I'm experimenting with a new pass that sometimes creates scopes with early returns earlier in the pipeline, but there are a few passes that assume that can't happen. This PR is updating those passes just to be more resilient to help unblock experimentation.
ghstack-source-id: a9e348181d
Pull Request resolved: https://github.com/facebook/react/pull/30333
We have an experimental mode where we generate scopes for simple phi values, even if they aren't subsequently mutated. This mode was incorrectly generating scope ranges, leaving the start at 0 which is invalid. The fix is to allow non-zero identifier ranges to overwrite the scope start (rather than taking the min) if the scope start is still zero.
ghstack-source-id: ecbb04c96e
Pull Request resolved: https://github.com/facebook/react/pull/30321
---
The current version of `@babel/generator` used by playground has some bugs (see https://github.com/babel/babel/issues/10966)
```js
// Try pasting this into playground
function useFoo(a, b) {
return (a ?? b) == c;
}
// Current playground output
function useFoo(a, b) {
return a ?? b == c;
}
```
We previously locked babel library versions to be compatible with the oldest Meta internal usages. Now that both compiler and eslint plugins are bundled with rollup, this shouldn't be necessary.
ghstack-source-id: fa20d676b5
Pull Request resolved: https://github.com/facebook/react/pull/30341
---
* panicThreshold: `all_errors` -> `none`
* inject an error logger through compiler config (instead of using exceptions)
We currently report at most one lint warning per file, this lets us exhaustively report all available ones (see new
test fixture for example)
ghstack-source-id: 5299315574
Pull Request resolved: https://github.com/facebook/react/pull/30336
Summary: Compiler pass tabs are bolded when their contents have changed from previous passes; but currently the HIR and JS tabs are unbolded. Conceptually they should be, if HIR is "changed" from the source code and JS is "changed" from the last IR phase.
In addition, the "show diff" option doesn't make a ton of sense for tabs that either aren't part of the pipeline (EnvironmentConfig) or (maybe more controversially, but imo) passes where the IR representation has changed since the last pass (BuildReactiveFunctions). This diff drops the button from those tabs.
ghstack-source-id: 1d67e2f371
Pull Request resolved: https://github.com/facebook/react/pull/30151
Summary: The playground currently has limited support for Flow files--it tries to parse them if the // flow sigil is on the fist line, but this is often not the case for files one would like to inspect in practice. more importantly, component syntax isn't supported even then, because it depends on the Hermes parser.
This diff improves the state of flow support in the playground to make it more useful: when we see `flow` anywhere in the file, we'll assume it's a flow file, parse it with the Hermes parser, and disable typescript-specific features of Monaco editor.
ghstack-source-id: b99b1568d7
Pull Request resolved: https://github.com/facebook/react/pull/30150
Summary: In change-detection mode, we previously were spreading the contents of the computation block into the result twice. Other babel passes that cause in-place mutations of the AST would then be causing action at a distance and breaking the overall transform result. This pr creates clones of the nodes instead, so that mutations aren't reflected in both places where the block is used.
ghstack-source-id: b78def8d8d
Pull Request resolved: https://github.com/facebook/react/pull/30148
Adds a pass which validates that local variables are not reassigned by functions which may be called after render. This is a straightforward forward data-flow analysis, where we:
1. Build up a mapping of context variables in the outer component/hook
2. Find ObjectMethod/FunctionExpressions which may reassign those context variables
3. Propagate aliases of those functions via StoreLocal/LoadLocal
4. Disallow passing those functions with a Freeze effect. This includes JSX arguments, hook arguments, hook return types, etc.
Conceptually, a function that reassigns a local is inherently mutable. Frozen functions must be side-effect free, so these two categories are incompatible and we can use the freeze effect to find all instances of where such functions are disallowed rather than special-casing eg hook calls and JSX.
ghstack-source-id: c2b22e3d62
Pull Request resolved: https://github.com/facebook/react/pull/30107
Currently, the `hookKind` for `useInsertionEffect` is set to
`useLayoutEffect`. This pull request fixes it by adding a new `hookKind`
for `useInsertionEffect`.
Double checked by syncing internally and verifying the # of `visitInstruction` calls with unique `InstructionId`s.
This is a bit of an awkward pattern though. A cleaner alternative might be to override `visitValue` and store its results in a sidemap (instead of returning)
ghstack-source-id: f6797d7652
Pull Request resolved: https://github.com/facebook/react/pull/30077
Adds Array.prototype methods that return primitives or other arrays -- naive type inference can be really helpful in reducing mutable ranges -> achieving higher quality memoization.
Also copies Array.prototype methods to our mixed read-only JSON-like object shape.
(Inspired after going through some suboptimal internal compilation outputs.)
ghstack-source-id: 0bfad11180
Pull Request resolved: https://github.com/facebook/react/pull/30075
Our previous logic for aligning scopes to block scopes constructs a tree of block and scope nodes. We ensured that blocks always mapped to the same node as their fallthroughs. e.g.
