1 //===------------ FixedLenDecoderEmitter.h - Decoder Generator --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // It contains the tablegen backend that emits the decoder functions for
11 // targets with fixed length instruction set.
13 //===----------------------------------------------------------------------===//
15 #ifndef FixedLenDECODEREMITTER_H
16 #define FixedLenDECODEREMITTER_H
18 #include "CodeGenTarget.h"
20 #include "llvm/TableGen/TableGenBackend.h"
21 #include "llvm/Support/DataTypes.h"
25 struct EncodingField {
26 unsigned Base, Width, Offset;
27 EncodingField(unsigned B, unsigned W, unsigned O)
28 : Base(B), Width(W), Offset(O) { }
32 std::vector<EncodingField> Fields;
35 OperandInfo(std::string D)
38 void addField(unsigned Base, unsigned Width, unsigned Offset) {
39 Fields.push_back(EncodingField(Base, Width, Offset));
42 unsigned numFields() const { return Fields.size(); }
44 typedef std::vector<EncodingField>::const_iterator const_iterator;
46 const_iterator begin() const { return Fields.begin(); }
47 const_iterator end() const { return Fields.end(); }
50 class FixedLenDecoderEmitter : public TableGenBackend {
52 FixedLenDecoderEmitter(RecordKeeper &R,
53 std::string PredicateNamespace,
54 std::string GPrefix = "if (",
55 std::string GPostfix = " == MCDisassembler::Fail)"
56 " return MCDisassembler::Fail;",
57 std::string ROK = "MCDisassembler::Success",
58 std::string RFail = "MCDisassembler::Fail",
61 PredicateNamespace(PredicateNamespace),
62 GuardPrefix(GPrefix), GuardPostfix(GPostfix),
63 ReturnOK(ROK), ReturnFail(RFail), Locals(L) {}
65 // run - Output the code emitter
66 void run(raw_ostream &o);
71 std::string PredicateNamespace;
72 std::string GuardPrefix, GuardPostfix;
73 std::string ReturnOK, ReturnFail;
77 } // end llvm namespace