globalDefinitions.hpp revision 13242:fcb4803050e8
1228753Smm/* 2228753Smm * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3228753Smm * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4228753Smm * 5228753Smm * This code is free software; you can redistribute it and/or modify it 6228753Smm * under the terms of the GNU General Public License version 2 only, as 7228753Smm * published by the Free Software Foundation. 8228753Smm * 9228753Smm * This code is distributed in the hope that it will be useful, but WITHOUT 10228753Smm * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11228753Smm * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12228753Smm * version 2 for more details (a copy is included in the LICENSE file that 13228753Smm * accompanied this code). 14228753Smm * 15228753Smm * You should have received a copy of the GNU General Public License version 16228753Smm * 2 along with this work; if not, write to the Free Software Foundation, 17228753Smm * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18228753Smm * 19228753Smm * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20228753Smm * or visit www.oracle.com if you need additional information or have any 21228753Smm * questions. 22228753Smm * 23228753Smm */ 24228753Smm 25228753Smm#ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 26228753Smm#define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 27228753Smm 28228753Smm#include "utilities/compilerWarnings.hpp" 29228763Smm#include "utilities/debug.hpp" 30228753Smm#include "utilities/macros.hpp" 31228753Smm 32228753Smm#include COMPILER_HEADER(utilities/globalDefinitions) 33228753Smm 34228753Smm// Defaults for macros that might be defined per compiler. 35228753Smm#ifndef NOINLINE 36228753Smm#define NOINLINE 37228753Smm#endif 38228753Smm#ifndef ALWAYSINLINE 39228753Smm#define ALWAYSINLINE inline 40228753Smm#endif 41228753Smm 42228753Smm// This file holds all globally used constants & types, class (forward) 43228753Smm// declarations and a few frequently used utility functions. 44228753Smm 45228753Smm//---------------------------------------------------------------------------------------------------- 46228753Smm// Printf-style formatters for fixed- and variable-width types as pointers and 47228753Smm// integers. These are derived from the definitions in inttypes.h. If the platform 48228753Smm// doesn't provide appropriate definitions, they should be provided in 49228753Smm// the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp) 50228753Smm 51228753Smm#define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false") 52228753Smm 53228753Smm// Format 32-bit quantities. 54232153Smm#define INT32_FORMAT "%" PRId32 55228753Smm#define UINT32_FORMAT "%" PRIu32 56228753Smm#define INT32_FORMAT_W(width) "%" #width PRId32 57228753Smm#define UINT32_FORMAT_W(width) "%" #width PRIu32 58228753Smm 59228753Smm#define PTR32_FORMAT "0x%08" PRIx32 60228753Smm#define PTR32_FORMAT_W(width) "0x%" #width PRIx32 61228753Smm 62228753Smm// Format 64-bit quantities. 63228753Smm#define INT64_FORMAT "%" PRId64 64248616Smm#define UINT64_FORMAT "%" PRIu64 65228753Smm#define UINT64_FORMAT_X "%" PRIx64 66232153Smm#define INT64_FORMAT_W(width) "%" #width PRId64 67228753Smm#define UINT64_FORMAT_W(width) "%" #width PRIu64 68228753Smm 69228753Smm#define PTR64_FORMAT "0x%016" PRIx64 70248616Smm 71228753Smm// Format jlong, if necessary 72228753Smm#ifndef JLONG_FORMAT 73228753Smm#define JLONG_FORMAT INT64_FORMAT 74228753Smm#endif 75248616Smm#ifndef JULONG_FORMAT 76228753Smm#define JULONG_FORMAT UINT64_FORMAT 77248616Smm#endif 78228753Smm#ifndef JULONG_FORMAT_X 79228753Smm#define JULONG_FORMAT_X UINT64_FORMAT_X 80228753Smm#endif 81228753Smm 82228753Smm// Format pointers which change size between 32- and 64-bit. 83228753Smm#ifdef _LP64 84228753Smm#define INTPTR_FORMAT "0x%016" PRIxPTR 85228753Smm#define PTR_FORMAT "0x%016" PRIxPTR 86228753Smm#else // !_LP64 87228753Smm#define INTPTR_FORMAT "0x%08" PRIxPTR 88248616Smm#define PTR_FORMAT "0x%08" PRIxPTR 89228753Smm#endif // _LP64 90228753Smm 91228753Smm#define INTPTR_FORMAT_W(width) "%" #width PRIxPTR 92228753Smm 93228753Smm#define SSIZE_FORMAT "%" PRIdPTR 94228753Smm#define SIZE_FORMAT "%" PRIuPTR 95228753Smm#define SIZE_FORMAT_HEX "0x%" PRIxPTR 96228753Smm#define SSIZE_FORMAT_W(width) "%" #width PRIdPTR 97228753Smm#define SIZE_FORMAT_W(width) "%" #width PRIuPTR 98228753Smm#define SIZE_FORMAT_HEX_W(width) "0x%" #width PRIxPTR 99228753Smm 100228753Smm#define INTX_FORMAT "%" PRIdPTR 101228753Smm#define UINTX_FORMAT "%" PRIuPTR 102228753Smm#define INTX_FORMAT_W(width) "%" #width PRIdPTR 103228753Smm#define UINTX_FORMAT_W(width) "%" #width PRIuPTR 104228753Smm 105228753Smm//---------------------------------------------------------------------------------------------------- 106228753Smm// Constants 107228753Smm 108228753Smmconst int LogBytesPerShort = 1; 109228753Smmconst int LogBytesPerInt = 2; 110228753Smm#ifdef _LP64 111228753Smmconst int LogBytesPerWord = 3; 112228753Smm#else 113228753Smmconst int LogBytesPerWord = 2; 114228753Smm#endif 115228753Smmconst int LogBytesPerLong = 3; 116228753Smm 117228753Smmconst int BytesPerShort = 1 << LogBytesPerShort; 118232153Smmconst int BytesPerInt = 1 << LogBytesPerInt; 119228753Smmconst int BytesPerWord = 1 << LogBytesPerWord; 120228753Smmconst int BytesPerLong = 1 << LogBytesPerLong; 121228753Smm 122228753Smmconst int LogBitsPerByte = 3; 123228753Smmconst int LogBitsPerShort = LogBitsPerByte + LogBytesPerShort; 124228753Smmconst int LogBitsPerInt = LogBitsPerByte + LogBytesPerInt; 125228753Smmconst int LogBitsPerWord = LogBitsPerByte + LogBytesPerWord; 126228753Smmconst int LogBitsPerLong = LogBitsPerByte + LogBytesPerLong; 127228753Smm 128228753Smmconst int BitsPerByte = 1 << LogBitsPerByte; 129228753Smmconst int BitsPerShort = 1 << LogBitsPerShort; 130228753Smmconst int BitsPerInt = 1 << LogBitsPerInt; 131228753Smmconst int BitsPerWord = 1 << LogBitsPerWord; 132228753Smmconst int BitsPerLong = 1 << LogBitsPerLong; 133228753Smm 134228753Smmconst int WordAlignmentMask = (1 << LogBytesPerWord) - 1; 135228753Smmconst int LongAlignmentMask = (1 << LogBytesPerLong) - 1; 136228753Smm 137228753Smmconst int WordsPerLong = 2; // Number of stack entries for longs 138228753Smm 139228753Smmconst int oopSize = sizeof(char*); // Full-width oop 140228753Smmextern int heapOopSize; // Oop within a java object 141228753Smmconst int wordSize = sizeof(char*); 142228753Smmconst int longSize = sizeof(jlong); 143228753Smmconst int jintSize = sizeof(jint); 144228753Smmconst int size_tSize = sizeof(size_t); 145228753Smm 146228753Smmconst int BytesPerOop = BytesPerWord; // Full-width oop 147228753Smm 148228753Smmextern int LogBytesPerHeapOop; // Oop within a java object 149228753Smmextern int LogBitsPerHeapOop; 150228753Smmextern int BytesPerHeapOop; 151228753Smmextern int BitsPerHeapOop; 152228753Smm 153228753Smmconst int BitsPerJavaInteger = 32; 154228753Smmconst int BitsPerJavaLong = 64; 155228753Smmconst int BitsPerSize_t = size_tSize * BitsPerByte; 156228753Smm 157228753Smm// Size of a char[] needed to represent a jint as a string in decimal. 