deps: update V8 to 5.8.283.38

PR-URL: https://github.com/nodejs/node/pull/12784
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

20 files changed, 616 insertions, 13 deletions

diff --git a/deps/v8/test/fuzzer/README.md b/deps/v8/test/fuzzer/README.md
new file mode 100644
index 0000000000..ed0ce1fa2a
--- /dev/null
+++ b/deps/v8/test/fuzzer/README.md
@@ -0,0 +1,91 @@
+# How to make a libFuzzer fuzzer in V8
+
+This document describes how to make a new libFuzzer fuzzer for V8. A general
+introduction to libFuzzer can be found
+[here](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/README.md).
+In short, libFuzzer is an in-process coverage-driven evolutionary fuzzer.
+libFuzzer serves you with a sequence of byte arrays that you can use to test
+your code. libFuzzer tries to generate this sequence of byte arrays in a way
+that maximizes test coverage.
+
+**Warning**: By itself libFuzzer typically does not generate valid JavaScript code.
+
+## Changes to V8
+
+**tldr:** Do the same as https://codereview.chromium.org/2280623002 to introduce
+a new fuzzer to V8.
+
+This is a step by step guide on how to make a new fuzzer in V8. In the example
+the fuzzer is called `foo`.
+
+1. Copy one of the existing fuzzer implementations in
+   [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/), e.g. `cp wasm.cc foo.cc`
+
+   * Copying an existing fuzzer is a good idea to get all the required setup,
+     e.g. setting up the isolate
+
+2. Create a directory called `foo` in
+   [test/fuzzer/](https://cs.chromium.org/chromium/src/v8/test/fuzzer/) which
+   contains at least one file
+
+   * The file is used by the trybots to check whether the fuzzer actually
+     compiles and runs
+
+3. Copy the build rules of an existing fuzzer in
+   [BUILD.gn](https://cs.chromium.org/chromium/src/v8/BUILD.gn), e.g. the build
+   rules for the
+   [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
+   are `v8_source_set("wasm_fuzzer")` and `v8_fuzzer("wasm_fuzzer")`. Note that
+   the name has to be the name of the directory created in Step 2 + `_fuzzer` so
+   that the scripts on the trybots work
+
+4. Now you can already compile the fuzzer, e.g.  with `ninja -j 1000 -C
+   out/x64.debug/v8_simple_foo_fuzzer`
+
+   * Use this binary to reproduce issues found by cluster fuzz, e.g.
+     `out/x64.debug/v8_simple_foo_fuzzer testcase.foo`
+
+5. Copy the build rules of an existing fuzzer in
+   [test/fuzzer/fuzzer.gyp](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.gyp),
+   e.g. the build rules for the
+   [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
+   are `v8_simple_wasm_fuzzer` and `wasm_fuzzer_lib`
+
+   * This build rule is needed to compile with gyp
+
+6. Copy the binary name and the test directory name in
+   [test/fuzzer/fuzzer.isolate](https://cs.chromium.org/chromium/src/v8/test/fuzzer/fuzzer.isolate)
+
+7. Add the fuzzer to the FuzzerTestSuite in
+   [test/fuzzer/testcfg.py](https://cs.chromium.org/chromium/src/v8/test/fuzzer/testcfg.py)
+
+   * This step is needed to run the fuzzer with the files created in Step 2 on
+     the trybots
+
+8. Commit the changes described above to the V8 repository
+
+## Changes to Chromium
+
+**tldr:** Do the same as https://codereview.chromium.org/2344823002 to add the
+new fuzzer to cluster fuzz.
+
+1. Copy the build rules of an existing fuzzer in
+   [testing/libfuzzer/fuzzers/BUILD.gn](https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/BUILD.gn),
+   e.g. the build rule for the
+   [wasm.cc](https://cs.chromium.org/chromium/src/v8/test/fuzzer/wasm.cc) fuzzer
+   is `v8_wasm_fuzzer`. There is no need to set a `dictionary` , or a `seed_corpus`.
+   See
+   [chromium-fuzzing-getting-started](https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md)
+   for more information.
