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annotate utils/TableGen/TableGenBackends.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children 3a76565eade5
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1 //===- TableGenBackends.h - Declarations for LLVM TableGen Backends -------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains the declarations for all of the LLVM TableGen
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11 // backends. A "TableGen backend" is just a function. See below for a
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12 // precise description.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef LLVM_UTILS_TABLEGEN_TABLEGENBACKENDS_H
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17 #define LLVM_UTILS_TABLEGEN_TABLEGENBACKENDS_H
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18
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19 // A TableGen backend is a function that looks like
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20 //
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21 // EmitFoo(RecordKeeper &RK, raw_ostream &OS /*, anything else you need */ )
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22 //
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23 // What you do inside of that function is up to you, but it will usually
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24 // involve generating C++ code to the provided raw_ostream.
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25 //
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26 // The RecordKeeper is just a top-level container for an in-memory
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27 // representation of the data encoded in the TableGen file. What a TableGen
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28 // backend does is walk around that in-memory representation and generate
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29 // stuff based on the information it contains.
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30 //
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31 // The in-memory representation is a node-graph (think of it like JSON but
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32 // with a richer ontology of types), where the nodes are subclasses of
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33 // Record. The methods `getClass`, `getDef` are the basic interface to
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34 // access the node-graph. RecordKeeper also provides a handy method
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35 // `getAllDerivedDefinitions`. Consult "include/llvm/TableGen/Record.h" for
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36 // the exact interfaces provided by Record's and RecordKeeper.
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37 //
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38 // A common pattern for TableGen backends is for the EmitFoo function to
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39 // instantiate a class which holds some context for the generation process,
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40 // and then have most of the work happen in that class's methods. This
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41 // pattern partly has historical roots in the previous TableGen backend API
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42 // that involved a class and an invocation like `FooEmitter(RK).run(OS)`.
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43 //
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44 // Remember to wrap private things in an anonymous namespace. For most
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45 // backends, this means that the EmitFoo function is the only thing not in
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46 // the anonymous namespace.
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47
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48
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49 // FIXME: Reorganize TableGen so that build dependencies can be more
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50 // accurately expressed. Currently, touching any of the emitters (or
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51 // anything that they transitively depend on) causes everything dependent
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52 // on TableGen to be rebuilt (this includes all the targets!). Perhaps have
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53 // a standalone TableGen binary and have the backends be loadable modules
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54 // of some sort; then the dependency could be expressed as being on the
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55 // module, and all the modules would have a common dependency on the
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56 // TableGen binary with as few dependencies as possible on the rest of
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57 // LLVM.
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58
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59
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60 namespace llvm {
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61
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62 class raw_ostream;
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63 class RecordKeeper;
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64
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65 void EmitIntrinsics(RecordKeeper &RK, raw_ostream &OS, bool TargetOnly = false);
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66 void EmitAsmMatcher(RecordKeeper &RK, raw_ostream &OS);
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67 void EmitAsmWriter(RecordKeeper &RK, raw_ostream &OS);
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68 void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS);
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69 void EmitCodeEmitter(RecordKeeper &RK, raw_ostream &OS);
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70 void EmitDAGISel(RecordKeeper &RK, raw_ostream &OS);
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71 void EmitDFAPacketizer(RecordKeeper &RK, raw_ostream &OS);
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72 void EmitDisassembler(RecordKeeper &RK, raw_ostream &OS);
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73 void EmitFastISel(RecordKeeper &RK, raw_ostream &OS);
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74 void EmitInstrInfo(RecordKeeper &RK, raw_ostream &OS);
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75 void EmitPseudoLowering(RecordKeeper &RK, raw_ostream &OS);
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76 void EmitRegisterInfo(RecordKeeper &RK, raw_ostream &OS);
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77 void EmitSubtarget(RecordKeeper &RK, raw_ostream &OS);
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78 void EmitMapTable(RecordKeeper &RK, raw_ostream &OS);
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79 void EmitOptParser(RecordKeeper &RK, raw_ostream &OS);
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80 void EmitCTags(RecordKeeper &RK, raw_ostream &OS);
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81 void EmitAttributes(RecordKeeper &RK, raw_ostream &OS);
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82 void EmitSearchableTables(RecordKeeper &RK, raw_ostream &OS);
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83 void EmitGlobalISel(RecordKeeper &RK, raw_ostream &OS);
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84 void EmitX86EVEX2VEXTables(RecordKeeper &RK, raw_ostream &OS);
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85 void EmitX86FoldTables(RecordKeeper &RK, raw_ostream &OS);
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86 void EmitRegisterBank(RecordKeeper &RK, raw_ostream &OS);
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87
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88 } // End llvm namespace
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90 #endif