MachineBasicBlock.cpp revision 9bcdcd17c7219dbc68de2f11ca2de86471c8c390 
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"
21using namespace llvm;
22
23MachineBasicBlock::~MachineBasicBlock() {
24  LeakDetector::removeGarbageObject(this);
25}
26
27
28
29// MBBs start out as #-1. When a MBB is added to a MachineFunction, it
30// gets the next available unique MBB number. If it is removed from a
31// MachineFunction, it goes back to being #-1.
32void ilist_traits<MachineBasicBlock>::addNodeToList (MachineBasicBlock* N)
33{
34  assert(N->Parent == 0 && "machine instruction already in a basic block");
35  N->Parent = Parent;
36  N->Number = Parent->getNextMBBNumber();
37  LeakDetector::removeGarbageObject(N);
38
39
40}
41
42void ilist_traits<MachineBasicBlock>::removeNodeFromList (MachineBasicBlock* N)
43{
44  assert(N->Parent != 0 && "machine instruction not in a basic block");
45  N->Parent = 0;
46  N->Number = -1;
47  LeakDetector::addGarbageObject(N);
48}
49
50
51MachineInstr* ilist_traits<MachineInstr>::createNode()
52{
53    MachineInstr* dummy = new MachineInstr(0, 0);
54    LeakDetector::removeGarbageObject(dummy);
55    return dummy;
56}
57
58void ilist_traits<MachineInstr>::addNodeToList(MachineInstr* N)
59{
60    assert(N->parent == 0 && "machine instruction already in a basic block");
61    N->parent = parent;
62    LeakDetector::removeGarbageObject(N);
63}
64
65void ilist_traits<MachineInstr>::removeNodeFromList(MachineInstr* N)
66{
67    assert(N->parent != 0 && "machine instruction not in a basic block");
68    N->parent = 0;
69    LeakDetector::addGarbageObject(N);
70}
71
72void ilist_traits<MachineInstr>::transferNodesFromList(
73    iplist<MachineInstr, ilist_traits<MachineInstr> >& toList,
74    ilist_iterator<MachineInstr> first,
75    ilist_iterator<MachineInstr> last)
76{
77    if (parent != toList.parent)
78        for (; first != last; ++first)
79            first->parent = toList.parent;
80}
81
82MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator()
83{
84  const TargetInstrInfo& TII = *getParent()->getTarget().getInstrInfo();
85  iterator I = end();
86  while (I != begin() && TII.isTerminatorInstr((--I)->getOpcode()));
87  if (I != end() && !TII.isTerminatorInstr(I->getOpcode())) ++I;
88  return I;
89}
90
91void MachineBasicBlock::dump() const
92{
93    print(std::cerr);
94}
95
96void MachineBasicBlock::print(std::ostream &OS) const
97{
98  if(!getParent()) {
99    OS << "Can't print out MachineBasicBlock because parent MachineFunction is null\n";
100    return;
101  }
102    const BasicBlock *LBB = getBasicBlock();
103    if(LBB)
104      OS << "\n" << LBB->getName() << " (" << (const void*)LBB << "):\n";
105    for (const_iterator I = begin(); I != end(); ++I) {
106        OS << "\t";
107        I->print(OS, getParent()->getTarget());
108    }
109}
110