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* csu/initfini.c (_init): Call __gmon_start__ if defined (weak ref).

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* csu/gmon-start.c (__gmon_start__): Renamed from gmon_start, made
	global.
	[! HAVE_INITFINI]: Only make it a constructor in this case.
This commit is contained in:
Roland McGrath 1996-01-17 02:29:57 +00:00
parent d99d7e2644
commit 5f3d5c2bbb
3 changed files with 28 additions and 4 deletions
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5
ChangeLog
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@ -1,5 +1,10 @@
Tue Jan 16 17:37:39 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* csu/initfini.c (_init): Call __gmon_start__ if defined (weak ref).
* csu/gmon-start.c (__gmon_start__): Renamed from gmon_start, made
global.
[! HAVE_INITFINI]: Only make it a constructor in this case.
* gmon/Makefile (CFLAGS-mcount.c): New variable.
(mcount.po): New target.

16
csu/gmon-start.c
View file

@ -1,5 +1,5 @@
/* Code to enable profiling at program startup.
Copyright (C) 1995 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -30,12 +30,20 @@ extern void _start (), etext ();
extern void monstartup (u_long, u_long);
extern void _mcleanup (void);
#ifndef HAVE_INITFINI
/* This function gets called at startup by the normal constructor
mechanism. We link this file together with start.o to produce gcrt1.o,
so this constructor will be first in the list. */
static void gmon_start (void) __attribute__ ((constructor));
static void
gmon_start (void)
void __gmon_start__ (void) __attribute__ ((constructor));
#else
/* In ELF and COFF, we cannot use the normal constructor mechanism to call
__gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
Instead crti.o calls it specially (see initfini.c). */
#endif
void
__gmon_start__ (void)
{
/* Start keeping profiling records. */
monstartup ((u_long) &_start, (u_long) &etext);

11
csu/initfini.c
View file

@ -63,6 +63,17 @@ SECTION (".init")
void
_init (void)
{
/* We cannot use the normal constructor mechanism in gcrt1.o because it
appears before crtbegin.o in the link, so the header elt of .ctors
would come after the elt for __gmon_start__. One approach is for
gcrt1.o to reference a symbol which would be defined by some library
module which has a constructor; but then user code's constructors
would come first, and not be profiled. */
extern void __gmon_start__ (void) __attribute__ ((weak));
weak_symbol (__gmon_start__)
if (&__gmon_start__)
__gmon_start__ ();
/* End the here document containing the .init prologue code.
Then fetch the .section directive just written and append that
to crtn.s-new, followed by the function epilogue. */