1 /*
2 * Copyright (c) 1997, 2016, 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/macros.hpp"
29 #include "utilities/compilerWarnings.hpp"
30 #include "utilities/debug.hpp"
31
32 #include TARGET_COMPILER_HEADER(utilities/globalDefinitions)
33 // Defaults for macros that might be defined per compiler.
34 #ifndef NOINLINE
35 #define NOINLINE
36 #endif
37 #ifndef ALWAYSINLINE
38 #define ALWAYSINLINE inline
39 #endif
40
41 // This file holds all globally used constants & types, class (forward)
42 // declarations and a few frequently used utility functions.
43
44 //----------------------------------------------------------------------------------------------------
45 // Printf-style formatters for fixed- and variable-width types as pointers and
46 // integers. These are derived from the definitions in inttypes.h. If the platform
47 // doesn't provide appropriate definitions, they should be provided in
48 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
49
50 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
51
52 // Format 32-bit quantities.
53 #define INT32_FORMAT "%" PRId32
54 #define UINT32_FORMAT "%" PRIu32
55 #define INT32_FORMAT_W(width) "%" #width PRId32
56 #define UINT32_FORMAT_W(width) "%" #width PRIu32
57
58 #define PTR32_FORMAT "0x%08" PRIx32
59 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
60
61 // Format 64-bit quantities.
62 #define INT64_FORMAT "%" PRId64
63 #define UINT64_FORMAT "%" PRIu64
64 #define UINT64_FORMAT_X "%" PRIx64
65 #define INT64_FORMAT_W(width) "%" #width PRId64
66 #define UINT64_FORMAT_W(width) "%" #width PRIu64
67
68 #define PTR64_FORMAT "0x%016" PRIx64
69
70 // Format jlong, if necessary
71 #ifndef JLONG_FORMAT
72 #define JLONG_FORMAT INT64_FORMAT
73 #endif
74 #ifndef JULONG_FORMAT
75 #define JULONG_FORMAT UINT64_FORMAT
76 #endif
77 #ifndef JULONG_FORMAT_X
78 #define JULONG_FORMAT_X UINT64_FORMAT_X
79 #endif
80
81 // Format pointers which change size between 32- and 64-bit.
82 #ifdef _LP64
83 #define INTPTR_FORMAT "0x%016" PRIxPTR
84 #define PTR_FORMAT "0x%016" PRIxPTR
85 #else // !_LP64
86 #define INTPTR_FORMAT "0x%08" PRIxPTR
87 #define PTR_FORMAT "0x%08" PRIxPTR
88 #endif // _LP64
89
90 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
91
92 #define SSIZE_FORMAT "%" PRIdPTR
93 #define SIZE_FORMAT "%" PRIuPTR
94 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
95 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
96 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
97 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
98
99 #define INTX_FORMAT "%" PRIdPTR
100 #define UINTX_FORMAT "%" PRIuPTR
101 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
102 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
103
104 //----------------------------------------------------------------------------------------------------
105 // Constants
106
107 const int LogBytesPerShort = 1;
108 const int LogBytesPerInt = 2;
109 #ifdef _LP64
110 const int LogBytesPerWord = 3;
111 #else
112 const int LogBytesPerWord = 2;
113 #endif
114 const int LogBytesPerLong = 3;
115
116 const int BytesPerShort = 1 << LogBytesPerShort;
117 const int BytesPerInt = 1 << LogBytesPerInt;
118 const int BytesPerWord = 1 << LogBytesPerWord;
119 const int BytesPerLong = 1 << LogBytesPerLong;
120
121 const int LogBitsPerByte = 3;
122 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
123 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
124 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
125 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
126
127 const int BitsPerByte = 1 << LogBitsPerByte;
128 const int BitsPerShort = 1 << LogBitsPerShort;
129 const int BitsPerInt = 1 << LogBitsPerInt;
130 const int BitsPerWord = 1 << LogBitsPerWord;
131 const int BitsPerLong = 1 << LogBitsPerLong;
132
133 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
134 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
135
136 const int WordsPerLong = 2; // Number of stack entries for longs
137
138 const int oopSize = sizeof(char*); // Full-width oop
139 extern int heapOopSize; // Oop within a java object
140 const int wordSize = sizeof(char*);
141 const int longSize = sizeof(jlong);
142 const int jintSize = sizeof(jint);
143 const int size_tSize = sizeof(size_t);
144
145 const int BytesPerOop = BytesPerWord; // Full-width oop
146
147 extern int LogBytesPerHeapOop; // Oop within a java object
148 extern int LogBitsPerHeapOop;
149 extern int BytesPerHeapOop;
150 extern int BitsPerHeapOop;
151
152 const int BitsPerJavaInteger = 32;
153 const int BitsPerJavaLong = 64;
154 const int BitsPerSize_t = size_tSize * BitsPerByte;
155
156 // Size of a char[] needed to represent a jint as a string in decimal.
157 const int jintAsStringSize = 12;
158
159 // In fact this should be
160 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
161 // see os::set_memory_serialize_page()
162 #ifdef _LP64
163 const int SerializePageShiftCount = 4;
164 #else
165 const int SerializePageShiftCount = 3;
166 #endif
167
168 // An opaque struct of heap-word width, so that HeapWord* can be a generic
169 // pointer into the heap. We require that object sizes be measured in
170 // units of heap words, so that that
171 // HeapWord* hw;
172 // hw += oop(hw)->foo();
173 // works, where foo is a method (like size or scavenge) that returns the
174 // object size.
175 class HeapWord {
176 friend class VMStructs;
177 private:
178 char* i;
179 #ifndef PRODUCT
180 public:
181 char* value() { return i; }
182 #endif
183 };
184
185 // Analogous opaque struct for metadata allocated from
186 // metaspaces.
187 class MetaWord {
188 private:
189 char* i;
190 };
191
192 // HeapWordSize must be 2^LogHeapWordSize.
193 const int HeapWordSize = sizeof(HeapWord);
194 #ifdef _LP64
195 const int LogHeapWordSize = 3;
196 #else
197 const int LogHeapWordSize = 2;
198 #endif
199 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
200 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
201
202 // The larger HeapWordSize for 64bit requires larger heaps
203 // for the same application running in 64bit. See bug 4967770.
204 // The minimum alignment to a heap word size is done. Other
205 // parts of the memory system may require additional alignment
206 // and are responsible for those alignments.
207 #ifdef _LP64
208 #define ScaleForWordSize(x) align_size_down_((x) * 13 / 10, HeapWordSize)
209 #else
210 #define ScaleForWordSize(x) (x)
211 #endif
212
213 // The minimum number of native machine words necessary to contain "byte_size"
214 // bytes.
215 inline size_t heap_word_size(size_t byte_size) {
216 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
217 }
218
219 //-------------------------------------------
220 // Constant for jlong (standardized by C++11)
221
222 // Build a 64bit integer constant
223 #define CONST64(x) (x ## LL)
224 #define UCONST64(x) (x ## ULL)
225
226 const jlong min_jlong = CONST64(0x8000000000000000);
227 const jlong max_jlong = CONST64(0x7fffffffffffffff);
228
229 const size_t K = 1024;
230 const size_t M = K*K;
231 const size_t G = M*K;
232 const size_t HWperKB = K / sizeof(HeapWord);
233
234 // Constants for converting from a base unit to milli-base units. For
235 // example from seconds to milliseconds and microseconds
236
237 const int MILLIUNITS = 1000; // milli units per base unit
238 const int MICROUNITS = 1000000; // micro units per base unit
239 const int NANOUNITS = 1000000000; // nano units per base unit
240
241 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
242 const jint NANOSECS_PER_MILLISEC = 1000000;
243
244 inline const char* proper_unit_for_byte_size(size_t s) {
245 #ifdef _LP64
246 if (s >= 10*G) {
247 return "G";
248 }
249 #endif
250 if (s >= 10*M) {
251 return "M";
252 } else if (s >= 10*K) {
253 return "K";
254 } else {
255 return "B";
256 }
257 }
258
259 template <class T>
260 inline T byte_size_in_proper_unit(T s) {
261 #ifdef _LP64
262 if (s >= 10*G) {
263 return (T)(s/G);
264 }
265 #endif
266 if (s >= 10*M) {
267 return (T)(s/M);
268 } else if (s >= 10*K) {
269 return (T)(s/K);
270 } else {
271 return s;
272 }
273 }
274
275 inline const char* exact_unit_for_byte_size(size_t s) {
276 #ifdef _LP64
277 if (s >= G && (s % G) == 0) {
278 return "G";
279 }
280 #endif
281 if (s >= M && (s % M) == 0) {
282 return "M";
283 }
284 if (s >= K && (s % K) == 0) {
285 return "K";
286 }
287 return "B";
288 }
289
290 inline size_t byte_size_in_exact_unit(size_t s) {
291 #ifdef _LP64
292 if (s >= G && (s % G) == 0) {
293 return s / G;
294 }
295 #endif
296 if (s >= M && (s % M) == 0) {
297 return s / M;
298 }
299 if (s >= K && (s % K) == 0) {
300 return s / K;
301 }
302 return s;
303 }
304
305 //----------------------------------------------------------------------------------------------------
306 // VM type definitions
307
308 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
309 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
310
311 typedef intptr_t intx;
312 typedef uintptr_t uintx;
313
314 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
315 const intx max_intx = (uintx)min_intx - 1;
316 const uintx max_uintx = (uintx)-1;
317
318 // Table of values:
319 // sizeof intx 4 8
320 // min_intx 0x80000000 0x8000000000000000
321 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
322 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
323
324 typedef unsigned int uint; NEEDS_CLEANUP
325
326
327 //----------------------------------------------------------------------------------------------------
328 // Java type definitions
329
330 // All kinds of 'plain' byte addresses
331 typedef signed char s_char;
332 typedef unsigned char u_char;
333 typedef u_char* address;
334 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
335 // except for some implementations of a C++
336 // linkage pointer to function. Should never
337 // need one of those to be placed in this
338 // type anyway.
339
340 // Utility functions to "portably" (?) bit twiddle pointers
341 // Where portable means keep ANSI C++ compilers quiet
342
343 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
344 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
345
346 // Utility functions to "portably" make cast to/from function pointers.
347
348 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
349 inline address_word castable_address(address x) { return address_word(x) ; }
350 inline address_word castable_address(void* x) { return address_word(x) ; }
351
352 // Pointer subtraction.
353 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
354 // the range we might need to find differences from one end of the heap
355 // to the other.
356 // A typical use might be:
357 // if (pointer_delta(end(), top()) >= size) {
358 // // enough room for an object of size
359 // ...
360 // and then additions like
361 // ... top() + size ...
362 // are safe because we know that top() is at least size below end().
363 inline size_t pointer_delta(const volatile void* left,
364 const volatile void* right,
365 size_t element_size) {
366 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
367 }
368
369 // A version specialized for HeapWord*'s.
370 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
371 return pointer_delta(left, right, sizeof(HeapWord));
372 }
373 // A version specialized for MetaWord*'s.
374 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
375 return pointer_delta(left, right, sizeof(MetaWord));
376 }
377
378 //
379 // ANSI C++ does not allow casting from one pointer type to a function pointer
380 // directly without at best a warning. This macro accomplishes it silently
381 // In every case that is present at this point the value be cast is a pointer
382 // to a C linkage function. In some case the type used for the cast reflects
383 // that linkage and a picky compiler would not complain. In other cases because
384 // there is no convenient place to place a typedef with extern C linkage (i.e
385 // a platform dependent header file) it doesn't. At this point no compiler seems
386 // picky enough to catch these instances (which are few). It is possible that
387 // using templates could fix these for all cases. This use of templates is likely
388 // so far from the middle of the road that it is likely to be problematic in
389 // many C++ compilers.
390 //
391 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
392 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
393
394 // Unsigned byte types for os and stream.hpp
395
396 // Unsigned one, two, four and eigth byte quantities used for describing
397 // the .class file format. See JVM book chapter 4.
398
399 typedef jubyte u1;
400 typedef jushort u2;
401 typedef juint u4;
402 typedef julong u8;
403
404 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
405 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
406 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
407 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
408
409 typedef jbyte s1;
410 typedef jshort s2;
411 typedef jint s4;
412 typedef jlong s8;
413
414 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
415 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
416 const jshort min_jshort = -(1 << 15); // smallest jshort
417 const jshort max_jshort = (1 << 15) - 1; // largest jshort
418
419 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
420 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
421
422 //----------------------------------------------------------------------------------------------------
423 // JVM spec restrictions
424
425 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
426
427 // Default ProtectionDomainCacheSize values
428
429 const int defaultProtectionDomainCacheSize = NOT_LP64(137) LP64_ONLY(2017);
430
431 //----------------------------------------------------------------------------------------------------
432 // Default and minimum StringTableSize values
433
434 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013);
435 const int minimumStringTableSize = 1009;
436
437 const int defaultSymbolTableSize = 20011;
438 const int minimumSymbolTableSize = 1009;
439
440
441 //----------------------------------------------------------------------------------------------------
442 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
443 //
444 // Determines whether on-the-fly class replacement and frame popping are enabled.
445
446 #define HOTSWAP
447
448 //----------------------------------------------------------------------------------------------------
449 // Object alignment, in units of HeapWords.
450 //
451 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
452 // reference fields can be naturally aligned.
453
454 extern int MinObjAlignment;
455 extern int MinObjAlignmentInBytes;
456 extern int MinObjAlignmentInBytesMask;
457
458 extern int LogMinObjAlignment;
459 extern int LogMinObjAlignmentInBytes;
460
461 const int LogKlassAlignmentInBytes = 3;
462 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
463 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
464 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
465
466 // Maximal size of heap where unscaled compression can be used. Also upper bound
467 // for heap placement: 4GB.
468 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
469 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
470 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
471 extern uint64_t OopEncodingHeapMax;
472
473 // Maximal size of compressed class space. Above this limit compression is not possible.
474 // Also upper bound for placement of zero based class space. (Class space is further limited
475 // to be < 3G, see arguments.cpp.)
476 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
477
478 // Machine dependent stuff
479
480 // The maximum size of the code cache. Can be overridden by targets.
481 #define CODE_CACHE_SIZE_LIMIT (2*G)
482 // Allow targets to reduce the default size of the code cache.
483 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
484
485 #include CPU_HEADER(globalDefinitions)
486
487 // To assure the IRIW property on processors that are not multiple copy
488 // atomic, sync instructions must be issued between volatile reads to
489 // assure their ordering, instead of after volatile stores.
490 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
491 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
492 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
493 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
494 #else
495 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
496 #endif
497
498 // The byte alignment to be used by Arena::Amalloc. See bugid 4169348.
499 // Note: this value must be a power of 2
500
501 #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
502
503 // Signed variants of alignment helpers. There are two versions of each, a macro
504 // for use in places like enum definitions that require compile-time constant
505 // expressions and a function for all other places so as to get type checking.
506
507 #define align_size_up_(size, alignment) (((size) + ((alignment) - 1)) & ~((alignment) - 1))
508
509 inline bool is_size_aligned(size_t size, size_t alignment) {
510 return align_size_up_(size, alignment) == size;
511 }
512
513 inline bool is_ptr_aligned(const void* ptr, size_t alignment) {
514 return align_size_up_((intptr_t)ptr, (intptr_t)alignment) == (intptr_t)ptr;
515 }
516
517 inline intptr_t align_size_up(intptr_t size, intptr_t alignment) {
518 return align_size_up_(size, alignment);
519 }
520
521 #define align_size_down_(size, alignment) ((size) & ~((alignment) - 1))
522
523 inline intptr_t align_size_down(intptr_t size, intptr_t alignment) {
524 return align_size_down_(size, alignment);
525 }
526
527 #define is_size_aligned_(size, alignment) ((size) == (align_size_up_(size, alignment)))
528
529 inline void* align_ptr_up(const void* ptr, size_t alignment) {
530 return (void*)align_size_up((intptr_t)ptr, (intptr_t)alignment);
531 }
532
533 inline void* align_ptr_down(void* ptr, size_t alignment) {
534 return (void*)align_size_down((intptr_t)ptr, (intptr_t)alignment);
535 }
536
537 inline volatile void* align_ptr_down(volatile void* ptr, size_t alignment) {
538 return (volatile void*)align_size_down((intptr_t)ptr, (intptr_t)alignment);
539 }
540
541 // Align metaspace objects by rounding up to natural word boundary
542
543 inline intptr_t align_metadata_size(intptr_t size) {
544 return align_size_up(size, 1);
545 }
546
547 // Align objects in the Java Heap by rounding up their size, in HeapWord units.
548 // Since the size is given in words this is somewhat of a nop, but
549 // distinguishes it from align_object_size.
550 inline intptr_t align_object_size(intptr_t size) {
551 return align_size_up(size, MinObjAlignment);
552 }
553
554 inline bool is_object_aligned(intptr_t addr) {
555 return addr == align_object_size(addr);
556 }
557
558 // Pad out certain offsets to jlong alignment, in HeapWord units.
559
560 inline intptr_t align_object_offset(intptr_t offset) {
561 return align_size_up(offset, HeapWordsPerLong);
562 }
563
564 // Align down with a lower bound. If the aligning results in 0, return 'alignment'.
565
566 inline size_t align_size_down_bounded(size_t size, size_t alignment) {
567 size_t aligned_size = align_size_down_(size, alignment);
568 return aligned_size > 0 ? aligned_size : alignment;
569 }
570
571 // Clamp an address to be within a specific page
572 // 1. If addr is on the page it is returned as is
573 // 2. If addr is above the page_address the start of the *next* page will be returned
574 // 3. Otherwise, if addr is below the page_address the start of the page will be returned
575 inline address clamp_address_in_page(address addr, address page_address, intptr_t page_size) {
576 if (align_size_down(intptr_t(addr), page_size) == align_size_down(intptr_t(page_address), page_size)) {
577 // address is in the specified page, just return it as is
578 return addr;
579 } else if (addr > page_address) {
580 // address is above specified page, return start of next page
581 return (address)align_size_down(intptr_t(page_address), page_size) + page_size;
582 } else {
583 // address is below specified page, return start of page
584 return (address)align_size_down(intptr_t(page_address), page_size);
585 }
586 }
587
588
589 // The expected size in bytes of a cache line, used to pad data structures.
590 #ifndef DEFAULT_CACHE_LINE_SIZE
591 #define DEFAULT_CACHE_LINE_SIZE 64
592 #endif
593
594
595 //----------------------------------------------------------------------------------------------------
596 // Utility macros for compilers
597 // used to silence compiler warnings
598
599 #define Unused_Variable(var) var
600
601
602 //----------------------------------------------------------------------------------------------------
603 // Miscellaneous
604
605 // 6302670 Eliminate Hotspot __fabsf dependency
606 // All fabs() callers should call this function instead, which will implicitly
607 // convert the operand to double, avoiding a dependency on __fabsf which
608 // doesn't exist in early versions of Solaris 8.
609 inline double fabsd(double value) {
610 return fabs(value);
611 }
612
613 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
614 // is zero, return 0.0.
