Index: third_party/tcmalloc/chromium/src/libc_override_osx.h |
=================================================================== |
--- third_party/tcmalloc/chromium/src/libc_override_osx.h (revision 124832) |
+++ third_party/tcmalloc/chromium/src/libc_override_osx.h (working copy) |
@@ -1,275 +0,0 @@ |
-// Copyright (c) 2011, 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: Craig Silverstein <opensource@google.com> |
-// |
-// Used to override malloc routines on OS X systems. We use the |
-// malloc-zone functionality built into OS X to register our malloc |
-// routine. |
-// |
-// 1) We used to use the normal 'override weak libc malloc/etc' |
-// technique for OS X. This is not optimal because mach does not |
-// support the 'alias' attribute, so we had to have forwarding |
-// functions. It also does not work very well with OS X shared |
-// libraries (dylibs) -- in general, the shared libs don't use |
-// tcmalloc unless run with the DYLD_FORCE_FLAT_NAMESPACE envvar. |
-// |
-// 2) Another approach would be to use an interposition array: |
-// static const interpose_t interposers[] __attribute__((section("__DATA, __interpose"))) = { |
-// { (void *)tc_malloc, (void *)malloc }, |
-// { (void *)tc_free, (void *)free }, |
-// }; |
-// This requires the user to set the DYLD_INSERT_LIBRARIES envvar, so |
-// is not much better. |
-// |
-// 3) Registering a new malloc zone avoids all these issues: |
-// http://www.opensource.apple.com/source/Libc/Libc-583/include/malloc/malloc.h |
-// http://www.opensource.apple.com/source/Libc/Libc-583/gen/malloc.c |
-// If we make tcmalloc the default malloc zone (undocumented but |
-// possible) then all new allocs use it, even those in shared |
-// libraries. Allocs done before tcmalloc was installed, or in libs |
-// that aren't using tcmalloc for some reason, will correctly go |
-// through the malloc-zone interface when free-ing, and will pick up |
-// the libc free rather than tcmalloc free. So it should "never" |
-// cause a crash (famous last words). |
-// |
-// 4) The routines one must define for one's own malloc have changed |
-// between OS X versions. This requires some hoops on our part, but |
-// is only really annoying when it comes to posix_memalign. The right |
-// behavior there depends on what OS version tcmalloc was compiled on, |
-// but also what OS version the program is running on. For now, we |
-// punt and don't implement our own posix_memalign. Apps that really |
-// care can use tc_posix_memalign directly. |
- |
-#ifndef TCMALLOC_LIBC_OVERRIDE_OSX_INL_H_ |
-#define TCMALLOC_LIBC_OVERRIDE_OSX_INL_H_ |
- |
-#include <config.h> |
-#ifdef HAVE_FEATURES_H |
-#include <features.h> |
-#endif |
-#include <gperftools/tcmalloc.h> |
- |
-#if !defined(__APPLE__) |
-# error libc_override_glibc-osx.h is for OS X distributions only. |
-#endif |
- |
-#include <AvailabilityMacros.h> |
-#include <malloc/malloc.h> |
- |
-// from AvailabilityMacros.h |
-#if defined(MAC_OS_X_VERSION_10_6) && \ |
- MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6 |
-extern "C" { |
- // This function is only available on 10.6 (and later) but the |
- // LibSystem headers do not use AvailabilityMacros.h to handle weak |
- // importing automatically. This prototype is a copy of the one in |
- // <malloc/malloc.h> with the WEAK_IMPORT_ATTRBIUTE added. |
- extern malloc_zone_t *malloc_default_purgeable_zone(void) |
- WEAK_IMPORT_ATTRIBUTE; |
-} |
-#endif |
- |
-// We need to provide wrappers around all the libc functions. |
-namespace { |
-size_t mz_size(malloc_zone_t* zone, const void* ptr) { |
- if (MallocExtension::instance()->GetOwnership(ptr) != MallocExtension::kOwned) |
- return 0; // malloc_zone semantics: return 0 if we don't own the memory |
- |
- // TODO(csilvers): change this method to take a const void*, one day. |
- return MallocExtension::instance()->GetAllocatedSize(const_cast<void*>(ptr)); |
-} |
- |
-void* mz_malloc(malloc_zone_t* zone, size_t size) { |
- return tc_malloc(size); |
-} |
- |
-void* mz_calloc(malloc_zone_t* zone, size_t num_items, size_t size) { |
- return tc_calloc(num_items, size); |
-} |
- |
-void* mz_valloc(malloc_zone_t* zone, size_t size) { |
- return tc_valloc(size); |
-} |
- |
-void mz_free(malloc_zone_t* zone, void* ptr) { |
- return tc_free(ptr); |
-} |
- |
-void* mz_realloc(malloc_zone_t* zone, void* ptr, size_t size) { |
- return tc_realloc(ptr, size); |
-} |
- |
-void* mz_memalign(malloc_zone_t* zone, size_t align, size_t size) { |
- return tc_memalign(align, size); |
-} |
- |
-void mz_destroy(malloc_zone_t* zone) { |
- // A no-op -- we will not be destroyed! |
-} |
- |
-// malloc_introspection callbacks. I'm not clear on what all of these do. |
-kern_return_t mi_enumerator(task_t task, void *, |
- unsigned type_mask, vm_address_t zone_address, |
- memory_reader_t reader, |
- vm_range_recorder_t recorder) { |
- // Should enumerate all the pointers we have. Seems like a lot of work. |
- return KERN_FAILURE; |
-} |
- |
-size_t mi_good_size(malloc_zone_t *zone, size_t size) { |
- // I think it's always safe to return size, but we maybe could do better. |
