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defaults.h (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER): New macro.

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* defaults.h (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER): New
	macro.
	* tm.texi (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER):
	Document it.
	* toplev.c (main): If the target does not allow profiling without
	a frame pointer, issue an error message.
	* config/i386/linux.h (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER):
	Define it to false.

From-SVN: r42312
This commit is contained in:
Mark Mitchell 2001-05-19 17:56:48 +00:00 • committed by Mark Mitchell
parent e86f9f3267
commit 4da5f005d4
5 changed files with 62 additions and 0 deletions
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21
gcc/ChangeLog
View file

@ -1,3 +1,14 @@
2001-05-19 Mark Mitchell <mark@codesourcery.com>
* defaults.h (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER): New
macro.
* tm.texi (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER):
Document it.
* toplev.c (main): If the target does not allow profiling without
a frame pointer, issue an error message.
* config/i386/linux.h (TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER):
Define it to false.
Sat May 19 07:53:42 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* recog.c (general_operand): Modify last change to allow it if reload
@ -102,6 +113,16 @@ Fri May 18 15:39:16 CEST 2001 Jan Hubicka <jh@suse.cz>
2001-05-18 Mark Mitchell <mark@codesourcery.com>
* basic-block.h (struct basic_block_def): Add documentation about
what a basic block is, and what the various fields are used for.
* flow.c (calculate_globlal_regs_live): Add documentation about
how the algorithm works, and how we know that it will terminate.
Check that the the inductive assumption that guarantees
termination actually holds.
(mark_used_regs): Treat conditionally set registers as used.
(debug_regset): Add comment.
* rtl.texi (cond_exec): Add documentation.
* function.c (expand_function_start): Avoid creating BLKmode
pseudos.

9
gcc/config/i386/linux.h
View file

@ -73,6 +73,15 @@ Boston, MA 02111-1307, USA. */
fprintf (FILE, "\tcall\tmcount\n"); \
}
/* True if it is possible to profile code that does not have a frame
pointer.
The GLIBC version of mcount for the x86 assumes that there is a
frame, so we cannot allow profiling without a frame pointer. */
#undef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER false
#undef SIZE_TYPE
#define SIZE_TYPE "unsigned int"

7
gcc/defaults.h
View file

@ -336,5 +336,12 @@ do { \
? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
#endif
/* True if it is possible to profile code that does not have a frame
pointer. */
#ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
#endif
#endif /* GCC_DEFAULTS_H */

15
gcc/tm.texi
View file

@ -3992,6 +3992,21 @@ Registers or condition codes clobbered by @code{FUNCTION_PROLOGUE} or
@item BLOCK_PROFILER_CODE
A C function or functions which are needed in the library to
support block profiling.
@findex TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
@item TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
On some targets, it is impossible to use profiling when the frame
pointer has been omitted. For example, on x86 GNU/Linux systems,
the @code{mcount} routine provided by the GNU C Library finds the
address of the routine that called the routine that called @code{mcount}
by looking in the immediate caller's stack frame. If the immediate
caller has no frame pointer, this lookup will fail.
By default, GCC assumes that the target does allow profiling when the
frame pointer is omitted. This macro should be defined to a C
expression that evaluates to @code{false} if the target does not allow
profiling when the frame pointer is omitted.
@end table
@node Inlining

10
gcc/toplev.c
View file

@ -4932,6 +4932,16 @@ toplev_main (argc, argv)
warning ("this target machine does not have delayed branches");
#endif
/* Some operating systems do not allow profiling without a frame
pointer. */
if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
&& profile_flag
&& flag_omit_frame_pointer)
{
error ("profiling does not work without a frame pointer");
flag_omit_frame_pointer = 0;
}
user_label_prefix = USER_LABEL_PREFIX;
if (flag_leading_underscore != -1)
{