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comparison: src/share/vm/classfile/stackMapTable.hpp
src/share/vm/classfile/stackMapTable.hpp
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| 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 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP | |
| 26 #define SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP | |
| 27 | |
| 28 #include "classfile/stackMapFrame.hpp" | |
| 29 #include "classfile/verifier.hpp" | |
| 30 #include "memory/allocation.hpp" | |
| 31 #include "oops/constantPool.hpp" | |
| 32 #include "oops/method.hpp" | |
| 33 #include "utilities/globalDefinitions.hpp" | |
| 34 #ifdef TARGET_ARCH_x86 | |
| 35 # include "bytes_x86.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_ARCH_sparc | |
| 38 # include "bytes_sparc.hpp" | |
| 39 #endif | |
| 40 #ifdef TARGET_ARCH_zero | |
| 41 # include "bytes_zero.hpp" | |
| 42 #endif | |
| 43 #ifdef TARGET_ARCH_arm | |
| 44 # include "bytes_arm.hpp" | |
| 45 #endif | |
| 46 #ifdef TARGET_ARCH_ppc | |
| 47 # include "bytes_ppc.hpp" | |
| 48 #endif | |
| 49 | |
| 50 class StackMapReader; | |
| 51 | |
| 52 // StackMapTable class is the StackMap table used by type checker | |
| 53 class StackMapTable : public StackObj { | |
| 54 private: | |
| 55 // Logically, the _frame_count (as well as many fields in the StackFrame) | |
| 56 // should be a u2, but if we defined the variable as that type it will | |
| 57 // be difficult to detect/recover from overflow or underflow conditions. | |
| 58 // Widening the type and making it signed will help detect these. | |
| 59 int32_t _code_length; | |
| 60 int32_t _frame_count; // Stackmap frame count | |
| 61 StackMapFrame** _frame_array; | |
| 62 | |
| 63 public: | |
| 64 StackMapTable(StackMapReader* reader, StackMapFrame* init_frame, | |
| 65 u2 max_locals, u2 max_stack, | |
| 66 char* code_data, int code_len, TRAPS); | |
| 67 | |
| 68 inline int32_t get_frame_count() const { return _frame_count; } | |
| 69 inline int get_offset(int index) const { | |
| 70 return _frame_array[index]->offset(); | |
| 71 } | |
| 72 | |
| 73 // Match and/or update current_frame to the frame in stackmap table with | |
| 74 // specified offset. Return true if the two frames match. | |
| 75 bool match_stackmap( | |
| 76 StackMapFrame* current_frame, int32_t offset, | |
| 77 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const; | |
| 78 // Match and/or update current_frame to the frame in stackmap table with | |
| 79 // specified offset and frame index. Return true if the two frames match. | |
| 80 bool match_stackmap( | |
| 81 StackMapFrame* current_frame, int32_t offset, int32_t frame_index, | |
| 82 bool match, bool update, bool handler, ErrorContext* ctx, TRAPS) const; | |
| 83 | |
| 84 // Check jump instructions. Make sure there are no uninitialized | |
| 85 // instances on backward branch. | |
| 86 void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const; | |
| 87 | |
| 88 // The following methods are only used inside this class. | |
| 89 | |
| 90 // Returns the frame array index where the frame with offset is stored. | |
| 91 int get_index_from_offset(int32_t offset) const; | |
| 92 | |
| 93 void print_on(outputStream* str) const; | |
| 94 }; | |
| 95 | |
| 96 class StackMapStream : StackObj { | |
| 97 private: | |
| 98 Array<u1>* _data; | |
| 99 int _index; | |
| 100 public: | |
| 101 StackMapStream(Array<u1>* ah) | |
| 102 : _data(ah), _index(0) { | |
| 103 } | |
| 104 u1 get_u1(TRAPS) { | |
| 105 if (_data == NULL || _index >= _data->length()) { | |
| 106 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
| 107 } | |
| 108 return _data->at(_index++); | |
| 109 } | |
| 110 u2 get_u2(TRAPS) { | |
| 111 if (_data == NULL || _index >= _data->length() - 1) { | |
| 112 stackmap_format_error("access beyond the end of attribute", CHECK_0); | |
| 113 } | |
| 114 u2 res = Bytes::get_Java_u2(_data->adr_at(_index)); | |
| 115 _index += 2; | |
| 116 return res; | |
| 117 } | |
| 118 bool at_end() { | |
| 119 return (_data == NULL) || (_index == _data->length()); | |
| 120 } | |
| 121 static void stackmap_format_error(const char* msg, TRAPS); | |
| 122 }; | |
| 123 | |
| 124 class StackMapReader : StackObj { | |
| 125 private: | |
| 126 // information about the class and method | |
| 127 constantPoolHandle _cp; | |
| 128 ClassVerifier* _verifier; | |
| 129 StackMapStream* _stream; | |
| 130 char* _code_data; | |
| 131 int32_t _code_length; | |
| 132 | |
| 133 // information get from the attribute | |
| 134 int32_t _frame_count; // frame count | |
| 135 | |
| 136 int32_t chop(VerificationType* locals, int32_t length, int32_t chops); | |
| 137 VerificationType parse_verification_type(u1* flags, TRAPS); | |
| 138 void check_verification_type_array_size( | |
| 139 int32_t size, int32_t max_size, TRAPS) { | |
| 140 if (size < 0 || size > max_size) { | |
| 141 // Since this error could be caused someone rewriting the method | |
| 142 // but not knowing to update the stackmap data, we call the the | |
| 143 // verifier's error method, which may not throw an exception and | |
| 144 // failover to the old verifier instead. | |
| 145 _verifier->class_format_error( | |
| 146 "StackMapTable format error: bad type array size"); | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 enum { | |
| 151 SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247, | |
| 152 SAME_EXTENDED = 251, | |
| 153 FULL = 255 | |
| 154 }; | |
| 155 | |
| 156 public: | |
| 157 // Constructor | |
| 158 StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data, | |
| 159 int32_t code_len, TRAPS) : | |
| 160 _verifier(v), _stream(stream), | |
| 161 _code_data(code_data), _code_length(code_len) { | |
| 162 methodHandle m = v->method(); | |
| 163 if (m->has_stackmap_table()) { | |
| 164 _cp = constantPoolHandle(THREAD, m->constants()); | |
| 165 _frame_count = _stream->get_u2(CHECK); | |
| 166 } else { | |
| 167 // There's no stackmap table present. Frame count and size are 0. | |
| 168 _frame_count = 0; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 inline int32_t get_frame_count() const { return _frame_count; } | |
| 173 StackMapFrame* next(StackMapFrame* pre_frame, bool first, | |
| 174 u2 max_locals, u2 max_stack, TRAPS); | |
| 175 | |
| 176 void check_end(TRAPS) { | |
| 177 if (!_stream->at_end()) { | |
| 178 StackMapStream::stackmap_format_error("wrong attribute size", CHECK); | |
| 179 } | |
| 180 } | |
| 181 }; | |
| 182 | |
| 183 #endif // SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP |
