Merge pull request #2646 from reyoung/feature/add_enforce

Adding Enforce to platform

paddle/framework/CMakeLists.txt

 cc_library(ddim SRCS ddim.cc)
 cc_test(ddim_test SRCS ddim_test.cc DEPS ddim)
-
 nv_test(dim_test SRCS dim_test.cu DEPS ddim)
-
 cc_test(variable_test SRCS variable_test.cc)
+cc_test(enforce_test SRCS enforce_test.cc)

paddle/framework/enforce.h

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+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. */
+
+#pragma once
+#include <paddle/string/printf.h>
+#include <exception>
+#include <sstream>
+
+namespace paddle {
+namespace framework {
+
+/**
+ * @brief Enforce exception. Inherits std::exception
+ *
+ * All enforce condition not met, will throw an EnforceNotMet exception.
+ */
+class EnforceNotMet : public std::exception {
+ public:
+  EnforceNotMet(const std::string& msg, const char* file, int fileline) {
+    std::ostringstream sout;
+    sout << msg << " at [" << file << ":" << fileline << "];";
+    all_msg_ = sout.str();
+  }
+
+  const char* what() const noexcept override { return all_msg_.c_str(); }
+
+ private:
+  std::string all_msg_;
+};
+
+// From https://stackoverflow.com/questions/30130930/
+// __buildin_expect is in C++ 11 standard. Since the condition which enforced
+// should be true in most situation, it will make the compiler generate faster
+// code by adding `UNLIKELY` macro.
+#define UNLIKELY(condition) __builtin_expect(static_cast<bool>(condition), 0)
+
+/**
+ * @brief Throw a EnforceNotMet exception, automatically filled __FILE__ &
+ * __LINE__
+ *
+ * This macro take __VA_ARGS__, user can pass any type if that type can
+ * serialize to std::ostream
+ */
+#define PADDLE_THROW(...)                                            \
+  do {                                                               \
+    throw ::paddle::framework::EnforceNotMet(                        \
+        ::paddle::string::Sprintf(__VA_ARGS__), __FILE__, __LINE__); \
+  } while (0)
+
+/**
+ * @brief Enforce a condition, otherwise throw an EnforceNotMet
+ */
+#define PADDLE_ENFORCE(condition, ...) \
+  do {                                 \
+    if (UNLIKELY(!(condition))) {      \
+      PADDLE_THROW(__VA_ARGS__);       \
+    }                                  \
+  } while (0)
+
+}  // namespace framework
+}  // namespace paddle

paddle/framework/enforce_test.cc

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+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 <gtest/gtest.h>
+#include <paddle/framework/enforce.h>
+
+TEST(ENFORCE, OK) {
+  PADDLE_ENFORCE(true, "Enforce is ok %d now %f", 123, 0.345);
+  size_t val = 1;
+  const size_t limit = 10;
+  PADDLE_ENFORCE(val < limit, "Enforce is OK too");
+}
+
+TEST(ENFORCE, FAILED) {
+  bool in_catch = false;
+  try {
+    PADDLE_ENFORCE(false, "Enforce is not ok %d at all", 123);
+  } catch (paddle::framework::EnforceNotMet err) {
+    in_catch = true;
+    std::string msg = "Enforce is not ok 123 at all";
+    const char* what = err.what();
+    for (size_t i = 0; i < msg.length(); ++i) {
+      ASSERT_EQ(what[i], msg[i]);
+    }
+  }
+  ASSERT_TRUE(in_catch);
+}
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