function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
import { CompileError } from "@webassemblyjs/helper-api-error";
import * as ieee754 from "@webassemblyjs/ieee754";
import * as utf8 from "@webassemblyjs/utf8";
import * as t from "@webassemblyjs/ast";
import { decodeInt32, decodeUInt32, MAX_NUMBER_OF_BYTE_U32, decodeInt64, decodeUInt64, MAX_NUMBER_OF_BYTE_U64 } from "@webassemblyjs/leb128";
import constants from "@webassemblyjs/helper-wasm-bytecode";
function toHex(n) {
return "0x" + Number(n).toString(16);
}
function byteArrayEq(l, r) {
if (l.length !== r.length) {
return false;
}
for (var i = 0; i < l.length; i++) {
if (l[i] !== r[i]) {
return false;
}
}
return true;
}
export function decode(ab, opts) {
var buf = new Uint8Array(ab);
var getUniqueName = t.getUniqueNameGenerator();
var offset = 0;
function getPosition() {
return {
line: -1,
column: offset
};
}
function dump(b, msg) {
if (opts.dump === false) return;
var pad = "\t\t\t\t\t\t\t\t\t\t";
var str = "";
if (b.length < 5) {
str = b.map(toHex).join(" ");
} else {
str = "...";
}
console.log(toHex(offset) + ":\t", str, pad, ";", msg);
}
function dumpSep(msg) {
if (opts.dump === false) return;
console.log(";", msg);
}
/**
* TODO(sven): we can atually use a same structure
* we are adding incrementally new features
*/
var state = {
elementsInFuncSection: [],
elementsInExportSection: [],
elementsInCodeSection: [],
/**
* Decode memory from:
* - Memory section
*/
memoriesInModule: [],
/**
* Decoded types from:
* - Type section
*/
typesInModule: [],
/**
* Decoded functions from:
* - Function section
* - Import section
*/
functionsInModule: [],
/**
* Decoded tables from:
* - Table section
*/
tablesInModule: [],
/**
* Decoded globals from:
* - Global section
*/
globalsInModule: []
};
function isEOF() {
return offset >= buf.length;
}
function eatBytes(n) {
offset = offset + n;
}
function readBytesAtOffset(_offset, numberOfBytes) {
var arr = [];
for (var i = 0; i < numberOfBytes; i++) {
arr.push(buf[_offset + i]);
}
return arr;
}
function readBytes(numberOfBytes) {
return readBytesAtOffset(offset, numberOfBytes);
}
function readF64() {
var bytes = readBytes(ieee754.NUMBER_OF_BYTE_F64);
var value = ieee754.decodeF64(bytes);
if (Math.sign(value) * value === Infinity) {
return {
value: Math.sign(value),
inf: true,
nextIndex: ieee754.NUMBER_OF_BYTE_F64
};
}
if (isNaN(value)) {
var sign = bytes[bytes.length - 1] >> 7 ? -1 : 1;
var mantissa = 0;
for (var i = 0; i < bytes.length - 2; ++i) {
mantissa += bytes[i] * Math.pow(256, i);
}
mantissa += bytes[bytes.length - 2] % 16 * Math.pow(256, bytes.length - 2);
return {
value: sign * mantissa,
nan: true,
nextIndex: ieee754.NUMBER_OF_BYTE_F64
};
}
return {
value: value,
nextIndex: ieee754.NUMBER_OF_BYTE_F64
};
}
function readF32() {
var bytes = readBytes(ieee754.NUMBER_OF_BYTE_F32);
var value = ieee754.decodeF32(bytes);
if (Math.sign(value) * value === Infinity) {
return {
value: Math.sign(value),
inf: true,
nextIndex: ieee754.NUMBER_OF_BYTE_F32
};
}
if (isNaN(value)) {
var sign = bytes[bytes.length - 1] >> 7 ? -1 : 1;
var mantissa = 0;
for (var i = 0; i < bytes.length - 2; ++i) {
mantissa += bytes[i] * Math.pow(256, i);
}
mantissa += bytes[bytes.length - 2] % 128 * Math.pow(256, bytes.length - 2);
return {
value: sign * mantissa,
nan: true,
nextIndex: ieee754.NUMBER_OF_BYTE_F32
};
}
return {
value: value,
nextIndex: ieee754.NUMBER_OF_BYTE_F32
};
}
function readUTF8String() {
var lenu32 = readU32(); // Don't eat any bytes. Instead, peek ahead of the current offset using
// readBytesAtOffset below. This keeps readUTF8String neutral with respect
// to the current offset, just like the other readX functions.
var strlen = lenu32.value;
dump([strlen], "string length");
var bytes = readBytesAtOffset(offset + lenu32.nextIndex, strlen);
var value = utf8.decode(bytes);
return {
value: value,
nextIndex: strlen + lenu32.nextIndex
};
}
/**
* Decode an unsigned 32bits integer
*
* The length will be handled by the leb librairy, we pass the max number of
* byte.
