1 /*
2 * Copyright (c) 1997, 2018, 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 #ifndef ATTRIBUTE_ALIGNED
43 #define ATTRIBUTE_ALIGNED(x)
44 #endif
45
46 // This file holds all globally used constants & types, class (forward)
47 // declarations and a few frequently used utility functions.
48
49 //----------------------------------------------------------------------------------------------------
50 // Printf-style formatters for fixed- and variable-width types as pointers and
51 // integers. These are derived from the definitions in inttypes.h. If the platform
52 // doesn't provide appropriate definitions, they should be provided in
53 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
54
55 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
56
57 // Format 32-bit quantities.
58 #define INT32_FORMAT "%" PRId32
59 #define UINT32_FORMAT "%" PRIu32
60 #define INT32_FORMAT_W(width) "%" #width PRId32
61 #define UINT32_FORMAT_W(width) "%" #width PRIu32
62
63 #define PTR32_FORMAT "0x%08" PRIx32
64 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32
65
66 // Format 64-bit quantities.
67 #define INT64_FORMAT "%" PRId64
68 #define UINT64_FORMAT "%" PRIu64
69 #define UINT64_FORMAT_X "%" PRIx64
70 #define INT64_FORMAT_W(width) "%" #width PRId64
71 #define UINT64_FORMAT_W(width) "%" #width PRIu64
72
73 #define PTR64_FORMAT "0x%016" PRIx64
74
75 // Format jlong, if necessary
76 #ifndef JLONG_FORMAT
77 #define JLONG_FORMAT INT64_FORMAT
78 #endif
79 #ifndef JULONG_FORMAT
80 #define JULONG_FORMAT UINT64_FORMAT
81 #endif
82 #ifndef JULONG_FORMAT_X
83 #define JULONG_FORMAT_X UINT64_FORMAT_X
84 #endif
85
86 // Format pointers which change size between 32- and 64-bit.
87 #ifdef _LP64
88 #define INTPTR_FORMAT "0x%016" PRIxPTR
89 #define PTR_FORMAT "0x%016" PRIxPTR
90 #else // !_LP64
91 #define INTPTR_FORMAT "0x%08" PRIxPTR
92 #define PTR_FORMAT "0x%08" PRIxPTR
93 #endif // _LP64
94
95 // Format pointers without leading zeros
96 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
97
98 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
99
100 #define SSIZE_FORMAT "%" PRIdPTR
101 #define SIZE_FORMAT "%" PRIuPTR
102 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
103 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
104 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
105 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
106
107 #define INTX_FORMAT "%" PRIdPTR
108 #define UINTX_FORMAT "%" PRIuPTR
109 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
110 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
111
112 //----------------------------------------------------------------------------------------------------
113 // Constants
114
115 const int LogBytesPerShort = 1;
116 const int LogBytesPerInt = 2;
117 #ifdef _LP64
118 const int LogBytesPerWord = 3;
119 #else
120 const int LogBytesPerWord = 2;
121 #endif
122 const int LogBytesPerLong = 3;
123
124 const int BytesPerShort = 1 << LogBytesPerShort;
125 const int BytesPerInt = 1 << LogBytesPerInt;
126 const int BytesPerWord = 1 << LogBytesPerWord;
127 const int BytesPerLong = 1 << LogBytesPerLong;
128
129 const int LogBitsPerByte = 3;
130 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
131 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
132 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
133 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
134
135 const int BitsPerByte = 1 << LogBitsPerByte;
136 const int BitsPerShort = 1 << LogBitsPerShort;
137 const int BitsPerInt = 1 << LogBitsPerInt;
138 const int BitsPerWord = 1 << LogBitsPerWord;
139 const int BitsPerLong = 1 << LogBitsPerLong;
140
141 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
142 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
143
144 const int WordsPerLong = 2; // Number of stack entries for longs
145
146 const int oopSize = sizeof(char*); // Full-width oop
147 extern int heapOopSize; // Oop within a java object
148 const int wordSize = sizeof(char*);
149 const int longSize = sizeof(jlong);
150 const int jintSize = sizeof(jint);
151 const int size_tSize = sizeof(size_t);
152
153 const int BytesPerOop = BytesPerWord; // Full-width oop
154
155 extern int LogBytesPerHeapOop; // Oop within a java object
156 extern int LogBitsPerHeapOop;
157 extern int BytesPerHeapOop;
158 extern int BitsPerHeapOop;
159
160 const int BitsPerJavaInteger = 32;
161 const int BitsPerJavaLong = 64;
162 const int BitsPerSize_t = size_tSize * BitsPerByte;
163
164 // Size of a char[] needed to represent a jint as a string in decimal.
