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/jfieldIDWorkaround.hpp"
33 #include "runtime/safepoint.hpp"
34
35 #define __ masm->
36
37 #define BUFFER_SIZE 30*wordSize
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 rtmp = rax; // r8 == c_rarg2 on Windows
46 static const Register robj = r9;
47 static const Register roffset = r10;
48 static const Register rcounter = 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
78 if (JvmtiExport::can_post_field_access()) {
79 // Check to see if a field access watch has been set before we
80 // take the fast path.
81 assert_different_registers(rscratch1, robj, rcounter); // cmp32 clobbers rscratch1!
82 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
83 __ jcc(Assembler::notZero, slow);
84 }
85
86 __ mov (roffset, c_rarg2);
87 __ shrptr(roffset, jfieldIDWorkaround::offset_shift); // offset
88
89 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
90 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
91 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
92 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
93
94 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
95 speculative_load_pclist[count] = __ pc();
96 switch (type) {
97 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
98 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
99 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
100 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
101 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
102 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
103 default: ShouldNotReachHere();
104 }
105
106 __ cmp32 (rcounter, counter);
107 __ jcc (Assembler::notEqual, slow);
108
109 __ ret (0);
110
111 slowcase_entry_pclist[count++] = __ pc();
112 __ bind (slow);
113 address slow_case_addr = NULL;
114 switch (type) {
115 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
116 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
117 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
118 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
119 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
120 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
121 default: break;
122 }
123 // tail call
124 __ jump (ExternalAddress(slow_case_addr));
125
126 __ flush ();
127
128 return fast_entry;
129 }
130
131 address JNI_FastGetField::generate_fast_get_boolean_field() {
132 return generate_fast_get_int_field0(T_BOOLEAN);
133 }
134
135 address JNI_FastGetField::generate_fast_get_byte_field() {
136 return generate_fast_get_int_field0(T_BYTE);
137 }
138
139 address JNI_FastGetField::generate_fast_get_char_field() {
140 return generate_fast_get_int_field0(T_CHAR);
141 }
142
143 address JNI_FastGetField::generate_fast_get_short_field() {
144 return generate_fast_get_int_field0(T_SHORT);
145 }
146
147 address JNI_FastGetField::generate_fast_get_int_field() {
148 return generate_fast_get_int_field0(T_INT);
149 }
150
151 address JNI_FastGetField::generate_fast_get_long_field() {
152 return generate_fast_get_int_field0(T_LONG);
153 }
154
155 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
156 const char *name = NULL;
157 switch (type) {
158 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
159 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
160 default: ShouldNotReachHere();
161 }
162 ResourceMark rm;
163 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
164 CodeBuffer cbuf(blob);
165 MacroAssembler* masm = new MacroAssembler(&cbuf);
166 address fast_entry = __ pc();
167
168 Label slow;
169
170 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
171 __ mov32 (rcounter, counter);
172 __ mov (robj, c_rarg1);
173 __ testb (rcounter, 1);
174 __ jcc (Assembler::notZero, slow);
175
176 if (JvmtiExport::can_post_field_access()) {
177 // Check to see if a field access watch has been set before we
178 // take the fast path.
179 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
180 __ jcc(Assembler::notZero, slow);
181 }
182
183 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
184 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
185 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
186 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
187
188 __ mov (roffset, c_rarg2);
189 __ shrptr(roffset, jfieldIDWorkaround::offset_shift); // offset
190
191 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
192 speculative_load_pclist[count] = __ pc();
193 switch (type) {
194 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
195 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
196 default: ShouldNotReachHere();
197 }
198 __ cmp32 (rcounter, counter);
199 __ jcc (Assembler::notEqual, slow);
200
201 __ ret (0);
202
203 slowcase_entry_pclist[count++] = __ pc();
204 __ bind (slow);
205 address slow_case_addr = NULL;
206 switch (type) {
207 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
208 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
209 default: break;
210 }
211 // tail call
212 __ jump (ExternalAddress(slow_case_addr));
213
214 __ flush ();
215
216 return fast_entry;
217 }
218
219 address JNI_FastGetField::generate_fast_get_float_field() {
220 return generate_fast_get_float_field0(T_FLOAT);
221 }
222
223 address JNI_FastGetField::generate_fast_get_double_field() {
224 return generate_fast_get_float_field0(T_DOUBLE);
225 }