158228753Smmconst int jintAsStringSize = 12; 159228753Smm 160228753Smm// In fact this should be 161228753Smm// log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); 162228753Smm// see os::set_memory_serialize_page() 163228753Smm#ifdef _LP64 164228753Smmconst int SerializePageShiftCount = 4; 165228753Smm#else 166228753Smmconst int SerializePageShiftCount = 3; 167228753Smm#endif 168228753Smm 169228753Smm// An opaque struct of heap-word width, so that HeapWord* can be a generic 170228753Smm// pointer into the heap. We require that object sizes be measured in 171228753Smm// units of heap words, so that that 172228753Smm// HeapWord* hw; 173228753Smm// hw += oop(hw)->foo(); 174228753Smm// works, where foo is a method (like size or scavenge) that returns the 175228753Smm// object size. 176228753Smmclass HeapWord { 177228753Smm friend class VMStructs; 178228753Smm private: 179228753Smm char* i; 180228753Smm#ifndef PRODUCT 181228753Smm public: 182228753Smm char* value() { return i; } 183228753Smm#endif 184228753Smm}; 185228753Smm 186228753Smm// Analogous opaque struct for metadata allocated from 187228753Smm// metaspaces. 188228753Smmclass MetaWord { 189228753Smm private: 190228753Smm char* i; 191228753Smm}; 192228753Smm 193228753Smm// HeapWordSize must be 2^LogHeapWordSize. 194228753Smmconst int HeapWordSize = sizeof(HeapWord); 195228753Smm#ifdef _LP64 196228753Smmconst int LogHeapWordSize = 3; 197232153Smm#else 198228753Smmconst int LogHeapWordSize = 2; 199228753Smm#endif 200228753Smmconst int HeapWordsPerLong = BytesPerLong / HeapWordSize; 201228753Smmconst int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize; 202228753Smm 203228753Smm// The larger HeapWordSize for 64bit requires larger heaps 204228753Smm// for the same application running in 64bit. See bug 4967770. 205228753Smm// The minimum alignment to a heap word size is done. Other 206228753Smm// parts of the memory system may require additional alignment 207228753Smm// and are responsible for those alignments. 208228753Smm#ifdef _LP64 209228753Smm#define ScaleForWordSize(x) align_size_down_((x) * 13 / 10, HeapWordSize) 210228753Smm#else 211232153Smm#define ScaleForWordSize(x) (x) 212228753Smm#endif 213228753Smm 214228753Smm// The minimum number of native machine words necessary to contain "byte_size" 215228753Smm// bytes. 216228753Smminline size_t heap_word_size(size_t byte_size) { 217228753Smm return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize; 218228753Smm} 219228753Smm 220228753Smm//------------------------------------------- 221228753Smm// Constant for jlong (standardized by C++11) 222228753Smm 223228753Smm// Build a 64bit integer constant 224228753Smm#define CONST64(x) (x ## LL) 225228753Smm#define UCONST64(x) (x ## ULL) 226228753Smm 227228753Smmconst jlong min_jlong = CONST64(0x8000000000000000); 228228753Smmconst jlong max_jlong = CONST64(0x7fffffffffffffff); 229228753Smm 230228753Smmconst size_t K = 1024; 231228753Smmconst size_t M = K*K; 232228753Smmconst size_t G = M*K; 233228753Smmconst size_t HWperKB = K / sizeof(HeapWord); 234228753Smm 235228753Smm// Constants for converting from a base unit to milli-base units. For 236228753Smm// example from seconds to milliseconds and microseconds 237228753Smm 238228753Smmconst int MILLIUNITS = 1000; // milli units per base unit 239228753Smmconst int MICROUNITS = 1000000; // micro units per base unit 240228753Smmconst int NANOUNITS = 1000000000; // nano units per base unit 241228753Smm 242228753Smmconst jlong NANOSECS_PER_SEC = CONST64(1000000000); 243228753Smmconst jint NANOSECS_PER_MILLISEC = 1000000; 244228753Smm 245228753Smminline const char* proper_unit_for_byte_size(size_t s) { 246228753Smm#ifdef _LP64 247228753Smm if (s >= 10*G) { 248228753Smm return "G"; 249228753Smm } 250232153Smm#endif 251232153Smm if (s >= 10*M) { 252232153Smm return "M"; 253228753Smm } else if (s >= 10*K) { 254228753Smm return "K"; 255228753Smm } else { 256228753Smm return "B"; 257228753Smm } 258228753Smm} 259228753Smm 260228753Smmtemplate <class T> 261228753Smminline T byte_size_in_proper_unit(T s) { 262228753Smm#ifdef _LP64 263232153Smm if (s >= 10*G) { 264228753Smm return (T)(s/G); 265228753Smm } 266228753Smm#endif 267228753Smm if (s >= 10*M) { 268228753Smm return (T)(s/M); 269228753Smm } else if (s >= 10*K) { 270228753Smm return (T)(s/K); 271228753Smm } else { 272228753Smm return s; 273228753Smm } 274228753Smm} 275228753Smm 276228753Smminline const char* exact_unit_for_byte_size(size_t s) { 277228753Smm#ifdef _LP64 278228753Smm if (s >= G && (s % G) == 0) { 279228753Smm return "G"; 280228753Smm } 281228753Smm#endif 282228753Smm if (s >= M && (s % M) == 0) { 283228753Smm return "M"; 284228753Smm } 285228753Smm if (s >= K && (s % K) == 0) { 286228753Smm return "K"; 287228753Smm } 288228753Smm return "B"; 289228753Smm} 290228753Smm 291228753Smminline size_t byte_size_in_exact_unit(size_t s) { 292228753Smm#ifdef _LP64 293228753Smm if (s >= G && (s % G) == 0) { 294228777Smm return s / G; 295228777Smm } 296228753Smm#endif 297228753Smm if (s >= M && (s % M) == 0) { 298228753Smm return s / M; 299228753Smm } 300228753Smm if (s >= K && (s % K) == 0) { 301228753Smm return s / K; 302228753Smm } 303228753Smm return s; 304228753Smm} 305228753Smm 306228753Smm//---------------------------------------------------------------------------------------------------- 307228753Smm// VM type definitions 308228753Smm 309228753Smm// intx and uintx are the 'extended' int and 'extended' unsigned int types; 310228753Smm// they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform. 311228753Smm 312228753Smmtypedef intptr_t intx; 313228753Smmtypedef uintptr_t uintx; 314228753Smm 315228753Smmconst intx min_intx = (intx)1 << (sizeof(intx)*BitsPerByte-1); 316228753Smmconst intx max_intx = (uintx)min_intx - 1; 317228753Smmconst uintx max_uintx = (uintx)-1; 318228753Smm 319228753Smm// Table of values: 320228753Smm// sizeof intx 4 8 321228753Smm// min_intx 0x80000000 0x8000000000000000 322228753Smm// max_intx 0x7FFFFFFF 0x7FFFFFFFFFFFFFFF 323228753Smm// max_uintx 0xFFFFFFFF 0xFFFFFFFFFFFFFFFF 324228753Smm 325228753Smmtypedef unsigned int uint; NEEDS_CLEANUP 326228753Smm 327228753Smm 328228753Smm//---------------------------------------------------------------------------------------------------- 329228753Smm// Java type definitions 330228753Smm 331228753Smm// All kinds of 'plain' byte addresses 332228753Smmtypedef signed char s_char; 333228753Smmtypedef unsigned char u_char; 334228753Smmtypedef u_char* address; 335228753Smmtypedef uintptr_t address_word; // unsigned integer which will hold a pointer 336228753Smm // except for some implementations of a C++ 337228753Smm // linkage pointer to function. Should never 338228753Smm // need one of those to be placed in this 339228753Smm // type anyway. 