*/
function readU32() {
var bytes = readBytes(MAX_NUMBER_OF_BYTE_U32);
var buffer = Buffer.from(bytes);
return decodeUInt32(buffer);
}
function readVaruint32() {
// where 32 bits = max 4 bytes
var bytes = readBytes(4);
var buffer = Buffer.from(bytes);
return decodeUInt32(buffer);
}
function readVaruint7() {
// where 7 bits = max 1 bytes
var bytes = readBytes(1);
var buffer = Buffer.from(bytes);
return decodeUInt32(buffer);
}
/**
* Decode a signed 32bits interger
*/
function read32() {
var bytes = readBytes(MAX_NUMBER_OF_BYTE_U32);
var buffer = Buffer.from(bytes);
return decodeInt32(buffer);
}
/**
* Decode a signed 64bits integer
*/
function read64() {
var bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
var buffer = Buffer.from(bytes);
return decodeInt64(buffer);
}
function readU64() {
var bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
var buffer = Buffer.from(bytes);
return decodeUInt64(buffer);
}
function readByte() {
return readBytes(1)[0];
}
function parseModuleHeader() {
if (isEOF() === true || offset + 4 > buf.length) {
throw new Error("unexpected end");
}
var header = readBytes(4);
if (byteArrayEq(constants.magicModuleHeader, header) === false) {
throw new CompileError("magic header not detected");
}
dump(header, "wasm magic header");
eatBytes(4);
}
function parseVersion() {
if (isEOF() === true || offset + 4 > buf.length) {
throw new Error("unexpected end");
}
var version = readBytes(4);
if (byteArrayEq(constants.moduleVersion, version) === false) {
throw new CompileError("unknown binary version");
}
dump(version, "wasm version");
eatBytes(4);
}
function parseVec(cast) {
var u32 = readU32();
var length = u32.value;
eatBytes(u32.nextIndex);
dump([length], "number");
if (length === 0) {
return [];
}
var elements = [];
for (var i = 0; i < length; i++) {
var byte = readByte();
eatBytes(1);
var value = cast(byte);
dump([byte], value);
if (typeof value === "undefined") {
throw new CompileError("Internal failure: parseVec could not cast the value");
}
elements.push(value);
}
return elements;
} // Type section
// https://webassembly.github.io/spec/binary/modules.html#binary-typesec
function parseTypeSection(numberOfTypes) {
var typeInstructionNodes = [];
dump([numberOfTypes], "num types");
for (var i = 0; i < numberOfTypes; i++) {
var _startLoc = getPosition();
dumpSep("type " + i);
var type = readByte();
eatBytes(1);
if (type == constants.types.func) {
dump([type], "func");
var paramValtypes = parseVec(function (b) {
return constants.valtypes[b];
});
var params = paramValtypes.map(function (v) {
return t.funcParam(
/*valtype*/
v);
});
var result = parseVec(function (b) {
return constants.valtypes[b];
});
typeInstructionNodes.push(function () {
var endLoc = getPosition();
return t.withLoc(t.typeInstruction(undefined, t.signature(params, result)), endLoc, _startLoc);
}());
state.typesInModule.push({
params: params,
result: result
});
} else {
throw new Error("Unsupported type: " + toHex(type));
}
}
return typeInstructionNodes;
} // Import section
// https://webassembly.github.io/spec/binary/modules.html#binary-importsec
function parseImportSection(numberOfImports) {
var imports = [];
for (var i = 0; i < numberOfImports; i++) {
dumpSep("import header " + i);
var _startLoc2 = getPosition();
/**
* Module name
*/
var moduleName = readUTF8String();
eatBytes(moduleName.nextIndex);
dump([], "module name (".concat(moduleName.value, ")"));
/**
* Name
*/
var name = readUTF8String();
eatBytes(name.nextIndex);
dump([], "name (".concat(name.value, ")"));
/**
* Import descr
*/
var descrTypeByte = readByte();
eatBytes(1);
var descrType = constants.importTypes[descrTypeByte];
dump([descrTypeByte], "import kind");
if (typeof descrType === "undefined") {
throw new CompileError("Unknown import description type: " + toHex(descrTypeByte));
}
var importDescr = void 0;
if (descrType === "func") {
var indexU32 = readU32();
var typeindex = indexU32.value;
eatBytes(indexU32.nextIndex);
dump([typeindex], "type index");
var signature = state.typesInModule[typeindex];
if (typeof signature === "undefined") {
throw new CompileError("function signature not found (".concat(typeindex, ")"));
}
var id = getUniqueName("func");
importDescr = t.funcImportDescr(id, t.signature(signature.params, signature.result));
state.functionsInModule.push({
id: t.identifier(name.value),
signature: signature,
isExternal: true
});
} else if (descrType === "global") {
importDescr = parseGlobalType();
var globalNode = t.global(importDescr, []);
state.globalsInModule.push(globalNode);
} else if (descrType === "table") {
importDescr = parseTableType(i);
} else if (descrType === "mem") {
var memoryNode = parseMemoryType(0);
state.memoriesInModule.push(memoryNode);
importDescr = memoryNode;
} else {
throw new CompileError("Unsupported import of type: " + descrType);
}
imports.push(function () {
var endLoc = getPosition();
return t.withLoc(t.moduleImport(moduleName.value, name.value, importDescr), endLoc, _startLoc2);
}());
}
return imports;
} // Function section
// https://webassembly.github.io/spec/binary/modules.html#function-section
function parseFuncSection(numberOfFunctions) {
dump([numberOfFunctions], "num funcs");
for (var i = 0; i < numberOfFunctions; i++) {
var indexU32 = readU32();
var typeindex = indexU32.value;
eatBytes(indexU32.nextIndex);
dump([typeindex], "type index");
var signature = state.typesInModule[typeindex];
if (typeof signature === "undefined") {
throw new CompileError("function signature not found (".concat(typeindex, ")"));
} // preserve anonymous, a name might be resolved later
var id = t.withRaw(t.identifier(getUniqueName("func")), "");
state.functionsInModule.push({
id: id,
signature: signature,
isExternal: false
});
}
} // Export section
// https://webassembly.github.io/spec/binary/modules.html#export-section
function parseExportSection(numberOfExport) {
dump([numberOfExport], "num exports"); // Parse vector of exports
for (var i = 0; i < numberOfExport; i++) {
var _startLoc3 = getPosition();
/**
* Name
*/
var name = readUTF8String();
eatBytes(name.nextIndex);
dump([], "export name (".concat(name.value, ")"));
/**
* exportdescr
*/
var typeIndex = readByte();
eatBytes(1);
dump([typeIndex], "export kind");
var indexu32 = readU32();
var index = indexu32.value;
eatBytes(indexu32.nextIndex);
dump([index], "export index");
var id = void 0,
signature = void 0;
if (constants.exportTypes[typeIndex] === "Func") {
var func = state.functionsInModule[index];
if (typeof func === "undefined") {
throw new CompileError("unknown function (".concat(index, ")"));
}
id = t.numberLiteralFromRaw(index, String(index));
signature = func.signature;
} else if (constants.exportTypes[typeIndex] === "Table") {
var table = state.tablesInModule[index];
if (typeof table === "undefined") {
throw new CompileError("unknown table ".concat(index));
}
id = t.numberLiteralFromRaw(index, String(index));
signature = null;
} else if (constants.exportTypes[typeIndex] === "Mem") {
var memNode = state.memoriesInModule[index];
if (typeof memNode === "undefined") {
throw new CompileError("unknown memory ".concat(index));
}
id = t.numberLiteralFromRaw(index, String(index));
signature = null;
} else if (constants.exportTypes[typeIndex] === "Global") {
var global = state.globalsInModule[index];
if (typeof global === "undefined") {
throw new CompileError("unknown global ".concat(index));
}
id = t.numberLiteralFromRaw(index, String(index));
signature = null;
} else {
console.warn("Unsupported export type: " + toHex(typeIndex));
return;
}
var endLoc = getPosition();
state.elementsInExportSection.push({
name: name.value,
type: constants.exportTypes[typeIndex],
signature: signature,
id: id,
index: index,
endLoc: endLoc,
startLoc: _startLoc3
});
}
} // Code section
// https://webassembly.github.io/spec/binary/modules.html#code-section
function parseCodeSection(numberOfFuncs) {
dump([numberOfFuncs], "number functions"); // Parse vector of function
for (var i = 0; i < numberOfFuncs; i++) {
var _startLoc4 = getPosition();
dumpSep("function body " + i); // the u32 size of the function code in bytes
// Ignore it for now
var bodySizeU32 = readU32();
eatBytes(bodySizeU32.nextIndex);
dump([bodySizeU32.value], "function body size");
var code = [];
/**
* Parse locals
*/
var funcLocalNumU32 = readU32();
var funcLocalNum = funcLocalNumU32.value;
eatBytes(funcLocalNumU32.nextIndex);
dump([funcLocalNum], "num locals");
var locals = [];
for (var _i = 0; _i < funcLocalNum; _i++) {
var _startLoc5 = getPosition();
var localCountU32 = readU32();
var localCount = localCountU32.value;
eatBytes(localCountU32.nextIndex);
dump([localCount], "num local");
var valtypeByte = readByte();
eatBytes(1);
var type = constants.valtypes[valtypeByte];
var args = [];
for (var _i2 = 0; _i2 < localCount; _i2++) {
args.push(t.valtypeLiteral(type));
}
var localNode = function () {
var endLoc = getPosition();
return t.withLoc(t.instruction("local", args), endLoc, _startLoc5);
}();
locals.push(localNode);
dump([valtypeByte], type);
if (typeof type === "undefined") {
throw new CompileError("Unexpected valtype: " + toHex(valtypeByte));
}
}
code.push.apply(code, locals); // Decode instructions until the end
parseInstructionBlock(code);
var endLoc = getPosition();
state.elementsInCodeSection.push({
code: code,
locals: locals,
endLoc: endLoc,
startLoc: _startLoc4,
bodySize: bodySizeU32.value
});
}
}
function parseInstructionBlock(code) {
while (true) {
var _startLoc6 = getPosition();
var instructionAlreadyCreated = false;
var instructionByte = readByte();
eatBytes(1);
if (instructionByte === 0xfe) {
instructionByte = 0xfe00 + readByte();
eatBytes(1);
}
var instruction = constants.symbolsByByte[instructionByte];
if (typeof instruction === "undefined") {
throw new CompileError("Unexpected instruction: " + toHex(instructionByte));
}
if (typeof instruction.object === "string") {
dump([instructionByte], "".concat(instruction.object, ".").concat(instruction.name));
} else {
dump([instructionByte], instruction.name);
}
/**
* End of the function
*/
if (instruction.name === "end") {
var node = function () {
var endLoc = getPosition();
return t.withLoc(t.instruction(instruction.name), endLoc, _startLoc6);
}();
code.push(node);
break;
}
var args = [];
if (instruction.name === "loop") {
var _startLoc7 = getPosition();
var blocktypeByte = readByte();
eatBytes(1);
var blocktype = constants.blockTypes[blocktypeByte];
dump([blocktypeByte], "blocktype");
if (typeof blocktype === "undefined") {
throw new CompileError("Unexpected blocktype: " + toHex(blocktypeByte));
}
var instr = [];
parseInstructionBlock(instr); // preserve anonymous
var label = t.withRaw(t.identifier(getUniqueName("loop")), "");
var loopNode = function () {
var endLoc = getPosition();
return t.withLoc(t.loopInstruction(label, blocktype, instr), endLoc, _startLoc7);
}();
code.push(loopNode);
instructionAlreadyCreated = true;
} else if (instruction.name === "if") {
var _startLoc8 = getPosition();
var _blocktypeByte = readByte();
eatBytes(1);
var _blocktype = constants.blockTypes[_blocktypeByte];
dump([_blocktypeByte], "blocktype");
if (typeof _blocktype === "undefined") {
throw new CompileError("Unexpected blocktype: " + toHex(_blocktypeByte));
}
var testIndex = t.withRaw(t.identifier(getUniqueName("if")), "");
var ifBody = [];
parseInstructionBlock(ifBody); // Defaults to no alternate
var elseIndex = 0;
for (elseIndex = 0; elseIndex < ifBody.length; ++elseIndex) {
var _instr = ifBody[elseIndex];
if (_instr.type === "Instr" && _instr.id === "else") {
break;
}
}
var consequentInstr = ifBody.slice(0, elseIndex);
var alternate = ifBody.slice(elseIndex + 1); // wast sugar
var testInstrs = [];
var ifNode = function () {
var endLoc = getPosition();
return t.withLoc(t.ifInstruction(testIndex, testInstrs, _blocktype, consequentInstr, alternate), endLoc, _startLoc8);
}();
code.push(ifNode);
instructionAlreadyCreated = true;
} else if (instruction.name === "block") {
var _startLoc9 = getPosition();
var _blocktypeByte2 = readByte();
eatBytes(1);
var _blocktype2 = constants.blockTypes[_blocktypeByte2];
dump([_blocktypeByte2], "blocktype");
if (typeof _blocktype2 === "undefined") {
throw new CompileError("Unexpected blocktype: " + toHex(_blocktypeByte2));
}
var _instr2 = [];
parseInstructionBlock(_instr2); // preserve anonymous
var _label = t.withRaw(t.identifier(getUniqueName("block")), "");
var blockNode = function () {
var endLoc = getPosition();
return t.withLoc(t.blockInstruction(_label, _instr2, _blocktype2), endLoc, _startLoc9);
}();
code.push(blockNode);
instructionAlreadyCreated = true;
} else if (instruction.name === "call") {
var indexu32 = readU32();
var index = indexu32.value;
eatBytes(indexu32.nextIndex);
dump([index], "index");
var callNode = function () {
var endLoc = getPosition();
return t.withLoc(t.callInstruction(t.indexLiteral(index)), endLoc, _startLoc6);
}();
code.push(callNode);
instructionAlreadyCreated = true;
} else if (instruction.name === "call_indirect") {
var _startLoc10 = getPosition();
var indexU32 = readU32();
var typeindex = indexU32.value;
eatBytes(indexU32.nextIndex);
dump([typeindex], "type index");
var signature = state.typesInModule[typeindex];
if (typeof signature === "undefined") {
throw new CompileError("call_indirect signature not found (".concat(typeindex, ")"));
}
var _callNode = t.callIndirectInstruction(t.signature(signature.params, signature.result), []);
var flagU32 = readU32();
var flag = flagU32.value; // 0x00 - reserved byte
eatBytes(flagU32.nextIndex);
if (flag !== 0) {
throw new CompileError("zero flag expected");
}
code.push(function () {
var endLoc = getPosition();
return t.withLoc(_callNode, endLoc, _startLoc10);
}());
instructionAlreadyCreated = true;
} else if (instruction.name === "br_table") {
var indicesu32 = readU32();
var indices = indicesu32.value;
eatBytes(indicesu32.nextIndex);
dump([indices], "num indices");
for (var i = 0; i <= indices; i++) {
var _indexu = readU32();
var _index = _indexu.value;
eatBytes(_indexu.nextIndex);
dump([_index], "index");
args.push(t.numberLiteralFromRaw(_indexu.value.toString(), "u32"));
}
} else if (instructionByte >= 0x28 && instructionByte <= 0x40) {
/**
* Memory instructions
*/
if (instruction.name === "grow_memory" || instruction.name === "current_memory") {
var _indexU = readU32();
var _index2 = _indexU.value;
eatBytes(_indexU.nextIndex);
if (_index2 !== 0) {
throw new Error("zero flag expected");
}
dump([_index2], "index");
} else {
var aligun32 = readU32();
var align = aligun32.value;
eatBytes(aligun32.nextIndex);
dump([align], "align");
var offsetu32 = readU32();
var _offset2 = offsetu32.value;
eatBytes(offsetu32.nextIndex);
dump([_offset2], "offset");
}
} else if (instructionByte >= 0x41 && instructionByte <= 0x44) {
/**
* Numeric instructions
*/
if (instruction.object === "i32") {
var value32 = read32();
var value = value32.value;
eatBytes(value32.nextIndex);
dump([value], "i32 value");
args.push(t.numberLiteralFromRaw(value));
}
if (instruction.object === "u32") {
var valueu32 = readU32();
var _value = valueu32.value;
eatBytes(valueu32.nextIndex);
dump([_value], "u32 value");
args.push(t.numberLiteralFromRaw(_value));
}
if (instruction.object === "i64") {
var value64 = read64();
var _value2 = value64.value;
eatBytes(value64.nextIndex);
dump([Number(_value2.toString())], "i64 value");
var high = _value2.high,
low = _value2.low;
var _node = {
type: "LongNumberLiteral",
value: {
high: high,
low: low
}
};
args.push(_node);
}
if (instruction.object === "u64") {
var valueu64 = readU64();
var _value3 = valueu64.value;
eatBytes(valueu64.nextIndex);
dump([Number(_value3.toString())], "u64 value");
var _high = _value3.high,
_low = _value3.low;
var _node2 = {
type: "LongNumberLiteral",
value: {
high: _high,
low: _low
}
};
args.push(_node2);
}
if (instruction.object === "f32") {
var valuef32 = readF32();
var _value4 = valuef32.value;
eatBytes(valuef32.nextIndex);
dump([_value4], "f32 value");
args.push( // $FlowIgnore
t.floatLiteral(_value4, valuef32.nan, valuef32.inf, String(_value4)));
}
if (instruction.object === "f64") {
var valuef64 = readF64();
var _value5 = valuef64.value;
eatBytes(valuef64.nextIndex);
dump([_value5], "f64 value");
args.push( // $FlowIgnore
t.floatLiteral(_value5, valuef64.nan, valuef64.inf, String(_value5)));
}
} else if (instructionByte >= 0xfe00 && instructionByte <= 0xfeff) {
/**
* Atomic memory instructions
*/
var align32 = readU32();
var _align = align32.value;
eatBytes(align32.nextIndex);
dump([_align], "align");
var _offsetu = readU32();
var _offset3 = _offsetu.value;
eatBytes(_offsetu.nextIndex);
dump([_offset3], "offset");
} else {
for (var _i3 = 0; _i3 < instruction.numberOfArgs; _i3++) {
var u32 = readU32();
eatBytes(u32.nextIndex);
dump([u32.value], "argument " + _i3);
args.push(t.numberLiteralFromRaw(u32.value));
}
}
if (instructionAlreadyCreated === false) {
if (typeof instruction.object === "string") {
var _node3 = function () {
var endLoc = getPosition();
return t.withLoc(t.objectInstruction(instruction.name, instruction.object, args), endLoc, _startLoc6);
}();
code.push(_node3);
} else {
var _node4 = function () {
var endLoc = getPosition();
return t.withLoc(t.instruction(instruction.name, args), endLoc, _startLoc6);
}();
code.push(_node4);
}
}
}
} // https://webassembly.github.io/spec/core/binary/types.html#limits
function parseLimits() {
var limitType = readByte();
eatBytes(1);
var shared = limitType === 0x03;
dump([limitType], "limit type" + (shared ? " (shared)" : ""));
var min, max;
if (limitType === 0x01 || limitType === 0x03 // shared limits
) {
var u32min = readU32();
min = parseInt(u32min.value);
eatBytes(u32min.nextIndex);
dump([min], "min");
var u32max = readU32();
max = parseInt(u32max.value);
eatBytes(u32max.nextIndex);
dump([max], "max");
}
if (limitType === 0x00) {
var _u32min = readU32();
min = parseInt(_u32min.value);
eatBytes(_u32min.nextIndex);
dump([min], "min");
}
return t.limit(min, max, shared);
} // https://webassembly.github.io/spec/core/binary/types.html#binary-tabletype
function parseTableType(index) {
var name = t.withRaw(t.identifier(getUniqueName("table")), String(index));
var elementTypeByte = readByte();
eatBytes(1);
dump([elementTypeByte], "element type");
var elementType = constants.tableTypes[elementTypeByte];
if (typeof elementType === "undefined") {
throw new CompileError("Unknown element type in table: " + toHex(elementType));
}
var limits = parseLimits();
return t.table(elementType, limits, name);
} // https://webassembly.github.io/spec/binary/types.html#global-types
function parseGlobalType() {
var valtypeByte = readByte();
eatBytes(1);
var type = constants.valtypes[valtypeByte];
dump([valtypeByte], type);
if (typeof type === "undefined") {
throw new CompileError("Unknown valtype: " + toHex(valtypeByte));
}
var globalTypeByte = readByte();
eatBytes(1);
var globalType = constants.globalTypes[globalTypeByte];
dump([globalTypeByte], "global type (".concat(globalType, ")"));
if (typeof globalType === "undefined") {
throw new CompileError("Invalid mutability: " + toHex(globalTypeByte));
}
return t.globalType(type, globalType);
} // function parseNameModule() {
// const lenu32 = readVaruint32();
// eatBytes(lenu32.nextIndex);
// console.log("len", lenu32);
// const strlen = lenu32.value;
// dump([strlen], "string length");
// const bytes = readBytes(strlen);
// eatBytes(strlen);
// const value = utf8.decode(bytes);
// return [t.moduleNameMetadata(value)];
// }
// this section contains an array of function names and indices
function parseNameSectionFunctions() {
var functionNames = [];
var numberOfFunctionsu32 = readU32();
var numbeOfFunctions = numberOfFunctionsu32.value;
eatBytes(numberOfFunctionsu32.nextIndex);
for (var i = 0; i < numbeOfFunctions; i++) {
var indexu32 = readU32();
var index = indexu32.value;
eatBytes(indexu32.nextIndex);
var name = readUTF8String();
eatBytes(name.nextIndex);
functionNames.push(t.functionNameMetadata(name.value, index));
}
return functionNames;
}
function parseNameSectionLocals() {
var localNames = [];
var numbeOfFunctionsu32 = readU32();
var numbeOfFunctions = numbeOfFunctionsu32.value;
eatBytes(numbeOfFunctionsu32.nextIndex);
for (var i = 0; i < numbeOfFunctions; i++) {
var functionIndexu32 = readU32();
var functionIndex = functionIndexu32.value;
eatBytes(functionIndexu32.nextIndex);
var numLocalsu32 = readU32();
var numLocals = numLocalsu32.value;
eatBytes(numLocalsu32.nextIndex);
for (var _i4 = 0; _i4 < numLocals; _i4++) {
var localIndexu32 = readU32();
var localIndex = localIndexu32.value;
eatBytes(localIndexu32.nextIndex);
var name = readUTF8String();
eatBytes(name.nextIndex);
localNames.push(t.localNameMetadata(name.value, localIndex, functionIndex));
}
}
return localNames;
} // this is a custom section used for name resolution
// https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md#name-section
function parseNameSection(remainingBytes) {
var nameMetadata = [];
var initialOffset = offset;
while (offset - initialOffset < remainingBytes) {
// name_type
var sectionTypeByte = readVaruint7();
eatBytes(sectionTypeByte.nextIndex); // name_payload_len
var subSectionSizeInBytesu32 = readVaruint32();
eatBytes(subSectionSizeInBytesu32.nextIndex);
switch (sectionTypeByte.value) {
// case 0: {
// TODO(sven): re-enable that
// Current status: it seems that when we decode the module's name
// no name_payload_len is used.
