Files
2026-04-08 13:55:13 +05:30

552 lines
20 KiB
TypeScript

import {
type NodePath,
traverse,
type Node,
type PluginObj, type PluginPass,
type types as t,
} from '@babel/core';
import type { PublicReplacements } from '@babel/template';
function __ts_cast__<T>(_value: unknown): asserts _value is T { }
function findParentStatementPath(path: NodePath): NodePath<t.Statement> | null {
while (path && !path.isStatement()) {
path = path.parentPath!;
}
return path;
}
function getEnclosingConditionalExpression(path: NodePath) {
while (path && !path.isStatement()) {
if (path.isConditionalExpression()) {
return path;
}
path = path.parentPath!;
}
return null;
}
type NeededNames = 'Completion' | 'AbruptCompletion' | 'Assert' | 'Call' | 'IteratorClose' | 'AsyncIteratorClose' | 'Value' | 'skipDebugger' | 'ask262Debug';
interface State extends PluginPass {
needed: Partial<Record<NeededNames, boolean>>;
fileRelativePath?: string;
}
interface Macro<R extends PublicReplacements = Record<string, Node | null>> {
template(sourceLocation: Node, replacements: Readonly<R>): t.Statement | t.Statement[];
readonly imports: readonly NeededNames[];
readonly allowAnyExpression?: boolean;
}
interface Macros {
[m: string]: Macro;
Q: Macro<{ value: t.Identifier, checkYieldStar: t.Statement | null }>;
X: Macro<{ value: t.Identifier, checkYieldStar: t.Statement | null, source: t.StringLiteral }>;
ReturnIfAbrupt: Macro<{ value: t.Identifier, checkYieldStar: t.Statement | null }>;
IfAbruptCloseIterator: Macro<{ value: t.Identifier, iteratorRecord: t.Identifier }>;
IfAbruptCloseAsyncIterator: Macro<{ value: t.Identifier, iteratorRecord: t.Identifier }>;
IfAbruptRejectPromise: Macro<{ value: t.Identifier, capability: t.Identifier }>;
}
export default ({ types: t, template }: typeof import('@babel/core')): PluginObj<State> => {
const parseOptions = { preserveComments: true };
function createImportCompletion() {
return template.ast(`
import { Completion } from "#self";
`);
}
function createImportSkipDebugger() {
return template.ast(`
import { skipDebugger } from "#self";
`);
}
function createImportAbruptCompletion() {
return template.ast(`
import { AbruptCompletion } from "#self";
`);
}
function createImportAssert() {
return template.ast(`
import { Assert } from "#self";
`);
}
function createImportCall() {
return template.ast(`
import { Call } from "#self";
`);
}
function createImportIteratorClose() {
return template.statement.ast`
import { IteratorClose } from "#self";
`;
}
function createImportAsyncIteratorClose() {
return template.statement.ast`
import { AsyncIteratorClose } from "#self";
`;
}
function createImportValue() {
return template.ast(`
import { Value } from "#self";
`);
}
function createImportAsk262Debug() {
return template.ast(`
import { ask262Debug } from "#self";
`);
}
function addSectionFromComments(
path: NodePath<t.FunctionDeclaration> | NodePath<t.VariableDeclaration> | NodePath<t.ExportNamedDeclaration> | NodePath<t.ClassMethod> | NodePath<t.ObjectMethod>,
state: State,
getName: () => string,
getBody: () => t.BlockStatement | null,
insertSection: boolean,
) {
if (!path.node.leadingComments) return;
const sectionIds: string[] = [];
let url = '';
let firstComment: t.Comment | null = null;
for (const c of path.node.leadingComments) {
for (const line of c.value.split('\n')) {
const matches = line.match(/#(sec-[a-zA-Z0-9._%-]+)/g);
if (matches) {
sectionIds.push(...matches.map((m) => m.substring(1)));
if (!firstComment) {
firstComment = c;
}
if (!url) {
const section = line.split(' ').find((l) => l.includes('#sec'));
// Only capture external URLs (skip local/fragment references)
if (section?.startsWith('https://')) {
url = section;
}
}
}
}
}
if (sectionIds.length === 0) return;
const name = getName();
// 1. Keep existing .section (backward compat) - uses first URL
// Only applies when caller explicitly allows it
if (name && url && firstComment && insertSection) {
const result = path.insertAfter(withSource(firstComment, template.ast(`${name}.section = '${url}';`)));
if (path.node.trailingComments) {
result[result.length - 1].node.trailingComments = path.node.trailingComments;
path.node.trailingComments = null;
}
}
// 2. Get function body via callback (node-type check done by caller)
const body = getBody();
// 3. Inject mark() at start of function body (only for block bodies)
if (body?.type === 'BlockStatement') {
const line = path.node.loc?.start.line ?? 0;
const sectionIdsStr = JSON.stringify(sectionIds);
const filePathStr = JSON.stringify(state.fileRelativePath);
const markCall = template.statement(
`ask262Debug.mark(${sectionIdsStr}, ${filePathStr}, ${line});`,
)();
body.body.unshift(markCall);
state.needed.ask262Debug = true;
}
}
const maybeSkipDebugger = (value: t.Identifier, callee: Node) => withSource(callee, template.statement(`
/* node:coverage ignore next */ if (%%value%% && typeof %%value%% === 'object' && 'next' in %%value%%) %%value%% = skipDebugger(%%value%%);
`, { preserveComments: true })({ value }))[0];
type NodeWithLocation = Pick<Node, 'start' | 'end' | 'loc'>;
function setSource(source: NodeWithLocation, n: t.Node) {
if (n.loc) {
return;
}
n.start = source.start;
n.end = source.end;
n.loc = source.loc;
n.leadingComments?.forEach((comment) => {
comment.start = source.start || undefined;
comment.end = source.end || undefined;
comment.loc = source.loc || undefined;
});
}
function withSource(source: NodeWithLocation, node: t.Statement | t.Statement[]): t.Statement[] {
if (!Array.isArray(node)) {
node = [node];
}
for (const n of node) {
setSource(source, n);
traverse(n, {
noScope: true,
enter(path) {
setSource(source, path.node);
},
});
}
return node;
}
const MACROS: Macros = {
Q: {
template: (source, code) => withSource(source, template(`
/* ReturnIfAbrupt */
%%checkYieldStar%%
/* node:coverage ignore next */ if (%%value%% instanceof AbruptCompletion) return %%value%%;
/* node:coverage ignore next */ if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
`, parseOptions)(code)),
imports: ['AbruptCompletion', 'Completion', 'Assert'],
allowAnyExpression: true,
},
X: {
template: (source, code) => withSource(source, template(`
/* X */
%%checkYieldStar%%
/* node:coverage ignore next */ if (%%value%% instanceof AbruptCompletion) throw new Assert.Error(%%source%%, { cause: %%value%% });
/* node:coverage ignore next */ if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
`, parseOptions)(code)),
imports: ['Assert', 'Completion', 'AbruptCompletion', 'skipDebugger'],
allowAnyExpression: true,
},
IfAbruptCloseIterator: {
template: (source, code) => withSource(source, template(`
/* IfAbruptCloseIterator */
/* node:coverage ignore next */
if (%%value%% instanceof AbruptCompletion) return skipDebugger(IteratorClose(%%iteratorRecord%%, %%value%%));
/* node:coverage ignore next */
if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
`, parseOptions)(code)),
imports: ['IteratorClose', 'AbruptCompletion', 'Completion', 'skipDebugger'],
},
IfAbruptCloseAsyncIterator: {
template: (source, code) => withSource(source, template(`
/* IfAbruptCloseAsyncIterator */
/* node:coverage ignore next */
if (%%value%% instanceof AbruptCompletion) return yield* AsyncIteratorClose(%%iteratorRecord%%, %%value%%);
/* node:coverage ignore next */
if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
`, parseOptions)(code)),
imports: ['Assert', 'AsyncIteratorClose', 'AbruptCompletion', 'Completion', 'skipDebugger'],
},
IfAbruptRejectPromise: {
template: (source, code) => withSource(source, template(`
/* IfAbruptRejectPromise */
/* node:coverage disable */
if (%%value%% instanceof AbruptCompletion) {
const callRejectCompletion = skipDebugger(Call(%%capability%%.Reject, Value.undefined, [%%value%%.Value]));
if (callRejectCompletion instanceof AbruptCompletion) return callRejectCompletion;
return %%capability%%.Promise;
}
if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
/* node:coverage enable */
`, parseOptions)(code)),
imports: ['Call', 'Value', 'AbruptCompletion', 'Completion', 'skipDebugger'],
},
ReturnIfAbrupt: null!,
};
__ts_cast__<Macros>(MACROS);
MACROS.ReturnIfAbrupt = MACROS.Q;
const MACRO_NAMES = Object.keys(MACROS);
// For frequently used Record-like classes, inline them to get a better debug experience.
const Completions = {
NormalCompletion: (source: Node, code: PublicReplacements) => withSource(source, template('({ __proto__: NormalCompletion.prototype, Value: %%value%% })', parseOptions)(code))[0],
ThrowCompletion: (source: Node, code: PublicReplacements) => withSource(source, template('({ __proto__: ThrowCompletion.prototype, Value: %%value%% })', parseOptions)(code))[0],
};
const Structs = [
'AsyncGeneratorRequestRecord',
'ClassElementDefinitionRecord',
'ClassFieldDefinitionRecord',
'ClassStaticBlockDefinitionRecord',
'PrivateElementRecord',
];
function tryRemove(path: NodePath<t.CallExpression>) {
try {
path.remove();
} catch (e) {
throw path.get('arguments.0').buildCodeFrameError(`Macros error: ${(e as Error).message}`);
}
}
return {
visitor: {
Program: {
enter(path, state) {
state.needed = {};
// Capture relative file path from state.filename (relative to src/)
const absolutePath = state.filename || '';
state.fileRelativePath = absolutePath.replace(/.*\/src\//, '') || 'unknown.mts';
},
exit(path, state) {
if (state.needed.skipDebugger) {
path.unshiftContainer('body', createImportSkipDebugger());
}
if (state.needed.Completion) {
path.unshiftContainer('body', createImportCompletion());
}
if (state.needed.AbruptCompletion) {
path.unshiftContainer('body', createImportAbruptCompletion());
}
if (state.needed.Assert) {
path.unshiftContainer('body', createImportAssert());
}
if (state.needed.Call) {
path.unshiftContainer('body', createImportCall());
}
if (state.needed.IteratorClose) {
path.unshiftContainer('body', createImportIteratorClose());
}
if (state.needed.AsyncIteratorClose) {
path.unshiftContainer('body', createImportAsyncIteratorClose());
}
if (state.needed.Value) {
path.unshiftContainer('body', createImportValue());
}
if (state.needed.ask262Debug) {
path.unshiftContainer('body', createImportAsk262Debug());
}
},
},
CallExpression(path, state) {
const callee = path.node.callee;
if (!t.isIdentifier(callee)) {
return;
}
if (callee.name && callee.name in Completions) {
const template = Completions[callee.name as keyof typeof Completions];
path.replaceWith(template(callee, { value: path.node.arguments[0] }));
return;
}
if (Structs.includes(callee.name) && path.node.arguments.length === 1) {
const arg0 = path.node.arguments[0];
if (t.isObjectExpression(arg0)) {
path.replaceWith(t.objectExpression([
t.objectProperty(t.identifier('__proto__'), t.memberExpression(t.identifier(callee.name), t.identifier('prototype'))),
...arg0.properties,
]));
return;
}
}
const macroName = callee.name;
if (MACRO_NAMES.includes(macroName)) {
const enclosingConditional = getEnclosingConditionalExpression(path);
if (enclosingConditional !== null) {
if (enclosingConditional.parentPath.isVariableDeclarator()) {
const declaration = enclosingConditional.parentPath.parentPath;
const id = enclosingConditional.parentPath.get('id');
declaration.replaceWithMultiple(template.ast(`
let ${id};
if (${enclosingConditional.get('test')}) {
${id} = ${enclosingConditional.get('consequent')}
} else {
${id} = ${enclosingConditional.get('alternate')}
}
`));
return;
} else {
throw path.buildCodeFrameError('Macros may not be used within conditional expressions');
}
}
const macro = MACROS[macroName];
const [argument] = path.node.arguments;
if (macro === MACROS.Q && (path.parentPath.isReturnStatement() || path.parentPath.isArrowFunctionExpression())) {
path.replaceWith(path.node.arguments[0]);
return;
}
if (path.parentPath.isArrowFunctionExpression()) {
throw path.buildCodeFrameError('Macros may not be the sole expression of an arrow function');
}
const statementPath = findParentStatementPath(path);
if (!statementPath) {
throw path.buildCodeFrameError('Internal error: no parent statement found');
}
macro.imports.forEach((i) => {
state.needed[i] = path.scope.getBinding(i) === undefined;
});
if (macro === MACROS.Q && t.isIdentifier(argument)) {
const binding = path.scope.getBinding(argument.name)!;
(binding.path.parent as t.VariableDeclaration).kind = 'let';
statementPath.insertBefore(withSource(callee, template(`
/* ReturnIfAbrupt */
/* node:coverage ignore next */ if (%%value%% && typeof %%value%% === 'object' && 'next' in %%value%%) throw new Assert.Error('Forgot to yield* on the completion.');
/* node:coverage ignore next */ if (%%value%% instanceof AbruptCompletion) return %%value%%;
