// 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/v8.h"

#include "test/cctest/wasm/test-signatures.h"

#include "src/objects.h"

#include "src/wasm/ast-decoder.h"
#include "src/wasm/wasm-macro-gen.h"
#include "src/wasm/wasm-module.h"

namespace v8 {
namespace internal {
namespace wasm {

static const byte kCodeGetLocal0[] = {kExprGetLocal, 0};
static const byte kCodeGetLocal1[] = {kExprGetLocal, 1};
static const byte kCodeSetLocal0[] = {kExprSetLocal, 0, kExprI8Const, 0};

static const LocalType kLocalTypes[] = {kAstI32, kAstI64, kAstF32, kAstF64};
static const MachineType machineTypes[] = {
    MachineType::Int8(),   MachineType::Uint8(),  MachineType::Int16(),
    MachineType::Uint16(), MachineType::Int32(),  MachineType::Uint32(),
    MachineType::Int64(),  MachineType::Uint64(), MachineType::Float32(),
    MachineType::Float64()};

static const WasmOpcode kInt32BinopOpcodes[] = {
    kExprI32Add,  kExprI32Sub,  kExprI32Mul,  kExprI32DivS, kExprI32DivU,
    kExprI32RemS, kExprI32RemU, kExprI32And,  kExprI32Ior,  kExprI32Xor,
    kExprI32Shl,  kExprI32ShrU, kExprI32ShrS, kExprI32Eq,   kExprI32LtS,
    kExprI32LeS,  kExprI32LtU,  kExprI32LeU};

#define WASM_BRV_IF_ZERO(depth, val) \
  kExprBrIf, static_cast<byte>(depth), val, WASM_ZERO

#define EXPECT_VERIFIES(env, x) Verify(kSuccess, env, x, x + arraysize(x))

#define EXPECT_FAILURE(env, x) Verify(kError, env, x, x + arraysize(x))

#define EXPECT_VERIFIES_INLINE(env, ...)                 \
  do {                                                   \
    static byte code[] = {__VA_ARGS__};                  \
    Verify(kSuccess, env, code, code + arraysize(code)); \
  } while (false)


#define EXPECT_FAILURE_INLINE(env, ...)                \
  do {                                                 \
    static byte code[] = {__VA_ARGS__};                \
    Verify(kError, env, code, code + arraysize(code)); \
  } while (false)

#define VERIFY(...)                                        \
  do {                                                     \
    static const byte code[] = {__VA_ARGS__};              \
    Verify(kSuccess, &env_v_i, code, code + sizeof(code)); \
  } while (false)


class WasmDecoderTest : public TestWithZone {
 public:
  WasmDecoderTest() : TestWithZone(), sigs() {
    init_env(&env_i_i, sigs.i_i());
    init_env(&env_v_v, sigs.v_v());
    init_env(&env_v_i, sigs.v_i());
    init_env(&env_i_f, sigs.i_f());
    init_env(&env_i_d, sigs.i_d());
    init_env(&env_l_l, sigs.l_l());
    init_env(&env_f_ff, sigs.f_ff());
    init_env(&env_d_dd, sigs.d_dd());
  }

  TestSignatures sigs;

  FunctionEnv env_i_i;
  FunctionEnv env_v_v;
  FunctionEnv env_v_i;
  FunctionEnv env_i_f;
  FunctionEnv env_i_d;
  FunctionEnv env_l_l;
  FunctionEnv env_f_ff;
  FunctionEnv env_d_dd;

  static void init_env(FunctionEnv* env, FunctionSig* sig) {
    env->module = nullptr;
    env->sig = sig;
    env->local_i32_count = 0;
    env->local_i64_count = 0;
    env->local_f32_count = 0;
    env->local_f64_count = 0;
    env->SumLocals();
  }

  // A wrapper around VerifyWasmCode() that renders a nice failure message.
  void Verify(ErrorCode expected, FunctionEnv* env, const byte* start,
              const byte* end) {
    TreeResult result = VerifyWasmCode(env, start, end);
    if (result.error_code != expected) {
      ptrdiff_t pc = result.error_pc - result.start;
      ptrdiff_t pt = result.error_pt - result.start;
      std::ostringstream str;
      if (expected == kSuccess) {
        str << "Verification failed: " << result.error_code << " pc = +" << pc;
        if (result.error_pt) str << ", pt = +" << pt;
        str << ", msg = " << result.error_msg.get();
      } else {
        str << "Verification expected: " << expected << ", but got "
            << result.error_code;
        if (result.error_code != kSuccess) {
          str << " pc = +" << pc;
          if (result.error_pt) str << ", pt = +" << pt;
        }
      }
      FATAL(str.str().c_str());
    }
  }

  void TestBinop(WasmOpcode opcode, FunctionSig* success) {
    // op(local[0], local[1])
    byte code[] = {static_cast<byte>(opcode), kExprGetLocal, 0, kExprGetLocal,
                   1};
    FunctionEnv env;
    init_env(&env, success);
    EXPECT_VERIFIES(&env, code);

    // Try all combinations of return and parameter types.
    for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
      for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
        for (size_t k = 0; k < arraysize(kLocalTypes); k++) {
          LocalType types[] = {kLocalTypes[i], kLocalTypes[j], kLocalTypes[k]};
          if (types[0] != success->GetReturn(0) ||
              types[1] != success->GetParam(0) ||
              types[2] != success->GetParam(1)) {
            // Test signature mismatch.
            FunctionSig sig(1, 2, types);
            init_env(&env, &sig);
            EXPECT_FAILURE(&env, code);
          }
        }
      }
    }
  }

  void TestUnop(WasmOpcode opcode, FunctionSig* success) {
    TestUnop(opcode, success->GetReturn(), success->GetParam(0));
  }

  void TestUnop(WasmOpcode opcode, LocalType ret_type, LocalType param_type) {
    // Return(op(local[0]))
    byte code[] = {static_cast<byte>(opcode), kExprGetLocal, 0};
    FunctionEnv env;
    {
      LocalType types[] = {ret_type, param_type};
      FunctionSig sig(1, 1, types);
      init_env(&env, &sig);
      EXPECT_VERIFIES(&env, code);
    }

    // Try all combinations of return and parameter types.
    for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
      for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
        LocalType types[] = {kLocalTypes[i], kLocalTypes[j]};
        if (types[0] != ret_type || types[1] != param_type) {
          // Test signature mismatch.
          FunctionSig sig(1, 1, types);
          init_env(&env, &sig);
          EXPECT_FAILURE(&env, code);
        }
      }
    }
  }
};


static FunctionEnv CreateInt32FunctionEnv(FunctionSig* sig, int count) {
  FunctionEnv env;
  env.module = nullptr;
  env.sig = sig;
  env.local_i32_count = count;
  env.local_f64_count = 0;
  env.local_f32_count = 0;
  env.total_locals = static_cast<unsigned>(count + sig->parameter_count());
  return env;
}


TEST_F(WasmDecoderTest, Int8Const) {
  byte code[] = {kExprI8Const, 0};
  for (int i = -128; i < 128; i++) {
    code[1] = static_cast<byte>(i);
    EXPECT_VERIFIES(&env_i_i, code);
  }
}


TEST_F(WasmDecoderTest, EmptyFunction) {
  byte code[] = {0};
  Verify(kSuccess, &env_v_v, code, code);
  Verify(kError, &env_i_i, code, code);
}


TEST_F(WasmDecoderTest, IncompleteIf1) {
  byte code[] = {kExprIf};
  EXPECT_FAILURE(&env_v_v, code);
  EXPECT_FAILURE(&env_i_i, code);
}


TEST_F(WasmDecoderTest, IncompleteIf2) {
  byte code[] = {kExprIf, kExprI8Const, 0};
  EXPECT_FAILURE(&env_v_v, code);
  EXPECT_FAILURE(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Int8Const_fallthru) {
  byte code[] = {kExprI8Const, 0, kExprI8Const, 1};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Int32Const) {
  byte code[] = {kExprI32Const, 0, 0, 0, 0};
  int32_t* ptr = reinterpret_cast<int32_t*>(code + 1);
  const int kInc = 4498211;
  for (int32_t i = kMinInt; i < kMaxInt - kInc; i = i + kInc) {
    *ptr = i;
    EXPECT_VERIFIES(&env_i_i, code);
  }
}


TEST_F(WasmDecoderTest, Int8Const_fallthru2) {
  byte code[] = {kExprI8Const, 0, kExprI32Const, 1, 2, 3, 4};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Int64Const) {
  byte code[] = {kExprI64Const, 0, 0, 0, 0, 0, 0, 0, 0};
  int64_t* ptr = reinterpret_cast<int64_t*>(code + 1);
  const int kInc = 4498211;
  for (int32_t i = kMinInt; i < kMaxInt - kInc; i = i + kInc) {
    *ptr = (static_cast<int64_t>(i) << 32) | i;
    EXPECT_VERIFIES(&env_l_l, code);
  }
}


TEST_F(WasmDecoderTest, Float32Const) {
  byte code[] = {kExprF32Const, 0, 0, 0, 0};
  float* ptr = reinterpret_cast<float*>(code + 1);
  for (int i = 0; i < 30; i++) {
    *ptr = i * -7.75f;
    EXPECT_VERIFIES(&env_f_ff, code);
  }
}


TEST_F(WasmDecoderTest, Float64Const) {
  byte code[] = {kExprF64Const, 0, 0, 0, 0, 0, 0, 0, 0};
  double* ptr = reinterpret_cast<double*>(code + 1);
  for (int i = 0; i < 30; i++) {
    *ptr = i * 33.45;
    EXPECT_VERIFIES(&env_d_dd, code);
  }
}


TEST_F(WasmDecoderTest, Int32Const_off_end) {
  byte code[] = {kExprI32Const, 0xaa, 0xbb, 0xcc, 0x44};

  for (int size = 1; size <= 4; size++) {
    Verify(kError, &env_i_i, code, code + size);
  }
}


TEST_F(WasmDecoderTest, GetLocal0_param) {
  EXPECT_VERIFIES(&env_i_i, kCodeGetLocal0);
}


TEST_F(WasmDecoderTest, GetLocal0_local) {
  FunctionEnv env;
  init_env(&env, sigs.i_v());
  env.AddLocals(kAstI32, 1);
  EXPECT_VERIFIES(&env, kCodeGetLocal0);
}


TEST_F(WasmDecoderTest, GetLocal0_param_n) {
  FunctionSig* array[] = {sigs.i_i(), sigs.i_ii(), sigs.i_iii()};

  for (size_t i = 0; i < arraysize(array); i++) {
    FunctionEnv env = CreateInt32FunctionEnv(array[i], 0);
    EXPECT_VERIFIES(&env, kCodeGetLocal0);
  }
}


TEST_F(WasmDecoderTest, GetLocalN_local) {
  for (byte i = 1; i < 8; i++) {
    FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), i);
    for (byte j = 0; j < i; j++) {
      byte code[] = {kExprGetLocal, j};
      EXPECT_VERIFIES(&env, code);
    }
  }
}


TEST_F(WasmDecoderTest, GetLocal0_fail_no_params) {
  FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), 0);

  EXPECT_FAILURE(&env, kCodeGetLocal0);
}


TEST_F(WasmDecoderTest, GetLocal1_fail_no_locals) {
  EXPECT_FAILURE(&env_i_i, kCodeGetLocal1);
}


TEST_F(WasmDecoderTest, GetLocal_off_end) {
  static const byte code[] = {kExprGetLocal};
  EXPECT_FAILURE(&env_i_i, code);
}


TEST_F(WasmDecoderTest, GetLocal_varint) {
  env_i_i.local_i32_count = 1000000000;
  env_i_i.total_locals += 1000000000;

  {
    static const byte code[] = {kExprGetLocal, 0xFF, 0x01};
    EXPECT_VERIFIES(&env_i_i, code);
    EXPECT_FAILURE(&env_i_f, code);
  }

  {
    static const byte code[] = {kExprGetLocal, 0xF0, 0x80, 0x01};
    EXPECT_VERIFIES(&env_i_i, code);
    EXPECT_FAILURE(&env_i_f, code);
  }

  {
    static const byte code[] = {kExprGetLocal, 0xF2, 0x81, 0x82, 0x01};
    EXPECT_VERIFIES(&env_i_i, code);
    EXPECT_FAILURE(&env_i_f, code);
  }

  {
    static const byte code[] = {kExprGetLocal, 0xF3, 0xA1, 0xB1, 0xC1, 0x01};
    EXPECT_VERIFIES(&env_i_i, code);
    EXPECT_FAILURE(&env_i_f, code);
  }
}


TEST_F(WasmDecoderTest, Binops_off_end) {
  byte code1[] = {0};  // [opcode]
  for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
    code1[0] = kInt32BinopOpcodes[i];
    EXPECT_FAILURE(&env_i_i, code1);
  }

  byte code3[] = {0, kExprGetLocal, 0};  // [opcode] [expr]
  for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
    code3[0] = kInt32BinopOpcodes[i];
    EXPECT_FAILURE(&env_i_i, code3);
  }

  byte code4[] = {0, kExprGetLocal, 0, 0};  // [opcode] [expr] [opcode]
  for (size_t i = 0; i < arraysize(kInt32BinopOpcodes); i++) {
    code4[0] = kInt32BinopOpcodes[i];
    code4[3] = kInt32BinopOpcodes[i];
    EXPECT_FAILURE(&env_i_i, code4);
  }
}


//===================================================================
//== Statements
//===================================================================
TEST_F(WasmDecoderTest, Nop) {
  static const byte code[] = {kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, SetLocal0_param) {
  static const byte code[] = {kExprSetLocal, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, SetLocal0_local) {
  byte code[] = {kExprSetLocal, 0, kExprI8Const, 0};
  FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), 1);

  EXPECT_VERIFIES(&env, code);
}


TEST_F(WasmDecoderTest, SetLocalN_local) {
  for (byte i = 1; i < 8; i++) {
    FunctionEnv env = CreateInt32FunctionEnv(sigs.i_v(), i);
    for (byte j = 0; j < i; j++) {
      byte code[] = {kExprSetLocal, j, kExprI8Const, i};
      EXPECT_VERIFIES(&env, code);
    }
  }
}


TEST_F(WasmDecoderTest, Block0) {
  static const byte code[] = {kExprBlock, 0};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Block0_fallthru1) {
  static const byte code[] = {kExprBlock, 0, kExprBlock, 0};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Block1) {
  static const byte code[] = {kExprBlock, 1, kExprSetLocal, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Block0_fallthru2) {
  static const byte code[] = {kExprBlock, 0, kExprSetLocal, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Block2) {
  static const byte code[] = {kExprBlock,    2,                    // --
                              kExprSetLocal, 0, kExprI8Const, 0,   // --
                              kExprSetLocal, 0, kExprI8Const, 0};  // --
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, Block2_fallthru) {
  static const byte code[] = {kExprBlock,    2,                   // --
                              kExprSetLocal, 0, kExprI8Const, 0,  // --
                              kExprSetLocal, 0, kExprI8Const, 0,  // --
                              kExprI8Const,  11};                 // --
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, BlockN) {
  byte block[] = {kExprBlock, 2};

  for (size_t i = 0; i < 10; i++) {
    size_t total = sizeof(block) + sizeof(kCodeSetLocal0) * i;
    byte* code = reinterpret_cast<byte*>(malloc(total));
    memcpy(code, block, sizeof(block));
    code[1] = static_cast<byte>(i);
    for (size_t j = 0; j < i; j++) {
      memcpy(code + sizeof(block) + j * sizeof(kCodeSetLocal0), kCodeSetLocal0,
             sizeof(kCodeSetLocal0));
    }
    Verify(kSuccess, &env_v_i, code, code + total);
    free(code);
  }
}


TEST_F(WasmDecoderTest, BlockN_off_end) {
  for (byte i = 2; i < 10; i++) {
    byte code[] = {kExprBlock, i, kExprNop};
    EXPECT_FAILURE(&env_v_v, code);
  }
}


TEST_F(WasmDecoderTest, Block1_break) {
  static const byte code[] = {kExprBlock, 1, kExprBr, 0, kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Block2_break) {
  static const byte code[] = {kExprBlock, 2, kExprNop, kExprBr, 0, kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Block1_continue) {
  static const byte code[] = {kExprBlock, 1, kExprBr, 1, kExprNop};
  EXPECT_FAILURE(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Block2_continue) {
  static const byte code[] = {kExprBlock, 2, kExprNop, kExprBr, 1, kExprNop};
  EXPECT_FAILURE(&env_v_v, code);
}


TEST_F(WasmDecoderTest, ExprBlock0) {
  static const byte code[] = {kExprBlock, 0};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, ExprBlock1a) {
  static const byte code[] = {kExprBlock, 1, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, ExprBlock1b) {
  static const byte code[] = {kExprBlock, 1, kExprI8Const, 0};
  EXPECT_FAILURE(&env_f_ff, code);
}


TEST_F(WasmDecoderTest, ExprBlock1c) {
  static const byte code[] = {kExprBlock, 1, kExprF32Const, 0, 0, 0, 0};
  EXPECT_VERIFIES(&env_f_ff, code);
}


TEST_F(WasmDecoderTest, IfEmpty) {
  static const byte code[] = {kExprIf, kExprGetLocal, 0, kExprNop};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfSet) {
  static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprSetLocal,
                              0,           kExprI8Const,  0, kExprNop};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfBlock1) {
  static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprBlock,
                              1,           kExprSetLocal, 0, kExprI8Const,
                              0,           kExprNop};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfBlock2) {
  static const byte code[] = {kExprIf, kExprGetLocal, 0, kExprBlock,
                              2,       kExprSetLocal, 0, kExprI8Const,
                              0,       kExprSetLocal, 0, kExprI8Const,
                              0};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfElseEmpty) {
  static const byte code[] = {kExprIfElse, kExprGetLocal, 0, kExprNop,
                              kExprNop};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfElseSet) {
  static const byte code[] = {kExprIfElse,
                              kExprGetLocal,
                              0,  // --
                              kExprSetLocal,
                              0,
                              kExprI8Const,
                              0,  // --
                              kExprSetLocal,
                              0,
                              kExprI8Const,
                              1};  // --
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, IfElseUnreachable) {
  static const byte code[] = {kExprIfElse,      kExprI8Const,  0,
                              kExprUnreachable, kExprGetLocal, 0};

  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType types[] = {kAstI32, kLocalTypes[i]};
    FunctionEnv env;
    FunctionSig sig(1, 1, types);
    init_env(&env, &sig);

    if (kLocalTypes[i] == kAstI32) {
      EXPECT_VERIFIES(&env, code);
    } else {
      EXPECT_FAILURE(&env, code);
    }
  }
}


TEST_F(WasmDecoderTest, Loop0) {
  static const byte code[] = {kExprLoop, 0};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Loop1) {
  static const byte code[] = {kExprLoop, 1, kExprSetLocal, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, Loop2) {
  static const byte code[] = {kExprLoop,     2,                    // --
                              kExprSetLocal, 0, kExprI8Const, 0,   // --
                              kExprSetLocal, 0, kExprI8Const, 0};  // --
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, Loop1_continue) {
  static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Loop1_break) {
  static const byte code[] = {kExprLoop, 1, kExprBr, 1, kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, Loop2_continue) {
  static const byte code[] = {kExprLoop,     2,                   // --
                              kExprSetLocal, 0, kExprI8Const, 0,  // --
                              kExprBr,       0, kExprNop};        // --
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, Loop2_break) {
  static const byte code[] = {kExprLoop,     2,                   // --
                              kExprSetLocal, 0, kExprI8Const, 0,  // --
                              kExprBr,       1, kExprNop};        // --
  EXPECT_VERIFIES(&env_v_i, code);
}


TEST_F(WasmDecoderTest, ExprLoop0) {
  static const byte code[] = {kExprLoop, 0};
  EXPECT_VERIFIES(&env_v_v, code);
}


TEST_F(WasmDecoderTest, ExprLoop1a) {
  static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, ExprLoop1b) {
  static const byte code[] = {kExprLoop, 1, kExprBr, 0, kExprI8Const, 0};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, ExprLoop2_unreachable) {
  static const byte code[] = {kExprLoop,    2, kExprBr, 0,
                              kExprI8Const, 0, kExprNop};
  EXPECT_VERIFIES(&env_i_i, code);
}


TEST_F(WasmDecoderTest, ReturnVoid1) {
  static const byte code[] = {kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
  EXPECT_FAILURE(&env_i_i, code);
  EXPECT_FAILURE(&env_i_f, code);
}


TEST_F(WasmDecoderTest, ReturnVoid2) {
  static const byte code[] = {kExprBlock, 1, kExprBr, 0, kExprNop};
  EXPECT_VERIFIES(&env_v_v, code);
  EXPECT_FAILURE(&env_i_i, code);
  EXPECT_FAILURE(&env_i_f, code);
}


TEST_F(WasmDecoderTest, ReturnVoid3) {
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI8Const, 0);
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI32Const, 0, 0, 0, 0);
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprI64Const, 0, 0, 0, 0, 0, 0, 0, 0);
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprF32Const, 0, 0, 0, 0);
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprF64Const, 0, 0, 0, 0, 0, 0, 0, 0);

  EXPECT_VERIFIES_INLINE(&env_v_i, kExprGetLocal, 0);
}


TEST_F(WasmDecoderTest, Unreachable1) {
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprUnreachable);
  EXPECT_VERIFIES_INLINE(&env_v_v, kExprUnreachable, kExprUnreachable);
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(2, WASM_UNREACHABLE, WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(2, WASM_BR(0), WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(2, WASM_UNREACHABLE, WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(2, WASM_BR(0), WASM_ZERO));
}


TEST_F(WasmDecoderTest, Codeiness) {
  VERIFY(kExprLoop, 2,                       // --
         kExprSetLocal, 0, kExprI8Const, 0,  // --
         kExprBr, 0, kExprNop);              // --
}


TEST_F(WasmDecoderTest, ExprIf1) {
  VERIFY(kExprIf, kExprGetLocal, 0, kExprI8Const, 0, kExprI8Const, 1);
  VERIFY(kExprIf, kExprGetLocal, 0, kExprGetLocal, 0, kExprGetLocal, 0);
  VERIFY(kExprIf, kExprGetLocal, 0, kExprI32Add, kExprGetLocal, 0,
         kExprGetLocal, 0, kExprI8Const, 1);
}


TEST_F(WasmDecoderTest, ExprIf_off_end) {
  static const byte kCode[] = {kExprIf, kExprGetLocal, 0, kExprGetLocal,
                               0,       kExprGetLocal, 0};
  for (size_t len = 1; len < arraysize(kCode); len++) {
    Verify(kError, &env_i_i, kCode, kCode + len);
  }
}


TEST_F(WasmDecoderTest, ExprIf_type) {
  {
    // float|double ? 1 : 2
    static const byte kCode[] = {kExprIfElse, kExprGetLocal, 0, kExprI8Const,
                                 1,           kExprI8Const,  2};
    EXPECT_FAILURE(&env_i_f, kCode);
    EXPECT_FAILURE(&env_i_d, kCode);
  }
  {
    // 1 ? float|double : 2
    static const byte kCode[] = {kExprIfElse, kExprI8Const, 1, kExprGetLocal,
                                 0,           kExprI8Const, 2};
    EXPECT_FAILURE(&env_i_f, kCode);
    EXPECT_FAILURE(&env_i_d, kCode);
  }
  {
    // stmt ? 0 : 1
    static const byte kCode[] = {kExprIfElse, kExprNop,     kExprI8Const,
                                 0,           kExprI8Const, 1};
    EXPECT_FAILURE(&env_i_i, kCode);
  }
  {
    // 0 ? stmt : 1
    static const byte kCode[] = {kExprIfElse, kExprI8Const, 0,
                                 kExprNop,    kExprI8Const, 1};
    EXPECT_FAILURE(&env_i_i, kCode);
  }
  {
    // 0 ? 1 : stmt
    static const byte kCode[] = {kExprIfElse, kExprI8Const, 0, kExprI8Const, 1,
                                 0,           kExprBlock};
    EXPECT_FAILURE(&env_i_i, kCode);
  }
}


TEST_F(WasmDecoderTest, Int64Local_param) {
  EXPECT_VERIFIES(&env_l_l, kCodeGetLocal0);
}


TEST_F(WasmDecoderTest, Int64Locals) {
  for (byte i = 1; i < 8; i++) {
    FunctionEnv env;
    init_env(&env, sigs.l_v());
    env.AddLocals(kAstI64, i);
    for (byte j = 0; j < i; j++) {
      byte code[] = {kExprGetLocal, j};
      EXPECT_VERIFIES(&env, code);
    }
  }
}


TEST_F(WasmDecoderTest, Int32Binops) {
  TestBinop(kExprI32Add, sigs.i_ii());
  TestBinop(kExprI32Sub, sigs.i_ii());
  TestBinop(kExprI32Mul, sigs.i_ii());
  TestBinop(kExprI32DivS, sigs.i_ii());
  TestBinop(kExprI32DivU, sigs.i_ii());
  TestBinop(kExprI32RemS, sigs.i_ii());
  TestBinop(kExprI32RemU, sigs.i_ii());
  TestBinop(kExprI32And, sigs.i_ii());
  TestBinop(kExprI32Ior, sigs.i_ii());
  TestBinop(kExprI32Xor, sigs.i_ii());
  TestBinop(kExprI32Shl, sigs.i_ii());
  TestBinop(kExprI32ShrU, sigs.i_ii());
  TestBinop(kExprI32ShrS, sigs.i_ii());
  TestBinop(kExprI32Eq, sigs.i_ii());
  TestBinop(kExprI32LtS, sigs.i_ii());
  TestBinop(kExprI32LeS, sigs.i_ii());
  TestBinop(kExprI32LtU, sigs.i_ii());
  TestBinop(kExprI32LeU, sigs.i_ii());
}


TEST_F(WasmDecoderTest, DoubleBinops) {
  TestBinop(kExprF64Add, sigs.d_dd());
  TestBinop(kExprF64Sub, sigs.d_dd());
  TestBinop(kExprF64Mul, sigs.d_dd());
  TestBinop(kExprF64Div, sigs.d_dd());

  TestBinop(kExprF64Eq, sigs.i_dd());
  TestBinop(kExprF64Lt, sigs.i_dd());
  TestBinop(kExprF64Le, sigs.i_dd());
}


TEST_F(WasmDecoderTest, FloatBinops) {
  TestBinop(kExprF32Add, sigs.f_ff());
  TestBinop(kExprF32Sub, sigs.f_ff());
  TestBinop(kExprF32Mul, sigs.f_ff());
  TestBinop(kExprF32Div, sigs.f_ff());

  TestBinop(kExprF32Eq, sigs.i_ff());
  TestBinop(kExprF32Lt, sigs.i_ff());
  TestBinop(kExprF32Le, sigs.i_ff());
}


TEST_F(WasmDecoderTest, TypeConversions) {
  TestUnop(kExprI32SConvertF32, kAstI32, kAstF32);
  TestUnop(kExprI32SConvertF64, kAstI32, kAstF64);
  TestUnop(kExprI32UConvertF32, kAstI32, kAstF32);
  TestUnop(kExprI32UConvertF64, kAstI32, kAstF64);
  TestUnop(kExprF64SConvertI32, kAstF64, kAstI32);
  TestUnop(kExprF64UConvertI32, kAstF64, kAstI32);
  TestUnop(kExprF64ConvertF32, kAstF64, kAstF32);
  TestUnop(kExprF32SConvertI32, kAstF32, kAstI32);
  TestUnop(kExprF32UConvertI32, kAstF32, kAstI32);
  TestUnop(kExprF32ConvertF64, kAstF32, kAstF64);
}


TEST_F(WasmDecoderTest, MacrosStmt) {
  VERIFY(WASM_SET_LOCAL(0, WASM_I32(87348)));
  VERIFY(WASM_STORE_MEM(MachineType::Int32(), WASM_I8(24), WASM_I8(40)));
  VERIFY(WASM_IF(WASM_GET_LOCAL(0), WASM_NOP));
  VERIFY(WASM_IF_ELSE(WASM_GET_LOCAL(0), WASM_NOP, WASM_NOP));
  VERIFY(WASM_NOP);
  VERIFY(WASM_BLOCK(1, WASM_NOP));
  VERIFY(WASM_LOOP(1, WASM_NOP));
  VERIFY(WASM_LOOP(1, WASM_BREAK(0)));
  VERIFY(WASM_LOOP(1, WASM_CONTINUE(0)));
}


TEST_F(WasmDecoderTest, MacrosBreak) {
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BREAK(0)));

  EXPECT_VERIFIES_INLINE(&env_i_i, WASM_LOOP(1, WASM_BREAKV(0, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_l_l, WASM_LOOP(1, WASM_BREAKV(0, WASM_I64(0))));
  EXPECT_VERIFIES_INLINE(&env_f_ff,
                         WASM_LOOP(1, WASM_BREAKV(0, WASM_F32(0.0))));
  EXPECT_VERIFIES_INLINE(&env_d_dd,
                         WASM_LOOP(1, WASM_BREAKV(0, WASM_F64(0.0))));
}


TEST_F(WasmDecoderTest, MacrosContinue) {
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_CONTINUE(0)));
}


TEST_F(WasmDecoderTest, MacrosVariadic) {
  VERIFY(WASM_BLOCK(2, WASM_NOP, WASM_NOP));
  VERIFY(WASM_BLOCK(3, WASM_NOP, WASM_NOP, WASM_NOP));
  VERIFY(WASM_LOOP(2, WASM_NOP, WASM_NOP));
  VERIFY(WASM_LOOP(3, WASM_NOP, WASM_NOP, WASM_NOP));
}


TEST_F(WasmDecoderTest, MacrosNestedBlocks) {
  VERIFY(WASM_BLOCK(2, WASM_NOP, WASM_BLOCK(2, WASM_NOP, WASM_NOP)));
  VERIFY(WASM_BLOCK(3, WASM_NOP,                          // --
                    WASM_BLOCK(2, WASM_NOP, WASM_NOP),    // --
                    WASM_BLOCK(2, WASM_NOP, WASM_NOP)));  // --
  VERIFY(WASM_BLOCK(1, WASM_BLOCK(1, WASM_BLOCK(2, WASM_NOP, WASM_NOP))));
}


TEST_F(WasmDecoderTest, MultipleReturn) {
  static LocalType kIntTypes5[] = {kAstI32, kAstI32, kAstI32, kAstI32, kAstI32};
  FunctionSig sig_ii_v(2, 0, kIntTypes5);
  FunctionEnv env_ii_v;
  init_env(&env_ii_v, &sig_ii_v);
  EXPECT_VERIFIES_INLINE(&env_ii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
  EXPECT_FAILURE_INLINE(&env_ii_v, WASM_RETURN(WASM_ZERO));

  FunctionSig sig_iii_v(3, 0, kIntTypes5);
  FunctionEnv env_iii_v;
  init_env(&env_iii_v, &sig_iii_v);
  EXPECT_VERIFIES_INLINE(&env_iii_v,
                         WASM_RETURN(WASM_ZERO, WASM_ONE, WASM_I8(44)));
  EXPECT_FAILURE_INLINE(&env_iii_v, WASM_RETURN(WASM_ZERO, WASM_ONE));
}


TEST_F(WasmDecoderTest, MultipleReturn_fallthru) {
  static LocalType kIntTypes5[] = {kAstI32, kAstI32, kAstI32, kAstI32, kAstI32};
  FunctionSig sig_ii_v(2, 0, kIntTypes5);
  FunctionEnv env_ii_v;
  init_env(&env_ii_v, &sig_ii_v);

  EXPECT_VERIFIES_INLINE(&env_ii_v, WASM_ZERO, WASM_ONE);
  EXPECT_FAILURE_INLINE(&env_ii_v, WASM_ZERO);

  FunctionSig sig_iii_v(3, 0, kIntTypes5);
  FunctionEnv env_iii_v;
  init_env(&env_iii_v, &sig_iii_v);
  EXPECT_VERIFIES_INLINE(&env_iii_v, WASM_ZERO, WASM_ONE, WASM_I8(44));
  EXPECT_FAILURE_INLINE(&env_iii_v, WASM_ZERO, WASM_ONE);
}


TEST_F(WasmDecoderTest, MacrosInt32) {
  VERIFY(WASM_I32_ADD(WASM_GET_LOCAL(0), WASM_I8(12)));
  VERIFY(WASM_I32_SUB(WASM_GET_LOCAL(0), WASM_I8(13)));
  VERIFY(WASM_I32_MUL(WASM_GET_LOCAL(0), WASM_I8(14)));
  VERIFY(WASM_I32_DIVS(WASM_GET_LOCAL(0), WASM_I8(15)));
  VERIFY(WASM_I32_DIVU(WASM_GET_LOCAL(0), WASM_I8(16)));
  VERIFY(WASM_I32_REMS(WASM_GET_LOCAL(0), WASM_I8(17)));
  VERIFY(WASM_I32_REMU(WASM_GET_LOCAL(0), WASM_I8(18)));
  VERIFY(WASM_I32_AND(WASM_GET_LOCAL(0), WASM_I8(19)));
  VERIFY(WASM_I32_IOR(WASM_GET_LOCAL(0), WASM_I8(20)));
  VERIFY(WASM_I32_XOR(WASM_GET_LOCAL(0), WASM_I8(21)));
  VERIFY(WASM_I32_SHL(WASM_GET_LOCAL(0), WASM_I8(22)));
  VERIFY(WASM_I32_SHR(WASM_GET_LOCAL(0), WASM_I8(23)));
  VERIFY(WASM_I32_SAR(WASM_GET_LOCAL(0), WASM_I8(24)));
  VERIFY(WASM_I32_EQ(WASM_GET_LOCAL(0), WASM_I8(25)));
  VERIFY(WASM_I32_NE(WASM_GET_LOCAL(0), WASM_I8(25)));

  VERIFY(WASM_I32_LTS(WASM_GET_LOCAL(0), WASM_I8(26)));
  VERIFY(WASM_I32_LES(WASM_GET_LOCAL(0), WASM_I8(27)));
  VERIFY(WASM_I32_LTU(WASM_GET_LOCAL(0), WASM_I8(28)));
  VERIFY(WASM_I32_LEU(WASM_GET_LOCAL(0), WASM_I8(29)));

  VERIFY(WASM_I32_GTS(WASM_GET_LOCAL(0), WASM_I8(26)));
  VERIFY(WASM_I32_GES(WASM_GET_LOCAL(0), WASM_I8(27)));
  VERIFY(WASM_I32_GTU(WASM_GET_LOCAL(0), WASM_I8(28)));
  VERIFY(WASM_I32_GEU(WASM_GET_LOCAL(0), WASM_I8(29)));
}


TEST_F(WasmDecoderTest, MacrosInt64) {
  FunctionEnv env_i_ll;
  FunctionEnv env_l_ll;
  init_env(&env_i_ll, sigs.i_ll());
  init_env(&env_l_ll, sigs.l_ll());

#define VERIFY_L_LL(...) EXPECT_VERIFIES_INLINE(&env_l_ll, __VA_ARGS__)
#define VERIFY_I_LL(...) EXPECT_VERIFIES_INLINE(&env_i_ll, __VA_ARGS__)

