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//===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by James M. Laskey and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements methods that make it really easy to deal with intrinsic
// functions with the isa/dyncast family of functions. In particular, this
// allows you to do things like:
//
// if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(Inst))
// ... SPI->getFileName() ... SPI->getDirectory() ...
//
// All intrinsic function calls are instances of the call instruction, so these
// are all subclasses of the CallInst class. Note that none of these classes
// has state or virtual methods, which is an important part of this gross/neat
// hack working.
//
// In some cases, arguments to intrinsics need to be generic and are defined as
// type pointer to empty struct { }*. To access the real item of interest the
// cast instruction needs to be stripped away.
//
//===----------------------------------------------------------------------===//
#include "llvm/IntrinsicInst.h"
#include "llvm/Constants.h"
#include "llvm/GlobalVariable.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
/// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
///
static Value *CastOperand(Value *C) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
if (CE->isCast())
return CE->getOperand(0);
return NULL;
}
Value *DbgInfoIntrinsic::StripCast(Value *C) {
if (Value *CO = CastOperand(C)) {
C = StripCast(CO);
} else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (GV->hasInitializer())
if (Value *CO = CastOperand(GV->getInitializer()))
C = StripCast(CO);
}
return dyn_cast<GlobalVariable>(C);
}
//===----------------------------------------------------------------------===//
/// DbgStopPointInst - This represents the llvm.dbg.stoppoint instruction.
///
std::string DbgStopPointInst::getFileName() const {
// Once the operand indices are verified, update this assert
assert(LLVMDebugVersion == (6 << 16) && "Verify operand indices");
GlobalVariable *GV = cast<GlobalVariable>(getContext());
if (!GV->hasInitializer()) return "";
ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());
return CS->getOperand(3)->getStringValue();
}
std::string DbgStopPointInst::getDirectory() const {
// Once the operand indices are verified, update this assert
assert(LLVMDebugVersion == (6 << 16) && "Verify operand indices");
GlobalVariable *GV = cast<GlobalVariable>(getContext());
if (!GV->hasInitializer()) return "";
ConstantStruct *CS = cast<ConstantStruct>(GV->getInitializer());
return CS->getOperand(4)->getStringValue();
}
//===----------------------------------------------------------------------===//
/// Ensure that users of IntrinsicInst.h will link with this module.
DEFINING_FILE_FOR(IntrinsicInst)
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