================
@@ -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());
+}
+
+QualType getOverflowBuiltinResultType(const CallEvent &Call) {
+ // Calling a builtin with an incorrect argument count produces compiler
error.
+ assert(Call.getNumArgs() == 3);
+
+ return Call.getArgExpr(2)->getType()->getPointeeType();
+}
+
+QualType getOverflowBuiltinResultType(const CallEvent &Call, CheckerContext &C,
+ unsigned BI) {
+ // Calling a builtin with an incorrect argument count produces compiler
error.
+ assert(Call.getNumArgs() == 3);
+
+ ASTContext &ACtx = C.getASTContext();
+
+ switch (BI) {
+ case Builtin::BI__builtin_smul_overflow:
+ case Builtin::BI__builtin_ssub_overflow:
+ case Builtin::BI__builtin_sadd_overflow:
+ return ACtx.IntTy;
+ case Builtin::BI__builtin_smull_overflow:
+ case Builtin::BI__builtin_ssubl_overflow:
+ case Builtin::BI__builtin_saddl_overflow:
+ return ACtx.LongTy;
+ case Builtin::BI__builtin_smulll_overflow:
+ case Builtin::BI__builtin_ssubll_overflow:
+ case Builtin::BI__builtin_saddll_overflow:
+ return ACtx.LongLongTy;
+ case Builtin::BI__builtin_umul_overflow:
+ case Builtin::BI__builtin_usub_overflow:
+ case Builtin::BI__builtin_uadd_overflow:
+ return ACtx.UnsignedIntTy;
+ case Builtin::BI__builtin_umull_overflow:
+ case Builtin::BI__builtin_usubl_overflow:
+ case Builtin::BI__builtin_uaddl_overflow:
+ return ACtx.UnsignedLongTy;
+ case Builtin::BI__builtin_umulll_overflow:
+ case Builtin::BI__builtin_usubll_overflow:
+ case Builtin::BI__builtin_uaddll_overflow:
+ return ACtx.UnsignedLongLongTy;
+ case Builtin::BI__builtin_mul_overflow:
+ case Builtin::BI__builtin_sub_overflow:
+ case Builtin::BI__builtin_add_overflow:
+ return getOverflowBuiltinResultType(Call);
+ default:
+ assert(false && "Unknown overflow builtin");
+ return ACtx.IntTy;
+ }
+}
+
class BuiltinFunctionChecker : public Checker<eval::Call> {
public:
bool evalCall(const CallEvent &Call, CheckerContext &C) const;
+ void handleOverflowBuiltin(const CallEvent &Call, CheckerContext &C,
+ BinaryOperator::Opcode Op,
+ QualType ResultType) const;
+ const NoteTag *createBuiltinNoOverflowNoteTag(CheckerContext &C,
+ bool bothFeasible, SVal Arg1,
----------------
steakhal wrote:
```suggestion
bool BothFeasible, SVal Arg1,
```
https://github.com/llvm/llvm-project/pull/102602
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