class LiveVariables : public MachineFunctionPass {
public:
+ static const int ID; // Pass identifcation, replacement for typeid
+ LiveVariables() : MachineFunctionPass((intptr_t)&ID) {}
+
/// VarInfo - This represents the regions where a virtual register is live in
/// the program. We represent this with three different pieces of
/// information: the instruction that uniquely defines the value, the set of
SmallVector<unsigned, 4> *PHIVarInfo;
/// addRegisterKilled - We have determined MI kills a register. Look for the
- /// operand that uses it and mark it as IsKill.
- void addRegisterKilled(unsigned IncomingReg, MachineInstr *MI);
+ /// operand that uses it and mark it as IsKill. If AddIfNotFound is true,
+ /// add a implicit operand if it's not found. Returns true if the operand
+ /// exists / is added.
+ bool addRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
+ bool AddIfNotFound = false);
/// addRegisterDead - We have determined MI defined a register without a use.
- /// Look for the operand that defines it and mark it as IsDead.
- void addRegisterDead(unsigned IncomingReg, MachineInstr *MI);
+ /// Look for the operand that defines it and mark it as IsDead. If
+ /// AddIfNotFound is true, add a implicit operand if it's not found. Returns
+ /// true if the operand exists / is added.
+ bool addRegisterDead(unsigned IncomingReg, MachineInstr *MI,
+ bool AddIfNotFound = false);
void HandlePhysRegUse(unsigned Reg, MachineInstr *MI);
void HandlePhysRegDef(unsigned Reg, MachineInstr *MI);
/// addVirtualRegisterKilled - Add information about the fact that the
/// specified register is killed after being used by the specified
- /// instruction.
- ///
- void addVirtualRegisterKilled(unsigned IncomingReg, MachineInstr *MI) {
- addRegisterKilled(IncomingReg, MI);
- getVarInfo(IncomingReg).Kills.push_back(MI);
+ /// instruction. If AddIfNotFound is true, add a implicit operand if it's
+ /// not found.
+ void addVirtualRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
+ bool AddIfNotFound = false) {
+ if (addRegisterKilled(IncomingReg, MI, AddIfNotFound))
+ getVarInfo(IncomingReg).Kills.push_back(MI);
}
/// removeVirtualRegisterKilled - Remove the specified virtual
void removeVirtualRegistersKilled(MachineInstr *MI);
/// addVirtualRegisterDead - Add information about the fact that the specified
- /// register is dead after being used by the specified instruction.
- ///
- void addVirtualRegisterDead(unsigned IncomingReg, MachineInstr *MI) {
- addRegisterDead(IncomingReg, MI);
- getVarInfo(IncomingReg).Kills.push_back(MI);
+ /// register is dead after being used by the specified instruction. If
+ /// AddIfNotFound is true, add a implicit operand if it's not found.
+ void addVirtualRegisterDead(unsigned IncomingReg, MachineInstr *MI,
+ bool AddIfNotFound = false) {
+ if (addRegisterDead(IncomingReg, MI, AddIfNotFound))
+ getVarInfo(IncomingReg).Kills.push_back(MI);
}
/// removeVirtualRegisterDead - Remove the specified virtual