[wasm] Implement {Compile,Runtime}Error; fix traps from start function

R=ahaas@chromium.org, titzer@chromium.org
BUG=v8:5507

Review-Url: https://codereview.chromium.org/2421453002
Cr-Commit-Position: refs/heads/master@{#40280}

src/bootstrapper.cc

@@ -1056,7 +1056,6 @@ static void InstallError(Isolate* isolate, Handle<JSObject> global,
                                 Builtins::kErrorPrototypeToString, 0, true);
       isolate->native_context()->set_error_to_string(*to_string_fun);
     } else {
-      DCHECK(context_index != Context::ERROR_FUNCTION_INDEX);
       DCHECK(isolate->native_context()->error_to_string()->IsJSFunction());
 
       InstallFunction(prototype, isolate->error_to_string(),
@@ -1923,6 +1922,16 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
                      Context::MAKE_URI_ERROR_INDEX);
   }
 
+  {  // -- C o m p i l e E r r o r
+    Handle<JSObject> dummy = factory->NewJSObject(isolate->object_function());
+    InstallError(isolate, dummy, factory->CompileError_string(),
+                 Context::WASM_COMPILE_ERROR_FUNCTION_INDEX);
+
+    // -- R u n t i m e E r r o r
+    InstallError(isolate, dummy, factory->RuntimeError_string(),
+                 Context::WASM_RUNTIME_ERROR_FUNCTION_INDEX);
+  }
+
   // Initialize the embedder data slot.
   Handle<FixedArray> embedder_data = factory->NewFixedArray(3);
   native_context()->set_embedder_data(*embedder_data);

src/compiler/wasm-compiler.cc

@@ -3385,7 +3385,7 @@ Handle<Code> WasmCompilationUnit::FinishCompilation() {
           function_->name_offset, function_->name_length);
       SNPrintF(buffer, "Compiling WASM function #%d:%.*s failed:",
                function_->func_index, name.length(), name.start());
-      thrower_->Failed(buffer.start(), graph_construction_result_);
+      thrower_->CompileFailed(buffer.start(), graph_construction_result_);
     }
 
     return Handle<Code>::null();

src/contexts.h

@@ -108,7 +108,10 @@ enum ContextLookupFlags {
   V(SET_HAS_METHOD_INDEX, JSFunction, set_has)                            \
   V(SYNTAX_ERROR_FUNCTION_INDEX, JSFunction, syntax_error_function)       \
   V(TYPE_ERROR_FUNCTION_INDEX, JSFunction, type_error_function)           \
-  V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function)
+  V(URI_ERROR_FUNCTION_INDEX, JSFunction, uri_error_function)             \
+  V(WASM_COMPILE_ERROR_FUNCTION_INDEX, JSFunction,                        \
+    wasm_compile_error_function)                                          \
+  V(WASM_RUNTIME_ERROR_FUNCTION_INDEX, JSFunction, wasm_runtime_error_function)
 
 #define NATIVE_CONTEXT_FIELDS(V)                                               \
   V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object)                         \

src/factory.cc

@@ -1289,6 +1289,8 @@ DEFINE_ERROR(RangeError, range_error)
 DEFINE_ERROR(ReferenceError, reference_error)
 DEFINE_ERROR(SyntaxError, syntax_error)
 DEFINE_ERROR(TypeError, type_error)
+DEFINE_ERROR(WasmCompileError, wasm_compile_error)
+DEFINE_ERROR(WasmRuntimeError, wasm_runtime_error)
 #undef DEFINE_ERROR
 
 Handle<JSFunction> Factory::NewFunction(Handle<Map> map,

src/factory.h

@@ -634,6 +634,8 @@ class Factory final {
   DECLARE_ERROR(ReferenceError)
   DECLARE_ERROR(SyntaxError)
   DECLARE_ERROR(TypeError)
+  DECLARE_ERROR(WasmCompileError)
+  DECLARE_ERROR(WasmRuntimeError)
 #undef DEFINE_ERROR
 
