| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | */ |
| 7 | |
| 8 | import {NodePath, Scope} from '@babel/traverse'; |
| 9 | import * as t from '@babel/types'; |
| 10 | import invariant from 'invariant'; |
| 11 | import { |
| 12 | CompilerDiagnostic, |
| 13 | CompilerError, |
| 14 | CompilerErrorDetail, |
| 15 | CompilerSuggestionOperation, |
| 16 | ErrorCategory, |
| 17 | } from '../CompilerError'; |
| 18 | import {assertExhaustive, hasNode} from '../Utils/utils'; |
| 19 | import {Environment} from './Environment'; |
| 20 | import { |
| 21 | ArrayExpression, |
| 22 | ArrayPattern, |
| 23 | BlockId, |
| 24 | BranchTerminal, |
| 25 | BuiltinTag, |
| 26 | Case, |
| 27 | Effect, |
| 28 | GeneratedSource, |
| 29 | GotoVariant, |
| 30 | HIRFunction, |
| 31 | IfTerminal, |
| 32 | InstructionKind, |
| 33 | InstructionValue, |
| 34 | JsxAttribute, |
| 35 | LoweredFunction, |
| 36 | ObjectPattern, |
| 37 | ObjectProperty, |
| 38 | ObjectPropertyKey, |
| 39 | Place, |
| 40 | PropertyLiteral, |
| 41 | ReturnTerminal, |
| 42 | SourceLocation, |
| 43 | SpreadPattern, |
| 44 | ThrowTerminal, |
| 45 | Type, |
| 46 | makeInstructionId, |
| 47 | makePropertyLiteral, |
| 48 | makeType, |
| 49 | promoteTemporary, |
| 50 | validateIdentifierName, |
| 51 | } from './HIR'; |
| 52 | import HIRBuilder, {Bindings, createTemporaryPlace} from './HIRBuilder'; |
| 53 | import {BuiltInArrayId} from './ObjectShape'; |
| 54 | |
| 55 | /* |
| 56 | * ******************************************************************************************* |
| 57 | * ******************************************************************************************* |
| 58 | * ************************************* Lowering to HIR ************************************* |
| 59 | * ******************************************************************************************* |
| 60 | * ******************************************************************************************* |
| 61 | */ |
| 62 | |
| 63 | /* |
| 64 | * Converts a function into a high-level intermediate form (HIR) which represents |
| 65 | * the code as a control-flow graph. All normal control-flow is modeled as accurately |
| 66 | * as possible to allow precise, expression-level memoization. The main exceptions are |
| 67 | * try/catch statements and exceptions: we currently bail out (skip compilation) for |
| 68 | * try/catch and do not attempt to model control flow of exceptions, which can occur |
| 69 | * ~anywhere in JavaScript. The compiler assumes that exceptions will be handled by |
| 70 | * the runtime, ie by invalidating memoization. |
| 71 | */ |
| 72 | export function lower( |
| 73 | func: NodePath<t.Function>, |
| 74 | env: Environment, |
| 75 | // Bindings captured from the outer function, in case lower() is called recursively (for lambdas) |
| 76 | bindings: Bindings | null = null, |
| 77 | capturedRefs: Map<t.Identifier, SourceLocation> = new Map(), |
| 78 | ): HIRFunction { |
| 79 | const builder = new HIRBuilder(env, { |
| 80 | bindings, |
| 81 | context: capturedRefs, |
| 82 | }); |
| 83 | const context: HIRFunction['context'] = []; |
| 84 | |
| 85 | for (const [ref, loc] of capturedRefs ?? []) { |
| 86 | context.push({ |
| 87 | kind: 'Identifier', |
| 88 | identifier: builder.resolveBinding(ref), |
| 89 | effect: Effect.Unknown, |
| 90 | reactive: false, |
| 91 | loc, |
| 92 | }); |
| 93 | } |
| 94 | |
| 95 | let id: string | null = null; |
| 96 | if (func.isFunctionDeclaration() || func.isFunctionExpression()) { |
| 97 | const idNode = ( |
| 98 | func as NodePath<t.FunctionDeclaration | t.FunctionExpression> |
| 99 | ).get('id'); |
| 100 | if (hasNode(idNode)) { |
| 101 | id = idNode.node.name; |
| 102 | } |
| 103 | } |
| 104 | const params: Array<Place | SpreadPattern> = []; |
| 105 | func.get('params').forEach(param => { |
| 106 | if (param.isIdentifier()) { |
| 107 | const binding = builder.resolveIdentifier(param); |
| 108 | if (binding.kind !== 'Identifier') { |
| 109 | builder.recordError( |
| 110 | CompilerDiagnostic.create({ |
| 111 | category: ErrorCategory.Invariant, |
| 112 | reason: 'Could not find binding', |
| 113 | description: `[BuildHIR] Could not find binding for param \`${param.node.name}\``, |
| 114 | }).withDetails({ |
| 115 | kind: 'error', |
| 116 | loc: param.node.loc ?? null, |
| 117 | message: 'Could not find binding', |
| 118 | }), |
| 119 | ); |
| 120 | return; |
| 121 | } |
| 122 | const place: Place = { |
| 123 | kind: 'Identifier', |
| 124 | identifier: binding.identifier, |
| 125 | effect: Effect.Unknown, |
| 126 | reactive: false, |
| 127 | loc: param.node.loc ?? GeneratedSource, |
| 128 | }; |
| 129 | params.push(place); |
| 130 | } else if ( |
| 131 | param.isObjectPattern() || |
| 132 | param.isArrayPattern() || |
| 133 | param.isAssignmentPattern() |
| 134 | ) { |
| 135 | const place: Place = { |
| 136 | kind: 'Identifier', |
| 137 | identifier: builder.makeTemporary(param.node.loc ?? GeneratedSource), |
| 138 | effect: Effect.Unknown, |
| 139 | reactive: false, |
| 140 | loc: param.node.loc ?? GeneratedSource, |
| 141 | }; |
| 142 | promoteTemporary(place.identifier); |
| 143 | params.push(place); |
| 144 | lowerAssignment( |
| 145 | builder, |
| 146 | param.node.loc ?? GeneratedSource, |
| 147 | InstructionKind.Let, |
| 148 | param, |
| 149 | place, |
| 150 | 'Assignment', |
| 151 | ); |
| 152 | } else if (param.isRestElement()) { |
| 153 | const place: Place = { |
| 154 | kind: 'Identifier', |
| 155 | identifier: builder.makeTemporary(param.node.loc ?? GeneratedSource), |
| 156 | effect: Effect.Unknown, |
| 157 | reactive: false, |
| 158 | loc: param.node.loc ?? GeneratedSource, |
| 159 | }; |
| 160 | params.push({ |
| 161 | kind: 'Spread', |
| 162 | place, |
| 163 | }); |
| 164 | lowerAssignment( |
| 165 | builder, |
| 166 | param.node.loc ?? GeneratedSource, |
| 167 | InstructionKind.Let, |
| 168 | param.get('argument'), |
| 169 | place, |
| 170 | 'Assignment', |
| 171 | ); |
| 172 | } else { |
| 173 | builder.recordError( |
| 174 | CompilerDiagnostic.create({ |
| 175 | category: ErrorCategory.Todo, |
| 176 | reason: `Handle ${param.node.type} parameters`, |
| 177 | description: `[BuildHIR] Add support for ${param.node.type} parameters`, |
| 178 | }).withDetails({ |
| 179 | kind: 'error', |
| 180 | loc: param.node.loc ?? null, |
| 181 | message: 'Unsupported parameter type', |
| 182 | }), |
| 183 | ); |
| 184 | } |
| 185 | }); |
| 186 | |
| 187 | let directives: Array<string> = []; |
| 188 | const body = func.get('body'); |
| 189 | if (body.isExpression()) { |
| 190 | const fallthrough = builder.reserve('block'); |
| 191 | const terminal: ReturnTerminal = { |
| 192 | kind: 'return', |
| 193 | returnVariant: 'Implicit', |
| 194 | loc: GeneratedSource, |
| 195 | value: lowerExpressionToTemporary(builder, body), |
| 196 | id: makeInstructionId(0), |
| 197 | effects: null, |
| 198 | }; |
| 199 | builder.terminateWithContinuation(terminal, fallthrough); |
| 200 | } else if (body.isBlockStatement()) { |
| 201 | lowerStatement(builder, body); |
| 202 | directives = body.get('directives').map(d => d.node.value.value); |
| 203 | } else { |
| 204 | builder.recordError( |
| 205 | CompilerDiagnostic.create({ |
| 206 | category: ErrorCategory.Syntax, |
| 207 | reason: `Unexpected function body kind`, |
| 208 | description: `Expected function body to be an expression or a block statement, got \`${body.type}\``, |
| 209 | }).withDetails({ |
| 210 | kind: 'error', |
| 211 | loc: body.node.loc ?? null, |
| 212 | message: 'Expected a block statement or expression', |
| 213 | }), |
| 214 | ); |
| 215 | } |
| 216 | |
| 217 | let validatedId: HIRFunction['id'] = null; |
| 218 | if (id != null) { |
| 219 | const idResult = validateIdentifierName(id); |
| 220 | if (idResult.isErr()) { |
| 221 | for (const detail of idResult.unwrapErr().details) { |
| 222 | builder.recordError(detail); |
| 223 | } |
| 224 | } else { |
| 225 | validatedId = idResult.unwrap().value; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | builder.terminate( |
| 230 | { |
| 231 | kind: 'return', |
| 232 | returnVariant: 'Void', |
| 233 | loc: GeneratedSource, |
| 234 | value: lowerValueToTemporary(builder, { |
| 235 | kind: 'Primitive', |
| 236 | value: undefined, |
| 237 | loc: GeneratedSource, |
| 238 | }), |
| 239 | id: makeInstructionId(0), |
| 240 | effects: null, |
| 241 | }, |
| 242 | null, |
| 243 | ); |
| 244 | |
| 245 | const hirBody = builder.build(); |
| 246 | |
| 247 | return { |
| 248 | id: validatedId, |
| 249 | nameHint: null, |
| 250 | params, |
| 251 | fnType: bindings == null ? env.fnType : 'Other', |
| 252 | returnTypeAnnotation: null, // TODO: extract the actual return type node if present |
| 253 | returns: createTemporaryPlace(env, func.node.loc ?? GeneratedSource), |
| 254 | body: hirBody, |
| 255 | context, |
| 256 | generator: func.node.generator === true, |
| 257 | async: func.node.async === true, |
| 258 | loc: func.node.loc ?? GeneratedSource, |
| 259 | env, |
| 260 | aliasingEffects: null, |
| 261 | directives, |
| 262 | }; |
| 263 | } |
| 264 | |
| 265 | // Helper to lower a statement |
| 266 | function lowerStatement( |
| 267 | builder: HIRBuilder, |
| 268 | stmtPath: NodePath<t.Statement>, |
| 269 | label: string | null = null, |
| 270 | ): void { |
| 271 | const stmtNode = stmtPath.node; |
| 272 | switch (stmtNode.type) { |
| 273 | case 'ThrowStatement': { |
| 274 | const stmt = stmtPath as NodePath<t.ThrowStatement>; |
| 275 | const value = lowerExpressionToTemporary(builder, stmt.get('argument')); |
| 276 | const handler = builder.resolveThrowHandler(); |
| 277 | if (handler != null) { |
| 278 | /* |
| 279 | * NOTE: we could support this, but a `throw` inside try/catch is using exceptions |
| 280 | * for control-flow and is generally considered an anti-pattern. we can likely |
| 281 | * just not support this pattern, unless it really becomes necessary for some reason. |
| 282 | */ |
| 283 | builder.recordError( |
| 284 | new CompilerErrorDetail({ |
| 285 | reason: |
| 286 | '(BuildHIR::lowerStatement) Support ThrowStatement inside of try/catch', |
| 287 | category: ErrorCategory.Todo, |
| 288 | loc: stmt.node.loc ?? null, |
| 289 | suggestions: null, |
| 290 | }), |
| 291 | ); |
| 292 | } |
| 293 | const terminal: ThrowTerminal = { |
| 294 | kind: 'throw', |
| 295 | value, |
| 296 | id: makeInstructionId(0), |
| 297 | loc: stmt.node.loc ?? GeneratedSource, |
| 298 | }; |
| 299 | builder.terminate(terminal, 'block'); |
| 300 | return; |
| 301 | } |
| 302 | case 'ReturnStatement': { |
| 303 | const stmt = stmtPath as NodePath<t.ReturnStatement>; |
| 304 | const argument = stmt.get('argument'); |
| 305 | let value; |
| 306 | if (argument.node === null) { |
| 307 | value = lowerValueToTemporary(builder, { |
| 308 | kind: 'Primitive', |
| 309 | value: undefined, |
| 310 | loc: GeneratedSource, |
| 311 | }); |
| 312 | } else { |
| 313 | value = lowerExpressionToTemporary( |
| 314 | builder, |
| 315 | argument as NodePath<t.Expression>, |
| 316 | ); |
| 317 | } |
| 318 | const terminal: ReturnTerminal = { |
| 319 | kind: 'return', |
| 320 | returnVariant: 'Explicit', |
| 321 | loc: stmt.node.loc ?? GeneratedSource, |
| 322 | value, |
| 323 | id: makeInstructionId(0), |
| 324 | effects: null, |
| 325 | }; |
| 326 | builder.terminate(terminal, 'block'); |
| 327 | return; |
| 328 | } |
| 329 | case 'IfStatement': { |
| 330 | const stmt = stmtPath as NodePath<t.IfStatement>; |
| 331 | // Block for code following the if |
| 332 | const continuationBlock = builder.reserve('block'); |
| 333 | // Block for the consequent (if the test is truthy) |
| 334 | const consequentBlock = builder.enter('block', _blockId => { |
| 335 | const consequent = stmt.get('consequent'); |
| 336 | lowerStatement(builder, consequent); |
| 337 | return { |
| 338 | kind: 'goto', |
| 339 | block: continuationBlock.id, |
| 340 | variant: GotoVariant.Break, |
| 341 | id: makeInstructionId(0), |
| 342 | loc: consequent.node.loc ?? GeneratedSource, |
| 343 | }; |
| 344 | }); |
| 345 | // Block for the alternate (if the test is not truthy) |
| 346 | let alternateBlock: BlockId; |
| 347 | const alternate = stmt.get('alternate'); |
| 348 | if (hasNode(alternate)) { |
| 349 | alternateBlock = builder.enter('block', _blockId => { |
| 350 | lowerStatement(builder, alternate); |
| 351 | return { |
| 352 | kind: 'goto', |
| 353 | block: continuationBlock.id, |
| 354 | variant: GotoVariant.Break, |
| 355 | id: makeInstructionId(0), |
| 356 | loc: alternate.node?.loc ?? GeneratedSource, |
| 357 | }; |
| 358 | }); |
| 359 | } else { |
| 360 | // If there is no else clause, use the continuation directly |
| 361 | alternateBlock = continuationBlock.id; |
| 362 | } |
| 363 | const test = lowerExpressionToTemporary(builder, stmt.get('test')); |
| 364 | const terminal: IfTerminal = { |
| 365 | kind: 'if', |
| 366 | test, |
| 367 | consequent: consequentBlock, |
| 368 | alternate: alternateBlock, |
| 369 | fallthrough: continuationBlock.id, |
| 370 | id: makeInstructionId(0), |
| 371 | loc: stmt.node.loc ?? GeneratedSource, |
| 372 | }; |
| 373 | builder.terminateWithContinuation(terminal, continuationBlock); |
| 374 | return; |
| 375 | } |
| 376 | case 'BlockStatement': { |
| 377 | const stmt = stmtPath as NodePath<t.BlockStatement>; |
| 378 | const statements = stmt.get('body'); |
| 379 | /** |
| 380 | * Hoistable identifier bindings defined for this precise block |
| 381 | * scope (excluding bindings from parent or child block scopes). |
| 382 | */ |
| 383 | const hoistableIdentifiers: Set<t.Identifier> = new Set(); |
| 384 | |
| 385 | for (const [, binding] of Object.entries(stmt.scope.bindings)) { |
| 386 | // refs to params are always valid / never need to be hoisted |
| 387 | if (binding.kind !== 'param') { |
| 388 | hoistableIdentifiers.add(binding.identifier); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | for (const s of statements) { |
| 393 | const willHoist = new Set<NodePath<t.Identifier>>(); |
| 394 | /* |
| 395 | * If we see a hoistable identifier before its declaration, it should be hoisted just |
| 396 | * before the statement that references it. |
| 397 | */ |
| 398 | let fnDepth = s.isFunctionDeclaration() ? 1 : 0; |
| 399 | const withFunctionContext = { |
| 400 | enter: (): void => { |
| 401 | fnDepth++; |
| 402 | }, |
| 403 | exit: (): void => { |
| 404 | fnDepth--; |
| 405 | }, |
| 406 | }; |
| 407 | s.traverse({ |
| 408 | FunctionExpression: withFunctionContext, |
| 409 | FunctionDeclaration: withFunctionContext, |
| 410 | ArrowFunctionExpression: withFunctionContext, |
| 411 | ObjectMethod: withFunctionContext, |
| 412 | Identifier(id: NodePath<t.Identifier>) { |
| 413 | const id2 = id; |
| 414 | if ( |
| 415 | !id2.isReferencedIdentifier() && |
| 416 | // isReferencedIdentifier is broken and returns false for reassignments |
| 417 | id.parent.type !== 'AssignmentExpression' |
| 418 | ) { |
| 419 | return; |
| 420 | } |
| 421 | const binding = id.scope.getBinding(id.node.name); |
| 422 | /** |
| 423 | * We can only hoist an identifier decl if |
| 424 | * 1. the reference occurs within an inner function |
| 425 | * or |
| 426 | * 2. the declaration itself is hoistable |
| 427 | */ |
| 428 | if ( |
| 429 | binding != null && |
| 430 | hoistableIdentifiers.has(binding.identifier) && |
| 431 | (fnDepth > 0 || binding.kind === 'hoisted') |
| 432 | ) { |
| 433 | willHoist.add(id); |
| 434 | } |
| 435 | }, |
| 436 | }); |
| 437 | /* |
| 438 | * After visiting the declaration, hoisting is no longer required |
| 439 | */ |
| 440 | s.traverse({ |
| 441 | Identifier(path: NodePath<t.Identifier>) { |
| 442 | if (hoistableIdentifiers.has(path.node)) { |
| 443 | hoistableIdentifiers.delete(path.node); |
| 444 | } |
| 445 | }, |
| 446 | }); |
| 447 | |
| 448 | // Hoist declarations that need it to the earliest point where they are needed |
| 449 | for (const id of willHoist) { |
| 450 | const binding = stmt.scope.getBinding(id.node.name); |
| 451 | CompilerError.invariant(binding != null, { |
| 452 | reason: 'Expected to find binding for hoisted identifier', |
| 453 | description: `Could not find a binding for ${id.node.name}`, |
| 454 | loc: id.node.loc ?? GeneratedSource, |
| 455 | }); |
| 456 | if (builder.environment.isHoistedIdentifier(binding.identifier)) { |
| 457 | // Already hoisted |
| 458 | continue; |
| 459 | } |
| 460 | |
| 461 | let kind: |
| 462 | | InstructionKind.Let |
| 463 | | InstructionKind.HoistedConst |
| 464 | | InstructionKind.HoistedLet |
| 465 | | InstructionKind.HoistedFunction; |
| 466 | if (binding.kind === 'const' || binding.kind === 'var') { |
| 467 | kind = InstructionKind.HoistedConst; |
| 468 | } else if (binding.kind === 'let') { |
| 469 | kind = InstructionKind.HoistedLet; |
| 470 | } else if (binding.path.isFunctionDeclaration()) { |
| 471 | kind = InstructionKind.HoistedFunction; |
| 472 | } else if (!binding.path.isVariableDeclarator()) { |
| 473 | builder.recordError( |
| 474 | new CompilerErrorDetail({ |
| 475 | category: ErrorCategory.Todo, |
| 476 | reason: 'Unsupported declaration type for hoisting', |
| 477 | description: `variable "${binding.identifier.name}" declared with ${binding.path.type}`, |
| 478 | suggestions: null, |
| 479 | loc: id.parentPath.node.loc ?? GeneratedSource, |
| 480 | }), |
| 481 | ); |
| 482 | continue; |
| 483 | } else { |
| 484 | builder.recordError( |
| 485 | new CompilerErrorDetail({ |
| 486 | category: ErrorCategory.Todo, |
| 487 | reason: 'Handle non-const declarations for hoisting', |
| 488 | description: `variable "${binding.identifier.name}" declared with ${binding.kind}`, |
| 489 | suggestions: null, |
| 490 | loc: id.parentPath.node.loc ?? GeneratedSource, |
| 491 | }), |
| 492 | ); |
| 493 | continue; |
| 494 | } |
| 495 | |
| 496 | const identifier = builder.resolveIdentifier(id); |
| 497 | CompilerError.invariant(identifier.kind === 'Identifier', { |
| 498 | reason: |
| 499 | 'Expected hoisted binding to be a local identifier, not a global', |
| 500 | loc: id.node.loc ?? GeneratedSource, |
| 501 | }); |
| 502 | const place: Place = { |
| 503 | effect: Effect.Unknown, |
| 504 | identifier: identifier.identifier, |
| 505 | kind: 'Identifier', |
| 506 | reactive: false, |
| 507 | loc: id.node.loc ?? GeneratedSource, |
| 508 | }; |
| 509 | lowerValueToTemporary(builder, { |
| 510 | kind: 'DeclareContext', |
| 511 | lvalue: { |
| 512 | kind, |
| 513 | place, |
| 514 | }, |
| 515 | loc: id.node.loc ?? GeneratedSource, |
| 516 | }); |
| 517 | builder.environment.addHoistedIdentifier(binding.identifier); |
| 518 | } |
| 519 | lowerStatement(builder, s); |
| 520 | } |
| 521 | |
| 522 | return; |
| 523 | } |
| 524 | case 'BreakStatement': { |
| 525 | const stmt = stmtPath as NodePath<t.BreakStatement>; |
| 526 | const block = builder.lookupBreak(stmt.node.label?.name ?? null); |
| 527 | builder.terminate( |
| 528 | { |
| 529 | kind: 'goto', |
| 530 | block, |
| 531 | variant: GotoVariant.Break, |
| 532 | id: makeInstructionId(0), |
| 533 | loc: stmt.node.loc ?? GeneratedSource, |
| 534 | }, |
| 535 | 'block', |
| 536 | ); |
| 537 | return; |
| 538 | } |
| 539 | case 'ContinueStatement': { |
| 540 | const stmt = stmtPath as NodePath<t.ContinueStatement>; |
| 541 | const block = builder.lookupContinue(stmt.node.label?.name ?? null); |
| 542 | builder.terminate( |
| 543 | { |
| 544 | kind: 'goto', |
| 545 | block, |
| 546 | variant: GotoVariant.Continue, |
| 547 | id: makeInstructionId(0), |
| 548 | loc: stmt.node.loc ?? GeneratedSource, |
| 549 | }, |
| 550 | 'block', |
| 551 | ); |
| 552 | return; |
| 553 | } |
| 554 | case 'ForStatement': { |
| 555 | const stmt = stmtPath as NodePath<t.ForStatement>; |
| 556 | |
| 557 | const testBlock = builder.reserve('loop'); |
| 558 | // Block for code following the loop |
| 559 | const continuationBlock = builder.reserve('block'); |
| 560 | |
| 561 | const initBlock = builder.enter('loop', _blockId => { |
| 562 | const init = stmt.get('init'); |
| 563 | if (init.node == null) { |
| 564 | /* |
| 565 | * No init expression (e.g., `for (; ...)`), add a placeholder to avoid |
| 566 | * invariant about empty blocks |
| 567 | */ |
| 568 | lowerValueToTemporary(builder, { |
| 569 | kind: 'Primitive', |
| 570 | value: undefined, |
