Make CompileUnit::GetSupportFiles return a const list

There's no reason for anyone to modify a list from outside of a symbol
file (as that would break a lot of invariants that symbol files depend
on).

Make the function return a const FileSpecList and fix up a couple of
places that were needlessly binding non-const references to the result
of this function.

llvm-svn: 362069

1 files changed, 6 insertions, 8 deletions

diff --git a/lldb/source/API/SBCompileUnit.cpp b/lldb/source/API/SBCompileUnit.cpp
index 48b501043e1..c9ca70645d9 100644
--- a/lldb/source/API/SBCompileUnit.cpp
+++ b/lldb/source/API/SBCompileUnit.cpp
@@ -118,10 +118,9 @@ uint32_t SBCompileUnit::FindLineEntryIndex(uint32_t start_idx, uint32_t line,
 uint32_t SBCompileUnit::GetNumSupportFiles() const {
   LLDB_RECORD_METHOD_CONST_NO_ARGS(uint32_t, SBCompileUnit, GetNumSupportFiles);
 
-  if (m_opaque_ptr) {
-    FileSpecList &support_files = m_opaque_ptr->GetSupportFiles();
-    return support_files.GetSize();
-  }
+  if (m_opaque_ptr)
+    return m_opaque_ptr->GetSupportFiles().GetSize();
+
   return 0;
 }
 
@@ -155,9 +154,8 @@ SBFileSpec SBCompileUnit::GetSupportFileAtIndex(uint32_t idx) const {
 
   SBFileSpec sb_file_spec;
   if (m_opaque_ptr) {
-    FileSpecList &support_files = m_opaque_ptr->GetSupportFiles();
-    FileSpec file_spec = support_files.GetFileSpecAtIndex(idx);
-    sb_file_spec.SetFileSpec(file_spec);
+    FileSpec spec = m_opaque_ptr->GetSupportFiles().GetFileSpecAtIndex(idx);
+    sb_file_spec.SetFileSpec(spec);
   }
 
 
@@ -172,7 +170,7 @@ uint32_t SBCompileUnit::FindSupportFileIndex(uint32_t start_idx,
                      sb_file, full);
 
   if (m_opaque_ptr) {
-    FileSpecList &support_files = m_opaque_ptr->GetSupportFiles();
+    const FileSpecList &support_files = m_opaque_ptr->GetSupportFiles();
     return support_files.FindFileIndex(start_idx, sb_file.ref(), full);
   }
   return 0;