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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2015 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_constants_h
+#define wasm_constants_h
+
+#include <stdint.h>
+
+#include "wasm/WasmIntrinsicGenerated.h"
+
+namespace js {
+namespace wasm {
+
+static const uint32_t MagicNumber = 0x6d736100; // "\0asm"
+static const uint32_t EncodingVersion = 0x01;
+
+enum class SectionId {
+ Custom = 0,
+ Type = 1,
+ Import = 2,
+ Function = 3,
+ Table = 4,
+ Memory = 5,
+ Global = 6,
+ Export = 7,
+ Start = 8,
+ Elem = 9,
+ Code = 10,
+ Data = 11,
+ DataCount = 12,
+ Tag = 13,
+};
+
+// WebAssembly type encodings are all single-byte negative SLEB128s, hence:
+// forall tc:TypeCode. ((tc & SLEB128SignMask) == SLEB128SignBit
+static const uint8_t SLEB128SignMask = 0xc0;
+static const uint8_t SLEB128SignBit = 0x40;
+
+enum class TypeCode {
+
+ // If more "simple primitive" (non-reference, non-constructor,
+ // non-special-purpose) types are added here then you MUST update
+ // LowestPrimitiveTypeCode, below.
+
+ I32 = 0x7f, // SLEB128(-0x01)
+ I64 = 0x7e, // SLEB128(-0x02)
+ F32 = 0x7d, // SLEB128(-0x03)
+ F64 = 0x7c, // SLEB128(-0x04)
+ V128 = 0x7b, // SLEB128(-0x05)
+
+ I8 = 0x7a, // SLEB128(-0x06)
+ I16 = 0x79, // SLEB128(-0x07)
+
+ // A function pointer with any signature
+ FuncRef = 0x70, // SLEB128(-0x10)
+
+ // A reference to any host value.
+ ExternRef = 0x6f, // SLEB128(-0x11)
+
+ // A reference to any wasm gc value.
+ AnyRef = 0x6e, // SLEB128(-0x12)
+
+ // A reference to a struct/array value.
+ EqRef = 0x6d, // SLEB128(-0x13)
+
+ // Type constructor for nullable reference types.
+ NullableRef = 0x6c, // SLEB128(-0x14)
+
+ // Type constructor for non-nullable reference types.
+ Ref = 0x6b, // SLEB128(-0x15)
+
+ // A null reference in the extern hierarchy.
+ NullExternRef = 0x69, // SLEB128(-0x17)
+
+ // A null reference in the func hierarchy.
+ NullFuncRef = 0x68, // SLEB128(-0x18)
+
+ // A reference to any struct value.
+ StructRef = 0x67, // SLEB128(-0x19)
+
+ // A reference to any array value.
+ ArrayRef = 0x66, // SLEB128(-0x1A)
+
+ // A null reference in the any hierarchy.
+ NullAnyRef = 0x65, // SLEB128(-0x1B)
+
+ // Type constructor for function types
+ Func = 0x60, // SLEB128(-0x20)
+
+ // Type constructor for structure types - gc proposal
+ Struct = 0x5f, // SLEB128(-0x21)
+
+ // Type constructor for array types - gc proposal
+ Array = 0x5e, // SLEB128(-0x22)
+
+ // Value for non-nullable type present.
+ TableHasInitExpr = 0x40,
+
+ // The 'empty' case of blocktype.
+ BlockVoid = 0x40, // SLEB128(-0x40)
+
+ // Type constructor for recursion groups - gc proposal
+ RecGroup = 0x4f,
+
+ // TODO: update wasm-tools to use the correct prefix
+ RecGroupOld = 0x45,
+
+ // Type prefix for parent types - gc proposal
+ SubType = 0x50,
+
+ Limit = 0x80
+};
+
+// This is the lowest-valued TypeCode that is a primitive type, used in
+// UnpackTypeCodeTypeAbstracted(). If primitive typecodes are added below any
+// reference typecode then the logic in that function MUST change.
+
+static constexpr TypeCode LowestPrimitiveTypeCode = TypeCode::I16;
+
+// An arbitrary reference type used as the result of
+// UnpackTypeCodeTypeAbstracted() when a value type is a reference.
+
+static constexpr TypeCode AbstractReferenceTypeCode = TypeCode::ExternRef;
+
+// A type code used to represent (ref null? T) whether or not the type
+// is encoded with 'Ref' or 'NullableRef'.
+
+static constexpr TypeCode AbstractTypeRefCode = TypeCode::Ref;
+
+// A wasm::Trap represents a wasm-defined trap that can occur during execution
+// which triggers a WebAssembly.RuntimeError. Generated code may jump to a Trap
+// symbolically, passing the bytecode offset to report as the trap offset. The
+// generated jump will be bound to a tiny stub which fills the offset and
+// then jumps to a per-Trap shared stub at the end of the module.
+
+enum class Trap {
+ // The Unreachable opcode has been executed.
+ Unreachable,
+ // An integer arithmetic operation led to an overflow.
+ IntegerOverflow,
+ // Trying to coerce NaN to an integer.
+ InvalidConversionToInteger,
+ // Integer division by zero.
+ IntegerDivideByZero,
+ // Out of bounds on wasm memory accesses.
+ OutOfBounds,
+ // Unaligned on wasm atomic accesses; also used for non-standard ARM
+ // unaligned access faults.
+ UnalignedAccess,
+ // call_indirect to null.
