1 /*
2 * Copyright (c) 2004, 2017, 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 "gc/shared/barrierSet.hpp"
28 #include "gc/shared/barrierSetAssembler.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "prims/jniFastGetField.hpp"
31 #include "prims/jvm_misc.hpp"
32 #include "runtime/safepoint.hpp"
33
34 #define __ masm->
35
36 #define BUFFER_SIZE 30*wordSize
37
38 // Common register usage:
39 // rax/xmm0: result
40 // c_rarg0: jni env
41 // c_rarg1: obj
42 // c_rarg2: jfield id
43
44 static const Register rtmp = r8;
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 = NULL;
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 __ mov (roffset, c_rarg2);
78 __ shrptr(roffset, 2); // offset
79
80 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
81 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
82 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
83 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
84
85 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
86 speculative_load_pclist[count] = __ pc();
87 switch (type) {
88 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
89 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
90 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
91 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
92 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
93 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
94 default: ShouldNotReachHere();
95 }
96
97 __ cmp32 (rcounter, counter);
98 __ jcc (Assembler::notEqual, slow);
99
100 __ ret (0);
101
102 slowcase_entry_pclist[count++] = __ pc();
103 __ bind (slow);
104 address slow_case_addr = NULL;
105 switch (type) {
106 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
107 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
108 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
109 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
110 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
111 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
112 default: break;
113 }
114 // tail call
115 __ jump (ExternalAddress(slow_case_addr));
116
117 __ flush ();
118
119 return fast_entry;
120 }
121
122 address JNI_FastGetField::generate_fast_get_boolean_field() {
123 return generate_fast_get_int_field0(T_BOOLEAN);
124 }
125
126 address JNI_FastGetField::generate_fast_get_byte_field() {
127 return generate_fast_get_int_field0(T_BYTE);
128 }
129
130 address JNI_FastGetField::generate_fast_get_char_field() {
131 return generate_fast_get_int_field0(T_CHAR);
132 }
133
134 address JNI_FastGetField::generate_fast_get_short_field() {
135 return generate_fast_get_int_field0(T_SHORT);
136 }
137
138 address JNI_FastGetField::generate_fast_get_int_field() {
139 return generate_fast_get_int_field0(T_INT);
140 }
141
142 address JNI_FastGetField::generate_fast_get_long_field() {
143 return generate_fast_get_int_field0(T_LONG);
144 }
145
146 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
147 const char *name = NULL;
148 switch (type) {
149 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
150 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
151 default: ShouldNotReachHere();
152 }
153 ResourceMark rm;
154 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
155 CodeBuffer cbuf(blob);
156 MacroAssembler* masm = new MacroAssembler(&cbuf);
157 address fast_entry = __ pc();
158
159 Label slow;
160
161 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
162 __ mov32 (rcounter, counter);
163 __ mov (robj, c_rarg1);
164 __ testb (rcounter, 1);
165 __ jcc (Assembler::notZero, slow);
166
167 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
168 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
169 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
170 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
171
172 __ mov (roffset, c_rarg2);
173 __ shrptr(roffset, 2); // offset
174
175 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
176 speculative_load_pclist[count] = __ pc();
177 switch (type) {
178 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
179 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
180 default: ShouldNotReachHere();
181 }
182 __ cmp32 (rcounter, counter);
183 __ jcc (Assembler::notEqual, slow);
184
185 __ ret (0);
186
187 slowcase_entry_pclist[count++] = __ pc();
188 __ bind (slow);
189 address slow_case_addr = NULL;
190 switch (type) {
191 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
192 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
193 default: break;
194 }
195 // tail call
196 __ jump (ExternalAddress(slow_case_addr));
197
198 __ flush ();
199
200 return fast_entry;
201 }
202
203 address JNI_FastGetField::generate_fast_get_float_field() {
204 return generate_fast_get_float_field0(T_FLOAT);
205 }
206
207 address JNI_FastGetField::generate_fast_get_double_field() {
208 return generate_fast_get_float_field0(T_DOUBLE);
209 }