[turbofan] Put StructuredGraphBuilder out of its misery and merge its remnants back into the AstGra…

src/compiler/graph-builder.h

Index: src/compiler/graph-builder.h
diff --git a/src/compiler/graph-builder.h b/src/compiler/graph-builder.h
index 8374675ab62f9ea5b842a87a3cf4e301cad95d8b..947c576d020da45db7e9720d538377d709aab4ed 100644
--- a/src/compiler/graph-builder.h
+++ b/src/compiler/graph-builder.h
@@ -15,13 +15,8 @@
 
 namespace v8 {
 namespace internal {
-
-class BitVector;
-
 namespace compiler {
 
-class Node;
-
 // A common base class for anything that creates nodes in a graph.
 class GraphBuilder {
  public:
@@ -82,168 +77,6 @@ class GraphBuilder {
   Graph* graph_;
 };
 
-
-// The StructuredGraphBuilder produces a high-level IR graph. It is used as the
-// base class for concrete implementations (e.g the AstGraphBuilder or the
-// StubGraphBuilder).
-class StructuredGraphBuilder : public GraphBuilder {
- public:
-  StructuredGraphBuilder(Isolate* isolate, Zone* zone, Graph* graph,
-                         CommonOperatorBuilder* common);
-  ~StructuredGraphBuilder() OVERRIDE {}
-
-  // Creates a new Phi node having {count} input values.
-  Node* NewPhi(int count, Node* input, Node* control);
-  Node* NewEffectPhi(int count, Node* input, Node* control);
-
-  // Helpers for merging control, effect or value dependencies.
-  Node* MergeControl(Node* control, Node* other);
-  Node* MergeEffect(Node* value, Node* other, Node* control);
-  Node* MergeValue(Node* value, Node* other, Node* control);
-
-  // Helpers to create new control nodes.
-  Node* NewIfTrue() { return NewNode(common()->IfTrue()); }
-  Node* NewIfFalse() { return NewNode(common()->IfFalse()); }
-  Node* NewMerge() { return NewNode(common()->Merge(1), true); }
-  Node* NewLoop() { return NewNode(common()->Loop(1), true); }
-  Node* NewBranch(Node* condition, BranchHint hint = BranchHint::kNone) {
-    return NewNode(common()->Branch(hint), condition);
-  }
-
- protected:
-  class Environment;
-  friend class Environment;
-  friend class ControlBuilder;
-
-  // The following method creates a new node having the specified operator and
-  // ensures effect and control dependencies are wired up. The dependencies
-  // tracked by the environment might be mutated.
-  Node* MakeNode(const Operator* op, int value_input_count, Node** value_inputs,
-                 bool incomplete) FINAL;
-
-  Environment* environment() const { return environment_; }
-  void set_environment(Environment* env) { environment_ = env; }
-
-  Node* current_context() const { return current_context_; }
-  void set_current_context(Node* context) { current_context_ = context; }
-
-  Node* exit_control() const { return exit_control_; }
-  void set_exit_control(Node* node) { exit_control_ = node; }
-
-  Node* dead_control();
-
-  Zone* graph_zone() const { return graph()->zone(); }
-  Zone* local_zone() const { return local_zone_; }
-  CommonOperatorBuilder* common() const { return common_; }
-
-  // Helper to wrap a Handle<T> into a Unique<T>.
-  template <class T>
-  Unique<T> MakeUnique(Handle<T> object) {
-    return Unique<T>::CreateUninitialized(object);
-  }
-
-  // Support for control flow builders. The concrete type of the environment
-  // depends on the graph builder, but environments themselves are not virtual.
-  virtual Environment* CopyEnvironment(Environment* env);
-
-  // Helper to indicate a node exits the function body.
-  void UpdateControlDependencyToLeaveFunction(Node* exit);
-
- private:
-  CommonOperatorBuilder* common_;
-  Environment* environment_;
-
-  // Zone local to the builder for data not leaking into the graph.
-  Zone* local_zone_;
-
-  // Temporary storage for building node input lists.
-  int input_buffer_size_;
-  Node** input_buffer_;
-
-  // Node representing the control dependency for dead code.
-  SetOncePointer<Node> dead_control_;
-
-  // Node representing the current context within the function body.
-  Node* current_context_;
-
-  // Merge of all control nodes that exit the function body.
-  Node* exit_control_;
-
-  // Growth increment for the temporary buffer used to construct input lists to
-  // new nodes.
-  static const int kInputBufferSizeIncrement = 64;
-
-  Node** EnsureInputBufferSize(int size);
-
-  DISALLOW_COPY_AND_ASSIGN(StructuredGraphBuilder);
-};
-
-
-// The abstract execution environment contains static knowledge about
-// execution state at arbitrary control-flow points. It allows for
-// simulation of the control-flow at compile time.
-class StructuredGraphBuilder::Environment : public ZoneObject {
- public:
-  Environment(StructuredGraphBuilder* builder, Node* control_dependency);
-  Environment(const Environment& copy);
-
-  // Control dependency tracked by this environment.
-  Node* GetControlDependency() { return control_dependency_; }
-  void UpdateControlDependency(Node* dependency) {
-    control_dependency_ = dependency;
-  }
-
-  // Effect dependency tracked by this environment.
-  Node* GetEffectDependency() { return effect_dependency_; }
-  void UpdateEffectDependency(Node* dependency) {
-    effect_dependency_ = dependency;
-  }
-
-  // Mark this environment as being unreachable.
-  void MarkAsUnreachable() {
-    UpdateControlDependency(builder()->dead_control());
-  }
-  bool IsMarkedAsUnreachable() {
-    return GetControlDependency()->opcode() == IrOpcode::kDead;
-  }
-
-  // Merge another environment into this one.
-  void Merge(Environment* other);
-
-  // Copies this environment at a control-flow split point.
-  Environment* CopyForConditional() { return builder()->CopyEnvironment(this); }
-
-  // Copies this environment to a potentially unreachable control-flow point.
-  Environment* CopyAsUnreachable() {
-    Environment* env = builder()->CopyEnvironment(this);
-    env->MarkAsUnreachable();
-    return env;
-  }
-
-  // Copies this environment at a loop header control-flow point.
-  Environment* CopyForLoop(BitVector* assigned, bool is_osr = false) {
-    PrepareForLoop(assigned, is_osr);
-    return builder()->CopyEnvironment(this);
-  }
-
-  Node* GetContext() { return builder_->current_context(); }
-
- protected:
-  Zone* zone() const { return builder_->local_zone(); }
-  Graph* graph() const { return builder_->graph(); }
-  StructuredGraphBuilder* builder() const { return builder_; }
-  CommonOperatorBuilder* common() { return builder_->common(); }
-  NodeVector* values() { return &values_; }
-
-  // Prepare environment to be used as loop header.
-  void PrepareForLoop(BitVector* assigned, bool is_osr = false);
-
- private:
-  StructuredGraphBuilder* builder_;
-  Node* control_dependency_;
-  Node* effect_dependency_;
-  NodeVector values_;
-};
 }
 }
 }  // namespace v8::internal::compiler