clang-tools 20.0.0git
CanonicalIncludes.h
Go to the documentation of this file.
1//===-- CanonicalIncludes.h - remap #include header -------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// At indexing time, we decide which file to #included for a symbol.
10// Usually this is the file with the canonical decl, but there are exceptions:
11// - private headers may have pragmas pointing to the matching public header.
12// (These are "IWYU" pragmas, named after the include-what-you-use tool).
13// - the standard library is implemented in many files, without any pragmas.
14// We have a lookup table for common standard library implementations.
15// libstdc++ puts char_traits in bits/char_traits.h, but we #include <string>.
16//
17//===----------------------------------------------------------------------===//
18
19#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_CANONICALINCLUDES_H
20#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_CANONICALINCLUDES_H
21
22#include "clang/Basic/FileEntry.h"
23#include "clang/Basic/LangOptions.h"
24#include "llvm/ADT/StringMap.h"
25#include "llvm/ADT/StringRef.h"
26
27namespace clang {
28namespace clangd {
29
30/// Maps a definition location onto an #include file, based on a set of filename
31/// rules.
32/// Only const methods (i.e. mapHeader) in this class are thread safe.
34public:
35 /// Returns the overridden verbatim spelling for files in \p Header that can
36 /// be directly included (i.e., contains quotes "" or angled brackets <>), or
37 /// "" if the spelling could not be found.
38 llvm::StringRef mapHeader(llvm::StringRef HeaderPath) const;
39
40 /// Adds mapping for system headers and some special symbols (e.g. STL symbols
41 /// in <iosfwd> need to be mapped individually). Approximately, the following
42 /// system headers are handled:
43 /// - C++ standard library e.g. bits/basic_string.h$ -> <string>
44 /// - Posix library e.g. bits/pthreadtypes.h$ -> <pthread.h>
45 /// - Compiler extensions, e.g. include/avx512bwintrin.h$ -> <immintrin.h>
46 /// The mapping is hardcoded and hand-maintained, so it might not cover all
47 /// headers.
48 void addSystemHeadersMapping(const LangOptions &Language);
49
50private:
51 /// A map from a suffix (one or components of a path) to a canonical path.
52 /// Used only for mapping standard headers.
53 const llvm::StringMap<llvm::StringRef> *StdSuffixHeaderMapping = nullptr;
54};
55} // namespace clangd
56} // namespace clang
57
58#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_CANONICALINCLUDES_H
Maps a definition location onto an #include file, based on a set of filename rules.
void addSystemHeadersMapping(const LangOptions &Language)
Adds mapping for system headers and some special symbols (e.g.
llvm::StringRef mapHeader(llvm::StringRef HeaderPath) const
Returns the overridden verbatim spelling for files in Header that can be directly included (i....
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//