[wasm] Create a new fuzzer for wasm code.

test/fuzzer/wasm-code.cc

Index: test/fuzzer/wasm-code.cc
diff --git a/test/fuzzer/wasm-asmjs.cc b/test/fuzzer/wasm-code.cc
similarity index 61%
copy from test/fuzzer/wasm-asmjs.cc
copy to test/fuzzer/wasm-code.cc
index cb8b86bad4f037b425e7f74d1f0505dcd7ce66e8..ae1ec4a0deb7e92cf943d793ea95573a161dbae6 100644
--- a/test/fuzzer/wasm-asmjs.cc
+++ b/test/fuzzer/wasm-code.cc
@@ -2,18 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
-#include "src/factory.h"
-#include "src/isolate-inl.h"
 #include "src/isolate.h"
-#include "src/objects-inl.h"
-#include "src/objects.h"
+#include "src/wasm/encoder.h"
 #include "src/wasm/wasm-js.h"
 #include "src/wasm/wasm-module.h"
+#include "test/cctest/wasm/test-signatures.h"
 #include "test/fuzzer/fuzzer-support.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
@@ -31,9 +28,27 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(support->GetContext());
   v8::TryCatch try_catch(isolate);
+
+  v8::base::AccountingAllocator allocator;
+  v8::internal::Zone zone(&allocator);
+
+  v8::internal::wasm::TestSignatures sigs;
+
+  v8::internal::wasm::WasmModuleBuilder builder(&zone);
+
+  uint16_t f1_index = builder.AddFunction();
+  v8::internal::wasm::WasmFunctionBuilder* f = builder.FunctionAt(f1_index);
+  f->SetSignature(sigs.i_iii());
+  f->EmitCode(data, static_cast<uint32_t>(size));
+  f->SetExported();
+  f->SetName("main", 4);
+
+  v8::internal::wasm::ZoneBuffer buffer(&zone);
+  builder.WriteTo(buffer);
+
   v8::internal::WasmJs::InstallWasmFunctionMap(i_isolate,
                                                i_isolate->native_context());
-  v8::internal::wasm::testing::CompileAndRunWasmModule(i_isolate, data,
-                                                       data + size, true);
+  v8::internal::wasm::testing::CompileAndRunWasmModule(
+      i_isolate, buffer.begin(), buffer.end(), false);
   return 0;
 }