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 //------------------------------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 ValueTypeNode(const TypeValueType* t, Node* oop, int field_count) 44 : TypeNode(t, Values + field_count) { 45 init_class_id(Class_ValueType); 46 init_req(Oop, oop); 47 } 48 49 // Get the klass defining the field layout of the value type 50 ciValueKlass* value_klass() const { return type()->is_valuetype()->value_klass(); } 51 // Initialize the value type by loading its field values from memory 52 void load(PhaseGVN& gvn, Node* mem, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0); 53 // Checks if the value type is loaded from memory and if so returns the oop 54 Node* is_loaded(PhaseGVN* phase, const TypeValueType* t, Node* base = NULL, int holder_offset = 0); 55 56 enum { Control, // Control input 57 Oop, // Oop of TypeValueTypePtr 58 Values // Nodes corresponding to values of the value type's fields. 59 // Nodes are connected in increasing order of the index of the field 60 // they correspond to. Field indeces are defined in ciValueKlass::_field_index_map. 61 }; 62 63 public: 64 // Create a new ValueTypeNode with uninitialized values 65 static ValueTypeNode* make(PhaseGVN& gvn, ciValueKlass* klass); 66 // Create a new ValueTypeNode with default values 67 static Node* make_default(PhaseGVN& gvn, ciValueKlass* vk); 68 // Create a new ValueTypeNode and load its values from an oop 69 static Node* make(PhaseGVN& gvn, Node* mem, Node* oop); 70 // Create a new ValueTypeNode and load its values from a flattened value type field or array 71 static Node* make(PhaseGVN& gvn, ciValueKlass* vk, Node* mem, Node* obj, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0); 72 73 // Support for control flow merges 74 ValueTypeNode* clone_with_phis(PhaseGVN* gvn, Node* region); 75 bool has_phi_inputs(Node* region); 76 ValueTypeNode* merge_with(PhaseGVN* gvn, const ValueTypeNode* other, int pnum, bool transform); 77 78 // Store the value type as a flattened (headerless) representation 79 void store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0) const; 80 // Store the field values to memory 81 void store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0) const; 82 83 // Get oop for heap allocated value type (may be TypePtr::NULL_PTR) 84 Node* get_oop() const { return in(Oop); } 85 void set_oop(Node* oop) { set_req(Oop, oop); } 86 // Allocates the value type (if not yet allocated) and returns the oop 87 Node* allocate(GraphKit* kit); 88 bool is_allocated(PhaseGVN* phase) const; 89 90 // Value type fields 91 uint field_count() const { return req() - Values; } 92 Node* field_value(uint index) const; 93 Node* field_value_by_offset(int offset, bool recursive = false) const; 94 void set_field_value(uint index, Node* value); 95 int field_offset(uint index) const; 96 ciType* field_type(uint index) const; 97 98 // Replace ValueTypeNodes in debug info at safepoints with SafePointScalarObjectNodes 99 void make_scalar_in_safepoints(Compile* C); 100 void pass_klass(Node* n, uint pos, const GraphKit& kit); 101 uint pass_fields(Node* call, int base_input, const GraphKit& kit, ciValueKlass* base_vk = NULL, int base_offset = 0); 102 void replace_call_results(Node* call, Compile* C); 103 104 // Allocation optimizations 105 void remove_redundant_allocations(PhaseIterGVN* igvn, PhaseIdealLoop* phase); 106 107 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape); 108 virtual int Opcode() const; 109 110 #ifndef PRODUCT 111 virtual void dump_spec(outputStream* st) const; 112 #endif 113 }; 114 115 #endif // SHARE_VM_OPTO_VALUETYPENODE_HPP