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 protected: 36 // Can this node be removed post CCP or does it carry a required dependency? 37 const bool _carry_dependency; 38 virtual bool cmp( const Node &n ) const; 39 virtual uint size_of() const; 40 41 public: ConstraintCastNode(Node * n,const Type * t,bool carry_dependency)42 ConstraintCastNode(Node *n, const Type *t, bool carry_dependency) 43 : TypeNode(t,2), _carry_dependency(carry_dependency) { 44 init_class_id(Class_ConstraintCast); 45 init_req(1, n); 46 } 47 virtual Node* Identity(PhaseGVN* phase); 48 virtual const Type* Value(PhaseGVN* phase) const; 49 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 50 virtual int Opcode() const; 51 virtual uint ideal_reg() const = 0; depends_only_on_test() const52 virtual bool depends_only_on_test() const { return !_carry_dependency; } carry_dependency() const53 bool carry_dependency() const { return _carry_dependency; } 54 TypeNode* dominating_cast(PhaseGVN* gvn, PhaseTransform* pt) const; 55 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, bool carry_dependency); 56 static Node* make(Node* c, Node *n, const Type *t, BasicType bt); operates_on(BasicType bt,bool signed_int) const57 virtual bool operates_on(BasicType bt, bool signed_int) const { 58 assert(bt == T_INT || bt == T_LONG, "unsupported"); 59 return false; 60 } 61 62 #ifndef PRODUCT 63 virtual void dump_spec(outputStream *st) const; 64 #endif 65 }; 66 67 //------------------------------CastIINode------------------------------------- 68 // cast integer to integer (different range) 69 class CastIINode: public ConstraintCastNode { 70 protected: 71 // Is this node dependent on a range check? 72 const bool _range_check_dependency; 73 virtual bool cmp(const Node &n) const; 74 virtual uint size_of() const; 75 76 public: CastIINode(Node * n,const Type * t,bool carry_dependency=false,bool range_check_dependency=false)77 CastIINode(Node* n, const Type* t, bool carry_dependency = false, bool range_check_dependency = false) 78 : ConstraintCastNode(n, t, carry_dependency), _range_check_dependency(range_check_dependency) { 79 init_class_id(Class_CastII); 80 } 81 virtual int Opcode() const; ideal_reg() const82 virtual uint ideal_reg() const { return Op_RegI; } 83 virtual Node* Identity(PhaseGVN* phase); 84 virtual const Type* Value(PhaseGVN* phase) const; 85 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); has_range_check()86 const bool has_range_check() { 87 #ifdef _LP64 88 return _range_check_dependency; 89 #else 90 assert(!_range_check_dependency, "Should not have range check dependency"); 91 return false; 92 #endif 93 } operates_on(BasicType bt,bool signed_int) const94 virtual bool operates_on(BasicType bt, bool signed_int) const { 95 assert(bt == T_INT || bt == T_LONG, "unsupported"); 96 return bt == T_INT; 97 } 98 99 #ifndef PRODUCT 100 virtual void dump_spec(outputStream* st) const; 101 #endif 102 }; 103 104 class CastLLNode: public ConstraintCastNode { 105 public: CastLLNode(Node * n,const Type * t,bool carry_dependency=false)106 CastLLNode(Node* n, const Type* t, bool carry_dependency = false) 107 : ConstraintCastNode(n, t, carry_dependency){ 108 init_class_id(Class_CastLL); 109 } operates_on(BasicType bt,bool signed_int) const110 virtual bool operates_on(BasicType bt, bool signed_int) const { 111 assert(bt == T_INT || bt == T_LONG, "unsupported"); 112 return bt == T_LONG; 113 } 114 virtual int Opcode() const; ideal_reg() const115 virtual uint ideal_reg() const { return Op_RegL; } 116 }; 117 118 //------------------------------CastPPNode------------------------------------- 119 // cast pointer to pointer (different type) 120 class CastPPNode: public ConstraintCastNode { 121 public: CastPPNode(Node * n,const Type * t,bool carry_dependency=false)122 CastPPNode (Node *n, const Type *t, bool carry_dependency = false) 123 : ConstraintCastNode(n, t, carry_dependency) { 124 } 125 virtual int Opcode() const; ideal_reg() const126 virtual uint ideal_reg() const { return Op_RegP; } 127 }; 128 129 //------------------------------CheckCastPPNode-------------------------------- 130 // for _checkcast, cast pointer to pointer (different type), without JOIN, 131 class CheckCastPPNode: public ConstraintCastNode { 132 public: CheckCastPPNode(Node * c,Node * n,const Type * t,bool carry_dependency=false)133 CheckCastPPNode(Node *c, Node *n, const Type *t, bool carry_dependency = false) 134 : ConstraintCastNode(n, t, carry_dependency) { 135 init_class_id(Class_CheckCastPP); 136 init_req(0, c); 137 } 138 139 virtual Node* Identity(PhaseGVN* phase); 140 virtual const Type* Value(PhaseGVN* phase) const; 141 virtual int Opcode() const; ideal_reg() const142 virtual uint ideal_reg() const { return Op_RegP; } depends_only_on_test() const143 bool depends_only_on_test() const { return !type()->isa_rawptr() && ConstraintCastNode::depends_only_on_test(); } 144 }; 145 146 147 //------------------------------CastX2PNode------------------------------------- 148 // convert a machine-pointer-sized integer to a raw pointer 149 class CastX2PNode : public Node { 150 public: CastX2PNode(Node * n)151 CastX2PNode( Node *n ) : Node(NULL, n) {} 152 virtual int Opcode() const; 153 virtual const Type* Value(PhaseGVN* phase) const; 154 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 155 virtual Node* Identity(PhaseGVN* phase); ideal_reg() const156 virtual uint ideal_reg() const { return Op_RegP; } bottom_type() const157 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; } 158 }; 159 160 //------------------------------CastP2XNode------------------------------------- 161 // Used in both 32-bit and 64-bit land. 162 // Used for card-marks and unsafe pointer math. 163 class CastP2XNode : public Node { 164 public: CastP2XNode(Node * ctrl,Node * n)165 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {} 166 virtual int Opcode() const; 167 virtual const Type* Value(PhaseGVN* phase) const; 168 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 169 virtual Node* Identity(PhaseGVN* phase); ideal_reg() const170 virtual uint ideal_reg() const { return Op_RegX; } bottom_type() const171 virtual const Type *bottom_type() const { return TypeX_X; } 172 // Return false to keep node from moving away from an associated card mark. depends_only_on_test() const173 virtual bool depends_only_on_test() const { return false; } 174 }; 175 176 177 178 #endif // SHARE_OPTO_CASTNODE_HPP 179