1 /*
  2  * Copyright (c) 2020, 2025, 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 "classfile/vmIntrinsics.hpp"
 26 #include "classfile/vmSymbols.hpp"
 27 #include "compiler/compilerDirectives.hpp"
 28 #include "jvm_constants.h"
 29 #include "jvm_io.h"
 30 #ifdef COMPILER2
 31 #include "opto/c2_globals.hpp"
 32 #endif
 33 #include "runtime/vm_version.hpp"
 34 #include "utilities/checkedCast.hpp"
 35 #include "utilities/tribool.hpp"
 36 
 37 // These are flag-matching functions:
 38 inline bool match_F_R(u2 flags) {
 39   const int req = 0;
 40   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED | JVM_ACC_NATIVE;
 41   return (flags & (req | neg)) == req;
 42 }
 43 
 44 inline bool match_F_Y(u2 flags) {
 45   const int req = JVM_ACC_SYNCHRONIZED;
 46   const int neg = JVM_ACC_STATIC | JVM_ACC_NATIVE;
 47   return (flags & (req | neg)) == req;
 48 }
 49 
 50 inline bool match_F_RN(u2 flags) {
 51   const int req = JVM_ACC_NATIVE;
 52   const int neg = JVM_ACC_STATIC | JVM_ACC_SYNCHRONIZED;
 53   return (flags & (req | neg)) == req;
 54 }
 55 
 56 inline bool match_F_S(u2 flags) {
 57   const int req = JVM_ACC_STATIC;
 58   const int neg = JVM_ACC_SYNCHRONIZED | JVM_ACC_NATIVE;
 59   return (flags & (req | neg)) == req;
 60 }
 61 
 62 inline bool match_F_SN(u2 flags) {
 63   const int req = JVM_ACC_STATIC | JVM_ACC_NATIVE;
 64   const int neg = JVM_ACC_SYNCHRONIZED;
 65   return (flags & (req | neg)) == req;
 66 }
 67 
 68 bool vmIntrinsics::preserves_state(vmIntrinsics::ID id) {
 69   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
 70   switch(id) {
 71 #ifdef JFR_HAVE_INTRINSICS
 72   case vmIntrinsics::_counterTime:
 73 #endif
 74   case vmIntrinsics::_currentTimeMillis:
 75   case vmIntrinsics::_nanoTime:
 76   case vmIntrinsics::_floatToRawIntBits:
 77   case vmIntrinsics::_intBitsToFloat:
 78   case vmIntrinsics::_doubleToRawLongBits:
 79   case vmIntrinsics::_longBitsToDouble:
 80   case vmIntrinsics::_getClass:
 81   case vmIntrinsics::_isInstance:
 82   case vmIntrinsics::_currentCarrierThread:
 83   case vmIntrinsics::_currentThread:
 84   case vmIntrinsics::_scopedValueCache:
 85   case vmIntrinsics::_dabs:
 86   case vmIntrinsics::_fabs:
 87   case vmIntrinsics::_iabs:
 88   case vmIntrinsics::_labs:
 89   case vmIntrinsics::_dsqrt:
 90   case vmIntrinsics::_dsqrt_strict:
 91   case vmIntrinsics::_dsin:
 92   case vmIntrinsics::_dcos:
 93   case vmIntrinsics::_dtan:
 94   case vmIntrinsics::_dtanh:
 95   case vmIntrinsics::_dlog:
 96   case vmIntrinsics::_dlog10:
 97   case vmIntrinsics::_dexp:
 98   case vmIntrinsics::_dpow:
 99   case vmIntrinsics::_Preconditions_checkIndex:
100   case vmIntrinsics::_Preconditions_checkLongIndex:
101   case vmIntrinsics::_Reference_get:
102   case vmIntrinsics::_Continuation_doYield:
103   case vmIntrinsics::_updateCRC32:
104   case vmIntrinsics::_updateBytesCRC32:
105   case vmIntrinsics::_updateByteBufferCRC32:
106   case vmIntrinsics::_updateBytesAdler32:
107   case vmIntrinsics::_vectorizedMismatch:
108   case vmIntrinsics::_fmaD:
109   case vmIntrinsics::_fmaF:
110   case vmIntrinsics::_isDigit:
111   case vmIntrinsics::_isLowerCase:
112   case vmIntrinsics::_isUpperCase:
113   case vmIntrinsics::_isWhitespace:
114     return true;
115   default:
116     return false;
117   }
118 }
119 
120 bool vmIntrinsics::can_trap(vmIntrinsics::ID id) {
121   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
122   switch(id) {
123 #ifdef JFR_HAVE_INTRINSICS
124   case vmIntrinsics::_counterTime:
125 #endif
126   case vmIntrinsics::_currentTimeMillis:
127   case vmIntrinsics::_nanoTime:
128   case vmIntrinsics::_floatToRawIntBits:
129   case vmIntrinsics::_intBitsToFloat:
130   case vmIntrinsics::_doubleToRawLongBits:
131   case vmIntrinsics::_longBitsToDouble:
132   case vmIntrinsics::_currentCarrierThread:
133   case vmIntrinsics::_currentThread:
134   case vmIntrinsics::_setCurrentThread:
135   case vmIntrinsics::_scopedValueCache:
136   case vmIntrinsics::_setScopedValueCache:
137   case vmIntrinsics::_dabs:
138   case vmIntrinsics::_fabs:
139   case vmIntrinsics::_iabs:
140   case vmIntrinsics::_labs:
141   case vmIntrinsics::_dsqrt:
142   case vmIntrinsics::_dsqrt_strict:
143   case vmIntrinsics::_dsin:
144   case vmIntrinsics::_dcos:
145   case vmIntrinsics::_dtan:
146   case vmIntrinsics::_dtanh:
147   case vmIntrinsics::_dlog:
148   case vmIntrinsics::_dlog10:
149   case vmIntrinsics::_dexp:
150   case vmIntrinsics::_dpow:
151   case vmIntrinsics::_updateCRC32:
152   case vmIntrinsics::_updateBytesCRC32:
153   case vmIntrinsics::_updateByteBufferCRC32:
154   case vmIntrinsics::_vectorizedMismatch:
155   case vmIntrinsics::_fmaD:
156   case vmIntrinsics::_fmaF:
157     return false;
158   default:
159     return true;
160   }
161 }
162 
163 // Some intrinsics produce different results if they are not pinned
164 bool vmIntrinsics::should_be_pinned(vmIntrinsics::ID id) {
165   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
166   switch(id) {
167 #ifdef JFR_HAVE_INTRINSICS
168   case vmIntrinsics::_counterTime:
169 #endif
170   case vmIntrinsics::_currentTimeMillis:
171   case vmIntrinsics::_nanoTime:
172   case vmIntrinsics::_blackhole:
173     return true;
174   default:
175     return false;
176   }
177 }
178 
179 bool vmIntrinsics::does_virtual_dispatch(vmIntrinsics::ID id) {
180   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
181   switch(id) {
182   case vmIntrinsics::_hashCode:
183   case vmIntrinsics::_clone:
184     return true;
185     break;
186   default:
187     return false;
188   }
189 }
190 
191 int vmIntrinsics::predicates_needed(vmIntrinsics::ID id) {
192   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
193   switch (id) {
194   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
195   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
196   case vmIntrinsics::_electronicCodeBook_encryptAESCrypt:
197   case vmIntrinsics::_electronicCodeBook_decryptAESCrypt:
198   case vmIntrinsics::_counterMode_AESCrypt:
199   case vmIntrinsics::_galoisCounterMode_AESCrypt:
200     return 1;
201   case vmIntrinsics::_digestBase_implCompressMB:
202     return 5;
203   default:
204     return 0;
205   }
206 }
207 
208 bool vmIntrinsics::disabled_by_jvm_flags(vmIntrinsics::ID id) {
209   assert(id != vmIntrinsics::_none, "must be a VM intrinsic");
210 
211   // -XX:-InlineNatives disables nearly all intrinsics except the ones listed in
212   // the following switch statement.
