1 /*
2 * Copyright (c) 2004, 2020, 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 "prims/jvmtiExport.hpp"
31 #include "runtime/safepoint.hpp"
32 #include "runtime/stubRoutines.hpp"
33
34 #define __ masm->
35
36 #define BUFFER_SIZE 30
37
38 #ifdef _WINDOWS
39 GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
40 GetByteField_t JNI_FastGetField::jni_fast_GetByteField_fp;
41 GetCharField_t JNI_FastGetField::jni_fast_GetCharField_fp;
42 GetShortField_t JNI_FastGetField::jni_fast_GetShortField_fp;
43 GetIntField_t JNI_FastGetField::jni_fast_GetIntField_fp;
44 GetLongField_t JNI_FastGetField::jni_fast_GetLongField_fp;
45 GetFloatField_t JNI_FastGetField::jni_fast_GetFloatField_fp;
46 GetDoubleField_t JNI_FastGetField::jni_fast_GetDoubleField_fp;
47 #endif
48
49 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
50 // between loads, which is much more efficient than lfence.
51
generate_fast_get_int_field0(BasicType type)52 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
53 const char *name = NULL;
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 default: ShouldNotReachHere();
61 }
62 ResourceMark rm;
63 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
64 CodeBuffer cbuf(blob);
65 MacroAssembler* masm = new MacroAssembler(&cbuf);
66 address fast_entry = __ pc();
67
68 Label slow;
69
70 // stack layout: offset from rsp (in words):
71 // return pc 0
72 // jni env 1
73 // obj 2
74 // jfieldID 3
75
76 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
77 __ mov32 (rcx, counter);
78 __ testb (rcx, 1);
79 __ jcc (Assembler::notZero, slow);
80
81 if (JvmtiExport::can_post_field_access()) {
82 // Check to see if a field access watch has been set before we
83 // take the fast path.
84 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
85 __ jcc(Assembler::notZero, slow);
86 }
87
88 __ mov(rax, rcx);
89 __ andptr(rax, 1); // rax, must end up 0
90 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
91 // obj, notice rax, is 0.
92 // rdx is data dependent on rcx.
93 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
94
95 __ clear_jweak_tag(rdx);
96
97 __ movptr(rdx, Address(rdx, 0)); // *obj
98 __ shrptr (rax, 2); // offset
99
100 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
101 speculative_load_pclist[count] = __ pc();
102 switch (type) {
103 case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
104 case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
105 case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
106 case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
107 case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
108 default: ShouldNotReachHere();
109 }
110
111 Address ca1;
112 __ lea(rdx, counter);
113 __ xorptr(rdx, rax);
114 __ xorptr(rdx, rax);
115 __ cmp32(rcx, Address(rdx, 0));
116 // ca1 is the same as ca because
117 // rax, ^ counter_addr ^ rax, = address
118 // ca1 is data dependent on rax,.
119 __ jcc (Assembler::notEqual, slow);
120
121 #ifndef _WINDOWS
122 __ ret (0);
123 #else
124 // __stdcall calling convention
125 __ ret (3*wordSize);
126 #endif
127
128 slowcase_entry_pclist[count++] = __ pc();
129 __ bind (slow);
130 address slow_case_addr = NULL;
131 switch (type) {
132 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
133 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
134 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
135 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
136 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
137 default: ShouldNotReachHere();
138 }
139 // tail call
140 __ jump (ExternalAddress(slow_case_addr));
141
142 __ flush ();
143
144 #ifndef _WINDOWS
145 return fast_entry;
146 #else
147 switch (type) {
148 case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
149 case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t) fast_entry; break;
150 case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t) fast_entry; break;
151 case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t) fast_entry; break;
152 case T_INT: jni_fast_GetIntField_fp = (GetIntField_t) fast_entry; break;
153 }
154 return os::win32::fast_jni_accessor_wrapper(type);
155 #endif
156 }
157
generate_fast_get_boolean_field()158 address JNI_FastGetField::generate_fast_get_boolean_field() {
159 return generate_fast_get_int_field0(T_BOOLEAN);
160 }
161
generate_fast_get_byte_field()162 address JNI_FastGetField::generate_fast_get_byte_field() {
163 return generate_fast_get_int_field0(T_BYTE);
164 }
165
generate_fast_get_char_field()166 address JNI_FastGetField::generate_fast_get_char_field() {
167 return generate_fast_get_int_field0(T_CHAR);
168 }
169
generate_fast_get_short_field()170 address JNI_FastGetField::generate_fast_get_short_field() {
171 return generate_fast_get_int_field0(T_SHORT);
172 }
173
generate_fast_get_int_field()174 address JNI_FastGetField::generate_fast_get_int_field() {
175 return generate_fast_get_int_field0(T_INT);
176 }
177
generate_fast_get_long_field()178 address JNI_FastGetField::generate_fast_get_long_field() {
179 const char *name = "jni_fast_GetLongField";
180 ResourceMark rm;
181 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
182 CodeBuffer cbuf(blob);
183 MacroAssembler* masm = new MacroAssembler(&cbuf);
184 address fast_entry = __ pc();
185
186 Label slow;
187
188 // stack layout: offset from rsp (in words):
189 // old rsi 0
190 // return pc 1
191 // jni env 2
192 // obj 3
193 // jfieldID 4
194
195 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
196
197 __ push (rsi);
198 __ mov32 (rcx, counter);
199 __ testb (rcx, 1);
200 __ jcc (Assembler::notZero, slow);
201
202 if (JvmtiExport::can_post_field_access()) {
203 // Check to see if a field access watch has been set before we
204 // take the fast path.
205 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
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
generate_fast_get_float_field0(BasicType type)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 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0);
298 __ jcc(Assembler::notZero, slow);
299 }
300
301 __ mov(rax, rcx);
302 __ andptr(rax, 1); // rax, must end up 0
303 __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
304 // obj, notice rax, is 0.
305 // rdx is data dependent on rcx.
306 __ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
307
308 __ clear_jweak_tag(rdx);
309
310 __ movptr(rdx, Address(rdx, 0)); // *obj
311 __ shrptr(rax, 2); // offset
312
313 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
314 speculative_load_pclist[count] = __ pc();
315 switch (type) {
316 #ifndef _LP64
317 case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
318 case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
319 #else
320 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
321 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
322 #endif // _LP64
323 default: ShouldNotReachHere();
324 }
325
326 Address ca1;
327 __ fst_s (Address(rsp, -4));
328 __ lea(rdx, counter);
329 __ movl (rax, Address(rsp, -4));
330 // garbage hi-order bits on 64bit are harmless.
331 __ xorptr(rdx, rax);
332 __ xorptr(rdx, rax);
333 __ cmp32(rcx, Address(rdx, 0));
334 // rax, ^ counter_addr ^ rax, = address
335 // ca1 is data dependent on the field
336 // access.
337 __ jcc (Assembler::notEqual, slow_with_pop);
338
339 #ifndef _WINDOWS
340 __ ret (0);
341 #else
342 // __stdcall calling convention
343 __ ret (3*wordSize);
344 #endif
345
346 __ bind (slow_with_pop);
347 // invalid load. pop FPU stack.
348 __ fstp_d (0);
349
350 slowcase_entry_pclist[count++] = __ pc();
351 __ bind (slow);
352 address slow_case_addr = NULL;
353 switch (type) {
354 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
355 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
356 default: ShouldNotReachHere();
357 }
358 // tail call
359 __ jump (ExternalAddress(slow_case_addr));
360
361 __ flush ();
362
363 #ifndef _WINDOWS
364 return fast_entry;
365 #else
366 switch (type) {
367 case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t) fast_entry; break;
368 case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
369 }
370 return os::win32::fast_jni_accessor_wrapper(type);
371 #endif
372 }
373
generate_fast_get_float_field()374 address JNI_FastGetField::generate_fast_get_float_field() {
375 return generate_fast_get_float_field0(T_FLOAT);
376 }
377
generate_fast_get_double_field()378 address JNI_FastGetField::generate_fast_get_double_field() {
379 return generate_fast_get_float_field0(T_DOUBLE);
380 }
381