1 /* 2 * Copyright (c) 2014, 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_CASTNODE_HPP 26 #define SHARE_VM_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 uint cmp( const Node &n ) const; 39 virtual uint size_of() const; 40 41 public: 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; 52 virtual bool depends_only_on_test() const { return !_carry_dependency; } 53 bool carry_dependency() const { return _carry_dependency; } 54 TypeNode* dominating_cast(PhaseTransform *phase) const; 55 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, bool carry_dependency); 56 57 #ifndef PRODUCT 58 virtual void dump_spec(outputStream *st) const; 59 #endif 60 }; 61 62 //------------------------------CastIINode------------------------------------- 63 // cast integer to integer (different range) 64 class CastIINode: public ConstraintCastNode { 65 protected: 66 // Is this node dependent on a range check? 67 const bool _range_check_dependency; 68 virtual uint cmp(const Node &n) const; 69 virtual uint size_of() const; 70 71 public: 72 CastIINode(Node* n, const Type* t, bool carry_dependency = false, bool range_check_dependency = false) 73 : ConstraintCastNode(n, t, carry_dependency), _range_check_dependency(range_check_dependency) { 74 init_class_id(Class_CastII); 75 } 76 virtual int Opcode() const; 77 virtual uint ideal_reg() const { return Op_RegI; } 78 virtual const Type* Value(PhaseGVN* phase) const; 79 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 80 const bool has_range_check() { 81 #ifdef _LP64 82 return _range_check_dependency; 83 #else 84 assert(!_range_check_dependency, "Should not have range check dependency"); 85 return false; 86 #endif 87 } 88 89 #ifndef PRODUCT 90 virtual void dump_spec(outputStream* st) const; 91 #endif 92 }; 93 94 //------------------------------CastPPNode------------------------------------- 95 // cast pointer to pointer (different type) 96 class CastPPNode: public ConstraintCastNode { 97 public: 98 CastPPNode (Node *n, const Type *t, bool carry_dependency = false) 99 : ConstraintCastNode(n, t, carry_dependency) { 100 } 101 virtual int Opcode() const; 102 virtual uint ideal_reg() const { return Op_RegP; } 103 }; 104 105 //------------------------------CheckCastPPNode-------------------------------- 106 // for _checkcast, cast pointer to pointer (different type), without JOIN, 107 class CheckCastPPNode: public ConstraintCastNode { 108 public: 109 CheckCastPPNode(Node *c, Node *n, const Type *t, bool carry_dependency = false) 110 : ConstraintCastNode(n, t, carry_dependency) { 111 init_class_id(Class_CheckCastPP); 112 init_req(0, c); 113 } 114 115 virtual Node* Identity(PhaseGVN* phase); 116 virtual const Type* Value(PhaseGVN* phase) const; 117 virtual int Opcode() const; 118 virtual uint ideal_reg() const { return Op_RegP; } 119 }; 120 121 122 //------------------------------CastX2PNode------------------------------------- 123 // convert a machine-pointer-sized integer to a raw pointer 124 class CastX2PNode : public Node { 125 public: 126 CastX2PNode( Node *n ) : Node(NULL, n) {} 127 virtual int Opcode() const; 128 virtual const Type* Value(PhaseGVN* phase) const; 129 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 130 virtual Node* Identity(PhaseGVN* phase); 131 virtual uint ideal_reg() const { return Op_RegP; } 132 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; } 133 }; 134 135 //------------------------------CastP2XNode------------------------------------- 136 // Used in both 32-bit and 64-bit land. 137 // Used for card-marks and unsafe pointer math. 138 class CastP2XNode : public Node { 139 public: 140 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {} 141 virtual int Opcode() const; 142 virtual const Type* Value(PhaseGVN* phase) const; 143 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); 144 virtual Node* Identity(PhaseGVN* phase); 145 virtual uint ideal_reg() const { return Op_RegX; } 146 virtual const Type *bottom_type() const { return TypeX_X; } 147 // Return false to keep node from moving away from an associated card mark. 148 virtual bool depends_only_on_test() const { return false; } 149 }; 150 151 152 153 #endif // SHARE_VM_OPTO_CASTNODE_HPP