Sat, 10 Sep 2011 00:11:04 -0700
7088020: SEGV in JNIHandleBlock::release_block
Reviewed-by: kvn, twisti
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.
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23 */
25 #ifndef SHARE_VM_RUNTIME_REGISTERMAP_HPP
26 #define SHARE_VM_RUNTIME_REGISTERMAP_HPP
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
46 class JavaThread;
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);
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
93 #ifdef ASSERT
94 void check_location_valid();
95 #else
96 void check_location_valid() {}
97 #endif
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);
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 }
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 }
125 // Called by an entry frame.
126 void clear();
128 bool include_argument_oops() const { return _include_argument_oops; }
129 void set_include_argument_oops(bool f) { _include_argument_oops = f; }
131 JavaThread *thread() const { return _thread; }
132 bool update_map() const { return _update_map; }
134 void print_on(outputStream* st) const;
135 void print() const;
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
154 };
156 #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP