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//===- ScriptLexer.h --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLD_ELF_SCRIPT_LEXER_H
#define LLD_ELF_SCRIPT_LEXER_H
#include "lld/Common/LLVM.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/MemoryBufferRef.h"
#include <vector>
namespace lld::elf {
struct Ctx;
class ScriptLexer {
protected:
struct Buffer {
// The remaining content to parse and the filename.
StringRef s, filename;
const char *begin = nullptr;
size_t lineNumber = 1;
// True if the script is opened as an absolute path under the --sysroot
// directory.
bool isUnderSysroot = false;
Buffer() = default;
Buffer(Ctx &ctx, MemoryBufferRef mb);
};
Ctx &ctx;
// The current buffer and parent buffers due to INCLUDE.
Buffer curBuf;
SmallVector<Buffer, 0> buffers;
// Used to detect INCLUDE() cycles.
llvm::DenseSet<StringRef> activeFilenames;
struct Token {
StringRef str;
explicit operator bool() const { return !str.empty(); }
operator StringRef() const { return str; }
};
// The token before the last next().
StringRef prevTok;
// Rules for what is a token are different when we are in an expression.
// curTok holds the cached return value of peek() and is invalid when the
// expression state changes.
StringRef curTok;
size_t prevTokLine = 1;
// The inExpr state when curTok is cached.
bool curTokState = false;
bool eof = false;
public:
explicit ScriptLexer(Ctx &ctx, MemoryBufferRef mb);
void setError(const Twine &msg);
void lex();
StringRef skipSpace(StringRef s);
bool atEOF();
StringRef next();
StringRef peek();
void skip();
bool consume(StringRef tok);
void expect(StringRef expect);
Token till(StringRef tok);
std::string getCurrentLocation();
MemoryBufferRef getCurrentMB();
std::vector<MemoryBufferRef> mbs;
bool inExpr = false;
private:
StringRef getLine();
size_t getColumnNumber();
};
} // namespace lld::elf
#endif
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