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-rw-r--r--testing/web-platform/tests/wasm/jsapi/wasm-module-builder.js1531
1 files changed, 1531 insertions, 0 deletions
diff --git a/testing/web-platform/tests/wasm/jsapi/wasm-module-builder.js b/testing/web-platform/tests/wasm/jsapi/wasm-module-builder.js
new file mode 100644
index 0000000000..1d8db0a6e6
--- /dev/null
+++ b/testing/web-platform/tests/wasm/jsapi/wasm-module-builder.js
@@ -0,0 +1,1531 @@
+// Copyright 2016 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.
+
+// Used for encoding f32 and double constants to bits.
+let byte_view = new Uint8Array(8);
+let data_view = new DataView(byte_view.buffer);
+
+// The bytes function receives one of
+// - several arguments, each of which is either a number or a string of length
+// 1; if it's a string, the charcode of the contained character is used.
+// - a single array argument containing the actual arguments
+// - a single string; the returned buffer will contain the char codes of all
+// contained characters.
+function bytes(...input) {
+ if (input.length == 1 && typeof input[0] == 'array') input = input[0];
+ if (input.length == 1 && typeof input[0] == 'string') {
+ let len = input[0].length;
+ let view = new Uint8Array(len);
+ for (let i = 0; i < len; i++) view[i] = input[0].charCodeAt(i);
+ return view.buffer;
+ }
+ let view = new Uint8Array(input.length);
+ for (let i = 0; i < input.length; i++) {
+ let val = input[i];
+ if (typeof val == 'string') {
+ assertEquals(1, val.length, 'string inputs must have length 1');
+ val = val.charCodeAt(0);
+ }
+ view[i] = val | 0;
+ }
+ return view.buffer;
+}
+
+// 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;
+var kMaxVarInt32Size = 5;
+var kMaxVarInt64Size = 10;
+
+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 kDataCountSectionCode = 12; // Data segment count (between Element & Code)
+let kTagSectionCode = 13; // Tag section (between Memory & Global)
+
+// Name section types
+let kModuleNameCode = 0;
+let kFunctionNamesCode = 1;
+let kLocalNamesCode = 2;
+
+let kWasmFunctionTypeForm = 0x60;
+let kWasmAnyFunctionTypeForm = 0x70;
+let kWasmStructTypeForm = 0x5f;
+let kWasmArrayTypeForm = 0x5e;
+let kWasmSubtypeForm = 0x50;
+let kWasmSubtypeFinalForm = 0x4f;
+let kWasmRecursiveTypeGroupForm = 0x4e;
+
+let kNoSuperType = 0xFFFFFFFF;
+
+let kHasMaximumFlag = 1;
+let kSharedHasMaximumFlag = 3;
+
+// Segment flags
+let kActiveNoIndex = 0;
+let kPassive = 1;
+let kActiveWithIndex = 2;
+let kPassiveWithElements = 5;
+
+// 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;
+
+// These are defined as negative integers to distinguish them from positive type
+// indices.
+let kWasmNullFuncRef = -0x0d;
+let kWasmNullExternRef = -0x0e;
+let kWasmNullRef = -0x0f;
+let kWasmFuncRef = -0x10;
+let kWasmAnyFunc = kWasmFuncRef; // Alias named as in the JS API spec
+let kWasmExternRef = -0x11;
+let kWasmAnyRef = -0x12;
+let kWasmEqRef = -0x13;
+let kWasmI31Ref = -0x14;
+let kWasmStructRef = -0x15;
+let kWasmArrayRef = -0x16;
+
+// Use the positive-byte versions inside function bodies.
+let kLeb128Mask = 0x7f;
+let kFuncRefCode = kWasmFuncRef & kLeb128Mask;
+let kAnyFuncCode = kFuncRefCode; // Alias named as in the JS API spec
+let kExternRefCode = kWasmExternRef & kLeb128Mask;
+let kAnyRefCode = kWasmAnyRef & kLeb128Mask;
+let kEqRefCode = kWasmEqRef & kLeb128Mask;
+let kI31RefCode = kWasmI31Ref & kLeb128Mask;
+let kNullExternRefCode = kWasmNullExternRef & kLeb128Mask;
+let kNullFuncRefCode = kWasmNullFuncRef & kLeb128Mask;
+let kStructRefCode = kWasmStructRef & kLeb128Mask;
+let kArrayRefCode = kWasmArrayRef & kLeb128Mask;
+let kNullRefCode = kWasmNullRef & kLeb128Mask;
+
+let kWasmRefNull = 0x63;
+let kWasmRef = 0x64;
+function wasmRefNullType(heap_type) {
+ return {opcode: kWasmRefNull, heap_type: heap_type};
+}
+function wasmRefType(heap_type) {
