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 #define UINT64_FORMAT_X_W(width) "%" #width PRIx64
73
74 #define PTR64_FORMAT "0x%016" PRIx64
75
76 // Format jlong, if necessary
77 #ifndef JLONG_FORMAT
78 #define JLONG_FORMAT INT64_FORMAT
79 #endif
80 #ifndef JULONG_FORMAT
81 #define JULONG_FORMAT UINT64_FORMAT
82 #endif
83 #ifndef JULONG_FORMAT_X
84 #define JULONG_FORMAT_X UINT64_FORMAT_X
85 #endif
86
87 // Format pointers which change size between 32- and 64-bit.
88 #ifdef _LP64
89 #define INTPTR_FORMAT "0x%016" PRIxPTR
90 #define PTR_FORMAT "0x%016" PRIxPTR
91 #else // !_LP64
92 #define INTPTR_FORMAT "0x%08" PRIxPTR
93 #define PTR_FORMAT "0x%08" PRIxPTR
94 #endif // _LP64
95
96 // Format pointers without leading zeros
97 #define INTPTRNZ_FORMAT "0x%" PRIxPTR
98
99 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR
100
101 #define SSIZE_FORMAT "%" PRIdPTR
102 #define SIZE_FORMAT "%" PRIuPTR
103 #define SIZE_FORMAT_HEX "0x%" PRIxPTR
104 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
105 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR
106 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR
107
108 #define INTX_FORMAT "%" PRIdPTR
109 #define UINTX_FORMAT "%" PRIuPTR
110 #define INTX_FORMAT_W(width) "%" #width PRIdPTR
111 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
112
113 //----------------------------------------------------------------------------------------------------
114 // Constants
115
116 const int LogBytesPerShort = 1;
117 const int LogBytesPerInt = 2;
118 #ifdef _LP64
119 const int LogBytesPerWord = 3;
120 #else
121 const int LogBytesPerWord = 2;
122 #endif
123 const int LogBytesPerLong = 3;
124
125 const int BytesPerShort = 1 << LogBytesPerShort;
126 const int BytesPerInt = 1 << LogBytesPerInt;
127 const int BytesPerWord = 1 << LogBytesPerWord;
128 const int BytesPerLong = 1 << LogBytesPerLong;
129
130 const int LogBitsPerByte = 3;
131 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort;
132 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt;
133 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord;
134 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong;
135
136 const int BitsPerByte = 1 << LogBitsPerByte;
137 const int BitsPerShort = 1 << LogBitsPerShort;
138 const int BitsPerInt = 1 << LogBitsPerInt;
139 const int BitsPerWord = 1 << LogBitsPerWord;
140 const int BitsPerLong = 1 << LogBitsPerLong;
141
142 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1;
143 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1;
144
145 const int WordsPerLong = 2; // Number of stack entries for longs
146
147 const int oopSize = sizeof(char*); // Full-width oop
148 extern int heapOopSize; // Oop within a java object
149 const int wordSize = sizeof(char*);
150 const int longSize = sizeof(jlong);
151 const int jintSize = sizeof(jint);
152 const int size_tSize = sizeof(size_t);
153
154 const int BytesPerOop = BytesPerWord; // Full-width oop
155
156 extern int LogBytesPerHeapOop; // Oop within a java object
157 extern int LogBitsPerHeapOop;
158 extern int BytesPerHeapOop;
159 extern int BitsPerHeapOop;
160
161 const int BitsPerJavaInteger = 32;
162 const int BitsPerJavaLong = 64;
163 const int BitsPerSize_t = size_tSize * BitsPerByte;
164
165 // Size of a char[] needed to represent a jint as a string in decimal.
166 const int jintAsStringSize = 12;
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 minimum number of native machine words necessary to contain "byte_size"
203 // bytes.
