The library for web and native user interfaces.
Mirrored from https://github.com/247TaxiDriver/QOS-React.git
Synced Nov 10, 17:45 UTC
[compiler] Add fallthrough to branch terminal
Branch terminals didn't have a fallthrough because they correspond to an outer terminal (optional, logical, etc) that has the "real" fallthrough. But understanding how branch terminals correspond to these outer terminals requires knowing the branch fallthrough. For example, `foo?.bar?.baz` creates terminals along the lines of: ``` bb0: optional fallthrough=bb4 bb1: optional fallthrough=bb3 bb2: ... branch ... (fallthrough=bb3) ... bb3: ... branch ... (fallthrough=bb4) ... bb4: ... ``` Without a fallthrough on `branch` terminals, it's unclear that the optional from bb0 has its branch node in bb3. With the fallthroughs, we can see look for a branch with the same fallthrough as the outer optional terminal to match them up. ghstack-source-id: d48c6232899864716eef71798a278b487d30eafc Pull Request resolved: https://github.com/facebook/react/pull/30814
Joe Savona committed
Aug 28, 2024 at 10:52 UTC
925c20a20674254391b7752aa216ec417c8f52a3
6 files changed
+77
-11
compiler/packages/babel-plugin-react-compiler/src/HIR/BuildHIR.ts
+10
-4
@@ -607,6 +607,7 @@ function lowerStatement(
607
),
608
consequent: bodyBlock,
609
alternate: continuationBlock.id,
610
+ fallthrough: continuationBlock.id,
611
id: makeInstructionId(0),
612
loc: stmt.node.loc ?? GeneratedSource,
613
},
@@ -656,16 +657,13 @@ function lowerStatement(
657
},
658
conditionalBlock,
659
);
659
- /*
660
- * The conditional block is empty and exists solely as conditional for
661
- * (re)entering or exiting the loop
662
- */
660
const test = lowerExpressionToTemporary(builder, stmt.get('test'));
661
const terminal: BranchTerminal = {
662
kind: 'branch',
663
test,
664
consequent: loopBlock,
665
alternate: continuationBlock.id,
666
+ fallthrough: conditionalBlock.id,
667
id: makeInstructionId(0),
668
loc: stmt.node.loc ?? GeneratedSource,
669
};
@@ -975,6 +973,7 @@ function lowerStatement(
973
test,
974
consequent: loopBlock,
975
alternate: continuationBlock.id,
976
+ fallthrough: conditionalBlock.id,
977
id: makeInstructionId(0),
978
loc,
979
};
@@ -1118,6 +1117,7 @@ function lowerStatement(
1117
consequent: loopBlock,
1118
alternate: continuationBlock.id,
1119
loc: stmt.node.loc ?? GeneratedSource,
1120
+ fallthrough: continuationBlock.id,
1121
},
1122
continuationBlock,
1123
);
@@ -1203,6 +1203,7 @@ function lowerStatement(
1203
test,
1204
consequent: loopBlock,
1205
alternate: continuationBlock.id,
1206
+ fallthrough: continuationBlock.id,
1207
loc: stmt.node.loc ?? GeneratedSource,
1208
},
1209
continuationBlock,
@@ -1800,6 +1801,7 @@ function lowerExpression(
1801
test: {...testPlace},
1802
consequent: consequentBlock,
1803
alternate: alternateBlock,
1804
+ fallthrough: continuationBlock.id,
1805
id: makeInstructionId(0),
1806
loc: exprLoc,
1807
},
@@ -1878,6 +1880,7 @@ function lowerExpression(
1880
test: {...leftPlace},
1881
consequent,
1882
alternate,
1883
+ fallthrough: continuationBlock.id,
1884
id: makeInstructionId(0),
1885
loc: exprLoc,
1886
},
@@ -2611,6 +2614,7 @@ function lowerOptionalMemberExpression(
2614
test: {...object},
2615
consequent: consequent.id,
2616
alternate,
