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