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 UINT64_FORMAT_HEX_W(width) "%" #width PRIx64 71 #define INT64_FORMAT_W(width) "%" #width PRId64 72 #define UINT64_FORMAT_W(width) "%" #width PRIu64 73 74 #define PTR64_FORMAT "0x%016" PRIx64 75 76 // Format jlong, if necessary 77 #ifndef JLONG_FORMAT 78 #define JLONG_FORMAT INT64_FORMAT 79 #endif 80 #ifndef JULONG_FORMAT 81 #define JULONG_FORMAT UINT64_FORMAT 82 #endif 83 #ifndef JULONG_FORMAT_X 84 #define JULONG_FORMAT_X UINT64_FORMAT_X 85 #endif 86 87 // Format pointers which change size between 32- and 64-bit. 88 #ifdef _LP64 89 #define INTPTR_FORMAT "0x%016" PRIxPTR 90 #define PTR_FORMAT "0x%016" PRIxPTR 91 #else // !_LP64 92 #define INTPTR_FORMAT "0x%08" PRIxPTR 93 #define PTR_FORMAT "0x%08" PRIxPTR 94 #endif // _LP64 95 96 // Format pointers without leading zeros 97 #define INTPTRNZ_FORMAT "0x%" PRIxPTR 98 99 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR 100 101 #define SSIZE_FORMAT "%" PRIdPTR 102 #define SIZE_FORMAT "%" PRIuPTR 103 #define SIZE_FORMAT_HEX "0x%" PRIxPTR 104 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR 105 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR 106 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR 107 108 #define INTX_FORMAT "%" PRIdPTR 109 #define UINTX_FORMAT "%" PRIuPTR 110 #define INTX_FORMAT_W(width) "%" #width PRIdPTR 111 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR 112 113 //---------------------------------------------------------------------------------------------------- 114 // Constants 115 116 const int LogBytesPerShort = 1; 117 const int LogBytesPerInt = 2; 118 #ifdef _LP64 119 const int LogBytesPerWord = 3; 120 #else 121 const int LogBytesPerWord = 2; 122 #endif 123 const int LogBytesPerLong = 3; 124 125 const int BytesPerShort = 1 << LogBytesPerShort; 126 const int BytesPerInt = 1 << LogBytesPerInt; 127 const int BytesPerWord = 1 << LogBytesPerWord; 128 const int BytesPerLong = 1 << LogBytesPerLong; 129 130 const int LogBitsPerByte = 3; 131 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort; 132 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt; 133 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord; 134 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong; 135 136 const int BitsPerByte = 1 << LogBitsPerByte; 137 const int BitsPerShort = 1 << LogBitsPerShort; 138 const int BitsPerInt = 1 << LogBitsPerInt; 139 const int BitsPerWord = 1 << LogBitsPerWord; 140 const int BitsPerLong = 1 << LogBitsPerLong; 141 142 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1; 143 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1; 144 145 const int WordsPerLong = 2; // Number of stack entries for longs 146 147 const int oopSize = sizeof(char*); // Full-width oop 148 extern int heapOopSize; // Oop within a java object 149 const int wordSize = sizeof(char*); 150 const int longSize = sizeof(jlong); 151 const int jintSize = sizeof(jint); 152 const int size_tSize = sizeof(size_t); 153 154 const int BytesPerOop = BytesPerWord; // Full-width oop 155 156 extern int LogBytesPerHeapOop; // Oop within a java object 157 extern int LogBitsPerHeapOop; 158 extern int BytesPerHeapOop; 159 extern int BitsPerHeapOop; 160 161 const int BitsPerJavaInteger = 32; 162 const int BitsPerJavaLong = 64; 163 const int BitsPerSize_t = size_tSize * BitsPerByte; 164 165 // Size of a char[] needed to represent a jint as a string in decimal. 166 const int jintAsStringSize = 12; 167 168 // An opaque struct of heap-word width, so that HeapWord* can be a generic 169 // pointer into the heap. We require that object sizes be measured in 170 // units of heap words, so that that 171 // HeapWord* hw; 172 // hw += oop(hw)->foo(); 173 // works, where foo is a method (like size or scavenge) that returns the 174 // object size. 175 class HeapWord { 176 friend class VMStructs; 177 private: 178 char* i; 179 #ifndef PRODUCT 180 public: 181 char* value() { return i; } 182 #endif 183 }; 184 185 // Analogous opaque struct for metadata allocated from 186 // metaspaces. 187 class MetaWord { 188 private: 189 char* i; 190 }; 191 192 // HeapWordSize must be 2^LogHeapWordSize. 193 const int HeapWordSize = sizeof(HeapWord); 194 #ifdef _LP64 195 const int LogHeapWordSize = 3; 196 #else 197 const int LogHeapWordSize = 2; 198 #endif 199 const int HeapWordsPerLong = BytesPerLong / HeapWordSize; 200 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize; 201 202 // The minimum number of native machine words necessary to contain "byte_size" 203 // bytes. 204 inline size_t heap_word_size(size_t byte_size) { 205 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize; 206 } 207 208 //------------------------------------------- 209 // Constant for jlong (standardized by C++11) 210 211 // Build a 64bit integer constant 212 #define CONST64(x) (x ## LL) 213 #define UCONST64(x) (x ## ULL) 214 215 const jlong min_jlong = CONST64(0x8000000000000000); 216 const jlong max_jlong = CONST64(0x7fffffffffffffff); 217 218 const size_t K = 1024; 219 const size_t M = K*K; 220 const size_t G = M*K; 221 const size_t HWperKB = K / sizeof(HeapWord); 222 223 // Constants for converting from a base unit to milli-base units. For 224 // example from seconds to milliseconds and microseconds 225 226 const int MILLIUNITS = 1000; // milli units per base unit 227 const int MICROUNITS = 1000000; // micro units per base unit 228 const int NANOUNITS = 1000000000; // nano units per base unit 229 230 const jlong NANOSECS_PER_SEC = CONST64(1000000000); 231 const jint NANOSECS_PER_MILLISEC = 1000000; 232 233 inline const char* proper_unit_for_byte_size(size_t s) { 234 #ifdef _LP64 235 if (s >= 10*G) { 236 return "G"; 237 } 238 #endif 239 if (s >= 10*M) { 240 return "M"; 241 } else if (s >= 10*K) { 242 return "K"; 243 } else { 244 return "B"; 245 } 246 } 247 248 template <class T> 249 inline T byte_size_in_proper_unit(T s) { 250 #ifdef _LP64 251 if (s >= 10*G) { 252 return (T)(s/G); 253 } 254 #endif 255 if (s >= 10*M) { 256 return (T)(s/M); 257 } else if (s >= 10*K) { 258 return (T)(s/K); 259 } else { 260 return s; 261 } 262 } 263 264 inline const char* exact_unit_for_byte_size(size_t s) { 265 #ifdef _LP64 266 if (s >= G && (s % G) == 0) { 267 return "G"; 268 } 269 #endif 270 if (s >= M && (s % M) == 0) { 271 return "M"; 272 } 273 if (s >= K && (s % K) == 0) { 274 return "K"; 275 } 276 return "B"; 277 } 278 279 inline size_t byte_size_in_exact_unit(size_t s) { 280 #ifdef _LP64 281 if (s >= G && (s % G) == 0) { 282 return s / G; 283 } 284 #endif 285 if (s >= M && (s % M) == 0) { 286 return s / M; 287 } 288 if (s >= K && (s % K) == 0) { 289 return s / K; 290 } 291 return s; 292 } 293 294 //---------------------------------------------------------------------------------------------------- 295 // VM type definitions 296 297 // intx and uintx are the 'extended' int and 'extended' unsigned int types; 298 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 299 300 typedef intptr_t intx; 301 typedef uintptr_t uintx; 302 303 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 304 const intx max_intx = (uintx)min_intx - 1; 305 const uintx max_uintx = (uintx)-1; 306 307 // Table of values: 308 // sizeof intx 4 8 309 // min_intx 0x80000000 0x8000000000000000 310 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 311 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 312 313 typedef unsigned int uint; NEEDS_CLEANUP 314 315 316 //---------------------------------------------------------------------------------------------------- 317 // Java type definitions 318 319 // All kinds of 'plain' byte addresses 320 typedef signed char s_char; 321 typedef unsigned char u_char; 322 typedef u_char* address; 323 typedef uintptr_t address_word; // unsigned integer which will hold a pointer 324 // except for some implementations of a C++ 325 // linkage pointer to function. Should never 326 // need one of those to be placed in this 327 // type anyway. 328 329 // Utility functions to "portably" (?) bit twiddle pointers 330 // Where portable means keep ANSI C++ compilers quiet 331 332 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 333 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 334 335 // Utility functions to "portably" make cast to/from function pointers. 336 337 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 338 inline address_word castable_address(address x) { return address_word(x) ; } 339 inline address_word castable_address(void* x) { return address_word(x) ; } 340 341 // Pointer subtraction. 342 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 343 // the range we might need to find differences from one end of the heap 344 // to the other. 345 // A typical use might be: 346 // if (pointer_delta(end(), top()) >= size) { 347 // // enough room for an object of size 348 // ... 349 // and then additions like 350 // ... top() + size ... 351 // are safe because we know that top() is at least size below end(). 352 inline size_t pointer_delta(const volatile void* left, 353 const volatile void* right, 354 size_t element_size) { 355 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 356 } 357 358 // A version specialized for HeapWord*'s. 359 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 360 return pointer_delta(left, right, sizeof(HeapWord)); 361 } 362 // A version specialized for MetaWord*'s. 363 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 364 return pointer_delta(left, right, sizeof(MetaWord)); 365 } 366 367 // 368 // ANSI C++ does not allow casting from one pointer type to a function pointer 369 // directly without at best a warning. This macro accomplishes it silently 370 // In every case that is present at this point the value be cast is a pointer 371 // to a C linkage function. In some case the type used for the cast reflects 372 // that linkage and a picky compiler would not complain. In other cases because 373 // there is no convenient place to place a typedef with extern C linkage (i.e 374 // a platform dependent header file) it doesn't. At this point no compiler seems 375 // picky enough to catch these instances (which are few). It is possible that 376 // using templates could fix these for all cases. This use of templates is likely 377 // so far from the middle of the road that it is likely to be problematic in 378 // many C++ compilers. 379 // 380 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 381 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 382 383 // Unsigned byte types for os and stream.hpp 384 385 // Unsigned one, two, four and eigth byte quantities used for describing 386 // the .class file format. See JVM book chapter 4. 387 388 typedef jubyte u1; 389 typedef jushort u2; 390 typedef juint u4; 391 typedef julong u8; 392 393 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 394 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 395 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 396 const julong max_julong = (julong)-1; // 0xFF....FF largest julong 397 398 typedef jbyte s1; 399 typedef jshort s2; 400 typedef jint s4; 401 typedef jlong s8; 402 403 const jbyte min_jbyte = -(1 << 7); // smallest jbyte 404 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 405 const jshort min_jshort = -(1 << 15); // smallest jshort 406 const jshort max_jshort = (1 << 15) - 1; // largest jshort 407 408 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 409 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 410 411 //---------------------------------------------------------------------------------------------------- 412 // JVM spec restrictions 413 414 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 415 416 //---------------------------------------------------------------------------------------------------- 417 // Default and minimum StringTable and SymbolTable size values 418 // Must be a power of 2 419 420 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 421 const size_t minimumStringTableSize = 128; 422 423 const size_t defaultSymbolTableSize = 32768; // 2^15 424 const size_t minimumSymbolTableSize = 1024; 425 426 427 //---------------------------------------------------------------------------------------------------- 428 // HotSwap - for JVMTI aka Class File Replacement and PopFrame 429 // 430 // Determines whether on-the-fly class replacement and frame popping are enabled. 431 432 #define HOTSWAP 433 434 //---------------------------------------------------------------------------------------------------- 435 // Object alignment, in units of HeapWords. 436 // 437 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 438 // reference fields can be naturally aligned. 439 440 extern int MinObjAlignment; 441 extern int MinObjAlignmentInBytes; 442 extern int MinObjAlignmentInBytesMask; 443 444 extern int LogMinObjAlignment; 445 extern int LogMinObjAlignmentInBytes; 446 447 const int LogKlassAlignmentInBytes = 3; 448 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 449 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 450 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 451 452 // Maximal size of heap where unscaled compression can be used. Also upper bound 453 // for heap placement: 4GB. 454 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 455 // Maximal size of heap where compressed oops can be used. Also upper bound for heap 456 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 457 extern uint64_t OopEncodingHeapMax; 458 459 // Maximal size of compressed class space. Above this limit compression is not possible. 460 // Also upper bound for placement of zero based class space. (Class space is further limited 461 // to be < 3G, see arguments.cpp.) 462 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 463 464 // Machine dependent stuff 465 466 // The maximum size of the code cache. Can be overridden by targets. 467 #define CODE_CACHE_SIZE_LIMIT (2*G) 468 // Allow targets to reduce the default size of the code cache. 469 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 470 471 #include CPU_HEADER(globalDefinitions) 472 473 // To assure the IRIW property on processors that are not multiple copy 474 // atomic, sync instructions must be issued between volatile reads to 475 // assure their ordering, instead of after volatile stores. 476 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 477 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 478 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC 479 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true; 480 #else 481 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 482 #endif 483 484 // The expected size in bytes of a cache line, used to pad data structures. 485 #ifndef DEFAULT_CACHE_LINE_SIZE 486 #define DEFAULT_CACHE_LINE_SIZE 64 487 #endif 488 489 490 //---------------------------------------------------------------------------------------------------- 491 // Utility macros for compilers 492 // used to silence compiler warnings 493 494 #define Unused_Variable(var) var 495 496 497 //---------------------------------------------------------------------------------------------------- 498 // Miscellaneous 499 500 // 6302670 Eliminate Hotspot __fabsf dependency 501 // All fabs() callers should call this function instead, which will implicitly 502 // convert the operand to double, avoiding a dependency on __fabsf which 503 // doesn't exist in early versions of Solaris 8. 504 inline double fabsd(double value) { 505 return fabs(value); 506 } 507 508 // Returns numerator/denominator as percentage value from 0 to 100. If denominator 509 // is zero, return 0.0. 510 template<typename T> 511 inline double percent_of(T numerator, T denominator) { 512 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 513 } 514 515 //---------------------------------------------------------------------------------------------------- 516 // Special casts 517 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern 518 typedef union { 519 jfloat f; 520 jint i; 521 } FloatIntConv; 522 523 typedef union { 524 jdouble d; 525 jlong l; 526 julong ul; 527 } DoubleLongConv; 528 529 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 530 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 531 532 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 533 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 534 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 535 536 inline jint low (jlong value) { return jint(value); } 537 inline jint high(jlong value) { return jint(value >> 32); } 538 539 // the fancy casts are a hopefully portable way 540 // to do unsigned 32 to 64 bit type conversion 541 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 542 *value |= (jlong)(julong)(juint)low; } 543 544 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 545 *value |= (jlong)high << 32; } 546 547 inline jlong jlong_from(jint h, jint l) { 548 jlong result = 0; // initialization to avoid warning 549 set_high(&result, h); 550 set_low(&result, l); 551 return result; 552 } 553 554 union jlong_accessor { 555 jint words[2]; 556 jlong long_value; 557 }; 558 559 void basic_types_init(); // cannot define here; uses assert 560 561 562 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 563 enum BasicType { 564 T_BOOLEAN = 4, 565 T_CHAR = 5, 566 T_FLOAT = 6, 567 T_DOUBLE = 7, 568 T_BYTE = 8, 569 T_SHORT = 9, 570 T_INT = 10, 571 T_LONG = 11, 572 T_OBJECT = 12, 573 T_ARRAY = 13, 574 T_VOID = 14, 575 T_ADDRESS = 15, 576 T_NARROWOOP = 16, 577 T_METADATA = 17, 578 T_NARROWKLASS = 18, 579 T_CONFLICT = 19, // for stack value type with conflicting contents 580 T_ILLEGAL = 99 581 }; 582 583 inline bool is_java_primitive(BasicType t) { 584 return T_BOOLEAN <= t && t <= T_LONG; 585 } 586 587 inline bool is_subword_type(BasicType t) { 588 // these guys are processed exactly like T_INT in calling sequences: 589 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 590 } 591 592 inline bool is_signed_subword_type(BasicType t) { 593 return (t == T_BYTE || t == T_SHORT); 594 } 595 596 inline bool is_reference_type(BasicType t) { 597 return (t == T_OBJECT || t == T_ARRAY); 598 } 599 600 // Convert a char from a classfile signature to a BasicType 601 inline BasicType char2type(char c) { 602 switch( c ) { 603 case 'B': return T_BYTE; 604 case 'C': return T_CHAR; 605 case 'D': return T_DOUBLE; 606 case 'F': return T_FLOAT; 607 case 'I': return T_INT; 608 case 'J': return T_LONG; 609 case 'S': return T_SHORT; 610 case 'Z': return T_BOOLEAN; 611 case 'V': return T_VOID; 612 case 'L': return T_OBJECT; 613 case '[': return T_ARRAY; 614 } 615 return T_ILLEGAL; 616 } 617 618 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 619 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 620 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 621 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 622 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 623 extern BasicType name2type(const char* name); 624 625 // Auxiliary math routines 626 // least common multiple 627 extern size_t lcm(size_t a, size_t b); 628 629 630 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 631 enum BasicTypeSize { 632 T_BOOLEAN_size = 1, 633 T_CHAR_size = 1, 634 T_FLOAT_size = 1, 635 T_DOUBLE_size = 2, 636 T_BYTE_size = 1, 637 T_SHORT_size = 1, 638 T_INT_size = 1, 639 T_LONG_size = 2, 640 T_OBJECT_size = 1, 641 T_ARRAY_size = 1, 642 T_NARROWOOP_size = 1, 643 T_NARROWKLASS_size = 1, 644 T_VOID_size = 0 645 }; 646 647 648 // maps a BasicType to its instance field storage type: 649 // all sub-word integral types are widened to T_INT 650 extern BasicType type2field[T_CONFLICT+1]; 651 extern BasicType type2wfield[T_CONFLICT+1]; 652 653 654 // size in bytes 655 enum ArrayElementSize { 656 T_BOOLEAN_aelem_bytes = 1, 657 T_CHAR_aelem_bytes = 2, 658 T_FLOAT_aelem_bytes = 4, 659 T_DOUBLE_aelem_bytes = 8, 660 T_BYTE_aelem_bytes = 1, 661 T_SHORT_aelem_bytes = 2, 662 T_INT_aelem_bytes = 4, 663 T_LONG_aelem_bytes = 8, 664 #ifdef _LP64 665 T_OBJECT_aelem_bytes = 8, 666 T_ARRAY_aelem_bytes = 8, 667 #else 668 T_OBJECT_aelem_bytes = 4, 669 T_ARRAY_aelem_bytes = 4, 670 #endif 671 T_NARROWOOP_aelem_bytes = 4, 672 T_NARROWKLASS_aelem_bytes = 4, 673 T_VOID_aelem_bytes = 0 674 }; 675 676 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 677 #ifdef ASSERT 678 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 679 #else 680 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 681 #endif 682 683 684 // JavaValue serves as a container for arbitrary Java values. 