utils/TableGen/DAGISelEmitter.h

   1 //===- DAGISelEmitter.h - Generate an instruction selector ------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This tablegen backend emits a DAG instruction selector.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef DAGISEL_EMITTER_H
  15 #define DAGISEL_EMITTER_H
  16
  17 #include "TableGenBackend.h"
  18 #include "CodeGenDAGPatterns.h"
  19 #include <set>
  20
  21 namespace llvm {
  22
  23 /// DAGISelEmitter - The top-level class which coordinates construction
  24 /// and emission of the instruction selector.
  25 ///
  26 class DAGISelEmitter : public TableGenBackend {
  27   RecordKeeper &Records;
  28   CodeGenDAGPatterns CGP;
  29 public:
  30   explicit DAGISelEmitter(RecordKeeper &R) : Records(R), CGP(R) {}
  31
  32   // run - Output the isel, returning true on failure.
  33   void run(std::ostream &OS);
  34
  35
  36 private:
  37   void EmitNodeTransforms(std::ostream &OS);
  38   void EmitPredicateFunctions(std::ostream &OS);
  39
  40   void GenerateCodeForPattern(const PatternToMatch &Pattern,
  41                   std::vector<std::pair<unsigned, std::string> > &GeneratedCode,
  42                               std::set<std::string> &GeneratedDecl,
  43                               std::vector<std::string> &TargetOpcodes,
  44                               std::vector<std::string> &TargetVTs,
  45                               bool &OutputIsVariadic,
  46                               unsigned &NumInputRootOps);
  47   void EmitPatterns(std::vector<std::pair<const PatternToMatch*,
  48                   std::vector<std::pair<unsigned, std::string> > > > &Patterns,
  49                     unsigned Indent, std::ostream &OS);
  50
  51   void EmitInstructionSelector(std::ostream &OS);
  52 };
  53
  54 } // End llvm namespace
  55
  56 #endif