+
+2. Compile the fuzzer in chromium (for different configurations see:
+   https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md):
+
+   * `gn gen out/libfuzzer '--args=use_libfuzzer=true is_asan=true is_debug=false enable_nacl=false'`
+
+   * `ninja -j 1000 -C out/libfuzzer/ v8_foo_fuzzer`
+
+3. Run the fuzzer locally
+
+   * `mkdir /tmp/empty_corpus && out/libfuzzer/v8_foo_fuzzer /tmp/empty_corpus`
+
diff --git a/deps/v8/test/fuzzer/fuzzer.gyp b/deps/v8/test/fuzzer/fuzzer.gyp
index 6b40aaaf54..3b93808533 100644
--- a/deps/v8/test/fuzzer/fuzzer.gyp
+++ b/deps/v8/test/fuzzer/fuzzer.gyp
@@ -201,6 +201,35 @@
       ],
     },
     {
+      'target_name': 'v8_simple_wasm_compile_fuzzer',
+      'type': 'executable',
+      'dependencies': [
+        'wasm_compile_fuzzer_lib',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [
+        'fuzzer.cc',
+      ],
+    },
+    {
+      'target_name': 'wasm_compile_fuzzer_lib',
+      'type': 'static_library',
+      'dependencies': [
+        'fuzzer_support',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [  ### gcmole(all) ###
+        'wasm-compile.cc',
+        '../common/wasm/test-signatures.h',
+        '../common/wasm/wasm-module-runner.cc',
+        '../common/wasm/wasm-module-runner.h',
+      ],
+    },
+    {
       'target_name': 'v8_simple_wasm_data_section_fuzzer',
       'type': 'executable',
       'dependencies': [
diff --git a/deps/v8/test/fuzzer/fuzzer.isolate b/deps/v8/test/fuzzer/fuzzer.isolate
index 788c76c010..5a4654c155 100644
--- a/deps/v8/test/fuzzer/fuzzer.isolate
+++ b/deps/v8/test/fuzzer/fuzzer.isolate
@@ -12,6 +12,7 @@
       '<(PRODUCT_DIR)/v8_simple_wasm_asmjs_fuzzer<(EXECUTABLE_SUFFIX)',
       '<(PRODUCT_DIR)/v8_simple_wasm_call_fuzzer<(EXECUTABLE_SUFFIX)',
       '<(PRODUCT_DIR)/v8_simple_wasm_code_fuzzer<(EXECUTABLE_SUFFIX)',
+      '<(PRODUCT_DIR)/v8_simple_wasm_compile_fuzzer<(EXECUTABLE_SUFFIX)',
       '<(PRODUCT_DIR)/v8_simple_wasm_data_section_fuzzer<(EXECUTABLE_SUFFIX)',
       '<(PRODUCT_DIR)/v8_simple_wasm_function_sigs_section_fuzzer<(EXECUTABLE_SUFFIX)',
       '<(PRODUCT_DIR)/v8_simple_wasm_globals_section_fuzzer<(EXECUTABLE_SUFFIX)',
@@ -28,6 +29,7 @@
       './wasm_asmjs/',
       './wasm_call/',
       './wasm_code/',
+      './wasm_compile/',
       './wasm_data_section/',
       './wasm_function_sigs_section/',
       './wasm_globals_section/',
diff --git a/deps/v8/test/fuzzer/parser.cc b/deps/v8/test/fuzzer/parser.cc
index 4ce4acb8bd..2b31bf5aab 100644
--- a/deps/v8/test/fuzzer/parser.cc
+++ b/deps/v8/test/fuzzer/parser.cc
@@ -35,8 +35,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
   v8::internal::Handle<v8::internal::Script> script =
       factory->NewScript(source.ToHandleChecked());
-  v8::internal::Zone zone(i_isolate->allocator(), ZONE_NAME);
-  v8::internal::ParseInfo info(&zone, script);
+  v8::internal::ParseInfo info(script);
   v8::internal::parsing::ParseProgram(&info);
   isolate->RequestGarbageCollectionForTesting(
       v8::Isolate::kFullGarbageCollection);
diff --git a/deps/v8/test/fuzzer/testcfg.py b/deps/v8/test/fuzzer/testcfg.py
index 0e4925bc06..0e07fb574e 100644
--- a/deps/v8/test/fuzzer/testcfg.py
+++ b/deps/v8/test/fuzzer/testcfg.py
@@ -19,9 +19,10 @@ class FuzzerVariantGenerator(testsuite.VariantGenerator):
 
 class FuzzerTestSuite(testsuite.TestSuite):
   SUB_TESTS = ( 'json', 'parser', 'regexp', 'wasm', 'wasm_asmjs', 'wasm_call',
-          'wasm_code', 'wasm_data_section', 'wasm_function_sigs_section',
-          'wasm_globals_section', 'wasm_imports_section', 'wasm_memory_section',
-          'wasm_names_section', 'wasm_types_section' )
+          'wasm_code', 'wasm_compile', 'wasm_data_section',
+          'wasm_function_sigs_section', 'wasm_globals_section',
+          'wasm_imports_section', 'wasm_memory_section', 'wasm_names_section',
+          'wasm_types_section' )
 
   def __init__(self, name, root):
     super(FuzzerTestSuite, self).__init__(name, root)
diff --git a/deps/v8/test/fuzzer/wasm-asmjs.cc b/deps/v8/test/fuzzer/wasm-asmjs.cc
index d3341fa5b3..2f35ded7e3 100644
