Add function to trace stack using frame pointers.

base/debug/stack_trace.h

Index: base/debug/stack_trace.h
diff --git a/base/debug/stack_trace.h b/base/debug/stack_trace.h
index 07e119a16b4a255dc443acf28c37d0c5cefa25c2..49d123227938c15733cfc1676061117c6069533c 100644
--- a/base/debug/stack_trace.h
+++ b/base/debug/stack_trace.h
@@ -22,6 +22,12 @@ struct _EXCEPTION_POINTERS;
 struct _CONTEXT;
 #endif
 
+#if defined(OS_POSIX) && (defined(__i386__) || defined(__x86_64__))

[Nico, 2016/04/15 20:00:00]

do we still have any 32-bit posix platforms we need this on?

+#define HAVE_TRACE_STACK_FRAME_POINTERS 1
+#else
+#define HAVE_TRACE_STACK_FRAME_POINTERS 0
+#endif
+
 namespace base {
 namespace debug {
 
@@ -76,6 +82,8 @@ class BASE_EXPORT StackTrace {
   // Resolves backtrace to symbols and returns as string.
   std::string ToString() const;
 
+  static StackTrace FromFramePointers(size_t max_depth);
+
  private:
 #if defined(OS_WIN)
   void InitTrace(const _CONTEXT* context_record);
@@ -93,6 +101,20 @@ class BASE_EXPORT StackTrace {
   size_t count_;
 };
 
+#if HAVE_TRACE_STACK_FRAME_POINTERS
+// Traces the stack by using frame pointers. This function is faster but less
+// reliable than StackTrace. It should work for debug and profiling builds,
+// but not for release builds (although there are some exceptions).
+//
+// Writes at most |max_depth| frames (instruction pointers) into |out_trace|
+// after skipping |skip_initial| frames. Note that the function itself is not
+// added to the trace so |skip_initial| should be 0 in most cases.
+// Returns number of frames written.
+BASE_EXPORT size_t TraceStackFramePointers(const void** out_trace,

[Primiano Tucci (use gerrit), 2016/04/18 20:18:07]

it's a bit conflicting that you have two APIs publicly exposed (this one and
FromFramePointers).
Maybe you want only the one up and this one should be an internal function?

[Dmitry Skiba, 2016/04/20 16:32:56]

Actually, the top one is a mistake. Thanks for noticing!

+                                           size_t max_depth,
+                                           size_t skip_initial);
+#endif  // HAVE_TRACE_STACK_FRAME_POINTERS
+
 namespace internal {
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID)