switch NodeAttr to boost::varient (#12539)

Author: Superjomn

paddle/fluid/inference/analysis/CMakeLists.txt

@@ -8,7 +8,7 @@ cc_library(analysis SRCS pass_manager.cc dot.cc node.cc data_flow_graph.cc graph
   helper.cc
         model_store_pass.cc
   DEPS framework_proto proto_desc)
-cc_test(test_node SRCS node_tester.cc DEPS analysis)
+cc_test(test_node SRCS node_tester.cc DEPS analysis gflags glog gtest)
 cc_test(test_dot SRCS dot_tester.cc DEPS analysis)
 cc_binary(inference_analyzer SRCS analyzer_main.cc DEPS analysis)
 

paddle/fluid/inference/analysis/node.cc

@@ -20,17 +20,6 @@ namespace paddle {
 namespace inference {
 namespace analysis {
 
-template <>
-std::string &NodeAttr::As<std::string>() {
-  if (data_.empty()) {
-    type_index_ = std::type_index(typeid(std::string));
-  }
-  PADDLE_ENFORCE_EQ(type_index_, std::type_index(typeid(std::string)));
-  return data_;
-}
-
-std::string &NodeAttr::String() { return As<std::string>(); }
-
 std::vector<Dot::Attr> Value::dot_attrs() const {
   return std::vector<Dot::Attr>({Dot::Attr("style", "filled,rounded"),
                                  Dot::Attr("shape", "box"),

paddle/fluid/inference/analysis/node.h

@@ -29,6 +29,7 @@ limitations under the License. */
 #include "paddle/fluid/inference/analysis/device.h"
 #include "paddle/fluid/inference/analysis/dot.h"
 #include "paddle/fluid/inference/analysis/helper.h"
+#include "paddle/fluid/platform/variant.h"
 
 namespace paddle {
 namespace inference {
@@ -38,39 +39,35 @@ class NodeMap;
 
 // A helper class to maintain the status from Pass.
 struct NodeAttr {
+  using any_t =
+      boost::variant<bool, float, int32_t, int64_t, void *, std::string>;
   // NOTE T should be a primary type or a struct combined by several primary
   // types.
   // NOTE the STL containers should not use here.
   // Some usages
   //   Attr attr;
   //   attr.Bool() = true;
-
   bool &Bool() { return As<bool>(); }
   float &Float() { return As<float>(); }
   int32_t &Int32() { return As<int32_t>(); }
   int64_t &Int64() { return As<int64_t>(); }
   void *&Pointer() { return As<void *>(); }
-  std::string &String();
+  std::string &String() { return As<std::string>(); }
 
  private:
   template <typename T>
   T &As() {
-    // init storage in the first usage.
-    if (data_.empty()) {
-      VLOG(4) << "resize data to " << sizeof(T);
-      type_index_ = std::type_index(typeid(T));
-      data_.resize(sizeof(T));
+    if (type_index_ == typeid(NodeAttr)) {
+      type_index_ = typeid(T);
+      any_data_ = T();
+    } else {
+      PADDLE_ENFORCE(type_index_ == typeid(T), "fetch error type");
     }
-    PADDLE_ENFORCE(framework::IsType<T>(type_index_),
-                   "type not matched, origin is %s, want %s",
-                   DataTypeNamer::Global().repr(type_index_),
-                   DataTypeNamer::Global().repr<T>());
-    PADDLE_ENFORCE_EQ(data_.size(), sizeof(T), "Node attr type recast error");
-    return *reinterpret_cast<T *>(&data_[0]);
+    return boost::get<T>(any_data_);
   }
 
  private:
-  std::string data_;
+  any_t any_data_;
   std::type_index type_index_{typeid(NodeAttr)};
 };
 

paddle/fluid/inference/analysis/node_tester.cc

@@ -20,13 +20,34 @@ namespace paddle {
 namespace inference {
 namespace analysis {
 
+TEST(NodeAttr, bool) {
+  NodeAttr x;
+  x.Bool() = true;
+  ASSERT_EQ(x.Bool(), true);
+}
+
+TEST(NodeAttr, int32) {
+  NodeAttr x;
+  x.Int32() = 32;
+  ASSERT_EQ(x.Int32(), 32);
+}
+
+TEST(NodeAttr, string) {
+  NodeAttr x;
+  x.String() = "Hello";
+  ASSERT_EQ(x.String(), "Hello");
+}
+
 TEST(Node, Attr) {
   // Node is an abstract class, use Value instead for they share the same Attr
   // logic.
   NodeMap nodes;
   auto* node = nodes.Create(Node::Type::kValue);
   node->attr("v0").Int32() = 2008;
   ASSERT_EQ(node->attr("v0").Int32(), 2008);
+
+  node->attr("str").String() = "hello world";
+  ASSERT_EQ(node->attr("str").String(), "hello world");
 }
 
 }  // namespace analysis