Mon, 30 Jun 2008 17:04:59 -0700
6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
Summary: experimental() flags will protect features of an experimental nature that are not supported in the regular product build. Made UseG1GC an experimental flag.
Reviewed-by: jmasa, kamg, coleenp
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // This code has been converted from the 1.1E java virtual machine |
duke@435 | 26 | // Thanks to the JavaTopics group for using the code |
duke@435 | 27 | |
duke@435 | 28 | class ChangeItem; |
duke@435 | 29 | |
duke@435 | 30 | // Callback object for code relocations |
duke@435 | 31 | class RelocatorListener : public StackObj { |
duke@435 | 32 | public: |
duke@435 | 33 | RelocatorListener() {}; |
duke@435 | 34 | virtual void relocated(int bci, int delta, int new_method_size) = 0; |
duke@435 | 35 | }; |
duke@435 | 36 | |
duke@435 | 37 | |
duke@435 | 38 | class Relocator : public ResourceObj { |
duke@435 | 39 | public: |
duke@435 | 40 | Relocator(methodHandle method, RelocatorListener* listener); |
duke@435 | 41 | methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS); |
duke@435 | 42 | |
duke@435 | 43 | // Callbacks from ChangeItem's |
duke@435 | 44 | bool handle_code_changes(); |
duke@435 | 45 | bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions |
duke@435 | 46 | void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps |
duke@435 | 47 | bool handle_jump_widen (int bci, int delta); // handles jumps |
duke@435 | 48 | bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches |
duke@435 | 49 | |
duke@435 | 50 | private: |
duke@435 | 51 | unsigned char* _code_array; |
duke@435 | 52 | int _code_array_length; |
duke@435 | 53 | int _code_length; |
duke@435 | 54 | unsigned char* _compressed_line_number_table; |
duke@435 | 55 | int _compressed_line_number_table_size; |
duke@435 | 56 | methodHandle _method; |
duke@435 | 57 | u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions |
duke@435 | 58 | |
duke@435 | 59 | GrowableArray<ChangeItem*>* _changes; |
duke@435 | 60 | |
duke@435 | 61 | unsigned char* code_array() const { return _code_array; } |
duke@435 | 62 | void set_code_array(unsigned char* array) { _code_array = array; } |
duke@435 | 63 | |
duke@435 | 64 | int code_length() const { return _code_length; } |
duke@435 | 65 | void set_code_length(int length) { _code_length = length; } |
duke@435 | 66 | |
duke@435 | 67 | int code_array_length() const { return _code_array_length; } |
duke@435 | 68 | void set_code_array_length(int length) { _code_array_length = length; } |
duke@435 | 69 | |
duke@435 | 70 | unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; } |
duke@435 | 71 | void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; } |
duke@435 | 72 | |
duke@435 | 73 | int compressed_line_number_table_size() const { return _compressed_line_number_table_size; } |
duke@435 | 74 | void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; } |
duke@435 | 75 | |
duke@435 | 76 | methodHandle method() const { return _method; } |
duke@435 | 77 | void set_method(methodHandle method) { _method = method; } |
duke@435 | 78 | |
duke@435 | 79 | // This will return a raw bytecode, which is possibly rewritten. |
duke@435 | 80 | Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; } |
duke@435 | 81 | void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; } |
duke@435 | 82 | |
duke@435 | 83 | // get and set signed integers in the code_array |
duke@435 | 84 | inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); } |
duke@435 | 85 | inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); } |
duke@435 | 86 | |
duke@435 | 87 | // get and set signed shorts in the code_array |
duke@435 | 88 | inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); } |
duke@435 | 89 | inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); } |
duke@435 | 90 | |
duke@435 | 91 | // get the address of in the code_array |
duke@435 | 92 | inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; } |
duke@435 | 93 | |
duke@435 | 94 | int instruction_length_at(int bci) { return Bytecodes::length_at(code_array() + bci); } |
duke@435 | 95 | |
duke@435 | 96 | // Helper methods |
duke@435 | 97 | int align(int n) const { return (n+3) & ~3; } |
duke@435 | 98 | int code_slop_pct() const { return 25; } |
duke@435 | 99 | bool is_opcode_lookupswitch(Bytecodes::Code bc); |
duke@435 | 100 | |
duke@435 | 101 | // basic relocation methods |
duke@435 | 102 | bool relocate_code (int bci, int ilen, int delta); |
duke@435 | 103 | void change_jumps (int break_bci, int delta); |
duke@435 | 104 | void change_jump (int bci, int offset, bool is_short, int break_bci, int delta); |
duke@435 | 105 | void adjust_exception_table(int bci, int delta); |
duke@435 | 106 | void adjust_line_no_table (int bci, int delta); |
duke@435 | 107 | void adjust_local_var_table(int bci, int delta); |
duke@435 | 108 | int get_orig_switch_pad (int bci, bool is_lookup_switch); |
duke@435 | 109 | int rc_instr_len (int bci); |
duke@435 | 110 | bool expand_code_array (int delta); |
duke@435 | 111 | |
duke@435 | 112 | // Callback support |
duke@435 | 113 | RelocatorListener *_listener; |
duke@435 | 114 | void notify(int bci, int delta, int new_code_length) { |
duke@435 | 115 | if (_listener != NULL) |
duke@435 | 116 | _listener->relocated(bci, delta, new_code_length); |
duke@435 | 117 | } |
duke@435 | 118 | }; |