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| //===-- CPlusPlusNameParser.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 liblldb_CPlusPlusNameParser_h_
#define liblldb_CPlusPlusNameParser_h_
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/lldb-private.h"
namespace lldb_private {
// Helps to validate and obtain various parts of C++ definitions.
class CPlusPlusNameParser {
public:
CPlusPlusNameParser(llvm::StringRef text) : m_text(text) { ExtractTokens(); }
struct ParsedName {
llvm::StringRef basename;
llvm::StringRef context;
};
struct ParsedFunction {
ParsedName name;
llvm::StringRef arguments;
llvm::StringRef qualifiers;
};
// Treats given text as a function definition and parses it.
// Function definition might or might not have a return type and this should
// change parsing result.
// Examples:
// main(int, chat const*)
// T fun(int, bool)
// std::vector<int>::push_back(int)
// int& map<int, pair<short, int>>::operator[](short) const
// int (*get_function(const chat *))()
llvm::Optional<ParsedFunction> ParseAsFunctionDefinition();
// Treats given text as a potentially nested name of C++ entity (function,
// class, field) and parses it.
// Examples:
// main
// fun
// std::vector<int>::push_back
// map<int, pair<short, int>>::operator[]
// func<C>(int, C&)::nested_class::method
llvm::Optional<ParsedName> ParseAsFullName();
private:
// A C++ definition to parse.
llvm::StringRef m_text;
// Tokens extracted from m_text.
llvm::SmallVector<clang::Token, 30> m_tokens;
// Index of the next token to look at from m_tokens.
size_t m_next_token_index = 0;
// Range of tokens saved in m_next_token_index.
struct Range {
size_t begin_index = 0;
size_t end_index = 0;
Range() {}
Range(size_t begin, size_t end) : begin_index(begin), end_index(end) {
assert(end >= begin);
}
size_t size() const { return end_index - begin_index; }
bool empty() const { return size() == 0; }
};
struct ParsedNameRanges {
Range basename_range;
Range context_range;
};
// Bookmark automatically restores parsing position (m_next_token_index)
// when destructed unless it's manually removed with Remove().
class Bookmark {
public:
Bookmark(size_t &position)
: m_position(position), m_position_value(position) {}
Bookmark(const Bookmark &) = delete;
Bookmark(Bookmark &&b)
: m_position(b.m_position), m_position_value(b.m_position_value),
m_restore(b.m_restore) {
b.Remove();
}
Bookmark &operator=(Bookmark &&) = delete;
Bookmark &operator=(const Bookmark &) = delete;
void Remove() { m_restore = false; }
size_t GetSavedPosition() { return m_position_value; }
~Bookmark() {
if (m_restore) {
m_position = m_position_value;
}
}
private:
size_t &m_position;
size_t m_position_value;
bool m_restore = true;
};
bool HasMoreTokens();
void Advance();
void TakeBack();
bool ConsumeToken(clang::tok::TokenKind kind);
template <typename... Ts> bool ConsumeToken(Ts... kinds);
Bookmark SetBookmark();
size_t GetCurrentPosition();
clang::Token &Peek();
bool ConsumeBrackets(clang::tok::TokenKind left, clang::tok::TokenKind right);
llvm::Optional<ParsedFunction> ParseFunctionImpl(bool expect_return_type);
// Parses functions returning function pointers 'string (*f(int x))(float y)'
llvm::Optional<ParsedFunction> ParseFuncPtr(bool expect_return_type);
// Consumes function arguments enclosed within '(' ... ')'
bool ConsumeArguments();
// Consumes template arguments enclosed within '<' ... '>'
bool ConsumeTemplateArgs();
// Consumes '(anonymous namespace)'
bool ConsumeAnonymousNamespace();
// Consumes '{lambda ...}'
bool ConsumeLambda();
// Consumes operator declaration like 'operator *' or 'operator delete []'
bool ConsumeOperator();
// Skips 'const' and 'volatile'
void SkipTypeQualifiers();
// Skips 'const', 'volatile', '&', '&&' in the end of the function.
void SkipFunctionQualifiers();
// Consumes built-in types like 'int' or 'unsigned long long int'
bool ConsumeBuiltinType();
// Consumes types defined via decltype keyword.
bool ConsumeDecltype();
// Skips 'const' and 'volatile'
void SkipPtrsAndRefs();
// Consumes things like 'const * const &'
bool ConsumePtrsAndRefs();
// Consumes full type name like 'Namespace::Class<int>::Method()::InnerClass'
bool ConsumeTypename();
llvm::Optional<ParsedNameRanges> ParseFullNameImpl();
llvm::StringRef GetTextForRange(const Range &range);
// Populate m_tokens by calling clang lexer on m_text.
void ExtractTokens();
};
} // namespace lldb_private
#endif // liblldb_CPlusPlusNameParser_h_
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