Index: third_party/tcmalloc/chromium/src/libc_override_osx.h |
diff --git a/third_party/tcmalloc/chromium/src/libc_override_osx.h b/third_party/tcmalloc/chromium/src/libc_override_osx.h |
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index 0000000000000000000000000000000000000000..78a0ef2f95974b4d02e75dceaa716f75592d1e0a |
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+// 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_ |