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 // In fact this should be
169 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
170 // see os::set_memory_serialize_page()
171 #ifdef _LP64
172 const int SerializePageShiftCount = 4;
173 #else
174 const int SerializePageShiftCount = 3;
175 #endif
176
177 // An opaque struct of heap-word width, so that HeapWord* can be a generic
178 // pointer into the heap. We require that object sizes be measured in
179 // units of heap words, so that that
180 // HeapWord* hw;
181 // hw += oop(hw)->foo();
182 // works, where foo is a method (like size or scavenge) that returns the
183 // object size.
184 class HeapWord {
185 friend class VMStructs;
186 private:
187 char* i;
188 #ifndef PRODUCT
189 public:
190 char* value() { return i; }
191 #endif
192 };
193
194 // Analogous opaque struct for metadata allocated from
195 // metaspaces.
196 class MetaWord {
197 private:
198 char* i;
199 };
200
201 // HeapWordSize must be 2^LogHeapWordSize.
202 const int HeapWordSize = sizeof(HeapWord);
203 #ifdef _LP64
204 const int LogHeapWordSize = 3;
205 #else
206 const int LogHeapWordSize = 2;
207 #endif
208 const int HeapWordsPerLong = BytesPerLong / HeapWordSize;
209 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
210
211 // The minimum number of native machine words necessary to contain "byte_size"
212 // bytes.
213 inline size_t heap_word_size(size_t byte_size) {
214 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
215 }
216
217 //-------------------------------------------
218 // Constant for jlong (standardized by C++11)
219
220 // Build a 64bit integer constant
221 #define CONST64(x) (x ## LL)
222 #define UCONST64(x) (x ## ULL)
223
224 const jlong min_jlong = CONST64(0x8000000000000000);
225 const jlong max_jlong = CONST64(0x7fffffffffffffff);
226
227 const size_t K = 1024;
228 const size_t M = K*K;
229 const size_t G = M*K;
230 const size_t HWperKB = K / sizeof(HeapWord);
231
232 // Constants for converting from a base unit to milli-base units. For
233 // example from seconds to milliseconds and microseconds
234
235 const int MILLIUNITS = 1000; // milli units per base unit
236 const int MICROUNITS = 1000000; // micro units per base unit
237 const int NANOUNITS = 1000000000; // nano units per base unit
238
239 const jlong NANOSECS_PER_SEC = CONST64(1000000000);
240 const jint NANOSECS_PER_MILLISEC = 1000000;
241
242 // Proper units routines try to maintain at least three significant digits.
243 // In worst case, it would print five significant digits with lower prefix.
244 // G is close to MAX_SIZE on 32-bit platforms, so its product can easily overflow,
245 // and therefore we need to be careful.
246
247 inline const char* proper_unit_for_byte_size(size_t s) {
248 #ifdef _LP64
249 if (s >= 100*G) {
250 return "G";
251 }
252 #endif
253 if (s >= 100*M) {
254 return "M";
255 } else if (s >= 100*K) {
256 return "K";
257 } else {
258 return "B";
259 }
260 }
261
262 template <class T>
263 inline T byte_size_in_proper_unit(T s) {
264 #ifdef _LP64
265 if (s >= 100*G) {
266 return (T)(s/G);
267 }
268 #endif
269 if (s >= 100*M) {
270 return (T)(s/M);
271 } else if (s >= 100*K) {
272 return (T)(s/K);
273 } else {
274 return s;
275 }
276 }
277
278 inline const char* exact_unit_for_byte_size(size_t s) {
279 #ifdef _LP64
280 if (s >= G && (s % G) == 0) {
281 return "G";
282 }
283 #endif
284 if (s >= M && (s % M) == 0) {
285 return "M";
286 }
287 if (s >= K && (s % K) == 0) {
288 return "K";
289 }
290 return "B";
291 }
292
293 inline size_t byte_size_in_exact_unit(size_t s) {
294 #ifdef _LP64
295 if (s >= G && (s % G) == 0) {
296 return s / G;
297 }
298 #endif
299 if (s >= M && (s % M) == 0) {
300 return s / M;
301 }
302 if (s >= K && (s % K) == 0) {
303 return s / K;
304 }
305 return s;
306 }
307
308 //----------------------------------------------------------------------------------------------------
309 // VM type definitions
310
311 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
312 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
313
314 typedef intptr_t intx;
315 typedef uintptr_t uintx;
316
317 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1);
318 const intx max_intx = (uintx)min_intx - 1;
319 const uintx max_uintx = (uintx)-1;
320
321 // Table of values:
322 // sizeof intx 4 8
323 // min_intx 0x80000000 0x8000000000000000
324 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF
325 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF
326
327 typedef unsigned int uint; NEEDS_CLEANUP
328
329
330 //----------------------------------------------------------------------------------------------------
331 // Java type definitions
332
333 // All kinds of 'plain' byte addresses
334 typedef signed char s_char;
335 typedef unsigned char u_char;
336 typedef u_char* address;
337 typedef uintptr_t address_word; // unsigned integer which will hold a pointer
338 // except for some implementations of a C++
339 // linkage pointer to function. Should never
340 // need one of those to be placed in this
341 // type anyway.
342
343 // Utility functions to "portably" (?) bit twiddle pointers
344 // Where portable means keep ANSI C++ compilers quiet
345
346 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); }
347 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); }
348
349 // Utility functions to "portably" make cast to/from function pointers.
350
351 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; }
352 inline address_word castable_address(address x) { return address_word(x) ; }
353 inline address_word castable_address(void* x) { return address_word(x) ; }
354
355 // Pointer subtraction.
356 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
357 // the range we might need to find differences from one end of the heap
358 // to the other.
359 // A typical use might be:
360 // if (pointer_delta(end(), top()) >= size) {
361 // // enough room for an object of size
362 // ...
363 // and then additions like
364 // ... top() + size ...
365 // are safe because we know that top() is at least size below end().
366 inline size_t pointer_delta(const volatile void* left,
367 const volatile void* right,
368 size_t element_size) {
369 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
370 }
371
372 // A version specialized for HeapWord*'s.
373 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
374 return pointer_delta(left, right, sizeof(HeapWord));
375 }
376 // A version specialized for MetaWord*'s.
377 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
378 return pointer_delta(left, right, sizeof(MetaWord));
379 }
380
381 //
382 // ANSI C++ does not allow casting from one pointer type to a function pointer
383 // directly without at best a warning. This macro accomplishes it silently
384 // In every case that is present at this point the value be cast is a pointer
385 // to a C linkage function. In some case the type used for the cast reflects
386 // that linkage and a picky compiler would not complain. In other cases because
387 // there is no convenient place to place a typedef with extern C linkage (i.e
388 // a platform dependent header file) it doesn't. At this point no compiler seems
389 // picky enough to catch these instances (which are few). It is possible that
390 // using templates could fix these for all cases. This use of templates is likely
391 // so far from the middle of the road that it is likely to be problematic in
392 // many C++ compilers.
393 //
394 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value))
395 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
396
397 // Unsigned byte types for os and stream.hpp
398
399 // Unsigned one, two, four and eigth byte quantities used for describing
400 // the .class file format. See JVM book chapter 4.
401
402 typedef jubyte u1;
403 typedef jushort u2;
404 typedef juint u4;
405 typedef julong u8;
406
407 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte
408 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort
409 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint
410 const julong max_julong = (julong)-1; // 0xFF....FF largest julong
411
412 typedef jbyte s1;
413 typedef jshort s2;
414 typedef jint s4;
415 typedef jlong s8;
416
417 const jbyte min_jbyte = -(1 << 7); // smallest jbyte
418 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte
419 const jshort min_jshort = -(1 << 15); // smallest jshort
420 const jshort max_jshort = (1 << 15) - 1; // largest jshort
421
422 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
423 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint
424
425 //----------------------------------------------------------------------------------------------------
426 // JVM spec restrictions
427
428 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134)
429
430 //----------------------------------------------------------------------------------------------------
431 // Default and minimum StringTableSize values
432
433 const int defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
434 const int minimumStringTableSize = 128;
435
436 const int defaultSymbolTableSize = 20011;
437 const int minimumSymbolTableSize = 1009;
438
439
440 //----------------------------------------------------------------------------------------------------
441 // HotSwap - for JVMTI aka Class File Replacement and PopFrame
442 //
443 // Determines whether on-the-fly class replacement and frame popping are enabled.
444
445 #define HOTSWAP
446
447 //----------------------------------------------------------------------------------------------------
448 // Object alignment, in units of HeapWords.
449 //
450 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
451 // reference fields can be naturally aligned.
452
453 extern int MinObjAlignment;
454 extern int MinObjAlignmentInBytes;
455 extern int MinObjAlignmentInBytesMask;
456
457 extern int LogMinObjAlignment;
458 extern int LogMinObjAlignmentInBytes;
459
460 const int LogKlassAlignmentInBytes = 3;
461 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize;
462 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes;
463 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize;
464
465 // Maximal size of heap where unscaled compression can be used. Also upper bound
466 // for heap placement: 4GB.
467 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
468 // Maximal size of heap where compressed oops can be used. Also upper bound for heap
469 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes.
470 extern uint64_t OopEncodingHeapMax;
471
472 // Maximal size of compressed class space. Above this limit compression is not possible.
473 // Also upper bound for placement of zero based class space. (Class space is further limited
474 // to be < 3G, see arguments.cpp.)
475 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
476
477 // Machine dependent stuff
478
479 // The maximum size of the code cache. Can be overridden by targets.
480 #define CODE_CACHE_SIZE_LIMIT (2*G)
481 // Allow targets to reduce the default size of the code cache.
482 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT
483
484 #include CPU_HEADER(globalDefinitions)
485
486 // To assure the IRIW property on processors that are not multiple copy
487 // atomic, sync instructions must be issued between volatile reads to
488 // assure their ordering, instead of after volatile stores.
489 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models"
490 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
491 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC
492 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true;
493 #else
494 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
495 #endif
496
497 // The expected size in bytes of a cache line, used to pad data structures.
498 #ifndef DEFAULT_CACHE_LINE_SIZE
499 #define DEFAULT_CACHE_LINE_SIZE 64
500 #endif
501
502
503 //----------------------------------------------------------------------------------------------------
504 // Utility macros for compilers
505 // used to silence compiler warnings
506
507 #define Unused_Variable(var) var
508
509
510 //----------------------------------------------------------------------------------------------------
511 // Miscellaneous
512
513 // 6302670 Eliminate Hotspot __fabsf dependency
514 // All fabs() callers should call this function instead, which will implicitly
515 // convert the operand to double, avoiding a dependency on __fabsf which
516 // doesn't exist in early versions of Solaris 8.
517 inline double fabsd(double value) {
518 return fabs(value);
519 }
520
521 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
522 // is zero, return 0.0.
523 template<typename T>
524 inline double percent_of(T numerator, T denominator) {
525 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
526 }
527
528 //----------------------------------------------------------------------------------------------------
529 // Special casts
530 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
531 typedef union {
532 jfloat f;
533 jint i;
534 } FloatIntConv;
535
536 typedef union {
537 jdouble d;
538 jlong l;
539 julong ul;
540 } DoubleLongConv;
541
542 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; }
543 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; }
544
545 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; }
546 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; }
547 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; }
548
549 inline jint low (jlong value) { return jint(value); }
550 inline jint high(jlong value) { return jint(value >> 32); }
551
552 // the fancy casts are a hopefully portable way
553 // to do unsigned 32 to 64 bit type conversion
554 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32;
555 *value |= (jlong)(julong)(juint)low; }
556
557 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff;
558 *value |= (jlong)high << 32; }
559
560 inline jlong jlong_from(jint h, jint l) {
561 jlong result = 0; // initialization to avoid warning
562 set_high(&result, h);
563 set_low(&result, l);
564 return result;
565 }
566
567 union jlong_accessor {
568 jint words[2];
569 jlong long_value;
570 };
571
572 void basic_types_init(); // cannot define here; uses assert
573
574
575 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
576 enum BasicType {
577 T_BOOLEAN = 4,
578 T_CHAR = 5,
579 T_FLOAT = 6,
580 T_DOUBLE = 7,
581 T_BYTE = 8,
582 T_SHORT = 9,
583 T_INT = 10,
584 T_LONG = 11,
585 T_OBJECT = 12,
586 T_ARRAY = 13,
587 T_VOID = 14,
588 T_ADDRESS = 15,
589 T_NARROWOOP = 16,
590 T_METADATA = 17,
591 T_NARROWKLASS = 18,
592 T_CONFLICT = 19, // for stack value type with conflicting contents
593 T_ILLEGAL = 99
594 };
595
596 inline bool is_java_primitive(BasicType t) {
597 return T_BOOLEAN <= t && t <= T_LONG;
598 }
599
600 inline bool is_subword_type(BasicType t) {
601 // these guys are processed exactly like T_INT in calling sequences:
602 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
603 }
604
605 inline bool is_signed_subword_type(BasicType t) {
606 return (t == T_BYTE || t == T_SHORT);
607 }
608
609 inline bool is_reference_type(BasicType t) {
610 return (t == T_OBJECT || t == T_ARRAY);
611 }
612
613 // Convert a char from a classfile signature to a BasicType
614 inline BasicType char2type(char c) {
615 switch( c ) {
616 case 'B': return T_BYTE;
617 case 'C': return T_CHAR;
618 case 'D': return T_DOUBLE;
619 case 'F': return T_FLOAT;
620 case 'I': return T_INT;
621 case 'J': return T_LONG;
622 case 'S': return T_SHORT;
623 case 'Z': return T_BOOLEAN;
624 case 'V': return T_VOID;
625 case 'L': return T_OBJECT;
626 case '[': return T_ARRAY;
627 }
628 return T_ILLEGAL;
629 }
630
631 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
632 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
633 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
634 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
635 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
636 extern BasicType name2type(const char* name);
637
638 // Auxiliary math routines
639 // least common multiple
640 extern size_t lcm(size_t a, size_t b);
641
642
643 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
644 enum BasicTypeSize {
645 T_BOOLEAN_size = 1,
646 T_CHAR_size = 1,
647 T_FLOAT_size = 1,
648 T_DOUBLE_size = 2,
649 T_BYTE_size = 1,
650 T_SHORT_size = 1,
651 T_INT_size = 1,
652 T_LONG_size = 2,
653 T_OBJECT_size = 1,
654 T_ARRAY_size = 1,
655 T_NARROWOOP_size = 1,
656 T_NARROWKLASS_size = 1,
657 T_VOID_size = 0
658 };
659
660
661 // maps a BasicType to its instance field storage type:
662 // all sub-word integral types are widened to T_INT
663 extern BasicType type2field[T_CONFLICT+1];
664 extern BasicType type2wfield[T_CONFLICT+1];
665
666
667 // size in bytes
668 enum ArrayElementSize {
669 T_BOOLEAN_aelem_bytes = 1,
670 T_CHAR_aelem_bytes = 2,
671 T_FLOAT_aelem_bytes = 4,
672 T_DOUBLE_aelem_bytes = 8,
673 T_BYTE_aelem_bytes = 1,
674 T_SHORT_aelem_bytes = 2,
675 T_INT_aelem_bytes = 4,
676 T_LONG_aelem_bytes = 8,
677 #ifdef _LP64
678 T_OBJECT_aelem_bytes = 8,
679 T_ARRAY_aelem_bytes = 8,
680 #else
681 T_OBJECT_aelem_bytes = 4,
682 T_ARRAY_aelem_bytes = 4,
683 #endif
684 T_NARROWOOP_aelem_bytes = 4,
685 T_NARROWKLASS_aelem_bytes = 4,
686 T_VOID_aelem_bytes = 0
687 };
688
689 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
690 #ifdef ASSERT
691 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
692 #else
693 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
694 #endif
695
696
697 // JavaValue serves as a container for arbitrary Java values.
698
699 class JavaValue {
700
701 public:
702 typedef union JavaCallValue {
703 jfloat f;
704 jdouble d;
705 jint i;
706 jlong l;
707 jobject h;
708 } JavaCallValue;
709
710 private:
711 BasicType _type;
712 JavaCallValue _value;
713
714 public:
715 JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
716
717 JavaValue(jfloat value) {
718 _type = T_FLOAT;
719 _value.f = value;
720 }
721
722 JavaValue(jdouble value) {
723 _type = T_DOUBLE;
724 _value.d = value;
725 }
726
727 jfloat get_jfloat() const { return _value.f; }
728 jdouble get_jdouble() const { return _value.d; }
729 jint get_jint() const { return _value.i; }
730 jlong get_jlong() const { return _value.l; }
731 jobject get_jobject() const { return _value.h; }
732 JavaCallValue* get_value_addr() { return &_value; }
733 BasicType get_type() const { return _type; }
734
735 void set_jfloat(jfloat f) { _value.f = f;}
736 void set_jdouble(jdouble d) { _value.d = d;}
737 void set_jint(jint i) { _value.i = i;}
738 void set_jlong(jlong l) { _value.l = l;}
739 void set_jobject(jobject h) { _value.h = h;}
740 void set_type(BasicType t) { _type = t; }
741
742 jboolean get_jboolean() const { return (jboolean) (_value.i);}
743 jbyte get_jbyte() const { return (jbyte) (_value.i);}
744 jchar get_jchar() const { return (jchar) (_value.i);}
745 jshort get_jshort() const { return (jshort) (_value.i);}
746
747 };
748
749
750 #define STACK_BIAS 0
751 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
752 // in order to extend the reach of the stack pointer.
