From c54ae2b7789a310fca6ea989ac47896366f9a964 Mon Sep 17 00:00:00 2001
From: yangjie159 <yangjie159@huawei.com>
Date: Sat, 15 May 2021 10:42:23 +0800
Subject: [PATCH] move self-defined String implementation to lite_utils.h

---
 mindspore/lite/include/lite_utils.h           | 317 ++++++++++++++---
 mindspore/lite/micro/cmake/file_list.cmake    |   3 +-
 .../generator/component/cmake_component.cc    |   3 +-
 .../const_blocks/{model.cc => mmodel.cc}      |   2 +-
 .../const_blocks/{model.h => mmodel.h}        |   0
 .../component/const_blocks/mstring.cc         | 330 ------------------
 .../component/const_blocks/mstring.h          |  26 --
 .../lite/micro/coder/generator/generator.cc   |   8 +-
 8 files changed, 284 insertions(+), 405 deletions(-)
 rename mindspore/lite/micro/coder/generator/component/const_blocks/{model.cc => mmodel.cc} (97%)
 rename mindspore/lite/micro/coder/generator/component/const_blocks/{model.h => mmodel.h} (100%)
 delete mode 100644 mindspore/lite/micro/coder/generator/component/const_blocks/mstring.cc
 delete mode 100644 mindspore/lite/micro/coder/generator/component/const_blocks/mstring.h

diff --git a/mindspore/lite/include/lite_utils.h b/mindspore/lite/include/lite_utils.h
index 295d3081528..cf7a4d073fe 100644
--- a/mindspore/lite/include/lite_utils.h
+++ b/mindspore/lite/include/lite_utils.h
@@ -27,6 +27,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stddef.h>
+#include <stdio.h>
+#include <float.h>
 #include <new>
 #endif  // NOT_USE_STL
 
@@ -52,46 +54,266 @@ struct DeviceContext;
 }  // namespace lite
 
 #ifdef NOT_USE_STL
+#define MS_C_EXCEPTION(...) exit(1)
+
 class String {
  public:
-  String();
-  String(size_t count, char ch);
-  String(const char *s, size_t count);
-  explicit String(const char *s);
-  String(const String &other);
-  String(const String &other, size_t pos, size_t count = npos);
+  String() {
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    buffer_[0] = '\0';
+    size_ = 0;
+  }
 
-  ~String();
+  String(size_t count, char ch) {
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (count + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    memset(buffer_, ch, count);
+    buffer_[count] = '\0';
+    size_ = count;
+  }
 
-  String &operator=(const String &str);
-  String &operator=(const char *str);
+  String(const char *s, size_t count) {
+    if (s == nullptr) {
+      buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+      if (buffer_ == nullptr) {
+        MS_C_EXCEPTION("malloc data failed");
+      }
+      buffer_[0] = '\0';
+      size_ = 0;
+      return;
+    }
+    size_t size_s = strlen(s);
+    if (size_s <= count) {
+      size_ = size_s;
+    } else {
+      size_ = count;
+    }
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    strncpy(buffer_, s, size_);
+    buffer_[size_] = '\0';
+  }
 
-  char &at(size_t pos);
-  const char &at(size_t pos) const;
-  inline char &operator[](size_t pos);
-  inline const char &operator[](size_t pos) const;
-  char *data() noexcept;
-  const char *data() const noexcept;
-  const char *c_str() const noexcept;
+  explicit String(const char *s) {
+    if (s == nullptr) {
+      buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+      if (buffer_ == nullptr) {
+        MS_C_EXCEPTION("malloc data failed");
+      }
+      buffer_[0] = '\0';
+      size_ = 0;
+      return;
+    }
+    size_ = strlen(s);
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    memcpy(buffer_, s, size_ + 1);
+  }
+
+  String(const String &other) {
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (other.size_ + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    size_ = other.size_;
+    memcpy(buffer_, other.buffer_, size_ + 1);
+  }
+
+  String(const String &other, size_t pos, size_t count = npos) {
+    if (pos >= other.size_) {
+      buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+      if (buffer_ == nullptr) {
+        MS_C_EXCEPTION("malloc data failed");
+      }
+      buffer_[0] = '\0';
+      size_ = 0;
+    } else {
+      if (count == npos) {
+        count = other.size_ - pos;
+      }
+      if (pos + count > other.size_) {
+        size_ = other.size_ - pos;
+      } else {
+        size_ = count;
+      }
+      buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
+      if (buffer_ == nullptr) {
+        MS_C_EXCEPTION("malloc data failed");
+      }
+      strncpy(buffer_, other.buffer_ + pos, size_);
+      buffer_[size_] = '\0';
+    }
+  }
+
+  ~String() { free(buffer_); }
+
+  String &operator=(const String &str) {
+    if (this == &str) {
+      return *this;
+    }
+    free(buffer_);
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (str.size_ + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    size_ = str.size_;
+    memcpy(buffer_, str.buffer_, size_ + 1);
+    return *this;
+  }
+
+  String &operator=(const char *str) {
+    free(buffer_);
+    if (str == nullptr) {
+      buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+      if (buffer_ == nullptr) {
+        MS_C_EXCEPTION("malloc data failed");
+      }
+      buffer_[0] = '\0';
+      size_ = 0;
+      return *this;
+    }
+    size_t size_s = strlen(str);
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_s + 1)));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    size_ = size_s;
+    memcpy(buffer_, str, size_ + 1);
+    return *this;
+  }
+
+  char &at(size_t pos) {
+    if (pos >= size_) {
+      MS_C_EXCEPTION("pos out of range");
+    }
+    return buffer_[pos];
+  }
+
+  const char &at(size_t pos) const {
+    if (pos >= size_) {
+      MS_C_EXCEPTION("pos out of range");
+    }
+    return buffer_[pos];
+  }
+
+  inline char &operator[](size_t pos) {
+    if (pos >= size_) {
+      MS_C_EXCEPTION("pos out of range");
+    }
+    return this->at(pos);
+  }
+
+  inline const char &operator[](size_t pos) const {
+    if (pos >= size_) {
+      MS_C_EXCEPTION("pos out of range");
+    }
+    return this->at(pos);
+  }
+
+  char *data() noexcept { return buffer_; }
+  const char *data() const noexcept { return buffer_; }
+  const char *c_str() const noexcept { return buffer_; }
 
   // capacity
-  bool empty() const noexcept;
-  size_t size() const noexcept;
-  size_t length() const noexcept;
+  bool empty() const noexcept { return size_ == 0; }
+  size_t size() const noexcept { return size_; }
+  size_t length() const noexcept { return size_; }
 
   // operations
-  void clear() noexcept;
-  String &append(size_t count, const char ch);
-  String &append(const String &str);
-  String &append(const char *s);
-  String &operator+(const String &str);
-  String &operator+=(const String &str);
-  String &operator+=(const char *str);
-  String &operator+=(const char ch);
-  int compare(const String &str) const;
-  int compare(const char *str) const;
+  void clear() noexcept {
+    free(buffer_);
+    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
+    if (buffer_ == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    buffer_[0] = '\0';
+    size_ = 0;
+  }
 
-  String substr(size_t pos = 0, size_t count = npos) const;
+  String &append(size_t count, const char ch) {
+    (*this) += ch;
+    return *this;
+  }
+
+  String &append(const String &str) {
+    (*this) += str;
+    return *this;
+  }
+
+  String &append(const char *str) {
+    if (str == nullptr) {
+      return *this;
+    }
+    (*this) += str;
+    return *this;
+  }
+
+  String &operator+(const String &str) {
+    (*this) += str;
+    return *this;
+  }
+
+  String &operator+=(const String &str) {
+    size_t new_size = size_ + str.size_;
+    char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (new_size + 1)));
+    if (tmp == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    memcpy(tmp, this->buffer_, size_ + 1);
+    strncat(tmp, str.buffer_, str.size_);
+    tmp[new_size] = '\0';
+    free(buffer_);
+    buffer_ = tmp;
+    size_ = new_size;
+    return *this;
+  }
+
+  String &operator+=(const char *str) {
+    if (str == nullptr) {
+      return *this;
+    }
+    size_t str_size = strlen(str);
+    size_t new_size = size_ + str_size;
+    char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (new_size + 1)));
+    if (tmp == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    memcpy(tmp, this->buffer_, size_ + 1);
+    strncat(tmp, str, str_size);
+    tmp[new_size] = '\0';
+    free(buffer_);
+    buffer_ = tmp;
+    size_ = new_size;
+    return *this;
+  }
+
+  String &operator+=(const char ch) {
+    char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 2)));
+    if (tmp == nullptr) {
+      MS_C_EXCEPTION("malloc data failed");
+    }
+    memcpy(tmp, this->buffer_, size_ + 1);
+    tmp[size_] = ch;
+    tmp[size_ + 1] = '\0';
+    free(buffer_);
+    buffer_ = tmp;
+    size_ += 1;
+    return *this;
+  }
+
+  int compare(const String &str) const { return strcmp(buffer_, str.buffer_); }
+  int compare(const char *str) const { return strcmp(buffer_, str); }
+
+  String substr(size_t pos = 0, size_t count = npos) const { return String(*this, pos, count); }
 
   static const size_t npos = -1;
 
@@ -100,19 +322,36 @@ class String {
   char *buffer_;
 };
 
-String operator+(const String &lhs, const char *rhs);
-String operator+(const char *lhs, const String &rhs);
+inline String operator+(const String &lhs, const char *rhs) {
+  String str = lhs;
+  str += rhs;
+  return str;
+}
 
-bool operator!=(const String &lhs, const String &rhs);
-bool operator==(const String &lhs, const String &rhs);
-bool operator==(const String &lhs, const char *rhs);
-bool operator==(const char *lhs, const String &rhs);
+inline String operator+(const char *lhs, const String &rhs) {
+  String str = rhs;
+  str += lhs;
+  return str;
+}
 
-String to_string(int32_t value);
-String to_string(float value);
+inline bool operator!=(const String &lhs, const String &rhs) { return lhs.compare(rhs) != 0; }
+inline bool operator==(const String &lhs, const String &rhs) { return lhs.compare(rhs) == 0; }
+inline bool operator==(const String &lhs, const char *rhs) { return lhs.compare(rhs) == 0; }
+inline bool operator==(const char *lhs, const String &rhs) { return rhs.compare(lhs) == 0; }
+
+inline String to_String(int32_t value) {
+  char tmp[sizeof(int32_t) * 4];
+  snprintf(tmp, sizeof(int32_t) * 4, "%d", value);
+  return String(tmp, strlen(tmp));
+}
+
+inline String to_String(float value) {
+  char tmp[FLT_MAX_10_EXP + 20];
+  snprintf(tmp, FLT_MAX_10_EXP + 20, "%f", value);
+  return String(tmp, strlen(tmp));
+}
 
 #define DEFAULT_CAPACITY 4
-#define MS_C_EXCEPTION(...) exit(1)
 #define MIN(x, y) ((x < y) ? (x) : (y))
 template <typename T>
 class Vector {
diff --git a/mindspore/lite/micro/cmake/file_list.cmake b/mindspore/lite/micro/cmake/file_list.cmake
index b0a3bccd4cc..cd2447372c5 100644
--- a/mindspore/lite/micro/cmake/file_list.cmake
+++ b/mindspore/lite/micro/cmake/file_list.cmake
@@ -28,8 +28,7 @@ set(CODER_GENERATOR_SRC
         ${MICRO_DIR}/coder/generator/component/const_blocks/debug_utils.cc
         ${MICRO_DIR}/coder/generator/component/const_blocks/msession.cc
         ${MICRO_DIR}/coder/generator/component/const_blocks/mtensor.cc
-        ${MICRO_DIR}/coder/generator/component/const_blocks/mstring.cc
-        ${MICRO_DIR}/coder/generator/component/const_blocks/model.cc
+        ${MICRO_DIR}/coder/generator/component/const_blocks/mmodel.cc
         ${MICRO_DIR}/coder/generator/component/const_blocks/license.cc
         ${MICRO_DIR}/coder/generator/component/const_blocks/load_input.cc
         ${MICRO_DIR}/coder/generator/component/const_blocks/calib_output.cc
diff --git a/mindspore/lite/micro/coder/generator/component/cmake_component.cc b/mindspore/lite/micro/coder/generator/component/cmake_component.cc
index 45aeb163b27..450ba394a4d 100644
--- a/mindspore/lite/micro/coder/generator/component/cmake_component.cc
+++ b/mindspore/lite/micro/coder/generator/component/cmake_component.cc
@@ -34,8 +34,7 @@ void CodeCMakeNetLibrary(std::ofstream &ofs, const std::unique_ptr<CoderContext>
   ofs << "    weight.c.o\n"
       << "    net.c.o\n"
       << "    session.cc.o\n"
-      << "    tensor.cc.o\n"
-      << "    string.cc.o\n";
+      << "    tensor.cc.o\n";
   if (config->debug_mode()) {
     ofs << "    debug_utils.c.o\n";
   }
diff --git a/mindspore/lite/micro/coder/generator/component/const_blocks/model.cc b/mindspore/lite/micro/coder/generator/component/const_blocks/mmodel.cc
similarity index 97%
rename from mindspore/lite/micro/coder/generator/component/const_blocks/model.cc
rename to mindspore/lite/micro/coder/generator/component/const_blocks/mmodel.cc
index 96e92c2defa..5f1341decba 100644
--- a/mindspore/lite/micro/coder/generator/component/const_blocks/model.cc
+++ b/mindspore/lite/micro/coder/generator/component/const_blocks/mmodel.cc
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "coder/generator/component/const_blocks/model.h"
+#include "coder/generator/component/const_blocks/mmodel.h"
 
 namespace mindspore::lite::micro {
 
diff --git a/mindspore/lite/micro/coder/generator/component/const_blocks/model.h b/mindspore/lite/micro/coder/generator/component/const_blocks/mmodel.h
similarity index 100%
rename from mindspore/lite/micro/coder/generator/component/const_blocks/model.h
rename to mindspore/lite/micro/coder/generator/component/const_blocks/mmodel.h
diff --git a/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.cc b/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.cc
deleted file mode 100644
index 87fd824a0c2..00000000000
--- a/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.cc
+++ /dev/null
@@ -1,330 +0,0 @@
-/**
- * Copyright 2021 Huawei Technologies Co., Ltd
- *
- * 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.
- */
-
-#include "coder/generator/component/const_blocks/mstring.h"
-
-namespace mindspore::lite::micro {
-
-const char *string_source = R"RAW(
-
-/**
- * Copyright 2021 Huawei Technologies Co., Ltd
- *
- * 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.
- */
-
-#ifdef NOT_USE_STL
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <float.h>
-#include <stdint.h>
-#include "include/lite_utils.h"
-
-namespace mindspore {
-String::String() {
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  buffer_[0] = '\0';
-  size_ = 0;
-}
-
-String::String(size_t count, char ch) {
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (count + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  memset(buffer_, ch, count);
-  buffer_[count] = '\0';
-  size_ = count;
-}
-String::String(const char *s, size_t count) {
-  if (s == nullptr) {
-    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-    if (buffer_ == nullptr) {
-      MS_C_EXCEPTION("malloc data failed");
-    }
-    buffer_[0] = '\0';
-    size_ = 0;
-    return;
-  }
-  size_t size_s = strlen(s);
-  if (size_s <= count) {
-    size_ = size_s;
-  } else {
-    size_ = count;
-  }
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  strncpy(buffer_, s, size_);
-  buffer_[size_] = '\0';
-}
-
-String::String(const char *s) {
-  if (s == nullptr) {
-    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-    if (buffer_ == nullptr) {
-      MS_C_EXCEPTION("malloc data failed");
-    }
-    buffer_[0] = '\0';
-    size_ = 0;
-    return;
-  }
-  size_ = strlen(s);
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  memcpy(buffer_, s, size_ + 1);
-}
-
-String::String(const String &other) {
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (other.size_ + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  size_ = other.size_;
-  memcpy(buffer_, other.buffer_, size_ + 1);
-}
-
-String::String(const String &other, size_t pos, size_t count) {
-  if (pos >= other.size_) {
-    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-    if (buffer_ == nullptr) {
-      MS_C_EXCEPTION("malloc data failed");
-    }
-    buffer_[0] = '\0';
-    size_ = 0;
-  } else {
-    if (count == npos) {
-      count = other.size_ - pos;
-    }
-    if (pos + count > other.size_) {
-      size_ = other.size_ - pos;
-    } else {
-      size_ = count;
-    }
-    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 1)));
-    if (buffer_ == nullptr) {
-      MS_C_EXCEPTION("malloc data failed");
-    }
-    strncpy(buffer_, other.buffer_ + pos, size_);
-    buffer_[size_] = '\0';
-  }
-}
-
-String::~String() { free(buffer_); }
-
-String &String::operator=(const String &str) {
-  if (this == &str) {
-    return *this;
-  }
-  free(buffer_);
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (str.size_ + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  size_ = str.size_;
-  memcpy(buffer_, str.buffer_, size_ + 1);
-  return *this;
-}
-
-String &String::operator=(const char *str) {
-  free(buffer_);
-  if (str == nullptr) {
-    buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-    if (buffer_ == nullptr) {
-      MS_C_EXCEPTION("malloc data failed");
-    }
-    buffer_[0] = '\0';
-    size_ = 0;
-    return *this;
-  }
-  size_t size_s = strlen(str);
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * (size_s + 1)));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  size_ = size_s;
-  memcpy(buffer_, str, size_ + 1);
-  return *this;
-}
-
-char &String::at(size_t pos) {
-  if (pos >= size_) {
-    MS_C_EXCEPTION("pos out of range");
-  }
-  return buffer_[pos];
-}
-const char &String::at(size_t pos) const {
-  if (pos >= size_) {
-    MS_C_EXCEPTION("pos out of range");
-  }
-  return buffer_[pos];
-}
-char &String::operator[](size_t pos) {
-  if (pos >= size_) {
-    MS_C_EXCEPTION("pos out of range");
-  }
-  return this->at(pos);
-}
-const char &String::operator[](size_t pos) const {
-  if (pos >= size_) {
-    MS_C_EXCEPTION("pos out of range");
-  }
-  return this->at(pos);
-}
-char *String::data() noexcept { return buffer_; };
-const char *String::data() const noexcept { return buffer_; }
-const char *String::c_str() const noexcept { return buffer_; }
-
-// capacity
-bool String::empty() const noexcept { return size_ == 0; }
-size_t String::size() const noexcept { return size_; }
-size_t String::length() const noexcept { return size_; }
-
-// operations
-void String::clear() noexcept {
-  free(buffer_);
-  buffer_ = reinterpret_cast<char *>(malloc(sizeof(char) * 1));
-  if (buffer_ == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  buffer_[0] = '\0';
-  size_ = 0;
-}
-
-String &String::operator+(const String &str) {
-  (*this) += str;
-  return *this;
-}
-
-String &String::operator+=(const String &str) {
-  size_t new_size = size_ + str.size_;
-  char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (new_size + 1)));
-  if (tmp == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  memcpy(tmp, this->buffer_, size_ + 1);
-  strncat(tmp, str.buffer_, str.size_);
-  tmp[new_size] = '\0';
-  free(buffer_);
-  buffer_ = tmp;
-  size_ = new_size;
-  return *this;
-}
-
-String &String::operator+=(const char *str) {
-  if (str == nullptr) {
-    return *this;
-  }
-  size_t str_size = strlen(str);
-  size_t new_size = size_ + str_size;
-  char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (new_size + 1)));
-  if (tmp == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  memcpy(tmp, this->buffer_, size_ + 1);
-  strncat(tmp, str, str_size);
-  tmp[new_size] = '\0';
-  free(buffer_);
-  buffer_ = tmp;
-  size_ = new_size;
-  return *this;
-}
-
-String &String::operator+=(const char ch) {
-  char *tmp = reinterpret_cast<char *>(malloc(sizeof(char) * (size_ + 2)));
-  if (tmp == nullptr) {
-    MS_C_EXCEPTION("malloc data failed");
-  }
-  memcpy(tmp, this->buffer_, size_ + 1);
-  tmp[size_] = ch;
-  tmp[size_ + 1] = '\0';
-  free(buffer_);
-  buffer_ = tmp;
-  size_ += 1;
-  return *this;
-}
-
-String &String::append(size_t count, const char ch) {
-  (*this) += ch;
-  return *this;
-}
-String &String::append(const String &str) {
-  (*this) += str;
-  return *this;
-}
-String &String::append(const char *str) {
-  if (str == nullptr) {
-    return *this;
-  }
-  (*this) += str;
-  return *this;
-}
-
-int String::compare(const String &str) const { return strcmp(buffer_, str.buffer_); }
-int String::compare(const char *str) const { return strcmp(buffer_, str); }
-
-String String::substr(size_t pos, size_t count) const { return String(*this, pos, count); }
-
-String operator+(const String &lhs, const char *rhs) {
-  String str = lhs;
-  str += rhs;
-  return str;
-}
-
-String operator+(const char *lhs, const String &rhs) {
-  String str = rhs;
-  str += lhs;
-  return str;
-}
-
-bool operator!=(const String &lhs, const String &rhs) { return lhs.compare(rhs) != 0; }
-bool operator==(const String &lhs, const String &rhs) { return lhs.compare(rhs) == 0; }
-bool operator==(const String &lhs, const char *rhs) { return lhs.compare(rhs) == 0; }
-bool operator==(const char *lhs, const String &rhs) { return rhs.compare(lhs) == 0; }
-
-String to_String(int32_t value) {
-  char tmp[sizeof(int32_t) * 4];
-  snprintf(tmp, sizeof(int32_t) * 4, "%d", value);
-  return String(tmp, strlen(tmp));
-}
-
-String to_String(float value) {
-  char tmp[FLT_MAX_10_EXP + 20];
-  snprintf(tmp, FLT_MAX_10_EXP + 20, "%f", value);
-  return String(tmp, strlen(tmp));
-}
-}  // namespace mindspore
-#endif  // NOT_USE_STL
-)RAW";
-
-}  // namespace mindspore::lite::micro
diff --git a/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.h b/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.h
deleted file mode 100644
index bf7f0d9ba1f..00000000000
--- a/mindspore/lite/micro/coder/generator/component/const_blocks/mstring.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * Copyright 2021 Huawei Technologies Co., Ltd
- *
- * 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 MINDSPORE_LITE_MICRO_GENERATOR_CONST_BLOCK_MSTRING_H_
-#define MINDSPORE_LITE_MICRO_GENERATOR_CONST_BLOCK_MSTRING_H_
-
-namespace mindspore::lite::micro {
-
-extern const char *string_source;
-
-}  // namespace mindspore::lite::micro
-
-#endif  // MINDSPORE_LITE_MICRO_GENERATOR_CONST_BLOCK_MSTRING_H_
diff --git a/mindspore/lite/micro/coder/generator/generator.cc b/mindspore/lite/micro/coder/generator/generator.cc
index ed7ae28ec37..3be58abd001 100644
--- a/mindspore/lite/micro/coder/generator/generator.cc
+++ b/mindspore/lite/micro/coder/generator/generator.cc
@@ -27,8 +27,7 @@
 #include "coder/generator/component/const_blocks/calib_output.h"
 #include "coder/generator/component/const_blocks/msession.h"
 #include "coder/generator/component/const_blocks/mtensor.h"
-#include "coder/generator/component/const_blocks/mstring.h"
-#include "coder/generator/component/const_blocks/model.h"
+#include "coder/generator/component/const_blocks/mmodel.h"
 #include "coder/generator/component/const_blocks/thread_pool.h"
 #include "coder/generator/component/const_blocks/benchmark.h"
 #include "coder/generator/component/const_blocks/license.h"
@@ -96,8 +95,7 @@ int Generator::CodeStaticContent() {
     {net_src_file_path_ + "session.h", session_header},
     {net_src_file_path_ + "tensor.h", tensor_header},
     {net_src_file_path_ + "tensor.cc", tensor_source},
-    {net_src_file_path_ + "string.cc", string_source},
-    {net_src_file_path_ + "model.h", model_header}};
+    {net_src_file_path_ + "mmodel.h", model_header}};
   if (config_->support_parallel()) {
     const_blocks.emplace_back(std::make_pair(net_src_file_path_ + "thread_pool.h", thread_header));
   }
@@ -120,7 +118,7 @@ int Generator::CodeSessionImplement() {
   MS_LOG(INFO) << "write " << cfile;
   ofs << g_hwLicense;
   ofs << "#include \"session.h\"\n";
-  ofs << "#include \"model.h\"\n";
+  ofs << "#include \"mmodel.h\"\n";
   ofs << "#include \"net.h\"\n";
   ofs << "#include <new>\n\n";
   CodeSessionCompileGraph(ofs, ctx_, config_);