support build with address sanitizer and fix some memory leaks (#86)

* support build with address sanitizer

using cmake options `-DENALBE_ASAN=ON` to enable address sanitizer

* fix some memory leaks detected by asan

CMakeLists.txt

@@ -55,6 +55,13 @@ SET(CMAKE_CXX_FLAGS ${CMAKE_COMMON_FLAGS})
 SET(CMAKE_C_FLAGS ${CMAKE_COMMON_FLAGS})
 MESSAGE("CMAKE_CXX_FLAGS is " ${CMAKE_CXX_FLAGS})
 
+OPTION(ENABLE_ASAN OFF "Enable build with address sanitizer")
+
+IF (ENABLE_ASAN)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-omit-frame-pointer -fsanitize=address")
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer -fsanitize=address")
+    SET(CMAKE_LINKER_FLAGS_DEBUG  "${CMAKE_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
+ENDIF()
 
 IF (CMAKE_INSTALL_PREFIX)
     MESSAGE("CMAKE_INSTALL_PREFIX has been set as " ${CMAKE_INSTALL_PREFIX} )

deps/common/lang/lru_cache.h

@@ -215,6 +215,7 @@ private:
     }
 
     searcher_.erase(node);
+    delete node;
   }
 
 private:

src/observer/event/sql_event.cpp

@@ -13,7 +13,12 @@ See the Mulan PSL v2 for more details. */
 //
 
 #include "event/sql_event.h"
+
+#include <cstddef>
+
 #include "event/session_event.h"
+#include "sql/parser/parse_defs.h"
+#include "sql/stmt/stmt.h"
 
 SQLStageEvent::SQLStageEvent(SessionEvent *event, const std::string &sql) : session_event_(event), sql_(sql)
 {}
@@ -26,4 +31,14 @@ SQLStageEvent::~SQLStageEvent() noexcept
     // session_event_ = nullptr;
     // session_event->doneImmediate();
   }
+
+  if (query_ != nullptr) {
+    query_destroy(query_);
+    query_ = nullptr;
+  }
+
+  if (stmt_ != nullptr) {
+    delete stmt_;
+    stmt_ = nullptr;
+  }
 }