753 #if defined(SPARC) && defined(_LP64)
754 #undef STACK_BIAS
755 #define STACK_BIAS 0x7ff
756 #endif
757
758
759 // TosState describes the top-of-stack state before and after the execution of
760 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
761 // registers. The TosState corresponds to the 'machine representation' of this cached
762 // value. There's 4 states corresponding to the JAVA types int, long, float & double
763 // as well as a 5th state in case the top-of-stack value is actually on the top
764 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
765 // state when it comes to machine representation but is used separately for (oop)
766 // type specific operations (e.g. verification code).
767
768 enum TosState { // describes the tos cache contents
769 btos = 0, // byte, bool tos cached
770 ztos = 1, // byte, bool tos cached
771 ctos = 2, // char tos cached
772 stos = 3, // short tos cached
773 itos = 4, // int tos cached
774 ltos = 5, // long tos cached
775 ftos = 6, // float tos cached
776 dtos = 7, // double tos cached
777 atos = 8, // object cached
778 vtos = 9, // tos not cached
779 number_of_states,
780 ilgl // illegal state: should not occur
781 };
782
783
784 inline TosState as_TosState(BasicType type) {
785 switch (type) {
786 case T_BYTE : return btos;
787 case T_BOOLEAN: return ztos;
788 case T_CHAR : return ctos;
789 case T_SHORT : return stos;
790 case T_INT : return itos;
791 case T_LONG : return ltos;
792 case T_FLOAT : return ftos;
793 case T_DOUBLE : return dtos;
794 case T_VOID : return vtos;
795 case T_ARRAY : // fall through
796 case T_OBJECT : return atos;
797 default : return ilgl;
798 }
799 }
800
801 inline BasicType as_BasicType(TosState state) {
802 switch (state) {
803 case btos : return T_BYTE;
804 case ztos : return T_BOOLEAN;
805 case ctos : return T_CHAR;
806 case stos : return T_SHORT;
807 case itos : return T_INT;
808 case ltos : return T_LONG;
809 case ftos : return T_FLOAT;
810 case dtos : return T_DOUBLE;
811 case atos : return T_OBJECT;
812 case vtos : return T_VOID;
813 default : return T_ILLEGAL;
814 }
815 }
816
817
818 // Helper function to convert BasicType info into TosState
819 // Note: Cannot define here as it uses global constant at the time being.
820 TosState as_TosState(BasicType type);
821
822
823 // JavaThreadState keeps track of which part of the code a thread is executing in. This
824 // information is needed by the safepoint code.
825 //
826 // There are 4 essential states:
827 //
828 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code)
829 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles
830 // _thread_in_vm : Executing in the vm
831 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub)
832 //
833 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
834 // a transition from one state to another. These extra states makes it possible for the safepoint code to
835 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
836 //
837 // Given a state, the xxxx_trans state can always be found by adding 1.
838 //
839 enum JavaThreadState {
840 _thread_uninitialized = 0, // should never happen (missing initialization)
841 _thread_new = 2, // just starting up, i.e., in process of being initialized
842 _thread_new_trans = 3, // corresponding transition state (not used, included for completness)
843 _thread_in_native = 4, // running in native code
844 _thread_in_native_trans = 5, // corresponding transition state
845 _thread_in_vm = 6, // running in VM
846 _thread_in_vm_trans = 7, // corresponding transition state
847 _thread_in_Java = 8, // running in Java or in stub code
848 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness)
849 _thread_blocked = 10, // blocked in vm
850 _thread_blocked_trans = 11, // corresponding transition state
851 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation
852 };
853
854
855
856 //----------------------------------------------------------------------------------------------------
857 // 'Forward' declarations of frequently used classes
858 // (in order to reduce interface dependencies & reduce
859 // number of unnecessary compilations after changes)
860
861 class ClassFileStream;
862
863 class Event;
864
865 class Thread;
866 class VMThread;
867 class JavaThread;
868 class Threads;
869
870 class VM_Operation;
871 class VMOperationQueue;
872
873 class CodeBlob;
874 class CompiledMethod;
875 class nmethod;
876 class RuntimeBlob;
877 class OSRAdapter;
878 class I2CAdapter;
879 class C2IAdapter;
880 class CompiledIC;
881 class relocInfo;
882 class ScopeDesc;
883 class PcDesc;
884
885 class Recompiler;
886 class Recompilee;
887 class RecompilationPolicy;
888 class RFrame;
889 class CompiledRFrame;
890 class InterpretedRFrame;
891
892 class vframe;
893 class javaVFrame;
894 class interpretedVFrame;
895 class compiledVFrame;
896 class deoptimizedVFrame;
897 class externalVFrame;
898 class entryVFrame;
899
900 class RegisterMap;
901
902 class Mutex;
903 class Monitor;
904 class BasicLock;
905 class BasicObjectLock;
906
907 class PeriodicTask;
908
909 class JavaCallWrapper;
910
911 class oopDesc;
912 class metaDataOopDesc;
913
914 class NativeCall;
