1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 26 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 27 28 #include "utilities/compilerWarnings.hpp" 29 #include "utilities/debug.hpp" 30 #include "utilities/macros.hpp" 31 32 #include COMPILER_HEADER(utilities/globalDefinitions) 33 34 // Defaults for macros that might be defined per compiler. 35 #ifndef NOINLINE 36 #define NOINLINE 37 #endif 38 #ifndef ALWAYSINLINE 39 #define ALWAYSINLINE inline 40 #endif 41 42 #ifndef ATTRIBUTE_ALIGNED 43 #define ATTRIBUTE_ALIGNED(x) 44 #endif 45 46 // This file holds all globally used constants & types, class (forward) 47 // declarations and a few frequently used utility functions. 48 49 //---------------------------------------------------------------------------------------------------- 50 // Printf-style formatters for fixed- and variable-width types as pointers and 51 // integers. These are derived from the definitions in inttypes.h. If the platform 52 // doesn't provide appropriate definitions, they should be provided in 53 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp) 54 55 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false") 56 57 // Format 32-bit quantities. 58 #define INT32_FORMAT "%" PRId32 59 #define UINT32_FORMAT "%" PRIu32 60 #define INT32_FORMAT_W(width) "%" #width PRId32 61 #define UINT32_FORMAT_W(width) "%" #width PRIu32 62 63 #define PTR32_FORMAT "0x%08" PRIx32 64 #define PTR32_FORMAT_W(width) "0x%" #width PRIx32 65 66 // Format 64-bit quantities. 67 #define INT64_FORMAT "%" PRId64 68 #define UINT64_FORMAT "%" PRIu64 69 #define UINT64_FORMAT_X "%" PRIx64 70 #define INT64_FORMAT_W(width) "%" #width PRId64 71 #define UINT64_FORMAT_W(width) "%" #width PRIu64 72 73 #define PTR64_FORMAT "0x%016" PRIx64 74 75 // Format jlong, if necessary 76 #ifndef JLONG_FORMAT 77 #define JLONG_FORMAT INT64_FORMAT 78 #endif 79 #ifndef JULONG_FORMAT 80 #define JULONG_FORMAT UINT64_FORMAT 81 #endif 82 #ifndef JULONG_FORMAT_X 83 #define JULONG_FORMAT_X UINT64_FORMAT_X 84 #endif 85 86 // Format pointers which change size between 32- and 64-bit. 87 #ifdef _LP64 88 #define INTPTR_FORMAT "0x%016" PRIxPTR 89 #define PTR_FORMAT "0x%016" PRIxPTR 90 #else // !_LP64 91 #define INTPTR_FORMAT "0x%08" PRIxPTR 92 #define PTR_FORMAT "0x%08" PRIxPTR 93 #endif // _LP64 94 95 // Format pointers without leading zeros 96 #define INTPTRNZ_FORMAT "0x%" PRIxPTR 97 98 #define INTPTR_FORMAT_W(width) "%" #width PRIxPTR 99 100 #define SSIZE_FORMAT "%" PRIdPTR 101 #define SIZE_FORMAT "%" PRIuPTR 102 #define SIZE_FORMAT_HEX "0x%" PRIxPTR 103 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR 104 #define SIZE_FORMAT_W(width) "%" #width PRIuPTR 105 #define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR 106 107 #define INTX_FORMAT "%" PRIdPTR 108 #define UINTX_FORMAT "%" PRIuPTR 109 #define INTX_FORMAT_W(width) "%" #width PRIdPTR 110 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR 111 112 //---------------------------------------------------------------------------------------------------- 113 // Constants 114 115 const int LogBytesPerShort = 1; 116 const int LogBytesPerInt = 2; 117 #ifdef _LP64 118 const int LogBytesPerWord = 3; 119 #else 120 const int LogBytesPerWord = 2; 121 #endif 122 const int LogBytesPerLong = 3; 123 124 const int BytesPerShort = 1 << LogBytesPerShort; 125 const int BytesPerInt = 1 << LogBytesPerInt; 126 const int BytesPerWord = 1 << LogBytesPerWord; 127 const int BytesPerLong = 1 << LogBytesPerLong; 128 129 const int LogBitsPerByte = 3; 130 const int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort; 131 const int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt; 132 const int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord; 133 const int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong; 134 135 const int BitsPerByte = 1 << LogBitsPerByte; 136 const int BitsPerShort = 1 << LogBitsPerShort; 137 const int BitsPerInt = 1 << LogBitsPerInt; 138 const int BitsPerWord = 1 << LogBitsPerWord; 139 const int BitsPerLong = 1 << LogBitsPerLong; 140 141 const int WordAlignmentMask = (1 << LogBytesPerWord) - 1; 142 const int LongAlignmentMask = (1 << LogBytesPerLong) - 1; 143 144 const int WordsPerLong = 2; // Number of stack entries for longs 145 146 const int oopSize = sizeof(char*); // Full-width oop 147 extern int heapOopSize; // Oop within a java object 148 const int wordSize = sizeof(char*); 149 const int longSize = sizeof(jlong); 150 const int jintSize = sizeof(jint); 151 const int size_tSize = sizeof(size_t); 152 153 const int BytesPerOop = BytesPerWord; // Full-width oop 154 155 extern int LogBytesPerHeapOop; // Oop within a java object 156 extern int LogBitsPerHeapOop; 157 extern int BytesPerHeapOop; 158 extern int BitsPerHeapOop; 159 160 const int BitsPerJavaInteger = 32; 161 const int BitsPerJavaLong = 64; 162 const int BitsPerSize_t = size_tSize * BitsPerByte; 163 164 // Size of a char[] needed to represent a jint as a string in decimal. 165 const int jintAsStringSize = 12; 166 167 // In fact this should be 168 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 169 // see os::set_memory_serialize_page() 170 #ifdef _LP64 171 const int SerializePageShiftCount = 4; 172 #else 173 const int SerializePageShiftCount = 3; 174 #endif 175 176 // An opaque struct of heap-word width, so that HeapWord* can be a generic 177 // pointer into the heap. We require that object sizes be measured in 178 // units of heap words, so that that 179 // HeapWord* hw; 180 // hw += oop(hw)->foo(); 181 // works, where foo is a method (like size or scavenge) that returns the 182 // object size. 183 class HeapWord { 184 friend class VMStructs; 185 private: 186 char* i; 187 #ifndef PRODUCT 188 public: 189 char* value() { return i; } 190 #endif 191 }; 192 193 // Analogous opaque struct for metadata allocated from 194 // metaspaces. 