[analyzer] Fix wrong builtin_*_overflow return type
#111253
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@llvm/pr-subscribers-clang @llvm/pr-subscribers-clang-static-analyzer-1 Author: Pavel Skripkin (pskrgag) Changes
Fix it by directly passing Closes: #111147 [1] https://clang.llvm.org/docs/LanguageExtensions.html#checked-arithmetic-builtins Full diff: https://github.com/llvm/llvm-project/pull/111253.diff 2 Files Affected:
diff --git a/clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
index 69d8e968283b37..d49f01898e2241 100644
--- a/clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
@@ -183,6 +183,7 @@ void BuiltinFunctionChecker::handleOverflowBuiltin(const CallEvent &Call,
ProgramStateRef State = C.getState();
SValBuilder &SVB = C.getSValBuilder();
const Expr *CE = Call.getOriginExpr();
+ auto BoolTy = C.getASTContext().BoolTy;
SVal Arg1 = Call.getArgSVal(0);
SVal Arg2 = Call.getArgSVal(1);
@@ -194,7 +195,7 @@ void BuiltinFunctionChecker::handleOverflowBuiltin(const CallEvent &Call,
auto [Overflow, NotOverflow] = checkOverflow(C, RetValMax, ResultType);
if (NotOverflow) {
ProgramStateRef StateNoOverflow =
- State->BindExpr(CE, C.getLocationContext(), SVB.makeTruthVal(false));
+ State->BindExpr(CE, C.getLocationContext(), SVB.makeTruthVal(false, BoolTy));
if (auto L = Call.getArgSVal(2).getAs<Loc>()) {
StateNoOverflow =
@@ -213,7 +214,7 @@ void BuiltinFunctionChecker::handleOverflowBuiltin(const CallEvent &Call,
if (Overflow) {
C.addTransition(
- State->BindExpr(CE, C.getLocationContext(), SVB.makeTruthVal(true)),
+ State->BindExpr(CE, C.getLocationContext(), SVB.makeTruthVal(true, BoolTy)),
createBuiltinOverflowNoteTag(C));
}
}
diff --git a/clang/test/Analysis/builtin_overflow.c b/clang/test/Analysis/builtin_overflow.c
index 5c61795661d095..9d98ce7a1af45c 100644
--- a/clang/test/Analysis/builtin_overflow.c
+++ b/clang/test/Analysis/builtin_overflow.c
@@ -1,5 +1,5 @@
// RUN: %clang_analyze_cc1 -triple x86_64-unknown-unknown -verify %s \
-// RUN: -analyzer-checker=core,debug.ExprInspection
+// RUN: -analyzer-checker=core,debug.ExprInspection,alpha.core.BoolAssignment
#define __UINT_MAX__ (__INT_MAX__ * 2U + 1U)
#define __INT_MIN__ (-__INT_MAX__ - 1)
@@ -155,3 +155,12 @@ void test_uadd_overflow_contraints(unsigned a, unsigned b)
return;
}
}
+
+void test_bool_assign(void)
+{
+ int res;
+
+ // Reproduce issue from GH#111147. __builtin_*_overflow funcions
+ // should return _Bool, but not int.
+ _Bool ret = __builtin_mul_overflow(10, 20, &res); // no crash
+}
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✅ With the latest revision this PR passed the C/C++ code formatter. |
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CI looks unrelated Should I re-trigger it just in case? |
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Oct 5, 2024
`builtin_*_overflow` functions return `_Bool` according to [1]. `BuiltinFunctionChecker` was using `makeTruthVal` w/o specifying explicit type, which creates an `int` value, since it's the type of any compassion according to C standard. Fix it by directly passing `BoolTy` to `makeTruthVal` Closes: llvm#111147 [1] https://clang.llvm.org/docs/LanguageExtensions.html#checked-arithmetic-builtins
Kyvangka1610
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Oct 5, 2024
* commit 'FETCH_HEAD': [clang][bytecode] Handle UETT_OpenMPRequiredSimdAlign (llvm#111259) [mlir][polynomial] Add and verify constraints of coefficientModulus for ringAttr (llvm#111016) [clang][bytecode] Save a per-Block IsWeak bit (llvm#111248) [analyzer] Fix wrong `builtin_*_overflow` return type (llvm#111253) [SelectOpt] Don't convert constant selects to branches. (llvm#110858) [InstCombine] Update and-or-icmps.ll after 574266c. NFC [Instcombine] Test for more gep canonicalization [NFC][TableGen] Change `CodeGenIntrinsics` to use const references (llvm#111219) Add warning message to `session save` when transcript isn't saved. (llvm#109020) [RISCV][TTI] Recognize CONCAT_VECTORS if a shufflevector mask is multiple insert subvector. (llvm#110457) Revert "[InstCombine] Folding `(icmp eq/ne (and X, -P2), INT_MIN)`" (llvm#111236) [NFC][lsan] Add SuspendAllThreads traces [lsan] Add `thread_suspend_fail` flag Signed-off-by: kyvangka1610 <[email protected]>
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@pskrgag Thanks for fixing this issue quickly! 😄 |
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builtin_*_overflowfunctions return_Boolaccording to [1].BuiltinFunctionCheckerwas usingmakeTruthValw/o specifying explicit type, which creates anintvalue, since it's the type of any compassion according to C standard.Fix it by directly passing
BoolTytomakeTruthValCloses: #111147
[1] https://clang.llvm.org/docs/LanguageExtensions.html#checked-arithmetic-builtins