--- a/deps/v8/test/fuzzer/wasm-asmjs.cc
+++ b/deps/v8/test/fuzzer/wasm-asmjs.cc
@@ -17,6 +17,10 @@
 #include "test/fuzzer/fuzzer-support.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  unsigned int max_mem_flag_value = v8::internal::FLAG_wasm_max_mem_pages;
+  unsigned int max_table_flag_value = v8::internal::FLAG_wasm_max_table_size;
+  v8::internal::FLAG_wasm_max_mem_pages = 32;
+  v8::internal::FLAG_wasm_max_table_size = 100;
   v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
   v8::Isolate* isolate = support->GetIsolate();
   v8::internal::Isolate* i_isolate =
@@ -35,5 +39,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   v8::internal::wasm::testing::CompileAndRunWasmModule(
       i_isolate, data, data + size,
       v8::internal::wasm::ModuleOrigin::kAsmJsOrigin);
+  v8::internal::FLAG_wasm_max_mem_pages = max_mem_flag_value;
+  v8::internal::FLAG_wasm_max_table_size = max_table_flag_value;
   return 0;
 }
diff --git a/deps/v8/test/fuzzer/wasm-call.cc b/deps/v8/test/fuzzer/wasm-call.cc
index e18575c5d6..3291d9eab1 100644
--- a/deps/v8/test/fuzzer/wasm-call.cc
+++ b/deps/v8/test/fuzzer/wasm-call.cc
@@ -7,6 +7,7 @@
 
 #include "include/v8.h"
 #include "src/isolate.h"
+#include "src/objects-inl.h"
 #include "src/objects.h"
 #include "src/utils.h"
 #include "src/wasm/wasm-interpreter.h"
@@ -168,15 +169,19 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
         i_isolate, instance, &compiler_thrower, "main", argc, compiled_args,
         v8::internal::wasm::ModuleOrigin::kWasmOrigin);
   }
+
+  // The WebAssembly spec allows the sign bit of NaN to be non-deterministic.
+  // This sign bit may cause result_interpreted to be different than
+  // result_compiled. Therefore we do not check the equality of the results
+  // if the execution may have produced a NaN at some point.
+  if (possible_nondeterminism) return 0;
+
   if (result_interpreted == bit_cast<int32_t>(0xdeadbeef)) {
     CHECK(i_isolate->has_pending_exception());
     i_isolate->clear_pending_exception();
   } else {
-    // The WebAssembly spec allows the sign bit of NaN to be non-deterministic.
-    // This sign bit may cause result_interpreted to be different than
-    // result_compiled. Therefore we do not check the equality of the results
-    // if the execution may have produced a NaN at some point.
-    if (!possible_nondeterminism && (result_interpreted != result_compiled)) {
+    CHECK(!i_isolate->has_pending_exception());
+    if (result_interpreted != result_compiled) {
       V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x",
                v8::internal::StringHasher::HashSequentialString(
                    data, static_cast<int>(size), WASM_CODE_FUZZER_HASH_SEED));
diff --git a/deps/v8/test/fuzzer/wasm-code.cc b/deps/v8/test/fuzzer/wasm-code.cc
index 167680faf2..a80cfcfaca 100644
--- a/deps/v8/test/fuzzer/wasm-code.cc
+++ b/deps/v8/test/fuzzer/wasm-code.cc
@@ -7,6 +7,7 @@
 
 #include "include/v8.h"
 #include "src/isolate.h"
+#include "src/objects-inl.h"
 #include "src/objects.h"
 #include "src/ostreams.h"
 #include "src/wasm/wasm-interpreter.h"
@@ -38,7 +39,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
     os << std::endl;
     os << "(function() {" << std::endl;
     os << "  var builder = new WasmModuleBuilder();" << std::endl;
-    os << "  builder.addMemory(32, 32, false);" << std::endl;
+    os << "  builder.addMemory(16, 32, false);" << std::endl;
     os << "  builder.addFunction(\"test\", kSig_i_iii)" << std::endl;
     os << "    .addBodyWithEnd([" << std::endl;
   }
@@ -136,15 +137,23 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
         i_isolate, instance, &compiler_thrower, "main", arraysize(arguments),
         arguments, v8::internal::wasm::ModuleOrigin::kWasmOrigin);
   }
+
+  // The WebAssembly spec allows the sign bit of NaN to be non-deterministic.
+  // This sign bit may cause result_interpreted to be different than
+  // result_compiled. Therefore we do not check the equality of the results
+  // if the execution may have produced a NaN at some point.
+  if (possible_nondeterminism) return 0;
+
   if (result_interpreted == bit_cast<int32_t>(0xdeadbeef)) {
     CHECK(i_isolate->has_pending_exception());
     i_isolate->clear_pending_exception();
   } else {
+    CHECK(!i_isolate->has_pending_exception());
     // The WebAssembly spec allows the sign bit of NaN to be non-deterministic.
     // This sign bit may cause result_interpreted to be different than
     // result_compiled. Therefore we do not check the equality of the results
     // if the execution may have produced a NaN at some point.
-    if (!possible_nondeterminism && (result_interpreted != result_compiled)) {
+    if (result_interpreted != result_compiled) {
       V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x",
                v8::internal::StringHasher::HashSequentialString(
                    data, static_cast<int>(size), WASM_CODE_FUZZER_HASH_SEED));
diff --git a/deps/v8/test/fuzzer/wasm-compile.cc b/deps/v8/test/fuzzer/wasm-compile.cc
new file mode 100644
index 0000000000..0b01ce2357
--- /dev/null
+++ b/deps/v8/test/fuzzer/wasm-compile.cc
@@ -0,0 +1,447 @@
+// Copyright 2017 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 <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <algorithm>
+
+#include "include/v8.h"
+#include "src/isolate.h"
+#include "src/objects-inl.h"
+#include "src/objects.h"
+#include "src/ostreams.h"
+#include "src/wasm/wasm-interpreter.h"
+#include "src/wasm/wasm-module-builder.h"
+#include "src/wasm/wasm-module.h"
+#include "test/common/wasm/test-signatures.h"
+#include "test/common/wasm/wasm-module-runner.h"
+#include "test/fuzzer/fuzzer-support.h"
+
+#define WASM_CODE_FUZZER_HASH_SEED 83
+
+typedef uint8_t byte;
+
+using namespace v8::internal::wasm;
+
+namespace {
+
+class DataRange {
+  const uint8_t* data_;
+  size_t size_;
+
+ public:
+  DataRange(const uint8_t* data, size_t size) : data_(data), size_(size) {}
+
+  size_t size() const { return size_; }
+
+  std::pair<DataRange, DataRange> split(uint32_t index) const {
+    return std::make_pair(DataRange(data_, index),
+                          DataRange(data_ + index, size() - index));
+  }
+
+  std::pair<DataRange, DataRange> split() {
+    uint16_t index = get<uint16_t>();
+    if (size() > 0) {
+      index = index % size();
+    } else {
+      index = 0;
+    }
+    return split(index);
+  }
+
+  template <typename T>
+  T get() {
+    if (size() == 0) {
+      return T();
+    } else {
+      // We want to support the case where we have less than sizeof(T) bytes
+      // remaining in the slice. For example, if we emit an i32 constant, it's
+      // okay if we don't have a full four bytes available, we'll just use what
+      // we have. We aren't concerned about endianness because we are generating
+      // arbitrary expressions.
+      const size_t num_bytes = std::min(sizeof(T), size());
+      T result = T();
+      memcpy(&result, data_, num_bytes);
+      data_ += num_bytes;
+      size_ -= num_bytes;
+      return result;
+    }
+  }
+};
+
+class WasmGenerator {
+  template <WasmOpcode Op, ValueType... Args>
+  std::function<void(DataRange)> op() {
+    return [this](DataRange data) {
+      Generate<Args...>(data);
+      builder_->Emit(Op);
+    };
+  }
+
+  template <ValueType T>
+  std::function<void(DataRange)> block() {
+    return [this](DataRange data) {
+      blocks_.push_back(T);
+      builder_->EmitWithU8(
+          kExprBlock, static_cast<uint8_t>(WasmOpcodes::ValueTypeCodeFor(T)));
+      Generate<T>(data);
+      builder_->Emit(kExprEnd);
+      blocks_.pop_back();
+    };
+  }
+
+  template <ValueType T>
+  std::function<void(DataRange)> block_br() {
+    return [this](DataRange data) {
