llvm-6502/include/llvm/CodeGen/MachineInstr.h
2002-04-09 18:00:49 +00:00

502 lines
15 KiB
C++

//===-- llvm/CodeGen/MachineInstr.h - MachineInstr class ---------*- C++ -*--=//
//
// This file contains the declaration of the MachineInstr class, which is the
// basic representation for all target dependant machine instructions used by
// the back end.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEINSTR_H
#define LLVM_CODEGEN_MACHINEINSTR_H
#include "llvm/Target/MachineInstrInfo.h"
#include <iterator>
class Instruction;
//---------------------------------------------------------------------------
// class MachineOperand
//
// Purpose:
// Representation of each machine instruction operand.
// This class is designed so that you can allocate a vector of operands
// first and initialize each one later.
//
// E.g, for this VM instruction:
// ptr = alloca type, numElements
// we generate 2 machine instructions on the SPARC:
//
// mul Constant, Numelements -> Reg
// add %sp, Reg -> Ptr
//
// Each instruction has 3 operands, listed above. Of those:
// - Reg, NumElements, and Ptr are of operand type MO_Register.
// - Constant is of operand type MO_SignExtendedImmed on the SPARC.
//
// For the register operands, the virtual register type is as follows:
//
// - Reg will be of virtual register type MO_MInstrVirtualReg. The field
// MachineInstr* minstr will point to the instruction that computes reg.
//
// - %sp will be of virtual register type MO_MachineReg.
// The field regNum identifies the machine register.
//
// - NumElements will be of virtual register type MO_VirtualReg.
// The field Value* value identifies the value.
//
// - Ptr will also be of virtual register type MO_VirtualReg.
// Again, the field Value* value identifies the value.
//
//---------------------------------------------------------------------------
class MachineOperand {
public:
enum MachineOperandType {
MO_VirtualRegister, // virtual register for *value
MO_MachineRegister, // pre-assigned machine register `regNum'
MO_CCRegister,
MO_SignExtendedImmed,
MO_UnextendedImmed,
MO_PCRelativeDisp,
};
private:
MachineOperandType opType;
union {
Value* value; // BasicBlockVal for a label operand.
// ConstantVal for a non-address immediate.
// Virtual register for an SSA operand,
// including hidden operands required for
// the generated machine code.
int64_t immedVal; // constant value for an explicit constant
};
int regNum; // register number for an explicit register
// will be set for a value after reg allocation
bool isDef; // is this a defition for the value
public:
/*ctor*/ MachineOperand ();
/*ctor*/ MachineOperand (MachineOperandType operandType,
Value* _val);
/*copy ctor*/ MachineOperand (const MachineOperand&);
/*dtor*/ ~MachineOperand () {}
// Accessor methods. Caller is responsible for checking the
// operand type before invoking the corresponding accessor.
//
inline MachineOperandType getOperandType() const {
return opType;
}
inline Value* getVRegValue () const {
assert(opType == MO_VirtualRegister || opType == MO_CCRegister ||
opType == MO_PCRelativeDisp);
return value;
}
inline int getMachineRegNum() const {
assert(opType == MO_MachineRegister);
return regNum;
}
inline int64_t getImmedValue () const {
assert(opType == MO_SignExtendedImmed || opType == MO_UnextendedImmed);
return immedVal;
}
inline bool opIsDef () const {
return isDef;
}
public:
friend std::ostream& operator<<(std::ostream& os, const MachineOperand& mop);
private:
// These functions are provided so that a vector of operands can be
// statically allocated and individual ones can be initialized later.
// Give class MachineInstr gets access to these functions.
//
void Initialize (MachineOperandType operandType,
Value* _val);
void InitializeConst (MachineOperandType operandType,
int64_t intValue);
void InitializeReg (int regNum,
bool isCCReg);
friend class MachineInstr;
public:
// replaces the Value with its corresponding physical register after
// register allocation is complete
void setRegForValue(int reg) {
assert(opType == MO_VirtualRegister || opType == MO_CCRegister ||
opType == MO_MachineRegister);
regNum = reg;
}
// used to get the reg number if when one is allocted (must be
// called only after reg alloc)
inline int getAllocatedRegNum() const {
assert(opType == MO_VirtualRegister || opType == MO_CCRegister ||
opType == MO_MachineRegister);
return regNum;
}
};
inline
MachineOperand::MachineOperand()
: opType(MO_VirtualRegister),
immedVal(0),
regNum(-1),
isDef(false)
{}
inline
MachineOperand::MachineOperand(MachineOperandType operandType,
Value* _val)
: opType(operandType),
immedVal(0),
regNum(-1),
isDef(false)
{}
inline
MachineOperand::MachineOperand(const MachineOperand& mo)
: opType(mo.opType),
isDef(false)
{
switch(opType) {
case MO_VirtualRegister:
case MO_CCRegister: value = mo.value; break;
case MO_MachineRegister: regNum = mo.regNum; break;
case MO_SignExtendedImmed:
case MO_UnextendedImmed:
case MO_PCRelativeDisp: immedVal = mo.immedVal; break;
default: assert(0);
}
}
inline void
MachineOperand::Initialize(MachineOperandType operandType,
Value* _val)
{
opType = operandType;
value = _val;
regNum = -1;
}
inline void
MachineOperand::InitializeConst(MachineOperandType operandType,
int64_t intValue)
{
opType = operandType;
value = NULL;
immedVal = intValue;
regNum = -1;
}
inline void
MachineOperand::InitializeReg(int _regNum, bool isCCReg)
{
opType = isCCReg? MO_CCRegister : MO_MachineRegister;
value = NULL;
regNum = (int) _regNum;
}
//---------------------------------------------------------------------------
// class MachineInstr
//
// Purpose:
// Representation of each machine instruction.
//
// MachineOpCode must be an enum, defined separately for each target.
// E.g., It is defined in SparcInstructionSelection.h for the SPARC.
//
// opCodeMask is used to record variants of an instruction.
// E.g., each branch instruction on SPARC has 2 flags (i.e., 4 variants):
// ANNUL: if 1: Annul delay slot instruction.
// PREDICT-NOT-TAKEN: if 1: predict branch not taken.
// Instead of creating 4 different opcodes for BNZ, we create a single
// opcode and set bits in opCodeMask for each of these flags.
//
// There are 2 kinds of operands:
//
// (1) Explicit operands of the machine instruction in vector operands[]
//
// (2) "Implicit operands" are values implicitly used or defined by the
// machine instruction, such as arguments to a CALL, return value of
// a CALL (if any), and return value of a RETURN.
//---------------------------------------------------------------------------
class MachineInstr : public NonCopyable {
MachineOpCode opCode;
OpCodeMask opCodeMask; // extra bits for variants of an opcode
std::vector<MachineOperand> operands;
std::vector<Value*> implicitRefs; // values implicitly referenced by this
std::vector<bool> implicitIsDef; // machine instruction (eg, call args)
public:
/*ctor*/ MachineInstr (MachineOpCode _opCode,
OpCodeMask _opCodeMask = 0x0);
/*ctor*/ MachineInstr (MachineOpCode _opCode,
unsigned numOperands,
OpCodeMask _opCodeMask = 0x0);
inline ~MachineInstr () {}
const MachineOpCode getOpCode () const { return opCode; }
//
// Information about explicit operands of the instruction
//
unsigned int getNumOperands () const { return operands.size(); }
bool operandIsDefined(unsigned i) const;
const MachineOperand& getOperand (unsigned i) const;
MachineOperand& getOperand (unsigned i);
//
// Information about implicit operands of the instruction
//
unsigned getNumImplicitRefs() const{return implicitRefs.size();}
bool implicitRefIsDefined(unsigned i) const;
const Value* getImplicitRef (unsigned i) const;
Value* getImplicitRef (unsigned i);
//
// Debugging support
//
void dump (unsigned int indent = 0) const;
friend std::ostream& operator<<(std::ostream& os, const MachineInstr& minstr);
//
// Define iterators to access the Value operands of the Machine Instruction.
// begin() and end() are defined to produce these iterators...
//
template<class _MI, class _V> class ValOpIterator;
typedef ValOpIterator<const MachineInstr*,const Value*> const_val_op_iterator;
typedef ValOpIterator< MachineInstr*, Value*> val_op_iterator;
// Access to set the operands when building the machine instruction
void SetMachineOperandVal(unsigned i,
MachineOperand::MachineOperandType operandType,
Value* _val, bool isDef=false);
void SetMachineOperandConst(unsigned i,
MachineOperand::MachineOperandType operandType,
int64_t intValue);
void SetMachineOperandReg(unsigned i,
int regNum,
bool isDef=false,
bool isCCReg=false);
void addImplicitRef (Value* val,
bool isDef=false);
void setImplicitRef (unsigned i,
Value* val,
bool isDef=false);
template<class MITy, class VTy>
class ValOpIterator : public std::forward_iterator<VTy, ptrdiff_t> {
unsigned i;
MITy MI;
inline void skipToNextVal() {
while (i < MI->getNumOperands() &&
!((MI->getOperand(i).getOperandType() == MachineOperand::MO_VirtualRegister ||
MI->getOperand(i).getOperandType() == MachineOperand::MO_CCRegister)
&& MI->getOperand(i).getVRegValue() != 0))
++i;
}
inline ValOpIterator(MITy mi, unsigned I) : i(I), MI(mi) {
skipToNextVal();
}
public:
typedef ValOpIterator<MITy, VTy> _Self;
inline VTy operator*() const { return MI->getOperand(i).getVRegValue(); }
const MachineOperand &getMachineOperand() const {
return MI->getOperand(i);
}
inline VTy operator->() const { return operator*(); }
inline bool isDef() const { return MI->getOperand(i).opIsDef(); }
inline _Self& operator++() { i++; skipToNextVal(); return *this; }
inline _Self operator++(int) { _Self tmp = *this; ++*this; return tmp; }
inline bool operator==(const _Self &y) const {
return i == y.i;
}
inline bool operator!=(const _Self &y) const {
return !operator==(y);
}
static _Self begin(MITy MI) {
return _Self(MI, 0);
}
static _Self end(MITy MI) {
return _Self(MI, MI->getNumOperands());
}
};
// define begin() and end()
val_op_iterator begin() { return val_op_iterator::begin(this); }
val_op_iterator end() { return val_op_iterator::end(this); }
const_val_op_iterator begin() const {
return const_val_op_iterator::begin(this);
}
const_val_op_iterator end() const {
return const_val_op_iterator::end(this);
}
};
inline MachineOperand&
MachineInstr::getOperand(unsigned int i)
{
assert(i < operands.size() && "getOperand() out of range!");
return operands[i];
}
inline const MachineOperand&
MachineInstr::getOperand(unsigned int i) const
{
assert(i < operands.size() && "getOperand() out of range!");
return operands[i];
}
inline bool
MachineInstr::operandIsDefined(unsigned int i) const
{
return getOperand(i).opIsDef();
}
inline bool
MachineInstr::implicitRefIsDefined(unsigned int i) const
{
assert(i < implicitIsDef.size() && "operand out of range!");
return implicitIsDef[i];
}
inline const Value*
MachineInstr::getImplicitRef(unsigned int i) const
{
assert(i < implicitRefs.size() && "getImplicitRef() out of range!");
return implicitRefs[i];
}
inline Value*
MachineInstr::getImplicitRef(unsigned int i)
{
assert(i < implicitRefs.size() && "getImplicitRef() out of range!");
return implicitRefs[i];
}
inline void
MachineInstr::addImplicitRef(Value* val,
bool isDef)
{
implicitRefs.push_back(val);
implicitIsDef.push_back(isDef);
}
inline void
MachineInstr::setImplicitRef(unsigned int i,
Value* val,
bool isDef)
{
assert(i < implicitRefs.size() && "setImplicitRef() out of range!");
implicitRefs[i] = val;
implicitIsDef[i] = isDef;
}
//---------------------------------------------------------------------------
// class MachineCodeForBasicBlock
//
// Purpose:
// Representation of the sequence of machine instructions created
// for a basic block.
//---------------------------------------------------------------------------
class MachineCodeForBasicBlock {
std::vector<MachineInstr*> Insts;
public:
~MachineCodeForBasicBlock() {
#if 0
for (unsigned i = 0, e = Insts.size(); i != e; ++i)
delete Insts[i];
#endif
}
typedef std::vector<MachineInstr*>::iterator iterator;
typedef std::vector<MachineInstr*>::const_iterator const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
unsigned size() const { return Insts.size(); }
bool empty() const { return Insts.empty(); }
MachineInstr * operator[](unsigned i) const { return Insts[i]; }
MachineInstr *&operator[](unsigned i) { return Insts[i]; }
MachineInstr *front() const { return Insts.front(); }
MachineInstr *back() const { return Insts.back(); }
iterator begin() { return Insts.begin(); }
const_iterator begin() const { return Insts.begin(); }
iterator end() { return Insts.end(); }
const_iterator end() const { return Insts.end(); }
reverse_iterator rbegin() { return Insts.rbegin(); }
const_reverse_iterator rbegin() const { return Insts.rbegin(); }
reverse_iterator rend () { return Insts.rend(); }
const_reverse_iterator rend () const { return Insts.rend(); }
void push_back(MachineInstr *MI) { Insts.push_back(MI); }
template<typename IT>
void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }
// erase - Remove the specified range from the instruction list. This does
// not delete in instructions removed.
//
iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }
MachineInstr *pop_back() {
MachineInstr *R = back();
Insts.pop_back();
return R;
}
};
//---------------------------------------------------------------------------
// Debugging Support
//---------------------------------------------------------------------------
std::ostream& operator<< (std::ostream& os, const MachineInstr& minstr);
std::ostream& operator<< (std::ostream& os, const MachineOperand& mop);
void PrintMachineInstructions(const Function *F);
#endif