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annotate src/share/vm/runtime/registerMap.hpp @ 2023:54f5dd2aa1d9
Merge
author | zgu |
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date | Sat, 11 Dec 2010 13:46:36 -0500 |
parents | f95d63e2154a |
children | b92c45f2bc75 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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 | |
0 | 40 class JavaThread; |
41 | |
42 // | |
43 // RegisterMap | |
44 // | |
45 // A companion structure used for stack traversal. The RegisterMap contains | |
46 // misc. information needed in order to do correct stack traversal of stack | |
47 // frames. Hence, it must always be passed in as an argument to | |
48 // frame::sender(RegisterMap*). | |
49 // | |
50 // In particular, | |
51 // 1) It provides access to the thread for which the stack belongs. The | |
52 // thread object is needed in order to get sender of a deoptimized frame. | |
53 // | |
54 // 2) It is used to pass information from a callee frame to its caller | |
55 // frame about how the frame should be traversed. This is used to let | |
56 // the caller frame take care of calling oops-do of out-going | |
57 // arguments, when the callee frame is not instantiated yet. This | |
58 // happens, e.g., when a compiled frame calls into | |
59 // resolve_virtual_call. (Hence, it is critical that the same | |
60 // RegisterMap object is used for the entire stack walk. Normally, | |
61 // this is hidden by using the StackFrameStream.) This is used when | |
62 // doing follow_oops and oops_do. | |
63 // | |
64 // 3) The RegisterMap keeps track of the values of callee-saved registers | |
65 // from frame to frame (hence, the name). For some stack traversal the | |
66 // values of the callee-saved registers does not matter, e.g., if you | |
67 // only need the static properies such as frame type, pc, and such. | |
68 // Updating of the RegisterMap can be turned off by instantiating the | |
69 // register map as: RegisterMap map(thread, false); | |
70 | |
71 class RegisterMap : public StackObj { | |
72 public: | |
73 typedef julong LocationValidType; | |
74 enum { | |
75 reg_count = ConcreteRegisterImpl::number_of_registers, | |
76 location_valid_type_size = sizeof(LocationValidType)*8, | |
77 location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size | |
78 }; | |
79 private: | |
80 intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger) | |
81 LocationValidType _location_valid[location_valid_size]; | |
82 bool _include_argument_oops; // Should include argument_oop marked locations for compiler | |
83 JavaThread* _thread; // Reference to current thread | |
84 bool _update_map; // Tells if the register map need to be | |
85 // updated when traversing the stack | |
86 | |
87 #ifdef ASSERT | |
88 void check_location_valid(); | |
89 #else | |
90 void check_location_valid() {} | |
91 #endif | |
92 | |
93 public: | |
94 debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame | |
95 RegisterMap(JavaThread *thread, bool update_map = true); | |
96 RegisterMap(const RegisterMap* map); | |
97 | |
98 address location(VMReg reg) const { | |
99 int index = reg->value() / location_valid_type_size; | |
100 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
101 assert(0 <= index && index < location_valid_size, "range check"); | |
102 if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) { | |
103 return (address) _location[reg->value()]; | |
104 } else { | |
105 return pd_location(reg); | |
106 } | |
107 } | |
108 | |
109 void set_location(VMReg reg, address loc) { | |
110 int index = reg->value() / location_valid_type_size; | |
111 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
112 assert(0 <= index && index < location_valid_size, "range check"); | |
113 assert(_update_map, "updating map that does not need updating"); | |
114 _location[reg->value()] = (intptr_t*) loc; | |
115 _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size)); | |
116 check_location_valid(); | |
117 } | |
118 | |
119 // Called by an entry frame. | |
120 void clear(); | |
121 | |
122 bool include_argument_oops() const { return _include_argument_oops; } | |
123 void set_include_argument_oops(bool f) { _include_argument_oops = f; } | |
124 | |
125 JavaThread *thread() const { return _thread; } | |
126 bool update_map() const { return _update_map; } | |
127 | |
128 void print_on(outputStream* st) const; | |
129 void print() const; | |
130 | |
131 // the following contains the definition of pd_xxx methods | |
1972 | 132 #ifdef TARGET_ARCH_x86 |
133 # include "registerMap_x86.hpp" | |
134 #endif | |
135 #ifdef TARGET_ARCH_sparc | |
136 # include "registerMap_sparc.hpp" | |
137 #endif | |
138 #ifdef TARGET_ARCH_zero | |
139 # include "registerMap_zero.hpp" | |
140 #endif | |
141 | |
0 | 142 }; |
1972 | 143 |
144 #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP |