1 /*
2 * Copyright (c) 2004, 2024, 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 "runtime/jfieldIDWorkaround.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/safepoint.hpp"
36
37 #define __ masm->
38
39 #define BUFFER_SIZE 40*wordSize
40
41 // Common register usage:
42 // rax/xmm0: result
43 // c_rarg0: jni env
44 // c_rarg1: obj
45 // c_rarg2: jfield id
46
47 static const Register rtmp = rax; // r8 == c_rarg2 on Windows
48 static const Register robj = r9;
49 static const Register roffset = r10;
50 static const Register rcounter = r11;
51
52 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
53 const char *name = nullptr;
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 take the fast path.
79 assert_different_registers(rscratch1, robj, rcounter);
80 __ cmp32(ExternalAddress(JvmtiExport::get_field_access_count_addr()), 0, rscratch1);
81 __ jcc(Assembler::notZero, slow);
82 }
83
84 __ mov (roffset, c_rarg2);
85 __ shrptr(roffset, jfieldIDWorkaround::offset_shift); // offset
86
87 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
88 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
89 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
90 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
91
92 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
93 speculative_load_pclist[count] = __ pc();
94 switch (type) {
95 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
96 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
97 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
98 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
99 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
100 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
101 default: ShouldNotReachHere();
102 }
103
104 __ cmp32 (rcounter, counter, rscratch1);
105 __ jcc (Assembler::notEqual, slow);
106
107 __ ret (0);
108
109 slowcase_entry_pclist[count++] = __ pc();
110 __ bind (slow);
111 address slow_case_addr = nullptr;
112 switch (type) {
113 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
114 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
115 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
116 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
117 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
118 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
119 default: break;
120 }
121 // tail call
122 __ jump (RuntimeAddress(slow_case_addr), rscratch1);
123
124 __ flush ();
125
126 return fast_entry;
127 }
128
129 address JNI_FastGetField::generate_fast_get_boolean_field() {
130 return generate_fast_get_int_field0(T_BOOLEAN);
131 }
132
133 address JNI_FastGetField::generate_fast_get_byte_field() {
134 return generate_fast_get_int_field0(T_BYTE);
135 }
136
137 address JNI_FastGetField::generate_fast_get_char_field() {
138 return generate_fast_get_int_field0(T_CHAR);
139 }
140
141 address JNI_FastGetField::generate_fast_get_short_field() {
142 return generate_fast_get_int_field0(T_SHORT);
143 }
144
145 address JNI_FastGetField::generate_fast_get_int_field() {
146 return generate_fast_get_int_field0(T_INT);
147 }
148
149 address JNI_FastGetField::generate_fast_get_long_field() {
150 return generate_fast_get_int_field0(T_LONG);
151 }
152
153 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
154 const char *name = nullptr;
155 switch (type) {
156 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
157 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
158 default: ShouldNotReachHere();
159 }
160 ResourceMark rm;
161 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
162 CodeBuffer cbuf(blob);
163 MacroAssembler* masm = new MacroAssembler(&cbuf);
164 address fast_entry = __ pc();
165
166 Label slow;
167
168 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
169 __ mov32 (rcounter, counter);
170 __ mov (robj, c_rarg1);
171 __ testb (rcounter, 1);
172 __ jcc (Assembler::notZero, slow);
173
174 if (JvmtiExport::can_post_field_access()) {
175 // Check to see if a field access watch has been set before we
176 // take the fast path.
177 __ cmp32(ExternalAddress(JvmtiExport::get_field_access_count_addr()), 0, rscratch1);
178 __ jcc(Assembler::notZero, slow);
179 }
180
181 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
182 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
183 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
184 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
185
186 __ mov (roffset, c_rarg2);
187 __ shrptr(roffset, jfieldIDWorkaround::offset_shift); // offset
188
189 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
190 speculative_load_pclist[count] = __ pc();
191 switch (type) {
192 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
193 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
194 default: ShouldNotReachHere();
195 }
196 __ cmp32 (rcounter, counter, rscratch1);
197 __ jcc (Assembler::notEqual, slow);
198
199 __ ret (0);
200
201 slowcase_entry_pclist[count++] = __ pc();
202 __ bind (slow);
203 address slow_case_addr = nullptr;
204 switch (type) {
205 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
206 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
207 default: break;
208 }
209 // tail call
210 __ jump (RuntimeAddress(slow_case_addr), rscratch1);
211
212 __ flush ();
213
214 return fast_entry;
215 }
216
217 address JNI_FastGetField::generate_fast_get_float_field() {
218 return generate_fast_get_float_field0(T_FLOAT);
219 }
220
221 address JNI_FastGetField::generate_fast_get_double_field() {
222 return generate_fast_get_float_field0(T_DOUBLE);
223 }