340228753Smm 341228753Smm// Utility functions to "portably" (?) bit twiddle pointers 342228753Smm// Where portable means keep ANSI C++ compilers quiet 343228753Smm 344228753Smminline address set_address_bits(address x, int m) { return address(intptr_t(x) | m); } 345228753Smminline address clear_address_bits(address x, int m) { return address(intptr_t(x) & ~m); } 346228753Smm 347228753Smm// Utility functions to "portably" make cast to/from function pointers. 348228753Smm 349232153Smminline address_word mask_address_bits(address x, int m) { return address_word(x) & m; } 350228753Smminline address_word castable_address(address x) { return address_word(x) ; } 351228753Smminline address_word castable_address(void* x) { return address_word(x) ; } 352228753Smm 353228753Smm// Pointer subtraction. 354238856Smm// The idea here is to avoid ptrdiff_t, which is signed and so doesn't have 355228753Smm// the range we might need to find differences from one end of the heap 356228753Smm// to the other. 357228753Smm// A typical use might be: 358228753Smm// if (pointer_delta(end(), top()) >= size) { 359228753Smm// // enough room for an object of size 360228753Smm// ... 361228753Smm// and then additions like 362228753Smm// ... top() + size ... 363228753Smm// are safe because we know that top() is at least size below end(). 364228753Smminline size_t pointer_delta(const volatile void* left, 365228753Smm const volatile void* right, 366228753Smm size_t element_size) { 367228753Smm return (((uintptr_t) left) - ((uintptr_t) right)) / element_size; 368232153Smm} 369228753Smm 370228753Smm// A version specialized for HeapWord*'s. 371228753Smminline size_t pointer_delta(const HeapWord* left, const HeapWord* right) { 372228753Smm return pointer_delta(left, right, sizeof(HeapWord)); 373228753Smm} 374228753Smm// A version specialized for MetaWord*'s. 375228753Smminline size_t pointer_delta(const MetaWord* left, const MetaWord* right) { 376228753Smm return pointer_delta(left, right, sizeof(MetaWord)); 377228753Smm} 378228753Smm 379// 380// ANSI C++ does not allow casting from one pointer type to a function pointer 381// directly without at best a warning. This macro accomplishes it silently 382// In every case that is present at this point the value be cast is a pointer 383// to a C linkage function. In some case the type used for the cast reflects 384// that linkage and a picky compiler would not complain. In other cases because 385// there is no convenient place to place a typedef with extern C linkage (i.e 386// a platform dependent header file) it doesn't. At this point no compiler seems 387// picky enough to catch these instances (which are few). It is possible that 388// using templates could fix these for all cases. This use of templates is likely 389// so far from the middle of the road that it is likely to be problematic in 390// many C++ compilers. 391// 392#define CAST_TO_FN_PTR(func_type, value) (reinterpret_cast<func_type>(value)) 393#define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr))) 394 395// Unsigned byte types for os and stream.hpp 396 397// Unsigned one, two, four and eigth byte quantities used for describing 398// the .class file format. See JVM book chapter 4. 399 400typedef jubyte u1; 401typedef jushort u2; 402typedef juint u4; 403typedef julong u8; 404 405const jubyte max_jubyte = (jubyte)-1; // 0xFF largest jubyte 406const jushort max_jushort = (jushort)-1; // 0xFFFF largest jushort 407const juint max_juint = (juint)-1; // 0xFFFFFFFF largest juint 408const julong max_julong = (julong)-1; // 0xFF....FF largest julong 409 410typedef jbyte s1; 411typedef jshort s2; 412typedef jint s4; 413typedef jlong s8; 414 415const jbyte min_jbyte = -(1 << 7); // smallest jbyte 416const jbyte max_jbyte = (1 << 7) - 1; // largest jbyte 417const jshort min_jshort = -(1 << 15); // smallest jshort 418const jshort max_jshort = (1 << 15) - 1; // largest jshort 419 420const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint 421const jint max_jint = (juint)min_jint - 1; // 0x7FFFFFFF == largest jint 422 423//---------------------------------------------------------------------------------------------------- 424// JVM spec restrictions 425 426const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (p.134) 427 428// Default ProtectionDomainCacheSize values 429 430const int defaultProtectionDomainCacheSize = NOT_LP64(137) LP64_ONLY(2017); 431 432//---------------------------------------------------------------------------------------------------- 433// Default and minimum StringTableSize values 434 435const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013); 436const int minimumStringTableSize = 1009; 437 438const int defaultSymbolTableSize = 20011; 439const int minimumSymbolTableSize = 1009; 440 441 442//---------------------------------------------------------------------------------------------------- 443// HotSwap - for JVMTI aka Class File Replacement and PopFrame 444// 445// Determines whether on-the-fly class replacement and frame popping are enabled. 446 447#define HOTSWAP 448 449//---------------------------------------------------------------------------------------------------- 450// Object alignment, in units of HeapWords. 451// 452// Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and 453// reference fields can be naturally aligned. 454 455extern int MinObjAlignment; 456extern int MinObjAlignmentInBytes; 457extern int MinObjAlignmentInBytesMask; 458 459extern int LogMinObjAlignment; 460extern int LogMinObjAlignmentInBytes; 461 462const int LogKlassAlignmentInBytes = 3; 463const int LogKlassAlignment = LogKlassAlignmentInBytes - LogHeapWordSize; 464const int KlassAlignmentInBytes = 1 << LogKlassAlignmentInBytes; 465const int KlassAlignment = KlassAlignmentInBytes / HeapWordSize; 466 467// Maximal size of heap where unscaled compression can be used. Also upper bound 468// for heap placement: 4GB. 469const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1); 470// Maximal size of heap where compressed oops can be used. Also upper bound for heap 471// placement for zero based compression algorithm: UnscaledOopHeapMax << LogMinObjAlignmentInBytes. 472extern uint64_t OopEncodingHeapMax; 473 474// Maximal size of compressed class space. Above this limit compression is not possible. 475// Also upper bound for placement of zero based class space. (Class space is further limited 476// to be < 3G, see arguments.cpp.) 477const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes; 478 479// Machine dependent stuff 480 481// The maximum size of the code cache. Can be overridden by targets. 482#define CODE_CACHE_SIZE_LIMIT (2*G) 483// Allow targets to reduce the default size of the code cache. 484#define CODE_CACHE_DEFAULT_LIMIT CODE_CACHE_SIZE_LIMIT 485 486#include CPU_HEADER(globalDefinitions) 487 488// To assure the IRIW property on processors that are not multiple copy 489// atomic, sync instructions must be issued between volatile reads to 490// assure their ordering, instead of after volatile stores. 491// (See "A Tutorial Introduction to the ARM and POWER Relaxed Memory Models" 492// by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge) 493#ifdef CPU_NOT_MULTIPLE_COPY_ATOMIC 494const bool support_IRIW_for_not_multiple_copy_atomic_cpu = true; 495#else 496const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false; 497#endif 498 499// The byte alignment to be used by Arena::Amalloc. See bugid 4169348. 500// Note: this value must be a power of 2 501 502#define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord) 503 504// Signed variants of alignment helpers. There are two versions of each, a macro 505// for use in places like enum definitions that require compile-time constant 506// expressions and a function for all other places so as to get type checking. 507 508// Using '(what) & ~align_mask(alignment)' to align 'what' down is broken when 509// 'alignment' is an unsigned int and 'what' is a wider type. The & operation 510// will widen the inverted mask, and not sign extend it, leading to a mask with 511// zeros in the most significant bits. The use of align_mask_widened() solves 512// this problem. 513#define align_mask(alignment) ((alignment) - 1) 514#define widen_to_type_of(what, type_carrier) (true ? (what) : (type_carrier)) 515#define align_mask_widened(alignment, type_carrier) widen_to_type_of(align_mask(alignment), (type_carrier)) 516 517#define align_size_down_(size, alignment) ((size) & ~align_mask_widened((alignment), (size))) 518 519#define align_size_up_(size, alignment) (align_size_down_((size) + align_mask(alignment), (alignment))) 520 521#define is_size_aligned_(size, alignment) ((size) == (align_size_up_(size, alignment))) 522 523// Helpers to align sizes and check for alignment 524 525template <typename T, typename A> 526inline T align_size_up(T size, A alignment) { 527 return align_size_up_(size, alignment); 528} 529 530template <typename T, typename A> 531inline T align_size_down(T size, A alignment) { 532 return align_size_down_(size, alignment); 533} 534 535template <typename T, typename A> 536inline bool is_size_aligned(T size, A alignment) { 537 return is_size_aligned_(size, alignment); 538} 539 540// Align down with a lower bound. If the aligning results in 0, return 'alignment'. 541template <typename T, typename A> 542inline T align_size_down_bounded(T size, A alignment) { 543 A aligned_size = align_size_down(size, alignment); 544 return aligned_size > 0 ? aligned_size : alignment; 545} 546 547// Helpers to align pointers and check for alignment. 548 549template <typename T, typename A> 550inline T* align_ptr_up(T* ptr, A alignment) { 551 return (T*)align_size_up((uintptr_t)ptr, alignment); 552} 553 554template <typename T, typename A> 555inline T* align_ptr_down(T* ptr, A alignment) { 556 return (T*)align_size_down((uintptr_t)ptr, alignment); 557} 558 559template <typename T, typename A> 560inline bool is_ptr_aligned(T* ptr, A alignment) { 561 return is_size_aligned((uintptr_t)ptr, alignment); 562} 563 564// Align metaspace objects by rounding up to natural word boundary 565template <typename T> 566inline T align_metadata_size(T size) { 567 return align_size_up(size, 1); 568} 569 570// Align objects in the Java Heap by rounding up their size, in HeapWord units. 571template <typename T> 572inline T align_object_size(T word_size) { 573 return align_size_up(word_size, MinObjAlignment); 574} 575 576inline bool is_object_aligned(size_t word_size) { 577 return is_size_aligned(word_size, MinObjAlignment); 578} 579 580inline bool is_ptr_object_aligned(const void* addr) { 581 return is_ptr_aligned(addr, MinObjAlignmentInBytes); 582} 583 584// Pad out certain offsets to jlong alignment, in HeapWord units. 585template <typename T> 586inline T align_object_offset(T offset) { 587 return align_size_up(offset, HeapWordsPerLong); 588} 589 590// Clamp an address to be within a specific page 591// 1. If addr is on the page it is returned as is 592// 2. If addr is above the page_address the start of the *next* page will be returned 593// 3. Otherwise, if addr is below the page_address the start of the page will be returned 594template <typename T> 595inline T* clamp_address_in_page(T* addr, T* page_address, size_t page_size) { 596 if (align_ptr_down(addr, page_size) == align_ptr_down(page_address, page_size)) { 597 // address is in the specified page, just return it as is 598 return addr; 599 } else if (addr > page_address) { 600 // address is above specified page, return start of next page 601 return align_ptr_down(page_address, page_size) + page_size; 602 } else { 603 // address is below specified page, return start of page 604 return align_ptr_down(page_address, page_size); 605 } 606} 607 608 609// The expected size in bytes of a cache line, used to pad data structures. 610#ifndef DEFAULT_CACHE_LINE_SIZE 611 #define DEFAULT_CACHE_LINE_SIZE 64 612#endif 613 614 615//---------------------------------------------------------------------------------------------------- 616// Utility macros for compilers 617// used to silence compiler warnings 618 619#define Unused_Variable(var) var 620 621 622//---------------------------------------------------------------------------------------------------- 623// Miscellaneous 624 625// 6302670 Eliminate Hotspot __fabsf dependency 626// All fabs() callers should call this function instead, which will implicitly 627// convert the operand to double, avoiding a dependency on __fabsf which 628// doesn't exist in early versions of Solaris 8. 