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except.h (output_function_exception_table): Add 'const char*' param.

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* except.h (output_function_exception_table): Add 'const char*' param.
	* except.c (switch_to_exception_section): Add 'const char*' param.
	If named sections are supported and HAVE_LD_EH_GC_SECTIONS is defined
	and flag_function_sections is set, use a function-specific section.
	(output_function_exception_table): Add 'const char*' param.
	Adjust call to switch_to_exception_section.
	* final.c (rest_of_handle_final): Adjust calls to
	output_function_exception_table.
	* configure.ac (HAVE_LD_EH_GC_SECTIONS): New check.
	* config.in: Regenerate.
	* configure: Likewise.

From-SVN: r118107
This commit is contained in:
Eric Botcazou 2006-10-28 18:11:28 +00:00 • committed by Eric Botcazou
parent e73dbcaefc
commit 22ba88ef4b
7 changed files with 127 additions and 6 deletions
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14
gcc/ChangeLog
View file

@ -1,3 +1,17 @@
2006-10-28 Eric Botcazou <ebotcazou@adacore.com>
* except.h (output_function_exception_table): Add 'const char*' param.
* except.c (switch_to_exception_section): Add 'const char*' param.
If named sections are supported and HAVE_LD_EH_GC_SECTIONS is defined
and flag_function_sections is set, use a function-specific section.
(output_function_exception_table): Add 'const char*' param.
Adjust call to switch_to_exception_section.
* final.c (rest_of_handle_final): Adjust calls to
output_function_exception_table.
* configure.ac (HAVE_LD_EH_GC_SECTIONS): New check.
* config.in: Regenerate.
* configure: Likewise.
2006-10-28 Richard Guenther <rguenther@suse.de>
PR middle-end/26899

7
gcc/config.in
View file

@ -883,6 +883,13 @@
/* Define if your linker supports --eh-frame-hdr option. */
#undef HAVE_LD_EH_FRAME_HDR
/* Define if your linker supports garbage collection of sections in presence
of EH frames. */
#ifndef USED_FOR_TARGET
#undef HAVE_LD_EH_GC_SECTIONS
#endif
/* Define if your PowerPC64 linker only needs function descriptor syms. */
#ifndef USED_FOR_TARGET
#undef HAVE_LD_NO_DOT_SYMS

47
gcc/configure vendored
View file

@ -15889,6 +15889,53 @@ fi
echo "$as_me:$LINENO: result: $gcc_cv_ld_pie" >&5
echo "${ECHO_T}$gcc_cv_ld_pie" >&6
echo "$as_me:$LINENO: checking linker EH-compatible garbage collection of sections" >&5
echo $ECHO_N "checking linker EH-compatible garbage collection of sections... $ECHO_C" >&6
gcc_cv_ld_eh_gc_sections=no
if test $in_tree_ld = yes ; then
if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 17 -o "$gcc_cv_gld_major_version" -gt 2 \
&& test $in_tree_ld_is_elf = yes; then
gcc_cv_ld_eh_gc_sections=yes
fi
elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
cat > conftest.s <<EOF
.section .text
.globl _start
.type _start, @function
_start:
.long foo
.size _start, .-_start
.section .text.foo,"ax",@progbits
.type foo, @function
foo:
.long 0
.size foo, .-foo
.section .gcc_except_table.foo,"a",@progbits
.L0:
.long 0
.section .eh_frame,"a",@progbits
.long .L0
EOF
if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1; then
if $gcc_cv_ld -o conftest conftest.o --entry=_start --gc-sections 2>&1 \
| grep "gc-sections option ignored" > /dev/null; then
gcc_cv_ld_eh_gc_sections=no
elif $gcc_cv_objdump -h conftest | grep gcc_except_table > /dev/null; then
gcc_cv_ld_eh_gc_sections=yes
fi
fi
rm -f conftest.s conftest.o conftest
fi
if test x$gcc_cv_ld_eh_gc_sections = xyes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_LD_EH_GC_SECTIONS 1
_ACEOF
fi
echo "$as_me:$LINENO: result: $gcc_cv_ld_eh_gc_sections" >&5
echo "${ECHO_T}$gcc_cv_ld_eh_gc_sections" >&6
# --------
# UNSORTED
# --------

