1 // Copyright (c) 2005 - 2007, Google Inc.
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5 // modification, are permitted provided that the following conditions are
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30 // Author: Arun Sharma
32 // Produce stack trace using libgcc
35 #include <stdlib.h> // for NULL
36 #include <unwind.h> // ABI defined unwinder
38 #include "stacktrace.h"
40 _START_GOOGLE_NAMESPACE_
50 // Workaround for the malloc() in _Unwind_Backtrace() issue.
51 static _Unwind_Reason_Code nop_backtrace(struct _Unwind_Context *uc, void *opq) {
52 return _URC_NO_REASON;
56 // This code is not considered ready to run until
57 // static initializers run so that we are guaranteed
58 // that any malloc-related initialization is done.
59 static bool ready_to_run = false;
60 class StackTraceInit {
63 // Extra call to force initialization
64 _Unwind_Backtrace(nop_backtrace, NULL);
69 static StackTraceInit module_initializer; // Force initialization
71 static _Unwind_Reason_Code GetOneFrame(struct _Unwind_Context *uc, void *opq) {
72 trace_arg_t *targ = (trace_arg_t *) opq;
74 if (targ->skip_count > 0) {
77 targ->result[targ->count++] = (void *) _Unwind_GetIP(uc);
80 if (targ->count == targ->max_depth)
81 return _URC_END_OF_STACK;
83 return _URC_NO_REASON;
86 // If you change this function, also change GetStackFrames below.
87 int GetStackTrace(void** result, int max_depth, int skip_count) {
93 skip_count += 1; // Do not include the "GetStackTrace" frame
96 targ.max_depth = max_depth;
97 targ.skip_count = skip_count;
100 _Unwind_Backtrace(GetOneFrame, &targ);
105 _END_GOOGLE_NAMESPACE_