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index.js
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Mon, Feb 10, 17:30

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

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