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@ -1,6 +1,6 @@ |
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/* Support macros for making weak and strong aliases for symbols,
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and for using symbol sets and linker warnings with GNU ld. |
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Copyright (C) 1995-1998,2000-2006,2008,2009,2011 |
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Copyright (C) 1995-1998,2000-2006,2008,2009,2011,2012 |
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Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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@ -32,7 +32,6 @@ |
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* ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'. |
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* ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type, |
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or leave it undefined if there is no .type directive. |
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* HAVE_ELF if using ELF, which supports weak symbols using `.weak'. |
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* HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'. |
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* HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'. |
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@ -54,8 +53,7 @@ |
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#include <config.h> |
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/* The symbols in all the user (non-_) macros are C symbols.
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NO HAVE_ELF implies a.out. */ |
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/* The symbols in all the user (non-_) macros are C symbols. */ |
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#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE |
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# define HAVE_WEAK_SYMBOLS |
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@ -222,51 +220,35 @@ |
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/* When a reference to SYMBOL is encountered, the linker will emit a
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warning message MSG. */ |
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#ifdef HAVE_ELF |
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/* We want the .gnu.warning.SYMBOL section to be unallocated. */ |
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# ifdef HAVE_ASM_PREVIOUS_DIRECTIVE |
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# define __make_section_unallocated(section_string) \ |
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#ifdef HAVE_ASM_PREVIOUS_DIRECTIVE |
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# define __make_section_unallocated(section_string) \ |
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asm (".section " section_string "\n\t.previous"); |
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# elif defined HAVE_ASM_POPSECTION_DIRECTIVE |
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# define __make_section_unallocated(section_string) \ |
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#elif defined HAVE_ASM_POPSECTION_DIRECTIVE |
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# define __make_section_unallocated(section_string) \ |
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asm (".pushsection " section_string "\n\t.popsection"); |
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# else |
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# define __make_section_unallocated(section_string) |
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# endif |
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#else |
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# define __make_section_unallocated(section_string) |
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#endif |
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/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
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section attributes on what looks like a comment to the assembler. */ |
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# ifdef HAVE_SECTION_QUOTES |
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# define __sec_comment "\"\n\t#\"" |
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# else |
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# define __sec_comment "\n\t#" |
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# endif |
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# define link_warning(symbol, msg) \ |
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#ifdef HAVE_SECTION_QUOTES |
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# define __sec_comment "\"\n\t#\"" |
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#else |
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# define __sec_comment "\n\t#" |
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#endif |
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#define link_warning(symbol, msg) \ |
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__make_section_unallocated (".gnu.warning." #symbol) \ |
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static const char __evoke_link_warning_##symbol[] \ |
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__attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \ |
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= msg; |
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# define libc_freeres_ptr(decl) \ |
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#define libc_freeres_ptr(decl) \ |
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__make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \ |
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decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment))) |
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# define __libc_freeres_fn_section \ |
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#define __libc_freeres_fn_section \ |
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__attribute__ ((section ("__libc_freeres_fn"))) |
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#else /* Not ELF: a.out */ |
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# ifdef HAVE_XCOFF |
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/* XCOFF does not support .stabs.
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The native aix linker will remove the .stab and .stabstr sections |
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The gnu linker will have a fatal error if there is a relocation for |
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symbol in the .stab section. Silently disable this macro. */ |
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# define link_warning(symbol, msg) |
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# else |
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# define link_warning(symbol, msg) \ |
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asm (".stabs \"" msg "\",30,0,0,0\n\t" \ |
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".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n"); |
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# endif /* XCOFF */ |
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# define libc_freeres_ptr(decl) decl |
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# define __libc_freeres_fn_section |
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#endif |
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#define libc_freeres_fn(name) \ |
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static void name (void) __attribute_used__ __libc_freeres_fn_section; \ |
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text_set_element (__libc_subfreeres, name); \ |
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@ -337,77 +319,50 @@ for linking") |
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/* Symbol set support macros. */ |
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#ifdef HAVE_ELF |
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/* Make SYMBOL, which is in the text segment, an element of SET. */ |
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# define text_set_element(set, symbol) _elf_set_element(set, symbol) |
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#define text_set_element(set, symbol) _elf_set_element(set, symbol) |
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/* Make SYMBOL, which is in the data segment, an element of SET. */ |
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# define data_set_element(set, symbol) _elf_set_element(set, symbol) |
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#define data_set_element(set, symbol) _elf_set_element(set, symbol) |
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/* Make SYMBOL, which is in the bss segment, an element of SET. */ |
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# define bss_set_element(set, symbol) _elf_set_element(set, symbol) |
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#define bss_set_element(set, symbol) _elf_set_element(set, symbol) |
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/* These are all done the same way in ELF.