- return size; |
-} |
- |
-boolean_t mi_check(malloc_zone_t *zone) { |
- return MallocExtension::instance()->VerifyAllMemory(); |
-} |
- |
-void mi_print(malloc_zone_t *zone, boolean_t verbose) { |
- int bufsize = 8192; |
- if (verbose) |
- bufsize = 102400; // I picked this size arbitrarily |
- char* buffer = new char[bufsize]; |
- MallocExtension::instance()->GetStats(buffer, bufsize); |
- fprintf(stdout, "%s", buffer); |
- delete[] buffer; |
-} |
- |
-void mi_log(malloc_zone_t *zone, void *address) { |
- // I don't think we support anything like this |
-} |
- |
-void mi_force_lock(malloc_zone_t *zone) { |
- // Hopefully unneeded by us! |
-} |
- |
-void mi_force_unlock(malloc_zone_t *zone) { |
- // Hopefully unneeded by us! |
-} |
- |
-void mi_statistics(malloc_zone_t *zone, malloc_statistics_t *stats) { |
- // TODO(csilvers): figure out how to fill these out |
- stats->blocks_in_use = 0; |
- stats->size_in_use = 0; |
- stats->max_size_in_use = 0; |
- stats->size_allocated = 0; |
-} |
- |
-boolean_t mi_zone_locked(malloc_zone_t *zone) { |
- return false; // Hopefully unneeded by us! |
-} |
- |
-} // unnamed namespace |
- |
-// OS X doesn't have pvalloc, cfree, malloc_statc, etc, so we can just |
-// define our own. :-) OS X supplies posix_memalign in some versions |
-// but not others, either strongly or weakly linked, in a way that's |
-// difficult enough to code to correctly, that I just don't try to |
-// support either memalign() or posix_memalign(). If you need them |
-// and are willing to code to tcmalloc, you can use tc_posix_memalign(). |
-extern "C" { |
- void cfree(void* p) { tc_cfree(p); } |
- void* pvalloc(size_t s) { return tc_pvalloc(s); } |
- void malloc_stats(void) { tc_malloc_stats(); } |
- int mallopt(int cmd, int v) { return tc_mallopt(cmd, v); } |
- // No struct mallinfo on OS X, so don't define mallinfo(). |
- // An alias for malloc_size(), which OS X defines. |
- size_t malloc_usable_size(void* p) { return tc_malloc_size(p); } |
-} // extern "C" |
- |
-static void ReplaceSystemAlloc() { |
- static malloc_introspection_t tcmalloc_introspection; |
- memset(&tcmalloc_introspection, 0, sizeof(tcmalloc_introspection)); |
- |
- tcmalloc_introspection.enumerator = &mi_enumerator; |
- tcmalloc_introspection.good_size = &mi_good_size; |
- tcmalloc_introspection.check = &mi_check; |
- tcmalloc_introspection.print = &mi_print; |
- tcmalloc_introspection.log = &mi_log; |
- tcmalloc_introspection.force_lock = &mi_force_lock; |
- tcmalloc_introspection.force_unlock = &mi_force_unlock; |
- |
- static malloc_zone_t tcmalloc_zone; |
- memset(&tcmalloc_zone, 0, sizeof(malloc_zone_t)); |
- |
- // Start with a version 4 zone which is used for OS X 10.4 and 10.5. |
- tcmalloc_zone.version = 4; |
- tcmalloc_zone.zone_name = "tcmalloc"; |
- tcmalloc_zone.size = &mz_size; |
- tcmalloc_zone.malloc = &mz_malloc; |
- tcmalloc_zone.calloc = &mz_calloc; |
- tcmalloc_zone.valloc = &mz_valloc; |
- tcmalloc_zone.free = &mz_free; |
- tcmalloc_zone.realloc = &mz_realloc; |
- tcmalloc_zone.destroy = &mz_destroy; |
- tcmalloc_zone.batch_malloc = NULL; |
- tcmalloc_zone.batch_free = NULL; |
- tcmalloc_zone.introspect = &tcmalloc_introspection; |
- |
- // from AvailabilityMacros.h |
-#if defined(MAC_OS_X_VERSION_10_6) && \ |
- MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6 |
- // Switch to version 6 on OSX 10.6 to support memalign. |
- tcmalloc_zone.version = 6; |
- tcmalloc_zone.free_definite_size = NULL; |
- tcmalloc_zone.memalign = &mz_memalign; |
- tcmalloc_introspection.zone_locked = &mi_zone_locked; |
- |
- // Request the default purgable zone to force its creation. The |
- // current default zone is registered with the purgable zone for |
- // doing tiny and small allocs. Sadly, it assumes that the default |
- // zone is the szone implementation from OS X and will crash if it |
- // isn't. By creating the zone now, this will be true and changing |
- // the default zone won't cause a problem. This only needs to |
- // happen when actually running on OS X 10.6 and higher (note the |
- // ifdef above only checks if we were *compiled* with 10.6 or |
- // higher; at runtime we have to check if this symbol is defined.) |
- if (malloc_default_purgeable_zone) { |
- malloc_default_purgeable_zone(); |
- } |
-#endif |
- |
- // Register the tcmalloc zone. At this point, it will not be the |
- // default zone. |
- malloc_zone_register(&tcmalloc_zone); |
- |
- // Unregister and reregister the default zone. Unregistering swaps |
- // the specified zone with the last one registered which for the |
- // default zone makes the more recently registered zone the default |
- // zone. The default zone is then re-registered to ensure that |
- // allocations made from it earlier will be handled correctly. |
- // Things are not guaranteed to work that way, but it's how they work now. |
- malloc_zone_t *default_zone = malloc_default_zone(); |
- malloc_zone_unregister(default_zone); |
- malloc_zone_register(default_zone); |
-} |
- |
-#endif // TCMALLOC_LIBC_OVERRIDE_OSX_INL_H_ |