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
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 __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
83 __ testl(rax, rax);
84 __ jcc(Assembler::notZero, slow);
85 }
86
87 __ mov(rax, rcx);
88 __ andptr(rax, 1); // rax, must end up 0
89 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
90 // obj, notice rax, is 0.
91 // rdx is data dependent on rcx.
92 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
93
94 __ clear_jweak_tag(rdx);
95
96 __ movptr(rdx, Address(rdx, 0)); // *obj
97 __ shrptr (rax, 2); // offset
98
99 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
100 speculative_load_pclist[count] = __ pc();
101 switch (type) {
102 case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
103 case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
104 case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
105 case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
106 case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
107 default: ShouldNotReachHere();
108 }
109
110 Address ca1;
111 __ lea(rdx, counter);
112 __ xorptr(rdx, rax);
113 __ xorptr(rdx, rax);
114 __ cmp32(rcx, Address(rdx, 0));
115 // ca1 is the same as ca because
116 // rax, ^ counter_addr ^ rax, = address
117 // ca1 is data dependent on rax,.
118 __ jcc (Assembler::notEqual, slow);
119
120 #ifndef _WINDOWS
121 __ ret (0);
122 #else
123 // __stdcall calling convention
124 __ ret (3*wordSize);
125 #endif
126
127 slowcase_entry_pclist[count++] = __ pc();
128 __ bind (slow);
129 address slow_case_addr = NULL;
130 switch (type) {
131 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
132 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
133 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
134 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
135 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
136 default: ShouldNotReachHere();
137 }
138 // tail call
139 __ jump (ExternalAddress(slow_case_addr));
140
141 __ flush ();
142
143 #ifndef _WINDOWS
144 return fast_entry;
145 #else
146 switch (type) {
147 case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
148 case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t) fast_entry; break;
149 case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t) fast_entry; break;
150 case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t) fast_entry; break;
151 case T_INT: jni_fast_GetIntField_fp = (GetIntField_t) fast_entry; break;
152 }
153 return os::win32::fast_jni_accessor_wrapper(type);
154 #endif
155 }
156
157 address JNI_FastGetField::generate_fast_get_boolean_field() {
158 return generate_fast_get_int_field0(T_BOOLEAN);
159 }
160
161 address JNI_FastGetField::generate_fast_get_byte_field() {
162 return generate_fast_get_int_field0(T_BYTE);
163 }
164
165 address JNI_FastGetField::generate_fast_get_char_field() {
166 return generate_fast_get_int_field0(T_CHAR);
167 }
168
169 address JNI_FastGetField::generate_fast_get_short_field() {
170 return generate_fast_get_int_field0(T_SHORT);
171 }
172
173 address JNI_FastGetField::generate_fast_get_int_field() {
174 return generate_fast_get_int_field0(T_INT);
175 }
176
177 address JNI_FastGetField::generate_fast_get_long_field() {
178 const char *name = "jni_fast_GetLongField";
179 ResourceMark rm;
180 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
181 CodeBuffer cbuf(blob);
182 MacroAssembler* masm = new MacroAssembler(&cbuf);
183 address fast_entry = __ pc();
184
185 Label slow;
186
187 // stack layout: offset from rsp (in words):
188 // old rsi 0
189 // return pc 1
190 // jni env 2
191 // obj 3
192 // jfieldID 4
193
194 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
195
196 __ push (rsi);
197 __ mov32 (rcx, counter);
198 __ testb (rcx, 1);
199 __ jcc (Assembler::notZero, slow);
200
201 if (JvmtiExport::can_post_field_access()) {
202 // Check to see if a field access watch has been set before we
203 // take the fast path.
204 __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
205 __ testl(rax, rax);
206 __ jcc(Assembler::notZero, slow);
207 }
208
209 __ mov(rax, rcx);
210 __ andptr(rax, 1); // rax, must end up 0
211 __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
212 // obj, notice rax, is 0.
213 // rdx is data dependent on rcx.
214 __ movptr(rsi, Address(rsp, 4*wordSize)); // jfieldID
215
216 __ clear_jweak_tag(rdx);
217
218 __ movptr(rdx, Address(rdx, 0)); // *obj
219 __ shrptr(rsi, 2); // offset
220
221 assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
222 speculative_load_pclist[count++] = __ pc();
223 __ movptr(rax, Address(rdx, rsi, Address::times_1));
224 #ifndef _LP64
225 speculative_load_pclist[count] = __ pc();
226 __ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
227 #endif // _LP64
228
229 __ lea(rsi, counter);
230 __ xorptr(rsi, rdx);
231 __ xorptr(rsi, rax);
232 __ xorptr(rsi, rdx);
233 __ xorptr(rsi, rax);
234 __ cmp32(rcx, Address(rsi, 0));
235 // ca1 is the same as ca because
236 // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
237 // ca1 is data dependent on both rax, and rdx.
238 __ jcc (Assembler::notEqual, slow);
239
240 __ pop (rsi);
241
242 #ifndef _WINDOWS
243 __ ret (0);
244 #else
245 // __stdcall calling convention
246 __ ret (3*wordSize);
247 #endif
248
249 slowcase_entry_pclist[count-1] = __ pc();
250 slowcase_entry_pclist[count++] = __ pc();
251 __ bind (slow);
252 __ pop (rsi);
253 address slow_case_addr = jni_GetLongField_addr();;
254 // tail call
255 __ jump (ExternalAddress(slow_case_addr));
256
257 __ flush ();
258
259 #ifndef _WINDOWS
260 return fast_entry;
261 #else
262 jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;
263 return os::win32::fast_jni_accessor_wrapper(T_LONG);
264 #endif
265 }
266
267 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
268 const char *name = NULL;
269 switch (type) {
270 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
271 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
272 default: ShouldNotReachHere();
273 }
274 ResourceMark rm;
275 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
276 CodeBuffer cbuf(blob);
277 MacroAssembler* masm = new MacroAssembler(&cbuf);
278 address fast_entry = __ pc();
279
280 Label slow_with_pop, slow;
281
282 // stack layout: offset from rsp (in words):
283 // return pc 0
284 // jni env 1
285 // obj 2
286 // jfieldID 3
287
288 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
289
290 __ mov32 (rcx, counter);
291 __ testb (rcx, 1);
292 __ jcc (Assembler::notZero, slow);
293
294 if (JvmtiExport::can_post_field_access()) {
295 // Check to see if a field access watch has been set before we
296 // take the fast path.
297 __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
298 __ testl(rax, rax);
299 __ jcc(Assembler::notZero, slow);
300 }
301
302 __ mov(rax, rcx);
303 __ andptr(rax, 1); // rax, must end up 0
304 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
305 // obj, notice rax, is 0.
306 // rdx is data dependent on rcx.
307 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
308
309 __ clear_jweak_tag(rdx);
310
311 __ movptr(rdx, Address(rdx, 0)); // *obj
312 __ shrptr(rax, 2); // offset
313
314 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
315 speculative_load_pclist[count] = __ pc();
316 switch (type) {
317 #ifndef _LP64
318 case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
319 case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
320 #else
321 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
322 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
323 #endif // _LP64
324 default: ShouldNotReachHere();
325 }
326
327 Address ca1;
328 __ fst_s (Address(rsp, -4));
329 __ lea(rdx, counter);
330 __ movl (rax, Address(rsp, -4));
331 // garbage hi-order bits on 64bit are harmless.
332 __ xorptr(rdx, rax);
333 __ xorptr(rdx, rax);
334 __ cmp32(rcx, Address(rdx, 0));
335 // rax, ^ counter_addr ^ rax, = address
336 // ca1 is data dependent on the field
337 // access.
338 __ jcc (Assembler::notEqual, slow_with_pop);
339
340 #ifndef _WINDOWS
341 __ ret (0);
342 #else
343 // __stdcall calling convention
344 __ ret (3*wordSize);
345 #endif
346
347 __ bind (slow_with_pop);
348 // invalid load. pop FPU stack.
349 __ fstp_d (0);
350
351 slowcase_entry_pclist[count++] = __ pc();
352 __ bind (slow);
353 address slow_case_addr = NULL;
354 switch (type) {
355 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
356 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
357 default: ShouldNotReachHere();
358 }
359 // tail call
360 __ jump (ExternalAddress(slow_case_addr));
361
362 __ flush ();
363
364 #ifndef _WINDOWS
365 return fast_entry;
366 #else
367 switch (type) {
368 case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t) fast_entry; break;
369 case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
370 }
371 return os::win32::fast_jni_accessor_wrapper(type);
372 #endif
373 }
374
375 address JNI_FastGetField::generate_fast_get_float_field() {
376 return generate_fast_get_float_field0(T_FLOAT);
377 }
378
379 address JNI_FastGetField::generate_fast_get_double_field() {
380 return generate_fast_get_float_field0(T_DOUBLE);
381 }