+ return {opcode: kWasmRef, heap_type: heap_type};
+}
+
+let kExternalFunction = 0;
+let kExternalTable = 1;
+let kExternalMemory = 2;
+let kExternalGlobal = 3;
+let kExternalTag = 4;
+
+let kTableZero = 0;
+let kMemoryZero = 0;
+let kSegmentZero = 0;
+
+let kTagAttribute = 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_v_iiii = makeSig([kWasmI32, kWasmI32, kWasmI32, kWasmI32], []);
+let kSig_f_ff = makeSig([kWasmF32, kWasmF32], [kWasmF32]);
+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([], [kWasmF32]);
+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_f_d = makeSig([kWasmF64], [kWasmF32]);
+let kSig_d_d = makeSig([kWasmF64], [kWasmF64]);
+let kSig_r_r = makeSig([kWasmExternRef], [kWasmExternRef]);
+let kSig_a_a = makeSig([kWasmAnyFunc], [kWasmAnyFunc]);
+let kSig_i_r = makeSig([kWasmExternRef], [kWasmI32]);
+let kSig_v_r = makeSig([kWasmExternRef], []);
+let kSig_v_a = makeSig([kWasmAnyFunc], []);
+let kSig_v_rr = makeSig([kWasmExternRef, kWasmExternRef], []);
+let kSig_v_aa = makeSig([kWasmAnyFunc, kWasmAnyFunc], []);
+let kSig_r_v = makeSig([], [kWasmExternRef]);
+let kSig_a_v = makeSig([], [kWasmAnyFunc]);
+let kSig_a_i = makeSig([kWasmI32], [kWasmAnyFunc]);
+
+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 kExprCatchAll = 0x19;
+let kExprThrow = 0x08;
+let kExprRethrow = 0x09;
+let kExprBrOnExn = 0x0a;
+let kExprEnd = 0x0b;
+let kExprBr = 0x0c;
+let kExprBrIf = 0x0d;
+let kExprBrTable = 0x0e;
+let kExprReturn = 0x0f;
+let kExprCallFunction = 0x10;
+let kExprCallIndirect = 0x11;
+let kExprReturnCall = 0x12;
+let kExprReturnCallIndirect = 0x13;
+let kExprDrop = 0x1a;
+let kExprSelect = 0x1b;
+let kExprLocalGet = 0x20;
+let kExprLocalSet = 0x21;
+let kExprLocalTee = 0x22;
+let kExprGlobalGet = 0x23;
+let kExprGlobalSet = 0x24;
+let kExprTableGet = 0x25;
+let kExprTableSet = 0x26;
+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 kExprMemoryGrow = 0x40;
+let kExprI32Const = 0x41;
+let kExprI64Const = 0x42;
+let kExprF32Const = 0x43;
+let kExprF64Const = 0x44;
+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;
+let kExprI32SExtendI8 = 0xc0;
+let kExprI32SExtendI16 = 0xc1;
+let kExprI64SExtendI8 = 0xc2;
+let kExprI64SExtendI16 = 0xc3;
+let kExprI64SExtendI32 = 0xc4;
+let kExprRefNull = 0xd0;
+let kExprRefIsNull = 0xd1;
+let kExprRefFunc = 0xd2;
+
+// Prefix opcodes
+let kGCPrefix = 0xfb;
+let kNumericPrefix = 0xfc;
+let kSimdPrefix = 0xfd;
+let kAtomicPrefix = 0xfe;
+
+// Use these for multi-byte instructions (opcode > 0x7F needing two LEB bytes):
+function GCInstr(opcode) {
+ if (opcode <= 0x7F) return [kGCPrefix, opcode];
+ return [kGCPrefix, 0x80 | (opcode & 0x7F), opcode >> 7];
+}
+
+// GC opcodes
+let kExprStructNew = 0x00;
+let kExprStructNewDefault = 0x01;
+let kExprStructGet = 0x02;
+let kExprStructGetS = 0x03;
+let kExprStructGetU = 0x04;
+let kExprStructSet = 0x05;
+let kExprArrayNew = 0x06;
+let kExprArrayNewDefault = 0x07;
+let kExprArrayNewFixed = 0x08;
+let kExprArrayNewData = 0x09;
+let kExprArrayNewElem = 0x0a;
+let kExprArrayGet = 0x0b;
+let kExprArrayGetS = 0x0c;
+let kExprArrayGetU = 0x0d;
+let kExprArraySet = 0x0e;
+let kExprArrayLen = 0x0f;
+let kExprArrayFill = 0x10;
+let kExprArrayCopy = 0x11;
+let kExprArrayInitData = 0x12;
+let kExprArrayInitElem = 0x13;
+let kExprRefTest = 0x14;
+let kExprRefTestNull = 0x15;
+let kExprRefCast = 0x16;
+let kExprRefCastNull = 0x17;
+let kExprBrOnCast = 0x18;
+let kExprBrOnCastFail = 0x19;
+let kExprExternInternalize = 0x1a;
+let kExprExternExternalize = 0x1b;
+let kExprI31New = 0x1c;
+let kExprI31GetS = 0x1d;
+let kExprI31GetU = 0x1e;
+
+// Numeric opcodes.
+let kExprMemoryInit = 0x08;
+let kExprDataDrop = 0x09;
+let kExprMemoryCopy = 0x0a;
+let kExprMemoryFill = 0x0b;
+let kExprTableInit = 0x0c;
+let kExprElemDrop = 0x0d;
+let kExprTableCopy = 0x0e;
+let kExprTableGrow = 0x0f;
+let kExprTableSize = 0x10;
+let kExprTableFill = 0x11;
+
+// Atomic opcodes.