204 inline size_t heap_word_size(size_t byte_size) {
205 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
206 }
207
208 //-------------------------------------------
209 // Constant for jlong (standardized by C++11)
210
211 // Build a 64bit integer constant
212 #define CONST64(x) (x ## LL)
213 #define UCONST64(x) (x ## ULL)
214
215 const jlong min_jlong = CONST64(0x8000000000000000);
216 const jlong max_jlong = CONST64(0x7fffffffffffffff);
217
218 const size_t K = 1024;
219 const size_t M = K*K;
220 const size_t G = M*K;
221 const size_t HWperKB = K / sizeof(HeapWord);
222
223 // Constants for converting from a base unit to milli-base units. For
224 // example from seconds to milliseconds and microseconds
225
226 const int MILLIUNITS = 1000; // milli units per base unit
227 const int MICROUNITS = 1000000; // micro units per base unit
228 const int NANOUNITS = 1000000000; // nano units per base unit
229
230 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
231 const jint NANOSECS_PER_MILLISEC = 1000000;
232
233 inline const char* proper_unit_for_byte_size(size_t s) {
234 #ifdef _LP64
235 if (s >= 10*G) {
236 return "G";
237 }
238 #endif
239 if (s >= 10*M) {
240 return "M";
241 } else if (s >= 10*K) {
242 return "K";
243 } else {
244 return "B";
245 }
246 }
247
248 template <class T>
249 inline T byte_size_in_proper_unit(T s) {
250 #ifdef _LP64
251 if (s >= 10*G) {
252 return (T)(s/G);
253 }
254 #endif
255 if (s >= 10*M) {
256 return (T)(s/M);
257 } else if (s >= 10*K) {
258 return (T)(s/K);
259 } else {
260 return s;
261 }
262 }
263
264 inline const char* exact_unit_for_byte_size(size_t s) {
265 #ifdef _LP64
266 if (s >= G && (s % G) == 0) {
267 return "G";
268 }
269 #endif
270 if (s >= M && (s % M) == 0) {
271 return "M";
272 }
273 if (s >= K && (s % K) == 0) {
274 return "K";
275 }
276 return "B";
277 }
278
279 inline size_t byte_size_in_exact_unit(size_t s) {
280 #ifdef _LP64
281 if (s >= G && (s % G) == 0) {
282 return s / G;
283 }
284 #endif
285 if (s >= M && (s % M) == 0) {
286 return s / M;
287 }
288 if (s >= K && (s % K) == 0) {
289 return s / K;
290 }
291 return s;
292 }
293
294 //----------------------------------------------------------------------------------------------------
295 // VM type definitions
296
297 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
298 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
299
300 typedef intptr_t intx;
301 typedef uintptr_t uintx;
302
303 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
304 const intx max_intx = (uintx)min_intx - 1;
305 const uintx max_uintx = (uintx)-1;
306
307 // Table of values:
308 // sizeof intx 4 8
309 // min_intx 0x80000000 0x8000000000000000
310 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
311 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
312
313 typedef unsigned int uint; NEEDS_CLEANUP
314
315
316 //----------------------------------------------------------------------------------------------------
317 // Java type definitions
318
319 // All kinds of 'plain' byte addresses
320 typedef signed char s_char;
321 typedef unsigned char u_char;
322 typedef u_char* address;
323 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
324 // except for some implementations of a C++
325 // linkage pointer to function. Should never
326 // need one of those to be placed in this
327 // type anyway.
328
329 // Utility functions to "portably" (?) bit twiddle pointers
330 // Where portable means keep ANSI C++ compilers quiet
331
332 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
333 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
334
335 // Utility functions to "portably" make cast to/from function pointers.
336
337 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
338 inline address_word castable_address(address x) { return address_word(x) ; }
339 inline address_word castable_address(void* x) { return address_word(x) ; }
340
341 // Pointer subtraction.
342 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
343 // the range we might need to find differences from one end of the heap
344 // to the other.
345 // A typical use might be:
346 // if (pointer_delta(end(), top()) >= size) {
347 // // enough room for an object of size
348 // ...
349 // and then additions like
350 // ... top() + size ...
351 // are safe because we know that top() is at least size below end().
352 inline size_t pointer_delta(const volatile void* left,
353 const volatile void* right,
354 size_t element_size) {
355 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
356 }
357
358 // A version specialized for HeapWord*'s.
359 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
360 return pointer_delta(left, right, sizeof(HeapWord));
361 }
362 // A version specialized for MetaWord*'s.
363 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
364 return pointer_delta(left, right, sizeof(MetaWord));
365 }
366
367 //
368 // ANSI C++ does not allow casting from one pointer type to a function pointer
369 // directly without at best a warning. This macro accomplishes it silently
370 // In every case that is present at this point the value be cast is a pointer
371 // to a C linkage function. In some case the type used for the cast reflects
372 // that linkage and a picky compiler would not complain. In other cases because
373 // there is no convenient place to place a typedef with extern C linkage (i.e
374 // a platform dependent header file) it doesn't. At this point no compiler seems
375 // picky enough to catch these instances (which are few). It is possible that
376 // using templates could fix these for all cases. This use of templates is likely
377 // so far from the middle of the road that it is likely to be problematic in
378 // many C++ compilers.
379 //
380 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
381 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
382
383 // Unsigned byte types for os and stream.hpp
384
385 // Unsigned one, two, four and eigth byte quantities used for describing
386 // the .class file format. See JVM book chapter 4.
387
388 typedef jubyte u1;
389 typedef jushort u2;
390 typedef juint u4;
391 typedef julong u8;
392
393 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
394 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
395 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
396 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
397
398 typedef jbyte s1;
399 typedef jshort s2;
400 typedef jint s4;
401 typedef jlong s8;
402
403 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
404 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
405 const jshort min_jshort = -(1 << 15); // smallest jshort
406 const jshort max_jshort = (1 << 15) - 1; // largest jshort
407
408 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
409 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
410
411 //----------------------------------------------------------------------------------------------------
412 // JVM spec restrictions
413
414 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
415
416 //----------------------------------------------------------------------------------------------------
417 // Default and minimum StringTable and SymbolTable size values
418 // Must be a power of 2
419
420 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
421 const size_t minimumStringTableSize = 128;
422
423 const size_t defaultSymbolTableSize = 32768; // 2^15
424 const size_t minimumSymbolTableSize = 1024;
425
426
427 //----------------------------------------------------------------------------------------------------
428 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
429 //
430 // Determines whether on-the-fly class replacement and frame popping are enabled.
431
432 #define HOTSWAP
433
434 //----------------------------------------------------------------------------------------------------
435 // Object alignment, in units of HeapWords.
436 //
437 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
438 // reference fields can be naturally aligned.
439
440 extern int MinObjAlignment;
441 extern int MinObjAlignmentInBytes;
442 extern int MinObjAlignmentInBytesMask;
443
444 extern int LogMinObjAlignment;
445 extern int LogMinObjAlignmentInBytes;
446
447 const int LogKlassAlignmentInBytes = 3;
448 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
449 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
450 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
451
452 // Maximal size of heap where unscaled compression can be used. Also upper bound
453 // for heap placement: 4GB.
454 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
455 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
456 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
457 extern uint64_t OopEncodingHeapMax;
458
459 // Maximal size of compressed class space. Above this limit compression is not possible.
460 // Also upper bound for placement of zero based class space. (Class space is further limited
461 // to be < 3G, see arguments.cpp.)
462 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
463
464 // Machine dependent stuff
465
466 // The maximum size of the code cache. Can be overridden by targets.
467 #define CODE_CACHE_SIZE_LIMIT (2*G)
468 // Allow targets to reduce the default size of the code cache.
469 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
470
471 #include CPU_HEADER(globalDefinitions)
472
473 // To assure the IRIW property on processors that are not multiple copy
474 // atomic, sync instructions must be issued between volatile reads to
475 // assure their ordering, instead of after volatile stores.
476 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
477 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
478 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
479 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
480 #else
481 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
482 #endif
483
484 // The expected size in bytes of a cache line, used to pad data structures.
485 #ifndef DEFAULT_CACHE_LINE_SIZE
486 #define DEFAULT_CACHE_LINE_SIZE 64
487 #endif
488
489
490 //----------------------------------------------------------------------------------------------------
491 // Utility macros for compilers
492 // used to silence compiler warnings
493
494 #define Unused_Variable(var) var
495
496
497 //----------------------------------------------------------------------------------------------------
498 // Miscellaneous
499
500 // 6302670 Eliminate Hotspot __fabsf dependency
501 // All fabs() callers should call this function instead, which will implicitly
502 // convert the operand to double, avoiding a dependency on __fabsf which
503 // doesn't exist in early versions of Solaris 8.
504 inline double fabsd(double value) {
505 return fabs(value);
506 }
507
508 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
509 // is zero, return 0.0.