```js
// source
a();
if (...) {
b();
}
c();
// HIR
bb0:
a()
if test=... consequent=bb1 fallthrough=bb2
bb1:
b()
goto bb2
bb2:
c()
// AlignReactiveScopesToBlockScopesHIR nodes
Root node (maps to both bb0 and bb2)
|- bb1
|- ...
```
There are two issues with the existing implementation:
1. Only scopes that overlap with the beginning of a block are aligned correctly. This is because the traversal does not store information about the block-fallthrough pair for scopes that begin *within* the block-fallthrough range.
```
\# This case gets handled correctly
┌──────────────┐
│ │
block start block end
scope start scope end
│ │
└───────────────┘
\# But not this one!
┌──────────────┐
│ │
block start block end
scope start scope end
│ │
└───────────────┘
```
2. Only scopes that are directly used by a block is considered. See the `align-scopes-nested-block-structure` fixture for details.
ghstack-source-id: 327dec5019
Pull Request resolved: https://github.com/facebook/react/pull/29891
ghstack-source-id: 04b1526c85
Pull Request resolved: https://github.com/facebook/react/pull/29878
The AlignReactiveScope bug should be simplest to fix, but it's also caught by an invariant assertion. I think a fix could be either keeping track of "active" block-fallthrough pairs (`retainWhere(pair => pair.range.end > current.instr[0].id)`) or following the approach in `assertValidBlockNesting`.
I'm tempted to pull the value-block aligning logic out into its own pass (using the current `node` tree traversal), then align to non-value blocks with the `assertValidBlockNesting` approach. Happy to hear feedback on this though!
The other two are likely bigger issues, as they're not caught by static invariants.
Update:
- removed bug-phi-reference-effect as it's been patched by @josephsavona
- added bug-array-concat-should-capture
With this, we can set a `debugger` breakpoint and we'll break into the
source code when running tests with snap. Without this, we'd break into
the transpiled js code.
When converting value blocks from HIR to ReactiveFunction, we have to drop StoreLocal assignments that represent the assignment of the phi, since ReactiveFunction supports compound expressions. These StoreLocals are only present to represent the conditional assignment of the value itself - but it's also possible for the expression to have contained an assignment expression. Before, in trying to strip the first category of StoreLocal we also accidentally stripped the second category. Now we check that the assignment is for a temporary, and don't strip otherwise.
ghstack-source-id: e7759c963b
Pull Request resolved: https://github.com/facebook/react/pull/30067
Adds a fixture based on internal case where our current output is quite a bit more verbose than the original memoization. See the comment in the fixture for more about the heuristic we can apply.
ghstack-source-id: e637a38140
Pull Request resolved: https://github.com/facebook/react/pull/29998
Note: due to a bad rebase i included #29883 here. Both were stamped so i'm not gonna bother splitting it back up aain.
This PR includes two changes:
* First, allow `LoadLocal` to be reordered if a) the load occurs after the last write to a variable and b) the LoadLocal lvalue is used exactly once
* Uses a more optimal reordering for statement blocks, while keeping the existing approach for expression blocks.
In #29863 I tried to find a clean way to share code for emitting instructions between value blocks and regular blocks. The catch is that value blocks have special meaning for their final instruction — that's the value of the block — so reordering can't change the last instruction. However, in finding a clean way to share code for these two categories of code, i also inadvertently reduced the effectiveness of the optimization.
This PR updates to use different strategies for these two kinds of blocks: value blocks use the code from #29863 where we first emit all non-reorderable instructions in their original order, then try to emit reorderable values. The reason this is suboptimal, though, is that we want to move instructions closer to their dependencies so that they can invalidate (merge) together. Emitting the reorderable values last prevents this.
So for normal blocks, we now emit terminal operands first. This will invariably cause some of the non-reorderable instructions to be emitted, but it will intersperse reoderable instructions in between, right after their dependencies. This maximizes our ability to merge scopes.
I think the complexity cost of two strategies is worth the benefit, as evidenced by the reduced memo slots in the fixtures.
ghstack-source-id: ad3e516fa4
Pull Request resolved: https://github.com/facebook/react/pull/29882
Merges the existing config to the root one so we can have a single
configuration file. I've tried to keep the compiler config as much as
possible in this PR so that no formatting changes occur.
ghstack-source-id: 8bbfc9f269
Pull Request resolved: https://github.com/facebook/react/pull/30021
This PR extends the previous logic added in #29141 to also account for
other kinds of non-ascii characters such as `\n`. Because these control
characters are individual special characters (and not 2 characters `\`
and `n`) we match based on unicode which was already being checked for
non-Latin characters.
This allows control characters to continue to be compiled equivalently
to its original source if it was provided in a JsxExpressionContainer.
