Thu, 24 May 2018 20:03:11 +0800
Increase MaxHeapSize for better performance on MIPS
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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_RUNTIME_RELOCATOR_HPP
32 #define SHARE_VM_RUNTIME_RELOCATOR_HPP
34 #include "interpreter/bytecodes.hpp"
35 #include "oops/method.hpp"
36 #ifdef TARGET_ARCH_x86
37 # include "bytes_x86.hpp"
38 #endif
39 #ifdef TARGET_ARCH_sparc
40 # include "bytes_sparc.hpp"
41 #endif
42 #ifdef TARGET_ARCH_zero
43 # include "bytes_zero.hpp"
44 #endif
45 #ifdef TARGET_ARCH_arm
46 # include "bytes_arm.hpp"
47 #endif
48 #ifdef TARGET_ARCH_ppc
49 # include "bytes_ppc.hpp"
50 #endif
51 #ifdef TARGET_ARCH_mips
52 # include "bytes_mips.hpp"
53 #endif
55 // This code has been converted from the 1.1E java virtual machine
56 // Thanks to the JavaTopics group for using the code
58 class ChangeItem;
60 // Callback object for code relocations
61 class RelocatorListener : public StackObj {
62 public:
63 RelocatorListener() {};
64 virtual void relocated(int bci, int delta, int new_method_size) = 0;
65 };
68 class Relocator : public ResourceObj {
69 public:
70 Relocator(methodHandle method, RelocatorListener* listener);
71 methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
73 // Callbacks from ChangeItem's
74 bool handle_code_changes();
75 bool handle_widen (int bci, int new_ilen, u_char inst_buffer[]); // handles general instructions
76 void push_jump_widen (int bci, int delta, int new_delta); // pushes jumps
77 bool handle_jump_widen (int bci, int delta); // handles jumps
78 bool handle_switch_pad (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
80 private:
81 unsigned char* _code_array;
82 int _code_array_length;
83 int _code_length;
84 unsigned char* _compressed_line_number_table;
85 int _compressed_line_number_table_size;
86 methodHandle _method;
87 u_char _overwrite[3]; // stores overwritten bytes for shrunken instructions
89 GrowableArray<ChangeItem*>* _changes;
91 unsigned char* code_array() const { return _code_array; }
92 void set_code_array(unsigned char* array) { _code_array = array; }
94 int code_length() const { return _code_length; }
95 void set_code_length(int length) { _code_length = length; }
97 int code_array_length() const { return _code_array_length; }
98 void set_code_array_length(int length) { _code_array_length = length; }
100 unsigned char* compressed_line_number_table() const { return _compressed_line_number_table; }
101 void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
103 int compressed_line_number_table_size() const { return _compressed_line_number_table_size; }
104 void set_compressed_line_number_table_size(int size) { _compressed_line_number_table_size = size; }
106 methodHandle method() const { return _method; }
107 void set_method(methodHandle method) { _method = method; }
109 // This will return a raw bytecode, which is possibly rewritten.
110 Bytecodes::Code code_at(int bci) const { return (Bytecodes::Code) code_array()[bci]; }
111 void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
113 // get and set signed integers in the code_array
114 inline int int_at(int bci) const { return Bytes::get_Java_u4(&code_array()[bci]); }
115 inline void int_at_put(int bci, int value) { Bytes::put_Java_u4(&code_array()[bci], value); }
117 // get and set signed shorts in the code_array
118 inline short short_at(int bci) const { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
119 inline void short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
121 // get the address of in the code_array
122 inline char* addr_at(int bci) const { return (char*) &code_array()[bci]; }
124 int instruction_length_at(int bci) { return Bytecodes::length_at(NULL, code_array() + bci); }
126 // Helper methods
127 int align(int n) const { return (n+3) & ~3; }
128 int code_slop_pct() const { return 25; }
129 bool is_opcode_lookupswitch(Bytecodes::Code bc);
131 // basic relocation methods
132 bool relocate_code (int bci, int ilen, int delta);
133 void change_jumps (int break_bci, int delta);
134 void change_jump (int bci, int offset, bool is_short, int break_bci, int delta);
135 void adjust_exception_table(int bci, int delta);
136 void adjust_line_no_table (int bci, int delta);
137 void adjust_local_var_table(int bci, int delta);
138 void adjust_stack_map_table(int bci, int delta);
139 int get_orig_switch_pad (int bci, bool is_lookup_switch);
140 int rc_instr_len (int bci);
141 bool expand_code_array (int delta);
143 // Callback support
144 RelocatorListener *_listener;
145 void notify(int bci, int delta, int new_code_length) {
146 if (_listener != NULL)
147 _listener->relocated(bci, delta, new_code_length);
148 }
149 };
151 #endif // SHARE_VM_RUNTIME_RELOCATOR_HPP