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 Compile::current()->add_value_type(this); 39 } 40 41 enum { Control, // Control input 42 Oop, // Oop of TypeInstPtr 43 Values // Nodes corresponding to values of the value type's fields. 44 // Nodes are connected in increasing order of the index of the field they correspond to. 45 }; 46 47 virtual const TypeInstPtr* value_ptr() const = 0; 48 // Get the klass defining the field layout of the value type 49 virtual ciValueKlass* value_klass() const = 0; 50 51 int make_scalar_in_safepoint(Unique_Node_List& worklist, SafePointNode* sfpt, Node* root, PhaseGVN* gvn); 52 53 // Initialize the value type fields with the inputs or outputs of a MultiNode 54 void initialize(GraphKit* kit, MultiNode* multi, ciValueKlass* vk, int base_offset = 0, int base_input = TypeFunc::Parms+1, bool in = false); 55 56 const TypePtr* field_adr_type(Node* base, int offset, ciInstanceKlass* holder, PhaseGVN& gvn) const; 57 58 public: 59 // Support for control flow merges 60 bool has_phi_inputs(Node* region); 61 ValueTypeBaseNode* clone_with_phis(PhaseGVN* gvn, Node* region); 62 ValueTypeBaseNode* merge_with(PhaseGVN* gvn, const ValueTypeBaseNode* other, int pnum, bool transform); 63 void add_new_path(Node* region); 64 65 // Get oop for heap allocated value type (may be TypePtr::NULL_PTR) 66 Node* get_oop() const { return in(Oop); } 67 void set_oop(Node* oop) { set_req(Oop, oop); } 68 69 // Value type fields 70 uint field_count() const { return req() - Values; } 71 Node* field_value(uint index) const; 72 Node* field_value_by_offset(int offset, bool recursive = false) const; 73 void set_field_value(uint index, Node* value); 74 void set_field_value_by_offset(int offset, Node* value); 75 int field_offset(uint index) const; 76 ciType* field_type(uint index) const; 77 bool field_is_flattened(uint index) const; 78 bool field_is_flattenable(uint index) const; 79 80 // Replace ValueTypeNodes in debug info at safepoints with SafePointScalarObjectNodes 81 void make_scalar_in_safepoints(Node* root, PhaseGVN* gvn); 82 83 // Store the value type as a flattened (headerless) representation 84 void store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0) const; 85 // Store the field values to memory 86 void store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0, bool deoptimize_on_exception = false) const; 87 // Initialize the value type by loading its field values from memory 88 void load(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0); 89 90 // Allocates the value type (if not yet allocated) 91 ValueTypeBaseNode* allocate(GraphKit* kit, bool deoptimize_on_exception = false); 92 bool is_allocated(PhaseGVN* phase) const; 93 94 void replace_call_results(GraphKit* kit, Node* call, Compile* C); 95 }; 96 97 //------------------------------ValueTypeNode------------------------------------- 98 // Node representing a value type in C2 IR 99 class ValueTypeNode : public ValueTypeBaseNode { 100 friend class ValueTypeBaseNode; 101 friend class ValueTypePtrNode; 102 private: 103 ValueTypeNode(ciValueKlass* vk, Node* oop) 104 : ValueTypeBaseNode(TypeValueType::make(vk), Values + vk->nof_declared_nonstatic_fields()) { 105 init_class_id(Class_ValueType); 106 init_req(Oop, oop); 107 } 108 109 // Checks if the value type is loaded from memory and if so returns the oop 110 Node* is_loaded(PhaseGVN* phase, ciValueKlass* vk = NULL, Node* base = NULL, int holder_offset = 0); 111 112 // Checks if the value type fields are all set to default values 113 bool is_default(PhaseGVN& gvn) const; 114 115 const TypeInstPtr* value_ptr() const { return TypeInstPtr::make(TypePtr::BotPTR, value_klass()); } 116 ciValueKlass* value_klass() const { return type()->is_valuetype()->value_klass(); } 117 118 public: 119 // Create uninitialized 120 static ValueTypeNode* make_uninitialized(PhaseGVN& gvn, ciValueKlass* vk); 121 // Create with default field values 122 static ValueTypeNode* make_default(PhaseGVN& gvn, ciValueKlass* vk); 123 // Create and initialize by loading the field values from an oop 124 static ValueTypeNode* make_from_oop(GraphKit* kit, Node* oop, ciValueKlass* vk); 125 // Create and initialize by loading the field values from a flattened field or array 126 static ValueTypeNode* make_from_flattened(GraphKit* kit, ciValueKlass* vk, Node* obj, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0); 127 // Create and initialize with the inputs or outputs of a MultiNode (method entry or call) 128 static ValueTypeNode* make_from_multi(GraphKit* kit, MultiNode* multi, ciValueKlass* vk, int base_input, bool in); 129 130 // Returns the constant oop of the default value type allocation 131 static Node* default_oop(PhaseGVN& gvn, ciValueKlass* vk); 132 133 // Allocate all non-flattened value type fields 134 Node* allocate_fields(GraphKit* kit); 135 136 Node* tagged_klass(PhaseGVN& gvn); 137 void pass_klass(Node* n, uint pos, const GraphKit& kit); 138 uint pass_fields(Node* call, int base_input, GraphKit& kit, bool assert_allocated = false, ciValueKlass* base_vk = NULL, int base_offset = 0); 139 140 // Allocation optimizations 141 void remove_redundant_allocations(PhaseIterGVN* igvn, PhaseIdealLoop* phase); 142 143 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape); 144 virtual int Opcode() const; 145 }; 146 147 //------------------------------ValueTypePtrNode------------------------------------- 148 // Node representing a value type as a pointer in C2 IR 149 class ValueTypePtrNode : public ValueTypeBaseNode { 150 private: 151 const TypeInstPtr* value_ptr() const { return type()->isa_instptr(); } 152 ciValueKlass* value_klass() const { return value_ptr()->value_klass(); } 153 154 ValueTypePtrNode(ciValueKlass* vk, Node* oop) 155 : ValueTypeBaseNode(TypeInstPtr::make(TypePtr::NotNull, vk), Values + vk->nof_declared_nonstatic_fields()) { 156 init_class_id(Class_ValueTypePtr); 157 init_req(Oop, oop); 158 } 159 160 public: 161 // Create and initialize with the values of a ValueTypeNode 162 static ValueTypePtrNode* make_from_value_type(GraphKit* kit, ValueTypeNode* vt, bool deoptimize_on_exception = false); 163 // Create and initialize by loading the field values from an oop 164 static ValueTypePtrNode* make_from_oop(GraphKit* kit, Node* oop); 165 166 virtual int Opcode() const; 167 }; 168 169 #endif // SHARE_VM_OPTO_VALUETYPENODE_HPP