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* configure.ac: Check for sys/mman.h and mmap. Check for mremap

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with MREMAP_MAYMOVE.
	* output.h (class Output_file): Add map_is_allocated_ field.
	* output.cc: Only #include <sys/mman.h> if it exists.  If mmap is
	not available, provide stubs.  If mremap is not available, #define
	it to gold_mremap.
	(MREMAP_MAYMOVE): Define if not defined.
	(Output_file::Output_file): Initialize map_is_allocated_.
	(Output_file::resize): Check map_is_allocated_.
	(Output_file::map_anonymous): If mmap fails, use malloc.
	(Output_file::unmap): Don't do anything for an anonymous map.
	* fileread.cc: Only #include <sys/mman.h> if it exists.  If mmap
	is not available, provide stubs.
	(File_read::View::~View): Use free rather than delete[].
	(File_read::make_view): Use malloc rather than new[].  If mmap
	fails, use malloc.
	(File_read::find_or_make_view): Use malloc rather than new[].
	* gold.h: Remove HAVE_REMAP code.
	* mremap.c: #include <errno.h>.  Only #include <sys/mman.h> if it
	exists.  Rename mremap to gold_mremap.  If mmap is not available
	don't do anything.
	* configure, config.in: Rebuild.
This commit is contained in:
Ian Lance Taylor
2011-04-12 18:06:16 +00:00
parent 32a946987b
commit 88597d3422
9 changed files with 317 additions and 54 deletions
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116
gold/output.cc
View File

@ -1,6 +1,6 @@
// output.cc -- manage the output file for gold
// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
@ -27,9 +27,13 @@
#include <cerrno>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <algorithm>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include "libiberty.h"
#include "parameters.h"
@ -40,11 +44,71 @@
#include "descriptors.h"
#include "output.h"
// For systems without mmap support.
#ifndef HAVE_MMAP
# define mmap gold_mmap
# define munmap gold_munmap
# define mremap gold_mremap
# ifndef MAP_FAILED
# define MAP_FAILED (reinterpret_cast<void*>(-1))
# endif
# ifndef PROT_READ
# define PROT_READ 0
# endif
# ifndef PROT_WRITE
# define PROT_WRITE 0
# endif
# ifndef MAP_PRIVATE
# define MAP_PRIVATE 0
# endif
# ifndef MAP_ANONYMOUS
# define MAP_ANONYMOUS 0
# endif
# ifndef MAP_SHARED
# define MAP_SHARED 0
# endif
# ifndef ENOSYS
# define ENOSYS EINVAL
# endif
static void *
gold_mmap(void *, size_t, int, int, int, off_t)
{
errno = ENOSYS;
return MAP_FAILED;
}
static int
gold_munmap(void *, size_t)
{
errno = ENOSYS;
return -1;
}
static void *
gold_mremap(void *, size_t, size_t, int)
{
errno = ENOSYS;
return MAP_FAILED;
}
#endif
#if defined(HAVE_MMAP) && !defined(HAVE_MREMAP)
# define mremap gold_mremap
extern "C" void *gold_mremap(void *, size_t, size_t, int);
#endif
// Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
#ifndef MAP_ANONYMOUS
# define MAP_ANONYMOUS MAP_ANON
#endif
#ifndef MREMAP_MAYMOVE
# define MREMAP_MAYMOVE 1
#endif
#ifndef HAVE_POSIX_FALLOCATE
// A dummy, non general, version of posix_fallocate. Here we just set
// the file size and hope that there is enough disk space. FIXME: We
@ -4415,6 +4479,7 @@ Output_file::Output_file(const char* name)
file_size_(0),
base_(NULL),
map_is_anonymous_(false),
map_is_allocated_(false),
is_temporary_(false)
{
}
@ -4522,10 +4587,23 @@ Output_file::resize(off_t file_size)
// to unmap to flush to the file, then remap after growing the file.
if (this->map_is_anonymous_)
{
void* base = ::mremap(this->base_, this->file_size_, file_size,
MREMAP_MAYMOVE);
if (base == MAP_FAILED)
gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno));
void* base;
if (!this->map_is_allocated_)
{
base = ::mremap(this->base_, this->file_size_, file_size,
MREMAP_MAYMOVE);
if (base == MAP_FAILED)
gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno));
}
else
{
base = realloc(this->base_, file_size);
if (base == NULL)
gold_nomem();
if (file_size > this->file_size_)
memset(static_cast<char*>(base) + this->file_size_, 0,
file_size - this->file_size_);
}
this->base_ = static_cast<unsigned char*>(base);
this->file_size_ = file_size;
}
@ -4546,13 +4624,17 @@ Output_file::map_anonymous()
{
void* base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (base != MAP_FAILED)
if (base == MAP_FAILED)
{
this->map_is_anonymous_ = true;
this->base_ = static_cast<unsigned char*>(base);
return true;
base = malloc(this->file_size_);
if (base == NULL)
return false;
memset(base, 0, this->file_size_);
this->map_is_allocated_ = true;
}
return false;
this->base_ = static_cast<unsigned char*>(base);
this->map_is_anonymous_ = true;
return true;
}
// Map the file into memory. Return whether the mapping succeeded.
@ -4624,8 +4706,16 @@ Output_file::map()
void
Output_file::unmap()
{
if (::munmap(this->base_, this->file_size_) < 0)
gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
if (this->map_is_anonymous_)
{
// We've already written out the data, so there is no reason to
// waste time unmapping or freeing the memory.
}
else
{
if (::munmap(this->base_, this->file_size_) < 0)
gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
}
this->base_ = NULL;
}