165 const int jintAsStringSize = 12;
166
167 // In fact this should be
168 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
169 // see os::set_memory_serialize_page()
170 #ifdef _LP64
171 const int SerializePageShiftCount = 4;
172 #else
173 const int SerializePageShiftCount = 3;
174 #endif
175
176 // An opaque struct of heap-word width, so that HeapWord* can be a generic
177 // pointer into the heap. We require that object sizes be measured in
178 // units of heap words, so that that
179 // HeapWord* hw;
180 // hw += oop(hw)->foo();
181 // works, where foo is a method (like size or scavenge) that returns the
182 // object size.
183 class HeapWord {
184 friend class VMStructs;
185 private:
186 char* i;
187 #ifndef PRODUCT
188 public:
189 char* value() { return i; }
190 #endif
191 };
192
193 // Analogous opaque struct for metadata allocated from
194 // metaspaces.
195 class MetaWord {
196 private:
197 char* i;
198 };
199
200 // HeapWordSize must be 2^LogHeapWordSize.
201 const int HeapWordSize = sizeof(HeapWord);
202 #ifdef _LP64
203 const int LogHeapWordSize = 3;
204 #else
205 const int LogHeapWordSize = 2;
206 #endif
207 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
208 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
209
210 // The minimum number of native machine words necessary to contain "byte_size"
211 // bytes.
212 inline size_t heap_word_size(size_t byte_size) {
213 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
214 }
215
216 //-------------------------------------------
217 // Constant for jlong (standardized by C++11)
218
219 // Build a 64bit integer constant
220 #define CONST64(x) (x ## LL)
221 #define UCONST64(x) (x ## ULL)
222
223 const jlong min_jlong = CONST64(0x8000000000000000);
224 const jlong max_jlong = CONST64(0x7fffffffffffffff);
225
226 const size_t K = 1024;
227 const size_t M = K*K;
228 const size_t G = M*K;
229 const size_t HWperKB = K / sizeof(HeapWord);
230
231 // Constants for converting from a base unit to milli-base units. For
232 // example from seconds to milliseconds and microseconds
233
234 const int MILLIUNITS = 1000; // milli units per base unit
235 const int MICROUNITS = 1000000; // micro units per base unit
236 const int NANOUNITS = 1000000000; // nano units per base unit
237
238 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
239 const jint NANOSECS_PER_MILLISEC = 1000000;
240
241 inline const char* proper_unit_for_byte_size(size_t s) {
242 #ifdef _LP64
243 if (s >= 10*G) {
244 return "G";
245 }
246 #endif
247 if (s >= 10*M) {
248 return "M";
249 } else if (s >= 10*K) {
250 return "K";
251 } else {
252 return "B";
253 }
254 }
255
256 template <class T>
257 inline T byte_size_in_proper_unit(T s) {
258 #ifdef _LP64
259 if (s >= 10*G) {
260 return (T)(s/G);
261 }
262 #endif
263 if (s >= 10*M) {
264 return (T)(s/M);
265 } else if (s >= 10*K) {
266 return (T)(s/K);
267 } else {
268 return s;
269 }
270 }
271
272 inline const char* exact_unit_for_byte_size(size_t s) {
273 #ifdef _LP64
274 if (s >= G && (s % G) == 0) {
275 return "G";
276 }
277 #endif
278 if (s >= M && (s % M) == 0) {
279 return "M";
280 }
281 if (s >= K && (s % K) == 0) {
282 return "K";
283 }
284 return "B";
285 }
286
287 inline size_t byte_size_in_exact_unit(size_t s) {
288 #ifdef _LP64
289 if (s >= G && (s % G) == 0) {
290 return s / G;
291 }
292 #endif
293 if (s >= M && (s % M) == 0) {
294 return s / M;
295 }
296 if (s >= K && (s % K) == 0) {
297 return s / K;
298 }
299 return s;
300 }
301
302 //----------------------------------------------------------------------------------------------------
303 // VM type definitions
304
305 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
306 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
307
308 typedef intptr_t intx;
309 typedef uintptr_t uintx;
310
311 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
312 const intx max_intx = (uintx)min_intx - 1;
313 const uintx max_uintx = (uintx)-1;
314
315 // Table of values:
316 // sizeof intx 4 8
317 // min_intx 0x80000000 0x8000000000000000
318 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
319 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
320
321 typedef unsigned int uint; NEEDS_CLEANUP
322
323
324 //----------------------------------------------------------------------------------------------------
325 // Java type definitions
326
327 // All kinds of 'plain' byte addresses
328 typedef signed char s_char;
329 typedef unsigned char u_char;
330 typedef u_char* address;
331 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
332 // except for some implementations of a C++
333 // linkage pointer to function. Should never
334 // need one of those to be placed in this
335 // type anyway.