510 template<typename T>
511 inline double percent_of(T numerator, T denominator) {
512 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
513 }
514
515 //----------------------------------------------------------------------------------------------------
516 // Special casts
517 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
518 typedef union {
519 jfloat f;
520 jint i;
521 } FloatIntConv;
522
523 typedef union {
524 jdouble d;
525 jlong l;
526 julong ul;
527 } DoubleLongConv;
528
529 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
530 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
531
532 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
533 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
534 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
535
536 inline jint low (jlong value) { return jint(value); }
537 inline jint high(jlong value) { return jint(value >> 32); }
538
539 // the fancy casts are a hopefully portable way
540 // to do unsigned 32 to 64 bit type conversion
541 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
542 *value |= (jlong)(julong)(juint)low; }
543
544 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
545 *value |= (jlong)high << 32; }
546
547 inline jlong jlong_from(jint h, jint l) {
548 jlong result = 0; // initialization to avoid warning
549 set_high(&result, h);
550 set_low(&result, l);
551 return result;
552 }
553
554 union jlong_accessor {
555 jint words[2];
556 jlong long_value;
557 };
558
559 void basic_types_init(); // cannot define here; uses assert
560
561
562 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
563 enum BasicType {
564 T_BOOLEAN = 4,
565 T_CHAR = 5,
566 T_FLOAT = 6,
567 T_DOUBLE = 7,
568 T_BYTE = 8,
569 T_SHORT = 9,
570 T_INT = 10,
571 T_LONG = 11,
572 T_OBJECT = 12,
573 T_ARRAY = 13,
574 T_VOID = 14,
575 T_ADDRESS = 15,
576 T_NARROWOOP = 16,
577 T_METADATA = 17,
578 T_NARROWKLASS = 18,
579 T_CONFLICT = 19, // for stack value type with conflicting contents
580 T_ILLEGAL = 99
581 };
582
583 inline bool is_java_primitive(BasicType t) {
584 return T_BOOLEAN <= t && t <= T_LONG;
585 }
586
587 inline bool is_subword_type(BasicType t) {
588 // these guys are processed exactly like T_INT in calling sequences:
589 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
590 }
591
592 inline bool is_signed_subword_type(BasicType t) {
593 return (t == T_BYTE || t == T_SHORT);
594 }
595
596 inline bool is_reference_type(BasicType t) {
597 return (t == T_OBJECT || t == T_ARRAY);
598 }
599
600 // Convert a char from a classfile signature to a BasicType
601 inline BasicType char2type(char c) {
602 switch( c ) {
603 case 'B': return T_BYTE;
604 case 'C': return T_CHAR;
605 case 'D': return T_DOUBLE;
606 case 'F': return T_FLOAT;
607 case 'I': return T_INT;
608 case 'J': return T_LONG;
609 case 'S': return T_SHORT;
610 case 'Z': return T_BOOLEAN;
611 case 'V': return T_VOID;
612 case 'L': return T_OBJECT;
613 case '[': return T_ARRAY;
614 }
615 return T_ILLEGAL;
616 }
617
618 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
619 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
620 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
621 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
622 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
623 extern BasicType name2type(const char* name);
624
625 // Auxiliary math routines
626 // least common multiple
627 extern size_t lcm(size_t a, size_t b);
628
629
630 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
631 enum BasicTypeSize {
632 T_BOOLEAN_size = 1,
633 T_CHAR_size = 1,
634 T_FLOAT_size = 1,
635 T_DOUBLE_size = 2,
636 T_BYTE_size = 1,
637 T_SHORT_size = 1,
638 T_INT_size = 1,
639 T_LONG_size = 2,
640 T_OBJECT_size = 1,
641 T_ARRAY_size = 1,
642 T_NARROWOOP_size = 1,
643 T_NARROWKLASS_size = 1,
644 T_VOID_size = 0
645 };
646
647
648 // maps a BasicType to its instance field storage type:
649 // all sub-word integral types are widened to T_INT
650 extern BasicType type2field[T_CONFLICT+1];
651 extern BasicType type2wfield[T_CONFLICT+1];
652
653
654 // size in bytes
655 enum ArrayElementSize {
656 T_BOOLEAN_aelem_bytes = 1,
657 T_CHAR_aelem_bytes = 2,
658 T_FLOAT_aelem_bytes = 4,
659 T_DOUBLE_aelem_bytes = 8,
660 T_BYTE_aelem_bytes = 1,
661 T_SHORT_aelem_bytes = 2,
662 T_INT_aelem_bytes = 4,
663 T_LONG_aelem_bytes = 8,
664 #ifdef _LP64
665 T_OBJECT_aelem_bytes = 8,
666 T_ARRAY_aelem_bytes = 8,
667 #else
668 T_OBJECT_aelem_bytes = 4,
669 T_ARRAY_aelem_bytes = 4,
670 #endif
671 T_NARROWOOP_aelem_bytes = 4,
672 T_NARROWKLASS_aelem_bytes = 4,
673 T_VOID_aelem_bytes = 0
674 };
675
676 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
677 #ifdef ASSERT
678 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
679 #else
680 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
681 #endif
682
683
684 // JavaValue serves as a container for arbitrary Java values.
