MachineBasicBlock.cpp revision 954da37bb492b519f5c31dc360f2a142567e08b4 
1//===-- llvm/CodeGen/MachineBasicBlock.cpp ----------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Collect the sequence of machine instructions for a basic block.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/MachineBasicBlock.h"
15#include "llvm/BasicBlock.h"
16#include "llvm/CodeGen/MachineFunction.h"
17#include "llvm/CodeGen/MachineInstr.h"
18#include "llvm/Target/TargetInstrInfo.h"
19#include "llvm/Target/TargetMachine.h"
20#include "Support/LeakDetector.h"
21#include <iostream>
22using namespace llvm;
23
24MachineBasicBlock::~MachineBasicBlock() {
25  LeakDetector::removeGarbageObject(this);
26}
27
28
29
30// MBBs start out as #-1. When a MBB is added to a MachineFunction, it
31// gets the next available unique MBB number. If it is removed from a
32// MachineFunction, it goes back to being #-1.
33void ilist_traits<MachineBasicBlock>::addNodeToList(MachineBasicBlock* N) {
34  assert(N->Parent == 0 && "machine instruction already in a basic block");
35  N->Parent = Parent;
36  N->Number = Parent->addToMBBNumbering(N);
37  LeakDetector::removeGarbageObject(N);
38}
39
40void ilist_traits<MachineBasicBlock>::removeNodeFromList(MachineBasicBlock* N) {
41  assert(N->Parent != 0 && "machine instruction not in a basic block");
42  N->Parent->removeFromMBBNumbering(N->Number);
43  N->Number = -1;
44  N->Parent = 0;
45  LeakDetector::addGarbageObject(N);
46}
47
48
49MachineInstr* ilist_traits<MachineInstr>::createNode() {
50    MachineInstr* dummy = new MachineInstr(0, 0);
51    LeakDetector::removeGarbageObject(dummy);
52    return dummy;
53}
54
55void ilist_traits<MachineInstr>::addNodeToList(MachineInstr* N)
56{
57    assert(N->parent == 0 && "machine instruction already in a basic block");
58    N->parent = parent;
59    LeakDetector::removeGarbageObject(N);
60}
61
62void ilist_traits<MachineInstr>::removeNodeFromList(MachineInstr* N)
63{
64    assert(N->parent != 0 && "machine instruction not in a basic block");
65    N->parent = 0;
66    LeakDetector::addGarbageObject(N);
67}
68
69void ilist_traits<MachineInstr>::transferNodesFromList(
70    iplist<MachineInstr, ilist_traits<MachineInstr> >& toList,
71    ilist_iterator<MachineInstr> first,
72    ilist_iterator<MachineInstr> last)
73{
74    if (parent != toList.parent)
75        for (; first != last; ++first)
76            first->parent = toList.parent;
77}
78
79MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator()
80{
81  const TargetInstrInfo& TII = *getParent()->getTarget().getInstrInfo();
82  iterator I = end();
83  while (I != begin() && TII.isTerminatorInstr((--I)->getOpcode()));
84  if (I != end() && !TII.isTerminatorInstr(I->getOpcode())) ++I;
85  return I;
86}
87
88void MachineBasicBlock::dump() const
89{
90    print(std::cerr);
91}
92
93void MachineBasicBlock::print(std::ostream &OS) const
94{
95  if(!getParent()) {
96    OS << "Can't print out MachineBasicBlock because parent MachineFunction is null\n";
97    return;
98  }
99    const BasicBlock *LBB = getBasicBlock();
100    if(LBB)
101      OS << "\n" << LBB->getName() << " (" << (const void*)this
102         << ", LLVM BB @" << (const void*) LBB << "):\n";
103    for (const_iterator I = begin(); I != end(); ++I) {
104        OS << "\t";
105        I->print(OS, &getParent()->getTarget());
106    }
107}
108