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df98617b23
and clean recursive descent parser. This change has a couple of ramifications: 1. The parser code is about 400 lines shorter (in what we maintain, not including what is autogenerated). 2. The code should be significantly faster than the old code because we don't have to work around bison's poor handling of datatypes with ctors/dtors. This also makes the code much more resistant to memory leaks. 3. We now get caret diagnostics from the .ll parser, woo. 4. The actual diagnostics emited from the parser are completely different so a bunch of testcases had to be updated. 5. I now disallow "%ty = type opaque %ty = type i32". There was no good reason to support this, it was just an accident of the old implementation. I have no reason to think that anyone is actually using this. 6. The syntax for sticking a global variable has changed to make it unambiguous. I don't think anyone is depending on this since only clang supports this and it is not solid yet, so I'm not worried about anything breaking. 7. This gets rid of the last use of bison, and along with it the .cvs files. I'll prune this from the makefiles as a subsequent commit. There are a few minor cleanups that can be done after this commit (suggestions welcome!) but this passes dejagnu testing and is ready for its time in the limelight. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61558 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
//===- LLLexer.h - Lexer for LLVM Assembly 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 .ll files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LIB_ASMPARSER_LLLEXER_H
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#define LIB_ASMPARSER_LLLEXER_H
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#include "LLToken.h"
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#include "llvm/ADT/APSInt.h"
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#include "llvm/ADT/APFloat.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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class Type;
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class ParseError;
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class LLLexer {
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const char *CurPtr;
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MemoryBuffer *CurBuf;
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ParseError &ErrorInfo;
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// Information about the current token.
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const char *TokStart;
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lltok::Kind CurKind;
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std::string StrVal;
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unsigned UIntVal;
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const Type *TyVal;
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APFloat APFloatVal;
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APSInt APSIntVal;
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std::string TheError;
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public:
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explicit LLLexer(MemoryBuffer *StartBuf, ParseError &);
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~LLLexer() {}
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lltok::Kind Lex() {
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return CurKind = LexToken();
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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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lltok::Kind getKind() const { return CurKind; }
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const std::string getStrVal() const { return StrVal; }
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const Type *getTyVal() const { return TyVal; }
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unsigned getUIntVal() const { return UIntVal; }
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const APSInt &getAPSIntVal() const { return APSIntVal; }
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const APFloat &getAPFloatVal() const { return APFloatVal; }
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bool Error(LocTy L, const std::string &Msg) const;
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bool Error(const std::string &Msg) const { return Error(CurPtr, Msg); }
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std::string getFilename() const;
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private:
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lltok::Kind LexToken();
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int getNextChar();
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void SkipLineComment();
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lltok::Kind LexIdentifier();
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lltok::Kind LexDigitOrNegative();
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lltok::Kind LexPositive();
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lltok::Kind LexAt();
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lltok::Kind LexPercent();
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lltok::Kind LexQuote();
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lltok::Kind Lex0x();
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uint64_t atoull(const char *Buffer, const char *End);
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uint64_t HexIntToVal(const char *Buffer, const char *End);
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void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
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};
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} // end namespace llvm
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#endif
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