Adds support for auto-detection of compilation databases, looking in a directory and all its parents.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159998 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 9 deletions

diff --git a/lib/Tooling/CompilationDatabase.cpp b/lib/Tooling/CompilationDatabase.cpp
index 8e911123bc..a06343ddab 100644
--- a/lib/Tooling/CompilationDatabase.cpp
+++ b/lib/Tooling/CompilationDatabase.cpp
@@ -122,23 +122,47 @@ CompilationDatabase::loadFromDirectory(StringRef BuildDirectory,
   return Database.take();
 }
 
-CompilationDatabase *
-CompilationDatabase::autoDetectFromSource(StringRef SourceFile,
-                                          std::string &ErrorMessage) {
-  llvm::SmallString<1024> AbsolutePath(getAbsolutePath(SourceFile));
-  StringRef Directory = llvm::sys::path::parent_path(AbsolutePath);
+static CompilationDatabase *
+findCompilationDatabaseFromDirectory(StringRef Directory) {
   while (!Directory.empty()) {
     std::string LoadErrorMessage;
-    if (CompilationDatabase *DB = loadFromDirectory(Directory,
-                                                    LoadErrorMessage))
+
+    if (CompilationDatabase *DB =
+           CompilationDatabase::loadFromDirectory(Directory, LoadErrorMessage))
       return DB;
+
     Directory = llvm::sys::path::parent_path(Directory);
   }
-  ErrorMessage = ("Could not auto-detect compilation database for file \"" +
-                  SourceFile + "\"").str();
   return NULL;
 }
 
+CompilationDatabase *
+CompilationDatabase::autoDetectFromSource(StringRef SourceFile,
+                                          std::string &ErrorMessage) {
+  llvm::SmallString<1024> AbsolutePath(getAbsolutePath(SourceFile));
+  StringRef Directory = llvm::sys::path::parent_path(AbsolutePath);
+
+  CompilationDatabase *DB = findCompilationDatabaseFromDirectory(Directory);
+
+  if (!DB)
+    ErrorMessage = ("Could not auto-detect compilation database for file \"" +
+                   SourceFile + "\"").str();
+  return DB;
+}
+
+CompilationDatabase *
+CompilationDatabase::autoDetectFromDirectory(StringRef SourceDir,
+                                             std::string &ErrorMessage) {
+  llvm::SmallString<1024> AbsolutePath(getAbsolutePath(SourceDir));
+
+  CompilationDatabase *DB = findCompilationDatabaseFromDirectory(AbsolutePath);
+
+  if (!DB)
+    ErrorMessage = ("Could not auto-detect compilation database from directory \"" +
+                   SourceDir + "\"").str();
+  return DB;
+}
+
 FixedCompilationDatabase *
 FixedCompilationDatabase::loadFromCommandLine(int &Argc,
                                               const char **Argv,