IntrinsicLowering.cpp revision f907bac06887abf84fd7b46cd54f8d53ff0272c5
1//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the default intrinsic lowering implementation. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/IntrinsicLowering.h" 15#include "llvm/Constant.h" 16#include "llvm/Module.h" 17#include "llvm/Type.h" 18#include "llvm/iOther.h" 19using namespace llvm; 20 21void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) { 22 Function *Callee = CI->getCalledFunction(); 23 assert(Callee && "Cannot lower an indirect call!"); 24 25 Module *M = Callee->getParent(); 26 27 switch (Callee->getIntrinsicID()) { 28 case Intrinsic::not_intrinsic: 29 std::cerr << "Cannot lower a call to a non-intrinsic function '" 30 << Callee->getName() << "'!\n"; 31 abort(); 32 default: 33 std::cerr << "Error: Code generator does not support intrinsic function '" 34 << Callee->getName() << "'!\n"; 35 abort(); 36 37 // The default implementation of setjmp/longjmp transforms setjmp into a 38 // noop that always returns zero and longjmp into a call to abort. This 39 // allows code that never longjmps to work correctly. 40 case Intrinsic::setjmp: 41 case Intrinsic::sigsetjmp: 42 if (CI->getType() != Type::VoidTy) 43 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType())); 44 break; 45 46 case Intrinsic::longjmp: 47 case Intrinsic::siglongjmp: 48 // Insert the call to abort 49 new CallInst(M->getOrInsertFunction("abort", Type::VoidTy, 0), "", CI); 50 break; 51 52 case Intrinsic::dbg_stoppoint: 53 case Intrinsic::dbg_region_start: 54 case Intrinsic::dbg_region_end: 55 case Intrinsic::dbg_declare: 56 case Intrinsic::dbg_func_start: 57 if (CI->getType() != Type::VoidTy) 58 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType())); 59 break; // Simply strip out debugging intrinsics 60 } 61 62 assert(CI->use_empty() && 63 "Lowering should have eliminated any uses of the intrinsic call!"); 64 CI->getParent()->getInstList().erase(CI); 65} 66