[debug] remove StepFrame

src/runtime/runtime-debug.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
@@ skipping 1164 matching lines @@
   CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
   CHECK(isolate->debug()->CheckExecutionState(break_id));
 
   if (!args[1]->IsNumber()) {
     return isolate->Throw(isolate->heap()->illegal_argument_string());
   }
 
   // Get the step action and check validity.
   StepAction step_action = static_cast<StepAction>(NumberToInt32(args[1]));
   if (step_action != StepIn && step_action != StepNext &&
-      step_action != StepOut && step_action != StepFrame) {
+      step_action != StepOut) {
     return isolate->Throw(isolate->heap()->illegal_argument_string());
   }
 
   // Clear all current stepping setup.
   isolate->debug()->ClearStepping();
 
   // Prepare step.
   isolate->debug()->PrepareStep(static_cast<StepAction>(step_action));
   return isolate->heap()->undefined_value();
 }
 
-RUNTIME_FUNCTION(Runtime_PrepareStepFrame) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(0, args.length());
-  CHECK(isolate->debug()->CheckExecutionState());
-
-  // Clear all current stepping setup.
-  isolate->debug()->ClearStepping();
-
-  // Prepare step.
-  isolate->debug()->PrepareStep(StepFrame);
-  return isolate->heap()->undefined_value();
-}
-
 // Clear all stepping set by PrepareStep.
 RUNTIME_FUNCTION(Runtime_ClearStepping) {
   HandleScope scope(isolate);
   DCHECK_EQ(0, args.length());
   CHECK(isolate->debug()->is_active());
   isolate->debug()->ClearStepping();
   return isolate->heap()->undefined_value();
 }
 
 
@@ skipping 703 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8