1 /*
2 * Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.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 30*wordSize
36
37 // Instead of issuing a LoadLoad barrier we create an address
38 // dependency between loads; this might be more efficient.
39
40 // Common register usage:
41 // r0/v0: result
42 // c_rarg0: jni env
43 // c_rarg1: obj
44 // c_rarg2: jfield id
45
46 static const Register robj = r3;
47 static const Register rcounter = r4;
48 static const Register roffset = r5;
49 static const Register rcounter_addr = r6;
50 static const Register result = r7;
51
52 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
53 const char *name;
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 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
62 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
63 default: ShouldNotReachHere();
64 name = NULL; // unreachable
65 }
66 ResourceMark rm;
67 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
68 CodeBuffer cbuf(blob);
69 MacroAssembler* masm = new MacroAssembler(&cbuf);
70 address fast_entry = __ pc();
71
72 Label slow;
73
74 unsigned long offset;
75 __ adrp(rcounter_addr,
76 SafepointSynchronize::safepoint_counter_addr(), offset);
77 Address safepoint_counter_addr(rcounter_addr, offset);
78 __ ldrw(rcounter, safepoint_counter_addr);
79 __ andw(rscratch1, rcounter, 1);
80 __ cbnzw(rscratch1, slow);
81 __ eor(robj, c_rarg1, rcounter);
82 __ eor(robj, robj, rcounter); // obj, since
83 // robj ^ rcounter ^ rcounter == robj
84 // robj is address dependent on rcounter.
85
86 // If mask changes we need to ensure that the inverse is still encodable as an immediate
87 STATIC_ASSERT(JNIHandles::weak_tag_mask == 1);
88 __ andr(robj, robj, ~JNIHandles::weak_tag_mask);
89
90 __ ldr(robj, Address(robj, 0)); // *obj
91 __ lsr(roffset, c_rarg2, 2); // offset
92
93 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
94 speculative_load_pclist[count] = __ pc(); // Used by the segfault handler
95 switch (type) {
96 case T_BOOLEAN: __ ldrb (result, Address(robj, roffset)); break;
97 case T_BYTE: __ ldrsb (result, Address(robj, roffset)); break;
98 case T_CHAR: __ ldrh (result, Address(robj, roffset)); break;
99 case T_SHORT: __ ldrsh (result, Address(robj, roffset)); break;
100 case T_FLOAT: __ ldrw (result, Address(robj, roffset)); break;
101 case T_INT: __ ldrsw (result, Address(robj, roffset)); break;
102 case T_DOUBLE:
103 case T_LONG: __ ldr (result, Address(robj, roffset)); break;
104 default: ShouldNotReachHere();
105 }
106
107 // counter_addr is address dependent on result.
108 __ eor(rcounter_addr, rcounter_addr, result);
109 __ eor(rcounter_addr, rcounter_addr, result);
110 __ ldrw(rscratch1, safepoint_counter_addr);
111 __ cmpw(rcounter, rscratch1);
112 __ br (Assembler::NE, slow);
113
114 switch (type) {
115 case T_FLOAT: __ fmovs(v0, result); break;
116 case T_DOUBLE: __ fmovd(v0, result); break;
117 default: __ mov(r0, result); break;
118 }
119 __ ret(lr);
120
121 slowcase_entry_pclist[count++] = __ pc();
122 __ bind(slow);
123 address slow_case_addr;
124 switch (type) {
125 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
126 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
127 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
128 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
129 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
130 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
131 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
132 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
133 default: ShouldNotReachHere();
134 slow_case_addr = NULL; // unreachable
135 }
136
137 {
138 __ enter();
139 __ lea(rscratch1, ExternalAddress(slow_case_addr));
140 __ blr(rscratch1);
141 __ maybe_isb();
142 __ leave();
143 __ ret(lr);
144 }
145 __ flush ();
146
147 return fast_entry;
148 }
149
150 address JNI_FastGetField::generate_fast_get_boolean_field() {
151 return generate_fast_get_int_field0(T_BOOLEAN);
152 }
153
154 address JNI_FastGetField::generate_fast_get_byte_field() {
155 return generate_fast_get_int_field0(T_BYTE);
156 }
157
158 address JNI_FastGetField::generate_fast_get_char_field() {
159 return generate_fast_get_int_field0(T_CHAR);
160 }
161
162 address JNI_FastGetField::generate_fast_get_short_field() {
163 return generate_fast_get_int_field0(T_SHORT);
164 }
165
166 address JNI_FastGetField::generate_fast_get_int_field() {
167 return generate_fast_get_int_field0(T_INT);
168 }
169
170 address JNI_FastGetField::generate_fast_get_long_field() {
171 return generate_fast_get_int_field0(T_LONG);
172 }
173
174 address JNI_FastGetField::generate_fast_get_float_field() {
175 return generate_fast_get_int_field0(T_FLOAT);
176 }
177
178 address JNI_FastGetField::generate_fast_get_double_field() {
179 return generate_fast_get_int_field0(T_DOUBLE);
180 }
181