  VERIFY_L_LL(WASM_I64_ADD(WASM_GET_LOCAL(0), WASM_I64(12)));
  VERIFY_L_LL(WASM_I64_SUB(WASM_GET_LOCAL(0), WASM_I64(13)));
  VERIFY_L_LL(WASM_I64_MUL(WASM_GET_LOCAL(0), WASM_I64(14)));
  VERIFY_L_LL(WASM_I64_DIVS(WASM_GET_LOCAL(0), WASM_I64(15)));
  VERIFY_L_LL(WASM_I64_DIVU(WASM_GET_LOCAL(0), WASM_I64(16)));
  VERIFY_L_LL(WASM_I64_REMS(WASM_GET_LOCAL(0), WASM_I64(17)));
  VERIFY_L_LL(WASM_I64_REMU(WASM_GET_LOCAL(0), WASM_I64(18)));
  VERIFY_L_LL(WASM_I64_AND(WASM_GET_LOCAL(0), WASM_I64(19)));
  VERIFY_L_LL(WASM_I64_IOR(WASM_GET_LOCAL(0), WASM_I64(20)));
  VERIFY_L_LL(WASM_I64_XOR(WASM_GET_LOCAL(0), WASM_I64(21)));

  VERIFY_L_LL(WASM_I64_SHL(WASM_GET_LOCAL(0), WASM_I64(22)));
  VERIFY_L_LL(WASM_I64_SHR(WASM_GET_LOCAL(0), WASM_I64(23)));
  VERIFY_L_LL(WASM_I64_SAR(WASM_GET_LOCAL(0), WASM_I64(24)));

  VERIFY_I_LL(WASM_I64_LTS(WASM_GET_LOCAL(0), WASM_I64(26)));
  VERIFY_I_LL(WASM_I64_LES(WASM_GET_LOCAL(0), WASM_I64(27)));
  VERIFY_I_LL(WASM_I64_LTU(WASM_GET_LOCAL(0), WASM_I64(28)));
  VERIFY_I_LL(WASM_I64_LEU(WASM_GET_LOCAL(0), WASM_I64(29)));

  VERIFY_I_LL(WASM_I64_GTS(WASM_GET_LOCAL(0), WASM_I64(26)));
  VERIFY_I_LL(WASM_I64_GES(WASM_GET_LOCAL(0), WASM_I64(27)));
  VERIFY_I_LL(WASM_I64_GTU(WASM_GET_LOCAL(0), WASM_I64(28)));
  VERIFY_I_LL(WASM_I64_GEU(WASM_GET_LOCAL(0), WASM_I64(29)));

  VERIFY_I_LL(WASM_I64_EQ(WASM_GET_LOCAL(0), WASM_I64(25)));
  VERIFY_I_LL(WASM_I64_NE(WASM_GET_LOCAL(0), WASM_I64(25)));
}


TEST_F(WasmDecoderTest, AllSimpleExpressions) {
// Test all simple expressions which are described by a signature.
#define DECODE_TEST(name, opcode, sig)                      \
  {                                                         \
    FunctionSig* sig = WasmOpcodes::Signature(kExpr##name); \
    if (sig->parameter_count() == 1) {                      \
      TestUnop(kExpr##name, sig);                           \
    } else {                                                \
      TestBinop(kExpr##name, sig);                          \
    }                                                       \
  }

  FOREACH_SIMPLE_OPCODE(DECODE_TEST);

#undef DECODE_TEST
}


TEST_F(WasmDecoderTest, MemorySize) {
  byte code[] = {kExprMemorySize};
  EXPECT_VERIFIES(&env_i_i, code);
  EXPECT_FAILURE(&env_f_ff, code);
}


TEST_F(WasmDecoderTest, GrowMemory) {
  byte code[] = {kExprGrowMemory, kExprGetLocal, 0};
  EXPECT_VERIFIES(&env_i_i, code);
  EXPECT_FAILURE(&env_i_d, code);
}


TEST_F(WasmDecoderTest, LoadMemOffset) {
  for (int offset = 0; offset < 128; offset += 7) {
    byte code[] = {kExprI32LoadMem, WasmOpcodes::LoadStoreAccessOf(true),
                   static_cast<byte>(offset), kExprI8Const, 0};
    EXPECT_VERIFIES(&env_i_i, code);
  }
}


TEST_F(WasmDecoderTest, StoreMemOffset) {
  for (int offset = 0; offset < 128; offset += 7) {
    byte code[] = {kExprI32StoreMem,
                   WasmOpcodes::LoadStoreAccessOf(true),
                   static_cast<byte>(offset),
                   kExprI8Const,
                   0,
                   kExprI8Const,
                   0};
    EXPECT_VERIFIES(&env_i_i, code);
  }
}


TEST_F(WasmDecoderTest, LoadMemOffset_varint) {
  byte code1[] = {kExprI32LoadMem, WasmOpcodes::LoadStoreAccessOf(true), 0,
                  kExprI8Const, 0};
  byte code2[] = {kExprI32LoadMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x80,
                  1,
                  kExprI8Const,
                  0};
  byte code3[] = {kExprI32LoadMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x81,
                  0x82,
                  5,
                  kExprI8Const,
                  0};
  byte code4[] = {kExprI32LoadMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x83,
                  0x84,
                  0x85,
                  7,
                  kExprI8Const,
                  0};

  EXPECT_VERIFIES(&env_i_i, code1);
  EXPECT_VERIFIES(&env_i_i, code2);
  EXPECT_VERIFIES(&env_i_i, code3);
  EXPECT_VERIFIES(&env_i_i, code4);
}


TEST_F(WasmDecoderTest, StoreMemOffset_varint) {
  byte code1[] = {kExprI32StoreMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0,
                  kExprI8Const,
                  0,
                  kExprI8Const,
                  0};
  byte code2[] = {kExprI32StoreMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x80,
                  1,
                  kExprI8Const,
                  0,
                  kExprI8Const,
                  0};
  byte code3[] = {kExprI32StoreMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x81,
                  0x82,
                  5,
                  kExprI8Const,
                  0,
                  kExprI8Const,
                  0};
  byte code4[] = {kExprI32StoreMem,
                  WasmOpcodes::LoadStoreAccessOf(true),
                  0x83,
                  0x84,
                  0x85,
                  7,
                  kExprI8Const,
                  0,
                  kExprI8Const,
                  0};

  EXPECT_VERIFIES(&env_i_i, code1);
  EXPECT_VERIFIES(&env_i_i, code2);
  EXPECT_VERIFIES(&env_i_i, code3);
  EXPECT_VERIFIES(&env_i_i, code4);
}


TEST_F(WasmDecoderTest, AllLoadMemCombinations) {
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType local_type = kLocalTypes[i];
    for (size_t j = 0; j < arraysize(machineTypes); j++) {
      MachineType mem_type = machineTypes[j];
      byte code[] = {
          static_cast<byte>(WasmOpcodes::LoadStoreOpcodeOf(mem_type, false)),
          WasmOpcodes::LoadStoreAccessOf(false), kExprI8Const, 0};
      FunctionEnv env;
      FunctionSig sig(1, 0, &local_type);
      init_env(&env, &sig);
      if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
        EXPECT_VERIFIES(&env, code);
      } else {
        EXPECT_FAILURE(&env, code);
      }
    }
  }
}


TEST_F(WasmDecoderTest, AllStoreMemCombinations) {
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType local_type = kLocalTypes[i];
    for (size_t j = 0; j < arraysize(machineTypes); j++) {
      MachineType mem_type = machineTypes[j];
      byte code[] = {
          static_cast<byte>(WasmOpcodes::LoadStoreOpcodeOf(mem_type, true)),
          WasmOpcodes::LoadStoreAccessOf(false),
          kExprI8Const,
          0,
          kExprGetLocal,
          0};
      FunctionEnv env;
      FunctionSig sig(0, 1, &local_type);
      init_env(&env, &sig);
      if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
        EXPECT_VERIFIES(&env, code);
      } else {
        EXPECT_FAILURE(&env, code);
      }
    }
  }
}


namespace {
// A helper for tests that require a module environment for functions and
// globals.
class TestModuleEnv : public ModuleEnv {
 public:
  TestModuleEnv() {
    instance = nullptr;
    module = &mod;
    linker = nullptr;
    mod.globals = new std::vector<WasmGlobal>;
    mod.signatures = new std::vector<FunctionSig*>;
    mod.functions = new std::vector<WasmFunction>;
    mod.import_table = new std::vector<WasmImport>;
  }
  byte AddGlobal(MachineType mem_type) {
    mod.globals->push_back({0, mem_type, 0, false});
    CHECK(mod.globals->size() <= 127);
    return static_cast<byte>(mod.globals->size() - 1);
  }
  byte AddSignature(FunctionSig* sig) {
    mod.signatures->push_back(sig);
    CHECK(mod.signatures->size() <= 127);
    return static_cast<byte>(mod.signatures->size() - 1);
  }
  byte AddFunction(FunctionSig* sig) {
    mod.functions->push_back({sig, 0, 0, 0, 0, 0, 0, 0, false, false});
    CHECK(mod.functions->size() <= 127);
    return static_cast<byte>(mod.functions->size() - 1);
  }
  byte AddImport(FunctionSig* sig) {
    mod.import_table->push_back({sig, 0, 0});
    CHECK(mod.import_table->size() <= 127);
    return static_cast<byte>(mod.import_table->size() - 1);
  }

 private:
  WasmModule mod;
};
}  // namespace


TEST_F(WasmDecoderTest, SimpleCalls) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddFunction(sigs.i_v());
  module_env.AddFunction(sigs.i_i());
  module_env.AddFunction(sigs.i_ii());

  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(0));
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I8(27)));
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_FUNCTION(2, WASM_I8(37), WASM_I8(77)));
}


TEST_F(WasmDecoderTest, CallsWithTooFewArguments) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddFunction(sigs.i_i());
  module_env.AddFunction(sigs.i_ii());
  module_env.AddFunction(sigs.f_ff());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION0(0));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_ZERO));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(2, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, CallsWithSpilloverArgs) {
  static LocalType a_i_ff[] = {kAstI32, kAstF32, kAstF32};
  FunctionSig sig_i_ff(1, 2, a_i_ff);
  FunctionEnv env_i_ff;
  init_env(&env_i_ff, &sig_i_ff);

  TestModuleEnv module_env;
  env_i_ff.module = &module_env;
  env_i_i.module = &module_env;
  env_f_ff.module = &module_env;

  module_env.AddFunction(&sig_i_ff);

  EXPECT_VERIFIES_INLINE(&env_i_i,
                         WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));

  EXPECT_VERIFIES_INLINE(&env_i_ff,
                         WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));

  EXPECT_FAILURE_INLINE(&env_f_ff,
                        WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1)));

  EXPECT_FAILURE_INLINE(
      &env_i_i,
      WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1), WASM_F32(0.2)));

  EXPECT_VERIFIES_INLINE(
      &env_f_ff,
      WASM_CALL_FUNCTION(0, WASM_F32(0.1), WASM_F32(0.1), WASM_F32(11)));
}


TEST_F(WasmDecoderTest, CallsWithMismatchedSigs2) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddFunction(sigs.i_i());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I64(17)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F32(17.1)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F64(17.1)));
}


TEST_F(WasmDecoderTest, CallsWithMismatchedSigs3) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddFunction(sigs.i_f());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I8(17)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_I64(27)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(0, WASM_F64(37.2)));

  module_env.AddFunction(sigs.i_d());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I8(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_I64(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_FUNCTION(1, WASM_F32(17.6)));
}


TEST_F(WasmDecoderTest, SimpleIndirectCalls) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  byte f0 = module_env.AddSignature(sigs.i_v());
  byte f1 = module_env.AddSignature(sigs.i_i());
  byte f2 = module_env.AddSignature(sigs.i_ii());

  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_ZERO));
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(22)));
  EXPECT_VERIFIES_INLINE(
      env, WASM_CALL_INDIRECT(f2, WASM_ZERO, WASM_I8(32), WASM_I8(72)));
}


TEST_F(WasmDecoderTest, IndirectCallsOutOfBounds) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(0, WASM_ZERO));
  module_env.AddSignature(sigs.i_v());
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT0(0, WASM_ZERO));

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(22)));
  module_env.AddSignature(sigs.i_i());
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_INDIRECT(1, WASM_ZERO, WASM_I8(27)));

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(2, WASM_ZERO, WASM_I8(27)));
}


TEST_F(WasmDecoderTest, IndirectCallsWithMismatchedSigs3) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  byte f0 = module_env.AddFunction(sigs.i_f());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I8(17)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_I64(27)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f0, WASM_ZERO, WASM_F64(37.2)));

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_I8(17)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_I64(27)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT0(f0, WASM_F64(37.2)));

  byte f1 = module_env.AddFunction(sigs.i_d());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I8(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_I64(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_INDIRECT(f1, WASM_ZERO, WASM_F32(17.6)));
}

TEST_F(WasmDecoderTest, SimpleImportCalls) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  byte f0 = module_env.AddImport(sigs.i_v());
  byte f1 = module_env.AddImport(sigs.i_i());
  byte f2 = module_env.AddImport(sigs.i_ii());

  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT0(f0));
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I8(22)));
  EXPECT_VERIFIES_INLINE(env, WASM_CALL_IMPORT(f2, WASM_I8(32), WASM_I8(72)));
}

TEST_F(WasmDecoderTest, ImportCallsWithMismatchedSigs3) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  byte f0 = module_env.AddImport(sigs.i_f());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT0(f0));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_I8(17)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_I64(27)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f0, WASM_F64(37.2)));

  byte f1 = module_env.AddImport(sigs.i_d());

  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT0(f1));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I8(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_I64(16)));
  EXPECT_FAILURE_INLINE(env, WASM_CALL_IMPORT(f1, WASM_F32(17.6)));
}

TEST_F(WasmDecoderTest, Int32Globals) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddGlobal(MachineType::Int8());
  module_env.AddGlobal(MachineType::Uint8());
  module_env.AddGlobal(MachineType::Int16());
  module_env.AddGlobal(MachineType::Uint16());
  module_env.AddGlobal(MachineType::Int32());
  module_env.AddGlobal(MachineType::Uint32());

  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(1));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(2));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(3));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(4));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(5));

  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(4, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(5, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, Int32Globals_fail) {
  FunctionEnv* env = &env_i_i;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddGlobal(MachineType::Int64());
  module_env.AddGlobal(MachineType::Uint64());
  module_env.AddGlobal(MachineType::Float32());
  module_env.AddGlobal(MachineType::Float64());

  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(0));
  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(1));
  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(2));
  EXPECT_FAILURE_INLINE(env, WASM_LOAD_GLOBAL(3));

  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(2, WASM_GET_LOCAL(0)));
  EXPECT_FAILURE_INLINE(env, WASM_STORE_GLOBAL(3, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, Int64Globals) {
  FunctionEnv* env = &env_l_l;
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddGlobal(MachineType::Int64());
  module_env.AddGlobal(MachineType::Uint64());

  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(1));

  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(1, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, Float32Globals) {
  FunctionEnv env_f_ff;
  FunctionEnv* env = &env_f_ff;
  init_env(env, sigs.f_ff());
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddGlobal(MachineType::Float32());

  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, Float64Globals) {
  FunctionEnv env_d_dd;
  FunctionEnv* env = &env_d_dd;
  init_env(env, sigs.d_dd());
  TestModuleEnv module_env;
  env->module = &module_env;

  module_env.AddGlobal(MachineType::Float64());

  EXPECT_VERIFIES_INLINE(env, WASM_LOAD_GLOBAL(0));
  EXPECT_VERIFIES_INLINE(env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
}


TEST_F(WasmDecoderTest, AllLoadGlobalCombinations) {
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType local_type = kLocalTypes[i];
    for (size_t j = 0; j < arraysize(machineTypes); j++) {
      MachineType mem_type = machineTypes[j];
      FunctionEnv env;
      FunctionSig sig(1, 0, &local_type);
      TestModuleEnv module_env;
      init_env(&env, &sig);
      env.module = &module_env;
      module_env.AddGlobal(mem_type);
      if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
        EXPECT_VERIFIES_INLINE(&env, WASM_LOAD_GLOBAL(0));
      } else {
        EXPECT_FAILURE_INLINE(&env, WASM_LOAD_GLOBAL(0));
      }
    }
  }
}


TEST_F(WasmDecoderTest, AllStoreGlobalCombinations) {
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType local_type = kLocalTypes[i];
    for (size_t j = 0; j < arraysize(machineTypes); j++) {
      MachineType mem_type = machineTypes[j];
      FunctionEnv env;
      FunctionSig sig(0, 1, &local_type);
      TestModuleEnv module_env;
      init_env(&env, &sig);
      env.module = &module_env;
      module_env.AddGlobal(mem_type);
      if (local_type == WasmOpcodes::LocalTypeFor(mem_type)) {
        EXPECT_VERIFIES_INLINE(&env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
      } else {
        EXPECT_FAILURE_INLINE(&env, WASM_STORE_GLOBAL(0, WASM_GET_LOCAL(0)));
      }
    }
  }
}


TEST_F(WasmDecoderTest, BreakNesting1) {
  for (int i = 0; i < 5; i++) {
    // (block[2] (loop[2] (if (get p) break[N]) (set p 1)) p)
    byte code[] = {WASM_BLOCK(
        2, WASM_LOOP(2, WASM_IF(WASM_GET_LOCAL(0), WASM_BRV(i, WASM_ZERO)),
                     WASM_SET_LOCAL(0, WASM_I8(1))),
        WASM_GET_LOCAL(0))};
    if (i < 3) {
      EXPECT_VERIFIES(&env_i_i, code);
    } else {
      EXPECT_FAILURE(&env_i_i, code);
    }
  }
}


TEST_F(WasmDecoderTest, BreakNesting2) {
  env_v_v.AddLocals(kAstI32, 1);
  for (int i = 0; i < 5; i++) {
    // (block[2] (loop[2] (if (get p) break[N]) (set p 1)) (return p)) (11)
    byte code[] = {
        WASM_BLOCK(1, WASM_LOOP(2, WASM_IF(WASM_GET_LOCAL(0), WASM_BREAK(i)),
                                WASM_SET_LOCAL(0, WASM_I8(1)))),
        WASM_I8(11)};
    if (i < 2) {
      EXPECT_VERIFIES(&env_v_v, code);
    } else {
      EXPECT_FAILURE(&env_v_v, code);
    }
  }
}


TEST_F(WasmDecoderTest, BreakNesting3) {
  env_v_v.AddLocals(kAstI32, 1);
  for (int i = 0; i < 5; i++) {
    // (block[1] (loop[1] (block[1] (if (get p) break[N])
    byte code[] = {WASM_BLOCK(
        1, WASM_LOOP(
               1, WASM_BLOCK(1, WASM_IF(WASM_GET_LOCAL(0), WASM_BREAK(i)))))};
    if (i < 3) {
      EXPECT_VERIFIES(&env_v_v, code);
    } else {
      EXPECT_FAILURE(&env_v_v, code);
    }
  }
}


TEST_F(WasmDecoderTest, BreaksWithMultipleTypes) {
  EXPECT_FAILURE_INLINE(
      &env_i_i, WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_I8(7)), WASM_F32(7.7)));

  EXPECT_FAILURE_INLINE(&env_i_i,
                        WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_I8(7)),
                                   WASM_BRV_IF_ZERO(0, WASM_F32(7.7))));
  EXPECT_FAILURE_INLINE(&env_i_i,
                        WASM_BLOCK(3, WASM_BRV_IF_ZERO(0, WASM_I8(8)),
                                   WASM_BRV_IF_ZERO(0, WASM_I8(0)),
                                   WASM_BRV_IF_ZERO(0, WASM_F32(7.7))));
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_BLOCK(3, WASM_BRV_IF_ZERO(0, WASM_I8(9)),
                                             WASM_BRV_IF_ZERO(0, WASM_F32(7.7)),
                                             WASM_BRV_IF_ZERO(0, WASM_I8(11))));
}


TEST_F(WasmDecoderTest, BreakNesting_6_levels) {
  for (int mask = 0; mask < 64; mask++) {
    for (int i = 0; i < 14; i++) {
      byte code[] = {
          kExprBlock, 1,  // --
          kExprBlock, 1,  // --
          kExprBlock, 1,  // --
          kExprBlock, 1,  // --
          kExprBlock, 1,  // --
          kExprBlock, 1,  // --
          kExprBr,    static_cast<byte>(i),
          kExprNop  // --
      };

      int depth = 6;
      for (int l = 0; l < 6; l++) {
        if (mask & (1 << l)) {
          code[l * 2] = kExprLoop;
          depth++;
        }
      }

      if (i < depth) {
        EXPECT_VERIFIES(&env_v_v, code);
      } else {
        EXPECT_FAILURE(&env_v_v, code);
      }
    }
  }
}


TEST_F(WasmDecoderTest, ExprBreak_TypeCheck) {
  FunctionEnv* envs[] = {&env_i_i, &env_l_l, &env_f_ff, &env_d_dd};
  for (size_t i = 0; i < arraysize(envs); i++) {
    FunctionEnv* env = envs[i];
    // unify X and X => OK
    EXPECT_VERIFIES_INLINE(
        env, WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                        WASM_GET_LOCAL(0)));
  }

  // unify i32 and f32 => fail
  EXPECT_FAILURE_INLINE(
      &env_i_i,
      WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_ZERO)), WASM_F32(1.2)));

  // unify f64 and f64 => OK
  EXPECT_VERIFIES_INLINE(
      &env_d_dd,
      WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                 WASM_F64(1.2)));
}


TEST_F(WasmDecoderTest, ExprBreak_TypeCheckAll) {
  byte code1[] = {WASM_BLOCK(2,
                             WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(0))),
                             WASM_GET_LOCAL(1))};
  byte code2[] = {
      WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV_IF_ZERO(0, WASM_GET_LOCAL(0))),
                 WASM_GET_LOCAL(1))};

  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
      FunctionEnv env;
      LocalType storage[] = {kLocalTypes[i], kLocalTypes[i], kLocalTypes[j]};
      FunctionSig sig(1, 2, storage);
      init_env(&env, &sig);

      if (i == j) {
        EXPECT_VERIFIES(&env, code1);
        EXPECT_VERIFIES(&env, code2);
      } else {
        EXPECT_FAILURE(&env, code1);
        EXPECT_FAILURE(&env, code2);
      }
    }
  }
}


TEST_F(WasmDecoderTest, ExprBr_Unify) {
  FunctionEnv env;

  for (int which = 0; which < 2; which++) {
    for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
      LocalType type = kLocalTypes[i];
      LocalType storage[] = {kAstI32, kAstI32, type};
      FunctionSig sig(1, 2, storage);
      init_env(&env, &sig);  // (i32, X) -> i32

      byte code1[] = {
          WASM_BLOCK(2, WASM_IF(WASM_ZERO, WASM_BRV(0, WASM_GET_LOCAL(which))),
                     WASM_GET_LOCAL(which ^ 1))};
      byte code2[] = {
          WASM_LOOP(2, WASM_IF(WASM_ZERO, WASM_BRV(1, WASM_GET_LOCAL(which))),
                    WASM_GET_LOCAL(which ^ 1))};


      if (type == kAstI32) {
        EXPECT_VERIFIES(&env, code1);
        EXPECT_VERIFIES(&env, code2);
      } else {
        EXPECT_FAILURE(&env, code1);
        EXPECT_FAILURE(&env, code2);
      }
    }
  }
}

TEST_F(WasmDecoderTest, ExprBrIf_cond_type) {
  FunctionEnv env;
  byte code[] = {
      WASM_BLOCK(1, WASM_BRV_IF(0, WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)))};
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
      LocalType types[] = {kLocalTypes[i], kLocalTypes[j]};
      FunctionSig sig(0, 2, types);
      init_env(&env, &sig);

      if (types[1] == kAstI32) {
        EXPECT_VERIFIES(&env, code);
      } else {
        EXPECT_FAILURE(&env, code);
      }
    }
  }
}

TEST_F(WasmDecoderTest, ExprBrIf_val_type) {
  FunctionEnv env;
  byte code[] = {
      WASM_BLOCK(2, WASM_BRV_IF(0, WASM_GET_LOCAL(1), WASM_GET_LOCAL(2)),
                 WASM_GET_LOCAL(0))};
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    for (size_t j = 0; j < arraysize(kLocalTypes); j++) {
      LocalType types[] = {kLocalTypes[i], kLocalTypes[i], kLocalTypes[j],
                           kAstI32};
      FunctionSig sig(1, 3, types);
      init_env(&env, &sig);

      if (i == j) {
        EXPECT_VERIFIES(&env, code);
      } else {
        EXPECT_FAILURE(&env, code);
      }
    }
  }
}


TEST_F(WasmDecoderTest, ExprBrIf_Unify) {
  FunctionEnv env;

  for (int which = 0; which < 2; which++) {
    for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
      LocalType type = kLocalTypes[i];
      LocalType storage[] = {kAstI32, kAstI32, type};
      FunctionSig sig(1, 2, storage);
      init_env(&env, &sig);  // (i32, X) -> i32

      byte code1[] = {WASM_BLOCK(2, WASM_BRV_IF_ZERO(0, WASM_GET_LOCAL(which)),
                                 WASM_GET_LOCAL(which ^ 1))};
      byte code2[] = {WASM_LOOP(2, WASM_BRV_IF_ZERO(1, WASM_GET_LOCAL(which)),
                                WASM_GET_LOCAL(which ^ 1))};

      if (type == kAstI32) {
        EXPECT_VERIFIES(&env, code1);
        EXPECT_VERIFIES(&env, code2);
      } else {
        EXPECT_FAILURE(&env, code1);
        EXPECT_FAILURE(&env, code2);
      }
    }
  }
}


TEST_F(WasmDecoderTest, TableSwitch0) {
  static byte code[] = {kExprTableSwitch, 0, 0, 0, 0};
  EXPECT_FAILURE(&env_v_v, code);
}


TEST_F(WasmDecoderTest, TableSwitch0b) {
  static byte code[] = {kExprTableSwitch, 0, 0, 0, 0, kExprI8Const, 11};
  EXPECT_FAILURE(&env_v_v, code);
  EXPECT_FAILURE(&env_i_i, code);
}


TEST_F(WasmDecoderTest, TableSwitch0c) {
  static byte code[] = {
      WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(0)), WASM_I8(67))};
  EXPECT_VERIFIES(&env_v_v, code);
}

TEST_F(WasmDecoderTest, TableSwitch0d) {
  static byte code[] = {
      WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 2, WASM_CASE_BR(0), WASM_CASE_BR(1)),
                 WASM_I8(67))};
  EXPECT_VERIFIES(&env_v_v, code);
}

TEST_F(WasmDecoderTest, TableSwitch1) {
  static byte code[] = {WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
                        WASM_TABLESWITCH_BODY(WASM_I8(0), WASM_I8(9))};
  EXPECT_VERIFIES(&env_i_i, code);
  EXPECT_VERIFIES(&env_v_v, code);
  EXPECT_FAILURE(&env_f_ff, code);
  EXPECT_FAILURE(&env_d_dd, code);
}


TEST_F(WasmDecoderTest, TableSwitch_off_end) {
  static byte code[] = {WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
                        WASM_TABLESWITCH_BODY(WASM_I8(0), WASM_I8(9))};
  for (size_t len = arraysize(code) - 1; len > 0; len--) {
    Verify(kError, &env_v_v, code, code + len);
  }
}


TEST_F(WasmDecoderTest, TableSwitch2) {
  static byte code[] = {
      WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
      WASM_TABLESWITCH_BODY(WASM_I8(3), WASM_I8(10), WASM_I8(11))};
  EXPECT_VERIFIES(&env_i_i, code);
  EXPECT_VERIFIES(&env_v_v, code);
  EXPECT_FAILURE(&env_f_ff, code);
  EXPECT_FAILURE(&env_d_dd, code);
}


TEST_F(WasmDecoderTest, TableSwitch1b) {
  EXPECT_VERIFIES_INLINE(&env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
                         WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_ZERO));

  EXPECT_VERIFIES_INLINE(&env_f_ff, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
                         WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_F32(0.0)));

  EXPECT_VERIFIES_INLINE(&env_d_dd, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
                         WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_F64(0.0)));
}

TEST_F(WasmDecoderTest, TableSwitch_br1) {
  for (int depth = 0; depth < 2; depth++) {
    byte code[] = {WASM_BLOCK(1, WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(depth)),
                              WASM_GET_LOCAL(0))};
    EXPECT_VERIFIES(&env_v_i, code);
    EXPECT_FAILURE(&env_i_i, code);
  }
}


TEST_F(WasmDecoderTest, TableSwitch_invalid_br) {
  for (int depth = 1; depth < 4; depth++) {
    EXPECT_FAILURE_INLINE(&env_v_i,
                          WASM_TABLESWITCH_OP(0, 1, WASM_CASE_BR(depth)),
                          WASM_GET_LOCAL(0));
    EXPECT_FAILURE_INLINE(
        &env_v_i,
        WASM_TABLESWITCH_OP(0, 2, WASM_CASE_BR(depth), WASM_CASE_BR(depth)),
        WASM_GET_LOCAL(0));
  }
}


TEST_F(WasmDecoderTest, TableSwitch_invalid_case_ref) {
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_TABLESWITCH_OP(0, 1, WASM_CASE(0)),
                        WASM_GET_LOCAL(0));
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(1)),
                        WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_ZERO));
}


TEST_F(WasmDecoderTest, TableSwitch1_br) {
  EXPECT_VERIFIES_INLINE(
      &env_i_i, WASM_TABLESWITCH_OP(1, 1, WASM_CASE(0)),
      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_ZERO)));
}


TEST_F(WasmDecoderTest, TableSwitch2_br) {
  EXPECT_VERIFIES_INLINE(
      &env_i_i, WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_I8(0)),
                            WASM_BRV(0, WASM_I8(1))));

  EXPECT_FAILURE_INLINE(
      &env_f_ff, WASM_TABLESWITCH_OP(2, 2, WASM_CASE(0), WASM_CASE(1)),
      WASM_TABLESWITCH_BODY(WASM_ZERO, WASM_BRV(0, WASM_I8(3)),
                            WASM_BRV(0, WASM_I8(4))));
}


TEST_F(WasmDecoderTest, TableSwitch2x2) {
  EXPECT_VERIFIES_INLINE(
      &env_i_i, WASM_TABLESWITCH_OP(2, 4, WASM_CASE(0), WASM_CASE(1),
                                    WASM_CASE(0), WASM_CASE(1)),
      WASM_TABLESWITCH_BODY(WASM_GET_LOCAL(0), WASM_BRV(0, WASM_I8(3)),
                            WASM_BRV(0, WASM_I8(4))));
}


TEST_F(WasmDecoderTest, ExprBreakNesting1) {
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BRV(0, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BR(0)));
  EXPECT_VERIFIES_INLINE(&env_v_v,
                         WASM_BLOCK(1, WASM_BRV_IF(0, WASM_ZERO, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_BLOCK(1, WASM_BR_IF(0, WASM_ZERO)));

  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BRV(0, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR(0)));
  EXPECT_VERIFIES_INLINE(&env_v_v,
                         WASM_LOOP(1, WASM_BRV_IF(0, WASM_ZERO, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR_IF(0, WASM_ZERO)));

  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BRV(1, WASM_ZERO)));
  EXPECT_VERIFIES_INLINE(&env_v_v, WASM_LOOP(1, WASM_BR(1)));
}


TEST_F(WasmDecoderTest, Select) {
  EXPECT_VERIFIES_INLINE(
      &env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_f_ff,
                         WASM_SELECT(WASM_F32(0.0), WASM_F32(0.0), WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_d_dd,
                         WASM_SELECT(WASM_F64(0.0), WASM_F64(0.0), WASM_ZERO));
  EXPECT_VERIFIES_INLINE(&env_l_l,
                         WASM_SELECT(WASM_I64(0), WASM_I64(0), WASM_ZERO));
}

TEST_F(WasmDecoderTest, Select_fail1) {
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_F32(0.0), WASM_GET_LOCAL(0),
                                              WASM_GET_LOCAL(0)));
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_F32(0.0),
                                              WASM_GET_LOCAL(0)));
  EXPECT_FAILURE_INLINE(
      &env_i_i,
      WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_F32(0.0)));
}

TEST_F(WasmDecoderTest, Select_fail2) {
  for (size_t i = 0; i < arraysize(kLocalTypes); i++) {
    LocalType type = kLocalTypes[i];
    if (type == kAstI32) continue;

    LocalType types[] = {type, kAstI32, type};
    FunctionSig sig(1, 2, types);
    FunctionEnv env;
    init_env(&env, &sig);

    EXPECT_VERIFIES_INLINE(
        &env,
        WASM_SELECT(WASM_GET_LOCAL(1), WASM_GET_LOCAL(1), WASM_GET_LOCAL(0)));

    EXPECT_FAILURE_INLINE(
        &env,
        WASM_SELECT(WASM_GET_LOCAL(1), WASM_GET_LOCAL(0), WASM_GET_LOCAL(0)));

    EXPECT_FAILURE_INLINE(
        &env,
        WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1), WASM_GET_LOCAL(0)));

    EXPECT_FAILURE_INLINE(
        &env,
        WASM_SELECT(WASM_GET_LOCAL(0), WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
  }
}


TEST_F(WasmDecoderTest, Select_TypeCheck) {
  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0),
                                              WASM_GET_LOCAL(0)));

  EXPECT_FAILURE_INLINE(&env_i_i, WASM_SELECT(WASM_GET_LOCAL(0), WASM_F64(0.25),
                                              WASM_GET_LOCAL(0)));

  EXPECT_FAILURE_INLINE(
      &env_i_i, WASM_SELECT(WASM_F32(9.9), WASM_GET_LOCAL(0), WASM_I64(0)));
}


class WasmOpcodeLengthTest : public TestWithZone {
 public:
  WasmOpcodeLengthTest() : TestWithZone() {}
};

#define EXPECT_LENGTH(expected, opcode)                           \
  {                                                               \
    static const byte code[] = {opcode, 0, 0, 0, 0, 0, 0, 0, 0};  \
    EXPECT_EQ(expected, OpcodeLength(code, code + sizeof(code))); \
  }

TEST_F(WasmOpcodeLengthTest, Statements) {
  EXPECT_LENGTH(1, kExprNop);
  EXPECT_LENGTH(2, kExprBlock);
  EXPECT_LENGTH(2, kExprLoop);
  EXPECT_LENGTH(1, kExprIf);
  EXPECT_LENGTH(1, kExprIfElse);
  EXPECT_LENGTH(1, kExprSelect);
  EXPECT_LENGTH(2, kExprBr);
  EXPECT_LENGTH(2, kExprBrIf);
}


TEST_F(WasmOpcodeLengthTest, MiscExpressions) {
  EXPECT_LENGTH(2, kExprI8Const);
  EXPECT_LENGTH(5, kExprI32Const);
  EXPECT_LENGTH(5, kExprF32Const);
  EXPECT_LENGTH(9, kExprI64Const);
  EXPECT_LENGTH(9, kExprF64Const);
  EXPECT_LENGTH(2, kExprGetLocal);
  EXPECT_LENGTH(2, kExprSetLocal);
  EXPECT_LENGTH(2, kExprLoadGlobal);
  EXPECT_LENGTH(2, kExprStoreGlobal);
  EXPECT_LENGTH(2, kExprCallFunction);
  EXPECT_LENGTH(2, kExprCallImport);
  EXPECT_LENGTH(2, kExprCallIndirect);
  EXPECT_LENGTH(1, kExprIf);
  EXPECT_LENGTH(1, kExprIfElse);
  EXPECT_LENGTH(2, kExprBlock);
  EXPECT_LENGTH(2, kExprLoop);
  EXPECT_LENGTH(2, kExprBr);
  EXPECT_LENGTH(2, kExprBrIf);
}


TEST_F(WasmOpcodeLengthTest, VariableLength) {
  byte size2[] = {kExprLoadGlobal, 1};
  byte size3[] = {kExprLoadGlobal, 1 | 0x80, 2};
  byte size4[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3};
  byte size5[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3 | 0x80, 4};
  byte size6[] = {kExprLoadGlobal, 1 | 0x80, 2 | 0x80, 3 | 0x80, 4 | 0x80, 5};

  EXPECT_EQ(2, OpcodeLength(size2, size2 + sizeof(size2)));
  EXPECT_EQ(3, OpcodeLength(size3, size3 + sizeof(size3)));
  EXPECT_EQ(4, OpcodeLength(size4, size4 + sizeof(size4)));
  EXPECT_EQ(5, OpcodeLength(size5, size5 + sizeof(size5)));
  EXPECT_EQ(6, OpcodeLength(size6, size6 + sizeof(size6)));
}


TEST_F(WasmOpcodeLengthTest, LoadsAndStores) {
  EXPECT_LENGTH(2, kExprI32LoadMem8S);
  EXPECT_LENGTH(2, kExprI32LoadMem8U);
  EXPECT_LENGTH(2, kExprI32LoadMem16S);
  EXPECT_LENGTH(2, kExprI32LoadMem16U);
  EXPECT_LENGTH(2, kExprI32LoadMem);
  EXPECT_LENGTH(2, kExprI64LoadMem8S);
  EXPECT_LENGTH(2, kExprI64LoadMem8U);
  EXPECT_LENGTH(2, kExprI64LoadMem16S);
  EXPECT_LENGTH(2, kExprI64LoadMem16U);
  EXPECT_LENGTH(2, kExprI64LoadMem32S);
  EXPECT_LENGTH(2, kExprI64LoadMem32U);
  EXPECT_LENGTH(2, kExprI64LoadMem);
  EXPECT_LENGTH(2, kExprF32LoadMem);
  EXPECT_LENGTH(2, kExprF64LoadMem);

  EXPECT_LENGTH(2, kExprI32StoreMem8);
  EXPECT_LENGTH(2, kExprI32StoreMem16);
  EXPECT_LENGTH(2, kExprI32StoreMem);
  EXPECT_LENGTH(2, kExprI64StoreMem8);
  EXPECT_LENGTH(2, kExprI64StoreMem16);
  EXPECT_LENGTH(2, kExprI64StoreMem32);
  EXPECT_LENGTH(2, kExprI64StoreMem);
  EXPECT_LENGTH(2, kExprF32StoreMem);
  EXPECT_LENGTH(2, kExprF64StoreMem);
}


TEST_F(WasmOpcodeLengthTest, MiscMemExpressions) {
  EXPECT_LENGTH(1, kExprMemorySize);
  EXPECT_LENGTH(1, kExprGrowMemory);
}


TEST_F(WasmOpcodeLengthTest, SimpleExpressions) {
  EXPECT_LENGTH(1, kExprI32Add);
  EXPECT_LENGTH(1, kExprI32Sub);
  EXPECT_LENGTH(1, kExprI32Mul);
  EXPECT_LENGTH(1, kExprI32DivS);
  EXPECT_LENGTH(1, kExprI32DivU);
  EXPECT_LENGTH(1, kExprI32RemS);
  EXPECT_LENGTH(1, kExprI32RemU);
  EXPECT_LENGTH(1, kExprI32And);
  EXPECT_LENGTH(1, kExprI32Ior);
  EXPECT_LENGTH(1, kExprI32Xor);
  EXPECT_LENGTH(1, kExprI32Shl);
  EXPECT_LENGTH(1, kExprI32ShrU);
  EXPECT_LENGTH(1, kExprI32ShrS);
  EXPECT_LENGTH(1, kExprI32Eq);
  EXPECT_LENGTH(1, kExprI32Ne);
  EXPECT_LENGTH(1, kExprI32LtS);
  EXPECT_LENGTH(1, kExprI32LeS);
  EXPECT_LENGTH(1, kExprI32LtU);
  EXPECT_LENGTH(1, kExprI32LeU);
  EXPECT_LENGTH(1, kExprI32GtS);
  EXPECT_LENGTH(1, kExprI32GeS);
  EXPECT_LENGTH(1, kExprI32GtU);
  EXPECT_LENGTH(1, kExprI32GeU);
  EXPECT_LENGTH(1, kExprI32Clz);
  EXPECT_LENGTH(1, kExprI32Ctz);
  EXPECT_LENGTH(1, kExprI32Popcnt);
  EXPECT_LENGTH(1, kExprBoolNot);
  EXPECT_LENGTH(1, kExprI64Add);
  EXPECT_LENGTH(1, kExprI64Sub);
  EXPECT_LENGTH(1, kExprI64Mul);
  EXPECT_LENGTH(1, kExprI64DivS);
  EXPECT_LENGTH(1, kExprI64DivU);
  EXPECT_LENGTH(1, kExprI64RemS);
  EXPECT_LENGTH(1, kExprI64RemU);
  EXPECT_LENGTH(1, kExprI64And);
  EXPECT_LENGTH(1, kExprI64Ior);
  EXPECT_LENGTH(1, kExprI64Xor);
  EXPECT_LENGTH(1, kExprI64Shl);
  EXPECT_LENGTH(1, kExprI64ShrU);
  EXPECT_LENGTH(1, kExprI64ShrS);
  EXPECT_LENGTH(1, kExprI64Eq);
  EXPECT_LENGTH(1, kExprI64Ne);
  EXPECT_LENGTH(1, kExprI64LtS);
  EXPECT_LENGTH(1, kExprI64LeS);
  EXPECT_LENGTH(1, kExprI64LtU);
  EXPECT_LENGTH(1, kExprI64LeU);
  EXPECT_LENGTH(1, kExprI64GtS);
  EXPECT_LENGTH(1, kExprI64GeS);
  EXPECT_LENGTH(1, kExprI64GtU);
  EXPECT_LENGTH(1, kExprI64GeU);
  EXPECT_LENGTH(1, kExprI64Clz);
  EXPECT_LENGTH(1, kExprI64Ctz);
  EXPECT_LENGTH(1, kExprI64Popcnt);
  EXPECT_LENGTH(1, kExprF32Add);
  EXPECT_LENGTH(1, kExprF32Sub);
  EXPECT_LENGTH(1, kExprF32Mul);
  EXPECT_LENGTH(1, kExprF32Div);
  EXPECT_LENGTH(1, kExprF32Min);
  EXPECT_LENGTH(1, kExprF32Max);
  EXPECT_LENGTH(1, kExprF32Abs);
  EXPECT_LENGTH(1, kExprF32Neg);
  EXPECT_LENGTH(1, kExprF32CopySign);
  EXPECT_LENGTH(1, kExprF32Ceil);
  EXPECT_LENGTH(1, kExprF32Floor);
  EXPECT_LENGTH(1, kExprF32Trunc);
  EXPECT_LENGTH(1, kExprF32NearestInt);
  EXPECT_LENGTH(1, kExprF32Sqrt);
  EXPECT_LENGTH(1, kExprF32Eq);
  EXPECT_LENGTH(1, kExprF32Ne);
  EXPECT_LENGTH(1, kExprF32Lt);
  EXPECT_LENGTH(1, kExprF32Le);
  EXPECT_LENGTH(1, kExprF32Gt);
  EXPECT_LENGTH(1, kExprF32Ge);
  EXPECT_LENGTH(1, kExprF64Add);
  EXPECT_LENGTH(1, kExprF64Sub);
  EXPECT_LENGTH(1, kExprF64Mul);
  EXPECT_LENGTH(1, kExprF64Div);
  EXPECT_LENGTH(1, kExprF64Min);
  EXPECT_LENGTH(1, kExprF64Max);
  EXPECT_LENGTH(1, kExprF64Abs);
  EXPECT_LENGTH(1, kExprF64Neg);
  EXPECT_LENGTH(1, kExprF64CopySign);
  EXPECT_LENGTH(1, kExprF64Ceil);
  EXPECT_LENGTH(1, kExprF64Floor);
  EXPECT_LENGTH(1, kExprF64Trunc);
  EXPECT_LENGTH(1, kExprF64NearestInt);
  EXPECT_LENGTH(1, kExprF64Sqrt);
  EXPECT_LENGTH(1, kExprF64Eq);
  EXPECT_LENGTH(1, kExprF64Ne);
  EXPECT_LENGTH(1, kExprF64Lt);
  EXPECT_LENGTH(1, kExprF64Le);
  EXPECT_LENGTH(1, kExprF64Gt);
  EXPECT_LENGTH(1, kExprF64Ge);
  EXPECT_LENGTH(1, kExprI32SConvertF32);
  EXPECT_LENGTH(1, kExprI32SConvertF64);
  EXPECT_LENGTH(1, kExprI32UConvertF32);
  EXPECT_LENGTH(1, kExprI32UConvertF64);
  EXPECT_LENGTH(1, kExprI32ConvertI64);
  EXPECT_LENGTH(1, kExprI64SConvertF32);
  EXPECT_LENGTH(1, kExprI64SConvertF64);
  EXPECT_LENGTH(1, kExprI64UConvertF32);
  EXPECT_LENGTH(1, kExprI64UConvertF64);
  EXPECT_LENGTH(1, kExprI64SConvertI32);
  EXPECT_LENGTH(1, kExprI64UConvertI32);
  EXPECT_LENGTH(1, kExprF32SConvertI32);
  EXPECT_LENGTH(1, kExprF32UConvertI32);
  EXPECT_LENGTH(1, kExprF32SConvertI64);
  EXPECT_LENGTH(1, kExprF32UConvertI64);
  EXPECT_LENGTH(1, kExprF32ConvertF64);
  EXPECT_LENGTH(1, kExprF32ReinterpretI32);
  EXPECT_LENGTH(1, kExprF64SConvertI32);
  EXPECT_LENGTH(1, kExprF64UConvertI32);
  EXPECT_LENGTH(1, kExprF64SConvertI64);
  EXPECT_LENGTH(1, kExprF64UConvertI64);
  EXPECT_LENGTH(1, kExprF64ConvertF32);
  EXPECT_LENGTH(1, kExprF64ReinterpretI64);
  EXPECT_LENGTH(1, kExprI32ReinterpretF32);
  EXPECT_LENGTH(1, kExprI64ReinterpretF64);
}


class WasmOpcodeArityTest : public TestWithZone {
 public:
  WasmOpcodeArityTest() : TestWithZone() {}
};

#define EXPECT_ARITY(expected, ...)                                    \
  {                                                                    \
    static const byte code[] = {__VA_ARGS__};                          \
    EXPECT_EQ(expected, OpcodeArity(&env, code, code + sizeof(code))); \
  }

TEST_F(WasmOpcodeArityTest, Control) {
  FunctionEnv env;
  EXPECT_ARITY(0, kExprNop);

  EXPECT_ARITY(0, kExprBlock, 0);
  EXPECT_ARITY(1, kExprBlock, 1);
  EXPECT_ARITY(2, kExprBlock, 2);
  EXPECT_ARITY(5, kExprBlock, 5);
  EXPECT_ARITY(10, kExprBlock, 10);

  EXPECT_ARITY(0, kExprLoop, 0);
  EXPECT_ARITY(1, kExprLoop, 1);
  EXPECT_ARITY(2, kExprLoop, 2);
  EXPECT_ARITY(7, kExprLoop, 7);
  EXPECT_ARITY(11, kExprLoop, 11);

  EXPECT_ARITY(2, kExprIf);
  EXPECT_ARITY(3, kExprIfElse);
  EXPECT_ARITY(3, kExprSelect);

  EXPECT_ARITY(1, kExprBr);
  EXPECT_ARITY(2, kExprBrIf);

  {
    TestSignatures sigs;
    FunctionEnv env;
    WasmDecoderTest::init_env(&env, sigs.v_v());
    EXPECT_ARITY(0, kExprReturn);
    WasmDecoderTest::init_env(&env, sigs.i_i());
    EXPECT_ARITY(1, kExprReturn);
  }
}


TEST_F(WasmOpcodeArityTest, Misc) {
  FunctionEnv env;

  EXPECT_ARITY(0, kExprI8Const);
  EXPECT_ARITY(0, kExprI32Const);
  EXPECT_ARITY(0, kExprF32Const);
  EXPECT_ARITY(0, kExprI64Const);
  EXPECT_ARITY(0, kExprF64Const);
  EXPECT_ARITY(0, kExprGetLocal);
  EXPECT_ARITY(1, kExprSetLocal);
  EXPECT_ARITY(0, kExprLoadGlobal);
  EXPECT_ARITY(1, kExprStoreGlobal);
}


TEST_F(WasmOpcodeArityTest, Calls) {
  TestSignatures sigs;
  TestModuleEnv module;
  module.AddFunction(sigs.i_ii());
  module.AddFunction(sigs.i_i());

  module.AddSignature(sigs.f_ff());
  module.AddSignature(sigs.i_d());

  module.AddImport(sigs.f_ff());
  module.AddImport(sigs.i_d());

  {
    FunctionEnv env;
    WasmDecoderTest::init_env(&env, sigs.i_ii());
    env.module = &module;

    EXPECT_ARITY(2, kExprCallFunction, 0);
    EXPECT_ARITY(2, kExprCallImport, 0);
    EXPECT_ARITY(3, kExprCallIndirect, 0);
    EXPECT_ARITY(1, kExprBr);
    EXPECT_ARITY(2, kExprBrIf);
  }

  {
    FunctionEnv env;
    WasmDecoderTest::init_env(&env, sigs.v_v());
    env.module = &module;

    EXPECT_ARITY(1, kExprCallFunction, 1);
    EXPECT_ARITY(1, kExprCallImport, 1);
    EXPECT_ARITY(2, kExprCallIndirect, 1);
    EXPECT_ARITY(1, kExprBr);
    EXPECT_ARITY(2, kExprBrIf);
  }
}


TEST_F(WasmOpcodeArityTest, LoadsAndStores) {
  FunctionEnv env;

  EXPECT_ARITY(1, kExprI32LoadMem8S);
  EXPECT_ARITY(1, kExprI32LoadMem8U);
  EXPECT_ARITY(1, kExprI32LoadMem16S);
  EXPECT_ARITY(1, kExprI32LoadMem16U);
  EXPECT_ARITY(1, kExprI32LoadMem);

  EXPECT_ARITY(1, kExprI64LoadMem8S);
  EXPECT_ARITY(1, kExprI64LoadMem8U);
  EXPECT_ARITY(1, kExprI64LoadMem16S);
  EXPECT_ARITY(1, kExprI64LoadMem16U);
  EXPECT_ARITY(1, kExprI64LoadMem32S);
  EXPECT_ARITY(1, kExprI64LoadMem32U);
  EXPECT_ARITY(1, kExprI64LoadMem);
  EXPECT_ARITY(1, kExprF32LoadMem);
  EXPECT_ARITY(1, kExprF64LoadMem);

  EXPECT_ARITY(2, kExprI32StoreMem8);
  EXPECT_ARITY(2, kExprI32StoreMem16);
  EXPECT_ARITY(2, kExprI32StoreMem);
  EXPECT_ARITY(2, kExprI64StoreMem8);
  EXPECT_ARITY(2, kExprI64StoreMem16);
  EXPECT_ARITY(2, kExprI64StoreMem32);
  EXPECT_ARITY(2, kExprI64StoreMem);
  EXPECT_ARITY(2, kExprF32StoreMem);
  EXPECT_ARITY(2, kExprF64StoreMem);
}


TEST_F(WasmOpcodeArityTest, MiscMemExpressions) {
  FunctionEnv env;

  EXPECT_ARITY(0, kExprMemorySize);
  EXPECT_ARITY(1, kExprGrowMemory);
}


TEST_F(WasmOpcodeArityTest, SimpleExpressions) {
  FunctionEnv env;

  EXPECT_ARITY(2, kExprI32Add);
  EXPECT_ARITY(2, kExprI32Sub);
  EXPECT_ARITY(2, kExprI32Mul);
  EXPECT_ARITY(2, kExprI32DivS);
  EXPECT_ARITY(2, kExprI32DivU);
  EXPECT_ARITY(2, kExprI32RemS);
  EXPECT_ARITY(2, kExprI32RemU);
  EXPECT_ARITY(2, kExprI32And);
  EXPECT_ARITY(2, kExprI32Ior);
  EXPECT_ARITY(2, kExprI32Xor);
  EXPECT_ARITY(2, kExprI32Shl);
  EXPECT_ARITY(2, kExprI32ShrU);
  EXPECT_ARITY(2, kExprI32ShrS);
  EXPECT_ARITY(2, kExprI32Eq);
  EXPECT_ARITY(2, kExprI32Ne);
  EXPECT_ARITY(2, kExprI32LtS);
  EXPECT_ARITY(2, kExprI32LeS);
  EXPECT_ARITY(2, kExprI32LtU);
  EXPECT_ARITY(2, kExprI32LeU);
  EXPECT_ARITY(2, kExprI32GtS);
  EXPECT_ARITY(2, kExprI32GeS);
  EXPECT_ARITY(2, kExprI32GtU);
  EXPECT_ARITY(2, kExprI32GeU);
  EXPECT_ARITY(1, kExprI32Clz);
  EXPECT_ARITY(1, kExprI32Ctz);
  EXPECT_ARITY(1, kExprI32Popcnt);
  EXPECT_ARITY(1, kExprBoolNot);
  EXPECT_ARITY(2, kExprI64Add);
  EXPECT_ARITY(2, kExprI64Sub);
  EXPECT_ARITY(2, kExprI64Mul);
  EXPECT_ARITY(2, kExprI64DivS);
  EXPECT_ARITY(2, kExprI64DivU);
  EXPECT_ARITY(2, kExprI64RemS);
  EXPECT_ARITY(2, kExprI64RemU);
  EXPECT_ARITY(2, kExprI64And);
  EXPECT_ARITY(2, kExprI64Ior);
  EXPECT_ARITY(2, kExprI64Xor);
  EXPECT_ARITY(2, kExprI64Shl);
  EXPECT_ARITY(2, kExprI64ShrU);
  EXPECT_ARITY(2, kExprI64ShrS);
  EXPECT_ARITY(2, kExprI64Eq);
  EXPECT_ARITY(2, kExprI64Ne);
  EXPECT_ARITY(2, kExprI64LtS);
  EXPECT_ARITY(2, kExprI64LeS);
  EXPECT_ARITY(2, kExprI64LtU);
  EXPECT_ARITY(2, kExprI64LeU);
  EXPECT_ARITY(2, kExprI64GtS);
  EXPECT_ARITY(2, kExprI64GeS);
  EXPECT_ARITY(2, kExprI64GtU);
  EXPECT_ARITY(2, kExprI64GeU);
  EXPECT_ARITY(1, kExprI64Clz);
  EXPECT_ARITY(1, kExprI64Ctz);
  EXPECT_ARITY(1, kExprI64Popcnt);
  EXPECT_ARITY(2, kExprF32Add);
  EXPECT_ARITY(2, kExprF32Sub);
  EXPECT_ARITY(2, kExprF32Mul);
  EXPECT_ARITY(2, kExprF32Div);
  EXPECT_ARITY(2, kExprF32Min);
  EXPECT_ARITY(2, kExprF32Max);
  EXPECT_ARITY(1, kExprF32Abs);
  EXPECT_ARITY(1, kExprF32Neg);
  EXPECT_ARITY(2, kExprF32CopySign);
  EXPECT_ARITY(1, kExprF32Ceil);
  EXPECT_ARITY(1, kExprF32Floor);
  EXPECT_ARITY(1, kExprF32Trunc);
  EXPECT_ARITY(1, kExprF32NearestInt);
  EXPECT_ARITY(1, kExprF32Sqrt);
  EXPECT_ARITY(2, kExprF32Eq);
  EXPECT_ARITY(2, kExprF32Ne);
  EXPECT_ARITY(2, kExprF32Lt);
  EXPECT_ARITY(2, kExprF32Le);
  EXPECT_ARITY(2, kExprF32Gt);
  EXPECT_ARITY(2, kExprF32Ge);
  EXPECT_ARITY(2, kExprF64Add);
  EXPECT_ARITY(2, kExprF64Sub);
  EXPECT_ARITY(2, kExprF64Mul);
  EXPECT_ARITY(2, kExprF64Div);
  EXPECT_ARITY(2, kExprF64Min);
  EXPECT_ARITY(2, kExprF64Max);
  EXPECT_ARITY(1, kExprF64Abs);
  EXPECT_ARITY(1, kExprF64Neg);
  EXPECT_ARITY(2, kExprF64CopySign);
  EXPECT_ARITY(1, kExprF64Ceil);
  EXPECT_ARITY(1, kExprF64Floor);
  EXPECT_ARITY(1, kExprF64Trunc);
  EXPECT_ARITY(1, kExprF64NearestInt);
  EXPECT_ARITY(1, kExprF64Sqrt);
  EXPECT_ARITY(2, kExprF64Eq);
  EXPECT_ARITY(2, kExprF64Ne);
  EXPECT_ARITY(2, kExprF64Lt);
  EXPECT_ARITY(2, kExprF64Le);
  EXPECT_ARITY(2, kExprF64Gt);
  EXPECT_ARITY(2, kExprF64Ge);
  EXPECT_ARITY(1, kExprI32SConvertF32);
  EXPECT_ARITY(1, kExprI32SConvertF64);
  EXPECT_ARITY(1, kExprI32UConvertF32);
  EXPECT_ARITY(1, kExprI32UConvertF64);
  EXPECT_ARITY(1, kExprI32ConvertI64);
  EXPECT_ARITY(1, kExprI64SConvertF32);
  EXPECT_ARITY(1, kExprI64SConvertF64);
  EXPECT_ARITY(1, kExprI64UConvertF32);
  EXPECT_ARITY(1, kExprI64UConvertF64);
  EXPECT_ARITY(1, kExprI64SConvertI32);
  EXPECT_ARITY(1, kExprI64UConvertI32);
  EXPECT_ARITY(1, kExprF32SConvertI32);
  EXPECT_ARITY(1, kExprF32UConvertI32);
  EXPECT_ARITY(1, kExprF32SConvertI64);
  EXPECT_ARITY(1, kExprF32UConvertI64);
  EXPECT_ARITY(1, kExprF32ConvertF64);
  EXPECT_ARITY(1, kExprF32ReinterpretI32);
  EXPECT_ARITY(1, kExprF64SConvertI32);
  EXPECT_ARITY(1, kExprF64UConvertI32);
  EXPECT_ARITY(1, kExprF64SConvertI64);
  EXPECT_ARITY(1, kExprF64UConvertI64);
  EXPECT_ARITY(1, kExprF64ConvertF32);
  EXPECT_ARITY(1, kExprF64ReinterpretI64);
  EXPECT_ARITY(1, kExprI32ReinterpretF32);
  EXPECT_ARITY(1, kExprI64ReinterpretF64);
}
}  // namespace wasm
}  // namespace internal
}  // namespace v8