add describe for db_mgr

src/db_mgr/include/db_mgr/db_mgr.h

+#pragma once
+
+#ifndef _DB_MGR_H_
+#define _DB_MGR_H_
+
+#include <unordered_map>
+#include <string>
+
+namespace odb {
+class dbDatabase;
+}
+
+// Logger symbol: MGR
+namespace utl {
+class Logger;
+}
+
+/* DB Manager: for hierarchical design. A hierarchical design 
+ * contains multiple sub-block within the 'top' module. Because
+ * dbBlock class in OpenDB only supports two-levels of hierarchy,
+ * I choose to use a dbDatabase to represent a Block.
+ *
+ * NOTE: OpenDB claims that it supports that a dbDataBase can 
+ * store multiple dbChip, but denote with "DEPRECATE".
+ *
+ * A hierarchical design:
+ * * ---------TOP--------- *
+ * | * ------- * ------- * |
+ * | |         |         | |
+ * | | Block A | Block B | |
+ * | |         |         | |
+ * | * ------- * ------- * |
+ * | |         |         | |
+ * | | Block C | Block D | |
+ * | |         |         | |
+ * | * ------- * ------- * |
+ * * --------------------- *
+ * Abutting Style: no spare cells amonng Blocks.
+*/
+class DbMgr {
+public:
+  DbMgr();
+  void deleteDbMgr(); // dbDatadase::destroy()
+  bool readLibDB();
+  bool readBlockDBs();
+  bool addBlockDB();
+  bool deleteBlockDB();
+  bool haveBlockDB(std::string block);
+
+private:
+  /* all Blocks share the same lib (.lef files)
+   * First, read the lib files into the lib_db_.
+   * Then, for each block, create a new db with copy of 
+   * lib_db_, by `dbDatabase::duplicate(lib_db_)` 
+  */
+  odb::dbDatabase* lib_db_;
+  /* use a STL Hash table to store Block DBs.
+   * use the block name as key.
+   * check if there exists duplicate name when inserting
+   * blocks.
+  */
+  std::unordered_map<std::string, odb::dbDatabase> block_dbs_;
+
+};
+
+#endif  // _DB_MGR_H_
+

src/utl/include/utl/Logger.h

@@ -49,34 +49,16 @@
 namespace utl {
 
 #define FOREACH_TOOL(X) \
-    X(ANT) \
-    X(CTS) \
-    X(DPL) \
-    X(DPO) \
-    X(DRT) \
-    X(DST) \
-    X(FIN) \
-    X(FLW) \
+    X(EDA) \
+    X(ODB) \
+    X(MGR) \
     X(GPL) \
     X(GRT) \
-    X(GUI) \
     X(PAD) \
     X(IFP) \
     X(MPL) \
-    X(ODB) \
-    X(EDA) \
     X(PAR) \
-    X(PDN) \
-    X(PDR) \
-    X(PPL) \
-    X(PSM) \
-    X(PSN) \
-    X(RCX) \
-    X(RMP) \
-    X(RSZ) \
-    X(STA) \
     X(STT) \
-    X(TAP) \
     X(UKN) \
 
 #define GENERATE_ENUM(ENUM) ENUM,