https://github.com/benshi001 created
https://github.com/llvm/llvm-project/pull/74291
None
>From 2b8903b380c38c2d7f50491da75cec25ff4b801c Mon Sep 17 00:00:00 2001
From: Ben Shi <benn...@tencent.com>
Date: Mon, 4 Dec 2023 16:41:46 +0800
Subject: [PATCH] [clang][analyzer][NFC] Supplement comments in `evalFtell` of
the StreamChecker
---
clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp | 3 +++
1 file changed, 3 insertions(+)
diff --git a/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
b/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
index a4799b5f762ca..925fc90e35543 100644
--- a/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
@@ -1072,6 +1072,9 @@ void StreamChecker::evalFtell(const FnDescription *Desc,
const CallEvent &Call,
ProgramStateRef StateFailed = State->BindExpr(
CE, C.getLocationContext(), SVB.makeIntVal(-1,
C.getASTContext().LongTy));
+ // This function does not affect the stream state.
+ // Still we add success and failure state with the appropriate return value.
+ // StdLibraryFunctionsChecker can change these states (set the 'errno'
state).
C.addTransition(StateNotFailed);
C.addTransition(StateFailed);
}
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