Adjust offset before querying inline information for samples that begin at exit frames

runtime/vm/profiler_service.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/log.h"
 #include "vm/native_symbol.h"
 #include "vm/object.h"
@@ skipping 1435 matching lines @@
     if (!code.IsNull()) {
       intptr_t offset = pc - code.EntryPoint();
       if (frame_index != 0) {
         // The PC of frames below the top frame is a call's return address,
         // which can belong to a different inlining interval than the call.
         offset--;
       } else if (sample->IsAllocationSample()) {
         // Allocation samples skip the top frame, so the top frame's pc is
         // also a call's return address.
         offset--;
+      } else if (!sample->first_frame_executing()) {
+        // If the first frame wasn't executing code (i.e. we started to collect
+        // the stack trace at an exit frame), the top frame's pc is also a
+        // call's return address.
+        offset--;
       }
       code.GetInlinedFunctionsAt(offset,
                                  &inlined_functions,
                                  &inlined_token_positions);
       token_position = code.GetTokenPositionAt(offset);
       if (inlined_functions.length() > 0) {
         // The inlined token position table does not include the token position
         // of the final call. Insert it at the beginning because the table.
         // is reversed.
         inlined_token_positions.InsertAt(0, token_position);
@@ skipping 1076 matching lines @@
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart