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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.
//
//===----------------------------------------------------------------------===//
//
// Representation of the sequence of machine instructions created for a single
// VM instruction. Additionally records information about hidden and implicit
// values used by the machine instructions: about hidden values used by the
// machine instructions:
//
// "Temporary values" are intermediate values used in the machine instruction
// sequence, but not in the VM instruction. Note that such values should be
// treated as pure SSA values with no interpretation of their operands (i.e., as
// a TmpInstruction object which actually represents such a value).
//
// (2) "Implicit uses" are values used in the VM instruction but not in the
// machine instruction sequence
//
//===----------------------------------------------------------------------===//
#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"
using namespace llvm;
MachineCodeForInstruction &MachineCodeForInstruction::get(const Instruction *I){
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
return MF.getInfo()->MCFIEntries[I];
}
void MachineCodeForInstruction::destroy(const Instruction *I) {
MachineFunction &MF = MachineFunction::get(I->getParent()->getParent());
MF.getInfo()->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);
}
// Mechanism to get the descriptor for a CALL MachineInstr.
// We get the LLVM CallInstr from the ret. addr. register argument
// of the CALL MachineInstr (which is explicit operand #3 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 TmpInstruction* retAddrReg =
cast<TmpInstruction>(isa<Function>(MI->getOperand(0).getVRegValue())
? MI->getImplicitRef(MI->getNumImplicitRefs()-1)
: MI->getOperand(2).getVRegValue());
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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