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1 //===- TGParser.h - Parser for TableGen Files -------------------*- 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 class represents the Parser for tablegen files.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TABLEGEN_TGPARSER_H
15 #define LLVM_LIB_TABLEGEN_TGPARSER_H
16 
17 #include "TGLexer.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/Support/SourceMgr.h"
20 #include "llvm/TableGen/Error.h"
21 #include "llvm/TableGen/Record.h"
22 #include <map>
23 
24 namespace llvm {
25   class Record;
26   class RecordVal;
27   class RecordKeeper;
28   class RecTy;
29   class Init;
30   struct MultiClass;
31   struct SubClassReference;
32   struct SubMultiClassReference;
33 
34   struct LetRecord {
35     std::string Name;
36     std::vector<unsigned> Bits;
37     Init *Value;
38     SMLoc Loc;
LetRecordLetRecord39     LetRecord(const std::string &N, const std::vector<unsigned> &B, Init *V,
40               SMLoc L)
41       : Name(N), Bits(B), Value(V), Loc(L) {
42     }
43   };
44 
45   /// ForeachLoop - Record the iteration state associated with a for loop.
46   /// This is used to instantiate items in the loop body.
47   struct ForeachLoop {
48     VarInit *IterVar;
49     ListInit *ListValue;
50 
ForeachLoopForeachLoop51     ForeachLoop(VarInit *IVar, ListInit *LValue)
52       : IterVar(IVar), ListValue(LValue) {}
53   };
54 
55 class TGParser {
56   TGLexer Lex;
57   std::vector<std::vector<LetRecord> > LetStack;
58   std::map<std::string, std::unique_ptr<MultiClass>> MultiClasses;
59 
60   /// Loops - Keep track of any foreach loops we are within.
61   ///
62   typedef std::vector<ForeachLoop> LoopVector;
63   LoopVector Loops;
64 
65   /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the
66   /// current value.
67   MultiClass *CurMultiClass;
68 
69   // Record tracker
70   RecordKeeper &Records;
71 
72   unsigned AnonCounter;
73 
74   // A "named boolean" indicating how to parse identifiers.  Usually
75   // identifiers map to some existing object but in special cases
76   // (e.g. parsing def names) no such object exists yet because we are
77   // in the middle of creating in.  For those situations, allow the
78   // parser to ignore missing object errors.
79   enum IDParseMode {
80     ParseValueMode,   // We are parsing a value we expect to look up.
81     ParseNameMode,    // We are parsing a name of an object that does not yet
82                       // exist.
83     ParseForeachMode  // We are parsing a foreach init.
84   };
85 
86 public:
TGParser(SourceMgr & SrcMgr,RecordKeeper & records)87   TGParser(SourceMgr &SrcMgr, RecordKeeper &records)
88       : Lex(SrcMgr), CurMultiClass(nullptr), Records(records), AnonCounter(0) {}
89 
90   /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
91   /// routines return true on error, or false on success.
92   bool ParseFile();
93 
Error(SMLoc L,const Twine & Msg)94   bool Error(SMLoc L, const Twine &Msg) const {
95     PrintError(L, Msg);
96     return true;
97   }
TokError(const Twine & Msg)98   bool TokError(const Twine &Msg) const {
99     return Error(Lex.getLoc(), Msg);
100   }
getDependencies()101   const TGLexer::DependenciesMapTy &getDependencies() const {
102     return Lex.getDependencies();
103   }
104 
105 private:  // Semantic analysis methods.
106   bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV);
107   bool SetValue(Record *TheRec, SMLoc Loc, Init *ValName,
108                 ArrayRef<unsigned> BitList, Init *V,
109                 bool AllowSelfAssignment = false);
110   bool SetValue(Record *TheRec, SMLoc Loc, const std::string &ValName,
111                 ArrayRef<unsigned> BitList, Init *V,
112                 bool AllowSelfAssignment = false) {
113     return SetValue(TheRec, Loc, StringInit::get(ValName), BitList, V,
114                     AllowSelfAssignment);
115   }
116   bool AddSubClass(Record *Rec, SubClassReference &SubClass);
117   bool AddSubMultiClass(MultiClass *CurMC,
118                         SubMultiClassReference &SubMultiClass);
119 
120   std::string GetNewAnonymousName();
121 
122   // IterRecord: Map an iterator name to a value.