+let kExprAtomicNotify = 0x00;
+let kExprI32AtomicWait = 0x01;
+let kExprI64AtomicWait = 0x02;
+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 kExprI64AtomicLoad = 0x11;
+let kExprI64AtomicLoad8U = 0x14;
+let kExprI64AtomicLoad16U = 0x15;
+let kExprI64AtomicLoad32U = 0x16;
+let kExprI64AtomicStore = 0x18;
+let kExprI64AtomicStore8U = 0x1b;
+let kExprI64AtomicStore16U = 0x1c;
+let kExprI64AtomicStore32U = 0x1d;
+let kExprI64AtomicAdd = 0x1f;
+let kExprI64AtomicAdd8U = 0x22;
+let kExprI64AtomicAdd16U = 0x23;
+let kExprI64AtomicAdd32U = 0x24;
+let kExprI64AtomicSub = 0x26;
+let kExprI64AtomicSub8U = 0x29;
+let kExprI64AtomicSub16U = 0x2a;
+let kExprI64AtomicSub32U = 0x2b;
+let kExprI64AtomicAnd = 0x2d;
+let kExprI64AtomicAnd8U = 0x30;
+let kExprI64AtomicAnd16U = 0x31;
+let kExprI64AtomicAnd32U = 0x32;
+let kExprI64AtomicOr = 0x34;
+let kExprI64AtomicOr8U = 0x37;
+let kExprI64AtomicOr16U = 0x38;
+let kExprI64AtomicOr32U = 0x39;
+let kExprI64AtomicXor = 0x3b;
+let kExprI64AtomicXor8U = 0x3e;
+let kExprI64AtomicXor16U = 0x3f;
+let kExprI64AtomicXor32U = 0x40;
+let kExprI64AtomicExchange = 0x42;
+let kExprI64AtomicExchange8U = 0x45;
+let kExprI64AtomicExchange16U = 0x46;
+let kExprI64AtomicExchange32U = 0x47;
+let kExprI64AtomicCompareExchange = 0x49
+let kExprI64AtomicCompareExchange8U = 0x4c;
+let kExprI64AtomicCompareExchange16U = 0x4d;
+let kExprI64AtomicCompareExchange32U = 0x4e;
+
+// Simd opcodes.
+let kExprS128LoadMem = 0x00;
+let kExprS128StoreMem = 0x01;
+let kExprI32x4Splat = 0x0c;
+let kExprI32x4Eq = 0x2c;
+let kExprS1x4AllTrue = 0x75;
+let kExprF32x4Min = 0x9e;
+
+class Binary {
+ constructor() {
+ this.length = 0;
+ this.buffer = new Uint8Array(8192);
+ }
+
+ ensure_space(needed) {
+ if (this.buffer.length - this.length >= needed) return;
+ let new_capacity = this.buffer.length * 2;
+ while (new_capacity - this.length < needed) new_capacity *= 2;
+ let new_buffer = new Uint8Array(new_capacity);
+ new_buffer.set(this.buffer);
+ this.buffer = new_buffer;
+ }
+
+ trunc_buffer() {
+ return new Uint8Array(this.buffer.buffer, 0, this.length);
+ }
+
+ reset() {
+ this.length = 0;
+ }
+
+ emit_u8(val) {
+ this.ensure_space(1);
+ this.buffer[this.length++] = val;
+ }
+
+ emit_u16(val) {
+ this.ensure_space(2);
+ this.buffer[this.length++] = val;
+ this.buffer[this.length++] = val >> 8;
+ }
+
+ emit_u32(val) {
+ this.ensure_space(4);
+ this.buffer[this.length++] = val;
+ this.buffer[this.length++] = val >> 8;
+ this.buffer[this.length++] = val >> 16;
+ this.buffer[this.length++] = val >> 24;
+ }
+
+ emit_leb_u(val, max_len) {
+ this.ensure_space(max_len);
+ for (let i = 0; i < max_len; ++i) {
+ let v = val & 0xff;
+ val = val >>> 7;
+ if (val == 0) {
+ this.buffer[this.length++] = v;
+ return;
+ }
+ this.buffer[this.length++] = v | 0x80;
+ }
+ throw new Error("Leb value exceeds maximum length of " + max_len);
+ }
+
+ emit_u32v(val) {
+ this.emit_leb_u(val, kMaxVarInt32Size);
+ }
+
+ emit_u64v(val) {
+ this.emit_leb_u(val, kMaxVarInt64Size);
+ }
+
+ emit_bytes(data) {
+ this.ensure_space(data.length);
+ this.buffer.set(data, this.length);
+ this.length += data.length;
+ }
+
+ emit_string(string) {
+ // When testing illegal names, we pass a byte array directly.
+ if (string instanceof Array) {
+ this.emit_u32v(string.length);
+ this.emit_bytes(string);
+ return;
+ }
+
+ // This is the hacky way to convert a JavaScript string to a UTF8 encoded
+ // string only containing single-byte characters.
+ let string_utf8 = unescape(encodeURIComponent(string));
+ this.emit_u32v(string_utf8.length);
+ for (let i = 0; i < string_utf8.length; i++) {
+ this.emit_u8(string_utf8.charCodeAt(i));
+ }
+ }
+
+ emit_heap_type(heap_type) {
+ this.emit_bytes(wasmSignedLeb(heap_type, kMaxVarInt32Size));
+ }
+
+ emit_type(type) {
+ if ((typeof type) == 'number') {
+ this.emit_u8(type >= 0 ? type : type & kLeb128Mask);
+ } else {
+ this.emit_u8(type.opcode);
+ if ('depth' in type) this.emit_u8(type.depth);
+ this.emit_heap_type(type.heap_type);
+ }
+ }
+
+ emit_init_expr(expr) {
+ this.emit_bytes(expr);
+ this.emit_u8(kExprEnd);
+ }
+
+ emit_header() {
+ this.emit_bytes([
+ kWasmH0, kWasmH1, kWasmH2, kWasmH3, kWasmV0, kWasmV1, kWasmV2, kWasmV3
+ ]);
+ }
+
+ emit_section(section_code, content_generator) {
+ // Emit section name.
+ this.emit_u8(section_code);
+ // Emit the section to a temporary buffer: its full length isn't know yet.
+ const section = new Binary;
+ content_generator(section);
+ // Emit section length.
+ this.emit_u32v(section.length);
+ // Copy the temporary buffer.
+ // Avoid spread because {section} can be huge.