336
337 // Utility functions to "portably" (?) bit twiddle pointers
338 // Where portable means keep ANSI C++ compilers quiet
339
340 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
341 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
342
343 // Utility functions to "portably" make cast to/from function pointers.
344
345 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
346 inline address_word castable_address(address x) { return address_word(x) ; }
347 inline address_word castable_address(void* x) { return address_word(x) ; }
348
349 // Pointer subtraction.
350 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
351 // the range we might need to find differences from one end of the heap
352 // to the other.
353 // A typical use might be:
354 // if (pointer_delta(end(), top()) >= size) {
355 // // enough room for an object of size
356 // ...
357 // and then additions like
358 // ... top() + size ...
359 // are safe because we know that top() is at least size below end().
360 inline size_t pointer_delta(const volatile void* left,
361 const volatile void* right,
362 size_t element_size) {
363 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
364 }
365
366 // A version specialized for HeapWord*'s.
367 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
368 return pointer_delta(left, right, sizeof(HeapWord));
369 }
370 // A version specialized for MetaWord*'s.
371 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
372 return pointer_delta(left, right, sizeof(MetaWord));
373 }
374
375 //
376 // ANSI C++ does not allow casting from one pointer type to a function pointer
377 // directly without at best a warning. This macro accomplishes it silently
378 // In every case that is present at this point the value be cast is a pointer
379 // to a C linkage function. In some case the type used for the cast reflects
380 // that linkage and a picky compiler would not complain. In other cases because
381 // there is no convenient place to place a typedef with extern C linkage (i.e
382 // a platform dependent header file) it doesn't. At this point no compiler seems
383 // picky enough to catch these instances (which are few). It is possible that
384 // using templates could fix these for all cases. This use of templates is likely
385 // so far from the middle of the road that it is likely to be problematic in
386 // many C++ compilers.
387 //
388 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
389 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
390
391 // Unsigned byte types for os and stream.hpp
392
393 // Unsigned one, two, four and eigth byte quantities used for describing
394 // the .class file format. See JVM book chapter 4.
395
396 typedef jubyte u1;
397 typedef jushort u2;
398 typedef juint u4;
399 typedef julong u8;
400
401 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
402 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
403 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
404 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
405
406 typedef jbyte s1;
407 typedef jshort s2;
408 typedef jint s4;
409 typedef jlong s8;
410
411 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
412 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
413 const jshort min_jshort = -(1 << 15); // smallest jshort
414 const jshort max_jshort = (1 << 15) - 1; // largest jshort
415
416 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
417 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
418
419 //----------------------------------------------------------------------------------------------------
420 // JVM spec restrictions
421
422 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
423
424 //----------------------------------------------------------------------------------------------------
425 // Default and minimum StringTable and SymbolTable size values
426 // Must be a power of 2
427
428 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
429 const size_t minimumStringTableSize = 128;
430
431 const size_t defaultSymbolTableSize = 32768; // 2^15
432 const size_t minimumSymbolTableSize = 1024;
433
434
435 //----------------------------------------------------------------------------------------------------
436 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
437 //
438 // Determines whether on-the-fly class replacement and frame popping are enabled.
439
440 #define HOTSWAP
441
442 //----------------------------------------------------------------------------------------------------
443 // Object alignment, in units of HeapWords.
444 //
445 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
446 // reference fields can be naturally aligned.
447
448 extern int MinObjAlignment;
449 extern int MinObjAlignmentInBytes;
450 extern int MinObjAlignmentInBytesMask;
451
452 extern int LogMinObjAlignment;
453 extern int LogMinObjAlignmentInBytes;
454
455 const int LogKlassAlignmentInBytes = 3;
456 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
457 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
458 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
459
460 // Maximal size of heap where unscaled compression can be used. Also upper bound
461 // for heap placement: 4GB.
462 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
463 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
464 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
465 extern uint64_t OopEncodingHeapMax;
466
467 // Maximal size of compressed class space. Above this limit compression is not possible.
468 // Also upper bound for placement of zero based class space. (Class space is further limited
469 // to be < 3G, see arguments.cpp.)
470 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
471
472 // Machine dependent stuff
473
474 // The maximum size of the code cache. Can be overridden by targets.
475 #define CODE_CACHE_SIZE_LIMIT (2*G)
476 // Allow targets to reduce the default size of the code cache.
477 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
478
479 #include CPU_HEADER(globalDefinitions)
480
481 // To assure the IRIW property on processors that are not multiple copy
482 // atomic, sync instructions must be issued between volatile reads to
483 // assure their ordering, instead of after volatile stores.
484 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
485 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
486 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
487 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
488 #else
489 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
490 #endif
491
492 // The expected size in bytes of a cache line, used to pad data structures.
