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//===-- MachineCodeForInstruction.cpp -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Container for the sequence of MachineInstrs created for a single
// LLVM Instruction. MachineCodeForInstruction also tracks temporary values
// (TmpInstruction objects) created during SparcV9 code generation, so that
// they can be deleted when they are no longer needed, and finally, it also
// holds some extra information for 'call' Instructions (using the
// CallArgsDescriptor object, which is also implemented in this file).
//
//===----------------------------------------------------------------------===//
#include "MachineCodeForInstruction.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "MachineFunctionInfo.h"
#include "MachineInstrAnnot.h"
#include "SparcV9TmpInstr.h"
#include "SparcV9RegisterInfo.h"
using namespace llvm;
MachineCodeForInstruction &MachineCodeForInstruction::get(const Instruction *I){
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
return MF.getInfo<SparcV9FunctionInfo>()->MCFIEntries[I];
}
void MachineCodeForInstruction::destroy(const Instruction *I) {
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
MF.getInfo<SparcV9FunctionInfo>()->MCFIEntries.erase(I);
}
void MachineCodeForInstruction::dropAllReferences() {
for (unsigned i=0, N=tempVec.size(); i < N; i++)
cast<Instruction>(tempVec[i])->dropAllReferences();
}
MachineCodeForInstruction::~MachineCodeForInstruction() {
// Let go of all uses in temp. instructions
dropAllReferences();
// Free the Value objects created to hold intermediate values
for (unsigned i=0, N=tempVec.size(); i < N; i++)
delete tempVec[i];
// do not free the MachineInstr objects allocated. they are managed
// by the ilist in MachineBasicBlock
// Free the CallArgsDescriptor if it exists.
delete callArgsDesc;
}
CallArgsDescriptor::CallArgsDescriptor(CallInst* _callInstr,
TmpInstruction* _retAddrReg,
bool _isVarArgs, bool _noPrototype)
: callInstr(_callInstr),
funcPtr(isa<Function>(_callInstr->getCalledValue())
? NULL : _callInstr->getCalledValue()),
retAddrReg(_retAddrReg),
isVarArgs(_isVarArgs),
noPrototype(_noPrototype) {
unsigned int numArgs = callInstr->getNumOperands();
argInfoVec.reserve(numArgs);
assert(callInstr->getOperand(0) == callInstr->getCalledValue()
&& "Operand 0 is ignored in the loop below!");
for (unsigned int i=1; i < numArgs; ++i)
argInfoVec.push_back(CallArgInfo(callInstr->getOperand(i)));
// Enter this object in the MachineCodeForInstr object of the CallInst.
// This transfers ownership of this object.
MachineCodeForInstruction::get(callInstr).setCallArgsDescriptor(this);
}
CallInst *CallArgsDescriptor::getReturnValue() const {
return (callInstr->getType() == Type::VoidTy? NULL : callInstr);
}
/// CallArgsDescriptor::get - Mechanism to get the descriptor for a CALL
/// MachineInstr. We get the LLVM CallInst from the return-address register
/// argument of the CALL MachineInstr (which is explicit operand #2 for
/// indirect calls or the last implicit operand for direct calls). We then get
/// the CallArgsDescriptor from the MachineCodeForInstruction object for the
/// CallInstr. This is roundabout but avoids adding a new map or annotation
/// just to keep track of CallArgsDescriptors.
///
CallArgsDescriptor *CallArgsDescriptor::get(const MachineInstr *MI) {
const Value *retAddrVal = 0;
if ((MI->getOperand (0).getType () == MachineOperand::MO_MachineRegister
&& MI->getOperand (0).getReg () == SparcV9::g0)
|| (MI->getOperand (0).getType () == MachineOperand::MO_VirtualRegister
&& !isa<Function> (MI->getOperand (0).getVRegValue ()))) {
retAddrVal = MI->getOperand (2).getVRegValue ();
} else {
retAddrVal = MI->getImplicitRef (MI->getNumImplicitRefs () - 1);
}
const TmpInstruction* retAddrReg = cast<TmpInstruction> (retAddrVal);
assert(retAddrReg->getNumOperands() == 1 &&
isa<CallInst>(retAddrReg->getOperand(0)) &&
"Location of callInstr arg for CALL instr. changed? FIX THIS CODE!");
const CallInst* callInstr = cast<CallInst>(retAddrReg->getOperand(0));
CallArgsDescriptor* desc =
MachineCodeForInstruction::get(callInstr).getCallArgsDescriptor();
assert(desc->getCallInst()==callInstr && "Incorrect call args descriptor?");
return desc;
}
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