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comparison: src/share/vm/runtime/registerMap.hpp
src/share/vm/runtime/registerMap.hpp
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| 1 /* | |
| 2 * Copyright (c) 2002, 2011, 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_RUNTIME_REGISTERMAP_HPP | |
| 26 #define SHARE_VM_RUNTIME_REGISTERMAP_HPP | |
| 27 | |
| 28 #include "code/vmreg.hpp" | |
| 29 #include "utilities/globalDefinitions.hpp" | |
| 30 #ifdef TARGET_ARCH_x86 | |
| 31 # include "register_x86.hpp" | |
| 32 #endif | |
| 33 #ifdef TARGET_ARCH_sparc | |
| 34 # include "register_sparc.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_ARCH_zero | |
| 37 # include "register_zero.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_ARCH_arm | |
| 40 # include "register_arm.hpp" | |
| 41 #endif | |
| 42 #ifdef TARGET_ARCH_ppc | |
| 43 # include "register_ppc.hpp" | |
| 44 #endif | |
| 45 | |
| 46 class JavaThread; | |
| 47 | |
| 48 // | |
| 49 // RegisterMap | |
| 50 // | |
| 51 // A companion structure used for stack traversal. The RegisterMap contains | |
| 52 // misc. information needed in order to do correct stack traversal of stack | |
| 53 // frames. Hence, it must always be passed in as an argument to | |
| 54 // frame::sender(RegisterMap*). | |
| 55 // | |
| 56 // In particular, | |
| 57 // 1) It provides access to the thread for which the stack belongs. The | |
| 58 // thread object is needed in order to get sender of a deoptimized frame. | |
| 59 // | |
| 60 // 2) It is used to pass information from a callee frame to its caller | |
| 61 // frame about how the frame should be traversed. This is used to let | |
| 62 // the caller frame take care of calling oops-do of out-going | |
| 63 // arguments, when the callee frame is not instantiated yet. This | |
| 64 // happens, e.g., when a compiled frame calls into | |
| 65 // resolve_virtual_call. (Hence, it is critical that the same | |
| 66 // RegisterMap object is used for the entire stack walk. Normally, | |
| 67 // this is hidden by using the StackFrameStream.) This is used when | |
| 68 // doing follow_oops and oops_do. | |
| 69 // | |
| 70 // 3) The RegisterMap keeps track of the values of callee-saved registers | |
| 71 // from frame to frame (hence, the name). For some stack traversal the | |
| 72 // values of the callee-saved registers does not matter, e.g., if you | |
| 73 // only need the static properies such as frame type, pc, and such. | |
| 74 // Updating of the RegisterMap can be turned off by instantiating the | |
| 75 // register map as: RegisterMap map(thread, false); | |
| 76 | |
| 77 class RegisterMap : public StackObj { | |
| 78 public: | |
| 79 typedef julong LocationValidType; | |
| 80 enum { | |
| 81 reg_count = ConcreteRegisterImpl::number_of_registers, | |
| 82 location_valid_type_size = sizeof(LocationValidType)*8, | |
| 83 location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size | |
| 84 }; | |
| 85 private: | |
| 86 intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger) | |
| 87 LocationValidType _location_valid[location_valid_size]; | |
| 88 bool _include_argument_oops; // Should include argument_oop marked locations for compiler | |
| 89 JavaThread* _thread; // Reference to current thread | |
| 90 bool _update_map; // Tells if the register map need to be | |
| 91 // updated when traversing the stack | |
| 92 | |
| 93 #ifdef ASSERT | |
| 94 void check_location_valid(); | |
| 95 #else | |
| 96 void check_location_valid() {} | |
| 97 #endif | |
| 98 | |
| 99 public: | |
| 100 debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame | |
| 101 RegisterMap(JavaThread *thread, bool update_map = true); | |
| 102 RegisterMap(const RegisterMap* map); | |
| 103 | |
| 104 address location(VMReg reg) const { | |
| 105 int index = reg->value() / location_valid_type_size; | |
| 106 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
| 107 assert(0 <= index && index < location_valid_size, "range check"); | |
| 108 if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) { | |
| 109 return (address) _location[reg->value()]; | |
| 110 } else { | |
| 111 return pd_location(reg); | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 void set_location(VMReg reg, address loc) { | |
| 116 int index = reg->value() / location_valid_type_size; | |
| 117 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
| 118 assert(0 <= index && index < location_valid_size, "range check"); | |
| 119 assert(_update_map, "updating map that does not need updating"); | |
| 120 _location[reg->value()] = (intptr_t*) loc; | |
| 121 _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size)); | |
| 122 check_location_valid(); | |
| 123 } | |
| 124 | |
| 125 // Called by an entry frame. | |
| 126 void clear(); | |
| 127 | |
| 128 bool include_argument_oops() const { return _include_argument_oops; } | |
| 129 void set_include_argument_oops(bool f) { _include_argument_oops = f; } | |
| 130 | |
| 131 JavaThread *thread() const { return _thread; } | |
| 132 bool update_map() const { return _update_map; } | |
| 133 | |
| 134 void print_on(outputStream* st) const; | |
| 135 void print() const; | |
| 136 | |
| 137 // the following contains the definition of pd_xxx methods | |
| 138 #ifdef TARGET_ARCH_x86 | |
| 139 # include "registerMap_x86.hpp" | |
| 140 #endif | |
| 141 #ifdef TARGET_ARCH_sparc | |
| 142 # include "registerMap_sparc.hpp" | |
| 143 #endif | |
| 144 #ifdef TARGET_ARCH_zero | |
| 145 # include "registerMap_zero.hpp" | |
| 146 #endif | |
| 147 #ifdef TARGET_ARCH_arm | |
| 148 # include "registerMap_arm.hpp" | |
| 149 #endif | |
| 150 #ifdef TARGET_ARCH_ppc | |
| 151 # include "registerMap_ppc.hpp" | |
| 152 #endif | |
| 153 | |
| 154 }; | |
| 155 | |
| 156 #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP |
