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