However note that this PR does not convert JSX attributes that are
StringLiterals to JsxExpressionContainer, to preserve the original
source code as it was written.
Alternatively we could always emit a JsxExpressionContainer if it was
used in the source and not try to down level it to some other node
kind. But since we already do this I opted to keep this behavior.
Partially addresses #29648.
ghstack-source-id: ecc61c9f0b
Pull Request resolved: https://github.com/facebook/react/pull/29997
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## Summary
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does the pull request solve?
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I have fixed an issue where the display of the HIR diff in the React
Compiler Playground was incorrect. The HIR diff is supposed to show the
pre-change state as the source, but currently, it is showing
EnvironmentConfig as the pre-change state. This PR corrects this by
setting the pre-change state to source instead of EnvironmentConfig.
## How did you test this change?
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before:
after:
If a component uses the `useRef` hook directly then we type it's return
value as a ref. But if it's wrapped in a custom hook then we lose out on
this type information as the compiler doesn't look at the hook
definition. This has resulted in some false positives in our analysis
like the ones reported in #29160 and #29196.
This PR will treat objects named as `ref` or if their names end with the
substring `Ref`, and contain a property named `current`, as React refs.
```
const ref = useMyRef();
const myRef = useMyRef2();
useEffect(() => {
ref.current = ...;
myRef.current = ...;
})
```
In the above example, `ref` and `myRef` will be treated as React refs.
Updated version of #29758 removing `useFormState` since that was the
previous name for `useActionState`.
---------
Co-authored-by: Hieu Do <hieudn.uh@gmail.com>
Adds fixtures for `macro.namespace(...)` style invocations which we use internally in some cases instead of just `macro(...)`. I tried every example i could think of that could possibly break it (including basing one off of another fixture where we hit an invariant related due to a temporary being emitted for a method call), and they all worked. I just had to fix an existing bug where we early return in some cases instead of continuing, which is a holdover from when this pass was originally written as a ReactiveFunction visitor.
ghstack-source-id: c01f45b3ef
Pull Request resolved: https://github.com/facebook/react/pull/29899
Adds a pass just after DCE to reorder safely reorderable instructions (jsx, primitives, globals) closer to where they are used, to allow other optimization passes to be more effective. Notably, the reordering allows scope merging to be more effective, since that pass relies on two scopes not having intervening instructions — in many cases we can now reorder such instructions out of the way and unlock merging, as demonstrated in the changed fixtures.
The algorithm itself is described in the docblock.
note: This is a cleaned up version of #29579 that is ready for review.
ghstack-source-id: c54a806cad
Pull Request resolved: https://github.com/facebook/react/pull/29863
Updates our scope merging pass to allow more types of instructions to intervene btw scopes. This includes all the non-allocating kinds of nodes that are considered reorderable in #29863. It's already safe to merge scopes with these instructions — we only merge if the lvalue is not used past the next scope. Additionally, without changing this pass reordering isn't very effective, since we would reorder to add these types of intervening instructions and then not be able to merge scopes.
Sequencing this first helps to see the win just from reordering alone.
ghstack-source-id: 79263576d8
Pull Request resolved: https://github.com/facebook/react/pull/29881
Summary: The change detection mode was unavailable in the playground because the pragma was not a boolean. This fixes that by special casing it in pragma parsing, similar to validateNoCapitalizedCalls
ghstack-source-id: 4a8c17d21a
Pull Request resolved: https://github.com/facebook/react/pull/29889
Our passes aren't sequenced such that we could observe this bug, but this retains the proper terminal kind for pruned-scopes in mapTerminalSuccessors.
ghstack-source-id: 1a03b40e45
Pull Request resolved: https://github.com/facebook/react/pull/29884
Summary: Minor change inspired by #29863: the BuildHIR pass ensures that Binary and UnaryOperator nodes only use a limited set of the operators that babel's operator types represent, which that pr relies on for safe reorderability, but the type of those HIR nodes admits the other operators. For example, even though you can't build an HIR UnaryOperator with `delete` as the operator, it is a valid HIR node--and if we made a mistaken change that let you build such a node, it would be unsafe to reorder.
This pr makes the typing of operators stricter to prevent that.
ghstack-source-id: 9bf3b1a37e
Pull Request resolved: https://github.com/facebook/react/pull/29880
Fixes a bug found by mofeiZ in #29878. When we merge queued states, if the new state does not introduce changes relative to the queued state we should use the queued state, not the new state.
ghstack-source-id: c59f69de15
Pull Request resolved: https://github.com/facebook/react/pull/29879
Summary: We now expect that candidate components that have Flow or TS type annotations on their first parameters have annotations that are potentially objects--this lets us reject compiling functions that explicitly take e.g. `number` as a parameter.
ghstack-source-id: e2c2334826
Pull Request resolved: https://github.com/facebook/react/pull/29866
Joe Savona
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