1 /*
2 * Copyright (c) 2004, 2019, 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 = rax; // r8 == c_rarg2 on Windows
45 static const Register robj = r9;
46 static const Register roffset = r10;
47 static const Register rcounter = r11;
48
49 // Warning: do not use rip relative addressing after the first counter load
50 // since that may scratch r10!
51
generate_fast_get_int_field0(BasicType type)52 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
53 const char *name = NULL;
54 switch (type) {
55 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
56 case T_BYTE: name = "jni_fast_GetByteField"; break;
57 case T_CHAR: name = "jni_fast_GetCharField"; break;
58 case T_SHORT: name = "jni_fast_GetShortField"; break;
59 case T_INT: name = "jni_fast_GetIntField"; break;
60 case T_LONG: name = "jni_fast_GetLongField"; break;
61 default: ShouldNotReachHere();
62 }
63 ResourceMark rm;
64 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
65 CodeBuffer cbuf(blob);
66 MacroAssembler* masm = new MacroAssembler(&cbuf);
67 address fast_entry = __ pc();
68
69 Label slow;
70
71 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
72 __ mov32 (rcounter, counter);
73 __ mov (robj, c_rarg1);
74 __ testb (rcounter, 1);
75 __ jcc (Assembler::notZero, slow);
76
77 if (JvmtiExport::can_post_field_access()) {
78 // Check to see if a field access watch has been set before we
79 // take the fast path.
80 assert_different_registers(rscratch1, robj, rcounter); // cmp32 clobbers rscratch1!
81 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
82 __ jcc(Assembler::notZero, slow);
83 }
84
85 __ mov (roffset, c_rarg2);
86 __ shrptr(roffset, 2); // offset
87
88 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
89 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
90 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
91 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
92
93 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
94 speculative_load_pclist[count] = __ pc();
95 switch (type) {
96 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
97 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
98 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
99 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
100 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
101 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
102 default: ShouldNotReachHere();
103 }
104
105 __ cmp32 (rcounter, counter);
106 __ jcc (Assembler::notEqual, slow);
107
108 __ ret (0);
109
110 slowcase_entry_pclist[count++] = __ pc();
111 __ bind (slow);
112 address slow_case_addr = NULL;
113 switch (type) {
114 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
115 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
116 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
117 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
118 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
119 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
120 default: break;
121 }
122 // tail call
123 __ jump (ExternalAddress(slow_case_addr));
124
125 __ flush ();
126
127 return fast_entry;
128 }
129
generate_fast_get_boolean_field()130 address JNI_FastGetField::generate_fast_get_boolean_field() {
131 return generate_fast_get_int_field0(T_BOOLEAN);
132 }
133
generate_fast_get_byte_field()134 address JNI_FastGetField::generate_fast_get_byte_field() {
135 return generate_fast_get_int_field0(T_BYTE);
136 }
137
generate_fast_get_char_field()138 address JNI_FastGetField::generate_fast_get_char_field() {
139 return generate_fast_get_int_field0(T_CHAR);
140 }
141
generate_fast_get_short_field()142 address JNI_FastGetField::generate_fast_get_short_field() {
143 return generate_fast_get_int_field0(T_SHORT);
144 }
145
generate_fast_get_int_field()146 address JNI_FastGetField::generate_fast_get_int_field() {
147 return generate_fast_get_int_field0(T_INT);
148 }
149
generate_fast_get_long_field()150 address JNI_FastGetField::generate_fast_get_long_field() {
151 return generate_fast_get_int_field0(T_LONG);
152 }
153
generate_fast_get_float_field0(BasicType type)154 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
155 const char *name = NULL;
156 switch (type) {
157 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
158 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
159 default: ShouldNotReachHere();
160 }
161 ResourceMark rm;
162 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
163 CodeBuffer cbuf(blob);
164 MacroAssembler* masm = new MacroAssembler(&cbuf);
165 address fast_entry = __ pc();
166
167 Label slow;
168
169 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
170 __ mov32 (rcounter, counter);
171 __ mov (robj, c_rarg1);
172 __ testb (rcounter, 1);
173 __ jcc (Assembler::notZero, slow);
174
175 if (JvmtiExport::can_post_field_access()) {
176 // Check to see if a field access watch has been set before we
177 // take the fast path.
178 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
179 __ jcc(Assembler::notZero, slow);
180 }
181
182 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
183 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
184 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
185 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
186
187 __ mov (roffset, c_rarg2);
188 __ shrptr(roffset, 2); // offset
189
190 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
191 speculative_load_pclist[count] = __ pc();
192 switch (type) {
193 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
194 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
195 default: ShouldNotReachHere();
196 }
197 __ cmp32 (rcounter, counter);
198 __ jcc (Assembler::notEqual, slow);
199
200 __ ret (0);
201
202 slowcase_entry_pclist[count++] = __ pc();
203 __ bind (slow);
204 address slow_case_addr = NULL;
205 switch (type) {
206 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
207 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
208 default: break;
209 }
210 // tail call
211 __ jump (ExternalAddress(slow_case_addr));
212
213 __ flush ();
214
215 return fast_entry;
216 }
217
generate_fast_get_float_field()218 address JNI_FastGetField::generate_fast_get_float_field() {
219 return generate_fast_get_float_field0(T_FLOAT);
220 }
221
generate_fast_get_double_field()222 address JNI_FastGetField::generate_fast_get_double_field() {
223 return generate_fast_get_float_field0(T_DOUBLE);
224 }
225