+      blocks_.push_back(T);
+      builder_->EmitWithU8(
+          kExprBlock, static_cast<uint8_t>(WasmOpcodes::ValueTypeCodeFor(T)));
+
+      const uint32_t target_block = data.get<uint32_t>() % blocks_.size();
+      const ValueType break_type = blocks_[target_block];
+
+      Generate(break_type, data);
+      builder_->EmitWithVarInt(kExprBr, target_block);
+      builder_->Emit(kExprEnd);
+      blocks_.pop_back();
+    };
+  }
+
+ public:
+  WasmGenerator(v8::internal::wasm::WasmFunctionBuilder* fn) : builder_(fn) {}
+
+  void Generate(ValueType type, DataRange data);
+
+  template <ValueType T>
+  void Generate(DataRange data);
+
+  template <ValueType T1, ValueType T2, ValueType... Ts>
+  void Generate(DataRange data) {
+    const auto parts = data.split();
+    Generate<T1>(parts.first);
+    Generate<T2, Ts...>(parts.second);
+  }
+
+ private:
+  v8::internal::wasm::WasmFunctionBuilder* builder_;
+  std::vector<ValueType> blocks_;
+};
+
+template <>
+void WasmGenerator::Generate<kWasmI32>(DataRange data) {
+  if (data.size() <= sizeof(uint32_t)) {
+    builder_->EmitI32Const(data.get<uint32_t>());
+  } else {
+    const std::function<void(DataRange)> alternates[] = {
+        op<kExprI32Eqz, kWasmI32>(),  //
+        op<kExprI32Eq, kWasmI32, kWasmI32>(),
+        op<kExprI32Ne, kWasmI32, kWasmI32>(),
+        op<kExprI32LtS, kWasmI32, kWasmI32>(),
+        op<kExprI32LtU, kWasmI32, kWasmI32>(),
+        op<kExprI32GeS, kWasmI32, kWasmI32>(),
+        op<kExprI32GeU, kWasmI32, kWasmI32>(),
+
+        op<kExprI64Eqz, kWasmI64>(),  //
+        op<kExprI64Eq, kWasmI64, kWasmI64>(),
+        op<kExprI64Ne, kWasmI64, kWasmI64>(),
+        op<kExprI64LtS, kWasmI64, kWasmI64>(),
+        op<kExprI64LtU, kWasmI64, kWasmI64>(),
+        op<kExprI64GeS, kWasmI64, kWasmI64>(),
+        op<kExprI64GeU, kWasmI64, kWasmI64>(),
+
+        op<kExprF32Eq, kWasmF32, kWasmF32>(),
+        op<kExprF32Ne, kWasmF32, kWasmF32>(),
+        op<kExprF32Lt, kWasmF32, kWasmF32>(),
+        op<kExprF32Ge, kWasmF32, kWasmF32>(),
+
+        op<kExprF64Eq, kWasmF64, kWasmF64>(),
+        op<kExprF64Ne, kWasmF64, kWasmF64>(),
+        op<kExprF64Lt, kWasmF64, kWasmF64>(),
+        op<kExprF64Ge, kWasmF64, kWasmF64>(),
+
+        op<kExprI32Add, kWasmI32, kWasmI32>(),
+        op<kExprI32Sub, kWasmI32, kWasmI32>(),
+        op<kExprI32Mul, kWasmI32, kWasmI32>(),
+
+        op<kExprI32DivS, kWasmI32, kWasmI32>(),
+        op<kExprI32DivU, kWasmI32, kWasmI32>(),
+        op<kExprI32RemS, kWasmI32, kWasmI32>(),
+        op<kExprI32RemU, kWasmI32, kWasmI32>(),
+
+        op<kExprI32And, kWasmI32, kWasmI32>(),
+        op<kExprI32Ior, kWasmI32, kWasmI32>(),
+        op<kExprI32Xor, kWasmI32, kWasmI32>(),
+        op<kExprI32Shl, kWasmI32, kWasmI32>(),
+        op<kExprI32ShrU, kWasmI32, kWasmI32>(),
+        op<kExprI32ShrS, kWasmI32, kWasmI32>(),
+        op<kExprI32Ror, kWasmI32, kWasmI32>(),
+        op<kExprI32Rol, kWasmI32, kWasmI32>(),
+
+        op<kExprI32Clz, kWasmI32>(),  //
+        op<kExprI32Ctz, kWasmI32>(),  //
+        op<kExprI32Popcnt, kWasmI32>(),
+
+        op<kExprI32ConvertI64, kWasmI64>(),  //
+        op<kExprI32SConvertF32, kWasmF32>(),
+        op<kExprI32UConvertF32, kWasmF32>(),
+        op<kExprI32SConvertF64, kWasmF64>(),
+        op<kExprI32UConvertF64, kWasmF64>(),
+        op<kExprI32ReinterpretF32, kWasmF32>(),
+
+        block<kWasmI32>(),
+        block_br<kWasmI32>()};
+
+    static_assert(arraysize(alternates) < std::numeric_limits<uint8_t>::max(),
+                  "Too many alternates. Replace with a bigger type if needed.");
+    const auto which = data.get<uint8_t>();
+
+    alternates[which % arraysize(alternates)](data);
+  }