493 #ifndef DEFAULT_CACHE_LINE_SIZE
494 #define DEFAULT_CACHE_LINE_SIZE 64
495 #endif
496
497
498 //----------------------------------------------------------------------------------------------------
499 // Utility macros for compilers
500 // used to silence compiler warnings
501
502 #define Unused_Variable(var) var
503
504
505 //----------------------------------------------------------------------------------------------------
506 // Prototyping
507 // "Code Missing Here" macro, un-define when integrating back from prototyping stage and break
508 // compilation on purpose (i.e. "forget me not")
509 #define PROTOTYPE
510 #ifdef PROTOTYPE
511 #define CMH(m)
512 #endif
513
514 //----------------------------------------------------------------------------------------------------
515 // Miscellaneous
516
517 // 6302670 Eliminate Hotspot __fabsf dependency
518 // All fabs() callers should call this function instead, which will implicitly
519 // convert the operand to double, avoiding a dependency on __fabsf which
520 // doesn't exist in early versions of Solaris 8.
521 inline double fabsd(double value) {
522 return fabs(value);
523 }
524
525 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
526 // is zero, return 0.0.
527 template<typename T>
528 inline double percent_of(T numerator, T denominator) {
529 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
530 }
531
532 //----------------------------------------------------------------------------------------------------
533 // Special casts
534 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
535 typedef union {
536 jfloat f;
537 jint i;
538 } FloatIntConv;
539
540 typedef union {
541 jdouble d;
542 jlong l;
543 julong ul;
544 } DoubleLongConv;
545
546 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
547 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
548
549 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
550 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
551 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
552
553 inline jint low (jlong value) { return jint(value); }
554 inline jint high(jlong value) { return jint(value >> 32); }
555
556 // the fancy casts are a hopefully portable way
557 // to do unsigned 32 to 64 bit type conversion
558 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
559 *value |= (jlong)(julong)(juint)low; }
560
561 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
562 *value |= (jlong)high << 32; }
563
564 inline jlong jlong_from(jint h, jint l) {
565 jlong result = 0; // initialization to avoid warning
566 set_high(&result, h);
567 set_low(&result, l);
568 return result;
569 }
570
571 union jlong_accessor {
572 jint words[2];
573 jlong long_value;
574 };
575
576 void basic_types_init(); // cannot define here; uses assert
577
578
579 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
580 enum BasicType {
581 T_BOOLEAN = 4,
582 T_CHAR = 5,
583 T_FLOAT = 6,
584 T_DOUBLE = 7,
585 T_BYTE = 8,
586 T_SHORT = 9,
587 T_INT = 10,
588 T_LONG = 11,
589 T_OBJECT = 12,
590 T_ARRAY = 13,
591 T_VALUETYPE = 14,
592 T_VOID = 15,
593 T_ADDRESS = 16,
594 T_NARROWOOP = 17,
595 T_METADATA = 18,
596 T_NARROWKLASS = 19,
597 T_VALUETYPEPTR= 20, // the compiler needs a way to identify buffered values
598 T_CONFLICT = 21, // for stack value type with conflicting contents
599 T_ILLEGAL = 99
600 };
601
602 inline bool is_java_primitive(BasicType t) {
603 return T_BOOLEAN <= t && t <= T_LONG;
604 }
605
606 inline bool is_subword_type(BasicType t) {
607 // these guys are processed exactly like T_INT in calling sequences:
608 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
609 }
610
611 inline bool is_signed_subword_type(BasicType t) {
612 return (t == T_BYTE || t == T_SHORT);
613 }
614
615 inline bool is_reference_type(BasicType t) {
616 return (t == T_OBJECT || t == T_ARRAY);
617 }
618
619 // Convert a char from a classfile signature to a BasicType
620 inline BasicType char2type(char c) {
621 switch( c ) {
622 case 'B': return T_BYTE;
623 case 'C': return T_CHAR;
624 case 'D': return T_DOUBLE;
625 case 'F': return T_FLOAT;
626 case 'I': return T_INT;
627 case 'J': return T_LONG;
628 case 'S': return T_SHORT;
629 case 'Z': return T_BOOLEAN;
630 case 'V': return T_VOID;
631 case 'L': return T_OBJECT;
632 case '[': return T_ARRAY;
633 case 'Q': return T_VALUETYPE;
634 }
635 return T_ILLEGAL;
636 }
637
638 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
639 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
640 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
641 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
642 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
643 extern BasicType name2type(const char* name);
644
645 // Auxiliary math routines
646 // least common multiple
647 extern size_t lcm(size_t a, size_t b);
648
649
650 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
651 enum BasicTypeSize {
652 T_BOOLEAN_size = 1,
653 T_CHAR_size = 1,
654 T_FLOAT_size = 1,
655 T_DOUBLE_size = 2,
656 T_BYTE_size = 1,
657 T_SHORT_size = 1,
658 T_INT_size = 1,
659 T_LONG_size = 2,
660 T_OBJECT_size = 1,
661 T_ARRAY_size = 1,
662 T_NARROWOOP_size = 1,
663 T_NARROWKLASS_size = 1,
664 T_VOID_size = 0,
665 T_VALUETYPE_size = 1
666 };
667
668
669 // maps a BasicType to its instance field storage type:
670 // all sub-word integral types are widened to T_INT
671 extern BasicType type2field[T_CONFLICT+1];
672 extern BasicType type2wfield[T_CONFLICT+1];
673
674
675 // size in bytes
676 enum ArrayElementSize {
677 T_BOOLEAN_aelem_bytes = 1,
678 T_CHAR_aelem_bytes = 2,
679 T_FLOAT_aelem_bytes = 4,
680 T_DOUBLE_aelem_bytes = 8,
681 T_BYTE_aelem_bytes = 1,
682 T_SHORT_aelem_bytes = 2,
683 T_INT_aelem_bytes = 4,
684 T_LONG_aelem_bytes = 8,
685 #ifdef _LP64
686 T_OBJECT_aelem_bytes = 8,
687 T_ARRAY_aelem_bytes = 8,
688 T_VALUETYPE_aelem_bytes = 8,
689 #else
690 T_OBJECT_aelem_bytes = 4,
691 T_ARRAY_aelem_bytes = 4,
692 T_VALUETYPE_aelem_bytes = 4,
693 #endif
694 T_NARROWOOP_aelem_bytes = 4,
695 T_NARROWKLASS_aelem_bytes = 4,
696 T_VOID_aelem_bytes = 0,
697 #ifdef _LP64
698 T_VALUETYPEPTR_aelem_bytes= 8
699 #else
700 T_VALUETYPEPTR_aelem_bytes= 4
701 #endif
702 };
703
704 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
705 #ifdef ASSERT
706 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
707 #else
708 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
709 #endif
710
711
712 // JavaValue serves as a container for arbitrary Java values.
713
714 class JavaValue {
715
716 public:
717 typedef union JavaCallValue {
718 jfloat f;
719 jdouble d;
720 jint i;
721 jlong l;
722 jobject h;
723 jvaluetype q;
724 } JavaCallValue;
725
726 private:
727 BasicType _type;
728 JavaCallValue _value;
729
730 public:
731 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
732
733 JavaValue(jfloat value) {
734 _type = T_FLOAT;
735 _value.f = value;
736 }
737
738 JavaValue(jdouble value) {
739 _type = T_DOUBLE;
740 _value.d = value;
741 }
742
743 jfloat get_jfloat() const { return _value.f; }
744 jdouble get_jdouble() const { return _value.d; }
745 jint get_jint() const { return _value.i; }
746 jlong get_jlong() const { return _value.l; }
747 jobject get_jobject() const { return _value.h; }
748 JavaCallValue* get_value_addr() { return &_value; }
749 BasicType get_type() const { return _type; }
750
751 void set_jfloat(jfloat f) { _value.f = f;}
752 void set_jdouble(jdouble d) { _value.d = d;}
753 void set_jint(jint i) { _value.i = i;}
754 void set_jlong(jlong l) { _value.l = l;}
755 void set_jobject(jobject h) { _value.h = h;}
756 void set_type(BasicType t) { _type = t; }
757
758 jboolean get_jboolean() const { return (jboolean) (_value.i);}
759 jbyte get_jbyte() const { return (jbyte) (_value.i);}
760 jchar get_jchar() const { return (jchar) (_value.i);}
761 jshort get_jshort() const { return (jshort) (_value.i);}
762
763 };
764
765
766 #define STACK_BIAS 0
767 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
768 // in order to extend the reach of the stack pointer.
769 #if defined(SPARC) && defined(_LP64)
770 #undef STACK_BIAS
771 #define STACK_BIAS 0x7ff
772 #endif
773
774
775 // TosState describes the top-of-stack state before and after the execution of
776 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
777 // registers. The TosState corresponds to the 'machine representation' of this cached
778 // value. There's 4 states corresponding to the JAVA types int, long, float & double
779 // as well as a 5th state in case the top-of-stack value is actually on the top
780 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
781 // state when it comes to machine representation but is used separately for (oop)
782 // type specific operations (e.g. verification code).
