ObjectFile: remove ReadSectionData/MemoryMapSectionData mutual recursion

Summary:
These two functions were calling each other, while handling different
branches of the if(IsInMemory()). This had a reason at some point in the
past, but right now it's just confusing.

I resolve this by removing the MemoryMapSectionData function and
inlining the !IsInMemory branch into ReadSectionData. There isn't
anything mmap-related in this function anyway, as the decision whether
to mmap is handled at a higher level.

This is a preparatory step to make ObjectFileELF be able to decompress
compressed sections (I want to make sure that all calls reading section
data are routed through a single piece of code).

Reviewers: clayborg

Subscribers: emaste, JDevlieghere, lldb-commits

Differential Revision: https://reviews.llvm.org/D41169

llvm-svn: 320705

3 files changed, 1 insertions, 22 deletions

diff --git a/lldb/include/lldb/Symbol/ObjectFile.h b/lldb/include/lldb/Symbol/ObjectFile.h
index 60a748bb39d..0708b7c47f3 100644
--- a/lldb/include/lldb/Symbol/ObjectFile.h
+++ b/lldb/include/lldb/Symbol/ObjectFile.h
@@ -805,9 +805,6 @@ public:
   virtual size_t ReadSectionData(Section *section,
                                  DataExtractor &section_data);
 
-  size_t MemoryMapSectionData(Section *section,
-                              DataExtractor &section_data);
-
   bool IsInMemory() const { return m_memory_addr != LLDB_INVALID_ADDRESS; }
 
   // Strip linker annotations (such as @@VERSION) from symbol names.
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index d7e13edeecd..f149ec354f0 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -444,10 +444,8 @@ void SymbolFileDWARF::InitializeObject() {
     Section *section =
         section_list->FindSectionByName(GetDWARFMachOSegmentName()).get();
 
-    // Memory map the DWARF mach-o segment so we have everything mmap'ed
-    // to keep our heap memory usage down.
     if (section)
-      m_obj_file->MemoryMapSectionData(section, m_dwarf_data);
+      m_obj_file->ReadSectionData(section, m_dwarf_data);
   }
 
   get_apple_names_data();
diff --git a/lldb/source/Symbol/ObjectFile.cpp b/lldb/source/Symbol/ObjectFile.cpp
index 39593bc6e2b..7d73cb19d50 100644
--- a/lldb/source/Symbol/ObjectFile.cpp
+++ b/lldb/source/Symbol/ObjectFile.cpp
@@ -561,25 +561,9 @@ size_t ObjectFile::ReadSectionData(Section *section,
   } else {
     // The object file now contains a full mmap'ed copy of the object file data,
     // so just use this
-    return MemoryMapSectionData(section, section_data);
-  }
-}
-
-size_t ObjectFile::MemoryMapSectionData(Section *section,
-                                        DataExtractor &section_data) {
-  // If some other objectfile owns this data, pass this to them.
-  if (section->GetObjectFile() != this)
-    return section->GetObjectFile()->MemoryMapSectionData(section,
-                                                          section_data);
-
-  if (IsInMemory()) {
-    return ReadSectionData(section, section_data);
-  } else {
     if (!section->IsRelocated())
       RelocateSection(section);
 
-    // The object file now contains a full mmap'ed copy of the object file data,
-    // so just use this
     return GetData(section->GetFileOffset(), section->GetFileSize(),
                    section_data);
   }