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* mremap.c: New file.

Browse Source 
* configure.ac: Call AC_REPLACE_FUNCS on mremap.
	* gold.h (MREMAP_MAYMOVE): Define if HAVE_MREMAP is not defined.
	(mremap): Declare if HAVE_MREMAP is not defined.
	* configure, Makefile.in, config.in: Rebuild.
This commit is contained in:
Ian Lance Taylor
2009-03-27 23:21:09 +00:00
parent 10e1b6bb90
commit 2f35ab9b82
7 changed files with 78 additions and 3 deletions
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8
gold/ChangeLog
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@ -1,3 +1,11 @@
2009-03-27 Ian Lance Taylor <iant@google.com>
* mremap.c: New file.
* configure.ac: Call AC_REPLACE_FUNCS on mremap.
* gold.h (MREMAP_MAYMOVE): Define if HAVE_MREMAP is not defined.
(mremap): Declare if HAVE_MREMAP is not defined.
* configure, Makefile.in, config.in: Rebuild.
2009-03-27 Cary Coutant <ccoutant@google.com>
* powerpc.cc (Target_powerpc::check_non_pic): Assert that output is

3
gold/Makefile.in
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@ -50,7 +50,7 @@ DIST_COMMON = README $(am__configure_deps) $(srcdir)/../config.guess \
$(srcdir)/../mkinstalldirs $(srcdir)/Makefile.am \
$(srcdir)/Makefile.in $(srcdir)/config.in \
$(top_srcdir)/configure $(top_srcdir)/po/Make-in ChangeLog \
NEWS TODO ftruncate.c pread.c yyscript.c yyscript.h
NEWS TODO ftruncate.c mremap.c pread.c yyscript.c yyscript.h
subdir = .
ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
@ -536,6 +536,7 @@ distclean-compile:
-rm -f *.tab.c
@AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/ftruncate.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/mremap.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/pread.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/archive.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/binary.Po@am__quote@

3
gold/config.in
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@ -46,6 +46,9 @@
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the `mremap' function. */
#undef HAVE_MREMAP
/* Define if compiler supports #pragma omp threadprivate */
#undef HAVE_OMP_SUPPORT

3
gold/configure vendored
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@ -5167,7 +5167,8 @@ done
for ac_func in pread ftruncate
for ac_func in pread ftruncate mremap
do
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
echo "$as_me:$LINENO: checking for $ac_func" >&5

2
gold/configure.ac
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@ -312,7 +312,7 @@ LFS_CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
AC_SUBST(LFS_CFLAGS)
AC_CHECK_FUNCS(chsize)
AC_REPLACE_FUNCS(pread ftruncate)
AC_REPLACE_FUNCS(pread ftruncate mremap)
# Link in zlib if we can. This allows us to write compressed sections.
AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])

5
gold/gold.h
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@ -125,6 +125,11 @@ extern "C" ssize_t pread(int, void*, size_t, off_t);
extern "C" int ftruncate(int, off_t);
#endif
#ifndef HAVE_MREMAP
#define MREMAP_MAYMOVE 1
extern "C" void *mremap (void *, size_t, size_t, int, ...);
#endif
namespace gold
{

57
gold/mremap.c Normal file
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@ -0,0 +1,57 @@
/* mremap.c -- version of mremap for gold. */
/* Copyright 2009 Free Software Foundation, Inc.
Written by Ian Lance Taylor <iant@google.com>.
This file is part of gold.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "config.h"
#include "ansidecl.h"
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
/* This file implements mremap for systems which don't have it. The
gold code requires support for mmap. However, there are systems
which have mmap but not mremap. This is not a general replacement
for mremap; it only supports the features which are required for
gold. In particular, we assume that the MREMAP_MAYMOVE flag is
set. */
/* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS. */
#ifndef MAP_ANONYMOUS
# define MAP_ANONYMOUS MAP_ANON
#endif
void *
mremap (void *old_address, size_t old_size, size_t new_size,
int flags ATTRIBUTE_UNUSED, ...)
{
void *ret;
ret = mmap (0, new_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (ret == MAP_FAILED)
return ret;
memcpy (ret, old_address,
old_size < new_size ? old_size : new_size);
(void) munmap (old_address, old_size);
return ret;
}