685
686 class JavaValue {
687
688 public:
689 typedef union JavaCallValue {
690 jfloat f;
691 jdouble d;
692 jint i;
693 jlong l;
694 jobject h;
695 } JavaCallValue;
696
697 private:
698 BasicType _type;
699 JavaCallValue _value;
700
701 public:
702 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
703
704 JavaValue(jfloat value) {
705 _type = T_FLOAT;
706 _value.f = value;
707 }
708
709 JavaValue(jdouble value) {
710 _type = T_DOUBLE;
711 _value.d = value;
712 }
713
714 jfloat get_jfloat() const { return _value.f; }
715 jdouble get_jdouble() const { return _value.d; }
716 jint get_jint() const { return _value.i; }
717 jlong get_jlong() const { return _value.l; }
718 jobject get_jobject() const { return _value.h; }
719 JavaCallValue* get_value_addr() { return &_value; }
720 BasicType get_type() const { return _type; }
721
722 void set_jfloat(jfloat f) { _value.f = f;}
723 void set_jdouble(jdouble d) { _value.d = d;}
724 void set_jint(jint i) { _value.i = i;}
725 void set_jlong(jlong l) { _value.l = l;}
726 void set_jobject(jobject h) { _value.h = h;}
727 void set_type(BasicType t) { _type = t; }
728
729 jboolean get_jboolean() const { return (jboolean) (_value.i);}
730 jbyte get_jbyte() const { return (jbyte) (_value.i);}
731 jchar get_jchar() const { return (jchar) (_value.i);}
732 jshort get_jshort() const { return (jshort) (_value.i);}
733
734 };
735
736
737 #define STACK_BIAS 0
738 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
739 // in order to extend the reach of the stack pointer.
740 #if defined(SPARC) && defined(_LP64)
741 #undef STACK_BIAS
742 #define STACK_BIAS 0x7ff
743 #endif
744
745
746 // TosState describes the top-of-stack state before and after the execution of
747 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
748 // registers. The TosState corresponds to the 'machine representation' of this cached
749 // value. There's 4 states corresponding to the JAVA types int, long, float & double
750 // as well as a 5th state in case the top-of-stack value is actually on the top
751 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
752 // state when it comes to machine representation but is used separately for (oop)
753 // type specific operations (e.g. verification code).
754
755 enum TosState { // describes the tos cache contents
756 btos = 0, // byte, bool tos cached
757 ztos = 1, // byte, bool tos cached
758 ctos = 2, // char tos cached
759 stos = 3, // short tos cached
760 itos = 4, // int tos cached
761 ltos = 5, // long tos cached
762 ftos = 6, // float tos cached
763 dtos = 7, // double tos cached
764 atos = 8, // object cached
765 vtos = 9, // tos not cached
766 number_of_states,
767 ilgl // illegal state: should not occur
768 };
769
770
771 inline TosState as_TosState(BasicType type) {
772 switch (type) {
773 case T_BYTE : return btos;
774 case T_BOOLEAN: return ztos;
775 case T_CHAR : return ctos;
776 case T_SHORT : return stos;
777 case T_INT : return itos;
778 case T_LONG : return ltos;
779 case T_FLOAT : return ftos;
780 case T_DOUBLE : return dtos;
781 case T_VOID : return vtos;
782 case T_ARRAY : // fall through
783 case T_OBJECT : return atos;
784 default : return ilgl;
785 }
786 }
787
788 inline BasicType as_BasicType(TosState state) {
789 switch (state) {
790 case btos : return T_BYTE;
791 case ztos : return T_BOOLEAN;
792 case ctos : return T_CHAR;
793 case stos : return T_SHORT;
794 case itos : return T_INT;
795 case ltos : return T_LONG;
796 case ftos : return T_FLOAT;
797 case dtos : return T_DOUBLE;
798 case atos : return T_OBJECT;
799 case vtos : return T_VOID;
800 default : return T_ILLEGAL;
801 }
802 }
803
804
805 // Helper function to convert BasicType info into TosState
806 // Note: Cannot define here as it uses global constant at the time being.
807 TosState as_TosState(BasicType type);
808
809
810 // JavaThreadState keeps track of which part of the code a thread is executing in. This
811 // information is needed by the safepoint code.
812 //
813 // There are 4 essential states:
814 //
815 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
816 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
817 // _thread_in_vm : Executing in the vm
818 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
819 //
820 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
821 // a transition from one state to another. These extra states makes it possible for the safepoint code to
822 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
823 //
824 // Given a state, the xxxx_trans state can always be found by adding 1.