783
784 enum TosState { // describes the tos cache contents
785 btos = 0, // byte, bool tos cached
786 ztos = 1, // byte, bool tos cached
787 ctos = 2, // char tos cached
788 stos = 3, // short tos cached
789 itos = 4, // int tos cached
790 ltos = 5, // long tos cached
791 ftos = 6, // float tos cached
792 dtos = 7, // double tos cached
793 atos = 8, // object cached
794 vtos = 9, // tos not cached,
795 number_of_states,
796 ilgl // illegal state: should not occur
797 };
798
799
800 inline TosState as_TosState(BasicType type) {
801 switch (type) {
802 case T_BYTE : return btos;
803 case T_BOOLEAN: return ztos;
804 case T_CHAR : return ctos;
805 case T_SHORT : return stos;
806 case T_INT : return itos;
807 case T_LONG : return ltos;
808 case T_FLOAT : return ftos;
809 case T_DOUBLE : return dtos;
810 case T_VOID : return vtos;
811 case T_VALUETYPE: // fall through
812 case T_ARRAY : // fall through
813 case T_OBJECT : return atos;
814 default : return ilgl;
815 }
816 }
817
818 inline BasicType as_BasicType(TosState state) {
819 switch (state) {
820 case btos : return T_BYTE;
821 case ztos : return T_BOOLEAN;
822 case ctos : return T_CHAR;
823 case stos : return T_SHORT;
824 case itos : return T_INT;
825 case ltos : return T_LONG;
826 case ftos : return T_FLOAT;
827 case dtos : return T_DOUBLE;
828 case atos : return T_OBJECT;
829 case vtos : return T_VOID;
830 default : return T_ILLEGAL;
831 }
832 }
833
834
835 // Helper function to convert BasicType info into TosState
836 // Note: Cannot define here as it uses global constant at the time being.
837 TosState as_TosState(BasicType type);
838
839
840 // JavaThreadState keeps track of which part of the code a thread is executing in. This
841 // information is needed by the safepoint code.
842 //
843 // There are 4 essential states:
844 //
845 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
846 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
847 // _thread_in_vm : Executing in the vm
848 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
849 //
850 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
851 // a transition from one state to another. These extra states makes it possible for the safepoint code to
852 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
853 //
854 // Given a state, the xxxx_trans state can always be found by adding 1.
855 //
856 enum JavaThreadState {
857 _thread_uninitialized = 0, // should never happen (missing initialization)
858 _thread_new = 2, // just starting up, i.e., in process of being initialized
859 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
860 _thread_in_native = 4, // running in native code
861 _thread_in_native_trans = 5, // corresponding transition state
862 _thread_in_vm = 6, // running in VM
863 _thread_in_vm_trans = 7, // corresponding transition state
864 _thread_in_Java = 8, // running in Java or in stub code
865 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
866 _thread_blocked = 10, // blocked in vm
867 _thread_blocked_trans = 11, // corresponding transition state
868 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
869 };
870
871
872
873 //----------------------------------------------------------------------------------------------------
874 // 'Forward' declarations of frequently used classes
875 // (in order to reduce interface dependencies & reduce
876 // number of unnecessary compilations after changes)
877
878 class ClassFileStream;
879
880 class Event;
881
882 class Thread;
883 class VMThread;
884 class JavaThread;
885 class Threads;
886
887 class VM_Operation;
888 class VMOperationQueue;
889
890 class CodeBlob;
891 class CompiledMethod;
892 class nmethod;
893 class RuntimeBlob;
894 class OSRAdapter;
895 class I2CAdapter;
896 class C2IAdapter;
897 class CompiledIC;
898 class relocInfo;
899 class ScopeDesc;
900 class PcDesc;
901
902 class Recompiler;
903 class Recompilee;
904 class RecompilationPolicy;
905 class RFrame;
906 class CompiledRFrame;
907 class InterpretedRFrame;
908
909 class vframe;
910 class javaVFrame;
911 class interpretedVFrame;
912 class compiledVFrame;
913 class deoptimizedVFrame;
914 class externalVFrame;
915 class entryVFrame;
916
917 class RegisterMap;
918
919 class Mutex;
920 class Monitor;
921 class BasicLock;
922 class BasicObjectLock;
923
924 class PeriodicTask;
925
926 class JavaCallWrapper;
927
928 class oopDesc;
929 class metaDataOopDesc;
930
931 class NativeCall;
932
933 class zone;
934
935 class StubQueue;
936
937 class outputStream;
938
939 class ResourceArea;
940
941 class DebugInformationRecorder;
942 class ScopeValue;
943 class CompressedStream;
944 class DebugInfoReadStream;
945 class DebugInfoWriteStream;
946 class LocationValue;
947 class ConstantValue;
948 class IllegalValue;
949
950 class PrivilegedElement;
951 class MonitorArray;
952
953 class MonitorInfo;
954
955 class OffsetClosure;
956 class OopMapCache;
957 class InterpreterOopMap;
958 class OopMapCacheEntry;
959 class OSThread;
960
961 typedef int (*OSThreadStartFunc)(void*);
962
963 class Space;
964
965 class JavaValue;
966 class methodHandle;
967 class JavaCallArguments;
968
969 //----------------------------------------------------------------------------------------------------
970 // Special constants for debugging
971
972 const jint badInt = -3; // generic "bad int" value
973 const intptr_t badAddressVal = -2; // generic "bad address" value
974 const intptr_t badOopVal = -1; // generic "bad oop" value
975 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
976 const int badStackSegVal = 0xCA; // value used to zap stack segments
977 const int badHandleValue = 0xBC; // value used to zap vm handle area
978 const int badResourceValue = 0xAB; // value used to zap resource area
979 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
980 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
981 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
982 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
983 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
984 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
985 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
986
987
988 // (These must be implemented as #defines because C++ compilers are
989 // not obligated to inline non-integral constants!)
