================
@@ -16,21 +16,93 @@
#include "clang/Basic/Builtins.h"
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
+#include "clang/StaticAnalyzer/Checkers/Taint.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerHelpers.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicExtent.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
using namespace clang;
using namespace ento;
+using namespace taint;
namespace {
+QualType getSufficientTypeForOverflowOp(CheckerContext &C, const QualType &T) {
+ // Calling a builtin with a non-integer type result produces compiler error.
+ assert(T->isIntegerType());
+
+ ASTContext &ACtx = C.getASTContext();
+
+ unsigned BitWidth = ACtx.getIntWidth(T);
+ return ACtx.getIntTypeForBitwidth(BitWidth * 2, T->isSignedIntegerType());
----------------
NagyDonat wrote:
What happens if `BitWidth * 2` is too large and there is no standard /
semi-standard (like `__int128`) type to represent it? Do we get a compiler
error at an earlier step? Does this call crash?
https://github.com/llvm/llvm-project/pull/102602
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