[lldb] Store SupportFile as shared_ptr (NFC)

Author: JDevlieghere

lldb/include/lldb/Utility/FileSpecList.h

@@ -25,21 +25,22 @@ class SupportFileList {
   SupportFileList(const SupportFileList &) = delete;
   SupportFileList(SupportFileList &&other) = default;
 
-  typedef std::vector<std::unique_ptr<SupportFile>> collection;
+  typedef std::vector<std::shared_ptr<SupportFile>> collection;
   typedef collection::const_iterator const_iterator;
   const_iterator begin() const { return m_files.begin(); }
   const_iterator end() const { return m_files.end(); }
 
   void Append(const FileSpec &file) {
-    return Append(std::make_unique<SupportFile>(file));
+    return Append(std::make_shared<SupportFile>(file));
   }
-  void Append(std::unique_ptr<SupportFile> &&file) {
+  void Append(std::shared_ptr<SupportFile> &&file) {
     m_files.push_back(std::move(file));
   }
   // FIXME: Only used by SymbolFilePDB. Replace with a DenseSet at call site.
   bool AppendIfUnique(const FileSpec &file);
   size_t GetSize() const { return m_files.size(); }
   const FileSpec &GetFileSpecAtIndex(size_t idx) const;
+  std::shared_ptr<SupportFile> GetSupportFileAtIndex(size_t idx) const;
   size_t FindFileIndex(size_t idx, const FileSpec &file, bool full) const;
   /// Find a compatible file index.
   ///
@@ -69,7 +70,7 @@ class SupportFileList {
 
   template <class... Args> void EmplaceBack(Args &&...args) {
     m_files.push_back(
-        std::make_unique<SupportFile>(std::forward<Args>(args)...));
+        std::make_shared<SupportFile>(std::forward<Args>(args)...));
   }
 
 protected:

lldb/source/Utility/FileSpecList.cpp

@@ -41,7 +41,7 @@ bool FileSpecList::AppendIfUnique(const FileSpec &file_spec) {
 bool SupportFileList::AppendIfUnique(const FileSpec &file_spec) {
   collection::iterator end = m_files.end();
   if (find_if(m_files.begin(), end,
-              [&](const std::unique_ptr<SupportFile> &support_file) {
+              [&](const std::shared_ptr<SupportFile> &support_file) {
                 return support_file->GetSpecOnly() == file_spec;
               }) == end) {
     Append(file_spec);
@@ -176,6 +176,13 @@ const FileSpec &SupportFileList::GetFileSpecAtIndex(size_t idx) const {
   return g_empty_file_spec;
 }
 
+std::shared_ptr<SupportFile>
+SupportFileList::GetSupportFileAtIndex(size_t idx) const {
+  if (idx < m_files.size())
+    return m_files[idx];
+  return {};
+}
+
 // Return the size in bytes that this object takes in memory. This returns the
 // size in bytes of this object's member variables and any FileSpec objects its
 // member variables contain, the result doesn't not include the string values