/* node:coverage ignore next */ if (%%value%% instanceof Completion) %%value%% = %%value%%.Value;
`, parseOptions)({ value: argument })));
path.replaceWith(argument);
} else {
if (macro === MACROS.IfAbruptRejectPromise) {
const [, capability] = path.node.arguments;
if (!t.isIdentifier(argument)) {
throw path.get('arguments.0').buildCodeFrameError('First argument to IfAbruptRejectPromise should be an identifier');
}
if (!t.isIdentifier(capability)) {
throw path.get('arguments.1').buildCodeFrameError('Second argument to IfAbruptRejectPromise should be an identifier');
}
const binding = path.scope.getBinding(argument.name)!;
(binding.path.parent as t.VariableDeclaration).kind = 'let';
statementPath.insertBefore(macro.template(callee, { value: argument, capability }));
tryRemove(path);
} else if (macro === MACROS.IfAbruptCloseIterator || macro === MACROS.IfAbruptCloseAsyncIterator) {
if (!t.isIdentifier(argument)) {
throw path.get('arguments.0').buildCodeFrameError('First argument to IfAbruptCloseIterator should be an identifier');
}
const iteratorRecord = path.get('arguments.1');
if (!iteratorRecord.isIdentifier()) {
throw iteratorRecord.buildCodeFrameError('Second argument to IfAbruptCloseIterator should be an identifier');
}
const binding = path.scope.getBinding(argument.name)!;
(binding.path.parent as t.VariableDeclaration).kind = 'let';
statementPath.insertBefore(
macro.template(callee, {
value: argument,
iteratorRecord: iteratorRecord.node,
}),
);
tryRemove(path);
} else {
let id;
if (!macro.allowAnyExpression) {
if (!t.isIdentifier(argument)) {
throw path.get('arguments.0').buildCodeFrameError(`First argument to ${macroName} should be an identifier`);
}
id = argument;
} else {
id = statementPath.scope.generateUidIdentifier();
statementPath.insertBefore(withSource(callee, template(`
/* ${macroName !== 'Q' ? macroName : 'ReturnIfAbrupt'} */
let %%id%% = %%argument%%;
`, parseOptions)({ id, argument })));
}
const replacement: { value: typeof id, checkYieldStar: t.Statement | null, source?: t.StringLiteral } = {
checkYieldStar: null,
value: id,
};
if (macro === MACROS.X) {
replacement.source = t.stringLiteral(`! ${path.get('arguments.0').getSource()} returned an abrupt completion`);
if (!t.isYieldExpression(argument, { delegate: true })) {
replacement.checkYieldStar = maybeSkipDebugger(id, callee);
}
}
statementPath.insertBefore(macro.template(callee, replacement));
path.replaceWith(id);
}
}
} else if (macroName === 'Assert') {
if (!path.node.arguments[1]) {
path.node.arguments.push(t.stringLiteral(path.get('arguments.0').getSource()));
}
}
},
ThrowStatement(path) {
const arg = path.get('argument');
if (arg.isNewExpression()) {
const callee = arg.get('callee');
if (callee.isIdentifier() && callee.node.name === 'OutOfRange') {
path.addComment('leading', ' node:coverage ignore next ', false);
const { parentPath } = path;
if (parentPath.isSwitchCase() && parentPath.node.consequent[0] === path.node) {
parentPath.addComment('leading', ' node:coverage ignore next ', false);
}
}
}
},
FunctionDeclaration(path, state) {
addSectionFromComments(
path,
state,
() => path.node.id!.name,
() => path.node.body,
true,
);
},
VariableDeclaration(path, state) {
const init = path.get('declarations.0.init');
if (init.isFunctionExpression()) {
const id = path.node.declarations[0].id as t.Identifier;
addSectionFromComments(
path,
state,
() => id.name,
() => init.node.body,
true,
);
} else if (init.isArrowFunctionExpression()) {
const id = path.node.declarations[0].id as t.Identifier;
addSectionFromComments(
path,
state,
() => id.name,
() => (init.node.body.type === 'BlockStatement' ? init.node.body : null),
true,
);
}
},
ExportNamedDeclaration(path, state) {
const declaration = path.node.declaration;
if (declaration?.type === 'FunctionDeclaration') {
addSectionFromComments(
path,
state,
() => declaration.id!.name,
() => declaration.body,
true,
);
}
},
ClassMethod(path, state) {
const key = path.node.key;
if (key.type === 'Identifier') {
addSectionFromComments(
path,
state,
() => key.name,
() => path.node.body,
false,
);
}
},
ObjectMethod(path, state) {
const key = path.node.key;
if (key.type === 'Identifier') {
addSectionFromComments(
path,
state,
() => key.name,
() => path.node.body,
false,
);
}
},
},
};
};