685 686 class JavaValue { 687 688 public: 689 typedef union JavaCallValue { 690 jfloat f; 691 jdouble d; 692 jint i; 693 jlong l; 694 jobject h; 695 } JavaCallValue; 696 697 private: 698 BasicType _type; 699 JavaCallValue _value; 700 701 public: 702 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 703 704 JavaValue(jfloat value) { 705 _type = T_FLOAT; 706 _value.f = value; 707 } 708 709 JavaValue(jdouble value) { 710 _type = T_DOUBLE; 711 _value.d = value; 712 } 713 714 jfloat get_jfloat() const { return _value.f; } 715 jdouble get_jdouble() const { return _value.d; } 716 jint get_jint() const { return _value.i; } 717 jlong get_jlong() const { return _value.l; } 718 jobject get_jobject() const { return _value.h; } 719 JavaCallValue* get_value_addr() { return &_value; } 720 BasicType get_type() const { return _type; } 721 722 void set_jfloat(jfloat f) { _value.f = f;} 723 void set_jdouble(jdouble d) { _value.d = d;} 724 void set_jint(jint i) { _value.i = i;} 725 void set_jlong(jlong l) { _value.l = l;} 726 void set_jobject(jobject h) { _value.h = h;} 727 void set_type(BasicType t) { _type = t; } 728 729 jboolean get_jboolean() const { return (jboolean) (_value.i);} 730 jbyte get_jbyte() const { return (jbyte) (_value.i);} 731 jchar get_jchar() const { return (jchar) (_value.i);} 732 jshort get_jshort() const { return (jshort) (_value.i);} 733 734 }; 735 736 737 #define STACK_BIAS 0 738 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 739 // in order to extend the reach of the stack pointer. 740 #if defined(SPARC) && defined(_LP64) 741 #undef STACK_BIAS 742 #define STACK_BIAS 0x7ff 743 #endif 744 745 746 // TosState describes the top-of-stack state before and after the execution of 747 // a bytecode or method. The top-of-stack value may be cached in one or more CPU 748 // registers. The TosState corresponds to the 'machine representation' of this cached 749 // value. There's 4 states corresponding to the JAVA types int, long, float & double 750 // as well as a 5th state in case the top-of-stack value is actually on the top 751 // of stack (in memory) and thus not cached. The atos state corresponds to the itos 752 // state when it comes to machine representation but is used separately for (oop) 753 // type specific operations (e.g. verification code). 754 755 enum TosState { // describes the tos cache contents 756 btos = 0, // byte, bool tos cached 757 ztos = 1, // byte, bool tos cached 758 ctos = 2, // char tos cached 759 stos = 3, // short tos cached 760 itos = 4, // int tos cached 761 ltos = 5, // long tos cached 762 ftos = 6, // float tos cached 763 dtos = 7, // double tos cached 764 atos = 8, // object cached 765 vtos = 9, // tos not cached 766 number_of_states, 767 ilgl // illegal state: should not occur 768 }; 769 770 771 inline TosState as_TosState(BasicType type) { 772 switch (type) { 773 case T_BYTE : return btos; 774 case T_BOOLEAN: return ztos; 775 case T_CHAR : return ctos; 776 case T_SHORT : return stos; 777 case T_INT : return itos; 778 case T_LONG : return ltos; 779 case T_FLOAT : return ftos; 780 case T_DOUBLE : return dtos; 781 case T_VOID : return vtos; 782 case T_ARRAY : // fall through 783 case T_OBJECT : return atos; 784 default : return ilgl; 785 } 786 } 787 788 inline BasicType as_BasicType(TosState state) { 789 switch (state) { 790 case btos : return T_BYTE; 791 case ztos : return T_BOOLEAN; 792 case ctos : return T_CHAR; 793 case stos : return T_SHORT; 794 case itos : return T_INT; 795 case ltos : return T_LONG; 796 case ftos : return T_FLOAT; 797 case dtos : return T_DOUBLE; 798 case atos : return T_OBJECT; 799 case vtos : return T_VOID; 800 default : return T_ILLEGAL; 801 } 802 } 803 804 805 // Helper function to convert BasicType info into TosState 806 // Note: Cannot define here as it uses global constant at the time being. 807 TosState as_TosState(BasicType type); 808 809 810 // JavaThreadState keeps track of which part of the code a thread is executing in. This 811 // information is needed by the safepoint code. 812 // 813 // There are 4 essential states: 814 // 815 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 816 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 817 // _thread_in_vm : Executing in the vm 818 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 819 // 820 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 821 // a transition from one state to another. These extra states makes it possible for the safepoint code to 822 // handle certain thread_states without having to suspend the thread - making the safepoint code faster. 823 // 824 // Given a state, the xxxx_trans state can always be found by adding 1. 825 // 826 enum JavaThreadState { 827 _thread_uninitialized = 0, // should never happen (missing initialization) 828 _thread_new = 2, // just starting up, i.e., in process of being initialized 829 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 830 _thread_in_native = 4, // running in native code 831 _thread_in_native_trans = 5, // corresponding transition state 832 _thread_in_vm = 6, // running in VM 833 _thread_in_vm_trans = 7, // corresponding transition state 834 _thread_in_Java = 8, // running in Java or in stub code 835 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 836 _thread_blocked = 10, // blocked in vm 837 _thread_blocked_trans = 11, // corresponding transition state 838 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 839 }; 840 841 842 843 //---------------------------------------------------------------------------------------------------- 844 // 'Forward' declarations of frequently used classes 845 // (in order to reduce