xref: /openbsd-src/gnu/llvm/lldb/source/Plugins/ExpressionParser/Clang/CppModuleConfiguration.cpp (revision 061da546b983eb767bad15e67af1174fb0bcf31c)
1*061da546Spatrick //===-- CppModuleConfiguration.cpp ----------------------------------------===//
2*061da546Spatrick //
3*061da546Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*061da546Spatrick // See https://llvm.org/LICENSE.txt for license information.
5*061da546Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*061da546Spatrick //
7*061da546Spatrick //===----------------------------------------------------------------------===//
8*061da546Spatrick 
9*061da546Spatrick #include "CppModuleConfiguration.h"
10*061da546Spatrick 
11*061da546Spatrick #include "ClangHost.h"
12*061da546Spatrick #include "lldb/Host/FileSystem.h"
13*061da546Spatrick 
14*061da546Spatrick using namespace lldb_private;
15*061da546Spatrick 
16*061da546Spatrick bool CppModuleConfiguration::SetOncePath::TrySet(llvm::StringRef path) {
17*061da546Spatrick   // Setting for the first time always works.
18*061da546Spatrick   if (m_first) {
19*061da546Spatrick     m_path = path.str();
20*061da546Spatrick     m_valid = true;
21*061da546Spatrick     m_first = false;
22*061da546Spatrick     return true;
23*061da546Spatrick   }
24*061da546Spatrick   // Changing the path to the same value is fine.
25*061da546Spatrick   if (m_path == path)
26*061da546Spatrick     return true;
27*061da546Spatrick 
28*061da546Spatrick   // Changing the path after it was already set is not allowed.
29*061da546Spatrick   m_valid = false;
30*061da546Spatrick   return false;
31*061da546Spatrick }
32*061da546Spatrick 
33*061da546Spatrick bool CppModuleConfiguration::analyzeFile(const FileSpec &f) {
34*061da546Spatrick   using namespace llvm::sys::path;
35*061da546Spatrick   // Convert to slashes to make following operations simpler.
36*061da546Spatrick   std::string dir_buffer = convert_to_slash(f.GetDirectory().GetStringRef());
37*061da546Spatrick   llvm::StringRef posix_dir(dir_buffer);
38*061da546Spatrick 
39*061da546Spatrick   // Check for /c++/vX/ that is used by libc++.
40*061da546Spatrick   static llvm::Regex libcpp_regex(R"regex(/c[+][+]/v[0-9]/)regex");
41*061da546Spatrick   if (libcpp_regex.match(f.GetPath())) {
42*061da546Spatrick     // Strip away libc++'s /experimental directory if there is one.
43*061da546Spatrick     posix_dir.consume_back("/experimental");
44*061da546Spatrick     return m_std_inc.TrySet(posix_dir);
45*061da546Spatrick   }
46*061da546Spatrick 
47*061da546Spatrick   // Check for /usr/include. On Linux this might be /usr/include/bits, so
48*061da546Spatrick   // we should remove that '/bits' suffix to get the actual include directory.
49*061da546Spatrick   if (posix_dir.endswith("/usr/include/bits"))
50*061da546Spatrick     posix_dir.consume_back("/bits");
51*061da546Spatrick   if (posix_dir.endswith("/usr/include"))
52*061da546Spatrick     return m_c_inc.TrySet(posix_dir);
53*061da546Spatrick 
54*061da546Spatrick   // File wasn't interesting, continue analyzing.
55*061da546Spatrick   return true;
56*061da546Spatrick }
57*061da546Spatrick 
58*061da546Spatrick bool CppModuleConfiguration::hasValidConfig() {
59*061da546Spatrick   // We all these include directories to have a valid usable configuration.
60*061da546Spatrick   return m_c_inc.Valid() && m_std_inc.Valid();
61*061da546Spatrick }
62*061da546Spatrick 
63*061da546Spatrick CppModuleConfiguration::CppModuleConfiguration(
64*061da546Spatrick     const FileSpecList &support_files) {
65*061da546Spatrick   // Analyze all files we were given to build the configuration.
66*061da546Spatrick   bool error = !llvm::all_of(support_files,
67*061da546Spatrick                              std::bind(&CppModuleConfiguration::analyzeFile,
68*061da546Spatrick                                        this, std::placeholders::_1));
69*061da546Spatrick   // If we have a valid configuration at this point, set the
70*061da546Spatrick   // include directories and module list that should be used.
71*061da546Spatrick   if (!error && hasValidConfig()) {
72*061da546Spatrick     // Calculate the resource directory for LLDB.
73*061da546Spatrick     llvm::SmallString<256> resource_dir;
74*061da546Spatrick     llvm::sys::path::append(resource_dir, GetClangResourceDir().GetPath(),
75*061da546Spatrick                             "include");
76*061da546Spatrick     m_resource_inc = resource_dir.str();
77*061da546Spatrick 
78*061da546Spatrick     // This order matches the way Clang orders these directories.
79*061da546Spatrick     m_include_dirs = {m_std_inc.Get(), m_resource_inc, m_c_inc.Get()};
80*061da546Spatrick     m_imported_modules = {"std"};
81*061da546Spatrick   }
82*061da546Spatrick }
83