43
gcc/configure.ac
View file

@ -3119,6 +3119,49 @@ if test x"$gcc_cv_ld_pie" = xyes; then
fi
AC_MSG_RESULT($gcc_cv_ld_pie)
AC_MSG_CHECKING(linker EH-compatible garbage collection of sections)
gcc_cv_ld_eh_gc_sections=no
if test $in_tree_ld = yes ; then
if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 17 -o "$gcc_cv_gld_major_version" -gt 2 \
&& test $in_tree_ld_is_elf = yes; then
gcc_cv_ld_eh_gc_sections=yes
fi
elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
cat > conftest.s <<EOF
.section .text
.globl _start
.type _start, @function
_start:
.long foo
.size _start, .-_start
.section .text.foo,"ax",@progbits
.type foo, @function
foo:
.long 0
.size foo, .-foo
.section .gcc_except_table.foo,"a",@progbits
.L0:
.long 0
.section .eh_frame,"a",@progbits
.long .L0
EOF
if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1; then
if $gcc_cv_ld -o conftest conftest.o --entry=_start --gc-sections 2>&1 \
| grep "gc-sections option ignored" > /dev/null; then
gcc_cv_ld_eh_gc_sections=no
elif $gcc_cv_objdump -h conftest | grep gcc_except_table > /dev/null; then
gcc_cv_ld_eh_gc_sections=yes
fi
fi
rm -f conftest.s conftest.o conftest
fi
if test x$gcc_cv_ld_eh_gc_sections = xyes; then
AC_DEFINE(HAVE_LD_EH_GC_SECTIONS, 1,
[Define if your linker supports garbage collection of
sections in presence of EH frames.])
fi
AC_MSG_RESULT($gcc_cv_ld_eh_gc_sections)
# --------
# UNSORTED
# --------

16
gcc/except.c
View file

@ -3520,7 +3520,7 @@ sjlj_output_call_site_table (void)
/* Switch to the section that should be used for exception tables. */
static void
switch_to_exception_section (void)
switch_to_exception_section (const char * ARG_UNUSED (fnname))
{
if (exception_section == 0)
{
@ -3539,6 +3539,16 @@ switch_to_exception_section (void)
}
else
flags = SECTION_WRITE;
#ifdef HAVE_LD_EH_GC_SECTIONS
if (flag_function_sections)
{
char *section_name = xmalloc (strlen (fnname) + 32);
sprintf (section_name, ".gcc_except_table.%s", fnname);
exception_section = get_section (section_name, flags, NULL);
free (section_name);
}
else
#endif
exception_section = get_section (".gcc_except_table", flags, NULL);
}
else
@ -3599,7 +3609,7 @@ output_ttype (tree type, int tt_format, int tt_format_size)
}
void
output_function_exception_table (void)
output_function_exception_table (const char * ARG_UNUSED (fnname))
{
int tt_format, cs_format, lp_format, i, n;
#ifdef HAVE_AS_LEB128
@ -3627,7 +3637,7 @@ output_function_exception_table (void)
/* Note that varasm still thinks we're in the function's code section.
The ".endp" directive that will immediately follow will take us back. */
#else
switch_to_exception_section ();
switch_to_exception_section (fnname);
#endif
/* If the target wants a label to begin the table, emit it here. */

2
gcc/except.h
View file

@ -68,7 +68,7 @@ extern void convert_from_eh_region_ranges (void);
extern unsigned int convert_to_eh_region_ranges (void);
extern void find_exception_handler_labels (void);
extern bool current_function_has_exception_handlers (void);
extern void output_function_exception_table (void);
extern void output_function_exception_table (const char *);
extern void expand_builtin_unwind_init (void);
extern rtx expand_builtin_eh_return_data_regno (tree);

4
gcc/final.c
View file

@ -3920,14 +3920,14 @@ rest_of_handle_final (void)
#ifdef TARGET_UNWIND_INFO
/* ??? The IA-64 ".handlerdata" directive must be issued before
the ".endp" directive that closes the procedure descriptor. */
output_function_exception_table ();
output_function_exception_table (fnname);
#endif
assemble_end_function (current_function_decl, fnname);
#ifndef TARGET_UNWIND_INFO
/* Otherwise, it feels unclean to switch sections in the middle. */
output_function_exception_table ();
output_function_exception_table (fnname);
#endif
user_defined_section_attribute = false;