Profiler: resolve top of stack address to a function

src/profile-generator.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/profile-generator.h"
 
 #include "src/compiler.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/global-handles.h"
@@ skipping 585 matching lines @@
   if (sample.pc != NULL) {
     if (sample.has_external_callback && sample.state == EXTERNAL &&
         sample.top_frame_type == StackFrame::EXIT) {
       // Don't use PC when in external callback code, as it can point
       // inside callback's code, and we will erroneously report
       // that a callback calls itself.
       *entry++ = code_map_.FindEntry(sample.external_callback);
     } else {
       Address start;
       CodeEntry* pc_entry = code_map_.FindEntry(sample.pc, &start);
+      // If there is no pc_entry we're likely in native code.
+      // Find out, if top of stack was pointing inside a JS function
+      // meaning that we have encountered a frameless invocation.
+      if (!pc_entry && (sample.top_frame_type == StackFrame::JAVA_SCRIPT ||
+                        sample.top_frame_type == StackFrame::OPTIMIZED)) {
+        pc_entry = code_map_.FindEntry(sample.tos);
+      }
       // If pc is in the function code before it set up stack frame or after the
       // frame was destroyed SafeStackFrameIterator incorrectly thinks that
       // ebp contains return address of the current function and skips caller's
       // frame. Check for this case and just skip such samples.
       if (pc_entry) {
         List<OffsetRange>* ranges = pc_entry->no_frame_ranges();
         int pc_offset =
             static_cast<int>(sample.pc - pc_entry->instruction_start());
         if (ranges) {
           for (int i = 0; i < ranges->length(); i++) {
@@ skipping 78 matching lines @@
     case EXTERNAL:
       return program_entry_;
     case IDLE:
       return idle_entry_;
     default: return NULL;
   }
 }
 
 }  // namespace internal
 }  // namespace v8