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//===- CodeGenInstruction.h - Instruction Class Wrapper ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a wrapper class for the 'Instruction' TableGen class.
//
//===----------------------------------------------------------------------===//
#ifndef CODEGEN_INSTRUCTION_H
#define CODEGEN_INSTRUCTION_H
#include "llvm/CodeGen/ValueTypes.h"
#include <string>
#include <vector>
#include <utility>
namespace llvm {
class Record;
class DagInit;
class CodeGenInstruction {
public:
Record *TheDef; // The actual record defining this instruction.
std::string Namespace; // The namespace the instruction is in.
/// AsmString - The format string used to emit a .s file for the
/// instruction.
std::string AsmString;
class ConstraintInfo {
enum { None, EarlyClobber, Tied } Kind;
unsigned OtherTiedOperand;
public:
ConstraintInfo() : Kind(None) {}
static ConstraintInfo getEarlyClobber() {
ConstraintInfo I;
I.Kind = EarlyClobber;
I.OtherTiedOperand = 0;
return I;
}
static ConstraintInfo getTied(unsigned Op) {
ConstraintInfo I;
I.Kind = Tied;
I.OtherTiedOperand = Op;
return I;
}
bool isNone() const { return Kind == None; }
bool isEarlyClobber() const { return Kind == EarlyClobber; }
bool isTied() const { return Kind == Tied; }
unsigned getTiedOperand() const {
assert(isTied());
return OtherTiedOperand;
}
};
/// OperandInfo - The information we keep track of for each operand in the
/// operand list for a tablegen instruction.
struct OperandInfo {
/// Rec - The definition this operand is declared as.
///
Record *Rec;
/// Name - If this operand was assigned a symbolic name, this is it,
/// otherwise, it's empty.
std::string Name;
/// PrinterMethodName - The method used to print operands of this type in
/// the asmprinter.
std::string PrinterMethodName;
/// MIOperandNo - Currently (this is meant to be phased out), some logical
/// operands correspond to multiple MachineInstr operands. In the X86
/// target for example, one address operand is represented as 4
/// MachineOperands. Because of this, the operand number in the
/// OperandList may not match the MachineInstr operand num. Until it
/// does, this contains the MI operand index of this operand.
unsigned MIOperandNo;
unsigned MINumOperands; // The number of operands.
/// DoNotEncode - Bools are set to true in this vector for each operand in
/// the DisableEncoding list. These should not be emitted by the code
/// emitter.
std::vector<bool> DoNotEncode;
/// MIOperandInfo - Default MI operand type. Note an operand may be made
/// up of multiple MI operands.
DagInit *MIOperandInfo;
/// Constraint info for this operand. This operand can have pieces, so we
/// track constraint info for each.
std::vector<ConstraintInfo> Constraints;
OperandInfo(Record *R, const std::string &N, const std::string &PMN,
unsigned MION, unsigned MINO, DagInit *MIOI)
: Rec(R), Name(N), PrinterMethodName(PMN), MIOperandNo(MION),
MINumOperands(MINO), MIOperandInfo(MIOI) {}
};
/// NumDefs - Number of def operands declared.
///
unsigned NumDefs;
/// OperandList - The list of declared operands, along with their declared
/// type (which is a record).
std::vector<OperandInfo> OperandList;
// Various boolean values we track for the instruction.
bool isReturn;
bool isBranch;
bool isIndirectBranch;
bool isBarrier;
bool isCall;
bool canFoldAsLoad;
bool mayLoad, mayStore;
bool isPredicable;
bool isConvertibleToThreeAddress;
bool isCommutable;
bool isTerminator;
bool isReMaterializable;
bool hasDelaySlot;
bool usesCustomInserter;
bool isVariadic;
bool hasCtrlDep;
bool isNotDuplicable;
bool hasOptionalDef;
bool hasSideEffects;
bool neverHasSideEffects;
bool isAsCheapAsAMove;
bool hasExtraSrcRegAllocReq;
bool hasExtraDefRegAllocReq;
/// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
/// where $foo is a whole operand and $foo.bar refers to a suboperand.
/// This throws an exception if the name is invalid. If AllowWholeOp is
/// true, references to operands with suboperands are allowed, otherwise
/// not.
std::pair<unsigned,unsigned> ParseOperandName(const std::string &Op,
bool AllowWholeOp = true);
/// getFlattenedOperandNumber - Flatten a operand/suboperand pair into a
/// flat machineinstr operand #.
unsigned getFlattenedOperandNumber(std::pair<unsigned,unsigned> Op) const {
return OperandList[Op.first].MIOperandNo + Op.second;
}
/// getSubOperandNumber - Unflatten a operand number into an
/// operand/suboperand pair.
std::pair<unsigned,unsigned> getSubOperandNumber(unsigned Op) const {
for (unsigned i = 0; ; ++i) {
assert(i < OperandList.size() && "Invalid flat operand #");
if (OperandList[i].MIOperandNo+OperandList[i].MINumOperands > Op)
return std::make_pair(i, Op-OperandList[i].MIOperandNo);
}
}
/// isFlatOperandNotEmitted - Return true if the specified flat operand #
/// should not be emitted with the code emitter.
bool isFlatOperandNotEmitted(unsigned FlatOpNo) const {
std::pair<unsigned,unsigned> Op = getSubOperandNumber(FlatOpNo);
if (OperandList[Op.first].DoNotEncode.size() > Op.second)
return OperandList[Op.first].DoNotEncode[Op.second];
return false;
}
CodeGenInstruction(Record *R, const std::string &AsmStr);
/// getOperandNamed - Return the index of the operand with the specified
/// non-empty name. If the instruction does not have an operand with the
/// specified name, throw an exception.
unsigned getOperandNamed(const std::string &Name) const;
};
}
#endif
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