+ this.emit_bytes(section.trunc_buffer());
+ }
+}
+
+class WasmFunctionBuilder {
+ constructor(module, name, type_index) {
+ this.module = module;
+ this.name = name;
+ this.type_index = type_index;
+ this.body = [];
+ this.locals = [];
+ this.local_names = [];
+ }
+
+ numLocalNames() {
+ let num_local_names = 0;
+ for (let loc_name of this.local_names) {
+ if (loc_name !== undefined) ++num_local_names;
+ }
+ return num_local_names;
+ }
+
+ exportAs(name) {
+ this.module.addExport(name, this.index);
+ return this;
+ }
+
+ exportFunc() {
+ this.exportAs(this.name);
+ return this;
+ }
+
+ addBody(body) {
+ for (let b of body) {
+ if (typeof b !== 'number' || (b & (~0xFF)) !== 0 )
+ throw new Error('invalid body (entries must be 8 bit numbers): ' + body);
+ }
+ this.body = body.slice();
+ // Automatically add the end for the function block to the body.
+ this.body.push(kExprEnd);
+ return this;
+ }
+
+ addBodyWithEnd(body) {
+ this.body = body;
+ return this;
+ }
+
+ getNumLocals() {
+ let total_locals = 0;
+ for (let l of this.locals) {
+ for (let type of ["i32", "i64", "f32", "f64", "s128"]) {
+ total_locals += l[type + "_count"] || 0;
+ }
+ }
+ return total_locals;
+ }
+
+ addLocals(locals, names) {
+ const old_num_locals = this.getNumLocals();
+ this.locals.push(locals);
+ if (names) {
+ const missing_names = old_num_locals - this.local_names.length;
+ this.local_names.push(...new Array(missing_names), ...names);
+ }
+ return this;
+ }
+
+ end() {
+ return this.module;
+ }
+}
+
+class WasmGlobalBuilder {
+ constructor(module, type, mutable, init) {
+ this.module = module;
+ this.type = type;
+ this.mutable = mutable;
+ this.init = init;
+ }
+
+ exportAs(name) {
+ this.module.exports.push({name: name, kind: kExternalGlobal,
+ index: this.index});
+ return this;
+ }
+}
+
+function checkExpr(expr) {
+ for (let b of expr) {
+ if (typeof b !== 'number' || (b & (~0xFF)) !== 0) {
+ throw new Error(
+ 'invalid body (entries must be 8 bit numbers): ' + expr);
+ }
+ }
+}
+
+class WasmTableBuilder {
+ constructor(module, type, initial_size, max_size, init_expr) {
+ this.module = module;
+ this.type = type;
+ this.initial_size = initial_size;
+ this.has_max = max_size != undefined;
+ this.max_size = max_size;
+ this.init_expr = init_expr;
+ this.has_init = init_expr !== undefined;
+ }
+
+ exportAs(name) {
+ this.module.exports.push({name: name, kind: kExternalTable,
+ index: this.index});
+ return this;
+ }
+}
+
+function makeField(type, mutability) {
+ if ((typeof mutability) != 'boolean') {
+ throw new Error('field mutability must be boolean');
+ }
+ return {type: type, mutability: mutability};
+}
+
+class WasmStruct {
+ constructor(fields, is_final, supertype_idx) {
+ if (!Array.isArray(fields)) {
+ throw new Error('struct fields must be an array');
+ }
+ this.fields = fields;
+ this.type_form = kWasmStructTypeForm;
+ this.is_final = is_final;
+ this.supertype = supertype_idx;
+ }
+}
+
+class WasmArray {
+ constructor(type, mutability, is_final, supertype_idx) {
+ this.type = type;
+ this.mutability = mutability;
+ this.type_form = kWasmArrayTypeForm;
+ this.is_final = is_final;
+ this.supertype = supertype_idx;
+ }
+}
+
+class WasmModuleBuilder {
+ constructor() {
+ this.types = [];
+ this.imports = [];
+ this.exports = [];
+ this.globals = [];
+ this.tables = [];
+ this.tags = [];
+ this.functions = [];
+ this.element_segments = [];
+ this.data_segments = [];
+ this.explicit = [];
+ this.rec_groups = [];
+ this.num_imported_funcs = 0;
+ this.num_imported_globals = 0;
+ this.num_imported_tables = 0;
+ this.num_imported_tags = 0;
+ return this;
+ }
+
+ addStart(start_index) {
+ this.start_index = start_index;
+ return this;
+ }
+
+ addMemory(min, max, exp, shared) {
+ this.memory = {min: min, max: max, exp: exp, shared: shared};
+ return this;
+ }
+
+ addExplicitSection(bytes) {
+ this.explicit.push(bytes);
+ return this;
+ }
+
+ stringToBytes(name) {
+ var result = new Binary();
+ result.emit_string(name);
+ return result.trunc_buffer()
+ }
+
+ createCustomSection(name, bytes) {
+ name = this.stringToBytes(name);
+ var section = new Binary();
+ section.emit_u8(kUnknownSectionCode);
+ section.emit_u32v(name.length + bytes.length);
+ section.emit_bytes(name);
+ section.emit_bytes(bytes);
+ return section.trunc_buffer();
+ }
+
+ addCustomSection(name, bytes) {
+ this.explicit.push(this.createCustomSection(name, bytes));
+ }
+
+ // We use {is_final = true} so that the MVP syntax is generated for
+ // signatures.
+ addType(type, supertype_idx = kNoSuperType, is_final = true) {
+ var pl = type.params.length; // should have params
+ var rl = type.results.length; // should have results
+ var type_copy = {params: type.params, results: type.results,
+ is_final: is_final, supertype: supertype_idx};
+ this.types.push(type_copy);
+ return this.types.length - 1;
+ }
+
+ addStruct(fields, supertype_idx = kNoSuperType, is_final = false) {
+ this.types.push(new WasmStruct(fields, is_final, supertype_idx));
+ return this.types.length - 1;
+ }
+
+ addArray(type, mutability, supertype_idx = kNoSuperType, is_final = false) {
+ this.types.push(new WasmArray(type, mutability, is_final, supertype_idx));
+ return this.types.length - 1;
+ }
+
+ static defaultFor(type) {
+ switch (type) {
+ case kWasmI32:
+ return wasmI32Const(0);
+ case kWasmI64:
+ return wasmI64Const(0);
+ case kWasmF32:
+ return wasmF32Const(0.0);
+ case kWasmF64:
+ return wasmF64Const(0.0);
+ case kWasmS128:
+ return [kSimdPrefix, kExprS128Const, ...(new Array(16).fill(0))];
+ default:
+ if ((typeof type) != 'number' && type.opcode != kWasmRefNull) {
+ throw new Error("Non-defaultable type");
+ }
+ let heap_type = (typeof type) == 'number' ? type : type.heap_type;
+ return [kExprRefNull, ...wasmSignedLeb(heap_type, kMaxVarInt32Size)];
+ }
+ }
+
+ addGlobal(type, mutable, init) {
+ if (init === undefined) init = WasmModuleBuilder.defaultFor(type);
+ checkExpr(init);
+ let glob = new WasmGlobalBuilder(this, type, mutable, init);
+ glob.index = this.globals.length + this.num_imported_globals;
+ this.globals.push(glob);
+ return glob;
+ }
+
+ addTable(type, initial_size, max_size = undefined, init_expr = undefined) {
+ if (type == kWasmI32 || type == kWasmI64 || type == kWasmF32 ||
+ type == kWasmF64 || type == kWasmS128 || type == kWasmStmt) {
+ throw new Error('Tables must be of a reference type');
+ }
+ if (init_expr != undefined) checkExpr(init_expr);
+ let table = new WasmTableBuilder(
+ this, type, initial_size, max_size, init_expr);
+ table.index = this.tables.length + this.num_imported_tables;
+ this.tables.push(table);
+ return table;
+ }
+
+ addTag(type) {
+ let type_index = (typeof type) == "number" ? type : this.addType(type);
+ let tag_index = this.tags.length + this.num_imported_tags;
+ this.tags.push(type_index);
+ return tag_index;
+ }
+
+ addFunction(name, type) {
+ let type_index = (typeof type) == "number" ? type : this.addType(type);
+ let func = new WasmFunctionBuilder(this, name, type_index);
+ func.index = this.functions.length + this.num_imported_funcs;
+ this.functions.push(func);
+ return func;
+ }
+
+ addImport(module, name, type) {
+ if (this.functions.length != 0) {
+ throw new Error('Imported functions must be declared before local ones');
+ }
+ let type_index = (typeof type) == "number" ? type : this.addType(type);
+ this.imports.push({module: module, name: name, kind: kExternalFunction,
+ type: type_index});
+ return this.num_imported_funcs++;
+ }
+
+ addImportedGlobal(module, name, type, mutable = false) {
+ if (this.globals.length != 0) {
+ throw new Error('Imported globals must be declared before local ones');
+ }
+ let o = {module: module, name: name, kind: kExternalGlobal, type: type,
+ mutable: mutable};
+ this.imports.push(o);
+ return this.num_imported_globals++;
+ }
+
+ addImportedMemory(module, name, initial = 0, maximum, shared) {
+ let o = {module: module, name: name, kind: kExternalMemory,
+ initial: initial, maximum: maximum, shared: shared};
+ this.imports.push(o);
+ return this;
+ }
+
+ addImportedTable(module, name, initial, maximum, type) {
+ if (this.tables.length != 0) {
+ throw new Error('Imported tables must be declared before local ones');
+ }
+ let o = {module: module, name: name, kind: kExternalTable, initial: initial,
+ maximum: maximum, type: type || kWasmAnyFunctionTypeForm};
+ this.imports.push(o);
+ return this.num_imported_tables++;
+ }
+
+ addImportedTag(module, name, type) {
+ if (this.tags.length != 0) {
+ throw new Error('Imported tags must be declared before local ones');
+ }
+ let type_index = (typeof type) == "number" ? type : this.addType(type);
+ let o = {module: module, name: name, kind: kExternalTag, type: type_index};
+ this.imports.push(o);
+ return this.num_imported_tags++;
+ }
+
+ addExport(name, index) {
+ this.exports.push({name: name, kind: kExternalFunction, index: index});
+ return this;
+ }
+
+ addExportOfKind(name, kind, index) {
+ this.exports.push({name: name, kind: kind, index: index});
+ return this;
+ }
+
+ addDataSegment(addr, data, is_global = false) {
+ this.data_segments.push(
+ {addr: addr, data: data, is_global: is_global, is_active: true});
+ return this.data_segments.length - 1;
+ }
+
+ addPassiveDataSegment(data) {
+ this.data_segments.push({data: data, is_active: false});
+ return this.data_segments.length - 1;
+ }
+
+ exportMemoryAs(name) {
+ this.exports.push({name: name, kind: kExternalMemory, index: 0});
+ }
+
+ addElementSegment(table, base, is_global, array) {
+ this.element_segments.push({table: table, base: base, is_global: is_global,
+ array: array, is_active: true});
+ return this;
+ }
+
+ addPassiveElementSegment(array, is_import = false) {
+ this.element_segments.push({array: array, is_active: false});
+ return this;
+ }
+
+ appendToTable(array) {
+ for (let n of array) {
+ if (typeof n != 'number')
+ throw new Error('invalid table (entries have to be numbers): ' + array);
+ }
+ if (this.tables.length == 0) {
+ this.addTable(kWasmAnyFunc, 0);
+ }
+ // Adjust the table to the correct size.
+ let table = this.tables[0];
+ const base = table.initial_size;
+ const table_size = base + array.length;
+ table.initial_size = table_size;
+ if (table.has_max && table_size > table.max_size) {
+ table.max_size = table_size;
+ }
+ return this.addElementSegment(0, base, false, array);
+ }
+
+ setTableBounds(min, max = undefined) {
+ if (this.tables.length != 0) {
+ throw new Error("The table bounds of table '0' have already been set.");
+ }
+ this.addTable(kWasmAnyFunc, min, max);
+ return this;
+ }
+
+ startRecGroup() {
+ this.rec_groups.push({start: this.types.length, size: 0});
+ }
+
+ endRecGroup() {
+ if (this.rec_groups.length == 0) {
+ throw new Error("Did not start a recursive group before ending one")
+ }
+ let last_element = this.rec_groups[this.rec_groups.length - 1]
+ if (last_element.size != 0) {
+ throw new Error("Did not start a recursive group before ending one")
+ }
+ last_element.size = this.types.length - last_element.start;
+ }
+
+ setName(name) {
+ this.name = name;
+ return this;
+ }
+
+ toBuffer(debug = false) {
+ let binary = new Binary;
+ let wasm = this;
+
+ // Add header
+ binary.emit_header();
+
+ // Add type section
+ if (wasm.types.length > 0) {
+ if (debug) print('emitting types @ ' + binary.length);
+ binary.emit_section(kTypeSectionCode, section => {
+ let length_with_groups = wasm.types.length;
+ for (let group of wasm.rec_groups) {
+ length_with_groups -= group.size - 1;
+ }
+ section.emit_u32v(length_with_groups);
+
+ let rec_group_index = 0;
+
+ for (let i = 0; i < wasm.types.length; i++) {
+ if (rec_group_index < wasm.rec_groups.length &&
+ wasm.rec_groups[rec_group_index].start == i) {
+ section.emit_u8(kWasmRecursiveTypeGroupForm);
+ section.emit_u32v(wasm.rec_groups[rec_group_index].size);
+ rec_group_index++;
+ }
+
+ let type = wasm.types[i];
+ if (type.supertype != kNoSuperType) {
+ section.emit_u8(type.is_final ? kWasmSubtypeFinalForm
+ : kWasmSubtypeForm);
+ section.emit_u8(1); // supertype count
+ section.emit_u32v(type.supertype);
+ } else if (!type.is_final) {
+ section.emit_u8(kWasmSubtypeForm);
+ section.emit_u8(0); // no supertypes
+ }
+ if (type instanceof WasmStruct) {
+ section.emit_u8(kWasmStructTypeForm);
+ section.emit_u32v(type.fields.length);
+ for (let field of type.fields) {
+ section.emit_type(field.type);
+ section.emit_u8(field.mutability ? 1 : 0);
+ }
+ } else if (type instanceof WasmArray) {
+ section.emit_u8(kWasmArrayTypeForm);
+ section.emit_type(type.type);
+ section.emit_u8(type.mutability ? 1 : 0);
+ } else {
+ section.emit_u8(kWasmFunctionTypeForm);
+ section.emit_u32v(type.params.length);
+ for (let param of type.params) {
+ section.emit_type(param);
+ }
+ section.emit_u32v(type.results.length);
+ for (let result of type.results) {
+ section.emit_type(result);
+ }
+ }
+ }
+ });
+ }
+
+ // Add imports section
+ if (wasm.imports.length > 0) {
+ if (debug) print("emitting imports @ " + binary.length);
+ binary.emit_section(kImportSectionCode, section => {
+ section.emit_u32v(wasm.imports.length);
+ for (let imp of wasm.imports) {
+ section.emit_string(imp.module);
+ section.emit_string(imp.name || '');
+ section.emit_u8(imp.kind);
+ if (imp.kind == kExternalFunction) {
+ section.emit_u32v(imp.type_index);
+ } else if (imp.kind == kExternalGlobal) {
+ section.emit_type(imp.type);
+ section.emit_u8(imp.mutable);
+ } else if (imp.kind == kExternalMemory) {
+ var has_max = (typeof imp.maximum) != "undefined";
+ var is_shared = (typeof imp.shared) != "undefined";
+ if (is_shared) {
+ section.emit_u8(has_max ? 3 : 2); // flags
+ } else {
+ section.emit_u8(has_max ? 1 : 0); // flags
+ }
+ section.emit_u32v(imp.initial); // initial
+ if (has_max) section.emit_u32v(imp.maximum); // maximum
+ } else if (imp.kind == kExternalTable) {
+ section.emit_type(imp.type);
+ var has_max = (typeof imp.maximum) != "undefined";
+ section.emit_u8(has_max ? 1 : 0); // flags
+ section.emit_u32v(imp.initial); // initial
+ if (has_max) section.emit_u32v(imp.maximum); // maximum
+ } else if (imp.kind == kExternalTag) {
+ section.emit_u32v(kTagAttribute);
+ section.emit_u32v(imp.type);
+ } else {
+ throw new Error("unknown/unsupported import kind " + imp.kind);
+ }
+ }
+ });
+ }
+
+ // Add functions declarations
+ if (wasm.functions.length > 0) {
+ if (debug) print("emitting function decls @ " + binary.length);
+ binary.emit_section(kFunctionSectionCode, section => {
+ section.emit_u32v(wasm.functions.length);
+ for (let func of wasm.functions) {
+ section.emit_u32v(func.type_index);
+ }
+ });
+ }
+
+ // Add table section
+ if (wasm.tables.length > 0) {
+ if (debug) print ("emitting tables @ " + binary.length);
+ binary.emit_section(kTableSectionCode, section => {
+ section.emit_u32v(wasm.tables.length);
+ for (let table of wasm.tables) {
+ section.emit_type(table.type);
+ section.emit_u8(table.has_max);
+ section.emit_u32v(table.initial_size);
+ if (table.has_max) section.emit_u32v(table.max_size);
+ if (table.has_init) section.emit_init_expr(table.init_expr);
+ }
+ });
+ }
+
+ // Add memory section
+ if (wasm.memory !== undefined) {
+ if (debug) print("emitting memory @ " + binary.length);
+ binary.emit_section(kMemorySectionCode, section => {
+ section.emit_u8(1); // one memory entry
+ const has_max = wasm.memory.max !== undefined;
+ const is_shared = wasm.memory.shared !== undefined;
+ // Emit flags (bit 0: reszeable max, bit 1: shared memory)
+ if (is_shared) {
+ section.emit_u8(has_max ? kSharedHasMaximumFlag : 2);
+ } else {
+ section.emit_u8(has_max ? kHasMaximumFlag : 0);
+ }
+ section.emit_u32v(wasm.memory.min);
+ if (has_max) section.emit_u32v(wasm.memory.max);
+ });
+ }
+
+ // Add global section.
