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247 lines
6.2 KiB
247 lines
6.2 KiB
import * as decoder from "./decoder";
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import * as t from "@webassemblyjs/ast";
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/**
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* TODO(sven): I added initial props, but we should rather fix
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* https://github.com/xtuc/webassemblyjs/issues/405
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*/
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var defaultDecoderOpts = {
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dump: false,
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ignoreCodeSection: false,
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ignoreDataSection: false,
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ignoreCustomNameSection: false
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}; // traverses the AST, locating function name metadata, which is then
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// used to update index-based identifiers with function names
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function restoreFunctionNames(ast) {
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var functionNames = [];
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t.traverse(ast, {
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FunctionNameMetadata: function FunctionNameMetadata(_ref) {
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var node = _ref.node;
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functionNames.push({
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name: node.value,
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index: node.index
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});
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}
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});
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if (functionNames.length === 0) {
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return;
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}
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t.traverse(ast, {
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Func: function (_Func) {
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function Func(_x) {
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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 (_ref2) {
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var node = _ref2.node;
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// $FlowIgnore
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var nodeName = node.name;
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var indexBasedFunctionName = nodeName.value;
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var index = Number(indexBasedFunctionName.replace("func_", ""));
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var functionName = functionNames.find(function (f) {
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return f.index === index;
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});
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if (functionName) {
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var oldValue = nodeName.value;
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nodeName.value = functionName.name;
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nodeName.numeric = oldValue; // $FlowIgnore
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delete nodeName.raw;
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}
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}),
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// Also update the reference in the export
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ModuleExport: function (_ModuleExport) {
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function ModuleExport(_x2) {
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return _ModuleExport.apply(this, arguments);
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}
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ModuleExport.toString = function () {
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return _ModuleExport.toString();
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};
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return ModuleExport;
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}(function (_ref3) {
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var node = _ref3.node;
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if (node.descr.exportType === "Func") {
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// $FlowIgnore
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var nodeName = node.descr.id;
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var index = nodeName.value;
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var functionName = functionNames.find(function (f) {
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return f.index === index;
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});
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if (functionName) {
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node.descr.id = t.identifier(functionName.name);
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}
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}
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}),
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ModuleImport: function (_ModuleImport) {
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function ModuleImport(_x3) {
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return _ModuleImport.apply(this, arguments);
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}
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ModuleImport.toString = function () {
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return _ModuleImport.toString();
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};
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return ModuleImport;
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}(function (_ref4) {
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var node = _ref4.node;
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if (node.descr.type === "FuncImportDescr") {
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// $FlowIgnore
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var indexBasedFunctionName = node.descr.id;
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var index = Number(indexBasedFunctionName.replace("func_", ""));
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var functionName = functionNames.find(function (f) {
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return f.index === index;
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});
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if (functionName) {
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// $FlowIgnore
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node.descr.id = t.identifier(functionName.name);
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}
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}
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}),
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CallInstruction: function (_CallInstruction) {
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function CallInstruction(_x4) {
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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 (nodePath) {
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var node = nodePath.node;
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var index = node.index.value;
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var functionName = functionNames.find(function (f) {
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return f.index === index;
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});
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if (functionName) {
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var oldValue = node.index;
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node.index = t.identifier(functionName.name);
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node.numeric = oldValue; // $FlowIgnore
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delete node.raw;
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}
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})
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});
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}
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function restoreLocalNames(ast) {
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var localNames = [];
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t.traverse(ast, {
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LocalNameMetadata: function LocalNameMetadata(_ref5) {
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var node = _ref5.node;
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localNames.push({
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name: node.value,
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localIndex: node.localIndex,
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functionIndex: node.functionIndex
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});
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}
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});
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if (localNames.length === 0) {
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return;
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}
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t.traverse(ast, {
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Func: function (_Func2) {
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function Func(_x5) {
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return _Func2.apply(this, arguments);
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}
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Func.toString = function () {
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return _Func2.toString();
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};
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return Func;
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}(function (_ref6) {
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var node = _ref6.node;
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var signature = node.signature;
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if (signature.type !== "Signature") {
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return;
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} // $FlowIgnore
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var nodeName = node.name;
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var indexBasedFunctionName = nodeName.value;
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var functionIndex = Number(indexBasedFunctionName.replace("func_", ""));
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signature.params.forEach(function (param, paramIndex) {
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var paramName = localNames.find(function (f) {
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return f.localIndex === paramIndex && f.functionIndex === functionIndex;
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});
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if (paramName && paramName.name !== "") {
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param.id = paramName.name;
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}
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});
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})
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});
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}
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function restoreModuleName(ast) {
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t.traverse(ast, {
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ModuleNameMetadata: function (_ModuleNameMetadata) {
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function ModuleNameMetadata(_x6) {
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return _ModuleNameMetadata.apply(this, arguments);
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}
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ModuleNameMetadata.toString = function () {
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return _ModuleNameMetadata.toString();
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};
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return ModuleNameMetadata;
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}(function (moduleNameMetadataPath) {
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// update module
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t.traverse(ast, {
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Module: function (_Module) {
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function Module(_x7) {
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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 (_ref7) {
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var node = _ref7.node;
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var name = moduleNameMetadataPath.node.value; // compatiblity with wast-parser
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if (name === "") {
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name = null;
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}
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node.id = name;
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})
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});
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})
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});
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}
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export function decode(buf, customOpts) {
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var opts = Object.assign({}, defaultDecoderOpts, customOpts);
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var ast = decoder.decode(buf, opts);
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if (opts.ignoreCustomNameSection === false) {
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restoreFunctionNames(ast);
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restoreLocalNames(ast);
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restoreModuleName(ast);
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}
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return ast;
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}
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