2617
+ fallthrough: continuationBlock.id,
2618
id: makeInstructionId(0),
2619
loc,
2620
};
@@ -2750,6 +2754,7 @@ function lowerOptionalCallExpression(
2754
test: {...testPlace},
2755
consequent: consequent.id,
2756
alternate,
2757
+ fallthrough: continuationBlock.id,
2758
id: makeInstructionId(0),
2759
loc,
2760
};
@@ -4025,6 +4030,7 @@ function lowerAssignment(
4030
test: {...test},
4031
consequent,
4032
alternate,
4033
+ fallthrough: continuationBlock.id,
4034
id: makeInstructionId(0),
4035
loc,
4036
},
compiler/packages/babel-plugin-react-compiler/src/HIR/HIR.ts
+1
-1
@@ -491,7 +491,7 @@ export type BranchTerminal = {
491
alternate: BlockId;
492
id: InstructionId;
493
loc: SourceLocation;
494
- fallthrough?: never;
494
+ fallthrough: BlockId;
495
};
496
497
export type SwitchTerminal = {
compiler/packages/babel-plugin-react-compiler/src/HIR/visitors.ts
+3
-1
@@ -660,11 +660,13 @@ export function mapTerminalSuccessors(
660
case 'branch': {
661
const consequent = fn(terminal.consequent);
662
const alternate = fn(terminal.alternate);
663
+ const fallthrough = fn(terminal.fallthrough);
664
return {
665
kind: 'branch',
666
test: terminal.test,
667
consequent,
668
alternate,
669
+ fallthrough,
670
id: makeInstructionId(0),
671
loc: terminal.loc,
672
};
@@ -883,7 +885,6 @@ export function terminalHasFallthrough<
885
>(terminal: T): terminal is U {
886
switch (terminal.kind) {
887
case 'maybe-throw':
886
- case 'branch':
888
case 'goto':
889
case 'return':
890
case 'throw':
@@ -892,6 +893,7 @@ export function terminalHasFallthrough<
893
const _: undefined = terminal.fallthrough;
894
return false;
895
}
896
+ case 'branch':
897
case 'try':
898
case 'do-while':
899
case 'for-of':
compiler/packages/babel-plugin-react-compiler/src/Inference/DropManualMemoization.ts
+53
-2
@@ -42,6 +42,7 @@ type IdentifierSidemap = {
42
react: Set<IdentifierId>;
43
maybeDepsLists: Map<IdentifierId, Array<Place>>;
44
maybeDeps: Map<IdentifierId, ManualMemoDependency>;
45
+ optionals: Set<IdentifierId>;
46
};
47
48
/**
@@ -52,6 +53,7 @@ type IdentifierSidemap = {
53
export function collectMaybeMemoDependencies(
54
value: InstructionValue,
55
maybeDeps: Map<IdentifierId, ManualMemoDependency>,
56
+ optional: boolean,
57
): ManualMemoDependency | null {
58
switch (value.kind) {
59
case 'LoadGlobal': {
@@ -69,7 +71,7 @@ export function collectMaybeMemoDependencies(
71
return {
72
root: object.root,
73
// TODO: determine if the access is optional
72
- path: [...object.path, {property: value.property, optional: false}],
74
+ path: [...object.path, {property: value.property, optional}],
75
};
76
}
77
break;
@@ -162,7 +164,11 @@ function collectTemporaries(
164
break;
165
}
166
}
165
- const maybeDep = collectMaybeMemoDependencies(value, sidemap.maybeDeps);
167
+ const maybeDep = collectMaybeMemoDependencies(
168
+ value,
169
+ sidemap.maybeDeps,
170
+ sidemap.optionals.has(lvalue.identifier.id),
171
+ );
172
// We don't expect named lvalues during this pass (unlike ValidatePreservingManualMemo)
173
if (maybeDep != null) {
174
sidemap.maybeDeps.set(lvalue.identifier.id, maybeDep);
@@ -338,12 +344,14 @@ export function dropManualMemoization(func: HIRFunction): void {
344
func.env.config.validatePreserveExistingMemoizationGuarantees ||
345
