vec, 1); + end = TREE_VEC_END (method_vec); + + /* This does not work for multiple inheritance yet. */ + while (methods != end) + { + /* This will cause lookup_name to return a pointer + to the tree_list of possible methods of this name. + If the order is a problem, we can nreverse them. */ + tree tmp; + tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)); + + if (class_value && TREE_CODE (class_value) == TREE_LIST + && TREE_PURPOSE (class_value) != NULL_TREE + && TREE_CODE (TREE_PURPOSE (class_value)) != IDENTIFIER_NODE) + { + tree old = TREE_PURPOSE (class_value); + + maybe_push_cache_obstack (); + if (TREE_CODE (old) == TREE_LIST) + tmp = tree_cons (DECL_NAME (*methods), *methods, old); + else + { + /* Only complain if we shadow something we can access. */ + if (old + && warn_shadow + && ((DECL_LANG_SPECIFIC (old) + && DECL_CLASS_CONTEXT (old) == current_class_type) + || ! TREE_PRIVATE (old))) + /* Should figure out access control more accurately. */ + { + cp_warning_at ("member `%#D' is shadowed", old); + cp_warning_at ("by member function `%#D'", *methods); + warning ("in this context"); + } + tmp = build_tree_list (DECL_NAME (*methods), *methods); + } + pop_obstacks (); + + TREE_TYPE (tmp) = unknown_type_node; +#if 0 + TREE_OVERLOADED (tmp) = DECL_OVERLOADED (*methods); +#endif + TREE_NONLOCAL_FLAG (tmp) = 1; + + /* Put the new contents in our envelope. */ + TREE_PURPOSE (class_value) = tmp; + } + else + { + maybe_push_cache_obstack (); + tmp = build_tree_list (DECL_NAME (*methods), *methods); + pop_obstacks (); + + TREE_TYPE (tmp) = unknown_type_node; +#if 0 + TREE_OVERLOADED (tmp) = DECL_OVERLOADED (*methods); +#endif + TREE_NONLOCAL_FLAG (tmp) = 1; + + /* See comment above for a description of envelopes. */ + closed_envelopes = tree_cons (tmp, class_value, + closed_envelopes); + IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)) = closed_envelopes; + } +#if 0 + tmp = *methods; + while (tmp != 0) + { + DECL_PUBLIC (tmp) = 0; + DECL_PROTECTED (tmp) = 0; + DECL_PRIVATE (tmp) = 0; + tmp = DECL_CHAIN (tmp); + } +#endif + + methods++; + } + } + SET_BINFO_MARKED (binfo); +} + +/* Consolidate unique (by name) member functions. */ +static void +dfs_compress_decls (binfo) + tree binfo; +{ + tree type = BINFO_TYPE (binfo); + tree method_vec = CLASSTYPE_METHOD_VEC (type); + + if (method_vec != 0) + { + /* Farm out constructors and destructors. */ + tree *methods = &TREE_VEC_ELT (method_vec, 1); + tree *end = TREE_VEC_END (method_vec); + + for (; methods != end; methods++) + { + /* This is known to be an envelope of the kind described before + dfs_pushdecls. */ + tree class_value = IDENTIFIER_CLASS_VALUE (DECL_NAME (*methods)); + tree tmp = TREE_PURPOSE (class_value); + + /* This was replaced in scope by somebody else. Just leave it + alone. */ + if (TREE_CODE (tmp) != TREE_LIST) + continue; + + if (TREE_CHAIN (tmp) == NULL_TREE + && TREE_VALUE (tmp) + && DECL_CHAIN (TREE_VALUE (tmp)) == NULL_TREE) + { + TREE_PURPOSE (class_value) = TREE_VALUE (tmp); + } + } + } + CLEAR_BINFO_MARKED (binfo); +} + +/* When entering the scope of a class, we cache all of the + fields that that class provides within its inheritance + lattice. Where ambiguities result, we mark them + with `error_mark_node' so that if they are encountered + without explicit qualification, we can emit an error + message. */ +void +push_class_decls (type) + tree type; +{ + tree id; + struct obstack *ambient_obstack = current_obstack; + +#if 0 + tree tags = CLASSTYPE_TAGS (type); + + while (tags) + { + tree code_type_node; + tree tag; + + switch (TREE_CODE (TREE_VALUE (tags))) + { + case ENUMERAL_TYPE: + code_type_node = enum_type_node; + break; + case RECORD_TYPE: + code_type_node = record_type_node; + break; + case CLASS_TYPE: + code_type_node = class_type_node; + break; + case UNION_TYPE: + code_type_node = union_type_node; + break; + default: + my_friendly_abort (297); + } + tag = xref_tag (code_type_node, TREE_PURPOSE (tags), + TYPE_BINFO_BASETYPE (TREE_VALUE (tags), 0), 0); +#if 0 /* not yet, should get fixed properly later */ + pushdecl (make_type_decl (TREE_PURPOSE (tags), TREE_VALUE (tags))); +#else + pushdecl (build_decl (TYPE_DECL, TREE_PURPOSE (tags), TREE_VALUE (tags))); +#endif + } +#endif + + search_stack = push_search_level (search_stack, &search_obstack); + + id = TYPE_IDENTIFIER (type); +#if 0 + if (IDENTIFIER_TEMPLATE (id) != 0) + { + tree tmpl = IDENTIFIER_TEMPLATE (id); + push_template_decls (DECL_ARGUMENTS (TREE_PURPOSE (tmpl)), + TREE_VALUE (tmpl), 1); + overload_template_name (id, 1); + } +#endif + + /* Push class fields into CLASS_VALUE scope, and mark. */ + dfs_walk (TYPE_BINFO (type), dfs_pushdecls, unmarkedp); + + /* Compress fields which have only a single entry + by a given name, and unmark. */ + dfs_walk (TYPE_BINFO (type), dfs_compress_decls, markedp); + + /* Open up all the closed envelopes and push the contained decls into + class scope. */ + while (closed_envelopes) + { + tree new = TREE_PURPOSE (closed_envelopes); + tree id; + + /* This is messy because the class value may be a *_DECL, or a + TREE_LIST of overloaded *_DECLs or even a TREE_LIST of ambiguous + *_DECLs. The name is stored at different places in these three + cases. */ + if (TREE_CODE (new) == TREE_LIST) + { + if (TREE_PURPOSE (new) != NULL_TREE) + id = TREE_PURPOSE (new); + else + { + tree node = TREE_VALUE (new); + + while (TREE_CODE (node) == TREE_LIST) + node = TREE_VALUE (node); + id = DECL_NAME (node); + } + } + else + id = DECL_NAME (new); + + /* Install the original class value in order to make + pushdecl_class_level work correctly. */ + IDENTIFIER_CLASS_VALUE (id) = TREE_VALUE (closed_envelopes); + if (TREE_CODE (new) == TREE_LIST) + push_class_level_binding (id, new); + else + pushdecl_class_level (new); + closed_envelopes = TREE_CHAIN (closed_envelopes); + } + current_obstack = ambient_obstack; +} + +/* Here's a subroutine we need because C lacks lambdas. */ +static void +dfs_unuse_fields (binfo) + tree binfo; +{ + tree type = TREE_TYPE (binfo); + tree fields; + + for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) + { + if (TREE_CODE (fields) != FIELD_DECL) + continue; + + TREE_USED (fields) = 0; + if (DECL_NAME (fields) == NULL_TREE + && TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE) + unuse_fields (TREE_TYPE (fields)); + } +} + +void +unuse_fields (type) + tree type; +{ + dfs_walk (TYPE_BINFO (type), dfs_unuse_fields, unmarkedp); +} + +void +pop_class_decls (type) + tree type; +{ + /* We haven't pushed a search level when dealing with cached classes, + so we'd better not try to pop it. */ + if (search_stack) + search_stack = pop_search_level (search_stack); +} + +void +print_search_statistics () +{ +#ifdef GATHER_STATISTICS + if (flag_memoize_lookups) + { + fprintf (stderr, "%d memoized contexts saved\n", + n_contexts_saved); + fprintf (stderr, "%d local tree nodes made\n", my_tree_node_counter); + fprintf (stderr, "%d local hash nodes made\n", my_memoized_entry_counter); + fprintf (stderr, "fields statistics:\n"); + fprintf (stderr, " memoized finds = %d; rejects = %d; (searches = %d)\n", + memoized_fast_finds[0], memoized_fast_rejects[0], + memoized_fields_searched[0]); + fprintf (stderr, " memoized_adds = %d\n", memoized_adds[0]); + fprintf (stderr, "fnfields statistics:\n"); + fprintf (stderr, " memoized finds = %d; rejects = %d; (searches = %d)\n", + memoized_fast_finds[1], memoized_fast_rejects[1], + memoized_fields_searched[1]); + fprintf (stderr, " memoized_adds = %d\n", memoized_adds[1]); + } + fprintf (stderr, "%d fields searched in %d[%d] calls to lookup_field[_1]\n", + n_fields_searched, n_calls_lookup_field, n_calls_lookup_field_1); + fprintf (stderr, "%d fnfields searched in %d calls to lookup_fnfields\n", + n_outer_fields_searched, n_calls_lookup_fnfields); + fprintf (stderr, "%d calls to get_base_type\n", n_calls_get_base_type); +#else + fprintf (stderr, "no search statistics\n"); +#endif +} + +void +init_search_processing () +{ + gcc_obstack_init (&search_obstack); + gcc_obstack_init (&type_obstack); + gcc_obstack_init (&type_obstack_entries); + + /* This gives us room to build our chains of basetypes, + whether or not we decide to memoize them. */ + type_stack = push_type_level (0, &type_obstack); + _vptr_name = get_identifier ("_vptr"); +} + +void +reinit_search_statistics () +{ + my_memoized_entry_counter = 0; + memoized_fast_finds[0] = 0; + memoized_fast_finds[1] = 0; + memoized_adds[0] = 0; + memoized_adds[1] = 0; + memoized_fast_rejects[0] = 0; + memoized_fast_rejects[1] = 0; + memoized_fields_searched[0] = 0; + memoized_fields_searched[1] = 0; + n_fields_searched = 0; + n_calls_lookup_field = 0, n_calls_lookup_field_1 = 0; + n_calls_lookup_fnfields = 0, n_calls_lookup_fnfields_1 = 0; + n_calls_get_base_type = 0; + n_outer_fields_searched = 0; + n_contexts_saved = 0; +} |
