Refactor oat file writing to give Dex2Oat more control.

This is the first step towards writing dex files to oat file
and mapping them from there for the actual AOT compilation.

Change-Id: Icb0d27487eaf6ba3a66c157e695f9bdc5bb9cf9a
diff --git a/compiler/elf_writer.h b/compiler/elf_writer.h
index 03f8ceb..357d5f6 100644
--- a/compiler/elf_writer.h
+++ b/compiler/elf_writer.h
@@ -25,13 +25,16 @@
 #include "base/macros.h"
 #include "base/mutex.h"
 #include "os.h"
+#include "utils/array_ref.h"
 
 namespace art {
 
-class CompilerDriver;
-class DexFile;
 class ElfFile;
-class OatWriter;
+class OutputStream;
+
+namespace dwarf {
+struct MethodDebugInfo;
+}  // namespace dwarf
 
 class ElfWriter {
  public:
@@ -46,21 +49,21 @@
 
   static bool Fixup(File* file, uintptr_t oat_data_begin);
 
- protected:
-  ElfWriter(const CompilerDriver& driver, File* elf_file)
-    : compiler_driver_(&driver), elf_file_(elf_file) {
-  }
-
   virtual ~ElfWriter() {}
 
-  virtual bool Write(OatWriter* oat_writer,
-                     const std::vector<const DexFile*>& dex_files,
-                     const std::string& android_root,
-                     bool is_host)
-      SHARED_REQUIRES(Locks::mutator_lock_) = 0;
+  virtual void Start() = 0;
+  virtual OutputStream* StartRoData() = 0;
+  virtual void EndRoData(OutputStream* rodata) = 0;
+  virtual OutputStream* StartText() = 0;
+  virtual void EndText(OutputStream* text) = 0;
+  virtual void SetBssSize(size_t bss_size) = 0;
+  virtual void WriteDynamicSection() = 0;
+  virtual void WriteDebugInfo(const ArrayRef<const dwarf::MethodDebugInfo>& method_infos) = 0;
+  virtual void WritePatchLocations(const ArrayRef<const uintptr_t>& patch_locations) = 0;
+  virtual bool End() = 0;
 
-  const CompilerDriver* const compiler_driver_;
-  File* const elf_file_;
+ protected:
+  ElfWriter() = default;
 };
 
 }  // namespace art