Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/stackMapTable.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2003, 2006, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
| 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 }; |