825 //
826 enum JavaThreadState {
827 _thread_uninitialized = 0, // should never happen (missing initialization)
828 _thread_new = 2, // just starting up, i.e., in process of being initialized
829 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
830 _thread_in_native = 4, // running in native code
831 _thread_in_native_trans = 5, // corresponding transition state
832 _thread_in_vm = 6, // running in VM
833 _thread_in_vm_trans = 7, // corresponding transition state
834 _thread_in_Java = 8, // running in Java or in stub code
835 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
836 _thread_blocked = 10, // blocked in vm
837 _thread_blocked_trans = 11, // corresponding transition state
838 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
839 };
840
841
842
843 //----------------------------------------------------------------------------------------------------
844 // 'Forward' declarations of frequently used classes
845 // (in order to reduce interface dependencies & reduce
846 // number of unnecessary compilations after changes)
847
848 class ClassFileStream;
849
850 class Event;
851
852 class Thread;
853 class VMThread;
854 class JavaThread;
855 class Threads;
856
857 class VM_Operation;
858 class VMOperationQueue;
859
860 class CodeBlob;
861 class CompiledMethod;
862 class nmethod;
863 class RuntimeBlob;
864 class OSRAdapter;
865 class I2CAdapter;
866 class C2IAdapter;
867 class CompiledIC;
868 class relocInfo;
869 class ScopeDesc;
870 class PcDesc;
871
872 class Recompiler;
873 class Recompilee;
874 class RecompilationPolicy;
875 class RFrame;
876 class CompiledRFrame;
877 class InterpretedRFrame;
878
879 class vframe;
880 class javaVFrame;
881 class interpretedVFrame;
882 class compiledVFrame;
883 class deoptimizedVFrame;
884 class externalVFrame;
885 class entryVFrame;
886
887 class RegisterMap;
888
889 class Mutex;
890 class Monitor;
891 class BasicLock;
892 class BasicObjectLock;
893
894 class PeriodicTask;
895
896 class JavaCallWrapper;
897
898 class oopDesc;
899 class metaDataOopDesc;
900
901 class NativeCall;
902
903 class zone;
904
905 class StubQueue;
906
907 class outputStream;
908
909 class ResourceArea;
910
911 class DebugInformationRecorder;
912 class ScopeValue;
913 class CompressedStream;
914 class DebugInfoReadStream;
915 class DebugInfoWriteStream;
916 class LocationValue;
917 class ConstantValue;
918 class IllegalValue;
919
920 class MonitorArray;
921
922 class MonitorInfo;
923
924 class OffsetClosure;
925 class OopMapCache;
926 class InterpreterOopMap;
927 class OopMapCacheEntry;
928 class OSThread;
929
930 typedef int (*OSThreadStartFunc)(void*);
931
932 class Space;
933
934 class JavaValue;
935 class methodHandle;
936 class JavaCallArguments;
937
938 //----------------------------------------------------------------------------------------------------
939 // Special constants for debugging
940
941 const jint badInt = -3; // generic "bad int" value
942 const intptr_t badAddressVal = -2; // generic "bad address" value
943 const intptr_t badOopVal = -1; // generic "bad oop" value
944 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
945 const int badStackSegVal = 0xCA; // value used to zap stack segments
946 const int badHandleValue = 0xBC; // value used to zap vm handle area
947 const int badResourceValue = 0xAB; // value used to zap resource area
948 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
949 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
950 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
951 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
952 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
953 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
954 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
955
956
957 // (These must be implemented as #defines because C++ compilers are
958 // not obligated to inline non-integral constants!)
959 #define badAddress ((address)::badAddressVal)
960 #define badOop (cast_to_oop(::badOopVal))
961 #define badHeapWord (::badHeapWordVal)
962
963 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
964 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
965
966 //----------------------------------------------------------------------------------------------------
967 // Utility functions for bitfield manipulations
968
969 const intptr_t AllBits = ~0; // all bits set in a word
970 const intptr_t NoBits = 0; // no bits set in a word
971 const jlong NoLongBits = 0; // no bits set in a long
972 const intptr_t OneBit = 1; // only right_most bit set in a word
973
974 // get a word with the n.th or the right-most or left-most n bits set
975 // (note: #define used only so that they can be used in enum constant definitions)
976 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
977 #define right_n_bits(n) (nth_bit(n) - 1)
978 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
979
980 // bit-operations using a mask m
981 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
982 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
983 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
984 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
985 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
986
987 // bit-operations using the n.th bit
988 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
989 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
990 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
991
992 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
993 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
994 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
995 }
996
997
998 //----------------------------------------------------------------------------------------------------
999 // Utility functions for integers
1000
1001 // Avoid use of global min/max macros which may cause unwanted double
1002 // evaluation of arguments.