+ IndirectCallToNull,
+ // call_indirect signature mismatch.
+ IndirectCallBadSig,
+ // Dereference null pointer in operation on (Ref T)
+ NullPointerDereference,
+ // Failed to cast a (Ref T) in a ref.cast instruction
+ BadCast,
+
+ // The internal stack space was exhausted. For compatibility, this throws
+ // the same over-recursed error as JS.
+ StackOverflow,
+
+ // The wasm execution has potentially run too long and the engine must call
+ // CheckForInterrupt(). This trap is resumable.
+ CheckInterrupt,
+
+ // Signal an error that was reported in C++ code.
+ ThrowReported,
+
+ Limit
+};
+
+// The representation of a null reference value throughout the compiler.
+
+static const intptr_t NULLREF_VALUE = intptr_t((void*)nullptr);
+
+enum class DefinitionKind {
+ Function = 0x00,
+ Table = 0x01,
+ Memory = 0x02,
+ Global = 0x03,
+ Tag = 0x04,
+};
+
+enum class GlobalTypeImmediate { IsMutable = 0x1, AllowedMask = 0x1 };
+
+enum class LimitsFlags {
+ Default = 0x0,
+ HasMaximum = 0x1,
+ IsShared = 0x2,
+ IsI64 = 0x4,
+};
+
+enum class LimitsMask {
+ Table = uint8_t(LimitsFlags::HasMaximum),
+#ifdef ENABLE_WASM_MEMORY64
+ Memory = uint8_t(LimitsFlags::HasMaximum) | uint8_t(LimitsFlags::IsShared) |
+ uint8_t(LimitsFlags::IsI64),
+#else
+ Memory = uint8_t(LimitsFlags::HasMaximum) | uint8_t(LimitsFlags::IsShared),
+#endif
+};
+
+enum class DataSegmentKind {
+ Active = 0x00,
+ Passive = 0x01,
+ ActiveWithMemoryIndex = 0x02
+};
+
+enum class ElemSegmentKind : uint32_t {
+ Active = 0x0,
+ Passive = 0x1,
+ ActiveWithTableIndex = 0x2,
+ Declared = 0x3,
+};
+
+enum class ElemSegmentPayload : uint32_t {
+ ExternIndex = 0x0,
+ ElemExpression = 0x4,
+};
+
+enum class TagKind {
+ Exception = 0x0,
+};
+
+enum class Op {
+ // Control flow operators
+ Unreachable = 0x00,
+ Nop = 0x01,
+ Block = 0x02,
+ Loop = 0x03,
+ If = 0x04,
+ Else = 0x05,
+ Try = 0x06,
+ Catch = 0x07,
+ Throw = 0x08,
+ Rethrow = 0x09,
+ End = 0x0b,
+ Br = 0x0c,
+ BrIf = 0x0d,
+ BrTable = 0x0e,
+ Return = 0x0f,
+
+ // Call operators
+ Call = 0x10,
+ CallIndirect = 0x11,
+ CallRef = 0x14,
+
+ // Additional exception operators
+ Delegate = 0x18,
+ CatchAll = 0x19,
+
+ // Parametric operators
+ Drop = 0x1a,
+ SelectNumeric = 0x1b,
+ SelectTyped = 0x1c,
+
+ // Variable access
+ LocalGet = 0x20,
+ LocalSet = 0x21,
+ LocalTee = 0x22,
+ GlobalGet = 0x23,
+ GlobalSet = 0x24,
+ TableGet = 0x25, // Reftypes,
+ TableSet = 0x26, // per proposal as of February 2019
+
+ // Memory-related operators
+ I32Load = 0x28,
+ I64Load = 0x29,
+ F32Load = 0x2a,
+ F64Load = 0x2b,
+ I32Load8S = 0x2c,
+ I32Load8U = 0x2d,
+ I32Load16S = 0x2e,
+ I32Load16U = 0x2f,
+ I64Load8S = 0x30,
+ I64Load8U = 0x31,
+ I64Load16S = 0x32,
+ I64Load16U = 0x33,
+ I64Load32S = 0x34,
+ I64Load32U = 0x35,
+ I32Store = 0x36,
+ I64Store = 0x37,
+ F32Store = 0x38,
+ F64Store = 0x39,
+ I32Store8 = 0x3a,
+ I32Store16 = 0x3b,
+ I64Store8 = 0x3c,
+ I64Store16 = 0x3d,
+ I64Store32 = 0x3e,
+ MemorySize = 0x3f,
+ MemoryGrow = 0x40,
+
+ // Constants
+ I32Const = 0x41,
+ I64Const = 0x42,
+ F32Const = 0x43,
+ F64Const = 0x44,
+
+ // Comparison operators
+ I32Eqz = 0x45,
+ I32Eq = 0x46,
+ I32Ne = 0x47,
+ I32LtS = 0x48,
+ I32LtU = 0x49,
+ I32GtS = 0x4a,
+ I32GtU = 0x4b,
+ I32LeS = 0x4c,
+ I32LeU = 0x4d,
+ I32GeS = 0x4e,
+ I32GeU = 0x4f,
+ I64Eqz = 0x50,
+ I64Eq = 0x51,
+ I64Ne = 0x52,
+ I64LtS = 0x53,
+ I64LtU = 0x54,
+ I64GtS = 0x55,
+ I64GtU = 0x56,
+ I64LeS = 0x57,
+ I64LeU = 0x58,
+ I64GeS = 0x59,
+ I64GeU = 0x5a,
+ F32Eq = 0x5b,
+ F32Ne = 0x5c,
+ F32Lt = 0x5d,
+ F32Gt = 0x5e,
+ F32Le = 0x5f,
+ F32Ge = 0x60,
+ F64Eq = 0x61,
+ F64Ne = 0x62,
+ F64Lt = 0x63,
+ F64Gt = 0x64,
+ F64Le = 0x65,
+ F64Ge = 0x66,
+
+ // Numeric operators
+ I32Clz = 0x67,
+ I32Ctz = 0x68,
+ I32Popcnt = 0x69,
+ I32Add = 0x6a,
+ I32Sub = 0x6b,
+ I32Mul = 0x6c,
+ I32DivS = 0x6d,
+ I32DivU = 0x6e,
+ I32RemS = 0x6f,
+ I32RemU = 0x70,
+ I32And = 0x71,
+ I32Or = 0x72,
+ I32Xor = 0x73,
+ I32Shl = 0x74,
+ I32ShrS = 0x75,
+ I32ShrU = 0x76,
+ I32Rotl = 0x77,
+ I32Rotr = 0x78,
+ I64Clz = 0x79,
+ I64Ctz = 0x7a,
+ I64Popcnt = 0x7b,
+ I64Add = 0x7c,
+ I64Sub = 0x7d,
+ I64Mul = 0x7e,
+ I64DivS = 0x7f,
+ I64DivU = 0x80,
+ I64RemS = 0x81,
+ I64RemU = 0x82,
+ I64And = 0x83,
+ I64Or = 0x84,
+ I64Xor = 0x85,
+ I64Shl = 0x86,
+ I64ShrS = 0x87,
+ I64ShrU = 0x88,
+ I64Rotl = 0x89,
+ I64Rotr = 0x8a,
+ F32Abs = 0x8b,
+ F32Neg = 0x8c,
+ F32Ceil = 0x8d,
+ F32Floor = 0x8e,
+ F32Trunc = 0x8f,
+ F32Nearest = 0x90,
+ F32Sqrt = 0x91,
+ F32Add = 0x92,
+ F32Sub = 0x93,
+ F32Mul = 0x94,
+ F32Div = 0x95,
+ F32Min = 0x96,
+ F32Max = 0x97,
+ F32CopySign = 0x98,
+ F64Abs = 0x99,
+ F64Neg = 0x9a,
+ F64Ceil = 0x9b,
+ F64Floor = 0x9c,
+ F64Trunc = 0x9d,
+ F64Nearest = 0x9e,
+ F64Sqrt = 0x9f,
+ F64Add = 0xa0,
+ F64Sub = 0xa1,
+ F64Mul = 0xa2,
+ F64Div = 0xa3,
+ F64Min = 0xa4,
+ F64Max = 0xa5,
+ F64CopySign = 0xa6,
+
+ // Conversions
+ I32WrapI64 = 0xa7,
+ I32TruncF32S = 0xa8,
+ I32TruncF32U = 0xa9,
+ I32TruncF64S = 0xaa,
+ I32TruncF64U = 0xab,
+ I64ExtendI32S = 0xac,
+ I64ExtendI32U = 0xad,
+ I64TruncF32S = 0xae,
+ I64TruncF32U = 0xaf,
+ I64TruncF64S = 0xb0,
+ I64TruncF64U = 0xb1,
+ F32ConvertI32S = 0xb2,
+ F32ConvertI32U = 0xb3,
+ F32ConvertI64S = 0xb4,
+ F32ConvertI64U = 0xb5,
+ F32DemoteF64 = 0xb6,
+ F64ConvertI32S = 0xb7,
+ F64ConvertI32U = 0xb8,
+ F64ConvertI64S = 0xb9,
+ F64ConvertI64U = 0xba,
+ F64PromoteF32 = 0xbb,
+
+ // Reinterpretations
+ I32ReinterpretF32 = 0xbc,
+ I64ReinterpretF64 = 0xbd,
+ F32ReinterpretI32 = 0xbe,
+ F64ReinterpretI64 = 0xbf,
+
+ // Sign extension
+ I32Extend8S = 0xc0,
+ I32Extend16S = 0xc1,
+ I64Extend8S = 0xc2,
+ I64Extend16S = 0xc3,
+ I64Extend32S = 0xc4,
+
+ // Reference types
+ RefNull = 0xd0,
+ RefIsNull = 0xd1,
+ RefFunc = 0xd2,
+
+ // Function references
+ RefAsNonNull = 0xd3,
+ BrOnNull = 0xd4,
+
+ // GC (experimental)
+ RefEq = 0xd5,
+
+ // Function references
+ BrOnNonNull = 0xd6,
+
+ FirstPrefix = 0xfa,
+ GcPrefix = 0xfb,
+ MiscPrefix = 0xfc,
+ SimdPrefix = 0xfd,
+ ThreadPrefix = 0xfe,
+ MozPrefix = 0xff,
+
+ Limit = 0x100
+};
+
+inline bool IsPrefixByte(uint8_t b) { return b >= uint8_t(Op::FirstPrefix); }
+
+// Opcodes in the GC opcode space.
+enum class GcOp {
+ // Structure operations
+ StructNew = 0x7,
+ StructNewDefault = 0x8,
+ StructGet = 0x03,
+ StructGetS = 0x04,
+ StructGetU = 0x05,
+ StructSet = 0x06,
+
+ // Array operations
+ ArrayNew = 0x1b,
+ ArrayNewFixed = 0x1a,
+ ArrayNewDefault = 0x1c,
+ ArrayNewData = 0x1d,
+ // array.init_from_elem_static in V5 became array.new_elem in V6, changing
+ // opcodes in the process
+ ArrayInitFromElemStaticV5 = 0x10,
+ ArrayNewElem = 0x1f,
+ ArrayGet = 0x13,
+ ArrayGetS = 0x14,
+ ArrayGetU = 0x15,
+ ArraySet = 0x16,
+ ArrayLenWithTypeIndex = 0x17,
+ ArrayCopy = 0x18,
+ ArrayLen = 0x19,
+
+ // Ref operations
+ RefTestV5 = 0x44,
+ RefCastV5 = 0x45,
+ BrOnCastV5 = 0x46,
+ BrOnCastHeapV5 = 0x42,
+ BrOnCastHeapNullV5 = 0x4a,
+ BrOnCastFailV5 = 0x47,
+ BrOnCastFailHeapV5 = 0x43,
+ BrOnCastFailHeapNullV5 = 0x4b,
+ RefTest = 0x40,
+ RefCast = 0x41,
+ RefTestNull = 0x48,
+ RefCastNull = 0x49,
+ BrOnCast = 0x4f,
+
+ // Dart compatibility instruction
+ RefAsStructV5 = 0x59,
+ BrOnNonStructV5 = 0x64,
+
+ // Extern/any coercion operations
+ ExternInternalize = 0x70,
+ ExternExternalize = 0x71,
+
+ Limit
+};
+
+// Opcode list from the SIMD proposal post-renumbering in May, 2020.
+
+// Opcodes with suffix 'Experimental' are proposed but not standardized, and are
+// compatible with those same opcodes in V8. No opcode labeled 'Experimental'
+// will ship in a Release build where SIMD is enabled by default.
+
+enum class SimdOp {
+ V128Load = 0x00,
+ V128Load8x8S = 0x01,
+ V128Load8x8U = 0x02,
+ V128Load16x4S = 0x03,
+ V128Load16x4U = 0x04,
+ V128Load32x2S = 0x05,
+ V128Load32x2U = 0x06,
+ V128Load8Splat = 0x07,
+ V128Load16Splat = 0x08,
+ V128Load32Splat = 0x09,
+ V128Load64Splat = 0x0a,
+ V128Store = 0x0b,
+ V128Const = 0x0c,
+ I8x16Shuffle = 0x0d,
+ I8x16Swizzle = 0x0e,
+ I8x16Splat = 0x0f,
+ I16x8Splat = 0x10,
+ I32x4Splat = 0x11,
+ I64x2Splat = 0x12,
+ F32x4Splat = 0x13,
+ F64x2Splat = 0x14,
+ I8x16ExtractLaneS = 0x15,
+ I8x16ExtractLaneU = 0x16,
+ I8x16ReplaceLane = 0x17,
+ I16x8ExtractLaneS = 0x18,
+ I16x8ExtractLaneU = 0x19,
+ I16x8ReplaceLane = 0x1a,
+ I32x4ExtractLane = 0x1b,
+ I32x4ReplaceLane = 0x1c,
+ I64x2ExtractLane = 0x1d,
+ I64x2ReplaceLane = 0x1e,
+ F32x4ExtractLane = 0x1f,
+ F32x4ReplaceLane = 0x20,
+ F64x2ExtractLane = 0x21,
+ F64x2ReplaceLane = 0x22,
+ I8x16Eq = 0x23,
+ I8x16Ne = 0x24,
+ I8x16LtS = 0x25,
+ I8x16LtU = 0x26,
+ I8x16GtS = 0x27,
+ I8x16GtU = 0x28,
+ I8x16LeS = 0x29,
+ I8x16LeU = 0x2a,
+ I8x16GeS = 0x2b,
+ I8x16GeU = 0x2c,
+ I16x8Eq = 0x2d,
+ I16x8Ne = 0x2e,
+ I16x8LtS = 0x2f,
+ I16x8LtU = 0x30,
+ I16x8GtS = 0x31,
+ I16x8GtU = 0x32,
+ I16x8LeS = 0x33,
+ I16x8LeU = 0x34,
+ I16x8GeS = 0x35,
+ I16x8GeU = 0x36,
+ I32x4Eq = 0x37,
+ I32x4Ne = 0x38,
+ I32x4LtS = 0x39,
+ I32x4LtU = 0x3a,
+ I32x4GtS = 0x3b,
+ I32x4GtU = 0x3c,
+ I32x4LeS = 0x3d,
+ I32x4LeU = 0x3e,
+ I32x4GeS = 0x3f,
+ I32x4GeU = 0x40,
+ F32x4Eq = 0x41,
+ F32x4Ne = 0x42,
+ F32x4Lt = 0x43,
+ F32x4Gt = 0x44,
+ F32x4Le = 0x45,
+ F32x4Ge = 0x46,
+ F64x2Eq = 0x47,
+ F64x2Ne = 0x48,
+ F64x2Lt = 0x49,
+ F64x2Gt = 0x4a,
+ F64x2Le = 0x4b,
+ F64x2Ge = 0x4c,
+ V128Not = 0x4d,
+ V128And = 0x4e,
+ V128AndNot = 0x4f,
+ V128Or = 0x50,
+ V128Xor = 0x51,
+ V128Bitselect = 0x52,
+ V128AnyTrue = 0x53,
+ V128Load8Lane = 0x54,
+ V128Load16Lane = 0x55,
+ V128Load32Lane = 0x56,
+ V128Load64Lane = 0x57,
+ V128Store8Lane = 0x58,
+ V128Store16Lane = 0x59,
+ V128Store32Lane = 0x5a,
+ V128Store64Lane = 0x5b,
+ V128Load32Zero = 0x5c,
+ V128Load64Zero = 0x5d,
+ F32x4DemoteF64x2Zero = 0x5e,
+ F64x2PromoteLowF32x4 = 0x5f,
+ I8x16Abs = 0x60,
+ I8x16Neg = 0x61,
+ I8x16Popcnt = 0x62,
+ I8x16AllTrue = 0x63,
+ I8x16Bitmask = 0x64,
+ I8x16NarrowI16x8S = 0x65,
+ I8x16NarrowI16x8U = 0x66,
+ F32x4Ceil = 0x67,
+ F32x4Floor = 0x68,
+ F32x4Trunc = 0x69,
+ F32x4Nearest = 0x6a,
+ I8x16Shl = 0x6b,
+ I8x16ShrS = 0x6c,
+ I8x16ShrU = 0x6d,
+ I8x16Add = 0x6e,
+ I8x16AddSatS = 0x6f,
+ I8x16AddSatU = 0x70,
+ I8x16Sub = 0x71,
+ I8x16SubSatS = 0x72,
+ I8x16SubSatU = 0x73,
+ F64x2Ceil = 0x74,
+ F64x2Floor = 0x75,
+ I8x16MinS = 0x76,
+ I8x16MinU = 0x77,
+ I8x16MaxS = 0x78,
+ I8x16MaxU = 0x79,
+ F64x2Trunc = 0x7a,
+ I8x16AvgrU = 0x7b,
+ I16x8ExtaddPairwiseI8x16S = 0x7c,
+ I16x8ExtaddPairwiseI8x16U = 0x7d,
+ I32x4ExtaddPairwiseI16x8S = 0x7e,
+ I32x4ExtaddPairwiseI16x8U = 0x7f,
+ I16x8Abs = 0x80,
+ I16x8Neg = 0x81,
+ I16x8Q15MulrSatS = 0x82,
+ I16x8AllTrue = 0x83,
+ I16x8Bitmask = 0x84,
+ I16x8NarrowI32x4S = 0x85,
+ I16x8NarrowI32x4U = 0x86,
+ I16x8ExtendLowI8x16S = 0x87,
+ I16x8ExtendHighI8x16S = 0x88,
+ I16x8ExtendLowI8x16U = 0x89,
+ I16x8ExtendHighI8x16U = 0x8a,
+ I16x8Shl = 0x8b,
+ I16x8ShrS = 0x8c,
+ I16x8ShrU = 0x8d,
+ I16x8Add = 0x8e,
+ I16x8AddSatS = 0x8f,
+ I16x8AddSatU = 0x90,
+ I16x8Sub = 0x91,
+ I16x8SubSatS = 0x92,
+ I16x8SubSatU = 0x93,
+ F64x2Nearest = 0x94,
+ I16x8Mul = 0x95,
+ I16x8MinS = 0x96,
+ I16x8MinU = 0x97,
+ I16x8MaxS = 0x98,
+ I16x8MaxU = 0x99,
+ // Unused = 0x9a
+ I16x8AvgrU = 0x9b,
+ I16x8ExtmulLowI8x16S = 0x9c,
+ I16x8ExtmulHighI8x16S = 0x9d,
+ I16x8ExtmulLowI8x16U = 0x9e,
+ I16x8ExtmulHighI8x16U = 0x9f,
+ I32x4Abs = 0xa0,
+ I32x4Neg = 0xa1,
+ // Unused = 0xa2
+ I32x4AllTrue = 0xa3,
+ I32x4Bitmask = 0xa4,
+ // Unused = 0xa5
+ // Unused = 0xa6
+ I32x4ExtendLowI16x8S = 0xa7,
+ I32x4ExtendHighI16x8S = 0xa8,
+ I32x4ExtendLowI16x8U = 0xa9,
+ I32x4ExtendHighI16x8U = 0xaa,
+ I32x4Shl = 0xab,
+ I32x4ShrS = 0xac,
+ I32x4ShrU = 0xad,
+ I32x4Add = 0xae,
+ // Unused = 0xaf
+ // Unused = 0xb0
+ I32x4Sub = 0xb1,
+ // Unused = 0xb2
+ // Unused = 0xb3
+ // Unused = 0xb4
+ I32x4Mul = 0xb5,
+ I32x4MinS = 0xb6,
+ I32x4MinU = 0xb7,
+ I32x4MaxS = 0xb8,
+ I32x4MaxU = 0xb9,
+ I32x4DotI16x8S = 0xba,
+ // Unused = 0xbb
+ I32x4ExtmulLowI16x8S = 0xbc,
+ I32x4ExtmulHighI16x8S = 0xbd,
