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attributes weak and alias 

From-SVN: r9391
This commit is contained in:
Jason Merrill 1995-04-16 06:14:00 +00:00
parent 822e3422fb
commit 4b8af8d984
5 changed files with 138 additions and 17 deletions
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27
gcc/c-common.c
View File

@ -30,7 +30,7 @@ extern struct obstack permanent_obstack;
enum attrs {A_PACKED, A_NOCOMMON, A_NORETURN, A_CONST, A_T_UNION,
A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
A_FORMAT};
A_FORMAT, A_WEAK, A_ALIAS};
static void declare_hidden_char_array PROTO((char *, char *));
static void add_attribute PROTO((enum attrs, char *,
@ -258,6 +258,8 @@ init_attributes ()
add_attribute (A_SECTION, "section", 1, 1, 1);
add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
add_attribute (A_FORMAT, "format", 3, 3, 1);
add_attribute (A_WEAK, "weak", 0, 0, 1);
add_attribute (A_ALIAS, "alias", 1, 1, 1);
}
/* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
@ -606,6 +608,29 @@ decl_attributes (node, attributes, prefix_attributes)
is_scan, format_num, first_arg_num);
break;
}
case A_WEAK:
declare_weak (decl);
break;
case A_ALIAS:
if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
|| TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl))
error_with_decl (decl,
"`%s' defined both normally and as an alias");
else if (decl_function_context (decl) == 0)
{
tree id = get_identifier (TREE_STRING_POINTER
(TREE_VALUE (args)));
if (TREE_CODE (decl) == FUNCTION_DECL)
DECL_INITIAL (decl) = error_mark_node;
else
DECL_EXTERNAL (decl) = 0;
assemble_alias (decl, id);
}
else
warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
break;
}
}
}

15
gcc/config/aoutos.h
View File

@ -85,3 +85,18 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
fputc ('\n', FILE); \
} \
} while (0)
/* If we're using GNU as and ld, we support weak symbols. */
#define HANDLE_PRAGMA_WEAK flag_gnu_linker
#define WEAK_ASM_OP ".weak"
#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
do { if (flag_gnu_linker) \
{ \
fprintf ((FILE), "\t%s\t", ".set"); \
assemble_name (FILE, LABEL1); \
fprintf (FILE, ","); \
assemble_name (FILE, LABEL2); \
fprintf (FILE, "\n"); \
} \
} while (0)

15
gcc/config/sparc/sunos4.h
View File

@ -20,3 +20,18 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define SUNOS4_SHARED_LIBRARIES 1
#include "sparc/sparc.h"
/* If we're using GNU as and ld, we support weak symbols. */
#define HANDLE_PRAGMA_WEAK flag_gnu_linker
#define WEAK_ASM_OP ".weak"
#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
do { if (flag_gnu_linker) \
{ \
fprintf ((FILE), "\t%s\t", ".set"); \
assemble_name (FILE, LABEL1); \
fprintf (FILE, ","); \
assemble_name (FILE, LABEL2); \
fprintf (FILE, "\n"); \
} \
} while (0)

4
gcc/toplev.c
View File

@ -2574,6 +2574,10 @@ compile_file (name)
}
}
/* Write out any pending weak symbol declarations. */
weak_finish ();
/* Do dbx symbols */
#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)

94
gcc/varasm.c
View File

@ -97,8 +97,13 @@ int size_directive_output;
tree last_assemble_variable_decl;
/* Nonzero if at least one function definition has been seen. */
static int function_defined;
/* Any weak symbol declarations waiting to be emitted. */
static tree weak_decls;
struct addr_const;
struct constant_descriptor;
struct rtx_const;
@ -3911,12 +3916,13 @@ output_constructor (exp, size)
assemble_zeros (size - total_bytes);
}
#ifdef HANDLE_SYSV_PRAGMA
/* Support #pragma weak by default if WEAK_ASM_OP and ASM_OUTPUT_DEF
are defined. */
#if defined (WEAK_ASM_OP) && defined (ASM_OUTPUT_DEF)
#if !defined (HANDLE_PRAGMA_WEAK) && defined (WEAK_ASM_OP) && defined (ASM_OUTPUT_DEF)
#define HANDLE_PRAGMA_WEAK 1
#endif
#if defined (HANDLE_SYSV_PRAGMA) && defined (HANDLE_PRAGMA_WEAK)
/* See c-pragma.c for an identical definition. */
enum pragma_state
@ -3943,21 +3949,77 @@ handle_pragma_weak (what, asm_out_file, name, value)
{
if (what == ps_name || what == ps_value)
{
fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP);
if (output_bytecode)
BC_OUTPUT_LABELREF (asm_out_file, name);
else
ASM_OUTPUT_LABELREF (asm_out_file, name);
fputc ('\n', asm_out_file);
if (what == ps_value)
ASM_OUTPUT_DEF (asm_out_file, name, value);
weak_decls = perm_tree_cons (what == ps_value ? value : NULL_TREE,
name, weak_decls);
}
else if (! (what == ps_done || what == ps_start))
warning ("malformed `#pragma weak'");
}
#endif /* HANDLE_PRAGMA_WEAK or (WEAK_ASM_OP and SET_ASM_OP) */
#endif /* HANDLE_SYSV_PRAGMA && HANDLE_PRAGMA_WEAK */
#endif /* WEAK_ASM_OP && ASM_OUTPUT_DEF */
/* Declare DECL to be a weak symbol. */
void
declare_weak (decl)
tree decl;
{
if (! TREE_PUBLIC (decl))
error_with_decl (decl, "weak declaration of `%s' must be public");
else
weak_decls = perm_tree_cons (NULL_TREE, DECL_ASSEMBLER_NAME (decl),
weak_decls);
}
/* Emit any pending weak declarations. */
void
weak_finish ()
{
#ifdef HANDLE_PRAGMA_WEAK
if (HANDLE_PRAGMA_WEAK)
{
tree t;
for (t = weak_decls; t; t = TREE_CHAIN (t))
{
tree decl = TREE_VALUE (t);
char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP);
if (output_bytecode)
BC_OUTPUT_LABELREF (asm_out_file, name);
else
ASM_OUTPUT_LABELREF (asm_out_file, name);
fputc ('\n', asm_out_file);
}
}
#endif
}
void
assemble_alias (decl, target)
tree decl, target;
{
#ifdef ASM_OUTPUT_DEF
char *name;
make_decl_rtl (decl, (char*)0, 1);
name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
/* Make name accessible from other files, if appropriate. */
if (TREE_PUBLIC (decl))
{
if (output_bytecode)
BC_GLOBALIZE_LABEL (asm_out_file, name);
else
ASM_GLOBALIZE_LABEL (asm_out_file, name);
}
ASM_OUTPUT_DEF (asm_out_file, name, IDENTIFIER_POINTER (target));
#else
warning ("alias definitions not supported in this configuration");
#endif
}