//
// See https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md#name-section
//
// nameMetadata.push(...parseNameModule());
// break;
// }
case 1:
{
nameMetadata.push.apply(nameMetadata, _toConsumableArray(parseNameSectionFunctions()));
break;
}
case 2:
{
nameMetadata.push.apply(nameMetadata, _toConsumableArray(parseNameSectionLocals()));
break;
}
default:
{
// skip unknown subsection
eatBytes(subSectionSizeInBytesu32.value);
}
}
}
return nameMetadata;
} // this is a custom section used for information about the producers
// https://github.com/WebAssembly/tool-conventions/blob/master/ProducersSection.md
function parseProducersSection() {
var metadata = t.producersSectionMetadata([]); // field_count
var sectionTypeByte = readVaruint32();
eatBytes(sectionTypeByte.nextIndex);
dump([sectionTypeByte.value], "num of producers");
var fields = {
language: [],
"processed-by": [],
sdk: []
}; // fields
for (var fieldI = 0; fieldI < sectionTypeByte.value; fieldI++) {
// field_name
var fieldName = readUTF8String();
eatBytes(fieldName.nextIndex); // field_value_count
var valueCount = readVaruint32();
eatBytes(valueCount.nextIndex); // field_values
for (var producerI = 0; producerI < valueCount.value; producerI++) {
var producerName = readUTF8String();
eatBytes(producerName.nextIndex);
var producerVersion = readUTF8String();
eatBytes(producerVersion.nextIndex);
fields[fieldName.value].push(t.producerMetadataVersionedName(producerName.value, producerVersion.value));
}
metadata.producers.push(fields[fieldName.value]);
}
return metadata;
}
function parseGlobalSection(numberOfGlobals) {
var globals = [];
dump([numberOfGlobals], "num globals");
for (var i = 0; i < numberOfGlobals; i++) {
var _startLoc11 = getPosition();
var globalType = parseGlobalType();
/**
* Global expressions
*/
var init = [];
parseInstructionBlock(init);
var node = function () {
var endLoc = getPosition();
return t.withLoc(t.global(globalType, init), endLoc, _startLoc11);
}();
globals.push(node);
state.globalsInModule.push(node);
}
return globals;
}
function parseElemSection(numberOfElements) {
var elems = [];
dump([numberOfElements], "num elements");
for (var i = 0; i < numberOfElements; i++) {
var _startLoc12 = getPosition();
var tableindexu32 = readU32();
var tableindex = tableindexu32.value;
eatBytes(tableindexu32.nextIndex);
dump([tableindex], "table index");
/**
* Parse instructions
*/
var instr = [];
parseInstructionBlock(instr);
/**
* Parse ( vector function index ) *
*/
var indicesu32 = readU32();
var indices = indicesu32.value;
eatBytes(indicesu32.nextIndex);
dump([indices], "num indices");
var indexValues = [];
for (var _i5 = 0; _i5 < indices; _i5++) {
var indexu32 = readU32();
var index = indexu32.value;
eatBytes(indexu32.nextIndex);
dump([index], "index");
indexValues.push(t.indexLiteral(index));
}
var elemNode = function () {
var endLoc = getPosition();
return t.withLoc(t.elem(t.indexLiteral(tableindex), instr, indexValues), endLoc, _startLoc12);
}();
elems.push(elemNode);
}
return elems;
} // https://webassembly.github.io/spec/core/binary/types.html#memory-types
function parseMemoryType(i) {
var limits = parseLimits();
return t.memory(limits, t.indexLiteral(i));
} // https://webassembly.github.io/spec/binary/modules.html#table-section
function parseTableSection(numberOfElements) {
var tables = [];
dump([numberOfElements], "num elements");
for (var i = 0; i < numberOfElements; i++) {
var tablesNode = parseTableType(i);
state.tablesInModule.push(tablesNode);
tables.push(tablesNode);
}
return tables;
} // https://webassembly.github.io/spec/binary/modules.html#memory-section
function parseMemorySection(numberOfElements) {
var memories = [];
dump([numberOfElements], "num elements");
for (var i = 0; i < numberOfElements; i++) {
var memoryNode = parseMemoryType(i);
state.memoriesInModule.push(memoryNode);
memories.push(memoryNode);
}
return memories;
} // https://webassembly.github.io/spec/binary/modules.html#binary-startsec
function parseStartSection() {
var startLoc = getPosition();
var u32 = readU32();
var startFuncIndex = u32.value;
eatBytes(u32.nextIndex);
dump([startFuncIndex], "index");
return function () {
var endLoc = getPosition();
return t.withLoc(t.start(t.indexLiteral(startFuncIndex)), endLoc, startLoc);
}();
} // https://webassembly.github.io/spec/binary/modules.html#data-section
function parseDataSection(numberOfElements) {
var dataEntries = [];
dump([numberOfElements], "num elements");
for (var i = 0; i < numberOfElements; i++) {
var memoryIndexu32 = readU32();
var memoryIndex = memoryIndexu32.value;
eatBytes(memoryIndexu32.nextIndex);
dump([memoryIndex], "memory index");
var instrs = [];
parseInstructionBlock(instrs);
var hasExtraInstrs = instrs.filter(function (i) {
return i.id !== "end";
}).length !== 1;
if (hasExtraInstrs) {
throw new CompileError("data section offset must be a single instruction");
}
var bytes = parseVec(function (b) {
return b;
});
dump([], "init");
dataEntries.push(t.data(t.memIndexLiteral(memoryIndex), instrs[0], t.byteArray(bytes)));
}
return dataEntries;
} // https://webassembly.github.io/spec/binary/modules.html#binary-section
function parseSection(sectionIndex) {
var sectionId = readByte();
eatBytes(1);
if (sectionId >= sectionIndex || sectionIndex === constants.sections.custom) {
sectionIndex = sectionId + 1;
} else {