| 571 | loc: stmt.node.loc ?? GeneratedSource, |
| 572 | }); |
| 573 | return { |
| 574 | kind: 'goto', |
| 575 | block: testBlock.id, |
| 576 | variant: GotoVariant.Break, |
| 577 | id: makeInstructionId(0), |
| 578 | loc: stmt.node.loc ?? GeneratedSource, |
| 579 | }; |
| 580 | } |
| 581 | if (!init.isVariableDeclaration()) { |
| 582 | builder.recordError( |
| 583 | new CompilerErrorDetail({ |
| 584 | reason: |
| 585 | '(BuildHIR::lowerStatement) Handle non-variable initialization in ForStatement', |
| 586 | category: ErrorCategory.Todo, |
| 587 | loc: stmt.node.loc ?? null, |
| 588 | suggestions: null, |
| 589 | }), |
| 590 | ); |
| 591 | // Lower the init expression as best-effort and continue |
| 592 | if (init.isExpression()) { |
| 593 | lowerExpressionToTemporary(builder, init as NodePath<t.Expression>); |
| 594 | } |
| 595 | return { |
| 596 | kind: 'goto', |
| 597 | block: testBlock.id, |
| 598 | variant: GotoVariant.Break, |
| 599 | id: makeInstructionId(0), |
| 600 | loc: init.node?.loc ?? GeneratedSource, |
| 601 | }; |
| 602 | } |
| 603 | lowerStatement(builder, init); |
| 604 | return { |
| 605 | kind: 'goto', |
| 606 | block: testBlock.id, |
| 607 | variant: GotoVariant.Break, |
| 608 | id: makeInstructionId(0), |
| 609 | loc: init.node.loc ?? GeneratedSource, |
| 610 | }; |
| 611 | }); |
| 612 | |
| 613 | let updateBlock: BlockId | null = null; |
| 614 | const update = stmt.get('update'); |
| 615 | if (hasNode(update)) { |
| 616 | updateBlock = builder.enter('loop', _blockId => { |
| 617 | lowerExpressionToTemporary(builder, update); |
| 618 | return { |
| 619 | kind: 'goto', |
| 620 | block: testBlock.id, |
| 621 | variant: GotoVariant.Break, |
| 622 | id: makeInstructionId(0), |
| 623 | loc: update.node?.loc ?? GeneratedSource, |
| 624 | }; |
| 625 | }); |
| 626 | } |
| 627 | |
| 628 | const bodyBlock = builder.enter('block', _blockId => { |
| 629 | return builder.loop( |
| 630 | label, |
| 631 | updateBlock ?? testBlock.id, |
| 632 | continuationBlock.id, |
| 633 | () => { |
| 634 | const body = stmt.get('body'); |
| 635 | lowerStatement(builder, body); |
| 636 | return { |
| 637 | kind: 'goto', |
| 638 | block: updateBlock ?? testBlock.id, |
| 639 | variant: GotoVariant.Continue, |
| 640 | id: makeInstructionId(0), |
| 641 | loc: body.node.loc ?? GeneratedSource, |
| 642 | }; |
| 643 | }, |
| 644 | ); |
| 645 | }); |
| 646 | |
| 647 | builder.terminateWithContinuation( |
| 648 | { |
| 649 | kind: 'for', |
| 650 | loc: stmtNode.loc ?? GeneratedSource, |
| 651 | init: initBlock, |
| 652 | test: testBlock.id, |
| 653 | update: updateBlock, |
| 654 | loop: bodyBlock, |
| 655 | fallthrough: continuationBlock.id, |
| 656 | id: makeInstructionId(0), |
| 657 | }, |
| 658 | testBlock, |
| 659 | ); |
| 660 | |
| 661 | const test = stmt.get('test'); |
| 662 | if (test.node == null) { |
| 663 | builder.recordError( |
| 664 | new CompilerErrorDetail({ |
| 665 | reason: `(BuildHIR::lowerStatement) Handle empty test in ForStatement`, |
| 666 | category: ErrorCategory.Todo, |
| 667 | loc: stmt.node.loc ?? null, |
| 668 | suggestions: null, |
| 669 | }), |
| 670 | ); |
| 671 | // Treat `for(;;)` as `while(true)` to keep the builder state consistent |
| 672 | builder.terminateWithContinuation( |
| 673 | { |
| 674 | kind: 'branch', |
| 675 | test: lowerValueToTemporary(builder, { |
| 676 | kind: 'Primitive', |
| 677 | value: true, |
| 678 | loc: stmt.node.loc ?? GeneratedSource, |
| 679 | }), |
| 680 | consequent: bodyBlock, |
| 681 | alternate: continuationBlock.id, |
| 682 | fallthrough: continuationBlock.id, |
| 683 | id: makeInstructionId(0), |
| 684 | loc: stmt.node.loc ?? GeneratedSource, |
| 685 | }, |
| 686 | continuationBlock, |
| 687 | ); |
| 688 | } else { |
| 689 | builder.terminateWithContinuation( |
| 690 | { |
| 691 | kind: 'branch', |
| 692 | test: lowerExpressionToTemporary( |
| 693 | builder, |
| 694 | test as NodePath<t.Expression>, |
| 695 | ), |
| 696 | consequent: bodyBlock, |
| 697 | alternate: continuationBlock.id, |
| 698 | fallthrough: continuationBlock.id, |
| 699 | id: makeInstructionId(0), |
| 700 | loc: stmt.node.loc ?? GeneratedSource, |
| 701 | }, |
| 702 | continuationBlock, |
| 703 | ); |
| 704 | } |
| 705 | return; |
| 706 | } |
| 707 | case 'WhileStatement': { |
| 708 | const stmt = stmtPath as NodePath<t.WhileStatement>; |
| 709 | // Block used to evaluate whether to (re)enter or exit the loop |
| 710 | const conditionalBlock = builder.reserve('loop'); |
| 711 | // Block for code following the loop |
| 712 | const continuationBlock = builder.reserve('block'); |
| 713 | // Loop body |
| 714 | const loopBlock = builder.enter('block', _blockId => { |
| 715 | return builder.loop( |
| 716 | label, |
| 717 | conditionalBlock.id, |
| 718 | continuationBlock.id, |
| 719 | () => { |
| 720 | const body = stmt.get('body'); |
| 721 | lowerStatement(builder, body); |
| 722 | return { |
| 723 | kind: 'goto', |
| 724 | block: conditionalBlock.id, |
| 725 | variant: GotoVariant.Continue, |
| 726 | id: makeInstructionId(0), |
| 727 | loc: body.node.loc ?? GeneratedSource, |
| 728 | }; |
| 729 | }, |
| 730 | ); |
| 731 | }); |
| 732 | /* |
| 733 | * The code leading up to the loop must jump to the conditional block, |
| 734 | * to evaluate whether to enter the loop or bypass to the continuation. |
| 735 | */ |
| 736 | const loc = stmt.node.loc ?? GeneratedSource; |
| 737 | builder.terminateWithContinuation( |
| 738 | { |
| 739 | kind: 'while', |
| 740 | loc, |
| 741 | test: conditionalBlock.id, |
| 742 | loop: loopBlock, |
| 743 | fallthrough: continuationBlock.id, |
| 744 | id: makeInstructionId(0), |
| 745 | }, |
| 746 | conditionalBlock, |
| 747 | ); |
| 748 | const test = lowerExpressionToTemporary(builder, stmt.get('test')); |
| 749 | const terminal: BranchTerminal = { |
| 750 | kind: 'branch', |
| 751 | test, |
| 752 | consequent: loopBlock, |
| 753 | alternate: continuationBlock.id, |
| 754 | fallthrough: conditionalBlock.id, |
| 755 | id: makeInstructionId(0), |
| 756 | loc: stmt.node.loc ?? GeneratedSource, |
| 757 | }; |
| 758 | // Complete the conditional and continue with code after the loop |
| 759 | builder.terminateWithContinuation(terminal, continuationBlock); |
| 760 | return; |
| 761 | } |
| 762 | case 'LabeledStatement': { |
| 763 | const stmt = stmtPath as NodePath<t.LabeledStatement>; |
| 764 | const label = stmt.node.label.name; |
| 765 | const body = stmt.get('body'); |
| 766 | switch (body.node.type) { |
| 767 | case 'ForInStatement': |
| 768 | case 'ForOfStatement': |
| 769 | case 'ForStatement': |
| 770 | case 'WhileStatement': |
| 771 | case 'DoWhileStatement': { |
| 772 | /* |
| 773 | * labeled loops are special because of continue, so push the label |
| 774 | * down |
| 775 | */ |
| 776 | lowerStatement(builder, stmt.get('body'), label); |
| 777 | break; |
| 778 | } |
| 779 | default: { |
| 780 | /* |
| 781 | * All other statements create a continuation block to allow `break`, |
| 782 | * explicitly *don't* pass the label down |
| 783 | */ |
| 784 | const continuationBlock = builder.reserve('block'); |
| 785 | const block = builder.enter('block', () => { |
| 786 | const body = stmt.get('body'); |
| 787 | builder.label(label, continuationBlock.id, () => { |
| 788 | lowerStatement(builder, body); |
| 789 | }); |
| 790 | return { |
| 791 | kind: 'goto', |
| 792 | block: continuationBlock.id, |
| 793 | variant: GotoVariant.Break, |
| 794 | id: makeInstructionId(0), |
| 795 | loc: body.node.loc ?? GeneratedSource, |
| 796 | }; |
| 797 | }); |
| 798 | builder.terminateWithContinuation( |
| 799 | { |
| 800 | kind: 'label', |
| 801 | block, |
| 802 | fallthrough: continuationBlock.id, |
| 803 | id: makeInstructionId(0), |
| 804 | loc: stmt.node.loc ?? GeneratedSource, |
| 805 | }, |
| 806 | continuationBlock, |
| 807 | ); |
| 808 | } |
| 809 | } |
| 810 | return; |
| 811 | } |
| 812 | case 'SwitchStatement': { |
| 813 | const stmt = stmtPath as NodePath<t.SwitchStatement>; |
| 814 | // Block following the switch |
| 815 | const continuationBlock = builder.reserve('block'); |
| 816 | /* |
| 817 | * The goto target for any cases that fallthrough, which initially starts |
| 818 | * as the continuation block and is then updated as we iterate through cases |
| 819 | * in reverse order. |
| 820 | */ |
| 821 | let fallthrough = continuationBlock.id; |
| 822 | /* |
| 823 | * Iterate through cases in reverse order, so that previous blocks can fallthrough |
| 824 | * to successors |
| 825 | */ |
| 826 | const cases: Array<Case> = []; |
| 827 | let hasDefault = false; |
| 828 | for (let ii = stmt.get('cases').length - 1; ii >= 0; ii--) { |
| 829 | const case_: NodePath<t.SwitchCase> = stmt.get('cases')[ii]; |
| 830 | const testExpr = case_.get('test'); |
| 831 | if (testExpr.node == null) { |
| 832 | if (hasDefault) { |
| 833 | builder.recordError( |
| 834 | new CompilerErrorDetail({ |
| 835 | reason: `Expected at most one \`default\` branch in a switch statement, this code should have failed to parse`, |
| 836 | category: ErrorCategory.Syntax, |
| 837 | loc: case_.node.loc ?? null, |
| 838 | suggestions: null, |
| 839 | }), |
| 840 | ); |
| 841 | break; |
| 842 | } |
| 843 | hasDefault = true; |
| 844 | } |
| 845 | const block = builder.enter('block', _blockId => { |
| 846 | return builder.switch(label, continuationBlock.id, () => { |
| 847 | case_ |
| 848 | .get('consequent') |
| 849 | .forEach(consequent => lowerStatement(builder, consequent)); |
| 850 | /* |
| 851 | * always generate a fallthrough to the next block, this may be dead code |
| 852 | * if there was an explicit break, but if so it will be pruned later. |
| 853 | */ |
| 854 | return { |
| 855 | kind: 'goto', |
| 856 | block: fallthrough, |
| 857 | variant: GotoVariant.Break, |
| 858 | id: makeInstructionId(0), |
| 859 | loc: case_.node.loc ?? GeneratedSource, |
| 860 | }; |
| 861 | }); |
| 862 | }); |
| 863 | let test: Place | null = null; |
| 864 | if (hasNode(testExpr)) { |
| 865 | test = lowerReorderableExpression(builder, testExpr); |
| 866 | } |
| 867 | cases.push({ |
| 868 | test, |
| 869 | block, |
| 870 | }); |
| 871 | fallthrough = block; |
| 872 | } |
| 873 | /* |
| 874 | * it doesn't matter for our analysis purposes, but reverse the order of the cases |
| 875 | * back to the original to make it match the original code/intent. |
| 876 | */ |
| 877 | cases.reverse(); |
| 878 | /* |
| 879 | * If there wasn't an explicit default case, generate one to model the fact that execution |
| 880 | * could bypass any of the other cases and jump directly to the continuation. |
| 881 | */ |
| 882 | if (!hasDefault) { |
| 883 | cases.push({test: null, block: continuationBlock.id}); |
| 884 | } |
| 885 | |
| 886 | const test = lowerExpressionToTemporary( |
| 887 | builder, |
| 888 | stmt.get('discriminant'), |
| 889 | ); |
| 890 | builder.terminateWithContinuation( |
| 891 | { |
| 892 | kind: 'switch', |
| 893 | test, |
| 894 | cases, |
| 895 | fallthrough: continuationBlock.id, |
| 896 | id: makeInstructionId(0), |
| 897 | loc: stmt.node.loc ?? GeneratedSource, |
| 898 | }, |
| 899 | continuationBlock, |
| 900 | ); |
| 901 | return; |
| 902 | } |
| 903 | case 'VariableDeclaration': { |
| 904 | const stmt = stmtPath as NodePath<t.VariableDeclaration>; |
| 905 | const nodeKind: t.VariableDeclaration['kind'] = stmt.node.kind; |
| 906 | if ( |
| 907 | nodeKind === 'var' || |
| 908 | nodeKind === 'using' || |
| 909 | nodeKind === 'await using' |
| 910 | ) { |
| 911 | builder.recordError( |
| 912 | new CompilerErrorDetail({ |
| 913 | reason: `(BuildHIR::lowerStatement) Handle ${nodeKind} kinds in VariableDeclaration`, |
| 914 | category: ErrorCategory.Todo, |
| 915 | loc: stmt.node.loc ?? null, |
| 916 | suggestions: null, |
| 917 | }), |
| 918 | ); |
| 919 | /* |
| 920 | * Treat `var` as `let` and `using`/`await using` as `const` so |
| 921 | * references to the variable don't break while the error unwinds |
| 922 | */ |
| 923 | } |
| 924 | const kind = |
| 925 | nodeKind === 'let' || nodeKind === 'var' |
| 926 | ? InstructionKind.Let |
| 927 | : InstructionKind.Const; |
| 928 | for (const declaration of stmt.get('declarations')) { |
| 929 | const id = declaration.get('id'); |
| 930 | const init = declaration.get('init'); |
| 931 | if (hasNode(init)) { |
| 932 | const value = lowerExpressionToTemporary(builder, init); |
| 933 | lowerAssignment( |
| 934 | builder, |
| 935 | stmt.node.loc ?? GeneratedSource, |
| 936 | kind, |
| 937 | id, |
| 938 | value, |
| 939 | id.isObjectPattern() || id.isArrayPattern() |
| 940 | ? 'Destructure' |
| 941 | : 'Assignment', |
| 942 | ); |
| 943 | } else if (id.isIdentifier()) { |
| 944 | const binding = builder.resolveIdentifier(id); |
| 945 | if (binding.kind !== 'Identifier') { |
| 946 | builder.recordError( |
| 947 | new CompilerErrorDetail({ |
| 948 | reason: `(BuildHIR::lowerAssignment) Could not find binding for declaration.`, |
| 949 | category: ErrorCategory.Invariant, |
| 950 | loc: id.node.loc ?? null, |
| 951 | suggestions: null, |
| 952 | }), |
| 953 | ); |
| 954 | } else { |
| 955 | const place: Place = { |
| 956 | effect: Effect.Unknown, |
| 957 | identifier: binding.identifier, |
| 958 | kind: 'Identifier', |
| 959 | reactive: false, |
| 960 | loc: id.node.loc ?? GeneratedSource, |
| 961 | }; |
| 962 | if (builder.isContextIdentifier(id)) { |
| 963 | if (kind === InstructionKind.Const) { |
| 964 | const declRangeStart = declaration.parentPath.node.start!; |
| 965 | builder.recordError( |
| 966 | new CompilerErrorDetail({ |
| 967 | reason: `Expect \`const\` declaration not to be reassigned`, |
| 968 | category: ErrorCategory.Syntax, |
| 969 | loc: id.node.loc ?? null, |
| 970 | suggestions: [ |
| 971 | { |
| 972 | description: 'Change to a `let` declaration', |
| 973 | op: CompilerSuggestionOperation.Replace, |
| 974 | range: [declRangeStart, declRangeStart + 5], // "const".length |
| 975 | text: 'let', |
| 976 | }, |
| 977 | ], |
| 978 | }), |
| 979 | ); |
| 980 | } |
| 981 | lowerValueToTemporary(builder, { |
| 982 | kind: 'DeclareContext', |
| 983 | lvalue: { |
| 984 | kind: InstructionKind.Let, |
| 985 | place, |
| 986 | }, |
| 987 | loc: id.node.loc ?? GeneratedSource, |
| 988 | }); |
| 989 | } else { |
| 990 | const typeAnnotation = id.get('typeAnnotation'); |
| 991 | let type: t.FlowType | t.TSType | null; |
| 992 | if (typeAnnotation.isTSTypeAnnotation()) { |
| 993 | const typePath = typeAnnotation.get('typeAnnotation'); |
| 994 | type = typePath.node; |
| 995 | } else if (typeAnnotation.isTypeAnnotation()) { |
| 996 | const typePath = typeAnnotation.get('typeAnnotation'); |
| 997 | type = typePath.node; |
| 998 | } else { |
| 999 | type = null; |
| 1000 | } |
| 1001 | lowerValueToTemporary(builder, { |
| 1002 | kind: 'DeclareLocal', |
| 1003 | lvalue: { |
| 1004 | kind, |
| 1005 | place, |
| 1006 | }, |
| 1007 | type, |
| 1008 | loc: id.node.loc ?? GeneratedSource, |
| 1009 | }); |
| 1010 | } |
| 1011 | } |
| 1012 | } else { |
| 1013 | builder.recordError( |
| 1014 | new CompilerErrorDetail({ |
| 1015 | reason: `Expected variable declaration to be an identifier if no initializer was provided`, |
| 1016 | description: `Got a \`${id.type}\``, |
| 1017 | category: ErrorCategory.Syntax, |
| 1018 | loc: stmt.node.loc ?? null, |
| 1019 | suggestions: null, |
| 1020 | }), |
| 1021 | ); |
| 1022 | } |
| 1023 | } |
| 1024 | return; |
| 1025 | } |
| 1026 | case 'ExpressionStatement': { |
| 1027 | const stmt = stmtPath as NodePath<t.ExpressionStatement>; |
| 1028 | const expression = stmt.get('expression'); |
| 1029 | lowerExpressionToTemporary(builder, expression); |
| 1030 | return; |
| 1031 | } |
| 1032 | case 'DoWhileStatement': { |
| 1033 | const stmt = stmtPath as NodePath<t.DoWhileStatement>; |
| 1034 | // Block used to evaluate whether to (re)enter or exit the loop |
| 1035 | const conditionalBlock = builder.reserve('loop'); |
| 1036 | // Block for code following the loop |
| 1037 | const continuationBlock = builder.reserve('block'); |
| 1038 | // Loop body, executed at least once uncondtionally prior to exit |
| 1039 | const loopBlock = builder.enter('block', _loopBlockId => { |
| 1040 | return builder.loop( |
| 1041 | label, |
| 1042 | conditionalBlock.id, |
| 1043 | continuationBlock.id, |
| 1044 | () => { |
| 1045 | const body = stmt.get('body'); |
| 1046 | lowerStatement(builder, body); |
| 1047 | return { |
| 1048 | kind: 'goto', |
| 1049 | block: conditionalBlock.id, |
| 1050 | variant: GotoVariant.Continue, |
| 1051 | id: makeInstructionId(0), |
| 1052 | loc: body.node.loc ?? GeneratedSource, |
| 1053 | }; |
| 1054 | }, |
| 1055 | ); |
| 1056 | }); |
| 1057 | /* |
| 1058 | * Jump to the conditional block to evaluate whether to (re)enter the loop or exit to the |
| 1059 | * continuation block. |
| 1060 | */ |
| 1061 | const loc = stmt.node.loc ?? GeneratedSource; |
| 1062 | builder.terminateWithContinuation( |
| 1063 | { |
| 1064 | kind: 'do-while', |
| 1065 | loc, |
| 1066 | test: conditionalBlock.id, |
| 1067 | loop: loopBlock, |
| 1068 | fallthrough: continuationBlock.id, |
| 1069 | id: makeInstructionId(0), |
| 1070 | }, |
| 1071 | conditionalBlock, |
| 1072 | ); |
| 1073 | /* |
| 1074 | * The conditional block is empty and exists solely as conditional for |
| 1075 | * (re)entering or exiting the loop |
| 1076 | */ |
| 1077 | const test = lowerExpressionToTemporary(builder, stmt.get('test')); |
| 1078 | const terminal: BranchTerminal = { |
| 1079 | kind: 'branch', |
| 1080 | test, |
| 1081 | consequent: loopBlock, |
| 1082 | alternate: continuationBlock.id, |
| 1083 | fallthrough: conditionalBlock.id, |
| 1084 | id: makeInstructionId(0), |
| 1085 | loc, |
| 1086 | }; |
| 1087 | // Complete the conditional and continue with code after the loop |
| 1088 | builder.terminateWithContinuation(terminal, continuationBlock); |
| 1089 | return; |
| 1090 | } |
| 1091 | case 'FunctionDeclaration': { |
| 1092 | const stmt = stmtPath as NodePath<t.FunctionDeclaration>; |
| 1093 | stmt.skip(); |
| 1094 | CompilerError.invariant(stmt.get('id').type === 'Identifier', { |
| 1095 | reason: 'function declarations must have a name', |
| 1096 | loc: stmt.node.loc ?? GeneratedSource, |
| 1097 | }); |
| 1098 | const id = stmt.get('id') as NodePath<t.Identifier>; |
| 1099 | |
| 1100 | const fn = lowerValueToTemporary( |
| 1101 | builder, |
| 1102 | lowerFunctionToValue(builder, stmt), |
| 1103 | ); |
| 1104 | lowerAssignment( |
| 1105 | builder, |
| 1106 | stmt.node.loc ?? GeneratedSource, |
| 1107 | InstructionKind.Function, |
| 1108 | id, |
| 1109 | fn, |
| 1110 | 'Assignment', |
| 1111 | ); |
| 1112 | |
| 1113 | return; |
| 1114 | } |
| 1115 | case 'ForOfStatement': { |
| 1116 | const stmt = stmtPath as NodePath<t.ForOfStatement>; |
| 1117 | const continuationBlock = builder.reserve('block'); |
| 1118 | const initBlock = builder.reserve('loop'); |
| 1119 | const testBlock = builder.reserve('loop'); |
| 1120 | |
| 1121 | if (stmt.node.await) { |
| 1122 | builder.recordError( |
| 1123 | new CompilerErrorDetail({ |
| 1124 | reason: `(BuildHIR::lowerStatement) Handle for-await loops`, |
| 1125 | category: ErrorCategory.Todo, |
| 1126 | loc: stmt.node.loc ?? null, |
| 1127 | suggestions: null, |
| 1128 | }), |
| 1129 | ); |
| 1130 | return; |
| 1131 | } |
| 1132 | |
| 1133 | const loopBlock = builder.enter('block', _blockId => { |
| 1134 | return builder.loop(label, initBlock.id, continuationBlock.id, () => { |
| 1135 | const body = stmt.get('body'); |
| 1136 | lowerStatement(builder, body); |
| 1137 | return { |
| 1138 | kind: 'goto', |
| 1139 | block: initBlock.id, |
| 1140 | variant: GotoVariant.Continue, |
| 1141 | id: makeInstructionId(0), |
| 1142 | loc: body.node.loc ?? GeneratedSource, |
| 1143 | }; |
| 1144 | }); |
| 1145 | }); |
| 1146 | |
| 1147 | const loc = stmt.node.loc ?? GeneratedSource; |
| 1148 | const value = lowerExpressionToTemporary(builder, stmt.get('right')); |
| 1149 | builder.terminateWithContinuation( |
| 1150 | { |
| 1151 | kind: 'for-of', |
| 1152 | loc, |
| 1153 | init: initBlock.id, |
| 1154 | test: testBlock.id, |
| 1155 | loop: loopBlock, |
| 1156 | fallthrough: continuationBlock.id, |
| 1157 | id: makeInstructionId(0), |
| 1158 | }, |
| 1159 | initBlock, |
| 1160 | ); |
| 1161 | |
| 1162 | /* |
| 1163 | * The init of a ForOf statement is compound over a left (VariableDeclaration | LVal) and |
| 1164 | * right (Expression), so we synthesize a new InstrValue and assignment (potentially multiple |
| 1165 | * instructions when we handle other syntax like Patterns) |
| 1166 | */ |
| 1167 | const iterator = lowerValueToTemporary(builder, { |
| 1168 | kind: 'GetIterator', |
| 1169 | loc: value.loc, |
| 1170 | collection: {...value}, |
| 1171 | }); |
| 1172 | builder.terminateWithContinuation( |
| 1173 | { |
| 1174 | id: makeInstructionId(0), |
| 1175 | kind: 'goto', |
| 1176 | block: testBlock.id, |
| 1177 | variant: GotoVariant.Break, |
| 1178 | loc: stmt.node.loc ?? GeneratedSource, |
| 1179 | }, |
| 1180 | testBlock, |
| 1181 | ); |
| 1182 | |
| 1183 | const left = stmt.get('left'); |
| 1184 | const leftLoc = left.node.loc ?? GeneratedSource; |
| 1185 | let test: Place; |
| 1186 | const advanceIterator = lowerValueToTemporary(builder, { |
| 1187 | kind: 'IteratorNext', |
| 1188 | loc: leftLoc, |
| 1189 | iterator: {...iterator}, |
| 1190 | collection: {...value}, |
| 1191 | }); |
| 1192 | if (left.isVariableDeclaration()) { |
| 1193 | const declarations = left.get('declarations'); |
| 1194 | CompilerError.invariant(declarations.length === 1, { |
| 1195 | reason: `Expected only one declaration in the init of a ForOfStatement, got ${declarations.length}`, |
| 1196 | loc: left.node.loc ?? GeneratedSource, |
| 1197 | }); |
| 1198 | const id = declarations[0].get('id'); |
| 1199 | const assign = lowerAssignment( |
| 1200 | builder, |
| 1201 | leftLoc, |
| 1202 | InstructionKind.Let, |
| 1203 | id, |
| 1204 | advanceIterator, |
| 1205 | 'Assignment', |
| 1206 | ); |
| 1207 | test = lowerValueToTemporary(builder, assign); |
| 1208 | } else { |
| 1209 | CompilerError.invariant(left.isLVal(), { |
| 1210 | reason: 'Expected ForOf init to be a variable declaration or lval', |
| 1211 | loc: leftLoc, |
| 1212 | }); |
| 1213 | const assign = lowerAssignment( |
| 1214 | builder, |
| 1215 | leftLoc, |
| 1216 | InstructionKind.Reassign, |
| 1217 | left, |
| 1218 | advanceIterator, |
| 1219 | 'Assignment', |
| 1220 | ); |
| 1221 | test = lowerValueToTemporary(builder, assign); |
| 1222 | } |
| 1223 | builder.terminateWithContinuation( |
| 1224 | { |
| 1225 | id: makeInstructionId(0), |
| 1226 | kind: 'branch', |
| 1227 | test, |
| 1228 | consequent: loopBlock, |
| 1229 | alternate: continuationBlock.id, |
| 1230 | loc: stmt.node.loc ?? GeneratedSource, |
| 1231 | fallthrough: continuationBlock.id, |
| 1232 | }, |
| 1233 | continuationBlock, |
| 1234 | ); |
| 1235 | return; |
| 1236 | } |
| 1237 | case 'ForInStatement': { |
| 1238 | const stmt = stmtPath as NodePath<t.ForInStatement>; |
| 1239 | const continuationBlock = builder.reserve('block'); |
| 1240 | const initBlock = builder.reserve('loop'); |
| 1241 | |
| 1242 | const loopBlock = builder.enter('block', _blockId => { |
| 1243 | return builder.loop(label, initBlock.id, continuationBlock.id, () => { |
| 1244 | const body = stmt.get('body'); |
| 1245 | lowerStatement(builder, body); |
| 1246 | return { |
| 1247 | kind: 'goto', |
| 1248 | block: initBlock.id, |
| 1249 | variant: GotoVariant.Continue, |
| 1250 | id: makeInstructionId(0), |
| 1251 | loc: body.node.loc ?? GeneratedSource, |
| 1252 | }; |
| 1253 | }); |
| 1254 | }); |
| 1255 | |
| 1256 | const loc = stmt.node.loc ?? GeneratedSource; |
| 1257 | const value = lowerExpressionToTemporary(builder, stmt.get('right')); |
| 1258 | builder.terminateWithContinuation( |
| 1259 | { |
| 1260 | kind: 'for-in', |
| 1261 | loc, |
| 1262 | init: initBlock.id, |
| 1263 | loop: loopBlock, |
| 1264 | fallthrough: continuationBlock.id, |
| 1265 | id: makeInstructionId(0), |
| 1266 | }, |
| 1267 | initBlock, |
| 1268 | ); |
| 1269 | |
| 1270 | /* |
| 1271 | * The init of a ForIn statement is compound over a left (VariableDeclaration | LVal) and |
| 1272 | * right (Expression), so we synthesize a new InstrValue and assignment (potentially multiple |
| 1273 | * instructions when we handle other syntax like Patterns) |
| 1274 | */ |
| 1275 | const left = stmt.get('left'); |
| 1276 | const leftLoc = left.node.loc ?? GeneratedSource; |
| 1277 | let test: Place; |
| 1278 | const nextPropertyTemp = lowerValueToTemporary(builder, { |
| 1279 | kind: 'NextPropertyOf', |
| 1280 | loc: leftLoc, |
| 1281 | value, |
| 1282 | }); |
| 1283 | if (left.isVariableDeclaration()) { |
| 1284 | const declarations = left.get('declarations'); |
| 1285 | CompilerError.invariant(declarations.length === 1, { |
| 1286 | reason: `Expected only one declaration in the init of a ForInStatement, got ${declarations.length}`, |
| 1287 | loc: left.node.loc ?? GeneratedSource, |
| 1288 | }); |
| 1289 | const id = declarations[0].get('id'); |
| 1290 | const assign = lowerAssignment( |
| 1291 | builder, |
| 1292 | leftLoc, |
| 1293 | InstructionKind.Let, |
| 1294 | id, |
| 1295 | nextPropertyTemp, |
| 1296 | 'Assignment', |
| 1297 | ); |
| 1298 | test = lowerValueToTemporary(builder, assign); |
| 1299 | } else { |
| 1300 | CompilerError.invariant(left.isLVal(), { |
| 1301 | reason: 'Expected ForIn init to be a variable declaration or lval', |
| 1302 | loc: leftLoc, |
| 1303 | }); |
| 1304 | const assign = lowerAssignment( |
| 1305 | builder, |
| 1306 | leftLoc, |
| 1307 | InstructionKind.Reassign, |
| 1308 | left, |
| 1309 | nextPropertyTemp, |
| 1310 | 'Assignment', |
| 1311 | ); |
| 1312 | test = lowerValueToTemporary(builder, assign); |
| 1313 | } |
| 1314 | builder.terminateWithContinuation( |
| 1315 | { |
| 1316 | id: makeInstructionId(0), |
| 1317 | kind: 'branch', |
| 1318 | test, |
| 1319 | consequent: loopBlock, |
| 1320 | alternate: continuationBlock.id, |
| 1321 | fallthrough: continuationBlock.id, |
| 1322 | loc: stmt.node.loc ?? GeneratedSource, |
| 1323 | }, |
| 1324 | continuationBlock, |
| 1325 | ); |
| 1326 | return; |
| 1327 | } |
| 1328 | case 'DebuggerStatement': { |
| 1329 | const stmt = stmtPath as NodePath<t.DebuggerStatement>; |
| 1330 | const loc = stmt.node.loc ?? GeneratedSource; |
| 1331 | builder.push({ |
| 1332 | id: makeInstructionId(0), |
| 1333 | lvalue: buildTemporaryPlace(builder, loc), |
| 1334 | value: { |
| 1335 | kind: 'Debugger', |
| 1336 | loc, |
| 1337 | }, |
| 1338 | effects: null, |
| 1339 | loc, |
| 1340 | }); |
| 1341 | return; |
| 1342 | } |
| 1343 | case 'EmptyStatement': { |
| 1344 | return; |
| 1345 | } |
| 1346 | case 'TryStatement': { |
| 1347 | const stmt = stmtPath as NodePath<t.TryStatement>; |
| 1348 | const continuationBlock = builder.reserve('block'); |
| 1349 | |
| 1350 | const handlerPath = stmt.get('handler'); |
| 1351 | if (!hasNode(handlerPath)) { |
| 1352 | builder.recordError( |
| 1353 | new CompilerErrorDetail({ |
| 1354 | reason: `(BuildHIR::lowerStatement) Handle TryStatement without a catch clause`, |
| 1355 | category: ErrorCategory.Todo, |
| 1356 | loc: stmt.node.loc ?? null, |
| 1357 | suggestions: null, |
| 1358 | }), |
| 1359 | ); |
| 1360 | return; |
| 1361 | } |
| 1362 | if (hasNode(stmt.get('finalizer'))) { |
| 1363 | builder.recordError( |
| 1364 | new CompilerErrorDetail({ |
| 1365 | reason: `(BuildHIR::lowerStatement) Handle TryStatement with a finalizer ('finally') clause`, |
| 1366 | category: ErrorCategory.Todo, |
| 1367 | loc: stmt.node.loc ?? null, |
| 1368 | suggestions: null, |
| 1369 | }), |
| 1370 | ); |
| 1371 | } |
| 1372 | |
| 1373 | const handlerBindingPath = handlerPath.get('param'); |
| 1374 | let handlerBinding: { |
| 1375 | place: Place; |
| 1376 | path: NodePath<t.Identifier | t.ArrayPattern | t.ObjectPattern>; |
| 1377 | } | null = null; |
| 1378 | if (hasNode(handlerBindingPath)) { |
| 1379 | const place: Place = { |
| 1380 | kind: 'Identifier', |
| 1381 | identifier: builder.makeTemporary( |
| 1382 | handlerBindingPath.node.loc ?? GeneratedSource, |
| 1383 | ), |
| 1384 | effect: Effect.Unknown, |
| 1385 | reactive: false, |
| 1386 | loc: handlerBindingPath.node.loc ?? GeneratedSource, |
| 1387 | }; |
| 1388 | promoteTemporary(place.identifier); |
| 1389 | lowerValueToTemporary(builder, { |
| 1390 | kind: 'DeclareLocal', |
| 1391 | lvalue: { |
| 1392 | kind: InstructionKind.Catch, |
| 1393 | place: {...place}, |
| 1394 | }, |
| 1395 | type: null, |
| 1396 | loc: handlerBindingPath.node.loc ?? GeneratedSource, |
| 1397 | }); |
| 1398 | |
| 1399 | handlerBinding = { |
| 1400 | path: handlerBindingPath, |
| 1401 | place, |
| 1402 | }; |
| 1403 | } |
| 1404 | |
| 1405 | const handler = builder.enter('catch', _blockId => { |
| 1406 | if (handlerBinding !== null) { |
| 1407 | lowerAssignment( |
| 1408 | builder, |
| 1409 | handlerBinding.path.node.loc ?? GeneratedSource, |
| 1410 | InstructionKind.Catch, |
| 1411 | handlerBinding.path, |
| 1412 | {...handlerBinding.place}, |
| 1413 | 'Assignment', |
| 1414 | ); |
| 1415 | } |
| 1416 | lowerStatement(builder, handlerPath.get('body')); |
| 1417 | return { |
| 1418 | kind: 'goto', |
| 1419 | block: continuationBlock.id, |
| 1420 | variant: GotoVariant.Break, |
| 1421 | id: makeInstructionId(0), |
| 1422 | loc: handlerPath.node.loc ?? GeneratedSource, |
| 1423 | }; |
| 1424 | }); |
| 1425 | |
| 1426 | const block = builder.enter('block', _blockId => { |
| 1427 | const block = stmt.get('block'); |
| 1428 | builder.enterTryCatch(handler, () => { |
| 1429 | lowerStatement(builder, block); |
| 1430 | }); |
| 1431 | return { |
| 1432 | kind: 'goto', |
| 1433 | block: continuationBlock.id, |
| 1434 | variant: GotoVariant.Try, |
| 1435 | id: makeInstructionId(0), |
| 1436 | loc: block.node.loc ?? GeneratedSource, |
| 1437 | }; |
| 1438 | }); |
| 1439 | |
| 1440 | builder.terminateWithContinuation( |
| 1441 | { |
| 1442 | kind: 'try', |
| 1443 | block, |
| 1444 | handlerBinding: |
| 1445 | handlerBinding !== null ? {...handlerBinding.place} : null, |
| 1446 | handler, |
| 1447 | fallthrough: continuationBlock.id, |
| 1448 | id: makeInstructionId(0), |
| 1449 | loc: stmt.node.loc ?? GeneratedSource, |
| 1450 | }, |
| 1451 | continuationBlock, |
| 1452 | ); |
| 1453 | |
| 1454 | return; |
| 1455 | } |
| 1456 | case 'WithStatement': { |
| 1457 | builder.recordError( |
| 1458 | new CompilerErrorDetail({ |
| 1459 | reason: `JavaScript 'with' syntax is not supported`, |
| 1460 | description: `'with' syntax is considered deprecated and removed from JavaScript standards, consider alternatives`, |
| 1461 | category: ErrorCategory.UnsupportedSyntax, |
| 1462 | loc: stmtPath.node.loc ?? null, |
| 1463 | suggestions: null, |
| 1464 | }), |
| 1465 | ); |
| 1466 | lowerValueToTemporary(builder, { |
| 1467 | kind: 'UnsupportedNode', |
| 1468 | loc: stmtPath.node.loc ?? GeneratedSource, |
| 1469 | node: stmtPath.node, |
| 1470 | }); |
| 1471 | return; |
| 1472 | } |
| 1473 | case 'ClassDeclaration': { |
| 1474 | /** |
| 1475 | * In theory we could support inline class declarations, but this is rare enough in practice |
| 1476 | * and complex enough to support that we don't anticipate supporting anytime soon. Developers |
| 1477 | * are encouraged to lift classes out of component/hook declarations. |
| 1478 | */ |
| 1479 | builder.recordError( |
| 1480 | new CompilerErrorDetail({ |
| 1481 | reason: 'Inline `class` declarations are not supported', |
| 1482 | description: `Move class declarations outside of components/hooks`, |
| 1483 | category: ErrorCategory.UnsupportedSyntax, |
| 1484 | loc: stmtPath.node.loc ?? null, |
| 1485 | suggestions: null, |
| 1486 | }), |
| 1487 | ); |
| 1488 | lowerValueToTemporary(builder, { |
| 1489 | kind: 'UnsupportedNode', |
| 1490 | loc: stmtPath.node.loc ?? GeneratedSource, |
| 1491 | node: stmtPath.node, |
| 1492 | }); |
| 1493 | return; |
| 1494 | } |
| 1495 | case 'EnumDeclaration': |
| 1496 | case 'TSEnumDeclaration': { |
| 1497 | lowerValueToTemporary(builder, { |
| 1498 | kind: 'UnsupportedNode', |
| 1499 | loc: stmtPath.node.loc ?? GeneratedSource, |
| 1500 | node: stmtPath.node, |
| 1501 | }); |
| 1502 | return; |
| 1503 | } |
| 1504 | case 'ExportAllDeclaration': |
| 1505 | case 'ExportDefaultDeclaration': |
| 1506 | case 'ExportNamedDeclaration': |
| 1507 | case 'ImportDeclaration': |
| 1508 | case 'TSExportAssignment': |
| 1509 | case 'TSImportEqualsDeclaration': { |
| 1510 | builder.recordError( |
| 1511 | new CompilerErrorDetail({ |
| 1512 | reason: |
| 1513 | 'JavaScript `import` and `export` statements may only appear at the top level of a module', |
| 1514 | category: ErrorCategory.Syntax, |
| 1515 | loc: stmtPath.node.loc ?? null, |
| 1516 | suggestions: null, |
| 1517 | }), |
| 1518 | ); |
| 1519 | lowerValueToTemporary(builder, { |
| 1520 | kind: 'UnsupportedNode', |
| 1521 | loc: stmtPath.node.loc ?? GeneratedSource, |
| 1522 | node: stmtPath.node, |
| 1523 | }); |
| 1524 | return; |
| 1525 | } |
| 1526 | case 'TSNamespaceExportDeclaration': { |
| 1527 | builder.recordError( |
| 1528 | new CompilerErrorDetail({ |
| 1529 | reason: |
| 1530 | 'TypeScript `namespace` statements may only appear at the top level of a module', |
| 1531 | category: ErrorCategory.Syntax, |
| 1532 | loc: stmtPath.node.loc ?? null, |
| 1533 | suggestions: null, |
| 1534 | }), |
| 1535 | ); |
| 1536 | lowerValueToTemporary(builder, { |
| 1537 | kind: 'UnsupportedNode', |
| 1538 | loc: stmtPath.node.loc ?? GeneratedSource, |
| 1539 | node: stmtPath.node, |
| 1540 | }); |
| 1541 | return; |
| 1542 | } |
| 1543 | case 'DeclareClass': |
| 1544 | case 'DeclareExportAllDeclaration': |
| 1545 | case 'DeclareExportDeclaration': |
| 1546 | case 'DeclareFunction': |
| 1547 | case 'DeclareInterface': |
| 1548 | case 'DeclareModule': |
| 1549 | case 'DeclareModuleExports': |
| 1550 | case 'DeclareOpaqueType': |
| 1551 | case 'DeclareTypeAlias': |
| 1552 | case 'DeclareVariable': |
| 1553 | case 'InterfaceDeclaration': |
| 1554 | case 'OpaqueType': |
| 1555 | case 'TSDeclareFunction': |
| 1556 | case 'TSInterfaceDeclaration': |
| 1557 | case 'TSModuleDeclaration': |
| 1558 | case 'TSTypeAliasDeclaration': |
| 1559 | case 'TypeAlias': { |
| 1560 | // We do not preserve type annotations/syntax through transformation |
| 1561 | return; |
| 1562 | } |
| 1563 | default: { |
| 1564 | return assertExhaustive( |
| 1565 | stmtNode, |
| 1566 | `Unsupported statement kind '${ |
| 1567 | (stmtNode as any as NodePath<t.Statement>).type |
| 1568 | }'`, |
| 1569 | ); |
| 1570 | } |
| 1571 | } |
| 1572 | } |
| 1573 | |
| 1574 | function lowerObjectMethod( |
| 1575 | builder: HIRBuilder, |
| 1576 | property: NodePath<t.ObjectMethod>, |
| 1577 | ): InstructionValue { |
| 1578 | const loc = property.node.loc ?? GeneratedSource; |
| 1579 | const loweredFunc = lowerFunction(builder, property); |
| 1580 | |
| 1581 | return { |
| 1582 | kind: 'ObjectMethod', |
| 1583 | loc, |
| 1584 | loweredFunc, |
| 1585 | }; |
| 1586 | } |
| 1587 | |
| 1588 | function lowerObjectPropertyKey( |
| 1589 | builder: HIRBuilder, |
| 1590 | property: NodePath<t.ObjectProperty | t.ObjectMethod>, |
| 1591 | ): ObjectPropertyKey | null { |
| 1592 | const key = property.get('key'); |
| 1593 | if (key.isStringLiteral()) { |
| 1594 | return { |
| 1595 | kind: 'string', |
| 1596 | name: key.node.value, |
| 1597 | }; |
| 1598 | } else if (property.node.computed && key.isExpression()) { |
| 1599 | const place = lowerExpressionToTemporary(builder, key); |
| 1600 | return { |
| 1601 | kind: 'computed', |
| 1602 | name: place, |
| 1603 | }; |
| 1604 | } else if (key.isIdentifier()) { |
| 1605 | return { |
| 1606 | kind: 'identifier', |
| 1607 | name: key.node.name, |
| 1608 | }; |
| 1609 | } else if (key.isNumericLiteral()) { |
| 1610 | return { |
| 1611 | kind: 'identifier', |
| 1612 | name: String(key.node.value), |
| 1613 | }; |
| 1614 | } |
| 1615 | |
| 1616 | builder.recordError( |
| 1617 | new CompilerErrorDetail({ |
| 1618 | reason: `(BuildHIR::lowerExpression) Expected Identifier, got ${key.type} key in ObjectExpression`, |
| 1619 | category: ErrorCategory.Todo, |
| 1620 | loc: key.node.loc ?? null, |
| 1621 | suggestions: null, |
| 1622 | }), |
| 1623 | ); |
| 1624 | return null; |
| 1625 | } |
| 1626 | |
| 1627 | function lowerExpression( |
| 1628 | builder: HIRBuilder, |
| 1629 | exprPath: NodePath<t.Expression>, |
| 1630 | ): InstructionValue { |
| 1631 | const exprNode = exprPath.node; |
| 1632 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 1633 | switch (exprNode.type) { |
| 1634 | case 'Identifier': { |
| 1635 | const expr = exprPath as NodePath<t.Identifier>; |
| 1636 | const place = lowerIdentifier(builder, expr); |
| 1637 | return { |
| 1638 | kind: getLoadKind(builder, expr), |
| 1639 | place, |
| 1640 | loc: exprLoc, |
| 1641 | }; |
| 1642 | } |
| 1643 | case 'NullLiteral': { |
| 1644 | return { |
| 1645 | kind: 'Primitive', |
| 1646 | value: null, |
| 1647 | loc: exprLoc, |
| 1648 | }; |
| 1649 | } |
| 1650 | case 'BooleanLiteral': |
| 1651 | case 'NumericLiteral': |
| 1652 | case 'StringLiteral': { |
| 1653 | const expr = exprPath as NodePath< |
| 1654 | t.StringLiteral | t.BooleanLiteral | t.NumericLiteral |
| 1655 | >; |
| 1656 | const value = expr.node.value; |
| 1657 | return { |
| 1658 | kind: 'Primitive', |
| 1659 | value, |
| 1660 | loc: exprLoc, |
| 1661 | }; |
| 1662 | } |
| 1663 | case 'ObjectExpression': { |
| 1664 | const expr = exprPath as NodePath<t.ObjectExpression>; |
| 1665 | const propertyPaths = expr.get('properties'); |
| 1666 | const properties: Array<ObjectProperty | SpreadPattern> = []; |
| 1667 | for (const propertyPath of propertyPaths) { |
| 1668 | if (propertyPath.isObjectProperty()) { |
| 1669 | const loweredKey = lowerObjectPropertyKey(builder, propertyPath); |
| 1670 | if (!loweredKey) { |
| 1671 | continue; |
| 1672 | } |
| 1673 | const valuePath = propertyPath.get('value'); |
| 1674 | if (!valuePath.isExpression()) { |
| 1675 | builder.recordError( |
| 1676 | new CompilerErrorDetail({ |
| 1677 | reason: `(BuildHIR::lowerExpression) Handle ${valuePath.type} values in ObjectExpression`, |
| 1678 | category: ErrorCategory.Todo, |
| 1679 | loc: valuePath.node.loc ?? null, |
| 1680 | suggestions: null, |
| 1681 | }), |
| 1682 | ); |
| 1683 | continue; |
| 1684 | } |
| 1685 | const value = lowerExpressionToTemporary(builder, valuePath); |
| 1686 | properties.push({ |
| 1687 | kind: 'ObjectProperty', |
| 1688 | type: 'property', |
| 1689 | place: value, |
| 1690 | key: loweredKey, |
| 1691 | }); |
| 1692 | } else if (propertyPath.isSpreadElement()) { |
| 1693 | const place = lowerExpressionToTemporary( |
| 1694 | builder, |
| 1695 | propertyPath.get('argument'), |
| 1696 | ); |
| 1697 | properties.push({ |
| 1698 | kind: 'Spread', |
| 1699 | place, |
| 1700 | }); |
| 1701 | } else if (propertyPath.isObjectMethod()) { |
| 1702 | if (propertyPath.node.kind !== 'method') { |
| 1703 | builder.recordError( |
| 1704 | new CompilerErrorDetail({ |
| 1705 | reason: `(BuildHIR::lowerExpression) Handle ${propertyPath.node.kind} functions in ObjectExpression`, |
| 1706 | category: ErrorCategory.Todo, |
| 1707 | loc: propertyPath.node.loc ?? null, |
| 1708 | suggestions: null, |
| 1709 | }), |
| 1710 | ); |
| 1711 | continue; |
| 1712 | } |
| 1713 | const method = lowerObjectMethod(builder, propertyPath); |
| 1714 | const place = lowerValueToTemporary(builder, method); |
| 1715 | const loweredKey = lowerObjectPropertyKey(builder, propertyPath); |
| 1716 | if (!loweredKey) { |
| 1717 | continue; |
| 1718 | } |
| 1719 | properties.push({ |
| 1720 | kind: 'ObjectProperty', |
| 1721 | type: 'method', |
| 1722 | place, |
| 1723 | key: loweredKey, |
| 1724 | }); |
| 1725 | } else { |
| 1726 | builder.recordError( |
| 1727 | new CompilerErrorDetail({ |
| 1728 | reason: `(BuildHIR::lowerExpression) Handle ${propertyPath.type} properties in ObjectExpression`, |
| 1729 | category: ErrorCategory.Todo, |
| 1730 | loc: propertyPath.node.loc ?? null, |
| 1731 | suggestions: null, |
| 1732 | }), |
| 1733 | ); |
| 1734 | continue; |
| 1735 | } |
| 1736 | } |
| 1737 | return { |
| 1738 | kind: 'ObjectExpression', |
| 1739 | properties, |
| 1740 | loc: exprLoc, |
| 1741 | }; |
| 1742 | } |
| 1743 | case 'ArrayExpression': { |
| 1744 | const expr = exprPath as NodePath<t.ArrayExpression>; |
| 1745 | let elements: ArrayExpression['elements'] = []; |
| 1746 | for (const element of expr.get('elements')) { |
| 1747 | if (element.node == null) { |
| 1748 | elements.push({ |
| 1749 | kind: 'Hole', |
| 1750 | }); |
| 1751 | continue; |
| 1752 | } else if (element.isExpression()) { |
| 1753 | elements.push(lowerExpressionToTemporary(builder, element)); |
| 1754 | } else if (element.isSpreadElement()) { |
| 1755 | const place = lowerExpressionToTemporary( |
| 1756 | builder, |
| 1757 | element.get('argument'), |
| 1758 | ); |
| 1759 | elements.push({kind: 'Spread', place}); |
| 1760 | } else { |
| 1761 | builder.recordError( |
| 1762 | new CompilerErrorDetail({ |
| 1763 | reason: `(BuildHIR::lowerExpression) Handle ${element.type} elements in ArrayExpression`, |
| 1764 | category: ErrorCategory.Todo, |
| 1765 | loc: element.node.loc ?? null, |
| 1766 | suggestions: null, |
| 1767 | }), |
| 1768 | ); |
| 1769 | continue; |
| 1770 | } |
| 1771 | } |
| 1772 | return { |
| 1773 | kind: 'ArrayExpression', |
| 1774 | elements, |
| 1775 | loc: exprLoc, |
| 1776 | }; |
| 1777 | } |
| 1778 | case 'NewExpression': { |
| 1779 | const expr = exprPath as NodePath<t.NewExpression>; |
| 1780 | const calleePath = expr.get('callee'); |
| 1781 | if (!calleePath.isExpression()) { |
| 1782 | builder.recordError( |
| 1783 | new CompilerErrorDetail({ |
| 1784 | reason: `Expected an expression as the \`new\` expression receiver (v8 intrinsics are not supported)`, |
| 1785 | description: `Got a \`${calleePath.node.type}\``, |
| 1786 | category: ErrorCategory.Syntax, |
| 1787 | loc: calleePath.node.loc ?? null, |
| 1788 | suggestions: null, |
| 1789 | }), |
| 1790 | ); |
| 1791 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 1792 | } |
| 1793 | const callee = lowerExpressionToTemporary(builder, calleePath); |
| 1794 | const args = lowerArguments(builder, expr.get('arguments')); |
| 1795 | |
| 1796 | return { |
| 1797 | kind: 'NewExpression', |
| 1798 | callee, |
| 1799 | args, |
| 1800 | loc: exprLoc, |
| 1801 | }; |
| 1802 | } |
| 1803 | case 'OptionalCallExpression': { |
| 1804 | const expr = exprPath as NodePath<t.OptionalCallExpression>; |
| 1805 | return lowerOptionalCallExpression(builder, expr, null); |
| 1806 | } |
| 1807 | case 'CallExpression': { |
| 1808 | const expr = exprPath as NodePath<t.CallExpression>; |
| 1809 | const calleePath = expr.get('callee'); |
| 1810 | if (!calleePath.isExpression()) { |
| 1811 | builder.recordError( |
| 1812 | new CompilerErrorDetail({ |
| 1813 | reason: `Expected Expression, got ${calleePath.type} in CallExpression (v8 intrinsics not supported). This error is likely caused by a bug in React Compiler. Please file an issue`, |
| 1814 | category: ErrorCategory.Todo, |
| 1815 | loc: calleePath.node.loc ?? null, |
| 1816 | suggestions: null, |
| 1817 | }), |
| 1818 | ); |
| 1819 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 1820 | } |
| 1821 | if (calleePath.isMemberExpression()) { |
| 1822 | const memberExpr = lowerMemberExpression(builder, calleePath); |
| 1823 | const propertyPlace = lowerValueToTemporary(builder, memberExpr.value); |
| 1824 | const args = lowerArguments(builder, expr.get('arguments')); |
| 1825 | return { |
| 1826 | kind: 'MethodCall', |
| 1827 | receiver: memberExpr.object, |
| 1828 | property: {...propertyPlace}, |
| 1829 | args, |
| 1830 | loc: exprLoc, |
| 1831 | }; |
| 1832 | } else { |
| 1833 | const callee = lowerExpressionToTemporary(builder, calleePath); |
| 1834 | const args = lowerArguments(builder, expr.get('arguments')); |
| 1835 | return { |
| 1836 | kind: 'CallExpression', |
| 1837 | callee, |
| 1838 | args, |
| 1839 | loc: exprLoc, |
| 1840 | }; |
| 1841 | } |
| 1842 | } |
| 1843 | case 'BinaryExpression': { |
| 1844 | const expr = exprPath as NodePath<t.BinaryExpression>; |
| 1845 | const leftPath = expr.get('left'); |
| 1846 | if (!leftPath.isExpression()) { |
| 1847 | builder.recordError( |
| 1848 | new CompilerErrorDetail({ |
| 1849 | reason: `(BuildHIR::lowerExpression) Expected Expression, got ${leftPath.type} lval in BinaryExpression`, |
| 1850 | category: ErrorCategory.Todo, |
| 1851 | loc: leftPath.node.loc ?? null, |
| 1852 | suggestions: null, |
| 1853 | }), |
| 1854 | ); |
| 1855 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 1856 | } |
| 1857 | const left = lowerExpressionToTemporary(builder, leftPath); |
| 1858 | const right = lowerExpressionToTemporary(builder, expr.get('right')); |
| 1859 | const operator = expr.node.operator; |
| 1860 | if (operator === '|>') { |
| 1861 | builder.recordError( |
| 1862 | new CompilerErrorDetail({ |
| 1863 | reason: `(BuildHIR::lowerExpression) Pipe operator not supported`, |
| 1864 | category: ErrorCategory.Todo, |
| 1865 | loc: leftPath.node.loc ?? null, |
| 1866 | suggestions: null, |
| 1867 | }), |
| 1868 | ); |
| 1869 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 1870 | } |
| 1871 | return { |
| 1872 | kind: 'BinaryExpression', |
| 1873 | operator, |
| 1874 | left, |
| 1875 | right, |
| 1876 | loc: exprLoc, |
| 1877 | }; |
| 1878 | } |
| 1879 | case 'SequenceExpression': { |
| 1880 | const expr = exprPath as NodePath<t.SequenceExpression>; |
| 1881 | const exprLoc = expr.node.loc ?? GeneratedSource; |
| 1882 | |
| 1883 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 1884 | const place = buildTemporaryPlace(builder, exprLoc); |
| 1885 | |
| 1886 | const sequenceBlock = builder.enter('sequence', _ => { |
| 1887 | let last: Place | null = null; |
| 1888 | for (const item of expr.get('expressions')) { |
| 1889 | last = lowerExpressionToTemporary(builder, item); |
| 1890 | } |
| 1891 | if (last === null) { |
| 1892 | builder.recordError( |
| 1893 | new CompilerErrorDetail({ |
| 1894 | reason: `Expected sequence expression to have at least one expression`, |
| 1895 | category: ErrorCategory.Syntax, |
| 1896 | loc: expr.node.loc ?? null, |
| 1897 | suggestions: null, |
| 1898 | }), |
| 1899 | ); |
| 1900 | } else { |
| 1901 | lowerValueToTemporary(builder, { |
| 1902 | kind: 'StoreLocal', |
| 1903 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 1904 | value: last, |
| 1905 | type: null, |
| 1906 | loc: exprLoc, |
| 1907 | }); |
| 1908 | } |
| 1909 | return { |
| 1910 | kind: 'goto', |
| 1911 | id: makeInstructionId(0), |
| 1912 | block: continuationBlock.id, |
| 1913 | loc: exprLoc, |
| 1914 | variant: GotoVariant.Break, |
| 1915 | }; |
| 1916 | }); |
| 1917 | |
| 1918 | builder.terminateWithContinuation( |
| 1919 | { |
| 1920 | kind: 'sequence', |
| 1921 | block: sequenceBlock, |
| 1922 | fallthrough: continuationBlock.id, |
| 1923 | id: makeInstructionId(0), |
| 1924 | loc: exprLoc, |
| 1925 | }, |
| 1926 | continuationBlock, |
| 1927 | ); |
| 1928 | return {kind: 'LoadLocal', place, loc: place.loc}; |
| 1929 | } |
| 1930 | case 'ConditionalExpression': { |
| 1931 | const expr = exprPath as NodePath<t.ConditionalExpression>; |
| 1932 | const exprLoc = expr.node.loc ?? GeneratedSource; |
| 1933 | |
| 1934 | // Block for code following the if |
| 1935 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 1936 | const testBlock = builder.reserve('value'); |
| 1937 | const place = buildTemporaryPlace(builder, exprLoc); |
| 1938 | |
| 1939 | // Block for the consequent (if the test is truthy) |
| 1940 | const consequentBlock = builder.enter('value', _blockId => { |
| 1941 | const consequentPath = expr.get('consequent'); |
| 1942 | const consequent = lowerExpressionToTemporary(builder, consequentPath); |
| 1943 | lowerValueToTemporary(builder, { |
| 1944 | kind: 'StoreLocal', |
| 1945 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 1946 | value: consequent, |
| 1947 | type: null, |
| 1948 | loc: exprLoc, |
| 1949 | }); |
| 1950 | return { |
| 1951 | kind: 'goto', |
| 1952 | block: continuationBlock.id, |
| 1953 | variant: GotoVariant.Break, |
| 1954 | id: makeInstructionId(0), |
| 1955 | loc: consequentPath.node.loc ?? GeneratedSource, |
| 1956 | }; |
| 1957 | }); |
| 1958 | // Block for the alternate (if the test is not truthy) |
| 1959 | const alternateBlock = builder.enter('value', _blockId => { |
| 1960 | const alternatePath = expr.get('alternate'); |
| 1961 | const alternate = lowerExpressionToTemporary(builder, alternatePath); |
| 1962 | lowerValueToTemporary(builder, { |
| 1963 | kind: 'StoreLocal', |
| 1964 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 1965 | value: alternate, |
| 1966 | type: null, |
| 1967 | loc: exprLoc, |
| 1968 | }); |
| 1969 | return { |
| 1970 | kind: 'goto', |
| 1971 | block: continuationBlock.id, |
| 1972 | variant: GotoVariant.Break, |
| 1973 | id: makeInstructionId(0), |
| 1974 | loc: alternatePath.node.loc ?? GeneratedSource, |
| 1975 | }; |
| 1976 | }); |
| 1977 | |
| 1978 | builder.terminateWithContinuation( |
| 1979 | { |
| 1980 | kind: 'ternary', |
| 1981 | fallthrough: continuationBlock.id, |
| 1982 | id: makeInstructionId(0), |
| 1983 | test: testBlock.id, |
| 1984 | loc: exprLoc, |
| 1985 | }, |
| 1986 | testBlock, |
| 1987 | ); |
| 1988 | const testPlace = lowerExpressionToTemporary(builder, expr.get('test')); |
| 1989 | builder.terminateWithContinuation( |
| 1990 | { |
| 1991 | kind: 'branch', |
| 1992 | test: {...testPlace}, |
| 1993 | consequent: consequentBlock, |
| 1994 | alternate: alternateBlock, |
| 1995 | fallthrough: continuationBlock.id, |
| 1996 | id: makeInstructionId(0), |
| 1997 | loc: exprLoc, |
| 1998 | }, |
| 1999 | continuationBlock, |
| 2000 | ); |
| 2001 | return {kind: 'LoadLocal', place, loc: place.loc}; |
| 2002 | } |
| 2003 | case 'LogicalExpression': { |
| 2004 | const expr = exprPath as NodePath<t.LogicalExpression>; |
| 2005 | const exprLoc = expr.node.loc ?? GeneratedSource; |
| 2006 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 2007 | const testBlock = builder.reserve('value'); |
| 2008 | const place = buildTemporaryPlace(builder, exprLoc); |
| 2009 | const leftPlace = buildTemporaryPlace( |
| 2010 | builder, |
| 2011 | expr.get('left').node.loc ?? GeneratedSource, |
| 2012 | ); |
| 2013 | const consequent = builder.enter('value', () => { |
| 2014 | lowerValueToTemporary(builder, { |
| 2015 | kind: 'StoreLocal', |
| 2016 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 2017 | value: {...leftPlace}, |
| 2018 | type: null, |
| 2019 | loc: leftPlace.loc, |
| 2020 | }); |
| 2021 | return { |
| 2022 | kind: 'goto', |
| 2023 | block: continuationBlock.id, |
| 2024 | variant: GotoVariant.Break, |
| 2025 | id: makeInstructionId(0), |
| 2026 | loc: leftPlace.loc, |
| 2027 | }; |
| 2028 | }); |
| 2029 | const alternate = builder.enter('value', () => { |
| 2030 | const right = lowerExpressionToTemporary(builder, expr.get('right')); |
| 2031 | lowerValueToTemporary(builder, { |
| 2032 | kind: 'StoreLocal', |
| 2033 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 2034 | value: {...right}, |
| 2035 | type: null, |
| 2036 | loc: right.loc, |
| 2037 | }); |
| 2038 | return { |
| 2039 | kind: 'goto', |
| 2040 | block: continuationBlock.id, |
| 2041 | variant: GotoVariant.Break, |
| 2042 | id: makeInstructionId(0), |
| 2043 | loc: right.loc, |
| 2044 | }; |
| 2045 | }); |
| 2046 | builder.terminateWithContinuation( |
| 2047 | { |
| 2048 | kind: 'logical', |
| 2049 | fallthrough: continuationBlock.id, |
| 2050 | id: makeInstructionId(0), |
| 2051 | test: testBlock.id, |
| 2052 | operator: expr.node.operator, |
| 2053 | loc: exprLoc, |
| 2054 | }, |
| 2055 | testBlock, |
| 2056 | ); |
| 2057 | const leftValue = lowerExpressionToTemporary(builder, expr.get('left')); |
| 2058 | builder.push({ |
| 2059 | id: makeInstructionId(0), |
| 2060 | lvalue: {...leftPlace}, |
| 2061 | value: { |
| 2062 | kind: 'LoadLocal', |
| 2063 | place: leftValue, |
| 2064 | loc: exprLoc, |
| 2065 | }, |
| 2066 | effects: null, |
| 2067 | loc: exprLoc, |
| 2068 | }); |
| 2069 | builder.terminateWithContinuation( |
| 2070 | { |
| 2071 | kind: 'branch', |
| 2072 | test: {...leftPlace}, |
| 2073 | consequent, |
| 2074 | alternate, |
| 2075 | fallthrough: continuationBlock.id, |
| 2076 | id: makeInstructionId(0), |
| 2077 | loc: exprLoc, |
| 2078 | }, |
| 2079 | continuationBlock, |
| 2080 | ); |
| 2081 | return {kind: 'LoadLocal', place, loc: place.loc}; |
| 2082 | } |
| 2083 | case 'AssignmentExpression': { |
| 2084 | const expr = exprPath as NodePath<t.AssignmentExpression>; |
| 2085 | const operator = expr.node.operator; |
| 2086 | |
| 2087 | if (operator === '=') { |
| 2088 | const left = expr.get('left'); |
| 2089 | if (left.isLVal()) { |
| 2090 | return lowerAssignment( |
| 2091 | builder, |
| 2092 | left.node.loc ?? GeneratedSource, |
| 2093 | InstructionKind.Reassign, |
| 2094 | left, |
| 2095 | lowerExpressionToTemporary(builder, expr.get('right')), |
| 2096 | left.isArrayPattern() || left.isObjectPattern() |
| 2097 | ? 'Destructure' |
| 2098 | : 'Assignment', |
| 2099 | ); |
| 2100 | } else { |
| 2101 | /** |
| 2102 | * OptionalMemberExpressions as the left side of an AssignmentExpression are Stage 1 and |
| 2103 | * not supported by React Compiler yet. |
| 2104 | */ |
| 2105 | builder.recordError( |
| 2106 | new CompilerErrorDetail({ |
| 2107 | reason: `(BuildHIR::lowerExpression) Unsupported syntax on the left side of an AssignmentExpression`, |
| 2108 | description: `Expected an LVal, got: ${left.type}`, |
| 2109 | category: ErrorCategory.Todo, |
| 2110 | loc: left.node.loc ?? null, |
| 2111 | suggestions: null, |
| 2112 | }), |
| 2113 | ); |
| 2114 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2115 | } |
| 2116 | } |
| 2117 | |
| 2118 | const operators: { |
| 2119 | [key: string]: Exclude<t.BinaryExpression['operator'], '|>'>; |
| 2120 | } = { |
| 2121 | '+=': '+', |
| 2122 | '-=': '-', |
| 2123 | '/=': '/', |
| 2124 | '%=': '%', |
| 2125 | '*=': '*', |
| 2126 | '**=': '**', |
| 2127 | '&=': '&', |
| 2128 | '|=': '|', |
| 2129 | '>>=': '>>', |
| 2130 | '>>>=': '>>>', |
| 2131 | '<<=': '<<', |
| 2132 | '^=': '^', |
| 2133 | }; |
| 2134 | const binaryOperator = operators[operator]; |
| 2135 | if (binaryOperator == null) { |
| 2136 | builder.recordError( |
| 2137 | new CompilerErrorDetail({ |
| 2138 | reason: `(BuildHIR::lowerExpression) Handle ${operator} operators in AssignmentExpression`, |
| 2139 | category: ErrorCategory.Todo, |
| 2140 | loc: expr.node.loc ?? null, |
| 2141 | suggestions: null, |
| 2142 | }), |
| 2143 | ); |
| 2144 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2145 | } |
| 2146 | const left = expr.get('left'); |
| 2147 | const leftNode = left.node; |
| 2148 | switch (leftNode.type) { |
| 2149 | case 'Identifier': { |
| 2150 | const leftExpr = left as NodePath<t.Identifier>; |
| 2151 | const leftPlace = lowerExpressionToTemporary(builder, leftExpr); |
| 2152 | const right = lowerExpressionToTemporary(builder, expr.get('right')); |
| 2153 | const binaryPlace = lowerValueToTemporary(builder, { |
| 2154 | kind: 'BinaryExpression', |
| 2155 | operator: binaryOperator, |
| 2156 | left: leftPlace, |
| 2157 | right, |
| 2158 | loc: exprLoc, |
| 2159 | }); |
| 2160 | const binding = builder.resolveIdentifier(leftExpr); |
| 2161 | if (binding.kind === 'Identifier') { |
| 2162 | const identifier = lowerIdentifier(builder, leftExpr); |
| 2163 | const kind = getStoreKind(builder, leftExpr); |
| 2164 | if (kind === 'StoreLocal') { |
| 2165 | lowerValueToTemporary(builder, { |
| 2166 | kind: 'StoreLocal', |
| 2167 | lvalue: { |
| 2168 | place: {...identifier}, |
| 2169 | kind: InstructionKind.Reassign, |
| 2170 | }, |
| 2171 | value: {...binaryPlace}, |
| 2172 | type: null, |
| 2173 | loc: exprLoc, |
| 2174 | }); |
| 2175 | return {kind: 'LoadLocal', place: identifier, loc: exprLoc}; |
| 2176 | } else { |
| 2177 | lowerValueToTemporary(builder, { |
| 2178 | kind: 'StoreContext', |
| 2179 | lvalue: { |
| 2180 | place: {...identifier}, |
| 2181 | kind: InstructionKind.Reassign, |
| 2182 | }, |
| 2183 | value: {...binaryPlace}, |
| 2184 | loc: exprLoc, |
| 2185 | }); |
| 2186 | return {kind: 'LoadContext', place: identifier, loc: exprLoc}; |
| 2187 | } |
| 2188 | } else { |
| 2189 | const temporary = lowerValueToTemporary(builder, { |
| 2190 | kind: 'StoreGlobal', |
| 2191 | name: leftExpr.node.name, |
| 2192 | value: {...binaryPlace}, |
| 2193 | loc: exprLoc, |
| 2194 | }); |
| 2195 | return {kind: 'LoadLocal', place: temporary, loc: temporary.loc}; |
| 2196 | } |
| 2197 | } |
| 2198 | case 'MemberExpression': { |
| 2199 | // a.b.c += <right> |
| 2200 | const leftExpr = left as NodePath<t.MemberExpression>; |
| 2201 | const {object, property, value} = lowerMemberExpression( |
| 2202 | builder, |
| 2203 | leftExpr, |
| 2204 | ); |
| 2205 | |
| 2206 | // Store the previous value to a temporary |
| 2207 | const previousValuePlace = lowerValueToTemporary(builder, value); |
| 2208 | // Store the new value to a temporary |
| 2209 | const newValuePlace = lowerValueToTemporary(builder, { |
| 2210 | kind: 'BinaryExpression', |
| 2211 | operator: binaryOperator, |
| 2212 | left: {...previousValuePlace}, |
| 2213 | right: lowerExpressionToTemporary(builder, expr.get('right')), |
| 2214 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2215 | }); |
| 2216 | |
| 2217 | // Save the result back to the property |
| 2218 | if (typeof property === 'string' || typeof property === 'number') { |
| 2219 | return { |
| 2220 | kind: 'PropertyStore', |
| 2221 | object: {...object}, |
| 2222 | property: makePropertyLiteral(property), |
| 2223 | value: {...newValuePlace}, |
| 2224 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2225 | }; |
| 2226 | } else { |
| 2227 | return { |
| 2228 | kind: 'ComputedStore', |
| 2229 | object: {...object}, |
| 2230 | property: {...property}, |
| 2231 | value: {...newValuePlace}, |
| 2232 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2233 | }; |
| 2234 | } |
| 2235 | } |
| 2236 | default: { |
| 2237 | builder.recordError( |
| 2238 | new CompilerErrorDetail({ |
| 2239 | reason: `(BuildHIR::lowerExpression) Expected Identifier or MemberExpression, got ${expr.type} lval in AssignmentExpression`, |
| 2240 | category: ErrorCategory.Todo, |
| 2241 | loc: expr.node.loc ?? null, |
| 2242 | suggestions: null, |
| 2243 | }), |
| 2244 | ); |
| 2245 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2246 | } |
| 2247 | } |
| 2248 | } |
| 2249 | case 'OptionalMemberExpression': { |
| 2250 | const expr = exprPath as NodePath<t.OptionalMemberExpression>; |
| 2251 | const {value} = lowerOptionalMemberExpression(builder, expr, null); |
| 2252 | return {kind: 'LoadLocal', place: value, loc: value.loc}; |
| 2253 | } |
| 2254 | case 'MemberExpression': { |
| 2255 | const expr = exprPath as NodePath< |
| 2256 | t.MemberExpression | t.OptionalMemberExpression |
| 2257 | >; |
| 2258 | const {value} = lowerMemberExpression(builder, expr); |
| 2259 | const place = lowerValueToTemporary(builder, value); |
| 2260 | return {kind: 'LoadLocal', place, loc: place.loc}; |
| 2261 | } |
| 2262 | case 'JSXElement': { |
| 2263 | const expr = exprPath as NodePath<t.JSXElement>; |
| 2264 | const opening = expr.get('openingElement'); |
| 2265 | const openingLoc = opening.node.loc ?? GeneratedSource; |
| 2266 | const tag = lowerJsxElementName(builder, opening.get('name')); |
| 2267 | const props: Array<JsxAttribute> = []; |
| 2268 | for (const attribute of opening.get('attributes')) { |
| 2269 | if (attribute.isJSXSpreadAttribute()) { |
| 2270 | const argument = lowerExpressionToTemporary( |
| 2271 | builder, |
| 2272 | attribute.get('argument'), |
| 2273 | ); |
| 2274 | props.push({kind: 'JsxSpreadAttribute', argument}); |
| 2275 | continue; |
| 2276 | } |
| 2277 | if (!attribute.isJSXAttribute()) { |
| 2278 | builder.recordError( |
| 2279 | new CompilerErrorDetail({ |
| 2280 | reason: `(BuildHIR::lowerExpression) Handle ${attribute.type} attributes in JSXElement`, |
| 2281 | category: ErrorCategory.Todo, |
| 2282 | loc: attribute.node.loc ?? null, |
| 2283 | suggestions: null, |
| 2284 | }), |
| 2285 | ); |
| 2286 | continue; |
| 2287 | } |
| 2288 | const namePath = attribute.get('name'); |
| 2289 | let propName; |
| 2290 | if (namePath.isJSXIdentifier()) { |
| 2291 | propName = namePath.node.name; |
| 2292 | if (propName.indexOf(':') !== -1) { |
| 2293 | builder.recordError( |
| 2294 | new CompilerErrorDetail({ |
| 2295 | reason: `(BuildHIR::lowerExpression) Unexpected colon in attribute name \`${propName}\``, |
| 2296 | category: ErrorCategory.Todo, |
| 2297 | loc: namePath.node.loc ?? null, |
| 2298 | suggestions: null, |
| 2299 | }), |
| 2300 | ); |
| 2301 | } |
| 2302 | } else { |
| 2303 | CompilerError.invariant(namePath.isJSXNamespacedName(), { |
| 2304 | reason: 'Refinement', |
| 2305 | loc: namePath.node.loc ?? GeneratedSource, |
| 2306 | }); |
| 2307 | const namespace = namePath.node.namespace.name; |
| 2308 | const name = namePath.node.name.name; |
| 2309 | propName = `${namespace}:${name}`; |
| 2310 | } |
| 2311 | const valueExpr = attribute.get('value'); |
| 2312 | let value; |
| 2313 | if (valueExpr.isJSXElement() || valueExpr.isStringLiteral()) { |
| 2314 | value = lowerExpressionToTemporary(builder, valueExpr); |
| 2315 | } else if (valueExpr.type == null) { |
| 2316 | value = lowerValueToTemporary(builder, { |
| 2317 | kind: 'Primitive', |
| 2318 | value: true, |
| 2319 | loc: attribute.node.loc ?? GeneratedSource, |
| 2320 | }); |
| 2321 | } else { |
| 2322 | if (!valueExpr.isJSXExpressionContainer()) { |
| 2323 | builder.recordError( |
| 2324 | new CompilerErrorDetail({ |
| 2325 | reason: `(BuildHIR::lowerExpression) Handle ${valueExpr.type} attribute values in JSXElement`, |
| 2326 | category: ErrorCategory.Todo, |
| 2327 | loc: valueExpr.node?.loc ?? null, |
| 2328 | suggestions: null, |
| 2329 | }), |
| 2330 | ); |
| 2331 | continue; |
| 2332 | } |
| 2333 | const expression = valueExpr.get('expression'); |
| 2334 | if (!expression.isExpression()) { |
| 2335 | builder.recordError( |
| 2336 | new CompilerErrorDetail({ |
| 2337 | reason: `(BuildHIR::lowerExpression) Handle ${expression.type} expressions in JSXExpressionContainer within JSXElement`, |
| 2338 | category: ErrorCategory.Todo, |
| 2339 | loc: valueExpr.node.loc ?? null, |
| 2340 | suggestions: null, |
| 2341 | }), |
| 2342 | ); |
| 2343 | continue; |
| 2344 | } |
| 2345 | value = lowerExpressionToTemporary(builder, expression); |
| 2346 | } |
| 2347 | props.push({kind: 'JsxAttribute', name: propName, place: value}); |
| 2348 | } |
| 2349 | |
| 2350 | const isFbt = |
| 2351 | tag.kind === 'BuiltinTag' && (tag.name === 'fbt' || tag.name === 'fbs'); |
| 2352 | if (isFbt) { |
| 2353 | const tagName = tag.name; |
| 2354 | const openingIdentifier = opening.get('name'); |
| 2355 | const tagIdentifier = openingIdentifier.isJSXIdentifier() |
| 2356 | ? builder.resolveIdentifier(openingIdentifier) |
| 2357 | : null; |
| 2358 | if (tagIdentifier != null) { |
| 2359 | // This is already checked in builder.resolveIdentifier |
| 2360 | CompilerError.invariant(tagIdentifier.kind !== 'Identifier', { |
| 2361 | reason: `<${tagName}> tags should be module-level imports`, |
| 2362 | loc: openingIdentifier.node.loc ?? GeneratedSource, |
| 2363 | }); |
| 2364 | } |
| 2365 | // see `error.todo-multiple-fbt-plural` fixture for explanation |
| 2366 | const fbtLocations = { |
| 2367 | enum: new Array<SourceLocation>(), |
| 2368 | plural: new Array<SourceLocation>(), |
| 2369 | pronoun: new Array<SourceLocation>(), |
| 2370 | }; |
| 2371 | expr.traverse({ |
| 2372 | JSXClosingElement(path) { |
| 2373 | path.skip(); |
| 2374 | }, |
| 2375 | JSXNamespacedName(path) { |
| 2376 | if (path.node.namespace.name === tagName) { |
| 2377 | switch (path.node.name.name) { |
| 2378 | case 'enum': |
| 2379 | fbtLocations.enum.push(path.node.loc ?? GeneratedSource); |
| 2380 | break; |
| 2381 | case 'plural': |
| 2382 | fbtLocations.plural.push(path.node.loc ?? GeneratedSource); |
| 2383 | break; |
| 2384 | case 'pronoun': |
| 2385 | fbtLocations.pronoun.push(path.node.loc ?? GeneratedSource); |
| 2386 | break; |
| 2387 | } |
| 2388 | } |
| 2389 | }, |
| 2390 | }); |
| 2391 | for (const [name, locations] of Object.entries(fbtLocations)) { |
| 2392 | if (locations.length > 1) { |
| 2393 | builder.recordError( |
| 2394 | new CompilerDiagnostic({ |
| 2395 | category: ErrorCategory.Todo, |
| 2396 | reason: 'Support duplicate fbt tags', |
| 2397 | description: `Support \`<${tagName}>\` tags with multiple \`<${tagName}:${name}>\` values`, |
| 2398 | details: locations.map(loc => { |
| 2399 | return { |
| 2400 | kind: 'error' as const, |
| 2401 | message: `Multiple \`<${tagName}:${name}>\` tags found`, |
| 2402 | loc, |
| 2403 | }; |
| 2404 | }), |
| 2405 | }), |
| 2406 | ); |
| 2407 | } |
| 2408 | } |
| 2409 | } |
| 2410 | |
| 2411 | /** |
| 2412 | * Increment fbt counter before traversing into children, as whitespace |
| 2413 | * in jsx text is handled differently for fbt subtrees. |
| 2414 | */ |
| 2415 | isFbt && builder.fbtDepth++; |
| 2416 | const children: Array<Place> = expr |
| 2417 | .get('children') |
| 2418 | .map(child => lowerJsxElement(builder, child)) |
| 2419 | .filter(notNull); |
| 2420 | isFbt && builder.fbtDepth--; |
| 2421 | |
| 2422 | return { |
| 2423 | kind: 'JsxExpression', |
| 2424 | tag, |
| 2425 | props, |
| 2426 | children: children.length === 0 ? null : children, |
| 2427 | loc: exprLoc, |
| 2428 | openingLoc: openingLoc, |
| 2429 | closingLoc: expr.get('closingElement').node?.loc ?? GeneratedSource, |
| 2430 | }; |
| 2431 | } |
| 2432 | case 'JSXFragment': { |
| 2433 | const expr = exprPath as NodePath<t.JSXFragment>; |
| 2434 | const children: Array<Place> = expr |
| 2435 | .get('children') |
| 2436 | .map(child => lowerJsxElement(builder, child)) |
| 2437 | .filter(notNull); |
| 2438 | return { |
| 2439 | kind: 'JsxFragment', |
| 2440 | children, |
| 2441 | loc: exprLoc, |
| 2442 | }; |
| 2443 | } |
| 2444 | case 'ArrowFunctionExpression': |
| 2445 | case 'FunctionExpression': { |
| 2446 | const expr = exprPath as NodePath< |
| 2447 | t.FunctionExpression | t.ArrowFunctionExpression |
| 2448 | >; |
| 2449 | return lowerFunctionToValue(builder, expr); |
| 2450 | } |
| 2451 | case 'TaggedTemplateExpression': { |
| 2452 | const expr = exprPath as NodePath<t.TaggedTemplateExpression>; |
| 2453 | if (expr.get('quasi').get('expressions').length !== 0) { |
| 2454 | builder.recordError( |
| 2455 | new CompilerErrorDetail({ |
| 2456 | reason: |
| 2457 | '(BuildHIR::lowerExpression) Handle tagged template with interpolations', |
| 2458 | category: ErrorCategory.Todo, |
| 2459 | loc: exprPath.node.loc ?? null, |
| 2460 | suggestions: null, |
| 2461 | }), |
| 2462 | ); |
| 2463 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2464 | } |
| 2465 | CompilerError.invariant(expr.get('quasi').get('quasis').length == 1, { |
| 2466 | reason: |
| 2467 | "there should be only one quasi as we don't support interpolations yet", |
| 2468 | loc: expr.node.loc ?? GeneratedSource, |
| 2469 | }); |
| 2470 | const value = expr.get('quasi').get('quasis').at(0)!.node.value; |
| 2471 | if (value.raw !== value.cooked) { |
| 2472 | builder.recordError( |
| 2473 | new CompilerErrorDetail({ |
| 2474 | reason: |
| 2475 | '(BuildHIR::lowerExpression) Handle tagged template where cooked value is different from raw value', |
| 2476 | category: ErrorCategory.Todo, |
| 2477 | loc: exprPath.node.loc ?? null, |
| 2478 | suggestions: null, |
| 2479 | }), |
| 2480 | ); |
| 2481 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2482 | } |
| 2483 | |
| 2484 | return { |
| 2485 | kind: 'TaggedTemplateExpression', |
| 2486 | tag: lowerExpressionToTemporary(builder, expr.get('tag')), |
| 2487 | value, |
| 2488 | loc: exprLoc, |
| 2489 | }; |
| 2490 | } |
| 2491 | case 'TemplateLiteral': { |
| 2492 | const expr = exprPath as NodePath<t.TemplateLiteral>; |
| 2493 | const subexprs = expr.get('expressions'); |
| 2494 | const quasis = expr.get('quasis'); |
| 2495 | |
| 2496 | if (subexprs.length !== quasis.length - 1) { |
| 2497 | builder.recordError( |
| 2498 | new CompilerErrorDetail({ |
| 2499 | reason: `Unexpected quasi and subexpression lengths in template literal`, |
| 2500 | category: ErrorCategory.Syntax, |
| 2501 | loc: exprPath.node.loc ?? null, |
| 2502 | suggestions: null, |
| 2503 | }), |
| 2504 | ); |
| 2505 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2506 | } |
| 2507 | |
| 2508 | if (subexprs.some(e => !e.isExpression())) { |
| 2509 | builder.recordError( |
| 2510 | new CompilerErrorDetail({ |
| 2511 | reason: `(BuildHIR::lowerAssignment) Handle TSType in TemplateLiteral.`, |
| 2512 | category: ErrorCategory.Todo, |
| 2513 | loc: exprPath.node.loc ?? null, |
| 2514 | suggestions: null, |
| 2515 | }), |
| 2516 | ); |
| 2517 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2518 | } |
| 2519 | |
| 2520 | const subexprPlaces = subexprs.map(e => |
| 2521 | lowerExpressionToTemporary(builder, e as NodePath<t.Expression>), |
| 2522 | ); |
| 2523 | |
| 2524 | return { |
| 2525 | kind: 'TemplateLiteral', |
| 2526 | subexprs: subexprPlaces, |
| 2527 | quasis: expr.get('quasis').map(q => q.node.value), |
| 2528 | loc: exprLoc, |
| 2529 | }; |
| 2530 | } |
| 2531 | case 'UnaryExpression': { |
| 2532 | let expr = exprPath as NodePath<t.UnaryExpression>; |
| 2533 | if (expr.node.operator === 'delete') { |
| 2534 | const argument = expr.get('argument'); |
| 2535 | if (argument.isMemberExpression()) { |
| 2536 | const {object, property} = lowerMemberExpression(builder, argument); |
| 2537 | if (typeof property === 'string' || typeof property === 'number') { |
| 2538 | return { |
| 2539 | kind: 'PropertyDelete', |
| 2540 | object, |
| 2541 | property: makePropertyLiteral(property), |
| 2542 | loc: exprLoc, |
| 2543 | }; |
| 2544 | } else { |
| 2545 | return { |
| 2546 | kind: 'ComputedDelete', |
| 2547 | object, |
| 2548 | property, |
| 2549 | loc: exprLoc, |
| 2550 | }; |
| 2551 | } |
| 2552 | } else { |
| 2553 | builder.recordError( |
| 2554 | new CompilerErrorDetail({ |
| 2555 | reason: `Only object properties can be deleted`, |
| 2556 | category: ErrorCategory.Syntax, |
| 2557 | loc: expr.node.loc ?? null, |
| 2558 | suggestions: [ |
| 2559 | { |
| 2560 | description: 'Remove this line', |
| 2561 | range: [expr.node.start!, expr.node.end!], |
| 2562 | op: CompilerSuggestionOperation.Remove, |
| 2563 | }, |
| 2564 | ], |
| 2565 | }), |
| 2566 | ); |
| 2567 | return {kind: 'UnsupportedNode', node: expr.node, loc: exprLoc}; |
| 2568 | } |
| 2569 | } else if (expr.node.operator === 'throw') { |
| 2570 | builder.recordError( |
| 2571 | new CompilerErrorDetail({ |
| 2572 | reason: `Throw expressions are not supported`, |
| 2573 | category: ErrorCategory.Syntax, |
| 2574 | loc: expr.node.loc ?? null, |
| 2575 | suggestions: [ |
| 2576 | { |
| 2577 | description: 'Remove this line', |
| 2578 | range: [expr.node.start!, expr.node.end!], |
| 2579 | op: CompilerSuggestionOperation.Remove, |
| 2580 | }, |
| 2581 | ], |
| 2582 | }), |
| 2583 | ); |
| 2584 | return {kind: 'UnsupportedNode', node: expr.node, loc: exprLoc}; |
| 2585 | } else { |
| 2586 | return { |
| 2587 | kind: 'UnaryExpression', |
| 2588 | operator: expr.node.operator, |
| 2589 | value: lowerExpressionToTemporary(builder, expr.get('argument')), |
| 2590 | loc: exprLoc, |
| 2591 | }; |
| 2592 | } |
| 2593 | } |
| 2594 | case 'AwaitExpression': { |
| 2595 | let expr = exprPath as NodePath<t.AwaitExpression>; |
| 2596 | return { |
| 2597 | kind: 'Await', |
| 2598 | value: lowerExpressionToTemporary(builder, expr.get('argument')), |
| 2599 | loc: exprLoc, |
| 2600 | }; |
| 2601 | } |
| 2602 | case 'TypeCastExpression': { |
| 2603 | let expr = exprPath as NodePath<t.TypeCastExpression>; |
| 2604 | const typeAnnotation = expr.get('typeAnnotation').get('typeAnnotation'); |
| 2605 | return { |
| 2606 | kind: 'TypeCastExpression', |
| 2607 | value: lowerExpressionToTemporary(builder, expr.get('expression')), |
| 2608 | typeAnnotation: typeAnnotation.node, |
| 2609 | typeAnnotationKind: 'cast', |
| 2610 | type: lowerType(typeAnnotation.node), |
| 2611 | loc: exprLoc, |
| 2612 | }; |
| 2613 | } |
| 2614 | case 'TSSatisfiesExpression': { |
| 2615 | let expr = exprPath as NodePath<t.TSSatisfiesExpression>; |
| 2616 | const typeAnnotation = expr.get('typeAnnotation'); |
| 2617 | return { |
| 2618 | kind: 'TypeCastExpression', |
| 2619 | value: lowerExpressionToTemporary(builder, expr.get('expression')), |
| 2620 | typeAnnotation: typeAnnotation.node, |
| 2621 | typeAnnotationKind: 'satisfies', |
| 2622 | type: lowerType(typeAnnotation.node), |
| 2623 | loc: exprLoc, |
| 2624 | }; |
| 2625 | } |
| 2626 | case 'TSAsExpression': { |
| 2627 | let expr = exprPath as NodePath<t.TSAsExpression>; |
| 2628 | const typeAnnotation = expr.get('typeAnnotation'); |
| 2629 | return { |
| 2630 | kind: 'TypeCastExpression', |
| 2631 | value: lowerExpressionToTemporary(builder, expr.get('expression')), |
| 2632 | typeAnnotation: typeAnnotation.node, |
| 2633 | typeAnnotationKind: 'as', |
| 2634 | type: lowerType(typeAnnotation.node), |
| 2635 | loc: exprLoc, |
| 2636 | }; |
| 2637 | } |
| 2638 | case 'UpdateExpression': { |
| 2639 | let expr = exprPath as NodePath<t.UpdateExpression>; |
| 2640 | const argument = expr.get('argument'); |
| 2641 | if (argument.isMemberExpression()) { |
| 2642 | const binaryOperator = expr.node.operator === '++' ? '+' : '-'; |
| 2643 | const leftExpr = argument as NodePath<t.MemberExpression>; |
| 2644 | const {object, property, value} = lowerMemberExpression( |
| 2645 | builder, |
| 2646 | leftExpr, |
| 2647 | ); |
| 2648 | |
| 2649 | // Store the previous value to a temporary |
| 2650 | const previousValuePlace = lowerValueToTemporary(builder, value); |
| 2651 | // Store the new value to a temporary |
| 2652 | const updatedValue = lowerValueToTemporary(builder, { |
| 2653 | kind: 'BinaryExpression', |
| 2654 | operator: binaryOperator, |
| 2655 | left: {...previousValuePlace}, |
| 2656 | right: lowerValueToTemporary(builder, { |
| 2657 | kind: 'Primitive', |
| 2658 | value: 1, |
| 2659 | loc: GeneratedSource, |
| 2660 | }), |
| 2661 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2662 | }); |
| 2663 | |
| 2664 | // Save the result back to the property |
| 2665 | let newValuePlace; |
| 2666 | if (typeof property === 'string' || typeof property === 'number') { |
| 2667 | newValuePlace = lowerValueToTemporary(builder, { |
| 2668 | kind: 'PropertyStore', |
| 2669 | object: {...object}, |
| 2670 | property: makePropertyLiteral(property), |
| 2671 | value: {...updatedValue}, |
| 2672 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2673 | }); |
| 2674 | } else { |
| 2675 | newValuePlace = lowerValueToTemporary(builder, { |
| 2676 | kind: 'ComputedStore', |
| 2677 | object: {...object}, |
| 2678 | property: {...property}, |
| 2679 | value: {...updatedValue}, |
| 2680 | loc: leftExpr.node.loc ?? GeneratedSource, |
| 2681 | }); |
| 2682 | } |
| 2683 | |
| 2684 | return { |
| 2685 | kind: 'LoadLocal', |
| 2686 | place: expr.node.prefix |
| 2687 | ? {...newValuePlace} |
| 2688 | : {...previousValuePlace}, |
| 2689 | loc: exprLoc, |
| 2690 | }; |
| 2691 | } |
| 2692 | if (!argument.isIdentifier()) { |
| 2693 | builder.recordError( |
| 2694 | new CompilerErrorDetail({ |
| 2695 | reason: `(BuildHIR::lowerExpression) Handle UpdateExpression with ${argument.type} argument`, |
| 2696 | category: ErrorCategory.Todo, |
| 2697 | loc: exprPath.node.loc ?? null, |
| 2698 | suggestions: null, |
| 2699 | }), |
| 2700 | ); |
| 2701 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2702 | } else if (builder.isContextIdentifier(argument)) { |
| 2703 | builder.recordError( |
| 2704 | new CompilerErrorDetail({ |
| 2705 | reason: `(BuildHIR::lowerExpression) Handle UpdateExpression to variables captured within lambdas.`, |
| 2706 | category: ErrorCategory.Todo, |
| 2707 | loc: exprPath.node.loc ?? null, |
| 2708 | suggestions: null, |
| 2709 | }), |
| 2710 | ); |
| 2711 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2712 | } |
| 2713 | const lvalue = lowerIdentifierForAssignment( |
| 2714 | builder, |
| 2715 | argument.node.loc ?? GeneratedSource, |
| 2716 | InstructionKind.Reassign, |
| 2717 | argument, |
| 2718 | ); |
| 2719 | if (lvalue === null) { |
| 2720 | /* |
| 2721 | * lowerIdentifierForAssignment should have already reported an error if it returned null, |
| 2722 | * we check here just in case |
| 2723 | */ |
| 2724 | if (!builder.environment.hasErrors()) { |
| 2725 | builder.recordError( |
| 2726 | new CompilerErrorDetail({ |
| 2727 | reason: `(BuildHIR::lowerExpression) Found an invalid UpdateExpression without a previously reported error`, |
| 2728 | category: ErrorCategory.Invariant, |
| 2729 | loc: exprLoc, |
| 2730 | suggestions: null, |
| 2731 | }), |
| 2732 | ); |
| 2733 | } |
| 2734 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2735 | } else if (lvalue.kind === 'Global') { |
| 2736 | builder.recordError( |
| 2737 | new CompilerErrorDetail({ |
| 2738 | reason: `(BuildHIR::lowerExpression) Support UpdateExpression where argument is a global`, |
| 2739 | category: ErrorCategory.Todo, |
| 2740 | loc: exprLoc, |
| 2741 | suggestions: null, |
| 2742 | }), |
| 2743 | ); |
| 2744 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2745 | } |
| 2746 | const value = lowerIdentifier(builder, argument); |
| 2747 | if (expr.node.prefix) { |
| 2748 | return { |
| 2749 | kind: 'PrefixUpdate', |
| 2750 | lvalue, |
| 2751 | operation: expr.node.operator, |
| 2752 | value, |
| 2753 | loc: exprLoc, |
| 2754 | }; |
| 2755 | } else { |
| 2756 | return { |
| 2757 | kind: 'PostfixUpdate', |
| 2758 | lvalue, |
| 2759 | operation: expr.node.operator, |
| 2760 | value, |
| 2761 | loc: exprLoc, |
| 2762 | }; |
| 2763 | } |
| 2764 | } |
| 2765 | case 'RegExpLiteral': { |
| 2766 | let expr = exprPath as NodePath<t.RegExpLiteral>; |
| 2767 | return { |
| 2768 | kind: 'RegExpLiteral', |
| 2769 | pattern: expr.node.pattern, |
| 2770 | flags: expr.node.flags, |
| 2771 | loc: expr.node.loc ?? GeneratedSource, |
| 2772 | }; |
| 2773 | } |
| 2774 | case 'TSInstantiationExpression': |
| 2775 | case 'TSNonNullExpression': { |
| 2776 | let expr = exprPath as NodePath<t.TSNonNullExpression>; |
| 2777 | return lowerExpression(builder, expr.get('expression')); |
| 2778 | } |
| 2779 | case 'MetaProperty': { |
| 2780 | let expr = exprPath as NodePath<t.MetaProperty>; |
| 2781 | if ( |
| 2782 | expr.node.meta.name === 'import' && |
| 2783 | expr.node.property.name === 'meta' |
| 2784 | ) { |
| 2785 | return { |
| 2786 | kind: 'MetaProperty', |
| 2787 | meta: expr.node.meta.name, |
| 2788 | property: expr.node.property.name, |
| 2789 | loc: expr.node.loc ?? GeneratedSource, |
| 2790 | }; |
| 2791 | } |
| 2792 | |
| 2793 | builder.recordError( |
| 2794 | new CompilerErrorDetail({ |
| 2795 | reason: `(BuildHIR::lowerExpression) Handle MetaProperty expressions other than import.meta`, |
| 2796 | category: ErrorCategory.Todo, |
| 2797 | loc: exprPath.node.loc ?? null, |
| 2798 | suggestions: null, |
| 2799 | }), |
| 2800 | ); |
| 2801 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2802 | } |
| 2803 | default: { |
| 2804 | builder.recordError( |
| 2805 | new CompilerErrorDetail({ |
| 2806 | reason: `(BuildHIR::lowerExpression) Handle ${exprPath.type} expressions`, |
| 2807 | category: ErrorCategory.Todo, |
| 2808 | loc: exprPath.node.loc ?? null, |
| 2809 | suggestions: null, |
| 2810 | }), |
| 2811 | ); |
| 2812 | return {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}; |
| 2813 | } |
| 2814 | } |
| 2815 | } |
| 2816 | |
| 2817 | function lowerOptionalMemberExpression( |
| 2818 | builder: HIRBuilder, |
| 2819 | expr: NodePath<t.OptionalMemberExpression>, |
| 2820 | parentAlternate: BlockId | null, |
| 2821 | ): {object: Place; value: Place} { |
| 2822 | const optional = expr.node.optional; |
| 2823 | const loc = expr.node.loc ?? GeneratedSource; |
| 2824 | const place = buildTemporaryPlace(builder, loc); |
| 2825 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 2826 | const consequent = builder.reserve('value'); |
| 2827 | |
| 2828 | /* |
| 2829 | * block to evaluate if the callee is null/undefined, this sets the result of the call to undefined. |
| 2830 | * note that we only create an alternate when first entering an optional subtree of the ast: if this |
| 2831 | * is a child of an optional node, we use the alterate created by the parent. |
| 2832 | */ |
| 2833 | const alternate = |
| 2834 | parentAlternate !== null |
| 2835 | ? parentAlternate |
| 2836 | : builder.enter('value', () => { |
| 2837 | const temp = lowerValueToTemporary(builder, { |
| 2838 | kind: 'Primitive', |
| 2839 | value: undefined, |
| 2840 | loc, |
| 2841 | }); |
| 2842 | lowerValueToTemporary(builder, { |
| 2843 | kind: 'StoreLocal', |
| 2844 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 2845 | value: {...temp}, |
| 2846 | type: null, |
| 2847 | loc, |
| 2848 | }); |
| 2849 | return { |
| 2850 | kind: 'goto', |
| 2851 | variant: GotoVariant.Break, |
| 2852 | block: continuationBlock.id, |
| 2853 | id: makeInstructionId(0), |
| 2854 | loc, |
| 2855 | }; |
| 2856 | }); |
| 2857 | |
| 2858 | let object: Place | null = null; |
| 2859 | const testBlock = builder.enter('value', () => { |
| 2860 | const objectPath = expr.get('object'); |
| 2861 | if (objectPath.isOptionalMemberExpression()) { |
| 2862 | const {value} = lowerOptionalMemberExpression( |
| 2863 | builder, |
| 2864 | objectPath, |
| 2865 | alternate, |
| 2866 | ); |
| 2867 | object = value; |
| 2868 | } else if (objectPath.isOptionalCallExpression()) { |
| 2869 | const value = lowerOptionalCallExpression(builder, objectPath, alternate); |
| 2870 | object = lowerValueToTemporary(builder, value); |
| 2871 | } else { |
| 2872 | object = lowerExpressionToTemporary(builder, objectPath); |
| 2873 | } |
| 2874 | return { |
| 2875 | kind: 'branch', |
| 2876 | test: {...object}, |
| 2877 | consequent: consequent.id, |
| 2878 | alternate, |
| 2879 | fallthrough: continuationBlock.id, |
| 2880 | id: makeInstructionId(0), |
| 2881 | loc, |
| 2882 | }; |
| 2883 | }); |
| 2884 | CompilerError.invariant(object !== null, { |
| 2885 | reason: 'Satisfy type checker', |
| 2886 | loc: GeneratedSource, |
| 2887 | }); |
| 2888 | |
| 2889 | /* |
| 2890 | * block to evaluate if the callee is non-null/undefined. arguments are lowered in this block to preserve |
| 2891 | * the semantic of conditional evaluation depending on the callee |
| 2892 | */ |
| 2893 | builder.enterReserved(consequent, () => { |
| 2894 | const {value} = lowerMemberExpression(builder, expr, object); |
| 2895 | const temp = lowerValueToTemporary(builder, value); |
| 2896 | lowerValueToTemporary(builder, { |
| 2897 | kind: 'StoreLocal', |
| 2898 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 2899 | value: {...temp}, |
| 2900 | type: null, |
| 2901 | loc, |
| 2902 | }); |
| 2903 | return { |
| 2904 | kind: 'goto', |
| 2905 | variant: GotoVariant.Break, |
| 2906 | block: continuationBlock.id, |
| 2907 | id: makeInstructionId(0), |
| 2908 | loc, |
| 2909 | }; |
| 2910 | }); |
| 2911 | |
| 2912 | builder.terminateWithContinuation( |
| 2913 | { |
| 2914 | kind: 'optional', |
| 2915 | optional, |
| 2916 | test: testBlock, |
| 2917 | fallthrough: continuationBlock.id, |
| 2918 | id: makeInstructionId(0), |
| 2919 | loc, |
| 2920 | }, |
| 2921 | continuationBlock, |
| 2922 | ); |
| 2923 | |
| 2924 | return {object, value: place}; |
| 2925 | } |
| 2926 | |
| 2927 | function lowerOptionalCallExpression( |
| 2928 | builder: HIRBuilder, |
| 2929 | expr: NodePath<t.OptionalCallExpression>, |
| 2930 | parentAlternate: BlockId | null, |
| 2931 | ): InstructionValue { |
| 2932 | const optional = expr.node.optional; |
| 2933 | const calleePath = expr.get('callee'); |
| 2934 | const loc = expr.node.loc ?? GeneratedSource; |
| 2935 | const place = buildTemporaryPlace(builder, loc); |
| 2936 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 2937 | const consequent = builder.reserve('value'); |
| 2938 | |
| 2939 | /* |
| 2940 | * block to evaluate if the callee is null/undefined, this sets the result of the call to undefined. |
| 2941 | * note that we only create an alternate when first entering an optional subtree of the ast: if this |
| 2942 | * is a child of an optional node, we use the alterate created by the parent. |
| 2943 | */ |
| 2944 | const alternate = |
| 2945 | parentAlternate !== null |
| 2946 | ? parentAlternate |
| 2947 | : builder.enter('value', () => { |
| 2948 | const temp = lowerValueToTemporary(builder, { |
| 2949 | kind: 'Primitive', |
| 2950 | value: undefined, |
| 2951 | loc, |
| 2952 | }); |
| 2953 | lowerValueToTemporary(builder, { |
| 2954 | kind: 'StoreLocal', |
| 2955 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 2956 | value: {...temp}, |
| 2957 | type: null, |
| 2958 | loc, |
| 2959 | }); |
| 2960 | return { |
| 2961 | kind: 'goto', |
| 2962 | variant: GotoVariant.Break, |
| 2963 | block: continuationBlock.id, |
| 2964 | id: makeInstructionId(0), |
| 2965 | loc, |
| 2966 | }; |
| 2967 | }); |
| 2968 | |
| 2969 | /* |
| 2970 | * Lower the callee within the test block to represent the fact that the code for the callee is |
| 2971 | * scoped within the optional |
| 2972 | */ |
| 2973 | let callee: |
| 2974 | | {kind: 'CallExpression'; callee: Place} |
| 2975 | | {kind: 'MethodCall'; receiver: Place; property: Place}; |
| 2976 | const testBlock = builder.enter('value', () => { |
| 2977 | if (calleePath.isOptionalCallExpression()) { |
| 2978 | // Recursively call lowerOptionalCallExpression to thread down the alternate block |
| 2979 | const value = lowerOptionalCallExpression(builder, calleePath, alternate); |
| 2980 | const valuePlace = lowerValueToTemporary(builder, value); |
| 2981 | callee = { |
| 2982 | kind: 'CallExpression', |
| 2983 | callee: valuePlace, |
| 2984 | }; |
| 2985 | } else if (calleePath.isOptionalMemberExpression()) { |
| 2986 | const {object, value} = lowerOptionalMemberExpression( |
| 2987 | builder, |
| 2988 | calleePath, |
| 2989 | alternate, |
| 2990 | ); |
| 2991 | callee = { |
| 2992 | kind: 'MethodCall', |
| 2993 | receiver: object, |
| 2994 | property: value, |
| 2995 | }; |
| 2996 | } else if (calleePath.isMemberExpression()) { |
| 2997 | const memberExpr = lowerMemberExpression(builder, calleePath); |
| 2998 | const propertyPlace = lowerValueToTemporary(builder, memberExpr.value); |
| 2999 | callee = { |
| 3000 | kind: 'MethodCall', |
| 3001 | receiver: memberExpr.object, |
| 3002 | property: propertyPlace, |
| 3003 | }; |
| 3004 | } else { |
| 3005 | callee = { |
| 3006 | kind: 'CallExpression', |
| 3007 | callee: lowerExpressionToTemporary(builder, calleePath), |
| 3008 | }; |
| 3009 | } |
| 3010 | const testPlace = |
| 3011 | callee.kind === 'CallExpression' ? callee.callee : callee.property; |
| 3012 | return { |
| 3013 | kind: 'branch', |
| 3014 | test: {...testPlace}, |
| 3015 | consequent: consequent.id, |
| 3016 | alternate, |
| 3017 | fallthrough: continuationBlock.id, |
| 3018 | id: makeInstructionId(0), |
| 3019 | loc, |
| 3020 | }; |
| 3021 | }); |
| 3022 | |
| 3023 | /* |
| 3024 | * block to evaluate if the callee is non-null/undefined. arguments are lowered in this block to preserve |
| 3025 | * the semantic of conditional evaluation depending on the callee |
| 3026 | */ |
| 3027 | builder.enterReserved(consequent, () => { |
| 3028 | const args = lowerArguments(builder, expr.get('arguments')); |
| 3029 | const temp = buildTemporaryPlace(builder, loc); |
| 3030 | if (callee.kind === 'CallExpression') { |
| 3031 | builder.push({ |
| 3032 | id: makeInstructionId(0), |
| 3033 | lvalue: {...temp}, |
| 3034 | value: { |
| 3035 | kind: 'CallExpression', |
| 3036 | callee: {...callee.callee}, |
| 3037 | args, |
| 3038 | loc, |
| 3039 | }, |
| 3040 | effects: null, |
| 3041 | loc, |
| 3042 | }); |
| 3043 | } else { |
| 3044 | builder.push({ |
| 3045 | id: makeInstructionId(0), |
| 3046 | lvalue: {...temp}, |
| 3047 | value: { |
| 3048 | kind: 'MethodCall', |
| 3049 | receiver: {...callee.receiver}, |
| 3050 | property: {...callee.property}, |
| 3051 | args, |
| 3052 | loc, |
| 3053 | }, |
| 3054 | effects: null, |
| 3055 | loc, |
| 3056 | }); |
| 3057 | } |
| 3058 | lowerValueToTemporary(builder, { |
| 3059 | kind: 'StoreLocal', |
| 3060 | lvalue: {kind: InstructionKind.Const, place: {...place}}, |
| 3061 | value: {...temp}, |
| 3062 | type: null, |
| 3063 | loc, |
| 3064 | }); |
| 3065 | return { |
| 3066 | kind: 'goto', |
| 3067 | variant: GotoVariant.Break, |
| 3068 | block: continuationBlock.id, |
| 3069 | id: makeInstructionId(0), |
| 3070 | loc, |
| 3071 | }; |
| 3072 | }); |
| 3073 | |
| 3074 | builder.terminateWithContinuation( |
| 3075 | { |
| 3076 | kind: 'optional', |
| 3077 | optional, |
| 3078 | test: testBlock, |
| 3079 | fallthrough: continuationBlock.id, |
| 3080 | id: makeInstructionId(0), |
| 3081 | loc, |
| 3082 | }, |
| 3083 | continuationBlock, |
| 3084 | ); |
| 3085 | |
| 3086 | return {kind: 'LoadLocal', place, loc: place.loc}; |
| 3087 | } |
| 3088 | |
| 3089 | /* |
| 3090 | * There are a few places where we do not preserve original evaluation ordering and/or control flow, such as |
| 3091 | * switch case test values and default values in destructuring (assignment patterns). In these cases we allow |
| 3092 | * simple expressions whose evaluation cannot be observed: |
| 3093 | * - primitives |
| 3094 | * - arrays/objects whose values are also safely reorderable. |
| 3095 | */ |
| 3096 | function lowerReorderableExpression( |
| 3097 | builder: HIRBuilder, |
| 3098 | expr: NodePath<t.Expression>, |
| 3099 | ): Place { |
| 3100 | if (!isReorderableExpression(builder, expr, true)) { |
| 3101 | builder.recordError( |
| 3102 | new CompilerErrorDetail({ |
| 3103 | reason: `(BuildHIR::node.lowerReorderableExpression) Expression type \`${expr.type}\` cannot be safely reordered`, |
| 3104 | category: ErrorCategory.Todo, |
| 3105 | loc: expr.node.loc ?? null, |
| 3106 | suggestions: null, |
| 3107 | }), |
| 3108 | ); |
| 3109 | } |
| 3110 | return lowerExpressionToTemporary(builder, expr); |
| 3111 | } |
| 3112 | |
| 3113 | function isReorderableExpression( |
| 3114 | builder: HIRBuilder, |
| 3115 | expr: NodePath<t.Expression>, |
| 3116 | allowLocalIdentifiers: boolean, |
| 3117 | ): boolean { |
| 3118 | switch (expr.node.type) { |
| 3119 | case 'Identifier': { |
| 3120 | const binding = builder.resolveIdentifier(expr as NodePath<t.Identifier>); |
| 3121 | if (binding.kind === 'Identifier') { |
| 3122 | return allowLocalIdentifiers; |
| 3123 | } else { |
| 3124 | // global, definitely safe |
| 3125 | return true; |
| 3126 | } |
| 3127 | } |
| 3128 | case 'TSInstantiationExpression': { |
| 3129 | const innerExpr = (expr as NodePath<t.TSInstantiationExpression>).get( |
| 3130 | 'expression', |
| 3131 | ) as NodePath<t.Expression>; |
| 3132 | return isReorderableExpression(builder, innerExpr, allowLocalIdentifiers); |
| 3133 | } |
| 3134 | case 'RegExpLiteral': |
| 3135 | case 'StringLiteral': |
| 3136 | case 'NumericLiteral': |
| 3137 | case 'NullLiteral': |
| 3138 | case 'BooleanLiteral': |
| 3139 | case 'BigIntLiteral': { |
| 3140 | return true; |
| 3141 | } |
| 3142 | case 'UnaryExpression': { |
| 3143 | const unary = expr as NodePath<t.UnaryExpression>; |
| 3144 | switch (expr.node.operator) { |
| 3145 | case '!': |
| 3146 | case '+': |
| 3147 | case '-': { |
| 3148 | return isReorderableExpression( |
| 3149 | builder, |
| 3150 | unary.get('argument'), |
| 3151 | allowLocalIdentifiers, |
| 3152 | ); |
| 3153 | } |
| 3154 | default: { |
| 3155 | return false; |
| 3156 | } |
| 3157 | } |
| 3158 | } |
| 3159 | case 'TSAsExpression': |
| 3160 | case 'TSNonNullExpression': |
| 3161 | case 'TypeCastExpression': { |
| 3162 | return isReorderableExpression( |
| 3163 | builder, |
| 3164 | (expr as NodePath<t.TypeCastExpression>).get('expression'), |
| 3165 | allowLocalIdentifiers, |
| 3166 | ); |
| 3167 | } |
| 3168 | case 'LogicalExpression': { |
| 3169 | const logical = expr as NodePath<t.LogicalExpression>; |
| 3170 | return ( |
| 3171 | isReorderableExpression( |
| 3172 | builder, |
| 3173 | logical.get('left'), |
| 3174 | allowLocalIdentifiers, |
| 3175 | ) && |
| 3176 | isReorderableExpression( |
| 3177 | builder, |
| 3178 | logical.get('right'), |
| 3179 | allowLocalIdentifiers, |
| 3180 | ) |
| 3181 | ); |
| 3182 | } |
| 3183 | case 'ConditionalExpression': { |
| 3184 | const conditional = expr as NodePath<t.ConditionalExpression>; |
| 3185 | return ( |
| 3186 | isReorderableExpression( |
| 3187 | builder, |
| 3188 | conditional.get('test'), |
| 3189 | allowLocalIdentifiers, |
| 3190 | ) && |
| 3191 | isReorderableExpression( |
| 3192 | builder, |
| 3193 | conditional.get('consequent'), |
| 3194 | allowLocalIdentifiers, |
| 3195 | ) && |
| 3196 | isReorderableExpression( |
| 3197 | builder, |
| 3198 | conditional.get('alternate'), |
| 3199 | allowLocalIdentifiers, |
| 3200 | ) |
| 3201 | ); |
| 3202 | } |
| 3203 | case 'ArrayExpression': { |
| 3204 | return (expr as NodePath<t.ArrayExpression>) |
| 3205 | .get('elements') |
| 3206 | .every( |
| 3207 | element => |
| 3208 | element.isExpression() && |
| 3209 | isReorderableExpression(builder, element, allowLocalIdentifiers), |
| 3210 | ); |
| 3211 | } |
| 3212 | case 'ObjectExpression': { |
| 3213 | return (expr as NodePath<t.ObjectExpression>) |
| 3214 | .get('properties') |
| 3215 | .every(property => { |
| 3216 | if (!property.isObjectProperty() || property.node.computed) { |
| 3217 | return false; |
| 3218 | } |
| 3219 | const value = property.get('value'); |
| 3220 | return ( |
| 3221 | value.isExpression() && |
| 3222 | isReorderableExpression(builder, value, allowLocalIdentifiers) |
| 3223 | ); |
| 3224 | }); |
| 3225 | } |
| 3226 | case 'MemberExpression': { |
| 3227 | /* |
| 3228 | * A common pattern is switch statements where the case test values are properties of a global, |
| 3229 | * eg `case ProductOptions.Option: { ... }` |
| 3230 | * We therefore allow expressions where the innermost object is a global identifier, and reject |
| 3231 | * all other member expressions (for now). |
| 3232 | */ |
| 3233 | const test = expr as NodePath<t.MemberExpression>; |
| 3234 | let innerObject: NodePath<t.Expression> = test; |
| 3235 | while (innerObject.isMemberExpression()) { |
| 3236 | innerObject = innerObject.get('object'); |
| 3237 | } |
| 3238 | if ( |
| 3239 | innerObject.isIdentifier() && |
| 3240 | builder.resolveIdentifier(innerObject).kind !== 'Identifier' |
| 3241 | ) { |
| 3242 | // This is a property/computed load from a global, that's safe to reorder |
| 3243 | return true; |
| 3244 | } else { |
| 3245 | return false; |
| 3246 | } |
| 3247 | } |
| 3248 | case 'ArrowFunctionExpression': { |
| 3249 | const fn = expr as NodePath<t.ArrowFunctionExpression>; |
| 3250 | const body = fn.get('body'); |
| 3251 | if (body.node.type === 'BlockStatement') { |
| 3252 | return body.node.body.length === 0; |
| 3253 | } else { |
| 3254 | // For TypeScript |
| 3255 | invariant(body.isExpression(), 'Expected an expression'); |
| 3256 | return isReorderableExpression( |
| 3257 | builder, |
| 3258 | body, |
| 3259 | /* disallow local identifiers in the body */ false, |
| 3260 | ); |
| 3261 | } |
| 3262 | } |
| 3263 | case 'CallExpression': { |
| 3264 | const call = expr as NodePath<t.CallExpression>; |
| 3265 | const callee = call.get('callee'); |
| 3266 | return ( |
| 3267 | callee.isExpression() && |
| 3268 | isReorderableExpression(builder, callee, allowLocalIdentifiers) && |
| 3269 | call |
| 3270 | .get('arguments') |
| 3271 | .every( |
| 3272 | arg => |
| 3273 | arg.isExpression() && |
| 3274 | isReorderableExpression(builder, arg, allowLocalIdentifiers), |
| 3275 | ) |
| 3276 | ); |
| 3277 | } |
| 3278 | case 'NewExpression': { |
| 3279 | const newExpr = expr as NodePath<t.NewExpression>; |
| 3280 | const callee = newExpr.get('callee'); |
| 3281 | return ( |
| 3282 | callee.isExpression() && |
| 3283 | isReorderableExpression(builder, callee, allowLocalIdentifiers) && |
| 3284 | newExpr |
| 3285 | .get('arguments') |
| 3286 | .every( |
| 3287 | arg => |
| 3288 | arg.isExpression() && |
| 3289 | isReorderableExpression(builder, arg, allowLocalIdentifiers), |
| 3290 | ) |
| 3291 | ); |
| 3292 | } |
| 3293 | default: { |
| 3294 | return false; |
| 3295 | } |
| 3296 | } |
| 3297 | } |
| 3298 | |
| 3299 | function lowerArguments( |
| 3300 | builder: HIRBuilder, |
| 3301 | expr: Array< |
| 3302 | NodePath< |
| 3303 | | t.Expression |
| 3304 | | t.SpreadElement |
| 3305 | | t.JSXNamespacedName |
| 3306 | | t.ArgumentPlaceholder |
| 3307 | > |
| 3308 | >, |
| 3309 | ): Array<Place | SpreadPattern> { |
| 3310 | let args: Array<Place | SpreadPattern> = []; |
| 3311 | for (const argPath of expr) { |
| 3312 | if (argPath.isSpreadElement()) { |
| 3313 | args.push({ |
| 3314 | kind: 'Spread', |
| 3315 | place: lowerExpressionToTemporary(builder, argPath.get('argument')), |
| 3316 | }); |
| 3317 | } else if (argPath.isExpression()) { |
| 3318 | args.push(lowerExpressionToTemporary(builder, argPath)); |
| 3319 | } else { |
| 3320 | builder.recordError( |
| 3321 | new CompilerErrorDetail({ |
| 3322 | reason: `(BuildHIR::lowerExpression) Handle ${argPath.type} arguments in CallExpression`, |
| 3323 | category: ErrorCategory.Todo, |
| 3324 | loc: argPath.node.loc ?? null, |
| 3325 | suggestions: null, |
| 3326 | }), |
| 3327 | ); |
| 3328 | } |
| 3329 | } |
| 3330 | return args; |
| 3331 | } |
| 3332 | |
| 3333 | type LoweredMemberExpression = { |
| 3334 | object: Place; |
| 3335 | property: Place | string | number; |
| 3336 | value: InstructionValue; |
| 3337 | }; |
| 3338 | function lowerMemberExpression( |
| 3339 | builder: HIRBuilder, |
| 3340 | expr: NodePath<t.MemberExpression | t.OptionalMemberExpression>, |
| 3341 | loweredObject: Place | null = null, |
| 3342 | ): LoweredMemberExpression { |
| 3343 | const exprNode = expr.node; |
| 3344 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 3345 | const objectNode = expr.get('object'); |
| 3346 | const propertyNode = expr.get('property'); |
| 3347 | const object = |
| 3348 | loweredObject ?? lowerExpressionToTemporary(builder, objectNode); |
| 3349 | |
| 3350 | if (!expr.node.computed || expr.node.property.type === 'NumericLiteral') { |
| 3351 | let property: PropertyLiteral; |
| 3352 | if (propertyNode.isIdentifier()) { |
| 3353 | property = makePropertyLiteral(propertyNode.node.name); |
| 3354 | } else if (propertyNode.isNumericLiteral()) { |
| 3355 | property = makePropertyLiteral(propertyNode.node.value); |
| 3356 | } else { |
| 3357 | builder.recordError( |
| 3358 | new CompilerErrorDetail({ |
| 3359 | reason: `(BuildHIR::lowerMemberExpression) Handle ${propertyNode.type} property`, |
| 3360 | category: ErrorCategory.Todo, |
| 3361 | loc: propertyNode.node.loc ?? null, |
| 3362 | suggestions: null, |
| 3363 | }), |
| 3364 | ); |
| 3365 | return { |
| 3366 | object, |
| 3367 | property: propertyNode.toString(), |
| 3368 | value: {kind: 'UnsupportedNode', node: exprNode, loc: exprLoc}, |
| 3369 | }; |
| 3370 | } |
| 3371 | const value: InstructionValue = { |
| 3372 | kind: 'PropertyLoad', |
| 3373 | object: {...object}, |
| 3374 | property, |
| 3375 | loc: exprLoc, |
| 3376 | }; |
| 3377 | return {object, property, value}; |
| 3378 | } else { |
| 3379 | if (!propertyNode.isExpression()) { |
| 3380 | builder.recordError( |
| 3381 | new CompilerErrorDetail({ |
| 3382 | reason: `(BuildHIR::lowerMemberExpression) Expected Expression, got ${propertyNode.type} property`, |
| 3383 | category: ErrorCategory.Todo, |
| 3384 | loc: propertyNode.node.loc ?? null, |
| 3385 | suggestions: null, |
| 3386 | }), |
| 3387 | ); |
| 3388 | return { |
| 3389 | object, |
| 3390 | property: propertyNode.toString(), |
| 3391 | value: { |
| 3392 | kind: 'UnsupportedNode', |
| 3393 | node: exprNode, |
| 3394 | loc: exprLoc, |
| 3395 | }, |
| 3396 | }; |
| 3397 | } |
| 3398 | const property = lowerExpressionToTemporary(builder, propertyNode); |
| 3399 | const value: InstructionValue = { |
| 3400 | kind: 'ComputedLoad', |
| 3401 | object: {...object}, |
| 3402 | property: {...property}, |
| 3403 | loc: exprLoc, |
| 3404 | }; |
| 3405 | return {object, property, value}; |
| 3406 | } |
| 3407 | } |
| 3408 | |
| 3409 | function lowerJsxElementName( |
| 3410 | builder: HIRBuilder, |
| 3411 | exprPath: NodePath< |
| 3412 | t.JSXIdentifier | t.JSXMemberExpression | t.JSXNamespacedName |
| 3413 | >, |
| 3414 | ): Place | BuiltinTag { |
| 3415 | const exprNode = exprPath.node; |
| 3416 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 3417 | if (exprPath.isJSXIdentifier()) { |
| 3418 | const tag: string = exprPath.node.name; |
| 3419 | if (!tag.match(/^[a-z]/)) { |
| 3420 | const kind = getLoadKind(builder, exprPath); |
| 3421 | return lowerValueToTemporary(builder, { |
| 3422 | kind: kind, |
| 3423 | place: lowerIdentifier(builder, exprPath), |
| 3424 | loc: exprLoc, |
| 3425 | }); |
| 3426 | } else { |
| 3427 | return { |
| 3428 | kind: 'BuiltinTag', |
| 3429 | name: tag, |
| 3430 | loc: exprLoc, |
| 3431 | }; |
| 3432 | } |
| 3433 | } else if (exprPath.isJSXMemberExpression()) { |
| 3434 | return lowerJsxMemberExpression(builder, exprPath); |
| 3435 | } else if (exprPath.isJSXNamespacedName()) { |
| 3436 | const namespace = exprPath.node.namespace.name; |
| 3437 | const name = exprPath.node.name.name; |
| 3438 | const tag = `${namespace}:${name}`; |
| 3439 | if (namespace.indexOf(':') !== -1 || name.indexOf(':') !== -1) { |
| 3440 | builder.recordError( |
| 3441 | new CompilerErrorDetail({ |
| 3442 | reason: `Expected JSXNamespacedName to have no colons in the namespace or name`, |
| 3443 | description: `Got \`${namespace}\` : \`${name}\``, |
| 3444 | category: ErrorCategory.Syntax, |
| 3445 | loc: exprPath.node.loc ?? null, |
| 3446 | suggestions: null, |
| 3447 | }), |
| 3448 | ); |
| 3449 | } |
| 3450 | const place = lowerValueToTemporary(builder, { |
| 3451 | kind: 'Primitive', |
| 3452 | value: tag, |
| 3453 | loc: exprLoc, |
| 3454 | }); |
| 3455 | return place; |
| 3456 | } else { |
| 3457 | builder.recordError( |
| 3458 | new CompilerErrorDetail({ |
| 3459 | reason: `(BuildHIR::lowerJsxElementName) Handle ${exprPath.type} tags`, |
| 3460 | category: ErrorCategory.Todo, |
| 3461 | loc: exprPath.node.loc ?? null, |
| 3462 | suggestions: null, |
| 3463 | }), |
| 3464 | ); |
| 3465 | return lowerValueToTemporary(builder, { |
| 3466 | kind: 'UnsupportedNode', |
| 3467 | node: exprNode, |
| 3468 | loc: exprLoc, |
| 3469 | }); |
| 3470 | } |
| 3471 | } |
| 3472 | |
| 3473 | function lowerJsxMemberExpression( |
| 3474 | builder: HIRBuilder, |
| 3475 | exprPath: NodePath<t.JSXMemberExpression>, |
| 3476 | ): Place { |
| 3477 | const loc = exprPath.node.loc ?? GeneratedSource; |
| 3478 | const object = exprPath.get('object'); |
| 3479 | let objectPlace: Place; |
| 3480 | if (object.isJSXMemberExpression()) { |
| 3481 | objectPlace = lowerJsxMemberExpression(builder, object); |
| 3482 | } else { |
| 3483 | CompilerError.invariant(object.isJSXIdentifier(), { |
| 3484 | reason: `TypeScript refinement fail: expected 'JsxIdentifier', got \`${object.node.type}\``, |
| 3485 | loc: object.node.loc ?? GeneratedSource, |
| 3486 | }); |
| 3487 | |
| 3488 | const kind = getLoadKind(builder, object); |
| 3489 | objectPlace = lowerValueToTemporary(builder, { |
| 3490 | kind: kind, |
| 3491 | place: lowerIdentifier(builder, object), |
| 3492 | loc: exprPath.node.loc ?? GeneratedSource, |
| 3493 | }); |
| 3494 | } |
| 3495 | const property = exprPath.get('property').node.name; |
| 3496 | return lowerValueToTemporary(builder, { |
| 3497 | kind: 'PropertyLoad', |
| 3498 | object: objectPlace, |
| 3499 | property: makePropertyLiteral(property), |
| 3500 | loc, |
| 3501 | }); |
| 3502 | } |
| 3503 | |
| 3504 | function lowerJsxElement( |
| 3505 | builder: HIRBuilder, |
| 3506 | exprPath: NodePath< |
| 3507 | | t.JSXText |
| 3508 | | t.JSXExpressionContainer |
| 3509 | | t.JSXSpreadChild |
| 3510 | | t.JSXElement |
| 3511 | | t.JSXFragment |
| 3512 | >, |
| 3513 | ): Place | null { |
| 3514 | const exprNode = exprPath.node; |
| 3515 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 3516 | if (exprPath.isJSXElement() || exprPath.isJSXFragment()) { |
| 3517 | return lowerExpressionToTemporary(builder, exprPath); |
| 3518 | } else if (exprPath.isJSXExpressionContainer()) { |
| 3519 | const expression = exprPath.get('expression'); |
| 3520 | if (expression.isJSXEmptyExpression()) { |
| 3521 | return null; |
| 3522 | } else { |
| 3523 | CompilerError.invariant(expression.isExpression(), { |
| 3524 | reason: `(BuildHIR::lowerJsxElement) Expected Expression but found ${expression.type}!`, |
| 3525 | loc: expression.node.loc ?? GeneratedSource, |
| 3526 | }); |
| 3527 | return lowerExpressionToTemporary(builder, expression); |
| 3528 | } |
| 3529 | } else if (exprPath.isJSXText()) { |
| 3530 | let text: string | null; |
| 3531 | if (builder.fbtDepth > 0) { |
| 3532 | /* |
| 3533 | * FBT whitespace normalization differs from standard JSX. |
| 3534 | * https://github.com/facebook/fbt/blob/0b4e0d13c30bffd0daa2a75715d606e3587b4e40/packages/babel-plugin-fbt/src/FbtUtil.js#L76-L87 |
| 3535 | * Since the fbt transform runs after, let's just preserve all |
| 3536 | * whitespace in FBT subtrees as is. |
| 3537 | */ |
| 3538 | text = exprPath.node.value; |
| 3539 | } else { |
| 3540 | text = trimJsxText(exprPath.node.value); |
| 3541 | } |
| 3542 | |
| 3543 | if (text === null) { |
| 3544 | return null; |
| 3545 | } |
| 3546 | const place = lowerValueToTemporary(builder, { |
| 3547 | kind: 'JSXText', |
| 3548 | value: text, |
| 3549 | loc: exprLoc, |
| 3550 | }); |
| 3551 | return place; |
| 3552 | } else { |
| 3553 | builder.recordError( |
| 3554 | new CompilerErrorDetail({ |
| 3555 | reason: `(BuildHIR::lowerJsxElement) Unhandled JsxElement, got: ${exprPath.type}`, |
| 3556 | category: ErrorCategory.Todo, |
| 3557 | loc: exprPath.node.loc ?? null, |
| 3558 | suggestions: null, |
| 3559 | }), |
| 3560 | ); |
| 3561 | const place = lowerValueToTemporary(builder, { |
| 3562 | kind: 'UnsupportedNode', |
| 3563 | node: exprNode, |
| 3564 | loc: exprLoc, |
| 3565 | }); |
| 3566 | return place; |
| 3567 | } |
| 3568 | } |
| 3569 | |
| 3570 | /* |
| 3571 | * Trims whitespace according to the JSX spec: |
| 3572 | * > JSX removes whitespace at the beginning and ending of a line. |
| 3573 | * > It also removes blank lines. New lines adjacent to tags are removed; |
| 3574 | * > new lines that occur in the middle of string literals are condensed |
| 3575 | * > into a single space. |
| 3576 | * |
| 3577 | * From https://legacy.reactjs.org/docs/jsx-in-depth.html#string-literals-1 |
| 3578 | * |
| 3579 | * Implementation adapted from Babel: |
| 3580 | * https://github.com/babel/babel/blob/54d30f206057be64b496d2da1ec8c49d244ba4e4/packages/babel-types/src/utils/react/cleanJSXElementLiteralChild.ts#L5 |
| 3581 | */ |
| 3582 | function trimJsxText(original: string): string | null { |
| 3583 | const lines = original.split(/\r\n|\n|\r/); |
| 3584 | |
| 3585 | let lastNonEmptyLine = 0; |
| 3586 | |
| 3587 | for (let i = 0; i < lines.length; i++) { |
| 3588 | if (lines[i].match(/[^ \t]/)) { |
| 3589 | lastNonEmptyLine = i; |
| 3590 | } |
| 3591 | } |
| 3592 | |
| 3593 | let str = ''; |
| 3594 | |
| 3595 | for (let i = 0; i < lines.length; i++) { |
| 3596 | const line = lines[i]; |
| 3597 | |
| 3598 | const isFirstLine = i === 0; |
| 3599 | const isLastLine = i === lines.length - 1; |
| 3600 | const isLastNonEmptyLine = i === lastNonEmptyLine; |
| 3601 | |
| 3602 | // replace rendered whitespace tabs with spaces |
| 3603 | let trimmedLine = line.replace(/\t/g, ' '); |
| 3604 | |
| 3605 | // trim whitespace touching a newline |
| 3606 | if (!isFirstLine) { |
| 3607 | trimmedLine = trimmedLine.replace(/^[ ]+/, ''); |
| 3608 | } |
| 3609 | |
| 3610 | // trim whitespace touching an endline |
| 3611 | if (!isLastLine) { |
| 3612 | trimmedLine = trimmedLine.replace(/[ ]+$/, ''); |
| 3613 | } |
| 3614 | |
| 3615 | if (trimmedLine) { |
| 3616 | if (!isLastNonEmptyLine) { |
| 3617 | trimmedLine += ' '; |
| 3618 | } |
| 3619 | |
| 3620 | str += trimmedLine; |
| 3621 | } |
| 3622 | } |
| 3623 | |
| 3624 | if (str.length !== 0) { |
| 3625 | return str; |
| 3626 | } else { |
| 3627 | return null; |
| 3628 | } |
| 3629 | } |
| 3630 | |
| 3631 | function lowerFunctionToValue( |
| 3632 | builder: HIRBuilder, |
| 3633 | expr: NodePath< |
| 3634 | t.FunctionExpression | t.ArrowFunctionExpression | t.FunctionDeclaration |
| 3635 | >, |
| 3636 | ): InstructionValue { |
| 3637 | const exprNode = expr.node; |
| 3638 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 3639 | const loweredFunc = lowerFunction(builder, expr); |
| 3640 | return { |
| 3641 | kind: 'FunctionExpression', |
| 3642 | name: loweredFunc.func.id, |
| 3643 | nameHint: null, |
| 3644 | type: expr.node.type, |
| 3645 | loc: exprLoc, |
| 3646 | loweredFunc, |
| 3647 | }; |
| 3648 | } |
| 3649 | |
| 3650 | function lowerFunction( |
| 3651 | builder: HIRBuilder, |
| 3652 | expr: NodePath< |
| 3653 | | t.FunctionExpression |
| 3654 | | t.ArrowFunctionExpression |
| 3655 | | t.FunctionDeclaration |
| 3656 | | t.ObjectMethod |
| 3657 | >, |
| 3658 | ): LoweredFunction { |
| 3659 | const componentScope: Scope = builder.environment.parentFunction.scope; |
| 3660 | const capturedContext = gatherCapturedContext(expr, componentScope); |
| 3661 | |
| 3662 | /* |
| 3663 | * TODO(gsn): In the future, we could only pass in the context identifiers |
| 3664 | * that are actually used by this function and it's nested functions, rather |
| 3665 | * than all context identifiers. |
| 3666 | * |
| 3667 | * This isn't a problem in practice because use Babel's scope analysis to |
| 3668 | * identify the correct references. |
| 3669 | */ |
| 3670 | const loweredFunc = lower( |
| 3671 | expr, |
| 3672 | builder.environment, |
| 3673 | builder.bindings, |
| 3674 | new Map([...builder.context, ...capturedContext]), |
| 3675 | ); |
| 3676 | return { |
| 3677 | func: loweredFunc, |
| 3678 | }; |
| 3679 | } |
| 3680 | |
| 3681 | function lowerExpressionToTemporary( |
| 3682 | builder: HIRBuilder, |
| 3683 | exprPath: NodePath<t.Expression>, |
| 3684 | ): Place { |
| 3685 | const value = lowerExpression(builder, exprPath); |
| 3686 | return lowerValueToTemporary(builder, value); |
| 3687 | } |
| 3688 | |
| 3689 | export function lowerValueToTemporary( |
| 3690 | builder: HIRBuilder, |
| 3691 | value: InstructionValue, |
| 3692 | ): Place { |
| 3693 | if (value.kind === 'LoadLocal' && value.place.identifier.name === null) { |
| 3694 | return value.place; |
| 3695 | } |
| 3696 | const place: Place = buildTemporaryPlace(builder, value.loc); |
| 3697 | builder.push({ |
| 3698 | id: makeInstructionId(0), |
| 3699 | lvalue: {...place}, |
| 3700 | value: value, |
| 3701 | effects: null, |
| 3702 | loc: value.loc, |
| 3703 | }); |
| 3704 | return place; |
| 3705 | } |
| 3706 | |
| 3707 | function lowerIdentifier( |
| 3708 | builder: HIRBuilder, |
| 3709 | exprPath: NodePath<t.Identifier | t.JSXIdentifier>, |
| 3710 | ): Place { |
| 3711 | const exprNode = exprPath.node; |
| 3712 | const exprLoc = exprNode.loc ?? GeneratedSource; |
| 3713 | const binding = builder.resolveIdentifier(exprPath); |
| 3714 | switch (binding.kind) { |
| 3715 | case 'Identifier': { |
| 3716 | const place: Place = { |
| 3717 | kind: 'Identifier', |
| 3718 | identifier: binding.identifier, |
| 3719 | effect: Effect.Unknown, |
| 3720 | reactive: false, |
| 3721 | loc: exprLoc, |
| 3722 | }; |
| 3723 | return place; |
| 3724 | } |
| 3725 | default: { |
| 3726 | if (binding.kind === 'Global' && binding.name === 'eval') { |
| 3727 | builder.recordError( |
| 3728 | new CompilerErrorDetail({ |
| 3729 | reason: `The 'eval' function is not supported`, |
| 3730 | description: |
| 3731 | 'Eval is an anti-pattern in JavaScript, and the code executed cannot be evaluated by React Compiler', |
| 3732 | category: ErrorCategory.UnsupportedSyntax, |
| 3733 | loc: exprPath.node.loc ?? null, |
| 3734 | suggestions: null, |
| 3735 | }), |
| 3736 | ); |
| 3737 | } |
| 3738 | return lowerValueToTemporary(builder, { |
| 3739 | kind: 'LoadGlobal', |
| 3740 | binding, |
| 3741 | loc: exprLoc, |
| 3742 | }); |
| 3743 | } |
| 3744 | } |
| 3745 | } |
| 3746 | |
| 3747 | // Creates a temporary Identifier and Place referencing that identifier. |
| 3748 | function buildTemporaryPlace(builder: HIRBuilder, loc: SourceLocation): Place { |
| 3749 | const place: Place = { |
| 3750 | kind: 'Identifier', |
| 3751 | identifier: builder.makeTemporary(loc), |
| 3752 | effect: Effect.Unknown, |
| 3753 | reactive: false, |
| 3754 | loc, |
| 3755 | }; |
| 3756 | return place; |
| 3757 | } |
| 3758 | |
| 3759 | function getStoreKind( |
| 3760 | builder: HIRBuilder, |
| 3761 | identifier: NodePath<t.Identifier>, |
| 3762 | ): 'StoreLocal' | 'StoreContext' { |
| 3763 | const isContext = builder.isContextIdentifier(identifier); |
| 3764 | return isContext ? 'StoreContext' : 'StoreLocal'; |
| 3765 | } |
| 3766 | |
| 3767 | function getLoadKind( |
| 3768 | builder: HIRBuilder, |
| 3769 | identifier: NodePath<t.Identifier | t.JSXIdentifier>, |
| 3770 | ): 'LoadLocal' | 'LoadContext' { |
| 3771 | const isContext = builder.isContextIdentifier(identifier); |
| 3772 | return isContext ? 'LoadContext' : 'LoadLocal'; |
| 3773 | } |
| 3774 | |
| 3775 | function lowerIdentifierForAssignment( |
| 3776 | builder: HIRBuilder, |
| 3777 | loc: SourceLocation, |
| 3778 | kind: InstructionKind, |
| 3779 | path: NodePath<t.Identifier>, |
| 3780 | ): Place | {kind: 'Global'; name: string} | null { |
| 3781 | const binding = builder.resolveIdentifier(path); |
| 3782 | if (binding.kind !== 'Identifier') { |
| 3783 | if (kind === InstructionKind.Reassign) { |
| 3784 | return {kind: 'Global', name: path.node.name}; |
| 3785 | } else { |
| 3786 | // Else its an internal error bc we couldn't find the binding |
| 3787 | builder.recordError( |
| 3788 | new CompilerErrorDetail({ |
| 3789 | reason: `(BuildHIR::lowerAssignment) Could not find binding for declaration.`, |
| 3790 | category: ErrorCategory.Invariant, |
| 3791 | loc: path.node.loc ?? null, |
| 3792 | suggestions: null, |
| 3793 | }), |
| 3794 | ); |
| 3795 | return null; |
| 3796 | } |
| 3797 | } else if ( |
| 3798 | binding.bindingKind === 'const' && |
| 3799 | kind === InstructionKind.Reassign |
| 3800 | ) { |
| 3801 | builder.recordError( |
| 3802 | new CompilerErrorDetail({ |
| 3803 | reason: `Cannot reassign a \`const\` variable`, |
| 3804 | category: ErrorCategory.Syntax, |
| 3805 | loc: path.node.loc ?? null, |
| 3806 | description: |
| 3807 | binding.identifier.name != null |
| 3808 | ? `\`${binding.identifier.name.value}\` is declared as const` |
| 3809 | : null, |
| 3810 | }), |
| 3811 | ); |
| 3812 | return null; |
| 3813 | } |
| 3814 | |
| 3815 | const place: Place = { |
| 3816 | kind: 'Identifier', |
| 3817 | identifier: binding.identifier, |
| 3818 | effect: Effect.Unknown, |
| 3819 | reactive: false, |
| 3820 | loc, |
| 3821 | }; |
| 3822 | return place; |
| 3823 | } |
| 3824 | |
| 3825 | function lowerAssignment( |
| 3826 | builder: HIRBuilder, |
| 3827 | loc: SourceLocation, |
| 3828 | kind: InstructionKind, |
| 3829 | lvaluePath: NodePath<t.LVal>, |
| 3830 | value: Place, |
| 3831 | assignmentKind: 'Destructure' | 'Assignment', |
| 3832 | ): InstructionValue { |
| 3833 | const lvalueNode = lvaluePath.node; |
| 3834 | switch (lvalueNode.type) { |
| 3835 | case 'Identifier': { |
| 3836 | const lvalue = lvaluePath as NodePath<t.Identifier>; |
| 3837 | const place = lowerIdentifierForAssignment(builder, loc, kind, lvalue); |
| 3838 | if (place === null) { |
| 3839 | return { |
| 3840 | kind: 'UnsupportedNode', |
| 3841 | loc: lvalue.node.loc ?? GeneratedSource, |
| 3842 | node: lvalue.node, |
| 3843 | }; |
| 3844 | } else if (place.kind === 'Global') { |
| 3845 | const temporary = lowerValueToTemporary(builder, { |
| 3846 | kind: 'StoreGlobal', |
| 3847 | name: place.name, |
| 3848 | value, |
| 3849 | loc, |
| 3850 | }); |
| 3851 | return {kind: 'LoadLocal', place: temporary, loc: temporary.loc}; |
| 3852 | } |
| 3853 | const isHoistedIdentifier = builder.environment.isHoistedIdentifier( |
| 3854 | lvalue.node, |
| 3855 | ); |
| 3856 | |
| 3857 | let temporary; |
| 3858 | if (builder.isContextIdentifier(lvalue)) { |
| 3859 | if (kind === InstructionKind.Const && !isHoistedIdentifier) { |
| 3860 | builder.recordError( |
| 3861 | new CompilerErrorDetail({ |
| 3862 | reason: `Expected \`const\` declaration not to be reassigned`, |
| 3863 | category: ErrorCategory.Syntax, |
| 3864 | loc: lvalue.node.loc ?? null, |
| 3865 | suggestions: null, |
| 3866 | }), |
| 3867 | ); |
| 3868 | } |
| 3869 | |
| 3870 | if ( |
| 3871 | kind !== InstructionKind.Const && |
| 3872 | kind !== InstructionKind.Reassign && |
| 3873 | kind !== InstructionKind.Let && |
| 3874 | kind !== InstructionKind.Function |
| 3875 | ) { |
| 3876 | builder.recordError( |
| 3877 | new CompilerErrorDetail({ |
| 3878 | reason: `Unexpected context variable kind`, |
| 3879 | category: ErrorCategory.Syntax, |
| 3880 | loc: lvalue.node.loc ?? null, |
| 3881 | suggestions: null, |
| 3882 | }), |
| 3883 | ); |
| 3884 | temporary = lowerValueToTemporary(builder, { |
| 3885 | kind: 'UnsupportedNode', |
| 3886 | node: lvalueNode, |
| 3887 | loc: lvalueNode.loc ?? GeneratedSource, |
| 3888 | }); |
| 3889 | } else { |
| 3890 | temporary = lowerValueToTemporary(builder, { |
| 3891 | kind: 'StoreContext', |
| 3892 | lvalue: {place: {...place}, kind}, |
| 3893 | value, |
| 3894 | loc, |
| 3895 | }); |
| 3896 | } |
| 3897 | } else { |
| 3898 | const typeAnnotation = lvalue.get('typeAnnotation'); |
| 3899 | let type: t.FlowType | t.TSType | null; |
| 3900 | if (typeAnnotation.isTSTypeAnnotation()) { |
| 3901 | const typePath = typeAnnotation.get('typeAnnotation'); |
| 3902 | type = typePath.node; |
| 3903 | } else if (typeAnnotation.isTypeAnnotation()) { |
| 3904 | const typePath = typeAnnotation.get('typeAnnotation'); |
| 3905 | type = typePath.node; |
| 3906 | } else { |
| 3907 | type = null; |
| 3908 | } |
| 3909 | temporary = lowerValueToTemporary(builder, { |
| 3910 | kind: 'StoreLocal', |
| 3911 | lvalue: {place: {...place}, kind}, |
| 3912 | value, |
| 3913 | type, |
| 3914 | loc, |
| 3915 | }); |
| 3916 | } |
| 3917 | return {kind: 'LoadLocal', place: temporary, loc: temporary.loc}; |
| 3918 | } |
| 3919 | case 'MemberExpression': { |
| 3920 | // This can only occur because of a coding error, parsers enforce this condition |
| 3921 | CompilerError.invariant(kind === InstructionKind.Reassign, { |
| 3922 | reason: 'MemberExpression may only appear in an assignment expression', |
| 3923 | loc: lvaluePath.node.loc ?? GeneratedSource, |
| 3924 | }); |
| 3925 | const lvalue = lvaluePath as NodePath<t.MemberExpression>; |
| 3926 | const property = lvalue.get('property'); |
| 3927 | const object = lowerExpressionToTemporary(builder, lvalue.get('object')); |
| 3928 | if (!lvalue.node.computed || lvalue.get('property').isNumericLiteral()) { |
| 3929 | let temporary; |
| 3930 | if (property.isIdentifier()) { |
| 3931 | temporary = lowerValueToTemporary(builder, { |
| 3932 | kind: 'PropertyStore', |
| 3933 | object, |
| 3934 | property: makePropertyLiteral(property.node.name), |
| 3935 | value, |
| 3936 | loc, |
| 3937 | }); |
| 3938 | } else if (property.isNumericLiteral()) { |
| 3939 | temporary = lowerValueToTemporary(builder, { |
| 3940 | kind: 'PropertyStore', |
| 3941 | object, |
| 3942 | property: makePropertyLiteral(property.node.value), |
| 3943 | value, |
| 3944 | loc, |
| 3945 | }); |
| 3946 | } else { |
| 3947 | builder.recordError( |
| 3948 | new CompilerErrorDetail({ |
| 3949 | reason: `(BuildHIR::lowerAssignment) Handle ${property.type} properties in MemberExpression`, |
| 3950 | category: ErrorCategory.Todo, |
| 3951 | loc: property.node.loc ?? null, |
| 3952 | suggestions: null, |
| 3953 | }), |
| 3954 | ); |
| 3955 | return {kind: 'UnsupportedNode', node: lvalueNode, loc}; |
| 3956 | } |
| 3957 | return {kind: 'LoadLocal', place: temporary, loc: temporary.loc}; |
| 3958 | } else { |
| 3959 | if (!property.isExpression()) { |
| 3960 | builder.recordError( |
| 3961 | new CompilerErrorDetail({ |
| 3962 | reason: |
| 3963 | '(BuildHIR::lowerAssignment) Expected private name to appear as a non-computed property', |
| 3964 | category: ErrorCategory.Todo, |
| 3965 | loc: property.node.loc ?? null, |
| 3966 | suggestions: null, |
| 3967 | }), |
| 3968 | ); |
| 3969 | return {kind: 'UnsupportedNode', node: lvalueNode, loc}; |
| 3970 | } |
| 3971 | const propertyPlace = lowerExpressionToTemporary(builder, property); |
| 3972 | const temporary = lowerValueToTemporary(builder, { |
| 3973 | kind: 'ComputedStore', |
| 3974 | object, |
| 3975 | property: propertyPlace, |
| 3976 | value, |
| 3977 | loc, |
| 3978 | }); |
| 3979 | return {kind: 'LoadLocal', place: temporary, loc: temporary.loc}; |
| 3980 | } |
| 3981 | } |
| 3982 | case 'ArrayPattern': { |
