// 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.

// Flags: --expose-wasm

function bytes() {
  var buffer = new ArrayBuffer(arguments.length);
  var view = new Uint8Array(buffer);
  for (var i = 0; i < arguments.length; i++) {
    var val = arguments[i];
    if ((typeof val) == "string") val = val.charCodeAt(0);
    view[i] = val | 0;
  }
  return buffer;
}

// V8 internal constants
var kV8MaxPages = 32767;

// Header declaration constants
var kWasmH0 = 0;
var kWasmH1 = 0x61;
var kWasmH2 = 0x73;
var kWasmH3 = 0x6d;

var kWasmV0 = 0x1;
var kWasmV1 = 0;
var kWasmV2 = 0;
var kWasmV3 = 0;

var kHeaderSize = 8;
var kPageSize = 65536;
var kSpecMaxPages = 65535;

function bytesWithHeader() {
  var buffer = new ArrayBuffer(kHeaderSize + arguments.length);
  var view = new Uint8Array(buffer);
  view[0] = kWasmH0;
  view[1] = kWasmH1;
  view[2] = kWasmH2;
  view[3] = kWasmH3;
  view[4] = kWasmV0;
  view[5] = kWasmV1;
  view[6] = kWasmV2;
  view[7] = kWasmV3;
  for (var i = 0; i < arguments.length; i++) {
    var val = arguments[i];
    if ((typeof val) == "string") val = val.charCodeAt(0);
    view[kHeaderSize + i] = val | 0;
  }
  return buffer;
}

let kDeclNoLocals = 0;

// Section declaration constants
let kUnknownSectionCode = 0;
let kTypeSectionCode = 1;        // Function signature declarations
let kImportSectionCode = 2;      // Import declarations
let kFunctionSectionCode = 3;    // Function declarations
let kTableSectionCode = 4;       // Indirect function table and other tables
let kMemorySectionCode = 5;      // Memory attributes
let kGlobalSectionCode = 6;      // Global declarations
let kExportSectionCode = 7;      // Exports
let kStartSectionCode = 8;       // Start function declaration
let kElementSectionCode = 9;     // Elements section
let kCodeSectionCode = 10;       // Function code
let kDataSectionCode = 11;       // Data segments
let kNameSectionCode = 12;       // Name section (encoded as string)
let kExceptionSectionCode = 13;  // Exception section (must appear before code section)

// Name section types
let kModuleNameCode = 0;
let kFunctionNamesCode = 1;
let kLocalNamesCode = 2;

let kWasmFunctionTypeForm = 0x60;
let kWasmAnyFunctionTypeForm = 0x70;

let kHasMaximumFlag = 1;

// Function declaration flags
let kDeclFunctionName   = 0x01;
let kDeclFunctionImport = 0x02;
let kDeclFunctionLocals = 0x04;
let kDeclFunctionExport = 0x08;

// Local types
let kWasmStmt = 0x40;
let kWasmI32 = 0x7f;
let kWasmI64 = 0x7e;
let kWasmF32 = 0x7d;
let kWasmF64 = 0x7c;
let kWasmS128  = 0x7b;

let kExternalFunction = 0;
let kExternalTable = 1;
let kExternalMemory = 2;
let kExternalGlobal = 3;

let kTableZero = 0;
let kMemoryZero = 0;

// Useful signatures
let kSig_i_i = makeSig([kWasmI32], [kWasmI32]);
let kSig_l_l = makeSig([kWasmI64], [kWasmI64]);
let kSig_i_l = makeSig([kWasmI64], [kWasmI32]);
let kSig_i_ii = makeSig([kWasmI32, kWasmI32], [kWasmI32]);
let kSig_i_iii = makeSig([kWasmI32, kWasmI32, kWasmI32], [kWasmI32]);
let kSig_d_dd = makeSig([kWasmF64, kWasmF64], [kWasmF64]);
let kSig_l_ll = makeSig([kWasmI64, kWasmI64], [kWasmI64]);
let kSig_i_dd = makeSig([kWasmF64, kWasmF64], [kWasmI32]);
let kSig_v_v = makeSig([], []);
let kSig_i_v = makeSig([], [kWasmI32]);
let kSig_l_v = makeSig([], [kWasmI64]);
let kSig_f_v = makeSig([], [kWasmF64]);
let kSig_d_v = makeSig([], [kWasmF64]);
let kSig_v_i = makeSig([kWasmI32], []);
let kSig_v_ii = makeSig([kWasmI32, kWasmI32], []);
let kSig_v_iii = makeSig([kWasmI32, kWasmI32, kWasmI32], []);
let kSig_v_l = makeSig([kWasmI64], []);
let kSig_v_d = makeSig([kWasmF64], []);
let kSig_v_dd = makeSig([kWasmF64, kWasmF64], []);
let kSig_v_ddi = makeSig([kWasmF64, kWasmF64, kWasmI32], []);
let kSig_ii_v = makeSig([], [kWasmI32, kWasmI32]);
let kSig_iii_v = makeSig([], [kWasmI32, kWasmI32, kWasmI32]);
let kSig_ii_i = makeSig([kWasmI32], [kWasmI32, kWasmI32]);
let kSig_iii_i = makeSig([kWasmI32], [kWasmI32, kWasmI32, kWasmI32]);
let kSig_ii_ii = makeSig([kWasmI32, kWasmI32], [kWasmI32, kWasmI32]);
let kSig_iii_ii = makeSig([kWasmI32, kWasmI32], [kWasmI32, kWasmI32, kWasmI32]);

let kSig_v_f = makeSig([kWasmF32], []);
let kSig_f_f = makeSig([kWasmF32], [kWasmF32]);
let kSig_d_d = makeSig([kWasmF64], [kWasmF64]);

function makeSig(params, results) {
  return {params: params, results: results};
}

function makeSig_v_x(x) {
  return makeSig([x], []);
}

function makeSig_v_xx(x) {
  return makeSig([x, x], []);
}

function makeSig_r_v(r) {
  return makeSig([], [r]);
}

function makeSig_r_x(r, x) {
  return makeSig([x], [r]);
}

function makeSig_r_xx(r, x) {
  return makeSig([x, x], [r]);
}

// Opcodes
let kExprUnreachable = 0x00;
let kExprNop = 0x01;
let kExprBlock = 0x02;
let kExprLoop = 0x03;
let kExprIf = 0x04;
let kExprElse = 0x05;
let kExprTry = 0x06;
let kExprCatch = 0x07;
let kExprThrow = 0x08;
let kExprEnd = 0x0b;
let kExprBr = 0x0c;
let kExprBrIf = 0x0d;
let kExprBrTable = 0x0e;
let kExprReturn = 0x0f;
let kExprCallFunction = 0x10;
let kExprCallIndirect = 0x11;
let kExprDrop = 0x1a;
let kExprSelect = 0x1b;
let kExprGetLocal = 0x20;
let kExprSetLocal = 0x21;
let kExprTeeLocal = 0x22;
let kExprGetGlobal = 0x23;
let kExprSetGlobal = 0x24;
let kExprI32Const = 0x41;
let kExprI64Const = 0x42;
let kExprF32Const = 0x43;
let kExprF64Const = 0x44;
let kExprI32LoadMem = 0x28;
let kExprI64LoadMem = 0x29;
let kExprF32LoadMem = 0x2a;
let kExprF64LoadMem = 0x2b;
let kExprI32LoadMem8S = 0x2c;
let kExprI32LoadMem8U = 0x2d;
let kExprI32LoadMem16S = 0x2e;
let kExprI32LoadMem16U = 0x2f;
let kExprI64LoadMem8S = 0x30;
let kExprI64LoadMem8U = 0x31;
let kExprI64LoadMem16S = 0x32;
let kExprI64LoadMem16U = 0x33;
let kExprI64LoadMem32S = 0x34;
let kExprI64LoadMem32U = 0x35;
let kExprI32StoreMem = 0x36;
let kExprI64StoreMem = 0x37;
let kExprF32StoreMem = 0x38;
let kExprF64StoreMem = 0x39;
let kExprI32StoreMem8 = 0x3a;
let kExprI32StoreMem16 = 0x3b;
let kExprI64StoreMem8 = 0x3c;
let kExprI64StoreMem16 = 0x3d;
let kExprI64StoreMem32 = 0x3e;
let kExprMemorySize = 0x3f;
let kExprGrowMemory = 0x40;
let kExprI32Eqz = 0x45;
let kExprI32Eq = 0x46;
let kExprI32Ne = 0x47;
let kExprI32LtS = 0x48;
let kExprI32LtU = 0x49;
let kExprI32GtS = 0x4a;
let kExprI32GtU = 0x4b;
let kExprI32LeS = 0x4c;
let kExprI32LeU = 0x4d;
let kExprI32GeS = 0x4e;
let kExprI32GeU = 0x4f;
let kExprI64Eqz = 0x50;
let kExprI64Eq = 0x51;
let kExprI64Ne = 0x52;
let kExprI64LtS = 0x53;
let kExprI64LtU = 0x54;
let kExprI64GtS = 0x55;
let kExprI64GtU = 0x56;
let kExprI64LeS = 0x57;
let kExprI64LeU = 0x58;
let kExprI64GeS = 0x59;
let kExprI64GeU = 0x5a;
let kExprF32Eq = 0x5b;
let kExprF32Ne = 0x5c;
let kExprF32Lt = 0x5d;
let kExprF32Gt = 0x5e;
let kExprF32Le = 0x5f;
let kExprF32Ge = 0x60;
let kExprF64Eq = 0x61;
let kExprF64Ne = 0x62;
let kExprF64Lt = 0x63;
let kExprF64Gt = 0x64;
let kExprF64Le = 0x65;
let kExprF64Ge = 0x66;
let kExprI32Clz = 0x67;
let kExprI32Ctz = 0x68;
let kExprI32Popcnt = 0x69;
let kExprI32Add = 0x6a;
let kExprI32Sub = 0x6b;
let kExprI32Mul = 0x6c;
let kExprI32DivS = 0x6d;
let kExprI32DivU = 0x6e;
let kExprI32RemS = 0x6f;
let kExprI32RemU = 0x70;
let kExprI32And = 0x71;
let kExprI32Ior = 0x72;
let kExprI32Xor = 0x73;
let kExprI32Shl = 0x74;
let kExprI32ShrS = 0x75;
let kExprI32ShrU = 0x76;
let kExprI32Rol = 0x77;
let kExprI32Ror = 0x78;
let kExprI64Clz = 0x79;
let kExprI64Ctz = 0x7a;
let kExprI64Popcnt = 0x7b;
let kExprI64Add = 0x7c;
let kExprI64Sub = 0x7d;
let kExprI64Mul = 0x7e;
let kExprI64DivS = 0x7f;
let kExprI64DivU = 0x80;
let kExprI64RemS = 0x81;
let kExprI64RemU = 0x82;
let kExprI64And = 0x83;
let kExprI64Ior = 0x84;
let kExprI64Xor = 0x85;
let kExprI64Shl = 0x86;
let kExprI64ShrS = 0x87;
let kExprI64ShrU = 0x88;
let kExprI64Rol = 0x89;
let kExprI64Ror = 0x8a;
let kExprF32Abs = 0x8b;
let kExprF32Neg = 0x8c;
let kExprF32Ceil = 0x8d;
let kExprF32Floor = 0x8e;
let kExprF32Trunc = 0x8f;
let kExprF32NearestInt = 0x90;
let kExprF32Sqrt = 0x91;
let kExprF32Add = 0x92;
let kExprF32Sub = 0x93;
let kExprF32Mul = 0x94;
let kExprF32Div = 0x95;
let kExprF32Min = 0x96;
let kExprF32Max = 0x97;
let kExprF32CopySign = 0x98;
let kExprF64Abs = 0x99;
let kExprF64Neg = 0x9a;
let kExprF64Ceil = 0x9b;
let kExprF64Floor = 0x9c;
let kExprF64Trunc = 0x9d;
let kExprF64NearestInt = 0x9e;
let kExprF64Sqrt = 0x9f;
let kExprF64Add = 0xa0;
let kExprF64Sub = 0xa1;
let kExprF64Mul = 0xa2;
let kExprF64Div = 0xa3;
let kExprF64Min = 0xa4;
let kExprF64Max = 0xa5;
let kExprF64CopySign = 0xa6;
let kExprI32ConvertI64 = 0xa7;
let kExprI32SConvertF32 = 0xa8;
let kExprI32UConvertF32 = 0xa9;
let kExprI32SConvertF64 = 0xaa;
let kExprI32UConvertF64 = 0xab;
let kExprI64SConvertI32 = 0xac;
let kExprI64UConvertI32 = 0xad;
let kExprI64SConvertF32 = 0xae;
let kExprI64UConvertF32 = 0xaf;
let kExprI64SConvertF64 = 0xb0;
let kExprI64UConvertF64 = 0xb1;
let kExprF32SConvertI32 = 0xb2;
let kExprF32UConvertI32 = 0xb3;
let kExprF32SConvertI64 = 0xb4;
let kExprF32UConvertI64 = 0xb5;
let kExprF32ConvertF64 = 0xb6;
let kExprF64SConvertI32 = 0xb7;
let kExprF64UConvertI32 = 0xb8;
let kExprF64SConvertI64 = 0xb9;
let kExprF64UConvertI64 = 0xba;
let kExprF64ConvertF32 = 0xbb;
let kExprI32ReinterpretF32 = 0xbc;
let kExprI64ReinterpretF64 = 0xbd;
let kExprF32ReinterpretI32 = 0xbe;
let kExprF64ReinterpretI64 = 0xbf;

// Prefix opcodes
let kAtomicPrefix = 0xfe;

let kExprI32AtomicLoad = 0x10;
let kExprI32AtomicLoad8U = 0x12;
let kExprI32AtomicLoad16U = 0x13;
let kExprI32AtomicStore = 0x17;
let kExprI32AtomicStore8U = 0x19;
let kExprI32AtomicStore16U = 0x1a;
let kExprI32AtomicAdd = 0x1e;
let kExprI32AtomicAdd8U = 0x20;
let kExprI32AtomicAdd16U = 0x21;
let kExprI32AtomicSub = 0x25;
let kExprI32AtomicSub8U = 0x27;
let kExprI32AtomicSub16U = 0x28;
let kExprI32AtomicAnd = 0x2c;
let kExprI32AtomicAnd8U = 0x2e;
let kExprI32AtomicAnd16U = 0x2f;
let kExprI32AtomicOr = 0x33;
let kExprI32AtomicOr8U = 0x35;
let kExprI32AtomicOr16U = 0x36;
let kExprI32AtomicXor = 0x3a;
let kExprI32AtomicXor8U = 0x3c;
let kExprI32AtomicXor16U = 0x3d;
let kExprI32AtomicExchange = 0x41;
let kExprI32AtomicExchange8U = 0x43;
let kExprI32AtomicExchange16U = 0x44;
let kExprI32AtomicCompareExchange = 0x48
let kExprI32AtomicCompareExchange8U = 0x4a
let kExprI32AtomicCompareExchange16U = 0x4b

let kTrapUnreachable          = 0;
let kTrapMemOutOfBounds       = 1;
let kTrapDivByZero            = 2;
let kTrapDivUnrepresentable   = 3;
let kTrapRemByZero            = 4;
let kTrapFloatUnrepresentable = 5;
let kTrapFuncInvalid          = 6;
let kTrapFuncSigMismatch      = 7;
let kTrapInvalidIndex         = 8;

let kTrapMsgs = [
  "unreachable",
  "memory access out of bounds",
  "divide by zero",
  "divide result unrepresentable",
  "remainder by zero",
  "integer result unrepresentable",
  "invalid function",
  "function signature mismatch",
  "invalid index into function table"
];

function assertTraps(trap, code) {
  try {
    if (typeof code === 'function') {
      code();
    } else {
      eval(code);
    }
  } catch (e) {
    assertEquals('object', typeof e);
    assertEquals(kTrapMsgs[trap], e.message);
    // Success.
    return;
  }
  throw new MjsUnitAssertionError('Did not trap, expected: ' + kTrapMsgs[trap]);
}

function assertWasmThrows(runtime_id, values, code) {
  try {
    if (typeof code === 'function') {
      code();
    } else {
      eval(code);
    }
  } catch (e) {
    assertTrue(e instanceof WebAssembly.RuntimeError);
    var e_runtime_id = e['WasmExceptionRuntimeId'];
    assertEquals(e_runtime_id, runtime_id);
    assertTrue(Number.isInteger(e_runtime_id));
    var e_values = e['WasmExceptionValues'];
    assertEquals(values.length, e_values.length);
    for (i = 0; i < values.length; ++i) {
      assertEquals(values[i], e_values[i]);
    }
    // Success.
    return;
  }
  throw new MjsUnitAssertionError('Did not throw expected: ' + runtime_id + values);
}

function wasmI32Const(val) {
  let bytes = [kExprI32Const];
  for (let i = 0; i < 4; ++i) {
    bytes.push(0x80 | ((val >> (7 * i)) & 0x7f));
  }
  bytes.push((val >> (7 * 4)) & 0x7f);
  return bytes;
}

function wasmF32Const(f) {
  return [kExprF32Const].concat(Array.from(new Uint8Array((new Float32Array([f])).buffer)));
}

function wasmF64Const(f) {
  return [kExprF64Const].concat(Array.from(new Uint8Array((new Float64Array([f])).buffer)));
}