+ if (wasm.globals.length > 0) {
+ if (debug) print ("emitting globals @ " + binary.length);
+ binary.emit_section(kGlobalSectionCode, section => {
+ section.emit_u32v(wasm.globals.length);
+ for (let global of wasm.globals) {
+ section.emit_type(global.type);
+ section.emit_u8(global.mutable);
+ section.emit_init_expr(global.init);
+ }
+ });
+ }
+
+ // Add tags.
+ if (wasm.tags.length > 0) {
+ if (debug) print("emitting tags @ " + binary.length);
+ binary.emit_section(kTagSectionCode, section => {
+ section.emit_u32v(wasm.tags.length);
+ for (let type of wasm.tags) {
+ section.emit_u32v(kTagAttribute);
+ section.emit_u32v(type);
+ }
+ });
+ }
+
+ // Add export table.
+ var mem_export = (wasm.memory !== undefined && wasm.memory.exp);
+ var exports_count = wasm.exports.length + (mem_export ? 1 : 0);
+ if (exports_count > 0) {
+ if (debug) print("emitting exports @ " + binary.length);
+ binary.emit_section(kExportSectionCode, section => {
+ section.emit_u32v(exports_count);
+ for (let exp of wasm.exports) {
+ section.emit_string(exp.name);
+ section.emit_u8(exp.kind);
+ section.emit_u32v(exp.index);
+ }
+ if (mem_export) {
+ section.emit_string("memory");
+ section.emit_u8(kExternalMemory);
+ section.emit_u8(0);
+ }
+ });
+ }
+
+ // Add start function section.
+ if (wasm.start_index !== undefined) {
+ if (debug) print("emitting start function @ " + binary.length);
+ binary.emit_section(kStartSectionCode, section => {
+ section.emit_u32v(wasm.start_index);
+ });
+ }
+
+ // Add element segments
+ if (wasm.element_segments.length > 0) {
+ if (debug) print("emitting element segments @ " + binary.length);
+ binary.emit_section(kElementSectionCode, section => {
+ var inits = wasm.element_segments;
+ section.emit_u32v(inits.length);
+
+ for (let init of inits) {
+ if (init.is_active) {
+ // Active segment.
+ if (init.table == 0) {
+ section.emit_u32v(kActiveNoIndex);
+ } else {
+ section.emit_u32v(kActiveWithIndex);
+ section.emit_u32v(init.table);
+ }
+ if (init.is_global) {
+ section.emit_u8(kExprGlobalGet);
+ } else {
+ section.emit_u8(kExprI32Const);
+ }
+ section.emit_u32v(init.base);
+ section.emit_u8(kExprEnd);
+ if (init.table != 0) {
+ section.emit_u8(kExternalFunction);
+ }
+ section.emit_u32v(init.array.length);
+ for (let index of init.array) {
+ section.emit_u32v(index);
+ }
+ } else {
+ // Passive segment.
+ section.emit_u8(kPassiveWithElements); // flags
+ section.emit_u8(kWasmAnyFunc);
+ section.emit_u32v(init.array.length);
+ for (let index of init.array) {
+ if (index === null) {
+ section.emit_u8(kExprRefNull);
+ section.emit_u8(kExprEnd);
+ } else {
+ section.emit_u8(kExprRefFunc);
+ section.emit_u32v(index);
+ section.emit_u8(kExprEnd);
+ }
+ }
+ }
+ }
+ });
+ }
+
+ // If there are any passive data segments, add the DataCount section.
+ if (wasm.data_segments.some(seg => !seg.is_active)) {
+ binary.emit_section(kDataCountSectionCode, section => {
+ section.emit_u32v(wasm.data_segments.length);
+ });
+ }
+
+ // Add function bodies.
+ if (wasm.functions.length > 0) {
+ // emit function bodies
+ if (debug) print("emitting code @ " + binary.length);
+ binary.emit_section(kCodeSectionCode, section => {
+ section.emit_u32v(wasm.functions.length);
+ let header = new Binary;
+ for (let func of wasm.functions) {
+ header.reset();
+ // Function body length will be patched later.
+ let local_decls = [];
+ for (let l of func.locals || []) {
+ if (l.i32_count > 0) {
+ local_decls.push({count: l.i32_count, type: kWasmI32});
+ }
+ if (l.i64_count > 0) {
+ local_decls.push({count: l.i64_count, type: kWasmI64});
+ }
+ if (l.f32_count > 0) {
+ local_decls.push({count: l.f32_count, type: kWasmF32});
+ }
+ if (l.f64_count > 0) {
+ local_decls.push({count: l.f64_count, type: kWasmF64});
+ }
+ if (l.s128_count > 0) {
+ local_decls.push({count: l.s128_count, type: kWasmS128});
+ }
+ if (l.anyref_count > 0) {
+ local_decls.push({count: l.anyref_count, type: kWasmExternRef});
+ }
+ if (l.anyfunc_count > 0) {
+ local_decls.push({count: l.anyfunc_count, type: kWasmAnyFunc});
+ }
+ }
+
+ header.emit_u32v(local_decls.length);
+ for (let decl of local_decls) {
+ header.emit_u32v(decl.count);
+ header.emit_type(decl.type);
+ }
+
+ section.emit_u32v(header.length + func.body.length);
+ section.emit_bytes(header.trunc_buffer());
+ section.emit_bytes(func.body);
+ }
+ });
+ }
+
+ // Add data segments.
