318 lines
10 KiB
JavaScript
318 lines
10 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.applyOperations = applyOperations;
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var _wasmGen = require("@webassemblyjs/wasm-gen");
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var _encoder = require("@webassemblyjs/wasm-gen/lib/encoder");
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var _ast = require("@webassemblyjs/ast");
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var _helperWasmSection = require("@webassemblyjs/helper-wasm-section");
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var _helperBuffer = require("@webassemblyjs/helper-buffer");
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var _helperWasmBytecode = require("@webassemblyjs/helper-wasm-bytecode");
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function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
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function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
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function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
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function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
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function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_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 _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
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function shiftLocNodeByDelta(node, delta) {
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(0, _ast.assertHasLoc)(node); // $FlowIgnore: assertHasLoc ensures that
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node.loc.start.column += delta; // $FlowIgnore: assertHasLoc ensures that
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node.loc.end.column += delta;
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}
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function applyUpdate(ast, uint8Buffer, _ref) {
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var _ref2 = _slicedToArray(_ref, 2),
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oldNode = _ref2[0],
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newNode = _ref2[1];
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var deltaElements = 0;
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(0, _ast.assertHasLoc)(oldNode);
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var sectionName = (0, _helperWasmBytecode.getSectionForNode)(newNode);
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var replacementByteArray = (0, _wasmGen.encodeNode)(newNode);
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/**
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* Replace new node as bytes
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*/
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uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
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oldNode.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
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oldNode.loc.end.column, replacementByteArray);
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/**
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* Update function body size if needed
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*/
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if (sectionName === "code") {
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// Find the parent func
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(0, _ast.traverse)(ast, {
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Func: function Func(_ref3) {
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var node = _ref3.node;
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var funcHasThisIntr = node.body.find(function (n) {
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return n === newNode;
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}) !== undefined; // Update func's body size if needed
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if (funcHasThisIntr === true) {
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// These are the old functions locations informations
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(0, _ast.assertHasLoc)(node);
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var oldNodeSize = (0, _wasmGen.encodeNode)(oldNode).length;
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var bodySizeDeltaBytes = replacementByteArray.length - oldNodeSize;
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if (bodySizeDeltaBytes !== 0) {
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var newValue = node.metadata.bodySize + bodySizeDeltaBytes;
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var newByteArray = (0, _encoder.encodeU32)(newValue); // function body size byte
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// FIXME(sven): only handles one byte u32
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var start = node.loc.start.column;
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var end = start + 1;
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uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newByteArray);
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}
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}
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}
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});
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}
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/**
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* Update section size
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*/
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var deltaBytes = replacementByteArray.length - (oldNode.loc.end.column - oldNode.loc.start.column); // Init location informations
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newNode.loc = {
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start: {
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line: -1,
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column: -1
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},
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end: {
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line: -1,
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column: -1
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}
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}; // Update new node end position
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// $FlowIgnore: assertHasLoc ensures that
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newNode.loc.start.column = oldNode.loc.start.column; // $FlowIgnore: assertHasLoc ensures that
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newNode.loc.end.column = // $FlowIgnore: assertHasLoc ensures that
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oldNode.loc.start.column + replacementByteArray.length;
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return {
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uint8Buffer: uint8Buffer,
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deltaBytes: deltaBytes,
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deltaElements: deltaElements
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};
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}
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function applyDelete(ast, uint8Buffer, node) {
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var deltaElements = -1; // since we removed an element
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(0, _ast.assertHasLoc)(node);
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var sectionName = (0, _helperWasmBytecode.getSectionForNode)(node);
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if (sectionName === "start") {
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var sectionMetadata = (0, _ast.getSectionMetadata)(ast, "start");
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/**
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* The start section only contains one element,
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* we need to remove the whole section
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*/
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uint8Buffer = (0, _helperWasmSection.removeSections)(ast, uint8Buffer, "start");
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var _deltaBytes = -(sectionMetadata.size.value + 1);
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/* section id */
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return {
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uint8Buffer: uint8Buffer,
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deltaBytes: _deltaBytes,
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deltaElements: deltaElements
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};
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} // replacement is nothing
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var replacement = [];
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uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
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node.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
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node.loc.end.column, replacement);
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/**
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* Update section
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*/
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// $FlowIgnore: assertHasLoc ensures that
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var deltaBytes = -(node.loc.end.column - node.loc.start.column);
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return {
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uint8Buffer: uint8Buffer,
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deltaBytes: deltaBytes,
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deltaElements: deltaElements
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};
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}
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function applyAdd(ast, uint8Buffer, node) {
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var deltaElements = +1; // since we added an element
