1 //===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements methods that make it really easy to deal with intrinsic 11 // functions. 12 // 13 // All intrinsic function calls are instances of the call instruction, so these 14 // are all subclasses of the CallInst class. Note that none of these classes 15 // has state or virtual methods, which is an important part of this gross/neat 16 // hack working. 17 // 18 // In some cases, arguments to intrinsics need to be generic and are defined as 19 // type pointer to empty struct { }*. To access the real item of interest the 20 // cast instruction needs to be stripped away. 21 // 22 //===----------------------------------------------------------------------===// 23 24 #include "llvm/IR/IntrinsicInst.h" 25 #include "llvm/IR/Constants.h" 26 #include "llvm/IR/GlobalVariable.h" 27 #include "llvm/IR/Metadata.h" 28 using namespace llvm; 29 30 //===----------------------------------------------------------------------===// 31 /// DbgInfoIntrinsic - This is the common base class for debug info intrinsics 32 /// 33 34 static Value *CastOperand(Value *C) { 35 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) 36 if (CE->isCast()) 37 return CE->getOperand(0); 38 return nullptr; 39 } 40 41 Value *DbgInfoIntrinsic::StripCast(Value *C) { 42 if (Value *CO = CastOperand(C)) { 43 C = StripCast(CO); 44 } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) { 45 if (GV->hasInitializer()) 46 if (Value *CO = CastOperand(GV->getInitializer())) 47 C = StripCast(CO); 48 } 49 return dyn_cast<GlobalVariable>(C); 50 } 51 52 //===----------------------------------------------------------------------===// 53 /// DbgDeclareInst - This represents the llvm.dbg.declare instruction. 54 /// 55 56 Value *DbgDeclareInst::getAddress() const { 57 if (MDNode* MD = cast_or_null<MDNode>(getArgOperand(0))) 58 return MD->getOperand(0); 59 else 60 return nullptr; 61 } 62 63 //===----------------------------------------------------------------------===// 64 /// DbgValueInst - This represents the llvm.dbg.value instruction. 65 /// 66 67 const Value *DbgValueInst::getValue() const { 68 return cast<MDNode>(getArgOperand(0))->getOperand(0); 69 } 70 71 Value *DbgValueInst::getValue() { 72 return cast<MDNode>(getArgOperand(0))->getOperand(0); 73 } 74
