Dump more stack frames to perf log when executing a C++ function.

src/log.cc

 // Copyright 2006-2008 the V8 project authors. 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
@@ skipping 119 matching lines @@
   static bool paused_;
 };
 
 bool Profiler::paused_ = false;
 
 
 //
 // StackTracer implementation
 //
 void StackTracer::Trace(TickSample* sample) {
-  // Assuming that stack grows from lower addresses
-  if (sample->state != GC
-      && (sample->sp < sample->fp && sample->fp < low_stack_bound_)) {
+  if (sample->state == GC) {
+    sample->InitStack(0);
+    return;
+  }
+
+  // If c_entry_fp is available, this means that we are inside a C++
+  // function and sample->fp value isn't reliable due to FPO
+  if (Top::c_entry_fp(Top::GetCurrentThread()) != NULL) {
+    SafeStackTraceFrameIterator it(
+        reinterpret_cast<Address>(sample->sp),
+        reinterpret_cast<Address>(low_stack_bound_));
+    // Pass 1: Calculate depth
+    int depth = 0;
+    while (!it.done() && depth <= kMaxStackFrames) {
+      ++depth;
+      it.Advance();
+    }
+    // Pass 2: Save stack
+    sample->InitStack(depth);
+    if (depth > 0) {
+      it.Reset();
+      for (int i = 0; i < depth && !it.done(); ++i, it.Advance()) {
+        sample->stack[i] = it.frame()->pc();
+      }
+    }
+  } else if (sample->sp < sample->fp && sample->fp < low_stack_bound_) {
+    // The check assumes that stack grows from lower addresses
     sample->InitStack(1);
     sample->stack[0] = Memory::Address_at(
         (Address)(sample->fp + StandardFrameConstants::kCallerPCOffset));
   } else {
-    // GC runs or FP seems to be in some intermediate state,
+    // FP seems to be in some intermediate state,
     // better discard this sample
     sample->InitStack(0);
   }
 }
 
 
 //
 // Ticker used to provide ticks to the profiler and the sliding state
 // window.
 //
@@ skipping 980 matching lines @@
   if (FLAG_log_state_changes) {
     LOG(UncheckedStringEvent("Leaving", StateToString(state_)));
     if (previous_) {
       LOG(UncheckedStringEvent("To", StateToString(previous_->state_)));
     }
   }
 }
 #endif
 
 } }  // namespace v8::internal