[wasm] Fix the --wasm_code_fuzzer_gen_test again.

R=titzer@chromium.org, clemensh@chromium.org

Review-Url: https://codereview.chromium.org/2657443003
Cr-Commit-Position: refs/heads/master@{#42658}

src/compiler/wasm-compiler.cc

@@ -3719,8 +3719,8 @@ SourcePositionTable* WasmCompilationUnit::BuildGraphForWasmFunction(
 
   if (index >= FLAG_trace_wasm_ast_start && index < FLAG_trace_wasm_ast_end) {
     OFStream os(stdout);
-    PrintWasmCode(isolate_->allocator(), body, module_env_->module_env.module,
-                  os, nullptr);
+    PrintRawWasmCode(isolate_->allocator(), body,
+                     module_env_->module_env.module);
   }
   if (index >= FLAG_trace_wasm_text_start && index < FLAG_trace_wasm_text_end) {
     OFStream os(stdout);

src/wasm/function-body-decoder.cc

@@ -470,7 +470,7 @@ class WasmFullDecoder : public WasmDecoder {
 
   bool Decode() {
     if (FLAG_wasm_code_fuzzer_gen_test) {
-      PrintWasmCodeForDebugging(start_, end_);
+      PrintRawWasmCode(start_, end_);
     }
     base::ElapsedTimer decode_timer;
     if (FLAG_trace_wasm_decode_time) {
@@ -1879,16 +1879,29 @@ unsigned OpcodeLength(const byte* pc, const byte* end) {
   return WasmDecoder::OpcodeLength(&decoder, pc);
 }
 
-void PrintWasmCodeForDebugging(const byte* start, const byte* end) {
+void PrintRawWasmCode(const byte* start, const byte* end) {
   AccountingAllocator allocator;
-  OFStream os(stdout);
-  PrintWasmCode(&allocator, FunctionBodyForTesting(start, end), nullptr, os,
-                nullptr);
+  PrintRawWasmCode(&allocator, FunctionBodyForTesting(start, end), nullptr);
 }
 
-bool PrintWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
-                   const wasm::WasmModule* module, std::ostream& os,
-                   std::vector<std::tuple<uint32_t, int, int>>* offset_table) {
+namespace {
+const char* RawOpcodeName(WasmOpcode opcode) {
+  switch (opcode) {
+#define DECLARE_NAME_CASE(name, opcode, sig) \
+  case kExpr##name:                          \
+    return "kExpr" #name;
+    FOREACH_OPCODE(DECLARE_NAME_CASE)
+#undef DECLARE_NAME_CASE
+    default:
+      break;
+  }
+  return "Unknown";
+}
+}  // namespace
+
+bool PrintRawWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
+                      const wasm::WasmModule* module) {
+  OFStream os(stdout);
   Zone zone(allocator, ZONE_NAME);
   WasmFullDecoder decoder(&zone, module, body);
   int line_nr = 0;
@@ -1937,16 +1950,13 @@ bool PrintWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
     if (opcode == kExprElse) control_depth--;
 
     int num_whitespaces = control_depth < 32 ? 2 * control_depth : 64;
-    if (offset_table) {
-      offset_table->push_back(
-          std::make_tuple(i.pc_offset(), line_nr, num_whitespaces));
-    }
 
     // 64 whitespaces
     const char* padding =
         "                                                                ";
     os.write(padding, num_whitespaces);
-    os << "k" << WasmOpcodes::OpcodeName(opcode) << ",";
+
+    os << RawOpcodeName(opcode) << ",";
 
     for (size_t j = 1; j < length; ++j) {
       os << " 0x" << AsHex(i.pc()[j], 2) << ",";

src/wasm/function-body-decoder.h

@@ -340,12 +340,11 @@ V8_EXPORT_PRIVATE DecodeResult VerifyWasmCode(AccountingAllocator* allocator,
                                               FunctionBody& body);
 DecodeResult BuildTFGraph(AccountingAllocator* allocator, TFBuilder* builder,
                           FunctionBody& body);
-bool PrintWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
-                   const wasm::WasmModule* module, std::ostream& os,
-                   std::vector<std::tuple<uint32_t, int, int>>* offset_table);
+bool PrintRawWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
+                      const wasm::WasmModule* module);
 
 // A simplified form of AST printing, e.g. from a debugger.
-void PrintWasmCodeForDebugging(const byte* start, const byte* end);
+void PrintRawWasmCode(const byte* start, const byte* end);
 
 inline DecodeResult VerifyWasmCode(AccountingAllocator* allocator,
                                    const WasmModule* module, FunctionSig* sig,

test/fuzzer/wasm-code.cc

@@ -26,22 +26,21 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (generate_test) {
     v8::internal::OFStream os(stdout);
 
-    os << "// Copyright 2016 the V8 project authors. All rights reserved."
+    os << "// Copyright 2017 the V8 project authors. All rights reserved."
        << std::endl;
     os << "// Use of this source code is governed by a BSD-style license that "
           "can be"
        << std::endl;
     os << "// found in the LICENSE file." << std::endl;
     os << std::endl;
-    os << "// Flags: --expose-wasm" << std::endl;
-    os << std::endl;
     os << "load(\"test/mjsunit/wasm/wasm-constants.js\");" << std::endl;
     os << "load(\"test/mjsunit/wasm/wasm-module-builder.js\");" << std::endl;
     os << std::endl;
     os << "(function() {" << std::endl;
     os << "  var builder = new WasmModuleBuilder();" << std::endl;
+    os << "  builder.addMemory(32, 32, false);" << std::endl;
     os << "  builder.addFunction(\"test\", kSig_i_iii)" << std::endl;
-    os << "    .addBody([" << std::endl;
+    os << "    .addBodyWithEnd([" << std::endl;
   }
   v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
   v8::Isolate* isolate = support->GetIsolate();

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

@@ -103,6 +103,11 @@ class WasmFunctionBuilder {
     return this;
   }
 
+  addBodyWithEnd(body) {
+    this.body = body;
+    return this;
+  }
+
   addLocals(locals) {
     this.locals = locals;
     return this;