1 /*
2 * Copyright (c) 2008, 2018, 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 "assembler_arm.inline.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "prims/jniFastGetField.hpp"
30 #include "prims/jvm_misc.hpp"
31 #include "runtime/safepoint.hpp"
32
33 #define __ masm->
34
35 #define BUFFER_SIZE 96
36
37 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
38 const char* name = NULL;
39 address slow_case_addr = NULL;
40 switch (type) {
41 case T_BOOLEAN:
42 name = "jni_fast_GetBooleanField";
43 slow_case_addr = jni_GetBooleanField_addr();
44 break;
45 case T_BYTE:
46 name = "jni_fast_GetByteField";
47 slow_case_addr = jni_GetByteField_addr();
48 break;
49 case T_CHAR:
50 name = "jni_fast_GetCharField";
51 slow_case_addr = jni_GetCharField_addr();
52 break;
53 case T_SHORT:
54 name = "jni_fast_GetShortField";
55 slow_case_addr = jni_GetShortField_addr();
56 break;
57 case T_INT:
58 name = "jni_fast_GetIntField";
59 slow_case_addr = jni_GetIntField_addr();
60 break;
61 case T_LONG:
62 name = "jni_fast_GetLongField";
63 slow_case_addr = jni_GetLongField_addr();
64 break;
65 case T_FLOAT:
66 name = "jni_fast_GetFloatField";
67 slow_case_addr = jni_GetFloatField_addr();
68 break;
69 case T_DOUBLE:
70 name = "jni_fast_GetDoubleField";
71 slow_case_addr = jni_GetDoubleField_addr();
72 break;
73 default:
74 ShouldNotReachHere();
75 }
76
77 // R0 - jni env
78 // R1 - object handle
79 // R2 - jfieldID
80
81 const Register Rsafepoint_counter_addr = R3;
82 const Register Robj = R1;
83 const Register Rres = R0;
84 const Register Rres_hi = R1;
85 const Register Rsafept_cnt = Rtemp;
86 const Register Rsafept_cnt2 = Rsafepoint_counter_addr;
87 const Register Rtmp1 = R3; // same as Rsafepoint_counter_addr
88 const Register Rtmp2 = R2; // same as jfieldID
89
90 assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Robj, Rres, LR);
91 assert_different_registers(Rsafept_cnt, R1, R2, Rtmp1, LR);
92 assert_different_registers(Rsafepoint_counter_addr, Rsafept_cnt, Rres, Rres_hi, Rtmp2, LR);
93 assert_different_registers(Rsafept_cnt2, Rsafept_cnt, Rres, Rres_hi, LR);
94
95 address fast_entry;
96
97 ResourceMark rm;
98 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
99 CodeBuffer cbuf(blob);
100 MacroAssembler* masm = new MacroAssembler(&cbuf);
101 fast_entry = __ pc();
102
103 // Safepoint check
104 InlinedAddress safepoint_counter_addr(SafepointSynchronize::safepoint_counter_addr());
105 Label slow_case;
106 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
107
108 __ push(RegisterSet(R0, R3)); // save incoming arguments for slow case
109
110 __ ldr_s32(Rsafept_cnt, Address(Rsafepoint_counter_addr));
111 __ tbnz(Rsafept_cnt, 0, slow_case);
112
113 __ bic(R1, R1, JNIHandles::weak_tag_mask);
114
115 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier
116 __ andr(Rtmp1, Rsafept_cnt, (unsigned)1);
117 __ ldr(Robj, Address(R1, Rtmp1));
118
119 Address field_addr;
120 if (type != T_BOOLEAN
121 && type != T_INT
122 #ifndef __ABI_HARD__
123 && type != T_FLOAT
124 #endif // !__ABI_HARD__
125 ) {
126 // Only ldr and ldrb support embedded shift, other loads do not
127 __ add(Robj, Robj, AsmOperand(R2, lsr, 2));
128 field_addr = Address(Robj);
129 } else {
130 field_addr = Address(Robj, R2, lsr, 2);
131 }
132 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
133 speculative_load_pclist[count] = __ pc();
134
135 switch (type) {
136 case T_BOOLEAN:
137 __ ldrb(Rres, field_addr);
138 break;
139 case T_BYTE:
140 __ ldrsb(Rres, field_addr);
141 break;
142 case T_CHAR:
143 __ ldrh(Rres, field_addr);
144 break;
145 case T_SHORT:
146 __ ldrsh(Rres, field_addr);
147 break;
148 case T_INT:
149 #ifndef __ABI_HARD__
150 case T_FLOAT:
151 #endif
152 __ ldr_s32(Rres, field_addr);
153 break;
154 case T_LONG:
155 #ifndef __ABI_HARD__
156 case T_DOUBLE:
157 #endif
158 // Safe to use ldrd since long and double fields are 8-byte aligned
159 __ ldrd(Rres, field_addr);
160 break;
161 #ifdef __ABI_HARD__
162 case T_FLOAT:
163 __ ldr_float(S0, field_addr);
164 break;
165 case T_DOUBLE:
166 __ ldr_double(D0, field_addr);
167 break;
168 #endif // __ABI_HARD__
169 default:
170 ShouldNotReachHere();
171 }
172
173 // Address dependency restricts memory access ordering. It's cheaper than explicit LoadLoad barrier
174 #ifdef __ABI_HARD__
175 if (type == T_FLOAT || type == T_DOUBLE) {
176 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
177 __ fmrrd(Rres, Rres_hi, D0);
178 __ eor(Rtmp2, Rres, Rres);
179 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2));
180 } else
181 #endif // __ABI_HARD__
182 {
183 __ ldr_literal(Rsafepoint_counter_addr, safepoint_counter_addr);
184 __ eor(Rtmp2, Rres, Rres);
185 __ ldr_s32(Rsafept_cnt2, Address(Rsafepoint_counter_addr, Rtmp2));
186 }
187 __ cmp(Rsafept_cnt2, Rsafept_cnt);
188 // discards saved R0 R1 R2 R3
189 __ add(SP, SP, 4 * wordSize, eq);
190 __ bx(LR, eq);
191
192 slowcase_entry_pclist[count++] = __ pc();
193
194 __ bind(slow_case);
195 __ pop(RegisterSet(R0, R3));
196 // thumb mode switch handled by MacroAssembler::jump if needed
197 __ jump(slow_case_addr, relocInfo::none, Rtemp);
198
199 __ bind_literal(safepoint_counter_addr);
200
201 __ flush();
202
203 guarantee((__ pc() - fast_entry) <= BUFFER_SIZE, "BUFFER_SIZE too small");
204
205 return fast_entry;
206 }
207
208 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
209 ShouldNotReachHere();
210 return NULL;
211 }
212
213 address JNI_FastGetField::generate_fast_get_boolean_field() {
214 return generate_fast_get_int_field0(T_BOOLEAN);
215 }
216
217 address JNI_FastGetField::generate_fast_get_byte_field() {
218 return generate_fast_get_int_field0(T_BYTE);
219 }
220
221 address JNI_FastGetField::generate_fast_get_char_field() {
222 return generate_fast_get_int_field0(T_CHAR);
223 }
224
225 address JNI_FastGetField::generate_fast_get_short_field() {
226 return generate_fast_get_int_field0(T_SHORT);
227 }
228
229 address JNI_FastGetField::generate_fast_get_int_field() {
230 return generate_fast_get_int_field0(T_INT);
231 }
232
233 address JNI_FastGetField::generate_fast_get_long_field() {
234 return generate_fast_get_int_field0(T_LONG);
235 }
236
237 address JNI_FastGetField::generate_fast_get_float_field() {
238 return generate_fast_get_int_field0(T_FLOAT);
239 }
240
241 address JNI_FastGetField::generate_fast_get_double_field() {
242 return generate_fast_get_int_field0(T_DOUBLE);
243 }