327 lines
11 KiB
C++
327 lines
11 KiB
C++
//===- CodeGenInstruction.h - Instruction Class Wrapper ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a wrapper class for the 'Instruction' TableGen class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CODEGEN_INSTRUCTION_H
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#define CODEGEN_INSTRUCTION_H
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/SourceMgr.h"
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#include <string>
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#include <vector>
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#include <utility>
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namespace llvm {
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class Record;
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class DagInit;
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class CodeGenTarget;
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class StringRef;
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class CGIOperandList {
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public:
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class ConstraintInfo {
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enum { None, EarlyClobber, Tied } Kind;
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unsigned OtherTiedOperand;
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public:
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ConstraintInfo() : Kind(None) {}
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static ConstraintInfo getEarlyClobber() {
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ConstraintInfo I;
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I.Kind = EarlyClobber;
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I.OtherTiedOperand = 0;
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return I;
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}
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static ConstraintInfo getTied(unsigned Op) {
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ConstraintInfo I;
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I.Kind = Tied;
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I.OtherTiedOperand = Op;
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return I;
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}
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bool isNone() const { return Kind == None; }
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bool isEarlyClobber() const { return Kind == EarlyClobber; }
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bool isTied() const { return Kind == Tied; }
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unsigned getTiedOperand() const {
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assert(isTied());
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return OtherTiedOperand;
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}
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};
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/// OperandInfo - The information we keep track of for each operand in the
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/// operand list for a tablegen instruction.
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struct OperandInfo {
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/// Rec - The definition this operand is declared as.
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///
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Record *Rec;
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/// Name - If this operand was assigned a symbolic name, this is it,
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/// otherwise, it's empty.
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std::string Name;
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/// PrinterMethodName - The method used to print operands of this type in
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/// the asmprinter.
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std::string PrinterMethodName;
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/// EncoderMethodName - The method used to get the machine operand value
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/// for binary encoding. "getMachineOpValue" by default.
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std::string EncoderMethodName;
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/// OperandType - A value from MCOI::OperandType representing the type of
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/// the operand.
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std::string OperandType;
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/// MIOperandNo - Currently (this is meant to be phased out), some logical
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/// operands correspond to multiple MachineInstr operands. In the X86
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/// target for example, one address operand is represented as 4
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/// MachineOperands. Because of this, the operand number in the
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/// OperandList may not match the MachineInstr operand num. Until it
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/// does, this contains the MI operand index of this operand.
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unsigned MIOperandNo;
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unsigned MINumOperands; // The number of operands.
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/// DoNotEncode - Bools are set to true in this vector for each operand in
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/// the DisableEncoding list. These should not be emitted by the code
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/// emitter.
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std::vector<bool> DoNotEncode;
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/// MIOperandInfo - Default MI operand type. Note an operand may be made
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/// up of multiple MI operands.
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DagInit *MIOperandInfo;
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/// Constraint info for this operand. This operand can have pieces, so we
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/// track constraint info for each.
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std::vector<ConstraintInfo> Constraints;
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OperandInfo(Record *R, const std::string &N, const std::string &PMN,
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const std::string &EMN, const std::string &OT, unsigned MION,
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unsigned MINO, DagInit *MIOI)
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: Rec(R), Name(N), PrinterMethodName(PMN), EncoderMethodName(EMN),
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OperandType(OT), MIOperandNo(MION), MINumOperands(MINO),
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MIOperandInfo(MIOI) {}
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/// getTiedOperand - If this operand is tied to another one, return the
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/// other operand number. Otherwise, return -1.
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int getTiedRegister() const {
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for (unsigned j = 0, e = Constraints.size(); j != e; ++j) {
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const CGIOperandList::ConstraintInfo &CI = Constraints[j];
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if (CI.isTied()) return CI.getTiedOperand();
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}
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return -1;
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}
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};
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CGIOperandList(Record *D);
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Record *TheDef; // The actual record containing this OperandList.
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/// NumDefs - Number of def operands declared, this is the number of
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/// elements in the instruction's (outs) list.
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///
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unsigned NumDefs;
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/// OperandList - The list of declared operands, along with their declared
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/// type (which is a record).
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std::vector<OperandInfo> OperandList;
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// Information gleaned from the operand list.
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bool isPredicable;
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bool hasOptionalDef;
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bool isVariadic;
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// Provide transparent accessors to the operand list.
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bool empty() const { return OperandList.empty(); }
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unsigned size() const { return OperandList.size(); }
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const OperandInfo &operator[](unsigned i) const { return OperandList[i]; }
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OperandInfo &operator[](unsigned i) { return OperandList[i]; }
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OperandInfo &back() { return OperandList.back(); }
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const OperandInfo &back() const { return OperandList.back(); }
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/// getOperandNamed - Return the index of the operand with the specified
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/// non-empty name. If the instruction does not have an operand with the
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/// specified name, throw an exception.
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unsigned getOperandNamed(StringRef Name) const;
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/// hasOperandNamed - Query whether the instruction has an operand of the
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/// given name. If so, return true and set OpIdx to the index of the
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/// operand. Otherwise, return false.
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bool hasOperandNamed(StringRef Name, unsigned &OpIdx) const;
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/// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
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/// where $foo is a whole operand and $foo.bar refers to a suboperand.
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/// This throws an exception if the name is invalid. If AllowWholeOp is
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/// true, references to operands with suboperands are allowed, otherwise
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/// not.
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std::pair<unsigned,unsigned> ParseOperandName(const std::string &Op,
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bool AllowWholeOp = true);
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/// getFlattenedOperandNumber - Flatten a operand/suboperand pair into a
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/// flat machineinstr operand #.
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unsigned getFlattenedOperandNumber(std::pair<unsigned,unsigned> Op) const {
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return OperandList[Op.first].MIOperandNo + Op.second;
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}
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/// getSubOperandNumber - Unflatten a operand number into an
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/// operand/suboperand pair.
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std::pair<unsigned,unsigned> getSubOperandNumber(unsigned Op) const {
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for (unsigned i = 0; ; ++i) {
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assert(i < OperandList.size() && "Invalid flat operand #");
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if (OperandList[i].MIOperandNo+OperandList[i].MINumOperands > Op)
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return std::make_pair(i, Op-OperandList[i].MIOperandNo);
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}
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}
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/// isFlatOperandNotEmitted - Return true if the specified flat operand #
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/// should not be emitted with the code emitter.
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bool isFlatOperandNotEmitted(unsigned FlatOpNo) const {
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std::pair<unsigned,unsigned> Op = getSubOperandNumber(FlatOpNo);
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if (OperandList[Op.first].DoNotEncode.size() > Op.second)
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return OperandList[Op.first].DoNotEncode[Op.second];
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return false;
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}
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void ProcessDisableEncoding(std::string Value);
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};
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class CodeGenInstruction {
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public:
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Record *TheDef; // The actual record defining this instruction.
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std::string Namespace; // The namespace the instruction is in.
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/// AsmString - The format string used to emit a .s file for the
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/// instruction.
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std::string AsmString;
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/// Operands - This is information about the (ins) and (outs) list specified
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/// to the instruction.
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CGIOperandList Operands;
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/// ImplicitDefs/ImplicitUses - These are lists of registers that are
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/// implicitly defined and used by the instruction.
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std::vector<Record*> ImplicitDefs, ImplicitUses;
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// Various boolean values we track for the instruction.
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bool isReturn;
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bool isBranch;
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bool isIndirectBranch;
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bool isCompare;
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bool isMoveImm;
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bool isBitcast;
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bool isBarrier;
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bool isCall;
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bool canFoldAsLoad;
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bool mayLoad, mayStore;
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bool isPredicable;
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bool isConvertibleToThreeAddress;
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bool isCommutable;
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bool isTerminator;
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bool isReMaterializable;
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bool hasDelaySlot;
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bool usesCustomInserter;
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bool hasPostISelHook;
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bool hasCtrlDep;
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bool isNotDuplicable;
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bool hasSideEffects;
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bool neverHasSideEffects;
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bool isAsCheapAsAMove;
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bool hasExtraSrcRegAllocReq;
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bool hasExtraDefRegAllocReq;
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bool isCodeGenOnly;
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bool isPseudo;
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CodeGenInstruction(Record *R);
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/// HasOneImplicitDefWithKnownVT - If the instruction has at least one
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/// implicit def and it has a known VT, return the VT, otherwise return
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/// MVT::Other.
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MVT::SimpleValueType
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HasOneImplicitDefWithKnownVT(const CodeGenTarget &TargetInfo) const;
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/// FlattenAsmStringVariants - Flatten the specified AsmString to only
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/// include text from the specified variant, returning the new string.
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static std::string FlattenAsmStringVariants(StringRef AsmString,
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unsigned Variant);
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};
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/// CodeGenInstAlias - This represents an InstAlias definition.
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class CodeGenInstAlias {
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public:
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Record *TheDef; // The actual record defining this InstAlias.
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/// AsmString - The format string used to emit a .s file for the
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/// instruction.
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std::string AsmString;
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/// Result - The result instruction.
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DagInit *Result;
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/// ResultInst - The instruction generated by the alias (decoded from
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/// Result).
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CodeGenInstruction *ResultInst;
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struct ResultOperand {
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private:
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StringRef Name;
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Record *R;
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int64_t Imm;
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public:
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enum {
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K_Record,
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K_Imm,
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K_Reg
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} Kind;
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ResultOperand(StringRef N, Record *r) : Name(N), R(r), Kind(K_Record) {}
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ResultOperand(int64_t I) : Imm(I), Kind(K_Imm) {}
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ResultOperand(Record *r) : R(r), Kind(K_Reg) {}
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bool isRecord() const { return Kind == K_Record; }
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bool isImm() const { return Kind == K_Imm; }
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bool isReg() const { return Kind == K_Reg; }
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StringRef getName() const { assert(isRecord()); return Name; }
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Record *getRecord() const { assert(isRecord()); return R; }
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int64_t getImm() const { assert(isImm()); return Imm; }
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Record *getRegister() const { assert(isReg()); return R; }
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};
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/// ResultOperands - The decoded operands for the result instruction.
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std::vector<ResultOperand> ResultOperands;
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/// ResultInstOperandIndex - For each operand, this vector holds a pair of
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/// indices to identify the corresponding operand in the result
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/// instruction. The first index specifies the operand and the second
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/// index specifies the suboperand. If there are no suboperands or if all
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/// of them are matched by the operand, the second value should be -1.
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std::vector<std::pair<unsigned, int> > ResultInstOperandIndex;
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CodeGenInstAlias(Record *R, CodeGenTarget &T);
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bool tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
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Record *InstOpRec, bool hasSubOps, SMLoc Loc,
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CodeGenTarget &T, ResultOperand &ResOp);
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};
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}
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#endif
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