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cppcheck: use move semantics for 'NodeKinds' and update possible callers to use it #87273

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merged 1 commit into from
Apr 20, 2024

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@Amila-Rukshan Amila-Rukshan commented Apr 1, 2024

Fixes: #87248

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@llvmbot llvmbot added the clang Clang issues not falling into any other category label Apr 1, 2024
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llvmbot commented Apr 1, 2024

@llvm/pr-subscribers-clang

Author: Amila Senadheera (Amila-Rukshan)

Changes

Fix the cppcheck identified performance issue: #87248

I ran the following to check the possible perf issue in clang/lib/ASTMatchers/Dynamic directory:

cppcheck --enable=performance --language=c++ .

Full diff: https://github.com/llvm/llvm-project/pull/87273.diff

1 Files Affected:

  • (modified) clang/lib/ASTMatchers/Dynamic/Marshallers.h (+1-1)
diff --git a/clang/lib/ASTMatchers/Dynamic/Marshallers.h b/clang/lib/ASTMatchers/Dynamic/Marshallers.h
index c76ddf17b719d4..fc0771d7496df2 100644
--- a/clang/lib/ASTMatchers/Dynamic/Marshallers.h
+++ b/clang/lib/ASTMatchers/Dynamic/Marshallers.h
@@ -936,7 +936,7 @@ class MapAnyOfMatcherDescriptor : public MatcherDescriptor {
 
 public:
   MapAnyOfMatcherDescriptor(ASTNodeKind CladeNodeKind,
-                            std::vector<ASTNodeKind> NodeKinds)
+                            const std::vector<ASTNodeKind>& NodeKinds)
       : CladeNodeKind(CladeNodeKind), NodeKinds(NodeKinds) {}
 
   VariantMatcher create(SourceRange NameRange, ArrayRef<ParserValue> Args,

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firewave commented Apr 1, 2024

Depending on the calling code the fix might actually be the introduction of std::move().

This is a known issue upstream: https://trac.cppcheck.net/ticket/12384.

@Amila-Rukshan Amila-Rukshan changed the title cppcheck: pass NodeKinds by const reference cppcheck: use move semantics for 'NodeKinds' and update possible callers to use it Apr 2, 2024
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Amila-Rukshan commented Apr 2, 2024

@firewave, Thank you for pointing it out! I have updated the PR now

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Ping

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LGTM

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RKSimon commented Apr 19, 2024

@Amila-Rukshan please can you rebase this patch? merge is currently failing

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@RKSimon I have rebased the changes

@RKSimon RKSimon merged commit 32623a3 into llvm:main Apr 20, 2024
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aniplcc pushed a commit to aniplcc/llvm-project that referenced this pull request Apr 21, 2024
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clang/lib/ASTMatchers/Dynamic/Marshallers.h:939: possible performance problem ?
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