+ if (wasm.data_segments.length > 0) {
+ if (debug) print("emitting data segments @ " + binary.length);
+ binary.emit_section(kDataSectionCode, section => {
+ section.emit_u32v(wasm.data_segments.length);
+ for (let seg of wasm.data_segments) {
+ if (seg.is_active) {
+ section.emit_u8(0); // linear memory index 0 / flags
+ if (seg.is_global) {
+ // initializer is a global variable
+ section.emit_u8(kExprGlobalGet);
+ section.emit_u32v(seg.addr);
+ } else {
+ // initializer is a constant
+ section.emit_u8(kExprI32Const);
+ section.emit_u32v(seg.addr);
+ }
+ section.emit_u8(kExprEnd);
+ } else {
+ section.emit_u8(kPassive); // flags
+ }
+ section.emit_u32v(seg.data.length);
+ section.emit_bytes(seg.data);
+ }
+ });
+ }
+
+ // Add any explicitly added sections
+ for (let exp of wasm.explicit) {
+ if (debug) print("emitting explicit @ " + binary.length);
+ binary.emit_bytes(exp);
+ }
+
+ // Add names.
+ let num_function_names = 0;
+ let num_functions_with_local_names = 0;
+ for (let func of wasm.functions) {
+ if (func.name !== undefined) ++num_function_names;
+ if (func.numLocalNames() > 0) ++num_functions_with_local_names;
+ }
+ if (num_function_names > 0 || num_functions_with_local_names > 0 ||
+ wasm.name !== undefined) {
+ if (debug) print('emitting names @ ' + binary.length);
+ binary.emit_section(kUnknownSectionCode, section => {
+ section.emit_string('name');
+ // Emit module name.
+ if (wasm.name !== undefined) {
+ section.emit_section(kModuleNameCode, name_section => {
+ name_section.emit_string(wasm.name);
+ });
+ }
+ // Emit function names.
+ if (num_function_names > 0) {
+ section.emit_section(kFunctionNamesCode, name_section => {
+ name_section.emit_u32v(num_function_names);
+ for (let func of wasm.functions) {
+ if (func.name === undefined) continue;
+ name_section.emit_u32v(func.index);
+ name_section.emit_string(func.name);
+ }
+ });
+ }
+ // Emit local names.
+ if (num_functions_with_local_names > 0) {
+ section.emit_section(kLocalNamesCode, name_section => {
+ name_section.emit_u32v(num_functions_with_local_names);
+ for (let func of wasm.functions) {
+ if (func.numLocalNames() == 0) continue;
+ name_section.emit_u32v(func.index);
+ name_section.emit_u32v(func.numLocalNames());
+ for (let i = 0; i < func.local_names.length; ++i) {
+ if (func.local_names[i] === undefined) continue;
+ name_section.emit_u32v(i);
+ name_section.emit_string(func.local_names[i]);
+ }
+ }
+ });
+ }
+ });
+ }
+
+ return binary.trunc_buffer();
+ }
+
+ toArray(debug = false) {
+ return Array.from(this.toBuffer(debug));
+ }
+
+ instantiate(ffi) {
+ let module = this.toModule();
+ let instance = new WebAssembly.Instance(module, ffi);
+ return instance;
+ }
+
+ asyncInstantiate(ffi) {
+ return WebAssembly.instantiate(this.toBuffer(), ffi)
+ .then(({module, instance}) => instance);
+ }
+
+ toModule(debug = false) {
+ return new WebAssembly.Module(this.toBuffer(debug));
+ }
+}
+globalThis.WasmModuleBuilder = WasmModuleBuilder;
+
+function wasmSignedLeb(val, max_len = 5) {
+ let res = [];
+ for (let i = 0; i < max_len; ++i) {
+ let v = val & 0x7f;
+ // If {v} sign-extended from 7 to 32 bits is equal to val, we are done.
+ if (((v << 25) >> 25) == val) {
+ res.push(v);
+ return res;
+ }
+ res.push(v | 0x80);
+ val = val >> 7;
+ }
+ throw new Error(
+ 'Leb value <' + val + '> exceeds maximum length of ' + max_len);
+}
+globalThis.wasmSignedLeb = wasmSignedLeb;
+
+function wasmI32Const(val) {
+ return [kExprI32Const, ...wasmSignedLeb(val, 5)];
+}
+globalThis.wasmI32Const = wasmI32Const;
+
+function wasmF32Const(f) {
+ // Write in little-endian order at offset 0.
+ data_view.setFloat32(0, f, true);
+ return [
+ kExprF32Const, byte_view[0], byte_view[1], byte_view[2], byte_view[3]
+ ];
+}
+globalThis.wasmI32Const = wasmI32Const;
+
+function wasmF64Const(f) {
+ // Write in little-endian order at offset 0.
+ data_view.setFloat64(0, f, true);
+ return [
+ kExprF64Const, byte_view[0], byte_view[1], byte_view[2],
+ byte_view[3], byte_view[4], byte_view[5], byte_view[6], byte_view[7]
+ ];
+}
+globalThis.wasmF64Const = wasmF64Const;
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-28 15:13:57 +0000