629inline double fabsd(double value) { 630 return fabs(value); 631} 632 633// Returns numerator/denominator as percentage value from 0 to 100. If denominator 634// is zero, return 0.0. 635template<typename T> 636inline double percent_of(T numerator, T denominator) { 637 return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0; 638} 639 640//---------------------------------------------------------------------------------------------------- 641// Special casts 642// Cast floats into same-size integers and vice-versa w/o changing bit-pattern 643typedef union { 644 jfloat f; 645 jint i; 646} FloatIntConv; 647 648typedef union { 649 jdouble d; 650 jlong l; 651 julong ul; 652} DoubleLongConv; 653 654inline jint jint_cast (jfloat x) { return ((FloatIntConv*)&x)->i; } 655inline jfloat jfloat_cast (jint x) { return ((FloatIntConv*)&x)->f; } 656 657inline jlong jlong_cast (jdouble x) { return ((DoubleLongConv*)&x)->l; } 658inline julong julong_cast (jdouble x) { return ((DoubleLongConv*)&x)->ul; } 659inline jdouble jdouble_cast (jlong x) { return ((DoubleLongConv*)&x)->d; } 660 661inline jint low (jlong value) { return jint(value); } 662inline jint high(jlong value) { return jint(value >> 32); } 663 664// the fancy casts are a hopefully portable way 665// to do unsigned 32 to 64 bit type conversion 666inline void set_low (jlong* value, jint low ) { *value &= (jlong)0xffffffff << 32; 667 *value |= (jlong)(julong)(juint)low; } 668 669inline void set_high(jlong* value, jint high) { *value &= (jlong)(julong)(juint)0xffffffff; 670 *value |= (jlong)high << 32; } 671 672inline jlong jlong_from(jint h, jint l) { 673 jlong result = 0; // initialization to avoid warning 674 set_high(&result, h); 675 set_low(&result, l); 676 return result; 677} 678 679union jlong_accessor { 680 jint words[2]; 681 jlong long_value; 682}; 683 684void basic_types_init(); // cannot define here; uses assert 685 686 687// NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 688enum BasicType { 689 T_BOOLEAN = 4, 690 T_CHAR = 5, 691 T_FLOAT = 6, 692 T_DOUBLE = 7, 693 T_BYTE = 8, 694 T_SHORT = 9, 695 T_INT = 10, 696 T_LONG = 11, 697 T_OBJECT = 12, 698 T_ARRAY = 13, 699 T_VOID = 14, 700 T_ADDRESS = 15, 701 T_NARROWOOP = 16, 702 T_METADATA = 17, 703 T_NARROWKLASS = 18, 704 T_CONFLICT = 19, // for stack value type with conflicting contents 705 T_ILLEGAL = 99 706}; 707 708inline bool is_java_primitive(BasicType t) { 709 return T_BOOLEAN <= t && t <= T_LONG; 710} 711 712inline bool is_subword_type(BasicType t) { 713 // these guys are processed exactly like T_INT in calling sequences: 714 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT); 715} 716 717inline bool is_signed_subword_type(BasicType t) { 718 return (t == T_BYTE || t == T_SHORT); 719} 720 721// Convert a char from a classfile signature to a BasicType 722inline BasicType char2type(char c) { 723 switch( c ) { 724 case 'B': return T_BYTE; 725 case 'C': return T_CHAR; 726 case 'D': return T_DOUBLE; 727 case 'F': return T_FLOAT; 728 case 'I': return T_INT; 729 case 'J': return T_LONG; 730 case 'S': return T_SHORT; 731 case 'Z': return T_BOOLEAN; 732 case 'V': return T_VOID; 733 case 'L': return T_OBJECT; 734 case '[': return T_ARRAY; 735 } 736 return T_ILLEGAL; 737} 738 739extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 740inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; } 741extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements 742extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a jchar 743inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; } 744extern BasicType name2type(const char* name); 745 746// Auxiliary math routines 747// least common multiple 748extern size_t lcm(size_t a, size_t b); 749 750 751// NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java 752enum BasicTypeSize { 753 T_BOOLEAN_size = 1, 754 T_CHAR_size = 1, 755 T_FLOAT_size = 1, 756 T_DOUBLE_size = 2, 757 T_BYTE_size = 1, 758 T_SHORT_size = 1, 759 T_INT_size = 1, 760 T_LONG_size = 2, 761 T_OBJECT_size = 1, 762 T_ARRAY_size = 1, 763 T_NARROWOOP_size = 1, 764 T_NARROWKLASS_size = 1, 765 T_VOID_size = 0 766}; 767 768 769// maps a BasicType to its instance field storage type: 770// all sub-word integral types are widened to T_INT 771extern BasicType type2field[T_CONFLICT+1]; 772extern BasicType type2wfield[T_CONFLICT+1]; 773 774 775// size in bytes 776enum ArrayElementSize { 777 T_BOOLEAN_aelem_bytes = 1, 778 T_CHAR_aelem_bytes = 2, 779 T_FLOAT_aelem_bytes = 4, 780 T_DOUBLE_aelem_bytes = 8, 781 T_BYTE_aelem_bytes = 1, 782 T_SHORT_aelem_bytes = 2, 783 T_INT_aelem_bytes = 4, 784 T_LONG_aelem_bytes = 8, 785#ifdef _LP64 786 T_OBJECT_aelem_bytes = 8, 787 T_ARRAY_aelem_bytes = 8, 788#else 789 T_OBJECT_aelem_bytes = 4, 790 T_ARRAY_aelem_bytes = 4, 791#endif 792 T_NARROWOOP_aelem_bytes = 4, 793 T_NARROWKLASS_aelem_bytes = 4, 794 T_VOID_aelem_bytes = 0 795}; 796 797extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element 798#ifdef ASSERT 799extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts 800#else 801inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; } 802#endif 803 804 805// JavaValue serves as a container for arbitrary Java values. 806 807class JavaValue { 808 809 public: 810 typedef union JavaCallValue { 811 jfloat f; 812 jdouble d; 813 jint i; 814 jlong l; 815 jobject h; 816 } JavaCallValue; 817 818 private: 819 BasicType _type; 820 JavaCallValue _value; 821 822 public: 823 JavaValue(BasicType t = T_ILLEGAL) { _type = t; } 824 825 JavaValue(jfloat value) { 826 _type = T_FLOAT; 827 _value.f = value; 828 } 829 830 JavaValue(jdouble value) { 831 _type = T_DOUBLE; 832 _value.d = value; 833 } 834 835 jfloat get_jfloat() const { return _value.f; } 836 jdouble get_jdouble() const { return _value.d; } 837 jint get_jint() const { return _value.i; } 838 jlong get_jlong() const { return _value.l; } 839 jobject get_jobject() const { return _value.h; } 840 JavaCallValue* get_value_addr() { return &_value; } 841 BasicType get_type() const { return _type; } 842 843 void set_jfloat(jfloat f) { _value.f = f;} 844 void set_jdouble(jdouble d) { _value.d = d;} 845 void set_jint(jint i) { _value.i = i;} 846 void set_jlong(jlong l) { _value.l = l;} 847 void set_jobject(jobject h) { _value.h = h;} 848 void set_type(BasicType t) { _type = t; } 849 850 jboolean get_jboolean() const { return (jboolean) (_value.i);} 851 jbyte get_jbyte() const { return (jbyte) (_value.i);} 852 jchar get_jchar() const { return (jchar) (_value.i);} 853 jshort get_jshort() const { return (jshort) (_value.i);} 854 855}; 856 857 858#define STACK_BIAS 0 859// V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff 860// in order to extend the reach of the stack pointer. 