+}
+
+template <>
+void WasmGenerator::Generate<kWasmI64>(DataRange data) {
+  if (data.size() <= sizeof(uint64_t)) {
+    const uint8_t bytes[] = {WASM_I64V(data.get<uint64_t>())};
+    builder_->EmitCode(bytes, arraysize(bytes));
+  } else {
+    const std::function<void(DataRange)> alternates[] = {
+        op<kExprI64Add, kWasmI64, kWasmI64>(),
+        op<kExprI64Sub, kWasmI64, kWasmI64>(),
+        op<kExprI64Mul, kWasmI64, kWasmI64>(),
+
+        op<kExprI64DivS, kWasmI64, kWasmI64>(),
+        op<kExprI64DivU, kWasmI64, kWasmI64>(),
+        op<kExprI64RemS, kWasmI64, kWasmI64>(),
+        op<kExprI64RemU, kWasmI64, kWasmI64>(),
+
+        op<kExprI64And, kWasmI64, kWasmI64>(),
+        op<kExprI64Ior, kWasmI64, kWasmI64>(),
+        op<kExprI64Xor, kWasmI64, kWasmI64>(),
+        op<kExprI64Shl, kWasmI64, kWasmI64>(),
+        op<kExprI64ShrU, kWasmI64, kWasmI64>(),
+        op<kExprI64ShrS, kWasmI64, kWasmI64>(),
+        op<kExprI64Ror, kWasmI64, kWasmI64>(),
+        op<kExprI64Rol, kWasmI64, kWasmI64>(),
+
+        op<kExprI64Clz, kWasmI64>(),
+        op<kExprI64Ctz, kWasmI64>(),
+        op<kExprI64Popcnt, kWasmI64>(),
+
+        block<kWasmI64>(),
+        block_br<kWasmI64>()};
+
+    static_assert(arraysize(alternates) < std::numeric_limits<uint8_t>::max(),
+                  "Too many alternates. Replace with a bigger type if needed.");
+    const auto which = data.get<uint8_t>();
+
+    alternates[which % arraysize(alternates)](data);
+  }
+}
+
+template <>
+void WasmGenerator::Generate<kWasmF32>(DataRange data) {
+  if (data.size() <= sizeof(uint32_t)) {
+    const uint32_t i = data.get<uint32_t>();
+    builder_->Emit(kExprF32Const);
+    builder_->EmitCode(reinterpret_cast<const uint8_t*>(&i), sizeof(i));
+  } else {
+    const std::function<void(DataRange)> alternates[] = {
+        op<kExprF32Add, kWasmF32, kWasmF32>(),
+        op<kExprF32Sub, kWasmF32, kWasmF32>(),
+        op<kExprF32Mul, kWasmF32, kWasmF32>(),
+
+        block<kWasmF32>(), block_br<kWasmF32>()};
+
+    static_assert(arraysize(alternates) < std::numeric_limits<uint8_t>::max(),
+                  "Too many alternates. Replace with a bigger type if needed.");
+    const auto which = data.get<uint8_t>();
+
+    alternates[which % arraysize(alternates)](data);
+  }
+}
+
+template <>
+void WasmGenerator::Generate<kWasmF64>(DataRange data) {
+  if (data.size() <= sizeof(uint64_t)) {
+    // TODO (eholk): generate full 64-bit constants
+    uint64_t i = 0;
+    while (data.size() > 0) {
+      i <<= 8;
+      i |= data.get<uint8_t>();
+    }
+    builder_->Emit(kExprF64Const);
+    builder_->EmitCode(reinterpret_cast<uint8_t*>(&i), sizeof(i));
+  } else {
+    const std::function<void(DataRange)> alternates[] = {
+        op<kExprF64Add, kWasmF64, kWasmF64>(),
+        op<kExprF64Sub, kWasmF64, kWasmF64>(),
+        op<kExprF64Mul, kWasmF64, kWasmF64>(),
+
+        block<kWasmF64>(), block_br<kWasmF64>()};
+
+    static_assert(arraysize(alternates) < std::numeric_limits<uint8_t>::max(),
+                  "Too many alternates. Replace with a bigger type if needed.");
+    const auto which = data.get<uint8_t>();
+
+    alternates[which % arraysize(alternates)](data);
+  }
+}
+
+void WasmGenerator::Generate(ValueType type, DataRange data) {
+  switch (type) {
+    case kWasmI32:
+      return Generate<kWasmI32>(data);
+    case kWasmI64:
+      return Generate<kWasmI64>(data);
+    case kWasmF32:
+      return Generate<kWasmF32>(data);
+    case kWasmF64:
+      return Generate<kWasmF64>(data);
+    default:
+      UNREACHABLE();
+  }
+}
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  // Save the flag so that we can change it and restore it later.
