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