+ I32x4ExtmulLowI16x8U = 0xbe,
+ I32x4ExtmulHighI16x8U = 0xbf,
+ I64x2Abs = 0xc0,
+ I64x2Neg = 0xc1,
+ // AnyTrue = 0xc2
+ I64x2AllTrue = 0xc3,
+ I64x2Bitmask = 0xc4,
+ // Unused = 0xc5
+ // Unused = 0xc6
+ I64x2ExtendLowI32x4S = 0xc7,
+ I64x2ExtendHighI32x4S = 0xc8,
+ I64x2ExtendLowI32x4U = 0xc9,
+ I64x2ExtendHighI32x4U = 0xca,
+ I64x2Shl = 0xcb,
+ I64x2ShrS = 0xcc,
+ I64x2ShrU = 0xcd,
+ I64x2Add = 0xce,
+ // Unused = 0xcf
+ // Unused = 0xd0
+ I64x2Sub = 0xd1,
+ // Unused = 0xd2
+ // Unused = 0xd3
+ // Unused = 0xd4
+ I64x2Mul = 0xd5,
+ I64x2Eq = 0xd6,
+ I64x2Ne = 0xd7,
+ I64x2LtS = 0xd8,
+ I64x2GtS = 0xd9,
+ I64x2LeS = 0xda,
+ I64x2GeS = 0xdb,
+ I64x2ExtmulLowI32x4S = 0xdc,
+ I64x2ExtmulHighI32x4S = 0xdd,
+ I64x2ExtmulLowI32x4U = 0xde,
+ I64x2ExtmulHighI32x4U = 0xdf,
+ F32x4Abs = 0xe0,
+ F32x4Neg = 0xe1,
+ // Unused = 0xe2
+ F32x4Sqrt = 0xe3,
+ F32x4Add = 0xe4,
+ F32x4Sub = 0xe5,
+ F32x4Mul = 0xe6,
+ F32x4Div = 0xe7,
+ F32x4Min = 0xe8,
+ F32x4Max = 0xe9,
+ F32x4PMin = 0xea,
+ F32x4PMax = 0xeb,
+ F64x2Abs = 0xec,
+ F64x2Neg = 0xed,
+ // Unused = 0xee
+ F64x2Sqrt = 0xef,
+ F64x2Add = 0xf0,
+ F64x2Sub = 0xf1,
+ F64x2Mul = 0xf2,
+ F64x2Div = 0xf3,
+ F64x2Min = 0xf4,
+ F64x2Max = 0xf5,
+ F64x2PMin = 0xf6,
+ F64x2PMax = 0xf7,
+ I32x4TruncSatF32x4S = 0xf8,
+ I32x4TruncSatF32x4U = 0xf9,
+ F32x4ConvertI32x4S = 0xfa,
+ F32x4ConvertI32x4U = 0xfb,
+ I32x4TruncSatF64x2SZero = 0xfc,
+ I32x4TruncSatF64x2UZero = 0xfd,
+ F64x2ConvertLowI32x4S = 0xfe,
+ F64x2ConvertLowI32x4U = 0xff,
+ I8x16RelaxedSwizzle = 0x100,
+ I32x4RelaxedTruncF32x4S = 0x101,
+ I32x4RelaxedTruncF32x4U = 0x102,
+ I32x4RelaxedTruncF64x2SZero = 0x103,
+ I32x4RelaxedTruncF64x2UZero = 0x104,
+ F32x4RelaxedFma = 0x105,
+ F32x4RelaxedFnma = 0x106,
+ F64x2RelaxedFma = 0x107,
+ F64x2RelaxedFnma = 0x108,
+ I8x16RelaxedLaneSelect = 0x109,
+ I16x8RelaxedLaneSelect = 0x10a,
+ I32x4RelaxedLaneSelect = 0x10b,
+ I64x2RelaxedLaneSelect = 0x10c,
+ F32x4RelaxedMin = 0x10d,
+ F32x4RelaxedMax = 0x10e,
+ F64x2RelaxedMin = 0x10f,
+ F64x2RelaxedMax = 0x110,
+ I16x8RelaxedQ15MulrS = 0x111,
+ I16x8DotI8x16I7x16S = 0x112,
+ I32x4DotI8x16I7x16AddS = 0x113,
+
+ // Reserved for Relaxed SIMD = 0x114-0x12f
+
+ // Unused = 0x130 and up
+
+ // Mozilla extensions
+ MozPMADDUBSW = 0x201,
+
+ Limit
+};
+
+// Opcodes in the "miscellaneous" opcode space.
+enum class MiscOp {
+ // Saturating float-to-int conversions
+ I32TruncSatF32S = 0x00,
+ I32TruncSatF32U = 0x01,
+ I32TruncSatF64S = 0x02,
+ I32TruncSatF64U = 0x03,
+ I64TruncSatF32S = 0x04,
+ I64TruncSatF32U = 0x05,
+ I64TruncSatF64S = 0x06,
+ I64TruncSatF64U = 0x07,
+
+ // Bulk memory operations, per proposal as of February 2019.
+ MemoryInit = 0x08,
+ DataDrop = 0x09,
+ MemoryCopy = 0x0a,
+ MemoryFill = 0x0b,
+ TableInit = 0x0c,
+ ElemDrop = 0x0d,
+ TableCopy = 0x0e,
+
+ // Reftypes, per proposal as of February 2019.