   Handle<String> NumberToString(Handle<Object> number,

src/heap-symbols.h

@@ -156,6 +156,8 @@
   V(true_string, "true")                                           \
   V(TypeError_string, "TypeError")                                 \
   V(type_string, "type")                                           \
+  V(CompileError_string, "CompileError")                           \
+  V(RuntimeError_string, "RuntimeError")                           \
   V(uint16x8_string, "uint16x8")                                   \
   V(Uint16x8_string, "Uint16x8")                                   \
   V(uint32x4_string, "uint32x4")                                   \

src/runtime/runtime-internal.cc

@@ -122,7 +122,7 @@ RUNTIME_FUNCTION(Runtime_ThrowWasmError) {
   DCHECK_EQ(2, args.length());
   CONVERT_SMI_ARG_CHECKED(message_id, 0);
   CONVERT_SMI_ARG_CHECKED(byte_offset, 1);
-  Handle<Object> error_obj = isolate->factory()->NewError(
+  Handle<Object> error_obj = isolate->factory()->NewWasmRuntimeError(
       static_cast<MessageTemplate::Template>(message_id));
 
   // For wasm traps, the byte offset (a.k.a source position) can not be

src/wasm/wasm-js.cc

@@ -60,7 +60,7 @@ RawBuffer GetRawBufferSource(
     end = start + contents.ByteLength();
 
     if (start == nullptr || end == start) {
-      thrower->Error("ArrayBuffer argument is empty");
+      thrower->CompileError("ArrayBuffer argument is empty");
     }
   } else if (source->IsTypedArray()) {
     // A TypedArray was passed.
@@ -74,10 +74,10 @@ RawBuffer GetRawBufferSource(
     end = start + array->ByteLength();
 
     if (start == nullptr || end == start) {
-      thrower->Error("ArrayBuffer argument is empty");
+      thrower->TypeError("ArrayBuffer argument is empty");
     }
   } else {
-    thrower->Error("Argument 0 must be an ArrayBuffer or Uint8Array");
+    thrower->TypeError("Argument 0 must be an ArrayBuffer or Uint8Array");
   }
 
   return {start, end};
@@ -101,7 +101,7 @@ void VerifyModule(const v8::FunctionCallbackInfo<v8::Value>& args) {
                                        true, internal::wasm::kWasmOrigin);
 
   if (result.failed()) {
-    thrower.Failed("", result);
+    thrower.CompileFailed("", result);
   }
 
   if (result.val) delete result.val;
@@ -129,7 +129,7 @@ void VerifyFunction(const v8::FunctionCallbackInfo<v8::Value>& args) {
   }
 
   if (result.failed()) {
-    thrower.Failed("", result);
+    thrower.CompileFailed("", result);
   }
 
   if (result.val) delete result.val;
@@ -331,9 +331,10 @@ void WebAssemblyInstance(const v8::FunctionCallbackInfo<v8::Value>& args) {
   i::MaybeHandle<i::JSObject> instance =
       i::wasm::WasmModule::Instantiate(i_isolate, &thrower, i_obj, ffi, memory);
   if (instance.is_null()) {
-    if (!thrower.error()) thrower.Error("Could not instantiate module");
+    if (!thrower.error()) thrower.RuntimeError("Could not instantiate module");
     return;
   }
+  DCHECK(!i_isolate->has_pending_exception());
   v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
   return_value.Set(Utils::ToLocal(instance.ToHandleChecked()));
 }
@@ -748,6 +749,17 @@ void WasmJs::InstallWasmConstructors(Isolate* isolate,
                         memory_constructor, DONT_ENUM);
   InstallFunc(isolate, memory_proto, "grow", WebAssemblyMemoryGrow);
   InstallGetter(isolate, memory_proto, "buffer", WebAssemblyMemoryGetBuffer);
+
+  // Setup errors
+  attributes = static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY);
+  Handle<JSFunction> compile_error(
+      isolate->native_context()->wasm_compile_error_function());
+  JSObject::AddProperty(wasm_object, isolate->factory()->CompileError_string(),
+                        compile_error, attributes);
+  Handle<JSFunction> runtime_error(
+      isolate->native_context()->wasm_runtime_error_function());
+  JSObject::AddProperty(wasm_object, isolate->factory()->RuntimeError_string(),
+                        runtime_error, attributes);
 }
 