213   if (!InlineNatives) {
214     switch (id) {
215     case vmIntrinsics::_indexOfL:
216     case vmIntrinsics::_indexOfU:
217     case vmIntrinsics::_indexOfUL:
218     case vmIntrinsics::_indexOfIL:
219     case vmIntrinsics::_indexOfIU:
220     case vmIntrinsics::_indexOfIUL:
221     case vmIntrinsics::_indexOfU_char:
222     case vmIntrinsics::_indexOfL_char:
223     case vmIntrinsics::_compareToL:
224     case vmIntrinsics::_compareToU:
225     case vmIntrinsics::_compareToLU:
226     case vmIntrinsics::_compareToUL:
227     case vmIntrinsics::_equalsL:
228     case vmIntrinsics::_equalsC:
229     case vmIntrinsics::_vectorizedHashCode:
230     case vmIntrinsics::_getCharStringU:
231     case vmIntrinsics::_putCharStringU:
232     case vmIntrinsics::_compressStringC:
233     case vmIntrinsics::_compressStringB:
234     case vmIntrinsics::_inflateStringC:
235     case vmIntrinsics::_inflateStringB:
236     case vmIntrinsics::_getAndAddInt:
237     case vmIntrinsics::_getAndAddLong:
238     case vmIntrinsics::_getAndSetInt:
239     case vmIntrinsics::_getAndSetLong:
240     case vmIntrinsics::_getAndSetReference:
241     case vmIntrinsics::_loadFence:
242     case vmIntrinsics::_storeFence:
243     case vmIntrinsics::_fullFence:
244     case vmIntrinsics::_countPositives:
245     case vmIntrinsics::_Reference_get:
246     case vmIntrinsics::_Continuation_doYield:
247     case vmIntrinsics::_Continuation_enterSpecial:
248     case vmIntrinsics::_Continuation_pin:
249     case vmIntrinsics::_Continuation_unpin:
250       break;
251     default:
252       return true;
253     }
254   }
255 
256   switch (id) {
257   case vmIntrinsics::_isInstance:
258   case vmIntrinsics::_isAssignableFrom:
259   case vmIntrinsics::_isHidden:
260   case vmIntrinsics::_getSuperclass:
261   case vmIntrinsics::_Class_cast:
262   case vmIntrinsics::_getLength:
263   case vmIntrinsics::_newArray:
264   case vmIntrinsics::_newNullRestrictedArray:
265   case vmIntrinsics::_newNullRestrictedAtomicArray:
266   case vmIntrinsics::_newNullableAtomicArray:
267   case vmIntrinsics::_getClass:
268     if (!InlineClassNatives) return true;
269     break;
270   case vmIntrinsics::_currentCarrierThread:
271   case vmIntrinsics::_currentThread:
272     if (!InlineThreadNatives) return true;
273     break;
274   case vmIntrinsics::_setCurrentThread:
275   case vmIntrinsics::_scopedValueCache:
276   case vmIntrinsics::_setScopedValueCache:
277   case vmIntrinsics::_floatToRawIntBits:
278   case vmIntrinsics::_intBitsToFloat:
279   case vmIntrinsics::_doubleToRawLongBits:
280   case vmIntrinsics::_longBitsToDouble:
281   case vmIntrinsics::_ceil:
282   case vmIntrinsics::_floor:
283   case vmIntrinsics::_rint:
284   case vmIntrinsics::_dabs:
285   case vmIntrinsics::_fabs:
286   case vmIntrinsics::_iabs:
287   case vmIntrinsics::_labs:
288   case vmIntrinsics::_dsqrt:
289   case vmIntrinsics::_dsqrt_strict:
290   case vmIntrinsics::_dsin:
291   case vmIntrinsics::_dcos:
292   case vmIntrinsics::_dtan:
293   case vmIntrinsics::_dtanh:
294   case vmIntrinsics::_dlog:
295   case vmIntrinsics::_dexp:
296   case vmIntrinsics::_dpow:
297   case vmIntrinsics::_dlog10:
298   case vmIntrinsics::_datan2:
299   case vmIntrinsics::_floatToIntBits:
300   case vmIntrinsics::_doubleToLongBits:
301   case vmIntrinsics::_min:
302   case vmIntrinsics::_max:
303   case vmIntrinsics::_maxF:
304   case vmIntrinsics::_minF:
305   case vmIntrinsics::_maxD:
306   case vmIntrinsics::_minD:
307   case vmIntrinsics::_min_strict:
308   case vmIntrinsics::_max_strict:
309   case vmIntrinsics::_maxF_strict:
310   case vmIntrinsics::_minF_strict:
311   case vmIntrinsics::_maxD_strict:
312   case vmIntrinsics::_minD_strict:
313     if (!InlineMathNatives) return true;
314     break;
315   case vmIntrinsics::_fmaD:
316   case vmIntrinsics::_fmaF:
317     if (!InlineMathNatives || !UseFMA) return true;
318     break;
319   case vmIntrinsics::_floatToFloat16:
320   case vmIntrinsics::_float16ToFloat:
321     if (!InlineIntrinsics) return true;
322     break;
323   case vmIntrinsics::_arraycopy:
324     if (!InlineArrayCopy) return true;
325     break;
326   case vmIntrinsics::_updateCRC32:
327   case vmIntrinsics::_updateBytesCRC32:
328   case vmIntrinsics::_updateByteBufferCRC32:
329     if (!UseCRC32Intrinsics) return true;
330     break;
331   case vmIntrinsics::_makePrivateBuffer:
332   case vmIntrinsics::_finishPrivateBuffer:
333   case vmIntrinsics::_getReference:
334   case vmIntrinsics::_getBoolean:
335   case vmIntrinsics::_getByte:
336   case vmIntrinsics::_getShort:
337   case vmIntrinsics::_getChar:
338   case vmIntrinsics::_getInt:
339   case vmIntrinsics::_getLong:
340   case vmIntrinsics::_getFloat:
341   case vmIntrinsics::_getDouble:
342   case vmIntrinsics::_getValue:
343   case vmIntrinsics::_putReference:
344   case vmIntrinsics::_putBoolean:
345   case vmIntrinsics::_putByte:
346   case vmIntrinsics::_putShort:
347   case vmIntrinsics::_putChar:
348   case vmIntrinsics::_putInt:
349   case vmIntrinsics::_putLong:
350   case vmIntrinsics::_putFloat:
351   case vmIntrinsics::_putDouble:
352   case vmIntrinsics::_putValue:
353   case vmIntrinsics::_getReferenceVolatile:
354   case vmIntrinsics::_getBooleanVolatile:
355   case vmIntrinsics::_getByteVolatile:
356   case vmIntrinsics::_getShortVolatile:
357   case vmIntrinsics::_getCharVolatile:
358   case vmIntrinsics::_getIntVolatile:
359   case vmIntrinsics::_getLongVolatile:
360   case vmIntrinsics::_getFloatVolatile:
361   case vmIntrinsics::_getDoubleVolatile:
362   case vmIntrinsics::_putReferenceVolatile:
363   case vmIntrinsics::_putBooleanVolatile:
364   case vmIntrinsics::_putByteVolatile:
365   case vmIntrinsics::_putShortVolatile:
366   case vmIntrinsics::_putCharVolatile:
367   case vmIntrinsics::_putIntVolatile:
368   case vmIntrinsics::_putLongVolatile:
369   case vmIntrinsics::_putFloatVolatile:
370   case vmIntrinsics::_putDoubleVolatile:
371   case vmIntrinsics::_getReferenceAcquire:
372   case vmIntrinsics::_getBooleanAcquire:
373   case vmIntrinsics::_getByteAcquire:
374   case vmIntrinsics::_getShortAcquire:
375   case vmIntrinsics::_getCharAcquire:
376   case vmIntrinsics::_getIntAcquire:
377   case vmIntrinsics::_getLongAcquire:
378   case vmIntrinsics::_getFloatAcquire:
379   case vmIntrinsics::_getDoubleAcquire:
380   case vmIntrinsics::_putReferenceRelease:
381   case vmIntrinsics::_putBooleanRelease:
382   case vmIntrinsics::_putByteRelease:
383   case vmIntrinsics::_putShortRelease:
384   case vmIntrinsics::_putCharRelease:
385   case vmIntrinsics::_putIntRelease:
386   case vmIntrinsics::_putLongRelease:
387   case vmIntrinsics::_putFloatRelease:
388   case vmIntrinsics::_putDoubleRelease:
389   case vmIntrinsics::_getReferenceOpaque:
390   case vmIntrinsics::_getBooleanOpaque:
391   case vmIntrinsics::_getByteOpaque:
392   case vmIntrinsics::_getShortOpaque:
393   case vmIntrinsics::_getCharOpaque:
394   case vmIntrinsics::_getIntOpaque:
395   case vmIntrinsics::_getLongOpaque:
396   case vmIntrinsics::_getFloatOpaque:
397   case vmIntrinsics::_getDoubleOpaque:
398   case vmIntrinsics::_putReferenceOpaque:
399   case vmIntrinsics::_putBooleanOpaque:
400   case vmIntrinsics::_putByteOpaque:
401   case vmIntrinsics::_putShortOpaque:
402   case vmIntrinsics::_putCharOpaque:
403   case vmIntrinsics::_putIntOpaque:
404   case vmIntrinsics::_putLongOpaque:
405   case vmIntrinsics::_putFloatOpaque:
406   case vmIntrinsics::_putDoubleOpaque:
407   case vmIntrinsics::_getAndAddInt:
408   case vmIntrinsics::_getAndAddLong:
409   case vmIntrinsics::_getAndSetInt:
410   case vmIntrinsics::_getAndSetLong:
411   case vmIntrinsics::_getAndSetReference:
412   case vmIntrinsics::_loadFence:
413   case vmIntrinsics::_storeFence:
414   case vmIntrinsics::_fullFence:
415   case vmIntrinsics::_compareAndSetLong:
416   case vmIntrinsics::_weakCompareAndSetLong:
417   case vmIntrinsics::_weakCompareAndSetLongPlain:
418   case vmIntrinsics::_weakCompareAndSetLongAcquire:
419   case vmIntrinsics::_weakCompareAndSetLongRelease:
420   case vmIntrinsics::_compareAndSetInt:
421   case vmIntrinsics::_weakCompareAndSetInt:
422   case vmIntrinsics::_weakCompareAndSetIntPlain:
423   case vmIntrinsics::_weakCompareAndSetIntAcquire:
424   case vmIntrinsics::_weakCompareAndSetIntRelease:
425   case vmIntrinsics::_compareAndSetReference:
426   case vmIntrinsics::_weakCompareAndSetReference:
427   case vmIntrinsics::_weakCompareAndSetReferencePlain:
428   case vmIntrinsics::_weakCompareAndSetReferenceAcquire:
429   case vmIntrinsics::_weakCompareAndSetReferenceRelease:
430   case vmIntrinsics::_compareAndExchangeInt:
431   case vmIntrinsics::_compareAndExchangeIntAcquire:
432   case vmIntrinsics::_compareAndExchangeIntRelease:
433   case vmIntrinsics::_compareAndExchangeLong:
434   case vmIntrinsics::_compareAndExchangeLongAcquire:
435   case vmIntrinsics::_compareAndExchangeLongRelease:
436   case vmIntrinsics::_compareAndExchangeReference:
437   case vmIntrinsics::_compareAndExchangeReferenceAcquire:
438   case vmIntrinsics::_compareAndExchangeReferenceRelease:
439   case vmIntrinsics::_allocateInstance:
440     if (!InlineUnsafeOps) return true;
441     break;
442   case vmIntrinsics::_getShortUnaligned:
443   case vmIntrinsics::_getCharUnaligned:
444   case vmIntrinsics::_getIntUnaligned:
445   case vmIntrinsics::_getLongUnaligned:
446   case vmIntrinsics::_putShortUnaligned:
447   case vmIntrinsics::_putCharUnaligned:
448   case vmIntrinsics::_putIntUnaligned:
449   case vmIntrinsics::_putLongUnaligned:
450     if (!InlineUnsafeOps || !UseUnalignedAccesses) return true;
451     break;
452   case vmIntrinsics::_hashCode:
453     if (!InlineObjectHash) return true;
454     break;
455   case vmIntrinsics::_aescrypt_encryptBlock:
456   case vmIntrinsics::_aescrypt_decryptBlock:
457     if (!UseAESIntrinsics) return true;
458     break;
459   case vmIntrinsics::_cipherBlockChaining_encryptAESCrypt:
460   case vmIntrinsics::_cipherBlockChaining_decryptAESCrypt:
461     if (!UseAESIntrinsics) return true;
462     break;
463   case vmIntrinsics::_electronicCodeBook_encryptAESCrypt:
464   case vmIntrinsics::_electronicCodeBook_decryptAESCrypt:
465     if (!UseAESIntrinsics) return true;
466     break;
467   case vmIntrinsics::_counterMode_AESCrypt:
468     if (!UseAESCTRIntrinsics) return true;
469     break;
470   case vmIntrinsics::_galoisCounterMode_AESCrypt:
471     if (!UseAESIntrinsics) return true;
472     break;
473   case vmIntrinsics::_md5_implCompress:
474     if (!UseMD5Intrinsics) return true;
475     break;
476   case vmIntrinsics::_sha_implCompress:
477     if (!UseSHA1Intrinsics) return true;
478     break;
479   case vmIntrinsics::_sha2_implCompress:
480     if (!UseSHA256Intrinsics) return true;
481     break;
482   case vmIntrinsics::_sha5_implCompress:
483     if (!UseSHA512Intrinsics) return true;
484     break;
485   case vmIntrinsics::_double_keccak:
486   case vmIntrinsics::_sha3_implCompress:
487     if (!UseSHA3Intrinsics) return true;
488     break;
489   case vmIntrinsics::_digestBase_implCompressMB:
490     if (!(UseMD5Intrinsics || UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics || UseSHA3Intrinsics)) return true;
491     break;
492   case vmIntrinsics::_ghash_processBlocks:
493     if (!UseGHASHIntrinsics) return true;
494     break;
495   case vmIntrinsics::_chacha20Block:
496     if (!UseChaCha20Intrinsics) return true;
497     break;
498   case vmIntrinsics::_dilithiumAlmostNtt:
499   case vmIntrinsics::_dilithiumAlmostInverseNtt:
500   case vmIntrinsics::_dilithiumNttMult:
501   case vmIntrinsics::_dilithiumMontMulByConstant:
502   case vmIntrinsics::_dilithiumDecomposePoly:
503     if (!UseDilithiumIntrinsics) return true;
504     break;
505   case vmIntrinsics::_base64_encodeBlock:
506   case vmIntrinsics::_base64_decodeBlock:
507     if (!UseBASE64Intrinsics) return true;
508     break;
509   case vmIntrinsics::_poly1305_processBlocks:
510     if (!UsePoly1305Intrinsics) return true;
511     break;
512   case vmIntrinsics::_intpoly_montgomeryMult_P256:
513   case vmIntrinsics::_intpoly_assign:
514     if (!UseIntPolyIntrinsics) return true;
515     break;
516   case vmIntrinsics::_updateBytesCRC32C:
517   case vmIntrinsics::_updateDirectByteBufferCRC32C:
518     if (!UseCRC32CIntrinsics) return true;
519     break;
520   case vmIntrinsics::_vectorizedMismatch:
521     if (!UseVectorizedMismatchIntrinsic) return true;
522     break;
523   case vmIntrinsics::_updateBytesAdler32:
524   case vmIntrinsics::_updateByteBufferAdler32:
525     if (!UseAdler32Intrinsics) return true;
526     break;
527   case vmIntrinsics::_copyMemory:
528     if (!InlineArrayCopy || !InlineUnsafeOps) return true;
529     break;
530   case vmIntrinsics::_setMemory:
531     if (!InlineUnsafeOps) return true;
532     break;
533 #ifdef COMPILER2
534   case vmIntrinsics::_clone:
535   case vmIntrinsics::_copyOf:
536   case vmIntrinsics::_copyOfRange:
537     // These intrinsics use both the objectcopy and the arraycopy
538     // intrinsic mechanism.
539     if (!InlineObjectCopy || !InlineArrayCopy) return true;
540     break;
541   case vmIntrinsics::_compareToL:
542   case vmIntrinsics::_compareToU:
543   case vmIntrinsics::_compareToLU:
544   case vmIntrinsics::_compareToUL:
545     if (!SpecialStringCompareTo) return true;
546     break;
547   case vmIntrinsics::_indexOfL:
548   case vmIntrinsics::_indexOfU:
549   case vmIntrinsics::_indexOfUL:
550   case vmIntrinsics::_indexOfIL:
551   case vmIntrinsics::_indexOfIU:
552   case vmIntrinsics::_indexOfIUL:
553   case vmIntrinsics::_indexOfU_char:
554   case vmIntrinsics::_indexOfL_char:
555     if (!SpecialStringIndexOf) return true;
556     break;
557   case vmIntrinsics::_equalsL:
558     if (!SpecialStringEquals) return true;
559     break;
560   case vmIntrinsics::_vectorizedHashCode:
561     if (!UseVectorizedHashCodeIntrinsic) return true;
562     break;
563   case vmIntrinsics::_equalsB:
564   case vmIntrinsics::_equalsC:
565     if (!SpecialArraysEquals) return true;
566     break;
567   case vmIntrinsics::_encodeISOArray:
568   case vmIntrinsics::_encodeAsciiArray:
569   case vmIntrinsics::_encodeByteISOArray:
570     if (!SpecialEncodeISOArray) return true;
571     break;
572   case vmIntrinsics::_getCallerClass:
573     if (!InlineReflectionGetCallerClass) return true;
574     break;
575   case vmIntrinsics::_multiplyToLen:
576     if (!UseMultiplyToLenIntrinsic) return true;
577     break;
578   case vmIntrinsics::_squareToLen:
579     if (!UseSquareToLenIntrinsic) return true;
580     break;
581   case vmIntrinsics::_mulAdd:
582     if (!UseMulAddIntrinsic) return true;
583     break;
584   case vmIntrinsics::_montgomeryMultiply:
585     if (!UseMontgomeryMultiplyIntrinsic) return true;
586     break;
587   case vmIntrinsics::_montgomerySquare:
588     if (!UseMontgomerySquareIntrinsic) return true;
589     break;
590   case vmIntrinsics::_bigIntegerRightShiftWorker:
591   case vmIntrinsics::_bigIntegerLeftShiftWorker:
592     break;
593   case vmIntrinsics::_addExactI:
594   case vmIntrinsics::_addExactL:
595   case vmIntrinsics::_decrementExactI:
596   case vmIntrinsics::_decrementExactL:
597   case vmIntrinsics::_incrementExactI:
598   case vmIntrinsics::_incrementExactL:
599   case vmIntrinsics::_multiplyExactI:
600   case vmIntrinsics::_multiplyExactL:
601   case vmIntrinsics::_negateExactI:
602   case vmIntrinsics::_negateExactL:
603   case vmIntrinsics::_subtractExactI:
604   case vmIntrinsics::_subtractExactL:
605     if (!UseMathExactIntrinsics || !InlineMathNatives) return true;
606     break;
607   case vmIntrinsics::_isDigit:
608   case vmIntrinsics::_isLowerCase:
609   case vmIntrinsics::_isUpperCase:
610   case vmIntrinsics::_isWhitespace:
611     if (!UseCharacterCompareIntrinsics) return true;
612     break;
613   case vmIntrinsics::_dcopySign:
614   case vmIntrinsics::_fcopySign:
615     if (!InlineMathNatives || !UseCopySignIntrinsic) return true;
616     break;
617   case vmIntrinsics::_dsignum:
618   case vmIntrinsics::_fsignum:
619     if (!InlineMathNatives || !UseSignumIntrinsic) return true;
620     break;
621 #endif // COMPILER2
622   default:
623     return false;
624   }
625 
626   return false;
627 }
628 
629 #define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
630 static const char* vm_intrinsic_name_bodies =
631   VM_INTRINSICS_DO(VM_INTRINSIC_INITIALIZE,
632                    VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
633 
634 static const char* vm_intrinsic_name_table[vmIntrinsics::number_of_intrinsics()];
635 static TriBoolArray<(size_t)vmIntrinsics::number_of_intrinsics(), int> vm_intrinsic_control_words;
636 
637 void vmIntrinsics::init_vm_intrinsic_name_table() {
638   const char** nt = &vm_intrinsic_name_table[0];
639   char* string = (char*) &vm_intrinsic_name_bodies[0];
640 
641   for (auto index : EnumRange<vmIntrinsicID>{}) {
642     nt[as_int(index)] = string;
643     string += strlen(string); // skip string body
644     string += 1;              // skip trailing null
645   }
646   assert(!strcmp(nt[as_int(vmIntrinsics::_hashCode)], "_hashCode"), "lined up");
647   nt[as_int(vmIntrinsics::_none)] = "_none";
648 }
649 
650 const char* vmIntrinsics::name_at(vmIntrinsics::ID id) {
651   const char** nt = &vm_intrinsic_name_table[0];
652   if (nt[as_int(_none)] == nullptr) {
653     init_vm_intrinsic_name_table();
654   }
655 
656   if (id < ID_LIMIT)
657     return vm_intrinsic_name_table[as_int(id)];
658   else
659     return "(unknown intrinsic)";
660 }
661 
662 vmIntrinsics::ID vmIntrinsics::find_id(const char* name) {
663   const char** nt = &vm_intrinsic_name_table[0];
664   if (nt[as_int(_none)] == nullptr) {
665     init_vm_intrinsic_name_table();
666   }
667 
668   for (auto index : EnumRange<vmIntrinsicID>{}) {
669     if (0 == strcmp(name, nt[as_int(index)])) {
670       return index;
671     }
672   }
673 
674   return _none;
675 }
676 
677 bool vmIntrinsics::is_intrinsic_available(vmIntrinsics::ID id) {
678   return VM_Version::is_intrinsic_supported(id) && !is_disabled_by_flags(id);
679 }
680 
681 bool vmIntrinsics::is_disabled_by_flags(vmIntrinsics::ID id) {
682   assert(id > _none && id < ID_LIMIT, "must be a VM intrinsic");
683 
684   // not initialized yet, process Control/DisableIntrinsic
685   if (vm_intrinsic_control_words[as_int(_none)].is_default()) {
686     for (ControlIntrinsicIter iter(ControlIntrinsic); *iter != nullptr; ++iter) {
687       vmIntrinsics::ID id = vmIntrinsics::find_id(*iter);
688 
689       if (id != vmIntrinsics::_none) {
690         vm_intrinsic_control_words[as_int(id)] = iter.is_enabled() && !disabled_by_jvm_flags(id);
691       }
692     }
693 
694     // Order matters, DisableIntrinsic can overwrite ControlIntrinsic
695     for (ControlIntrinsicIter iter(DisableIntrinsic, true/*disable_all*/); *iter != nullptr; ++iter) {
696       vmIntrinsics::ID id = vmIntrinsics::find_id(*iter);
697 
698       if (id != vmIntrinsics::_none) {
699         vm_intrinsic_control_words[as_int(id)] = false;
700       }
701     }
702 
703     vm_intrinsic_control_words[as_int(_none)] = true;
704   }
705 
706   TriBool b = vm_intrinsic_control_words[as_int(id)];
707   if (b.is_default()) {
708     // unknown yet, query and cache it
709     b = vm_intrinsic_control_words[as_int(id)] = !disabled_by_jvm_flags(id);
710   }
711 
712   return !b;
713 }
714 
715 // These are for forming case labels:
716 #define ID3(x, y, z) (( jlong)(z) +                                  \
717                       ((jlong)(y) <<    vmSymbols::log2_SID_LIMIT) + \
718                       ((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT))  )
719 #define SID_ENUM(n) VM_SYMBOL_ENUM_NAME(n)
720 
721 vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbolID holder,
722                                             vmSymbolID name,
723                                             vmSymbolID sig,
724                                             u2 flags) {
725   assert((int)vmSymbolID::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
726 
727   // Let the C compiler build the decision tree.
728 
729 #define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
730   case ID3(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig)): \
731     if (!match_##fcode(flags))  break; \
732     return id;
733 
734   switch (ID3(holder, name, sig)) {
735     VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
736                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
737   }
738   return vmIntrinsics::_none;
739 
740 #undef VM_INTRINSIC_CASE
741 }
742 
743 class vmIntrinsicsLookup {
744   bool _class_map[vmSymbols::number_of_symbols()];
745 
746   constexpr int as_index(vmSymbolID id) const {
747     int index = vmSymbols::as_int(id);
748     assert(0 <= index && index < int(sizeof(_class_map)), "must be");
749     return index;
750   }
751 
752   constexpr void set_class_map(vmSymbolID id) {
753     _class_map[as_index(id)] = true;
754   }
755 
756 public:
757   constexpr vmIntrinsicsLookup() : _class_map() {
758 
759 #define VM_INTRINSIC_CLASS_MAP(id, klass, name, sig, fcode) \
760     set_class_map(SID_ENUM(klass));
761 
762     VM_INTRINSICS_DO(VM_INTRINSIC_CLASS_MAP,
763                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
764 #undef VM_INTRINSIC_CLASS_MAP
765 
766 
767     // A few slightly irregular cases. See Method::init_intrinsic_id
768     set_class_map(SID_ENUM(java_lang_StrictMath));
769     set_class_map(SID_ENUM(java_lang_invoke_MethodHandle));
770     set_class_map(SID_ENUM(java_lang_invoke_VarHandle));
771   }
772 
773   bool class_has_intrinsics(vmSymbolID holder) const {
774     return _class_map[as_index(holder)];
775   }
776 };
777 
778 constexpr vmIntrinsicsLookup _intrinsics_lookup;
779 
780 bool vmIntrinsics::class_has_intrinsics(vmSymbolID holder) {
781   return _intrinsics_lookup.class_has_intrinsics(holder);
782 }
783 
784 const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf, int buflen) {
785   const char* str = name_at(id);
786 #ifndef PRODUCT
787   const char* kname = vmSymbols::name_for(class_for(id));
788   const char* mname = vmSymbols::name_for(name_for(id));
789   const char* sname = vmSymbols::name_for(signature_for(id));
790   const char* fname = "";
791   switch (flags_for(id)) {
792   case F_Y:  fname = "synchronized ";  break;
793   case F_RN: fname = "native ";        break;
794   case F_SN: fname = "native static "; break;
795   case F_S:  fname = "static ";        break;
796   default:   break;
797   }
798   const char* kptr = strrchr(kname, JVM_SIGNATURE_SLASH);
799   if (kptr != nullptr)  kname = kptr + 1;
800   int len = jio_snprintf(buf, buflen, "%s: %s%s.%s%s",
801                          str, fname, kname, mname, sname);
802   if (len < buflen)
803     str = buf;
804 #endif //PRODUCT
805   return str;
806 }
807 
808 
809 // These are to get information about intrinsics.
810 
811 #define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f))
812 
813 #ifndef PRODUCT
814 static const jlong intrinsic_info_array[vmIntrinsics::number_of_intrinsics()+1] = {
815 #define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \
816   ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode),
817 
818   0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO,
819                      VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE)
820   0
821 #undef VM_INTRINSIC_INFO
822 };
823 
824 inline jlong intrinsic_info(vmIntrinsics::ID id) {
825   return intrinsic_info_array[vmIntrinsics::as_int(id)];
826 }
827 
828 vmSymbolID vmIntrinsics::class_for(vmIntrinsics::ID id) {
829   jlong info = intrinsic_info(id);
830   int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
831   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1021, "");
832   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
833 }
834 
835 vmSymbolID vmIntrinsics::name_for(vmIntrinsics::ID id) {
836   jlong info = intrinsic_info(id);
837   int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
838   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1022, "");
839   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
840 }
841 
842 vmSymbolID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
843   jlong info = intrinsic_info(id);
844   int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
845   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 1023, "");
846   return vmSymbols::as_SID( checked_cast<int>((info >> shift) & mask));
847 }
848 
849 vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
850   jlong info = intrinsic_info(id);
851   int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT);
852   assert(((ID4(1021,1022,1023,7) >> shift) & mask) == 7, "");
853   return Flags( (info >> shift) & mask );
854 }
855 #endif // !PRODUCT