990 #define badAddress ((address)::badAddressVal)
991 #define badOop (cast_to_oop(::badOopVal))
992 #define badHeapWord (::badHeapWordVal)
993
994 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
995 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
996
997 //----------------------------------------------------------------------------------------------------
998 // Utility functions for bitfield manipulations
999
1000 const intptr_t AllBits = ~0; // all bits set in a word
1001 const intptr_t NoBits = 0; // no bits set in a word
1002 const jlong NoLongBits = 0; // no bits set in a long
1003 const intptr_t OneBit = 1; // only right_most bit set in a word
1004
1005 // get a word with the n.th or the right-most or left-most n bits set
1006 // (note: #define used only so that they can be used in enum constant definitions)
1007 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
1008 #define right_n_bits(n) (nth_bit(n) - 1)
1009 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
1010
1011 // bit-operations using a mask m
1012 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
1013 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
1014 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
1015 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
1016 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
1017
1018 // bit-operations using the n.th bit
1019 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
1020 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
1021 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1022
1023 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1024 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1025 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1026 }
1027
1028
1029 //----------------------------------------------------------------------------------------------------
1030 // Utility functions for integers
1031
1032 // Avoid use of global min/max macros which may cause unwanted double
1033 // evaluation of arguments.
1034 #ifdef max
1035 #undef max
1036 #endif
1037
1038 #ifdef min
1039 #undef min
1040 #endif
1041
1042 // It is necessary to use templates here. Having normal overloaded
1043 // functions does not work because it is necessary to provide both 32-
1044 // and 64-bit overloaded functions, which does not work, and having
1045 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1046 // will be even more error-prone than macros.
1047 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1048 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1049 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1050 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1051 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1052 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1053
1054 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1055
1056 // true if x is a power of 2, false otherwise
1057 inline bool is_power_of_2(intptr_t x) {
1058 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1059 }
1060
1061 // long version of is_power_of_2
1062 inline bool is_power_of_2_long(jlong x) {
1063 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1064 }
1065
1066 // Returns largest i such that 2^i <= x.
1067 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1068 // If x == 0, the function returns -1.
1069 inline int log2_intptr(intptr_t x) {
1070 int i = -1;
1071 uintptr_t p = 1;
1072 while (p != 0 && p <= (uintptr_t)x) {
1073 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1074 i++; p *= 2;
1075 }
1076 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1077 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1078 return i;
1079 }
1080
1081 //* largest i such that 2^i <= x
1082 // A negative value of 'x' will return '63'
1083 inline int log2_long(jlong x) {
1084 int i = -1;
1085 julong p = 1;
1086 while (p != 0 && p <= (julong)x) {
1087 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1088 i++; p *= 2;
1089 }
1090 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1091 // (if p = 0 then overflow occurred and i = 63)
1092 return i;
1093 }
1094
1095 //* the argument must be exactly a power of 2
1096 inline int exact_log2(intptr_t x) {
1097 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1098 return log2_intptr(x);
1099 }
1100
1101 // the argument doesn't need to be a power of two
1102 inline int upper_log2(intptr_t x) {
1103 int shift = log2_intptr(x);
1104 intptr_t y = 1ULL << shift;
1105 if (y < x) {
1106 shift++;
1107 }
1108 return shift;
1109 }
1110
1111 //* the argument must be exactly a power of 2
1112 inline int exact_log2_long(jlong x) {
1113 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1114 return log2_long(x);
1115 }
1116
1117 inline bool is_odd (intx x) { return x & 1; }
1118 inline bool is_even(intx x) { return !is_odd(x); }
1119
1120 // "to" should be greater than "from."
1121 inline intx byte_size(void* from, void* to) {
1122 return (address)to - (address)from;
1123 }
1124
1125 //----------------------------------------------------------------------------------------------------
1126 // Avoid non-portable casts with these routines (DEPRECATED)
1127
1128 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1129 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1130
1131 // Given sequence of four bytes, build into a 32-bit word
1132 // following the conventions used in class files.
1133 // On the 386, this could be realized with a simple address cast.
