Martin Kustermann
f99f5b1a2b
If a function doesn't have an effect we can now mark it via
`@pragma('wasm:pure-function')`. We'll then emit this as metadata
in the `binaryen.remove.if.unused` custom section.
This allows `wasm-opt` to remove calls to such functions if the result
of the call isn't used.
For now we mark a few string functions as pure.
Closes https://github.com/dart-lang/sdk/issues/62665
Change-Id: I8d38fb5894fd98248dc4d648d99c8cdcddc271a5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/481802
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>
28 lines
626 B
Dart
28 lines
626 B
Dart
// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// functionFilter=runApp|foo
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// tableFilter=NoMatch
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// globalFilter=NoMatch
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// typeFilter=NoMatch
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// compilerOption=-O2
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void main() => runApp();
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@pragma('wasm:never-inline')
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void runApp() {
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foo('1');
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foo('2');
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print(foo('3'));
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print(foo('4'));
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}
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@pragma('wasm:never-inline')
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@pragma('wasm:pure-function')
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dynamic foo(String arg) {
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'foo($arg)'.length;
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'bar($arg)'.length;
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return arg.length;
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}
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