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comparison: src/share/vm/runtime/relocator.hpp
src/share/vm/runtime/relocator.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 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_RUNTIME_RELOCATOR_HPP | |
| 26 #define SHARE_VM_RUNTIME_RELOCATOR_HPP | |
| 27 | |
| 28 #include "interpreter/bytecodes.hpp" | |
| 29 #include "oops/method.hpp" | |
| 30 #ifdef TARGET_ARCH_x86 | |
| 31 # include "bytes_x86.hpp" | |
| 32 #endif | |
| 33 #ifdef TARGET_ARCH_sparc | |
| 34 # include "bytes_sparc.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_ARCH_zero | |
| 37 # include "bytes_zero.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_ARCH_arm | |
| 40 # include "bytes_arm.hpp" | |
| 41 #endif | |
| 42 #ifdef TARGET_ARCH_ppc | |
| 43 # include "bytes_ppc.hpp" | |
| 44 #endif | |
| 45 | |
| 46 // This code has been converted from the 1.1E java virtual machine | |
| 47 // Thanks to the JavaTopics group for using the code | |
| 48 | |
| 49 class ChangeItem; | |
| 50 | |
| 51 // Callback object for code relocations | |
| 52 class RelocatorListener : public StackObj { | |
| 53 public: | |
| 54 RelocatorListener() {}; | |
| 55 virtual void relocated(int bci, int delta, int new_method_size) = 0; | |
| 56 }; | |
| 57 | |
| 58 | |
| 59 class Relocator : public ResourceObj { | |
| 60 public: | |
| 61 Relocator(methodHandle method, RelocatorListener* listener); | |
| 62 methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS); | |
| 63 | |
| 64 // Callbacks from ChangeItem's | |
| 65 bool handle_code_changes(); | |
| 66 bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions | |
| 67 void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps | |
| 68 bool handle_jump_widen (int bci, int delta); // handles jumps | |
| 69 bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches | |
| 70 | |
| 71 private: | |
| 72 unsigned char* _code_array; | |
| 73 int _code_array_length; | |
| 74 int _code_length; | |
| 75 unsigned char* _compressed_line_number_table; | |
| 76 int _compressed_line_number_table_size; | |
| 77 methodHandle _method; | |
| 78 u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions | |
| 79 | |
| 80 GrowableArray<ChangeItem*>* _changes; | |
| 81 | |
| 82 unsigned char* code_array() const { return _code_array; } | |
| 83 void set_code_array(unsigned char* array) { _code_array = array; } | |
| 84 | |
| 85 int code_length() const { return _code_length; } | |
| 86 void set_code_length(int length) { _code_length = length; } | |
| 87 | |
| 88 int code_array_length() const { return _code_array_length; } | |
| 89 void set_code_array_length(int length) { _code_array_length = length; } | |
| 90 | |
| 91 unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; } | |
| 92 void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; } | |
| 93 | |
| 94 int compressed_line_number_table_size() const { return _compressed_line_number_table_size; } | |
| 95 void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; } | |
| 96 | |
| 97 methodHandle method() const { return _method; } | |
| 98 void set_method(methodHandle method) { _method = method; } | |
| 99 | |
| 100 // This will return a raw bytecode, which is possibly rewritten. | |
| 101 Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; } | |
| 102 void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; } | |
| 103 | |
| 104 // get and set signed integers in the code_array | |
| 105 inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); } | |
| 106 inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); } | |
| 107 | |
| 108 // get and set signed shorts in the code_array | |
| 109 inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); } | |
| 110 inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); } | |
| 111 | |
| 112 // get the address of in the code_array | |
| 113 inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; } | |
| 114 | |
| 115 int instruction_length_at(int bci) { return Bytecodes::length_at(NULL, code_array() + bci); } | |
| 116 | |
| 117 // Helper methods | |
| 118 int align(int n) const { return (n+3) & ~3; } | |
| 119 int code_slop_pct() const { return 25; } | |
| 120 bool is_opcode_lookupswitch(Bytecodes::Code bc); | |
| 121 | |
| 122 // basic relocation methods | |
| 123 bool relocate_code (int bci, int ilen, int delta); | |
| 124 void change_jumps (int break_bci, int delta); | |
| 125 void change_jump (int bci, int offset, bool is_short, int break_bci, int delta); | |
| 126 void adjust_exception_table(int bci, int delta); | |
| 127 void adjust_line_no_table (int bci, int delta); | |
| 128 void adjust_local_var_table(int bci, int delta); | |
| 129 void adjust_stack_map_table(int bci, int delta); | |
| 130 int get_orig_switch_pad (int bci, bool is_lookup_switch); | |
| 131 int rc_instr_len (int bci); | |
| 132 bool expand_code_array (int delta); | |
| 133 | |
| 134 // Callback support | |
| 135 RelocatorListener *_listener; | |
| 136 void notify(int bci, int delta, int new_code_length) { | |
| 137 if (_listener != NULL) | |
| 138 _listener->relocated(bci, delta, new_code_length); | |
| 139 } | |
| 140 }; | |
| 141 | |
| 142 #endif // SHARE_VM_RUNTIME_RELOCATOR_HPP |