1134 //
1135
1136 // This routine takes eight bytes:
1137 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1138 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1139 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1140 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1141 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1142 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1143 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1144 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1145 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1146 }
1147
1148 // This routine takes four bytes:
1149 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1150 return (( u4(c1) << 24 ) & 0xff000000)
1151 | (( u4(c2) << 16 ) & 0x00ff0000)
1152 | (( u4(c3) << 8 ) & 0x0000ff00)
1153 | (( u4(c4) << 0 ) & 0x000000ff);
1154 }
1155
1156 // And this one works if the four bytes are contiguous in memory:
1157 inline u4 build_u4_from( u1* p ) {
1158 return build_u4_from( p[0], p[1], p[2], p[3] );
1159 }
1160
1161 // Ditto for two-byte ints:
1162 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1163 return u2((( u2(c1) << 8 ) & 0xff00)
1164 | (( u2(c2) << 0 ) & 0x00ff));
1165 }
1166
1167 // And this one works if the two bytes are contiguous in memory:
1168 inline u2 build_u2_from( u1* p ) {
1169 return build_u2_from( p[0], p[1] );
1170 }
1171
1172 // Ditto for floats:
1173 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1174 u4 u = build_u4_from( c1, c2, c3, c4 );
1175 return *(jfloat*)&u;
1176 }
1177
1178 inline jfloat build_float_from( u1* p ) {
1179 u4 u = build_u4_from( p );
1180 return *(jfloat*)&u;
1181 }
1182
1183
1184 // now (64-bit) longs
1185
1186 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1187 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1188 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1189 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1190 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1191 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1192 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1193 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1194 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1195 }
1196
1197 inline jlong build_long_from( u1* p ) {
1198 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1199 }
1200
1201
1202 // Doubles, too!
1203 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1204 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1205 return *(jdouble*)&u;
1206 }
1207
1208 inline jdouble build_double_from( u1* p ) {
1209 jlong u = build_long_from( p );
1210 return *(jdouble*)&u;
1211 }
1212
1213
1214 // Portable routines to go the other way:
1215
1216 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1217 c1 = u1(x >> 8);
1218 c2 = u1(x);
1219 }
1220
1221 inline void explode_short_to( u2 x, u1* p ) {
1222 explode_short_to( x, p[0], p[1]);
1223 }
1224
1225 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1226 c1 = u1(x >> 24);
1227 c2 = u1(x >> 16);
1228 c3 = u1(x >> 8);
1229 c4 = u1(x);
1230 }
1231
1232 inline void explode_int_to( u4 x, u1* p ) {
1233 explode_int_to( x, p[0], p[1], p[2], p[3]);
1234 }
1235
1236
1237 // Pack and extract shorts to/from ints:
1238
1239 inline int extract_low_short_from_int(jint x) {
1240 return x & 0xffff;
1241 }
1242
1243 inline int extract_high_short_from_int(jint x) {
1244 return (x >> 16) & 0xffff;
1245 }
1246
1247 inline int build_int_from_shorts( jushort low, jushort high ) {
1248 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1249 }
1250
1251 // Convert pointer to intptr_t, for use in printing pointers.
1252 inline intptr_t p2i(const void * p) {
1253 return (intptr_t) p;
1254 }
1255
1256 // swap a & b
1257 template<class T> static void swap(T& a, T& b) {
1258 T tmp = a;
1259 a = b;
1260 b = tmp;
1261 }
1262
1263 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1264
1265 //----------------------------------------------------------------------------------------------------
1266 // Sum and product which can never overflow: they wrap, just like the
1267 // Java operations. Note that we don't intend these to be used for
1268 // general-purpose arithmetic: their purpose is to emulate Java
1269 // operations.
1270
1271 // The goal of this code to avoid undefined or implementation-defined
1272 // behavior. The use of an lvalue to reference cast is explicitly
1273 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1274 // 15 in C++03]
1275 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1276 inline TYPE NAME (TYPE in1, TYPE in2) { \
1277 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1278 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1279 return reinterpret_cast<TYPE&>(ures); \
1280 }
1281
1282 JAVA_INTEGER_OP(+, java_add, jint, juint)
1283 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1284 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1285 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1286 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1287 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1288
1289 #undef JAVA_INTEGER_OP
1290
1291 // Dereference vptr
1292 // All C++ compilers that we know of have the vtbl pointer in the first
1293 // word. If there are exceptions, this function needs to be made compiler
1294 // specific.
1295 static inline void* dereference_vptr(const void* addr) {
1296 return *(void**)addr;
1297 }
1298
1299 //----------------------------------------------------------------------------------------------------
1300 // String type aliases used by command line flag declarations and
1301 // processing utilities.
1302
1303 typedef const char* ccstr;
1304 typedef const char* ccstrlist; // represents string arguments which accumulate
1305
1306 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP