1 /*
2 * Copyright (c) 1997, 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 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
27
28 #include "utilities/compilerWarnings.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 #include COMPILER_HEADER(utilities/globalDefinitions)
33
34 // Defaults for macros that might be defined per compiler.
35 #ifndef NOINLINE
36 #define NOINLINE
37 #endif
38 #ifndef ALWAYSINLINE
39 #define ALWAYSINLINE inline
40 #endif
41
42 // This file holds all globally used constants & types, class (forward)
43 // declarations and a few frequently used utility functions.
44
45 //----------------------------------------------------------------------------------------------------
46 // Printf-style formatters for fixed- and variable-width types as pointers and
47 // integers. These are derived from the definitions in inttypes.h. If the platform
48 // doesn't provide appropriate definitions, they should be provided in
49 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
50
51 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
52
53 // Format 32-bit quantities.
54 #define INT32_FORMAT "%" PRId32
55 #define UINT32_FORMAT "%" PRIu32
56 #define INT32_FORMAT_W(width) "%" #width PRId32
57 #define UINT32_FORMAT_W(width) "%" #width PRIu32
58
59 #define PTR32_FORMAT "0x%08" PRIx32
60 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
61
62 // Format 64-bit quantities.
63 #define INT64_FORMAT "%" PRId64
64 #define UINT64_FORMAT "%" PRIu64
65 #define UINT64_FORMAT_X "%" PRIx64
66 #define INT64_FORMAT_W(width) "%" #width PRId64
67 #define UINT64_FORMAT_W(width) "%" #width PRIu64
68
69 #define PTR64_FORMAT "0x%016" PRIx64
70
71 // Format jlong, if necessary
72 #ifndef JLONG_FORMAT
73 #define JLONG_FORMAT INT64_FORMAT
74 #endif
75 #ifndef JULONG_FORMAT
76 #define JULONG_FORMAT UINT64_FORMAT
77 #endif
78 #ifndef JULONG_FORMAT_X
79 #define JULONG_FORMAT_X UINT64_FORMAT_X
80 #endif
81
82 // Format pointers which change size between 32- and 64-bit.
83 #ifdef _LP64
84 #define INTPTR_FORMAT "0x%016" PRIxPTR
85 #define PTR_FORMAT "0x%016" PRIxPTR
86 #else // !_LP64
87 #define INTPTR_FORMAT "0x%08" PRIxPTR
88 #define PTR_FORMAT "0x%08" PRIxPTR
89 #endif // _LP64
90
91 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
92
93 #define SSIZE_FORMAT "%" PRIdPTR
94 #define SIZE_FORMAT "%" PRIuPTR
95 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
96 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
97 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
98 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
99
100 #define INTX_FORMAT "%" PRIdPTR
101 #define UINTX_FORMAT "%" PRIuPTR
102 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
103 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
104
105 //----------------------------------------------------------------------------------------------------
106 // Constants
107
108 const int LogBytesPerShort = 1;
109 const int LogBytesPerInt = 2;
110 #ifdef _LP64
111 const int LogBytesPerWord = 3;
112 #else
113 const int LogBytesPerWord = 2;
114 #endif
115 const int LogBytesPerLong = 3;
116
117 const int BytesPerShort = 1 << LogBytesPerShort;
118 const int BytesPerInt = 1 << LogBytesPerInt;
119 const int BytesPerWord = 1 << LogBytesPerWord;
120 const int BytesPerLong = 1 << LogBytesPerLong;
121
122 const int LogBitsPerByte = 3;
123 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
124 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
125 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
126 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
127
128 const int BitsPerByte = 1 << LogBitsPerByte;
129 const int BitsPerShort = 1 << LogBitsPerShort;
130 const int BitsPerInt = 1 << LogBitsPerInt;
131 const int BitsPerWord = 1 << LogBitsPerWord;
132 const int BitsPerLong = 1 << LogBitsPerLong;
133
134 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
135 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
136
137 const int WordsPerLong = 2; // Number of stack entries for longs
138
139 const int oopSize = sizeof(char*); // Full-width oop
140 extern int heapOopSize; // Oop within a java object
141 const int wordSize = sizeof(char*);
142 const int longSize = sizeof(jlong);
143 const int jintSize = sizeof(jint);
144 const int size_tSize = sizeof(size_t);
145
146 const int BytesPerOop = BytesPerWord; // Full-width oop
147
148 extern int LogBytesPerHeapOop; // Oop within a java object
149 extern int LogBitsPerHeapOop;
150 extern int BytesPerHeapOop;
151 extern int BitsPerHeapOop;
152
153 const int BitsPerJavaInteger = 32;
154 const int BitsPerJavaLong = 64;
155 const int BitsPerSize_t = size_tSize * BitsPerByte;
156
157 // Size of a char[] needed to represent a jint as a string in decimal.
158 const int jintAsStringSize = 12;
159
160 // In fact this should be
161 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
162 // see os::set_memory_serialize_page()
163 #ifdef _LP64
164 const int SerializePageShiftCount = 4;
165 #else
166 const int SerializePageShiftCount = 3;
167 #endif
168
169 // An opaque struct of heap-word width, so that HeapWord* can be a generic
170 // pointer into the heap. We require that object sizes be measured in
171 // units of heap words, so that that
172 // HeapWord* hw;
173 // hw += oop(hw)->foo();
174 // works, where foo is a method (like size or scavenge) that returns the
175 // object size.
176 class HeapWord {
177 friend class VMStructs;
178 private:
179 char* i;
180 #ifndef PRODUCT
181 public:
182 char* value() { return i; }
183 #endif
184 };
185
186 // Analogous opaque struct for metadata allocated from
187 // metaspaces.
188 class MetaWord {
189 private:
190 char* i;
191 };
192
193 // HeapWordSize must be 2^LogHeapWordSize.
194 const int HeapWordSize = sizeof(HeapWord);
195 #ifdef _LP64
196 const int LogHeapWordSize = 3;
197 #else
198 const int LogHeapWordSize = 2;
199 #endif
200 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
201 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
202
203 // The larger HeapWordSize for 64bit requires larger heaps
204 // for the same application running in 64bit. See bug 4967770.
205 // The minimum alignment to a heap word size is done. Other
206 // parts of the memory system may require additional alignment
207 // and are responsible for those alignments.
208 #ifdef _LP64
209 #define ScaleForWordSize(x) align_size_down_((x) * 13 / 10, HeapWordSize)
210 #else
211 #define ScaleForWordSize(x) (x)
212 #endif
213
214 // The minimum number of native machine words necessary to contain "byte_size"
215 // bytes.
216 inline size_t heap_word_size(size_t byte_size) {
217 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
218 }
219
220 //-------------------------------------------
221 // Constant for jlong (standardized by C++11)
222
223 // Build a 64bit integer constant
224 #define CONST64(x) (x ## LL)
225 #define UCONST64(x) (x ## ULL)
226
227 const jlong min_jlong = CONST64(0x8000000000000000);
228 const jlong max_jlong = CONST64(0x7fffffffffffffff);
229
230 const size_t K = 1024;
231 const size_t M = K*K;
232 const size_t G = M*K;
233 const size_t HWperKB = K / sizeof(HeapWord);
234
235 // Constants for converting from a base unit to milli-base units. For
236 // example from seconds to milliseconds and microseconds
237
238 const int MILLIUNITS = 1000; // milli units per base unit
239 const int MICROUNITS = 1000000; // micro units per base unit
240 const int NANOUNITS = 1000000000; // nano units per base unit
241
242 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
243 const jint NANOSECS_PER_MILLISEC = 1000000;
244
245 inline const char* proper_unit_for_byte_size(size_t s) {
246 #ifdef _LP64
247 if (s >= 10*G) {
248 return "G";
249 }
250 #endif
251 if (s >= 10*M) {
252 return "M";
253 } else if (s >= 10*K) {
254 return "K";
255 } else {
256 return "B";
257 }
258 }
259
260 template <class T>
261 inline T byte_size_in_proper_unit(T s) {
262 #ifdef _LP64
263 if (s >= 10*G) {
264 return (T)(s/G);
265 }
266 #endif
267 if (s >= 10*M) {
268 return (T)(s/M);
269 } else if (s >= 10*K) {
270 return (T)(s/K);
271 } else {
272 return s;
273 }
274 }
275
276 inline const char* exact_unit_for_byte_size(size_t s) {
277 #ifdef _LP64
278 if (s >= G && (s % G) == 0) {
279 return "G";
280 }
281 #endif
282 if (s >= M && (s % M) == 0) {
283 return "M";
284 }
285 if (s >= K && (s % K) == 0) {
286 return "K";
287 }
288 return "B";
289 }
290
291 inline size_t byte_size_in_exact_unit(size_t s) {
292 #ifdef _LP64
293 if (s >= G && (s % G) == 0) {
294 return s / G;
295 }
296 #endif
297 if (s >= M && (s % M) == 0) {
298 return s / M;
299 }
300 if (s >= K && (s % K) == 0) {
301 return s / K;
302 }
303 return s;
304 }
305
306 //----------------------------------------------------------------------------------------------------
307 // VM type definitions
308
309 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
310 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
311
312 typedef intptr_t intx;
313 typedef uintptr_t uintx;
314
315 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
316 const intx max_intx = (uintx)min_intx - 1;
317 const uintx max_uintx = (uintx)-1;
318
319 // Table of values:
320 // sizeof intx 4 8
321 // min_intx 0x80000000 0x8000000000000000
322 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
323 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
324
325 typedef unsigned int uint; NEEDS_CLEANUP
326
327
328 //----------------------------------------------------------------------------------------------------
329 // Java type definitions
330
331 // All kinds of 'plain' byte addresses
332 typedef signed char s_char;
333 typedef unsigned char u_char;
334 typedef u_char* address;
335 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
336 // except for some implementations of a C++
337 // linkage pointer to function. Should never
338 // need one of those to be placed in this
339 // type anyway.
340
341 // Utility functions to "portably" (?) bit twiddle pointers
342 // Where portable means keep ANSI C++ compilers quiet
343
344 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
345 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
346
347 // Utility functions to "portably" make cast to/from function pointers.
348
349 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
350 inline address_word castable_address(address x) { return address_word(x) ; }
351 inline address_word castable_address(void* x) { return address_word(x) ; }
352
353 // Pointer subtraction.
354 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
355 // the range we might need to find differences from one end of the heap
356 // to the other.
357 // A typical use might be:
358 // if (pointer_delta(end(), top()) >= size) {
359 // // enough room for an object of size
360 // ...
361 // and then additions like
362 // ... top() + size ...
363 // are safe because we know that top() is at least size below end().
364 inline size_t pointer_delta(const volatile void* left,
365 const volatile void* right,
366 size_t element_size) {
367 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
368 }
369
370 // A version specialized for HeapWord*'s.
371 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
372 return pointer_delta(left, right, sizeof(HeapWord));
373 }
374 // A version specialized for MetaWord*'s.
375 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
376 return pointer_delta(left, right, sizeof(MetaWord));
377 }
378
379 //
380 // ANSI C++ does not allow casting from one pointer type to a function pointer
381 // directly without at best a warning. This macro accomplishes it silently
382 // In every case that is present at this point the value be cast is a pointer
383 // to a C linkage function. In some case the type used for the cast reflects
384 // that linkage and a picky compiler would not complain. In other cases because
385 // there is no convenient place to place a typedef with extern C linkage (i.e
386 // a platform dependent header file) it doesn't. At this point no compiler seems
387 // picky enough to catch these instances (which are few). It is possible that
388 // using templates could fix these for all cases. This use of templates is likely
389 // so far from the middle of the road that it is likely to be problematic in
390 // many C++ compilers.
391 //
392 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
393 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
394
395 // Unsigned byte types for os and stream.hpp
396
397 // Unsigned one, two, four and eigth byte quantities used for describing
398 // the .class file format. See JVM book chapter 4.
399
400 typedef jubyte u1;
401 typedef jushort u2;
402 typedef juint u4;
403 typedef julong u8;
404
405 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
406 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
407 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
408 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
409
410 typedef jbyte s1;
411 typedef jshort s2;
412 typedef jint s4;
413 typedef jlong s8;
414
415 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
416 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
417 const jshort min_jshort = -(1 << 15); // smallest jshort
418 const jshort max_jshort = (1 << 15) - 1; // largest jshort
419
420 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
421 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
422
423 //----------------------------------------------------------------------------------------------------
424 // JVM spec restrictions
425
426 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
427
428 // Default ProtectionDomainCacheSize values
429
430 const int defaultProtectionDomainCacheSize = NOT_LP64(137) LP64_ONLY(2017);
431
432 //----------------------------------------------------------------------------------------------------
433 // Default and minimum StringTableSize values
434
435 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013);
436 const int minimumStringTableSize = 1009;
437
438 const int defaultSymbolTableSize = 20011;
439 const int minimumSymbolTableSize = 1009;
440
441
442 //----------------------------------------------------------------------------------------------------
443 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
444 //
445 // Determines whether on-the-fly class replacement and frame popping are enabled.
446
447 #define HOTSWAP
448
449 //----------------------------------------------------------------------------------------------------
450 // Object alignment, in units of HeapWords.
451 //
452 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
453 // reference fields can be naturally aligned.
454
455 extern int MinObjAlignment;
456 extern int MinObjAlignmentInBytes;
457 extern int MinObjAlignmentInBytesMask;
458
459 extern int LogMinObjAlignment;
460 extern int LogMinObjAlignmentInBytes;
461
462 const int LogKlassAlignmentInBytes = 3;
463 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
464 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
465 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
466
467 // Maximal size of heap where unscaled compression can be used. Also upper bound
468 // for heap placement: 4GB.
469 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
470 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
471 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
472 extern uint64_t OopEncodingHeapMax;
473
474 // Maximal size of compressed class space. Above this limit compression is not possible.
475 // Also upper bound for placement of zero based class space. (Class space is further limited
476 // to be < 3G, see arguments.cpp.)
477 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
478
479 // Machine dependent stuff
480
481 // The maximum size of the code cache. Can be overridden by targets.
482 #define CODE_CACHE_SIZE_LIMIT (2*G)
483 // Allow targets to reduce the default size of the code cache.
484 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
485
486 #include CPU_HEADER(globalDefinitions)
487
488 // To assure the IRIW property on processors that are not multiple copy
489 // atomic, sync instructions must be issued between volatile reads to
490 // assure their ordering, instead of after volatile stores.
491 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
492 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
493 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
494 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
495 #else
496 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
497 #endif
498
499 // The byte alignment to be used by Arena::Amalloc. See bugid 4169348.
500 // Note: this value must be a power of 2
501
502 #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
503
504 // Signed variants of alignment helpers. There are two versions of each, a macro
505 // for use in places like enum definitions that require compile-time constant
506 // expressions and a function for all other places so as to get type checking.
