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`CheckerContext::getNoteTag` has a shorthand version that takes a plain
'`StringRef Note`' instead of a lambda that calculates the note.
The old implementation of this method was incorrect because it created a lambda
that captured the StringRef, which was dereferenced much later, when the
NoteTags were visited.
In the current codebase this does not cause errors because this method is
called only once, and there the `Note` argument is a string literal that
remains valid. However, I tried to use this method in a checker that I was
prototyping, and there it printed random memory junk (instead of the message
that I composed in a local variable).
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D153889
Files:
clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
Index: clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
===================================================================
--- clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
+++ clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
@@ -316,8 +316,8 @@
/// bug path significantly shorter.
const NoteTag *getNoteTag(StringRef Note, bool IsPrunable = false) {
return getNoteTag(
- [Note](BugReporterContext &,
- PathSensitiveBugReport &) { return std::string(Note); },
+ [Note = std::string(Note)](BugReporterContext &,
+ PathSensitiveBugReport &) { return Note; },
IsPrunable);
}
Index: clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
===================================================================
--- clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
+++ clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
@@ -316,8 +316,8 @@
/// bug path significantly shorter.
const NoteTag *getNoteTag(StringRef Note, bool IsPrunable = false) {
return getNoteTag(
- [Note](BugReporterContext &,
- PathSensitiveBugReport &) { return std::string(Note); },
+ [Note = std::string(Note)](BugReporterContext &,
+ PathSensitiveBugReport &) { return Note; },
IsPrunable);
}
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