1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 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 class ValueTypeBaseNode : public TypeNode { 34 protected: 35 ValueTypeBaseNode(const Type* t, int nb_fields) 36 : TypeNode(t, nb_fields) { 37 init_class_id(Class_ValueTypeBase); 38 } 39 40 enum { Control, // Control input 41 Oop, // Oop of TypeValueTypePtr 42 Values // Nodes corresponding to values of the value type's fields. 43 // Nodes are connected in increasing order of the index of the field 44 // they correspond to. Field indeces are defined in ciValueKlass::_field_index_map. 45 }; 46 47 virtual const TypeValueTypePtr* value_type_ptr() const = 0; 48 // Get the klass defining the field layout of the value type 49 50 virtual ciValueKlass* value_klass() const = 0; 51 public: 52 // Support for control flow merges 53 bool has_phi_inputs(Node* region); 54 ValueTypeBaseNode* clone_with_phis(PhaseGVN* gvn, Node* region); 55 ValueTypeBaseNode* merge_with(PhaseGVN* gvn, const ValueTypeBaseNode* other, int pnum, bool transform); 56 57 // Get oop for heap allocated value type (may be TypePtr::NULL_PTR) 58 Node* get_oop() const { return in(Oop); } 59 void set_oop(Node* oop) { set_req(Oop, oop); } 60 61 // Value type fields 62 uint field_count() const { return req() - Values; } 63 Node* field_value(uint index) const; 64 Node* field_value_by_offset(int offset, bool recursive = false) const; 65 void set_field_value(uint index, Node* value); 66 int field_offset(uint index) const; 67 ciType* field_type(uint index) const; 68 69 int make_scalar_in_safepoint(SafePointNode* sfpt, Node* root, PhaseGVN* gvn); 70 }; 71 72 //------------------------------ValueTypeNode------------------------------------- 73 // Node representing a value type in C2 IR 74 class ValueTypeNode : public ValueTypeBaseNode { 75 friend class ValueTypeBaseNode; 76 private: 77 ValueTypeNode(const TypeValueType* t, Node* oop) 78 : ValueTypeBaseNode(t, Values + t->value_klass()->nof_declared_nonstatic_fields()) { 79 init_class_id(Class_ValueType); 80 init_req(Oop, oop); 81 } 82 83 ValueTypeNode(const TypeValueType* t, Node* oop, int field_count) 84 : ValueTypeBaseNode(t, Values + field_count) { 85 init_class_id(Class_ValueType); 86 init_req(Oop, oop); 87 } 88 89 // Initialize the value type by loading its field values from memory 90 void load(PhaseGVN& gvn, Node* mem, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0); 91 // Checks if the value type is loaded from memory and if so returns the oop 92 Node* is_loaded(PhaseGVN* phase, const TypeValueType* t, Node* base = NULL, int holder_offset = 0); 93 94 const TypeValueTypePtr* value_type_ptr() const { return TypeValueTypePtr::make(bottom_type()->isa_valuetype()); } 95 // Get the klass defining the field layout of the value type 96 ciValueKlass* value_klass() const { return type()->is_valuetype()->value_klass(); } 97 98 public: 99 // Create a new ValueTypeNode with uninitialized values 100 static ValueTypeNode* make(PhaseGVN& gvn, ciValueKlass* klass); 101 // Create a new ValueTypeNode with default values 102 static Node* make_default(PhaseGVN& gvn, ciValueKlass* vk); 103 // Create a new ValueTypeNode and load its values from an oop 104 static Node* make(PhaseGVN& gvn, Node* mem, Node* oop); 105 // Create a new ValueTypeNode and load its values from a flattened value type field or array 106 static Node* make(PhaseGVN& gvn, ciValueKlass* vk, Node* mem, Node* obj, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0); 107 108 109 // Store the value type as a flattened (headerless) representation 110 void store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0) const; 111 // Store the field values to memory 112 void store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0) const; 113 114 // Allocates the value type (if not yet allocated) and returns the oop 115 Node* allocate(GraphKit* kit); 116 bool is_allocated(PhaseGVN* phase) const; 117 118 // Replace ValueTypeNodes in debug info at safepoints with SafePointScalarObjectNodes 119 void make_scalar_in_safepoints(Compile* C); 120 void pass_klass(Node* n, uint pos, const GraphKit& kit); 121 uint pass_fields(Node* call, int base_input, const GraphKit& kit, ciValueKlass* base_vk = NULL, int base_offset = 0); 122 void replace_call_results(Node* call, Compile* C); 123 124 // Allocation optimizations 125 void remove_redundant_allocations(PhaseIterGVN* igvn, PhaseIdealLoop* phase); 126 127 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape); 128 virtual int Opcode() const; 129 130 #ifndef PRODUCT 131 virtual void dump_spec(outputStream* st) const; 132 #endif 133 }; 134 135 class ValueTypePtrNode : public ValueTypeBaseNode { 136 private: 137 ciValueKlass* value_klass() const { return type()->is_valuetypeptr()->value_type()->value_klass(); } 138 const TypeValueTypePtr* value_type_ptr() const { return bottom_type()->isa_valuetypeptr(); } 139 public: 140 141 ValueTypePtrNode(ValueTypeNode* vt, Node* oop) 142 : ValueTypeBaseNode(TypeValueTypePtr::make(vt->type()->is_valuetype())->cast_to_ptr_type(TypePtr::NotNull), vt->req()) { 143 for (uint i = Oop+1; i < vt->req(); i++) { 144 init_req(i, vt->in(i)); 145 } 146 init_req(Oop, oop); 147 } 148 149 virtual int Opcode() const; 150 }; 151 152 #endif // SHARE_VM_OPTO_VALUETYPENODE_HPP