 void WasmJs::Install(Isolate* isolate, Handle<JSGlobalObject> global) {

src/wasm/wasm-module.cc

@@ -565,7 +565,7 @@ void CompileSequentially(Isolate* isolate, const WasmModule* module,
     code = compiler::WasmCompilationUnit::CompileWasmFunction(
         thrower, isolate, module_env, &func);
     if (code.is_null()) {
-      thrower->Error("Compilation of #%d:%.*s failed.", i, str.length(),
+      thrower->CompileError("Compilation of #%d:%.*s failed.", i, str.length(),
                             str.start());
       break;
     }
@@ -1268,7 +1268,7 @@ class WasmInstanceBuilder {
           NewArrayBuffer(isolate_, globals_size);
       globals = global_buffer;
       if (globals.is_null()) {
-        thrower_->Error("Out of memory: wasm globals");
+        thrower_->RangeError("Out of memory: wasm globals");
         return nothing;
       }
       Address old_address = owner.is_null()
@@ -1425,6 +1425,8 @@ class WasmInstanceBuilder {
       }
     }
 
+    DCHECK(wasm::IsWasmObject(*instance));
+
     //--------------------------------------------------------------------------
     // Run the start function if one was specified.
     //--------------------------------------------------------------------------
@@ -1448,7 +1450,8 @@ class WasmInstanceBuilder {
           Execution::Call(isolate_, startup_fct, undefined, 0, nullptr);
 
       if (retval.is_null()) {
-        thrower_->Error("WASM.instantiateModule(): start function failed");
+        DCHECK(isolate_->has_pending_exception());
+        isolate_->OptionalRescheduleException(false);
         // It's unfortunate that the new instance is already linked in the
         // chain. However, we need to set up everything before executing the
         // start function, such that stack trace information can be generated
@@ -1457,8 +1460,7 @@ class WasmInstanceBuilder {
       }
     }
 
-    DCHECK(wasm::IsWasmObject(*instance));
-
+    DCHECK(!isolate_->has_pending_exception());
     TRACE("Finishing instance %d\n", compiled_module_->instance_id());
     TRACE_CHAIN(WasmCompiledModule::cast(module_object_->GetInternalField(0)));
     return instance;
@@ -1478,17 +1480,17 @@ class WasmInstanceBuilder {
                                          MaybeHandle<String> function_name) {
     Handle<String> function_name_handle;
     if (function_name.ToHandle(&function_name_handle)) {
-      thrower_->Error("Import #%d module=\"%.*s\" function=\"%.*s\" error: %s",
-                      index, module_name->length(),
-                      module_name->ToCString().get(),
+      thrower_->TypeError(
+          "Import #%d module=\"%.*s\" function=\"%.*s\" error: %s", index,
+          module_name->length(), module_name->ToCString().get(),
           function_name_handle->length(),
           function_name_handle->ToCString().get(), error);
     } else {
-      thrower_->Error("Import #%d module=\"%.*s\" error: %s", index,
+      thrower_->TypeError("Import #%d module=\"%.*s\" error: %s", index,
                           module_name->length(), module_name->ToCString().get(),
                           error);
     }
-    thrower_->Error("Import ");
+    thrower_->TypeError("Import ");
     return MaybeHandle<JSFunction>();
   }
 
