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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41676 91177308-0d34-0410-b5e6-96231b3b80d8
289 lines
9.7 KiB
C++
289 lines
9.7 KiB
C++
//===-- llvm/CodeGen/MachineBasicBlock.cpp ----------------------*- C++ -*-===//
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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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// Collect the sequence of machine instructions for a basic block.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/MRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/LeakDetector.h"
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#include <algorithm>
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using namespace llvm;
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MachineBasicBlock::~MachineBasicBlock() {
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LeakDetector::removeGarbageObject(this);
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}
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std::ostream& llvm::operator<<(std::ostream &OS, const MachineBasicBlock &MBB) {
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MBB.print(OS);
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return OS;
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}
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// MBBs start out as #-1. When a MBB is added to a MachineFunction, it
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// gets the next available unique MBB number. If it is removed from a
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// MachineFunction, it goes back to being #-1.
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void ilist_traits<MachineBasicBlock>::addNodeToList(MachineBasicBlock* N) {
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assert(N->Parent == 0 && "machine instruction already in a basic block");
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N->Parent = Parent;
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N->Number = Parent->addToMBBNumbering(N);
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LeakDetector::removeGarbageObject(N);
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}
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void ilist_traits<MachineBasicBlock>::removeNodeFromList(MachineBasicBlock* N) {
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assert(N->Parent != 0 && "machine instruction not in a basic block");
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N->Parent->removeFromMBBNumbering(N->Number);
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N->Number = -1;
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N->Parent = 0;
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LeakDetector::addGarbageObject(N);
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}
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MachineInstr* ilist_traits<MachineInstr>::createSentinel() {
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MachineInstr* dummy = new MachineInstr();
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LeakDetector::removeGarbageObject(dummy);
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return dummy;
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}
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void ilist_traits<MachineInstr>::addNodeToList(MachineInstr* N) {
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assert(N->parent == 0 && "machine instruction already in a basic block");
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N->parent = parent;
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LeakDetector::removeGarbageObject(N);
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}
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void ilist_traits<MachineInstr>::removeNodeFromList(MachineInstr* N) {
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assert(N->parent != 0 && "machine instruction not in a basic block");
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N->parent = 0;
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LeakDetector::addGarbageObject(N);
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}
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void ilist_traits<MachineInstr>::transferNodesFromList(
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iplist<MachineInstr, ilist_traits<MachineInstr> >& fromList,
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ilist_iterator<MachineInstr> first,
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ilist_iterator<MachineInstr> last) {
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if (parent != fromList.parent)
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for (; first != last; ++first)
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first->parent = parent;
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}
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MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator() {
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const TargetInstrInfo& TII = *getParent()->getTarget().getInstrInfo();
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iterator I = end();
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while (I != begin() && TII.isTerminatorInstr((--I)->getOpcode()))
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; /*noop */
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if (I != end() && !TII.isTerminatorInstr(I->getOpcode())) ++I;
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return I;
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}
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void MachineBasicBlock::dump() const {
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print(*cerr.stream());
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}
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static inline void OutputReg(std::ostream &os, unsigned RegNo,
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const MRegisterInfo *MRI = 0) {
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if (!RegNo || MRegisterInfo::isPhysicalRegister(RegNo)) {
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if (MRI)
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os << " %" << MRI->get(RegNo).Name;
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else
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os << " %mreg(" << RegNo << ")";
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} else
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os << " %reg" << RegNo;
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}
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void MachineBasicBlock::print(std::ostream &OS) const {
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const MachineFunction *MF = getParent();
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if(!MF) {
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OS << "Can't print out MachineBasicBlock because parent MachineFunction"
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<< " is null\n";
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return;
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}
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const BasicBlock *LBB = getBasicBlock();
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OS << "\n";
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if (LBB) OS << LBB->getName() << ": ";
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OS << (const void*)this
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<< ", LLVM BB @" << (const void*) LBB << ", ID#" << getNumber();
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if (isLandingPad()) OS << ", EH LANDING PAD";
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OS << ":\n";
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const MRegisterInfo *MRI = MF->getTarget().getRegisterInfo();
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if (livein_begin() != livein_end()) {
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OS << "Live Ins:";
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for (const_livein_iterator I = livein_begin(),E = livein_end(); I != E; ++I)
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OutputReg(OS, *I, MRI);
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OS << "\n";
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}
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// Print the preds of this block according to the CFG.
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if (!pred_empty()) {
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OS << " Predecessors according to CFG:";
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for (const_pred_iterator PI = pred_begin(), E = pred_end(); PI != E; ++PI)
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OS << " " << *PI << " (#" << (*PI)->getNumber() << ")";
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OS << "\n";
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}
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for (const_iterator I = begin(); I != end(); ++I) {
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OS << "\t";
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I->print(OS, &getParent()->getTarget());
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}
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// Print the successors of this block according to the CFG.
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if (!succ_empty()) {
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OS << " Successors according to CFG:";
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for (const_succ_iterator SI = succ_begin(), E = succ_end(); SI != E; ++SI)
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OS << " " << *SI << " (#" << (*SI)->getNumber() << ")";
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OS << "\n";
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}
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}
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void MachineBasicBlock::removeLiveIn(unsigned Reg) {
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livein_iterator I = std::find(livein_begin(), livein_end(), Reg);
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assert(I != livein_end() && "Not a live in!");
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LiveIns.erase(I);
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}
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void MachineBasicBlock::moveBefore(MachineBasicBlock *NewAfter) {
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MachineFunction::BasicBlockListType &BBList =getParent()->getBasicBlockList();
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getParent()->getBasicBlockList().splice(NewAfter, BBList, this);
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}
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void MachineBasicBlock::moveAfter(MachineBasicBlock *NewBefore) {
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MachineFunction::BasicBlockListType &BBList =getParent()->getBasicBlockList();
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MachineFunction::iterator BBI = NewBefore;
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getParent()->getBasicBlockList().splice(++BBI, BBList, this);
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}
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void MachineBasicBlock::addSuccessor(MachineBasicBlock *succ) {
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Successors.push_back(succ);
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succ->addPredecessor(this);
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}
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void MachineBasicBlock::removeSuccessor(MachineBasicBlock *succ) {
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succ->removePredecessor(this);
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succ_iterator I = std::find(Successors.begin(), Successors.end(), succ);
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assert(I != Successors.end() && "Not a current successor!");
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Successors.erase(I);
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}
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MachineBasicBlock::succ_iterator MachineBasicBlock::removeSuccessor(succ_iterator I) {
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assert(I != Successors.end() && "Not a current successor!");
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(*I)->removePredecessor(this);
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return(Successors.erase(I));
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}
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void MachineBasicBlock::addPredecessor(MachineBasicBlock *pred) {
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Predecessors.push_back(pred);
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}
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void MachineBasicBlock::removePredecessor(MachineBasicBlock *pred) {
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std::vector<MachineBasicBlock *>::iterator I =
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std::find(Predecessors.begin(), Predecessors.end(), pred);
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assert(I != Predecessors.end() && "Pred is not a predecessor of this block!");
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Predecessors.erase(I);
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}
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bool MachineBasicBlock::isSuccessor(MachineBasicBlock *MBB) const {
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std::vector<MachineBasicBlock *>::const_iterator I =
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std::find(Successors.begin(), Successors.end(), MBB);
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return I != Successors.end();
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}
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/// ReplaceUsesOfBlockWith - Given a machine basic block that branched to
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/// 'Old', change the code and CFG so that it branches to 'New' instead.
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void MachineBasicBlock::ReplaceUsesOfBlockWith(MachineBasicBlock *Old,
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MachineBasicBlock *New) {
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assert(Old != New && "Cannot replace self with self!");
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MachineBasicBlock::iterator I = end();
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while (I != begin()) {
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--I;
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if (!(I->getInstrDescriptor()->Flags & M_TERMINATOR_FLAG)) break;
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// Scan the operands of this machine instruction, replacing any uses of Old
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// with New.
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
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if (I->getOperand(i).isMachineBasicBlock() &&
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I->getOperand(i).getMachineBasicBlock() == Old)
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I->getOperand(i).setMachineBasicBlock(New);
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}
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// Update the successor information. If New was already a successor, just
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// remove the link to Old instead of creating another one. PR 1444.
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removeSuccessor(Old);
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if (!isSuccessor(New))
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addSuccessor(New);
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}
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/// CorrectExtraCFGEdges - Various pieces of code can cause excess edges in the
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/// CFG to be inserted. If we have proven that MBB can only branch to DestA and
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/// DestB, remove any other MBB successors from the CFG. DestA and DestB can
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/// be null.
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/// Besides DestA and DestB, retain other edges leading to LandingPads (currently
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/// there can be only one; we don't check or require that here).
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/// Note it is possible that DestA and/or DestB are LandingPads.
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bool MachineBasicBlock::CorrectExtraCFGEdges(MachineBasicBlock *DestA,
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MachineBasicBlock *DestB,
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bool isCond) {
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bool MadeChange = false;
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bool AddedFallThrough = false;
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MachineBasicBlock *FallThru = getNext();
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// If this block ends with a conditional branch that falls through to its
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// successor, set DestB as the successor.
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if (isCond) {
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if (DestB == 0 && FallThru != getParent()->end()) {
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DestB = FallThru;
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AddedFallThrough = true;
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}
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} else {
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// If this is an unconditional branch with no explicit dest, it must just be
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// a fallthrough into DestB.
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if (DestA == 0 && FallThru != getParent()->end()) {
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DestA = FallThru;
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AddedFallThrough = true;
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}
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}
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MachineBasicBlock::succ_iterator SI = succ_begin();
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MachineBasicBlock *OrigDestA = DestA, *OrigDestB = DestB;
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while (SI != succ_end()) {
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if (*SI == DestA && DestA == DestB) {
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DestA = DestB = 0;
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++SI;
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} else if (*SI == DestA) {
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DestA = 0;
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++SI;
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} else if (*SI == DestB) {
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DestB = 0;
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++SI;
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} else if ((*SI)->isLandingPad() &&
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*SI!=OrigDestA && *SI!=OrigDestB) {
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++SI;
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} else {
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// Otherwise, this is a superfluous edge, remove it.
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SI = removeSuccessor(SI);
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MadeChange = true;
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}
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}
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if (!AddedFallThrough) {
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assert(DestA == 0 && DestB == 0 &&
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"MachineCFG is missing edges!");
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} else if (isCond) {
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assert(DestA == 0 && "MachineCFG is missing edges!");
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}
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return MadeChange;
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}
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