195 class MetaWord { 196 private: 197 char* i; 198 }; 199 200 // HeapWordSize must be 2^LogHeapWordSize. 201 const int HeapWordSize = sizeof(HeapWord); 202 #ifdef _LP64 203 const int LogHeapWordSize = 3; 204 #else 205 const int LogHeapWordSize = 2; 206 #endif 207 const int HeapWordsPerLong = BytesPerLong / HeapWordSize; 208 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize; 209 210 // The minimum number of native machine words necessary to contain "byte_size" 211 // bytes. 212 inline size_t heap_word_size(size_t byte_size) { 213 return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize; 214 } 215 216 //------------------------------------------- 217 // Constant for jlong (standardized by C++11) 218 219 // Build a 64bit integer constant 220 #define CONST64(x) (x ## LL) 221 #define UCONST64(x) (x ## ULL) 222 223 const jlong min_jlong = CONST64(0x8000000000000000); 224 const jlong max_jlong = CONST64(0x7fffffffffffffff); 225 226 const size_t K = 1024; 227 const size_t M = K*K; 228 const size_t G = M*K; 229 const size_t HWperKB = K / sizeof(HeapWord); 230 231 // Constants for converting from a base unit to milli-base units. For 232 // example from seconds to milliseconds and microseconds 233 234 const int MILLIUNITS = 1000; // milli units per base unit 235 const int MICROUNITS = 1000000; // micro units per base unit 236 const int NANOUNITS = 1000000000; // nano units per base unit 237 238 const jlong NANOSECS_PER_SEC = CONST64(1000000000); 239 const jint NANOSECS_PER_MILLISEC = 1000000; 240 241 inline const char* proper_unit_for_byte_size(size_t s) { 242 #ifdef _LP64 243 if (s >= 10*G) { 244 return "G"; 245 } 246 #endif 247 if (s >= 10*M) { 248 return "M"; 249 } else if (s >= 10*K) { 250 return "K"; 251 } else { 252 return "B"; 253 } 254 } 255 256 template <class T> 257 inline T byte_size_in_proper_unit(T s) { 258 #ifdef _LP64 259 if (s >= 10*G) { 260 return (T)(s/G); 261 } 262 #endif 263 if (s >= 10*M) { 264 return (T)(s/M); 265 } else if (s >= 10*K) { 266 return (T)(s/K); 267 } else { 268 return s; 269 } 270 } 271 272 inline const char* exact_unit_for_byte_size(size_t s) { 273 #ifdef _LP64 274 if (s >= G && (s % G) == 0) { 275 return "G"; 276 } 277 #endif 278 if (s >= M && (s % M) == 0) { 279 return "M"; 280 } 281 if (s >= K && (s % K) == 0) { 282 return "K"; 283 } 284 return "B"; 285 } 286 287 inline size_t byte_size_in_exact_unit(size_t s) { 288 #ifdef _LP64 289 if (s >= G && (s % G) == 0) { 290 return s / G; 291 } 292 #endif 293 if (s >= M && (s % M) == 0) { 294 return s / M; 295 } 296 if (s >= K && (s % K) == 0) { 297 return s / K; 298 } 299 return s; 300 } 301 302 //---------------------------------------------------------------------------------------------------- 303 // VM type definitions 304 305 // intx and uintx are the 'extended' int and 'extended' unsigned int types; 306 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 307 308 typedef intptr_t intx; 309 typedef uintptr_t uintx; 310 311 const intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 312 const intx max_intx = (uintx)min_intx - 1; 313 const uintx max_uintx = (uintx)-1; 314 315 // Table of values: 316 // sizeof intx 4 8 317 // min_intx 0x80000000 0x8000000000000000 318 // max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 319 // max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 320 321 typedef unsigned int uint; NEEDS_CLEANUP 322 323 324 //---------------------------------------------------------------------------------------------------- 325 // Java type definitions 326 327 // All kinds of 'plain' byte addresses 328 typedef signed char s_char; 329 typedef unsigned char u_char; 330 typedef u_char* address; 331 typedef uintptr_t address_word; // unsigned integer which will hold a pointer 332 // except for some implementations of a C++ 333 // linkage pointer to function. Should never 334 // need one of those to be placed in this 335 // type anyway. 336 337 // Utility functions to "portably" (?) bit twiddle pointers 338 // Where portable means keep ANSI C++ compilers quiet 339 340 inline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 341 inline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 342 343 // Utility functions to "portably" make cast to/from function pointers. 344 345 inline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 346 inline address_word castable_address(address x) { return address_word(x) ; } 347 inline address_word castable_address(void* x) { return address_word(x) ; } 348 349 // Pointer subtraction. 350 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 351 // the range we might need to find differences from one end of the heap 352 // to the other. 353 // A typical use might be: 354 // if (pointer_delta(end(), top()) >= size) { 355 // // enough room for an object of size 356 // ... 357 // and then additions like 358 // ... top() + size ... 359 // are safe because we know that top() is at least size below end(). 360 inline size_t pointer_delta(const volatile void* left, 361 const volatile void* right, 362 size_t element_size) { 363 return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 364 } 365 366 // A version specialized for HeapWord*'s. 367 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 368 return pointer_delta(left, right, sizeof(HeapWord)); 369 } 370 // A version specialized for MetaWord*'s. 371 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 372 return pointer_delta(left, right, sizeof(MetaWord)); 373 } 374 375 // 376 // ANSI C++ does not allow casting from one pointer type to a function pointer 377 // directly without at best a warning. This macro accomplishes it silently 378 // In every case that is present at this point the value be cast is a pointer 379 // to a C linkage function. In some case the type used for the cast reflects 380 // that linkage and a picky compiler would not complain. In other cases because 381 // there is no convenient place to place a typedef with extern C linkage (i.e 382 // a platform dependent header file) it doesn't. At this point no compiler seems 383 // picky enough to catch these instances (which are few). It is possible that 384 // using templates could fix these for all cases. This use of templates is likely 385 // so far from the middle of the road that it is likely to be problematic in 386 // many C++ compilers. 387 // 388 #define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 389 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 390 391 // Unsigned byte types for os and stream.hpp 392 393 // Unsigned one, two, four and eigth byte quantities used for describing 394 // the .class file format. See JVM book chapter 4. 395 396 typedef jubyte u1; 397 typedef jushort u2; 398 typedef juint u4; 399 typedef julong u8; 400 401 const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 402 const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 403 const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 404 const julong max_julong = (julong)-1; // 0xFF....FF largest julong 405 406 typedef jbyte s1; 407 typedef jshort s2; 408 typedef jint s4; 409 typedef jlong s8; 410 411 const jbyte min_jbyte = -(1 << 7); // smallest jbyte 412 const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 413 const jshort min_jshort = -(1 << 15); // smallest jshort 414 const jshort max_jshort = (1 << 15) - 1; // largest jshort 415 416 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 417 const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 418 419 //---------------------------------------------------------------------------------------------------- 420 // JVM spec restrictions 421 422 const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 423 424 //---------------------------------------------------------------------------------------------------- 425 // Default and minimum StringTable and SymbolTable size values 426 // Must be a power of 2 427 428 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 429 const size_t minimumStringTableSize = 128; 430 431 const size_t defaultSymbolTableSize = 32768; // 2^15 432 const size_t minimumSymbolTableSize = 1024; 433 434 435 //---------------------------------------------------------------------------------------------------- 436 // HotSwap - for JVMTI aka Class File Replacement and PopFrame 437 // 438 // Determines whether on-the-fly class replacement and frame popping are enabled. 439 440 #define HOTSWAP 441 442 //---------------------------------------------------------------------------------------------------- 443 // Object alignment, in units of HeapWords. 444 // 445 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 446 // reference fields can be naturally aligned. 447 448 extern int MinObjAlignment; 449 extern int MinObjAlignmentInBytes; 450 extern int MinObjAlignmentInBytesMask; 451 452 extern int LogMinObjAlignment; 453 extern int LogMinObjAlignmentInBytes; 454 455 const int LogKlassAlignmentInBytes = 3; 456 const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 457 const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 458 const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 459 460 // Maximal size of heap where unscaled compression can be used. Also upper bound 461 // for heap placement: 4GB. 462 const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 463 // Maximal size of heap where compressed oops can be used. Also upper bound for heap 464 // placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 465 extern uint64_t OopEncodingHeapMax; 466 467 // Maximal size of compressed class space. Above this limit compression is not possible. 468 // Also upper bound for placement of zero based class space. (Class space is further limited 469 // to be < 3G, see arguments.cpp.) 470 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 471 472 // Machine dependent stuff 473 474 // The maximum size of the code cache. Can be overridden by targets. 475 #define CODE_CACHE_SIZE_LIMIT (2*G) 476 // Allow targets to reduce the default size of the code cache. 477 #define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 478 479 #include CPU_HEADER(globalDefinitions) 480 481 // To assure the IRIW property on processors that are not multiple copy 482 // atomic, sync instructions must be issued between volatile reads to 483 // assure their ordering, instead of after volatile stores. 