915
916 class zone;
917
918 class StubQueue;
919
920 class outputStream;
921
922 class ResourceArea;
923
924 class DebugInformationRecorder;
925 class ScopeValue;
926 class CompressedStream;
927 class DebugInfoReadStream;
928 class DebugInfoWriteStream;
929 class LocationValue;
930 class ConstantValue;
931 class IllegalValue;
932
933 class PrivilegedElement;
934 class MonitorArray;
935
936 class MonitorInfo;
937
938 class OffsetClosure;
939 class OopMapCache;
940 class InterpreterOopMap;
941 class OopMapCacheEntry;
942 class OSThread;
943
944 typedef int (*OSThreadStartFunc)(void*);
945
946 class Space;
947
948 class JavaValue;
949 class methodHandle;
950 class JavaCallArguments;
951
952 //----------------------------------------------------------------------------------------------------
953 // Special constants for debugging
954
955 const jint badInt = -3; // generic "bad int" value
956 const intptr_t badAddressVal = -2; // generic "bad address" value
957 const intptr_t badOopVal = -1; // generic "bad oop" value
958 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
959 const int badStackSegVal = 0xCA; // value used to zap stack segments
960 const int badHandleValue = 0xBC; // value used to zap vm handle area
961 const int badResourceValue = 0xAB; // value used to zap resource area
962 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
963 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
964 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk
965 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
966 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC
967 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation
968 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
969
970
971 // (These must be implemented as #defines because C++ compilers are
972 // not obligated to inline non-integral constants!)
973 #define badAddress ((address)::badAddressVal)
974 #define badOop (cast_to_oop(::badOopVal))
975 #define badHeapWord (::badHeapWordVal)
976
977 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
978 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
979
980 //----------------------------------------------------------------------------------------------------
981 // Utility functions for bitfield manipulations
982
983 const intptr_t AllBits = ~0; // all bits set in a word
984 const intptr_t NoBits = 0; // no bits set in a word
985 const jlong NoLongBits = 0; // no bits set in a long
986 const intptr_t OneBit = 1; // only right_most bit set in a word
987
988 // get a word with the n.th or the right-most or left-most n bits set
989 // (note: #define used only so that they can be used in enum constant definitions)
990 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n)))
991 #define right_n_bits(n) (nth_bit(n) - 1)
992 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n))))
993
994 // bit-operations using a mask m
995 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; }
996 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; }
997 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; }
998 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; }
999 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
1000
1001 // bit-operations using the n.th bit
1002 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); }
1003 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
1004 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
1005
1006 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
1007 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
1008 return mask_bits(x >> start_bit_no, right_n_bits(field_length));
1009 }
1010
1011
1012 //----------------------------------------------------------------------------------------------------
1013 // Utility functions for integers
1014
1015 // Avoid use of global min/max macros which may cause unwanted double
1016 // evaluation of arguments.
1017 #ifdef max
1018 #undef max
1019 #endif
1020
1021 #ifdef min
1022 #undef min
1023 #endif
1024
1025 // It is necessary to use templates here. Having normal overloaded
1026 // functions does not work because it is necessary to provide both 32-
1027 // and 64-bit overloaded functions, which does not work, and having
1028 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
1029 // will be even more error-prone than macros.
1030 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; }
1031 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; }
1032 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); }
1033 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); }
1034 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
1035 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
1036
1037 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; }
1038
1039 // true if x is a power of 2, false otherwise
1040 inline bool is_power_of_2(intptr_t x) {
1041 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
1042 }
1043
1044 // long version of is_power_of_2
1045 inline bool is_power_of_2_long(jlong x) {
1046 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
1047 }
1048
1049 // Returns largest i such that 2^i <= x.
1050 // If x == 0, the function returns -1.
1051 inline int log2_intptr(uintptr_t x) {
1052 int i = -1;
1053 uintptr_t p = 1;
1054 while (p != 0 && p <= x) {
1055 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1056 i++; p *= 2;
1057 }
1058 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1059 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size).
1060 return i;
1061 }
1062
1063 //* largest i such that 2^i <= x
1064 inline int log2_long(julong x) {
1065 int i = -1;
1066 julong p = 1;
1067 while (p != 0 && p <= x) {
1068 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
1069 i++; p *= 2;
1070 }
1071 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
1072 // (if p = 0 then overflow occurred and i = 63)
1073 return i;
1074 }
1075
1076 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine.
1077 inline int log2_intptr(intptr_t x) {
1078 return log2_intptr((uintptr_t)x);
1079 }
1080
1081 inline int log2_int(int x) {
1082 STATIC_ASSERT(sizeof(int) <= sizeof(uintptr_t));
1083 return log2_intptr((uintptr_t)x);
1084 }
1085
1086 inline int log2_jint(jint x) {
1087 STATIC_ASSERT(sizeof(jint) <= sizeof(uintptr_t));
1088 return log2_intptr((uintptr_t)x);
1089 }
1090
1091 inline int log2_uint(uint x) {
1092 STATIC_ASSERT(sizeof(uint) <= sizeof(uintptr_t));
1093 return log2_intptr((uintptr_t)x);
1094 }
1095
1096 // A negative value of 'x' will return '63'
1097 inline int log2_jlong(jlong x) {
1098 STATIC_ASSERT(sizeof(jlong) <= sizeof(julong));
1099 return log2_long((julong)x);
1100 }
1101
1102 //* the argument must be exactly a power of 2
1103 inline int exact_log2(intptr_t x) {
1104 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x);
1105 return log2_intptr(x);
1106 }
1107
1108 //* the argument must be exactly a power of 2
1109 inline int exact_log2_long(jlong x) {
1110 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x);
1111 return log2_long(x);
1112 }
1113
1114 inline bool is_odd (intx x) { return x & 1; }
1115 inline bool is_even(intx x) { return !is_odd(x); }
1116
1117 // abs methods which cannot overflow and so are well-defined across
1118 // the entire domain of integer types.
1119 static inline unsigned int uabs(unsigned int n) {
1120 union {
1121 unsigned int result;
1122 int value;
1123 };
1124 result = n;
1125 if (value < 0) result = 0-result;
1126 return result;
1127 }
1128 static inline julong uabs(julong n) {
1129 union {
1130 julong result;
1131 jlong value;
1132 };
1133 result = n;
1134 if (value < 0) result = 0-result;
1135 return result;
1136 }
1137 static inline julong uabs(jlong n) { return uabs((julong)n); }
1138 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); }
1139
1140 // "to" should be greater than "from."
1141 inline intx byte_size(void* from, void* to) {
1142 return (address)to - (address)from;
1143 }
1144
1145 //----------------------------------------------------------------------------------------------------
1146 // Avoid non-portable casts with these routines (DEPRECATED)
1147
1148 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
1149 // Bytes is optimized machine-specifically and may be much faster then the portable routines below.
1150
1151 // Given sequence of four bytes, build into a 32-bit word
1152 // following the conventions used in class files.
1153 // On the 386, this could be realized with a simple address cast.
1154 //
1155
1156 // This routine takes eight bytes:
1157 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1158 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 ))
1159 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 ))
1160 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 ))
1161 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 ))
1162 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 ))
1163 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 ))
1164 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 ))
1165 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 ));
1166 }
1167
1168 // This routine takes four bytes:
1169 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1170 return (( u4(c1) << 24 ) & 0xff000000)
1171 | (( u4(c2) << 16 ) & 0x00ff0000)
1172 | (( u4(c3) << 8 ) & 0x0000ff00)
1173 | (( u4(c4) << 0 ) & 0x000000ff);
1174 }
1175
1176 // And this one works if the four bytes are contiguous in memory:
1177 inline u4 build_u4_from( u1* p ) {
1178 return build_u4_from( p[0], p[1], p[2], p[3] );
1179 }
1180
1181 // Ditto for two-byte ints:
1182 inline u2 build_u2_from( u1 c1, u1 c2 ) {
1183 return u2((( u2(c1) << 8 ) & 0xff00)
1184 | (( u2(c2) << 0 ) & 0x00ff));
1185 }
1186
1187 // And this one works if the two bytes are contiguous in memory:
1188 inline u2 build_u2_from( u1* p ) {
1189 return build_u2_from( p[0], p[1] );
1190 }
1191
1192 // Ditto for floats:
1193 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
1194 u4 u = build_u4_from( c1, c2, c3, c4 );
1195 return *(jfloat*)&u;
1196 }
1197
1198 inline jfloat build_float_from( u1* p ) {
1199 u4 u = build_u4_from( p );
1200 return *(jfloat*)&u;
1201 }
1202
1203
1204 // now (64-bit) longs
1205
1206 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1207 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 ))
1208 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 ))
1209 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 ))
1210 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 ))
1211 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 ))
1212 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 ))
1213 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 ))
1214 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 ));
1215 }
1216
1217 inline jlong build_long_from( u1* p ) {
1218 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
1219 }
1220
1221
1222 // Doubles, too!
1223 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
1224 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
1225 return *(jdouble*)&u;
1226 }
1227
1228 inline jdouble build_double_from( u1* p ) {
1229 jlong u = build_long_from( p );
1230 return *(jdouble*)&u;
1231 }
1232
1233
1234 // Portable routines to go the other way:
1235
1236 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
1237 c1 = u1(x >> 8);
1238 c2 = u1(x);
1239 }
1240
1241 inline void explode_short_to( u2 x, u1* p ) {
1242 explode_short_to( x, p[0], p[1]);
1243 }
1244
1245 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
1246 c1 = u1(x >> 24);
1247 c2 = u1(x >> 16);
1248 c3 = u1(x >> 8);
1249 c4 = u1(x);
1250 }
1251
1252 inline void explode_int_to( u4 x, u1* p ) {
1253 explode_int_to( x, p[0], p[1], p[2], p[3]);
1254 }
1255
1256
1257 // Pack and extract shorts to/from ints:
1258
1259 inline int extract_low_short_from_int(jint x) {
1260 return x & 0xffff;
1261 }
1262
1263 inline int extract_high_short_from_int(jint x) {
1264 return (x >> 16) & 0xffff;
1265 }
1266
1267 inline int build_int_from_shorts( jushort low, jushort high ) {
1268 return ((int)((unsigned int)high << 16) | (unsigned int)low);
1269 }
1270
1271 // Convert pointer to intptr_t, for use in printing pointers.
1272 inline intptr_t p2i(const void * p) {
1273 return (intptr_t) p;
1274 }
1275
1276 // swap a & b
1277 template<class T> static void swap(T& a, T& b) {
1278 T tmp = a;
1279 a = b;
1280 b = tmp;
1281 }
1282
1283 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
1284
1285 //----------------------------------------------------------------------------------------------------
1286 // Sum and product which can never overflow: they wrap, just like the
1287 // Java operations. Note that we don't intend these to be used for
1288 // general-purpose arithmetic: their purpose is to emulate Java
1289 // operations.
1290
1291 // The goal of this code to avoid undefined or implementation-defined
1292 // behavior. The use of an lvalue to reference cast is explicitly
1293 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para
1294 // 15 in C++03]
1295 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \
1296 inline TYPE NAME (TYPE in1, TYPE in2) { \
1297 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \
1298 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \
1299 return reinterpret_cast<TYPE&>(ures); \
1300 }
1301
1302 JAVA_INTEGER_OP(+, java_add, jint, juint)
1303 JAVA_INTEGER_OP(-, java_subtract, jint, juint)
1304 JAVA_INTEGER_OP(*, java_multiply, jint, juint)
1305 JAVA_INTEGER_OP(+, java_add, jlong, julong)
1306 JAVA_INTEGER_OP(-, java_subtract, jlong, julong)
1307 JAVA_INTEGER_OP(*, java_multiply, jlong, julong)
1308
1309 #undef JAVA_INTEGER_OP
1310
1311 // Dereference vptr
1312 // All C++ compilers that we know of have the vtbl pointer in the first
1313 // word. If there are exceptions, this function needs to be made compiler
1314 // specific.
1315 static inline void* dereference_vptr(const void* addr) {
1316 return *(void**)addr;
1317 }
1318
1319 //----------------------------------------------------------------------------------------------------
1320 // String type aliases used by command line flag declarations and
1321 // processing utilities.
1322
1323 typedef const char* ccstr;
1324 typedef const char* ccstrlist; // represents string arguments which accumulate
1325
1326 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP