1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 27 28 #include "utilities/compilerWarnings.hpp" 29 #include "utilities/debug.hpp" 30 #include "utilities/macros.hpp" 31 32 #include COMPILER_HEADER(utilities/globalDefinitions) 33 34 // Defaults for macros that might be defined per compiler. 35 #ifndef NOINLINE 36 #define NOINLINE 37 #endif 38 #ifndef ALWAYSINLINE 39 #define ALWAYSINLINE inline 40 #endif 41 42 #ifndef ATTRIBUTE_ALIGNED 43 #define ATTRIBUTE_ALIGNED(x) 44 #endif 45 46 // This file holds all globally used constants & types, class (forward) 47 // declarations and a few frequently used utility functions. 48 49 //---------------------------------------------------------------------------------------------------- 50 // Printf-style formatters for fixed- and variable-width types as pointers and 51 // integers. These are derived from the definitions in inttypes.h. If the platform 52 // doesn't provide appropriate definitions, they should be provided in 53 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp) 54 55 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false") 56 57 // Format 32-bit quantities. 58 #define INT32_FORMAT "%" PRId32 59 #define UINT32_FORMAT "%" PRIu32 60 #define INT32_FORMAT_W(width) "%" #width PRId32 61 #define UINT32_FORMAT_W(width) "%" #width PRIu32 62 63 #define PTR32_FORMAT "0x%08" PRIx32 64 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32 65 66 // Format 64-bit quantities. 67 #define INT64_FORMAT "%" PRId64 68 #define UINT64_FORMAT "%" PRIu64 69 #define UINT64_FORMAT_X "%" PRIx64 70 #define INT64_FORMAT_W(width) "%" #width PRId64 71 #define UINT64_FORMAT_W(width) "%" #width PRIu64 72 73 #define PTR64_FORMAT "0x%016" PRIx64 74 75 // Format jlong, if necessary 76 #ifndef JLONG_FORMAT 77 #define JLONG_FORMAT INT64_FORMAT 78 #endif 79 #ifndef JULONG_FORMAT 80 #define JULONG_FORMAT UINT64_FORMAT 81 #endif 82 #ifndef JULONG_FORMAT_X 83 #define JULONG_FORMAT_X UINT64_FORMAT_X 84 #endif 85 86 // Format pointers which change size between 32- and 64-bit. 87 #ifdef _LP64 88 #define INTPTR_FORMAT "0x%016" PRIxPTR 89 #define PTR_FORMAT "0x%016" PRIxPTR 90 #else // !_LP64 91 #define INTPTR_FORMAT "0x%08" PRIxPTR 92 #define PTR_FORMAT "0x%08" PRIxPTR 93 #endif // _LP64 94 95 // Format pointers without leading zeros 96 #define INTPTRNZ_FORMAT "0x%" PRIxPTR 97 98 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR 99 100 #define SSIZE_FORMAT "%" PRIdPTR 101 #define SIZE_FORMAT "%" PRIuPTR 102 #define SIZE_FORMAT_HEX "0x%" PRIxPTR 103 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR 104 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR 105 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR 106 107 #define INTX_FORMAT "%" PRIdPTR 108 #define UINTX_FORMAT "%" PRIuPTR 109 #define INTX_FORMAT_W(width) "%" #width PRIdPTR 110 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR 111 112 //---------------------------------------------------------------------------------------------------- 113 // Constants 114 115 const int LogBytesPerShort = 1; 116 const int LogBytesPerInt = 2; 117 #ifdef _LP64 118 const int LogBytesPerWord = 3; 119 #else 120 const int LogBytesPerWord = 2; 121 #endif 122 const int LogBytesPerLong = 3; 123 124 const int BytesPerShort = 1 << LogBytesPerShort; 125 const int BytesPerInt = 1 << LogBytesPerInt; 126 const int BytesPerWord = 1 << LogBytesPerWord; 127 const int BytesPerLong = 1 << LogBytesPerLong; 128 129 const int LogBitsPerByte = 3; 130 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort; 131 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt; 132 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord; 133 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong; 134 135 const int BitsPerByte = 1 << LogBitsPerByte; 136 const int BitsPerShort = 1 << LogBitsPerShort; 137 const int BitsPerInt = 1 << LogBitsPerInt; 138 const int BitsPerWord = 1 << LogBitsPerWord; 139 const int BitsPerLong = 1 << LogBitsPerLong; 140 141 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1; 142 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1; 143 144 const int WordsPerLong = 2; // Number of stack entries for longs 145 146 const int oopSize = sizeof(char*); // Full-width oop 147 extern int heapOopSize; // Oop within a java object 148 const int wordSize = sizeof(char*); 149 const int longSize = sizeof(jlong); 150 const int jintSize = sizeof(jint); 151 const int size_tSize = sizeof(size_t); 152 153 const int BytesPerOop = BytesPerWord; // Full-width oop 154 155 extern int LogBytesPerHeapOop; // Oop within a java object 156 extern int LogBitsPerHeapOop; 157 extern int BytesPerHeapOop; 158 extern int BitsPerHeapOop; 159 160 const int BitsPerJavaInteger = 32; 161 const int BitsPerJavaLong = 64; 162 const int BitsPerSize_t = size_tSize * BitsPerByte; 163 164 // Size of a char[] needed to represent a jint as a string in decimal. 165 const int jintAsStringSize = 12; 166 167 // In fact this should be 168 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 169 // see os::set_memory_serialize_page() 170 #ifdef _LP64 171 const int SerializePageShiftCount = 4; 172 #else 173 const int SerializePageShiftCount = 3; 174 #endif 175 176 // An opaque struct of heap-word width, so that HeapWord* can be a generic 177 // pointer into the heap. We require that object sizes be measured in 178 // units of heap words, so that that 179 // HeapWord* hw; 180 // hw += oop(hw)->foo(); 181 // works, where foo is a method (like size or scavenge) that returns the 182 // object size. 183 class HeapWord { 184 friend class VMStructs; 185 private: 186 char* i; 187 #ifndef PRODUCT 188 public: 189 char* value() { return i; } 190 #endif 191 }; 192 193 // Analogous opaque struct for metadata allocated from 194 // metaspaces. 195 class MetaWord { 196 private: 197 char* i; 198 }; 199 200 // HeapWordSize must be 2^LogHeapWordSize. 201 const int HeapWordSize = sizeof(HeapWord); 202 #ifdef _LP64 203 const int LogHeapWordSize = 3; 204 #else 205 const int LogHeapWordSize = 2; 206 #endif 207 const int HeapWordsPerLong = BytesPerLong / HeapWordSize; 208 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize; 209 210 // The minimum number of native machine words necessary to contain "byte_size" 211 // bytes. 212 inline size_t heap_word_size(size_t byte_size) { 213 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize; 214 } 215 216 //------------------------------------------- 217 // Constant for jlong (standardized by C++11) 218 219 // Build a 64bit integer constant 220 #define CONST64(x) (x ## LL) 221 #define UCONST64(x) (x ## ULL) 222 223 const jlong min_jlong = CONST64(0x8000000000000000); 224 const jlong max_jlong = CONST64(0x7fffffffffffffff); 225 226 const size_t K = 1024; 227 const size_t M = K*K; 228 const size_t G = M*K; 229 const size_t HWperKB = K / sizeof(HeapWord); 230 231 // Constants for converting from a base unit to milli-base units. For 232 // example from seconds to milliseconds and microseconds 233 234 const int MILLIUNITS = 1000; // milli units per base unit 235 const int MICROUNITS = 1000000; // micro units per base unit 236 const int NANOUNITS = 1000000000; // nano units per base unit 237 238 const jlong NANOSECS_PER_SEC = CONST64(1000000000); 239 const jint NANOSECS_PER_MILLISEC = 1000000; 240 241 inline const char* proper_unit_for_byte_size(size_t s) { 242 #ifdef _LP64 243 if (s >= 10*G) { 244 return "G"; 245 } 246 #endif 247 if (s >= 10*M) { 248 return "M"; 249 } else if (s >= 10*K) { 250 return "K"; 251 } else { 252 return "B"; 253 } 254 } 255 256 template <class T> 257 inline T byte_size_in_proper_unit(T s) { 258 #ifdef _LP64 259 if (s >= 10*G) { 260 return (T)(s/G); 261 } 262 #endif 263 if (s >= 10*M) { 264 return (T)(s/M); 265 } else if (s >= 10*K) { 266 return (T)(s/K); 267 } else { 268 return s; 269 } 270 } 271 272 inline const char* exact_unit_for_byte_size(size_t s) { 273 #ifdef _LP64 274 if (s >= G && (s % G) == 0) { 275 return "G"; 276 } 277 #endif 278 if (s >= M && (s % M) == 0) { 279 return "M"; 280 } 281 if (s >= K && (s % K) == 0) { 282 return "K"; 283 } 284 return "B"; 285 } 286 287 inline size_t byte_size_in_exact_unit(size_t s) { 288 #ifdef _LP64 289 if (s >= G && (s % G) == 0) { 290 return s / G; 291 } 292 #endif 293 if (s >= M && (s % M) == 0) { 294 return s / M; 295 } 296 if (s >= K && (s % K) == 0) { 297 return s / K; 298 } 299 return s; 300 } 301 302 //---------------------------------------------------------------------------------------------------- 303 // VM type definitions 304 305 // intx and uintx are the 'extended' int and 'extended' unsigned int types; 306 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 307 308 typedef intptr_t intx; 309 typedef uintptr_t uintx; 310 311 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 312 const intx max_intx = (uintx)min_intx - 1; 313 const uintx max_uintx = (uintx)-1; 314 315 // Table of values: 316 // sizeof intx 4 8 317 // min_intx 0x80000000 0x8000000000000000 318 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 319 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 320 321 typedef unsigned int uint; NEEDS_CLEANUP 322 323 324 //---------------------------------------------------------------------------------------------------- 325 // Java type definitions 326 327 // All kinds of 'plain' byte addresses 328 typedef signed char s_char; 329 typedef unsigned char u_char; 330 typedef u_char* address; 331 typedef uintptr_t address_word; // unsigned integer which will hold a pointer 332 // except for some implementations of a C++ 333 // linkage pointer to function. Should never 334 // need one of those to be placed in this 335 // type anyway. 336 337 // Utility functions to "portably" (?) bit twiddle pointers 338 // Where portable means keep ANSI C++ compilers quiet 339 340 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 341 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 342 343 // Utility functions to "portably" make cast to/from function pointers. 344 345 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 346 inline address_word castable_address(address x) { return address_word(x) ; } 347 inline address_word castable_address(void* x) { return address_word(x) ; } 348 349 // Pointer subtraction. 350 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 351 // the range we might need to find differences from one end of the heap 352 // to the other. 353 // A typical use might be: 354 // if (pointer_delta(end(), top()) >= size) { 355 // // enough room for an object of size 356 // ... 357 // and then additions like 358 // ... top() + size ... 359 // are safe because we know that top() is at least size below end(). 360 inline size_t pointer_delta(const volatile void* left, 361 const volatile void* right, 362 size_t element_size) { 363 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 364 } 365 366 // A version specialized for HeapWord*'s. 367 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 368 return pointer_delta(left, right, sizeof(HeapWord)); 369 } 370 // A version specialized for MetaWord*'s. 371 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 372 return pointer_delta(left, right, sizeof(MetaWord)); 373 } 374 375 // 376 // ANSI C++ does not allow casting from one pointer type to a function pointer 377 // directly without at best a warning. This macro accomplishes it silently 378 // In every case that is present at this point the value be cast is a pointer 379 // to a C linkage function. In some case the type used for the cast reflects 380 // that linkage and a picky compiler would not complain. In other cases because 381 // there is no convenient place to place a typedef with extern C linkage (i.e 382 // a platform dependent header file) it doesn't. At this point no compiler seems 383 // picky enough to catch these instances (which are few). It is possible that 384 // using templates could fix these for all cases. This use of templates is likely 385 // so far from the middle of the road that it is likely to be problematic in 386 // many C++ compilers. 387 // 388 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 389 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 390 391 // Unsigned byte types for os and stream.hpp 392 393 // Unsigned one, two, four and eigth byte quantities used for describing 394 // the .class file format. See JVM book chapter 4. 395 396 typedef jubyte u1; 397 typedef jushort u2; 398 typedef juint u4; 399 typedef julong u8; 400 401 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 402 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 403 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 404 const julong max_julong = (julong)-1; // 0xFF....FF largest julong 405 406 typedef jbyte s1; 407 typedef jshort s2; 408 typedef jint s4; 409 typedef jlong s8; 410 411 const jbyte min_jbyte = -(1 << 7); // smallest jbyte 412 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 413 const jshort min_jshort = -(1 << 15); // smallest jshort 414 const jshort max_jshort = (1 << 15) - 1; // largest jshort 415 416 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 417 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 418 419 //---------------------------------------------------------------------------------------------------- 420 // JVM spec restrictions 421 422 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 423 424 //---------------------------------------------------------------------------------------------------- 425 // Default and minimum StringTableSize values 426 427 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013); 428 const int minimumStringTableSize = 1009; 429 430 const int defaultSymbolTableSize = 20011; 431 const int minimumSymbolTableSize = 1009; 432 433 434 //---------------------------------------------------------------------------------------------------- 435 // HotSwap - for JVMTI aka Class File Replacement and PopFrame 436 // 437 // Determines whether on-the-fly class replacement and frame popping are enabled. 438 439 #define HOTSWAP 440 441 //---------------------------------------------------------------------------------------------------- 442 // Object alignment, in units of HeapWords. 443 // 444 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 445 // reference fields can be naturally aligned. 446 447 extern int MinObjAlignment; 448 extern int MinObjAlignmentInBytes; 449 extern int MinObjAlignmentInBytesMask; 450 451 extern int LogMinObjAlignment; 452 extern int LogMinObjAlignmentInBytes; 453 454 const int LogKlassAlignmentInBytes = 3; 455 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 456 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 457 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 458 459 // Maximal size of heap where unscaled compression can be used. Also upper bound 460 // for heap placement: 4GB. 461 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 462 // Maximal size of heap where compressed oops can be used. Also upper bound for heap 463 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 464 extern uint64_t OopEncodingHeapMax; 465 466 // Maximal size of compressed class space. Above this limit compression is not possible. 467 // Also upper bound for placement of zero based class space. (Class space is further limited 468 // to be < 3G, see arguments.cpp.) 469 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 470 471 // Machine dependent stuff 472 473 // The maximum size of the code cache. Can be overridden by targets. 474 #define CODE_CACHE_SIZE_LIMIT (2*G) 475 // Allow targets to reduce the default size of the code cache. 476 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 477 478 #include CPU_HEADER(globalDefinitions) 479 480 // To assure the IRIW property on processors that are not multiple copy 481 // atomic, sync instructions must be issued between volatile reads to 482 // assure their ordering, instead of after volatile stores. 483 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 484 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 485 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC 486 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true; 487 #else 488 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 489 #endif 490 491 // The expected size in bytes of a cache line, used to pad data structures. 492 #ifndef DEFAULT_CACHE_LINE_SIZE 493 #define DEFAULT_CACHE_LINE_SIZE 64 494 #endif 495 496 497 //---------------------------------------------------------------------------------------------------- 498 // Utility macros for compilers 499 // used to silence compiler warnings 500 501 #define Unused_Variable(var) var 502 503 504 //---------------------------------------------------------------------------------------------------- 505 // Miscellaneous 506 507 // 6302670 Eliminate Hotspot __fabsf dependency 508 // All fabs() callers should call this function instead, which will implicitly 509 // convert the operand to double, avoiding a dependency on __fabsf which 510 // doesn't exist in early versions of Solaris 8. 511 inline double fabsd(double value) { 512 return fabs(value); 513 } 514 515 // Returns numerator/denominator as percentage value from 0 to 100. If denominator 516 // is zero, return 0.0. 517 template<typename T> 518 inline double percent_of(T numerator, T denominator) { 519 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 520 } 521 522 //---------------------------------------------------------------------------------------------------- 523 // Special casts 524 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern 525 typedef union { 526 jfloat f; 527 jint i; 528 } FloatIntConv; 529 530 typedef union { 531 jdouble d; 532 jlong l; 533 julong ul; 534 } DoubleLongConv; 535 536 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 537 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 538 539 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 540 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 541 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 542 543 inline jint low (jlong value) { return jint(value); } 544 inline jint high(jlong value) { return jint(value >> 32); } 545 546 // the fancy casts are a hopefully portable way 547 // to do unsigned 32 to 64 bit type conversion 548 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 549 *value |= (jlong)(julong)(juint)low; } 550 551 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 552 *value |= (jlong)high << 32; } 553 554 inline jlong jlong_from(jint h, jint l) { 555 jlong result = 0; // initialization to avoid warning 556 set_high(&result, h); 557 set_low(&result, l); 558 return result; 559 } 560 561 union jlong_accessor { 562 jint words[2]; 563 jlong long_value; 564 }; 565 566 void basic_types_init(); // cannot define here; uses assert 567 568 569 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 570 enum BasicType { 571 T_BOOLEAN = 4, 572 T_CHAR = 5, 573 T_FLOAT = 6, 574 T_DOUBLE = 7, 575 T_BYTE = 8, 576 T_SHORT = 9, 577 T_INT = 10, 578 T_LONG = 11, 579 T_OBJECT = 12, 580 T_ARRAY = 13, 581 T_VOID = 14, 582 T_ADDRESS = 15, 583 T_NARROWOOP = 16, 584 T_METADATA = 17, 585 T_NARROWKLASS = 18, 586 T_CONFLICT = 19, // for stack value type with conflicting contents 587 T_ILLEGAL = 99 588 }; 589 590 inline bool is_java_primitive(BasicType t) { 591 return T_BOOLEAN <= t && t <= T_LONG; 592 } 593 594 inline bool is_subword_type(BasicType t) { 595 // these guys are processed exactly like T_INT in calling sequences: 596 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 597 } 598 599 inline bool is_signed_subword_type(BasicType t) { 600 return (t == T_BYTE || t == T_SHORT); 601 } 602 603 inline bool is_reference_type(BasicType t) { 604 return (t == T_OBJECT || t == T_ARRAY); 605 } 606 607 // Convert a char from a classfile signature to a BasicType 608 inline BasicType char2type(char c) { 609 switch( c ) { 610 case 'B': return T_BYTE; 611 case 'C': return T_CHAR; 612 case 'D': return T_DOUBLE; 613 case 'F': return T_FLOAT; 614 case 'I': return T_INT; 615 case 'J': return T_LONG; 616 case 'S': return T_SHORT; 617 case 'Z': return T_BOOLEAN; 618 case 'V': return T_VOID; 619 case 'L': return T_OBJECT; 620 case '[': return T_ARRAY; 621 } 622 return T_ILLEGAL; 623 } 624 625 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 626 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 627 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 628 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 629 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 630 extern BasicType name2type(const char* name); 631 632 // Auxiliary math routines 633 // least common multiple 634 extern size_t lcm(size_t a, size_t b); 635 636 637 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 638 enum BasicTypeSize { 639 T_BOOLEAN_size = 1, 640 T_CHAR_size = 1, 641 T_FLOAT_size = 1, 642 T_DOUBLE_size = 2, 643 T_BYTE_size = 1, 644 T_SHORT_size = 1, 645 T_INT_size = 1, 646 T_LONG_size = 2, 647 T_OBJECT_size = 1, 648 T_ARRAY_size = 1, 649 T_NARROWOOP_size = 1, 650 T_NARROWKLASS_size = 1, 651 T_VOID_size = 0 652 }; 653 654 655 // maps a BasicType to its instance field storage type: 656 // all sub-word integral types are widened to T_INT 657 extern BasicType type2field[T_CONFLICT+1]; 658 extern BasicType type2wfield[T_CONFLICT+1]; 659 660 661 // size in bytes 662 enum ArrayElementSize { 663 T_BOOLEAN_aelem_bytes = 1, 664 T_CHAR_aelem_bytes = 2, 665 T_FLOAT_aelem_bytes = 4, 666 T_DOUBLE_aelem_bytes = 8, 667 T_BYTE_aelem_bytes = 1, 668 T_SHORT_aelem_bytes = 2, 669 T_INT_aelem_bytes = 4, 670 T_LONG_aelem_bytes = 8, 671 #ifdef _LP64 672 T_OBJECT_aelem_bytes = 8, 673 T_ARRAY_aelem_bytes = 8, 674 #else 675 T_OBJECT_aelem_bytes = 4, 676 T_ARRAY_aelem_bytes = 4, 677 #endif 678 T_NARROWOOP_aelem_bytes = 4, 679 T_NARROWKLASS_aelem_bytes = 4, 680 T_VOID_aelem_bytes = 0 681 }; 682 683 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 684 #ifdef ASSERT 685 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 686 #else 687 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 688 #endif 689 690 691 // JavaValue serves as a container for arbitrary Java values. 692 693 class JavaValue { 694 695 public: 696 typedef union JavaCallValue { 697 jfloat f; 698 jdouble d; 699 jint i; 700 jlong l; 701 jobject h; 702 } JavaCallValue; 703 704 private: 705 BasicType _type; 706 JavaCallValue _value; 707 708 public: 709 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 710 711 JavaValue(jfloat value) { 712 _type = T_FLOAT; 713 _value.f = value; 714 } 715 716 JavaValue(jdouble value) { 717 _type = T_DOUBLE; 718 _value.d = value; 719 } 720 721 jfloat get_jfloat() const { return _value.f; } 722 jdouble get_jdouble() const { return _value.d; } 723 jint get_jint() const { return _value.i; } 724 jlong get_jlong() const { return _value.l; } 725 jobject get_jobject() const { return _value.h; } 726 JavaCallValue* get_value_addr() { return &_value; } 727 BasicType get_type() const { return _type; } 728 729 void set_jfloat(jfloat f) { _value.f = f;} 730 void set_jdouble(jdouble d) { _value.d = d;} 731 void set_jint(jint i) { _value.i = i;} 732 void set_jlong(jlong l) { _value.l = l;} 733 void set_jobject(jobject h) { _value.h = h;} 734 void set_type(BasicType t) { _type = t; } 735 736 jboolean get_jboolean() const { return (jboolean) (_value.i);} 737 jbyte get_jbyte() const { return (jbyte) (_value.i);} 738 jchar get_jchar() const { return (jchar) (_value.i);} 739 jshort get_jshort() const { return (jshort) (_value.i);} 740 741 }; 742 743 744 #define STACK_BIAS 0 745 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 746 // in order to extend the reach of the stack pointer. 747 #if defined(SPARC) && defined(_LP64) 748 #undef STACK_BIAS 749 #define STACK_BIAS 0x7ff 750 #endif 751 752 753 // TosState describes the top-of-stack state before and after the execution of 754 // a bytecode or method. The top-of-stack value may be cached in one or more CPU 755 // registers. The TosState corresponds to the 'machine representation' of this cached 756 // value. There's 4 states corresponding to the JAVA types int, long, float & double 757 // as well as a 5th state in case the top-of-stack value is actually on the top 758 // of stack (in memory) and thus not cached. The atos state corresponds to the itos 759 // state when it comes to machine representation but is used separately for (oop) 760 // type specific operations (e.g. verification code). 761 762 enum TosState { // describes the tos cache contents 763 btos = 0, // byte, bool tos cached 764 ztos = 1, // byte, bool tos cached 765 ctos = 2, // char tos cached 766 stos = 3, // short tos cached 767 itos = 4, // int tos cached 768 ltos = 5, // long tos cached 769 ftos = 6, // float tos cached 770 dtos = 7, // double tos cached 771 atos = 8, // object cached 772 vtos = 9, // tos not cached 773 number_of_states, 774 ilgl // illegal state: should not occur 775 }; 776 777 778 inline TosState as_TosState(BasicType type) { 779 switch (type) { 780 case T_BYTE : return btos; 781 case T_BOOLEAN: return ztos; 782 case T_CHAR : return ctos; 783 case T_SHORT : return stos; 784 case T_INT : return itos; 785 case T_LONG : return ltos; 786 case T_FLOAT : return ftos; 787 case T_DOUBLE : return dtos; 788 case T_VOID : return vtos; 789 case T_ARRAY : // fall through 790 case T_OBJECT : return atos; 791 default : return ilgl; 792 } 793 } 794 795 inline BasicType as_BasicType(TosState state) { 796 switch (state) { 797 case btos : return T_BYTE; 798 case ztos : return T_BOOLEAN; 799 case ctos : return T_CHAR; 800 case stos : return T_SHORT; 801 case itos : return T_INT; 802 case ltos : return T_LONG; 803 case ftos : return T_FLOAT; 804 case dtos : return T_DOUBLE; 805 case atos : return T_OBJECT; 806 case vtos : return T_VOID; 807 default : return T_ILLEGAL; 808 } 809 } 810 811 812 // Helper function to convert BasicType info into TosState 813 // Note: Cannot define here as it uses global constant at the time being. 814 TosState as_TosState(BasicType type); 815 816 817 // JavaThreadState keeps track of which part of the code a thread is executing in. This 818 // information is needed by the safepoint code. 819 // 820 // There are 4 essential states: 821 // 822 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 823 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 824 // _thread_in_vm : Executing in the vm 825 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 826 // 827 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 828 // a transition from one state to another. These extra states makes it possible for the safepoint code to 829 // handle certain thread_states without having to suspend the thread - making the safepoint code faster. 830 // 831 // Given a state, the xxxx_trans state can always be found by adding 1. 832 // 833 enum JavaThreadState { 834 _thread_uninitialized = 0, // should never happen (missing initialization) 835 _thread_new = 2, // just starting up, i.e., in process of being initialized 836 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 837 _thread_in_native = 4, // running in native code 838 _thread_in_native_trans = 5, // corresponding transition state 839 _thread_in_vm = 6, // running in VM 840 _thread_in_vm_trans = 7, // corresponding transition state 841 _thread_in_Java = 8, // running in Java or in stub code 842 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 843 _thread_blocked = 10, // blocked in vm 844 _thread_blocked_trans = 11, // corresponding transition state 845 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 846 }; 847 848 849 850 //---------------------------------------------------------------------------------------------------- 851 // 'Forward' declarations of frequently used classes 852 // (in order to reduce interface dependencies & reduce 853 // number of unnecessary compilations after changes) 854 855 class ClassFileStream; 856 857 class Event; 858 859 class Thread; 860 class VMThread; 861 class JavaThread; 862 class Threads; 863 864 class VM_Operation; 865 class VMOperationQueue; 866 867 class CodeBlob; 868 class CompiledMethod; 869 class nmethod; 870 class RuntimeBlob; 871 class OSRAdapter; 872 class I2CAdapter; 873 class C2IAdapter; 874 class CompiledIC; 875 class relocInfo; 876 class ScopeDesc; 877 class PcDesc; 878 879 class Recompiler; 880 class Recompilee; 881 class RecompilationPolicy; 882 class RFrame; 883 class CompiledRFrame; 884 class InterpretedRFrame; 885 886 class vframe; 887 class javaVFrame; 888 class interpretedVFrame; 889 class compiledVFrame; 890 class deoptimizedVFrame; 891 class externalVFrame; 892 class entryVFrame; 893 894 class RegisterMap; 895 896 class Mutex; 897 class Monitor; 898 class BasicLock; 899 class BasicObjectLock; 900 901 class PeriodicTask; 902 903 class JavaCallWrapper; 904 905 class oopDesc; 906 class metaDataOopDesc; 907 908 class NativeCall; 909 910 class zone; 911 912 class StubQueue; 913 914 class outputStream; 915 916 class ResourceArea; 917 918 class DebugInformationRecorder; 919 class ScopeValue; 920 class CompressedStream; 921 class DebugInfoReadStream; 922 class DebugInfoWriteStream; 923 class LocationValue; 924 class ConstantValue; 925 class IllegalValue; 926 927 class PrivilegedElement; 928 class MonitorArray; 929 930 class MonitorInfo; 931 932 class OffsetClosure; 933 class OopMapCache; 934 class InterpreterOopMap; 935 class OopMapCacheEntry; 936 class OSThread; 937 938 typedef int (*OSThreadStartFunc)(void*); 939 940 class Space; 941 942 class JavaValue; 943 class methodHandle; 944 class JavaCallArguments; 945 946 //---------------------------------------------------------------------------------------------------- 947 // Special constants for debugging 948 949 const jint badInt = -3; // generic "bad int" value 950 const intptr_t badAddressVal = -2; // generic "bad address" value 951 const intptr_t badOopVal = -1; // generic "bad oop" value 952 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 953 const int badStackSegVal = 0xCA; // value used to zap stack segments 954 const int badHandleValue = 0xBC; // value used to zap vm handle area 955 const int badResourceValue = 0xAB; // value used to zap resource area 956 const int freeBlockPad = 0xBA; // value used to pad freed blocks. 957 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 958 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 959 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 960 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 961 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 962 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 963 964 965 // (These must be implemented as #defines because C++ compilers are 966 // not obligated to inline non-integral constants!) 967 #define badAddress ((address)::badAddressVal) 968 #define badOop (cast_to_oop(::badOopVal)) 969 #define badHeapWord (::badHeapWordVal) 970 971 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 972 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 973 974 //---------------------------------------------------------------------------------------------------- 975 // Utility functions for bitfield manipulations 976 977 const intptr_t AllBits = ~0; // all bits set in a word 978 const intptr_t NoBits = 0; // no bits set in a word 979 const jlong NoLongBits = 0; // no bits set in a long 980 const intptr_t OneBit = 1; // only right_most bit set in a word 981 982 // get a word with the n.th or the right-most or left-most n bits set 983 // (note: #define used only so that they can be used in enum constant definitions) 984 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 985 #define right_n_bits(n) (nth_bit(n) - 1) 986 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 987 988 // bit-operations using a mask m 989 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 990 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 991 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 992 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 993 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 994 995 // bit-operations using the n.th bit 996 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 997 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 998 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 999 1000 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 1001 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 1002 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 1003 } 1004 1005 1006 //---------------------------------------------------------------------------------------------------- 1007 // Utility functions for integers 1008 1009 // Avoid use of global min/max macros which may cause unwanted double 1010 // evaluation of arguments. 1011 #ifdef max 1012 #undef max 1013 #endif 1014 1015 #ifdef min 1016 #undef min 1017 #endif 1018 1019 // It is necessary to use templates here. Having normal overloaded 1020 // functions does not work because it is necessary to provide both 32- 1021 // and 64-bit overloaded functions, which does not work, and having 1022 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 1023 // will be even more error-prone than macros. 1024 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 1025 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 1026 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 1027 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 1028 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 1029 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 1030 1031 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 1032 1033 // true if x is a power of 2, false otherwise 1034 inline bool is_power_of_2(intptr_t x) { 1035 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits)); 1036 } 1037 1038 // long version of is_power_of_2 1039 inline bool is_power_of_2_long(jlong x) { 1040 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits)); 1041 } 1042 1043 // Returns largest i such that 2^i <= x. 1044 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 1045 // If x == 0, the function returns -1. 1046 inline int log2_intptr(intptr_t x) { 1047 int i = -1; 1048 uintptr_t p = 1; 1049 while (p != 0 && p <= (uintptr_t)x) { 1050 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1051 i++; p *= 2; 1052 } 1053 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1054 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 1055 return i; 1056 } 1057 1058 //* largest i such that 2^i <= x 1059 // A negative value of 'x' will return '63' 1060 inline int log2_long(jlong x) { 1061 int i = -1; 1062 julong p = 1; 1063 while (p != 0 && p <= (julong)x) { 1064 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1065 i++; p *= 2; 1066 } 1067 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1068 // (if p = 0 then overflow occurred and i = 63) 1069 return i; 1070 } 1071 1072 //* the argument must be exactly a power of 2 1073 inline int exact_log2(intptr_t x) { 1074 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x); 1075 return log2_intptr(x); 1076 } 1077 1078 //* the argument must be exactly a power of 2 1079 inline int exact_log2_long(jlong x) { 1080 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x); 1081 return log2_long(x); 1082 } 1083 1084 inline bool is_odd (intx x) { return x & 1; } 1085 inline bool is_even(intx x) { return !is_odd(x); } 1086 1087 // "to" should be greater than "from." 1088 inline intx byte_size(void* from, void* to) { 1089 return (address)to - (address)from; 1090 } 1091 1092 //---------------------------------------------------------------------------------------------------- 1093 // Avoid non-portable casts with these routines (DEPRECATED) 1094 1095 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE 1096 // Bytes is optimized machine-specifically and may be much faster then the portable routines below. 1097 1098 // Given sequence of four bytes, build into a 32-bit word 1099 // following the conventions used in class files. 