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//===-- llvm/CodeGen/MachineInstr.h - MachineInstr class --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the MachineInstr class, which is the
// basic representation for all target dependent machine instructions used by
// the back end.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEINSTR_H
#define LLVM_CODEGEN_MACHINEINSTR_H
#include "llvm/ADT/ilist.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/Target/TargetInstrDesc.h"
#include "llvm/Support/DebugLoc.h"
#include <list>
#include <vector>
namespace llvm {
class TargetInstrDesc;
class TargetInstrInfo;
class TargetRegisterInfo;
class MachineFunction;
//===----------------------------------------------------------------------===//
/// MachineInstr - Representation of each machine instruction.
///
class MachineInstr : public ilist_node<MachineInstr> {
const TargetInstrDesc *TID; // Instruction descriptor.
unsigned short NumImplicitOps; // Number of implicit operands (which
// are determined at construction time).
std::vector<MachineOperand> Operands; // the operands
std::list<MachineMemOperand> MemOperands; // information on memory references
MachineBasicBlock *Parent; // Pointer to the owning basic block.
DebugLoc debugLoc; // Source line information.
// OperandComplete - Return true if it's illegal to add a new operand
bool OperandsComplete() const;
MachineInstr(const MachineInstr&); // DO NOT IMPLEMENT
void operator=(const MachineInstr&); // DO NOT IMPLEMENT
// Intrusive list support
friend struct ilist_traits<MachineInstr>;
friend struct ilist_traits<MachineBasicBlock>;
void setParent(MachineBasicBlock *P) { Parent = P; }
/// MachineInstr ctor - This constructor creates a copy of the given
/// MachineInstr in the given MachineFunction.
MachineInstr(MachineFunction &, const MachineInstr &);
/// MachineInstr ctor - This constructor creates a dummy MachineInstr with
/// TID NULL and no operands.
MachineInstr();
// The next two constructors have DebugLoc and non-DebugLoc versions;
// over time, the non-DebugLoc versions should be phased out and eventually
// removed.
/// MachineInstr ctor - This constructor create a MachineInstr and add the
/// implicit operands. It reserves space for number of operands specified by
/// TargetInstrDesc. The version with a DebugLoc should be preferred.
explicit MachineInstr(const TargetInstrDesc &TID, bool NoImp = false);
/// MachineInstr ctor - Work exactly the same as the ctor above, except that
/// the MachineInstr is created and added to the end of the specified basic
/// block. The version with a DebugLoc should be preferred.
///
MachineInstr(MachineBasicBlock *MBB, const TargetInstrDesc &TID);
/// MachineInstr ctor - This constructor create a MachineInstr and add the
/// implicit operands. It reserves space for number of operands specified by
/// TargetInstrDesc. An explicit DebugLoc is supplied.
explicit MachineInstr(const TargetInstrDesc &TID, const DebugLoc dl,
bool NoImp = false);
/// MachineInstr ctor - Work exactly the same as the ctor above, except that
/// the MachineInstr is created and added to the end of the specified basic
/// block.
///
MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
const TargetInstrDesc &TID);
~MachineInstr();
// MachineInstrs are pool-allocated and owned by MachineFunction.
friend class MachineFunction;
public:
const MachineBasicBlock* getParent() const { return Parent; }
MachineBasicBlock* getParent() { return Parent; }
/// getDebugLoc - Returns the debug location id of this MachineInstr.
///
DebugLoc getDebugLoc() const { return debugLoc; }
/// getDesc - Returns the target instruction descriptor of this
/// MachineInstr.
const TargetInstrDesc &getDesc() const { return *TID; }
/// getOpcode - Returns the opcode of this MachineInstr.
///
int getOpcode() const { return TID->Opcode; }
/// Access to explicit operands of the instruction.
///
unsigned getNumOperands() const { return (unsigned)Operands.size(); }
const MachineOperand& getOperand(unsigned i) const {
assert(i < getNumOperands() && "getOperand() out of range!");
return Operands[i];
}
MachineOperand& getOperand(unsigned i) {
assert(i < getNumOperands() && "getOperand() out of range!");
return Operands[i];
}
/// getNumExplicitOperands - Returns the number of non-implicit operands.
///
unsigned getNumExplicitOperands() const;
/// Access to memory operands of the instruction
std::list<MachineMemOperand>::iterator memoperands_begin()
{ return MemOperands.begin(); }
std::list<MachineMemOperand>::iterator memoperands_end()
{ return MemOperands.end(); }
std::list<MachineMemOperand>::const_iterator memoperands_begin() const
{ return MemOperands.begin(); }
std::list<MachineMemOperand>::const_iterator memoperands_end() const
{ return MemOperands.end(); }
bool memoperands_empty() const { return MemOperands.empty(); }
/// hasOneMemOperand - Return true if this instruction has exactly one
/// MachineMemOperand.
bool hasOneMemOperand() const {
return !memoperands_empty() &&
next(memoperands_begin()) == memoperands_end();
}
/// isIdenticalTo - Return true if this instruction is identical to (same
/// opcode and same operands as) the specified instruction.
bool isIdenticalTo(const MachineInstr *Other) const {
if (Other->getOpcode() != getOpcode() ||
Other->getNumOperands() != getNumOperands())
return false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (!getOperand(i).isIdenticalTo(Other->getOperand(i)))
return false;
return true;
}
/// removeFromParent - This method unlinks 'this' from the containing basic
/// block, and returns it, but does not delete it.
MachineInstr *removeFromParent();
/// eraseFromParent - This method unlinks 'this' from the containing basic
/// block and deletes it.
void eraseFromParent();
/// isLabel - Returns true if the MachineInstr represents a label.
///
bool isLabel() const;
/// isDebugLabel - Returns true if the MachineInstr represents a debug label.
///
bool isDebugLabel() const;
/// readsRegister - Return true if the MachineInstr reads the specified
/// register. If TargetRegisterInfo is passed, then it also checks if there
/// is a read of a super-register.
bool readsRegister(unsigned Reg, const TargetRegisterInfo *TRI = NULL) const {
return findRegisterUseOperandIdx(Reg, false, TRI) != -1;
}
/// killsRegister - Return true if the MachineInstr kills the specified
/// register. If TargetRegisterInfo is passed, then it also checks if there is
/// a kill of a super-register.
bool killsRegister(unsigned Reg, const TargetRegisterInfo *TRI = NULL) const {
return findRegisterUseOperandIdx(Reg, true, TRI) != -1;
}
/// modifiesRegister - Return true if the MachineInstr modifies the
/// specified register. If TargetRegisterInfo is passed, then it also checks
/// if there is a def of a super-register.
bool modifiesRegister(unsigned Reg,
const TargetRegisterInfo *TRI = NULL) const {
return findRegisterDefOperandIdx(Reg, false, TRI) != -1;
}
/// registerDefIsDead - Returns true if the register is dead in this machine
/// instruction. If TargetRegisterInfo is passed, then it also checks
/// if there is a dead def of a super-register.
bool registerDefIsDead(unsigned Reg,
const TargetRegisterInfo *TRI = NULL) const {
return findRegisterDefOperandIdx(Reg, true, TRI) != -1;
}
/// findRegisterUseOperandIdx() - Returns the operand index that is a use of
/// the specific register or -1 if it is not found. It further tightening
/// the search criteria to a use that kills the register if isKill is true.
int findRegisterUseOperandIdx(unsigned Reg, bool isKill = false,
const TargetRegisterInfo *TRI = NULL) const;
/// findRegisterUseOperand - Wrapper for findRegisterUseOperandIdx, it returns
/// a pointer to the MachineOperand rather than an index.
MachineOperand *findRegisterUseOperand(unsigned Reg, bool isKill = false,
const TargetRegisterInfo *TRI = NULL) {
int Idx = findRegisterUseOperandIdx(Reg, isKill, TRI);
return (Idx == -1) ? NULL : &getOperand(Idx);
}
/// findRegisterDefOperandIdx() - Returns the operand index that is a def of
/// the specified register or -1 if it is not found. If isDead is true, defs
/// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
/// also checks if there is a def of a super-register.
int findRegisterDefOperandIdx(unsigned Reg, bool isDead = false,
const TargetRegisterInfo *TRI = NULL) const;
/// findRegisterDefOperand - Wrapper for findRegisterDefOperandIdx, it returns
/// a pointer to the MachineOperand rather than an index.
MachineOperand *findRegisterDefOperand(unsigned Reg, bool isDead = false,
const TargetRegisterInfo *TRI = NULL) {
int Idx = findRegisterDefOperandIdx(Reg, isDead, TRI);
return (Idx == -1) ? NULL : &getOperand(Idx);
}
/// findFirstPredOperandIdx() - Find the index of the first operand in the
/// operand list that is used to represent the predicate. It returns -1 if
/// none is found.
int findFirstPredOperandIdx() const;
/// isRegTiedToUseOperand - Given the index of a register def operand,
/// check if the register def is tied to a source operand, due to either
/// two-address elimination or inline assembly constraints. Returns the
/// first tied use operand index by reference is UseOpIdx is not null.
bool isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx = 0) const;
/// isRegTiedToDefOperand - Return true if the use operand of the specified
/// index is tied to an def operand. It also returns the def operand index by
/// reference if DefOpIdx is not null.
bool isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx = 0) const;
/// copyKillDeadInfo - Copies kill / dead operand properties from MI.
///
void copyKillDeadInfo(const MachineInstr *MI);
/// copyPredicates - Copies predicate operand(s) from MI.
void copyPredicates(const MachineInstr *MI);
/// addRegisterKilled - We have determined MI kills a register. Look for the
/// 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,
const TargetRegisterInfo *RegInfo,
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. 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, const TargetRegisterInfo *RegInfo,
bool AddIfNotFound = false);
/// isSafeToMove - Return true if it is safe to move this instruction. If
/// SawStore is set to true, it means that there is a store (or call) between
/// the instruction's location and its intended destination.
bool isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) const;
/// isSafeToReMat - Return true if it's safe to rematerialize the specified
/// instruction which defined the specified register instead of copying it.
bool isSafeToReMat(const TargetInstrInfo *TII, unsigned DstReg) const;
/// hasVolatileMemoryRef - Return true if this instruction may have a
/// volatile memory reference, or if the information describing the
/// memory reference is not available. Return false if it is known to
/// have no volatile memory references.
bool hasVolatileMemoryRef() const;
//
// Debugging support
//
void print(std::ostream *OS, const TargetMachine *TM) const {
if (OS) print(*OS, TM);
}
void print(std::ostream &OS, const TargetMachine *TM = 0) const;
void print(std::ostream *OS) const { if (OS) print(*OS); }
void print(raw_ostream *OS, const TargetMachine *TM) const {
if (OS) print(*OS, TM);
}
void print(raw_ostream &OS, const TargetMachine *TM = 0) const;
void print(raw_ostream *OS) const { if (OS) print(*OS); }
void dump() const;
//===--------------------------------------------------------------------===//
// Accessors used to build up machine instructions.
/// addOperand - Add the specified operand to the instruction. If it is an
/// implicit operand, it is added to the end of the operand list. If it is
/// an explicit operand it is added at the end of the explicit operand list
/// (before the first implicit operand).
void addOperand(const MachineOperand &Op);
/// setDesc - Replace the instruction descriptor (thus opcode) of
/// the current instruction with a new one.
///
void setDesc(const TargetInstrDesc &tid) { TID = &tid; }
/// setDebugLoc - Replace current source information with new such.
/// Avoid using this, the constructor argument is preferable.
///
void setDebugLoc(const DebugLoc dl) { debugLoc = dl; }
/// RemoveOperand - Erase an operand from an instruction, leaving it with one
/// fewer operand than it started with.
///
void RemoveOperand(unsigned i);
/// addMemOperand - Add a MachineMemOperand to the machine instruction,
/// referencing arbitrary storage.
void addMemOperand(MachineFunction &MF,
const MachineMemOperand &MO);
/// clearMemOperands - Erase all of this MachineInstr's MachineMemOperands.
void clearMemOperands(MachineFunction &MF);
private:
/// getRegInfo - If this instruction is embedded into a MachineFunction,
/// return the MachineRegisterInfo object for the current function, otherwise
/// return null.
MachineRegisterInfo *getRegInfo();
/// addImplicitDefUseOperands - Add all implicit def and use operands to
/// this instruction.
void addImplicitDefUseOperands();
/// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands already be on their use lists.
void RemoveRegOperandsFromUseLists();
/// AddRegOperandsToUseLists - Add all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands not be on their use lists yet.
void AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo);
};
//===----------------------------------------------------------------------===//
// Debugging Support
inline std::ostream& operator<<(std::ostream &OS, const MachineInstr &MI) {
MI.print(OS);
return OS;
}
inline raw_ostream& operator<<(raw_ostream &OS, const MachineInstr &MI) {
MI.print(OS);
return OS;
}
} // End llvm namespace
#endif
|