[wasm][asm.js] Cancel exception and rethrow on parse failure.

src/asmjs/asm-wasm-builder.cc

 // Copyright 2015 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/v8.h"
 
 // Required to get M_E etc. in MSVC.
 #if defined(_WIN32)
 #define _USE_MATH_DEFINES
 #endif
@@ skipping 145 matching lines @@
       info.set_language_mode(decl->fun()->scope()->language_mode());
       info.set_allow_lazy_parsing(false);
       info.set_function_literal_id(shared->function_literal_id());
       info.set_ast_value_factory(ast_value_factory_);
       info.set_ast_value_factory_owned(false);
       // Create fresh function scope to use to parse the function in.
       new_func_scope = new (info.zone()) DeclarationScope(
           info.zone(), decl->fun()->scope()->outer_scope(), FUNCTION_SCOPE);
       info.set_asm_function_scope(new_func_scope);
       if (!Compiler::ParseAndAnalyze(&info)) {
+        decl->fun()->scope()->outer_scope()->RemoveInnerScope(new_func_scope);
+        if (isolate_->has_pending_exception()) {
+          isolate_->clear_pending_exception();
+        }
+        typer_->TriggerParsingError();
         typer_failed_ = true;
         return;
       }
       FunctionLiteral* func = info.literal();
       DCHECK_NOT_NULL(func);
       decl->set_fun(func);
     }
     if (!typer_->ValidateInnerFunction(decl)) {
       typer_failed_ = true;
       decl->set_fun(old_func);
@@ skipping 1825 matching lines @@
   impl.builder_->WriteAsmJsOffsetTable(*asm_offsets_buffer);
   return {module_buffer, asm_offsets_buffer, success};
 }
 
 const char* AsmWasmBuilder::foreign_init_name = "__foreign_init__";
 const char* AsmWasmBuilder::single_function_name = "__single_function__";
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8