interface dependencies & reduce 846 // number of unnecessary compilations after changes) 847 848 class ClassFileStream; 849 850 class Event; 851 852 class Thread; 853 class VMThread; 854 class JavaThread; 855 class Threads; 856 857 class VM_Operation; 858 class VMOperationQueue; 859 860 class CodeBlob; 861 class CompiledMethod; 862 class nmethod; 863 class RuntimeBlob; 864 class OSRAdapter; 865 class I2CAdapter; 866 class C2IAdapter; 867 class CompiledIC; 868 class relocInfo; 869 class ScopeDesc; 870 class PcDesc; 871 872 class Recompiler; 873 class Recompilee; 874 class RecompilationPolicy; 875 class RFrame; 876 class CompiledRFrame; 877 class InterpretedRFrame; 878 879 class vframe; 880 class javaVFrame; 881 class interpretedVFrame; 882 class compiledVFrame; 883 class deoptimizedVFrame; 884 class externalVFrame; 885 class entryVFrame; 886 887 class RegisterMap; 888 889 class Mutex; 890 class Monitor; 891 class BasicLock; 892 class BasicObjectLock; 893 894 class PeriodicTask; 895 896 class JavaCallWrapper; 897 898 class oopDesc; 899 class metaDataOopDesc; 900 901 class NativeCall; 902 903 class zone; 904 905 class StubQueue; 906 907 class outputStream; 908 909 class ResourceArea; 910 911 class DebugInformationRecorder; 912 class ScopeValue; 913 class CompressedStream; 914 class DebugInfoReadStream; 915 class DebugInfoWriteStream; 916 class LocationValue; 917 class ConstantValue; 918 class IllegalValue; 919 920 class MonitorArray; 921 922 class MonitorInfo; 923 924 class OffsetClosure; 925 class OopMapCache; 926 class InterpreterOopMap; 927 class OopMapCacheEntry; 928 class OSThread; 929 930 typedef int (*OSThreadStartFunc)(void*); 931 932 class Space; 933 934 class JavaValue; 935 class methodHandle; 936 class JavaCallArguments; 937 938 //---------------------------------------------------------------------------------------------------- 939 // Special constants for debugging 940 941 const jint badInt = -3; // generic "bad int" value 942 const intptr_t badAddressVal = -2; // generic "bad address" value 943 const intptr_t badOopVal = -1; // generic "bad oop" value 944 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 945 const int badStackSegVal = 0xCA; // value used to zap stack segments 946 const int badHandleValue = 0xBC; // value used to zap vm handle area 947 const int badResourceValue = 0xAB; // value used to zap resource area 948 const int freeBlockPad = 0xBA; // value used to pad freed blocks. 949 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 950 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 951 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 952 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 953 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 954 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 955 956 957 // (These must be implemented as #defines because C++ compilers are 958 // not obligated to inline non-integral constants!) 959 #define badAddress ((address)::badAddressVal) 960 #define badOop (cast_to_oop(::badOopVal)) 961 #define badHeapWord (::badHeapWordVal) 962 963 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 964 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 965 966 //---------------------------------------------------------------------------------------------------- 967 // Utility functions for bitfield manipulations 968 969 const intptr_t AllBits = ~0; // all bits set in a word 970 const intptr_t NoBits = 0; // no bits set in a word 971 const jlong NoLongBits = 0; // no bits set in a long 972 const intptr_t OneBit = 1; // only right_most bit set in a word 973 974 // get a word with the n.th or the right-most or left-most n bits set 975 // (note: #define used only so that they can be used in enum constant definitions) 976 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 977 #define right_n_bits(n) (nth_bit(n) - 1) 978 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 979 980 // bit-operations using a mask m 981 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 982 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 983 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 984 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 985 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 986 987 // bit-operations using the n.th bit 988 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 989 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 990 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 991 992 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 993 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 994 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 995 } 996 997 998 //---------------------------------------------------------------------------------------------------- 999 // Utility functions for integers 1000 1001 // Avoid use of global min/max macros which may cause unwanted double 1002 // evaluation of arguments. 1003 #ifdef max 1004 #undef max 1005 #endif 1006 1007 #ifdef min 1008 #undef min 1009 #endif 1010 1011 // It is necessary to use templates here. Having normal overloaded 1012 // functions does not work because it is necessary to provide both 32- 1013 // and 64-bit overloaded functions, which does not work, and having 1014 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 1015 // will be even more error-prone than macros. 