615 template<typename T>
616 inline double percent_of(T numerator, T denominator) {
617 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
618 }
619
620 //----------------------------------------------------------------------------------------------------
621 // Special casts
622 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
623 typedef union {
624 jfloat f;
625 jint i;
626 } FloatIntConv;
627
628 typedef union {
629 jdouble d;
630 jlong l;
631 julong ul;
632 } DoubleLongConv;
633
634 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
635 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
636
637 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
638 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
639 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
640
641 inline jint low (jlong value) { return jint(value); }
642 inline jint high(jlong value) { return jint(value >> 32); }
643
644 // the fancy casts are a hopefully portable way
645 // to do unsigned 32 to 64 bit type conversion
646 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
647 *value |= (jlong)(julong)(juint)low; }
648
649 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
650 *value |= (jlong)high << 32; }
651
652 inline jlong jlong_from(jint h, jint l) {
653 jlong result = 0; // initialization to avoid warning
654 set_high(&result, h);
655 set_low(&result, l);
656 return result;
657 }
658
659 union jlong_accessor {
660 jint words[2];
661 jlong long_value;
662 };
663
664 void basic_types_init(); // cannot define here; uses assert
665
666
667 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
668 enum BasicType {
669 T_BOOLEAN = 4,
670 T_CHAR = 5,
671 T_FLOAT = 6,
672 T_DOUBLE = 7,
673 T_BYTE = 8,
674 T_SHORT = 9,
675 T_INT = 10,
676 T_LONG = 11,
677 T_OBJECT = 12,
678 T_ARRAY = 13,
679 T_VOID = 14,
680 T_ADDRESS = 15,
681 T_NARROWOOP = 16,
682 T_METADATA = 17,
683 T_NARROWKLASS = 18,
684 T_CONFLICT = 19, // for stack value type with conflicting contents
685 T_ILLEGAL = 99
686 };
687
688 inline bool is_java_primitive(BasicType t) {
689 return T_BOOLEAN <= t && t <= T_LONG;
690 }
691
692 inline bool is_subword_type(BasicType t) {
693 // these guys are processed exactly like T_INT in calling sequences:
694 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
695 }
696
697 inline bool is_signed_subword_type(BasicType t) {
698 return (t == T_BYTE || t == T_SHORT);
699 }
700
701 // Convert a char from a classfile signature to a BasicType
702 inline BasicType char2type(char c) {
703 switch( c ) {
704 case 'B': return T_BYTE;
705 case 'C': return T_CHAR;
706 case 'D': return T_DOUBLE;
707 case 'F': return T_FLOAT;
708 case 'I': return T_INT;
709 case 'J': return T_LONG;
710 case 'S': return T_SHORT;
711 case 'Z': return T_BOOLEAN;
712 case 'V': return T_VOID;
713 case 'L': return T_OBJECT;
714 case '[': return T_ARRAY;
715 }
716 return T_ILLEGAL;
717 }
718
719 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
720 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
721 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
722 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
723 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
724 extern BasicType name2type(const char* name);
725
726 // Auxiliary math routines
727 // least common multiple
728 extern size_t lcm(size_t a, size_t b);
729
730
731 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
732 enum BasicTypeSize {
733 T_BOOLEAN_size = 1,
734 T_CHAR_size = 1,
735 T_FLOAT_size = 1,
736 T_DOUBLE_size = 2,
737 T_BYTE_size = 1,
738 T_SHORT_size = 1,
739 T_INT_size = 1,
740 T_LONG_size = 2,
741 T_OBJECT_size = 1,
742 T_ARRAY_size = 1,
743 T_NARROWOOP_size = 1,
744 T_NARROWKLASS_size = 1,
745 T_VOID_size = 0
746 };
747
748
749 // maps a BasicType to its instance field storage type:
750 // all sub-word integral types are widened to T_INT
751 extern BasicType type2field[T_CONFLICT+1];
752 extern BasicType type2wfield[T_CONFLICT+1];
753
754
755 // size in bytes
756 enum ArrayElementSize {
757 T_BOOLEAN_aelem_bytes = 1,
758 T_CHAR_aelem_bytes = 2,
759 T_FLOAT_aelem_bytes = 4,
760 T_DOUBLE_aelem_bytes = 8,
761 T_BYTE_aelem_bytes = 1,
762 T_SHORT_aelem_bytes = 2,
763 T_INT_aelem_bytes = 4,
764 T_LONG_aelem_bytes = 8,
765 #ifdef _LP64
766 T_OBJECT_aelem_bytes = 8,
767 T_ARRAY_aelem_bytes = 8,
768 #else
769 T_OBJECT_aelem_bytes = 4,
770 T_ARRAY_aelem_bytes = 4,
771 #endif
772 T_NARROWOOP_aelem_bytes = 4,
773 T_NARROWKLASS_aelem_bytes = 4,
774 T_VOID_aelem_bytes = 0
775 };
776
777 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
778 #ifdef ASSERT
779 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
780 #else
781 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
782 #endif
783
784
785 // JavaValue serves as a container for arbitrary Java values.
786
787 class JavaValue {
788
789 public:
790 typedef union JavaCallValue {
791 jfloat f;
792 jdouble d;
793 jint i;
794 jlong l;
795 jobject h;
796 } JavaCallValue;
797
798 private:
799 BasicType _type;
800 JavaCallValue _value;
801
802 public:
803 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
804
805 JavaValue(jfloat value) {
806 _type = T_FLOAT;
807 _value.f = value;
808 }
809
810 JavaValue(jdouble value) {
811 _type = T_DOUBLE;
812 _value.d = value;
813 }
814
815 jfloat get_jfloat() const { return _value.f; }
816 jdouble get_jdouble() const { return _value.d; }
817 jint get_jint() const { return _value.i; }
818 jlong get_jlong() const { return _value.l; }
819 jobject get_jobject() const { return _value.h; }
820 JavaCallValue* get_value_addr() { return &_value; }
821 BasicType get_type() const { return _type; }
822
823 void set_jfloat(jfloat f) { _value.f = f;}
824 void set_jdouble(jdouble d) { _value.d = d;}
825 void set_jint(jint i) { _value.i = i;}
826 void set_jlong(jlong l) { _value.l = l;}
827 void set_jobject(jobject h) { _value.h = h;}
828 void set_type(BasicType t) { _type = t; }
829
830 jboolean get_jboolean() const { return (jboolean) (_value.i);}
831 jbyte get_jbyte() const { return (jbyte) (_value.i);}
832 jchar get_jchar() const { return (jchar) (_value.i);}
833 jshort get_jshort() const { return (jshort) (_value.i);}
834
835 };
836
837
838 #define STACK_BIAS 0
839 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
840 // in order to extend the reach of the stack pointer.
