forked from OSchip/llvm-project
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
//===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers ---------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file 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.
|
|
//
|
|
// 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/IR/IntrinsicInst.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/GlobalVariable.h"
|
|
#include "llvm/IR/Metadata.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 nullptr;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static Value *getValueImpl(Value *Op) {
|
|
auto *MD = cast<MetadataAsValue>(Op)->getMetadata();
|
|
if (auto *V = dyn_cast<ValueAsMetadata>(MD))
|
|
return V->getValue();
|
|
|
|
// When the value goes to null, it gets replaced by an empty MDNode.
|
|
assert(!cast<MDNode>(MD)->getNumOperands() && "Expected an empty MDNode");
|
|
return nullptr;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// DbgDeclareInst - This represents the llvm.dbg.declare instruction.
|
|
///
|
|
|
|
Value *DbgDeclareInst::getAddress() const {
|
|
if (!getArgOperand(0))
|
|
return nullptr;
|
|
|
|
return getValueImpl(getArgOperand(0));
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// DbgValueInst - This represents the llvm.dbg.value instruction.
|
|
///
|
|
|
|
const Value *DbgValueInst::getValue() const {
|
|
return const_cast<DbgValueInst *>(this)->getValue();
|
|
}
|
|
|
|
Value *DbgValueInst::getValue() { return getValueImpl(getArgOperand(0)); }
|