123   struct IterRecord {
124     VarInit *IterVar;
125     Init *IterValue;
IterRecordIterRecord126     IterRecord(VarInit *Var, Init *Val) : IterVar(Var), IterValue(Val) {}
127   };
128 
129   // IterSet: The set of all iterator values at some point in the
130   // iteration space.
131   typedef std::vector<IterRecord> IterSet;
132 
133   bool ProcessForeachDefs(Record *CurRec, SMLoc Loc);
134   bool ProcessForeachDefs(Record *CurRec, SMLoc Loc, IterSet &IterVals);
135 
136 private:  // Parser methods.
137   bool ParseObjectList(MultiClass *MC = nullptr);
138   bool ParseObject(MultiClass *MC);
139   bool ParseClass();
140   bool ParseMultiClass();
141   Record *InstantiateMulticlassDef(MultiClass &MC, Record *DefProto,
142                                    Init *&DefmPrefix, SMRange DefmPrefixRange,
143                                    ArrayRef<Init *> TArgs,
144                                    std::vector<Init *> &TemplateVals);
145   bool ResolveMulticlassDefArgs(MultiClass &MC, Record *DefProto,
146                                 SMLoc DefmPrefixLoc, SMLoc SubClassLoc,
147                                 ArrayRef<Init *> TArgs,
148                                 std::vector<Init *> &TemplateVals,
149                                 bool DeleteArgs);
150   bool ResolveMulticlassDef(MultiClass &MC,
151                             Record *CurRec,
152                             Record *DefProto,
153                             SMLoc DefmPrefixLoc);
154   bool ParseDefm(MultiClass *CurMultiClass);
155   bool ParseDef(MultiClass *CurMultiClass);
156   bool ParseForeach(MultiClass *CurMultiClass);
157   bool ParseTopLevelLet(MultiClass *CurMultiClass);
158   std::vector<LetRecord> ParseLetList();
159 
160   bool ParseObjectBody(Record *CurRec);
161   bool ParseBody(Record *CurRec);
162   bool ParseBodyItem(Record *CurRec);
163 
164   bool ParseTemplateArgList(Record *CurRec);
165   Init *ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs);
166   VarInit *ParseForeachDeclaration(ListInit *&ForeachListValue);
167 
168   SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm);
169   SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC);
170 
171   Init *ParseIDValue(Record *CurRec, const std::string &Name, SMLoc NameLoc,
172                      IDParseMode Mode = ParseValueMode);
173   Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = nullptr,
174                          IDParseMode Mode = ParseValueMode);
175   Init *ParseValue(Record *CurRec, RecTy *ItemType = nullptr,
176                    IDParseMode Mode = ParseValueMode);
177   std::vector<Init*> ParseValueList(Record *CurRec, Record *ArgsRec = nullptr,
178                                     RecTy *EltTy = nullptr);
179   std::vector<std::pair<llvm::Init*, std::string> > ParseDagArgList(Record *);
180   bool ParseOptionalRangeList(std::vector<unsigned> &Ranges);
181   bool ParseOptionalBitList(std::vector<unsigned> &Ranges);
182   std::vector<unsigned> ParseRangeList();
183   bool ParseRangePiece(std::vector<unsigned> &Ranges);
184   RecTy *ParseType();
185   Init *ParseOperation(Record *CurRec, RecTy *ItemType);
186   RecTy *ParseOperatorType();
187   Init *ParseObjectName(MultiClass *CurMultiClass);
188   Record *ParseClassID();
189   MultiClass *ParseMultiClassID();
190   bool ApplyLetStack(Record *CurRec);
191 };
192 
193 } // end namespace llvm
194 
195 #endif
196