mirror of
https://github.com/c64scene-ar/llvm-6502.git
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f460165a4c
This makes the parser much easier to understand, eliminates a ton of global variables, and gives tblgen nice caret diagnostics. It is also faster, but tblgen probably doesn't care about performance. There are a couple of FIXMEs which I will take care of next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44274 91177308-0d34-0410-b5e6-96231b3b80d8
133 lines
3.5 KiB
C++
133 lines
3.5 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 was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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 <vector>
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#include <string>
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#include <iosfwd>
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namespace llvm {
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class MemoryBuffer;
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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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// Keywords.
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Bit, Bits, Class, Code, Dag, Def, Defm, Field, In, Int, Let, List,
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MultiClass, String,
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// !keywords.
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XConcat, XSRA, XSRL, XSHL, XStrConcat,
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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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const char *CurPtr;
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unsigned CurLineNo;
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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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int CurIntVal; // This is valid for INTVAL.
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/// IncludeRec / IncludeStack - This captures the current set of include
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/// directives we are nested within.
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struct IncludeRec {
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MemoryBuffer *Buffer;
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const char *CurPtr;
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unsigned LineNo;
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IncludeRec(MemoryBuffer *buffer, const char *curPtr, unsigned lineNo)
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: Buffer(buffer), CurPtr(curPtr), LineNo(lineNo) {}
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};
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std::vector<IncludeRec> IncludeStack;
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// IncludeDirectories - This is the list of directories we should search for
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// include files in.
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std::vector<std::string> IncludeDirectories;
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public:
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TGLexer(MemoryBuffer *StartBuf);
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~TGLexer();
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void setIncludeDirs(const std::vector<std::string> &Dirs) {
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IncludeDirectories = Dirs;
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}
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tgtok::TokKind Lex() {
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return CurCode = LexToken();
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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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int 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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typedef const char* LocTy;
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LocTy getLoc() const { return TokStart; }
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void PrintError(LocTy Loc, const std::string &Msg) const;
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void PrintIncludeStack(std::ostream &OS) 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 std::string &Msg);
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int getNextChar();
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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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