Fix the sense of joinable

[oota-llvm.git] / lib / CodeGen / MachineBasicBlock.cpp

diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 9d65453edff2ef877d83aacfca51c4b8eeb83e84..20390a2f50e34d83ed7e98a9e654f4e50350d68c 100644 (file)
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -15,18 +15,38 @@
 #include "llvm/BasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
 #include "Support/LeakDetector.h"
+#include <iostream>
 using namespace llvm;
 
-const MachineFunction *MachineBasicBlock::getParent() const {
-  // Get the parent by getting the Function parent of the basic block, and
-  // getting the MachineFunction from it.
-  return &MachineFunction::get(getBasicBlock()->getParent());
+MachineBasicBlock::~MachineBasicBlock() {
+  LeakDetector::removeGarbageObject(this);
 }
+  
 
 
-MachineInstr* ilist_traits<MachineInstr>::createNode()
-{
+// MBBs start out as #-1. When a MBB is added to a MachineFunction, it 
+// gets the next available unique MBB number. If it is removed from a
+// MachineFunction, it goes back to being #-1.
+void ilist_traits<MachineBasicBlock>::addNodeToList(MachineBasicBlock* N) {
+  assert(N->Parent == 0 && "machine instruction already in a basic block");
+  N->Parent = Parent;
+  N->Number = Parent->addToMBBNumbering(N);
+  LeakDetector::removeGarbageObject(N);
+}
+
+void ilist_traits<MachineBasicBlock>::removeNodeFromList(MachineBasicBlock* N) {
+  assert(N->Parent != 0 && "machine instruction not in a basic block");
+  N->Parent->removeFromMBBNumbering(N->Number);
+  N->Number = -1;
+  N->Parent = 0;
+  LeakDetector::addGarbageObject(N);
+}
+
+
+MachineInstr* ilist_traits<MachineInstr>::createNode() {
     MachineInstr* dummy = new MachineInstr(0, 0);
     LeakDetector::removeGarbageObject(dummy);
     return dummy;
@@ -56,6 +76,15 @@ void ilist_traits<MachineInstr>::transferNodesFromList(
             first->parent = toList.parent;
 }
 
+MachineBasicBlock::iterator MachineBasicBlock::getFirstTerminator()
+{
+  const TargetInstrInfo& TII = *getParent()->getTarget().getInstrInfo();
+  iterator I = end();
+  while (I != begin() && TII.isTerminatorInstr((--I)->getOpcode()));
+  if (I != end() && !TII.isTerminatorInstr(I->getOpcode())) ++I;
+  return I;
+}
+
 void MachineBasicBlock::dump() const
 {
     print(std::cerr);
@@ -63,10 +92,16 @@ void MachineBasicBlock::dump() const
 
 void MachineBasicBlock::print(std::ostream &OS) const
 {
+  if(!getParent()) {
+    OS << "Can't print out MachineBasicBlock because parent MachineFunction is null\n";
+    return;
+  }
     const BasicBlock *LBB = getBasicBlock();
-    OS << "\n" << LBB->getName() << " (" << (const void*)LBB << "):\n";
+    if(LBB)
+      OS << "\n" << LBB->getName() << " (" << (const void*)this
+         << ", LLVM BB @" << (const void*) LBB << "):\n";
     for (const_iterator I = begin(); I != end(); ++I) {
         OS << "\t";
-        I->print(OS, MachineFunction::get(LBB->getParent()).getTarget());
+        I->print(OS, &getParent()->getTarget());
     }
 }