1 /* 2 * Copyright (c) 2014, 2019, 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_OPTO_CASTNODE_HPP 26 #define SHARE_OPTO_CASTNODE_HPP 27 28 #include "opto/node.hpp" 29 #include "opto/opcodes.hpp" 30 31 32 //------------------------------ConstraintCastNode----------------------------- 33 // cast to a different range 34 class ConstraintCastNode: public TypeNode { 35 public: 36 enum DependencyType { 37 RegularDependency, // if cast doesn't improve input type, cast can be removed 38 StrongDependency, // leave cast in even if _type doesn't improve input type, can be replaced by stricter dominating cast if one exist 39 UnconditionalDependency // leave cast in unconditionally 40 }; 41 42 protected: 43 const DependencyType _dependency; 44 virtual bool cmp( const Node &n ) const; 45 virtual uint size_of() const; 46 const Type* widen_type(const PhaseGVN* phase, const Type* res, BasicType bt) const; 47 48 public: 49 ConstraintCastNode(Node *n, const Type *t, DependencyType dependency) 50 : TypeNode(t,2), _dependency(dependency) { 51 init_class_id(Class_ConstraintCast); 52 init_req(1, n); 53 } 54 virtual Node* Identity(PhaseGVN* phase); 55 virtual const Type* Value(PhaseGVN* phase) const; 56 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 57 virtual int Opcode() const; 58 virtual uint ideal_reg() const = 0; 59 virtual bool depends_only_on_test() const { return _dependency == RegularDependency; } 60 bool carry_dependency() const { return _dependency != RegularDependency; } 61 TypeNode* dominating_cast(PhaseGVN* gvn, PhaseTransform* pt) const; 62 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, DependencyType dependency); 63 static Node* make(Node* c, Node *n, const Type *t, DependencyType dependency, BasicType bt); 64 65 #ifndef PRODUCT 66 virtual void dump_spec(outputStream *st) const; 67 #endif 68 69 static Node* make_cast_for_type(Node* c, Node* in, const Type* type, DependencyType dependency); 70 71 Node* optimize_integer_cast(PhaseGVN* phase, BasicType bt); 72 }; 73 74 //------------------------------CastIINode------------------------------------- 75 // cast integer to integer (different range) 76 class CastIINode: public ConstraintCastNode { 77 protected: 78 // Is this node dependent on a range check? 79 const bool _range_check_dependency; 80 virtual bool cmp(const Node &n) const; 81 virtual uint size_of() const; 82 83 public: 84 CastIINode(Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false) 85 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) { 86 init_class_id(Class_CastII); 87 } 88 CastIINode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false) 89 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) { 90 init_class_id(Class_CastII); 91 init_req(0, ctrl); 92 } 93 virtual int Opcode() const; 94 virtual uint ideal_reg() const { return Op_RegI; } 95 virtual Node* Identity(PhaseGVN* phase); 96 virtual const Type* Value(PhaseGVN* phase) const; 97 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 98 const bool has_range_check() { 99 #ifdef _LP64 100 return _range_check_dependency; 101 #else 102 assert(!_range_check_dependency, "Should not have range check dependency"); 103 return false; 104 #endif 105 } 106 107 #ifndef PRODUCT 108 virtual void dump_spec(outputStream* st) const; 109 #endif 110 }; 111 112 class CastLLNode: public ConstraintCastNode { 113 public: 114 CastLLNode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency) 115 : ConstraintCastNode(n, t, dependency) { 116 init_class_id(Class_CastLL); 117 init_req(0, ctrl); 118 } 119 CastLLNode(Node* n, const Type* t, DependencyType dependency = RegularDependency) 120 : ConstraintCastNode(n, t, dependency){ 121 init_class_id(Class_CastLL); 122 } 123 124 virtual const Type* Value(PhaseGVN* phase) const; 125 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape); 126 virtual int Opcode() const; 127 virtual uint ideal_reg() const { return Op_RegL; } 128 }; 129 130 class CastFFNode: public ConstraintCastNode { 131 public: 132 CastFFNode(Node* n, const Type* t, DependencyType dependency = RegularDependency) 133 : ConstraintCastNode(n, t, dependency){ 134 init_class_id(Class_CastFF); 135 } 136 virtual int Opcode() const; 137 virtual uint ideal_reg() const { return in(1)->ideal_reg(); } 138 }; 139 140 class CastDDNode: public ConstraintCastNode { 141 public: 142 CastDDNode(Node* n, const Type* t, DependencyType dependency = RegularDependency) 143 : ConstraintCastNode(n, t, dependency){ 144 init_class_id(Class_CastDD); 145 } 146 virtual int Opcode() const; 147 virtual uint ideal_reg() const { return in(1)->ideal_reg(); } 148 }; 149 150 class CastVVNode: public ConstraintCastNode { 151 public: 152 CastVVNode(Node* n, const Type* t, DependencyType dependency = RegularDependency) 153 : ConstraintCastNode(n, t, dependency){ 154 init_class_id(Class_CastVV); 155 } 156 virtual int Opcode() const; 157 virtual uint ideal_reg() const { return in(1)->ideal_reg(); } 158 }; 159 160 161 //------------------------------CastPPNode------------------------------------- 162 // cast pointer to pointer (different type) 163 class CastPPNode: public ConstraintCastNode { 164 public: 165 CastPPNode (Node *n, const Type *t, DependencyType dependency = RegularDependency) 166 : ConstraintCastNode(n, t, dependency) { 167 } 168 virtual int Opcode() const; 169 virtual uint ideal_reg() const { return Op_RegP; } 170 }; 171 172 //------------------------------CheckCastPPNode-------------------------------- 173 // for _checkcast, cast pointer to pointer (different type), without JOIN, 174 class CheckCastPPNode: public ConstraintCastNode { 175 public: 176 CheckCastPPNode(Node *c, Node *n, const Type *t, DependencyType dependency = RegularDependency) 177 : ConstraintCastNode(n, t, dependency) { 178 init_class_id(Class_CheckCastPP); 179 init_req(0, c); 180 } 181 182 virtual const Type* Value(PhaseGVN* phase) const; 183 virtual int Opcode() const; 184 virtual uint ideal_reg() const { return Op_RegP; } 185 bool depends_only_on_test() const { return !type()->isa_rawptr() && ConstraintCastNode::depends_only_on_test(); } 186 }; 187 188 189 //------------------------------CastX2PNode------------------------------------- 190 // convert a machine-pointer-sized integer to a raw pointer 191 class CastX2PNode : public Node { 192 public: 193 CastX2PNode( Node *n ) : Node(NULL, n) {} 194 virtual int Opcode() const; 195 virtual const Type* Value(PhaseGVN* phase) const; 196 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 197 virtual Node* Identity(PhaseGVN* phase); 198 virtual uint ideal_reg() const { return Op_RegP; } 199 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; } 200 }; 201 202 //------------------------------CastP2XNode------------------------------------- 203 // Used in both 32-bit and 64-bit land. 204 // Used for card-marks and unsafe pointer math. 205 class CastP2XNode : public Node { 206 public: 207 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {} 208 virtual int Opcode() const; 209 virtual const Type* Value(PhaseGVN* phase) const; 210 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 211 virtual Node* Identity(PhaseGVN* phase); 212 virtual uint ideal_reg() const { return Op_RegX; } 213 virtual const Type *bottom_type() const { return TypeX_X; } 214 // Return false to keep node from moving away from an associated card mark. 215 virtual bool depends_only_on_test() const { return false; } 216 }; 217 218 219 220 #endif // SHARE_OPTO_CASTNODE_HPP