// 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/handles/handles.h"
#include "src/objects/objects-inl.h"
#include "src/wasm/module-decoder.h"
#include "src/wasm/wasm-features.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-opcodes.h"
#include "test/common/wasm/flag-utils.h"
#include "test/common/wasm/wasm-macro-gen.h"
#include "testing/gmock-support.h"

using testing::HasSubstr;

namespace v8 {
namespace internal {
namespace wasm {
namespace module_decoder_unittest {

#define WASM_INIT_EXPR_I32V_1(val) WASM_I32V_1(val), kExprEnd
#define WASM_INIT_EXPR_I32V_2(val) WASM_I32V_2(val), kExprEnd
#define WASM_INIT_EXPR_I32V_3(val) WASM_I32V_3(val), kExprEnd
#define WASM_INIT_EXPR_I32V_4(val) WASM_I32V_4(val), kExprEnd
#define WASM_INIT_EXPR_I32V_5(val) WASM_I32V_5(val), kExprEnd
#define WASM_INIT_EXPR_F32(val) WASM_F32(val), kExprEnd
#define WASM_INIT_EXPR_I64(val) WASM_I64(val), kExprEnd
#define WASM_INIT_EXPR_F64(val) WASM_F64(val), kExprEnd
#define WASM_INIT_EXPR_EXTERN_REF_NULL WASM_REF_NULL(kExternRefCode), kExprEnd
#define WASM_INIT_EXPR_FUNC_REF_NULL WASM_REF_NULL(kFuncRefCode), kExprEnd
#define WASM_INIT_EXPR_REF_FUNC(val) WASM_REF_FUNC(val), kExprEnd
#define WASM_INIT_EXPR_GLOBAL(index) WASM_GET_GLOBAL(index), kExprEnd

#define REF_NULL_ELEMENT kExprRefNull, kFuncRefCode, kExprEnd
#define REF_FUNC_ELEMENT(v) kExprRefFunc, U32V_1(v), kExprEnd

#define EMPTY_BODY 0
#define NOP_BODY 2, 0, kExprNop

#define SIG_ENTRY_i_i SIG_ENTRY_x_x(kI32Code, kI32Code)

#define UNKNOWN_SECTION(size) 0, U32V_1(size + 5), ADD_COUNT('l', 'u', 'l', 'z')
#define TYPE_SECTION(count, ...) SECTION(Type, U32V_1(count), __VA_ARGS__)
#define FUNCTION_SECTION(count, ...) \
  SECTION(Function, U32V_1(count), __VA_ARGS__)

#define FOO_STRING ADD_COUNT('f', 'o', 'o')
#define NO_LOCAL_NAMES 0

#define EMPTY_TYPE_SECTION SECTION(Type, ENTRY_COUNT(0))
#define EMPTY_FUNCTION_SECTION SECTION(Function, ENTRY_COUNT(0))
#define EMPTY_FUNCTION_BODIES_SECTION SECTION(Code, ENTRY_COUNT(0))
#define SECTION_NAMES(...) \
  SECTION(Unknown, ADD_COUNT('n', 'a', 'm', 'e'), ##__VA_ARGS__)
#define EMPTY_NAMES_SECTION SECTION_NAMES()
#define SECTION_SRC_MAP(...)                                               \
  SECTION(Unknown,                                                         \
          ADD_COUNT('s', 'o', 'u', 'r', 'c', 'e', 'M', 'a', 'p', 'p', 'i', \
                    'n', 'g', 'U', 'R', 'L'),                              \
          ADD_COUNT(__VA_ARGS__))
#define SECTION_COMPILATION_HINTS(...)                                     \
  SECTION(Unknown,                                                         \
          ADD_COUNT('c', 'o', 'm', 'p', 'i', 'l', 'a', 't', 'i', 'o', 'n', \
                    'H', 'i', 'n', 't', 's'),                              \
          ADD_COUNT(__VA_ARGS__))

#define FAIL_IF_NO_EXPERIMENTAL_EH(data)                                 \
  do {                                                                   \
    ModuleResult result = DecodeModule((data), (data) + sizeof((data))); \
    EXPECT_FALSE(result.ok());                                           \
  } while (false)

#define X1(...) __VA_ARGS__
#define X2(...) __VA_ARGS__, __VA_ARGS__
#define X3(...) __VA_ARGS__, __VA_ARGS__, __VA_ARGS__
#define X4(...) __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__

#define ONE_EMPTY_FUNCTION(sig_index) \
  SECTION(Function, ENTRY_COUNT(1), X1(sig_index))

#define TWO_EMPTY_FUNCTIONS(sig_index) \
  SECTION(Function, ENTRY_COUNT(2), X2(sig_index))

#define THREE_EMPTY_FUNCTIONS(sig_index) \
  SECTION(Function, ENTRY_COUNT(3), X3(sig_index))

#define FOUR_EMPTY_FUNCTIONS(sig_index) \
  SECTION(Function, ENTRY_COUNT(4), X4(sig_index))

#define ONE_EMPTY_BODY SECTION(Code, ENTRY_COUNT(1), X1(EMPTY_BODY))
#define TWO_EMPTY_BODIES SECTION(Code, ENTRY_COUNT(2), X2(EMPTY_BODY))
#define THREE_EMPTY_BODIES SECTION(Code, ENTRY_COUNT(3), X3(EMPTY_BODY))
#define FOUR_EMPTY_BODIES SECTION(Code, ENTRY_COUNT(4), X4(EMPTY_BODY))

#define TYPE_SECTION_ONE_SIG_VOID_VOID \
  SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_v_v)

#define LINEAR_MEMORY_INDEX_0 0

#define EXCEPTION_ENTRY(sig_index) U32V_1(kExceptionAttribute), sig_index

#define FIELD_COUNT(count) U32V_1(count)
#define STRUCT_FIELD(type, mutability) type, (mutability ? 1 : 0)
#define WASM_REF(index) kRefCode, index
#define WASM_OPT_REF(index) kOptRefCode, index
#define WASM_STRUCT_DEF(...) kWasmStructTypeCode, __VA_ARGS__
#define WASM_ARRAY_DEF(type, mutability) \
  kWasmArrayTypeCode, type, (mutability ? 1 : 0)
#define WASM_FUNCTION_DEF(...) kWasmFunctionTypeCode, __VA_ARGS__

#define EXPECT_VERIFIES(data)                                      \
  do {                                                             \
    ModuleResult result = DecodeModule(data, data + sizeof(data)); \
    EXPECT_OK(result);                                             \
  } while (false)

#define EXPECT_FAILURE_LEN(data, length)                     \
  do {                                                       \
    ModuleResult result = DecodeModule(data, data + length); \
    EXPECT_FALSE(result.ok());                               \
  } while (false)

#define EXPECT_FAILURE(data) EXPECT_FAILURE_LEN(data, sizeof(data))

#define EXPECT_FAILURE_WITH_MSG(data, msg)                         \
  do {                                                             \
    ModuleResult result = DecodeModule(data, data + sizeof(data)); \
    EXPECT_FALSE(result.ok());                                     \
    if (!result.ok()) {                                            \
      EXPECT_THAT(result.error().message(), HasSubstr(msg));       \
    }                                                              \
  } while (false)

#define EXPECT_OFF_END_FAILURE(data, min)                           \
  do {                                                              \
    STATIC_ASSERT(min < arraysize(data));                           \
    for (size_t length = min; length < arraysize(data); length++) { \
      EXPECT_FAILURE_LEN(data, length);                             \
    }                                                               \
  } while (false)

#define EXPECT_OK(result)                                        \
  do {                                                           \
    if (!result.ok()) {                                          \
      GTEST_NONFATAL_FAILURE_(result.error().message().c_str()); \
      return;                                                    \
    }                                                            \
  } while (false)

#define EXPECT_NOT_OK(result, msg)                         \
  do {                                                     \
    EXPECT_FALSE(result.ok());                             \
    EXPECT_THAT(result.error().message(), HasSubstr(msg)); \
  } while (false)

static size_t SizeOfVarInt(size_t value) {
  size_t size = 0;
  do {
    size++;
    value = value >> 7;
  } while (value > 0);
  return size;
}

struct ValueTypePair {
  uint8_t code;
  ValueType type;
} kValueTypes[] = {
    {kI32Code, kWasmI32},              // --
    {kI64Code, kWasmI64},              // --
    {kF32Code, kWasmF32},              // --
    {kF64Code, kWasmF64},              // --
    {kFuncRefCode, kWasmFuncRef},      // --
    {kExternRefCode, kWasmExternRef},  // --
};

class WasmModuleVerifyTest : public TestWithIsolateAndZone {
 public:
  WasmFeatures enabled_features_ = WasmFeatures::None();

  ModuleResult DecodeModule(const byte* module_start, const byte* module_end) {
    // Add the wasm magic and version number automatically.
    size_t size = static_cast<size_t>(module_end - module_start);
    byte header[] = {WASM_MODULE_HEADER};
    size_t total = sizeof(header) + size;
    auto temp = new byte[total];
    memcpy(temp, header, sizeof(header));
    if (size > 0) {
      memcpy(temp + sizeof(header), module_start, size);
    }
    ModuleResult result = DecodeWasmModule(
        enabled_features_, temp, temp + total, false, kWasmOrigin,
        isolate()->counters(), isolate()->metrics_recorder(),
        v8::metrics::Recorder::ContextId::Empty(), DecodingMethod::kSync,
        isolate()->wasm_engine()->allocator());
    delete[] temp;
    return result;
  }
  ModuleResult DecodeModuleNoHeader(const byte* module_start,
                                    const byte* module_end) {
    return DecodeWasmModule(
        enabled_features_, module_start, module_end, false, kWasmOrigin,
        isolate()->counters(), isolate()->metrics_recorder(),
        v8::metrics::Recorder::ContextId::Empty(), DecodingMethod::kSync,
        isolate()->wasm_engine()->allocator());
  }
};

TEST_F(WasmModuleVerifyTest, WrongMagic) {
  for (uint32_t x = 1; x; x <<= 1) {
    const byte data[] = {U32_LE(kWasmMagic ^ x), U32_LE(kWasmVersion)};
    ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
    EXPECT_FALSE(result.ok());
  }
}

TEST_F(WasmModuleVerifyTest, WrongVersion) {
  for (uint32_t x = 1; x; x <<= 1) {
    const byte data[] = {U32_LE(kWasmMagic), U32_LE(kWasmVersion ^ x)};
    ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
    EXPECT_FALSE(result.ok());
  }
}

TEST_F(WasmModuleVerifyTest, DecodeEmpty) {
  ModuleResult result = DecodeModule(nullptr, nullptr);
  EXPECT_TRUE(result.ok());
}

TEST_F(WasmModuleVerifyTest, OneGlobal) {
  static const byte data[] = {
      SECTION(Global,                     // --
              ENTRY_COUNT(1),             // --
              kI32Code,                   // local type
              0,                          // immutable
              WASM_INIT_EXPR_I32V_1(13))  // init
  };

  {
    // Should decode to exactly one global.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(1u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* global = &result.value()->globals.back();

    EXPECT_EQ(kWasmI32, global->type);
    EXPECT_EQ(0u, global->offset);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kI32Const, global->init.kind());
    EXPECT_EQ(13, global->init.immediate().i32_const);
  }

  EXPECT_OFF_END_FAILURE(data, 1);
}

TEST_F(WasmModuleVerifyTest, S128Global) {
  WASM_FEATURE_SCOPE(simd);
  std::array<uint8_t, kSimd128Size> v = {1, 2,  3,  4,  5,  6,  7, 8,
                                         9, 10, 11, 12, 13, 14, 15};
  static const byte data[] = {SECTION(Global,          // --
                                      ENTRY_COUNT(1),  // --
                                      kS128Code,       // memory type
                                      0,               // immutable
                                      WASM_SIMD_CONSTANT(v.data()), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  const WasmGlobal* global = &result.value()->globals.back();
  EXPECT_EQ(kWasmS128, global->type);
  EXPECT_EQ(0u, global->offset);
  EXPECT_FALSE(global->mutability);
  EXPECT_EQ(WasmInitExpr::kS128Const, global->init.kind());
  EXPECT_EQ(global->init.immediate().s128_const, v);
}

TEST_F(WasmModuleVerifyTest, ExternRefGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      TWO_EMPTY_FUNCTIONS(SIG_INDEX(0)),
      SECTION(Global,                          // --
              ENTRY_COUNT(2),                  // --
              kExternRefCode,                  // local type
              0,                               // immutable
              WASM_INIT_EXPR_EXTERN_REF_NULL,  // init
              kFuncRefCode,                    // local type
              0,                               // immutable
              WASM_INIT_EXPR_REF_FUNC(1)),     // init
      SECTION(Element,                         // section name
              ENTRY_COUNT(2),                  // entry count
              DECLARATIVE,                     // flags 0
              kExternalFunction,               // type
              ENTRY_COUNT(1),                  // func entry count
              FUNC_INDEX(0),                   // func index
              DECLARATIVE_WITH_ELEMENTS,       // flags 1
              kFuncRefCode,                    // local type
              ENTRY_COUNT(1),                  // func ref count
              REF_FUNC_ELEMENT(1)),            // func ref
      TWO_EMPTY_BODIES};

  {
    // Should decode to two globals.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(2u, result.value()->globals.size());
    EXPECT_EQ(2u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* global = &result.value()->globals[0];
    EXPECT_EQ(kWasmExternRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kRefNullConst, global->init.kind());

    global = &result.value()->globals[1];
    EXPECT_EQ(kWasmFuncRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kRefFuncConst, global->init.kind());
    EXPECT_EQ(uint32_t{1}, global->init.immediate().index);
  }
}

TEST_F(WasmModuleVerifyTest, FuncRefGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      TWO_EMPTY_FUNCTIONS(SIG_INDEX(0)),
      SECTION(Global,                        // --
              ENTRY_COUNT(2),                // --
              kFuncRefCode,                  // local type
              0,                             // immutable
              WASM_INIT_EXPR_FUNC_REF_NULL,  // init
              kFuncRefCode,                  // local type
              0,                             // immutable
              WASM_INIT_EXPR_REF_FUNC(1)),   // init
      SECTION(Element,                       // section name
              ENTRY_COUNT(2),                // entry count
              DECLARATIVE,                   // flags 0
              kExternalFunction,             // type
              ENTRY_COUNT(1),                // func entry count
              FUNC_INDEX(0),                 // func index
              DECLARATIVE_WITH_ELEMENTS,     // flags 1
              kFuncRefCode,                  // local type
              ENTRY_COUNT(1),                // func ref count
              REF_FUNC_ELEMENT(1)),          // func ref
      TWO_EMPTY_BODIES};
  {
    // Should decode to two globals.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(2u, result.value()->globals.size());
    EXPECT_EQ(2u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* global = &result.value()->globals[0];
    EXPECT_EQ(kWasmFuncRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kRefNullConst, global->init.kind());

    global = &result.value()->globals[1];
    EXPECT_EQ(kWasmFuncRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kRefFuncConst, global->init.kind());
    EXPECT_EQ(uint32_t{1}, global->init.immediate().index);
  }
}

TEST_F(WasmModuleVerifyTest, InvalidFuncRefGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      TWO_EMPTY_FUNCTIONS(SIG_INDEX(0)),
      SECTION(Global,                       // --
              ENTRY_COUNT(1),               // --
              kFuncRefCode,                 // local type
              0,                            // immutable
              WASM_INIT_EXPR_REF_FUNC(7)),  // invalid function index
      TWO_EMPTY_BODIES};
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ExternRefGlobalWithGlobalInit) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {
      SECTION(Import,           // --
              ENTRY_COUNT(1),   // number of imports
              ADD_COUNT('m'),   // module name
              ADD_COUNT('f'),   // global name
              kExternalGlobal,  // import kind
              kExternRefCode,   // type
              0),               // mutability
      SECTION(Global,           // --
              ENTRY_COUNT(1),
              kExternRefCode,  // local type
              0,               // immutable
              WASM_INIT_EXPR_GLOBAL(0)),
  };

  {
    // Should decode to exactly one global.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(2u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* global = &result.value()->globals.back();

    EXPECT_EQ(kWasmExternRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kGlobalGet, global->init.kind());
  }
}

TEST_F(WasmModuleVerifyTest, NullGlobalWithGlobalInit) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {
      SECTION(Import,           // --
              ENTRY_COUNT(1),   // number of imports
              ADD_COUNT('m'),   // module name
              ADD_COUNT('n'),   // global name
              kExternalGlobal,  // import kind
              kExternRefCode,   // type
              0),               // mutability
      SECTION(Global,           // --
              ENTRY_COUNT(1),
              kExternRefCode,  // local type
              0,               // immutable
              WASM_INIT_EXPR_GLOBAL(0)),
  };

  {
    // Should decode to exactly one global.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    std::cout << result.error().message() << std::endl;
    EXPECT_OK(result);
    EXPECT_EQ(2u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* global = &result.value()->globals.back();

    EXPECT_EQ(kWasmExternRef, global->type);
    EXPECT_FALSE(global->mutability);
    EXPECT_EQ(WasmInitExpr::kGlobalGet, global->init.kind());
  }
}

TEST_F(WasmModuleVerifyTest, GlobalInvalidType) {
  static const byte data[] = {
      SECTION(Global,                      // --
              ENTRY_COUNT(1),              // --
              64,                          // invalid value type
              1,                           // mutable
              WASM_INIT_EXPR_I32V_1(33)),  // init
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, GlobalInvalidType2) {
  static const byte data[] = {
      SECTION(Global,                      // --
              ENTRY_COUNT(1),              // --
              kVoidCode,                   // invalid value type
              1,                           // mutable
              WASM_INIT_EXPR_I32V_1(33)),  // init
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, GlobalInitializer) {
  static const byte no_initializer_no_end[] = {
      SECTION(Global,          //--
              ENTRY_COUNT(1),  //--
              kI32Code,        // type
              1)               // mutable
  };
  EXPECT_FAILURE_WITH_MSG(no_initializer_no_end,
                          "Global initializer is missing 'end'");

  static const byte no_initializer[] = {
      SECTION(Global,          //--
              ENTRY_COUNT(1),  //--
              kI32Code,        // type
              1,               // mutable
              kExprEnd)        // --
  };
  EXPECT_FAILURE_WITH_MSG(no_initializer,
                          "Found 'end' in global initalizer, but no "
                          "expressions were found on the stack");

  static const byte too_many_initializers_no_end[] = {
      SECTION(Global,           // --
              ENTRY_COUNT(1),   // --
              kI32Code,         // type
              1,                // mutable
              WASM_I32V_1(42),  // one value is good
              WASM_I32V_1(43))  // another value is too much
  };
  EXPECT_FAILURE_WITH_MSG(too_many_initializers_no_end,
                          "Global initializer is missing 'end'");

  static const byte too_many_initializers[] = {
      SECTION(Global,           // --
              ENTRY_COUNT(1),   // --
              kI32Code,         // type
              1,                // mutable
              WASM_I32V_1(42),  // one value is good
              WASM_I32V_1(43),  // another value is too much
              kExprEnd)};
  EXPECT_FAILURE_WITH_MSG(too_many_initializers,
                          "Found 'end' in global initalizer, but more than one "
                          "expressions were found on the stack");

  static const byte missing_end_opcode[] = {
      SECTION(Global,           // --
              ENTRY_COUNT(1),   // --
              kI32Code,         // type
              1,                // mutable
              WASM_I32V_1(42))  // init value
  };
  EXPECT_FAILURE_WITH_MSG(missing_end_opcode,
                          "Global initializer is missing 'end'");

  static const byte referencing_out_of_bounds_global[] = {
      SECTION(Global, ENTRY_COUNT(1),         // --
              kI32Code,                       // type
              1,                              // mutable
              WASM_GET_GLOBAL(42), kExprEnd)  // init value
  };
  EXPECT_FAILURE_WITH_MSG(referencing_out_of_bounds_global,
                          "global index is out of bounds");

  static const byte referencing_undefined_global[] = {
      SECTION(Global, ENTRY_COUNT(2),        // --
              kI32Code,                      // type
              0,                             // mutable
              WASM_GET_GLOBAL(1), kExprEnd,  // init value
              kI32Code,                      // type
              0,                             // mutable
              WASM_I32V(0), kExprEnd)        // init value
  };
  EXPECT_FAILURE_WITH_MSG(referencing_undefined_global,
                          "global #1 is not defined yet");

  {
    WASM_FEATURE_SCOPE(reftypes);
    WASM_FEATURE_SCOPE(typed_funcref);
    WASM_FEATURE_SCOPE(gc);
    static const byte referencing_undefined_global_nested[] = {
        SECTION(Global, ENTRY_COUNT(2),                  // --
                WASM_RTT(2, kFuncRefCode),               // type
                0,                                       // mutable
                WASM_RTT_SUB(kFuncRefCode,               // init value
                             WASM_GET_GLOBAL(1)),        // --
                kExprEnd,                                // --
                WASM_RTT(1, kFuncRefCode),               // type
                0,                                       // mutable
                WASM_RTT_CANON(kFuncRefCode), kExprEnd)  // init value
    };
    EXPECT_FAILURE_WITH_MSG(referencing_undefined_global_nested,
                            "global #1 is not defined yet");
  }

  static const byte referencing_mutable_global[] = {
      SECTION(Global, ENTRY_COUNT(2),        // --
              kI32Code,                      // type
              1,                             // mutable
              WASM_I32V(1), kExprEnd,        // init value
              kI32Code,                      // type
              0,                             // mutable
              WASM_GET_GLOBAL(0), kExprEnd)  // init value
  };
  EXPECT_FAILURE_WITH_MSG(
      referencing_mutable_global,
      "mutable globals cannot be used in initializer expressions");

  static const byte referencing_mutable_imported_global[] = {
      SECTION(Import, ENTRY_COUNT(1),          // --
              ADD_COUNT('m'), ADD_COUNT('n'),  // module, name
              kExternalGlobal,                 // --
              kI32Code,                        // type
              1),                              // mutable
      SECTION(Global, ENTRY_COUNT(1),          // --
              kI32Code,                        // type
              0,                               // mutable
              WASM_GET_GLOBAL(0), kExprEnd)    // init value
  };
  EXPECT_FAILURE_WITH_MSG(
      referencing_mutable_imported_global,
      "mutable globals cannot be used in initializer expressions");

  static const byte referencing_immutable_imported_global[] = {
      SECTION(Import, ENTRY_COUNT(1),          // --
              ADD_COUNT('m'), ADD_COUNT('n'),  // module, name
              kExternalGlobal,                 // --
              kI32Code,                        // type
              0),                              // mutable
      SECTION(Global, ENTRY_COUNT(1),          // --
              kI32Code,                        // type
              0,                               // mutable
              WASM_GET_GLOBAL(0), kExprEnd)    // init value
  };
  EXPECT_VERIFIES(referencing_immutable_imported_global);

  static const byte referencing_local_global[] = {
      SECTION(Global, ENTRY_COUNT(2),        // --
              kI32Code,                      // type
              0,                             // mutable
              WASM_I32V(1), kExprEnd,        // init value
              kI32Code,                      // type
              0,                             // mutable
              WASM_GET_GLOBAL(0), kExprEnd)  // init value
  };
  EXPECT_FAILURE_WITH_MSG(
      referencing_local_global,
      "non-imported globals cannot be used in initializer expressions");

  {
    // But: experimental-wasm-gc should enable referencing immutable local
    // globals.
    WASM_FEATURE_SCOPE(gc);
    EXPECT_VERIFIES(referencing_local_global);
    // Referencing mutable glocals still invalid.
    EXPECT_FAILURE_WITH_MSG(
        referencing_mutable_global,
        "mutable globals cannot be used in initializer expressions");
  }
}

TEST_F(WasmModuleVerifyTest, ZeroGlobals) {
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(0))};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, ExportMutableGlobal) {
  {
    static const byte data[] = {
        SECTION(Global,                         // --
                ENTRY_COUNT(1),                 // --
                kI32Code,                       // local type
                0,                              // immutable
                WASM_INIT_EXPR_I32V_1(13)),     // init
        SECTION(Export,                         // --
                ENTRY_COUNT(1),                 // export count
                ADD_COUNT('n', 'a', 'm', 'e'),  // name
                kExternalGlobal,                // global
                0),                             // global index
    };
    EXPECT_VERIFIES(data);
  }
  {
    static const byte data[] = {
        SECTION(Global,                         // --
                ENTRY_COUNT(1),                 // --
                kI32Code,                       // local type
                1,                              // mutable
                WASM_INIT_EXPR_I32V_1(13)),     // init
        SECTION(Export,                         // --
                ENTRY_COUNT(1),                 // export count
                ADD_COUNT('n', 'a', 'm', 'e'),  // name
                kExternalGlobal,                // global
                0),                             // global index
    };
    EXPECT_VERIFIES(data);
  }
}

static void AppendUint32v(std::vector<byte>* buffer, uint32_t val) {
  while (true) {
    uint32_t next = val >> 7;
    uint32_t out = val & 0x7F;
    if (next) {
      buffer->push_back(static_cast<byte>(0x80 | out));
      val = next;
    } else {
      buffer->push_back(static_cast<byte>(out));
      break;
    }
  }
}

TEST_F(WasmModuleVerifyTest, NGlobals) {
  static const byte data[] = {
      kF32Code,                 // memory type
      0,                        // immutable
      WASM_INIT_EXPR_F32(7.7),  // init
  };

  for (uint32_t i = 0; i < kV8MaxWasmGlobals; i = i * 13 + 1) {
    std::vector<byte> buffer;
    size_t size = SizeOfVarInt(i) + i * sizeof(data);
    const byte globals[] = {kGlobalSectionCode, U32V_5(size)};
    for (size_t g = 0; g != sizeof(globals); ++g) {
      buffer.push_back(globals[g]);
    }
    AppendUint32v(&buffer, i);  // Number of globals.
    for (uint32_t j = 0; j < i; j++) {
      buffer.insert(buffer.end(), data, data + sizeof(data));
    }

    ModuleResult result = DecodeModule(&buffer[0], &buffer[0] + buffer.size());
    EXPECT_OK(result);
  }
}

TEST_F(WasmModuleVerifyTest, TwoGlobals) {
  static const byte data[] = {SECTION(Global,                      // --
                                      ENTRY_COUNT(2),              // --
                                      kF32Code,                    // type
                                      0,                           // immutable
                                      WASM_INIT_EXPR_F32(22.0),    // --
                                      kF64Code,                    // type
                                      1,                           // mutable
                                      WASM_INIT_EXPR_F64(23.0))};  // --

  {
    // Should decode to exactly two globals.
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(2u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(0u, result.value()->data_segments.size());

    const WasmGlobal* g0 = &result.value()->globals[0];

    EXPECT_EQ(kWasmF32, g0->type);
    EXPECT_EQ(0u, g0->offset);
    EXPECT_FALSE(g0->mutability);
    EXPECT_EQ(WasmInitExpr::kF32Const, g0->init.kind());

    const WasmGlobal* g1 = &result.value()->globals[1];

    EXPECT_EQ(kWasmF64, g1->type);
    EXPECT_EQ(8u, g1->offset);
    EXPECT_TRUE(g1->mutability);
    EXPECT_EQ(WasmInitExpr::kF64Const, g1->init.kind());
  }

  EXPECT_OFF_END_FAILURE(data, 1);
}

TEST_F(WasmModuleVerifyTest, RefNullGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(1), kFuncRefCode, 1,
                                      WASM_REF_NULL(kFuncRefCode), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, RefNullGlobalInvalid1) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(1), kOptRefCode, 0, 1,
                                      WASM_REF_NULL(0), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "Type index 0 is out of bounds");
}

TEST_F(WasmModuleVerifyTest, RefNullGlobalInvalid2) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(1), kFuncRefCode, 1,
                                      kExprRefNull, U32V_5(1000001), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result,
                "Type index 1000001 is greater than the maximum number 1000000 "
                "of type definitions supported by V8");
}

TEST_F(WasmModuleVerifyTest, RttCanonGlobalGeneric) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(1),
                                      WASM_RTT(1, kFuncRefCode), 1,
                                      WASM_RTT_CANON(kFuncRefCode), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, RttCanonGlobalStruct) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1),
              WASM_STRUCT_DEF(FIELD_COUNT(1), STRUCT_FIELD(kI32Code, true))),
      SECTION(Global, ENTRY_COUNT(1), WASM_RTT(1, 0), 0, WASM_RTT_CANON(0),
              kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, RttCanonGlobalTypeError) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(1),
                                      WASM_RTT(1, kExternRefCode), 1,
                                      WASM_RTT_CANON(kFuncRefCode), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result,
                "type error in init expression, expected (rtt 1 extern), got "
                "(rtt 1 func)");
}

TEST_F(WasmModuleVerifyTest, GlobalRttSubOfCanon) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {
      SECTION(Global, ENTRY_COUNT(1), WASM_RTT(2, kI31RefCode), 1,
              WASM_RTT_SUB(kI31RefCode, WASM_RTT_CANON(kEqRefCode)), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  WasmInitExpr expected = WasmInitExpr::RttSub(
      HeapType::kI31, WasmInitExpr::RttCanon(HeapType::kEq));
  EXPECT_OK(result);
  EXPECT_EQ(result.value()->globals.front().init, expected);
}

TEST_F(WasmModuleVerifyTest, GlobalRttSubOfSubOfCanon) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {SECTION(
      Global, ENTRY_COUNT(1), WASM_RTT(3, kEqRefCode), 1,
      WASM_RTT_SUB(kEqRefCode,
                   WASM_RTT_SUB(kEqRefCode, WASM_RTT_CANON(kEqRefCode))),
      kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  WasmInitExpr expected = WasmInitExpr::RttSub(
      HeapType::kEq, WasmInitExpr::RttSub(
                         HeapType::kEq, WasmInitExpr::RttCanon(HeapType::kEq)));
  EXPECT_OK(result);
  EXPECT_EQ(result.value()->globals.front().init, expected);
}

TEST_F(WasmModuleVerifyTest, GlobalRttSubOfGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {
      SECTION(Import,                   // section header
              ENTRY_COUNT(1),           // number of imports
              ADD_COUNT('m'),           // module name
              ADD_COUNT('f'),           // global name
              kExternalGlobal,          // import kind
              WASM_RTT(1, kEqRefCode),  // type
              0),                       // mutability
      SECTION(Global, ENTRY_COUNT(1), WASM_RTT(2, kI31RefCode), 1,
              WASM_RTT_SUB(kI31RefCode, WASM_GET_GLOBAL(0)), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  WasmInitExpr expected =
      WasmInitExpr::RttSub(HeapType::kI31, WasmInitExpr::GlobalGet(0));
  EXPECT_OK(result);
  EXPECT_EQ(result.value()->globals[1].init, expected);
}

TEST_F(WasmModuleVerifyTest, GlobalRttSubOfGlobalTypeError) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {
      SECTION(Import,           // section header
              ENTRY_COUNT(1),   // number of imports
              ADD_COUNT('m'),   // module name
              ADD_COUNT('f'),   // global name
              kExternalGlobal,  // import kind
              kI32Code,         // type
              0),               // mutability
      SECTION(Global, ENTRY_COUNT(1), WASM_RTT(2, kExternRefCode), 1,
              WASM_RTT_SUB(kExternRefCode, WASM_GET_GLOBAL(0)), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "rtt.sub requires a supertype rtt on stack");
}

TEST_F(WasmModuleVerifyTest, GlobalRttSubIllegalParent) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {SECTION(
      Global, ENTRY_COUNT(1), WASM_RTT(2, kEqRefCode), 1,
      WASM_RTT_SUB(kEqRefCode, WASM_RTT_CANON(kExternRefCode)), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "rtt.sub requires a supertype rtt on stack");
}

TEST_F(WasmModuleVerifyTest, RttSubGlobalTypeError) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {SECTION(
      Global, ENTRY_COUNT(1), WASM_RTT(1 /* Should be 2 */, kI31RefCode), 1,
      WASM_RTT_SUB(kI31RefCode, WASM_RTT_CANON(kEqRefCode)), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result,
                "type error in init expression, expected (rtt 1 i31), got "
                "(rtt 2 i31)");
}

TEST_F(WasmModuleVerifyTest, EmptyStruct) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte empty_struct[] = {SECTION(Type, ENTRY_COUNT(1),  // --
                                              kWasmStructTypeCode,   // --
                                              U32V_1(0))};  // field count

  EXPECT_VERIFIES(empty_struct);
}

TEST_F(WasmModuleVerifyTest, InvalidStructTypeDef) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte all_good[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kI32Code,              // perfectly valid field type
              1)};                   // mutability
  EXPECT_VERIFIES(all_good);

  static const byte invalid_field_type[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kWasmArrayTypeCode,    // bogus field type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(invalid_field_type, "invalid value type");

  static const byte field_type_oob_ref[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kOptRefCode,           // field type: reference...
              3,                     // ...to nonexistent type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_oob_ref, "Type index 3 is out of bounds");

  static const byte field_type_invalid_ref[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kOptRefCode,           // field type: reference...
              U32V_4(1234567),       // ...to a type > kV8MaxWasmTypes
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_invalid_ref, "greater than the maximum");

  static const byte field_type_invalid_ref2[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kOptRefCode,           // field type: reference...
              kI32Code,              // ...to a non-referenceable type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_invalid_ref2, "Unknown heap type");

  static const byte not_enough_field_types[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(2),             // field count
              kI32Code,              // field type 1
              1)};                   // mutability 1
  EXPECT_FAILURE_WITH_MSG(not_enough_field_types, "expected 1 byte");

  static const byte not_enough_field_types2[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(2),             // field count
              kI32Code,              // field type 1
              1,                     // mutability 1
              kI32Code)};            // field type 2
  EXPECT_FAILURE_WITH_MSG(not_enough_field_types2, "expected 1 byte");

  static const byte invalid_mutability[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmStructTypeCode,   // --
              U32V_1(1),             // field count
              kI32Code,              // field type
              2)};                   // invalid mutability value
  EXPECT_FAILURE_WITH_MSG(invalid_mutability, "invalid mutability");
}

TEST_F(WasmModuleVerifyTest, InvalidArrayTypeDef) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte all_good[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kI32Code,              // perfectly valid field type
              1)};                   // mutability
  EXPECT_VERIFIES(all_good);

  static const byte invalid_field_type[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kWasmArrayTypeCode,    // bogus field type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(invalid_field_type, "invalid value type");

  static const byte field_type_oob_ref[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kOptRefCode,           // field type: reference...
              3,                     // ...to nonexistent type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_oob_ref, "Type index 3 is out of bounds");

  static const byte field_type_invalid_ref[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kOptRefCode,           // field type: reference...
              U32V_3(1234567),       // ...to a type > kV8MaxWasmTypes
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_invalid_ref, "Unknown heap type");

  static const byte field_type_invalid_ref2[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kOptRefCode,           // field type: reference...
              kI32Code,              // ...to a non-referenceable type
              1)};                   // mutability
  EXPECT_FAILURE_WITH_MSG(field_type_invalid_ref2, "Unknown heap type");

  static const byte invalid_mutability[] = {
      SECTION(Type, ENTRY_COUNT(1),  // --
              kWasmArrayTypeCode,    // --
              kI32Code,              // field type
              2)};                   // invalid mutability value
  EXPECT_FAILURE_WITH_MSG(invalid_mutability, "invalid mutability");

  static const byte invalid_mutability2[] = {
      SECTION(Type,
              ENTRY_COUNT(1),      // --
              kWasmArrayTypeCode,  // --
              kI32Code,            // field type
              0)};                 // immmutability (disallowed in MVP)
  EXPECT_FAILURE_WITH_MSG(invalid_mutability2,
                          "immutable arrays are not supported");
}

TEST_F(WasmModuleVerifyTest, ZeroExceptions) {
  static const byte data[] = {SECTION(Exception, ENTRY_COUNT(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(0u, result.value()->exceptions.size());
}

TEST_F(WasmModuleVerifyTest, OneI32Exception) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_v_x(kI32Code)),  // sig#0 (i32)
      SECTION(Exception, ENTRY_COUNT(1),
              EXCEPTION_ENTRY(SIG_INDEX(0)))};  // except[0] (sig#0)
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(1u, result.value()->exceptions.size());

  const WasmException& e0 = result.value()->exceptions.front();
  EXPECT_EQ(1u, e0.sig->parameter_count());
  EXPECT_EQ(kWasmI32, e0.sig->GetParam(0));
}

TEST_F(WasmModuleVerifyTest, TwoExceptions) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(2),
              SIG_ENTRY_v_x(kI32Code),              // sig#0 (i32)
              SIG_ENTRY_v_xx(kF32Code, kI64Code)),  // sig#1 (f32, i64)
      SECTION(Exception, ENTRY_COUNT(2),
              EXCEPTION_ENTRY(SIG_INDEX(1)),    // except[0] (sig#1)
              EXCEPTION_ENTRY(SIG_INDEX(0)))};  // except[1] (sig#0)
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(2u, result.value()->exceptions.size());
  const WasmException& e0 = result.value()->exceptions.front();
  EXPECT_EQ(2u, e0.sig->parameter_count());
  EXPECT_EQ(kWasmF32, e0.sig->GetParam(0));
  EXPECT_EQ(kWasmI64, e0.sig->GetParam(1));
  const WasmException& e1 = result.value()->exceptions.back();
  EXPECT_EQ(kWasmI32, e1.sig->GetParam(0));
}

TEST_F(WasmModuleVerifyTest, Exception_invalid_sig_index) {
  static const byte data[] = {
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      SECTION(Exception, ENTRY_COUNT(1),
              EXCEPTION_ENTRY(
                  SIG_INDEX(23)))};  // except[0] (sig#23 [out-of-bounds])
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  // Should fail decoding exception section.
  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "signature index 23 out of bounds");
}

TEST_F(WasmModuleVerifyTest, Exception_invalid_sig_return) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_i_i),
      SECTION(Exception, ENTRY_COUNT(1),
              EXCEPTION_ENTRY(
                  SIG_INDEX(0)))};  // except[0] (sig#0 [invalid-return-type])
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  // Should fail decoding exception section.
  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "exception signature 0 has non-void return");
}

TEST_F(WasmModuleVerifyTest, Exception_invalid_attribute) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_i_i),
      SECTION(Exception, ENTRY_COUNT(1), 23,
              SIG_INDEX(0))};  // except[0] (sig#0) [invalid-attribute]
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  // Should fail decoding exception section.
  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "exception attribute 23 not supported");
}

TEST_F(WasmModuleVerifyTest, ExceptionSectionCorrectPlacement) {
  static const byte data[] = {SECTION(Memory, ENTRY_COUNT(0)),
                              SECTION(Exception, ENTRY_COUNT(0)),
                              SECTION(Global, ENTRY_COUNT(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, ExceptionSectionAfterGlobal) {
  static const byte data[] = {SECTION(Global, ENTRY_COUNT(0)),
                              SECTION(Exception, ENTRY_COUNT(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result,
                "The Exception section must appear before the Global section");
}

TEST_F(WasmModuleVerifyTest, ExceptionSectionBeforeMemory) {
  static const byte data[] = {SECTION(Exception, ENTRY_COUNT(0)),
                              SECTION(Memory, ENTRY_COUNT(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "unexpected section <Memory>");
}

TEST_F(WasmModuleVerifyTest, ExceptionSectionAfterTableBeforeMemory) {
  STATIC_ASSERT(kMemorySectionCode + 1 == kGlobalSectionCode);
  static const byte data[] = {SECTION(Table, ENTRY_COUNT(0)),
                              SECTION(Exception, ENTRY_COUNT(0)),
                              SECTION(Memory, ENTRY_COUNT(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "unexpected section <Memory>");
}

TEST_F(WasmModuleVerifyTest, ExceptionImport) {
  static const byte data[] = {
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      SECTION(Import,                           // section header
              ENTRY_COUNT(1),                   // number of imports
              ADD_COUNT('m'),                   // module name
              ADD_COUNT('e', 'x'),              // exception name
              kExternalException,               // import kind
              EXCEPTION_ENTRY(SIG_INDEX(0)))};  // except[0] (sig#0)
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(1u, result.value()->exceptions.size());
  EXPECT_EQ(1u, result.value()->import_table.size());
}

TEST_F(WasmModuleVerifyTest, ExceptionExport) {
  static const byte data[] = {
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      SECTION(Exception, ENTRY_COUNT(1),
              EXCEPTION_ENTRY(SIG_INDEX(0))),  // except[0] (sig#0)
      SECTION(Export, ENTRY_COUNT(1),          // --
              NO_NAME,                         // --
              kExternalException,              // --
              EXCEPTION_INDEX(0))};
  FAIL_IF_NO_EXPERIMENTAL_EH(data);

  WASM_FEATURE_SCOPE(eh);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(1u, result.value()->exceptions.size());
  EXPECT_EQ(1u, result.value()->export_table.size());
}

TEST_F(WasmModuleVerifyTest, OneSignature) {
  {
    static const byte data[] = {TYPE_SECTION_ONE_SIG_VOID_VOID};
    EXPECT_VERIFIES(data);
  }

  {
    static const byte data[] = {SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_i_i)};
    EXPECT_VERIFIES(data);
  }
}

