[wasm] Implement stepping in wasm code

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 733 matching lines @@
 RUNTIME_FUNCTION(Runtime_GetScopeCount) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
   CHECK(isolate->debug()->CheckExecutionState(break_id));
 
   CONVERT_SMI_ARG_CHECKED(wrapped_id, 1);
 
   // Get the frame where the debugging is performed.
   StackFrame::Id id = DebugFrameHelper::UnwrapFrameId(wrapped_id);
-  JavaScriptFrameIterator it(isolate, id);
-  JavaScriptFrame* frame = it.frame();
+  StackTraceFrameIterator it(isolate, id);
+  StandardFrame* frame = it.frame();
+  if (it.frame()->is_wasm()) return 0;
+
   FrameInspector frame_inspector(frame, 0, isolate);
 
   // Count the visible scopes.
   int n = 0;
   for (ScopeIterator it(isolate, &frame_inspector); !it.Done(); it.Next()) {
     n++;
   }
 
   return Smi::FromInt(n);
 }
@@ skipping 13 matching lines @@
   DCHECK_EQ(4, args.length());
   CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
   CHECK(isolate->debug()->CheckExecutionState(break_id));
 
   CONVERT_SMI_ARG_CHECKED(wrapped_id, 1);
   CONVERT_NUMBER_CHECKED(int, inlined_jsframe_index, Int32, args[2]);
   CONVERT_NUMBER_CHECKED(int, index, Int32, args[3]);
 
   // Get the frame where the debugging is performed.
   StackFrame::Id id = DebugFrameHelper::UnwrapFrameId(wrapped_id);
-  JavaScriptFrameIterator frame_it(isolate, id);
-  JavaScriptFrame* frame = frame_it.frame();
+  StackTraceFrameIterator frame_it(isolate, id);
+  // Wasm has no scopes, this must be javascript.
+  JavaScriptFrame* frame = JavaScriptFrame::cast(frame_it.frame());
   FrameInspector frame_inspector(frame, inlined_jsframe_index, isolate);
 
   // Find the requested scope.
   int n = 0;
   ScopeIterator it(isolate, &frame_inspector);
   for (; !it.Done() && n < index; it.Next()) {
     n++;
   }
   if (it.Done()) {
     return isolate->heap()->undefined_value();
@@ skipping 167 matching lines @@
   bool res;
   if (args[0]->IsNumber()) {
     CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
     CHECK(isolate->debug()->CheckExecutionState(break_id));
 
     CONVERT_SMI_ARG_CHECKED(wrapped_id, 1);
     CONVERT_NUMBER_CHECKED(int, inlined_jsframe_index, Int32, args[2]);
 
     // Get the frame where the debugging is performed.
     StackFrame::Id id = DebugFrameHelper::UnwrapFrameId(wrapped_id);
-    JavaScriptFrameIterator frame_it(isolate, id);
-    JavaScriptFrame* frame = frame_it.frame();
+    StackTraceFrameIterator frame_it(isolate, id);
+    // Wasm has no scopes, this must be javascript.
+    JavaScriptFrame* frame = JavaScriptFrame::cast(frame_it.frame());
     FrameInspector frame_inspector(frame, inlined_jsframe_index, isolate);
 
     ScopeIterator it(isolate, &frame_inspector);
     res = SetScopeVariableValue(&it, index, variable_name, new_value);
   } else if (args[0]->IsJSFunction()) {
     CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
     ScopeIterator it(isolate, fun);
     res = SetScopeVariableValue(&it, index, variable_name, new_value);
   } else {
     CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, gen, 0);
@@ skipping 936 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8