1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/relocator.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,118 @@
1.4 +/*
1.5 + * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// This code has been converted from the 1.1E java virtual machine
1.29 +// Thanks to the JavaTopics group for using the code
1.30 +
1.31 +class ChangeItem;
1.32 +
1.33 +// Callback object for code relocations
1.34 +class RelocatorListener : public StackObj {
1.35 + public:
1.36 + RelocatorListener() {};
1.37 + virtual void relocated(int bci, int delta, int new_method_size) = 0;
1.38 +};
1.39 +
1.40 +
1.41 +class Relocator : public ResourceObj {
1.42 + public:
1.43 + Relocator(methodHandle method, RelocatorListener* listener);
1.44 + methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
1.45 +
1.46 + // Callbacks from ChangeItem's
1.47 + bool handle_code_changes();
1.48 + bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions
1.49 + void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps
1.50 + bool handle_jump_widen (int bci, int delta); // handles jumps
1.51 + bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
1.52 +
1.53 + private:
1.54 + unsigned char* _code_array;
1.55 + int _code_array_length;
1.56 + int _code_length;
1.57 + unsigned char* _compressed_line_number_table;
1.58 + int _compressed_line_number_table_size;
1.59 + methodHandle _method;
1.60 + u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions
1.61 +
1.62 + GrowableArray<ChangeItem*>* _changes;
1.63 +
1.64 + unsigned char* code_array() const { return _code_array; }
1.65 + void set_code_array(unsigned char* array) { _code_array = array; }
1.66 +
1.67 + int code_length() const { return _code_length; }
1.68 + void set_code_length(int length) { _code_length = length; }
1.69 +
1.70 + int code_array_length() const { return _code_array_length; }
1.71 + void set_code_array_length(int length) { _code_array_length = length; }
1.72 +
1.73 + unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; }
1.74 + void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
1.75 +
1.76 + int compressed_line_number_table_size() const { return _compressed_line_number_table_size; }
1.77 + void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; }
1.78 +
1.79 + methodHandle method() const { return _method; }
1.80 + void set_method(methodHandle method) { _method = method; }
1.81 +
1.82 + // This will return a raw bytecode, which is possibly rewritten.
1.83 + Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; }
1.84 + void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
1.85 +
1.86 + // get and set signed integers in the code_array
1.87 + inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); }
1.88 + inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); }
1.89 +
1.90 + // get and set signed shorts in the code_array
1.91 + inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
1.92 + inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
1.93 +
1.94 + // get the address of in the code_array
1.95 + inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; }
1.96 +
1.97 + int instruction_length_at(int bci) { return Bytecodes::length_at(code_array() + bci); }
1.98 +
1.99 + // Helper methods
1.100 + int align(int n) const { return (n+3) & ~3; }
1.101 + int code_slop_pct() const { return 25; }
1.102 + bool is_opcode_lookupswitch(Bytecodes::Code bc);
1.103 +
1.104 + // basic relocation methods
1.105 + bool relocate_code (int bci, int ilen, int delta);
1.106 + void change_jumps (int break_bci, int delta);
1.107 + void change_jump (int bci, int offset, bool is_short, int break_bci, int delta);
1.108 + void adjust_exception_table(int bci, int delta);
1.109 + void adjust_line_no_table (int bci, int delta);
1.110 + void adjust_local_var_table(int bci, int delta);
1.111 + int get_orig_switch_pad (int bci, bool is_lookup_switch);
1.112 + int rc_instr_len (int bci);
1.113 + bool expand_code_array (int delta);
1.114 +
1.115 + // Callback support
1.116 + RelocatorListener *_listener;
1.117 + void notify(int bci, int delta, int new_code_length) {
1.118 + if (_listener != NULL)
1.119 + _listener->relocated(bci, delta, new_code_length);
1.120 + }
1.121 +};
