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216 lines
6.8 KiB
216 lines
6.8 KiB
function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
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function _sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
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function _slicedToArray(arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return _sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }
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import { isBlock, isFunc, isIdentifier, numberLiteralFromRaw, traverse } from "../../index";
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import { moduleContextFromModuleAST } from "@webassemblyjs/helper-module-context"; // FIXME(sven): do the same with all block instructions, must be more generic here
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function newUnexpectedFunction(i) {
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return new Error("unknown function at offset: " + i);
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}
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export function transform(ast) {
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var module;
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traverse(ast, {
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Module: function (_Module) {
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function Module(_x) {
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return _Module.apply(this, arguments);
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}
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Module.toString = function () {
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return _Module.toString();
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};
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return Module;
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}(function (path) {
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module = path.node;
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})
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});
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var moduleContext = moduleContextFromModuleAST(module); // Transform the actual instruction in function bodies
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traverse(ast, {
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Func: function (_Func) {
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function Func(_x2) {
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return _Func.apply(this, arguments);
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}
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Func.toString = function () {
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return _Func.toString();
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};
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return Func;
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}(function (path) {
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transformFuncPath(path, moduleContext);
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}),
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Start: function (_Start) {
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function Start(_x3) {
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return _Start.apply(this, arguments);
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}
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Start.toString = function () {
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return _Start.toString();
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};
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return Start;
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}(function (path) {
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var index = path.node.index;
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if (isIdentifier(index) === true) {
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var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
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if (typeof offsetInModule === "undefined") {
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throw newUnexpectedFunction(index.value);
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} // Replace the index Identifier
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// $FlowIgnore: reference?
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path.node.index = numberLiteralFromRaw(offsetInModule);
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}
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})
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});
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}
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function transformFuncPath(funcPath, moduleContext) {
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var funcNode = funcPath.node;
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var signature = funcNode.signature;
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if (signature.type !== "Signature") {
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throw new Error("Function signatures must be denormalised before execution");
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}
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var params = signature.params; // Add func locals in the context
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params.forEach(function (p) {
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return moduleContext.addLocal(p.valtype);
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});
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traverse(funcNode, {
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Instr: function (_Instr) {
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function Instr(_x4) {
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return _Instr.apply(this, arguments);
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}
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Instr.toString = function () {
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return _Instr.toString();
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};
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return Instr;
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}(function (instrPath) {
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var instrNode = instrPath.node;
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/**
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* Local access
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*/
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if (instrNode.id === "get_local" || instrNode.id === "set_local" || instrNode.id === "tee_local") {
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var _instrNode$args = _slicedToArray(instrNode.args, 1),
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firstArg = _instrNode$args[0];
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if (firstArg.type === "Identifier") {
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var offsetInParams = params.findIndex(function (_ref) {
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var id = _ref.id;
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return id === firstArg.value;
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});
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if (offsetInParams === -1) {
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throw new Error("".concat(firstArg.value, " not found in ").concat(instrNode.id, ": not declared in func params"));
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} // Replace the Identifer node by our new NumberLiteral node
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instrNode.args[0] = numberLiteralFromRaw(offsetInParams);
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}
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}
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/**
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* Global access
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*/
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if (instrNode.id === "get_global" || instrNode.id === "set_global") {
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var _instrNode$args2 = _slicedToArray(instrNode.args, 1),
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_firstArg = _instrNode$args2[0];
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if (isIdentifier(_firstArg) === true) {
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var globalOffset = moduleContext.getGlobalOffsetByIdentifier( // $FlowIgnore: reference?
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_firstArg.value);
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if (typeof globalOffset === "undefined") {
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// $FlowIgnore: reference?
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throw new Error("global ".concat(_firstArg.value, " not found in module"));
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} // Replace the Identifer node by our new NumberLiteral node
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instrNode.args[0] = numberLiteralFromRaw(globalOffset);
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}
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}
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/**
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* Labels lookup
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*/
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if (instrNode.id === "br") {
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var _instrNode$args3 = _slicedToArray(instrNode.args, 1),
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_firstArg2 = _instrNode$args3[0];
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if (isIdentifier(_firstArg2) === true) {
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// if the labels is not found it is going to be replaced with -1
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// which is invalid.
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var relativeBlockCount = -1; // $FlowIgnore: reference?
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instrPath.findParent(function (_ref2) {
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var node = _ref2.node;
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if (isBlock(node)) {
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relativeBlockCount++; // $FlowIgnore: reference?
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var name = node.label || node.name;
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if (_typeof(name) === "object") {
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// $FlowIgnore: isIdentifier ensures that
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if (name.value === _firstArg2.value) {
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// Found it
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return false;
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}
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}
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}
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if (isFunc(node)) {
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return false;
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}
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}); // Replace the Identifer node by our new NumberLiteral node
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instrNode.args[0] = numberLiteralFromRaw(relativeBlockCount);
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}
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}
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}),
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/**
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* Func lookup
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*/
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CallInstruction: function (_CallInstruction) {
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function CallInstruction(_x5) {
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return _CallInstruction.apply(this, arguments);
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}
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CallInstruction.toString = function () {
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return _CallInstruction.toString();
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};
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return CallInstruction;
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}(function (_ref3) {
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var node = _ref3.node;
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var index = node.index;
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if (isIdentifier(index) === true) {
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var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
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if (typeof offsetInModule === "undefined") {
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throw newUnexpectedFunction(index.value);
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} // Replace the index Identifier
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// $FlowIgnore: reference?
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node.index = numberLiteralFromRaw(offsetInModule);
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}
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})
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});
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}
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