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var sectionName = (0, _helperWasmBytecode.getSectionForNode)(node);
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var sectionMetadata = (0, _ast.getSectionMetadata)(ast, sectionName); // Section doesn't exists, we create an empty one
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if (typeof sectionMetadata === "undefined") {
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var res = (0, _helperWasmSection.createEmptySection)(ast, uint8Buffer, sectionName);
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uint8Buffer = res.uint8Buffer;
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sectionMetadata = res.sectionMetadata;
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}
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/**
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* check that the expressions were ended
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*/
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if ((0, _ast.isFunc)(node)) {
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// $FlowIgnore
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var body = node.body;
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if (body.length === 0 || body[body.length - 1].id !== "end") {
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throw new Error("expressions must be ended");
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}
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}
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if ((0, _ast.isGlobal)(node)) {
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// $FlowIgnore
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var body = node.init;
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if (body.length === 0 || body[body.length - 1].id !== "end") {
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throw new Error("expressions must be ended");
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}
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}
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/**
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* Add nodes
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*/
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var newByteArray = (0, _wasmGen.encodeNode)(node); // The size of the section doesn't include the storage of the size itself
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// we need to manually add it here
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var start = (0, _ast.getEndOfSection)(sectionMetadata);
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var end = start;
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/**
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* Update section
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*/
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var deltaBytes = newByteArray.length;
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uint8Buffer = (0, _helperBuffer.overrideBytesInBuffer)(uint8Buffer, start, end, newByteArray);
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node.loc = {
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start: {
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line: -1,
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column: start
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},
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end: {
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line: -1,
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column: start + deltaBytes
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}
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}; // for func add the additional metadata in the AST
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if (node.type === "Func") {
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// the size is the first byte
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// FIXME(sven): handle LEB128 correctly here
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var bodySize = newByteArray[0];
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node.metadata = {
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bodySize: bodySize
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};
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}
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if (node.type !== "IndexInFuncSection") {
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(0, _ast.orderedInsertNode)(ast.body[0], node);
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}
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return {
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uint8Buffer: uint8Buffer,
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deltaBytes: deltaBytes,
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deltaElements: deltaElements
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};
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}
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function applyOperations(ast, uint8Buffer, ops) {
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ops.forEach(function (op) {
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var state;
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var sectionName;
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switch (op.kind) {
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case "update":
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state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
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sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
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break;
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case "delete":
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state = applyDelete(ast, uint8Buffer, op.node);
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sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
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break;
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case "add":
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state = applyAdd(ast, uint8Buffer, op.node);
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sectionName = (0, _helperWasmBytecode.getSectionForNode)(op.node);
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break;
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default:
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throw new Error("Unknown operation");
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}
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/**
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* Resize section vec size.
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* If the length of the LEB-encoded size changes, this can change
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* the byte length of the section and the offset for nodes in the
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* section. So we do this first before resizing section byte size
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* or shifting following operations' nodes.
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*/
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if (state.deltaElements !== 0 && sectionName !== "start") {
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var oldBufferLength = state.uint8Buffer.length;
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state.uint8Buffer = (0, _helperWasmSection.resizeSectionVecSize)(ast, state.uint8Buffer, sectionName, state.deltaElements); // Infer bytes added/removed by comparing buffer lengths
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state.deltaBytes += state.uint8Buffer.length - oldBufferLength;
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}
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/**
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* Resize section byte size.
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* If the length of the LEB-encoded size changes, this can change
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* the offset for nodes in the section. So we do this before
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* shifting following operations' nodes.
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*/
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if (state.deltaBytes !== 0 && sectionName !== "start") {
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var _oldBufferLength = state.uint8Buffer.length;
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state.uint8Buffer = (0, _helperWasmSection.resizeSectionByteSize)(ast, state.uint8Buffer, sectionName, state.deltaBytes); // Infer bytes added/removed by comparing buffer lengths
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state.deltaBytes += state.uint8Buffer.length - _oldBufferLength;
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}
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/**
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* Shift following operation's nodes
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*/
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if (state.deltaBytes !== 0) {
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ops.forEach(function (op) {
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// We don't need to handle add ops, they are positioning independent
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switch (op.kind) {
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case "update":
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shiftLocNodeByDelta(op.oldNode, state.deltaBytes);
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break;
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case "delete":
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shiftLocNodeByDelta(op.node, state.deltaBytes);
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break;
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}
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});
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}
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uint8Buffer = state.uint8Buffer;
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});
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return uint8Buffer;
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}
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