1 //===-- CppModuleConfiguration.cpp ----------------------------------------===//
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 #include "CppModuleConfiguration.h"
10
11 #include "ClangHost.h"
12 #include "lldb/Host/FileSystem.h"
13
14 using namespace lldb_private;
15
TrySet(llvm::StringRef path)16 bool CppModuleConfiguration::SetOncePath::TrySet(llvm::StringRef path) {
17 // Setting for the first time always works.
18 if (m_first) {
19 m_path = path.str();
20 m_valid = true;
21 m_first = false;
22 return true;
23 }
24 // Changing the path to the same value is fine.
25 if (m_path == path)
26 return true;
27
28 // Changing the path after it was already set is not allowed.
29 m_valid = false;
30 return false;
31 }
32
analyzeFile(const FileSpec & f)33 bool CppModuleConfiguration::analyzeFile(const FileSpec &f) {
34 using namespace llvm::sys::path;
35 // Convert to slashes to make following operations simpler.
36 std::string dir_buffer = convert_to_slash(f.GetDirectory().GetStringRef());
37 llvm::StringRef posix_dir(dir_buffer);
38
39 // Check for /c++/vX/ that is used by libc++.
40 static llvm::Regex libcpp_regex(R"regex(/c[+][+]/v[0-9]/)regex");
41 if (libcpp_regex.match(f.GetPath())) {
42 // Strip away libc++'s /experimental directory if there is one.
43 posix_dir.consume_back("/experimental");
44 return m_std_inc.TrySet(posix_dir);
45 }
46
47 // Check for /usr/include. On Linux this might be /usr/include/bits, so
48 // we should remove that '/bits' suffix to get the actual include directory.
49 if (posix_dir.endswith("/usr/include/bits"))
50 posix_dir.consume_back("/bits");
51 if (posix_dir.endswith("/usr/include"))
52 return m_c_inc.TrySet(posix_dir);
53
54 // File wasn't interesting, continue analyzing.
55 return true;
56 }
57
hasValidConfig()58 bool CppModuleConfiguration::hasValidConfig() {
59 // We all these include directories to have a valid usable configuration.
60 return m_c_inc.Valid() && m_std_inc.Valid();
61 }
62
CppModuleConfiguration(const FileSpecList & support_files)63 CppModuleConfiguration::CppModuleConfiguration(
64 const FileSpecList &support_files) {
65 // Analyze all files we were given to build the configuration.
66 bool error = !llvm::all_of(support_files,
67 std::bind(&CppModuleConfiguration::analyzeFile,
68 this, std::placeholders::_1));
69 // If we have a valid configuration at this point, set the
70 // include directories and module list that should be used.
71 if (!error && hasValidConfig()) {
72 // Calculate the resource directory for LLDB.
73 llvm::SmallString<256> resource_dir;
74 llvm::sys::path::append(resource_dir, GetClangResourceDir().GetPath(),
75 "include");
76 m_resource_inc = std::string(resource_dir.str());
77
78 // This order matches the way Clang orders these directories.
79 m_include_dirs = {m_std_inc.Get(), m_resource_inc, m_c_inc.Get()};
80 m_imported_modules = {"std"};
81 }
82 }
83