[inspector] Introduce translation of wasm frames

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 9094 matching lines @@
       if (script->type() != i::Script::TYPE_NORMAL) continue;
       if (script->HasValidSource()) {
         i::HandleScope handle_scope(isolate);
         i::Handle<i::Script> script_handle(script, isolate);
         scripts.Append(ToApiHandle<Script>(script_handle));
       }
     }
   }
 }
 
+std::pair<std::string, std::vector<std::tuple<uint32_t, int, int>>>

[Yang, 2016/11/16 20:41:12]

I have absolutely no idea what type I'm looking at. Are we really doing this
because of include rules? Can't we define this as a struct in a src/wasm/, and
include it in debug-interface.h?

[Clemens Hammacher, 2016/11/16 22:43:31]

We can either do this, or clean it up a bit by typedefs/using-declarations in a
follow-up commit.

+DebugInterface::DisassembleWasmFunction(Isolate* v8_isolate,
+                                        Local<Object> v8_script,
+                                        int function_index) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
+  if (v8_script.IsEmpty()) return {};
+  i::Handle<i::Object> script_wrapper = Utils::OpenHandle(*v8_script);
+  if (!script_wrapper->IsJSValue()) return {};
+  i::Handle<i::Object> script_obj(
+      i::Handle<i::JSValue>::cast(script_wrapper)->value(), isolate);
+  if (!script_obj->IsScript()) return {};
+  i::Handle<i::Script> script = i::Handle<i::Script>::cast(script_obj);
+  if (script->type() != i::Script::TYPE_WASM) return {};
+  i::Handle<i::WasmCompiledModule> compiled_module(
+      i::WasmCompiledModule::cast(script->wasm_compiled_module()), isolate);
+  return i::wasm::DisassembleFunction(compiled_module, function_index);
+}
+
 Local<String> CpuProfileNode::GetFunctionName() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   i::Isolate* isolate = node->isolate();
   const i::CodeEntry* entry = node->entry();
   i::Handle<i::String> name =
       isolate->factory()->InternalizeUtf8String(entry->name());
   if (!entry->has_name_prefix()) {
     return ToApiHandle<String>(name);
   } else {
     // We do not expect this to fail. Change this if it does.
@@ skipping 668 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8