| /* |
| * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_RUNTIME_RELOCATOR_HPP |
| #define SHARE_VM_RUNTIME_RELOCATOR_HPP |
| |
| #include "interpreter/bytecodes.hpp" |
| #include "oops/method.hpp" |
| #include "utilities/bytes.hpp" |
| |
| // This code has been converted from the 1.1E java virtual machine |
| // Thanks to the JavaTopics group for using the code |
| |
| class ChangeItem; |
| |
| // Callback object for code relocations |
| class RelocatorListener : public StackObj { |
| public: |
| RelocatorListener() {}; |
| virtual void relocated(int bci, int delta, int new_method_size) = 0; |
| }; |
| |
| |
| class Relocator : public ResourceObj { |
| public: |
| Relocator(const methodHandle& method, RelocatorListener* listener); |
| methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS); |
| |
| // Callbacks from ChangeItem's |
| bool handle_code_changes(); |
| bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions |
| void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps |
| bool handle_jump_widen (int bci, int delta); // handles jumps |
| bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches |
| |
| private: |
| unsigned char* _code_array; |
| int _code_array_length; |
| int _code_length; |
| unsigned char* _compressed_line_number_table; |
| int _compressed_line_number_table_size; |
| methodHandle _method; |
| u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions |
| |
| GrowableArray<ChangeItem*>* _changes; |
| |
| unsigned char* code_array() const { return _code_array; } |
| void set_code_array(unsigned char* array) { _code_array = array; } |
| |
| int code_length() const { return _code_length; } |
| void set_code_length(int length) { _code_length = length; } |
| |
| int code_array_length() const { return _code_array_length; } |
| void set_code_array_length(int length) { _code_array_length = length; } |
| |
| unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; } |
| void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; } |
| |
| int compressed_line_number_table_size() const { return _compressed_line_number_table_size; } |
| void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; } |
| |
| methodHandle method() const { return _method; } |
| void set_method(const methodHandle& method) { _method = method; } |
| |
| // This will return a raw bytecode, which is possibly rewritten. |
| Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; } |
| void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; } |
| |
| // get and set signed integers in the code_array |
| inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); } |
| inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); } |
| |
| // get and set signed shorts in the code_array |
| inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); } |
| inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); } |
| |
| // get the address of in the code_array |
| inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; } |
| |
| int instruction_length_at(int bci) { return Bytecodes::length_at(NULL, code_array() + bci); } |
| |
| // Helper methods |
| int align(int n) const { return (n+3) & ~3; } |
| int code_slop_pct() const { return 25; } |
| bool is_opcode_lookupswitch(Bytecodes::Code bc); |
| |
| // basic relocation methods |
| bool relocate_code (int bci, int ilen, int delta); |
| void change_jumps (int break_bci, int delta); |
| void change_jump (int bci, int offset, bool is_short, int break_bci, int delta); |
| void adjust_exception_table(int bci, int delta); |
| void adjust_line_no_table (int bci, int delta); |
| void adjust_local_var_table(int bci, int delta); |
| void adjust_stack_map_table(int bci, int delta); |
| int get_orig_switch_pad (int bci, bool is_lookup_switch); |
| int rc_instr_len (int bci); |
| bool expand_code_array (int delta); |
| |
| // Callback support |
| RelocatorListener *_listener; |
| void notify(int bci, int delta, int new_code_length) { |
| if (_listener != NULL) |
| _listener->relocated(bci, delta, new_code_length); |
| } |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_RELOCATOR_HPP |