484 // (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 485 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 486 #ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC 487 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true; 488 #else 489 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 490 #endif 491 492 // The expected size in bytes of a cache line, used to pad data structures. 493 #ifndef DEFAULT_CACHE_LINE_SIZE 494 #define DEFAULT_CACHE_LINE_SIZE 64 495 #endif 496 497 498 //---------------------------------------------------------------------------------------------------- 499 // Utility macros for compilers 500 // used to silence compiler warnings 501 502 #define Unused_Variable(var) var 503 504 505 //---------------------------------------------------------------------------------------------------- 506 // Prototyping 507 // "Code Missing Here" macro, un-define when integrating back from prototyping stage and break 508 // compilation on purpose (i.e. "forget me not") 509 #define PROTOTYPE 510 #ifdef PROTOTYPE 511 #define CMH(m) 512 #endif 513 514 //---------------------------------------------------------------------------------------------------- 515 // Miscellaneous 516 517 // 6302670 Eliminate Hotspot __fabsf dependency 518 // All fabs() callers should call this function instead, which will implicitly 519 // convert the operand to double, avoiding a dependency on __fabsf which 520 // doesn't exist in early versions of Solaris 8. 521 inline double fabsd(double value) { 522 return fabs(value); 523 } 524 525 // Returns numerator/denominator as percentage value from 0 to 100. If denominator 526 // is zero, return 0.0. 527 template<typename T> 528 inline double percent_of(T numerator, T denominator) { 529 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 530 } 531 532 //---------------------------------------------------------------------------------------------------- 533 // Special casts 534 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern 535 typedef union { 536 jfloat f; 537 jint i; 538 } FloatIntConv; 539 540 typedef union { 541 jdouble d; 542 jlong l; 543 julong ul; 544 } DoubleLongConv; 545 546 inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 547 inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 548 549 inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 550 inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 551 inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 552 553 inline jint low (jlong value) { return jint(value); } 554 inline jint high(jlong value) { return jint(value >> 32); } 555 556 // the fancy casts are a hopefully portable way 557 // to do unsigned 32 to 64 bit type conversion 558 inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 559 *value |= (jlong)(julong)(juint)low; } 560 561 inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 562 *value |= (jlong)high << 32; } 563 564 inline jlong jlong_from(jint h, jint l) { 565 jlong result = 0; // initialization to avoid warning 566 set_high(&result, h); 567 set_low(&result, l); 568 return result; 569 } 570 571 union jlong_accessor { 572 jint words[2]; 573 jlong long_value; 574 }; 575 576 void basic_types_init(); // cannot define here; uses assert 577 578 579 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 580 enum BasicType { 581 T_BOOLEAN = 4, 582 T_CHAR = 5, 583 T_FLOAT = 6, 584 T_DOUBLE = 7, 585 T_BYTE = 8, 586 T_SHORT = 9, 587 T_INT = 10, 588 T_LONG = 11, 589 T_OBJECT = 12, 590 T_ARRAY = 13, 591 T_VALUETYPE = 14, 592 T_VOID = 15, 593 T_ADDRESS = 16, 594 T_NARROWOOP = 17, 595 T_METADATA = 18, 596 T_NARROWKLASS = 19, 597 T_VALUETYPEPTR= 20, // the compiler needs a way to identify buffered values 598 T_CONFLICT = 21, // for stack value type with conflicting contents 599 T_ILLEGAL = 99 600 }; 601 602 inline bool is_java_primitive(BasicType t) { 603 return T_BOOLEAN <= t && t <= T_LONG; 604 } 605 606 inline bool is_subword_type(BasicType t) { 607 // these guys are processed exactly like T_INT in calling sequences: 608 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 609 } 610 611 inline bool is_signed_subword_type(BasicType t) { 612 return (t == T_BYTE || t == T_SHORT); 613 } 614 615 inline bool is_reference_type(BasicType t) { 616 return (t == T_OBJECT || t == T_ARRAY); 617 } 618 619 // Convert a char from a classfile signature to a BasicType 620 inline BasicType char2type(char c) { 621 switch( c ) { 622 case 'B': return T_BYTE; 623 case 'C': return T_CHAR; 624 case 'D': return T_DOUBLE; 625 case 'F': return T_FLOAT; 626 case 'I': return T_INT; 627 case 'J': return T_LONG; 628 case 'S': return T_SHORT; 629 case 'Z': return T_BOOLEAN; 630 case 'V': return T_VOID; 631 case 'L': return T_OBJECT; 632 case '[': return T_ARRAY; 633 case 'Q': return T_VALUETYPE; 634 } 635 return T_ILLEGAL; 636 } 637 638 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 639 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 640 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 641 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 642 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 643 extern BasicType name2type(const char* name); 644 645 // Auxiliary math routines 646 // least common multiple 647 extern size_t lcm(size_t a, size_t b); 648 649 650 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 651 enum BasicTypeSize { 652 T_BOOLEAN_size = 1, 653 T_CHAR_size = 1, 654 T_FLOAT_size = 1, 655 T_DOUBLE_size = 2, 656 T_BYTE_size = 1, 657 T_SHORT_size = 1, 658 T_INT_size = 1, 659 T_LONG_size = 2, 660 T_OBJECT_size = 1, 661 T_ARRAY_size = 1, 662 T_NARROWOOP_size = 1, 663 T_NARROWKLASS_size = 1, 664 T_VOID_size = 0, 665 T_VALUETYPE_size = 1 666 }; 667 668 669 // maps a BasicType to its instance field storage type: 670 // all sub-word integral types are widened to T_INT 671 extern BasicType type2field[T_CONFLICT+1]; 672 extern BasicType type2wfield[T_CONFLICT+1]; 673 674 675 // size in bytes 676 enum ArrayElementSize { 677 T_BOOLEAN_aelem_bytes = 1, 678 T_CHAR_aelem_bytes = 2, 679 T_FLOAT_aelem_bytes = 4, 680 T_DOUBLE_aelem_bytes = 8, 681 T_BYTE_aelem_bytes = 1, 682 T_SHORT_aelem_bytes = 2, 683 T_INT_aelem_bytes = 4, 684 T_LONG_aelem_bytes = 8, 685 #ifdef _LP64 686 T_OBJECT_aelem_bytes = 8, 687 T_ARRAY_aelem_bytes = 8, 688 T_VALUETYPE_aelem_bytes = 8, 689 #else 690 T_OBJECT_aelem_bytes = 4, 691 T_ARRAY_aelem_bytes = 4, 692 T_VALUETYPE_aelem_bytes = 4, 693 #endif 694 T_NARROWOOP_aelem_bytes = 4, 695 T_NARROWKLASS_aelem_bytes = 4, 696 T_VOID_aelem_bytes = 0, 697 #ifdef _LP64 698 T_VALUETYPEPTR_aelem_bytes= 8 699 #else 700 T_VALUETYPEPTR_aelem_bytes= 4 701 #endif 702 }; 703 704 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 705 #ifdef ASSERT 706 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 707 #else 708 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 709 #endif 710 711 712 // JavaValue serves as a container for arbitrary Java values. 713 714 class JavaValue { 715 716 public: 717 typedef union JavaCallValue { 718 jfloat f; 719 jdouble d; 720 jint i; 721 jlong l; 722 jobject h; 723 jvaluetype q; 724 } JavaCallValue; 725 726 private: 727 BasicType _type; 728 JavaCallValue _value; 729 730 public: 731 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 732 733 JavaValue(jfloat value) { 734 _type = T_FLOAT; 735 _value.f = value; 736 } 737 738 JavaValue(jdouble value) { 739 _type = T_DOUBLE; 740 _value.d = value; 741 } 742 743 jfloat get_jfloat() const { return _value.f; } 744 jdouble get_jdouble() const { return _value.d; } 745 jint get_jint() const { return _value.i; } 746 jlong get_jlong() const { return _value.l; } 747 jobject get_jobject() const { return _value.h; } 748 JavaCallValue* get_value_addr() { return &_value; } 749 BasicType get_type() const { return _type; } 750 751 void set_jfloat(jfloat f) { _value.f = f;} 752 void set_jdouble(jdouble d) { _value.d = d;} 753 void set_jint(jint i) { _value.i = i;} 754 void set_jlong(jlong l) { _value.l = l;} 755 void set_jobject(jobject h) { _value.h = h;} 756 void set_type(BasicType t) { _type = t; } 757 758 jboolean get_jboolean() const { return (jboolean) (_value.i);} 759 jbyte get_jbyte() const { return (jbyte) (_value.i);} 760 jchar get_jchar() const { return (jchar) (_value.i);} 761 jshort get_jshort() const { return (jshort) (_value.i);} 762 763 }; 764 765 766 #define STACK_BIAS 0 767 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 768 // in order to extend the reach of the stack pointer. 769 #if defined(SPARC) && defined(_LP64) 770 #undef STACK_BIAS 771 #define STACK_BIAS 0x7ff 772 #endif 773 774 775 // TosState describes the top-of-stack state before and after the execution of 776 // a bytecode or method. The top-of-stack value may be cached in one or more CPU 777 // registers. The TosState corresponds to the 'machine representation' of this cached 778 // value. There's 4 states corresponding to the JAVA types int, long, float & double 779 // as well as a 5th state in case the top-of-stack value is actually on the top 780 // of stack (in memory) and thus not cached. The atos state corresponds to the itos 781 // state when it comes to machine representation but is used separately for (oop) 782 // type specific operations (e.g. verification code). 783 784 enum TosState { // describes the tos cache contents 785 btos = 0, // byte, bool tos cached 786 ztos = 1, // byte, bool tos cached 787 ctos = 2, // char tos cached 788 stos = 3, // short tos cached 789 itos = 4, // int tos cached 790 ltos = 5, // long tos cached 791 ftos = 6, // float tos cached 792 dtos = 7, // double tos cached 793 atos = 8, // object cached 794 vtos = 9, // tos not cached, 795 number_of_states, 796 ilgl // illegal state: should not occur 797 }; 798 799 800 inline TosState as_TosState(BasicType type) { 801 switch (type) { 802 case T_BYTE : return btos; 803 case T_BOOLEAN: return ztos; 804 case T_CHAR : return ctos; 805 case T_SHORT : return stos; 806 case T_INT : return itos; 807 case T_LONG : return ltos; 808 case T_FLOAT : return ftos; 809 case T_DOUBLE : return dtos; 810 case T_VOID : return vtos; 811 case T_VALUETYPE: // fall through 812 case T_ARRAY : // fall through 813 case T_OBJECT : return atos; 814 default : return ilgl; 815 } 816 } 817 818 inline BasicType as_BasicType(TosState state) { 819 switch (state) { 820 case btos : return T_BYTE; 821 case ztos : return T_BOOLEAN; 822 case ctos : return T_CHAR; 823 case stos : return T_SHORT; 824 case itos : return T_INT; 825 case ltos : return T_LONG; 826 case ftos : return T_FLOAT; 827 case dtos : return T_DOUBLE; 828 case atos : return T_OBJECT; 829 case vtos : return T_VOID; 830 default : return T_ILLEGAL; 831 } 832 } 833 834 835 // Helper function to convert BasicType info into TosState 836 // Note: Cannot define here as it uses global constant at the time being. 837 TosState as_TosState(BasicType type); 838 839 840 // JavaThreadState keeps track of which part of the code a thread is executing in. This 841 // information is needed by the safepoint code. 842 // 843 // There are 4 essential states: 844 // 845 // _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 846 // _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 847 // _thread_in_vm : Executing in the vm 848 // _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 849 // 850 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 851 // a transition from one state to another. These extra states makes it possible for the safepoint code to 852 // handle certain thread_states without having to suspend the thread - making the safepoint code faster. 853 // 854 // Given a state, the xxxx_trans state can always be found by adding 1. 855 // 856 enum JavaThreadState { 857 _thread_uninitialized = 0, // should never happen (missing initialization) 858 _thread_new = 2, // just starting up, i.e., in process of being initialized 859 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 860 _thread_in_native = 4, // running in native code 861 _thread_in_native_trans = 5, // corresponding transition state 862 _thread_in_vm = 6, // running in VM 863 _thread_in_vm_trans = 7, // corresponding transition state 864 _thread_in_Java = 8, // running in Java or in stub code 865 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 866 _thread_blocked = 10, // blocked in vm 867 _thread_blocked_trans = 11, // corresponding transition state 868 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 869 }; 870 871 872 873 //---------------------------------------------------------------------------------------------------- 874 // 'Forward' declarations of frequently used classes 875 // (in order to reduce interface dependencies & reduce 876 // number of unnecessary compilations after changes) 877 878 class ClassFileStream; 879 880 class Event; 881 882 class Thread; 883 class VMThread; 884 class JavaThread; 885 class Threads; 886 887 class VM_Operation; 888 class VMOperationQueue; 889 890 class CodeBlob; 891 class CompiledMethod; 892 class nmethod; 893 class RuntimeBlob; 894 class OSRAdapter; 895 class I2CAdapter; 896 class C2IAdapter; 897 class CompiledIC; 898 class relocInfo; 899 class ScopeDesc; 900 class PcDesc; 901 902 class Recompiler; 903 class Recompilee; 904 class RecompilationPolicy; 905 class RFrame; 906 class CompiledRFrame; 907 class InterpretedRFrame; 908 909 class vframe; 910 class javaVFrame; 911 class interpretedVFrame; 912 class compiledVFrame; 913 class deoptimizedVFrame; 914 class externalVFrame; 915 class entryVFrame; 916 917 class RegisterMap; 918 919 class Mutex; 920 class Monitor; 921 class BasicLock; 922 class BasicObjectLock; 923 924 class PeriodicTask; 925 926 class JavaCallWrapper; 927 928 class oopDesc; 929 class metaDataOopDesc; 930 931 class NativeCall; 932 933 class zone; 934 935 class StubQueue; 936 937 class outputStream; 938 939 class ResourceArea; 940 941 class DebugInformationRecorder; 942 class ScopeValue; 943 class CompressedStream; 944 class DebugInfoReadStream; 945 class DebugInfoWriteStream; 946 class LocationValue; 947 class ConstantValue; 948 class IllegalValue; 949 950 class PrivilegedElement; 951 class MonitorArray; 952 953 class MonitorInfo; 954 955 class OffsetClosure; 956 class OopMapCache; 957 class InterpreterOopMap; 958 class OopMapCacheEntry; 959 class OSThread; 960 961 typedef int (*OSThreadStartFunc)(void*); 962 963 class Space; 964 965 class JavaValue; 966 class methodHandle; 967 class JavaCallArguments; 968 969 //---------------------------------------------------------------------------------------------------- 970 // Special constants for debugging 971 972 const jint badInt = -3; // generic "bad int" value 973 const intptr_t badAddressVal = -2; // generic "bad address" value 974 const intptr_t badOopVal = -1; // generic "bad oop" value 975 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 976 const int badStackSegVal = 0xCA; // value used to zap stack segments 977 const int badHandleValue = 0xBC; // value used to zap vm handle area 978 const int badResourceValue = 0xAB; // value used to zap resource area 979 const int freeBlockPad = 0xBA; // value used to pad freed blocks. 980 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 981 const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 982 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 983 const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 984 const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 985 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 986 987 988 // (These must be implemented as #defines because C++ compilers are 989 // not obligated to inline non-integral constants!) 990 #define badAddress ((address)::badAddressVal) 991 #define badOop (cast_to_oop(::badOopVal)) 992 #define badHeapWord (::badHeapWordVal) 993 994 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 995 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 996 997 //---------------------------------------------------------------------------------------------------- 998 // Utility functions for bitfield manipulations 999 1000 const intptr_t AllBits = ~0; // all bits set in a word 1001 const intptr_t NoBits = 0; // no bits set in a word 1002 const jlong NoLongBits = 0; // no bits set in a long 1003 const intptr_t OneBit = 1; // only right_most bit set in a word 1004 1005 // get a word with the n.th or the right-most or left-most n bits set 1006 // (note: #define used only so that they can be used in enum constant definitions) 1007 #define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 1008 #define right_n_bits(n) (nth_bit(n) - 1) 1009 #define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 1010 1011 // bit-operations using a mask m 1012 inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 1013 inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 1014 inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 1015 inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 1016 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 1017 1018 // bit-operations using the n.th bit 1019 inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 1020 inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 1021 inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 1022 1023 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 1024 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 1025 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 1026 } 1027 1028 1029 //---------------------------------------------------------------------------------------------------- 1030 // Utility functions for integers 1031 1032 // Avoid use of global min/max macros which may cause unwanted double 1033 // evaluation of arguments. 1034 #ifdef max 1035 #undef max 1036 #endif 1037 1038 #ifdef min 1039 #undef min 1040 #endif 1041 1042 // It is necessary to use templates here. Having normal overloaded 1043 // functions does not work because it is necessary to provide both 32- 1044 // and 64-bit overloaded functions, which does not work, and having 1045 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 1046 // will be even more error-prone than macros. 1047 template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 1048 template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 1049 template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 1050 template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 1051 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 1052 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 1053 1054 template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 1055 1056 // true if x is a power of 2, false otherwise 1057 inline bool is_power_of_2(intptr_t x) { 1058 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits)); 1059 } 1060 1061 // long version of is_power_of_2 1062 inline bool is_power_of_2_long(jlong x) { 1063 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits)); 1064 } 1065 1066 // Returns largest i such that 2^i <= x. 1067 // If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 1068 // If x == 0, the function returns -1. 1069 inline int log2_intptr(intptr_t x) { 1070 int i = -1; 1071 uintptr_t p = 1; 1072 while (p != 0 && p <= (uintptr_t)x) { 1073 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1074 i++; p *= 2; 1075 } 1076 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1077 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 1078 return i; 1079 } 1080 1081 //* largest i such that 2^i <= x 1082 // A negative value of 'x' will return '63' 1083 inline int log2_long(jlong x) { 1084 int i = -1; 1085 julong p = 1; 1086 while (p != 0 && p <= (julong)x) { 1087 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1088 i++; p *= 2; 1089 } 1090 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1091 // (if p = 0 then overflow occurred and i = 63) 1092 return i; 1093 } 1094 1095 //* the argument must be exactly a power of 2 1096 inline int exact_log2(intptr_t x) { 1097 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x); 1098 return log2_intptr(x); 1099 } 1100 1101 // the argument doesn't need to be a power of two 1102 inline int upper_log2(intptr_t x) { 1103 int shift = log2_intptr(x); 1104 intptr_t y = 1ULL << shift; 1105 if (y < x) { 1106 shift++; 1107 } 1108 return shift; 1109 } 1110 1111 //* the argument must be exactly a power of 2 1112 inline int exact_log2_long(jlong x) { 1113 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x); 1114 return log2_long(x); 1115 } 1116 1117 inline bool is_odd (intx x) { return x & 1; } 1118 inline bool is_even(intx x) { return !is_odd(x); } 1119 1120 // "to" should be greater than "from." 1121 inline intx byte_size(void* from, void* to) { 1122 return (address)to - (address)from; 1123 } 1124 1125 //---------------------------------------------------------------------------------------------------- 1126 // Avoid non-portable casts with these routines (DEPRECATED) 1127 1128 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE 1129 // Bytes is optimized machine-specifically and may be much faster then the portable routines below. 1130 1131 // Given sequence of four bytes, build into a 32-bit word 1132 // following the conventions used in class files. 1133 // On the 386, this could be realized with a simple address cast. 1134 // 1135 1136 // This routine takes eight bytes: 1137 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1138 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 )) 1139 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 )) 1140 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 )) 1141 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 )) 1142 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 )) 1143 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 )) 1144 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 )) 1145 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 )); 1146 } 1147 1148 // This routine takes four bytes: 1149 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1150 return (( u4(c1) << 24 ) & 0xff000000) 1151 | (( u4(c2) << 16 ) & 0x00ff0000) 1152 | (( u4(c3) << 8 ) & 0x0000ff00) 1153 | (( u4(c4) << 0 ) & 0x000000ff); 1154 } 1155 1156 // And this one works if the four bytes are contiguous in memory: 1157 inline u4 build_u4_from( u1* p ) { 1158 return build_u4_from( p[0], p[1], p[2], p[3] ); 1159 } 1160 1161 // Ditto for two-byte ints: 1162 inline u2 build_u2_from( u1 c1, u1 c2 ) { 1163 return u2((( u2(c1) << 8 ) & 0xff00) 1164 | (( u2(c2) << 0 ) & 0x00ff)); 1165 } 1166 1167 // And this one works if the two bytes are contiguous in memory: 1168 inline u2 build_u2_from( u1* p ) { 1169 return build_u2_from( p[0], p[1] ); 1170 } 1171 1172 // Ditto for floats: 1173 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1174 u4 u = build_u4_from( c1, c2, c3, c4 ); 1175 return *(jfloat*)&u; 1176 } 1177 1178 inline jfloat build_float_from( u1* p ) { 1179 u4 u = build_u4_from( p ); 1180 return *(jfloat*)&u; 1181 } 1182 1183 1184 // now (64-bit) longs 1185 1186 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1187 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 )) 1188 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 )) 1189 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 )) 1190 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 )) 1191 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 )) 1192 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 )) 1193 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 )) 1194 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 )); 1195 } 1196 1197 inline jlong build_long_from( u1* p ) { 1198 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] ); 1199 } 1200 1201 1202 // Doubles, too! 1203 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1204 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 ); 1205 return *(jdouble*)&u; 1206 } 1207 1208 inline jdouble build_double_from( u1* p ) { 1209 jlong u = build_long_from( p ); 1210 return *(jdouble*)&u; 1211 } 1212 1213 1214 // Portable routines to go the other way: 1215 1216 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) { 1217 c1 = u1(x >> 8); 1218 c2 = u1(x); 1219 } 1220 1221 inline void explode_short_to( u2 x, u1* p ) { 1222 explode_short_to( x, p[0], p[1]); 1223 } 1224 1225 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) { 1226 c1 = u1(x >> 24); 1227 c2 = u1(x >> 16); 1228 c3 = u1(x >> 8); 1229 c4 = u1(x); 1230 } 1231 1232 inline void explode_int_to( u4 x, u1* p ) { 1233 explode_int_to( x, p[0], p[1], p[2], p[3]); 1234 } 1235 1236 1237 // Pack and extract shorts to/from ints: 1238 1239 inline int extract_low_short_from_int(jint x) { 1240 return x & 0xffff; 1241 } 1242 1243 inline int extract_high_short_from_int(jint x) { 1244 return (x >> 16) & 0xffff; 1245 } 1246 1247 inline int build_int_from_shorts( jushort low, jushort high ) { 1248 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1249 } 1250 1251 // Convert pointer to intptr_t, for use in printing pointers. 1252 inline intptr_t p2i(const void * p) { 1253 return (intptr_t) p; 1254 } 1255 1256 // swap a & b 1257 template<class T> static void swap(T& a, T& b) { 1258 T tmp = a; 1259 a = b; 1260 b = tmp; 1261 } 1262 1263 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1264 1265 //---------------------------------------------------------------------------------------------------- 1266 // Sum and product which can never overflow: they wrap, just like the 1267 // Java operations. Note that we don't intend these to be used for 1268 // general-purpose arithmetic: their purpose is to emulate Java 1269 // operations. 1270 1271 // The goal of this code to avoid undefined or implementation-defined 1272 // behavior. The use of an lvalue to reference cast is explicitly 1273 // permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1274 // 15 in C++03] 1275 #define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1276 inline TYPE NAME (TYPE in1, TYPE in2) { \ 1277 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1278 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1279 return reinterpret_cast<TYPE&>(ures); \ 1280 } 1281 1282 JAVA_INTEGER_OP(+, java_add, jint, juint) 1283 JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1284 JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1285 JAVA_INTEGER_OP(+, java_add, jlong, julong) 1286 JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1287 JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1288 1289 #undef JAVA_INTEGER_OP 1290 1291 // Dereference vptr 1292 // All C++ compilers that we know of have the vtbl pointer in the first 1293 // word. If there are exceptions, this function needs to be made compiler 1294 // specific. 1295 static inline void* dereference_vptr(const void* addr) { 1296 return *(void**)addr; 1297 } 1298 1299 //---------------------------------------------------------------------------------------------------- 1300 // String type aliases used by command line flag declarations and 1301 // processing utilities. 1302 1303 typedef const char* ccstr; 1304 typedef const char* ccstrlist; // represents string arguments which accumulate 1305 1306 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP