| 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 { |
| 9 | CompilerDiagnostic, |
| 10 | CompilerError, |
| 11 | ErrorCategory, |
| 12 | } from '../CompilerError'; |
| 13 | import {HIRFunction, IdentifierId, SourceLocation} from '../HIR'; |
| 14 | import {Result} from '../Utils/Result'; |
| 15 | |
| 16 | /** |
| 17 | * Validates against components that are created dynamically and whose identity is not guaranteed |
| 18 | * to be stable (which would cause the component to reset on each re-render). |
| 19 | */ |
| 20 | export function validateStaticComponents( |
| 21 | fn: HIRFunction, |
| 22 | ): Result<void, CompilerError> { |
| 23 | const error = new CompilerError(); |
| 24 | const knownDynamicComponents = new Map<IdentifierId, SourceLocation>(); |
| 25 | for (const block of fn.body.blocks.values()) { |
| 26 | phis: for (const phi of block.phis) { |
| 27 | for (const operand of phi.operands.values()) { |
| 28 | const loc = knownDynamicComponents.get(operand.identifier.id); |
| 29 | if (loc != null) { |
| 30 | knownDynamicComponents.set(phi.place.identifier.id, loc); |
| 31 | continue phis; |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | for (const instr of block.instructions) { |
| 36 | const {lvalue, value} = instr; |
| 37 | switch (value.kind) { |
| 38 | case 'FunctionExpression': |
| 39 | case 'NewExpression': |
| 40 | case 'MethodCall': |
| 41 | case 'CallExpression': { |
| 42 | knownDynamicComponents.set(lvalue.identifier.id, value.loc); |
| 43 | break; |
| 44 | } |
| 45 | case 'LoadLocal': { |
| 46 | const loc = knownDynamicComponents.get(value.place.identifier.id); |
| 47 | if (loc != null) { |
| 48 | knownDynamicComponents.set(lvalue.identifier.id, loc); |
| 49 | } |
| 50 | break; |
| 51 | } |
| 52 | case 'StoreLocal': { |
| 53 | const loc = knownDynamicComponents.get(value.value.identifier.id); |
| 54 | if (loc != null) { |
| 55 | knownDynamicComponents.set(lvalue.identifier.id, loc); |
| 56 | knownDynamicComponents.set(value.lvalue.place.identifier.id, loc); |
| 57 | } |
| 58 | break; |
| 59 | } |
| 60 | case 'JsxExpression': { |
| 61 | if (value.tag.kind === 'Identifier') { |
| 62 | const location = knownDynamicComponents.get( |
| 63 | value.tag.identifier.id, |
| 64 | ); |
| 65 | if (location != null) { |
| 66 | error.pushDiagnostic( |
| 67 | CompilerDiagnostic.create({ |
| 68 | category: ErrorCategory.StaticComponents, |
| 69 | reason: 'Cannot create components during render', |
| 70 | description: `Components created during render will reset their state each time they are created. Declare components outside of render`, |
| 71 | }) |
| 72 | .withDetails({ |
| 73 | kind: 'error', |
| 74 | loc: value.tag.loc, |
| 75 | message: 'This component is created during render', |
| 76 | }) |
| 77 | .withDetails({ |
| 78 | kind: 'error', |
| 79 | loc: location, |
| 80 | message: 'The component is created during render here', |
| 81 | }), |
| 82 | ); |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | return error.asResult(); |
| 90 | } |