TEST_F(WasmModuleVerifyTest, MultipleSignatures) {
  static const byte data[] = {
      SECTION(Type,                                           // --
              ENTRY_COUNT(3),                                 // --
              SIG_ENTRY_v_v,                                  // void -> void
              SIG_ENTRY_x_x(kI32Code, kF32Code),              // f32 -> i32
              SIG_ENTRY_x_xx(kI32Code, kF64Code, kF64Code)),  // f64,f64 -> i32
  };

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(3u, result.value()->types.size());
  if (result.value()->types.size() == 3) {
    EXPECT_EQ(0u, result.value()->signature(0)->return_count());
    EXPECT_EQ(1u, result.value()->signature(1)->return_count());
    EXPECT_EQ(1u, result.value()->signature(2)->return_count());

    EXPECT_EQ(0u, result.value()->signature(0)->parameter_count());
    EXPECT_EQ(1u, result.value()->signature(1)->parameter_count());
    EXPECT_EQ(2u, result.value()->signature(2)->parameter_count());
  }

  EXPECT_OFF_END_FAILURE(data, 1);
}

TEST_F(WasmModuleVerifyTest, CanonicalTypeIds) {
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  WASM_FEATURE_SCOPE(reftypes);

  static const byte data[] = {
      SECTION(Type,                               // --
              ENTRY_COUNT(5),                     // --
              WASM_STRUCT_DEF(                    // Struct definition
                  FIELD_COUNT(1),                 // --
                  STRUCT_FIELD(kI32Code, true)),  // --
              SIG_ENTRY_x_x(kI32Code, kF32Code),  // f32 -> i32
              SIG_ENTRY_x_x(kI32Code, kF64Code),  // f64 -> i32
              SIG_ENTRY_x_x(kI32Code, kF32Code),  // f32 -> i32 (again)
              WASM_ARRAY_DEF(kI32Code, true))     // Array definition
  };

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  const WasmModule* module = result.value().get();

  EXPECT_EQ(5u, module->types.size());
  EXPECT_EQ(5u, module->type_kinds.size());
  EXPECT_EQ(5u, module->canonicalized_type_ids.size());
  EXPECT_EQ(2u, module->signature_map.size());

  // No canonicalization for structs.
  EXPECT_EQ(0u, module->canonicalized_type_ids[0]);
  EXPECT_EQ(0u, module->canonicalized_type_ids[1]);
  EXPECT_EQ(1u, module->canonicalized_type_ids[2]);
  EXPECT_EQ(0u, module->canonicalized_type_ids[3]);
  // No canonicalization for arrays.
  EXPECT_EQ(0u, module->canonicalized_type_ids[4]);
}

TEST_F(WasmModuleVerifyTest, DataSegmentWithImmutableImportedGlobal) {
  // Import 2 globals so that we can initialize data with a global index != 0.
  const byte data[] = {
      SECTION(Import,           // section header
              ENTRY_COUNT(2),   // number of imports
              ADD_COUNT('m'),   // module name
              ADD_COUNT('f'),   // global name
              kExternalGlobal,  // import kind
              kI32Code,         // type
              0,                // mutability
              ADD_COUNT('n'),   // module name
              ADD_COUNT('g'),   // global name
              kExternalGlobal,  // import kind
              kI32Code,         // type
              0),               // mutability
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_GLOBAL(1),  // dest addr
              U32V_1(3),                 // source size
              'a', 'b', 'c')             // data bytes
  };
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  WasmInitExpr expr = std::move(result.value()->data_segments.back()).dest_addr;
  EXPECT_EQ(WasmInitExpr::kGlobalGet, expr.kind());
  EXPECT_EQ(1u, expr.immediate().index);
}

TEST_F(WasmModuleVerifyTest, DataSegmentWithMutableImportedGlobal) {
  // Only an immutable imported global can be used as an init_expr.
  const byte data[] = {
      SECTION(Import,           // section header
              ENTRY_COUNT(1),   // number of imports
              ADD_COUNT('m'),   // module name
              ADD_COUNT('f'),   // global name
              kExternalGlobal,  // import kind
              kI32Code,         // type
              1),               // mutability
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_GLOBAL(0),  // dest addr
              U32V_1(3),                 // source size
              'a', 'b', 'c')             // data bytes
  };
  EXPECT_FAILURE(data);
}
TEST_F(WasmModuleVerifyTest, DataSegmentWithImmutableGlobal) {
  // Only an immutable imported global can be used as an init_expr.
  const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Global, ENTRY_COUNT(1),
              kI32Code,                         // local type
              0,                                // immutable
              WASM_INIT_EXPR_I32V_3(0x9BBAA)),  // init
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_GLOBAL(0),  // dest addr
              U32V_1(3),                 // source size
              'a', 'b', 'c')             // data bytes
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, OneDataSegment) {
  const byte kDataSegmentSourceOffset = 24;
  const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_I32V_3(0x9BBAA),  // dest addr
              U32V_1(3),                       // source size
              'a', 'b', 'c')                   // data bytes
  };

  {
    EXPECT_VERIFIES(data);
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(0u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(1u, result.value()->data_segments.size());

    const WasmDataSegment* segment = &result.value()->data_segments.back();

    EXPECT_EQ(WasmInitExpr::kI32Const, segment->dest_addr.kind());
    EXPECT_EQ(0x9BBAA, segment->dest_addr.immediate().i32_const);
    EXPECT_EQ(kDataSegmentSourceOffset, segment->source.offset());
    EXPECT_EQ(3u, segment->source.length());
  }

  EXPECT_OFF_END_FAILURE(data, 14);
}

TEST_F(WasmModuleVerifyTest, TwoDataSegments) {
  const byte kDataSegment0SourceOffset = 24;
  const byte kDataSegment1SourceOffset = kDataSegment0SourceOffset + 11;

  const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data,
              ENTRY_COUNT(2),  // segment count
              LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_I32V_3(0x7FFEE),  // #0: dest addr
              U32V_1(4),                       // source size
              1, 2, 3, 4,                      // data bytes
              LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_I32V_3(0x6DDCC),  // #1: dest addr
              U32V_1(10),                      // source size
              1, 2, 3, 4, 5, 6, 7, 8, 9, 10)   // data bytes
  };

  {
    ModuleResult result = DecodeModule(data, data + sizeof(data));
    EXPECT_OK(result);
    EXPECT_EQ(0u, result.value()->globals.size());
    EXPECT_EQ(0u, result.value()->functions.size());
    EXPECT_EQ(2u, result.value()->data_segments.size());

    const WasmDataSegment* s0 = &result.value()->data_segments[0];
    const WasmDataSegment* s1 = &result.value()->data_segments[1];

    EXPECT_EQ(WasmInitExpr::kI32Const, s0->dest_addr.kind());
    EXPECT_EQ(0x7FFEE, s0->dest_addr.immediate().i32_const);
    EXPECT_EQ(kDataSegment0SourceOffset, s0->source.offset());
    EXPECT_EQ(4u, s0->source.length());

    EXPECT_EQ(WasmInitExpr::kI32Const, s1->dest_addr.kind());
    EXPECT_EQ(0x6DDCC, s1->dest_addr.immediate().i32_const);
    EXPECT_EQ(kDataSegment1SourceOffset, s1->source.offset());
    EXPECT_EQ(10u, s1->source.length());
  }

  EXPECT_OFF_END_FAILURE(data, 14);
}

TEST_F(WasmModuleVerifyTest, DataWithoutMemory) {
  const byte data[] = {
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_I32V_3(0x9BBAA),  // dest addr
              U32V_1(3),                       // source size
              'a', 'b', 'c')                   // data bytes
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, MaxMaximumMemorySize) {
  {
    const byte data[] = {
        SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 0, U32V_3(65536))};
    EXPECT_VERIFIES(data);
  }
  {
    const byte data[] = {
        SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 0, U32V_3(65537))};
    EXPECT_FAILURE(data);
  }
}

TEST_F(WasmModuleVerifyTest, InvalidMemoryLimits) {
  {
    const byte kInvalidLimits = 0x15;
    const byte data[] = {
        SECTION(Memory, ENTRY_COUNT(1), kInvalidLimits, 0, 10)};
    EXPECT_FAILURE_WITH_MSG(data, "invalid memory limits flags 0x15");
  }
}

TEST_F(WasmModuleVerifyTest, DataSegment_wrong_init_type) {
  const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,
              WASM_INIT_EXPR_F64(9.9),  // dest addr
              U32V_1(3),                // source size
              'a', 'b', 'c')            // data bytes
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, DataSegmentEndOverflow) {
  const byte data[] = {
      SECTION(Memory,  // memory section
              ENTRY_COUNT(1), kWithMaximum, 28, 28),
      SECTION(Data,                      // data section
              ENTRY_COUNT(1),            // one entry
              LINEAR_MEMORY_INDEX_0,     // mem index
              WASM_INIT_EXPR_I32V_1(0),  // offset
              U32V_5(0xFFFFFFFF))        // size
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, OneIndirectFunction) {
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  if (result.ok()) {
    EXPECT_EQ(1u, result.value()->types.size());
    EXPECT_EQ(1u, result.value()->functions.size());
    EXPECT_EQ(1u, result.value()->tables.size());
    EXPECT_EQ(1u, result.value()->tables[0].initial_size);
  }
}

TEST_F(WasmModuleVerifyTest, ElementSectionWithInternalTable) {
  static const byte data[] = {
      // table ---------------------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // elements ------------------------------------------------------------
      SECTION(Element, ENTRY_COUNT(0))};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionWithImportedTable) {
  static const byte data[] = {
      // imports -------------------------------------------------------------
      SECTION(Import, ENTRY_COUNT(1),
              ADD_COUNT('m'),  // module name
              ADD_COUNT('t'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              1),              // initial size
      // elements ------------------------------------------------------------
      SECTION(Element, ENTRY_COUNT(0))};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionWithoutTable) {
  // Test that an element section without a table causes a validation error.
  static const byte data[] = {
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(1),  // entry count
              0,               // table index
              0,               // offset
              0)               // number of elements
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, Regression_735887) {
  // Test with an invalid function index in the element section.
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(1),  // entry count
              TABLE_INDEX0, WASM_INIT_EXPR_I32V_1(0),
              1,     // elements count
              0x9A)  // invalid I32V as function index
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, OneIndirectFunction_one_entry) {
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(1),  // entry count
              TABLE_INDEX0, WASM_INIT_EXPR_I32V_1(0),
              1,  // elements count
              FUNC_INDEX(0)),
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(1u, result.value()->types.size());
  EXPECT_EQ(1u, result.value()->functions.size());
  EXPECT_EQ(1u, result.value()->tables.size());
  EXPECT_EQ(1u, result.value()->tables[0].initial_size);
}

TEST_F(WasmModuleVerifyTest, MultipleIndirectFunctions) {
  static const byte data[] = {
      // sig#0 -------------------------------------------------------
      SECTION(Type,
              ENTRY_COUNT(2),            // --
              SIG_ENTRY_v_v,             // void -> void
              SIG_ENTRY_v_x(kI32Code)),  // void -> i32
      // funcs ------------------------------------------------------
      FOUR_EMPTY_FUNCTIONS(SIG_INDEX(0)),
      // table declaration -------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 8),
      // table elements ----------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(1),  // entry count
              TABLE_INDEX0, WASM_INIT_EXPR_I32V_1(0),
              ADD_COUNT(FUNC_INDEX(0), FUNC_INDEX(1), FUNC_INDEX(2),
                        FUNC_INDEX(3), FUNC_INDEX(0), FUNC_INDEX(1),
                        FUNC_INDEX(2), FUNC_INDEX(3))),
      FOUR_EMPTY_BODIES};

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(2u, result.value()->types.size());
  EXPECT_EQ(4u, result.value()->functions.size());
  EXPECT_EQ(1u, result.value()->tables.size());
  EXPECT_EQ(8u, result.value()->tables[0].initial_size);
}

TEST_F(WasmModuleVerifyTest, ElementSectionMultipleTables) {
  // Test that if we have multiple tables, in the element section we can target
  // and initialize all tables.
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kFuncRefCode, 0, 5,     // table 0
              kFuncRefCode, 0, 9),    // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(2),            // entry count
              TABLE_INDEX0,              // element for table 0
              WASM_INIT_EXPR_I32V_1(0),  // index
              1,                         // elements count
              FUNC_INDEX(0),             // function
              TABLE_INDEX(1),            // element for table 1
              WASM_INIT_EXPR_I32V_1(7),  // index
              kExternalFunction,         // type
              2,                         // elements count
              FUNC_INDEX(0),             // entry 0
              FUNC_INDEX(0)),            // entry 1
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionMixedTables) {
  // Test that if we have multiple tables, both imported and module-defined, in
  // the element section we can target and initialize all tables.
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // imports -------------------------------------------------------------
      SECTION(Import, ENTRY_COUNT(2),
              ADD_COUNT('m'),  // module name
              ADD_COUNT('t'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              5,               // initial size
              ADD_COUNT('m'),  // module name
              ADD_COUNT('s'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              10),             // initial size
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kFuncRefCode, 0, 15,    // table 0
              kFuncRefCode, 0, 19),   // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              4,                          // entry count
              TABLE_INDEX0,               // element for table 0
              WASM_INIT_EXPR_I32V_1(0),   // index
              1,                          // elements count
              FUNC_INDEX(0),              // function
              TABLE_INDEX(1),             // element for table 1
              WASM_INIT_EXPR_I32V_1(7),   // index
              kExternalFunction,          // type
              2,                          // elements count
              FUNC_INDEX(0),              // entry 0
              FUNC_INDEX(0),              // entry 1
              TABLE_INDEX(2),             // element for table 2
              WASM_INIT_EXPR_I32V_1(12),  // index
              kExternalFunction,          // type
              1,                          // elements count
              FUNC_INDEX(0),              // function
              TABLE_INDEX(3),             // element for table 1
              WASM_INIT_EXPR_I32V_1(17),  // index
              kExternalFunction,          // type
              2,                          // elements count
              FUNC_INDEX(0),              // entry 0
              FUNC_INDEX(0)),             // entry 1
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionMultipleTablesArbitraryOrder) {
  // Test that the order in which tables are targeted in the element secion
  // can be arbitrary.
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kFuncRefCode, 0, 5,     // table 0
              kFuncRefCode, 0, 9),    // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(3),            // entry count
              TABLE_INDEX0,              // element for table 1
              WASM_INIT_EXPR_I32V_1(0),  // index
              1,                         // elements count
              FUNC_INDEX(0),             // function
              TABLE_INDEX(1),            // element for table 0
              WASM_INIT_EXPR_I32V_1(7),  // index
              kExternalFunction,         // type
              2,                         // elements count
              FUNC_INDEX(0),             // entry 0
              FUNC_INDEX(0),             // entry 1
              TABLE_INDEX0,              // element for table 1
              WASM_INIT_EXPR_I32V_1(3),  // index
              1,                         // elements count
              FUNC_INDEX(0)),            // function
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionMixedTablesArbitraryOrder) {
  // Test that the order in which tables are targeted in the element secion can
  // be arbitrary. In this test, tables can be both imported and module-defined.
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // imports -------------------------------------------------------------
      SECTION(Import, ENTRY_COUNT(2),
              ADD_COUNT('m'),  // module name
              ADD_COUNT('t'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              5,               // initial size
              ADD_COUNT('m'),  // module name
              ADD_COUNT('s'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              10),             // initial size
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kFuncRefCode, 0, 15,    // table 0
              kFuncRefCode, 0, 19),   // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              4,                          // entry count
              TABLE_INDEX(2),             // element for table 0
              WASM_INIT_EXPR_I32V_1(10),  // index
              kExternalFunction,          // type
              1,                          // elements count
              FUNC_INDEX(0),              // function
              TABLE_INDEX(3),             // element for table 1
              WASM_INIT_EXPR_I32V_1(17),  // index
              kExternalFunction,          // type
              2,                          // elements count
              FUNC_INDEX(0),              // entry 0
              FUNC_INDEX(0),              // entry 1
              TABLE_INDEX0,               // element for table 2
              WASM_INIT_EXPR_I32V_1(2),   // index
              1,                          // elements count
              FUNC_INDEX(0),              // function
              TABLE_INDEX(1),             // element for table 1
              WASM_INIT_EXPR_I32V_1(7),   // index
              kExternalFunction,          // type
              2,                          // elements count
              FUNC_INDEX(0),              // entry 0
              FUNC_INDEX(0)),             // entry 1
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY};

  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ElementSectionInitExternRefTableWithFuncRef) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kExternRefCode, 0, 5,   // table 0
              kFuncRefCode, 0, 9),    // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(2),            // entry count
              TABLE_INDEX0,              // element for table 0
              WASM_INIT_EXPR_I32V_1(0),  // index
              1,                         // elements count
              FUNC_INDEX(0),             // function
              TABLE_INDEX(1),            // element for table 1
              WASM_INIT_EXPR_I32V_1(7),  // index
              kExternalFunction,         // type
              2,                         // elements count
              FUNC_INDEX(0),             // entry 0
              FUNC_INDEX(0)),            // entry 1
      // code ----------------------------------------------------------------
      ONE_EMPTY_BODY,
  };

  EXPECT_FAILURE_WITH_MSG(
      data, "Invalid element segment. Table 0 is not a super-type of funcref");
}

TEST_F(WasmModuleVerifyTest, ElementSectionDontInitExternRefImportedTable) {
  // Test that imported tables of type ExternRef cannot be initialized in the
  // elements section.
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(bulk_memory);
  static const byte data[] = {
      // sig#0 ---------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // imports -------------------------------------------------------------
      SECTION(Import, ENTRY_COUNT(2),
              ADD_COUNT('m'),  // module name
              ADD_COUNT('t'),  // table name
              kExternalTable,  // import kind
              kFuncRefCode,    // elem_type
              0,               // no maximum field
              5,               // initial size
              ADD_COUNT('m'),  // module name
              ADD_COUNT('s'),  // table name
              kExternalTable,  // import kind
              kExternRefCode,  // elem_type
              0,               // no maximum field
              10),             // initial size
      // funcs ---------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration ---------------------------------------------------
      SECTION(Table, ENTRY_COUNT(2),  // section header
              kFuncRefCode, 0, 15,    // table 0
              kFuncRefCode, 0, 19),   // table 1
      // elements ------------------------------------------------------------
      SECTION(Element,
              ENTRY_COUNT(4),             // entry count
              TABLE_INDEX0,               // element for table 0
              WASM_INIT_EXPR_I32V_1(10),  // index
              1,                          // elements count
              FUNC_INDEX(0),              // function
              TABLE_INDEX(1),             // element for table 1
              WASM_INIT_EXPR_I32V_1(17),  // index
              kExternalFunction,          // type
              2,                          // elements count
              FUNC_INDEX(0),              // entry 0
              FUNC_INDEX(0)),             // entry 1
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, IndirectFunctionNoFunctions) {
  static const byte data[] = {
      // sig#0 -------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // indirect table ----------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), 1, 0, 0)};

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, IndirectFunctionInvalidIndex) {
  static const byte data[] = {
      // sig#0 -------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // functions ---------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // indirect table ----------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), 1, 1, 0)};

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, MultipleTablesWithoutFlag) {
  static const byte data[] = {
      SECTION(Table,           // table section
              ENTRY_COUNT(2),  // 2 tables
              kFuncRefCode,    // table 1: type
              0,               // table 1: no maximum
              10,              // table 1: minimum size
              kFuncRefCode,    // table 2: type
              0,               // table 2: no maximum
              10),             // table 2: minimum size
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, MultipleTablesWithFlag) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {
      SECTION(Table,           // table section
              ENTRY_COUNT(2),  // 2 tables
              kFuncRefCode,    // table 1: type
              0,               // table 1: no maximum
              10,              // table 1: minimum size
              kExternRefCode,  // table 2: type
              0,               // table 2: no maximum
              11),             // table 2: minimum size
  };

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(2u, result.value()->tables.size());

  EXPECT_EQ(10u, result.value()->tables[0].initial_size);
  EXPECT_EQ(kWasmFuncRef, result.value()->tables[0].type);

  EXPECT_EQ(11u, result.value()->tables[1].initial_size);
  EXPECT_EQ(kWasmExternRef, result.value()->tables[1].type);
}

TEST_F(WasmModuleVerifyTest, TypedFunctionTable) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);

  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1), SIG_ENTRY_v_x(kI32Code)),
      SECTION(Table,           // table section
              ENTRY_COUNT(1),  // 1 table
              kOptRefCode, 0,  // table 0: type
              0, 10)};         // table 0: limits

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
  EXPECT_EQ(ValueType::Ref(0, kNullable), result.value()->tables[0].type);
}

TEST_F(WasmModuleVerifyTest, IllegalTableTypes) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);

  using Vec = std::vector<byte>;

  static Vec table_types[] = {{kOptRefCode, 0},
                              {kOptRefCode, 1},
                              {kOptRefCode, kI31RefCode},
                              {kI31RefCode},
                              {kRttCode, 2, kFuncRefCode}};

  for (Vec type : table_types) {
    Vec data = {
        SECTION(Type, ENTRY_COUNT(2),
                WASM_STRUCT_DEF(FIELD_COUNT(1), STRUCT_FIELD(kI32Code, true)),
                WASM_ARRAY_DEF(kI32Code, true)),
        kTableSectionCode, static_cast<byte>(type.size() + 3), byte{1}};
    // Last elements are section size and entry count

    // Add table type
    data.insert(data.end(), type.begin(), type.end());
    // Add table limits
    data.insert(data.end(), {byte{0}, byte{10}});

    auto result = DecodeModule(data.data(), data.data() + data.size());

    EXPECT_NOT_OK(result,
                  "Currently, only nullable exnref, externref, and "
                  "function references are allowed as table types");
  }
}

TEST_F(WasmModuleVerifyTest, TieringCompilationHints) {
  WASM_FEATURE_SCOPE(compilation_hints);
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),
      FUNCTION_SECTION(3, 0, 0, 0),
      SECTION_COMPILATION_HINTS(BASELINE_TIER_BASELINE | TOP_TIER_BASELINE,
                                BASELINE_TIER_BASELINE | TOP_TIER_OPTIMIZED,
                                BASELINE_TIER_OPTIMIZED | TOP_TIER_OPTIMIZED),
      SECTION(Code, ENTRY_COUNT(3), NOP_BODY, NOP_BODY, NOP_BODY),
  };

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(3u, result.value()->compilation_hints.size());
  EXPECT_EQ(WasmCompilationHintStrategy::kDefault,
            result.value()->compilation_hints[0].strategy);
  EXPECT_EQ(WasmCompilationHintTier::kBaseline,
            result.value()->compilation_hints[0].baseline_tier);
  EXPECT_EQ(WasmCompilationHintTier::kBaseline,
            result.value()->compilation_hints[0].top_tier);
  EXPECT_EQ(WasmCompilationHintStrategy::kDefault,
            result.value()->compilation_hints[1].strategy);
  EXPECT_EQ(WasmCompilationHintTier::kBaseline,
            result.value()->compilation_hints[1].baseline_tier);
  EXPECT_EQ(WasmCompilationHintTier::kOptimized,
            result.value()->compilation_hints[1].top_tier);
  EXPECT_EQ(WasmCompilationHintStrategy::kDefault,
            result.value()->compilation_hints[2].strategy);
  EXPECT_EQ(WasmCompilationHintTier::kOptimized,
            result.value()->compilation_hints[2].baseline_tier);
  EXPECT_EQ(WasmCompilationHintTier::kOptimized,
            result.value()->compilation_hints[2].top_tier);
}

class WasmSignatureDecodeTest : public TestWithZone {
 public:
  WasmFeatures enabled_features_ = WasmFeatures::None();

  const FunctionSig* DecodeSig(const byte* start, const byte* end) {
    return DecodeWasmSignatureForTesting(enabled_features_, zone(), start, end);
  }
};

TEST_F(WasmSignatureDecodeTest, Ok_v_v) {
  static const byte data[] = {SIG_ENTRY_v_v};
  v8::internal::AccountingAllocator allocator;
  Zone zone(&allocator, ZONE_NAME);
  const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

  EXPECT_TRUE(sig != nullptr);
  EXPECT_EQ(0u, sig->parameter_count());
  EXPECT_EQ(0u, sig->return_count());
}

TEST_F(WasmSignatureDecodeTest, Ok_t_v) {
  WASM_FEATURE_SCOPE(reftypes);
  for (size_t i = 0; i < arraysize(kValueTypes); i++) {
    ValueTypePair ret_type = kValueTypes[i];
    const byte data[] = {SIG_ENTRY_x(ret_type.code)};
    const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

    EXPECT_TRUE(sig != nullptr);
    EXPECT_EQ(0u, sig->parameter_count());
    EXPECT_EQ(1u, sig->return_count());
    EXPECT_EQ(ret_type.type, sig->GetReturn());
  }
}

TEST_F(WasmSignatureDecodeTest, Ok_v_t) {
  WASM_FEATURE_SCOPE(reftypes);
  for (size_t i = 0; i < arraysize(kValueTypes); i++) {
    ValueTypePair param_type = kValueTypes[i];
    const byte data[] = {SIG_ENTRY_v_x(param_type.code)};
    const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

    EXPECT_TRUE(sig != nullptr);
    EXPECT_EQ(1u, sig->parameter_count());
    EXPECT_EQ(0u, sig->return_count());
    EXPECT_EQ(param_type.type, sig->GetParam(0));
  }
}

TEST_F(WasmSignatureDecodeTest, Ok_t_t) {
  WASM_FEATURE_SCOPE(reftypes);
  for (size_t i = 0; i < arraysize(kValueTypes); i++) {
    ValueTypePair ret_type = kValueTypes[i];
    for (size_t j = 0; j < arraysize(kValueTypes); j++) {
      ValueTypePair param_type = kValueTypes[j];
      const byte data[] = {SIG_ENTRY_x_x(ret_type.code, param_type.code)};
      const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

      EXPECT_TRUE(sig != nullptr);
      EXPECT_EQ(1u, sig->parameter_count());
      EXPECT_EQ(1u, sig->return_count());
      EXPECT_EQ(param_type.type, sig->GetParam(0));
      EXPECT_EQ(ret_type.type, sig->GetReturn());
    }
  }
}

TEST_F(WasmSignatureDecodeTest, Ok_i_tt) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(mv);
  for (size_t i = 0; i < arraysize(kValueTypes); i++) {
    ValueTypePair p0_type = kValueTypes[i];
    for (size_t j = 0; j < arraysize(kValueTypes); j++) {
      ValueTypePair p1_type = kValueTypes[j];
      const byte data[] = {
          SIG_ENTRY_x_xx(kI32Code, p0_type.code, p1_type.code)};
      const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

      EXPECT_TRUE(sig != nullptr);
      EXPECT_EQ(2u, sig->parameter_count());
      EXPECT_EQ(1u, sig->return_count());
      EXPECT_EQ(p0_type.type, sig->GetParam(0));
      EXPECT_EQ(p1_type.type, sig->GetParam(1));
    }
  }
}

TEST_F(WasmSignatureDecodeTest, Ok_tt_tt) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(mv);
  for (size_t i = 0; i < arraysize(kValueTypes); i++) {
    ValueTypePair p0_type = kValueTypes[i];
    for (size_t j = 0; j < arraysize(kValueTypes); j++) {
      ValueTypePair p1_type = kValueTypes[j];
      const byte data[] = {SIG_ENTRY_xx_xx(p0_type.code, p1_type.code,
                                           p0_type.code, p1_type.code)};
      const FunctionSig* sig = DecodeSig(data, data + sizeof(data));