@@ -1773,14 +1775,14 @@ class WasmInstanceBuilder {
   // Allocate memory for a module instance as a new JSArrayBuffer.
   Handle<JSArrayBuffer> AllocateMemory(uint32_t min_mem_pages) {
     if (min_mem_pages > WasmModule::kMaxMemPages) {
-      thrower_->Error("Out of memory: wasm memory too large");
+      thrower_->RangeError("Out of memory: wasm memory too large");
       return Handle<JSArrayBuffer>::null();
     }
     Handle<JSArrayBuffer> mem_buffer =
         NewArrayBuffer(isolate_, min_mem_pages * WasmModule::kPageSize);
 
     if (mem_buffer.is_null()) {
-      thrower_->Error("Out of memory: wasm memory");
+      thrower_->RangeError("Out of memory: wasm memory");
     }
     return mem_buffer;
   }
@@ -1881,7 +1883,7 @@ class WasmInstanceBuilder {
       v8::Maybe<bool> status = JSReceiver::DefineOwnProperty(
           isolate_, exports_object, name, &desc, Object::THROW_ON_ERROR);
       if (!status.IsJust()) {
-        thrower_->Error("export of %.*s failed.", name->length(),
+        thrower_->TypeError("export of %.*s failed.", name->length(),
                             name->ToCString().get());
         return;
       }
@@ -2166,7 +2168,7 @@ MaybeHandle<JSObject> wasm::CreateModuleObjectFromBytes(
       DecodeWasmModule(isolate, &zone, start, end, false, origin);
   std::unique_ptr<const WasmModule> decoded_module(result.val);
   if (result.failed()) {
-    thrower->Failed("Wasm decoding failed", result);
+    thrower->CompileFailed("Wasm decoding failed", result);
     return nothing;
   }
   MaybeHandle<WasmCompiledModule> maybe_compiled_module =

src/wasm/wasm-result.cc

@@ -46,28 +46,35 @@ void ErrorThrower::Format(i::Handle<i::JSFunction> constructor,
   exception_ = isolate_->factory()->NewError(constructor, message);
 }
 
-void ErrorThrower::Error(const char* format, ...) {
+void ErrorThrower::TypeError(const char* format, ...) {
   if (error()) return;
   va_list arguments;
   va_start(arguments, format);
-  Format(isolate_->error_function(), format, arguments);
+  Format(isolate_->type_error_function(), format, arguments);
   va_end(arguments);
 }
 
-void ErrorThrower::TypeError(const char* format, ...) {
+void ErrorThrower::RangeError(const char* format, ...) {
   if (error()) return;
   va_list arguments;
   va_start(arguments, format);
-  Format(isolate_->type_error_function(), format, arguments);
+  Format(isolate_->range_error_function(), format, arguments);
   va_end(arguments);
 }
 
-void ErrorThrower::RangeError(const char* format, ...) {
+void ErrorThrower::CompileError(const char* format, ...) {
   if (error()) return;
   va_list arguments;
   va_start(arguments, format);
-  CHECK(*isolate_->range_error_function() != *isolate_->type_error_function());
-  Format(isolate_->range_error_function(), format, arguments);
+  Format(isolate_->wasm_compile_error_function(), format, arguments);
+  va_end(arguments);
+}
+
+void ErrorThrower::RuntimeError(const char* format, ...) {
+  if (error()) return;
+  va_list arguments;
+  va_start(arguments, format);
+  Format(isolate_->wasm_runtime_error_function(), format, arguments);
   va_end(arguments);
 }
 

src/wasm/wasm-result.h

@@ -91,15 +91,16 @@ class V8_EXPORT_PRIVATE ErrorThrower {
       : isolate_(isolate), context_(context) {}
   ~ErrorThrower();
 
-  PRINTF_FORMAT(2, 3) void Error(const char* fmt, ...);
   PRINTF_FORMAT(2, 3) void TypeError(const char* fmt, ...);
   PRINTF_FORMAT(2, 3) void RangeError(const char* fmt, ...);
+  PRINTF_FORMAT(2, 3) void CompileError(const char* fmt, ...);
+  PRINTF_FORMAT(2, 3) void RuntimeError(const char* fmt, ...);
 
   template <typename T>
-  void Failed(const char* error, Result<T>& result) {
+  void CompileFailed(const char* error, Result<T>& result) {
     std::ostringstream str;
     str << error << result;
-    Error("%s", str.str().c_str());
+    CompileError("%s", str.str().c_str());
   }
 
