| // Copyright 2012 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "partition_alloc/partition_alloc_base/debug/stack_trace.h" |
| |
| #include "build/build_config.h" |
| #include "partition_alloc/partition_alloc_base/debug/debugging_buildflags.h" |
| #include "partition_alloc/partition_alloc_base/numerics/safe_conversions.h" |
| |
| // Surprisingly, uClibc defines __GLIBC__ in some build configs, but |
| // execinfo.h and backtrace(3) are really only present in glibc and in macOS |
| // libc. |
| #if BUILDFLAG(IS_APPLE) || \ |
| (defined(__GLIBC__) && !defined(__UCLIBC__) && !defined(__AIX)) |
| #define HAVE_BACKTRACE |
| #include <execinfo.h> |
| #endif |
| |
| namespace partition_alloc::internal::base::debug { |
| |
| size_t CollectStackTrace(const void** trace, size_t count) { |
| // NOTE: This code MUST be async-signal safe (it's used by in-process |
| // stack dumping signal handler). NO malloc or stdio is allowed here. |
| |
| #if BUILDFLAG(IS_APPLE) && defined(HAVE_BACKTRACE) |
| // Regarding Apple, no /proc is available. Try backtrace API. |
| // Though the backtrace API man page does not list any possible negative |
| // return values, we take no chance. |
| return base::saturated_cast<size_t>( |
| backtrace(const_cast<void**>(trace), base::saturated_cast<int>(count))); |
| #else |
| // Not able to obtain stack traces. |
| return 0; |
| #endif |
| } |
| |
| } // namespace partition_alloc::internal::base::debug |
