Generate debug symbols for interpreted methods.

Add .symtab symbols for method bytecodes in the dex section
(only if the full --generate-debug-info is enabled for now).

Test: m test-art-host-gtest
Test: testrunner.py -b --host --optimizing

Change-Id: Ie90034c921484bc4ff27c5458da78690b629dd0b
diff --git a/compiler/debug/debug_info.h b/compiler/debug/debug_info.h
new file mode 100644
index 0000000..04c6991
--- /dev/null
+++ b/compiler/debug/debug_info.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_DEBUG_DEBUG_INFO_H_
+#define ART_COMPILER_DEBUG_DEBUG_INFO_H_
+
+#include <map>
+
+#include "base/array_ref.h"
+#include "method_debug_info.h"
+
+namespace art {
+class DexFile;
+
+namespace debug {
+
+// References inputs for all debug information which can be written into the ELF file.
+struct DebugInfo {
+  // Describes compiled code in the .text section.
+  ArrayRef<const MethodDebugInfo> compiled_methods;
+
+  // Describes dex-files in the .dex section.
+  std::map<uint32_t, const DexFile*> dex_files;  // Offset in section -> dex file content.
+
+  bool Empty() const {
+    return compiled_methods.empty() && dex_files.empty();
+  }
+};
+
+}  // namespace debug
+}  // namespace art
+
+#endif  // ART_COMPILER_DEBUG_DEBUG_INFO_H_