   i::Handle<i::Object> Reify() {

test/common/wasm/wasm-module-runner.cc

@@ -36,7 +36,7 @@ const WasmModule* DecodeWasmModuleForTesting(Isolate* isolate, Zone* zone,
   std::unique_ptr<const WasmModule> module(decoding_result.val);
   if (decoding_result.failed()) {
     // Module verification failed. throw.
-    thrower->Error("WASM.compileRun() failed: %s",
+    thrower->CompileError("WASM.compileRun() failed: %s",
                           decoding_result.error_msg.get());
     return nullptr;
   }
@@ -51,10 +51,10 @@ const Handle<JSObject> InstantiateModuleForTesting(Isolate* isolate,
   CHECK(module != nullptr);
 
   if (module->import_table.size() > 0) {
-    thrower->Error("Not supported: module has imports.");
+    thrower->CompileError("Not supported: module has imports.");
   }
   if (module->export_table.size() == 0) {
-    thrower->Error("Not supported: module has no exports.");
+    thrower->CompileError("Not supported: module has no exports.");
   }
   if (thrower->error()) return Handle<JSObject>::null();
 
@@ -64,7 +64,7 @@ const Handle<JSObject> InstantiateModuleForTesting(Isolate* isolate,
       isolate, module->module_start, module->module_end, thrower,
       ModuleOrigin::kWasmOrigin, Handle<Script>::null(), nullptr, nullptr);
   if (module_object.is_null()) {
-    thrower->Error("Module pre-validation failed.");
+    thrower->CompileError("Module pre-validation failed.");
     return Handle<JSObject>::null();
   }
   MaybeHandle<JSObject> maybe_instance = WasmModule::Instantiate(
@@ -84,7 +84,7 @@ const Handle<JSObject> CompileInstantiateWasmModuleForTesting(
       isolate, zone, thrower, module_start, module_end, origin));
 
   if (module == nullptr) {
-    thrower->Error("Wasm module decode failed");
+    thrower->CompileError("Wasm module decoding failed");
     return Handle<JSObject>::null();
   }
   return InstantiateModuleForTesting(isolate, thrower, module.get());
@@ -121,10 +121,10 @@ int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
   v8::internal::HandleScope scope(isolate);
 
   if (module->import_table.size() > 0) {
-    thrower->Error("Not supported: module has imports.");
+    thrower->CompileError("Not supported: module has imports.");
   }
   if (module->export_table.size() == 0) {
-    thrower->Error("Not supported: module has no exports.");
+    thrower->CompileError("Not supported: module has no exports.");
   }
 
   if (thrower->error()) return -1;
@@ -140,7 +140,7 @@ int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
         module->module_start + module->functions[i].code_end_offset};
     DecodeResult result = VerifyWasmCode(isolate->allocator(), body);
     if (result.failed()) {
-      thrower->Error("Function did not verify");
+      thrower->CompileError("Function did not verify");
       return -1;
     }
   }
@@ -171,7 +171,7 @@ int32_t InterpretWasmModule(Isolate* isolate, ErrorThrower* thrower,
   } else if (thread->state() == WasmInterpreter::TRAPPED) {
     return 0xdeadbeef;
   } else {
-    thrower->Error(
+    thrower->RangeError(
         "Interpreter did not finish execution within its step bound");
     return -1;
   }
@@ -204,7 +204,7 @@ int32_t CallWasmFunctionForTesting(Isolate* isolate, Handle<JSObject> instance,
 
   // The result should be a number.
   if (retval.is_null()) {
-    thrower->Error("WASM.compileRun() failed: Invocation was null");
+    thrower->RuntimeError("WASM.compileRun() failed: Invocation was null");
     return -1;
   }
   Handle<Object> result = retval.ToHandleChecked();
@@ -214,7 +214,8 @@ int32_t CallWasmFunctionForTesting(Isolate* isolate, Handle<JSObject> instance,
   if (result->IsHeapNumber()) {
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
-  thrower->Error("WASM.compileRun() failed: Return value should be number");
+  thrower->RuntimeError(
+      "WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 

test/mjsunit/wasm/errors.js

+// Copyright 2016 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.
+
+// Flags: --expose-wasm
+
+'use strict';
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+function module(bytes) {
+  let buffer = bytes;
+  if (typeof buffer === 'string') {
+    buffer = new ArrayBuffer(bytes.length);
+    let view = new Uint8Array(buffer);
+    for (let i = 0; i < bytes.length; ++i) {
+      view[i] = bytes.charCodeAt(i);
+    }
+  }
+  return new WebAssembly.Module(buffer);
+}
+
+function instance(bytes, imports = {}) {
+  return new WebAssembly.Instance(module(bytes), imports);
+}
+
+function builder() {
+  return new WasmModuleBuilder;
+}
+
+function assertCompileError(bytes) {
+  assertThrows(() => module(bytes), WebAssembly.CompileError);
+}
+
+function assertLinkError(bytes, imports = {}) {
+  assertThrows(() => instance(bytes, imports), TypeError);
+}
+
+function assertRuntimeError(bytes, imports = {}) {
+  assertThrows(() => instance(bytes, imports).exports.run(),
+    WebAssembly.RuntimeError);
+}
+
+function assertConversionError(bytes, imports = {}) {
+  assertThrows(() => instance(bytes, imports).exports.run(), TypeError);
+}
+
+(function TestDecodingError() {
+  assertCompileError("");
+  assertCompileError("X");
+  assertCompileError("\0x00asm");
+})();
+
+(function TestValidationError() {
+  assertCompileError(builder().addFunction("f", kSig_i_v).end().toBuffer());
+  assertCompileError(builder().addFunction("f", kSig_i_v).addBody([
+    kExprReturn
+  ]).end().toBuffer());
+  assertCompileError(builder().addFunction("f", kSig_v_v).addBody([
+    kExprGetLocal, 0
+  ]).end().toBuffer());
+  assertCompileError(builder().addStart(0).toBuffer());
+})();
+
+(function TestLinkingError() {
+  let b;
+
+  b = builder();
+  b.addImportWithModule("foo", "bar", kSig_v_v);
+  assertLinkError(b.toBuffer(), {});
+  b = builder();
+  b.addImportWithModule("foo", "bar", kSig_v_v);
+  assertLinkError(b.toBuffer(), {foo: {}});
+  b = builder();
+  b.addImportWithModule("foo", "bar", kSig_v_v);
+  assertLinkError(b.toBuffer(), {foo: {bar: 9}});
+
+  b = builder();
+  b.addImportedGlobal("foo", "bar", kAstI32);
+  assertLinkError(b.toBuffer(), {});
+  // TODO(titzer): implement stricter import checks for globals.
+  // b = builder();
+  // b.addImportedGlobal("foo", "bar", kAstI32);
+  // assertLinkError(b.toBuffer(), {foo: {}});
+  // b = builder();
+  // b.addImportedGlobal("foo", "bar", kAstI32);
+  // assertLinkError(b.toBuffer(), {foo: {bar: ""}});
+  // b = builder();
+  // b.addImportedGlobal("foo", "bar", kAstI32);
+  // assertLinkError(b.toBuffer(), {foo: {bar: () => 9}});
+
+  b = builder();
+  b.addImportedMemory("foo", "bar");
+  assertLinkError(b.toBuffer(), {});
+  b = builder();
+  b.addImportedMemory("foo", "bar");
+  assertLinkError(b.toBuffer(), {foo: {}});
+  // TODO(titzer): implement stricter import checks for globals.
+  // b = builder();
+  // b.addImportedMemory("foo", "bar", 1);
+  // assertLinkError(b.toBuffer(),
+  //     {foo: {bar: new WebAssembly.Memory({initial: 0})}});
+})();
+
+(function TestTrapError() {
+  assertRuntimeError(builder().addFunction("run", kSig_v_v).addBody([
+    kExprUnreachable
+  ]).exportFunc().end().toBuffer());
+
+  assertRuntimeError(builder().addFunction("run", kSig_v_v).addBody([
+    kExprI32Const, 1,
+    kExprI32Const, 0,
+    kExprI32DivS,
+    kExprDrop
+  ]).exportFunc().end().toBuffer());
+
+  assertRuntimeError(builder().addFunction("run", kSig_v_v).addBody([
+  ]).exportFunc().end().
+  addFunction("start", kSig_v_v).addBody([
+    kExprUnreachable
+  ]).end().addStart(1).toBuffer());
+})();
+
+(function TestConversionError() {
+  let b = builder();
+  b.addImportWithModule("foo", "bar", kSig_v_l);
+  assertConversionError(b.addFunction("run", kSig_v_v).addBody([
+    kExprI64Const, 0, kExprCallFunction, 0
+  ]).exportFunc().end().toBuffer());
+  assertConversionError(builder().addFunction("run", kSig_l_v).addBody([
+    kExprI64Const, 0
+  ]).exportFunc().end().toBuffer());
+})();

test/mjsunit/wasm/table.js

@@ -4,6 +4,8 @@
 
 // Flags: --expose-wasm
 
+'use strict';
+
 // Basic tests.
 
 var outOfUint32RangeValue = 1e12;

test/mjsunit/wasm/wasm-constants.js

@@ -99,11 +99,13 @@ var kSig_l_ll = makeSig([kAstI64, kAstI64], [kAstI64]);
 var kSig_i_dd = makeSig([kAstF64, kAstF64], [kAstI32]);
 var kSig_v_v = makeSig([], []);
 var kSig_i_v = makeSig([], [kAstI32]);
+var kSig_l_v = makeSig([], [kAstI64]);
 var kSig_f_v = makeSig([], [kAstF64]);
 var kSig_d_v = makeSig([], [kAstF64]);
 var kSig_v_i = makeSig([kAstI32], []);
 var kSig_v_ii = makeSig([kAstI32, kAstI32], []);
 var kSig_v_iii = makeSig([kAstI32, kAstI32, kAstI32], []);
+var kSig_v_l = makeSig([kAstI64], []);
 var kSig_v_d = makeSig([kAstF64], []);
 var kSig_v_dd = makeSig([kAstF64, kAstF64], []);
 var kSig_v_ddi = makeSig([kAstF64, kAstF64, kAstI32], []);

test/mjsunit/wasm/wasm-module-builder.js

@@ -83,6 +83,7 @@ class WasmFunctionBuilder {
     this.module = module;
     this.name = name;
     this.type_index = type_index;
+    this.body = [];
   }
 
   exportAs(name) {
@@ -104,6 +105,10 @@ class WasmFunctionBuilder {
     this.locals = locals;
     return this;
   }
+
+  end() {
+    return this.module;
+  }
 }
 
 class WasmGlobalBuilder {
@@ -138,6 +143,7 @@ class WasmModuleBuilder {
 
   addStart(start_index) {
     this.start_index = start_index;
+    return this;
   }
 
   addMemory(min, max, exp) {
@@ -197,6 +203,7 @@ class WasmModuleBuilder {
   addImportedMemory(module, name, initial = 0, maximum) {
     let o = {module: module, name: name, kind: kExternalMemory, initial: initial, maximum: maximum};
     this.imports.push(o);
+    return this;
   }
 
   addDataSegment(addr, data, is_global = false) {
@@ -213,7 +220,7 @@ class WasmModuleBuilder {
     return this;
   }
 
-  toArray(debug) {
+  toArray(debug = false) {
     let binary = new Binary;
     let wasm = this;
 
@@ -483,7 +490,7 @@ class WasmModuleBuilder {
     return binary;
   }
 
-  toBuffer(debug) {
+  toBuffer(debug = false) {
     let bytes = this.toArray(debug);
     let buffer = new ArrayBuffer(bytes.length);
     let view = new Uint8Array(buffer);