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72 lines
2.6 KiB
C++
72 lines
2.6 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 with the isa/dyncast family of functions. In particular, this
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// allows you to do things like:
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//
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// if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(Inst))
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// ... SPI->getFileName() ... SPI->getDirectory() ...
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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/IntrinsicInst.h"
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#include "llvm/Constants.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/CodeGen/MachineModuleInfo.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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/// DbgStopPointInst - This represents the llvm.dbg.stoppoint instruction.
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///
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Value *DbgStopPointInst::getFileName() const {
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// Once the operand indices are verified, update this assert
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assert(LLVMDebugVersion == (7 << 16) && "Verify operand indices");
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return getContext()->getElement(3);
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}
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Value *DbgStopPointInst::getDirectory() const {
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// Once the operand indices are verified, update this assert
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assert(LLVMDebugVersion == (7 << 16) && "Verify operand indices");
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return getContext()->getElement(4);
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}
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