Merge pull request #9975 from reyoung/feature/VarHandleCtor

Using constructor for VarHandle

paddle/fluid/framework/details/broadcast_op_handle_test.cc

@@ -77,14 +77,9 @@ struct TestBroadcastOpHandle {
     local_scopes_[input_scope_idx]->Var("input");
 
     op_handle_.reset(new BroadcastOpHandle(local_scopes_, gpu_list_));
-
-    vars_.emplace_back(new VarHandle());
-    VarHandle* in_var_handle = static_cast<VarHandle*>(vars_.back().get());
-    in_var_handle->place_ = gpu_list_[input_scope_idx];
-    in_var_handle->name_ = "input";
-    in_var_handle->version_ = 1;
-    in_var_handle->scope_idx_ = input_scope_idx;
-    in_var_handle->generated_op_ = nullptr;
+    auto* in_var_handle =
+        new VarHandle(1, input_scope_idx, "input", gpu_list_[input_scope_idx]);
+    vars_.emplace_back(in_var_handle);
     op_handle_->AddInput(in_var_handle);
 
     // add dummy var
@@ -96,12 +91,8 @@ struct TestBroadcastOpHandle {
 
     for (size_t j = 0; j < gpu_list_.size(); ++j) {
       op_handle_->dev_ctxes_[gpu_list_[j]] = ctxs_[j].get();
-      vars_.emplace_back(new VarHandle());
-      VarHandle* out_var_handle = static_cast<VarHandle*>(vars_.back().get());
-      out_var_handle->place_ = gpu_list_[j];
-      out_var_handle->name_ = "out";
-      out_var_handle->version_ = 2;
-      out_var_handle->scope_idx_ = j;
+      VarHandle* out_var_handle = new VarHandle(2, j, "out", gpu_list_[j]);
+      vars_.emplace_back(out_var_handle);
       op_handle_->AddOutput(out_var_handle);
     }
 

paddle/fluid/framework/details/gather_op_handle_test.cc

@@ -79,13 +79,8 @@ struct TestGatherOpHandle {
     // add input
     for (size_t j = 0; j < gpu_list_.size(); ++j) {
       op_handle_->dev_ctxes_[gpu_list_[j]] = ctxs_[j].get();
-      vars_.emplace_back(new VarHandle());
-      VarHandle* in_var_handle = static_cast<VarHandle*>(vars_.back().get());
-      in_var_handle->place_ = gpu_list_[j];
-      in_var_handle->name_ = "input";
-      in_var_handle->version_ = 1;
-      in_var_handle->scope_idx_ = j;
-      in_var_handle->generated_op_ = nullptr;
+      auto* in_var_handle = new VarHandle(1, j, "input", gpu_list_[j]);
+      vars_.emplace_back(in_var_handle);
       op_handle_->AddInput(in_var_handle);
     }
 
@@ -97,12 +92,9 @@ struct TestGatherOpHandle {
     op_handle_->AddInput(in_dummy_var_handle);
 
     // add output
-    vars_.emplace_back(new VarHandle());
-    VarHandle* out_var_handle = static_cast<VarHandle*>(vars_.back().get());
-    out_var_handle->place_ = gpu_list_[input_scope_idx];
-    out_var_handle->name_ = "out";
-    out_var_handle->version_ = 2;
-    out_var_handle->scope_idx_ = input_scope_idx;
+    auto* out_var_handle =
+        new VarHandle(2, input_scope_idx, "out", gpu_list_[input_scope_idx]);
+    vars_.emplace_back(out_var_handle);
     op_handle_->AddOutput(out_var_handle);
 
     // add dummy var

paddle/fluid/framework/details/multi_devices_graph_builder.cc

@@ -177,13 +177,9 @@ std::unique_ptr<SSAGraph> MultiDevSSAGraphBuilder::Build(
             auto &prev_grad = vars[vars.size() - 1];
             op_handle->AddInput(prev_grad.get());
 
-            vars.emplace_back(new VarHandle);
-            auto &var = vars.back();
-            var->place_ = p;
-            var->name_ = og;
-            var->version_ = vars.size() - 1;
-
-            op_handle->AddOutput(var.get());
+            auto var = new VarHandle(vars.size() - 1, i, og, p);
+            vars.emplace_back(var);
+            op_handle->AddOutput(var);
           }
 #else
           PADDLE_ENFORCE("Not implemented");

paddle/fluid/framework/details/ssa_graph_builder.cc

@@ -54,13 +54,8 @@ VarHandle *SSAGraphBuilder::CreateOrGetLatestVarHandle(
   auto &var_holder = var_holders[each_var_name];
   VarHandle *var = nullptr;
   if (var_holder.empty()) {
-    var_holder.emplace_back(new VarHandle);
-    auto &init_var = var_holder[0];
-    init_var->place_ = place;
-    init_var->name_ = each_var_name;
-    init_var->generated_op_ = nullptr;
-    init_var->version_ = 0;
-    var = init_var.get();
+    var = new VarHandle(0, place_offset, each_var_name, place);
+    var_holder.emplace_back(var);
   } else {
     var = var_holder.rbegin()->get();
   }
@@ -73,12 +68,9 @@ void SSAGraphBuilder::CreateOpOutput(SSAGraph *graph, OpHandleBase *op_handle,
                                      size_t place_offset) {
   auto &vars = graph->vars_[place_offset][each_var_name];
   size_t version = vars.size();
-  vars.emplace_back(new VarHandle());
-  auto &var = vars.back();
-  var->version_ = version;
-  var->name_ = each_var_name;
-  var->place_ = place;
-  op_handle->AddOutput(var.get());
+  auto var = new VarHandle(version, place_offset, each_var_name, place);
+  vars.emplace_back(var);
+  op_handle->AddOutput(var);
 }
 
 template <typename Callback>

paddle/fluid/framework/details/var_handle.h

@@ -16,6 +16,7 @@
 #include <sstream>
 #include <string>
 #include <unordered_set>
+#include <utility>
 
 #include "paddle/fluid/platform/place.h"
 
@@ -33,10 +34,10 @@ struct VarHandleBase {
 
   // The operator who generate this variable. nullptr if the variable
   // is a root node.
-  OpHandleBase *generated_op_;
+  OpHandleBase* generated_op_{nullptr};
 
   // Operators which depend on this variable ready.
-  std::unordered_set<OpHandleBase *> pending_ops_;
+  std::unordered_set<OpHandleBase*> pending_ops_;
 };
 
 // VarHandle is actually a single version of Runtime Variable.
@@ -47,6 +48,13 @@ struct VarHandleBase {
 struct VarHandle : public VarHandleBase {
   std::string DebugString() const override;
 
+  VarHandle(size_t version, size_t scope_index, std::string name,
+            platform::Place place)
+      : version_(version),
+        scope_idx_(scope_index),
+        name_(std::move(name)),
+        place_(std::move(place)) {}
+
   // version field currently is not used, however, just store the version to
   // debug easily.
   size_t version_;