[clang-tools-extra] 5b95d17 - [clang-tidy] `performance-faster-string-find` generates incorrect fixes for single quote character literals
Fabian Wolff via cfe-commits
cfe-commits at lists.llvm.org
Tue Aug 8 16:00:07 PDT 2023
Author: Fabian Wolff
Date: 2023-08-09T00:55:45+02:00
New Revision: 5b95d17da1f0719f0af711e032d36b18fcb92070
URL: https://github.com/llvm/llvm-project/commit/5b95d17da1f0719f0af711e032d36b18fcb92070
DIFF: https://github.com/llvm/llvm-project/commit/5b95d17da1f0719f0af711e032d36b18fcb92070.diff
LOG: [clang-tidy] `performance-faster-string-find` generates incorrect fixes for single quote character literals
Reviewed By: PiotrZSL
Differential Revision: https://reviews.llvm.org/D157436
Added:
Modified:
clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp
clang-tools-extra/docs/ReleaseNotes.rst
clang-tools-extra/test/clang-tidy/checkers/performance/faster-string-find.cpp
Removed:
################################################################################
diff --git a/clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp b/clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp
index d932b5fb936cb2..ca4f6ad409b08c 100644
--- a/clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp
+++ b/clang-tools-extra/clang-tidy/performance/FasterStringFindCheck.cpp
@@ -26,14 +26,20 @@ std::optional<std::string> makeCharacterLiteral(const StringLiteral *Literal) {
Literal->outputString(OS);
}
// Now replace the " with '.
- auto Pos = Result.find_first_of('"');
- if (Pos == Result.npos)
+ auto OpenPos = Result.find_first_of('"');
+ if (OpenPos == Result.npos)
return std::nullopt;
- Result[Pos] = '\'';
- Pos = Result.find_last_of('"');
- if (Pos == Result.npos)
+ Result[OpenPos] = '\'';
+
+ auto ClosePos = Result.find_last_of('"');
+ if (ClosePos == Result.npos)
return std::nullopt;
- Result[Pos] = '\'';
+ Result[ClosePos] = '\'';
+
+ // "'" is OK, but ''' is not, so add a backslash
+ if ((ClosePos - OpenPos) == 2 && Result[OpenPos + 1] == '\'')
+ Result.replace(OpenPos + 1, 1, "\\'");
+
return Result;
}
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 78d3dab48f5306..c4b09bae18ec37 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -188,6 +188,10 @@ Changes in existing checks
<clang-tidy/checks/modernize/loop-convert>` to support for-loops with
iterators initialized by free functions like ``begin``, ``end``, or ``size``.
+- Improved :doc:`performance-faster-string-find
+ <clang-tidy/checks/performance/faster-string-find>` check to properly escape
+ single quotes.
+
- Improved :doc:`performanc-noexcept-swap
<clang-tidy/checks/performance/noexcept-swap>` check to enforce a stricter
match with the swap function signature, eliminating false-positives.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/performance/faster-string-find.cpp b/clang-tools-extra/test/clang-tidy/checkers/performance/faster-string-find.cpp
index dc625024fd1bc9..b50d175cff3b70 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/performance/faster-string-find.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/performance/faster-string-find.cpp
@@ -56,13 +56,21 @@ void StringFind() {
// CHECK-MESSAGES: [[@LINE-1]]:12: warning: 'find' called with a string literal
// CHECK-FIXES: Str.find('a', 1);
- // Doens't work with strings smaller or larger than 1 char.
+ // Doesn't work with strings smaller or larger than 1 char.
Str.find("");
Str.find("ab");
// Doesn't do anything with the 3 argument overload.
Str.find("a", 1, 1);
+ // Single quotes are escaped properly
+ Str.find("'");
+ // CHECK-MESSAGES: [[@LINE-1]]:12: warning: 'find' called with a string literal
+ // CHECK-FIXES: Str.find('\'');
+ Str.find("\'");
+ // CHECK-MESSAGES: [[@LINE-1]]:12: warning: 'find' called with a string literal
+ // CHECK-FIXES: Str.find('\'');
+
// Other methods that can also be replaced
Str.rfind("a");
// CHECK-MESSAGES: [[@LINE-1]]:13: warning: 'rfind' called with a string literal
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