507
508 #define align_size_up_(size, alignment) (((size) + ((alignment) - 1)) & ~((alignment) - 1))
509
510 inline bool is_size_aligned(size_t size, size_t alignment) {
511 return align_size_up_(size, alignment) == size;
512 }
513
514 inline bool is_ptr_aligned(const void* ptr, size_t alignment) {
515 return align_size_up_((intptr_t)ptr, (intptr_t)alignment) == (intptr_t)ptr;
516 }
517
518 inline intptr_t align_size_up(intptr_t size, intptr_t alignment) {
519 return align_size_up_(size, alignment);
520 }
521
522 #define align_size_down_(size, alignment) ((size) & ~((alignment) - 1))
523
524 inline intptr_t align_size_down(intptr_t size, intptr_t alignment) {
525 return align_size_down_(size, alignment);
526 }
527
528 #define is_size_aligned_(size, alignment) ((size) == (align_size_up_(size, alignment)))
529
530 inline void* align_ptr_up(const void* ptr, size_t alignment) {
531 return (void*)align_size_up((intptr_t)ptr, (intptr_t)alignment);
532 }
533
534 inline void* align_ptr_down(void* ptr, size_t alignment) {
535 return (void*)align_size_down((intptr_t)ptr, (intptr_t)alignment);
536 }
537
538 inline volatile void* align_ptr_down(volatile void* ptr, size_t alignment) {
539 return (volatile void*)align_size_down((intptr_t)ptr, (intptr_t)alignment);
540 }
541
542 // Align metaspace objects by rounding up to natural word boundary
543
544 inline intptr_t align_metadata_size(intptr_t size) {
545 return align_size_up(size, 1);
546 }
547
548 // Align objects in the Java Heap by rounding up their size, in HeapWord units.
549 // Since the size is given in words this is somewhat of a nop, but
550 // distinguishes it from align_object_size.
551 inline intptr_t align_object_size(intptr_t size) {
552 return align_size_up(size, MinObjAlignment);
553 }
554
555 inline bool is_object_aligned(intptr_t addr) {
556 return addr == align_object_size(addr);
557 }
558
559 inline bool is_ptr_object_aligned(const void* addr) {
560 return is_ptr_aligned(addr, MinObjAlignmentInBytes);
561 }
562
563 // Pad out certain offsets to jlong alignment, in HeapWord units.
564
565 inline intptr_t align_object_offset(intptr_t offset) {
566 return align_size_up(offset, HeapWordsPerLong);
567 }
568
569 // Align down with a lower bound. If the aligning results in 0, return 'alignment'.
570
571 inline size_t align_size_down_bounded(size_t size, size_t alignment) {
572 size_t aligned_size = align_size_down_(size, alignment);
573 return aligned_size > 0 ? aligned_size : alignment;
574 }
575
576 // Clamp an address to be within a specific page
577 // 1. If addr is on the page it is returned as is
578 // 2. If addr is above the page_address the start of the *next* page will be returned
579 // 3. Otherwise, if addr is below the page_address the start of the page will be returned
580 inline address clamp_address_in_page(address addr, address page_address, intptr_t page_size) {
581 if (align_size_down(intptr_t(addr), page_size) == align_size_down(intptr_t(page_address), page_size)) {
582 // address is in the specified page, just return it as is
583 return addr;
584 } else if (addr > page_address) {
585 // address is above specified page, return start of next page
586 return (address)align_size_down(intptr_t(page_address), page_size) + page_size;
587 } else {
588 // address is below specified page, return start of page
589 return (address)align_size_down(intptr_t(page_address), page_size);
590 }
591 }
592
593
594 // The expected size in bytes of a cache line, used to pad data structures.
595 #ifndef DEFAULT_CACHE_LINE_SIZE
596 #define DEFAULT_CACHE_LINE_SIZE 64
597 #endif
598
599
600 //----------------------------------------------------------------------------------------------------
601 // Utility macros for compilers
602 // used to silence compiler warnings
603
604 #define Unused_Variable(var) var
605
606
607 //----------------------------------------------------------------------------------------------------
608 // Miscellaneous
609
610 // 6302670 Eliminate Hotspot __fabsf dependency
611 // All fabs() callers should call this function instead, which will implicitly
612 // convert the operand to double, avoiding a dependency on __fabsf which
613 // doesn't exist in early versions of Solaris 8.
614 inline double fabsd(double value) {
615 return fabs(value);
616 }
617
618 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
619 // is zero, return 0.0.
