diff options
Diffstat (limited to 'contrib/gcc/varasm.c')
| -rw-r--r-- | contrib/gcc/varasm.c | 2172 |
1 files changed, 1114 insertions, 1058 deletions
diff --git a/contrib/gcc/varasm.c b/contrib/gcc/varasm.c index dcfe381..94be2d4 100644 --- a/contrib/gcc/varasm.c +++ b/contrib/gcc/varasm.c @@ -1,6 +1,6 @@ /* Output variables, constants and external declarations, for GNU compiler. Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, - 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. + 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of GCC. @@ -36,12 +36,12 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "expr.h" #include "hard-reg-set.h" #include "regs.h" -#include "output.h" #include "real.h" +#include "output.h" #include "toplev.h" -#include "obstack.h" #include "hashtab.h" #include "c-pragma.h" +#include "c-tree.h" #include "ggc.h" #include "langhooks.h" #include "tm_p.h" @@ -65,17 +65,14 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA const char *first_global_object_name; const char *weak_global_object_name; -extern struct obstack permanent_obstack; -#define obstack_chunk_alloc xmalloc - struct addr_const; -struct constant_descriptor; +struct constant_descriptor_rtx; struct rtx_const; struct pool_constant; #define MAX_RTX_HASH_TABLE 61 -struct varasm_status +struct varasm_status GTY(()) { /* Hash facility for making memory-constants from constant rtl-expressions. It is used on RISC machines @@ -85,19 +82,18 @@ struct varasm_status This pool of constants is reinitialized for each function so each function gets its own constants-pool that comes right before it. */ - struct constant_descriptor **x_const_rtx_hash_table; - struct pool_constant **x_const_rtx_sym_hash_table; + struct constant_descriptor_rtx ** GTY ((length ("MAX_RTX_HASH_TABLE"))) + x_const_rtx_hash_table; + struct pool_constant ** GTY ((length ("MAX_RTX_HASH_TABLE"))) + x_const_rtx_sym_hash_table; /* Pointers to first and last constant in pool. */ - struct pool_constant *x_first_pool, *x_last_pool; + struct pool_constant *x_first_pool; + struct pool_constant *x_last_pool; /* Current offset in constant pool (does not include any machine-specific header). */ HOST_WIDE_INT x_pool_offset; - - /* Chain of all CONST_DOUBLE rtx's constructed for the current function. - They are chained through the CONST_DOUBLE_CHAIN. */ - rtx x_const_double_chain; }; #define const_rtx_hash_table (cfun->varasm->x_const_rtx_hash_table) @@ -105,7 +101,6 @@ struct varasm_status #define first_pool (cfun->varasm->x_first_pool) #define last_pool (cfun->varasm->x_last_pool) #define pool_offset (cfun->varasm->x_pool_offset) -#define const_double_chain (cfun->varasm->x_const_double_chain) /* Number for making the label on the next constant that is stored in memory. */ @@ -141,21 +136,18 @@ static HOST_WIDE_INT const_alias_set; static const char *strip_reg_name PARAMS ((const char *)); static int contains_pointers_p PARAMS ((tree)); static void decode_addr_const PARAMS ((tree, struct addr_const *)); -static int const_hash PARAMS ((tree)); -static int compare_constant PARAMS ((tree, - struct constant_descriptor *)); -static const unsigned char *compare_constant_1 PARAMS ((tree, const unsigned char *)); -static struct constant_descriptor *record_constant PARAMS ((tree)); -static void record_constant_1 PARAMS ((tree)); +static unsigned int const_hash PARAMS ((tree)); +static unsigned int const_hash_1 PARAMS ((tree)); +static int compare_constant PARAMS ((tree, tree)); static tree copy_constant PARAMS ((tree)); static void output_constant_def_contents PARAMS ((tree, int, int)); static void decode_rtx_const PARAMS ((enum machine_mode, rtx, struct rtx_const *)); -static int const_hash_rtx PARAMS ((enum machine_mode, rtx)); -static int compare_constant_rtx PARAMS ((enum machine_mode, rtx, - struct constant_descriptor *)); -static struct constant_descriptor *record_constant_rtx PARAMS ((enum machine_mode, - rtx)); +static unsigned int const_hash_rtx PARAMS ((enum machine_mode, rtx)); +static int compare_constant_rtx + PARAMS ((enum machine_mode, rtx, struct constant_descriptor_rtx *)); +static struct constant_descriptor_rtx * record_constant_rtx + PARAMS ((enum machine_mode, rtx)); static struct pool_constant *find_pool_constant PARAMS ((struct function *, rtx)); static void mark_constant_pool PARAMS ((void)); static void mark_constants PARAMS ((rtx)); @@ -167,6 +159,7 @@ static unsigned min_align PARAMS ((unsigned, unsigned)); static void output_constructor PARAMS ((tree, HOST_WIDE_INT, unsigned int)); static void globalize_decl PARAMS ((tree)); +static void maybe_assemble_visibility PARAMS ((tree)); static int in_named_entry_eq PARAMS ((const PTR, const PTR)); static hashval_t in_named_entry_hash PARAMS ((const PTR)); #ifdef ASM_OUTPUT_BSS @@ -178,14 +171,9 @@ static void asm_output_aligned_bss PARAMS ((FILE *, tree, const char *, int, int)); #endif #endif /* BSS_SECTION_ASM_OP */ -static void mark_pool_constant PARAMS ((struct pool_constant *)); -static void mark_const_hash_entry PARAMS ((void *)); -static int mark_const_str_htab_1 PARAMS ((void **, void *)); -static void mark_const_str_htab PARAMS ((void *)); static hashval_t const_str_htab_hash PARAMS ((const void *x)); static int const_str_htab_eq PARAMS ((const void *x, const void *y)); -static void const_str_htab_del PARAMS ((void *)); -static void asm_emit_uninitialised PARAMS ((tree, const char*, int, int)); +static bool asm_emit_uninitialised PARAMS ((tree, const char*, int, int)); static void resolve_unique_section PARAMS ((tree, int, int)); static void mark_weak PARAMS ((tree)); @@ -199,12 +187,15 @@ static enum in_section { no_section, in_text, in_data, in_named #ifdef DTORS_SECTION_ASM_OP , in_dtors #endif +#ifdef READONLY_DATA_SECTION_ASM_OP + , in_readonly_data +#endif #ifdef EXTRA_SECTIONS , EXTRA_SECTIONS #endif } in_section = no_section; -/* Return a non-zero value if DECL has a section attribute. */ +/* Return a nonzero value if DECL has a section attribute. */ #ifndef IN_NAMED_SECTION #define IN_NAMED_SECTION(DECL) \ ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \ @@ -237,12 +228,12 @@ text_section () { if (in_section != in_text) { + in_section = in_text; #ifdef TEXT_SECTION TEXT_SECTION (); #else fprintf (asm_out_file, "%s\n", TEXT_SECTION_ASM_OP); #endif - in_section = in_text; } } @@ -253,6 +244,7 @@ data_section () { if (in_section != in_data) { + in_section = in_data; if (flag_shared_data) { #ifdef SHARED_SECTION_ASM_OP @@ -263,10 +255,9 @@ data_section () } else fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP); - - in_section = in_data; } } + /* Tell assembler to ALWAYS switch to data section, in case it's not sure where it is. */ @@ -286,8 +277,17 @@ readonly_data_section () #ifdef READONLY_DATA_SECTION READONLY_DATA_SECTION (); /* Note this can call data_section. */ #else +#ifdef READONLY_DATA_SECTION_ASM_OP + if (in_section != in_readonly_data) + { + in_section = in_readonly_data; + fputs (READONLY_DATA_SECTION_ASM_OP, asm_out_file); + fputc ('\n', asm_out_file); + } +#else text_section (); #endif +#endif } /* Determine if we're in the text section. */ @@ -338,7 +338,7 @@ get_named_section_flags (section) { struct in_named_entry **slot; - slot = (struct in_named_entry**) + slot = (struct in_named_entry **) htab_find_slot_with_hash (in_named_htab, section, htab_hash_string (section), NO_INSERT); @@ -346,7 +346,7 @@ get_named_section_flags (section) } /* Returns true if the section has been declared before. Sets internal - flag on this section in in_named_hash so subsequent calls on this + flag on this section in in_named_hash so subsequent calls on this section will return false. */ bool @@ -355,15 +355,15 @@ named_section_first_declaration (name) { struct in_named_entry **slot; - slot = (struct in_named_entry**) - htab_find_slot_with_hash (in_named_htab, name, + slot = (struct in_named_entry **) + htab_find_slot_with_hash (in_named_htab, name, htab_hash_string (name), NO_INSERT); if (! (*slot)->declared) { (*slot)->declared = true; return true; } - else + else { return false; } @@ -380,7 +380,7 @@ set_named_section_flags (section, flags) { struct in_named_entry **slot, *entry; - slot = (struct in_named_entry**) + slot = (struct in_named_entry **) htab_find_slot_with_hash (in_named_htab, section, htab_hash_string (section), INSERT); entry = *slot; @@ -411,7 +411,7 @@ named_section_flags (name, flags) if (! set_named_section_flags (name, flags)) abort (); - (* targetm.asm_out.named_section) (name, flags); + (*targetm.asm_out.named_section) (name, flags); if (flags & SECTION_FORGET) in_section = no_section; @@ -467,10 +467,10 @@ resolve_unique_section (decl, reloc, flag_function_or_data_sections) int flag_function_or_data_sections; { if (DECL_SECTION_NAME (decl) == NULL_TREE + && targetm.have_named_sections && (flag_function_or_data_sections - || (targetm.have_named_sections - && DECL_ONE_ONLY (decl)))) - UNIQUE_SECTION (decl, reloc); + || DECL_ONE_ONLY (decl))) + (*targetm.asm_out.unique_section) (decl, reloc); } #ifdef BSS_SECTION_ASM_OP @@ -507,7 +507,7 @@ asm_output_bss (file, decl, name, size, rounded) const char *name; int size ATTRIBUTE_UNUSED, rounded; { - ASM_GLOBALIZE_LABEL (file, name); + (*targetm.asm_out.globalize_label) (file, name); bss_section (); #ifdef ASM_DECLARE_OBJECT_NAME last_assemble_variable_decl = decl; @@ -568,9 +568,8 @@ function_section (decl) text_section (); } -/* Switch to section for variable DECL. - - RELOC is the `reloc' argument to SELECT_SECTION. */ +/* Switch to section for variable DECL. RELOC is the same as the + argument to SELECT_SECTION. */ void variable_section (decl, reloc) @@ -580,52 +579,16 @@ variable_section (decl, reloc) if (IN_NAMED_SECTION (decl)) named_section (decl, NULL, reloc); else - { - /* C++ can have const variables that get initialized from constructors, - and thus can not be in a readonly section. We prevent this by - verifying that the initial value is constant for objects put in a - readonly section. - - error_mark_node is used by the C front end to indicate that the - initializer has not been seen yet. In this case, we assume that - the initializer must be constant. - - C++ uses error_mark_node for variables that have complicated - initializers, but these variables go in BSS so we won't be called - for them. */ - -#ifdef SELECT_SECTION - SELECT_SECTION (decl, reloc, DECL_ALIGN (decl)); -#else - if (DECL_READONLY_SECTION (decl, reloc)) - readonly_data_section (); - else - data_section (); -#endif - } -} - -/* Tell assembler to switch to the section for the exception handling - table. */ - -void -default_exception_section () -{ - if (targetm.have_named_sections) - named_section (NULL_TREE, ".gcc_except_table", 0); - else if (flag_pic) - data_section (); - else - readonly_data_section (); + (*targetm.asm_out.select_section) (decl, reloc, DECL_ALIGN (decl)); } /* Tell assembler to switch to the section for string merging. */ void mergeable_string_section (decl, align, flags) - tree decl ATTRIBUTE_UNUSED; - unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; - unsigned int flags ATTRIBUTE_UNUSED; + tree decl ATTRIBUTE_UNUSED; + unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; + unsigned int flags ATTRIBUTE_UNUSED; { #ifdef HAVE_GAS_SHF_MERGE if (flag_merge_constants @@ -656,7 +619,7 @@ mergeable_string_section (decl, align, flags) for (i = 0; i < len; i += unit) { for (j = 0; j < unit; j++) - if (str [i + j] != '\0') + if (str[i + j] != '\0') break; if (j == unit) break; @@ -692,15 +655,15 @@ mergeable_string_section (decl, align, flags) } #endif readonly_data_section (); -} +} /* Tell assembler to switch to the section for constant merging. */ void mergeable_constant_section (mode, align, flags) - enum machine_mode mode ATTRIBUTE_UNUSED; - unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; - unsigned int flags ATTRIBUTE_UNUSED; + enum machine_mode mode ATTRIBUTE_UNUSED; + unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; + unsigned int flags ATTRIBUTE_UNUSED; { #ifdef HAVE_GAS_SHF_MERGE unsigned int modesize = GET_MODE_BITSIZE (mode); @@ -719,7 +682,7 @@ mergeable_constant_section (mode, align, flags) flags |= (align / 8) | SECTION_MERGE; named_section_flags (name, flags); return; - } + } #endif readonly_data_section (); } @@ -728,7 +691,7 @@ mergeable_constant_section (mode, align, flags) static const char * strip_reg_name (name) - const char *name; + const char *name; { #ifdef REGISTER_PREFIX if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX))) @@ -749,7 +712,7 @@ strip_reg_name (name) int decode_reg_name (asmspec) - const char *asmspec; + const char *asmspec; { if (asmspec != 0) { @@ -846,17 +809,15 @@ make_decl_rtl (decl, asmspec) SET_DECL_RTL (decl, adjust_address_nv (DECL_RTL (decl), DECL_MODE (decl), 0)); - /* ??? Another way to do this would be to do what halfpic.c does - and maintain a hashed table of such critters. */ - /* ??? Another way to do this would be to pass a flag bit to - ENCODE_SECTION_INFO saying whether this is a new decl or not. */ + /* ??? Another way to do this would be to maintain a hashed + table of such critters. Instead of adding stuff to a DECL + to give certain attributes to it, we could use an external + hash map from DECL to set of attributes. */ + /* Let the target reassign the RTL if it wants. This is necessary, for example, when one machine specific decl attribute overrides another. */ -#ifdef REDO_SECTION_INFO_P - if (REDO_SECTION_INFO_P (decl)) - ENCODE_SECTION_INFO (decl); -#endif + (* targetm.encode_section_info) (decl, false); return; } @@ -940,6 +901,10 @@ make_decl_rtl (decl, asmspec) && DECL_COMMON (decl)) DECL_COMMON (decl) = 0; + /* Variables can't be both common and weak. */ + if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl)) + DECL_COMMON (decl) = 0; + /* Can't use just the variable's own name for a variable whose scope is less than the whole file, unless it's a member of a local class (which will already be unambiguous). @@ -980,9 +945,7 @@ make_decl_rtl (decl, asmspec) such as that it is a function name. If the name is changed, the macro ASM_OUTPUT_LABELREF will have to know how to strip this information. */ -#ifdef ENCODE_SECTION_INFO - ENCODE_SECTION_INFO (decl); -#endif + (* targetm.encode_section_info) (decl, true); } /* Make the rtl for variable VAR be volatile. @@ -1160,7 +1123,7 @@ default_ctor_section_asm_out_constructor (symbol, priority) #endif /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with - a non-zero value if the constant pool should be output before the + a nonzero value if the constant pool should be output before the start of the function, or a zero value if the pool should output after the end of the function. The default is to put it before the start. */ @@ -1203,11 +1166,12 @@ assemble_start_function (decl, fnname) /* Handle a user-specified function alignment. Note that we still need to align to FUNCTION_BOUNDARY, as above, because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */ - if (align_functions_log > align) + if (align_functions_log > align + && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED) { #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file, - align_functions_log, align_functions-1); + align_functions_log, align_functions - 1); #else ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log); #endif @@ -1228,9 +1192,8 @@ assemble_start_function (decl, fnname) const char *p; char *name; - STRIP_NAME_ENCODING (p, fnname); - name = permalloc (strlen (p) + 1); - strcpy (name, p); + p = (* targetm.strip_name_encoding) (fnname); + name = xstrdup (p); if (! DECL_WEAK (decl) && ! DECL_ONE_ONLY (decl)) first_global_object_name = name; @@ -1239,6 +1202,8 @@ assemble_start_function (decl, fnname) } globalize_decl (decl); + + maybe_assemble_visibility (decl); } /* Do any machine/system dependent processing of the function name */ @@ -1372,10 +1337,10 @@ assemble_string (p, size) #endif #endif -static void +static bool asm_emit_uninitialised (decl, name, size, rounded) tree decl; - const char * name; + const char *name; int size ATTRIBUTE_UNUSED; int rounded ATTRIBUTE_UNUSED; { @@ -1387,13 +1352,17 @@ asm_emit_uninitialised (decl, name, size, rounded) } destination = asm_dest_local; + /* ??? We should handle .bss via select_section mechanisms rather than + via special target hooks. That would eliminate this special case. */ if (TREE_PUBLIC (decl)) { -#if defined ASM_EMIT_BSS - if (! DECL_COMMON (decl)) + if (!DECL_COMMON (decl)) +#ifdef ASM_EMIT_BSS destination = asm_dest_bss; - else +#else + return false; #endif + else destination = asm_dest_common; } @@ -1442,7 +1411,7 @@ asm_emit_uninitialised (decl, name, size, rounded) abort (); } - return; + return true; } /* Assemble everything that is needed for a variable or function declaration. @@ -1516,7 +1485,8 @@ assemble_variable (decl, top_level, at_end, dont_output_data) if (TREE_ASM_WRITTEN (decl)) return; - /* Make sure ENCODE_SECTION_INFO is invoked before we set ASM_WRITTEN. */ + /* Make sure targetm.encode_section_info is invoked before we set + ASM_WRITTEN. */ decl_rtl = DECL_RTL (decl); TREE_ASM_WRITTEN (decl) = 1; @@ -1545,9 +1515,8 @@ assemble_variable (decl, top_level, at_end, dont_output_data) const char *p; char *xname; - STRIP_NAME_ENCODING (p, name); - xname = permalloc (strlen (p) + 1); - strcpy (xname, p); + p = (* targetm.strip_name_encoding) (name); + xname = xstrdup (p); first_global_object_name = xname; } @@ -1571,7 +1540,7 @@ assemble_variable (decl, top_level, at_end, dont_output_data) { warning_with_decl (decl, "alignment of `%s' is greater than maximum object file alignment. Using %d", - MAX_OFILE_ALIGNMENT/BITS_PER_UNIT); + MAX_OFILE_ALIGNMENT/BITS_PER_UNIT); align = MAX_OFILE_ALIGNMENT; } @@ -1583,7 +1552,7 @@ assemble_variable (decl, top_level, at_end, dont_output_data) #endif #ifdef CONSTANT_ALIGNMENT if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node) - align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align); + align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align); #endif } @@ -1592,16 +1561,34 @@ assemble_variable (decl, top_level, at_end, dont_output_data) DECL_ALIGN (decl) = align; set_mem_align (decl_rtl, align); + if (TREE_PUBLIC (decl)) + maybe_assemble_visibility (decl); + + /* Output any data that we will need to use the address of. */ + if (DECL_INITIAL (decl) == error_mark_node) + reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0; + else if (DECL_INITIAL (decl)) + reloc = output_addressed_constants (DECL_INITIAL (decl)); + resolve_unique_section (decl, reloc, flag_data_sections); + /* Handle uninitialized definitions. */ - if ((DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node) - /* If the target can't output uninitialized but not common global data - in .bss, then we have to use .data. */ -#if ! defined ASM_EMIT_BSS - && DECL_COMMON (decl) -#endif - && DECL_SECTION_NAME (decl) == NULL_TREE - && ! dont_output_data) + /* If the decl has been given an explicit section name, then it + isn't common, and shouldn't be handled as such. */ + if (DECL_SECTION_NAME (decl) || dont_output_data) + ; + /* We don't implement common thread-local data at present. */ + else if (DECL_THREAD_LOCAL (decl)) + { + if (DECL_COMMON (decl)) + sorry ("thread-local COMMON data not implemented"); + } + else if (DECL_INITIAL (decl) == 0 + || DECL_INITIAL (decl) == error_mark_node + || (flag_zero_initialized_in_bss + /* Leave constant zeroes in .rodata so they can be shared. */ + && !TREE_READONLY (decl) + && initializer_zerop (DECL_INITIAL (decl)))) { unsigned HOST_WIDE_INT size = tree_low_cst (DECL_SIZE_UNIT (decl), 1); unsigned HOST_WIDE_INT rounded = size; @@ -1617,16 +1604,16 @@ assemble_variable (decl, top_level, at_end, dont_output_data) rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); -/* Don't continue this line--convex cc version 4.1 would lose. */ #if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS) if ((unsigned HOST_WIDE_INT) DECL_ALIGN (decl) / BITS_PER_UNIT > rounded) - warning_with_decl - (decl, "requested alignment for %s is greater than implemented alignment of %d",rounded); + warning_with_decl + (decl, "requested alignment for %s is greater than implemented alignment of %d",rounded); #endif - asm_emit_uninitialised (decl, name, size, rounded); - - return; + /* If the target cannot output uninitialized but not common global data + in .bss, then we have to use .data, so fall through. */ + if (asm_emit_uninitialised (decl, name, size, rounded)) + return; } /* Handle initialized definitions. @@ -1637,14 +1624,7 @@ assemble_variable (decl, top_level, at_end, dont_output_data) if (TREE_PUBLIC (decl) && DECL_NAME (decl)) globalize_decl (decl); - /* Output any data that we will need to use the address of. */ - if (DECL_INITIAL (decl) == error_mark_node) - reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0; - else if (DECL_INITIAL (decl)) - reloc = output_addressed_constants (DECL_INITIAL (decl)); - /* Switch to the appropriate section. */ - resolve_unique_section (decl, reloc, flag_data_sections); variable_section (decl, reloc); /* dbxout.c needs to know this. */ @@ -1764,15 +1744,6 @@ assemble_external_libcall (fun) #endif } -/* Declare the label NAME global. */ - -void -assemble_global (name) - const char *name ATTRIBUTE_UNUSED; -{ - ASM_GLOBALIZE_LABEL (asm_out_file, name); -} - /* Assemble a label named NAME. */ void @@ -1796,7 +1767,7 @@ assemble_name (file, name) const char *real_name; tree id; - STRIP_NAME_ENCODING (real_name, name); + real_name = (* targetm.strip_name_encoding) (name); id = maybe_get_identifier (real_name); if (id) @@ -1963,7 +1934,7 @@ default_assemble_integer (x, size, aligned_p) /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is the alignment of the integer in bits. Return 1 if we were able to output - the constant, otherwise 0. If FORCE is non-zero, abort if we can't output + the constant, otherwise 0. If FORCE is nonzero, abort if we can't output the constant. */ bool @@ -2096,202 +2067,12 @@ assemble_real (d, mode, align) } } -/* Here we combine duplicate floating constants to make - CONST_DOUBLE rtx's, and force those out to memory when necessary. */ - -/* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair of ints. - For an integer, I0 is the low-order word and I1 is the high-order word. - For a real number, I0 is the word with the low address - and I1 is the word with the high address. */ - -rtx -immed_double_const (i0, i1, mode) - HOST_WIDE_INT i0, i1; - enum machine_mode mode; -{ - rtx r; - - if (GET_MODE_CLASS (mode) == MODE_INT - || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) - { - /* We clear out all bits that don't belong in MODE, unless they and our - sign bit are all one. So we get either a reasonable negative value - or a reasonable unsigned value for this mode. */ - int width = GET_MODE_BITSIZE (mode); - if (width < HOST_BITS_PER_WIDE_INT - && ((i0 & ((HOST_WIDE_INT) (-1) << (width - 1))) - != ((HOST_WIDE_INT) (-1) << (width - 1)))) - i0 &= ((HOST_WIDE_INT) 1 << width) - 1, i1 = 0; - else if (width == HOST_BITS_PER_WIDE_INT - && ! (i1 == ~0 && i0 < 0)) - i1 = 0; - else if (width > 2 * HOST_BITS_PER_WIDE_INT) - /* We cannot represent this value as a constant. */ - abort (); - - /* If this would be an entire word for the target, but is not for - the host, then sign-extend on the host so that the number will look - the same way on the host that it would on the target. - - For example, when building a 64 bit alpha hosted 32 bit sparc - targeted compiler, then we want the 32 bit unsigned value -1 to be - represented as a 64 bit value -1, and not as 0x00000000ffffffff. - The later confuses the sparc backend. */ - - if (width < HOST_BITS_PER_WIDE_INT - && (i0 & ((HOST_WIDE_INT) 1 << (width - 1)))) - i0 |= ((HOST_WIDE_INT) (-1) << width); - - /* If MODE fits within HOST_BITS_PER_WIDE_INT, always use a CONST_INT. - - ??? Strictly speaking, this is wrong if we create a CONST_INT - for a large unsigned constant with the size of MODE being - HOST_BITS_PER_WIDE_INT and later try to interpret that constant in a - wider mode. In that case we will mis-interpret it as a negative - number. - - Unfortunately, the only alternative is to make a CONST_DOUBLE - for any constant in any mode if it is an unsigned constant larger - than the maximum signed integer in an int on the host. However, - doing this will break everyone that always expects to see a CONST_INT - for SImode and smaller. - - We have always been making CONST_INTs in this case, so nothing new - is being broken. */ - - if (width <= HOST_BITS_PER_WIDE_INT) - i1 = (i0 < 0) ? ~(HOST_WIDE_INT) 0 : 0; - - /* If this integer fits in one word, return a CONST_INT. */ - if ((i1 == 0 && i0 >= 0) - || (i1 == ~0 && i0 < 0)) - return GEN_INT (i0); - - /* We use VOIDmode for integers. */ - mode = VOIDmode; - } - - /* Search the chain for an existing CONST_DOUBLE with the right value. - If one is found, return it. */ - if (cfun != 0) - for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r)) - if (CONST_DOUBLE_LOW (r) == i0 && CONST_DOUBLE_HIGH (r) == i1 - && GET_MODE (r) == mode) - return r; - - /* No; make a new one and add it to the chain. */ - r = gen_rtx_CONST_DOUBLE (mode, i0, i1); - - /* Don't touch const_double_chain if not inside any function. */ - if (current_function_decl != 0) - { - CONST_DOUBLE_CHAIN (r) = const_double_chain; - const_double_chain = r; - } - - return r; -} - -/* Return a CONST_DOUBLE for a specified `double' value - and machine mode. */ - -rtx -immed_real_const_1 (d, mode) - REAL_VALUE_TYPE d; - enum machine_mode mode; -{ - union real_extract u; - rtx r; - - /* Get the desired `double' value as a sequence of ints - since that is how they are stored in a CONST_DOUBLE. */ - - u.d = d; - - /* Detect special cases. Check for NaN first, because some ports - (specifically the i386) do not emit correct ieee-fp code by default, and - thus will generate a core dump here if we pass a NaN to REAL_VALUES_EQUAL - and if REAL_VALUES_EQUAL does a floating point comparison. */ - if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_IDENTICAL (dconst0, d)) - return CONST0_RTX (mode); - else if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_EQUAL (dconst1, d)) - return CONST1_RTX (mode); - else if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_EQUAL (dconst2, d)) - return CONST2_RTX (mode); - - if (sizeof u == sizeof (HOST_WIDE_INT)) - return immed_double_const (u.i[0], 0, mode); - if (sizeof u == 2 * sizeof (HOST_WIDE_INT)) - return immed_double_const (u.i[0], u.i[1], mode); - - /* The rest of this function handles the case where - a float value requires more than 2 ints of space. - It will be deleted as dead code on machines that don't need it. */ - - /* Search the chain for an existing CONST_DOUBLE with the right value. - If one is found, return it. */ - if (cfun != 0) - for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r)) - if (! memcmp ((char *) &CONST_DOUBLE_LOW (r), (char *) &u, sizeof u) - && GET_MODE (r) == mode) - return r; - - /* No; make a new one and add it to the chain. - - We may be called by an optimizer which may be discarding any memory - allocated during its processing (such as combine and loop). However, - we will be leaving this constant on the chain, so we cannot tolerate - freed memory. */ - r = rtx_alloc (CONST_DOUBLE); - PUT_MODE (r, mode); - memcpy ((char *) &CONST_DOUBLE_LOW (r), (char *) &u, sizeof u); - - /* If we aren't inside a function, don't put r on the - const_double_chain. */ - if (current_function_decl != 0) - { - CONST_DOUBLE_CHAIN (r) = const_double_chain; - const_double_chain = r; - } - else - CONST_DOUBLE_CHAIN (r) = NULL_RTX; - - return r; -} - -/* Return a CONST_DOUBLE rtx for a value specified by EXP, - which must be a REAL_CST tree node. */ - -rtx -immed_real_const (exp) - tree exp; -{ - return immed_real_const_1 (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp))); -} - -/* At the end of a function, forget the memory-constants - previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain. - Also clear out real_constant_chain and clear out all the chain-pointers. */ - -void -clear_const_double_mem () -{ - rtx r, next; - - for (r = const_double_chain; r; r = next) - { - next = CONST_DOUBLE_CHAIN (r); - CONST_DOUBLE_CHAIN (r) = 0; - } - const_double_chain = 0; -} - /* Given an expression EXP with a constant value, reduce it to the sum of an assembler symbol and an integer. Store them both in the structure *VALUE. Abort if EXP does not reduce. */ -struct addr_const +struct addr_const GTY(()) { rtx base; HOST_WIDE_INT offset; @@ -2362,103 +2143,73 @@ decode_addr_const (exp, value) } /* We do RTX_UNSPEC + XINT (blah), so nothing can go after RTX_UNSPEC. */ -enum kind { RTX_UNKNOWN, RTX_DOUBLE, RTX_INT, RTX_VECTOR, RTX_UNSPEC }; -struct rtx_const +enum kind { RTX_UNKNOWN, RTX_DOUBLE, RTX_VECTOR, RTX_INT, RTX_UNSPEC }; +struct rtx_const GTY(()) { ENUM_BITFIELD(kind) kind : 16; ENUM_BITFIELD(machine_mode) mode : 16; - union { - union real_extract du; - struct addr_const addr; - struct {HOST_WIDE_INT high, low;} di; - - /* The max vector size we have is 8 wide. This should be enough. */ - HOST_WIDE_INT veclo[16]; - HOST_WIDE_INT vechi[16]; - } un; + union rtx_const_un { + REAL_VALUE_TYPE du; + struct rtx_const_u_addr { + rtx base; + const char *symbol; + HOST_WIDE_INT offset; + } GTY ((tag ("1"))) addr; + struct rtx_const_u_di { + HOST_WIDE_INT high; + HOST_WIDE_INT low; + } GTY ((tag ("0"))) di; + + /* The max vector size we have is 16 wide; two variants for + integral and floating point vectors. */ + struct rtx_const_int_vec { + HOST_WIDE_INT high; + HOST_WIDE_INT low; + } GTY ((tag ("2"))) int_vec[16]; + + REAL_VALUE_TYPE GTY ((tag ("3"))) fp_vec[8]; + + } GTY ((desc ("%1.kind >= RTX_INT"), descbits ("1"))) un; }; /* Uniquize all constants that appear in memory. Each constant in memory thus far output is recorded - in `const_hash_table' with a `struct constant_descriptor' - that contains a polish representation of the value of - the constant. - - We cannot store the trees in the hash table - because the trees may be temporary. */ + in `const_hash_table'. */ -struct constant_descriptor +struct constant_descriptor_tree GTY(()) { - struct constant_descriptor *next; + /* More constant_descriptors with the same hash code. */ + struct constant_descriptor_tree *next; + + /* The label of the constant. */ const char *label; + + /* A MEM for the constant. */ rtx rtl; - /* Make sure the data is reasonably aligned. */ - union - { - unsigned char contents[1]; -#ifdef HAVE_LONG_DOUBLE - long double d; -#else - double d; -#endif - } u; + + /* The value of the constant. */ + tree value; }; -#define HASHBITS 30 #define MAX_HASH_TABLE 1009 -static struct constant_descriptor *const_hash_table[MAX_HASH_TABLE]; +static GTY(()) struct constant_descriptor_tree * + const_hash_table[MAX_HASH_TABLE]; /* We maintain a hash table of STRING_CST values. Unless we are asked to force out a string constant, we defer output of the constants until we know they are actually used. This will be if something takes its address or if there is a usage of the string in the RTL of a function. */ -#define STRHASH(x) ((hashval_t) ((long) (x) >> 3)) +#define STRHASH(x) htab_hash_pointer (x) -struct deferred_string +struct deferred_string GTY(()) { const char *label; tree exp; int labelno; }; -static htab_t const_str_htab; - -/* Mark a const_hash_table descriptor for GC. */ - -static void -mark_const_hash_entry (ptr) - void *ptr; -{ - struct constant_descriptor *desc = * (struct constant_descriptor **) ptr; - - while (desc) - { - ggc_mark_rtx (desc->rtl); - desc = desc->next; - } -} - -/* Mark the hash-table element X (which is really a pointer to an - struct deferred_string *). */ - -static int -mark_const_str_htab_1 (x, data) - void **x; - void *data ATTRIBUTE_UNUSED; -{ - ggc_mark_tree (((struct deferred_string *) *x)->exp); - return 1; -} - -/* Mark a const_str_htab for GC. */ - -static void -mark_const_str_htab (htab) - void *htab; -{ - htab_traverse (*((htab_t *) htab), mark_const_str_htab_1, NULL); -} +static GTY ((param_is (struct deferred_string))) htab_t const_str_htab; /* Returns a hash code for X (which is a really a struct deferred_string *). */ @@ -2470,7 +2221,7 @@ const_str_htab_hash (x) return STRHASH (((const struct deferred_string *) x)->label); } -/* Returns non-zero if the value represented by X (which is really a +/* Returns nonzero if the value represented by X (which is really a struct deferred_string *) is the same as that given by Y (which is really a char *). */ @@ -2482,23 +2233,22 @@ const_str_htab_eq (x, y) return (((const struct deferred_string *) x)->label == (const char *) y); } -/* Delete the hash table entry dfsp. */ +/* Compute a hash code for a constant expression. */ -static void -const_str_htab_del (dfsp) - void *dfsp; +static unsigned int +const_hash (exp) + tree exp; { - free (dfsp); + return const_hash_1 (exp) % MAX_HASH_TABLE; } -/* Compute a hash code for a constant expression. */ - -static int -const_hash (exp) +static unsigned int +const_hash_1 (exp) tree exp; { const char *p; - int len, hi, i; + unsigned int hi; + int len, i; enum tree_code code = TREE_CODE (exp); /* Either set P and LEN to the address and len of something to hash and @@ -2512,9 +2262,7 @@ const_hash (exp) break; case REAL_CST: - p = (char *) &TREE_REAL_CST (exp); - len = sizeof TREE_REAL_CST (exp); - break; + return real_hash (TREE_REAL_CST_PTR (exp)); case STRING_CST: p = TREE_STRING_POINTER (exp); @@ -2522,8 +2270,8 @@ const_hash (exp) break; case COMPLEX_CST: - return (const_hash (TREE_REALPART (exp)) * 5 - + const_hash (TREE_IMAGPART (exp))); + return (const_hash_1 (TREE_REALPART (exp)) * 5 + + const_hash_1 (TREE_IMAGPART (exp))); case CONSTRUCTOR: if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE) @@ -2540,23 +2288,11 @@ const_hash (exp) { tree link; - /* For record type, include the type in the hashing. - We do not do so for array types - because (1) the sizes of the elements are sufficient - and (2) distinct array types can have the same constructor. - Instead, we include the array size because the constructor could - be shorter. */ - if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) - hi = ((unsigned long) TREE_TYPE (exp) & ((1 << HASHBITS) - 1)) - % MAX_HASH_TABLE; - else - hi = ((5 + int_size_in_bytes (TREE_TYPE (exp))) - & ((1 << HASHBITS) - 1)) % MAX_HASH_TABLE; + hi = 5 + int_size_in_bytes (TREE_TYPE (exp)); for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) if (TREE_VALUE (link)) - hi - = (hi * 603 + const_hash (TREE_VALUE (link))) % MAX_HASH_TABLE; + hi = hi * 603 + const_hash_1 (TREE_VALUE (link)); return hi; } @@ -2580,25 +2316,22 @@ const_hash (exp) hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13; else abort (); - - hi &= (1 << HASHBITS) - 1; - hi %= MAX_HASH_TABLE; } return hi; case PLUS_EXPR: case MINUS_EXPR: - return (const_hash (TREE_OPERAND (exp, 0)) * 9 - + const_hash (TREE_OPERAND (exp, 1))); + return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9 + + const_hash_1 (TREE_OPERAND (exp, 1))); case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR: - return const_hash (TREE_OPERAND (exp, 0)) * 7 + 2; + return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2; default: /* A language specific constant. Just hash the code. */ - return (int) code % MAX_HASH_TABLE; + return code; } /* Compute hashing function */ @@ -2606,462 +2339,161 @@ const_hash (exp) for (i = 0; i < len; i++) hi = ((hi * 613) + (unsigned) (p[i])); - hi &= (1 << HASHBITS) - 1; - hi %= MAX_HASH_TABLE; return hi; } - -/* Compare a constant expression EXP with a constant-descriptor DESC. - Return 1 if DESC describes a constant with the same value as EXP. */ - -static int -compare_constant (exp, desc) - tree exp; - struct constant_descriptor *desc; -{ - return 0 != compare_constant_1 (exp, desc->u.contents); -} - -/* Compare constant expression EXP with a substring P of a constant descriptor. - If they match, return a pointer to the end of the substring matched. - If they do not match, return 0. - Since descriptors are written in polish prefix notation, - this function can be used recursively to test one operand of EXP - against a subdescriptor, and if it succeeds it returns the - address of the subdescriptor for the next operand. */ +/* Compare t1 and t2, and return 1 only if they are known to result in + the same bit pattern on output. */ -static const unsigned char * -compare_constant_1 (exp, p) - tree exp; - const unsigned char *p; +static int +compare_constant (t1, t2) + tree t1; + tree t2; { - const unsigned char *strp; - int len; - enum tree_code code = TREE_CODE (exp); + enum tree_code typecode; - if (code != (enum tree_code) *p++) + if (t1 == NULL_TREE) + return t2 == NULL_TREE; + if (t2 == NULL_TREE) return 0; - /* Either set STRP, P and LEN to pointers and length to compare and exit the - switch, or return the result of the comparison. */ + if (TREE_CODE (t1) != TREE_CODE (t2)) + return 0; - switch (code) + switch (TREE_CODE (t1)) { case INTEGER_CST: /* Integer constants are the same only if the same width of type. */ - if (*p++ != TYPE_PRECISION (TREE_TYPE (exp))) + if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2))) return 0; - - strp = (unsigned char *) &TREE_INT_CST (exp); - len = sizeof TREE_INT_CST (exp); - break; + return tree_int_cst_equal (t1, t2); case REAL_CST: /* Real constants are the same only if the same width of type. */ - if (*p++ != TYPE_PRECISION (TREE_TYPE (exp))) + if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2))) return 0; - strp = (unsigned char *) &TREE_REAL_CST (exp); - len = sizeof TREE_REAL_CST (exp); - break; + return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2)); case STRING_CST: if (flag_writable_strings) return 0; - if ((enum machine_mode) *p++ != TYPE_MODE (TREE_TYPE (exp))) + if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))) return 0; - strp = (const unsigned char *) TREE_STRING_POINTER (exp); - len = TREE_STRING_LENGTH (exp); - if (memcmp ((char *) &TREE_STRING_LENGTH (exp), p, - sizeof TREE_STRING_LENGTH (exp))) - return 0; - - p += sizeof TREE_STRING_LENGTH (exp); - break; + return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2) + && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2), + TREE_STRING_LENGTH (t1))); case COMPLEX_CST: - p = compare_constant_1 (TREE_REALPART (exp), p); - if (p == 0) - return 0; - - return compare_constant_1 (TREE_IMAGPART (exp), p); + return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2)) + && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2))); case CONSTRUCTOR: - if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE) - { - int xlen = len = int_size_in_bytes (TREE_TYPE (exp)); - unsigned char *tmp = (unsigned char *) alloca (len); - - get_set_constructor_bytes (exp, tmp, len); - strp = (unsigned char *) tmp; - if (memcmp ((char *) &xlen, p, sizeof xlen)) - return 0; + typecode = TREE_CODE (TREE_TYPE (t1)); + if (typecode != TREE_CODE (TREE_TYPE (t2))) + return 0; - p += sizeof xlen; - break; - } - else + if (typecode == SET_TYPE) { - tree link; - int length = list_length (CONSTRUCTOR_ELTS (exp)); - tree type; - enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp)); - int have_purpose = 0; + int len = int_size_in_bytes (TREE_TYPE (t2)); + unsigned char *tmp1, *tmp2; - for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) - if (TREE_PURPOSE (link)) - have_purpose = 1; - - if (memcmp ((char *) &length, p, sizeof length)) + if (int_size_in_bytes (TREE_TYPE (t1)) != len) return 0; - p += sizeof length; - - /* For record constructors, insist that the types match. - For arrays, just verify both constructors are for arrays. - Then insist that either both or none have any TREE_PURPOSE - values. */ - if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) - type = TREE_TYPE (exp); - else - type = 0; + tmp1 = (unsigned char *) alloca (len); + tmp2 = (unsigned char *) alloca (len); - if (memcmp ((char *) &type, p, sizeof type)) + if (get_set_constructor_bytes (t1, tmp1, len) != NULL_TREE) + return 0; + if (get_set_constructor_bytes (t2, tmp2, len) != NULL_TREE) return 0; - if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) + return memcmp (tmp1, tmp2, len) != 0; + } + else + { + tree l1, l2; + + if (typecode == ARRAY_TYPE) { - if (memcmp ((char *) &mode, p, sizeof mode)) + HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1)); + /* For arrays, check that the sizes all match. */ + if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)) + || size_1 == -1 + || size_1 != int_size_in_bytes (TREE_TYPE (t2))) return 0; - - p += sizeof mode; } - - p += sizeof type; - - if (memcmp ((char *) &have_purpose, p, sizeof have_purpose)) - return 0; - - p += sizeof have_purpose; - - /* For arrays, insist that the size in bytes match. */ - if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) + else { - HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (exp)); - - if (memcmp ((char *) &size, p, sizeof size)) + /* For record and union constructors, require exact type + equality. */ + if (TREE_TYPE (t1) != TREE_TYPE (t2)) return 0; - - p += sizeof size; } - for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) + for (l1 = CONSTRUCTOR_ELTS (t1), l2 = CONSTRUCTOR_ELTS (t2); + l1 && l2; + l1 = TREE_CHAIN (l1), l2 = TREE_CHAIN (l2)) { - if (TREE_VALUE (link)) + /* Check that each value is the same... */ + if (! compare_constant (TREE_VALUE (l1), TREE_VALUE (l2))) + return 0; + /* ... and that they apply to the same fields! */ + if (typecode == ARRAY_TYPE) { - if ((p = compare_constant_1 (TREE_VALUE (link), p)) == 0) + if (! compare_constant (TREE_PURPOSE (l1), + TREE_PURPOSE (l2))) return 0; } else { - tree zero = 0; - - if (memcmp ((char *) &zero, p, sizeof zero)) - return 0; - - p += sizeof zero; - } - - if (TREE_PURPOSE (link) - && TREE_CODE (TREE_PURPOSE (link)) == FIELD_DECL) - { - if (memcmp ((char *) &TREE_PURPOSE (link), p, - sizeof TREE_PURPOSE (link))) - return 0; - - p += sizeof TREE_PURPOSE (link); - } - else if (TREE_PURPOSE (link)) - { - if ((p = compare_constant_1 (TREE_PURPOSE (link), p)) == 0) + if (TREE_PURPOSE (l1) != TREE_PURPOSE (l2)) return 0; } - else if (have_purpose) - { - int zero = 0; - - if (memcmp ((char *) &zero, p, sizeof zero)) - return 0; - - p += sizeof zero; - } } - return p; + return l1 == NULL_TREE && l2 == NULL_TREE; } case ADDR_EXPR: case FDESC_EXPR: { - struct addr_const value; + struct addr_const value1, value2; - decode_addr_const (exp, &value); - strp = (unsigned char *) &value.offset; - len = sizeof value.offset; - /* Compare the offset. */ - while (--len >= 0) - if (*p++ != *strp++) - return 0; - - /* Compare symbol name. */ - strp = (const unsigned char *) XSTR (value.base, 0); - len = strlen ((const char *) strp) + 1; + decode_addr_const (t1, &value1); + decode_addr_const (t2, &value2); + return (value1.offset == value2.offset + && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0); } - break; case PLUS_EXPR: case MINUS_EXPR: case RANGE_EXPR: - p = compare_constant_1 (TREE_OPERAND (exp, 0), p); - if (p == 0) - return 0; - - return compare_constant_1 (TREE_OPERAND (exp, 1), p); + return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)) + && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1))); case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR: - return compare_constant_1 (TREE_OPERAND (exp, 0), p); + return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)); default: { - tree new = (*lang_hooks.expand_constant) (exp); - - if (new != exp) - return compare_constant_1 (new, p); + tree nt1, nt2; + nt1 = (*lang_hooks.expand_constant) (t1); + nt2 = (*lang_hooks.expand_constant) (t2); + if (nt1 != t1 || nt2 != t2) + return compare_constant (nt1, nt2); else return 0; } } - /* Compare constant contents. */ - while (--len >= 0) - if (*p++ != *strp++) - return 0; - - return p; -} - -/* Construct a constant descriptor for the expression EXP. - It is up to the caller to enter the descriptor in the hash table. */ - -static struct constant_descriptor * -record_constant (exp) - tree exp; -{ - struct constant_descriptor *next = 0; - char *label = 0; - rtx rtl = 0; - int pad; - - /* Make a struct constant_descriptor. The first three pointers will - be filled in later. Here we just leave space for them. */ - - obstack_grow (&permanent_obstack, (char *) &next, sizeof next); - obstack_grow (&permanent_obstack, (char *) &label, sizeof label); - obstack_grow (&permanent_obstack, (char *) &rtl, sizeof rtl); - - /* Align the descriptor for the data payload. */ - pad = (offsetof (struct constant_descriptor, u) - - offsetof(struct constant_descriptor, rtl) - - sizeof(next->rtl)); - if (pad > 0) - obstack_blank (&permanent_obstack, pad); - - record_constant_1 (exp); - return (struct constant_descriptor *) obstack_finish (&permanent_obstack); -} - -/* Add a description of constant expression EXP - to the object growing in `permanent_obstack'. - No need to return its address; the caller will get that - from the obstack when the object is complete. */ - -static void -record_constant_1 (exp) - tree exp; -{ - const unsigned char *strp; - int len; - enum tree_code code = TREE_CODE (exp); - - obstack_1grow (&permanent_obstack, (unsigned int) code); - - switch (code) - { - case INTEGER_CST: - obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp))); - strp = (unsigned char *) &TREE_INT_CST (exp); - len = sizeof TREE_INT_CST (exp); - break; - - case REAL_CST: - obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp))); - strp = (unsigned char *) &TREE_REAL_CST (exp); - len = sizeof TREE_REAL_CST (exp); - break; - - case STRING_CST: - if (flag_writable_strings) - return; - - obstack_1grow (&permanent_obstack, TYPE_MODE (TREE_TYPE (exp))); - strp = (const unsigned char *) TREE_STRING_POINTER (exp); - len = TREE_STRING_LENGTH (exp); - obstack_grow (&permanent_obstack, (char *) &TREE_STRING_LENGTH (exp), - sizeof TREE_STRING_LENGTH (exp)); - break; - - case COMPLEX_CST: - record_constant_1 (TREE_REALPART (exp)); - record_constant_1 (TREE_IMAGPART (exp)); - return; - - case CONSTRUCTOR: - if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE) - { - int nbytes = int_size_in_bytes (TREE_TYPE (exp)); - obstack_grow (&permanent_obstack, &nbytes, sizeof (nbytes)); - obstack_blank (&permanent_obstack, nbytes); - get_set_constructor_bytes - (exp, (unsigned char *) permanent_obstack.next_free-nbytes, - nbytes); - return; - } - else - { - tree link; - int length = list_length (CONSTRUCTOR_ELTS (exp)); - enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp)); - tree type; - int have_purpose = 0; - - for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) - if (TREE_PURPOSE (link)) - have_purpose = 1; - - obstack_grow (&permanent_obstack, (char *) &length, sizeof length); - - /* For record constructors, insist that the types match. - For arrays, just verify both constructors are for arrays - of the same mode. Then insist that either both or none - have any TREE_PURPOSE values. */ - if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE) - type = TREE_TYPE (exp); - else - type = 0; - - obstack_grow (&permanent_obstack, (char *) &type, sizeof type); - if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) - obstack_grow (&permanent_obstack, &mode, sizeof mode); - - obstack_grow (&permanent_obstack, (char *) &have_purpose, - sizeof have_purpose); - - /* For arrays, insist that the size in bytes match. */ - if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) - { - HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (exp)); - obstack_grow (&permanent_obstack, (char *) &size, sizeof size); - } - - for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link)) - { - if (TREE_VALUE (link)) - record_constant_1 (TREE_VALUE (link)); - else - { - tree zero = 0; - - obstack_grow (&permanent_obstack, - (char *) &zero, sizeof zero); - } - - if (TREE_PURPOSE (link) - && TREE_CODE (TREE_PURPOSE (link)) == FIELD_DECL) - obstack_grow (&permanent_obstack, - (char *) &TREE_PURPOSE (link), - sizeof TREE_PURPOSE (link)); - else if (TREE_PURPOSE (link)) - record_constant_1 (TREE_PURPOSE (link)); - else if (have_purpose) - { - int zero = 0; - - obstack_grow (&permanent_obstack, - (char *) &zero, sizeof zero); - } - } - } - return; - - case ADDR_EXPR: - { - struct addr_const value; - - decode_addr_const (exp, &value); - /* Record the offset. */ - obstack_grow (&permanent_obstack, - (char *) &value.offset, sizeof value.offset); - - switch (GET_CODE (value.base)) - { - case SYMBOL_REF: - /* Record the symbol name. */ - obstack_grow (&permanent_obstack, XSTR (value.base, 0), - strlen (XSTR (value.base, 0)) + 1); - break; - case LABEL_REF: - /* Record the address of the CODE_LABEL. It may not have - been emitted yet, so it's UID may be zero. But pointer - identity is good enough. */ - obstack_grow (&permanent_obstack, &XEXP (value.base, 0), - sizeof (rtx)); - break; - default: - abort (); - } - } - return; - - case PLUS_EXPR: - case MINUS_EXPR: - case RANGE_EXPR: - record_constant_1 (TREE_OPERAND (exp, 0)); - record_constant_1 (TREE_OPERAND (exp, 1)); - return; - - case NOP_EXPR: - case CONVERT_EXPR: - case NON_LVALUE_EXPR: - record_constant_1 (TREE_OPERAND (exp, 0)); - return; - - default: - { - tree new = (*lang_hooks.expand_constant) (exp); - - if (new != exp) - record_constant_1 (new); - return; - } - } - - /* Record constant contents. */ - obstack_grow (&permanent_obstack, strp, len); + /* Should not get here. */ + abort (); } /* Record a list of constant expressions that were passed to @@ -3133,9 +2565,8 @@ output_after_function_constants () after_function_constants = 0; } -/* Make a copy of the whole tree structure for a constant. - This handles the same types of nodes that compare_constant - and record_constant handle. */ +/* Make a copy of the whole tree structure for a constant. This + handles the same types of nodes that compare_constant handles. */ static tree copy_constant (exp) @@ -3191,7 +2622,14 @@ copy_constant (exp) } default: - abort (); + { + tree t; + t = (*lang_hooks.expand_constant) (exp); + if (t != exp) + return copy_constant (t); + else + abort (); + } } } @@ -3203,7 +2641,7 @@ copy_constant (exp) Otherwise, output such a constant in memory (or defer it for later) and generate an rtx for it. - If DEFER is non-zero, the output of string constants can be deferred + If DEFER is nonzero, the output of string constants can be deferred and output only if referenced in the function after all optimizations. The TREE_CST_RTL of EXP is set up to point to that rtx. @@ -3215,7 +2653,7 @@ output_constant_def (exp, defer) int defer; { int hash; - struct constant_descriptor *desc; + struct constant_descriptor_tree *desc; struct deferred_string **defstr; char label[256]; int reloc; @@ -3224,8 +2662,8 @@ output_constant_def (exp, defer) int labelno = -1; rtx rtl; - /* We can't just use the saved RTL if this is a defererred string constant - and we are not to defer anymode. */ + /* We can't just use the saved RTL if this is a deferred string constant + and we are not to defer anymore. */ if (TREE_CODE (exp) != INTEGER_CST && TREE_CST_RTL (exp) && (defer || !STRING_POOL_ADDRESS_P (XEXP (TREE_CST_RTL (exp), 0)))) return TREE_CST_RTL (exp); @@ -3239,10 +2677,10 @@ output_constant_def (exp, defer) to see if any of them describes EXP. If yes, the descriptor records the label number already assigned. */ - hash = const_hash (exp) % MAX_HASH_TABLE; + hash = const_hash (exp); for (desc = const_hash_table[hash]; desc; desc = desc->next) - if (compare_constant (exp, desc)) + if (compare_constant (exp, desc->value)) break; if (desc == 0) @@ -3256,9 +2694,10 @@ output_constant_def (exp, defer) labelno = const_labelno++; ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno); - desc = record_constant (exp); + desc = ggc_alloc (sizeof (*desc)); desc->next = const_hash_table[hash]; desc->label = ggc_strdup (label); + desc->value = copy_constant (exp); const_hash_table[hash] = desc; /* We have a symbol name; construct the SYMBOL_REF and the MEM. */ @@ -3281,20 +2720,18 @@ output_constant_def (exp, defer) /* Optionally set flags or add text to the name to record information such as that it is a function name. If the name is changed, the macro ASM_OUTPUT_LABELREF will have to know how to strip this information. */ -#ifdef ENCODE_SECTION_INFO /* A previously-processed constant would already have section info encoded in it. */ if (! found) { - /* Take care not to invoque ENCODE_SECTION_INFO for constants - which don't have a TREE_CST_RTL. */ + /* Take care not to invoke targetm.encode_section_info for + constants which don't have a TREE_CST_RTL. */ if (TREE_CODE (exp) != INTEGER_CST) - ENCODE_SECTION_INFO (exp); - + (*targetm.encode_section_info) (exp, true); + desc->rtl = rtl; desc->label = XSTR (XEXP (desc->rtl, 0), 0); } -#endif #ifdef CONSTANT_AFTER_FUNCTION_P if (current_function_decl != 0 @@ -3330,7 +2767,7 @@ output_constant_def (exp, defer) = (struct deferred_constant *) xmalloc (sizeof (struct deferred_constant)); - p->exp = copy_constant (exp); + p->exp = desc->value; p->reloc = reloc; p->labelno = labelno; if (after_function) @@ -3363,9 +2800,9 @@ output_constant_def (exp, defer) struct deferred_string *p; p = (struct deferred_string *) - xmalloc (sizeof (struct deferred_string)); + ggc_alloc (sizeof (struct deferred_string)); - p->exp = copy_constant (exp); + p->exp = desc->value; p->label = desc->label; p->labelno = labelno; *defstr = p; @@ -3398,18 +2835,7 @@ output_constant_def_contents (exp, reloc, labelno) if (IN_NAMED_SECTION (exp)) named_section (exp, NULL, reloc); else - { - /* First switch to text section, except for writable strings. */ -#ifdef SELECT_SECTION - SELECT_SECTION (exp, reloc, align); -#else - if (((TREE_CODE (exp) == STRING_CST) && flag_writable_strings) - || (flag_pic && reloc)) - data_section (); - else - readonly_data_section (); -#endif - } + (*targetm.asm_out.select_section) (exp, reloc, align); if (align > BITS_PER_UNIT) { @@ -3429,15 +2855,33 @@ output_constant_def_contents (exp, reloc, labelno) } +/* Used in the hash tables to avoid outputting the same constant + twice. Unlike 'struct constant_descriptor_tree', RTX constants + are output once per function, not once per file; there seems + to be no reason for the difference. */ + +struct constant_descriptor_rtx GTY(()) +{ + /* More constant_descriptors with the same hash code. */ + struct constant_descriptor_rtx *next; + + /* A MEM for the constant. */ + rtx rtl; + + /* The value of the constant. */ + struct rtx_const value; +}; + /* Structure to represent sufficient information about a constant so that it can be output when the constant pool is output, so that function integration can be done, and to simplify handling on machines that reference constant pool as base+displacement. */ -struct pool_constant +struct pool_constant GTY(()) { - struct constant_descriptor *desc; - struct pool_constant *next, *next_sym; + struct constant_descriptor_rtx *desc; + struct pool_constant *next; + struct pool_constant *next_sym; rtx constant; enum machine_mode mode; int labelno; @@ -3449,8 +2893,7 @@ struct pool_constant /* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true. The argument is XSTR (... , 0) */ -#define SYMHASH(LABEL) \ - ((((unsigned long) (LABEL)) & ((1 << HASHBITS) - 1)) % MAX_RTX_HASH_TABLE) +#define SYMHASH(LABEL) (((unsigned long) (LABEL)) % MAX_RTX_HASH_TABLE) /* Initialize constant pool hashing for a new function. */ @@ -3459,81 +2902,19 @@ init_varasm_status (f) struct function *f; { struct varasm_status *p; - p = (struct varasm_status *) xmalloc (sizeof (struct varasm_status)); + p = (struct varasm_status *) ggc_alloc (sizeof (struct varasm_status)); f->varasm = p; p->x_const_rtx_hash_table - = ((struct constant_descriptor **) - xcalloc (MAX_RTX_HASH_TABLE, sizeof (struct constant_descriptor *))); + = ((struct constant_descriptor_rtx **) + ggc_alloc_cleared (MAX_RTX_HASH_TABLE + * sizeof (struct constant_descriptor_rtx *))); p->x_const_rtx_sym_hash_table = ((struct pool_constant **) - xcalloc (MAX_RTX_HASH_TABLE, sizeof (struct pool_constant *))); + ggc_alloc_cleared (MAX_RTX_HASH_TABLE + * sizeof (struct pool_constant *))); p->x_first_pool = p->x_last_pool = 0; p->x_pool_offset = 0; - p->x_const_double_chain = 0; -} - -/* Mark PC for GC. */ - -static void -mark_pool_constant (pc) - struct pool_constant *pc; -{ - while (pc) - { - ggc_mark (pc); - ggc_mark_rtx (pc->constant); - ggc_mark_rtx (pc->desc->rtl); - pc = pc->next; - } -} - -/* Mark P for GC. */ - -void -mark_varasm_status (p) - struct varasm_status *p; -{ - if (p == NULL) - return; - - mark_pool_constant (p->x_first_pool); - ggc_mark_rtx (p->x_const_double_chain); -} - -/* Clear out all parts of the state in F that can safely be discarded - after the function has been compiled, to let garbage collection - reclaim the memory. */ - -void -free_varasm_status (f) - struct function *f; -{ - struct varasm_status *p; - int i; - - p = f->varasm; - - /* Clear out the hash tables. */ - for (i = 0; i < MAX_RTX_HASH_TABLE; ++i) - { - struct constant_descriptor *cd; - - cd = p->x_const_rtx_hash_table[i]; - while (cd) - { - struct constant_descriptor *next = cd->next; - - free (cd); - cd = next; - } - } - - free (p->x_const_rtx_hash_table); - free (p->x_const_rtx_sym_hash_table); - free (p); - - f->varasm = NULL; } @@ -3559,9 +2940,29 @@ decode_rtx_const (mode, x, value) value->kind = RTX_DOUBLE; if (GET_MODE (x) != VOIDmode) { + const REAL_VALUE_TYPE *r = CONST_DOUBLE_REAL_VALUE (x); + value->mode = GET_MODE (x); - memcpy ((char *) &value->un.du, - (char *) &CONST_DOUBLE_LOW (x), sizeof value->un.du); + + /* Copy the REAL_VALUE_TYPE by members so that we don't + copy garbage from the original structure into our + carefully cleaned hashing structure. */ + value->un.du.class = r->class; + value->un.du.sign = r->sign; + switch (r->class) + { + case rvc_zero: + case rvc_inf: + break; + case rvc_normal: + value->un.du.exp = r->exp; + /* FALLTHRU */ + case rvc_nan: + memcpy (value->un.du.sig, r->sig, sizeof (r->sig)); + break; + default: + abort (); + } } else { @@ -3573,28 +2974,59 @@ decode_rtx_const (mode, x, value) case CONST_VECTOR: { int units, i; - rtx elt; units = CONST_VECTOR_NUNITS (x); value->kind = RTX_VECTOR; value->mode = mode; - for (i = 0; i < units; ++i) + if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT) { - elt = CONST_VECTOR_ELT (x, i); - if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT) + for (i = 0; i < units; ++i) { - value->un.veclo[i] = (HOST_WIDE_INT) INTVAL (elt); - value->un.vechi[i] = 0; + rtx elt = CONST_VECTOR_ELT (x, i); + if (GET_CODE (elt) == CONST_INT) + { + value->un.int_vec[i].low = INTVAL (elt); + value->un.int_vec[i].high = 0; + } + else + { + value->un.int_vec[i].low = CONST_DOUBLE_LOW (elt); + value->un.int_vec[i].high = CONST_DOUBLE_HIGH (elt); + } } - else if (GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT) + } + else if (GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT) + { + for (i = 0; i < units; ++i) { - value->un.veclo[i] = (HOST_WIDE_INT) CONST_DOUBLE_LOW (elt); - value->un.vechi[i] = (HOST_WIDE_INT) CONST_DOUBLE_HIGH (elt); + const REAL_VALUE_TYPE *r + = CONST_DOUBLE_REAL_VALUE (CONST_VECTOR_ELT (x, i)); + REAL_VALUE_TYPE *d = &value->un.fp_vec[i]; + + /* Copy the REAL_VALUE_TYPE by members so that we don't + copy garbage from the original structure into our + carefully cleaned hashing structure. */ + d->class = r->class; + d->sign = r->sign; + switch (r->class) + { + case rvc_zero: + case rvc_inf: + break; + case rvc_normal: + d->exp = r->exp; + /* FALLTHRU */ + case rvc_nan: + memcpy (d->sig, r->sig, sizeof (r->sig)); + break; + default: + abort (); + } } - else - abort (); } + else + abort (); } break; @@ -3634,28 +3066,29 @@ decode_rtx_const (mode, x, value) if (value->kind == RTX_INT && value->un.addr.base != 0 && GET_CODE (value->un.addr.base) == UNSPEC) - { + { /* For a simple UNSPEC, the base is set to the operand, the kind field is set to the index of - the unspec expression. + the unspec expression. Together with the code below, in case that - the operand is a SYMBOL_REF or LABEL_REF, - the address of the string or the code_label + the operand is a SYMBOL_REF or LABEL_REF, + the address of the string or the code_label is taken as base. */ if (XVECLEN (value->un.addr.base, 0) == 1) - { + { value->kind = RTX_UNSPEC + XINT (value->un.addr.base, 1); value->un.addr.base = XVECEXP (value->un.addr.base, 0, 0); } } - if (value->kind > RTX_DOUBLE && value->un.addr.base != 0) + if (value->kind >= RTX_INT && value->un.addr.base != 0) switch (GET_CODE (value->un.addr.base)) { case SYMBOL_REF: /* Use the string's address, not the SYMBOL_REF's address, for the sake of addresses of library routines. */ - value->un.addr.base = (rtx) XSTR (value->un.addr.base, 0); + value->un.addr.symbol = XSTR (value->un.addr.base, 0); + value->un.addr.base = NULL_RTX; break; case LABEL_REF: @@ -3679,9 +3112,10 @@ simplify_subtraction (x) decode_rtx_const (GET_MODE (x), XEXP (x, 0), &val0); decode_rtx_const (GET_MODE (x), XEXP (x, 1), &val1); - if (val0.kind > RTX_DOUBLE + if (val0.kind >= RTX_INT && val0.kind == val1.kind - && val0.un.addr.base == val1.un.addr.base) + && val0.un.addr.base == val1.un.addr.base + && val0.un.addr.symbol == val1.un.addr.symbol) return GEN_INT (val0.un.addr.offset - val1.un.addr.offset); return x; @@ -3689,25 +3123,27 @@ simplify_subtraction (x) /* Compute a hash code for a constant RTL expression. */ -static int +static unsigned int const_hash_rtx (mode, x) enum machine_mode mode; rtx x; { - int hi; + union { + struct rtx_const value; + unsigned int data[sizeof(struct rtx_const) / sizeof (unsigned int)]; + } u; + + unsigned int hi; size_t i; - struct rtx_const value; - decode_rtx_const (mode, x, &value); + decode_rtx_const (mode, x, &u.value); /* Compute hashing function */ hi = 0; - for (i = 0; i < sizeof value / sizeof (int); i++) - hi += ((int *) &value)[i]; + for (i = 0; i < ARRAY_SIZE (u.data); i++) + hi = hi * 613 + u.data[i]; - hi &= (1 << HASHBITS) - 1; - hi %= MAX_RTX_HASH_TABLE; - return hi; + return hi % MAX_RTX_HASH_TABLE; } /* Compare a constant rtl object X with a constant-descriptor DESC. @@ -3717,39 +3153,28 @@ static int compare_constant_rtx (mode, x, desc) enum machine_mode mode; rtx x; - struct constant_descriptor *desc; + struct constant_descriptor_rtx *desc; { - int *p = (int *) desc->u.contents; - int *strp; - int len; struct rtx_const value; decode_rtx_const (mode, x, &value); - strp = (int *) &value; - len = sizeof value / sizeof (int); /* Compare constant contents. */ - while (--len >= 0) - if (*p++ != *strp++) - return 0; - - return 1; + return memcmp (&value, &desc->value, sizeof (struct rtx_const)) == 0; } /* Construct a constant descriptor for the rtl-expression X. It is up to the caller to enter the descriptor in the hash table. */ -static struct constant_descriptor * +static struct constant_descriptor_rtx * record_constant_rtx (mode, x) enum machine_mode mode; rtx x; { - struct constant_descriptor *ptr; + struct constant_descriptor_rtx *ptr; - ptr = ((struct constant_descriptor *) - xcalloc (1, (offsetof (struct constant_descriptor, u) - + sizeof (struct rtx_const)))); - decode_rtx_const (mode, x, (struct rtx_const *) ptr->u.contents); + ptr = (struct constant_descriptor_rtx *) ggc_alloc (sizeof (*ptr)); + decode_rtx_const (mode, x, &ptr->value); return ptr; } @@ -3762,7 +3187,7 @@ mem_for_const_double (x) rtx x; { enum machine_mode mode = GET_MODE (x); - struct constant_descriptor *desc; + struct constant_descriptor_rtx *desc; for (desc = const_rtx_hash_table[const_hash_rtx (mode, x)]; desc; desc = desc->next) @@ -3771,7 +3196,7 @@ mem_for_const_double (x) return 0; } - + /* Given a constant rtx X, make (or find) a memory constant for its value and return a MEM rtx to refer to it in memory. */ @@ -3781,12 +3206,16 @@ force_const_mem (mode, x) rtx x; { int hash; - struct constant_descriptor *desc; + struct constant_descriptor_rtx *desc; char label[256]; rtx def; struct pool_constant *pool; unsigned int align; + /* If we're not allowed to drop X into the constant pool, don't. */ + if ((*targetm.cannot_force_const_mem) (x)) + return NULL_RTX; + /* Compute hash code of X. Search the descriptors for that hash code to see if any of them describes X. If yes, we have an rtx to use. */ hash = const_hash_rtx (mode, x); @@ -3800,11 +3229,12 @@ force_const_mem (mode, x) desc = record_constant_rtx (mode, x); desc->next = const_rtx_hash_table[hash]; const_rtx_hash_table[hash] = desc; - + /* Align the location counter as required by EXP's data type. */ align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode); #ifdef CONSTANT_ALIGNMENT - align = CONSTANT_ALIGNMENT (make_tree (type_for_mode (mode, 0), x), align); + align = CONSTANT_ALIGNMENT (make_tree ((*lang_hooks.types.type_for_mode) + (mode, 0), x), align); #endif pool_offset += (align / BITS_PER_UNIT) - 1; @@ -3828,7 +3258,7 @@ force_const_mem (mode, x) first_pool = pool; else last_pool->next = pool; - + last_pool = pool; pool_offset += GET_MODE_SIZE (mode); @@ -3842,7 +3272,7 @@ force_const_mem (mode, x) pool->desc->rtl = def = gen_rtx_MEM (mode, gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label))); set_mem_alias_set (def, const_alias_set); - set_mem_attributes (def, type_for_mode (mode, 0), 1); + set_mem_attributes (def, (*lang_hooks.types.type_for_mode) (mode, 0), 1); RTX_UNCHANGING_P (def) = 1; /* Add label to symbol hash table. */ @@ -3946,12 +3376,12 @@ get_pool_size () void output_constant_pool (fnname, fndecl) - const char *fnname ATTRIBUTE_UNUSED; - tree fndecl ATTRIBUTE_UNUSED; + const char *fnname ATTRIBUTE_UNUSED; + tree fndecl ATTRIBUTE_UNUSED; { struct pool_constant *pool; rtx x; - union real_extract u; + REAL_VALUE_TYPE r; /* It is possible for gcc to call force_const_mem and then to later discard the instructions which refer to the constant. In such a @@ -4006,11 +3436,7 @@ output_constant_pool (fnname, fndecl) } /* First switch to correct section. */ -#ifdef SELECT_RTX_SECTION - SELECT_RTX_SECTION (pool->mode, x, pool->align); -#else - readonly_data_section (); -#endif + (*targetm.asm_out.select_rtx_section) (pool->mode, x, pool->align); #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, pool->mode, @@ -4029,8 +3455,8 @@ output_constant_pool (fnname, fndecl) if (GET_CODE (x) != CONST_DOUBLE) abort (); - memcpy ((char *) &u, (char *) &CONST_DOUBLE_LOW (x), sizeof u); - assemble_real (u.d, pool->mode, pool->align); + REAL_VALUE_FROM_CONST_DOUBLE (r, x); + assemble_real (r, pool->mode, pool->align); break; case MODE_INT: @@ -4051,15 +3477,13 @@ output_constant_pool (fnname, fndecl) for (i = 0; i < units; i++) { elt = CONST_VECTOR_ELT (x, i); - memcpy ((char *) &u, - (char *) &CONST_DOUBLE_LOW (elt), - sizeof u); - assemble_real (u.d, GET_MODE_INNER (pool->mode), pool->align); + REAL_VALUE_FROM_CONST_DOUBLE (r, elt); + assemble_real (r, GET_MODE_INNER (pool->mode), pool->align); } } break; - case MODE_VECTOR_INT: + case MODE_VECTOR_INT: { int i, units; rtx elt; @@ -4082,6 +3506,13 @@ output_constant_pool (fnname, fndecl) abort (); } + /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS + sections have proper size. */ + if (pool->align > GET_MODE_BITSIZE (pool->mode) + && in_section == in_named + && get_named_section_flags (in_named_name) & SECTION_MERGE) + assemble_align (pool->align); + #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY done: ; #endif @@ -4103,6 +3534,7 @@ static void mark_constant_pool () { rtx insn; + rtx link; struct pool_constant *pool; if (first_pool == 0 && htab_elements (const_str_htab) == 0) @@ -4115,11 +3547,15 @@ mark_constant_pool () if (INSN_P (insn)) mark_constants (PATTERN (insn)); - for (insn = current_function_epilogue_delay_list; - insn; - insn = XEXP (insn, 1)) - if (INSN_P (insn)) - mark_constants (PATTERN (insn)); + for (link = current_function_epilogue_delay_list; + link; + link = XEXP (link, 1)) + { + insn = XEXP (link, 0); + + if (INSN_P (insn)) + mark_constants (PATTERN (insn)); + } } /* Look through appropriate parts of X, marking all entries in the @@ -4179,6 +3615,7 @@ mark_constants (x) case 'w': case 'n': case 'u': + case 'B': break; default: @@ -4206,10 +3643,11 @@ mark_constant (current_rtx, data) if (CONSTANT_POOL_ADDRESS_P (x)) { struct pool_constant *pool = find_pool_constant (cfun, x); - if (pool->mark == 0) { - pool->mark = 1; - for_each_rtx (&(pool->constant), &mark_constant, NULL); - } + if (pool->mark == 0) + { + pool->mark = 1; + for_each_rtx (&(pool->constant), &mark_constant, NULL); + } else return -1; } @@ -4241,7 +3679,7 @@ static int output_addressed_constants (exp) tree exp; { - int reloc = 0; + int reloc = 0, reloc2; tree tem; /* Give the front-end a chance to convert VALUE to something that @@ -4260,8 +3698,8 @@ output_addressed_constants (exp) ; if (TREE_CODE_CLASS (TREE_CODE (tem)) == 'c' - || TREE_CODE (tem) == CONSTRUCTOR) - output_constant_def (tem, 0); + || TREE_CODE (tem) == CONSTRUCTOR) + output_constant_def (tem, 0); if (TREE_PUBLIC (tem)) reloc |= 2; @@ -4270,11 +3708,20 @@ output_addressed_constants (exp) break; case PLUS_EXPR: - case MINUS_EXPR: reloc = output_addressed_constants (TREE_OPERAND (exp, 0)); reloc |= output_addressed_constants (TREE_OPERAND (exp, 1)); break; + case MINUS_EXPR: + reloc = output_addressed_constants (TREE_OPERAND (exp, 0)); + reloc2 = output_addressed_constants (TREE_OPERAND (exp, 1)); + /* The difference of two local labels is computable at link time. */ + if (reloc == 1 && reloc2 == 1) + reloc = 0; + else + reloc |= reloc2; + break; + case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR: @@ -4284,7 +3731,7 @@ output_addressed_constants (exp) case CONSTRUCTOR: for (tem = CONSTRUCTOR_ELTS (exp); tem; tem = TREE_CHAIN (tem)) if (TREE_VALUE (tem) != 0) - reloc |= output_addressed_constants (TREE_VALUE (tem)); + reloc |= output_addressed_constants (TREE_VALUE (tem)); break; @@ -4402,7 +3849,7 @@ initializer_constant_valid_p (value, endtype) case PLUS_EXPR: if (! INTEGRAL_TYPE_P (endtype) || TYPE_PRECISION (endtype) >= POINTER_SIZE) - { + { tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), @@ -4412,7 +3859,7 @@ initializer_constant_valid_p (value, endtype) return valid1; if (valid1 == null_pointer_node) return valid0; - } + } break; case MINUS_EXPR: @@ -4619,7 +4066,7 @@ output_constant (exp, size, align) if (TREE_CODE (exp) == INTEGER_CST) assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_INITIALIZER), - thissize, align, 1); + thissize, align, 1); else if (TREE_CODE (exp) == CONSTRUCTOR) { unsigned char *buffer = (unsigned char *) alloca (thissize); @@ -4661,7 +4108,7 @@ array_size_for_constructor (val) return TREE_STRING_LENGTH (val); max_index = NULL_TREE; - for (i = CONSTRUCTOR_ELTS (val); i ; i = TREE_CHAIN (i)) + for (i = CONSTRUCTOR_ELTS (val); i; i = TREE_CHAIN (i)) { tree index = TREE_PURPOSE (i); @@ -4994,7 +4441,7 @@ output_constructor (exp, size, align) /* This TREE_LIST contains any weak symbol declarations waiting to be emitted. */ -static tree weak_decls; +static GTY(()) tree weak_decls; /* Mark DECL as weak. */ @@ -5010,7 +4457,7 @@ mark_weak (decl) && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF) SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1; } - + /* Merge weak status between NEWDECL and OLDDECL. */ void @@ -5024,7 +4471,7 @@ merge_weak (newdecl, olddecl) if (DECL_WEAK (newdecl)) { tree wd; - + /* NEWDECL is weak, but OLDDECL is not. */ /* If we already output the OLDDECL, we're in trouble; we can't @@ -5032,7 +4479,7 @@ merge_weak (newdecl, olddecl) declare_weak because the NEWDECL and OLDDECL was not yet been merged; therefore, TREE_ASM_WRITTEN was not set. */ if (TREE_ASM_WRITTEN (olddecl)) - error_with_decl (newdecl, + error_with_decl (newdecl, "weak declaration of `%s' must precede definition"); /* If we've already generated rtl referencing OLDDECL, we may @@ -5095,7 +4542,7 @@ weak_finish () { tree t; - for (t = weak_decls; t ; t = TREE_CHAIN (t)) + for (t = weak_decls; t; t = TREE_CHAIN (t)) { tree decl = TREE_VALUE (t); const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); @@ -5150,7 +4597,7 @@ globalize_decl (decl) } #endif - ASM_GLOBALIZE_LABEL (asm_out_file, name); + (*targetm.asm_out.globalize_label) (asm_out_file, name); } /* Emit an assembler directive to make the symbol for DECL an alias to @@ -5170,8 +4617,12 @@ assemble_alias (decl, target) #ifdef ASM_OUTPUT_DEF /* Make name accessible from other files, if appropriate. */ + if (TREE_PUBLIC (decl)) - globalize_decl (decl); + { + globalize_decl (decl); + maybe_assemble_visibility (decl); + } #ifdef ASM_OUTPUT_DEF_FROM_DECLS ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target); @@ -5198,6 +4649,44 @@ assemble_alias (decl, target) TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1; } +/* Emit an assembler directive to set symbol for DECL visibility to + the visibility type VIS, which must not be VISIBILITY_DEFAULT. */ + +void +default_assemble_visibility (decl, vis) + tree decl; + int vis; +{ + static const char * const visibility_types[] = { + NULL, "internal", "hidden", "protected" + }; + + const char *name, *type; + + name = (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); + type = visibility_types[vis]; + +#ifdef HAVE_GAS_HIDDEN + fprintf (asm_out_file, "\t.%s\t", type); + assemble_name (asm_out_file, name); + fprintf (asm_out_file, "\n"); +#else + warning ("visibility attribute not supported in this configuration; ignored"); +#endif +} + +/* A helper function to call assemble_visibility when needed for a decl. */ + +static void +maybe_assemble_visibility (decl) + tree decl; +{ + enum symbol_visibility vis = decl_visibility (decl); + + if (vis != VISIBILITY_DEFAULT) + (* targetm.asm_out.visibility) (decl, vis); +} + /* Returns 1 if the target configuration supports defining public symbols so that one of them will be chosen at link time instead of generating a multiply-defined symbol error, whether through the use of weak symbols or @@ -5242,20 +4731,85 @@ make_decl_one_only (decl) void init_varasm_once () { - const_str_htab = htab_create (128, const_str_htab_hash, const_str_htab_eq, - const_str_htab_del); + const_str_htab = htab_create_ggc (128, const_str_htab_hash, + const_str_htab_eq, NULL); in_named_htab = htab_create (31, in_named_entry_hash, in_named_entry_eq, NULL); - ggc_add_root (const_hash_table, MAX_HASH_TABLE, sizeof const_hash_table[0], - mark_const_hash_entry); - ggc_add_root (&const_str_htab, 1, sizeof const_str_htab, - mark_const_str_htab); - ggc_add_tree_root (&weak_decls, 1); - const_alias_set = new_alias_set (); } +enum tls_model +decl_tls_model (decl) + tree decl; +{ + enum tls_model kind; + tree attr = lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl)); + bool is_local; + + if (attr) + { + attr = TREE_VALUE (TREE_VALUE (attr)); + if (TREE_CODE (attr) != STRING_CST) + abort (); + if (!strcmp (TREE_STRING_POINTER (attr), "local-exec")) + kind = TLS_MODEL_LOCAL_EXEC; + else if (!strcmp (TREE_STRING_POINTER (attr), "initial-exec")) + kind = TLS_MODEL_INITIAL_EXEC; + else if (!strcmp (TREE_STRING_POINTER (attr), "local-dynamic")) + kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; + else if (!strcmp (TREE_STRING_POINTER (attr), "global-dynamic")) + kind = TLS_MODEL_GLOBAL_DYNAMIC; + else + abort (); + return kind; + } + + is_local = (*targetm.binds_local_p) (decl); + if (!flag_pic) + { + if (is_local) + kind = TLS_MODEL_LOCAL_EXEC; + else + kind = TLS_MODEL_INITIAL_EXEC; + } + /* Local dynamic is inefficient when we're not combining the + parts of the address. */ + else if (optimize && is_local) + kind = TLS_MODEL_LOCAL_DYNAMIC; + else + kind = TLS_MODEL_GLOBAL_DYNAMIC; + if (kind < flag_tls_default) + kind = flag_tls_default; + + return kind; +} + +enum symbol_visibility +decl_visibility (decl) + tree decl; +{ + tree attr = lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)); + + if (attr) + { + const char *which = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr))); + + if (strcmp (which, "default") == 0) + return VISIBILITY_DEFAULT; + if (strcmp (which, "internal") == 0) + return VISIBILITY_INTERNAL; + if (strcmp (which, "hidden") == 0) + return VISIBILITY_HIDDEN; + if (strcmp (which, "protected") == 0) + return VISIBILITY_PROTECTED; + + abort (); + } + + return VISIBILITY_DEFAULT; +} + /* Select a set of attributes for section NAME based on the properties of DECL and whether or not RELOC indicates that DECL's initializer might contain runtime relocations. @@ -5269,11 +4823,21 @@ default_section_type_flags (decl, name, reloc) const char *name; int reloc; { + return default_section_type_flags_1 (decl, name, reloc, flag_pic); +} + +unsigned int +default_section_type_flags_1 (decl, name, reloc, shlib) + tree decl; + const char *name; + int reloc; + int shlib; +{ unsigned int flags; if (decl && TREE_CODE (decl) == FUNCTION_DECL) flags = SECTION_CODE; - else if (decl && DECL_READONLY_SECTION (decl, reloc)) + else if (decl && decl_readonly_section_1 (decl, reloc, shlib)) flags = 0; else flags = SECTION_WRITE; @@ -5281,14 +4845,36 @@ default_section_type_flags (decl, name, reloc) if (decl && DECL_ONE_ONLY (decl)) flags |= SECTION_LINKONCE; + if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl)) + flags |= SECTION_TLS | SECTION_WRITE; + if (strcmp (name, ".bss") == 0 || strncmp (name, ".bss.", 5) == 0 || strncmp (name, ".gnu.linkonce.b.", 16) == 0 || strcmp (name, ".sbss") == 0 || strncmp (name, ".sbss.", 6) == 0 - || strncmp (name, ".gnu.linkonce.sb.", 17) == 0) + || strncmp (name, ".gnu.linkonce.sb.", 17) == 0 + || strcmp (name, ".tbss") == 0 + || strncmp (name, ".gnu.linkonce.tb.", 17) == 0) flags |= SECTION_BSS; + if (strcmp (name, ".tdata") == 0 + || strcmp (name, ".tbss") == 0 + || strncmp (name, ".gnu.linkonce.td.", 17) == 0 + || strncmp (name, ".gnu.linkonce.tb.", 17) == 0) + flags |= SECTION_TLS; + + /* These three sections have special ELF types. They are neither + SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't + want to print a section type (@progbits or @nobits). If someone + is silly enough to emit code or TLS variables to one of these + sections, then don't handle them specially. */ + if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS)) + && (strcmp (name, ".init_array") == 0 + || strcmp (name, ".fini_array") == 0 + || strcmp (name, ".preinit_array") == 0)) + flags |= SECTION_NOTYPE; + return flags; } @@ -5311,7 +4897,6 @@ default_elf_asm_named_section (name, flags) unsigned int flags; { char flagchars[10], *f = flagchars; - const char *type; if (! named_section_first_declaration (name)) { @@ -5331,19 +4916,28 @@ default_elf_asm_named_section (name, flags) *f++ = 'M'; if (flags & SECTION_STRINGS) *f++ = 'S'; + if (flags & SECTION_TLS) + *f++ = 'T'; *f = '\0'; - if (flags & SECTION_BSS) - type = "nobits"; - else - type = "progbits"; + fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars); - if (flags & SECTION_ENTSIZE) - fprintf (asm_out_file, "\t.section\t%s,\"%s\",@%s,%d\n", - name, flagchars, type, flags & SECTION_ENTSIZE); - else - fprintf (asm_out_file, "\t.section\t%s,\"%s\",@%s\n", - name, flagchars, type); + if (!