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 "memory/resourceArea.hpp"
28 #include "prims/jniFastGetField.hpp"
29 #include "prims/jvm_misc.hpp"
30 #include "runtime/safepoint.hpp"
31
32 #define __ masm->
33
34 #define BUFFER_SIZE 30
35
36 #ifdef _WINDOWS
37 GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
38 GetByteField_t JNI_FastGetField::jni_fast_GetByteField_fp;
39 GetCharField_t JNI_FastGetField::jni_fast_GetCharField_fp;
40 GetShortField_t JNI_FastGetField::jni_fast_GetShortField_fp;
41 GetIntField_t JNI_FastGetField::jni_fast_GetIntField_fp;
42 GetLongField_t JNI_FastGetField::jni_fast_GetLongField_fp;
43 GetFloatField_t JNI_FastGetField::jni_fast_GetFloatField_fp;
44 GetDoubleField_t JNI_FastGetField::jni_fast_GetDoubleField_fp;
45 #endif
46
47 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
48 // between loads, which is much more efficient than lfence.
49
generate_fast_get_int_field0(BasicType type)50 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
51 const char *name = NULL;
52 switch (type) {
53 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
54 case T_BYTE: name = "jni_fast_GetByteField"; break;
55 case T_CHAR: name = "jni_fast_GetCharField"; break;
56 case T_SHORT: name = "jni_fast_GetShortField"; break;
57 case T_INT: name = "jni_fast_GetIntField"; break;
58 default: ShouldNotReachHere();
59 }
60 ResourceMark rm;
61 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
62 CodeBuffer cbuf(blob);
63 MacroAssembler* masm = new MacroAssembler(&cbuf);
64 address fast_entry = __ pc();
65
66 Label slow;
67
68 // stack layout: offset from rsp (in words):
69 // return pc 0
70 // jni env 1
71 // obj 2
72 // jfieldID 3
73
74 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
75 __ mov32 (rcx, counter);
76 __ testb (rcx, 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 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
83 __ jcc(Assembler::notZero, slow);
84 }
85
86 __ mov(rax, rcx);
87 __ andptr(rax, 1); // rax, must end up 0
88 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
89 // obj, notice rax, is 0.
90 // rdx is data dependent on rcx.
91 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
92
93 __ clear_jweak_tag(rdx);
94
95 __ movptr(rdx, Address(rdx, 0)); // *obj
96 __ shrptr (rax, 2); // offset
97
98 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
99 speculative_load_pclist[count] = __ pc();
100 switch (type) {
101 case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
102 case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
103 case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
104 case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
105 case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
106 default: ShouldNotReachHere();
107 }
108
109 Address ca1;
110 __ lea(rdx, counter);
111 __ xorptr(rdx, rax);
112 __ xorptr(rdx, rax);
113 __ cmp32(rcx, Address(rdx, 0));
114 // ca1 is the same as ca because
115 // rax, ^ counter_addr ^ rax, = address
116 // ca1 is data dependent on rax,.
117 __ jcc (Assembler::notEqual, slow);
118
119 #ifndef _WINDOWS
120 __ ret (0);
121 #else
122 // __stdcall calling convention
123 __ ret (3*wordSize);
124 #endif
125
126 slowcase_entry_pclist[count++] = __ pc();
127 __ bind (slow);
128 address slow_case_addr = NULL;
129 switch (type) {
130 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
131 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
132 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
133 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
134 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
135 default: ShouldNotReachHere();
136 }
137 // tail call
138 __ jump (ExternalAddress(slow_case_addr));
139
140 __ flush ();
141
142 #ifndef _WINDOWS
143 return fast_entry;
144 #else
145 switch (type) {
146 case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
147 case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t) fast_entry; break;
148 case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t) fast_entry; break;
149 case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t) fast_entry; break;
150 case T_INT: jni_fast_GetIntField_fp = (GetIntField_t) fast_entry; break;
151 }
152 return os::win32::fast_jni_accessor_wrapper(type);
153 #endif
154 }
155
generate_fast_get_boolean_field()156 address JNI_FastGetField::generate_fast_get_boolean_field() {
157 return generate_fast_get_int_field0(T_BOOLEAN);
158 }
159
generate_fast_get_byte_field()160 address JNI_FastGetField::generate_fast_get_byte_field() {
161 return generate_fast_get_int_field0(T_BYTE);
162 }
163
generate_fast_get_char_field()164 address JNI_FastGetField::generate_fast_get_char_field() {
165 return generate_fast_get_int_field0(T_CHAR);
166 }
167
generate_fast_get_short_field()168 address JNI_FastGetField::generate_fast_get_short_field() {
169 return generate_fast_get_int_field0(T_SHORT);
170 }
171
generate_fast_get_int_field()172 address JNI_FastGetField::generate_fast_get_int_field() {
173 return generate_fast_get_int_field0(T_INT);
174 }
175
generate_fast_get_long_field()176 address JNI_FastGetField::generate_fast_get_long_field() {
177 const char *name = "jni_fast_GetLongField";
178 ResourceMark rm;
179 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
180 CodeBuffer cbuf(blob);
181 MacroAssembler* masm = new MacroAssembler(&cbuf);
182 address fast_entry = __ pc();
183
184 Label slow;
185
186 // stack layout: offset from rsp (in words):
187 // old rsi 0
188 // return pc 1
189 // jni env 2
190 // obj 3
191 // jfieldID 4
192
193 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
194
195 __ push (rsi);
196 __ mov32 (rcx, counter);
197 __ testb (rcx, 1);
198 __ jcc (Assembler::notZero, slow);
199
200 if (JvmtiExport::can_post_field_access()) {
201 // Check to see if a field access watch has been set before we
202 // take the fast path.
203 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
204 __ jcc(Assembler::notZero, slow);
205 }
206
207 __ mov(rax, rcx);
208 __ andptr(rax, 1); // rax, must end up 0
209 __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
210 // obj, notice rax, is 0.
211 // rdx is data dependent on rcx.
212 __ movptr(rsi, Address(rsp, 4*wordSize)); // jfieldID
213
214 __ clear_jweak_tag(rdx);
215
216 __ movptr(rdx, Address(rdx, 0)); // *obj
217 __ shrptr(rsi, 2); // offset
218
219 assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
220 speculative_load_pclist[count++] = __ pc();
221 __ movptr(rax, Address(rdx, rsi, Address::times_1));
222 #ifndef _LP64
223 speculative_load_pclist[count] = __ pc();
224 __ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
225 #endif // _LP64
226
227 __ lea(rsi, counter);
228 __ xorptr(rsi, rdx);
229 __ xorptr(rsi, rax);
230 __ xorptr(rsi, rdx);
231 __ xorptr(rsi, rax);
232 __ cmp32(rcx, Address(rsi, 0));
233 // ca1 is the same as ca because
234 // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
235 // ca1 is data dependent on both rax, and rdx.
236 __ jcc (Assembler::notEqual, slow);
237
238 __ pop (rsi);
239
240 #ifndef _WINDOWS
241 __ ret (0);
242 #else
243 // __stdcall calling convention
244 __ ret (3*wordSize);
245 #endif
246
247 slowcase_entry_pclist[count-1] = __ pc();
248 slowcase_entry_pclist[count++] = __ pc();
249 __ bind (slow);
250 __ pop (rsi);
251 address slow_case_addr = jni_GetLongField_addr();;
252 // tail call
253 __ jump (ExternalAddress(slow_case_addr));
254
255 __ flush ();
256
257 #ifndef _WINDOWS
258 return fast_entry;
259 #else
260 jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;
261 return os::win32::fast_jni_accessor_wrapper(T_LONG);
262 #endif
263 }
264
generate_fast_get_float_field0(BasicType type)265 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
266 const char *name = NULL;
267 switch (type) {
268 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
269 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
270 default: ShouldNotReachHere();
271 }
272 ResourceMark rm;
273 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
274 CodeBuffer cbuf(blob);
275 MacroAssembler* masm = new MacroAssembler(&cbuf);
276 address fast_entry = __ pc();
277
278 Label slow_with_pop, slow;
279
280 // stack layout: offset from rsp (in words):
281 // return pc 0
282 // jni env 1
283 // obj 2
284 // jfieldID 3
285
286 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
287
288 __ mov32 (rcx, counter);
289 __ testb (rcx, 1);
290 __ jcc (Assembler::notZero, slow);
291
292 if (JvmtiExport::can_post_field_access()) {
293 // Check to see if a field access watch has been set before we
294 // take the fast path.
295 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
296 __ jcc(Assembler::notZero, slow);
297 }
298
299 __ mov(rax, rcx);
300 __ andptr(rax, 1); // rax, must end up 0
301 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
302 // obj, notice rax, is 0.
303 // rdx is data dependent on rcx.
304 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
305
306 __ clear_jweak_tag(rdx);
307
308 __ movptr(rdx, Address(rdx, 0)); // *obj
309 __ shrptr(rax, 2); // offset
310
311 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
312 speculative_load_pclist[count] = __ pc();
313 switch (type) {
314 #ifndef _LP64
315 case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
316 case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
317 #else
318 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
319 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
320 #endif // _LP64
321 default: ShouldNotReachHere();
322 }
323
324 Address ca1;
325 __ fst_s (Address(rsp, -4));
326 __ lea(rdx, counter);
327 __ movl (rax, Address(rsp, -4));
328 // garbage hi-order bits on 64bit are harmless.
329 __ xorptr(rdx, rax);
330 __ xorptr(rdx, rax);
331 __ cmp32(rcx, Address(rdx, 0));
332 // rax, ^ counter_addr ^ rax, = address
333 // ca1 is data dependent on the field
334 // access.
335 __ jcc (Assembler::notEqual, slow_with_pop);
336
337 #ifndef _WINDOWS
338 __ ret (0);
339 #else
340 // __stdcall calling convention
341 __ ret (3*wordSize);
342 #endif
343
344 __ bind (slow_with_pop);
345 // invalid load. pop FPU stack.
346 __ fstp_d (0);
347
348 slowcase_entry_pclist[count++] = __ pc();
349 __ bind (slow);
350 address slow_case_addr = NULL;
351 switch (type) {
352 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
353 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
354 default: ShouldNotReachHere();
355 }
356 // tail call
357 __ jump (ExternalAddress(slow_case_addr));
358
359 __ flush ();
360
361 #ifndef _WINDOWS
362 return fast_entry;
363 #else
364 switch (type) {
365 case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t) fast_entry; break;
366 case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
367 }
368 return os::win32::fast_jni_accessor_wrapper(type);
369 #endif
370 }
371
generate_fast_get_float_field()372 address JNI_FastGetField::generate_fast_get_float_field() {
373 return generate_fast_get_float_field0(T_FLOAT);
374 }
375
generate_fast_get_double_field()376 address JNI_FastGetField::generate_fast_get_double_field() {
377 return generate_fast_get_float_field0(T_DOUBLE);
378 }
379