fix(core): fix memory leak in Global singleton, test=develop

lite/core/context.h

@@ -395,7 +395,7 @@ class KernelContext {
 class ContextScheduler {
  public:
   static ContextScheduler& Global() {
-    static auto* x = new ContextScheduler;
+    static auto x = std::unique_ptr<ContextScheduler>(new ContextScheduler);
     return *x;
   }
 

lite/core/device_info.h

@@ -15,6 +15,7 @@
 #pragma once
 
 #include <cstdarg>
+#include <memory>
 #include <string>
 #include <vector>
 #include "lite/core/tensor.h"
@@ -43,7 +44,7 @@ typedef enum {
 class DeviceInfo {
  public:
   static DeviceInfo& Global() {
-    static auto* x = new DeviceInfo;
+    static auto x = std::unique_ptr<DeviceInfo>(new DeviceInfo);
     return *x;
   }
 
@@ -156,7 +157,7 @@ class Env {
   typedef TargetWrapper<Type> API;
   typedef std::vector<Device<Type>> Devs;
   static Devs& Global() {
-    static Devs* devs = new Devs();
+    static auto devs = std::unique_ptr<Devs>(new Devs);
     return *devs;
   }
   static void Init(int max_stream = 6) {

lite/core/op_registry.cc

@@ -14,6 +14,7 @@
 
 #include "lite/core/op_registry.h"
 #include <list>
+#include <memory>
 #include <set>
 
 namespace paddle {
@@ -248,7 +249,7 @@ KernelRegistry::KernelRegistry()
 }
 
 KernelRegistry &KernelRegistry::Global() {
-  static auto *x = new KernelRegistry;
+  static auto x = std::unique_ptr<KernelRegistry>(new KernelRegistry);
   return *x;
 }
 

lite/utils/factory.h

@@ -48,7 +48,7 @@ class Factory {
   using creator_t = std::function<item_ptr_t()>;
 
   static Factory& Global() {
-    static Factory* x = new self_t;
+    static auto x = std::unique_ptr<self_t>(new self_t);
     return *x;
   }