diff -r 000000000000 -r f90c822e73f8 src/share/vm/runtime/relocator.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/relocator.hpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,142 @@ +/* + * Copyright (c) 1997, 2012, 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" +#ifdef TARGET_ARCH_x86 +# include "bytes_x86.hpp" +#endif +#ifdef TARGET_ARCH_sparc +# include "bytes_sparc.hpp" +#endif +#ifdef TARGET_ARCH_zero +# include "bytes_zero.hpp" +#endif +#ifdef TARGET_ARCH_arm +# include "bytes_arm.hpp" +#endif +#ifdef TARGET_ARCH_ppc +# include "bytes_ppc.hpp" +#endif + +// 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(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* _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(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