Mercurial > hg > truffle
comparison src/share/vm/classfile/stackMapTable.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class StackMapReader; | |
26 | |
27 // StackMapTable class is the StackMap table used by type checker | |
28 class StackMapTable : public StackObj { | |
29 private: | |
30 // Logically, the _frame_count (as well as many fields in the StackFrame) | |
31 // should be a u2, but if we defined the variable as that type it will | |
32 // be difficult to detect/recover from overflow or underflow conditions. | |
33 // Widening the type and making it signed will help detect these. | |
34 int32_t _code_length; | |
35 int32_t _frame_count; // Stackmap frame count | |
36 StackMapFrame** _frame_array; | |
37 | |
38 public: | |
39 StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
40 u2 max_locals, u2 max_stack, | |
41 char* code_data, int code_len, TRAPS); | |
42 | |
43 inline int32_t get_frame_count() const { return _frame_count; } | |
44 inline int get_offset(int index) const { | |
45 return _frame_array[index]->offset(); | |
46 } | |
47 | |
48 // Match and/or update current_frame to the frame in stackmap table with | |
49 // specified offset. Return true if the two frames match. | |
50 bool match_stackmap( | |
51 StackMapFrame* current_frame, int32_t offset, | |
52 bool match, bool update, TRAPS) const; | |
53 // Match and/or update current_frame to the frame in stackmap table with | |
54 // specified offset and frame index. Return true if the two frames match. | |
55 bool match_stackmap( | |
56 StackMapFrame* current_frame, int32_t offset, int32_t frame_index, | |
57 bool match, bool update, TRAPS) const; | |
58 | |
59 // Check jump instructions. Make sure there are no uninitialized | |
60 // instances on backward branch. | |
61 void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const; | |
62 | |
63 // The following methods are only used inside this class. | |
64 | |
65 // Returns the frame array index where the frame with offset is stored. | |
66 int get_index_from_offset(int32_t offset) const; | |
67 | |
68 // Make sure that there's no uninitialized object exist on backward branch. | |
69 void check_new_object( | |
70 const StackMapFrame* frame, int32_t target, TRAPS) const; | |
71 | |
72 // Debugging | |
73 void print() const PRODUCT_RETURN; | |
74 }; | |
75 | |
76 class StackMapStream : StackObj { | |
77 private: | |
78 typeArrayHandle _data; | |
79 int _index; | |
80 public: | |
81 StackMapStream(typeArrayHandle ah) | |
82 : _data(ah), _index(0) { | |
83 } | |
84 u1 get_u1(TRAPS) { | |
85 if (_data == NULL || _index >= _data->length()) { | |
86 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
87 } | |
88 return _data->byte_at(_index++); | |
89 } | |
90 u2 get_u2(TRAPS) { | |
91 if (_data == NULL || _index >= _data->length() - 1) { | |
92 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
93 } | |
94 u2 res = Bytes::get_Java_u2((u1*)_data->byte_at_addr(_index)); | |
95 _index += 2; | |
96 return res; | |
97 } | |
98 bool at_end() { | |
99 return (_data == NULL) || (_index == _data->length()); | |
100 } | |
101 static void stackmap_format_error(const char* msg, TRAPS); | |
102 }; | |
103 | |
104 class StackMapReader : StackObj { | |
105 private: | |
106 // information about the class and method | |
107 constantPoolHandle _cp; | |
108 ClassVerifier* _verifier; | |
109 StackMapStream* _stream; | |
110 char* _code_data; | |
111 int32_t _code_length; | |
112 | |
113 // information get from the attribute | |
114 int32_t _frame_count; // frame count | |
115 | |
116 int32_t chop(VerificationType* locals, int32_t length, int32_t chops); | |
117 VerificationType parse_verification_type(u1* flags, TRAPS); | |
118 void check_verification_type_array_size( | |
119 int32_t size, int32_t max_size, TRAPS) { | |
120 if (size < 0 || size > max_size) { | |
121 // Since this error could be caused someone rewriting the method | |
122 // but not knowing to update the stackmap data, we call the the | |
123 // verifier's error method, which may not throw an exception and | |
124 // failover to the old verifier instead. | |
125 _verifier->class_format_error( | |
126 "StackMapTable format error: bad type array size"); | |
127 } | |
128 } | |
129 | |
130 enum { | |
131 SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247, | |
132 SAME_EXTENDED = 251, | |
133 FULL = 255 | |
134 }; | |
135 | |
136 public: | |
137 // Constructor | |
138 StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data, | |
139 int32_t code_len, TRAPS) : | |
140 _verifier(v), _stream(stream), | |
141 _code_data(code_data), _code_length(code_len) { | |
142 methodHandle m = v->method(); | |
143 if (m->has_stackmap_table()) { | |
144 _cp = constantPoolHandle(THREAD, m->constants()); | |
145 _frame_count = _stream->get_u2(CHECK); | |
146 } else { | |
147 // There's no stackmap table present. Frame count and size are 0. | |
148 _frame_count = 0; | |
149 } | |
150 } | |
151 | |
152 inline int32_t get_frame_count() const { return _frame_count; } | |
153 StackMapFrame* next(StackMapFrame* pre_frame, bool first, | |
154 u2 max_locals, u2 max_stack, TRAPS); | |
155 | |
156 void check_end(TRAPS) { | |
157 if (!_stream->at_end()) { | |
158 StackMapStream::stackmap_format_error("wrong attribute size", CHECK); | |
159 } | |
160 } | |
161 }; |