Index: third_party/tcmalloc/chromium/src/malloc_hook_mmap_linux.h |
=================================================================== |
--- third_party/tcmalloc/chromium/src/malloc_hook_mmap_linux.h (revision 124832) |
+++ third_party/tcmalloc/chromium/src/malloc_hook_mmap_linux.h (working copy) |
@@ -1,241 +0,0 @@ |
-// Copyright (c) 2005, Google Inc. |
-// All rights reserved. |
-// |
-// Redistribution and use in source and binary forms, with or without |
-// modification, are permitted provided that the following conditions are |
-// met: |
-// |
-// * Redistributions of source code must retain the above copyright |
-// notice, this list of conditions and the following disclaimer. |
-// * Redistributions in binary form must reproduce the above |
-// copyright notice, this list of conditions and the following disclaimer |
-// in the documentation and/or other materials provided with the |
-// distribution. |
-// * Neither the name of Google Inc. nor the names of its |
-// contributors may be used to endorse or promote products derived from |
-// this software without specific prior written permission. |
-// |
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
- |
-// --- |
-// Author: Sanjay Ghemawat <opensource@google.com> |
- |
-// We define mmap() and mmap64(), which somewhat reimplements libc's mmap |
-// syscall stubs. Unfortunately libc only exports the stubs via weak symbols |
-// (which we're overriding with our mmap64() and mmap() wrappers) so we can't |
-// just call through to them. |
- |
-#ifndef __linux |
-# error Should only be including malloc_hook_mmap_linux.h on linux systems. |
-#endif |
- |
-#include <unistd.h> |
-#include <syscall.h> |
-#include <sys/mman.h> |
-#include <errno.h> |
-#include "base/linux_syscall_support.h" |
- |
-// The x86-32 case and the x86-64 case differ: |
-// 32b has a mmap2() syscall, 64b does not. |
-// 64b and 32b have different calling conventions for mmap(). |
- |
-// I test for 64-bit first so I don't have to do things like |
-// '#if (defined(__mips__) && !defined(__MIPS64__))' as a mips32 check. |
-#if defined(__x86_64__) || defined(__PPC64__) || (defined(_MIPS_SIM) && _MIPS_SIM == _ABI64) |
- |
-static inline void* do_mmap64(void *start, size_t length, |
- int prot, int flags, |
- int fd, __off64_t offset) __THROW { |
- // The original gperftools uses sys_mmap() here. But, it is not allowed by |
- // Chromium's sandbox. |
- return (void *)syscall(SYS_mmap, start, length, prot, flags, fd, offset); |
-} |
- |
-#define MALLOC_HOOK_HAVE_DO_MMAP64 1 |
- |
-#elif defined(__i386__) || defined(__PPC__) || defined(__mips__) || \ |
- defined(__arm__) |
- |
-static inline void* do_mmap64(void *start, size_t length, |
- int prot, int flags, |
- int fd, __off64_t offset) __THROW { |
- void *result; |
- |
- // Try mmap2() unless it's not supported |
- static bool have_mmap2 = true; |
- if (have_mmap2) { |
- static int pagesize = 0; |
- if (!pagesize) pagesize = getpagesize(); |
- |
- // Check that the offset is page aligned |
- if (offset & (pagesize - 1)) { |
- result = MAP_FAILED; |
- errno = EINVAL; |
- goto out; |
- } |
- |
- result = (void *)syscall(SYS_mmap2, |
- start, length, prot, flags, fd, |
- (off_t) (offset / pagesize)); |
- if (result != MAP_FAILED || errno != ENOSYS) goto out; |
- |
- // We don't have mmap2() after all - don't bother trying it in future |
- have_mmap2 = false; |
- } |
- |
- if (((off_t)offset) != offset) { |
- // If we're trying to map a 64-bit offset, fail now since we don't |
- // have 64-bit mmap() support. |
- result = MAP_FAILED; |
- errno = EINVAL; |
- goto out; |
- } |
- |
-#ifdef __NR_mmap |
- { |
- // Fall back to old 32-bit offset mmap() call |
- // Old syscall interface cannot handle six args, so pass in an array |
- int32 args[6] = { (int32) start, (int32) length, prot, flags, fd, |
- (off_t) offset }; |
- result = (void *)syscall(SYS_mmap, args); |
- } |
-#else |
- // Some Linux ports like ARM EABI Linux has no mmap, just mmap2. |
- result = MAP_FAILED; |
-#endif |
- |
- out: |
- return result; |
-} |
- |
-#define MALLOC_HOOK_HAVE_DO_MMAP64 1 |
- |
-#endif // #if defined(__x86_64__) |
- |
- |
-#ifdef MALLOC_HOOK_HAVE_DO_MMAP64 |
- |
-// We use do_mmap64 abstraction to put MallocHook::InvokeMmapHook |
-// calls right into mmap and mmap64, so that the stack frames in the caller's |
-// stack are at the same offsets for all the calls of memory allocating |
-// functions. |
- |
-// Put all callers of MallocHook::Invoke* in this module into |
-// malloc_hook section, |
-// so that MallocHook::GetCallerStackTrace can function accurately: |
- |
-// Make sure mmap doesn't get #define'd away by <sys/mman.h> |
-# undef mmap |
- |
-extern "C" { |
- void* mmap64(void *start, size_t length, int prot, int flags, |
- int fd, __off64_t offset ) __THROW |
- ATTRIBUTE_SECTION(malloc_hook); |
- void* mmap(void *start, size_t length,int prot, int flags, |
- int fd, off_t offset) __THROW |
- ATTRIBUTE_SECTION(malloc_hook); |
- int munmap(void* start, size_t length) __THROW |
- ATTRIBUTE_SECTION(malloc_hook); |
- void* mremap(void* old_addr, size_t old_size, size_t new_size, |
- int flags, ...) __THROW |
- ATTRIBUTE_SECTION(malloc_hook); |
- void* sbrk(ptrdiff_t increment) __THROW |
- ATTRIBUTE_SECTION(malloc_hook); |
-} |
- |
-extern "C" void* mmap64(void *start, size_t length, int prot, int flags, |
- int fd, __off64_t offset) __THROW { |
- MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset); |
- void *result; |
- if (!MallocHook::InvokeMmapReplacement( |
- start, length, prot, flags, fd, offset, &result)) { |
- result = do_mmap64(start, length, prot, flags, fd, offset); |
- } |
- MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset); |
- return result; |
-} |
- |
-# if !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH) |
- |
-extern "C" void* mmap(void *start, size_t length, int prot, int flags, |
- int fd, off_t offset) __THROW { |
- MallocHook::InvokePreMmapHook(start, length, prot, flags, fd, offset); |
- void *result; |
- if (!MallocHook::InvokeMmapReplacement( |
- start, length, prot, flags, fd, offset, &result)) { |
- result = do_mmap64(start, length, prot, flags, fd, |
- static_cast<size_t>(offset)); // avoid sign extension |
- } |
- MallocHook::InvokeMmapHook(result, start, length, prot, flags, fd, offset); |
- return result; |
-} |
- |
-# endif // !defined(__USE_FILE_OFFSET64) || !defined(__REDIRECT_NTH) |
- |
-extern "C" int munmap(void* start, size_t length) __THROW { |
- MallocHook::InvokeMunmapHook(start, length); |
- int result; |
- if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) { |
- // The original gperftools uses sys_munmap() here. But, it is not allowed |
- // by Chromium's sandbox. |
- result = syscall(SYS_munmap, start, length); |
- } |
- return result; |
-} |
- |
-extern "C" void* mremap(void* old_addr, size_t old_size, size_t new_size, |
- int flags, ...) __THROW { |
- va_list ap; |
- va_start(ap, flags); |
- void *new_address = va_arg(ap, void *); |
- va_end(ap); |
- // The original gperftools uses sys_mremap() here. But, it is not allowed by |
- // Chromium's sandbox. |
- void* result = (void *)syscall( |
- SYS_mremap, old_addr, old_size, new_size, flags, new_address); |
- MallocHook::InvokeMremapHook(result, old_addr, old_size, new_size, flags, |
- new_address); |
- return result; |
-} |
- |
-// libc's version: |
-extern "C" void* __sbrk(ptrdiff_t increment); |
- |
-extern "C" void* sbrk(ptrdiff_t increment) __THROW { |
- MallocHook::InvokePreSbrkHook(increment); |
- void *result = __sbrk(increment); |
- MallocHook::InvokeSbrkHook(result, increment); |
- return result; |
-} |
- |
-/*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot, |
- int flags, int fd, off_t offset) { |
- void* result; |
- if (!MallocHook::InvokeMmapReplacement( |
- start, length, prot, flags, fd, offset, &result)) { |
- result = do_mmap64(start, length, prot, flags, fd, offset); |
- } |
- return result; |
-} |
- |
-/*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) { |
- int result; |
- if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) { |
- result = syscall(SYS_munmap, start, length); |
- } |
- return result; |
-} |
- |
-#undef MALLOC_HOOK_HAVE_DO_MMAP64 |
- |
-#endif // #ifdef MALLOC_HOOK_HAVE_DO_MMAP64 |