861#if defined(SPARC) && defined(_LP64) 862#undef STACK_BIAS 863#define STACK_BIAS 0x7ff 864#endif 865 866 867// TosState describes the top-of-stack state before and after the execution of 868// a bytecode or method. The top-of-stack value may be cached in one or more CPU 869// registers. The TosState corresponds to the 'machine representation' of this cached 870// value. There's 4 states corresponding to the JAVA types int, long, float & double 871// as well as a 5th state in case the top-of-stack value is actually on the top 872// of stack (in memory) and thus not cached. The atos state corresponds to the itos 873// state when it comes to machine representation but is used separately for (oop) 874// type specific operations (e.g. verification code). 875 876enum TosState { // describes the tos cache contents 877 btos = 0, // byte, bool tos cached 878 ztos = 1, // byte, bool tos cached 879 ctos = 2, // char tos cached 880 stos = 3, // short tos cached 881 itos = 4, // int tos cached 882 ltos = 5, // long tos cached 883 ftos = 6, // float tos cached 884 dtos = 7, // double tos cached 885 atos = 8, // object cached 886 vtos = 9, // tos not cached 887 number_of_states, 888 ilgl // illegal state: should not occur 889}; 890 891 892inline TosState as_TosState(BasicType type) { 893 switch (type) { 894 case T_BYTE : return btos; 895 case T_BOOLEAN: return ztos; 896 case T_CHAR : return ctos; 897 case T_SHORT : return stos; 898 case T_INT : return itos; 899 case T_LONG : return ltos; 900 case T_FLOAT : return ftos; 901 case T_DOUBLE : return dtos; 902 case T_VOID : return vtos; 903 case T_ARRAY : // fall through 904 case T_OBJECT : return atos; 905 } 906 return ilgl; 907} 908 909inline BasicType as_BasicType(TosState state) { 910 switch (state) { 911 case btos : return T_BYTE; 912 case ztos : return T_BOOLEAN; 913 case ctos : return T_CHAR; 914 case stos : return T_SHORT; 915 case itos : return T_INT; 916 case ltos : return T_LONG; 917 case ftos : return T_FLOAT; 918 case dtos : return T_DOUBLE; 919 case atos : return T_OBJECT; 920 case vtos : return T_VOID; 921 } 922 return T_ILLEGAL; 923} 924 925 926// Helper function to convert BasicType info into TosState 927// Note: Cannot define here as it uses global constant at the time being. 928TosState as_TosState(BasicType type); 929 930 931// JavaThreadState keeps track of which part of the code a thread is executing in. This 932// information is needed by the safepoint code. 933// 934// There are 4 essential states: 935// 936// _thread_new : Just started, but not executed init. code yet (most likely still in OS init code) 937// _thread_in_native : In native code. This is a safepoint region, since all oops will be in jobject handles 938// _thread_in_vm : Executing in the vm 939// _thread_in_Java : Executing either interpreted or compiled Java code (or could be in a stub) 940// 941// Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in 942// a transition from one state to another. These extra states makes it possible for the safepoint code to 943// handle certain thread_states without having to suspend the thread - making the safepoint code faster. 944// 945// Given a state, the xxxx_trans state can always be found by adding 1. 946// 947enum JavaThreadState { 948 _thread_uninitialized = 0, // should never happen (missing initialization) 949 _thread_new = 2, // just starting up, i.e., in process of being initialized 950 _thread_new_trans = 3, // corresponding transition state (not used, included for completness) 951 _thread_in_native = 4, // running in native code 952 _thread_in_native_trans = 5, // corresponding transition state 953 _thread_in_vm = 6, // running in VM 954 _thread_in_vm_trans = 7, // corresponding transition state 955 _thread_in_Java = 8, // running in Java or in stub code 956 _thread_in_Java_trans = 9, // corresponding transition state (not used, included for completness) 957 _thread_blocked = 10, // blocked in vm 958 _thread_blocked_trans = 11, // corresponding transition state 959 _thread_max_state = 12 // maximum thread state+1 - used for statistics allocation 960}; 961 962 963 964//---------------------------------------------------------------------------------------------------- 965// 'Forward' declarations of frequently used classes 966// (in order to reduce interface dependencies & reduce 967// number of unnecessary compilations after changes) 968 969class ClassFileStream; 970 971class Event; 972 973class Thread; 974class VMThread; 975class JavaThread; 976class Threads; 977 978class VM_Operation; 979class VMOperationQueue; 980 981class CodeBlob; 982class CompiledMethod; 983class nmethod; 984class RuntimeBlob; 985class OSRAdapter; 986class I2CAdapter; 987class C2IAdapter; 988class CompiledIC; 989class relocInfo; 990class ScopeDesc; 991class PcDesc; 992 993class Recompiler; 994class Recompilee; 995class RecompilationPolicy; 996class RFrame; 997class CompiledRFrame; 998class InterpretedRFrame; 999 1000class vframe; 1001class javaVFrame; 1002class interpretedVFrame; 1003class compiledVFrame; 1004class deoptimizedVFrame; 1005class externalVFrame; 1006class entryVFrame; 1007 1008class RegisterMap; 1009 1010class Mutex; 1011class Monitor; 1012class BasicLock; 1013class BasicObjectLock; 1014 1015class PeriodicTask; 1016 1017class JavaCallWrapper; 1018 1019class oopDesc; 1020class metaDataOopDesc; 1021 1022class NativeCall; 1023 1024class zone; 1025 1026class StubQueue; 1027 1028class outputStream; 1029 1030class ResourceArea; 1031 1032class DebugInformationRecorder; 1033class ScopeValue; 1034class CompressedStream; 1035class DebugInfoReadStream; 1036class DebugInfoWriteStream; 1037class LocationValue; 1038class ConstantValue; 1039class IllegalValue; 1040 1041class PrivilegedElement; 1042class MonitorArray; 1043 1044class MonitorInfo; 1045 1046class OffsetClosure; 1047class OopMapCache; 1048class InterpreterOopMap; 1049class OopMapCacheEntry; 1050class OSThread; 1051 1052typedef int (*OSThreadStartFunc)(void*); 1053 1054class Space; 1055 1056class JavaValue; 1057class methodHandle; 1058class JavaCallArguments; 1059 1060// Basic support for errors. 1061extern void basic_fatal(const char* msg); 1062 1063//---------------------------------------------------------------------------------------------------- 1064// Special constants for debugging 1065 1066const jint badInt = -3; // generic "bad int" value 1067const long badAddressVal = -2; // generic "bad address" value 1068const long badOopVal = -1; // generic "bad oop" value 1069const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC 1070const int badHandleValue = 0xBC; // value used to zap vm handle area 1071const int badResourceValue = 0xAB; // value used to zap resource area 1072const int freeBlockPad = 0xBA; // value used to pad freed blocks. 1073const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks. 1074const juint uninitMetaWordVal= 0xf7f7f7f7; // value used to zap newly allocated metachunk 1075const intptr_t badJNIHandleVal = (intptr_t) UCONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area 1076const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC 1077const juint badMetaWordVal = 0xBAADFADE; // value used to zap metadata heap after GC 1078const int badCodeHeapNewVal= 0xCC; // value used to zap Code heap at allocation 1079const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation 1080 1081 1082// (These must be implemented as #defines because C++ compilers are 1083// not obligated to inline non-integral constants!) 1084#define badAddress ((address)::badAddressVal) 1085#define badOop (cast_to_oop(::badOopVal)) 1086#define badHeapWord (::badHeapWordVal) 1087#define badJNIHandle (cast_to_oop(::badJNIHandleVal)) 1088 1089// Default TaskQueue size is 16K (32-bit) or 128K (64-bit) 1090#define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17)) 1091 1092//---------------------------------------------------------------------------------------------------- 1093// Utility functions for bitfield manipulations 1094 1095const intptr_t AllBits = ~0; // all bits set in a word 1096const intptr_t NoBits = 0; // no bits set in a word 1097const jlong NoLongBits = 0; // no bits set in a long 1098const intptr_t OneBit = 1; // only right_most bit set in a word 1099 1100// get a word with the n.th or the right-most or left-most n bits set 1101// (note: #define used only so that they can be used in enum constant definitions) 1102#define nth_bit(n) (((n) >= BitsPerWord) ? 0 : (OneBit << (n))) 1103#define right_n_bits(n) (nth_bit(n) - 1) 1104#define left_n_bits(n) (right_n_bits(n) << (((n) >= BitsPerWord) ? 0 : (BitsPerWord - (n)))) 1105 1106// bit-operations using a mask m 1107inline void set_bits (intptr_t& x, intptr_t m) { x |= m; } 1108inline void clear_bits (intptr_t& x, intptr_t m) { x &= ~m; } 1109inline intptr_t mask_bits (intptr_t x, intptr_t m) { return x & m; } 1110inline jlong mask_long_bits (jlong x, jlong m) { return x & m; } 1111inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; } 1112 1113// bit-operations using the n.th bit 1114inline void set_nth_bit(intptr_t& x, int n) { set_bits (x, nth_bit(n)); } 1115inline void clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); } 1116inline bool is_set_nth_bit(intptr_t x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; } 1117 1118// returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!) 1119inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) { 1120 return mask_bits(x >> start_bit_no, right_n_bits(field_length)); 1121} 1122 1123 1124//---------------------------------------------------------------------------------------------------- 1125// Utility functions for integers 1126 1127// Avoid use of global min/max macros which may cause unwanted double 1128// evaluation of arguments. 1129#ifdef max 1130#undef max 1131#endif 1132 1133#ifdef min 1134#undef min 1135#endif 1136 1137// The following defines serve the purpose of preventing use of accidentally 1138// included min max macros from compiling, while continuing to allow innocent 1139// min and max identifiers in the code to compile as intended. 1140#define max max 1141#define min min 1142 1143// It is necessary to use templates here. Having normal overloaded 1144// functions does not work because it is necessary to provide both 32- 1145// and 64-bit overloaded functions, which does not work, and having 1146// explicitly-typed versions of these routines (i.e., MAX2I, MAX2L) 1147// will be even more error-prone than macros. 1148template<class T> inline T MAX2(T a, T b) { return (a > b) ? a : b; } 1149template<class T> inline T MIN2(T a, T b) { return (a < b) ? a : b; } 1150template<class T> inline T MAX3(T a, T b, T c) { return MAX2(MAX2(a, b), c); } 1151template<class T> inline T MIN3(T a, T b, T c) { return MIN2(MIN2(a, b), c); } 1152template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); } 1153template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); } 1154 1155template<class T> inline T ABS(T x) { return (x > 0) ? x : -x; } 1156 1157// true if x is a power of 2, false otherwise 1158inline bool is_power_of_2(intptr_t x) { 1159 return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits)); 1160} 1161 1162// long version of is_power_of_2 1163inline bool is_power_of_2_long(jlong x) { 1164 return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits)); 1165} 1166 1167// Returns largest i such that 2^i <= x. 1168// If x < 0, the function returns 31 on a 32-bit machine and 63 on a 64-bit machine. 1169// If x == 0, the function returns -1. 1170inline int log2_intptr(intptr_t x) { 1171 int i = -1; 1172 uintptr_t p = 1; 1173 while (p != 0 && p <= (uintptr_t)x) { 1174 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1175 i++; p *= 2; 1176 } 1177 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1178 // If p = 0, overflow has occurred and i = 31 or i = 63 (depending on the machine word size). 1179 return i; 1180} 1181 1182//* largest i such that 2^i <= x 1183// A negative value of 'x' will return '63' 1184inline int log2_long(jlong x) { 1185 int i = -1; 1186 julong p = 1; 1187 while (p != 0 && p <= (julong)x) { 1188 // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x) 1189 i++; p *= 2; 1190 } 1191 // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1)) 1192 // (if p = 0 then overflow occurred and i = 63) 1193 return i; 1194} 1195 1196//* the argument must be exactly a power of 2 1197inline int exact_log2(intptr_t x) { 1198 assert(is_power_of_2(x), "x must be a power of 2: " INTPTR_FORMAT, x); 1199 return log2_intptr(x); 1200} 1201 1202//* the argument must be exactly a power of 2 1203inline int exact_log2_long(jlong x) { 1204 assert(is_power_of_2_long(x), "x must be a power of 2: " JLONG_FORMAT, x); 1205 return log2_long(x); 1206} 1207 1208 1209// returns integer round-up to the nearest multiple of s (s must be a power of two) 1210inline intptr_t round_to(intptr_t x, uintx s) { 1211 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s); 1212 const uintx m = s - 1; 1213 return mask_bits(x + m, ~m); 1214} 1215 1216// returns integer round-down to the nearest multiple of s (s must be a power of two) 1217inline intptr_t round_down(intptr_t x, uintx s) { 1218 assert(is_power_of_2(s), "s must be a power of 2: " UINTX_FORMAT, s); 1219 const uintx m = s - 1; 1220 return mask_bits(x, ~m); 1221} 1222 1223 1224inline bool is_odd (intx x) { return x & 1; } 1225inline bool is_even(intx x) { return !is_odd(x); } 1226 1227// "to" should be greater than "from." 1228inline intx byte_size(void* from, void* to) { 1229 return (address)to - (address)from; 1230} 1231 1232//---------------------------------------------------------------------------------------------------- 1233// Avoid non-portable casts with these routines (DEPRECATED) 1234 1235// NOTE: USE Bytes class INSTEAD WHERE POSSIBLE 1236// Bytes is optimized machine-specifically and may be much faster then the portable routines below. 1237 1238// Given sequence of four bytes, build into a 32-bit word 1239// following the conventions used in class files. 1240// On the 386, this could be realized with a simple address cast. 1241// 1242 1243// This routine takes eight bytes: 1244inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1245 return (( u8(c1) << 56 ) & ( u8(0xff) << 56 )) 1246 | (( u8(c2) << 48 ) & ( u8(0xff) << 48 )) 1247 | (( u8(c3) << 40 ) & ( u8(0xff) << 40 )) 1248 | (( u8(c4) << 32 ) & ( u8(0xff) << 32 )) 1249 | (( u8(c5) << 24 ) & ( u8(0xff) << 24 )) 1250 | (( u8(c6) << 16 ) & ( u8(0xff) << 16 )) 1251 | (( u8(c7) << 8 ) & ( u8(0xff) << 8 )) 1252 | (( u8(c8) << 0 ) & ( u8(0xff) << 0 )); 1253} 1254 1255// This routine takes four bytes: 1256inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1257 return (( u4(c1) << 24 ) & 0xff000000) 1258 | (( u4(c2) << 16 ) & 0x00ff0000) 1259 | (( u4(c3) << 8 ) & 0x0000ff00) 1260 | (( u4(c4) << 0 ) & 0x000000ff); 1261} 1262 1263// And this one works if the four bytes are contiguous in memory: 1264inline u4 build_u4_from( u1* p ) { 1265 return build_u4_from( p[0], p[1], p[2], p[3] ); 1266} 1267 1268// Ditto for two-byte ints: 1269inline u2 build_u2_from( u1 c1, u1 c2 ) { 1270 return u2((( u2(c1) << 8 ) & 0xff00) 1271 | (( u2(c2) << 0 ) & 0x00ff)); 1272} 1273 1274// And this one works if the two bytes are contiguous in memory: 1275inline u2 build_u2_from( u1* p ) { 1276 return build_u2_from( p[0], p[1] ); 1277} 1278 1279// Ditto for floats: 1280inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) { 1281 u4 u = build_u4_from( c1, c2, c3, c4 ); 1282 return *(jfloat*)&u; 1283} 1284 1285inline jfloat build_float_from( u1* p ) { 1286 u4 u = build_u4_from( p ); 1287 return *(jfloat*)&u; 1288} 1289 1290 1291// now (64-bit) longs 1292 1293inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1294 return (( jlong(c1) << 56 ) & ( jlong(0xff) << 56 )) 1295 | (( jlong(c2) << 48 ) & ( jlong(0xff) << 48 )) 1296 | (( jlong(c3) << 40 ) & ( jlong(0xff) << 40 )) 1297 | (( jlong(c4) << 32 ) & ( jlong(0xff) << 32 )) 1298 | (( jlong(c5) << 24 ) & ( jlong(0xff) << 24 )) 1299 | (( jlong(c6) << 16 ) & ( jlong(0xff) << 16 )) 1300 | (( jlong(c7) << 8 ) & ( jlong(0xff) << 8 )) 1301 | (( jlong(c8) << 0 ) & ( jlong(0xff) << 0 )); 1302} 1303 1304inline jlong build_long_from( u1* p ) { 1305 return build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] ); 1306} 1307 1308 1309// Doubles, too! 1310inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) { 1311 jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 ); 1312 return *(jdouble*)&u; 1313} 1314 1315inline jdouble build_double_from( u1* p ) { 1316 jlong u = build_long_from( p ); 1317 return *(jdouble*)&u; 1318} 1319 1320 1321// Portable routines to go the other way: 1322 1323inline void explode_short_to( u2 x, u1& c1, u1& c2 ) { 1324 c1 = u1(x >> 8); 1325 c2 = u1(x); 1326} 1327 1328inline void explode_short_to( u2 x, u1* p ) { 1329 explode_short_to( x, p[0], p[1]); 1330} 1331 1332inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) { 1333 c1 = u1(x >> 24); 1334 c2 = u1(x >> 16); 1335 c3 = u1(x >> 8); 1336 c4 = u1(x); 1337} 1338 1339inline void explode_int_to( u4 x, u1* p ) { 1340 explode_int_to( x, p[0], p[1], p[2], p[3]); 1341} 1342 1343 1344// Pack and extract shorts to/from ints: 1345 1346inline int extract_low_short_from_int(jint x) { 1347 return x & 0xffff; 1348} 1349 1350inline int extract_high_short_from_int(jint x) { 1351 return (x >> 16) & 0xffff; 1352} 1353 1354inline int build_int_from_shorts( jushort low, jushort high ) { 1355 return ((int)((unsigned int)high << 16) | (unsigned int)low); 1356} 1357 1358// Convert pointer to intptr_t, for use in printing pointers. 1359inline intptr_t p2i(const void * p) { 1360 return (intptr_t) p; 1361} 1362 1363// swap a & b 1364template<class T> static void swap(T& a, T& b) { 1365 T tmp = a; 1366 a = b; 1367 b = tmp; 1368} 1369 1370#define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0])) 1371 1372//---------------------------------------------------------------------------------------------------- 1373// Sum and product which can never overflow: they wrap, just like the 1374// Java operations. Note that we don't intend these to be used for 1375// general-purpose arithmetic: their purpose is to emulate Java 1376// operations. 1377 1378// The goal of this code to avoid undefined or implementation-defined 1379// behavior. The use of an lvalue to reference cast is explicitly 1380// permitted by Lvalues and rvalues [basic.lval]. [Section 3.10 Para 1381// 15 in C++03] 1382#define JAVA_INTEGER_OP(OP, NAME, TYPE, UNSIGNED_TYPE) \ 1383inline TYPE NAME (TYPE in1, TYPE in2) { \ 1384 UNSIGNED_TYPE ures = static_cast<UNSIGNED_TYPE>(in1); \ 1385 ures OP ## = static_cast<UNSIGNED_TYPE>(in2); \ 1386 return reinterpret_cast<TYPE&>(ures); \ 1387} 1388 1389JAVA_INTEGER_OP(+, java_add, jint, juint) 1390JAVA_INTEGER_OP(-, java_subtract, jint, juint) 1391JAVA_INTEGER_OP(*, java_multiply, jint, juint) 1392JAVA_INTEGER_OP(+, java_add, jlong, julong) 1393JAVA_INTEGER_OP(-, java_subtract, jlong, julong) 1394JAVA_INTEGER_OP(*, java_multiply, jlong, julong) 1395 1396#undef JAVA_INTEGER_OP 1397 1398// Dereference vptr 1399// All C++ compilers that we know of have the vtbl pointer in the first 1400// word. If there are exceptions, this function needs to be made compiler 1401// specific. 1402static inline void* dereference_vptr(const void* addr) { 1403 return *(void**)addr; 1404} 1405 1406#endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP 1407