1 /*
2 * Copyright (c) 2004, 2020, 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 "code/codeBlob.hpp"
28 #include "gc/shared/barrierSet.hpp"
29 #include "gc/shared/barrierSetAssembler.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "prims/jniFastGetField.hpp"
32 #include "prims/jvm_misc.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/safepoint.hpp"
35
36 #define __ masm->
37
38 #define BUFFER_SIZE 30*wordSize
39
40 // Common register usage:
41 // rax/xmm0: result
42 // c_rarg0: jni env
43 // c_rarg1: obj
44 // c_rarg2: jfield id
45
46 static const Register rtmp = rax; // r8 == c_rarg2 on Windows
47 static const Register robj = r9;
48 static const Register roffset = r10;
49 static const Register rcounter = r11;
50
51 // Warning: do not use rip relative addressing after the first counter load
52 // since that may scratch r10!
53
54 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
55 const char *name = NULL;
56 switch (type) {
57 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
58 case T_BYTE: name = "jni_fast_GetByteField"; break;
59 case T_CHAR: name = "jni_fast_GetCharField"; break;
60 case T_SHORT: name = "jni_fast_GetShortField"; break;
61 case T_INT: name = "jni_fast_GetIntField"; break;
62 case T_LONG: name = "jni_fast_GetLongField"; break;
63 default: ShouldNotReachHere();
64 }
65 ResourceMark rm;
66 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
67 CodeBuffer cbuf(blob);
68 MacroAssembler* masm = new MacroAssembler(&cbuf);
69 address fast_entry = __ pc();
70
71 Label slow;
72
73 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
74 __ mov32 (rcounter, counter);
75 __ mov (robj, c_rarg1);
76 __ testb (rcounter, 1);
77 __ jcc (Assembler::notZero, slow);
78
79 if (JvmtiExport::can_post_field_access()) {
80 // Check to see if a field access watch has been set before we
81 // take the fast path.
82 assert_different_registers(rscratch1, robj, rcounter); // cmp32 clobbers rscratch1!
83 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
84 __ jcc(Assembler::notZero, slow);
85 }
86
87 __ mov (roffset, c_rarg2);
88 __ shrptr(roffset, 2); // offset
89
90 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
91 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
92 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
93 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
94
95 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
96 speculative_load_pclist[count] = __ pc();
97 switch (type) {
98 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
99 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
100 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
101 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
102 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
103 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
104 default: ShouldNotReachHere();
105 }
106
107 __ cmp32 (rcounter, counter);
108 __ jcc (Assembler::notEqual, slow);
109
110 __ ret (0);
111
112 slowcase_entry_pclist[count++] = __ pc();
113 __ bind (slow);
114 address slow_case_addr = NULL;
115 switch (type) {
116 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
117 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
118 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
119 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
120 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
121 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
122 default: break;
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 = NULL;
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
177 if (JvmtiExport::can_post_field_access()) {
178 // Check to see if a field access watch has been set before we
179 // take the fast path.
180 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
181 __ jcc(Assembler::notZero, slow);
182 }
183
184 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
185 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
186 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
187 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
188
189 __ mov (roffset, c_rarg2);
190 __ shrptr(roffset, 2); // offset
191
192 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
193 speculative_load_pclist[count] = __ pc();
194 switch (type) {
195 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
196 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
197 default: ShouldNotReachHere();
198 }
199 __ cmp32 (rcounter, counter);
200 __ jcc (Assembler::notEqual, slow);
201
202 __ ret (0);
203
204 slowcase_entry_pclist[count++] = __ pc();
205 __ bind (slow);
206 address slow_case_addr = NULL;
207 switch (type) {
208 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
209 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
210 default: break;
211 }
212 // tail call
213 __ jump (ExternalAddress(slow_case_addr));
214
215 __ flush ();
216
217 return fast_entry;
218 }
219
220 address JNI_FastGetField::generate_fast_get_float_field() {
221 return generate_fast_get_float_field0(T_FLOAT);
222 }
223
224 address JNI_FastGetField::generate_fast_get_double_field() {
225 return generate_fast_get_float_field0(T_DOUBLE);
226 }