diff options
Diffstat (limited to 'clang/lib/CodeGen/CGExpr.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGExpr.cpp | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp index 54432353e742..2480972f1432 100644 --- a/clang/lib/CodeGen/CGExpr.cpp +++ b/clang/lib/CodeGen/CGExpr.cpp @@ -56,7 +56,13 @@ using namespace CodeGen; // Experiment to make sanitizers easier to debug static llvm::cl::opt<bool> ClSanitizeDebugDeoptimization( "ubsan-unique-traps", llvm::cl::Optional, - llvm::cl::desc("Deoptimize traps for UBSAN so there is 1 trap per check")); + llvm::cl::desc("Deoptimize traps for UBSAN so there is 1 trap per check.")); + +// TODO: Introduce frontend options to enabled per sanitizers, similar to +// `fsanitize-trap`. +static llvm::cl::opt<bool> ClSanitizeGuardChecks( + "ubsan-guard-checks", llvm::cl::Optional, + llvm::cl::desc("Guard UBSAN checks with `llvm.allow.ubsan.check()`.")); //===--------------------------------------------------------------------===// // Miscellaneous Helper Methods @@ -3522,6 +3528,17 @@ void CodeGenFunction::EmitCheck( Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check; } + if (ClSanitizeGuardChecks) { + llvm::Value *Allow = + Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::allow_ubsan_check), + llvm::ConstantInt::get(CGM.Int8Ty, CheckHandler)); + + for (llvm::Value **Cond : {&FatalCond, &RecoverableCond, &TrapCond}) { + if (*Cond) + *Cond = Builder.CreateOr(*Cond, Builder.CreateNot(Allow)); + } + } + if (TrapCond) EmitTrapCheck(TrapCond, CheckHandler); if (!FatalCond && !RecoverableCond) |