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378 lines
9.3 KiB
378 lines
9.3 KiB
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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// TODO(sven): add flow in here
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import { isSignature, isNumberLiteral } from "@webassemblyjs/ast";
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export function moduleContextFromModuleAST(m) {
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var moduleContext = new ModuleContext();
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if (!(m.type === "Module")) {
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throw new Error('m.type === "Module"' + " error: " + (undefined || "unknown"));
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}
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m.fields.forEach(function (field) {
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switch (field.type) {
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case "Start":
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{
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moduleContext.setStart(field.index);
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break;
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}
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case "TypeInstruction":
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{
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moduleContext.addType(field);
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break;
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}
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case "Func":
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{
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moduleContext.addFunction(field);
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break;
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}
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case "Global":
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{
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moduleContext.defineGlobal(field);
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break;
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}
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case "ModuleImport":
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{
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switch (field.descr.type) {
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case "GlobalType":
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{
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moduleContext.importGlobal(field.descr.valtype, field.descr.mutability);
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break;
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}
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case "Memory":
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{
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moduleContext.addMemory(field.descr.limits.min, field.descr.limits.max);
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break;
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}
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case "FuncImportDescr":
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{
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moduleContext.importFunction(field.descr);
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break;
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}
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case "Table":
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{
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// FIXME(sven): not implemented yet
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break;
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}
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default:
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throw new Error("Unsupported ModuleImport of type " + JSON.stringify(field.descr.type));
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}
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break;
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}
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case "Memory":
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{
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moduleContext.addMemory(field.limits.min, field.limits.max);
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break;
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}
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}
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});
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return moduleContext;
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}
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/**
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* Module context for type checking
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*/
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export var ModuleContext =
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/*#__PURE__*/
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function () {
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function ModuleContext() {
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_classCallCheck(this, ModuleContext);
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this.funcs = [];
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this.funcsOffsetByIdentifier = [];
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this.types = [];
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this.globals = [];
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this.globalsOffsetByIdentifier = [];
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this.mems = []; // Current stack frame
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this.locals = [];
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this.labels = [];
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this.return = [];
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this.debugName = "unknown";
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this.start = null;
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}
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/**
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* Set start segment
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*/
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_createClass(ModuleContext, [{
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key: "setStart",
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value: function setStart(index) {
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this.start = index.value;
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}
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/**
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* Get start function
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*/
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}, {
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key: "getStart",
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value: function getStart() {
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return this.start;
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}
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/**
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* Reset the active stack frame
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*/
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}, {
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key: "newContext",
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value: function newContext(debugName, expectedResult) {
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this.locals = [];
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this.labels = [expectedResult];
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this.return = expectedResult;
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this.debugName = debugName;
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}
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/**
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* Functions
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*/
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}, {
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key: "addFunction",
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value: function addFunction(func
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/*: Func*/
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) {
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// eslint-disable-next-line prefer-const
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var _ref = func.signature || {},
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_ref$params = _ref.params,
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args = _ref$params === void 0 ? [] : _ref$params,
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_ref$results = _ref.results,
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result = _ref$results === void 0 ? [] : _ref$results;
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args = args.map(function (arg) {
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return arg.valtype;
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});
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this.funcs.push({
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args: args,
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result: result
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});
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if (typeof func.name !== "undefined") {
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this.funcsOffsetByIdentifier[func.name.value] = this.funcs.length - 1;
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}
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}
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}, {
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key: "importFunction",
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value: function importFunction(funcimport) {
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if (isSignature(funcimport.signature)) {
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// eslint-disable-next-line prefer-const
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var _funcimport$signature = funcimport.signature,
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args = _funcimport$signature.params,
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result = _funcimport$signature.results;
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args = args.map(function (arg) {
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return arg.valtype;
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});
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this.funcs.push({
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args: args,
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result: result
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});
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} else {
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if (!isNumberLiteral(funcimport.signature)) {
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throw new Error('isNumberLiteral(funcimport.signature)' + " error: " + (undefined || "unknown"));
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}
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var typeId = funcimport.signature.value;
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if (!this.hasType(typeId)) {
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throw new Error('this.hasType(typeId)' + " error: " + (undefined || "unknown"));
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}
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var signature = this.getType(typeId);
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this.funcs.push({
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args: signature.params.map(function (arg) {
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return arg.valtype;
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}),
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result: signature.results
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});
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}
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if (typeof funcimport.id !== "undefined") {
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// imports are first, we can assume their index in the array
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this.funcsOffsetByIdentifier[funcimport.id.value] = this.funcs.length - 1;
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}
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}
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}, {
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key: "hasFunction",
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value: function hasFunction(index) {
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return typeof this.getFunction(index) !== "undefined";
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}
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}, {
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key: "getFunction",
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value: function getFunction(index) {
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if (typeof index !== "number") {
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throw new Error("getFunction only supported for number index");
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}
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return this.funcs[index];
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}
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}, {
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key: "getFunctionOffsetByIdentifier",
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value: function getFunctionOffsetByIdentifier(name) {
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if (!(typeof name === "string")) {
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throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
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}
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return this.funcsOffsetByIdentifier[name];
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}
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/**
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* Labels
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*/
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}, {
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key: "addLabel",
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value: function addLabel(result) {
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this.labels.unshift(result);
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}
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}, {
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key: "hasLabel",
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value: function hasLabel(index) {
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return this.labels.length > index && index >= 0;
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}
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}, {
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key: "getLabel",
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value: function getLabel(index) {
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return this.labels[index];
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}
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}, {
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key: "popLabel",
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value: function popLabel() {
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this.labels.shift();
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}
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/**
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* Locals
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*/
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}, {
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key: "hasLocal",
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value: function hasLocal(index) {
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return typeof this.getLocal(index) !== "undefined";
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}
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}, {
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key: "getLocal",
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value: function getLocal(index) {
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return this.locals[index];
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}
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}, {
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key: "addLocal",
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value: function addLocal(type) {
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this.locals.push(type);
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}
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/**
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* Types
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*/
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}, {
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key: "addType",
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value: function addType(type) {
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if (!(type.functype.type === "Signature")) {
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throw new Error('type.functype.type === "Signature"' + " error: " + (undefined || "unknown"));
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}
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this.types.push(type.functype);
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}
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}, {
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key: "hasType",
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value: function hasType(index) {
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return this.types[index] !== undefined;
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}
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}, {
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key: "getType",
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value: function getType(index) {
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return this.types[index];
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}
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/**
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* Globals
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*/
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}, {
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key: "hasGlobal",
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value: function hasGlobal(index) {
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return this.globals.length > index && index >= 0;
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}
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}, {
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key: "getGlobal",
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value: function getGlobal(index) {
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return this.globals[index].type;
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}
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}, {
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key: "getGlobalOffsetByIdentifier",
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value: function getGlobalOffsetByIdentifier(name) {
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if (!(typeof name === "string")) {
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throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
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}
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return this.globalsOffsetByIdentifier[name];
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}
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}, {
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key: "defineGlobal",
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value: function defineGlobal(global
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/*: Global*/
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) {
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var type = global.globalType.valtype;
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var mutability = global.globalType.mutability;
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this.globals.push({
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type: type,
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mutability: mutability
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});
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if (typeof global.name !== "undefined") {
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this.globalsOffsetByIdentifier[global.name.value] = this.globals.length - 1;
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}
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}
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}, {
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key: "importGlobal",
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value: function importGlobal(type, mutability) {
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this.globals.push({
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type: type,
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mutability: mutability
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});
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}
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}, {
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key: "isMutableGlobal",
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value: function isMutableGlobal(index) {
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return this.globals[index].mutability === "var";
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}
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}, {
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key: "isImmutableGlobal",
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value: function isImmutableGlobal(index) {
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return this.globals[index].mutability === "const";
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}
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/**
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* Memories
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*/
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}, {
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key: "hasMemory",
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value: function hasMemory(index) {
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return this.mems.length > index && index >= 0;
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}
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}, {
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key: "addMemory",
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value: function addMemory(min, max) {
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this.mems.push({
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min: min,
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max: max
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});
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}
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}, {
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key: "getMemory",
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value: function getMemory(index) {
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return this.mems[index];
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}
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}]);
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return ModuleContext;
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}();
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