if (sectionId !== constants.sections.custom) throw new CompileError("Unexpected section: " + toHex(sectionId));
}
var nextSectionIndex = sectionIndex;
var startOffset = offset;
var startLoc = getPosition();
var u32 = readU32();
var sectionSizeInBytes = u32.value;
eatBytes(u32.nextIndex);
var sectionSizeInBytesNode = function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(sectionSizeInBytes), endLoc, startLoc);
}();
switch (sectionId) {
case constants.sections.type:
{
dumpSep("section Type");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc13 = getPosition();
var _u = readU32();
var numberOfTypes = _u.value;
eatBytes(_u.nextIndex);
var _metadata = t.sectionMetadata("type", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfTypes), endLoc, _startLoc13);
}());
var _nodes = parseTypeSection(numberOfTypes);
return {
nodes: _nodes,
metadata: _metadata,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.table:
{
dumpSep("section Table");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc14 = getPosition();
var _u2 = readU32();
var numberOfTable = _u2.value;
eatBytes(_u2.nextIndex);
dump([numberOfTable], "num tables");
var _metadata2 = t.sectionMetadata("table", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfTable), endLoc, _startLoc14);
}());
var _nodes2 = parseTableSection(numberOfTable);
return {
nodes: _nodes2,
metadata: _metadata2,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.import:
{
dumpSep("section Import");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc15 = getPosition();
var numberOfImportsu32 = readU32();
var numberOfImports = numberOfImportsu32.value;
eatBytes(numberOfImportsu32.nextIndex);
dump([numberOfImports], "number of imports");
var _metadata3 = t.sectionMetadata("import", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfImports), endLoc, _startLoc15);
}());
var _nodes3 = parseImportSection(numberOfImports);
return {
nodes: _nodes3,
metadata: _metadata3,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.func:
{
dumpSep("section Function");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc16 = getPosition();
var numberOfFunctionsu32 = readU32();
var numberOfFunctions = numberOfFunctionsu32.value;
eatBytes(numberOfFunctionsu32.nextIndex);
var _metadata4 = t.sectionMetadata("func", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfFunctions), endLoc, _startLoc16);
}());
parseFuncSection(numberOfFunctions);
var _nodes4 = [];
return {
nodes: _nodes4,
metadata: _metadata4,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.export:
{
dumpSep("section Export");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc17 = getPosition();
var _u3 = readU32();
var numberOfExport = _u3.value;
eatBytes(_u3.nextIndex);
var _metadata5 = t.sectionMetadata("export", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfExport), endLoc, _startLoc17);
}());
parseExportSection(numberOfExport);
var _nodes5 = [];
return {
nodes: _nodes5,
metadata: _metadata5,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.code:
{
dumpSep("section Code");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc18 = getPosition();
var _u4 = readU32();
var numberOfFuncs = _u4.value;
eatBytes(_u4.nextIndex);
var _metadata6 = t.sectionMetadata("code", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfFuncs), endLoc, _startLoc18);
}());
if (opts.ignoreCodeSection === true) {
var remainingBytes = sectionSizeInBytes - _u4.nextIndex;
eatBytes(remainingBytes); // eat the entire section
} else {
parseCodeSection(numberOfFuncs);
}
var _nodes6 = [];
return {
nodes: _nodes6,
metadata: _metadata6,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.start:
{
dumpSep("section Start");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _metadata7 = t.sectionMetadata("start", startOffset, sectionSizeInBytesNode);
var _nodes7 = [parseStartSection()];
return {
nodes: _nodes7,
metadata: _metadata7,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.element:
{
dumpSep("section Element");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc19 = getPosition();
var numberOfElementsu32 = readU32();
var numberOfElements = numberOfElementsu32.value;
eatBytes(numberOfElementsu32.nextIndex);
var _metadata8 = t.sectionMetadata("element", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfElements), endLoc, _startLoc19);
}());
var _nodes8 = parseElemSection(numberOfElements);
return {
nodes: _nodes8,
metadata: _metadata8,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.global:
{
dumpSep("section Global");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc20 = getPosition();
var numberOfGlobalsu32 = readU32();
var numberOfGlobals = numberOfGlobalsu32.value;
eatBytes(numberOfGlobalsu32.nextIndex);
var _metadata9 = t.sectionMetadata("global", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(numberOfGlobals), endLoc, _startLoc20);
}());
var _nodes9 = parseGlobalSection(numberOfGlobals);
return {
nodes: _nodes9,
metadata: _metadata9,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.memory:
{
dumpSep("section Memory");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _startLoc21 = getPosition();
var _numberOfElementsu = readU32();
var _numberOfElements = _numberOfElementsu.value;
eatBytes(_numberOfElementsu.nextIndex);
var _metadata10 = t.sectionMetadata("memory", startOffset, sectionSizeInBytesNode, function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(_numberOfElements), endLoc, _startLoc21);
}());
var _nodes10 = parseMemorySection(_numberOfElements);
return {
nodes: _nodes10,
metadata: _metadata10,
nextSectionIndex: nextSectionIndex
};
}
case constants.sections.data:
{
dumpSep("section Data");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _metadata11 = t.sectionMetadata("data", startOffset, sectionSizeInBytesNode);
var _startLoc22 = getPosition();
var _numberOfElementsu2 = readU32();
var _numberOfElements2 = _numberOfElementsu2.value;
eatBytes(_numberOfElementsu2.nextIndex);
_metadata11.vectorOfSize = function () {
var endLoc = getPosition();
return t.withLoc(t.numberLiteralFromRaw(_numberOfElements2), endLoc, _startLoc22);
}();
if (opts.ignoreDataSection === true) {
var _remainingBytes = sectionSizeInBytes - _numberOfElementsu2.nextIndex;
eatBytes(_remainingBytes); // eat the entire section
dumpSep("ignore data (" + sectionSizeInBytes + " bytes)");
return {
nodes: [],
metadata: _metadata11,
nextSectionIndex: nextSectionIndex
};
} else {
var _nodes11 = parseDataSection(_numberOfElements2);
return {
nodes: _nodes11,
metadata: _metadata11,
nextSectionIndex: nextSectionIndex
};
}
}
case constants.sections.custom:
{
dumpSep("section Custom");
dump([sectionId], "section code");
dump([sectionSizeInBytes], "section size");
var _metadata12 = [t.sectionMetadata("custom", startOffset, sectionSizeInBytesNode)];
var sectionName = readUTF8String();
eatBytes(sectionName.nextIndex);
dump([], "section name (".concat(sectionName.value, ")"));
var _remainingBytes2 = sectionSizeInBytes - sectionName.nextIndex;
if (sectionName.value === "name") {
var initialOffset = offset;
try {
_metadata12.push.apply(_metadata12, _toConsumableArray(parseNameSection(_remainingBytes2)));
} catch (e) {
console.warn("Failed to decode custom \"name\" section @".concat(offset, "; ignoring (").concat(e.message, ")."));
eatBytes(offset - (initialOffset + _remainingBytes2));
}
} else if (sectionName.value === "producers") {
var _initialOffset = offset;
try {
_metadata12.push(parseProducersSection());
} catch (e) {
console.warn("Failed to decode custom \"producers\" section @".concat(offset, "; ignoring (").concat(e.message, ")."));
eatBytes(offset - (_initialOffset + _remainingBytes2));
}
} else {
// We don't parse the custom section
eatBytes(_remainingBytes2);
dumpSep("ignore custom " + JSON.stringify(sectionName.value) + " section (" + _remainingBytes2 + " bytes)");
}
return {
nodes: [],
metadata: _metadata12,
nextSectionIndex: nextSectionIndex
};
}
}
throw new CompileError("Unexpected section: " + toHex(sectionId));
}
parseModuleHeader();
parseVersion();
var moduleFields = [];
var sectionIndex = 0;
var moduleMetadata = {
sections: [],
functionNames: [],
localNames: [],
producers: []
};
/**
* All the generate declaration are going to be stored in our state
*/
while (offset < buf.length) {
var _parseSection = parseSection(sectionIndex),
_nodes12 = _parseSection.nodes,
_metadata13 = _parseSection.metadata,
nextSectionIndex = _parseSection.nextSectionIndex;
moduleFields.push.apply(moduleFields, _toConsumableArray(_nodes12));
var metadataArray = Array.isArray(_metadata13) ? _metadata13 : [_metadata13];
metadataArray.forEach(function (metadataItem) {
if (metadataItem.type === "FunctionNameMetadata") {
moduleMetadata.functionNames.push(metadataItem);
} else if (metadataItem.type === "LocalNameMetadata") {
moduleMetadata.localNames.push(metadataItem);
} else if (metadataItem.type === "ProducersSectionMetadata") {
moduleMetadata.producers.push(metadataItem);
} else {
moduleMetadata.sections.push(metadataItem);
}
}); // Ignore custom section
if (nextSectionIndex) {
sectionIndex = nextSectionIndex;
}
}
/**
* Transform the state into AST nodes
*/
var funcIndex = 0;
state.functionsInModule.forEach(function (func) {
var params = func.signature.params;
var result = func.signature.result;
var body = []; // External functions doesn't provide any code, can skip it here
if (func.isExternal === true) {
return;
}
var decodedElementInCodeSection = state.elementsInCodeSection[funcIndex];
if (opts.ignoreCodeSection === false) {
if (typeof decodedElementInCodeSection === "undefined") {
throw new CompileError("func " + toHex(funcIndex) + " code not found");
}
body = decodedElementInCodeSection.code;
}
funcIndex++;
var funcNode = t.func(func.id, t.signature(params, result), body);
if (func.isExternal === true) {
funcNode.isExternal = func.isExternal;
} // Add function position in the binary if possible
if (opts.ignoreCodeSection === false) {
var _startLoc23 = decodedElementInCodeSection.startLoc,
endLoc = decodedElementInCodeSection.endLoc,
bodySize = decodedElementInCodeSection.bodySize;
funcNode = t.withLoc(funcNode, endLoc, _startLoc23);
funcNode.metadata = {
bodySize: bodySize
};
}
moduleFields.push(funcNode);
});
state.elementsInExportSection.forEach(function (moduleExport) {
/**
* If the export has no id, we won't be able to call it from the outside
* so we can omit it
*/
if (moduleExport.id != null) {
moduleFields.push(t.withLoc(t.moduleExport(moduleExport.name, t.moduleExportDescr(moduleExport.type, moduleExport.id)), moduleExport.endLoc, moduleExport.startLoc));
}
});
dumpSep("end of program");
var module = t.module(null, moduleFields, t.moduleMetadata(moduleMetadata.sections, moduleMetadata.functionNames, moduleMetadata.localNames, moduleMetadata.producers));
return t.program([module]);
}