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//===- DFAPacketizerEmitter.h - Packetization DFA for a VLIW machine-------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This class parses the file and produces an API that can be used
// to reason about whether an instruction can be added to a packet on a VLIW
// architecture. The class internally generates a deterministic finite
// automaton (DFA) that models all possible mappings of machine instructions
// to functional units as instructions are added to a packet.
#include "llvm/ADT/DenseSet.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <map>
#include <string>
namespace llvm {
// class DFAGen: class that generates and prints out the DFA for resource
// tracking.
class DFAGen : public TableGenBackend {
std::string TargetName;
// allInsnClasses is the set of all possible resources consumed by an
// InstrStage.
DenseSet<unsigned> allInsnClasses;
RecordKeeper &Records;
DFAGen(RecordKeeper &R);
// collectAllInsnClasses: Populate allInsnClasses which is a set of units
// used in each stage.
void collectAllInsnClasses(const std::string &Name,
Record *ItinData,
unsigned &NStages,
raw_ostream &OS);
void run(raw_ostream &OS);