!4674 [MS][LITE][Develop]refactor kernel creator

Merge pull request !4674 from sunsuodong/refactor_kernel_creator

mindspore/lite/src/kernel_registry.cc

@@ -28,30 +28,8 @@ using mindspore::kernel::kCPU;
 using mindspore::kernel::KERNEL_ARCH;
 using mindspore::kernel::KernelCreator;
 using mindspore::kernel::KernelKey;
-using mindspore::kernel::kKernelArch_MAX;
-using mindspore::kernel::kKernelArch_MIN;
-using mindspore::schema::PrimitiveType_MAX;
-using mindspore::schema::PrimitiveType_MIN;
 
 namespace mindspore::lite {
-KernelRegistry::KernelRegistry() {
-  device_type_length_ = kKernelArch_MAX - kKernelArch_MIN + 1;
-  data_type_length_ = kNumberTypeEnd - kNumberTypeBegin + 1;
-  op_type_length_ = PrimitiveType_MAX - PrimitiveType_MIN + 1;
-  // malloc an array contain creator functions of kernel
-  array_size_ = device_type_length_ * data_type_length_ * op_type_length_;
-  creator_arrays_ = (kernel::KernelCreator *)malloc(array_size_ * sizeof(kernel::KernelCreator));
-  if (creator_arrays_ == nullptr) {
-    MS_LOG(ERROR) << "malloc creator_arrays_ failed.";
-  } else {
-    for (int i = 0; i < array_size_; ++i) {
-      creator_arrays_[i] = nullptr;
-    }
-  }
-}
-
-KernelRegistry::~KernelRegistry() { FreeCreatorArray(); }
-
 KernelRegistry *KernelRegistry::GetInstance() {
   static KernelRegistry instance;
   return &instance;
@@ -69,18 +47,7 @@ int KernelRegistry::Init() {
   return RET_OK;
 }
 
-void KernelRegistry::FreeCreatorArray() {
-  if (creator_arrays_ != nullptr) {
-    free(creator_arrays_);
-    creator_arrays_ = nullptr;
-  }
-}
-
 kernel::KernelCreator KernelRegistry::GetCreator(const KernelKey &desc) {
-  if (creator_arrays_ == nullptr) {
-    MS_LOG(ERROR) << "Creator func array is null.";
-    return nullptr;
-  }
   int index = GetCreatorFuncIndex(desc);
   if (index >= array_size_) {
     MS_LOG(ERROR) << "invalid kernel key, arch " << desc.arch << ", data_type" << desc.data_type << ",op type "
@@ -104,20 +71,17 @@ int KernelRegistry::GetCreatorFuncIndex(const kernel::KernelKey desc) {
 }
 
 void KernelRegistry::RegKernel(const KernelKey desc, kernel::KernelCreator creator) {
-  if (creator_arrays_ == nullptr) {
-    MS_LOG(ERROR) << "Creator func array is null.";
+  int index = GetCreatorFuncIndex(desc);
+  if (index >= array_size_) {
+    MS_LOG(ERROR) << "invalid kernel key, arch " << desc.arch << ", data_type" << desc.data_type << ",op type "
+                  << desc.type;
     return;
   }
-  int index = GetCreatorFuncIndex(desc);
   creator_arrays_[index] = creator;
 }
 
 void KernelRegistry::RegKernel(const KERNEL_ARCH arch, const TypeId data_type, const schema::PrimitiveType op_type,
                                kernel::KernelCreator creator) {
-  if (creator_arrays_ == nullptr) {
-    MS_LOG(ERROR) << "Creator func array is null.";
-    return;
-  }
   KernelKey desc = {arch, data_type, op_type};
   int index = GetCreatorFuncIndex(desc);
   if (index >= array_size_) {

mindspore/lite/src/kernel_registry.h

@@ -23,11 +23,16 @@
 #include "src/lite_kernel.h"
 #include "schema/model_generated.h"
 
+using mindspore::kernel::kKernelArch_MAX;
+using mindspore::kernel::kKernelArch_MIN;
+using mindspore::schema::PrimitiveType_MAX;
+using mindspore::schema::PrimitiveType_MIN;
+
 namespace mindspore::lite {
 class KernelRegistry {
  public:
-  KernelRegistry();
-  virtual ~KernelRegistry();
+  KernelRegistry() = default;
+  virtual ~KernelRegistry() = default;
 
   static KernelRegistry *GetInstance();
   int Init();
@@ -44,11 +49,11 @@ class KernelRegistry {
                                 const Context *ctx, const kernel::KernelKey &key);
 
  protected:
-  kernel::KernelCreator *creator_arrays_ = nullptr;
-  size_t array_size_;
-  int device_type_length_;
-  int data_type_length_;
-  int op_type_length_;
+  static const int device_type_length_{kKernelArch_MAX - kKernelArch_MIN + 1};
+  static const int data_type_length_{kNumberTypeEnd - kNumberTypeBegin + 1};
+  static const int op_type_length_{PrimitiveType_MAX - PrimitiveType_MIN + 1};
+  static const int array_size_{device_type_length_ * data_type_length_ * op_type_length_};
+  kernel::KernelCreator creator_arrays_[array_size_] = {0};
 };
 
 class KernelRegistrar {