1016 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 1017 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 1018 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 1019 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 1020 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 1021 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 1022 1023 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 1024 1025 // true if x is a power of 2, false otherwise 1026 inline bool is_power_of_2(intptr_t x) { 1027 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits)); 1028 } 1029 1030 // long version of is_power_of_2 1031 inline bool is_power_of_2_long(jlong x) { 1032 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits)); 1033 } 1034 1035 // Returns largest i such that 2^i <= x. 1036 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 1037 // If x == 0, the function returns -1. 1038 inline int log2_intptr(uintptr_t x) { 1039 int i = -1; 1040 uintptr_t p = 1; 1041 while (p != 0 && p <= x) { 1042 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1043 i++; p *= 2; 1044 } 1045 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1046 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 1047 return i; 1048 } 1049 1050 //* largest i such that 2^i <= x 1051 // A negative value of 'x' will return '63' 1052 inline int log2_long(unsigned long x) { 1053 int i = -1; 1054 julong p = 1; 1055 while (p != 0 && p <= x) { 1056 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1057 i++; p *= 2; 1058 } 1059 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1060 // (if p = 0 then overflow occurred and i = 63) 1061 return i; 1062 } 1063 1064 inline int log2_intptr(intptr_t x) { 1065 return log2_intptr((uintptr_t)x); 1066 } 1067 1068 inline int log2_intptr(int x) { 1069 return log2_intptr((uintptr_t)x); 1070 } 1071 1072 inline int log2_intptr(uint x) { 1073 return log2_intptr((uintptr_t)x); 1074 } 1075 1076 inline int log2_long(jlong x) { 1077 return log2_long((unsigned long)x); 1078 } 1079 1080 //* the argument must be exactly a power of 2 1081 inline int exact_log2(intptr_t x) { 1082 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x); 1083 return log2_intptr(x); 1084 } 1085 1086 //* the argument must be exactly a power of 2 1087 inline int exact_log2_long(jlong x) { 1088 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x); 1089 return log2_long(x); 1090 } 1091 1092 inline bool is_odd (intx x) { return x & 1; } 1093 inline bool is_even(intx x) { return !is_odd(x); } 1094 1095 // abs methods which cannot overflow and so are well-defined across 1096 // the entire domain of integer types. 1097 static inline unsigned int uabs(unsigned int n) { 1098 union { 1099 unsigned int result; 1100 int value; 1101 }; 1102 result = n; 1103 if (value < 0) result = 0-result; 1104 return result; 1105 } 1106 static inline unsigned long uabs(unsigned long n) { 1107 union { 1108 unsigned long result; 1109 long value; 1110 }; 1111 result = n; 1112 if (value < 0) result = 0-result; 1113 return result; 1114 } 1115 static inline unsigned long uabs(jlong n) { return uabs((unsigned long)n); } 1116 static inline unsigned int uabs(int n) { return uabs((unsigned int)n); } 1117 1118 // "to" should be greater than "from." 1119 inline intx byte_size(void* from, void* to) { 1120 return (address)to - (address)from; 1121 } 1122 1123 //---------------------------------------------------------------------------------------------------- 1124 // Avoid non-portable casts with these routines (DEPRECATED) 1125 1126 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE 1127 // Bytes is optimized machine-specifically and may be much faster then the portable routines below. 1128 1129 // Given sequence of four bytes, build into a 32-bit word 1130 // following the conventions used in class files. 1131 // On the 386, this could be realized with a simple address cast. 1132 // 1133 1134 // This routine takes eight bytes: 1135 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1136 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 )) 1137 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 )) 1138 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 )) 1139 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 )) 1140 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 )) 1141 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 )) 1142 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 )) 1143 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 )); 1144 } 1145 1146 // This routine takes four bytes: 1147 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1148 return (( u4(c1) << 24 ) & 0xff000000) 1149 | (( u4(c2) << 16 ) & 0x00ff0000) 1150 | (( u4(c3) << 8 ) & 0x0000ff00) 1151 | (( u4(c4) << 0 ) & 0x000000ff); 1152 } 1153 1154 // And this one works if the four bytes are contiguous in memory: 1155 inline u4 build_u4_from( u1* p ) { 1156 return build_u4_from( p[0], p[1], p[2], p[3] ); 1157 } 1158 1159 // Ditto for two-byte ints: 1160 inline u2 build_u2_from( u1 c1, u1 c2 ) { 1161 return u2((( u2(c1) << 8 ) & 0xff00) 