| 3983 | const lvalue = lvaluePath as NodePath<t.ArrayPattern>; |
| 3984 | const elements = lvalue.get('elements'); |
| 3985 | const items: ArrayPattern['items'] = []; |
| 3986 | const followups: Array<{place: Place; path: NodePath<t.LVal>}> = []; |
| 3987 | /* |
| 3988 | * A given destructuring statement must contain all declarations or all |
| 3989 | * reassignments. This is enforced by the parser, but we rewrite nested |
| 3990 | * destructuring into assignment to a temporary. Therefore, if we see |
| 3991 | * any reassignments that are nested destructuring we fall back to |
| 3992 | * using temporaries for all variables, and emitting the actual reassignments |
| 3993 | * in follow-up statements |
| 3994 | */ |
| 3995 | const forceTemporaries = |
| 3996 | kind === InstructionKind.Reassign && |
| 3997 | (elements.some(element => !element.isIdentifier()) || |
| 3998 | elements.some( |
| 3999 | element => |
| 4000 | element.isIdentifier() && |
| 4001 | (getStoreKind(builder, element) !== 'StoreLocal' || |
| 4002 | builder.resolveIdentifier(element).kind !== 'Identifier'), |
| 4003 | )); |
| 4004 | for (let i = 0; i < elements.length; i++) { |
| 4005 | const element = elements[i]; |
| 4006 | if (element.node == null) { |
| 4007 | items.push({ |
| 4008 | kind: 'Hole', |
| 4009 | }); |
| 4010 | continue; |
| 4011 | } |
| 4012 | if (element.isRestElement()) { |
| 4013 | const argument = element.get('argument'); |
| 4014 | if ( |
| 4015 | argument.isIdentifier() && |
| 4016 | !forceTemporaries && |
| 4017 | (assignmentKind === 'Assignment' || |
| 4018 | getStoreKind(builder, argument) === 'StoreLocal') |
| 4019 | ) { |
| 4020 | const identifier = lowerIdentifierForAssignment( |
| 4021 | builder, |
| 4022 | element.node.loc ?? GeneratedSource, |
| 4023 | kind, |
| 4024 | argument, |
| 4025 | ); |
| 4026 | if (identifier === null) { |
| 4027 | continue; |
| 4028 | } else if (identifier.kind === 'Global') { |
| 4029 | builder.recordError( |
| 4030 | new CompilerErrorDetail({ |
| 4031 | category: ErrorCategory.Todo, |
| 4032 | reason: |
| 4033 | 'Expected reassignment of globals to enable forceTemporaries', |
| 4034 | loc: element.node.loc ?? GeneratedSource, |
| 4035 | }), |
| 4036 | ); |
| 4037 | continue; |
| 4038 | } |
| 4039 | items.push({ |
| 4040 | kind: 'Spread', |
| 4041 | place: identifier, |
| 4042 | }); |
| 4043 | } else { |
| 4044 | const temp = buildTemporaryPlace( |
| 4045 | builder, |
| 4046 | element.node.loc ?? GeneratedSource, |
| 4047 | ); |
| 4048 | promoteTemporary(temp.identifier); |
| 4049 | items.push({ |
| 4050 | kind: 'Spread', |
| 4051 | place: {...temp}, |
| 4052 | }); |
| 4053 | followups.push({place: temp, path: argument as NodePath<t.LVal>}); // TODO remove type cast |
| 4054 | } |
| 4055 | } else if ( |
| 4056 | element.isIdentifier() && |
| 4057 | !forceTemporaries && |
| 4058 | (assignmentKind === 'Assignment' || |
| 4059 | getStoreKind(builder, element) === 'StoreLocal') |
| 4060 | ) { |
| 4061 | const identifier = lowerIdentifierForAssignment( |
| 4062 | builder, |
| 4063 | element.node.loc ?? GeneratedSource, |
| 4064 | kind, |
| 4065 | element, |
| 4066 | ); |
| 4067 | if (identifier === null) { |
| 4068 | continue; |
| 4069 | } else if (identifier.kind === 'Global') { |
| 4070 | builder.recordError( |
| 4071 | new CompilerErrorDetail({ |
| 4072 | category: ErrorCategory.Todo, |
| 4073 | reason: |
| 4074 | 'Expected reassignment of globals to enable forceTemporaries', |
| 4075 | loc: element.node.loc ?? GeneratedSource, |
| 4076 | }), |
| 4077 | ); |
| 4078 | continue; |
| 4079 | } |
| 4080 | items.push(identifier); |
| 4081 | } else { |
| 4082 | const temp = buildTemporaryPlace( |
| 4083 | builder, |
| 4084 | element.node.loc ?? GeneratedSource, |
| 4085 | ); |
| 4086 | promoteTemporary(temp.identifier); |
| 4087 | items.push({...temp}); |
| 4088 | followups.push({place: temp, path: element as NodePath<t.LVal>}); // TODO remove type cast |
| 4089 | } |
| 4090 | } |
| 4091 | const temporary = lowerValueToTemporary(builder, { |
| 4092 | kind: 'Destructure', |
| 4093 | lvalue: { |
| 4094 | kind, |
| 4095 | pattern: { |
| 4096 | kind: 'ArrayPattern', |
| 4097 | items, |
| 4098 | loc: lvalue.node.loc ?? GeneratedSource, |
| 4099 | }, |
| 4100 | }, |
| 4101 | value, |
| 4102 | loc, |
| 4103 | }); |
| 4104 | for (const {place, path} of followups) { |
| 4105 | lowerAssignment( |
| 4106 | builder, |
| 4107 | path.node.loc ?? loc, |
| 4108 | kind, |
| 4109 | path, |
| 4110 | place, |
| 4111 | assignmentKind, |
| 4112 | ); |
| 4113 | } |
| 4114 | return {kind: 'LoadLocal', place: temporary, loc: value.loc}; |
| 4115 | } |
| 4116 | case 'ObjectPattern': { |
| 4117 | const lvalue = lvaluePath as NodePath<t.ObjectPattern>; |
| 4118 | const propertiesPaths = lvalue.get('properties'); |
| 4119 | const properties: ObjectPattern['properties'] = []; |
| 4120 | const followups: Array<{place: Place; path: NodePath<t.LVal>}> = []; |
| 4121 | /* |
| 4122 | * A given destructuring statement must contain all declarations or all |
| 4123 | * reassignments. This is enforced by the parser, but we rewrite nested |
| 4124 | * destructuring into assignment to a temporary. Therefore, if we see |
| 4125 | * any reassignments that are nested destructuring we fall back to |
| 4126 | * using temporaries for all variables, and emitting the actual reassignments |
| 4127 | * in follow-up statements |
| 4128 | */ |
| 4129 | const forceTemporaries = |
| 4130 | kind === InstructionKind.Reassign && |
| 4131 | propertiesPaths.some( |
| 4132 | property => |
| 4133 | property.isRestElement() || |
| 4134 | (property.isObjectProperty() && |
| 4135 | (!property.get('value').isIdentifier() || |
| 4136 | builder.resolveIdentifier( |
| 4137 | property.get('value') as NodePath<t.Identifier>, |
| 4138 | ).kind !== 'Identifier')), |
| 4139 | ); |
| 4140 | for (let i = 0; i < propertiesPaths.length; i++) { |
| 4141 | const property = propertiesPaths[i]; |
| 4142 | if (property.isRestElement()) { |
| 4143 | const argument = property.get('argument'); |
| 4144 | if (!argument.isIdentifier()) { |
| 4145 | builder.recordError( |
| 4146 | new CompilerErrorDetail({ |
| 4147 | reason: `(BuildHIR::lowerAssignment) Handle ${argument.node.type} rest element in ObjectPattern`, |
| 4148 | category: ErrorCategory.Todo, |
| 4149 | loc: argument.node.loc ?? null, |
| 4150 | suggestions: null, |
| 4151 | }), |
| 4152 | ); |
| 4153 | continue; |
| 4154 | } |
| 4155 | if ( |
| 4156 | forceTemporaries || |
| 4157 | getStoreKind(builder, argument) === 'StoreContext' |
| 4158 | ) { |
| 4159 | const temp = buildTemporaryPlace( |
| 4160 | builder, |
| 4161 | property.node.loc ?? GeneratedSource, |
| 4162 | ); |
| 4163 | promoteTemporary(temp.identifier); |
| 4164 | properties.push({ |
| 4165 | kind: 'Spread', |
| 4166 | place: {...temp}, |
| 4167 | }); |
| 4168 | followups.push({place: temp, path: argument as NodePath<t.LVal>}); // TODO remove type cast |
| 4169 | } else { |
| 4170 | const identifier = lowerIdentifierForAssignment( |
| 4171 | builder, |
| 4172 | property.node.loc ?? GeneratedSource, |
| 4173 | kind, |
| 4174 | argument, |
| 4175 | ); |
| 4176 | if (identifier === null) { |
| 4177 | continue; |
| 4178 | } else if (identifier.kind === 'Global') { |
| 4179 | builder.recordError( |
| 4180 | new CompilerErrorDetail({ |
| 4181 | category: ErrorCategory.Todo, |
| 4182 | reason: |
| 4183 | 'Expected reassignment of globals to enable forceTemporaries', |
| 4184 | loc: property.node.loc ?? GeneratedSource, |
| 4185 | }), |
| 4186 | ); |
| 4187 | continue; |
| 4188 | } |
| 4189 | properties.push({ |
| 4190 | kind: 'Spread', |
| 4191 | place: identifier, |
| 4192 | }); |
| 4193 | } |
| 4194 | } else { |
| 4195 | // TODO: this should always be true given the if/else |
| 4196 | if (!property.isObjectProperty()) { |
| 4197 | builder.recordError( |
| 4198 | new CompilerErrorDetail({ |
| 4199 | reason: `(BuildHIR::lowerAssignment) Handle ${property.type} properties in ObjectPattern`, |
| 4200 | category: ErrorCategory.Todo, |
| 4201 | loc: property.node.loc ?? null, |
| 4202 | suggestions: null, |
| 4203 | }), |
| 4204 | ); |
| 4205 | continue; |
| 4206 | } |
| 4207 | if (property.node.computed) { |
| 4208 | builder.recordError( |
| 4209 | new CompilerErrorDetail({ |
| 4210 | reason: `(BuildHIR::lowerAssignment) Handle computed properties in ObjectPattern`, |
| 4211 | category: ErrorCategory.Todo, |
| 4212 | loc: property.node.loc ?? null, |
| 4213 | suggestions: null, |
| 4214 | }), |
| 4215 | ); |
| 4216 | continue; |
| 4217 | } |
| 4218 | const loweredKey = lowerObjectPropertyKey(builder, property); |
| 4219 | if (!loweredKey) { |
| 4220 | continue; |
| 4221 | } |
| 4222 | const element = property.get('value'); |
| 4223 | if (!element.isLVal()) { |
| 4224 | builder.recordError( |
| 4225 | new CompilerErrorDetail({ |
| 4226 | reason: `(BuildHIR::lowerAssignment) Expected object property value to be an LVal, got: ${element.type}`, |
| 4227 | category: ErrorCategory.Todo, |
| 4228 | loc: element.node.loc ?? null, |
| 4229 | suggestions: null, |
| 4230 | }), |
| 4231 | ); |
| 4232 | continue; |
| 4233 | } |
| 4234 | if ( |
| 4235 | element.isIdentifier() && |
| 4236 | !forceTemporaries && |
| 4237 | (assignmentKind === 'Assignment' || |
| 4238 | getStoreKind(builder, element) === 'StoreLocal') |
| 4239 | ) { |
| 4240 | const identifier = lowerIdentifierForAssignment( |
| 4241 | builder, |
| 4242 | element.node.loc ?? GeneratedSource, |
| 4243 | kind, |
| 4244 | element, |
| 4245 | ); |
| 4246 | if (identifier === null) { |
| 4247 | continue; |
| 4248 | } else if (identifier.kind === 'Global') { |
| 4249 | builder.recordError( |
| 4250 | new CompilerErrorDetail({ |
| 4251 | category: ErrorCategory.Todo, |
| 4252 | reason: |
| 4253 | 'Expected reassignment of globals to enable forceTemporaries', |
| 4254 | loc: element.node.loc ?? GeneratedSource, |
| 4255 | }), |
| 4256 | ); |
| 4257 | continue; |
| 4258 | } |
| 4259 | properties.push({ |
| 4260 | kind: 'ObjectProperty', |
| 4261 | type: 'property', |
| 4262 | place: identifier, |
| 4263 | key: loweredKey, |
| 4264 | }); |
| 4265 | } else { |
| 4266 | const temp = buildTemporaryPlace( |
| 4267 | builder, |
| 4268 | element.node.loc ?? GeneratedSource, |
| 4269 | ); |
| 4270 | promoteTemporary(temp.identifier); |
| 4271 | properties.push({ |
| 4272 | kind: 'ObjectProperty', |
| 4273 | type: 'property', |
| 4274 | place: {...temp}, |
| 4275 | key: loweredKey, |
| 4276 | }); |
| 4277 | followups.push({place: temp, path: element as NodePath<t.LVal>}); // TODO remove type cast |
| 4278 | } |
| 4279 | } |
| 4280 | } |
| 4281 | const temporary = lowerValueToTemporary(builder, { |
| 4282 | kind: 'Destructure', |
| 4283 | lvalue: { |
| 4284 | kind, |
| 4285 | pattern: { |
| 4286 | kind: 'ObjectPattern', |
| 4287 | properties, |
| 4288 | loc: lvalue.node.loc ?? GeneratedSource, |
| 4289 | }, |
| 4290 | }, |
| 4291 | value, |
| 4292 | loc, |
| 4293 | }); |
| 4294 | for (const {place, path} of followups) { |
| 4295 | lowerAssignment( |
| 4296 | builder, |
| 4297 | path.node.loc ?? loc, |
| 4298 | kind, |
| 4299 | path, |
| 4300 | place, |
| 4301 | assignmentKind, |
| 4302 | ); |
| 4303 | } |
| 4304 | return {kind: 'LoadLocal', place: temporary, loc: value.loc}; |
| 4305 | } |
| 4306 | case 'AssignmentPattern': { |
| 4307 | const lvalue = lvaluePath as NodePath<t.AssignmentPattern>; |
| 4308 | const loc = lvalue.node.loc ?? GeneratedSource; |
| 4309 | const temp = buildTemporaryPlace(builder, loc); |
| 4310 | |
| 4311 | const testBlock = builder.reserve('value'); |
| 4312 | const continuationBlock = builder.reserve(builder.currentBlockKind()); |
| 4313 | |
| 4314 | const consequent = builder.enter('value', () => { |
| 4315 | /* |
| 4316 | * Because we reorder evaluation, we restrict the allowed default values to those where |
| 4317 | * evaluation order is unobservable |
| 4318 | */ |
| 4319 | const defaultValue = lowerReorderableExpression( |
| 4320 | builder, |
| 4321 | lvalue.get('right'), |
| 4322 | ); |
| 4323 | lowerValueToTemporary(builder, { |
| 4324 | kind: 'StoreLocal', |
| 4325 | lvalue: {kind: InstructionKind.Const, place: {...temp}}, |
| 4326 | value: {...defaultValue}, |
| 4327 | type: null, |
| 4328 | loc, |
| 4329 | }); |
| 4330 | return { |
| 4331 | kind: 'goto', |
| 4332 | variant: GotoVariant.Break, |
| 4333 | block: continuationBlock.id, |
| 4334 | id: makeInstructionId(0), |
| 4335 | loc, |
| 4336 | }; |
| 4337 | }); |
| 4338 | |
| 4339 | const alternate = builder.enter('value', () => { |
| 4340 | lowerValueToTemporary(builder, { |
| 4341 | kind: 'StoreLocal', |
| 4342 | lvalue: {kind: InstructionKind.Const, place: {...temp}}, |
| 4343 | value: {...value}, |
| 4344 | type: null, |
| 4345 | loc, |
| 4346 | }); |
| 4347 | return { |
| 4348 | kind: 'goto', |
| 4349 | variant: GotoVariant.Break, |
| 4350 | block: continuationBlock.id, |
| 4351 | id: makeInstructionId(0), |
| 4352 | loc, |
| 4353 | }; |
| 4354 | }); |
| 4355 | builder.terminateWithContinuation( |
| 4356 | { |
| 4357 | kind: 'ternary', |
| 4358 | test: testBlock.id, |
| 4359 | fallthrough: continuationBlock.id, |
| 4360 | id: makeInstructionId(0), |
| 4361 | loc, |
| 4362 | }, |
| 4363 | testBlock, |
| 4364 | ); |
| 4365 | const undef = lowerValueToTemporary(builder, { |
| 4366 | kind: 'Primitive', |
| 4367 | value: undefined, |
| 4368 | loc, |
| 4369 | }); |
| 4370 | const test = lowerValueToTemporary(builder, { |
| 4371 | kind: 'BinaryExpression', |
| 4372 | left: {...value}, |
| 4373 | operator: '===', |
| 4374 | right: {...undef}, |
| 4375 | loc, |
| 4376 | }); |
| 4377 | builder.terminateWithContinuation( |
| 4378 | { |
| 4379 | kind: 'branch', |
| 4380 | test: {...test}, |
| 4381 | consequent, |
| 4382 | alternate, |
| 4383 | fallthrough: continuationBlock.id, |
| 4384 | id: makeInstructionId(0), |
| 4385 | loc, |
| 4386 | }, |
| 4387 | continuationBlock, |
| 4388 | ); |
| 4389 | |
| 4390 | return lowerAssignment( |
| 4391 | builder, |
| 4392 | loc, |
| 4393 | kind, |
| 4394 | lvalue.get('left'), |
| 4395 | temp, |
| 4396 | assignmentKind, |
| 4397 | ); |
| 4398 | } |
| 4399 | default: { |
| 4400 | builder.recordError( |
| 4401 | new CompilerErrorDetail({ |
| 4402 | reason: `(BuildHIR::lowerAssignment) Handle ${lvaluePath.type} assignments`, |
| 4403 | category: ErrorCategory.Todo, |
| 4404 | loc: lvaluePath.node.loc ?? null, |
| 4405 | suggestions: null, |
| 4406 | }), |
| 4407 | ); |
| 4408 | return {kind: 'UnsupportedNode', node: lvalueNode, loc}; |
| 4409 | } |
| 4410 | } |
| 4411 | } |
| 4412 | |
| 4413 | function captureScopes({from, to}: {from: Scope; to: Scope}): Set<Scope> { |
| 4414 | let scopes: Set<Scope> = new Set(); |
| 4415 | while (from) { |
| 4416 | scopes.add(from); |
| 4417 | |
| 4418 | if (from === to) { |
| 4419 | break; |
| 4420 | } |
| 4421 | |
| 4422 | from = from.parent; |
| 4423 | } |
| 4424 | return scopes; |
| 4425 | } |
| 4426 | |
| 4427 | /** |
| 4428 | * Returns a mapping of "context" identifiers — references to free variables that |
| 4429 | * will become part of the function expression's `context` array — along with the |
| 4430 | * source location of their first reference within the function. |
| 4431 | */ |
| 4432 | function gatherCapturedContext( |
| 4433 | fn: NodePath< |
| 4434 | | t.FunctionExpression |
| 4435 | | t.ArrowFunctionExpression |
| 4436 | | t.FunctionDeclaration |
| 4437 | | t.ObjectMethod |
| 4438 | >, |
| 4439 | componentScope: Scope, |
| 4440 | ): Map<t.Identifier, SourceLocation> { |
| 4441 | const capturedIds = new Map<t.Identifier, SourceLocation>(); |
| 4442 | |
| 4443 | /* |
| 4444 | * Capture all the scopes from the parent of this function up to and including |
| 4445 | * the component scope. |
| 4446 | */ |
| 4447 | const pureScopes: Set<Scope> = captureScopes({ |
| 4448 | from: fn.scope.parent, |
| 4449 | to: componentScope, |
| 4450 | }); |
| 4451 | |
| 4452 | function handleMaybeDependency( |
| 4453 | path: NodePath<t.Identifier> | NodePath<t.JSXOpeningElement>, |
| 4454 | ): void { |
| 4455 | // Base context variable to depend on |
| 4456 | let baseIdentifier: NodePath<t.Identifier> | NodePath<t.JSXIdentifier>; |
| 4457 | if (path.isJSXOpeningElement()) { |
| 4458 | const name = path.get('name'); |
| 4459 | if (!(name.isJSXMemberExpression() || name.isJSXIdentifier())) { |
| 4460 | // TODO: should JSX namespaced names be handled here as well? |
| 4461 | return; |
| 4462 | } |
| 4463 | let current: NodePath<t.JSXMemberExpression | t.JSXIdentifier> = name; |
| 4464 | while (current.isJSXMemberExpression()) { |
| 4465 | current = current.get('object'); |
| 4466 | } |
| 4467 | invariant( |
| 4468 | current.isJSXIdentifier(), |
| 4469 | 'Invalid logic in gatherCapturedDeps', |
| 4470 | ); |
| 4471 | baseIdentifier = current; |
| 4472 | } else { |
| 4473 | baseIdentifier = path; |
| 4474 | } |
| 4475 | |
| 4476 | /* |
| 4477 | * Skip dependency path, as we already tried to recursively add it (+ all subexpressions) |
| 4478 | * as a dependency. |
| 4479 | */ |
| 4480 | path.skip(); |
| 4481 | |
| 4482 | // Add the base identifier binding as a dependency. |
| 4483 | const binding = baseIdentifier.scope.getBinding(baseIdentifier.node.name); |
| 4484 | if ( |
| 4485 | binding !== undefined && |
| 4486 | pureScopes.has(binding.scope) && |
| 4487 | !capturedIds.has(binding.identifier) |
| 4488 | ) { |
| 4489 | capturedIds.set( |
| 4490 | binding.identifier, |
| 4491 | path.node.loc ?? binding.identifier.loc ?? GeneratedSource, |
| 4492 | ); |
| 4493 | } |
| 4494 | } |
| 4495 | |
| 4496 | fn.traverse({ |
| 4497 | TypeAnnotation(path) { |
| 4498 | path.skip(); |
| 4499 | }, |
| 4500 | TSTypeAnnotation(path) { |
| 4501 | path.skip(); |
| 4502 | }, |
| 4503 | TypeAlias(path) { |
| 4504 | path.skip(); |
| 4505 | }, |
| 4506 | TSTypeAliasDeclaration(path) { |
| 4507 | path.skip(); |
| 4508 | }, |
| 4509 | Expression(path) { |
| 4510 | if (path.isAssignmentExpression()) { |
| 4511 | /* |
| 4512 | * Babel has a bug where it doesn't visit the LHS of an |
| 4513 | * AssignmentExpression if it's an Identifier. Work around it by explicitly |
| 4514 | * visiting it. |
| 4515 | */ |
| 4516 | const left = path.get('left'); |
| 4517 | if (left.isIdentifier()) { |
| 4518 | handleMaybeDependency(left); |
| 4519 | } |
| 4520 | return; |
| 4521 | } else if (path.isJSXElement()) { |
| 4522 | handleMaybeDependency(path.get('openingElement')); |
| 4523 | } else if (path.isIdentifier()) { |
| 4524 | handleMaybeDependency(path); |
| 4525 | } |
| 4526 | }, |
| 4527 | }); |
| 4528 | |
| 4529 | return capturedIds; |
| 4530 | } |
| 4531 | |
| 4532 | function notNull<T>(value: T | null): value is T { |
| 4533 | return value !== null; |
| 4534 | } |
| 4535 | |
| 4536 | export function lowerType(node: t.FlowType | t.TSType): Type { |
| 4537 | switch (node.type) { |
| 4538 | case 'GenericTypeAnnotation': { |
| 4539 | const id = node.id; |
| 4540 | if (id.type === 'Identifier' && id.name === 'Array') { |
| 4541 | return {kind: 'Object', shapeId: BuiltInArrayId}; |
| 4542 | } |
| 4543 | return makeType(); |
| 4544 | } |
| 4545 | case 'TSTypeReference': { |
| 4546 | const typeName = node.typeName; |
| 4547 | if (typeName.type === 'Identifier' && typeName.name === 'Array') { |
| 4548 | return {kind: 'Object', shapeId: BuiltInArrayId}; |
| 4549 | } |
| 4550 | return makeType(); |
| 4551 | } |
| 4552 | case 'ArrayTypeAnnotation': |
| 4553 | case 'TSArrayType': { |
| 4554 | return {kind: 'Object', shapeId: BuiltInArrayId}; |
| 4555 | } |
| 4556 | case 'BooleanLiteralTypeAnnotation': |
| 4557 | case 'BooleanTypeAnnotation': |
| 4558 | case 'NullLiteralTypeAnnotation': |
| 4559 | case 'NumberLiteralTypeAnnotation': |
| 4560 | case 'NumberTypeAnnotation': |
| 4561 | case 'StringLiteralTypeAnnotation': |
| 4562 | case 'StringTypeAnnotation': |
| 4563 | case 'TSBooleanKeyword': |
| 4564 | case 'TSNullKeyword': |
| 4565 | case 'TSNumberKeyword': |
| 4566 | case 'TSStringKeyword': |
| 4567 | case 'TSSymbolKeyword': |
| 4568 | case 'TSUndefinedKeyword': |
| 4569 | case 'TSVoidKeyword': |
| 4570 | case 'VoidTypeAnnotation': { |
| 4571 | return {kind: 'Primitive'}; |
| 4572 | } |
| 4573 | default: { |
| 4574 | return makeType(); |
| 4575 | } |
| 4576 | } |
| 4577 | } |