(flags & SECTION_NOTYPE)) + { + const char *type; + + if (flags & SECTION_BSS) + type = "nobits"; + else + type = "progbits"; + + fprintf (asm_out_file, ",@%s", type); + + if (flags & SECTION_ENTSIZE) + fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE); + } + + putc ('\n', asm_out_file); } void @@ -5407,3 +5001,465 @@ assemble_vtable_inherit (child, parent) output_addr_const (asm_out_file, parent); fputc ('\n', asm_out_file); } + +/* The lame default section selector. */ + +void +default_select_section (decl, reloc, align) + tree decl; + int reloc; + unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; +{ + bool readonly = false; + + if (DECL_P (decl)) + { + if (decl_readonly_section (decl, reloc)) + readonly = true; + } + else if (TREE_CODE (decl) == CONSTRUCTOR) + { + if (! ((flag_pic && reloc) + || !TREE_READONLY (decl) + || TREE_SIDE_EFFECTS (decl) + || !TREE_CONSTANT (decl))) + readonly = true; + } + else if (TREE_CODE (decl) == STRING_CST) + readonly = !flag_writable_strings; + else if (! (flag_pic && reloc)) + readonly = true; + + if (readonly) + readonly_data_section (); + else + data_section (); +} + +/* A helper function for default_elf_select_section and + default_elf_unique_section. Categorizes the DECL. */ + +enum section_category +{ + SECCAT_TEXT, + + SECCAT_RODATA, + SECCAT_RODATA_MERGE_STR, + SECCAT_RODATA_MERGE_STR_INIT, + SECCAT_RODATA_MERGE_CONST, + SECCAT_SRODATA, + + SECCAT_DATA, + + /* To optimize loading of shared programs, define following subsections + of data section: + _REL Contains data that has relocations, so they get grouped + together and dynamic linker will visit fewer pages in memory. + _RO Contains data that is otherwise read-only. This is useful + with prelinking as most relocations won't be dynamically + linked and thus stay read only. + _LOCAL Marks data containing relocations only to local objects. + These relocations will get fully resolved by prelinking. */ + SECCAT_DATA_REL, + SECCAT_DATA_REL_LOCAL, + SECCAT_DATA_REL_RO, + SECCAT_DATA_REL_RO_LOCAL, + + SECCAT_SDATA, + SECCAT_TDATA, + + SECCAT_BSS, + SECCAT_SBSS, + SECCAT_TBSS +}; + +static enum section_category +categorize_decl_for_section PARAMS ((tree, int, int)); + +static enum section_category +categorize_decl_for_section (decl, reloc, shlib) + tree decl; + int reloc; + int shlib; +{ + enum section_category ret; + + if (TREE_CODE (decl) == FUNCTION_DECL) + return SECCAT_TEXT; + else if (TREE_CODE (decl) == STRING_CST) + { + if (flag_writable_strings) + return SECCAT_DATA; + else + return SECCAT_RODATA_MERGE_STR; + } + else if (TREE_CODE (decl) == VAR_DECL) + { + if (DECL_INITIAL (decl) == NULL + || DECL_INITIAL (decl) == error_mark_node) + ret = SECCAT_BSS; + else if (! TREE_READONLY (decl) + || TREE_SIDE_EFFECTS (decl) + || ! TREE_CONSTANT (DECL_INITIAL (decl))) + { + if (shlib && (reloc & 2)) + ret = SECCAT_DATA_REL; + else if (shlib && reloc) + ret = SECCAT_DATA_REL_LOCAL; + else + ret = SECCAT_DATA; + } + else if (shlib && (reloc & 2)) + ret = SECCAT_DATA_REL_RO; + else if (shlib && reloc) + ret = SECCAT_DATA_REL_RO_LOCAL; + else if (reloc || flag_merge_constants < 2) + /* C and C++ don't allow different variables to share the same + location. -fmerge-all-constants allows even that (at the + expense of not conforming). */ + ret = SECCAT_RODATA; + else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST) + ret = SECCAT_RODATA_MERGE_STR_INIT; + else + ret = SECCAT_RODATA_MERGE_CONST; + } + else if (TREE_CODE (decl) == CONSTRUCTOR) + { + if ((shlib && reloc) + || TREE_SIDE_EFFECTS (decl) + || ! TREE_CONSTANT (decl)) + ret = SECCAT_DATA; + else + ret = SECCAT_RODATA; + } + else + ret = SECCAT_RODATA; + + /* There are no read-only thread-local sections. */ + if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl)) + { + if (ret == SECCAT_BSS) + ret = SECCAT_TBSS; + else + ret = SECCAT_TDATA; + } + + /* If the target uses small data sections, select it. */ + else if ((*targetm.in_small_data_p) (decl)) + { + if (ret == SECCAT_BSS) + ret = SECCAT_SBSS; + else if (targetm.have_srodata_section && ret == SECCAT_RODATA) + ret = SECCAT_SRODATA; + else + ret = SECCAT_SDATA; + } + + return ret; +} + +bool +decl_readonly_section (decl, reloc) + tree decl; + int reloc; +{ + return decl_readonly_section_1 (decl, reloc, flag_pic); +} + +bool +decl_readonly_section_1 (decl, reloc, shlib) + tree decl; + int reloc; + int shlib; +{ + switch (categorize_decl_for_section (decl, reloc, shlib)) + { + case SECCAT_RODATA: + case SECCAT_RODATA_MERGE_STR: + case SECCAT_RODATA_MERGE_STR_INIT: + case SECCAT_RODATA_MERGE_CONST: + case SECCAT_SRODATA: + return true; + break; + default: + return false; + break; + } +} + +/* Select a section based on the above categorization. */ + +void +default_elf_select_section (decl, reloc, align) + tree decl; + int reloc; + unsigned HOST_WIDE_INT align; +{ + default_elf_select_section_1 (decl, reloc, align, flag_pic); +} + +void +default_elf_select_section_1 (decl, reloc, align, shlib) + tree decl; + int reloc; + unsigned HOST_WIDE_INT align; + int shlib; +{ + switch (categorize_decl_for_section (decl, reloc, shlib)) + { + case SECCAT_TEXT: + /* We're not supposed to be called on FUNCTION_DECLs. */ + abort (); + case SECCAT_RODATA: + readonly_data_section (); + break; + case SECCAT_RODATA_MERGE_STR: + mergeable_string_section (decl, align, 0); + break; + case SECCAT_RODATA_MERGE_STR_INIT: + mergeable_string_section (DECL_INITIAL (decl), align, 0); + break; + case SECCAT_RODATA_MERGE_CONST: + mergeable_constant_section (DECL_MODE (decl), align, 0); + break; + case SECCAT_SRODATA: + named_section (NULL_TREE, ".sdata2", reloc); + break; + case SECCAT_DATA: + data_section (); + break; + case SECCAT_DATA_REL: + named_section (NULL_TREE, ".data.rel", reloc); + break; + case SECCAT_DATA_REL_LOCAL: + named_section (NULL_TREE, ".data.rel.local", reloc); + break; + case SECCAT_DATA_REL_RO: + named_section (NULL_TREE, ".data.rel.ro", reloc); + break; + case SECCAT_DATA_REL_RO_LOCAL: + named_section (NULL_TREE, ".data.rel.ro.local", reloc); + break; + case SECCAT_SDATA: + named_section (NULL_TREE, ".sdata", reloc); + break; + case SECCAT_TDATA: + named_section (NULL_TREE, ".tdata", reloc); + break; + case SECCAT_BSS: +#ifdef BSS_SECTION_ASM_OP + bss_section (); +#else + named_section (NULL_TREE, ".bss", reloc); +#endif + break; + case SECCAT_SBSS: + named_section (NULL_TREE, ".sbss", reloc); + break; + case SECCAT_TBSS: + named_section (NULL_TREE, ".tbss", reloc); + break; + default: + abort (); + } +} + +/* Construct a unique section name based on the decl name and the + categorization performed above. */ + +void +default_unique_section (decl, reloc) + tree decl; + int reloc; +{ + default_unique_section_1 (decl, reloc, flag_pic); +} + +void +default_unique_section_1 (decl, reloc, shlib) + tree decl; + int reloc; + int shlib; +{ + bool one_only = DECL_ONE_ONLY (decl); + const char *prefix, *name; + size_t nlen, plen; + char *string; + + switch (categorize_decl_for_section (decl, reloc, shlib)) + { + case SECCAT_TEXT: + prefix = one_only ? ".gnu.linkonce.t." : ".text."; + break; + case SECCAT_RODATA: + case SECCAT_RODATA_MERGE_STR: + case SECCAT_RODATA_MERGE_STR_INIT: + case SECCAT_RODATA_MERGE_CONST: + prefix = one_only ? ".gnu.linkonce.r." : ".rodata."; + break; + case SECCAT_SRODATA: + prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2."; + break; + case SECCAT_DATA: + case SECCAT_DATA_REL: + case SECCAT_DATA_REL_LOCAL: + case SECCAT_DATA_REL_RO: + case SECCAT_DATA_REL_RO_LOCAL: + prefix = one_only ? ".gnu.linkonce.d." : ".data."; + break; + case SECCAT_SDATA: + prefix = one_only ? ".gnu.linkonce.s." : ".sdata."; + break; + case SECCAT_BSS: + prefix = one_only ? ".gnu.linkonce.b." : ".bss."; + break; + case SECCAT_SBSS: + prefix = one_only ? ".gnu.linkonce.sb." : ".sbss."; + break; + case SECCAT_TDATA: + prefix = one_only ? ".gnu.linkonce.td." : ".tdata."; + break; + case SECCAT_TBSS: + prefix = one_only ? ".gnu.linkonce.tb." : ".tbss."; + break; + default: + abort (); + } + plen = strlen (prefix); + + name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); + name = (* targetm.strip_name_encoding) (name); + nlen = strlen (name); + + string = alloca (nlen + plen + 1); + memcpy (string, prefix, plen); + memcpy (string + plen, name, nlen + 1); + + DECL_SECTION_NAME (decl) = build_string (nlen + plen, string); +} + +void +default_select_rtx_section (mode, x, align) + enum machine_mode mode ATTRIBUTE_UNUSED; + rtx x; + unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED; +{ + if (flag_pic) + switch (GET_CODE (x)) + { + case CONST: + case SYMBOL_REF: + case LABEL_REF: + data_section (); + return; + + default: + break; + } + + readonly_data_section (); +} + +void +default_elf_select_rtx_section (mode, x, align) + enum machine_mode mode; + rtx x; + unsigned HOST_WIDE_INT align; +{ + /* ??? Handle small data here somehow. */ + + if (flag_pic) + switch (GET_CODE (x)) + { + case CONST: + case SYMBOL_REF: + named_section (NULL_TREE, ".data.rel.ro", 3); + return; + + case LABEL_REF: + named_section (NULL_TREE, ".data.rel.ro.local", 1); + return; + + default: + break; + } + + mergeable_constant_section (mode, align, 0); +} + +/* By default, we do nothing for encode_section_info, so we need not + do anything but discard the '*' marker. */ + +const char * +default_strip_name_encoding (str) + const char *str; +{ + return str + (*str == '*'); +} + +/* Assume ELF-ish defaults, since that's pretty much the most liberal + wrt cross-module name binding. */ + +bool +default_binds_local_p (exp) + tree exp; +{ + return default_binds_local_p_1 (exp, flag_pic); +} + +bool +default_binds_local_p_1 (exp, shlib) + tree exp; + int shlib; +{ + bool local_p; + + /* A non-decl is an entry in the constant pool. */ + if (!DECL_P (exp)) + local_p = true; + /* Static variables are always local. */ + else if (! TREE_PUBLIC (exp)) + local_p = true; + /* A variable is local if the user tells us so. */ + else if (decl_visibility (exp) != VISIBILITY_DEFAULT) + local_p = true; + /* Otherwise, variables defined outside this object may not be local. */ + else if (DECL_EXTERNAL (exp)) + local_p = false; + /* Linkonce and weak data are never local. */ + else if (DECL_ONE_ONLY (exp) || DECL_WEAK (exp)) + local_p = false; + /* If PIC, then assume that any global name can be overridden by + symbols resolved from other modules. */ + else if (shlib) + local_p = false; + /* Uninitialized COMMON variable may be unified with symbols + resolved from other modules. */ + else if (DECL_COMMON (exp) + && (DECL_INITIAL (exp) == NULL + || DECL_INITIAL (exp) == error_mark_node)) + local_p = false; + /* Otherwise we're left with initialized (or non-common) global data + which is of necessity defined locally. */ + else + local_p = true; + + return local_p; +} + +/* Default function to output code that will globalize a label. A + target must define GLOBAL_ASM_OP or provide it's own function to + globalize a label. */ +#ifdef GLOBAL_ASM_OP +void +default_globalize_label (stream, name) + FILE * stream; + const char *name; +{ + fputs (GLOBAL_ASM_OP, stream); + assemble_name (stream, name); + putc ('\n', stream); +} +#endif /* GLOBAL_ASM_OP */ + +#include "gt-varasm.h" |