      EXPECT_TRUE(sig != nullptr);
      EXPECT_EQ(2u, sig->parameter_count());
      EXPECT_EQ(2u, sig->return_count());
      EXPECT_EQ(p0_type.type, sig->GetParam(0));
      EXPECT_EQ(p1_type.type, sig->GetParam(1));
      EXPECT_EQ(p0_type.type, sig->GetReturn(0));
      EXPECT_EQ(p1_type.type, sig->GetReturn(1));
    }
  }
}

TEST_F(WasmSignatureDecodeTest, TooManyParams) {
  static const byte data[] = {kWasmFunctionTypeCode,
                              WASM_I32V_3(kV8MaxWasmFunctionParams + 1),
                              kI32Code, 0};
  const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
  EXPECT_FALSE(sig != nullptr);
}

TEST_F(WasmSignatureDecodeTest, TooManyReturns) {
  for (int i = 0; i < 2; i++) {
    bool enable_mv = i != 0;
    WASM_FEATURE_SCOPE_VAL(mv, enable_mv);
    const int max_return_count = static_cast<int>(
        enable_mv ? kV8MaxWasmFunctionMultiReturns : kV8MaxWasmFunctionReturns);
    byte data[] = {kWasmFunctionTypeCode, 0, WASM_I32V_3(max_return_count + 1),
                   kI32Code};
    const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
    EXPECT_EQ(nullptr, sig);
  }
}

TEST_F(WasmSignatureDecodeTest, Fail_off_end) {
  byte data[256];
  for (int p = 0; p <= 255; p = p + 1 + p * 3) {
    for (int i = 0; i <= p; i++) data[i] = kI32Code;
    data[0] = static_cast<byte>(p);

    for (int i = 0; i < p + 1; i++) {
      // Should fall off the end for all signatures.
      const FunctionSig* sig = DecodeSig(data, data + i);
      EXPECT_EQ(nullptr, sig);
    }
  }
}

TEST_F(WasmSignatureDecodeTest, Fail_externref_without_flag) {
  // Disable ExternRef support and check that decoding fails.
  WASM_FEATURE_SCOPE_VAL(reftypes, false);
  byte ref_types[] = {kFuncRefCode, kExternRefCode};
  for (byte invalid_type : ref_types) {
    for (size_t i = 0;; i++) {
      byte data[] = {SIG_ENTRY_x_xx(kI32Code, kI32Code, kI32Code)};
      if (i >= arraysize(data)) break;
      data[i] = invalid_type;
      const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
      EXPECT_EQ(nullptr, sig);
    }
  }
}

TEST_F(WasmSignatureDecodeTest, Fail_invalid_type) {
  byte kInvalidType = 76;
  for (size_t i = 0;; i++) {
    byte data[] = {SIG_ENTRY_x_xx(kI32Code, kI32Code, kI32Code)};
    if (i >= arraysize(data)) break;
    data[i] = kInvalidType;
    const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
    EXPECT_EQ(nullptr, sig);
  }
}

TEST_F(WasmSignatureDecodeTest, Fail_invalid_ret_type1) {
  static const byte data[] = {SIG_ENTRY_x_x(kVoidCode, kI32Code)};
  const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
  EXPECT_EQ(nullptr, sig);
}

TEST_F(WasmSignatureDecodeTest, Fail_invalid_param_type1) {
  static const byte data[] = {SIG_ENTRY_x_x(kI32Code, kVoidCode)};
  const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
  EXPECT_EQ(nullptr, sig);
}

TEST_F(WasmSignatureDecodeTest, Fail_invalid_param_type2) {
  static const byte data[] = {SIG_ENTRY_x_xx(kI32Code, kI32Code, kVoidCode)};
  const FunctionSig* sig = DecodeSig(data, data + sizeof(data));
  EXPECT_EQ(nullptr, sig);
}

class WasmFunctionVerifyTest : public TestWithIsolateAndZone {
 public:
  FunctionResult DecodeWasmFunction(const ModuleWireBytes& wire_bytes,
                                    const WasmModule* module,
                                    const byte* function_start,
                                    const byte* function_end) {
    WasmFeatures enabled_features;
    return DecodeWasmFunctionForTesting(enabled_features, zone(), wire_bytes,
                                        module, function_start, function_end,
                                        isolate()->counters());
  }
};

TEST_F(WasmFunctionVerifyTest, Ok_v_v_empty) {
  static const byte data[] = {
      SIG_ENTRY_v_v,  // signature entry
      4,              // locals
      3,
      kI32Code,  // --
      4,
      kI64Code,  // --
      5,
      kF32Code,  // --
      6,
      kF64Code,  // --
      kExprEnd   // body
  };

  WasmModule module;
  FunctionResult result = DecodeWasmFunction(ModuleWireBytes({}), &module, data,
                                             data + sizeof(data));
  EXPECT_OK(result);

  if (result.value() && result.ok()) {
    WasmFunction* function = result.value().get();
    EXPECT_EQ(0u, function->sig->parameter_count());
    EXPECT_EQ(0u, function->sig->return_count());
    EXPECT_EQ(COUNT_ARGS(SIG_ENTRY_v_v), function->code.offset());
    EXPECT_EQ(sizeof(data), function->code.end_offset());
    // TODO(titzer): verify encoding of local declarations
  }
}

TEST_F(WasmModuleVerifyTest, SectionWithoutNameLength) {
  const byte data[] = {1};
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, EmptyCustomSectionIsInvalid) {
  // An empty custom section is invalid, because at least one byte for the
  // length of the custom section name is required.
  const byte data[] = {
      0,  // unknown section code.
      0   // section length.
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, TheLoneliestOfValidModulesTheTrulyEmptyOne) {
  const byte data[] = {
      0,  // unknown section code.
      1,  // section length, only one byte for the name length.
      0,  // string length of 0.
          // Empty section name, no content, nothing but sadness.
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, OnlyUnknownSectionEmpty) {
  const byte data[] = {
      UNKNOWN_SECTION(0),
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, OnlyUnknownSectionNonEmpty) {
  const byte data[] = {
      UNKNOWN_SECTION(5),
      0xFF,
      0xFF,
      0xFF,
      0xFF,
      0xFF,  // section data
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, SignatureFollowedByEmptyUnknownSection) {
  const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // -----------------------------------------------------------
      UNKNOWN_SECTION(0)};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, SignatureFollowedByUnknownSection) {
  const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // -----------------------------------------------------------
      UNKNOWN_SECTION(5),
      0xFF,
      0xFF,
      0xFF,
      0xFF,
      0xFF,
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, UnknownSectionOverflow) {
  static const byte data[] = {
      UNKNOWN_SECTION(9),
      1,
      2,
      3,
      4,
      5,
      6,
      7,
      8,
      9,
      10,  // 10 byte section
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, UnknownSectionUnderflow) {
  static const byte data[] = {
      UNKNOWN_SECTION(333),
      1,
      2,
      3,
      4,  // 4 byte section
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, UnknownSectionSkipped) {
  static const byte data[] = {
      UNKNOWN_SECTION(1),
      0,  // one byte section
      SECTION(Global, ENTRY_COUNT(1),
              kI32Code,                    // memory type
              0,                           // exported
              WASM_INIT_EXPR_I32V_1(33)),  // init
  };
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(1u, result.value()->globals.size());
  EXPECT_EQ(0u, result.value()->functions.size());
  EXPECT_EQ(0u, result.value()->data_segments.size());

  const WasmGlobal* global = &result.value()->globals.back();

  EXPECT_EQ(kWasmI32, global->type);
  EXPECT_EQ(0u, global->offset);
}

TEST_F(WasmModuleVerifyTest, ImportTable_empty) {
  static const byte data[] = {SECTION(Type, ENTRY_COUNT(0)),
                              SECTION(Import, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_nosigs1) {
  static const byte data[] = {SECTION(Import, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_mutable_global) {
  {
    static const byte data[] = {
        SECTION(Import,           // section header
                ENTRY_COUNT(1),   // number of imports
                ADD_COUNT('m'),   // module name
                ADD_COUNT('f'),   // global name
                kExternalGlobal,  // import kind
                kI32Code,         // type
                0),               // mutability
    };
    EXPECT_VERIFIES(data);
  }
  {
    static const byte data[] = {
        SECTION(Import,           // section header
                ENTRY_COUNT(1),   // sig table
                ADD_COUNT('m'),   // module name
                ADD_COUNT('f'),   // global name
                kExternalGlobal,  // import kind
                kI32Code,         // type
                1),               // mutability
    };
    EXPECT_VERIFIES(data);
  }
}

TEST_F(WasmModuleVerifyTest, ImportTable_mutability_malformed) {
  static const byte data[] = {
      SECTION(Import,
              ENTRY_COUNT(1),   // --
              ADD_COUNT('m'),   // module name
              ADD_COUNT('g'),   // global name
              kExternalGlobal,  // import kind
              kI32Code,         // type
              2),               // invalid mutability
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_nosigs2) {
  static const byte data[] = {
      SECTION(Import, ENTRY_COUNT(1),  // sig table
              ADD_COUNT('m'),          // module name
              ADD_COUNT('f'),          // function name
              kExternalFunction,       // import kind
              SIG_INDEX(0)),           // sig index
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_invalid_sig) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(0)),   // --
      SECTION(Import, ENTRY_COUNT(1),  // --
              ADD_COUNT('m'),          // module name
              ADD_COUNT('f'),          // function name
              kExternalFunction,       // import kind
              SIG_INDEX(0)),           // sig index
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_one_sig) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      SECTION(Import,
              ENTRY_COUNT(1),     // --
              ADD_COUNT('m'),     // module name
              ADD_COUNT('f'),     // function name
              kExternalFunction,  // import kind
              SIG_INDEX(0)),      // sig index
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_invalid_module) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID,  // --
      SECTION(Import,                  // --
              ENTRY_COUNT(1),          // --
              NO_NAME,                 // module name
              ADD_COUNT('f'),          // function name
              kExternalFunction,       // import kind
              SIG_INDEX(0),            // sig index
              0),                      // auxiliary data
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ImportTable_off_end) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      SECTION(Import, ENTRY_COUNT(1),
              ADD_COUNT('m'),      // module name
              ADD_COUNT('f'),      // function name
              kExternalFunction),  // import kind
      SIG_INDEX(0),                // sig index (outside import section!)
  };

  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 3);
}

TEST_F(WasmModuleVerifyTest, ExportTable_empty1) {
  static const byte data[] = {                                 // signatures
                              TYPE_SECTION_ONE_SIG_VOID_VOID,  // --
                              ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
                              SECTION(Export, ENTRY_COUNT(0)),  // --
                              ONE_EMPTY_BODY};

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(1u, result.value()->functions.size());
  EXPECT_EQ(0u, result.value()->export_table.size());
}

TEST_F(WasmModuleVerifyTest, ExportTable_empty2) {
  static const byte data[] = {SECTION(Type, ENTRY_COUNT(0)),
                              SECTION(Export, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ExportTable_NoFunctions2) {
  static const byte data[] = {SECTION(Export, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, ExportTableOne) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID, ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      SECTION(Export,
              ENTRY_COUNT(1),     // exports
              NO_NAME,            // --
              kExternalFunction,  // --
              FUNC_INDEX(0)),     // --
      ONE_EMPTY_BODY};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(1u, result.value()->functions.size());
  EXPECT_EQ(1u, result.value()->export_table.size());
}

TEST_F(WasmModuleVerifyTest, ExportNameWithInvalidStringLength) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID, ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      SECTION(Export,
              ENTRY_COUNT(1),     // exports
              U32V_1(84),         // invalid string length
              'e',                // --
              kExternalFunction,  // --
              FUNC_INDEX(0),      // --
              0, 0, 0)            // auxiliary data
  };

  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, ExportTableTwo) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID, ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      SECTION(Export,
              ENTRY_COUNT(2),                 // exports
              ADD_COUNT('n', 'a', 'm', 'e'),  // --
              kExternalFunction,              // --
              FUNC_INDEX(0),                  // --
              ADD_COUNT('n', 'o', 'm'),       // --
              kExternalFunction,              // --
              FUNC_INDEX(0)),                 // --
      ONE_EMPTY_BODY};

  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(1u, result.value()->functions.size());
  EXPECT_EQ(2u, result.value()->export_table.size());
}

TEST_F(WasmModuleVerifyTest, ExportTableThree) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID, THREE_EMPTY_FUNCTIONS(SIG_INDEX(0)),
      SECTION(Export,
              ENTRY_COUNT(3),  // exports
              ADD_COUNT('a'),  // --
              kExternalFunction,
              FUNC_INDEX(0),   // --
              ADD_COUNT('b'),  // --
              kExternalFunction,
              FUNC_INDEX(1),   // --
              ADD_COUNT('c'),  // --
              kExternalFunction,
              FUNC_INDEX(2)),  // --
      THREE_EMPTY_BODIES};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);

  EXPECT_EQ(3u, result.value()->functions.size());
  EXPECT_EQ(3u, result.value()->export_table.size());
}

TEST_F(WasmModuleVerifyTest, ExportTableThreeOne) {
  for (int i = 0; i < 6; i++) {
    const byte data[] = {
        // signatures
        TYPE_SECTION_ONE_SIG_VOID_VOID, THREE_EMPTY_FUNCTIONS(SIG_INDEX(0)),
        SECTION(Export,
                ENTRY_COUNT(1),       // exports
                ADD_COUNT('e', 'x'),  // --
                kExternalFunction,
                FUNC_INDEX(i)),  // --
        THREE_EMPTY_BODIES};

    if (i < 3) {
      EXPECT_VERIFIES(data);
    } else {
      EXPECT_FAILURE(data);
    }
  }
}

TEST_F(WasmModuleVerifyTest, ExportTableOne_off_end) {
  static const byte data[] = {
      // signatures
      TYPE_SECTION_ONE_SIG_VOID_VOID, ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      SECTION(Export,
              ENTRY_COUNT(1),  // exports
              NO_NAME,         // --
              kExternalFunction,
              FUNC_INDEX(0),  // --
              0, 0, 0)        // auxiliary data
  };

  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 3);
}

TEST_F(WasmModuleVerifyTest, Regression_648070) {
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(0)),         // --
      SECTION(Function, U32V_5(3500228624))  // function count = 3500228624
  };                                         // --
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, Regression_738097) {
  // The function body size caused an integer overflow in the module decoder.
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),  // --
      FUNCTION_SECTION(1, 0),          // --
      SECTION(Code,                    // --
              ENTRY_COUNT(1),          // --
              U32V_5(0xFFFFFFFF),      // function size,
              0)                       // No real body
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, FunctionBodySizeLimit) {
  const uint32_t delta = 3;
  for (uint32_t body_size = kV8MaxWasmFunctionSize - delta;
       body_size < kV8MaxWasmFunctionSize + delta; body_size++) {
    byte data[] = {
        TYPE_SECTION(1, SIG_ENTRY_v_v),  // --
        FUNCTION_SECTION(1, 0),          // --
        kCodeSectionCode,                // code section
        U32V_5(1 + body_size + 5),       // section size
        1,                               // # functions
        U32V_5(body_size)                // body size
    };
    size_t total = sizeof(data) + body_size;
    byte* buffer = reinterpret_cast<byte*>(calloc(1, total));
    memcpy(buffer, data, sizeof(data));
    ModuleResult result = DecodeModule(buffer, buffer + total);
    if (body_size <= kV8MaxWasmFunctionSize) {
      EXPECT_TRUE(result.ok());
    } else {
      EXPECT_FALSE(result.ok());
    }
    free(buffer);
  }
}

TEST_F(WasmModuleVerifyTest, IllegalTypeCode) {
  static const byte data[] = {TYPE_SECTION(1, SIG_ENTRY_v_x(0x41))};
  EXPECT_FAILURE_WITH_MSG(data, "invalid value type");
}

TEST_F(WasmModuleVerifyTest, FunctionBodies_empty) {
  static const byte data[] = {
      EMPTY_TYPE_SECTION,            // --
      EMPTY_FUNCTION_SECTION,        // --
      EMPTY_FUNCTION_BODIES_SECTION  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, FunctionBodies_one_empty) {
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),  // --
      FUNCTION_SECTION(1, 0),          // --
      ONE_EMPTY_BODY                   // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, FunctionBodies_one_nop) {
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),          // --
      FUNCTION_SECTION(1, 0),                  // --
      SECTION(Code, ENTRY_COUNT(1), NOP_BODY)  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, FunctionBodies_count_mismatch1) {
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),  // --
      FUNCTION_SECTION(2, 0, 0),       // --
      ONE_EMPTY_BODY                   // --
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, FunctionBodies_count_mismatch2) {
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),                    // --
      FUNCTION_SECTION(1, 0),                            // --
      SECTION(Code, ENTRY_COUNT(2), NOP_BODY, NOP_BODY)  // --
  };
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, Names_empty) {
  static const byte data[] = {EMPTY_TYPE_SECTION, EMPTY_FUNCTION_SECTION,
                              EMPTY_FUNCTION_BODIES_SECTION,
                              EMPTY_NAMES_SECTION};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, Names_one_empty) {
  // TODO(wasm): This test does not test anything (corrupt name section does not
  // fail validation).
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),                            // --
      FUNCTION_SECTION(1, 0),                                    // --
      ONE_EMPTY_BODY,                                            // --
      SECTION_NAMES(ENTRY_COUNT(1), FOO_STRING, NO_LOCAL_NAMES)  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, Names_two_empty) {
  // TODO(wasm): This test does not test anything (corrupt name section does not
  // fail validation).
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),             // --
      FUNCTION_SECTION(2, 0, 0),                  // --
      TWO_EMPTY_BODIES,                           // --
      SECTION_NAMES(ENTRY_COUNT(2),               // --
                    FOO_STRING, NO_LOCAL_NAMES,   // --
                    FOO_STRING, NO_LOCAL_NAMES),  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, Regression684855) {
  static const byte data[] = {
      SECTION_NAMES(0xFB,  // functions count
                    0x27,  // |
                    0x00,  // function name length
                    0xFF,  // local names count
                    0xFF,  // |
                    0xFF,  // |
                    0xFF,  // |
                    0xFF,  // |
                    0xFF,  // error: "varint too large"
                    0xFF,  // |
                    0x00,  // --
                    0x00)  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, FunctionSectionWithoutCodeSection) {
  static const byte data[] = {
      TYPE_SECTION(1, SIG_ENTRY_v_v),  // Type section.
      FUNCTION_SECTION(1, 0),          // Function section.
  };
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "function count is 1, but code section is absent");
}

TEST_F(WasmModuleVerifyTest, CodeSectionWithoutFunctionSection) {
  static const byte data[] = {ONE_EMPTY_BODY};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "function body count 1 mismatch (0 expected)");
}

TEST_F(WasmModuleVerifyTest, EmptyFunctionSectionWithoutCodeSection) {
  static const byte data[] = {SECTION(Function, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, EmptyCodeSectionWithoutFunctionSection) {
  static const byte data[] = {SECTION(Code, ENTRY_COUNT(0))};
  EXPECT_VERIFIES(data);
}

class WasmInitExprDecodeTest : public TestWithZone {
 public:
  WasmInitExprDecodeTest() = default;

  WasmFeatures enabled_features_;

  WasmInitExpr DecodeInitExpr(const byte* start, const byte* end) {
    return DecodeWasmInitExprForTesting(enabled_features_, start, end);
  }
};

#define EXPECT_INIT_EXPR(Type, type, value, ...)                   \
  {                                                                \
    static const byte data[] = {__VA_ARGS__, kExprEnd};            \
    WasmInitExpr expr = DecodeInitExpr(data, data + sizeof(data)); \
    EXPECT_EQ(WasmInitExpr::k##Type##Const, expr.kind());          \
    EXPECT_EQ(value, expr.immediate().type##_const);               \
  }

#define EXPECT_INIT_EXPR_FAIL(...)                                 \
  {                                                                \
    static const byte data[] = {__VA_ARGS__, kExprEnd};            \
    WasmInitExpr expr = DecodeInitExpr(data, data + sizeof(data)); \
    EXPECT_EQ(WasmInitExpr::kNone, expr.kind());                   \
  }

TEST_F(WasmInitExprDecodeTest, InitExpr_i32) {
  EXPECT_INIT_EXPR(I32, i32, 33, WASM_I32V_1(33));
  EXPECT_INIT_EXPR(I32, i32, -21, WASM_I32V_1(-21));
  EXPECT_INIT_EXPR(I32, i32, 437, WASM_I32V_2(437));
  EXPECT_INIT_EXPR(I32, i32, 77777, WASM_I32V_3(77777));
}

TEST_F(WasmInitExprDecodeTest, InitExpr_f32) {
  EXPECT_INIT_EXPR(F32, f32, static_cast<float>(13.1), WASM_F32(13.1));
  EXPECT_INIT_EXPR(F32, f32, static_cast<float>(-21.1), WASM_F32(-21.1));
  EXPECT_INIT_EXPR(F32, f32, static_cast<float>(437.2), WASM_F32(437.2));
  EXPECT_INIT_EXPR(F32, f32, static_cast<float>(77777.3), WASM_F32(77777.3));
}

TEST_F(WasmInitExprDecodeTest, InitExpr_i64) {
  EXPECT_INIT_EXPR(I64, i64, 33, WASM_I64V_1(33));
  EXPECT_INIT_EXPR(I64, i64, -21, WASM_I64V_2(-21));
  EXPECT_INIT_EXPR(I64, i64, 437, WASM_I64V_5(437));
  EXPECT_INIT_EXPR(I64, i64, 77777, WASM_I64V_7(77777));
}

TEST_F(WasmInitExprDecodeTest, InitExpr_f64) {
  EXPECT_INIT_EXPR(F64, f64, 83.22, WASM_F64(83.22));
  EXPECT_INIT_EXPR(F64, f64, -771.3, WASM_F64(-771.3));
  EXPECT_INIT_EXPR(F64, f64, 43703.0, WASM_F64(43703.0));
  EXPECT_INIT_EXPR(F64, f64, 77999.1, WASM_F64(77999.1));
}

TEST_F(WasmInitExprDecodeTest, InitExpr_ExternRef) {
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {kExprRefNull, kExternRefCode, kExprEnd};
  WasmInitExpr expr = DecodeInitExpr(data, data + sizeof(data));
  EXPECT_EQ(WasmInitExpr::kRefNullConst, expr.kind());
}

TEST_F(WasmInitExprDecodeTest, InitExpr_illegal) {
  EXPECT_INIT_EXPR_FAIL(WASM_I32V_1(0), WASM_I32V_1(0));
  EXPECT_INIT_EXPR_FAIL(WASM_GET_LOCAL(0));
  EXPECT_INIT_EXPR_FAIL(WASM_SET_LOCAL(0, WASM_I32V_1(0)));
  EXPECT_INIT_EXPR_FAIL(WASM_I32_ADD(WASM_I32V_1(0), WASM_I32V_1(0)));
  EXPECT_INIT_EXPR_FAIL(WASM_IF_ELSE(WASM_ZERO, WASM_ZERO, WASM_ZERO));
}

TEST_F(WasmModuleVerifyTest, Multiple_Named_Sections) {
  static const byte data[] = {
      SECTION(Unknown, ADD_COUNT('X'), 17, 18),                    // --
      SECTION(Unknown, ADD_COUNT('f', 'o', 'o'), 5, 6, 7, 8, 9),   // --
      SECTION(Unknown, ADD_COUNT('o', 't', 'h', 'e', 'r'), 7, 8),  // --
  };
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, Section_Name_No_UTF8) {
  static const byte data[] = {SECTION(Unknown, 1, 0xFF, 17, 18)};
  EXPECT_FAILURE(data);
}

class WasmModuleCustomSectionTest : public TestWithIsolateAndZone {
 public:
  void CheckSections(const byte* module_start, const byte* module_end,
                     const CustomSectionOffset* expected, size_t num_expected) {
    std::vector<CustomSectionOffset> custom_sections =
        DecodeCustomSections(module_start, module_end);

    CHECK_EQ(num_expected, custom_sections.size());

    for (size_t i = 0; i < num_expected; i++) {
      EXPECT_EQ(expected[i].section.offset(),
                custom_sections[i].section.offset());
      EXPECT_EQ(expected[i].section.length(),
                custom_sections[i].section.length());
      EXPECT_EQ(expected[i].name.offset(), custom_sections[i].name.offset());
      EXPECT_EQ(expected[i].name.length(), custom_sections[i].name.length());
      EXPECT_EQ(expected[i].payload.offset(),
                custom_sections[i].payload.offset());
      EXPECT_EQ(expected[i].payload.length(),
                custom_sections[i].payload.length());
    }
  }
};

TEST_F(WasmModuleCustomSectionTest, ThreeUnknownSections) {
  static constexpr byte data[] = {
      U32_LE(kWasmMagic),                                  // --
      U32_LE(kWasmVersion),                                // --
      SECTION(Unknown, 1, 'X', 17, 18),                    // --
      SECTION(Unknown, 3, 'f', 'o', 'o', 5, 6, 7, 8, 9),   // --
      SECTION(Unknown, 5, 'o', 't', 'h', 'e', 'r', 7, 8),  // --
  };

  static const CustomSectionOffset expected[] = {
      // section, name, payload
      {{10, 4}, {11, 1}, {12, 2}},  // --
      {{16, 9}, {17, 3}, {20, 5}},  // --
      {{27, 8}, {28, 5}, {33, 2}},  // --
  };

  CheckSections(data, data + sizeof(data), expected, arraysize(expected));
}

TEST_F(WasmModuleCustomSectionTest, TwoKnownTwoUnknownSections) {
  static const byte data[] = {
      U32_LE(kWasmMagic),                                          // --
      U32_LE(kWasmVersion),                                        // --
      TYPE_SECTION(2, SIG_ENTRY_v_v, SIG_ENTRY_v_v),               // --
      SECTION(Unknown, ADD_COUNT('X'), 17, 18),                    // --
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),                            // --
      SECTION(Unknown, ADD_COUNT('o', 't', 'h', 'e', 'r'), 7, 8),  // --
  };

  static const CustomSectionOffset expected[] = {
      // section, name, payload
      {{19, 4}, {20, 1}, {21, 2}},  // --
      {{29, 8}, {30, 5}, {35, 2}},  // --
  };

  CheckSections(data, data + sizeof(data), expected, arraysize(expected));
}

TEST_F(WasmModuleVerifyTest, SourceMappingURLSection) {
  static const byte data[] = {
      WASM_MODULE_HEADER,
      SECTION_SRC_MAP('s', 'r', 'c', '/', 'x', 'y', 'z', '.', 'c')};
  ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
  EXPECT_TRUE(result.ok());
  EXPECT_EQ(WasmDebugSymbols::Type::SourceMap,
            result.value()->debug_symbols.type);
  ModuleWireBytes wire_bytes(data, data + sizeof(data));
  WasmName external_url =
      wire_bytes.GetNameOrNull(result.value()->debug_symbols.external_url);
  EXPECT_EQ("src/xyz.c", std::string(external_url.data(), external_url.size()));
}

TEST_F(WasmModuleVerifyTest, BadSourceMappingURLSection) {
  static const byte data[] = {
      WASM_MODULE_HEADER,
      SECTION_SRC_MAP('s', 'r', 'c', '/', 'x', 0xff, 'z', '.', 'c')};
  ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
  EXPECT_TRUE(result.ok());
  EXPECT_EQ(WasmDebugSymbols::Type::None, result.value()->debug_symbols.type);
  EXPECT_EQ(0u, result.value()->debug_symbols.external_url.length());
}

TEST_F(WasmModuleVerifyTest, MultipleSourceMappingURLSections) {
  static const byte data[] = {WASM_MODULE_HEADER,
                              SECTION_SRC_MAP('a', 'b', 'c'),
                              SECTION_SRC_MAP('p', 'q', 'r')};
  ModuleResult result = DecodeModuleNoHeader(data, data + sizeof(data));
  EXPECT_TRUE(result.ok());
  EXPECT_EQ(WasmDebugSymbols::Type::SourceMap,
            result.value()->debug_symbols.type);
  ModuleWireBytes wire_bytes(data, data + sizeof(data));
  WasmName external_url =
      wire_bytes.GetNameOrNull(result.value()->debug_symbols.external_url);
  EXPECT_EQ("abc", std::string(external_url.data(), external_url.size()));
}

TEST_F(WasmModuleVerifyTest, MultipleNameSections) {
  static const byte data[] = {
      SECTION_NAMES(0, ADD_COUNT(ADD_COUNT('a', 'b', 'c'))),
      SECTION_NAMES(0, ADD_COUNT(ADD_COUNT('p', 'q', 'r', 's')))};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_TRUE(result.ok());
  EXPECT_EQ(3u, result.value()->name.length());
}

TEST_F(WasmModuleVerifyTest, BadNameSection) {
  static const byte data[] = {SECTION_NAMES(
      0, ADD_COUNT(ADD_COUNT('s', 'r', 'c', '/', 'x', 0xff, 'z', '.', 'c')))};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_TRUE(result.ok());
  EXPECT_EQ(0u, result.value()->name.length());
}

TEST_F(WasmModuleVerifyTest, PassiveDataSegment) {
  static const byte data[] = {
      // memory declaration ----------------------------------------------------
      SECTION(Memory, ENTRY_COUNT(1), 0, 1),
      // data segments  --------------------------------------------------------
      SECTION(Data, ENTRY_COUNT(1), PASSIVE, ADD_COUNT('h', 'i')),
  };
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 5);
}

TEST_F(WasmModuleVerifyTest, ActiveElementSegmentWithElements) {
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration -----------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // element segments  -----------------------------------------------------
      SECTION(Element, ENTRY_COUNT(1), ACTIVE_WITH_ELEMENTS, TABLE_INDEX0,
              WASM_INIT_EXPR_I32V_1(0), kFuncRefCode, U32V_1(3),
              REF_FUNC_ELEMENT(0), REF_FUNC_ELEMENT(0), REF_NULL_ELEMENT),
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 5);
}

TEST_F(WasmModuleVerifyTest, PassiveElementSegment) {
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration -----------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // element segments  -----------------------------------------------------
      SECTION(Element, ENTRY_COUNT(1), PASSIVE_WITH_ELEMENTS, kFuncRefCode,
              U32V_1(3), REF_FUNC_ELEMENT(0), REF_FUNC_ELEMENT(0),
              REF_NULL_ELEMENT),
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 5);
}

TEST_F(WasmModuleVerifyTest, PassiveElementSegmentExternRef) {
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration -----------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // element segments  -----------------------------------------------------
      SECTION(Element, ENTRY_COUNT(1), PASSIVE_WITH_ELEMENTS, kExternRefCode,
              U32V_1(0)),
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_FAILURE(data);
}

TEST_F(WasmModuleVerifyTest, PassiveElementSegmentWithIndices) {
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // table declaration -----------------------------------------------------
      SECTION(Table, ENTRY_COUNT(1), kFuncRefCode, 0, 1),
      // element segments ------------------------------------------------------
      SECTION(Element, ENTRY_COUNT(1), PASSIVE, kExternalFunction,
              ENTRY_COUNT(3), U32V_1(0), U32V_1(0), U32V_1(0)),
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
  EXPECT_OFF_END_FAILURE(data, arraysize(data) - 5);
}

TEST_F(WasmModuleVerifyTest, DeclarativeElementSegmentFuncRef) {
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // element segments  -----------------------------------------------------
      SECTION(Element,                    // section name
              ENTRY_COUNT(1),             // entry count
              DECLARATIVE_WITH_ELEMENTS,  // flags
              kFuncRefCode,               // local type
              U32V_1(0)),                 // func ref count
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(reftypes);
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, DeclarativeElementSegmentWithInvalidIndex) {
  WASM_FEATURE_SCOPE(bulk_memory);
  WASM_FEATURE_SCOPE(reftypes);
  static const byte data[] = {
      // sig#0 -----------------------------------------------------------------
      TYPE_SECTION_ONE_SIG_VOID_VOID,
      // funcs -----------------------------------------------------------------
      ONE_EMPTY_FUNCTION(SIG_INDEX(0)),
      // element segments  -----------------------------------------------------
      SECTION(Element,            // section name
              ENTRY_COUNT(1),     // entry count
              DECLARATIVE,        // flags
              kExternalFunction,  // type
              ENTRY_COUNT(2),     // func index count
              U32V_1(0),          // func index
              U32V_1(1)),         // func index
      // code ------------------------------------------------------------------
      ONE_EMPTY_BODY};
  EXPECT_FAILURE_WITH_MSG(data, "element function index 1 out of bounds");
}

TEST_F(WasmModuleVerifyTest, DataCountSectionCorrectPlacement) {
  static const byte data[] = {SECTION(Element, ENTRY_COUNT(0)),
                              SECTION(DataCount, ENTRY_COUNT(0)),
                              SECTION(Code, ENTRY_COUNT(0))};
  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, DataCountSectionAfterCode) {
  static const byte data[] = {SECTION(Code, ENTRY_COUNT(0)),
                              SECTION(DataCount, ENTRY_COUNT(0))};
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result,
                "The DataCount section must appear before the Code section");
}

TEST_F(WasmModuleVerifyTest, DataCountSectionBeforeElement) {
  static const byte data[] = {SECTION(DataCount, ENTRY_COUNT(0)),
                              SECTION(Element, ENTRY_COUNT(0))};
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "unexpected section <Element>");
}

TEST_F(WasmModuleVerifyTest, DataCountSectionAfterStartBeforeElement) {
  STATIC_ASSERT(kStartSectionCode + 1 == kElementSectionCode);
  static const byte data[] = {
      // We need the start section for this test, but the start section must
      // reference a valid function, which requires the type and function
      // sections too.
      TYPE_SECTION(1, SIG_ENTRY_v_v),      // Type section.
      FUNCTION_SECTION(1, 0),              // Function section.
      SECTION(Start, U32V_1(0)),           // Start section.
      SECTION(DataCount, ENTRY_COUNT(0)),  // DataCount section.
      SECTION(Element, ENTRY_COUNT(0))     // Element section.
  };
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "unexpected section <Element>");
}

TEST_F(WasmModuleVerifyTest, MultipleDataCountSections) {
  static const byte data[] = {SECTION(DataCount, ENTRY_COUNT(0)),
                              SECTION(DataCount, ENTRY_COUNT(0))};
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "Multiple DataCount sections not allowed");
}

TEST_F(WasmModuleVerifyTest, DataCountSegmentCountMatch) {
  static const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), 0, 1),  // Memory section.
      SECTION(DataCount, ENTRY_COUNT(1)),     // DataCount section.
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,  // Data section.
              WASM_INIT_EXPR_I32V_1(12), ADD_COUNT('h', 'i'))};

  EXPECT_FAILURE(data);
  WASM_FEATURE_SCOPE(bulk_memory);
  EXPECT_VERIFIES(data);
}

TEST_F(WasmModuleVerifyTest, DataCountSegmentCount_greater) {
  static const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), 0, 1),  // Memory section.
      SECTION(DataCount, ENTRY_COUNT(3)),     // DataCount section.
      SECTION(Data, ENTRY_COUNT(0))};         // Data section.
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "data segments count 0 mismatch (3 expected)");
}

TEST_F(WasmModuleVerifyTest, DataCountSegmentCount_less) {
  static const byte data[] = {
      SECTION(Memory, ENTRY_COUNT(1), 0, 1),  // Memory section.
      SECTION(DataCount, ENTRY_COUNT(0)),     // DataCount section.
      SECTION(Data, ENTRY_COUNT(1), LINEAR_MEMORY_INDEX_0,  // Data section.
              WASM_INIT_EXPR_I32V_1(12), ADD_COUNT('a', 'b', 'c'))};
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "data segments count 1 mismatch (0 expected)");
}

TEST_F(WasmModuleVerifyTest, DataCountSegmentCount_omitted) {
  static const byte data[] = {SECTION(Memory, ENTRY_COUNT(1), 0, 1),
                              SECTION(DataCount, ENTRY_COUNT(1))};
  WASM_FEATURE_SCOPE(bulk_memory);
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "data segments count 0 mismatch (1 expected)");
}

TEST_F(WasmModuleVerifyTest, GcStructIdsPass) {
  WASM_FEATURE_SCOPE(gc);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(reftypes);

  static const byte data[] = {SECTION(
      Type, ENTRY_COUNT(3),
      WASM_STRUCT_DEF(FIELD_COUNT(3), STRUCT_FIELD(kI32Code, true),
                      STRUCT_FIELD(WASM_OPT_REF(0), true),
                      STRUCT_FIELD(WASM_OPT_REF(1), true)),
      WASM_STRUCT_DEF(FIELD_COUNT(2), STRUCT_FIELD(WASM_OPT_REF(0), true),
                      STRUCT_FIELD(WASM_OPT_REF(2), true)),
      WASM_ARRAY_DEF(WASM_OPT_REF(0), true))};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_OK(result);
}

TEST_F(WasmModuleVerifyTest, OutOfBoundsTypeInGlobal) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  static const byte data[] = {
      SECTION(Global, ENTRY_COUNT(1), kRefCode, 0, WASM_REF_NULL(0), kExprEnd)};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "Type index 0 is out of bounds");
}

TEST_F(WasmModuleVerifyTest, OutOfBoundsTypeInType) {
  WASM_FEATURE_SCOPE(reftypes);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(gc);
  static const byte data[] = {
      SECTION(Type, ENTRY_COUNT(1),
              WASM_STRUCT_DEF(FIELD_COUNT(1), STRUCT_FIELD(kRefCode, true)))};
  ModuleResult result = DecodeModule(data, data + sizeof(data));
  EXPECT_NOT_OK(result, "Type index 1 is out of bounds");
}

TEST_F(WasmModuleVerifyTest, IllegalPackedFields) {
  WASM_FEATURE_SCOPE(gc);
  WASM_FEATURE_SCOPE(typed_funcref);
  WASM_FEATURE_SCOPE(reftypes);

  static const byte data[] = {
      SECTION(Global, ENTRY_COUNT(1), kI16Code, 0, WASM_INIT_EXPR_I32V_1(13))};

  ModuleResult result = DecodeModule(data, data + sizeof(data));

  EXPECT_NOT_OK(result, "invalid value type");
}

#undef EXPECT_INIT_EXPR
#undef EXPECT_INIT_EXPR_FAIL
#undef WASM_INIT_EXPR_I32V_1
#undef WASM_INIT_EXPR_I32V_2
#undef WASM_INIT_EXPR_I32V_3
#undef WASM_INIT_EXPR_I32V_4
#undef WASM_INIT_EXPR_I32V_5
#undef WASM_INIT_EXPR_F32
#undef WASM_INIT_EXPR_I64
#undef WASM_INIT_EXPR_F64
#undef WASM_INIT_EXPR_EXTERN_REF_NULL
#undef WASM_INIT_EXPR_FUNC_REF_NULL
#undef WASM_INIT_EXPR_REF_FUNC
#undef WASM_INIT_EXPR_GLOBAL
#undef REF_NULL_ELEMENT
#undef REF_FUNC_ELEMENT
#undef EMPTY_BODY
#undef NOP_BODY
#undef SIG_ENTRY_i_i
#undef UNKNOWN_SECTION
#undef COUNT_ARGS
#undef CHECK_LEB1
#undef ADD_COUNT
#undef SECTION
#undef TYPE_SECTION
#undef FUNCTION_SECTION
#undef FOO_STRING
#undef NO_LOCAL_NAMES
#undef EMPTY_TYPE_SECTION
#undef EMPTY_FUNCTION_SECTION
#undef EMPTY_FUNCTION_BODIES_SECTION
#undef SECTION_NAMES
#undef EMPTY_NAMES_SECTION
#undef SECTION_SRC_MAP
#undef SECTION_COMPILATION_HINTS
#undef FAIL_IF_NO_EXPERIMENTAL_EH
#undef X1
#undef X2
#undef X3
#undef X4
#undef ONE_EMPTY_FUNCTION
#undef TWO_EMPTY_FUNCTIONS
#undef THREE_EMPTY_FUNCTIONS
#undef FOUR_EMPTY_FUNCTIONS
#undef ONE_EMPTY_BODY
#undef TWO_EMPTY_BODIES
#undef THREE_EMPTY_BODIES
#undef FOUR_EMPTY_BODIES
#undef TYPE_SECTION_ONE_SIG_VOID_VOID
#undef LINEAR_MEMORY_INDEX_0

#undef FIELD_COUNT
#undef STRUCT_FIELD
#undef WASM_REF
#undef WASM_OPT_REF
#undef WASM_STRUCT_DEF
#undef WASM_ARRAY_DEF
#undef WASM_FUNCTION_DEF
#undef EXCEPTION_ENTRY
#undef EXPECT_VERIFIES
#undef EXPECT_FAILURE_LEN
#undef EXPECT_FAILURE
#undef EXPECT_OFF_END_FAILURE
#undef EXPECT_OK
#undef EXPECT_NOT_OK

}  // namespace module_decoder_unittest
}  // namespace wasm
}  // namespace internal
}  // namespace v8