[wasm] prototype for breakpoint support.

src/factory.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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 2220 matching lines @@
     str = DoubleToCString(num, buffer);
   }
 
   // We tenure the allocated string since it is referenced from the
   // number-string cache which lives in the old space.
   Handle<String> js_string = NewStringFromAsciiChecked(str, TENURED);
   SetNumberStringCache(number, js_string);
   return js_string;
 }
 
-
-Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
+Handle<DebugInfo> Factory::NewDebugInfo(Handle<AbstractCode> code) {
   // Allocate initial fixed array for active break points before allocating the
   // debug info object to avoid allocation while setting up the debug info
   // object.
   Handle<FixedArray> break_points(
       NewFixedArray(DebugInfo::kEstimatedNofBreakPointsInFunction));
 
-  // Create and set up the debug info object. Debug info contains function, a
-  // copy of the original code, the executing code and initial fixed array for
-  // active break points.
+  // Create and set up the debug info object.
   Handle<DebugInfo> debug_info =
       Handle<DebugInfo>::cast(NewStruct(DEBUG_INFO_TYPE));
-  debug_info->set_shared(*shared);
+  debug_info->set_abstract_code(*code);
+  debug_info->set_break_points(*break_points);
+
+  return debug_info;
+}
+
+Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
+  AbstractCode* code;
   if (shared->HasBytecodeArray()) {
     // We need to create a copy, but delay since this may cause heap
     // verification.
-    debug_info->set_abstract_code(AbstractCode::cast(shared->bytecode_array()));
+    code = AbstractCode::cast(shared->bytecode_array());
   } else {
-    debug_info->set_abstract_code(AbstractCode::cast(shared->code()));
+    code = AbstractCode::cast(shared->code());
   }
-  debug_info->set_break_points(*break_points);
+
+  Handle<DebugInfo> debug_info = NewDebugInfo(handle(code));
+  debug_info->set_shared(*shared);
   if (shared->HasBytecodeArray()) {
     // Create a copy for debugging.
     Handle<BytecodeArray> original(shared->bytecode_array());
     Handle<BytecodeArray> copy = CopyBytecodeArray(original);
     debug_info->set_abstract_code(AbstractCode::cast(*copy));
   }
 
   // Link debug info to function.
   shared->set_debug_info(*debug_info);
 
@@ skipping 119 matching lines @@
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 }  // namespace internal
 }  // namespace v8