+  bool generate_test = v8::internal::FLAG_wasm_code_fuzzer_gen_test;
+  if (generate_test) {
+    v8::internal::OFStream os(stdout);
+
+    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 << "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(16, 32, false);" << std::endl;
+    os << "  builder.addFunction(\"test\", kSig_i_iii)" << std::endl;
+    os << "    .addBodyWithEnd([" << std::endl;
+  }
+  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, ZONE_NAME);
+
+  TestSignatures sigs;
+
+  WasmModuleBuilder builder(&zone);
+
+  v8::internal::wasm::WasmFunctionBuilder* f =
+      builder.AddFunction(sigs.i_iii());
+
+  WasmGenerator gen(f);
+  gen.Generate<kWasmI32>(DataRange(data, static_cast<uint32_t>(size)));
+
+  uint8_t end_opcode = kExprEnd;
+  f->EmitCode(&end_opcode, 1);
+  f->ExportAs(v8::internal::CStrVector("main"));
+
+  ZoneBuffer buffer(&zone);
+  builder.WriteTo(buffer);
+
+  v8::internal::wasm::testing::SetupIsolateForWasmModule(i_isolate);
+
+  v8::internal::HandleScope scope(i_isolate);
+
+  ErrorThrower interpreter_thrower(i_isolate, "Interpreter");
+  std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting(
+      i_isolate, &interpreter_thrower, buffer.begin(), buffer.end(),
+      v8::internal::wasm::ModuleOrigin::kWasmOrigin, true));
+
+  // Clear the flag so that the WebAssembly code is not printed twice.
+  v8::internal::FLAG_wasm_code_fuzzer_gen_test = false;
+  if (module == nullptr) {
+    if (generate_test) {
+      v8::internal::OFStream os(stdout);
+      os << "            ])" << std::endl;
+      os << "            .exportFunc();" << std::endl;
+      os << "  assertThrows(function() { builder.instantiate(); });"
+         << std::endl;
+      os << "})();" << std::endl;
+    }
+    return 0;
+  }
+  if (generate_test) {
+    v8::internal::OFStream os(stdout);
+    os << "            ])" << std::endl;
+    os << "            .exportFunc();" << std::endl;
+    os << "  var module = builder.instantiate();" << std::endl;
+    os << "  module.exports.test(1, 2, 3);" << std::endl;
+    os << "})();" << std::endl;
+  }
+
+  ModuleWireBytes wire_bytes(buffer.begin(), buffer.end());
+  int32_t result_interpreted;
+  bool possible_nondeterminism = false;
+  {
+    WasmVal args[] = {WasmVal(1), WasmVal(2), WasmVal(3)};
+    result_interpreted = testing::InterpretWasmModule(
+        i_isolate, &interpreter_thrower, module.get(), wire_bytes, 0, args,
+        &possible_nondeterminism);
+  }
+
+  ErrorThrower compiler_thrower(i_isolate, "Compiler");
+  v8::internal::Handle<v8::internal::JSObject> instance =
+      testing::InstantiateModuleForTesting(i_isolate, &compiler_thrower,
+                                           module.get(), wire_bytes);
+  // Restore the flag.
+  v8::internal::FLAG_wasm_code_fuzzer_gen_test = generate_test;
+  if (!interpreter_thrower.error()) {
+    CHECK(!instance.is_null());
+  } else {
+    return 0;
+  }
+  int32_t result_compiled;
+  {
+    v8::internal::Handle<v8::internal::Object> arguments[] = {
+        v8::internal::handle(v8::internal::Smi::FromInt(1), i_isolate),
+        v8::internal::handle(v8::internal::Smi::FromInt(2), i_isolate),
+        v8::internal::handle(v8::internal::Smi::FromInt(3), i_isolate)};
+    result_compiled = testing::CallWasmFunctionForTesting(
+        i_isolate, instance, &compiler_thrower, "main", arraysize(arguments),
+        arguments, v8::internal::wasm::ModuleOrigin::kWasmOrigin);
+  }
+  if (result_interpreted == bit_cast<int32_t>(0xdeadbeef) &&
+      !possible_nondeterminism) {
+    CHECK(i_isolate->has_pending_exception());
+    i_isolate->clear_pending_exception();
+  } else {
+    // The WebAssembly spec allows the sign bit of NaN to be non-deterministic.
+    // This sign bit may cause result_interpreted to be different than
+    // result_compiled. Therefore we do not check the equality of the results
+    // if the execution may have produced a NaN at some point.
+    if (!possible_nondeterminism && (result_interpreted != result_compiled)) {
+      printf("\nInterpreter returned 0x%x but compiled code returned 0x%x\n",
+             result_interpreted, result_compiled);
+      V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x",
+               v8::internal::StringHasher::HashSequentialString(
+                   data, static_cast<int>(size), WASM_CODE_FUZZER_HASH_SEED));
+    }
+  }
+  return 0;
+}
diff --git a/deps/v8/test/fuzzer/wasm-data-section.cc b/deps/v8/test/fuzzer/wasm-data-section.cc
index 2fbdbcd906..30b702fe8d 100644
--- a/deps/v8/test/fuzzer/wasm-data-section.cc
+++ b/deps/v8/test/fuzzer/wasm-data-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-function-sigs-section.cc b/deps/v8/test/fuzzer/wasm-function-sigs-section.cc
index a0b66e12d0..e621aa820e 100644
--- a/deps/v8/test/fuzzer/wasm-function-sigs-section.cc
+++ b/deps/v8/test/fuzzer/wasm-function-sigs-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-globals-section.cc b/deps/v8/test/fuzzer/wasm-globals-section.cc
index a58ef0f2b5..dccdc1079c 100644
--- a/deps/v8/test/fuzzer/wasm-globals-section.cc
+++ b/deps/v8/test/fuzzer/wasm-globals-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-imports-section.cc b/deps/v8/test/fuzzer/wasm-imports-section.cc
index d6513e59dc..4690597bba 100644
--- a/deps/v8/test/fuzzer/wasm-imports-section.cc
+++ b/deps/v8/test/fuzzer/wasm-imports-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-memory-section.cc b/deps/v8/test/fuzzer/wasm-memory-section.cc
index 77065f1729..4736d6e68d 100644
--- a/deps/v8/test/fuzzer/wasm-memory-section.cc
+++ b/deps/v8/test/fuzzer/wasm-memory-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-names-section.cc b/deps/v8/test/fuzzer/wasm-names-section.cc
index 01846823ff..9a3797cf80 100644
--- a/deps/v8/test/fuzzer/wasm-names-section.cc
+++ b/deps/v8/test/fuzzer/wasm-names-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm-section-fuzzers.cc b/deps/v8/test/fuzzer/wasm-section-fuzzers.cc
index 1ef5967aa8..e98c510b77 100644
--- a/deps/v8/test/fuzzer/wasm-section-fuzzers.cc
+++ b/deps/v8/test/fuzzer/wasm-section-fuzzers.cc
@@ -6,6 +6,7 @@
 
 #include "include/v8.h"
 #include "src/isolate.h"
+#include "src/objects-inl.h"
 #include "src/wasm/wasm-module-builder.h"
 #include "src/wasm/wasm-module.h"
 #include "src/zone/accounting-allocator.h"
diff --git a/deps/v8/test/fuzzer/wasm-section-fuzzers.h b/deps/v8/test/fuzzer/wasm-section-fuzzers.h
index a28ada134e..41ff6af687 100644
--- a/deps/v8/test/fuzzer/wasm-section-fuzzers.h
+++ b/deps/v8/test/fuzzer/wasm-section-fuzzers.h
@@ -8,7 +8,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#include "src/wasm/wasm-module.h"
+#include "src/wasm/module-decoder.h"
 
 int fuzz_wasm_section(v8::internal::wasm::WasmSectionCode section,
                       const uint8_t* data, size_t size);
diff --git a/deps/v8/test/fuzzer/wasm-types-section.cc b/deps/v8/test/fuzzer/wasm-types-section.cc
index 7d5fe65277..2d7e91e32a 100644
--- a/deps/v8/test/fuzzer/wasm-types-section.cc
+++ b/deps/v8/test/fuzzer/wasm-types-section.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/objects-inl.h"
 #include "test/fuzzer/wasm-section-fuzzers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
diff --git a/deps/v8/test/fuzzer/wasm.cc b/deps/v8/test/fuzzer/wasm.cc
index 933be71344..f179450db0 100644
--- a/deps/v8/test/fuzzer/wasm.cc
+++ b/deps/v8/test/fuzzer/wasm.cc
@@ -17,6 +17,10 @@
 #include "test/fuzzer/fuzzer-support.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  unsigned int max_mem_flag_value = v8::internal::FLAG_wasm_max_mem_pages;
+  unsigned int max_table_flag_value = v8::internal::FLAG_wasm_max_table_size;
+  v8::internal::FLAG_wasm_max_mem_pages = 32;
+  v8::internal::FLAG_wasm_max_table_size = 100;
   v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
   v8::Isolate* isolate = support->GetIsolate();
   v8::internal::Isolate* i_isolate =
@@ -34,5 +38,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   v8::internal::wasm::testing::SetupIsolateForWasmModule(i_isolate);
   v8::internal::wasm::testing::CompileAndRunWasmModule(
       i_isolate, data, data + size, v8::internal::wasm::kWasmOrigin);
+  v8::internal::FLAG_wasm_max_mem_pages = max_mem_flag_value;
+  v8::internal::FLAG_wasm_max_table_size = max_table_flag_value;
   return 0;
 }
diff --git a/deps/v8/test/fuzzer/wasm_compile/foo b/deps/v8/test/fuzzer/wasm_compile/foo
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/deps/v8/test/fuzzer/wasm_compile/foo