[wasm] Bound the allowed number of locals.

test/unittests/wasm/ast-decoder-unittest.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 "test/unittests/test-utils.h"
 
 #include "src/v8.h"
 
 #include "test/cctest/wasm/test-signatures.h"
 
@@ skipping 220 matching lines @@
 
 TEST_F(AstDecoderTest, GetLocal0_param) {
   EXPECT_VERIFIES(sigs.i_i(), kCodeGetLocal0);
 }
 
 TEST_F(AstDecoderTest, GetLocal0_local) {
   AddLocals(kAstI32, 1);
   EXPECT_VERIFIES(sigs.i_v(), kCodeGetLocal0);
 }
 
+TEST_F(AstDecoderTest, TooManyLocals) {
+  AddLocals(kAstI32, 4034986500);
+  EXPECT_FAILURE(sigs.i_v(), kCodeGetLocal0);
+}
+
 TEST_F(AstDecoderTest, GetLocal0_param_n) {
   FunctionSig* array[] = {sigs.i_i(), sigs.i_ii(), sigs.i_iii()};
 
   for (size_t i = 0; i < arraysize(array); i++) {
     EXPECT_VERIFIES(array[i], kCodeGetLocal0);
   }
 }
 
 TEST_F(AstDecoderTest, GetLocalN_local) {
   for (byte i = 1; i < 8; i++) {
@@ skipping 2310 matching lines @@
   iter.next();
   EXPECT_TRUE(iter.has_next());
   EXPECT_EQ(kExprI8Const, iter.current());
   iter.next();
   EXPECT_FALSE(iter.has_next());
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8