1003 #ifdef max
1004 #undef max
1005 #endif
1006
1007 #ifdef min
1008 #undef min
1009 #endif
1010
1011 // It is necessary to use templates here. Having normal overloaded
1012 // functions does not work because it is necessary to provide both 32-
1013 // and 64-bit overloaded functions, which does not work, and having
1014 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1015 // will be even more error-prone than macros.
1016 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1017 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1018 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1019 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1020 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1021 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1022
1023 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1024
1025 // true if x is a power of 2, false otherwise
1026 inline bool is_power_of_2(intptr_t x) {
1027 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1028 }
1029
1030 // long version of is_power_of_2
1031 inline bool is_power_of_2_long(jlong x) {
1032 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1033 }
1034
1035 // Returns largest i such that 2^i <= x.
1036 // If x == 0, the function returns -1.
1037 inline int log2_intptr(uintptr_t x) {
1038 int i = -1;
1039 uintptr_t p = 1;
1040 while (p != 0 && p <= x) {
1041 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1042 i++; p *= 2;
1043 }
1044 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1045 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1046 return i;
1047 }
1048
1049 //* largest i such that 2^i <= x
1050 inline int log2_long(julong x) {
1051 int i = -1;
1052 julong p = 1;
1053 while (p != 0 && p <= x) {
1054 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1055 i++; p *= 2;
1056 }
1057 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1058 // (if p = 0 then overflow occurred and i = 63)
1059 return i;
1060 }
1061
1062 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1063 inline int log2_intptr(intptr_t x) {
1064 return log2_intptr((uintptr_t)x);
1065 }
1066
1067 inline int log2_int(int x) {
1068 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
1069 return log2_intptr((uintptr_t)x);
1070 }
1071
1072 inline int log2_jint(jint x) {
1073 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1074 return log2_intptr((uintptr_t)x);
1075 }
1076
1077 inline int log2_uint(uint x) {
1078 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1079 return log2_intptr((uintptr_t)x);
1080 }
1081
1082 // A negative value of 'x' will return '63'
1083 inline int log2_jlong(jlong x) {
1084 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1085 return log2_long((julong)x);
1086 }
1087
1088 //* the argument must be exactly a power of 2
1089 inline int exact_log2(intptr_t x) {
1090 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1091 return log2_intptr(x);
1092 }
1093
1094 //* the argument must be exactly a power of 2
1095 inline int exact_log2_long(jlong x) {
1096 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1097 return log2_long(x);
1098 }
1099
1100 inline bool is_odd (intx x) { return x & 1; }
1101 inline bool is_even(intx x) { return !is_odd(x); }
1102
1103 // abs methods which cannot overflow and so are well-defined across
1104 // the entire domain of integer types.
1105 static inline unsigned int uabs(unsigned int n) {
1106 union {
1107 unsigned int result;
1108 int value;
1109 };
1110 result = n;
1111 if (value < 0) result = 0-result;
1112 return result;
1113 }
1114 static inline julong uabs(julong n) {
1115 union {
1116 julong result;
1117 jlong value;
1118 };
1119 result = n;
1120 if (value < 0) result = 0-result;
1121 return result;
1122 }
1123 static inline julong uabs(jlong n) { return uabs((julong)n); }
1124 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1125
1126 // "to" should be greater than "from."
1127 inline intx byte_size(void* from, void* to) {
1128 return (address)to - (address)from;
1129 }
1130
1131 //----------------------------------------------------------------------------------------------------
1132 // Avoid non-portable casts with these routines (DEPRECATED)
1133
1134 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1135 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1136
1137 // Given sequence of four bytes, build into a 32-bit word
1138 // following the conventions used in class files.
1139 // On the 386, this could be realized with a simple address cast.
1140 //
1141
1142 // This routine takes eight bytes:
1143 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1144 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1145 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1146 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1147 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1148 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1149 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1150 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1151 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1152 }
1153
1154 // This routine takes four bytes:
1155 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1156 return (( u4(c1) << 24 ) & 0xff000000)
1157 | (( u4(c2) << 16 ) & 0x00ff0000)
1158 | (( u4(c3) << 8 ) & 0x0000ff00)
1159 | (( u4(c4) << 0 ) & 0x000000ff);
1160 }
1161
1162 // And this one works if the four bytes are contiguous in memory:
1163 inline u4 build_u4_from( u1* p ) {
1164 return build_u4_from( p[0], p[1], p[2], p[3] );
1165 }
1166
1167 // Ditto for two-byte ints:
1168 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1169 return u2((( u2(c1) << 8 ) & 0xff00)
1170 | (( u2(c2) << 0 ) & 0x00ff));
1171 }
1172
1173 // And this one works if the two bytes are contiguous in memory:
1174 inline u2 build_u2_from( u1* p ) {
1175 return build_u2_from( p[0], p[1] );
1176 }
1177
1178 // Ditto for floats:
1179 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1180 u4 u = build_u4_from( c1, c2, c3, c4 );
1181 return *(jfloat*)&u;
1182 }
1183
1184 inline jfloat build_float_from( u1* p ) {
1185 u4 u = build_u4_from( p );
1186 return *(jfloat*)&u;
1187 }
1188
1189
1190 // now (64-bit) longs
1191
1192 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1193 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1194 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1195 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1196 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1197 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1198 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1199 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1200 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1201 }
1202
1203 inline jlong build_long_from( u1* p ) {
1204 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1205 }
1206
1207
1208 // Doubles, too!
1209 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1210 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1211 return *(jdouble*)&u;
1212 }
1213
1214 inline jdouble build_double_from( u1* p ) {
1215 jlong u = build_long_from( p );
1216 return *(jdouble*)&u;
1217 }
1218
1219
1220 // Portable routines to go the other way:
1221
1222 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1223 c1 = u1(x >> 8);
1224 c2 = u1(x);
1225 }
1226
1227 inline void explode_short_to( u2 x, u1* p ) {
1228 explode_short_to( x, p[0], p[1]);
1229 }
1230
1231 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1232 c1 = u1(x >> 24);
1233 c2 = u1(x >> 16);
1234 c3 = u1(x >> 8);
1235 c4 = u1(x);
1236 }
1237
1238 inline void explode_int_to( u4 x, u1* p ) {
1239 explode_int_to( x, p[0], p[1], p[2], p[3]);
1240 }
1241
1242
1243 // Pack and extract shorts to/from ints:
1244
1245 inline int extract_low_short_from_int(jint x) {
1246 return x & 0xffff;
1247 }
1248
1249 inline int extract_high_short_from_int(jint x) {
1250 return (x >> 16) & 0xffff;
1251 }
1252
1253 inline int build_int_from_shorts( jushort low, jushort high ) {
1254 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1255 }
1256
1257 // Convert pointer to intptr_t, for use in printing pointers.
1258 inline intptr_t p2i(const void * p) {
1259 return (intptr_t) p;
1260 }
1261
1262 // swap a & b
1263 template<class T> static void swap(T& a, T& b) {
1264 T tmp = a;
1265 a = b;
1266 b = tmp;
1267 }
1268
1269 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1270
1271 //----------------------------------------------------------------------------------------------------
1272 // Sum and product which can never overflow: they wrap, just like the
1273 // Java operations. Note that we don't intend these to be used for
1274 // general-purpose arithmetic: their purpose is to emulate Java
1275 // operations.
1276
1277 // The goal of this code to avoid undefined or implementation-defined
1278 // behavior. The use of an lvalue to reference cast is explicitly
1279 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1280 // 15 in C++03]
1281 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1282 inline TYPE NAME (TYPE in1, TYPE in2) { \
1283 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1284 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1285 return reinterpret_cast<TYPE&>(ures); \
1286 }
1287
1288 JAVA_INTEGER_OP(+, java_add, jint, juint)
1289 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1290 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1291 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1292 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1293 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1294
1295 #undef JAVA_INTEGER_OP
1296
1297 // Dereference vptr
1298 // All C++ compilers that we know of have the vtbl pointer in the first
1299 // word. If there are exceptions, this function needs to be made compiler
1300 // specific.
1301 static inline void* dereference_vptr(const void* addr) {
1302 return *(void**)addr;
1303 }
1304
1305 //----------------------------------------------------------------------------------------------------
1306 // String type aliases used by command line flag declarations and
1307 // processing utilities.
1308
1309 typedef const char* ccstr;
1310 typedef const char* ccstrlist; // represents string arguments which accumulate
1311
1312 //----------------------------------------------------------------------------------------------------
1313 // Default hash/equals functions used by ResourceHashtable and KVHashtable
1314
1315 template<typename K> unsigned primitive_hash(const K& k) {
1316 unsigned hash = (unsigned)((uintptr_t)k);
1317 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs
1318 }
1319
1320 template<typename K> bool primitive_equals(const K& k0, const K& k1) {
1321 return k0 == k1;
1322 }
1323
1324
1325 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP