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//===- PseudoLoweringEmitter.h - PseudoLowering Generator -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef PSEUDOLOWERINGEMITTER_H
#define PSEUDOLOWERINGEMITTER_H
#include "CodeGenInstruction.h"
#include "CodeGenTarget.h"
#include "llvm/TableGen/TableGenBackend.h"
#include "llvm/ADT/IndexedMap.h"
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class PseudoLoweringEmitter : public TableGenBackend {
struct OpData {
enum MapKind { Operand, Imm, Reg };
MapKind Kind;
union {
unsigned Operand; // Operand number mapped to.
uint64_t Imm; // Integer immedate value.
Record *Reg; // Physical register.
} Data;
};
struct PseudoExpansion {
CodeGenInstruction Source; // The source pseudo instruction definition.
CodeGenInstruction Dest; // The destination instruction to lower to.
IndexedMap<OpData> OperandMap;
PseudoExpansion(CodeGenInstruction &s, CodeGenInstruction &d,
IndexedMap<OpData> &m) :
Source(s), Dest(d), OperandMap(m) {}
};
RecordKeeper &Records;
// It's overkill to have an instance of the full CodeGenTarget object,
// but it loads everything on demand, not in the constructor, so it's
// lightweight in performance, so it works out OK.
CodeGenTarget Target;
SmallVector<PseudoExpansion, 64> Expansions;
unsigned addDagOperandMapping(Record *Rec, DagInit *Dag,
CodeGenInstruction &Insn,
IndexedMap<OpData> &OperandMap,
unsigned BaseIdx);
void evaluateExpansion(Record *Pseudo);
void emitLoweringEmitter(raw_ostream &o);
public:
PseudoLoweringEmitter(RecordKeeper &R) : Records(R), Target(R) {}
/// run - Output the pseudo-lowerings.
void run(raw_ostream &o);
};
} // end llvm namespace
#endif
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