1100 // On the 386, this could be realized with a simple address cast. 1101 // 1102 1103 // This routine takes eight bytes: 1104 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1105 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 )) 1106 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 )) 1107 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 )) 1108 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 )) 1109 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 )) 1110 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 )) 1111 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 )) 1112 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 )); 1113 } 1114 1115 // This routine takes four bytes: 1116 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1117 return (( u4(c1) << 24 ) & 0xff000000) 1118 | (( u4(c2) << 16 ) & 0x00ff0000) 1119 | (( u4(c3) << 8 ) & 0x0000ff00) 1120 | (( u4(c4) << 0 ) & 0x000000ff); 1121 } 1122 1123 // And this one works if the four bytes are contiguous in memory: 1124 inline u4 build_u4_from( u1* p ) { 1125 return build_u4_from( p[0], p[1], p[2], p[3] ); 1126 } 1127 1128 // Ditto for two-byte ints: 1129 inline u2 build_u2_from( u1 c1, u1 c2 ) { 1130 return u2((( u2(c1) << 8 ) & 0xff00) 1131 | (( u2(c2) << 0 ) & 0x00ff)); 1132 } 1133 1134 // And this one works if the two bytes are contiguous in memory: 1135 inline u2 build_u2_from( u1* p ) { 1136 return build_u2_from( p[0], p[1] ); 1137 } 1138 1139 // Ditto for floats: 1140 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1141 u4 u = build_u4_from( c1, c2, c3, c4 ); 1142 return *(jfloat*)&u; 1143 } 1144 1145 inline jfloat build_float_from( u1* p ) { 1146 u4 u = build_u4_from( p ); 1147 return *(jfloat*)&u; 1148 } 1149 1150 1151 // now (64-bit) longs 1152 1153 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1154 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 )) 1155 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 )) 1156 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 )) 1157 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 )) 1158 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 )) 1159 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 )) 1160 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 )) 1161 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 )); 1162 } 1163 1164 inline jlong build_long_from( u1* p ) { 1165 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] ); 1166 } 1167 1168 1169 // Doubles, too! 1170 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1171 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 ); 1172 return *(jdouble*)&u; 1173 } 1174 1175 inline jdouble build_double_from( u1* p ) { 1176 jlong u = build_long_from( p ); 1177 return *(jdouble*)&u; 1178 } 1179 1180 1181 // Portable routines to go the other way: 1182 1183 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) { 1184 c1 = u1(x >> 8); 1185 c2 = u1(x); 1186 } 1187 1188 inline void explode_short_to( u2 x, u1* p ) { 1189 explode_short_to( x, p[0], p[1]); 1190 } 1191 1192 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) { 1193 c1 = u1(x >> 24); 1194 c2 = u1(x >> 16); 1195 c3 = u1(x >> 8); 1196 c4 = u1(x); 1197 } 1198 1199 inline void explode_int_to( u4 x, u1* p ) { 1200 explode_int_to( x, p[0], p[1], p[2], p[3]); 1201 } 1202 1203 1204 // Pack and extract shorts to/from ints: 1205 1206 inline int extract_low_short_from_int(jint x) { 1207 return x & 0xffff; 1208 } 1209 1210 inline int extract_high_short_from_int(jint x) { 1211 return (x >> 16) & 0xffff; 1212 } 1213 1214 inline int build_int_from_shorts( jushort low, jushort high ) { 1215 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1216 } 1217 1218 // Convert pointer to intptr_t, for use in printing pointers. 1219 inline intptr_t p2i(const void * p) { 1220 return (intptr_t) p; 1221 } 1222 1223 // swap a & b 1224 template<class T> static void swap(T& a, T& b) { 1225 T tmp = a; 1226 a = b; 1227 b = tmp; 1228 } 1229 1230 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1231 1232 //---------------------------------------------------------------------------------------------------- 1233 // Sum and product which can never overflow: they wrap, just like the 1234 // Java operations. Note that we don't intend these to be used for 1235 // general-purpose arithmetic: their purpose is to emulate Java 1236 // operations. 1237 1238 // The goal of this code to avoid undefined or implementation-defined 1239 // behavior. The use of an lvalue to reference cast is explicitly 1240 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1241 // 15 in C++03] 1242 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1243 inline TYPE NAME (TYPE in1, TYPE in2) { \ 1244 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1245 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1246 return reinterpret_cast<TYPE&>(ures); \ 1247 } 1248 1249 JAVA_INTEGER_OP(+, java_add, jint, juint) 1250 JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1251 JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1252 JAVA_INTEGER_OP(+, java_add, jlong, julong) 1253 JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1254 JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1255 1256 #undef JAVA_INTEGER_OP 1257 1258 // Dereference vptr 1259 // All C++ compilers that we know of have the vtbl pointer in the first 1260 // word. If there are exceptions, this function needs to be made compiler 1261 // specific. 1262 static inline void* dereference_vptr(const void* addr) { 1263 return *(void**)addr; 1264 } 1265 1266 //---------------------------------------------------------------------------------------------------- 1267 // String type aliases used by command line flag declarations and 1268 // processing utilities. 1269 1270 typedef const char* ccstr; 1271 typedef const char* ccstrlist; // represents string arguments which accumulate 1272 1273 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP