[wasm] Master CL for Binary 0xC changes.

test/fuzzer/wasm-section-fuzzers.cc

 // 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.
 
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 #include "include/v8.h"
 #include "src/isolate.h"
 #include "src/wasm/encoder.h"
 #include "src/wasm/wasm-module.h"
 #include "src/zone/accounting-allocator.h"
 #include "src/zone/zone.h"
 #include "test/common/wasm/wasm-module-runner.h"
 #include "test/fuzzer/fuzzer-support.h"
 
 using namespace v8::internal::wasm;
 
-int fuzz_wasm_section(WasmSection::Code section, const uint8_t* data,
+static const char* kNameString = "name";
+static const size_t kNameStringLength = 4;
+
+int fuzz_wasm_section(WasmSectionCode section, const uint8_t* data,
                       size_t size) {
   v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
   v8::Isolate* isolate = support->GetIsolate();
   v8::internal::Isolate* i_isolate =
       reinterpret_cast<v8::internal::Isolate*>(isolate);
 
   // Clear any pending exceptions from a prior run.
   if (i_isolate->has_pending_exception()) {
     i_isolate->clear_pending_exception();
   }
 
   v8::Isolate::Scope isolate_scope(isolate);
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(support->GetContext());
   v8::TryCatch try_catch(isolate);
 
   v8::internal::AccountingAllocator allocator;
   v8::internal::Zone zone(&allocator);
 
   ZoneBuffer buffer(&zone);
   buffer.write_u32(kWasmMagic);
   buffer.write_u32(kWasmVersion);
-  const char* name = WasmSection::getName(section);
-  size_t length = WasmSection::getNameLength(section);
-  buffer.write_size(length);  // Section name string size.
-  buffer.write(reinterpret_cast<const uint8_t*>(name), length);
-  buffer.write_u32v(static_cast<uint32_t>(size));
-  buffer.write(data, size);
+  if (section == kNameSectionCode) {
+    buffer.write_u8(kUnknownSectionCode);
+    buffer.write_size(size + kNameStringLength + 1);
+    buffer.write_u8(kNameStringLength);
+    buffer.write(reinterpret_cast<const uint8_t*>(kNameString),
+                 kNameStringLength);
+    buffer.write(data, size);
+  } else {
+    buffer.write_u8(section);
+    buffer.write_size(size);
+    buffer.write(data, size);
+  }
 
   ErrorThrower thrower(i_isolate, "decoder");
 
   std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting(
       i_isolate, &zone, &thrower, buffer.begin(), buffer.end(), kWasmOrigin));
 
   return 0;
 }