620 template<typename T>
621 inline double percent_of(T numerator, T denominator) {
622 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
623 }
624
625 //----------------------------------------------------------------------------------------------------
626 // Special casts
627 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
628 typedef union {
629 jfloat f;
630 jint i;
631 } FloatIntConv;
632
633 typedef union {
634 jdouble d;
635 jlong l;
636 julong ul;
637 } DoubleLongConv;
638
639 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
640 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
641
642 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
643 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
644 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
645
646 inline jint low (jlong value) { return jint(value); }
647 inline jint high(jlong value) { return jint(value >> 32); }
648
649 // the fancy casts are a hopefully portable way
650 // to do unsigned 32 to 64 bit type conversion
651 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
652 *value |= (jlong)(julong)(juint)low; }
653
654 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
655 *value |= (jlong)high << 32; }
656
657 inline jlong jlong_from(jint h, jint l) {
658 jlong result = 0; // initialization to avoid warning
659 set_high(&result, h);
660 set_low(&result, l);
661 return result;
662 }
663
664 union jlong_accessor {
665 jint words[2];
666 jlong long_value;
667 };
668
669 void basic_types_init(); // cannot define here; uses assert
670
671
672 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
673 enum BasicType {
674 T_BOOLEAN = 4,
675 T_CHAR = 5,
676 T_FLOAT = 6,
677 T_DOUBLE = 7,
678 T_BYTE = 8,
679 T_SHORT = 9,
680 T_INT = 10,
681 T_LONG = 11,
682 T_OBJECT = 12,
683 T_ARRAY = 13,
684 T_VOID = 14,
685 T_ADDRESS = 15,
686 T_NARROWOOP = 16,
687 T_METADATA = 17,
688 T_NARROWKLASS = 18,
689 T_CONFLICT = 19, // for stack value type with conflicting contents
690 T_ILLEGAL = 99
691 };
692
693 inline bool is_java_primitive(BasicType t) {
694 return T_BOOLEAN <= t && t <= T_LONG;
695 }
696
697 inline bool is_subword_type(BasicType t) {
698 // these guys are processed exactly like T_INT in calling sequences:
699 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
700 }
701
702 inline bool is_signed_subword_type(BasicType t) {
703 return (t == T_BYTE || t == T_SHORT);
704 }
705
706 // Convert a char from a classfile signature to a BasicType
707 inline BasicType char2type(char c) {
708 switch( c ) {
709 case 'B': return T_BYTE;
710 case 'C': return T_CHAR;
711 case 'D': return T_DOUBLE;
712 case 'F': return T_FLOAT;
713 case 'I': return T_INT;
714 case 'J': return T_LONG;
715 case 'S': return T_SHORT;
716 case 'Z': return T_BOOLEAN;
717 case 'V': return T_VOID;
718 case 'L': return T_OBJECT;
719 case '[': return T_ARRAY;
720 }
721 return T_ILLEGAL;
722 }
723
724 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
725 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
726 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
727 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
728 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
729 extern BasicType name2type(const char* name);
730
731 // Auxiliary math routines
732 // least common multiple
733 extern size_t lcm(size_t a, size_t b);
734
735
736 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
737 enum BasicTypeSize {
738 T_BOOLEAN_size = 1,
739 T_CHAR_size = 1,
740 T_FLOAT_size = 1,
741 T_DOUBLE_size = 2,
742 T_BYTE_size = 1,
743 T_SHORT_size = 1,
744 T_INT_size = 1,
745 T_LONG_size = 2,
746 T_OBJECT_size = 1,
747 T_ARRAY_size = 1,
748 T_NARROWOOP_size = 1,
749 T_NARROWKLASS_size = 1,
750 T_VOID_size = 0
751 };
752
753
754 // maps a BasicType to its instance field storage type:
755 // all sub-word integral types are widened to T_INT
756 extern BasicType type2field[T_CONFLICT+1];
757 extern BasicType type2wfield[T_CONFLICT+1];
758
759
760 // size in bytes
761 enum ArrayElementSize {
762 T_BOOLEAN_aelem_bytes = 1,
763 T_CHAR_aelem_bytes = 2,
764 T_FLOAT_aelem_bytes = 4,
765 T_DOUBLE_aelem_bytes = 8,
766 T_BYTE_aelem_bytes = 1,
767 T_SHORT_aelem_bytes = 2,
768 T_INT_aelem_bytes = 4,
769 T_LONG_aelem_bytes = 8,
770 #ifdef _LP64
771 T_OBJECT_aelem_bytes = 8,
772 T_ARRAY_aelem_bytes = 8,
773 #else
774 T_OBJECT_aelem_bytes = 4,
775 T_ARRAY_aelem_bytes = 4,
776 #endif
777 T_NARROWOOP_aelem_bytes = 4,
778 T_NARROWKLASS_aelem_bytes = 4,
779 T_VOID_aelem_bytes = 0
780 };
781
782 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
783 #ifdef ASSERT
784 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
785 #else
786 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
787 #endif
788
789
790 // JavaValue serves as a container for arbitrary Java values.
791
792 class JavaValue {
793
794 public:
795 typedef union JavaCallValue {
796 jfloat f;
797 jdouble d;
798 jint i;
799 jlong l;
800 jobject h;
801 } JavaCallValue;
802
803 private:
804 BasicType _type;
805 JavaCallValue _value;
806
807 public:
808 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
809
810 JavaValue(jfloat value) {
811 _type = T_FLOAT;
812 _value.f = value;
813 }
814
815 JavaValue(jdouble value) {
816 _type = T_DOUBLE;
817 _value.d = value;
818 }
819
820 jfloat get_jfloat() const { return _value.f; }
821 jdouble get_jdouble() const { return _value.d; }
822 jint get_jint() const { return _value.i; }
823 jlong get_jlong() const { return _value.l; }
824 jobject get_jobject() const { return _value.h; }
825 JavaCallValue* get_value_addr() { return &_value; }
826 BasicType get_type() const { return _type; }
827
828 void set_jfloat(jfloat f) { _value.f = f;}
829 void set_jdouble(jdouble d) { _value.d = d;}
830 void set_jint(jint i) { _value.i = i;}
831 void set_jlong(jlong l) { _value.l = l;}
832 void set_jobject(jobject h) { _value.h = h;}
833 void set_type(BasicType t) { _type = t; }
834
835 jboolean get_jboolean() const { return (jboolean) (_value.i);}
836 jbyte get_jbyte() const { return (jbyte) (_value.i);}
837 jchar get_jchar() const { return (jchar) (_value.i);}
838 jshort get_jshort() const { return (jshort) (_value.i);}
839
840 };
841
842
843 #define STACK_BIAS 0
844 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
845 // in order to extend the reach of the stack pointer.
846 #if defined(SPARC) && defined(_LP64)
847 #undef STACK_BIAS
848 #define STACK_BIAS 0x7ff
849 #endif
850
851
852 // TosState describes the top-of-stack state before and after the execution of
853 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
854 // registers. The TosState corresponds to the 'machine representation' of this cached
855 // value. There's 4 states corresponding to the JAVA types int, long, float & double
856 // as well as a 5th state in case the top-of-stack value is actually on the top
857 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
858 // state when it comes to machine representation but is used separately for (oop)
859 // type specific operations (e.g. verification code).
860
861 enum TosState { // describes the tos cache contents
862 btos = 0, // byte, bool tos cached
863 ztos = 1, // byte, bool tos cached
864 ctos = 2, // char tos cached
865 stos = 3, // short tos cached
866 itos = 4, // int tos cached
867 ltos = 5, // long tos cached
868 ftos = 6, // float tos cached
869 dtos = 7, // double tos cached
870 atos = 8, // object cached
871 vtos = 9, // tos not cached
872 number_of_states,
873 ilgl // illegal state: should not occur
874 };
875
876
877 inline TosState as_TosState(BasicType type) {
878 switch (type) {
879 case T_BYTE : return btos;
880 case T_BOOLEAN: return ztos;
881 case T_CHAR : return ctos;
882 case T_SHORT : return stos;
883 case T_INT : return itos;
884 case T_LONG : return ltos;
885 case T_FLOAT : return ftos;
886 case T_DOUBLE : return dtos;
887 case T_VOID : return vtos;
888 case T_ARRAY : // fall through
889 case T_OBJECT : return atos;
890 }
891 return ilgl;
892 }
893
894 inline BasicType as_BasicType(TosState state) {
895 switch (state) {
896 case btos : return T_BYTE;
897 case ztos : return T_BOOLEAN;
898 case ctos : return T_CHAR;
899 case stos : return T_SHORT;
900 case itos : return T_INT;
901 case ltos : return T_LONG;
902 case ftos : return T_FLOAT;
903 case dtos : return T_DOUBLE;
904 case atos : return T_OBJECT;
905 case vtos : return T_VOID;
906 }
907 return T_ILLEGAL;
908 }
909
910
911 // Helper function to convert BasicType info into TosState
912 // Note: Cannot define here as it uses global constant at the time being.
913 TosState as_TosState(BasicType type);
914
915
916 // JavaThreadState keeps track of which part of the code a thread is executing in. This
917 // information is needed by the safepoint code.
918 //
919 // There are 4 essential states:
920 //
921 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
922 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
923 // _thread_in_vm : Executing in the vm
924 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
925 //
926 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
927 // a transition from one state to another. These extra states makes it possible for the safepoint code to
928 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
929 //
930 // Given a state, the xxxx_trans state can always be found by adding 1.
931 //
932 enum JavaThreadState {
933 _thread_uninitialized = 0, // should never happen (missing initialization)
934 _thread_new = 2, // just starting up, i.e., in process of being initialized
935 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
936 _thread_in_native = 4, // running in native code
937 _thread_in_native_trans = 5, // corresponding transition state
938 _thread_in_vm = 6, // running in VM
939 _thread_in_vm_trans = 7, // corresponding transition state
940 _thread_in_Java = 8, // running in Java or in stub code
941 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
942 _thread_blocked = 10, // blocked in vm
943 _thread_blocked_trans = 11, // corresponding transition state
944 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
945 };
946
947
948
949 //----------------------------------------------------------------------------------------------------
950 // 'Forward' declarations of frequently used classes
951 // (in order to reduce interface dependencies & reduce
952 // number of unnecessary compilations after changes)
953
954 class ClassFileStream;
955
956 class Event;
957
958 class Thread;
959 class VMThread;
960 class JavaThread;
961 class Threads;
962
963 class VM_Operation;
964 class VMOperationQueue;
965
966 class CodeBlob;
967 class CompiledMethod;
968 class nmethod;
969 class RuntimeBlob;
970 class OSRAdapter;
971 class I2CAdapter;
972 class C2IAdapter;
973 class CompiledIC;
974 class relocInfo;
975 class ScopeDesc;
976 class PcDesc;
977
978 class Recompiler;
979 class Recompilee;
980 class RecompilationPolicy;
981 class RFrame;
982 class CompiledRFrame;
983 class InterpretedRFrame;
984
985 class vframe;
986 class javaVFrame;
987 class interpretedVFrame;
988 class compiledVFrame;
989 class deoptimizedVFrame;
990 class externalVFrame;
991 class entryVFrame;
992
993 class RegisterMap;
994
995 class Mutex;
996 class Monitor;
997 class BasicLock;
998 class BasicObjectLock;
999
1000 class PeriodicTask;
1001
1002 class JavaCallWrapper;
1003
1004 class oopDesc;
1005 class metaDataOopDesc;
1006
1007 class NativeCall;
1008
1009 class zone;
1010
1011 class StubQueue;
1012
1013 class outputStream;
1014
1015 class ResourceArea;
1016
1017 class DebugInformationRecorder;
1018 class ScopeValue;
1019 class CompressedStream;
1020 class DebugInfoReadStream;
1021 class DebugInfoWriteStream;
1022 class LocationValue;
1023 class ConstantValue;
1024 class IllegalValue;
1025
1026 class PrivilegedElement;
1027 class MonitorArray;
1028
1029 class MonitorInfo;
1030
1031 class OffsetClosure;
1032 class OopMapCache;
1033 class InterpreterOopMap;
1034 class OopMapCacheEntry;
1035 class OSThread;
1036
1037 typedef int (*OSThreadStartFunc)(void*);
1038
1039 class Space;
1040
1041 class JavaValue;
1042 class methodHandle;
1043 class JavaCallArguments;
1044
1045 // Basic support for errors.
1046 extern void basic_fatal(const char* msg);
1047
1048 //----------------------------------------------------------------------------------------------------
1049 // Special constants for debugging
1050
1051 const jint badInt = -3; // generic "bad int" value
1052 const long badAddressVal = -2; // generic "bad address" value
1053 const long badOopVal = -1; // generic "bad oop" value
1054 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
1055 const int badHandleValue = 0xBC; // value used to zap vm handle area
1056 const int badResourceValue = 0xAB; // value used to zap resource area
1057 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
1058 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
1059 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
1060 const intptr_t badJNIHandleVal = (intptr_t) UCONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area
1061 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
1062 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
1063 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
1064 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
1065
1066
1067 // (These must be implemented as #defines because C++ compilers are
1068 // not obligated to inline non-integral constants!)
1069 #define badAddress ((address)::badAddressVal)
1070 #define badOop (cast_to_oop(::badOopVal))
1071 #define badHeapWord (::badHeapWordVal)
1072 #define badJNIHandle (cast_to_oop(::badJNIHandleVal))
1073
1074 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
1075 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
1076
1077 //----------------------------------------------------------------------------------------------------
1078 // Utility functions for bitfield manipulations
1079
1080 const intptr_t AllBits = ~0; // all bits set in a word
1081 const intptr_t NoBits = 0; // no bits set in a word
1082 const jlong NoLongBits = 0; // no bits set in a long
1083 const intptr_t OneBit = 1; // only right_most bit set in a word
1084
1085 // get a word with the n.th or the right-most or left-most n bits set
1086 // (note: #define used only so that they can be used in enum constant definitions)
1087 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
1088 #define right_n_bits(n) (nth_bit(n) - 1)
1089 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
1090
1091 // bit-operations using a mask m
1092 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
1093 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
1094 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
1095 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
1096 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
1097
1098 // bit-operations using the n.th bit
1099 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
1100 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
1101 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1102
1103 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1104 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1105 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1106 }
1107
1108
1109 //----------------------------------------------------------------------------------------------------
1110 // Utility functions for integers
1111
1112 // Avoid use of global min/max macros which may cause unwanted double
1113 // evaluation of arguments.
1114 #ifdef max
1115 #undef max
1116 #endif
1117
1118 #ifdef min
1119 #undef min
1120 #endif
1121
1122 // The following defines serve the purpose of preventing use of accidentally
1123 // included min max macros from compiling, while continuing to allow innocent
1124 // min and max identifiers in the code to compile as intended.
1125 #define max max
1126 #define min min
1127
1128 // It is necessary to use templates here. Having normal overloaded
1129 // functions does not work because it is necessary to provide both 32-
1130 // and 64-bit overloaded functions, which does not work, and having
1131 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1132 // will be even more error-prone than macros.
1133 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1134 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1135 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1136 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1137 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1138 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1139
1140 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1141
1142 // true if x is a power of 2, false otherwise
1143 inline bool is_power_of_2(intptr_t x) {
1144 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1145 }
1146
1147 // long version of is_power_of_2
1148 inline bool is_power_of_2_long(jlong x) {
1149 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1150 }
1151
1152 // Returns largest i such that 2^i <= x.
1153 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1154 // If x == 0, the function returns -1.
1155 inline int log2_intptr(intptr_t x) {
1156 int i = -1;
1157 uintptr_t p = 1;
1158 while (p != 0 && p <= (uintptr_t)x) {
1159 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1160 i++; p *= 2;
1161 }
1162 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1163 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1164 return i;
1165 }
1166
1167 //* largest i such that 2^i <= x
1168 // A negative value of 'x' will return '63'
1169 inline int log2_long(jlong x) {
1170 int i = -1;
1171 julong p = 1;
1172 while (p != 0 && p <= (julong)x) {
1173 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1174 i++; p *= 2;
1175 }
1176 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1177 // (if p = 0 then overflow occurred and i = 63)
1178 return i;
1179 }
1180
1181 //* the argument must be exactly a power of 2
1182 inline int exact_log2(intptr_t x) {
1183 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1184 return log2_intptr(x);
1185 }
1186
1187 //* the argument must be exactly a power of 2
1188 inline int exact_log2_long(jlong x) {
1189 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1190 return log2_long(x);
1191 }
1192
1193
1194 // returns integer round-up to the nearest multiple of s (s must be a power of two)
1195 inline intptr_t round_to(intptr_t x, uintx s) {
1196 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s);
1197 const uintx m = s - 1;
1198 return mask_bits(x + m, ~m);
1199 }
1200
1201 // returns integer round-down to the nearest multiple of s (s must be a power of two)
1202 inline intptr_t round_down(intptr_t x, uintx s) {
1203 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s);
1204 const uintx m = s - 1;
1205 return mask_bits(x, ~m);
1206 }
1207
1208
1209 inline bool is_odd (intx x) { return x & 1; }
1210 inline bool is_even(intx x) { return !is_odd(x); }
1211
1212 // "to" should be greater than "from."
1213 inline intx byte_size(void* from, void* to) {
1214 return (address)to - (address)from;
1215 }
1216
1217 //----------------------------------------------------------------------------------------------------
1218 // Avoid non-portable casts with these routines (DEPRECATED)
1219
1220 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1221 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1222
1223 // Given sequence of four bytes, build into a 32-bit word
1224 // following the conventions used in class files.
1225 // On the 386, this could be realized with a simple address cast.
1226 //
1227
1228 // This routine takes eight bytes:
1229 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1230 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1231 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1232 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1233 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1234 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1235 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1236 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1237 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1238 }
1239
1240 // This routine takes four bytes:
1241 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1242 return (( u4(c1) << 24 ) & 0xff000000)
1243 | (( u4(c2) << 16 ) & 0x00ff0000)
1244 | (( u4(c3) << 8 ) & 0x0000ff00)
1245 | (( u4(c4) << 0 ) & 0x000000ff);
1246 }
1247
1248 // And this one works if the four bytes are contiguous in memory:
1249 inline u4 build_u4_from( u1* p ) {
1250 return build_u4_from( p[0], p[1], p[2], p[3] );
1251 }
1252
1253 // Ditto for two-byte ints:
1254 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1255 return u2((( u2(c1) << 8 ) & 0xff00)
1256 | (( u2(c2) << 0 ) & 0x00ff));
1257 }
1258
1259 // And this one works if the two bytes are contiguous in memory:
1260 inline u2 build_u2_from( u1* p ) {
1261 return build_u2_from( p[0], p[1] );
1262 }
1263
1264 // Ditto for floats:
1265 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1266 u4 u = build_u4_from( c1, c2, c3, c4 );
1267 return *(jfloat*)&u;
1268 }
1269
1270 inline jfloat build_float_from( u1* p ) {
1271 u4 u = build_u4_from( p );
1272 return *(jfloat*)&u;
1273 }
1274
1275
1276 // now (64-bit) longs
1277
1278 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1279 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1280 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1281 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1282 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1283 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1284 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1285 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1286 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1287 }
1288
1289 inline jlong build_long_from( u1* p ) {
1290 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1291 }
1292
1293
1294 // Doubles, too!
1295 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1296 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1297 return *(jdouble*)&u;
1298 }
1299
1300 inline jdouble build_double_from( u1* p ) {
1301 jlong u = build_long_from( p );
1302 return *(jdouble*)&u;
1303 }
1304
1305
1306 // Portable routines to go the other way:
1307
1308 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1309 c1 = u1(x >> 8);
1310 c2 = u1(x);
1311 }
1312
1313 inline void explode_short_to( u2 x, u1* p ) {
1314 explode_short_to( x, p[0], p[1]);
1315 }
1316
1317 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1318 c1 = u1(x >> 24);
1319 c2 = u1(x >> 16);
1320 c3 = u1(x >> 8);
1321 c4 = u1(x);
1322 }
1323
1324 inline void explode_int_to( u4 x, u1* p ) {
1325 explode_int_to( x, p[0], p[1], p[2], p[3]);
1326 }
1327
1328
1329 // Pack and extract shorts to/from ints:
1330
1331 inline int extract_low_short_from_int(jint x) {
1332 return x & 0xffff;
1333 }
1334
1335 inline int extract_high_short_from_int(jint x) {
1336 return (x >> 16) & 0xffff;
1337 }
1338
1339 inline int build_int_from_shorts( jushort low, jushort high ) {
1340 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1341 }
1342
1343 // Convert pointer to intptr_t, for use in printing pointers.
1344 inline intptr_t p2i(const void * p) {
1345 return (intptr_t) p;
1346 }
1347
1348 // swap a & b
1349 template<class T> static void swap(T& a, T& b) {
1350 T tmp = a;
1351 a = b;
1352 b = tmp;
1353 }
1354
1355 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1356
1357 //----------------------------------------------------------------------------------------------------
1358 // Sum and product which can never overflow: they wrap, just like the
1359 // Java operations. Note that we don't intend these to be used for
1360 // general-purpose arithmetic: their purpose is to emulate Java
1361 // operations.
1362
1363 // The goal of this code to avoid undefined or implementation-defined
1364 // behavior. The use of an lvalue to reference cast is explicitly
1365 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1366 // 15 in C++03]
1367 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1368 inline TYPE NAME (TYPE in1, TYPE in2) { \
1369 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1370 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1371 return reinterpret_cast<TYPE&>(ures); \
1372 }
1373
1374 JAVA_INTEGER_OP(+, java_add, jint, juint)
1375 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1376 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1377 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1378 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1379 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1380
1381 #undef JAVA_INTEGER_OP
1382
1383 // Dereference vptr
1384 // All C++ compilers that we know of have the vtbl pointer in the first
1385 // word. If there are exceptions, this function needs to be made compiler
1386 // specific.
1387 static inline void* dereference_vptr(const void* addr) {
1388 return *(void**)addr;
1389 }
1390
1391 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP