1 /*
2 * Copyright (c) 2004, 2010, 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 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "prims/jniFastGetField.hpp"
29 #include "prims/jvm_misc.hpp"
30 #include "runtime/safepoint.hpp"
31
32 #define __ masm->
33
34 #define BUFFER_SIZE 30*wordSize
35
36 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
37 // between loads, which is more efficient than lfence.
38
39 // Common register usage:
40 // rax/xmm0: result
41 // c_rarg0: jni env
42 // c_rarg1: obj
43 // c_rarg2: jfield id
44
45 static const Register robj = r9;
46 static const Register rcounter = r10;
47 static const Register roffset = r11;
48 static const Register rcounter_addr = r11;
49
50 // Warning: do not use rip relative addressing after the first counter load
51 // since that may scratch r10!
52
53 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
54 const char *name;
55 switch (type) {
56 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
57 case T_BYTE: name = "jni_fast_GetByteField"; break;
58 case T_CHAR: name = "jni_fast_GetCharField"; break;
59 case T_SHORT: name = "jni_fast_GetShortField"; break;
60 case T_INT: name = "jni_fast_GetIntField"; break;
61 case T_LONG: name = "jni_fast_GetLongField"; break;
62 default: ShouldNotReachHere();
63 }
64 ResourceMark rm;
65 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
66 CodeBuffer cbuf(blob);
67 MacroAssembler* masm = new MacroAssembler(&cbuf);
68 address fast_entry = __ pc();
69
70 Label slow;
71
72 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
73 __ mov32 (rcounter, counter);
74 __ mov (robj, c_rarg1);
75 __ testb (rcounter, 1);
76 __ jcc (Assembler::notZero, slow);
77 if (os::is_MP()) {
78 __ xorptr(robj, rcounter);
79 __ xorptr(robj, rcounter); // obj, since
80 // robj ^ rcounter ^ rcounter == robj
81 // robj is data dependent on rcounter.
82 }
83 __ movptr(robj, Address(robj, 0)); // *obj
84 oopDesc::bs()->interpreter_read_barrier(masm, robj);
85 __ mov (roffset, c_rarg2);
86 __ shrptr(roffset, 2); // offset
87
88 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
89 speculative_load_pclist[count] = __ pc();
90 switch (type) {
91 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
92 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
93 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
94 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
95 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
96 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
97 default: ShouldNotReachHere();
98 }
99
100 if (os::is_MP()) {
101 __ lea(rcounter_addr, counter);
102 // ca is data dependent on rax.
103 __ xorptr(rcounter_addr, rax);
104 __ xorptr(rcounter_addr, rax);
105 __ cmpl (rcounter, Address(rcounter_addr, 0));
106 } else {
107 __ cmp32 (rcounter, counter);
108 }
109 __ jcc (Assembler::notEqual, slow);
110
111 __ ret (0);
112
113 slowcase_entry_pclist[count++] = __ pc();
114 __ bind (slow);
115 address slow_case_addr;
116 switch (type) {
117 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
118 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
119 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
120 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
121 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
122 case T_LONG: slow_case_addr = jni_GetLongField_addr();
123 }
124 // tail call
125 __ jump (ExternalAddress(slow_case_addr));
126
127 __ flush ();
128
129 return fast_entry;
130 }
131
132 address JNI_FastGetField::generate_fast_get_boolean_field() {
133 return generate_fast_get_int_field0(T_BOOLEAN);
134 }
135
136 address JNI_FastGetField::generate_fast_get_byte_field() {
137 return generate_fast_get_int_field0(T_BYTE);
138 }
139
140 address JNI_FastGetField::generate_fast_get_char_field() {
141 return generate_fast_get_int_field0(T_CHAR);
142 }
143
144 address JNI_FastGetField::generate_fast_get_short_field() {
145 return generate_fast_get_int_field0(T_SHORT);
146 }
147
148 address JNI_FastGetField::generate_fast_get_int_field() {
149 return generate_fast_get_int_field0(T_INT);
150 }
151
152 address JNI_FastGetField::generate_fast_get_long_field() {
153 return generate_fast_get_int_field0(T_LONG);
154 }
155
156 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
157 const char *name;
158 switch (type) {
159 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
160 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
161 default: ShouldNotReachHere();
162 }
163 ResourceMark rm;
164 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
165 CodeBuffer cbuf(blob);
166 MacroAssembler* masm = new MacroAssembler(&cbuf);
167 address fast_entry = __ pc();
168
169 Label slow;
170
171 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
172 __ mov32 (rcounter, counter);
173 __ mov (robj, c_rarg1);
174 __ testb (rcounter, 1);
175 __ jcc (Assembler::notZero, slow);
176 if (os::is_MP()) {
177 __ xorptr(robj, rcounter);
178 __ xorptr(robj, rcounter); // obj, since
179 // robj ^ rcounter ^ rcounter == robj
180 // robj is data dependent on rcounter.
181 }
182 __ movptr(robj, Address(robj, 0)); // *obj
183 oopDesc::bs()->interpreter_read_barrier(masm, robj);
184 __ mov (roffset, c_rarg2);
185 __ shrptr(roffset, 2); // offset
186
187 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
188 speculative_load_pclist[count] = __ pc();
189 switch (type) {
190 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
191 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
192 default: ShouldNotReachHere();
193 }
194
195 if (os::is_MP()) {
196 __ lea(rcounter_addr, counter);
197 __ movdq (rax, xmm0);
198 // counter address is data dependent on xmm0.
199 __ xorptr(rcounter_addr, rax);
200 __ xorptr(rcounter_addr, rax);
201 __ cmpl (rcounter, Address(rcounter_addr, 0));
202 } else {
203 __ cmp32 (rcounter, counter);
204 }
205 __ jcc (Assembler::notEqual, slow);
206
207 __ ret (0);
208
209 slowcase_entry_pclist[count++] = __ pc();
210 __ bind (slow);
211 address slow_case_addr;
212 switch (type) {
213 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
214 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr();
215 }
216 // tail call
217 __ jump (ExternalAddress(slow_case_addr));
218
219 __ flush ();
220
221 return fast_entry;
222 }
223
224 address JNI_FastGetField::generate_fast_get_float_field() {
225 return generate_fast_get_float_field0(T_FLOAT);
226 }
227
228 address JNI_FastGetField::generate_fast_get_double_field() {
229 return generate_fast_get_float_field0(T_DOUBLE);
230 }