731a66ae98
The linker script lexer is context-sensitive. In the regular context, arithmetic operator characters are regular characters, but in the expression context, they are independent tokens. This afects how the lexer tokenizes "3*4", for example. (This kind of expression is real; the Linux kernel uses it.) This patch defines function `maybeSplitExpr`. This function splits the current token into multiple expression tokens if the lexer is in the expression context. Differential Revision: https://reviews.llvm.org/D29963 llvm-svn: 295225
56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
//===- ScriptLexer.h --------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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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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#ifndef LLD_ELF_SCRIPT_LEXER_H
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#define LLD_ELF_SCRIPT_LEXER_H
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#include "lld/Core/LLVM.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <utility>
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#include <vector>
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namespace lld {
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namespace elf {
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class ScriptLexer {
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public:
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explicit ScriptLexer(MemoryBufferRef MB);
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void setError(const Twine &Msg);
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void tokenize(MemoryBufferRef MB);
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static StringRef skipSpace(StringRef S);
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bool atEOF();
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StringRef next();
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StringRef peek(unsigned N = 0);
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void skip();
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bool consume(StringRef Tok);
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void expect(StringRef Expect);
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std::string getCurrentLocation();
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std::vector<MemoryBufferRef> MBs;
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std::vector<StringRef> Tokens;
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bool InExpr = false;
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size_t Pos = 0;
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bool Error = false;
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private:
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void maybeSplitExpr();
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StringRef getLine();
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size_t getLineNumber();
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size_t getColumnNumber();
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MemoryBufferRef getCurrentMB();
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};
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} // namespace elf
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} // namespace lld
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#endif
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