forked from OSchip/llvm-project
74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
//===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements methods that make it really easy to deal with intrinsic
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// functions.
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//
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// All intrinsic function calls are instances of the call instruction, so these
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// are all subclasses of the CallInst class. Note that none of these classes
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// has state or virtual methods, which is an important part of this gross/neat
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// hack working.
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//
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// In some cases, arguments to intrinsics need to be generic and are defined as
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// type pointer to empty struct { }*. To access the real item of interest the
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// cast instruction needs to be stripped away.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Metadata.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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/// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
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///
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static Value *CastOperand(Value *C) {
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
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if (CE->isCast())
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return CE->getOperand(0);
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return NULL;
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}
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Value *DbgInfoIntrinsic::StripCast(Value *C) {
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if (Value *CO = CastOperand(C)) {
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C = StripCast(CO);
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} else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
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if (GV->hasInitializer())
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if (Value *CO = CastOperand(GV->getInitializer()))
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C = StripCast(CO);
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}
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return dyn_cast<GlobalVariable>(C);
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}
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//===----------------------------------------------------------------------===//
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/// DbgDeclareInst - This represents the llvm.dbg.declare instruction.
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///
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Value *DbgDeclareInst::getAddress() const {
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if (MDNode* MD = cast_or_null<MDNode>(getArgOperand(0)))
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return MD->getOperand(0);
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else
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return NULL;
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}
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//===----------------------------------------------------------------------===//
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/// DbgValueInst - This represents the llvm.dbg.value instruction.
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///
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const Value *DbgValueInst::getValue() const {
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return cast<MDNode>(getArgOperand(0))->getOperand(0);
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}
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Value *DbgValueInst::getValue() {
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return cast<MDNode>(getArgOperand(0))->getOperand(0);
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}
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