Tue, 08 Aug 2017 15:57:29 +0800
merge
1 /*
2 * Copyright (c) 2003, 2012, 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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP
32 #define SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP
34 #include "classfile/stackMapFrame.hpp"
35 #include "classfile/verifier.hpp"
36 #include "memory/allocation.hpp"
37 #include "oops/constantPool.hpp"
38 #include "oops/method.hpp"
39 #include "utilities/globalDefinitions.hpp"
40 #ifdef TARGET_ARCH_x86
41 # include "bytes_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_mips
44 # include "bytes_mips.hpp"
45 #endif
46 #ifdef TARGET_ARCH_sparc
47 # include "bytes_sparc.hpp"
48 #endif
49 #ifdef TARGET_ARCH_zero
50 # include "bytes_zero.hpp"
51 #endif
52 #ifdef TARGET_ARCH_arm
53 # include "bytes_arm.hpp"
54 #endif
55 #ifdef TARGET_ARCH_ppc
56 # include "bytes_ppc.hpp"
57 #endif
59 class StackMapReader;
61 // StackMapTable class is the StackMap table used by type checker
62 class StackMapTable : public StackObj {
63 private:
64 // Logically, the _frame_count (as well as many fields in the StackFrame)
65 // should be a u2, but if we defined the variable as that type it will
66 // be difficult to detect/recover from overflow or underflow conditions.
67 // Widening the type and making it signed will help detect these.
68 int32_t _code_length;
69 int32_t _frame_count; // Stackmap frame count
70 StackMapFrame** _frame_array;
72 public:
73 StackMapTable(StackMapReader* reader, StackMapFrame* init_frame,
74 u2 max_locals, u2 max_stack,
75 char* code_data, int code_len, TRAPS);
77 inline int32_t get_frame_count() const { return _frame_count; }
78 inline int get_offset(int index) const {
79 return _frame_array[index]->offset();
80 }
82 // Match and/or update current_frame to the frame in stackmap table with
83 // specified offset. Return true if the two frames match.
84 bool match_stackmap(
85 StackMapFrame* current_frame, int32_t offset,
86 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const;
87 // Match and/or update current_frame to the frame in stackmap table with
88 // specified offset and frame index. Return true if the two frames match.
89 bool match_stackmap(
90 StackMapFrame* current_frame, int32_t offset, int32_t frame_index,
91 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const;
93 // Check jump instructions. Make sure there are no uninitialized
94 // instances on backward branch.
95 void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const;
97 // The following methods are only used inside this class.
99 // Returns the frame array index where the frame with offset is stored.
100 int get_index_from_offset(int32_t offset) const;
102 void print_on(outputStream* str) const;
103 };
105 class StackMapStream : StackObj {
106 private:
107 Array<u1>* _data;
108 int _index;
109 public:
110 StackMapStream(Array<u1>* ah)
111 : _data(ah), _index(0) {
112 }
113 u1 get_u1(TRAPS) {
114 if (_data == NULL || _index >= _data->length()) {
115 stackmap_format_error("access beyond the end of attribute", CHECK_0);
116 }
117 return _data->at(_index++);
118 }
119 u2 get_u2(TRAPS) {
120 if (_data == NULL || _index >= _data->length() - 1) {
121 stackmap_format_error("access beyond the end of attribute", CHECK_0);
122 }
123 u2 res = Bytes::get_Java_u2(_data->adr_at(_index));
124 _index += 2;
125 return res;
126 }
127 bool at_end() {
128 return (_data == NULL) || (_index == _data->length());
129 }
130 static void stackmap_format_error(const char* msg, TRAPS);
131 };
133 class StackMapReader : StackObj {
134 private:
135 // information about the class and method
136 constantPoolHandle _cp;
137 ClassVerifier* _verifier;
138 StackMapStream* _stream;
139 char* _code_data;
140 int32_t _code_length;
142 // information get from the attribute
143 int32_t _frame_count; // frame count
145 int32_t chop(VerificationType* locals, int32_t length, int32_t chops);
146 VerificationType parse_verification_type(u1* flags, TRAPS);
147 void check_verification_type_array_size(
148 int32_t size, int32_t max_size, TRAPS) {
149 if (size < 0 || size > max_size) {
150 // Since this error could be caused someone rewriting the method
151 // but not knowing to update the stackmap data, we call the the
152 // verifier's error method, which may not throw an exception and
153 // failover to the old verifier instead.
154 _verifier->class_format_error(
155 "StackMapTable format error: bad type array size");
156 }
157 }
159 enum {
160 SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247,
161 SAME_EXTENDED = 251,
162 FULL = 255
163 };
165 public:
166 // Constructor
167 StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data,
168 int32_t code_len, TRAPS) :
169 _verifier(v), _stream(stream),
170 _code_data(code_data), _code_length(code_len) {
171 methodHandle m = v->method();
172 if (m->has_stackmap_table()) {
173 _cp = constantPoolHandle(THREAD, m->constants());
174 _frame_count = _stream->get_u2(CHECK);
175 } else {
176 // There's no stackmap table present. Frame count and size are 0.
177 _frame_count = 0;
178 }
179 }
181 inline int32_t get_frame_count() const { return _frame_count; }
182 StackMapFrame* next(StackMapFrame* pre_frame, bool first,
183 u2 max_locals, u2 max_stack, TRAPS);
185 void check_end(TRAPS) {
186 if (!_stream->at_end()) {
187 StackMapStream::stackmap_format_error("wrong attribute size", CHECK);
188 }
189 }
190 };
192 #endif // SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP