1/*
2 * Copyright (c) 2004, 2017, 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
37GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
38GetByteField_t    JNI_FastGetField::jni_fast_GetByteField_fp;
39GetCharField_t    JNI_FastGetField::jni_fast_GetCharField_fp;
40GetShortField_t   JNI_FastGetField::jni_fast_GetShortField_fp;
41GetIntField_t     JNI_FastGetField::jni_fast_GetIntField_fp;
42GetLongField_t    JNI_FastGetField::jni_fast_GetLongField_fp;
43GetFloatField_t   JNI_FastGetField::jni_fast_GetFloatField_fp;
44GetDoubleField_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
50address 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  if (os::is_MP()) {
79    __ mov(rax, rcx);
80    __ andptr(rax, 1);                         // rax, must end up 0
81    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
82                                              // obj, notice rax, is 0.
83                                              // rdx is data dependent on rcx.
84  } else {
85    __ movptr (rdx, Address(rsp, 2*wordSize));  // obj
86  }
87  __ movptr(rax, Address(rsp, 3*wordSize));  // jfieldID
88
89  __ clear_jweak_tag(rdx);
90
91  __ movptr(rdx, Address(rdx, 0));           // *obj
92  __ shrptr (rax, 2);                         // offset
93
94  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
95  speculative_load_pclist[count] = __ pc();
96  switch (type) {
97    case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
98    case T_BYTE:    __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
99    case T_CHAR:    __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
100    case T_SHORT:   __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
101    case T_INT:     __ movl   (rax, Address(rdx, rax, Address::times_1)); break;
102    default:        ShouldNotReachHere();
103  }
104
105  Address ca1;
106  if (os::is_MP()) {
107    __ lea(rdx, counter);
108    __ xorptr(rdx, rax);
109    __ xorptr(rdx, rax);
110    __ cmp32(rcx, Address(rdx, 0));
111    // ca1 is the same as ca because
112    // rax, ^ counter_addr ^ rax, = address
113    // ca1 is data dependent on rax,.
114  } else {
115    __ cmp32(rcx, counter);
116  }
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();
135  }
136  // tail call
137  __ jump (ExternalAddress(slow_case_addr));
138
139  __ flush ();
140
141#ifndef _WINDOWS
142  return fast_entry;
143#else
144  switch (type) {
145  case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
146  case T_BYTE:    jni_fast_GetByteField_fp    = (GetByteField_t)    fast_entry; break;
147  case T_CHAR:    jni_fast_GetCharField_fp    = (GetCharField_t)    fast_entry; break;
148  case T_SHORT:   jni_fast_GetShortField_fp   = (GetShortField_t)   fast_entry; break;
149  case T_INT:     jni_fast_GetIntField_fp     = (GetIntField_t)     fast_entry; break;
150  }
151  return os::win32::fast_jni_accessor_wrapper(type);
152#endif
153}
154
155address JNI_FastGetField::generate_fast_get_boolean_field() {
156  return generate_fast_get_int_field0(T_BOOLEAN);
157}
158
159address JNI_FastGetField::generate_fast_get_byte_field() {
160  return generate_fast_get_int_field0(T_BYTE);
161}
162
163address JNI_FastGetField::generate_fast_get_char_field() {
164  return generate_fast_get_int_field0(T_CHAR);
165}
166
167address JNI_FastGetField::generate_fast_get_short_field() {
168  return generate_fast_get_int_field0(T_SHORT);
169}
170
171address JNI_FastGetField::generate_fast_get_int_field() {
172  return generate_fast_get_int_field0(T_INT);
173}
174
175address JNI_FastGetField::generate_fast_get_long_field() {
176  const char *name = "jni_fast_GetLongField";
177  ResourceMark rm;
178  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
179  CodeBuffer cbuf(blob);
180  MacroAssembler* masm = new MacroAssembler(&cbuf);
181  address fast_entry = __ pc();
182
183  Label slow;
184
185  // stack layout:    offset from rsp (in words):
186  //  old rsi          0
187  //  return pc        1
188  //  jni env          2
189  //  obj              3
190  //  jfieldID         4
191
192  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
193
194  __ push  (rsi);
195  __ mov32 (rcx, counter);
196  __ testb (rcx, 1);
197  __ jcc (Assembler::notZero, slow);
198  if (os::is_MP()) {
199    __ mov(rax, rcx);
200    __ andptr(rax, 1);                         // rax, must end up 0
201    __ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
202                                              // obj, notice rax, is 0.
203                                              // rdx is data dependent on rcx.
204  } else {
205    __ movptr(rdx, Address(rsp, 3*wordSize));  // obj
206  }
207  __ movptr(rsi, Address(rsp, 4*wordSize));  // jfieldID
208
209  __ clear_jweak_tag(rdx);
210
211  __ movptr(rdx, Address(rdx, 0));           // *obj
212  __ shrptr(rsi, 2);                         // offset
213
214  assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
215  speculative_load_pclist[count++] = __ pc();
216  __ movptr(rax, Address(rdx, rsi, Address::times_1));
217#ifndef _LP64
218  speculative_load_pclist[count] = __ pc();
219  __ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
220#endif // _LP64
221
222  if (os::is_MP()) {
223    __ lea(rsi, counter);
224    __ xorptr(rsi, rdx);
225    __ xorptr(rsi, rax);
226    __ xorptr(rsi, rdx);
227    __ xorptr(rsi, rax);
228    __ cmp32(rcx, Address(rsi, 0));
229    // ca1 is the same as ca because
230    // rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
231    // ca1 is data dependent on both rax, and rdx.
232  } else {
233    __ cmp32(rcx, counter);
234  }
235  __ jcc (Assembler::notEqual, slow);
236
237  __ pop (rsi);
238
239#ifndef _WINDOWS
240  __ ret (0);
241#else
242  // __stdcall calling convention
243  __ ret (3*wordSize);
244#endif
245
246  slowcase_entry_pclist[count-1] = __ pc();
247  slowcase_entry_pclist[count++] = __ pc();
248  __ bind (slow);
249  __ pop  (rsi);
250  address slow_case_addr = jni_GetLongField_addr();;
251  // tail call
252  __ jump (ExternalAddress(slow_case_addr));
253
254  __ flush ();
255
256#ifndef _WINDOWS
257  return fast_entry;
258#else
259  jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;
260  return os::win32::fast_jni_accessor_wrapper(T_LONG);
261#endif
262}
263
264address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
265  const char *name = NULL;
266  switch (type) {
267    case T_FLOAT:  name = "jni_fast_GetFloatField";  break;
268    case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
269    default:       ShouldNotReachHere();
270  }
271  ResourceMark rm;
272  BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
273  CodeBuffer cbuf(blob);
274  MacroAssembler* masm = new MacroAssembler(&cbuf);
275  address fast_entry = __ pc();
276
277  Label slow_with_pop, slow;
278
279  // stack layout:    offset from rsp (in words):
280  //  return pc        0
281  //  jni env          1
282  //  obj              2
283  //  jfieldID         3
284
285  ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
286
287  __ mov32 (rcx, counter);
288  __ testb (rcx, 1);
289  __ jcc (Assembler::notZero, slow);
290  if (os::is_MP()) {
291    __ mov(rax, rcx);
292    __ andptr(rax, 1);                         // rax, must end up 0
293    __ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
294                                              // obj, notice rax, is 0.
295                                              // rdx is data dependent on rcx.
296  } else {
297    __ movptr(rdx, Address(rsp, 2*wordSize)); // obj
298  }
299  __ movptr(rax, Address(rsp, 3*wordSize));  // jfieldID
300
301  __ clear_jweak_tag(rdx);
302
303  __ movptr(rdx, Address(rdx, 0));           // *obj
304  __ shrptr(rax, 2);                         // offset
305
306  assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
307  speculative_load_pclist[count] = __ pc();
308  switch (type) {
309#ifndef _LP64
310    case T_FLOAT:  __ fld_s (Address(rdx, rax, Address::times_1)); break;
311    case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
312#else
313    case T_FLOAT:  __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
314    case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
315#endif // _LP64
316    default:       ShouldNotReachHere();
317  }
318
319  Address ca1;
320  if (os::is_MP()) {
321    __ fst_s (Address(rsp, -4));
322    __ lea(rdx, counter);
323    __ movl (rax, Address(rsp, -4));
324    // garbage hi-order bits on 64bit are harmless.
325    __ xorptr(rdx, rax);
326    __ xorptr(rdx, rax);
327    __ cmp32(rcx, Address(rdx, 0));
328                                          // rax, ^ counter_addr ^ rax, = address
329                                          // ca1 is data dependent on the field
330                                          // access.
331  } else {
332    __ cmp32(rcx, counter);
333  }
334  __ jcc (Assembler::notEqual, slow_with_pop);
335
336#ifndef _WINDOWS
337  __ ret (0);
338#else
339  // __stdcall calling convention
340  __ ret (3*wordSize);
341#endif
342
343  __ bind (slow_with_pop);
344  // invalid load. pop FPU stack.
345  __ fstp_d (0);
346
347  slowcase_entry_pclist[count++] = __ pc();
348  __ bind (slow);
349  address slow_case_addr = NULL;
350  switch (type) {
351    case T_FLOAT:  slow_case_addr = jni_GetFloatField_addr();  break;
352    case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
353    default:       ShouldNotReachHere();
354  }
355  // tail call
356  __ jump (ExternalAddress(slow_case_addr));
357
358  __ flush ();
359
360#ifndef _WINDOWS
361  return fast_entry;
362#else
363  switch (type) {
364  case T_FLOAT:  jni_fast_GetFloatField_fp  = (GetFloatField_t)  fast_entry; break;
365  case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
366  }
367  return os::win32::fast_jni_accessor_wrapper(type);
368#endif
369}
370
371address JNI_FastGetField::generate_fast_get_float_field() {
372  return generate_fast_get_float_field0(T_FLOAT);
373}
374
375address JNI_FastGetField::generate_fast_get_double_field() {
376  return generate_fast_get_float_field0(T_DOUBLE);
377}
378