================ @@ -0,0 +1,158 @@ +//===-- DILLexer.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 LLDB_VALUEOBJECT_DILLEXER_H_ +#define LLDB_VALUEOBJECT_DILLEXER_H_ + +#include "llvm/ADT/StringRef.h" +#include "llvm/ADT/iterator_range.h" +#include "llvm/Support/Error.h" +#include <cstdint> +#include <limits.h> +#include <memory> +#include <string> +#include <vector> + +namespace lldb_private { + +namespace dil { + +/// Class defining the tokens generated by the DIL lexer and used by the +/// DIL parser. +class Token { +public: + enum Kind { + coloncolon, + eof, + identifier, + invalid, + kw_namespace, + l_paren, + none, + r_paren, + unknown, + }; + + Token(Kind kind, std::string spelling, uint32_t start) + : m_kind(kind), m_spelling(spelling), m_start_pos(start) {} + + Token() : m_kind(Kind::none), m_spelling(""), m_start_pos(0) {} + + void SetKind(Kind kind) { m_kind = kind; } + + Kind GetKind() const { return m_kind; } + + std::string GetSpelling() const { return m_spelling; } + + uint32_t GetLength() const { return m_spelling.size(); } + + bool Is(Kind kind) const { return m_kind == kind; } + + bool IsNot(Kind kind) const { return m_kind != kind; } + + bool IsOneOf(Kind kind1, Kind kind2) const { return Is(kind1) || Is(kind2); } + + template <typename... Ts> bool IsOneOf(Kind kind, Ts... Ks) const { + return Is(kind) || IsOneOf(Ks...); + } + + uint32_t GetLocation() const { return m_start_pos; } + + static llvm::StringRef GetTokenName(Kind kind); + +private: + Kind m_kind; + std::string m_spelling; + uint32_t m_start_pos; // within entire expression string +}; + +/// Class for doing the simple lexing required by DIL. +class DILLexer { +public: + DILLexer(llvm::StringRef dil_expr) : m_expr(dil_expr) { + m_cur_pos = m_expr.begin(); + // Use UINT_MAX to indicate invalid/uninitialized value. + m_tokens_idx = UINT_MAX; + m_invalid_token = Token(Token::invalid, "", 0); + } + + llvm::Expected<bool> LexAll(); + + /// Return the lexed token N+1 positions ahead of the 'current' token + /// being handled by the DIL parser. + const Token &LookAhead(uint32_t N); + + const Token &AcceptLookAhead(uint32_t N); + + const Token &GetNextToken(); + + /// Return the index for the 'current' token being handled by the DIL parser. + uint32_t GetCurrentTokenIdx() { return m_tokens_idx; } + + /// Return the current token to be handled by the DIL parser. + const Token &GetCurrentToken() { return m_lexed_tokens[m_tokens_idx]; } + + uint32_t NumLexedTokens() { return m_lexed_tokens.size(); } + + /// Update the index for the 'current' token, to point to the next lexed + /// token. + bool IncrementTokenIdx() { + if (m_tokens_idx >= m_lexed_tokens.size() - 1) + return false; + + m_tokens_idx++; + return true; + } + + /// Set the index for the 'current' token (to be handled by the parser) + /// to a particular position. Used for either committing 'look ahead' parsing + /// or rolling back tentative parsing. + bool ResetTokenIdx(uint32_t new_value) { + if (new_value > m_lexed_tokens.size() - 1) + return false; + + m_tokens_idx = new_value; + return true; + } + + uint32_t GetLocation() { return m_cur_pos - m_expr.begin(); } ---------------- labath wrote:
should this be private? https://github.com/llvm/llvm-project/pull/123521 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