func.env.config.validateNoSetStateInRender ||
346
func.env.config.enablePreserveExistingMemoizationGuarantees;
347
+ const optionals = findOptionalPlaces(func);
348
const sidemap: IdentifierSidemap = {
349
functions: new Map(),
350
manualMemos: new Map(),
351
react: new Set(),
352
maybeDeps: new Map(),
353
maybeDepsLists: new Map(),
354
+ optionals,
355
};
356
let nextManualMemoId = 0;
357
@@ -476,3 +484,46 @@ export function dropManualMemoization(func: HIRFunction): void {
484
}
485
}
486
}
487
+
488
+function findOptionalPlaces(fn: HIRFunction): Set<IdentifierId> {
489
+ const optionals = new Set<IdentifierId>();
490
+ for (const [, block] of fn.body.blocks) {
491
+ if (block.terminal.kind === 'optional') {
492
+ const optionalTerminal = block.terminal;
493
+ let testBlock = fn.body.blocks.get(block.terminal.test)!;
494
+ loop: while (true) {
495
+ const terminal = testBlock.terminal;
496
+ switch (terminal.kind) {
497
+ case 'branch': {
498
+ if (terminal.fallthrough === optionalTerminal.fallthrough) {
499
+ // found it
500
+ const consequent = fn.body.blocks.get(terminal.consequent)!;
501
+ const last = consequent.instructions.at(-1);
502
+ if (last !== undefined && last.value.kind === 'StoreLocal') {
503
+ optionals.add(last.value.value.identifier.id);
504
+ }
505
+ break loop;
506
+ } else {
507
+ testBlock = fn.body.blocks.get(terminal.fallthrough)!;
508
+ }
509
+ break;
510
+ }
511
+ case 'optional':
512
+ case 'logical':
513
+ case 'sequence':
514
+ case 'ternary': {
515
+ testBlock = fn.body.blocks.get(terminal.fallthrough)!;
516
+ break;
517
+ }
518
+ default: {
519
+ CompilerError.invariant(false, {
520
+ reason: `Unexpected terminal in optional`,
521
+ loc: terminal.loc,
522
+ });
523
+ }
524
+ }
525
+ }
526
+ }
527
+ }
528
+ return optionals;
529
+}
compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/AlignReactiveScopesToBlockScopesHIR.ts
+1
-1
@@ -140,7 +140,7 @@ export function alignReactiveScopesToBlockScopesHIR(fn: HIRFunction): void {
140
}
141
142
const fallthrough = terminalFallthrough(terminal);
143
- if (fallthrough !== null) {
143
+ if (fallthrough !== null && terminal.kind !== 'branch') {
144
/*
145
* Any currently active scopes that overlaps the block-fallthrough range
146
* need their range extended to at least the first instruction of the
compiler/packages/babel-plugin-react-compiler/src/Validation/ValidatePreservedManualMemoization.ts
+9
-2
@@ -167,7 +167,10 @@ function compareDeps(
167
168
let isSubpath = true;
169
for (let i = 0; i < Math.min(inferred.path.length, source.path.length); i++) {
170
- if (inferred.path[i].property !== source.path[i].property) {
170
+ if (
171
+ inferred.path[i].property !== source.path[i].property ||
172
+ inferred.path[i].optional !== source.path[i].optional
173
+ ) {
174
isSubpath = false;
175
break;
176
}
@@ -339,7 +342,11 @@ class Visitor extends ReactiveFunctionVisitor<VisitorState> {
342
return null;
343
}
344
default: {
342
- const dep = collectMaybeMemoDependencies(value, this.temporaries);
345
+ const dep = collectMaybeMemoDependencies(
346
+ value,
347
+ this.temporaries,
348
+ false,
349
+ );
350
if (value.kind === 'StoreLocal' || value.kind === 'StoreContext') {
351
const storeTarget = value.lvalue.place;
352
state.manualMemoState?.decls.add(