[wasm] Implement WebAssembly.validate()

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index a65b357bbb558fa5d12b46937f7d60c7e67a9fde..5685d25c3da33491644584a4643671251ccb7883 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -1813,6 +1813,15 @@ MaybeHandle<JSObject> CreateModuleObjectFromBytes(Isolate* isolate,
                                     origin);
 }
 
+bool ValidateModuleBytes(Isolate* isolate, const byte* start, const byte* end,
+                         ErrorThrower* thrower, ModuleOrigin origin) {
+  Zone zone(isolate->allocator());
+  ModuleResult result =
+      DecodeWasmModule(isolate, &zone, start, end, false, origin);
+  if (result.val) delete result.val;

[Mircea Trofin, 2016/09/29 16:47:49]

if (result.val != nullptr) or even:

if (result.ok) {
  DCHECK_NOT_NULL(result.val);
  delete result.val;
}

+  return result.ok();
+}
+
 MaybeHandle<JSArrayBuffer> GetInstanceMemory(Isolate* isolate,
                                              Handle<JSObject> instance) {
   Object* mem = instance->GetInternalField(kWasmMemArrayBuffer);