1162 | (( u2(c2) << 0 ) & 0x00ff)); 1163 } 1164 1165 // And this one works if the two bytes are contiguous in memory: 1166 inline u2 build_u2_from( u1* p ) { 1167 return build_u2_from( p[0], p[1] ); 1168 } 1169 1170 // Ditto for floats: 1171 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1172 u4 u = build_u4_from( c1, c2, c3, c4 ); 1173 return *(jfloat*)&u; 1174 } 1175 1176 inline jfloat build_float_from( u1* p ) { 1177 u4 u = build_u4_from( p ); 1178 return *(jfloat*)&u; 1179 } 1180 1181 1182 // now (64-bit) longs 1183 1184 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1185 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 )) 1186 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 )) 1187 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 )) 1188 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 )) 1189 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 )) 1190 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 )) 1191 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 )) 1192 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 )); 1193 } 1194 1195 inline jlong build_long_from( u1* p ) { 1196 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] ); 1197 } 1198 1199 1200 // Doubles, too! 1201 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1202 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 ); 1203 return *(jdouble*)&u; 1204 } 1205 1206 inline jdouble build_double_from( u1* p ) { 1207 jlong u = build_long_from( p ); 1208 return *(jdouble*)&u; 1209 } 1210 1211 1212 // Portable routines to go the other way: 1213 1214 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) { 1215 c1 = u1(x >> 8); 1216 c2 = u1(x); 1217 } 1218 1219 inline void explode_short_to( u2 x, u1* p ) { 1220 explode_short_to( x, p[0], p[1]); 1221 } 1222 1223 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) { 1224 c1 = u1(x >> 24); 1225 c2 = u1(x >> 16); 1226 c3 = u1(x >> 8); 1227 c4 = u1(x); 1228 } 1229 1230 inline void explode_int_to( u4 x, u1* p ) { 1231 explode_int_to( x, p[0], p[1], p[2], p[3]); 1232 } 1233 1234 1235 // Pack and extract shorts to/from ints: 1236 1237 inline int extract_low_short_from_int(jint x) { 1238 return x & 0xffff; 1239 } 1240 1241 inline int extract_high_short_from_int(jint x) { 1242 return (x >> 16) & 0xffff; 1243 } 1244 1245 inline int build_int_from_shorts( jushort low, jushort high ) { 1246 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1247 } 1248 1249 // Convert pointer to intptr_t, for use in printing pointers. 1250 inline intptr_t p2i(const void * p) { 1251 return (intptr_t) p; 1252 } 1253 1254 // swap a & b 1255 template<class T> static void swap(T& a, T& b) { 1256 T tmp = a; 1257 a = b; 1258 b = tmp; 1259 } 1260 1261 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1262 1263 //---------------------------------------------------------------------------------------------------- 1264 // Sum and product which can never overflow: they wrap, just like the 1265 // Java operations. Note that we don't intend these to be used for 1266 // general-purpose arithmetic: their purpose is to emulate Java 1267 // operations. 1268 1269 // The goal of this code to avoid undefined or implementation-defined 1270 // behavior. The use of an lvalue to reference cast is explicitly 1271 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1272 // 15 in C++03] 1273 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1274 inline TYPE NAME (TYPE in1, TYPE in2) { \ 1275 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1276 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1277 return reinterpret_cast<TYPE&>(ures); \ 1278 } 1279 1280 JAVA_INTEGER_OP(+, java_add, jint, juint) 1281 JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1282 JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1283 JAVA_INTEGER_OP(+, java_add, jlong, julong) 1284 JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1285 JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1286 1287 #undef JAVA_INTEGER_OP 1288 1289 // Dereference vptr 1290 // All C++ compilers that we know of have the vtbl pointer in the first 1291 // word. If there are exceptions, this function needs to be made compiler 1292 // specific. 1293 static inline void* dereference_vptr(const void* addr) { 1294 return *(void**)addr; 1295 } 1296 1297 //---------------------------------------------------------------------------------------------------- 1298 // String type aliases used by command line flag declarations and 1299 // processing utilities. 1300 1301 typedef const char* ccstr; 1302 typedef const char* ccstrlist; // represents string arguments which accumulate 1303 1304 //---------------------------------------------------------------------------------------------------- 1305 // Default hash/equals functions used by ResourceHashtable and KVHashtable 1306 1307 template<typename K> unsigned primitive_hash(const K& k) { 1308 unsigned hash = (unsigned)((uintptr_t)k); 1309 return hash ^ (hash >> 3); // just in case we're dealing with aligned ptrs 1310 } 1311 1312 template<typename K> bool primitive_equals(const K& k0, const K& k1) { 1313 return k0 == k1; 1314 } 1315 1316 1317 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP