18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OPTO_VALUETYPENODE_HPP
  26 #define SHARE_VM_OPTO_VALUETYPENODE_HPP
  27 
  28 #include "opto/node.hpp"
  29 #include "opto/connode.hpp"
  30 
  31 class GraphKit;
  32 
  33 //------------------------------ValueTypeNode-------------------------------------
  34 // Node representing a value type in C2 IR
  35 class ValueTypeNode : public TypeNode {
  36 private:
  37   ValueTypeNode(const TypeValueType* t, Node* oop)
  38     : TypeNode(t, Values + t->value_klass()->param_count()) {
  39     init_class_id(Class_ValueType);
  40     init_req(Oop, oop);
  41   }
  42 
  43   // Get the klass defining the field layout of the value type
  44   ciValueKlass* get_value_klass() const { return type()->is_valuetype()->value_klass(); }
  45   // Initialize the value type by loading its field values from memory
  46   void load_values(PhaseGVN& gvn, Node* mem, ciInstanceKlass* holder, Node* base, int base_offset = 0);
  47   // Store the field values to memory
  48   void store_values(GraphKit* kit, ciInstanceKlass* holder, Node* base, int base_offset = 0) const;
  49 
  50   enum { Control,   // Control input
  51          Oop,       // Oop of TypeValueTypePtr
  52          Values     // Nodes corresponding to field values


  53   };
  54 
  55 public:
  56   // Create a new ValueTypeNode with uninitialized values
  57   static Node* make(PhaseGVN& gvn, ciValueKlass* klass);
  58   // Create a new ValueTypeNode and load its values from an oop
  59   static Node* make(PhaseGVN& gvn, Node* mem, Node* oop);
  60   // Create a new ValueTypeNode and load its values from a flattened value type field
  61   static Node* make(PhaseGVN& gvn, ciValueKlass* klass, Node* mem, ciInstanceKlass* holder, Node* obj, int field_offset);
  62 
  63   // Support for control flow merges
  64   ValueTypeNode* clone_with_phis(PhaseGVN& gvn, Node* region);
  65   Node* merge_with(GraphKit* kit, const ValueTypeNode* other, int pnum);
  66 
  67   // Store the value type to memory if not yet allocated and returns the oop
  68   Node* store_to_memory(GraphKit* kit);
  69   // Store the value type in a field of an object
  70   void store_to_field(GraphKit* kit, ciInstanceKlass* holder, Node* obj, int field_offset) const;
  71 
  72   // Get oop for heap allocated value type (may be TypePtr::NULL_PTR)

  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OPTO_VALUETYPENODE_HPP
  26 #define SHARE_VM_OPTO_VALUETYPENODE_HPP
  27 
  28 #include "opto/node.hpp"
  29 #include "opto/connode.hpp"
  30 
  31 class GraphKit;
  32 
  33 //------------------------------ValueTypeNode-------------------------------------
  34 // Node representing a value type in C2 IR
  35 class ValueTypeNode : public TypeNode {
  36 private:
  37   ValueTypeNode(const TypeValueType* t, Node* oop)
  38     : TypeNode(t, Values + t->value_klass()->nof_declared_nonstatic_fields()) {
  39     init_class_id(Class_ValueType);
  40     init_req(Oop, oop);
  41   }
  42 
  43   // Get the klass defining the field layout of the value type
  44   ciValueKlass* get_value_klass() const { return type()->is_valuetype()->value_klass(); }
  45   // Initialize the value type by loading its field values from memory
  46   void load_values(PhaseGVN& gvn, Node* mem, ciInstanceKlass* holder, Node* base, int base_offset = 0);
  47   // Store the field values to memory
  48   void store_values(GraphKit* kit, ciInstanceKlass* holder, Node* base, int base_offset = 0) const;
  49 
  50   enum { Control,   // Control input
  51          Oop,       // Oop of TypeValueTypePtr
  52          Values     // Nodes corresponding to field values
  53                     // Field values are connected in increasing order of the index of their VM-internal field
  54                     // representation (the index returned by fieldDescriptor::index() for a field).
  55   };
  56 
  57 public:
  58   // Create a new ValueTypeNode with uninitialized values
  59   static Node* make(PhaseGVN& gvn, ciValueKlass* klass);
  60   // Create a new ValueTypeNode and load its values from an oop
  61   static Node* make(PhaseGVN& gvn, Node* mem, Node* oop);
  62   // Create a new ValueTypeNode and load its values from a flattened value type field
  63   static Node* make(PhaseGVN& gvn, ciValueKlass* klass, Node* mem, ciInstanceKlass* holder, Node* obj, int field_offset);
  64 
  65   // Support for control flow merges
  66   ValueTypeNode* clone_with_phis(PhaseGVN& gvn, Node* region);
  67   Node* merge_with(GraphKit* kit, const ValueTypeNode* other, int pnum);
  68 
  69   // Store the value type to memory if not yet allocated and returns the oop
  70   Node* store_to_memory(GraphKit* kit);
  71   // Store the value type in a field of an object
  72   void store_to_field(GraphKit* kit, ciInstanceKlass* holder, Node* obj, int field_offset) const;
  73 
  74   // Get oop for heap allocated value type (may be TypePtr::NULL_PTR)