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| #include "config.h" |
| |
| #define THIS_IS_MALLOC_BACKTRACE_CC |
| #include "malloc_backtrace.h" |
| |
| #include "thread_cache_ptr.h" |
| |
| extern "C" { |
| void* tc_new(size_t); |
| void tc_delete(void*); |
| } |
| |
| namespace tcmalloc { |
| |
| // GrabBacktrace is the API to use when capturing backtrace for |
| // various tcmalloc features. It has optional emergency malloc |
| // integration for occasional case where stacktrace capturing method |
| // calls back to malloc (so we divert those calls to emergency malloc |
| // facility). |
| ATTRIBUTE_HIDDEN ATTRIBUTE_NOINLINE |
| int GrabBacktrace(void** result, int max_depth, int skip_count) { |
| struct Args { |
| void** result; |
| int max_depth; |
| int skip_count; |
| int result_depth; |
| } args; |
| |
| args.result = result; |
| args.max_depth = max_depth; |
| args.skip_count = skip_count; |
| args.result_depth = 0; |
| |
| struct Body { |
| static ATTRIBUTE_NOINLINE |
| void Run(bool stacktrace_allowed, void* _args) { |
| Args* args = static_cast<Args*>(_args); |
| if (!stacktrace_allowed) { |
| return; |
| } |
| |
| #if (!defined(NDEBUG) || defined(TCMALLOC_FORCE_BAD_TLS)) && defined(ENABLE_EMERGENCY_MALLOC) |
| // Lets ensure test coverage of emergency malloc even in |
| // configurations that otherwise don't exercise it. |
| (tc_delete)(tc_new(32)); |
| #endif |
| |
| args->result_depth = GetStackTrace(args->result, args->max_depth, args->skip_count + 3); |
| } |
| }; |
| |
| ThreadCachePtr::WithStacktraceScope(Body::Run, &args); |
| |
| // Prevent tail calling WithStacktraceScope above |
| return *const_cast<volatile int*>(&args.result_depth); |
| } |
| |
| } // namespace tcmalloc |