Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapTable.hpp @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | f95d63e2154a |
children | b92c45f2bc75 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 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_CLASSFILE_STACKMAPTABLE_HPP |
26 #define SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP | |
27 | |
28 #include "classfile/stackMapFrame.hpp" | |
29 #include "memory/allocation.hpp" | |
30 #include "oops/constantPoolOop.hpp" | |
31 #include "oops/methodOop.hpp" | |
32 #include "utilities/globalDefinitions.hpp" | |
33 #ifdef TARGET_ARCH_x86 | |
34 # include "bytes_x86.hpp" | |
35 #endif | |
36 #ifdef TARGET_ARCH_sparc | |
37 # include "bytes_sparc.hpp" | |
38 #endif | |
39 #ifdef TARGET_ARCH_zero | |
40 # include "bytes_zero.hpp" | |
41 #endif | |
42 | |
0 | 43 class StackMapReader; |
44 | |
45 // StackMapTable class is the StackMap table used by type checker | |
46 class StackMapTable : public StackObj { | |
47 private: | |
48 // Logically, the _frame_count (as well as many fields in the StackFrame) | |
49 // should be a u2, but if we defined the variable as that type it will | |
50 // be difficult to detect/recover from overflow or underflow conditions. | |
51 // Widening the type and making it signed will help detect these. | |
52 int32_t _code_length; | |
53 int32_t _frame_count; // Stackmap frame count | |
54 StackMapFrame** _frame_array; | |
55 | |
56 public: | |
57 StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
58 u2 max_locals, u2 max_stack, | |
59 char* code_data, int code_len, TRAPS); | |
60 | |
61 inline int32_t get_frame_count() const { return _frame_count; } | |
62 inline int get_offset(int index) const { | |
63 return _frame_array[index]->offset(); | |
64 } | |
65 | |
66 // Match and/or update current_frame to the frame in stackmap table with | |
67 // specified offset. Return true if the two frames match. | |
68 bool match_stackmap( | |
69 StackMapFrame* current_frame, int32_t offset, | |
70 bool match, bool update, TRAPS) const; | |
71 // Match and/or update current_frame to the frame in stackmap table with | |
72 // specified offset and frame index. Return true if the two frames match. | |
73 bool match_stackmap( | |
74 StackMapFrame* current_frame, int32_t offset, int32_t frame_index, | |
75 bool match, bool update, TRAPS) const; | |
76 | |
77 // Check jump instructions. Make sure there are no uninitialized | |
78 // instances on backward branch. | |
79 void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const; | |
80 | |
81 // The following methods are only used inside this class. | |
82 | |
83 // Returns the frame array index where the frame with offset is stored. | |
84 int get_index_from_offset(int32_t offset) const; | |
85 | |
86 // Make sure that there's no uninitialized object exist on backward branch. | |
87 void check_new_object( | |
88 const StackMapFrame* frame, int32_t target, TRAPS) const; | |
89 | |
90 // Debugging | |
91 void print() const PRODUCT_RETURN; | |
92 }; | |
93 | |
94 class StackMapStream : StackObj { | |
95 private: | |
96 typeArrayHandle _data; | |
97 int _index; | |
98 public: | |
99 StackMapStream(typeArrayHandle ah) | |
100 : _data(ah), _index(0) { | |
101 } | |
102 u1 get_u1(TRAPS) { | |
103 if (_data == NULL || _index >= _data->length()) { | |
104 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
105 } | |
106 return _data->byte_at(_index++); | |
107 } | |
108 u2 get_u2(TRAPS) { | |
109 if (_data == NULL || _index >= _data->length() - 1) { | |
110 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
111 } | |
112 u2 res = Bytes::get_Java_u2((u1*)_data->byte_at_addr(_index)); | |
113 _index += 2; | |
114 return res; | |
115 } | |
116 bool at_end() { | |
117 return (_data == NULL) || (_index == _data->length()); | |
118 } | |
119 static void stackmap_format_error(const char* msg, TRAPS); | |
120 }; | |
121 | |
122 class StackMapReader : StackObj { | |
123 private: | |
124 // information about the class and method | |
125 constantPoolHandle _cp; | |
126 ClassVerifier* _verifier; | |
127 StackMapStream* _stream; | |
128 char* _code_data; | |
129 int32_t _code_length; | |
130 | |
131 // information get from the attribute | |
132 int32_t _frame_count; // frame count | |
133 | |
134 int32_t chop(VerificationType* locals, int32_t length, int32_t chops); | |
135 VerificationType parse_verification_type(u1* flags, TRAPS); | |
136 void check_verification_type_array_size( | |
137 int32_t size, int32_t max_size, TRAPS) { | |
138 if (size < 0 || size > max_size) { | |
139 // Since this error could be caused someone rewriting the method | |
140 // but not knowing to update the stackmap data, we call the the | |
141 // verifier's error method, which may not throw an exception and | |
142 // failover to the old verifier instead. | |
143 _verifier->class_format_error( | |
144 "StackMapTable format error: bad type array size"); | |
145 } | |
146 } | |
147 | |
148 enum { | |
149 SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247, | |
150 SAME_EXTENDED = 251, | |
151 FULL = 255 | |
152 }; | |
153 | |
154 public: | |
155 // Constructor | |
156 StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data, | |
157 int32_t code_len, TRAPS) : | |
158 _verifier(v), _stream(stream), | |
159 _code_data(code_data), _code_length(code_len) { | |
160 methodHandle m = v->method(); | |
161 if (m->has_stackmap_table()) { | |
162 _cp = constantPoolHandle(THREAD, m->constants()); | |
163 _frame_count = _stream->get_u2(CHECK); | |
164 } else { | |
165 // There's no stackmap table present. Frame count and size are 0. | |
166 _frame_count = 0; | |
167 } | |
168 } | |
169 | |
170 inline int32_t get_frame_count() const { return _frame_count; } | |
171 StackMapFrame* next(StackMapFrame* pre_frame, bool first, | |
172 u2 max_locals, u2 max_stack, TRAPS); | |
173 | |
174 void check_end(TRAPS) { | |
175 if (!_stream->at_end()) { | |
176 StackMapStream::stackmap_format_error("wrong attribute size", CHECK); | |
177 } | |
178 } | |
179 }; | |
1972 | 180 |
181 #endif // SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP |