1 //===--- GlobalCompilationDatabase.cpp --------------------------*- C++-*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===---------------------------------------------------------------------===//
9 
10 #include "GlobalCompilationDatabase.h"
11 #include "clang/Tooling/CompilationDatabase.h"
12 #include "llvm/Support/FileSystem.h"
13 #include "llvm/Support/Path.h"
14 
15 using namespace clang::clangd;
16 using namespace clang;
17 
18 std::vector<tooling::CompileCommand>
19 DirectoryBasedGlobalCompilationDatabase::getCompileCommands(PathRef File) {
20   std::vector<tooling::CompileCommand> Commands;
21 
22   auto CDB = getCompilationDatabase(File);
23   if (!CDB)
24     return {};
25   return CDB->getCompileCommands(File);
26 }
27 
28 tooling::CompilationDatabase *
29 DirectoryBasedGlobalCompilationDatabase::getCompilationDatabase(PathRef File) {
30   std::lock_guard<std::mutex> Lock(Mutex);
31 
32   namespace path = llvm::sys::path;
33 
34   assert((path::is_absolute(File, path::Style::posix) ||
35           path::is_absolute(File, path::Style::windows)) &&
36          "path must be absolute");
37 
38   for (auto Path = path::parent_path(File); !Path.empty();
39        Path = path::parent_path(Path)) {
40 
41     auto CachedIt = CompilationDatabases.find(Path);
42     if (CachedIt != CompilationDatabases.end())
43       return CachedIt->second.get();
44     std::string Error;
45     auto CDB = tooling::CompilationDatabase::loadFromDirectory(Path, Error);
46     if (!CDB) {
47       if (!Error.empty()) {
48         // FIXME(ibiryukov): logging
49         // Output.log("Error when trying to load compilation database from " +
50         //            Twine(Path) + ": " + Twine(Error) + "\n");
51       }
52       continue;
53     }
54 
55     // FIXME(ibiryukov): Invalidate cached compilation databases on changes
56     auto result = CDB.get();
57     CompilationDatabases.insert(std::make_pair(Path, std::move(CDB)));
58     return result;
59   }
60 
61   // FIXME(ibiryukov): logging
62   // Output.log("Failed to find compilation database for " + Twine(File) +
63   // "\n");
64   return nullptr;
65 }
66