[wasm] Always provide a wasm instance object at runtime

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/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
@@ skipping 508 matching lines @@
 
   if (it.is_wasm()) {
     // Create the details array (no dynamic information for wasm).
     Handle<FixedArray> details =
         isolate->factory()->NewFixedArray(kFrameDetailsFirstDynamicIndex);
 
     // Add the frame id.
     details->set(kFrameDetailsFrameIdIndex, *frame_id);
 
     // Add the function name.
-    Handle<Object> wasm_instance_or_undef(it.wasm_frame()->wasm_instance(),
-                                          isolate);
+    Handle<WasmCompiledModule> compiled_module(
+        it.wasm_frame()->wasm_instance()->get_compiled_module(), isolate);
     int func_index = it.wasm_frame()->function_index();
-    Handle<String> func_name =
-        wasm::GetWasmFunctionName(isolate, wasm_instance_or_undef, func_index);
+    Handle<String> func_name = WasmCompiledModule::GetFunctionName(
+        isolate, compiled_module, func_index);
     details->set(kFrameDetailsFunctionIndex, *func_name);
 
     // Add the script wrapper
     Handle<Object> script_wrapper =
         Script::GetWrapper(frame_inspector.GetScript());
     details->set(kFrameDetailsScriptIndex, *script_wrapper);
 
     // Add the arguments count.
     details->set(kFrameDetailsArgumentCountIndex, Smi::kZero);
 
     // Add the locals count
     details->set(kFrameDetailsLocalCountIndex, Smi::kZero);
 
     // Add the source position.
     // For wasm, it is function-local, so translate it to a module-relative
     // position, such that together with the script it uniquely identifies the
     // position.
     Handle<Object> positionValue;
-    if (position != kNoSourcePosition &&
-        !wasm_instance_or_undef->IsUndefined(isolate)) {
+    if (position != kNoSourcePosition) {
       int translated_position = position;
-      if (!wasm::WasmIsAsmJs(*wasm_instance_or_undef, isolate)) {
-        Handle<WasmCompiledModule> compiled_module(
-            WasmInstanceObject::cast(*wasm_instance_or_undef)
-                ->get_compiled_module(),
-            isolate);
+      // No further translation needed for asm.js modules.
+      if (!compiled_module->is_asm_js()) {
         translated_position +=
             wasm::GetFunctionCodeOffset(compiled_module, func_index);
       }
       details->set(kFrameDetailsSourcePositionIndex,
                    Smi::FromInt(translated_position));
     }
 
     // Add the constructor information.
     details->set(kFrameDetailsConstructCallIndex, heap->ToBoolean(false));
 
@@ skipping 1353 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8