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299 lines
9.1 KiB
299 lines
9.1 KiB
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 { encodeNode } from "@webassemblyjs/wasm-gen";
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import { encodeU32 } from "@webassemblyjs/wasm-gen/lib/encoder";
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import { isFunc, isGlobal, assertHasLoc, orderedInsertNode, getSectionMetadata, traverse, getEndOfSection } from "@webassemblyjs/ast";
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import { resizeSectionByteSize, resizeSectionVecSize, createEmptySection, removeSections } from "@webassemblyjs/helper-wasm-section";
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import { overrideBytesInBuffer } from "@webassemblyjs/helper-buffer";
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import { getSectionForNode } from "@webassemblyjs/helper-wasm-bytecode";
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function shiftLocNodeByDelta(node, delta) {
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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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assertHasLoc(oldNode);
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var sectionName = getSectionForNode(newNode);
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var replacementByteArray = encodeNode(newNode);
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/**
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* Replace new node as bytes
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*/
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uint8Buffer = 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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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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assertHasLoc(node);
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var oldNodeSize = 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 = 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 = 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 - ( // $FlowIgnore: assertHasLoc ensures that
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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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assertHasLoc(node);
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var sectionName = getSectionForNode(node);
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if (sectionName === "start") {
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var sectionMetadata = 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 = removeSections(ast, uint8Buffer, "start");
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var _deltaBytes = -(sectionMetadata.size.value + 1)
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/* section id */
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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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} // replacement is nothing
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var replacement = [];
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uint8Buffer = 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 = getSectionForNode(node);
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var sectionMetadata = 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 = 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 (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 (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 = 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 = 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 = 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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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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export 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 = 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 = 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 = 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 = 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 = 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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