1 /*
2 * Copyright (c) 1997, 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 #ifndef SHARE_UTILITIES_GLOBALDEFINITIONS_HPP
26 #define SHARE_UTILITIES_GLOBALDEFINITIONS_HPP
27
28 #include "utilities/compilerWarnings.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 // Get constants like JVM_T_CHAR and JVM_SIGNATURE_INT, before pulling in <jvm.h>.
33 #include "classfile_constants.h"
34
35 #include COMPILER_HEADER(utilities/globalDefinitions)
36
37 // Defaults for macros that might be defined per compiler.
38 #ifndef NOINLINE
39 #define NOINLINE
40 #endif
41 #ifndef ALWAYSINLINE
42 #define ALWAYSINLINE inline
43 #endif
44
45 #ifndef ATTRIBUTE_ALIGNED
46 #define ATTRIBUTE_ALIGNED(x)
47 #endif
48
49 // These are #defines to selectively turn on/off the Print(Opto)Assembly
50 // capabilities. Choices should be led by a tradeoff between
51 // code size and improved supportability.
52 // if PRINT_ASSEMBLY then PRINT_ABSTRACT_ASSEMBLY must be true as well
53 // to have a fallback in case hsdis is not available.
54 #if defined(PRODUCT)
55 #define SUPPORT_ABSTRACT_ASSEMBLY
56 #define SUPPORT_ASSEMBLY
57 #undef SUPPORT_OPTO_ASSEMBLY // Can't activate. In PRODUCT, many dump methods are missing.
58 #undef SUPPORT_DATA_STRUCTS // Of limited use. In PRODUCT, many print methods are empty.
59 #else
60 #define SUPPORT_ABSTRACT_ASSEMBLY
61 #define SUPPORT_ASSEMBLY
62 #define SUPPORT_OPTO_ASSEMBLY
63 #define SUPPORT_DATA_STRUCTS
64 #endif
65 #if defined(SUPPORT_ASSEMBLY) && !defined(SUPPORT_ABSTRACT_ASSEMBLY)
66 #define SUPPORT_ABSTRACT_ASSEMBLY
67 #endif
68
69 // This file holds all globally used constants & types, class (forward)
70 // declarations and a few frequently used utility functions.
71
72 //----------------------------------------------------------------------------------------------------
73 // Printf-style formatters for fixed- and variable-width types as pointers and
74 // integers. These are derived from the definitions in inttypes.h. If the platform
75 // doesn't provide appropriate definitions, they should be provided in
76 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
77
78 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
79
80 // Format 32-bit quantities.
81 #define INT32_FORMAT "%" PRId32
82 #define UINT32_FORMAT "%" PRIu32
83 #define INT32_FORMAT_W(width) "%" #width PRId32
84 #define UINT32_FORMAT_W(width) "%" #width PRIu32
85
86 #define PTR32_FORMAT "0x%08" PRIx32
87 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
88
89 // Format 64-bit quantities.
90 #define INT64_FORMAT "%" PRId64
91 #define UINT64_FORMAT "%" PRIu64
92 #define UINT64_FORMAT_X "%" PRIx64
93 #define INT64_FORMAT_W(width) "%" #width PRId64
94 #define UINT64_FORMAT_W(width) "%" #width PRIu64
95 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64
96
97 #define PTR64_FORMAT "0x%016" PRIx64
98
99 // Format jlong, if necessary
100 #ifndef JLONG_FORMAT
101 #define JLONG_FORMAT INT64_FORMAT
102 #endif
103 #ifndef JLONG_FORMAT_W
104 #define JLONG_FORMAT_W(width) INT64_FORMAT_W(width)
105 #endif
106 #ifndef JULONG_FORMAT
107 #define JULONG_FORMAT UINT64_FORMAT
108 #endif
109 #ifndef JULONG_FORMAT_X
110 #define JULONG_FORMAT_X UINT64_FORMAT_X
111 #endif
112
113 // Format pointers which change size between 32- and 64-bit.
114 #ifdef _LP64
115 #define INTPTR_FORMAT "0x%016" PRIxPTR
116 #define PTR_FORMAT "0x%016" PRIxPTR
117 #else // !_LP64
118 #define INTPTR_FORMAT "0x%08" PRIxPTR
119 #define PTR_FORMAT "0x%08" PRIxPTR
120 #endif // _LP64
121
122 // Format pointers without leading zeros
123 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
124
125 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
126
127 #define SSIZE_FORMAT "%" PRIdPTR
128 #define SIZE_FORMAT "%" PRIuPTR
129 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
130 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
131 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
132 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
133
134 #define INTX_FORMAT "%" PRIdPTR
135 #define UINTX_FORMAT "%" PRIuPTR
136 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
137 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
138
139 //----------------------------------------------------------------------------------------------------
140 // Constants
141
142 const int LogBytesPerShort = 1;
143 const int LogBytesPerInt = 2;
144 #ifdef _LP64
145 const int LogBytesPerWord = 3;
146 #else
147 const int LogBytesPerWord = 2;
148 #endif
149 const int LogBytesPerLong = 3;
150
151 const int BytesPerShort = 1 << LogBytesPerShort;
152 const int BytesPerInt = 1 << LogBytesPerInt;
153 const int BytesPerWord = 1 << LogBytesPerWord;
154 const int BytesPerLong = 1 << LogBytesPerLong;
155
156 const int LogBitsPerByte = 3;
157 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
158 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
159 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
160 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
161
162 const int BitsPerByte = 1 << LogBitsPerByte;
163 const int BitsPerShort = 1 << LogBitsPerShort;
164 const int BitsPerInt = 1 << LogBitsPerInt;
165 const int BitsPerWord = 1 << LogBitsPerWord;
166 const int BitsPerLong = 1 << LogBitsPerLong;
167
168 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
169 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
170
171 const int WordsPerLong = 2; // Number of stack entries for longs
172
173 const int oopSize = sizeof(char*); // Full-width oop
174 extern int heapOopSize; // Oop within a java object
175 const int wordSize = sizeof(char*);
176 const int longSize = sizeof(jlong);
177 const int jintSize = sizeof(jint);
178 const int size_tSize = sizeof(size_t);
179
180 const int BytesPerOop = BytesPerWord; // Full-width oop
181
182 extern int LogBytesPerHeapOop; // Oop within a java object
183 extern int LogBitsPerHeapOop;
184 extern int BytesPerHeapOop;
185 extern int BitsPerHeapOop;
186
187 const int BitsPerJavaInteger = 32;
188 const int BitsPerJavaLong = 64;
189 const int BitsPerSize_t = size_tSize * BitsPerByte;
190
191 // Size of a char[] needed to represent a jint as a string in decimal.
192 const int jintAsStringSize = 12;
193
194 // An opaque type, so that HeapWord* can be a generic pointer into the heap.
195 // We require that object sizes be measured in units of heap words (e.g.
196 // pointer-sized values), so that given HeapWord* hw,
197 // hw += oop(hw)->foo();
198 // works, where foo is a method (like size or scavenge) that returns the
199 // object size.
200 class HeapWordImpl; // Opaque, never defined.
201 typedef HeapWordImpl* HeapWord;
202
203 // Analogous opaque struct for metadata allocated from metaspaces.
204 class MetaWordImpl; // Opaque, never defined.
205 typedef MetaWordImpl* MetaWord;
206
207 // HeapWordSize must be 2^LogHeapWordSize.
208 const int HeapWordSize = sizeof(HeapWord);
209 #ifdef _LP64
210 const int LogHeapWordSize = 3;
211 #else
212 const int LogHeapWordSize = 2;
213 #endif
214 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
215 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
216
217 // The minimum number of native machine words necessary to contain "byte_size"
218 // bytes.
219 inline size_t heap_word_size(size_t byte_size) {
220 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
221 }
222
223 //-------------------------------------------
224 // Constant for jlong (standardized by C++11)
225
226 // Build a 64bit integer constant
227 #define CONST64(x) (x ## LL)
228 #define UCONST64(x) (x ## ULL)
229
230 const jlong min_jlong = CONST64(0x8000000000000000);
231 const jlong max_jlong = CONST64(0x7fffffffffffffff);
232
233 const size_t K = 1024;
234 const size_t M = K*K;
235 const size_t G = M*K;
236 const size_t HWperKB = K / sizeof(HeapWord);
237
238 // Constants for converting from a base unit to milli-base units. For
239 // example from seconds to milliseconds and microseconds
240
241 const int MILLIUNITS = 1000; // milli units per base unit
242 const int MICROUNITS = 1000000; // micro units per base unit
243 const int NANOUNITS = 1000000000; // nano units per base unit
244
245 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
246 const jint NANOSECS_PER_MILLISEC = 1000000;
247
248 // Proper units routines try to maintain at least three significant digits.
249 // In worst case, it would print five significant digits with lower prefix.
250 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow,
251 // and therefore we need to be careful.
252
253 inline const char* proper_unit_for_byte_size(size_t s) {
254 #ifdef _LP64
255 if (s >= 100*G) {
256 return "G";
257 }
258 #endif
259 if (s >= 100*M) {
260 return "M";
261 } else if (s >= 100*K) {
262 return "K";
263 } else {
264 return "B";
265 }
266 }
267
268 template <class T>
269 inline T byte_size_in_proper_unit(T s) {
270 #ifdef _LP64
271 if (s >= 100*G) {
272 return (T)(s/G);
273 }
274 #endif
275 if (s >= 100*M) {
276 return (T)(s/M);
277 } else if (s >= 100*K) {
278 return (T)(s/K);
279 } else {
280 return s;
281 }
282 }
283
284 inline const char* exact_unit_for_byte_size(size_t s) {
285 #ifdef _LP64
286 if (s >= G && (s % G) == 0) {
287 return "G";
288 }
289 #endif
290 if (s >= M && (s % M) == 0) {
291 return "M";
292 }
293 if (s >= K && (s % K) == 0) {
294 return "K";
295 }
296 return "B";
297 }
298
299 inline size_t byte_size_in_exact_unit(size_t s) {
300 #ifdef _LP64
301 if (s >= G && (s % G) == 0) {
302 return s / G;
303 }
304 #endif
305 if (s >= M && (s % M) == 0) {
306 return s / M;
307 }
308 if (s >= K && (s % K) == 0) {
309 return s / K;
310 }
311 return s;
312 }
313
314 // Memory size transition formatting.
315
316 #define HEAP_CHANGE_FORMAT "%s: " SIZE_FORMAT "K(" SIZE_FORMAT "K)->" SIZE_FORMAT "K(" SIZE_FORMAT "K)"
317
318 #define HEAP_CHANGE_FORMAT_ARGS(_name_, _prev_used_, _prev_capacity_, _used_, _capacity_) \
319 (_name_), (_prev_used_) / K, (_prev_capacity_) / K, (_used_) / K, (_capacity_) / K
320
321 //----------------------------------------------------------------------------------------------------
322 // VM type definitions
323
324 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
325 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
326
327 typedef intptr_t intx;
328 typedef uintptr_t uintx;
329
330 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
331 const intx max_intx = (uintx)min_intx - 1;
332 const uintx max_uintx = (uintx)-1;
333
334 // Table of values:
335 // sizeof intx 4 8
336 // min_intx 0x80000000 0x8000000000000000
337 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
338 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
339
340 typedef unsigned int uint; NEEDS_CLEANUP
341
342
343 //----------------------------------------------------------------------------------------------------
344 // Java type definitions
345
346 // All kinds of 'plain' byte addresses
347 typedef signed char s_char;
348 typedef unsigned char u_char;
349 typedef u_char* address;
350 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
351 // except for some implementations of a C++
352 // linkage pointer to function. Should never
353 // need one of those to be placed in this
354 // type anyway.
355
356 // Utility functions to "portably" (?) bit twiddle pointers
357 // Where portable means keep ANSI C++ compilers quiet
358
359 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
360 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
361
362 // Utility functions to "portably" make cast to/from function pointers.
363
364 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
365 inline address_word castable_address(address x) { return address_word(x) ; }
366 inline address_word castable_address(void* x) { return address_word(x) ; }
367
368 // Pointer subtraction.
369 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
370 // the range we might need to find differences from one end of the heap
371 // to the other.
372 // A typical use might be:
373 // if (pointer_delta(end(), top()) >= size) {
374 // // enough room for an object of size
375 // ...
376 // and then additions like
377 // ... top() + size ...
378 // are safe because we know that top() is at least size below end().
379 inline size_t pointer_delta(const volatile void* left,
380 const volatile void* right,
381 size_t element_size) {
382 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
383 }
384
385 // A version specialized for HeapWord*'s.
386 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
387 return pointer_delta(left, right, sizeof(HeapWord));
388 }
389 // A version specialized for MetaWord*'s.
390 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
391 return pointer_delta(left, right, sizeof(MetaWord));
392 }
393
394 //
395 // ANSI C++ does not allow casting from one pointer type to a function pointer
396 // directly without at best a warning. This macro accomplishes it silently
397 // In every case that is present at this point the value be cast is a pointer
398 // to a C linkage function. In some case the type used for the cast reflects
399 // that linkage and a picky compiler would not complain. In other cases because
400 // there is no convenient place to place a typedef with extern C linkage (i.e
401 // a platform dependent header file) it doesn't. At this point no compiler seems
402 // picky enough to catch these instances (which are few). It is possible that
403 // using templates could fix these for all cases. This use of templates is likely
404 // so far from the middle of the road that it is likely to be problematic in
405 // many C++ compilers.
406 //
407 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
408 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
409
410 // Unsigned byte types for os and stream.hpp
411
412 // Unsigned one, two, four and eigth byte quantities used for describing
413 // the .class file format. See JVM book chapter 4.
414
415 typedef jubyte u1;
416 typedef jushort u2;
417 typedef juint u4;
418 typedef julong u8;
419
420 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
421 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
422 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
423 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
424
425 typedef jbyte s1;
426 typedef jshort s2;
427 typedef jint s4;
428 typedef jlong s8;
429
430 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
431 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
432 const jshort min_jshort = -(1 << 15); // smallest jshort
433 const jshort max_jshort = (1 << 15) - 1; // largest jshort
434
435 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
436 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
437
438 //----------------------------------------------------------------------------------------------------
439 // JVM spec restrictions
440
441 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
442
443 //----------------------------------------------------------------------------------------------------
444 // Object alignment, in units of HeapWords.
445 //
446 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
447 // reference fields can be naturally aligned.
448
449 extern int MinObjAlignment;
450 extern int MinObjAlignmentInBytes;
451 extern int MinObjAlignmentInBytesMask;
452
453 extern int LogMinObjAlignment;
454 extern int LogMinObjAlignmentInBytes;
455
456 const int LogKlassAlignmentInBytes = 3;
457 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
458 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
459 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
460
461 // Maximal size of heap where unscaled compression can be used. Also upper bound
462 // for heap placement: 4GB.
463 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
464 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
465 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
466 extern uint64_t OopEncodingHeapMax;
467
468 // Maximal size of compressed class space. Above this limit compression is not possible.
469 // Also upper bound for placement of zero based class space. (Class space is further limited
470 // to be < 3G, see arguments.cpp.)
471 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
472
473 // Machine dependent stuff
474
475 // The maximum size of the code cache. Can be overridden by targets.
476 #define CODE_CACHE_SIZE_LIMIT (2*G)
477 // Allow targets to reduce the default size of the code cache.
478 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
479
480 #include CPU_HEADER(globalDefinitions)
481
482 // To assure the IRIW property on processors that are not multiple copy
483 // atomic, sync instructions must be issued between volatile reads to
484 // assure their ordering, instead of after volatile stores.
485 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
486 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
487 #ifdef CPU_MULTI_COPY_ATOMIC
488 // Not needed.
489 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
490 #else
491 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment.
492 // Final decision is subject to JEP 188: Java Memory Model Update.
493 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false);
494 #endif
495
496 // The expected size in bytes of a cache line, used to pad data structures.
497 #ifndef DEFAULT_CACHE_LINE_SIZE
498 #define DEFAULT_CACHE_LINE_SIZE 64
499 #endif
500
501
502 //----------------------------------------------------------------------------------------------------
503 // Utility macros for compilers
504 // used to silence compiler warnings
505
506 #define Unused_Variable(var) var
507
508
509 //----------------------------------------------------------------------------------------------------
510 // Miscellaneous
511
512 // 6302670 Eliminate Hotspot __fabsf dependency
513 // All fabs() callers should call this function instead, which will implicitly
514 // convert the operand to double, avoiding a dependency on __fabsf which
515 // doesn't exist in early versions of Solaris 8.
516 inline double fabsd(double value) {
517 return fabs(value);
518 }
519
520 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
521 // is zero, return 0.0.
522 template<typename T>
523 inline double percent_of(T numerator, T denominator) {
524 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
525 }
526
527 //----------------------------------------------------------------------------------------------------
528 // Special casts
529 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
530 typedef union {
531 jfloat f;
532 jint i;
533 } FloatIntConv;
534
535 typedef union {
536 jdouble d;
537 jlong l;
538 julong ul;
539 } DoubleLongConv;
540
541 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
542 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
543
544 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
545 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
546 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
547
548 inline jint low (jlong value) { return jint(value); }
549 inline jint high(jlong value) { return jint(value >> 32); }
550
551 // the fancy casts are a hopefully portable way
552 // to do unsigned 32 to 64 bit type conversion
553 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
554 *value |= (jlong)(julong)(juint)low; }
555
556 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
557 *value |= (jlong)high << 32; }
558
559 inline jlong jlong_from(jint h, jint l) {
560 jlong result = 0; // initialization to avoid warning
561 set_high(&result, h);
562 set_low(&result, l);
563 return result;
564 }
565
566 union jlong_accessor {
567 jint words[2];
568 jlong long_value;
569 };
570
571 void basic_types_init(); // cannot define here; uses assert
572
573
574 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
575 enum BasicType {
576 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS.
577 T_BOOLEAN = JVM_T_BOOLEAN,
578 T_CHAR = JVM_T_CHAR,
579 T_FLOAT = JVM_T_FLOAT,
580 T_DOUBLE = JVM_T_DOUBLE,
581 T_BYTE = JVM_T_BYTE,
582 T_SHORT = JVM_T_SHORT,
583 T_INT = JVM_T_INT,
584 T_LONG = JVM_T_LONG,
585 // The remaining values are not part of any standard.
586 // T_OBJECT and T_VOID denote two more semantic choices
587 // for method return values.
588 // T_OBJECT and T_ARRAY describe signature syntax.
589 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe
590 // internal references within the JVM as if they were Java
591 // types in their own right.
592 T_OBJECT = 12,
593 T_ARRAY = 13,
594 T_VOID = 14,
595 T_ADDRESS = 15,
596 T_NARROWOOP = 16,
597 T_METADATA = 17,
598 T_NARROWKLASS = 18,
599 T_CONFLICT = 19, // for stack value type with conflicting contents
600 T_ILLEGAL = 99
601 };
602
603 inline bool is_java_primitive(BasicType t) {
604 return T_BOOLEAN <= t && t <= T_LONG;
605 }
606
607 inline bool is_subword_type(BasicType t) {
608 // these guys are processed exactly like T_INT in calling sequences:
609 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
610 }
611
612 inline bool is_signed_subword_type(BasicType t) {
613 return (t == T_BYTE || t == T_SHORT);
614 }
615
616 inline bool is_double_word_type(BasicType t) {
617 return (t == T_DOUBLE || t == T_LONG);
618 }
619
620 inline bool is_reference_type(BasicType t) {
621 return (t == T_OBJECT || t == T_ARRAY);
622 }
623
624 // Convert a char from a classfile signature to a BasicType
625 inline BasicType char2type(char c) {
626 switch( c ) {
627 case JVM_SIGNATURE_BYTE: return T_BYTE;
628 case JVM_SIGNATURE_CHAR: return T_CHAR;
629 case JVM_SIGNATURE_DOUBLE: return T_DOUBLE;
630 case JVM_SIGNATURE_FLOAT: return T_FLOAT;
631 case JVM_SIGNATURE_INT: return T_INT;
632 case JVM_SIGNATURE_LONG: return T_LONG;
633 case JVM_SIGNATURE_SHORT: return T_SHORT;
634 case JVM_SIGNATURE_BOOLEAN: return T_BOOLEAN;
635 case JVM_SIGNATURE_VOID: return T_VOID;
636 case JVM_SIGNATURE_CLASS: return T_OBJECT;
637 case JVM_SIGNATURE_ARRAY: return T_ARRAY;
638 }
639 return T_ILLEGAL;
640 }
641
642 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
643 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
644 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
645 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
646 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
647 extern BasicType name2type(const char* name);
648
649 // Auxiliary math routines
650 // least common multiple
651 extern size_t lcm(size_t a, size_t b);
652
653
654 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
655 enum BasicTypeSize {
656 T_BOOLEAN_size = 1,
657 T_CHAR_size = 1,
658 T_FLOAT_size = 1,
659 T_DOUBLE_size = 2,
660 T_BYTE_size = 1,
661 T_SHORT_size = 1,
662 T_INT_size = 1,
663 T_LONG_size = 2,
664 T_OBJECT_size = 1,
665 T_ARRAY_size = 1,
666 T_NARROWOOP_size = 1,
667 T_NARROWKLASS_size = 1,
668 T_VOID_size = 0
669 };
670
671
672 // maps a BasicType to its instance field storage type:
673 // all sub-word integral types are widened to T_INT
674 extern BasicType type2field[T_CONFLICT+1];
675 extern BasicType type2wfield[T_CONFLICT+1];
676
677
678 // size in bytes
679 enum ArrayElementSize {
680 T_BOOLEAN_aelem_bytes = 1,
681 T_CHAR_aelem_bytes = 2,
682 T_FLOAT_aelem_bytes = 4,
683 T_DOUBLE_aelem_bytes = 8,
684 T_BYTE_aelem_bytes = 1,
685 T_SHORT_aelem_bytes = 2,
686 T_INT_aelem_bytes = 4,
687 T_LONG_aelem_bytes = 8,
688 #ifdef _LP64
689 T_OBJECT_aelem_bytes = 8,
690 T_ARRAY_aelem_bytes = 8,
691 #else
692 T_OBJECT_aelem_bytes = 4,
693 T_ARRAY_aelem_bytes = 4,
694 #endif
695 T_NARROWOOP_aelem_bytes = 4,
696 T_NARROWKLASS_aelem_bytes = 4,
697 T_VOID_aelem_bytes = 0
698 };
699
700 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
701 #ifdef ASSERT
702 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
703 #else
704 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
705 #endif
706
707
708 // JavaValue serves as a container for arbitrary Java values.
709
710 class JavaValue {
711
712 public:
713 typedef union JavaCallValue {
714 jfloat f;
715 jdouble d;
716 jint i;
717 jlong l;
718 jobject h;
719 } JavaCallValue;
720
721 private:
722 BasicType _type;
723 JavaCallValue _value;
724
725 public:
726 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
727
728 JavaValue(jfloat value) {
729 _type = T_FLOAT;
730 _value.f = value;
731 }
732
733 JavaValue(jdouble value) {
734 _type = T_DOUBLE;
735 _value.d = value;
736 }
737
738 jfloat get_jfloat() const { return _value.f; }
739 jdouble get_jdouble() const { return _value.d; }
740 jint get_jint() const { return _value.i; }
741 jlong get_jlong() const { return _value.l; }
742 jobject get_jobject() const { return _value.h; }
743 JavaCallValue* get_value_addr() { return &_value; }
744 BasicType get_type() const { return _type; }
745
746 void set_jfloat(jfloat f) { _value.f = f;}
747 void set_jdouble(jdouble d) { _value.d = d;}
748 void set_jint(jint i) { _value.i = i;}
749 void set_jlong(jlong l) { _value.l = l;}
750 void set_jobject(jobject h) { _value.h = h;}
751 void set_type(BasicType t) { _type = t; }
752
753 jboolean get_jboolean() const { return (jboolean) (_value.i);}
754 jbyte get_jbyte() const { return (jbyte) (_value.i);}
755 jchar get_jchar() const { return (jchar) (_value.i);}
756 jshort get_jshort() const { return (jshort) (_value.i);}
757
758 };
759
760
761 #define STACK_BIAS 0
762 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
763 // in order to extend the reach of the stack pointer.
764 #if defined(SPARC) && defined(_LP64)
765 #undef STACK_BIAS
766 #define STACK_BIAS 0x7ff
767 #endif
768
769
770 // TosState describes the top-of-stack state before and after the execution of
771 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
772 // registers. The TosState corresponds to the 'machine representation' of this cached
773 // value. There's 4 states corresponding to the JAVA types int, long, float & double
774 // as well as a 5th state in case the top-of-stack value is actually on the top
775 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
776 // state when it comes to machine representation but is used separately for (oop)
777 // type specific operations (e.g. verification code).
778
779 enum TosState { // describes the tos cache contents
780 btos = 0, // byte, bool tos cached
781 ztos = 1, // byte, bool tos cached
782 ctos = 2, // char tos cached
783 stos = 3, // short tos cached
784 itos = 4, // int tos cached
785 ltos = 5, // long tos cached
786 ftos = 6, // float tos cached
787 dtos = 7, // double tos cached
788 atos = 8, // object cached
789 vtos = 9, // tos not cached
790 number_of_states,
791 ilgl // illegal state: should not occur
792 };
793
794
795 inline TosState as_TosState(BasicType type) {
796 switch (type) {
797 case T_BYTE : return btos;
798 case T_BOOLEAN: return ztos;
799 case T_CHAR : return ctos;
800 case T_SHORT : return stos;
801 case T_INT : return itos;
802 case T_LONG : return ltos;
803 case T_FLOAT : return ftos;
804 case T_DOUBLE : return dtos;
805 case T_VOID : return vtos;
806 case T_ARRAY : // fall through
807 case T_OBJECT : return atos;
808 default : return ilgl;
809 }
810 }
811
812 inline BasicType as_BasicType(TosState state) {
813 switch (state) {
814 case btos : return T_BYTE;
815 case ztos : return T_BOOLEAN;
816 case ctos : return T_CHAR;
817 case stos : return T_SHORT;
818 case itos : return T_INT;
819 case ltos : return T_LONG;
820 case ftos : return T_FLOAT;
821 case dtos : return T_DOUBLE;
822 case atos : return T_OBJECT;
823 case vtos : return T_VOID;
824 default : return T_ILLEGAL;
825 }
826 }
827
828
829 // Helper function to convert BasicType info into TosState
830 // Note: Cannot define here as it uses global constant at the time being.
831 TosState as_TosState(BasicType type);
832
833
834 // JavaThreadState keeps track of which part of the code a thread is executing in. This
835 // information is needed by the safepoint code.
836 //
837 // There are 4 essential states:
838 //
839 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
840 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
841 // _thread_in_vm : Executing in the vm
842 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
843 //
844 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
845 // a transition from one state to another. These extra states makes it possible for the safepoint code to
846 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
847 //
848 // Given a state, the xxxx_trans state can always be found by adding 1.
849 //
850 enum JavaThreadState {
851 _thread_uninitialized = 0, // should never happen (missing initialization)
852 _thread_new = 2, // just starting up, i.e., in process of being initialized
853 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
854 _thread_in_native = 4, // running in native code
855 _thread_in_native_trans = 5, // corresponding transition state
856 _thread_in_vm = 6, // running in VM
857 _thread_in_vm_trans = 7, // corresponding transition state
858 _thread_in_Java = 8, // running in Java or in stub code
859 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
860 _thread_blocked = 10, // blocked in vm
861 _thread_blocked_trans = 11, // corresponding transition state
862 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
863 };
864
865 //----------------------------------------------------------------------------------------------------
866 // Special constants for debugging
867
868 const jint badInt = -3; // generic "bad int" value
869 const intptr_t badAddressVal = -2; // generic "bad address" value
870 const intptr_t badOopVal = -1; // generic "bad oop" value
871 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
872 const int badStackSegVal = 0xCA; // value used to zap stack segments
873 const int badHandleValue = 0xBC; // value used to zap vm handle area
874 const int badResourceValue = 0xAB; // value used to zap resource area
875 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
876 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
877 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
878 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
879 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
880 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
881 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
882
883
884 // (These must be implemented as #defines because C++ compilers are
885 // not obligated to inline non-integral constants!)
886 #define badAddress ((address)::badAddressVal)
887 #define badOop (cast_to_oop(::badOopVal))
888 #define badHeapWord (::badHeapWordVal)
889
890 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
891 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
892
893 //----------------------------------------------------------------------------------------------------
894 // Utility functions for bitfield manipulations
895
896 const intptr_t AllBits = ~0; // all bits set in a word
897 const intptr_t NoBits = 0; // no bits set in a word
898 const jlong NoLongBits = 0; // no bits set in a long
899 const intptr_t OneBit = 1; // only right_most bit set in a word
900
901 // get a word with the n.th or the right-most or left-most n bits set
902 // (note: #define used only so that they can be used in enum constant definitions)
903 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
904 #define right_n_bits(n) (nth_bit(n) - 1)
905 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
906
907 // bit-operations using a mask m
908 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
909 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
910 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
911 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
912 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
913
914 // bit-operations using the n.th bit
915 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
916 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
917 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
918
919 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
920 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
921 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
922 }
923
924
925 //----------------------------------------------------------------------------------------------------
926 // Utility functions for integers
927
928 // Avoid use of global min/max macros which may cause unwanted double
929 // evaluation of arguments.
930 #ifdef max
931 #undef max
932 #endif
933
934 #ifdef min
935 #undef min
936 #endif
937
938 // It is necessary to use templates here. Having normal overloaded
939 // functions does not work because it is necessary to provide both 32-
940 // and 64-bit overloaded functions, which does not work, and having
941 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
942 // will be even more error-prone than macros.
943 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
944 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
945 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
946 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
947 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
948 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
949
950 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
951
952 // true if x is a power of 2, false otherwise
953 inline bool is_power_of_2(intptr_t x) {
954 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
955 }
956
957 // long version of is_power_of_2
958 inline bool is_power_of_2_long(jlong x) {
959 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
960 }
961
962 // Returns largest i such that 2^i <= x.
963 // If x == 0, the function returns -1.
964 inline int log2_intptr(uintptr_t x) {
965 int i = -1;
966 uintptr_t p = 1;
967 while (p != 0 && p <= x) {
968 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
969 i++; p *= 2;
970 }
971 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
972 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
973 return i;
974 }
975
976 //* largest i such that 2^i <= x
977 inline int log2_long(julong x) {
978 int i = -1;
979 julong p = 1;
980 while (p != 0 && p <= x) {
981 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
982 i++; p *= 2;
983 }
984 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
985 // (if p = 0 then overflow occurred and i = 63)
986 return i;
987 }
988
989 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
990 inline int log2_intptr(intptr_t x) {
991 return log2_intptr((uintptr_t)x);
992 }
993
994 inline int log2_int(int x) {
995 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
996 return log2_intptr((uintptr_t)x);
997 }
998
999 inline int log2_jint(jint x) {
1000 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1001 return log2_intptr((uintptr_t)x);
1002 }
1003
1004 inline int log2_uint(uint x) {
1005 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1006 return log2_intptr((uintptr_t)x);
1007 }
1008
1009 // A negative value of 'x' will return '63'
1010 inline int log2_jlong(jlong x) {
1011 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1012 return log2_long((julong)x);
1013 }
1014
1015 //* the argument must be exactly a power of 2
1016 inline int exact_log2(intptr_t x) {
1017 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1018 return log2_intptr(x);
1019 }
1020
1021 //* the argument must be exactly a power of 2
1022 inline int exact_log2_long(jlong x) {
1023 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1024 return log2_long(x);
1025 }
1026
1027 inline bool is_odd (intx x) { return x & 1; }
1028 inline bool is_even(intx x) { return !is_odd(x); }
1029
1030 // abs methods which cannot overflow and so are well-defined across
1031 // the entire domain of integer types.
1032 static inline unsigned int uabs(unsigned int n) {
1033 union {
1034 unsigned int result;
1035 int value;
1036 };
1037 result = n;
1038 if (value < 0) result = 0-result;
1039 return result;
1040 }
1041 static inline julong uabs(julong n) {
1042 union {
1043 julong result;
1044 jlong value;
1045 };
1046 result = n;
1047 if (value < 0) result = 0-result;
1048 return result;
1049 }
1050 static inline julong uabs(jlong n) { return uabs((julong)n); }
1051 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1052
1053 // "to" should be greater than "from."
1054 inline intx byte_size(void* from, void* to) {
1055 return (address)to - (address)from;
1056 }
1057
1058
1059 // Pack and extract shorts to/from ints:
1060
1061 inline int extract_low_short_from_int(jint x) {
1062 return x & 0xffff;
1063 }
1064
1065 inline int extract_high_short_from_int(jint x) {
1066 return (x >> 16) & 0xffff;
1067 }
1068
1069 inline int build_int_from_shorts( jushort low, jushort high ) {
1070 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1071 }
1072
1073 // Convert pointer to intptr_t, for use in printing pointers.
1074 inline intptr_t p2i(const void * p) {
1075 return (intptr_t) p;
1076 }
1077
1078 // swap a & b
1079 template<class T> static void swap(T& a, T& b) {
1080 T tmp = a;
1081 a = b;
1082 b = tmp;
1083 }
1084
1085 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1086
1087 //----------------------------------------------------------------------------------------------------
1088 // Sum and product which can never overflow: they wrap, just like the
1089 // Java operations. Note that we don't intend these to be used for
1090 // general-purpose arithmetic: their purpose is to emulate Java
1091 // operations.
1092
1093 // The goal of this code to avoid undefined or implementation-defined
1094 // behavior. The use of an lvalue to reference cast is explicitly
1095 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1096 // 15 in C++03]
1097 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1098 inline TYPE NAME (TYPE in1, TYPE in2) { \
1099 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1100 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1101 return reinterpret_cast<TYPE&>(ures); \
1102 }
1103
1104 JAVA_INTEGER_OP(+, java_add, jint, juint)
1105 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1106 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1107 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1108 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1109 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1110
1111 #undef JAVA_INTEGER_OP
1112
1113 //----------------------------------------------------------------------------------------------------
1114 // The goal of this code is to provide saturating operations for int/uint.
1115 // Checks overflow conditions and saturates the result to min_jint/max_jint.
1116 #define SATURATED_INTEGER_OP(OP, NAME, TYPE1, TYPE2) \
1117 inline int NAME (TYPE1 in1, TYPE2 in2) { \
1118 jlong res = static_cast<jlong>(in1); \
1119 res OP ## = static_cast<jlong>(in2); \
1120 if (res > max_jint) { \
1121 res = max_jint; \
1122 } else if (res < min_jint) { \
1123 res = min_jint; \
1124 } \
1125 return static_cast<int>(res); \
1126 }
1127
1128 SATURATED_INTEGER_OP(+, saturated_add, int, int)
1129 SATURATED_INTEGER_OP(+, saturated_add, int, uint)
1130 SATURATED_INTEGER_OP(+, saturated_add, uint, int)
1131 SATURATED_INTEGER_OP(+, saturated_add, uint, uint)
1132
1133 #undef SATURATED_INTEGER_OP
1134
1135 // Dereference vptr
1136 // All C++ compilers that we know of have the vtbl pointer in the first
1137 // word. If there are exceptions, this function needs to be made compiler
1138 // specific.
1139 static inline void* dereference_vptr(const void* addr) {
1140 return *(void**)addr;
1141 }
1142
1143 //----------------------------------------------------------------------------------------------------
1144 // String type aliases used by command line flag declarations and
1145 // processing utilities.
1146
1147 typedef const char* ccstr;
1148 typedef const char* ccstrlist; // represents string arguments which accumulate
1149
1150 //----------------------------------------------------------------------------------------------------
1151 // Default hash/equals functions used by ResourceHashtable and KVHashtable
1152
1153 template<typename K> unsigned primitive_hash(const K& k) {
1154 unsigned hash = (unsigned)((uintptr_t)k);
1155 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs
1156 }
1157
1158 template<typename K> bool primitive_equals(const K& k0, const K& k1) {
1159 return k0 == k1;
1160 }
1161
1162
1163 #endif // SHARE_UTILITIES_GLOBALDEFINITIONS_HPP