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[compiler][hir-rewrite] Check mutability of base identifier when hois…
…ting (#31032) Stack from [ghstack](https://github.com/ezyang/ghstack) (oldest at bottom): * #31066 * __->__ #31032 Prior to this PR, we check whether the property load source (e.g. the evaluation of `<base>` in `<base>.property`) is mutable + scoped to determine whether the property load itself is eligible for hoisting. This changes to check the base identifier of the load. - This is needed for the next PR #31066. We want to evaluate whether the base identifier is mutable within the context of the *outermost function*. This is because all LoadLocals and PropertyLoads within a nested function declaration have mutable-ranges within the context of the function, but the base identifier is a context variable. - A side effect is that we no longer infer loads from props / other function arguments as mutable in edge cases (e.g. props escaping out of try-blocks or being assigned to context variables)
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65 changes: 65 additions & 0 deletions
65
...r/src/__tests__/fixtures/compiler/bug-try-catch-maybe-null-dependency.expect.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
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| ## Input | ||
|
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| ```javascript | ||
| import {identity} from 'shared-runtime'; | ||
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| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject: {value: {inner: number}} | null) { | ||
| const y = []; | ||
| try { | ||
| y.push(identity(maybeNullObject.value.inner)); | ||
| } catch { | ||
| y.push('null'); | ||
| } | ||
|
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| return y; | ||
| } | ||
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| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, {value: 2}, {value: 3}, null], | ||
| }; | ||
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| ``` | ||
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| ## Code | ||
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| ```javascript | ||
| import { c as _c } from "react/compiler-runtime"; | ||
| import { identity } from "shared-runtime"; | ||
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| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject) { | ||
| const $ = _c(2); | ||
| let y; | ||
| if ($[0] !== maybeNullObject.value.inner) { | ||
| y = []; | ||
| try { | ||
| y.push(identity(maybeNullObject.value.inner)); | ||
| } catch { | ||
| y.push("null"); | ||
| } | ||
| $[0] = maybeNullObject.value.inner; | ||
| $[1] = y; | ||
| } else { | ||
| y = $[1]; | ||
| } | ||
| return y; | ||
| } | ||
|
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| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, { value: 2 }, { value: 3 }, null], | ||
| }; | ||
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| ``` | ||
22 changes: 22 additions & 0 deletions
22
...gin-react-compiler/src/__tests__/fixtures/compiler/bug-try-catch-maybe-null-dependency.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| import {identity} from 'shared-runtime'; | ||
|
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||
| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject: {value: {inner: number}} | null) { | ||
| const y = []; | ||
| try { | ||
| y.push(identity(maybeNullObject.value.inner)); | ||
| } catch { | ||
| y.push('null'); | ||
| } | ||
|
|
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| return y; | ||
| } | ||
|
|
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| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, {value: 2}, {value: 3}, null], | ||
| }; |
79 changes: 79 additions & 0 deletions
79
...ompiler/propagate-scope-deps-hir-fork/try-catch-maybe-null-dependency.expect.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
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| ## Input | ||
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| ```javascript | ||
| // @enablePropagateDepsInHIR | ||
| import {identity} from 'shared-runtime'; | ||
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| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject: {value: {inner: number}} | null) { | ||
| const y = []; | ||
| try { | ||
| y.push(identity(maybeNullObject.value.inner)); | ||
| } catch { | ||
| y.push('null'); | ||
| } | ||
|
|
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| return y; | ||
| } | ||
|
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| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, {value: 2}, {value: 3}, null], | ||
| }; | ||
|
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| ``` | ||
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| ## Code | ||
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| ```javascript | ||
| import { c as _c } from "react/compiler-runtime"; // @enablePropagateDepsInHIR | ||
| import { identity } from "shared-runtime"; | ||
|
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| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject) { | ||
| const $ = _c(4); | ||
| let y; | ||
| if ($[0] !== maybeNullObject) { | ||
| y = []; | ||
| try { | ||
| let t0; | ||
| if ($[2] !== maybeNullObject.value.inner) { | ||
| t0 = identity(maybeNullObject.value.inner); | ||
| $[2] = maybeNullObject.value.inner; | ||
| $[3] = t0; | ||
| } else { | ||
| t0 = $[3]; | ||
| } | ||
| y.push(t0); | ||
| } catch { | ||
| y.push("null"); | ||
| } | ||
| $[0] = maybeNullObject; | ||
| $[1] = y; | ||
| } else { | ||
| y = $[1]; | ||
| } | ||
| return y; | ||
| } | ||
|
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| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, { value: 2 }, { value: 3 }, null], | ||
| }; | ||
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| ``` | ||
| ### Eval output | ||
| (kind: ok) ["null"] | ||
| [null] | ||
| [null] | ||
| ["null"] |
23 changes: 23 additions & 0 deletions
23
...ests__/fixtures/compiler/propagate-scope-deps-hir-fork/try-catch-maybe-null-dependency.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| // @enablePropagateDepsInHIR | ||
| import {identity} from 'shared-runtime'; | ||
|
|
||
| /** | ||
| * Not safe to hoist read of maybeNullObject.value.inner outside of the | ||
| * try-catch block, as that might throw | ||
| */ | ||
| function useFoo(maybeNullObject: {value: {inner: number}} | null) { | ||
| const y = []; | ||
| try { | ||
| y.push(identity(maybeNullObject.value.inner)); | ||
| } catch { | ||
| y.push('null'); | ||
| } | ||
|
|
||
| return y; | ||
| } | ||
|
|
||
| export const FIXTURE_ENTRYPOINT = { | ||
| fn: useFoo, | ||
| params: [null], | ||
| sequentialRenders: [null, {value: 2}, {value: 3}, null], | ||
| }; |
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