+ TableGrow = 0x0f,
+ TableSize = 0x10,
+ TableFill = 0x11,
+
+ MemoryDiscard = 0x12,
+
+ Limit
+};
+
+// Opcodes from threads proposal as of June 30, 2017
+enum class ThreadOp {
+ // Wait and wake
+ Wake = 0x00,
+ I32Wait = 0x01,
+ I64Wait = 0x02,
+ Fence = 0x03,
+
+ // Load and store
+ I32AtomicLoad = 0x10,
+ I64AtomicLoad = 0x11,
+ I32AtomicLoad8U = 0x12,
+ I32AtomicLoad16U = 0x13,
+ I64AtomicLoad8U = 0x14,
+ I64AtomicLoad16U = 0x15,
+ I64AtomicLoad32U = 0x16,
+ I32AtomicStore = 0x17,
+ I64AtomicStore = 0x18,
+ I32AtomicStore8U = 0x19,
+ I32AtomicStore16U = 0x1a,
+ I64AtomicStore8U = 0x1b,
+ I64AtomicStore16U = 0x1c,
+ I64AtomicStore32U = 0x1d,
+
+ // Read-modify-write operations
+ I32AtomicAdd = 0x1e,
+ I64AtomicAdd = 0x1f,
+ I32AtomicAdd8U = 0x20,
+ I32AtomicAdd16U = 0x21,
+ I64AtomicAdd8U = 0x22,
+ I64AtomicAdd16U = 0x23,
+ I64AtomicAdd32U = 0x24,
+
+ I32AtomicSub = 0x25,
+ I64AtomicSub = 0x26,
+ I32AtomicSub8U = 0x27,
+ I32AtomicSub16U = 0x28,
+ I64AtomicSub8U = 0x29,
+ I64AtomicSub16U = 0x2a,
+ I64AtomicSub32U = 0x2b,
+
+ I32AtomicAnd = 0x2c,
+ I64AtomicAnd = 0x2d,
+ I32AtomicAnd8U = 0x2e,
+ I32AtomicAnd16U = 0x2f,
+ I64AtomicAnd8U = 0x30,
+ I64AtomicAnd16U = 0x31,
+ I64AtomicAnd32U = 0x32,
+
+ I32AtomicOr = 0x33,
+ I64AtomicOr = 0x34,
+ I32AtomicOr8U = 0x35,
+ I32AtomicOr16U = 0x36,
+ I64AtomicOr8U = 0x37,
+ I64AtomicOr16U = 0x38,
+ I64AtomicOr32U = 0x39,
+
+ I32AtomicXor = 0x3a,
+ I64AtomicXor = 0x3b,
+ I32AtomicXor8U = 0x3c,
+ I32AtomicXor16U = 0x3d,
+ I64AtomicXor8U = 0x3e,
+ I64AtomicXor16U = 0x3f,
+ I64AtomicXor32U = 0x40,
+
+ I32AtomicXchg = 0x41,
+ I64AtomicXchg = 0x42,
+ I32AtomicXchg8U = 0x43,
+ I32AtomicXchg16U = 0x44,
+ I64AtomicXchg8U = 0x45,
+ I64AtomicXchg16U = 0x46,
+ I64AtomicXchg32U = 0x47,
+
+ // CompareExchange
+ I32AtomicCmpXchg = 0x48,
+ I64AtomicCmpXchg = 0x49,
+ I32AtomicCmpXchg8U = 0x4a,
+ I32AtomicCmpXchg16U = 0x4b,
+ I64AtomicCmpXchg8U = 0x4c,
+ I64AtomicCmpXchg16U = 0x4d,
+ I64AtomicCmpXchg32U = 0x4e,
+
+ Limit
+};
+
+enum class IntrinsicId {
+// ------------------------------------------------------------------------
+// These are part/suffix of the MozOp::Intrinsic operators that are emitted
+// internally when compiling intrinsic modules and are rejected by wasm
+// validation.
+// See wasm/WasmIntrinsic.yaml for the list.
+#define DECL_INTRINSIC_OP(op, export, sa_name, abitype, entry, idx) \
+ op = idx, // NOLINT
+ FOR_EACH_INTRINSIC(DECL_INTRINSIC_OP)
+#undef DECL_INTRINSIC_OP
+
+ // Op limit.
+ Limit
+};
+
+enum class MozOp {
+ // ------------------------------------------------------------------------
+ // These operators are emitted internally when compiling asm.js and are
+ // rejected by wasm validation. They are prefixed by MozPrefix.
+
+ // asm.js-specific operators. They start at 1 so as to check for
+ // uninitialized (zeroed) storage.
+ TeeGlobal = 0x01,
+ I32Min,
+ I32Max,
+ I32Neg,
+ I32BitNot,
+ I32Abs,
+ F32TeeStoreF64,
+ F64TeeStoreF32,
+ I32TeeStore8,
+ I32TeeStore16,
+ I64TeeStore8,
+ I64TeeStore16,
+ I64TeeStore32,
+ I32TeeStore,
+ I64TeeStore,
+ F32TeeStore,
+ F64TeeStore,
+ F64Mod,
+ F64SinNative,
+ F64SinFdlibm,
+ F64CosNative,
+ F64CosFdlibm,
+ F64TanNative,
+ F64TanFdlibm,
+ F64Asin,
+ F64Acos,
+ F64Atan,
+ F64Exp,
+ F64Log,
+ F64Pow,
+ F64Atan2,
+
+ // asm.js-style call_indirect with the callee evaluated first.
+ OldCallDirect,
+ OldCallIndirect,
+
+ // Intrinsic modules operations. The operator has argument leb u32 to specify
+ // particular operation id. See IntrinsicId above.
+ Intrinsic,
+
+ Limit
+};
+
+struct OpBytes {
+ // b0 is a byte value but has a 16-bit representation to allow for a full
+ // 256-value range plus a sentinel Limit value.
+ uint16_t b0;
+ // b1 is a LEB128 value but 32 bits is enough for now.
+ uint32_t b1;
+
+ explicit OpBytes(Op x) {
+ b0 = uint16_t(x);
+ b1 = 0;
+ }
+ OpBytes() = default;
+
+ // Whether this opcode should have a breakpoint site inserted directly before
+ // the opcode in baseline when debugging. We use this as a heuristic to
+ // reduce the number of breakpoint sites.
+ bool shouldHaveBreakpoint() const {
+ switch (Op(b0)) {
+ // Block-like instructions don't get their own breakpoint site, a
+ // breakpoint can be used on instructions in the block.
+ case Op::Block:
+ case Op::Loop:
+ case Op::If:
+ case Op::Else:
+ case Op::Try:
+ case Op::Delegate:
+ case Op::Catch:
+ case Op::CatchAll:
+ case Op::End:
+ // Effect-less instructions without inputs are leaf nodes in expressions,
+ // a breakpoint can be used on instructions that consume these values.
+ case Op::LocalGet:
+ case Op::GlobalGet:
+ case Op::I32Const:
+ case Op::I64Const:
+ case Op::F32Const:
+ case Op::F64Const:
+ case Op::RefNull:
+ case Op::Drop:
+ return false;
+ default:
+ return true;
+ }
+ }
+};
+
+static const char NameSectionName[] = "name";
+static const char SourceMappingURLSectionName[] = "sourceMappingURL";
+
+enum class NameType { Module = 0, Function = 1, Local = 2 };
+
+enum class FieldFlags { Mutable = 0x01, AllowedMask = 0x01 };
+
+enum class FieldWideningOp { None, Signed, Unsigned };
+
+// The WebAssembly spec hard-codes the virtual page size to be 64KiB and
+// requires the size of linear memory to always be a multiple of 64KiB.
+
+static const unsigned PageSize = 64 * 1024;
+static const unsigned PageBits = 16;
+static_assert(PageSize == (1u << PageBits));
+
+static const unsigned PageMask = ((1u << PageBits) - 1);
+
+// These limits are agreed upon with other engines for consistency.
+
+static const unsigned MaxTypes = 1000000;
+static const unsigned MaxFuncs = 1000000;
+static const unsigned MaxTables = 100000;
+static const unsigned MaxImports = 100000;
+static const unsigned MaxExports = 100000;
+static const unsigned MaxGlobals = 1000000;
+static const unsigned MaxDataSegments = 100000;
+static const unsigned MaxDataSegmentLengthPages = 16384;
+static const unsigned MaxElemSegments = 10000000;
+static const unsigned MaxElemSegmentLength = 10000000;
+static const unsigned MaxTableLimitField = UINT32_MAX;
+static const unsigned MaxTableLength = 10000000;
+static const unsigned MaxLocals = 50000;
+static const unsigned MaxParams = 1000;
+static const unsigned MaxResults = 1000;
+static const unsigned MaxStructFields = 2000;
+static const uint64_t MaxMemory32LimitField = uint64_t(1) << 16;
+static const uint64_t MaxMemory64LimitField = uint64_t(1) << 48;
+static const unsigned MaxStringBytes = 100000;
+static const unsigned MaxModuleBytes = 1024 * 1024 * 1024;
+static const unsigned MaxFunctionBytes = 7654321;
+
+// These limits pertain to our WebAssembly implementation only, but may make
+// sense to get into the shared limits spec eventually.
+
+static const unsigned MaxRecGroups = 1000000;
+static const unsigned MaxSubTypingDepth = 31;
+static const unsigned MaxTags = 1000000;
+
+// Maximum payload size, in bytes, of a gc-proposal Array. Puts it fairly
+// close to 2^31 without exposing us to potential danger at the signed-i32
+// wraparound boundary. Note that gc-proposal Struct sizes are limited by
+// MaxStructFields above. Some code assumes that the payload size will fit in
+// a uint32_t, hence the static assert.
+static const unsigned MaxArrayPayloadBytes = 1987654321;
+static_assert(uint64_t(MaxArrayPayloadBytes) <
+ (uint64_t(1) << (8 * sizeof(uint32_t))));
+
+// These limits pertain to our WebAssembly implementation only.
+
+static const unsigned MaxBrTableElems = 1000000;
+static const unsigned MaxCodeSectionBytes = MaxModuleBytes;
+
+// 512KiB should be enough, considering how Rabaldr uses the stack and
+// what the standard limits are:
+//
+// - 1,000 parameters
+// - 50,000 locals
+// - 10,000 values on the eval stack (not an official limit)
+//
+// At sizeof(int64) bytes per slot this works out to about 480KiB.
+
+static const unsigned MaxFrameSize = 512 * 1024;
+
+// Asserted by Decoder::readVarU32.
+
+static const unsigned MaxVarU32DecodedBytes = 5;
+
+// The CompileMode controls how compilation of a module is performed (notably,
+// how many times we compile it).
+
+enum class CompileMode { Once, Tier1, Tier2 };
+
+// Typed enum for whether debugging is enabled.
+
+enum class DebugEnabled { False, True };
+
+} // namespace wasm
+} // namespace js
+
+#endif // wasm_constants_h
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