841 #if defined(SPARC) && defined(_LP64)
842 #undef STACK_BIAS
843 #define STACK_BIAS 0x7ff
844 #endif
845
846
847 // TosState describes the top-of-stack state before and after the execution of
848 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
849 // registers. The TosState corresponds to the 'machine representation' of this cached
850 // value. There's 4 states corresponding to the JAVA types int, long, float & double
851 // as well as a 5th state in case the top-of-stack value is actually on the top
852 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
853 // state when it comes to machine representation but is used separately for (oop)
854 // type specific operations (e.g. verification code).
855
856 enum TosState { // describes the tos cache contents
857 btos = 0, // byte, bool tos cached
858 ztos = 1, // byte, bool tos cached
859 ctos = 2, // char tos cached
860 stos = 3, // short tos cached
861 itos = 4, // int tos cached
862 ltos = 5, // long tos cached
863 ftos = 6, // float tos cached
864 dtos = 7, // double tos cached
865 atos = 8, // object cached
866 vtos = 9, // tos not cached
867 number_of_states,
868 ilgl // illegal state: should not occur
869 };
870
871
872 inline TosState as_TosState(BasicType type) {
873 switch (type) {
874 case T_BYTE : return btos;
875 case T_BOOLEAN: return ztos;
876 case T_CHAR : return ctos;
877 case T_SHORT : return stos;
878 case T_INT : return itos;
879 case T_LONG : return ltos;
880 case T_FLOAT : return ftos;
881 case T_DOUBLE : return dtos;
882 case T_VOID : return vtos;
883 case T_ARRAY : // fall through
884 case T_OBJECT : return atos;
885 }
886 return ilgl;
887 }
888
889 inline BasicType as_BasicType(TosState state) {
890 switch (state) {
891 case btos : return T_BYTE;
892 case ztos : return T_BOOLEAN;
893 case ctos : return T_CHAR;
894 case stos : return T_SHORT;
895 case itos : return T_INT;
896 case ltos : return T_LONG;
897 case ftos : return T_FLOAT;
898 case dtos : return T_DOUBLE;
899 case atos : return T_OBJECT;
900 case vtos : return T_VOID;
901 }
902 return T_ILLEGAL;
903 }
904
905
906 // Helper function to convert BasicType info into TosState
907 // Note: Cannot define here as it uses global constant at the time being.
908 TosState as_TosState(BasicType type);
909
910
911 // JavaThreadState keeps track of which part of the code a thread is executing in. This
912 // information is needed by the safepoint code.
913 //
914 // There are 4 essential states:
915 //
916 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
917 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
918 // _thread_in_vm : Executing in the vm
919 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
920 //
921 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
922 // a transition from one state to another. These extra states makes it possible for the safepoint code to
923 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
924 //
925 // Given a state, the xxxx_trans state can always be found by adding 1.
926 //
927 enum JavaThreadState {
928 _thread_uninitialized = 0, // should never happen (missing initialization)
929 _thread_new = 2, // just starting up, i.e., in process of being initialized
930 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
931 _thread_in_native = 4, // running in native code
932 _thread_in_native_trans = 5, // corresponding transition state
933 _thread_in_vm = 6, // running in VM
934 _thread_in_vm_trans = 7, // corresponding transition state
935 _thread_in_Java = 8, // running in Java or in stub code
936 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
937 _thread_blocked = 10, // blocked in vm
938 _thread_blocked_trans = 11, // corresponding transition state
939 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
940 };
941
942
943
944 //----------------------------------------------------------------------------------------------------
945 // 'Forward' declarations of frequently used classes
946 // (in order to reduce interface dependencies & reduce
947 // number of unnecessary compilations after changes)
948
949 class ClassFileStream;
950
951 class Event;
952
953 class Thread;
954 class VMThread;
955 class JavaThread;
956 class Threads;
957
958 class VM_Operation;
959 class VMOperationQueue;
960
961 class CodeBlob;
962 class CompiledMethod;
963 class nmethod;
964 class RuntimeBlob;
965 class OSRAdapter;
966 class I2CAdapter;
967 class C2IAdapter;
968 class CompiledIC;
969 class relocInfo;
970 class ScopeDesc;
971 class PcDesc;
972
973 class Recompiler;
974 class Recompilee;
975 class RecompilationPolicy;
976 class RFrame;
977 class CompiledRFrame;
978 class InterpretedRFrame;
979
980 class vframe;
981 class javaVFrame;
982 class interpretedVFrame;
983 class compiledVFrame;
984 class deoptimizedVFrame;
985 class externalVFrame;
986 class entryVFrame;
987
988 class RegisterMap;
989
990 class Mutex;
991 class Monitor;
992 class BasicLock;
993 class BasicObjectLock;
994
995 class PeriodicTask;
996
997 class JavaCallWrapper;
998
999 class oopDesc;
1000 class metaDataOopDesc;
1001
1002 class NativeCall;
1003
1004 class zone;
1005
1006 class StubQueue;
1007
1008 class outputStream;
1009
1010 class ResourceArea;
1011
1012 class DebugInformationRecorder;
1013 class ScopeValue;
1014 class CompressedStream;
1015 class DebugInfoReadStream;
1016 class DebugInfoWriteStream;
1017 class LocationValue;
1018 class ConstantValue;
1019 class IllegalValue;
1020
1021 class PrivilegedElement;
1022 class MonitorArray;
1023
1024 class MonitorInfo;
1025
1026 class OffsetClosure;
1027 class OopMapCache;
1028 class InterpreterOopMap;
1029 class OopMapCacheEntry;
1030 class OSThread;
1031
1032 typedef int (*OSThreadStartFunc)(void*);
1033
1034 class Space;
1035
1036 class JavaValue;
1037 class methodHandle;
1038 class JavaCallArguments;
1039
1040 // Basic support for errors.
1041 extern void basic_fatal(const char* msg);
1042
1043 //----------------------------------------------------------------------------------------------------
1044 // Special constants for debugging
1045
1046 const jint badInt = -3; // generic "bad int" value
1047 const long badAddressVal = -2; // generic "bad address" value
1048 const long badOopVal = -1; // generic "bad oop" value
1049 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
1050 const int badHandleValue = 0xBC; // value used to zap vm handle area
1051 const int badResourceValue = 0xAB; // value used to zap resource area
1052 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
1053 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
1054 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
1055 const intptr_t badJNIHandleVal = (intptr_t) UCONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area
1056 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
1057 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
1058 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
1059 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
1060
1061
1062 // (These must be implemented as #defines because C++ compilers are
1063 // not obligated to inline non-integral constants!)
1064 #define badAddress ((address)::badAddressVal)
1065 #define badOop (cast_to_oop(::badOopVal))
1066 #define badHeapWord (::badHeapWordVal)
1067 #define badJNIHandle (cast_to_oop(::badJNIHandleVal))
1068
1069 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
1070 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
1071
1072 //----------------------------------------------------------------------------------------------------
1073 // Utility functions for bitfield manipulations
1074
1075 const intptr_t AllBits = ~0; // all bits set in a word
1076 const intptr_t NoBits = 0; // no bits set in a word
1077 const jlong NoLongBits = 0; // no bits set in a long
1078 const intptr_t OneBit = 1; // only right_most bit set in a word
1079
1080 // get a word with the n.th or the right-most or left-most n bits set
1081 // (note: #define used only so that they can be used in enum constant definitions)
1082 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
1083 #define right_n_bits(n) (nth_bit(n) - 1)
1084 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
1085
1086 // bit-operations using a mask m
1087 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
1088 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
1089 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
1090 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
1091 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
1092
1093 // bit-operations using the n.th bit
1094 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
1095 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
1096 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1097
1098 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1099 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1100 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1101 }
1102
1103
1104 //----------------------------------------------------------------------------------------------------
1105 // Utility functions for integers
1106
1107 // Avoid use of global min/max macros which may cause unwanted double
1108 // evaluation of arguments.
1109 #ifdef max
1110 #undef max
1111 #endif
1112
1113 #ifdef min
1114 #undef min
1115 #endif
1116
1117 #define max(a,b) Do_not_use_max_use_MAX2_instead
1118 #define min(a,b) Do_not_use_min_use_MIN2_instead
1119
1120 // It is necessary to use templates here. Having normal overloaded
1121 // functions does not work because it is necessary to provide both 32-
1122 // and 64-bit overloaded functions, which does not work, and having
1123 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1124 // will be even more error-prone than macros.
1125 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1126 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1127 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1128 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1129 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1130 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1131
1132 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1133
1134 // true if x is a power of 2, false otherwise
1135 inline bool is_power_of_2(intptr_t x) {
1136 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1137 }
1138
1139 // long version of is_power_of_2
1140 inline bool is_power_of_2_long(jlong x) {
1141 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1142 }
1143
1144 // Returns largest i such that 2^i <= x.
1145 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1146 // If x == 0, the function returns -1.
1147 inline int log2_intptr(intptr_t x) {
1148 int i = -1;
1149 uintptr_t p = 1;
1150 while (p != 0 && p <= (uintptr_t)x) {
1151 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1152 i++; p *= 2;
1153 }
1154 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1155 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1156 return i;
1157 }
1158
1159 //* largest i such that 2^i <= x
1160 // A negative value of 'x' will return '63'
1161 inline int log2_long(jlong x) {
1162 int i = -1;
1163 julong p = 1;
1164 while (p != 0 && p <= (julong)x) {
1165 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1166 i++; p *= 2;
1167 }
1168 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1169 // (if p = 0 then overflow occurred and i = 63)
1170 return i;
1171 }
1172
1173 //* the argument must be exactly a power of 2
1174 inline int exact_log2(intptr_t x) {
1175 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1176 return log2_intptr(x);
1177 }
1178
1179 //* the argument must be exactly a power of 2
1180 inline int exact_log2_long(jlong x) {
1181 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1182 return log2_long(x);
1183 }
1184
1185
1186 // returns integer round-up to the nearest multiple of s (s must be a power of two)
1187 inline intptr_t round_to(intptr_t x, uintx s) {
1188 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s);
1189 const uintx m = s - 1;
1190 return mask_bits(x + m, ~m);
1191 }
1192
1193 // returns integer round-down to the nearest multiple of s (s must be a power of two)
1194 inline intptr_t round_down(intptr_t x, uintx s) {
1195 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s);
1196 const uintx m = s - 1;
1197 return mask_bits(x, ~m);
1198 }
1199
1200
1201 inline bool is_odd (intx x) { return x & 1; }
1202 inline bool is_even(intx x) { return !is_odd(x); }
1203
1204 // "to" should be greater than "from."
1205 inline intx byte_size(void* from, void* to) {
1206 return (address)to - (address)from;
1207 }
1208
1209 //----------------------------------------------------------------------------------------------------
1210 // Avoid non-portable casts with these routines (DEPRECATED)
1211
1212 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1213 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1214
1215 // Given sequence of four bytes, build into a 32-bit word
1216 // following the conventions used in class files.
1217 // On the 386, this could be realized with a simple address cast.
1218 //
1219
1220 // This routine takes eight bytes:
1221 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1222 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1223 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1224 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1225 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1226 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1227 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1228 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1229 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1230 }
1231
1232 // This routine takes four bytes:
1233 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1234 return (( u4(c1) << 24 ) & 0xff000000)
1235 | (( u4(c2) << 16 ) & 0x00ff0000)
1236 | (( u4(c3) << 8 ) & 0x0000ff00)
1237 | (( u4(c4) << 0 ) & 0x000000ff);
1238 }
1239
1240 // And this one works if the four bytes are contiguous in memory:
1241 inline u4 build_u4_from( u1* p ) {
1242 return build_u4_from( p[0], p[1], p[2], p[3] );
1243 }
1244
1245 // Ditto for two-byte ints:
1246 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1247 return u2((( u2(c1) << 8 ) & 0xff00)
1248 | (( u2(c2) << 0 ) & 0x00ff));
1249 }
1250
1251 // And this one works if the two bytes are contiguous in memory:
1252 inline u2 build_u2_from( u1* p ) {
1253 return build_u2_from( p[0], p[1] );
1254 }
1255
1256 // Ditto for floats:
1257 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1258 u4 u = build_u4_from( c1, c2, c3, c4 );
1259 return *(jfloat*)&u;
1260 }
1261
1262 inline jfloat build_float_from( u1* p ) {
1263 u4 u = build_u4_from( p );
1264 return *(jfloat*)&u;
1265 }
1266
1267
1268 // now (64-bit) longs
1269
1270 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1271 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1272 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1273 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1274 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1275 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1276 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1277 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1278 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1279 }
1280
1281 inline jlong build_long_from( u1* p ) {
1282 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1283 }
1284
1285
1286 // Doubles, too!
1287 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1288 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1289 return *(jdouble*)&u;
1290 }
1291
1292 inline jdouble build_double_from( u1* p ) {
1293 jlong u = build_long_from( p );
1294 return *(jdouble*)&u;
1295 }
1296
1297
1298 // Portable routines to go the other way:
1299
1300 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1301 c1 = u1(x >> 8);
1302 c2 = u1(x);
1303 }
1304
1305 inline void explode_short_to( u2 x, u1* p ) {
1306 explode_short_to( x, p[0], p[1]);
1307 }
1308
1309 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1310 c1 = u1(x >> 24);
1311 c2 = u1(x >> 16);
1312 c3 = u1(x >> 8);
1313 c4 = u1(x);
1314 }
1315
1316 inline void explode_int_to( u4 x, u1* p ) {
1317 explode_int_to( x, p[0], p[1], p[2], p[3]);
1318 }
1319
1320
1321 // Pack and extract shorts to/from ints:
1322
1323 inline int extract_low_short_from_int(jint x) {
1324 return x & 0xffff;
1325 }
1326
1327 inline int extract_high_short_from_int(jint x) {
1328 return (x >> 16) & 0xffff;
1329 }
1330
1331 inline int build_int_from_shorts( jushort low, jushort high ) {
1332 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1333 }
1334
1335 // Convert pointer to intptr_t, for use in printing pointers.
1336 inline intptr_t p2i(const void * p) {
1337 return (intptr_t) p;
1338 }
1339
1340 // swap a & b
1341 template<class T> static void swap(T& a, T& b) {
1342 T tmp = a;
1343 a = b;
1344 b = tmp;
1345 }
1346
1347 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1348
1349 //----------------------------------------------------------------------------------------------------
1350 // Sum and product which can never overflow: they wrap, just like the
1351 // Java operations. Note that we don't intend these to be used for
1352 // general-purpose arithmetic: their purpose is to emulate Java
1353 // operations.
1354
1355 // The goal of this code to avoid undefined or implementation-defined
1356 // behavior. The use of an lvalue to reference cast is explicitly
1357 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1358 // 15 in C++03]
1359 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1360 inline TYPE NAME (TYPE in1, TYPE in2) { \
1361 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1362 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1363 return reinterpret_cast<TYPE&>(ures); \
1364 }
1365
1366 JAVA_INTEGER_OP(+, java_add, jint, juint)
1367 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1368 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1369 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1370 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1371 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1372
1373 #undef JAVA_INTEGER_OP
1374
1375 // Dereference vptr
1376 // All C++ compilers that we know of have the vtbl pointer in the first
1377 // word. If there are exceptions, this function needs to be made compiler
1378 // specific.
1379 static inline void* dereference_vptr(const void* addr) {
1380 return *(void**)addr;
1381 }
1382
1383 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP