diff options
Diffstat (limited to 'clang/lib')
| -rw-r--r-- | clang/lib/CodeGen/CGBuiltin.cpp | 39 | ||||
| -rw-r--r-- | clang/lib/Headers/intrin.h | 1 |
2 files changed, 38 insertions, 2 deletions
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp index 9ecf118ed9e..5bdb5ee8d15 100644 --- a/clang/lib/CodeGen/CGBuiltin.cpp +++ b/clang/lib/CodeGen/CGBuiltin.cpp @@ -482,10 +482,11 @@ enum class CodeGenFunction::MSVCIntrin { _InterlockedIncrement, _InterlockedOr, _InterlockedXor, + __fastfail, }; Value *CodeGenFunction::EmitMSVCBuiltinExpr(MSVCIntrin BuiltinID, - const CallExpr *E) { + const CallExpr *E) { switch (BuiltinID) { case MSVCIntrin::_BitScanForward: case MSVCIntrin::_BitScanReverse: { @@ -566,6 +567,37 @@ Value *CodeGenFunction::EmitMSVCBuiltinExpr(MSVCIntrin BuiltinID, llvm::AtomicOrdering::SequentiallyConsistent); return Builder.CreateAdd(RMWI, ConstantInt::get(IntTy, 1)); } + + case MSVCIntrin::__fastfail: { + // Request immediate process termination from the kernel. The instruction + // sequences to do this are documented on MSDN: + // https://msdn.microsoft.com/en-us/library/dn774154.aspx + llvm::Triple::ArchType ISA = getTarget().getTriple().getArch(); + StringRef Asm, Constraints; + switch (ISA) { + default: + ErrorUnsupported(E, "__fastfail call for this architecture"); + break; + case llvm::Triple::x86: + case llvm::Triple::x86_64: + Asm = "int $$0x29"; + Constraints = "{cx}"; + break; + case llvm::Triple::thumb: + Asm = "udf #251"; + Constraints = "{r0}"; + break; + } + llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, {Int32Ty}, false); + llvm::InlineAsm *IA = + llvm::InlineAsm::get(FTy, Asm, Constraints, /*SideEffects=*/true); + llvm::AttributeSet NoReturnAttr = + AttributeSet::get(getLLVMContext(), llvm::AttributeSet::FunctionIndex, + llvm::Attribute::NoReturn); + CallSite CS = Builder.CreateCall(IA, EmitScalarExpr(E->getArg(0))); + CS.setAttributes(NoReturnAttr); + return CS.getInstruction(); + } } llvm_unreachable("Incorrect MSVC intrinsic!"); } @@ -2276,6 +2308,11 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, break; } + case Builtin::BI__fastfail: { + return RValue::get(EmitMSVCBuiltinExpr(MSVCIntrin::__fastfail, E)); + break; + } + case Builtin::BI__builtin_coro_size: { auto & Context = getContext(); auto SizeTy = Context.getSizeType(); diff --git a/clang/lib/Headers/intrin.h b/clang/lib/Headers/intrin.h index a35262af846..1b98dd8267e 100644 --- a/clang/lib/Headers/intrin.h +++ b/clang/lib/Headers/intrin.h @@ -69,7 +69,6 @@ static __inline__ __int64 __emul(int, int); static __inline__ unsigned __int64 __emulu(unsigned int, unsigned int); -void __cdecl __fastfail(unsigned int); unsigned int __getcallerseflags(void); static __inline__ void __halt(void); |
