//===-- llvm/CodeGen/MachineInstr.h - MachineInstr class --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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/iterator"
#include "llvm/Support/DataTypes.h"
#include <vector>
#include <cassert>
namespace llvm {
class Value;
class Function;
class MachineBasicBlock;
class TargetMachine;
class GlobalValue;
template <typename T> struct ilist_traits;
template <typename T> struct ilist;
//===----------------------------------------------------------------------===//
// class MachineOperand
//
// Representation of each machine instruction operand.
//
struct MachineOperand {
private:
// Bit fields of the flags variable used for different operand properties
enum {
DEFFLAG = 0x01, // this is a def of the operand
USEFLAG = 0x02 // this is a use of the operand
};
public:
// UseType - This enum describes how the machine operand is used by
// the instruction. Note that the MachineInstr/Operator class
// currently uses bool arguments to represent this information
// instead of an enum. Eventually this should change over to use
// this _easier to read_ representation instead.
//
enum UseType {
Use = USEFLAG, /// only read
Def = DEFFLAG, /// only written
UseAndDef = Use | Def /// read AND written
};
enum MachineOperandType {
MO_Register, // Register operand.
MO_Immediate, // Immediate Operand
MO_MachineBasicBlock, // MachineBasicBlock reference
MO_FrameIndex, // Abstract Stack Frame Index
MO_ConstantPoolIndex, // Address of indexed Constant in Constant Pool
MO_JumpTableIndex, // Address of indexed Jump Table for switch
MO_ExternalSymbol, // Name of external global symbol
MO_GlobalAddress // Address of a global value
};
private:
union {
GlobalValue *GV; // For MO_GlobalAddress.
MachineBasicBlock *MBB; // For MO_MachineBasicBlock.
const char *SymbolName; // For MO_ExternalSymbol.
unsigned RegNo; // For MO_Register.
int64_t immedVal; // For MO_Immediate and MO_*Index.
} contents;
char flags; // see bit field definitions above
MachineOperandType opType:8; // Pack into 8 bits efficiently after flags.
/// offset - Offset to address of global or external, only valid for
/// MO_GlobalAddress, MO_ExternalSym and MO_ConstantPoolIndex
int offset;
MachineOperand() {}
public:
MachineOperand(const MachineOperand &M) {
*this = M;
}
~MachineOperand() {}
const MachineOperand &operator=(const MachineOperand &MO) {
contents = MO.contents;
flags = MO.flags;
opType = MO.opType;
offset = MO.offset;
return *this;
}
/// getType - Returns the MachineOperandType for this operand.
///
MachineOperandType getType() const { return opType; }
/// getUseType - Returns the MachineOperandUseType of this operand.
///
UseType getUseType() const { return UseType(flags & (USEFLAG|DEFFLAG)); }
/// Accessors that tell you what kind of MachineOperand you're looking at.
///
bool isRegister() const { return opType == MO_Register; }
bool isImmediate() const { return opType == MO_Immediate; }
bool isMachineBasicBlock() const { return opType == MO_MachineBasicBlock; }
bool isFrameIndex() const { return opType == MO_FrameIndex; }
bool isConstantPoolIndex() const { return opType == MO_ConstantPoolIndex; }
bool isJumpTableIndex() const { return opType == MO_JumpTableIndex; }
bool isGlobalAddress() const { return opType == MO_GlobalAddress; }
bool isExternalSymbol() const { return opType == MO_ExternalSymbol; }
int64_t getImmedValue() const {
assert(isImmediate() && "Wrong MachineOperand accessor");
return contents.immedVal;
}
MachineBasicBlock *getMachineBasicBlock() const {
assert(isMachineBasicBlock() && "Wrong MachineOperand accessor");
return contents.MBB;
}
void setMachineBasicBlock(MachineBasicBlock *MBB) {
assert(isMachineBasicBlock() && "Wrong MachineOperand accessor");
contents.MBB = MBB;
}
int getFrameIndex() const {
assert(isFrameIndex() && "Wrong MachineOperand accessor");
return (int)contents.immedVal;
}
unsigned getConstantPoolIndex() const {
assert(isConstantPoolIndex() && "Wrong MachineOperand accessor");
return (unsigned)contents.immedVal;
}
unsigned getJumpTableIndex() const {
assert(isJumpTableIndex() && "Wrong MachineOperand accessor");
return (unsigned)contents.immedVal;
}
GlobalValue *getGlobal() const {
assert(isGlobalAddress() && "Wrong MachineOperand accessor");
return contents.GV;
}
int getOffset() const {
assert((isGlobalAddress() || isExternalSymbol() || isConstantPoolIndex()) &&
"Wrong MachineOperand accessor");
return offset;
}
const char *getSymbolName() const {
assert(isExternalSymbol() && "Wrong MachineOperand accessor");
return contents.SymbolName;
}
/// MachineOperand methods for testing that work on any kind of
/// MachineOperand...
///
bool isUse () const { return flags & USEFLAG; }
MachineOperand& setUse () { flags |= USEFLAG; return *this; }
bool isDef () const { return flags & DEFFLAG; }
MachineOperand& setDef () { flags |= DEFFLAG; return *this; }
/// getReg - Returns the register number.
///
unsigned getReg() const {
assert(isRegister() && "This is not a register operand!");
return contents.RegNo;
}
/// MachineOperand mutators.
///
void setReg(unsigned Reg) {
assert(isRegister() && "This is not a register operand!");
contents.RegNo = Reg;
}
void setImmedValue(int64_t immVal) {
assert(isImmediate() && "Wrong MachineOperand mutator");
contents.immedVal = immVal;
}
void setOffset(int Offset) {
assert((isGlobalAddress() || isExternalSymbol() || isConstantPoolIndex() ||
isJumpTableIndex()) &&
"Wrong MachineOperand accessor");
offset = Offset;
}
/// ChangeToImmediate - Replace this operand with a new immediate operand of
/// the specified value. If an operand is known to be an immediate already,
/// the setImmedValue method should be used.
void ChangeToImmediate(int64_t ImmVal) {
opType = MO_Immediate;
contents.immedVal = ImmVal;
}
/// ChangeToRegister - Replace this operand with a new register operand of
/// the specified value. If an operand is known to be an register already,
/// the setReg method should be used.
void ChangeToRegister(unsigned Reg) {
opType = MO_Register;
contents.RegNo = Reg;
}
friend std::ostream& operator<<(std::ostream& os, const MachineOperand& mop);
friend class MachineInstr;
};
//===----------------------------------------------------------------------===//
/// MachineInstr - Representation of each machine instruction.
///
class MachineInstr {
short Opcode; // the opcode
std::vector<MachineOperand> Operands; // the operands
MachineInstr* prev, *next; // links for our intrusive list
MachineBasicBlock* parent; // pointer to the owning basic block
// OperandComplete - Return true if it's illegal to add a new operand
bool OperandsComplete() const;
MachineInstr(const MachineInstr&);
void operator=(const MachineInstr&); // DO NOT IMPLEMENT
// Intrusive list support
//
friend struct ilist_traits<MachineInstr>;
public:
/// MachineInstr ctor - This constructor reserve's space for numOperand
/// operands.
MachineInstr(short Opcode, unsigned numOperands);
/// 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, short Opcode, unsigned numOps);
~MachineInstr();
const MachineBasicBlock* getParent() const { return parent; }
MachineBasicBlock* getParent() { return parent; }
/// getOpcode - Returns the opcode of this MachineInstr.
///
const int getOpcode() const { return Opcode; }
/// Access to explicit operands of the instruction.
///
unsigned getNumOperands() const { return 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];
}
/// clone - Create a copy of 'this' instruction that is identical in
/// all ways except the the instruction has no parent, prev, or next.
MachineInstr* clone() const { return new MachineInstr(*this); }
/// 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() {
delete removeFromParent();
}
//
// Debugging support
//
void print(std::ostream &OS, const TargetMachine *TM) const;
void dump() const;
friend std::ostream& operator<<(std::ostream& os, const MachineInstr& minstr);
//===--------------------------------------------------------------------===//
// Accessors to add operands when building up machine instructions.
//
/// addRegOperand - Add a register operand.
///
void addRegOperand(unsigned Reg,
MachineOperand::UseType UTy = MachineOperand::Use) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_Register;
Op.flags = UTy;
Op.contents.RegNo = Reg;
Op.offset = 0;
}
/// addImmOperand - Add a zero extended constant argument to the
/// machine instruction.
///
void addImmOperand(int64_t Val) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_Immediate;
Op.flags = 0;
Op.contents.immedVal = Val;
Op.offset = 0;
}
void addMachineBasicBlockOperand(MachineBasicBlock *MBB) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_MachineBasicBlock;
Op.flags = 0;
Op.contents.MBB = MBB;
Op.offset = 0;
}
/// addFrameIndexOperand - Add an abstract frame index to the instruction
///
void addFrameIndexOperand(unsigned Idx) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_FrameIndex;
Op.flags = 0;
Op.contents.immedVal = Idx;
Op.offset = 0;
}
/// addConstantPoolndexOperand - Add a constant pool object index to the
/// instruction.
///
void addConstantPoolIndexOperand(unsigned Idx, int Offset) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_ConstantPoolIndex;
Op.flags = 0;
Op.contents.immedVal = Idx;
Op.offset = Offset;
}
/// addJumpTableIndexOperand - Add a jump table object index to the
/// instruction.
///
void addJumpTableIndexOperand(unsigned Idx) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_JumpTableIndex;
Op.flags = 0;
Op.contents.immedVal = Idx;
Op.offset = 0;
}
void addGlobalAddressOperand(GlobalValue *GV, int Offset) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_GlobalAddress;
Op.flags = 0;
Op.contents.GV = GV;
Op.offset = Offset;
}
/// addExternalSymbolOperand - Add an external symbol operand to this instr
///
void addExternalSymbolOperand(const char *SymName) {
MachineOperand &Op = AddNewOperand();
Op.opType = MachineOperand::MO_ExternalSymbol;
Op.flags = 0;
Op.contents.SymbolName = SymName;
Op.offset = 0;
}
//===--------------------------------------------------------------------===//
// Accessors used to modify instructions in place.
//
/// setOpcode - Replace the opcode of the current instruction with a new one.
///
void setOpcode(unsigned Op) { Opcode = Op; }
/// RemoveOperand - Erase an operand from an instruction, leaving it with one
/// fewer operand than it started with.
///
void RemoveOperand(unsigned i) {
Operands.erase(Operands.begin()+i);
}
private:
MachineOperand &AddNewOperand() {
assert(!OperandsComplete() &&
"Trying to add an operand to a machine instr that is already done!");
Operands.push_back(MachineOperand());
return Operands.back();
}
};
//===----------------------------------------------------------------------===//
// Debugging Support
std::ostream& operator<<(std::ostream &OS, const MachineInstr &MI);
std::ostream& operator<<(std::ostream &OS, const MachineOperand &MO);
} // End llvm namespace
#endif