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There is a new section created for each set. */ |
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# ifdef SHARED |
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#ifdef SHARED |
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/* When building a shared library, make the set section writable,
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because it will need to be relocated at run time anyway. */ |
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# define _elf_set_element(set, symbol) \ |
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# define _elf_set_element(set, symbol) \ |
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static const void *__elf_set_##set##_element_##symbol##__ \ |
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__attribute__ ((used, section (#set))) = &(symbol) |
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# else |
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# define _elf_set_element(set, symbol) \ |
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#else |
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# define _elf_set_element(set, symbol) \ |
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static const void *const __elf_set_##set##_element_##symbol##__ \ |
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__attribute__ ((used, section (#set))) = &(symbol) |
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# endif |
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#endif |
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/* Define SET as a symbol set. This may be required (it is in a.out) to
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be able to use the set's contents. */ |
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# define symbol_set_define(set) symbol_set_declare(set) |
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#define symbol_set_define(set) symbol_set_declare(set) |
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/* Declare SET for use in this module, if defined in another module.
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In a shared library, this is always local to that shared object. |
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For static linking, the set might be wholly absent and so we use |
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weak references. */ |
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# define symbol_set_declare(set) \ |
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#define symbol_set_declare(set) \ |
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extern char const __start_##set[] __symbol_set_attribute; \ |
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extern char const __stop_##set[] __symbol_set_attribute; |
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# ifdef SHARED |
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# define __symbol_set_attribute attribute_hidden |
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# else |
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# define __symbol_set_attribute __attribute__ ((weak)) |
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# endif |
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#ifdef SHARED |
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# define __symbol_set_attribute attribute_hidden |
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#else |
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# define __symbol_set_attribute __attribute__ ((weak)) |
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#endif |
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/* Return a pointer (void *const *) to the first element of SET. */ |
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# define symbol_set_first_element(set) ((void *const *) (&__start_##set)) |
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#define symbol_set_first_element(set) ((void *const *) (&__start_##set)) |
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/* Return true iff PTR (a void *const *) has been incremented
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past the last element in SET. */ |
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# define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set) |
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#else /* Not ELF: a.out. */ |
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# ifdef HAVE_XCOFF |
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/* XCOFF does not support .stabs.
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The native aix linker will remove the .stab and .stabstr sections |
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The gnu linker will have a fatal error if there is a relocation for |
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symbol in the .stab section. Silently disable these macros. */ |
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# define text_set_element(set, symbol) |
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# define data_set_element(set, symbol) |
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# define bss_set_element(set, symbol) |
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# else |
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# define text_set_element(set, symbol) \ |
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asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol) |
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# define data_set_element(set, symbol) \ |
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asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol) |
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# define bss_set_element(set, symbol) ?error Must use initialized data. |
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# endif /* XCOFF */ |
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# define symbol_set_define(set) void *const (set)[1]; |
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# define symbol_set_declare(set) extern void *const (set)[1]; |
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# define symbol_set_first_element(set) &(set)[1] |
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# define symbol_set_end_p(set, ptr) (*(ptr) == 0) |
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#endif /* ELF. */ |
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#define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set) |
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#if DO_VERSIONING |
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# define symbol_version(real, name, version) \ |
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Ulrich Drepper
14 years ago