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6309c4fe22
A double inclusion will pretty much always be an error in TableGen, so there's no point going on just to die with "def already defined" or whatnot. I'm not too thrilled about the "public: ... private: ..." to expose the DependenciesMapTy, but I really didn't see a better way to keep that type centralized. It's a smell that indicates that some refactoring is needed to make this code more loosely coupled. This should avoid all bugs of the same nature as PR15189. llvm-svn: 174582
133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
//===- TGLexer.h - Lexer for TableGen Files ---------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class represents the Lexer for tablegen files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef TGLEXER_H
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#define TGLEXER_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/SMLoc.h"
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#include <cassert>
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#include <map>
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#include <string>
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namespace llvm {
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class MemoryBuffer;
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class SourceMgr;
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class SMLoc;
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class Twine;
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namespace tgtok {
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enum TokKind {
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// Markers
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Eof, Error,
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// Tokens with no info.
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minus, plus, // - +
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l_square, r_square, // [ ]
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l_brace, r_brace, // { }
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l_paren, r_paren, // ( )
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less, greater, // < >
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colon, semi, // : ;
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comma, period, // , .
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equal, question, // = ?
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paste, // #
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// Keywords.
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Bit, Bits, Class, Code, Dag, Def, Foreach, Defm, Field, In, Int, Let, List,
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MultiClass, String,
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// !keywords.
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XConcat, XADD, XSRA, XSRL, XSHL, XStrConcat, XCast, XSubst,
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XForEach, XHead, XTail, XEmpty, XIf, XEq,
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// Integer value.
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IntVal,
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// String valued tokens.
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Id, StrVal, VarName, CodeFragment
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};
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}
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/// TGLexer - TableGen Lexer class.
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class TGLexer {
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SourceMgr &SrcMgr;
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const char *CurPtr;
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const MemoryBuffer *CurBuf;
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// Information about the current token.
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const char *TokStart;
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tgtok::TokKind CurCode;
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std::string CurStrVal; // This is valid for ID, STRVAL, VARNAME, CODEFRAGMENT
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int64_t CurIntVal; // This is valid for INTVAL.
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/// CurBuffer - This is the current buffer index we're lexing from as managed
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/// by the SourceMgr object.
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int CurBuffer;
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public:
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typedef std::map<std::string, SMLoc> DependenciesMapTy;
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private:
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/// Dependencies - This is the list of all included files.
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DependenciesMapTy Dependencies;
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public:
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TGLexer(SourceMgr &SrcMgr);
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~TGLexer() {}
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tgtok::TokKind Lex() {
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return CurCode = LexToken();
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}
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const DependenciesMapTy &getDependencies() const {
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return Dependencies;
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}
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tgtok::TokKind getCode() const { return CurCode; }
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const std::string &getCurStrVal() const {
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assert((CurCode == tgtok::Id || CurCode == tgtok::StrVal ||
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CurCode == tgtok::VarName || CurCode == tgtok::CodeFragment) &&
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"This token doesn't have a string value");
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return CurStrVal;
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}
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int64_t getCurIntVal() const {
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assert(CurCode == tgtok::IntVal && "This token isn't an integer");
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return CurIntVal;
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}
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SMLoc getLoc() const;
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private:
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/// LexToken - Read the next token and return its code.
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tgtok::TokKind LexToken();
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tgtok::TokKind ReturnError(const char *Loc, const Twine &Msg);
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int getNextChar();
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int peekNextChar(int Index);
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void SkipBCPLComment();
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bool SkipCComment();
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tgtok::TokKind LexIdentifier();
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bool LexInclude();
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tgtok::TokKind LexString();
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tgtok::TokKind LexVarName();
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tgtok::TokKind LexNumber();
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tgtok::TokKind LexBracket();
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tgtok::TokKind LexExclaim();
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};
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} // end namespace llvm
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#endif
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