jdk8-mips64-public/hotspot: src/share/vm/utilities/globalDefinitions.hpp@c90e76575b03 (annotated)

src/share/vm/utilities/globalDefinitions.hpp@c90e76575b03 (annotated)

src/share/vm/utilities/globalDefinitions.hpp

Tue, 08 Oct 2013 09:33:51 +0100

author: kevinw
date: Tue, 08 Oct 2013 09:33:51 +0100
changeset 5850: c90e76575b03
parent 5784: 190899198332
child 5865: aa6f2ea19d8f
permissions: -rw-r--r--

8019375: Internal symbol table size should be tunable.
Reviewed-by: coleenp, kamg

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
 #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
 #endif
 #ifdef TARGET_COMPILER_gcc
 # include "utilities/globalDefinitions_gcc.hpp"
 #endif
 #ifdef TARGET_COMPILER_visCPP
 # include "utilities/globalDefinitions_visCPP.hpp"
 #endif
 #ifdef TARGET_COMPILER_sparcWorks
 # include "utilities/globalDefinitions_sparcWorks.hpp"
 #endif
 #include "utilities/macros.hpp"
 // This file holds all globally used constants & types, class (forward)
 // declarations and a few frequently used utility functions.
 //----------------------------------------------------------------------------------------------------
 // Constants
 const int LogBytesPerShort   = 1;
 const int LogBytesPerInt     = 2;
 #ifdef _LP64
 const int LogBytesPerWord    = 3;
 #else
 const int LogBytesPerWord    = 2;
 #endif
 const int LogBytesPerLong    = 3;
 const int BytesPerShort      = 1 << LogBytesPerShort;
 const int BytesPerInt        = 1 << LogBytesPerInt;
 const int BytesPerWord       = 1 << LogBytesPerWord;
 const int BytesPerLong       = 1 << LogBytesPerLong;
 const int LogBitsPerByte     = 3;
 const int LogBitsPerShort    = LogBitsPerByte + LogBytesPerShort;
 const int LogBitsPerInt      = LogBitsPerByte + LogBytesPerInt;
 const int LogBitsPerWord     = LogBitsPerByte + LogBytesPerWord;
 const int LogBitsPerLong     = LogBitsPerByte + LogBytesPerLong;
 const int BitsPerByte        = 1 << LogBitsPerByte;
 const int BitsPerShort       = 1 << LogBitsPerShort;
 const int BitsPerInt         = 1 << LogBitsPerInt;
 const int BitsPerWord        = 1 << LogBitsPerWord;
 const int BitsPerLong        = 1 << LogBitsPerLong;
 const int WordAlignmentMask  = (1 << LogBytesPerWord) - 1;
 const int LongAlignmentMask  = (1 << LogBytesPerLong) - 1;
 const int WordsPerLong       = 2;       // Number of stack entries for longs
 const int oopSize            = sizeof(char*); // Full-width oop
 extern int heapOopSize;                       // Oop within a java object
 const int wordSize           = sizeof(char*);
 const int longSize           = sizeof(jlong);
 const int jintSize           = sizeof(jint);
 const int size_tSize         = sizeof(size_t);
 const int BytesPerOop        = BytesPerWord;  // Full-width oop
 extern int LogBytesPerHeapOop;                // Oop within a java object
 extern int LogBitsPerHeapOop;
 extern int BytesPerHeapOop;
 extern int BitsPerHeapOop;
 // Oop encoding heap max
 extern uint64_t OopEncodingHeapMax;
 const int BitsPerJavaInteger = 32;
 const int BitsPerJavaLong    = 64;
 const int BitsPerSize_t      = size_tSize * BitsPerByte;
 // Size of a char[] needed to represent a jint as a string in decimal.
 const int jintAsStringSize = 12;
 // In fact this should be
 // log2_intptr(sizeof(class JavaThread)) - log2_intptr(64);
 // see os::set_memory_serialize_page()
 #ifdef _LP64
 const int SerializePageShiftCount = 4;
 #else
 const int SerializePageShiftCount = 3;
 #endif
 // An opaque struct of heap-word width, so that HeapWord* can be a generic
 // pointer into the heap.  We require that object sizes be measured in
 // units of heap words, so that that
 //   HeapWord* hw;
 //   hw += oop(hw)->foo();
 // works, where foo is a method (like size or scavenge) that returns the
 // object size.
 class HeapWord {
   friend class VMStructs;
  private:
   char* i;
 #ifndef PRODUCT
  public:
   char* value() { return i; }
 #endif
 };
 // Analogous opaque struct for metadata allocated from
 // metaspaces.
 class MetaWord {
   friend class VMStructs;
  private:
   char* i;
 };
 // HeapWordSize must be 2^LogHeapWordSize.
 const int HeapWordSize        = sizeof(HeapWord);
 #ifdef _LP64
 const int LogHeapWordSize     = 3;
 #else
 const int LogHeapWordSize     = 2;
 #endif
 const int HeapWordsPerLong    = BytesPerLong / HeapWordSize;
 const int LogHeapWordsPerLong = LogBytesPerLong - LogHeapWordSize;
 // The larger HeapWordSize for 64bit requires larger heaps
 // for the same application running in 64bit.  See bug 4967770.
 // The minimum alignment to a heap word size is done.  Other
 // parts of the memory system may required additional alignment
 // and are responsible for those alignments.
 #ifdef _LP64
 #define ScaleForWordSize(x) align_size_down_((x) * 13 / 10, HeapWordSize)
 #else
 #define ScaleForWordSize(x) (x)
 #endif
 // The minimum number of native machine words necessary to contain "byte_size"
 // bytes.
 inline size_t heap_word_size(size_t byte_size) {
   return (byte_size + (HeapWordSize-1)) >> LogHeapWordSize;
 }
 const size_t K                  = 1024;
 const size_t M                  = K*K;
 const size_t G                  = M*K;
 const size_t HWperKB            = K / sizeof(HeapWord);
 const jint min_jint = (jint)1 << (sizeof(jint)*BitsPerByte-1); // 0x80000000 == smallest jint
 const jint max_jint = (juint)min_jint - 1;                     // 0x7FFFFFFF == largest jint
 // Constants for converting from a base unit to milli-base units.  For
 // example from seconds to milliseconds and microseconds
 const int MILLIUNITS    = 1000;         // milli units per base unit
 const int MICROUNITS    = 1000000;      // micro units per base unit
 const int NANOUNITS     = 1000000000;   // nano units per base unit
 const jlong NANOSECS_PER_SEC      = CONST64(1000000000);
 const jint  NANOSECS_PER_MILLISEC = 1000000;
 inline const char* proper_unit_for_byte_size(size_t s) {
 #ifdef _LP64
   if (s >= 10*G) {
     return "G";
   }
 #endif
   if (s >= 10*M) {
     return "M";
   } else if (s >= 10*K) {
     return "K";
   } else {
     return "B";
   }
 }
 template <class T>
 inline T byte_size_in_proper_unit(T s) {
 #ifdef _LP64
   if (s >= 10*G) {
     return (T)(s/G);
   }
 #endif
   if (s >= 10*M) {
     return (T)(s/M);
   } else if (s >= 10*K) {
     return (T)(s/K);
   } else {
     return s;
   }
 }
 //----------------------------------------------------------------------------------------------------
 // VM type definitions
 // intx and uintx are the 'extended' int and 'extended' unsigned int types;
 // they are 32bit wide on a 32-bit platform, and 64bit wide on a 64bit platform.
 typedef intptr_t  intx;
 typedef uintptr_t uintx;
 const intx  min_intx  = (intx)1 << (sizeof(intx)*BitsPerByte-1);
 const intx  max_intx  = (uintx)min_intx - 1;
 const uintx max_uintx = (uintx)-1;
 // Table of values:
 //      sizeof intx         4               8
 // min_intx             0x80000000      0x8000000000000000
 // max_intx             0x7FFFFFFF      0x7FFFFFFFFFFFFFFF
 // max_uintx            0xFFFFFFFF      0xFFFFFFFFFFFFFFFF
 typedef unsigned int uint;   NEEDS_CLEANUP
 //----------------------------------------------------------------------------------------------------
 // Java type definitions
 // All kinds of 'plain' byte addresses
 typedef   signed char s_char;
 typedef unsigned char u_char;
 typedef u_char*       address;
 typedef uintptr_t     address_word; // unsigned integer which will hold a pointer
                                     // except for some implementations of a C++
                                     // linkage pointer to function. Should never
                                     // need one of those to be placed in this
                                     // type anyway.
 //  Utility functions to "portably" (?) bit twiddle pointers
 //  Where portable means keep ANSI C++ compilers quiet
 inline address       set_address_bits(address x, int m)       { return address(intptr_t(x) | m); }
 inline address       clear_address_bits(address x, int m)     { return address(intptr_t(x) & ~m); }
 //  Utility functions to "portably" make cast to/from function pointers.
 inline address_word  mask_address_bits(address x, int m)      { return address_word(x) & m; }
 inline address_word  castable_address(address x)              { return address_word(x) ; }
 inline address_word  castable_address(void* x)                { return address_word(x) ; }
 // Pointer subtraction.
 // The idea here is to avoid ptrdiff_t, which is signed and so doesn't have
 // the range we might need to find differences from one end of the heap
 // to the other.
 // A typical use might be:
 //     if (pointer_delta(end(), top()) >= size) {
 //       // enough room for an object of size
 //       ...
 // and then additions like
 //       ... top() + size ...
 // are safe because we know that top() is at least size below end().
 inline size_t pointer_delta(const void* left,
                             const void* right,
                             size_t element_size) {
   return (((uintptr_t) left) - ((uintptr_t) right)) / element_size;
 }
 // A version specialized for HeapWord*'s.
 inline size_t pointer_delta(const HeapWord* left, const HeapWord* right) {
   return pointer_delta(left, right, sizeof(HeapWord));
 }
 // A version specialized for MetaWord*'s.
 inline size_t pointer_delta(const MetaWord* left, const MetaWord* right) {
   return pointer_delta(left, right, sizeof(MetaWord));
 }
 //
 // ANSI C++ does not allow casting from one pointer type to a function pointer
 // directly without at best a warning. This macro accomplishes it silently
 // In every case that is present at this point the value be cast is a pointer
 // to a C linkage function. In somecase the type used for the cast reflects
 // that linkage and a picky compiler would not complain. In other cases because
 // there is no convenient place to place a typedef with extern C linkage (i.e
 // a platform dependent header file) it doesn't. At this point no compiler seems
 // picky enough to catch these instances (which are few). It is possible that
 // using templates could fix these for all cases. This use of templates is likely
 // so far from the middle of the road that it is likely to be problematic in
 // many C++ compilers.
 //
 #define CAST_TO_FN_PTR(func_type, value) ((func_type)(castable_address(value)))
 #define CAST_FROM_FN_PTR(new_type, func_ptr) ((new_type)((address_word)(func_ptr)))
 // Unsigned byte types for os and stream.hpp
 // Unsigned one, two, four and eigth byte quantities used for describing
 // the .class file format. See JVM book chapter 4.
 typedef jubyte  u1;
 typedef jushort u2;
 typedef juint   u4;
 typedef julong  u8;
 const jubyte  max_jubyte  = (jubyte)-1;  // 0xFF       largest jubyte
 const jushort max_jushort = (jushort)-1; // 0xFFFF     largest jushort
 const juint   max_juint   = (juint)-1;   // 0xFFFFFFFF largest juint
 const julong  max_julong  = (julong)-1;  // 0xFF....FF largest julong
 typedef jbyte  s1;
 typedef jshort s2;
 typedef jint   s4;
 typedef jlong  s8;
 //----------------------------------------------------------------------------------------------------
 // JVM spec restrictions
 const int max_method_code_size = 64*K - 1;  // JVM spec, 2nd ed. section 4.8.1 (p.134)
 //----------------------------------------------------------------------------------------------------
 // Default and minimum StringTableSize values
 const int defaultStringTableSize = NOT_LP64(1009) LP64_ONLY(60013);
 const int minimumStringTableSize=1009;
 const int defaultSymbolTableSize = 20011;
 const int minimumSymbolTableSize = 1009;
 //----------------------------------------------------------------------------------------------------
 // HotSwap - for JVMTI   aka Class File Replacement and PopFrame
 //
 // Determines whether on-the-fly class replacement and frame popping are enabled.
 #define HOTSWAP
 //----------------------------------------------------------------------------------------------------
 // Object alignment, in units of HeapWords.
 //
 // Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
 // reference fields can be naturally aligned.
 extern int MinObjAlignment;
 extern int MinObjAlignmentInBytes;
 extern int MinObjAlignmentInBytesMask;
 extern int LogMinObjAlignment;
 extern int LogMinObjAlignmentInBytes;
 const int LogKlassAlignmentInBytes = 3;
 const int LogKlassAlignment        = LogKlassAlignmentInBytes - LogHeapWordSize;
 const int KlassAlignmentInBytes    = 1 << LogKlassAlignmentInBytes;
 const int KlassAlignment           = KlassAlignmentInBytes / HeapWordSize;
 // Klass encoding metaspace max size
 const uint64_t KlassEncodingMetaspaceMax = (uint64_t(max_juint) + 1) << LogKlassAlignmentInBytes;
 const jlong CompressedKlassPointersBase = NOT_LP64(0) LP64_ONLY(CONST64(0x800000000));  // 32*G
 // Machine dependent stuff
 #ifdef TARGET_ARCH_x86
 # include "globalDefinitions_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "globalDefinitions_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "globalDefinitions_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "globalDefinitions_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "globalDefinitions_ppc.hpp"
 #endif
 /*
  * If a platform does not support native stack walking
  * the platform specific globalDefinitions (above)
  * can set PLATFORM_NATIVE_STACK_WALKING_SUPPORTED to 0
  */
 #ifndef PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
 #define PLATFORM_NATIVE_STACK_WALKING_SUPPORTED 1
 #endif
 // The byte alignment to be used by Arena::Amalloc.  See bugid 4169348.
 // Note: this value must be a power of 2
 #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord)
 // Signed variants of alignment helpers.  There are two versions of each, a macro
 // for use in places like enum definitions that require compile-time constant
 // expressions and a function for all other places so as to get type checking.
 #define align_size_up_(size, alignment) (((size) + ((alignment) - 1)) & ~((alignment) - 1))
 inline bool is_size_aligned(size_t size, size_t alignment) {
   return align_size_up_(size, alignment) == size;
 }
 inline bool is_ptr_aligned(void* ptr, size_t alignment) {
   return align_size_up_((intptr_t)ptr, (intptr_t)alignment) == (intptr_t)ptr;
 }
 inline intptr_t align_size_up(intptr_t size, intptr_t alignment) {
   return align_size_up_(size, alignment);
 }
 #define align_size_down_(size, alignment) ((size) & ~((alignment) - 1))
 inline intptr_t align_size_down(intptr_t size, intptr_t alignment) {
   return align_size_down_(size, alignment);
 }
 #define is_size_aligned_(size, alignment) ((size) == (align_size_up_(size, alignment)))
 inline void* align_ptr_up(void* ptr, size_t alignment) {
   return (void*)align_size_up((intptr_t)ptr, (intptr_t)alignment);
 }
 inline void* align_ptr_down(void* ptr, size_t alignment) {
   return (void*)align_size_down((intptr_t)ptr, (intptr_t)alignment);
 }
 // Align objects by rounding up their size, in HeapWord units.
 #define align_object_size_(size) align_size_up_(size, MinObjAlignment)
 inline intptr_t align_object_size(intptr_t size) {
   return align_size_up(size, MinObjAlignment);
 }
 inline bool is_object_aligned(intptr_t addr) {
   return addr == align_object_size(addr);
 }
 // Pad out certain offsets to jlong alignment, in HeapWord units.
 inline intptr_t align_object_offset(intptr_t offset) {
   return align_size_up(offset, HeapWordsPerLong);
 }
 inline void* align_pointer_up(const void* addr, size_t size) {
   return (void*) align_size_up_((uintptr_t)addr, size);
 }
 // Clamp an address to be within a specific page
 // 1. If addr is on the page it is returned as is
 // 2. If addr is above the page_address the start of the *next* page will be returned
 // 3. Otherwise, if addr is below the page_address the start of the page will be returned
 inline address clamp_address_in_page(address addr, address page_address, intptr_t page_size) {
   if (align_size_down(intptr_t(addr), page_size) == align_size_down(intptr_t(page_address), page_size)) {
     // address is in the specified page, just return it as is
     return addr;
   } else if (addr > page_address) {
     // address is above specified page, return start of next page
     return (address)align_size_down(intptr_t(page_address), page_size) + page_size;
   } else {
     // address is below specified page, return start of page
     return (address)align_size_down(intptr_t(page_address), page_size);
   }
 }
 // The expected size in bytes of a cache line, used to pad data structures.
 #define DEFAULT_CACHE_LINE_SIZE 64
 //----------------------------------------------------------------------------------------------------
 // Utility macros for compilers
 // used to silence compiler warnings
 #define Unused_Variable(var) var
 //----------------------------------------------------------------------------------------------------
 // Miscellaneous
 // 6302670 Eliminate Hotspot __fabsf dependency
 // All fabs() callers should call this function instead, which will implicitly
 // convert the operand to double, avoiding a dependency on __fabsf which
 // doesn't exist in early versions of Solaris 8.
 inline double fabsd(double value) {
   return fabs(value);
 }
 inline jint low (jlong value)                    { return jint(value); }
 inline jint high(jlong value)                    { return jint(value >> 32); }
 // the fancy casts are a hopefully portable way
 // to do unsigned 32 to 64 bit type conversion
 inline void set_low (jlong* value, jint low )    { *value &= (jlong)0xffffffff << 32;
                                                    *value |= (jlong)(julong)(juint)low; }
 inline void set_high(jlong* value, jint high)    { *value &= (jlong)(julong)(juint)0xffffffff;
                                                    *value |= (jlong)high       << 32; }
 inline jlong jlong_from(jint h, jint l) {
   jlong result = 0; // initialization to avoid warning
   set_high(&result, h);
   set_low(&result,  l);
   return result;
 }
 union jlong_accessor {
   jint  words[2];
   jlong long_value;
 };
 void basic_types_init(); // cannot define here; uses assert
 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
 enum BasicType {
   T_BOOLEAN     =  4,
   T_CHAR        =  5,
   T_FLOAT       =  6,
   T_DOUBLE      =  7,
   T_BYTE        =  8,
   T_SHORT       =  9,
   T_INT         = 10,
   T_LONG        = 11,
   T_OBJECT      = 12,
   T_ARRAY       = 13,
   T_VOID        = 14,
   T_ADDRESS     = 15,
   T_NARROWOOP   = 16,
   T_METADATA    = 17,
   T_NARROWKLASS = 18,
   T_CONFLICT    = 19, // for stack value type with conflicting contents
   T_ILLEGAL     = 99
 };
 inline bool is_java_primitive(BasicType t) {
   return T_BOOLEAN <= t && t <= T_LONG;
 }
 inline bool is_subword_type(BasicType t) {
   // these guys are processed exactly like T_INT in calling sequences:
   return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
 }
 inline bool is_signed_subword_type(BasicType t) {
   return (t == T_BYTE || t == T_SHORT);
 }
 // Convert a char from a classfile signature to a BasicType
 inline BasicType char2type(char c) {
   switch( c ) {
   case 'B': return T_BYTE;
   case 'C': return T_CHAR;
   case 'D': return T_DOUBLE;
   case 'F': return T_FLOAT;
   case 'I': return T_INT;
   case 'J': return T_LONG;
   case 'S': return T_SHORT;
   case 'Z': return T_BOOLEAN;
   case 'V': return T_VOID;
   case 'L': return T_OBJECT;
   case '[': return T_ARRAY;
   }
   return T_ILLEGAL;
 }
 extern char type2char_tab[T_CONFLICT+1];     // Map a BasicType to a jchar
 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
 extern int type2size[T_CONFLICT+1];         // Map BasicType to result stack elements
 extern const char* type2name_tab[T_CONFLICT+1];     // Map a BasicType to a jchar
 inline const char* type2name(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2name_tab[t] : NULL; }
 extern BasicType name2type(const char* name);
 // Auxilary math routines
 // least common multiple
 extern size_t lcm(size_t a, size_t b);
 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
 enum BasicTypeSize {
   T_BOOLEAN_size     = 1,
   T_CHAR_size        = 1,
   T_FLOAT_size       = 1,
   T_DOUBLE_size      = 2,
   T_BYTE_size        = 1,
   T_SHORT_size       = 1,
   T_INT_size         = 1,
   T_LONG_size        = 2,
   T_OBJECT_size      = 1,
   T_ARRAY_size       = 1,
   T_NARROWOOP_size   = 1,
   T_NARROWKLASS_size = 1,
   T_VOID_size        = 0
 };
 // maps a BasicType to its instance field storage type:
 // all sub-word integral types are widened to T_INT
 extern BasicType type2field[T_CONFLICT+1];
 extern BasicType type2wfield[T_CONFLICT+1];
 // size in bytes
 enum ArrayElementSize {
   T_BOOLEAN_aelem_bytes     = 1,
   T_CHAR_aelem_bytes        = 2,
   T_FLOAT_aelem_bytes       = 4,
   T_DOUBLE_aelem_bytes      = 8,
   T_BYTE_aelem_bytes        = 1,
   T_SHORT_aelem_bytes       = 2,
   T_INT_aelem_bytes         = 4,
   T_LONG_aelem_bytes        = 8,
 #ifdef _LP64
   T_OBJECT_aelem_bytes      = 8,
   T_ARRAY_aelem_bytes       = 8,
 #else
   T_OBJECT_aelem_bytes      = 4,
   T_ARRAY_aelem_bytes       = 4,
 #endif
   T_NARROWOOP_aelem_bytes   = 4,
   T_NARROWKLASS_aelem_bytes = 4,
   T_VOID_aelem_bytes        = 0
 };
 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
 #ifdef ASSERT
 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
 #else
 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
 #endif
 // JavaValue serves as a container for arbitrary Java values.
 class JavaValue {
  public:
   typedef union JavaCallValue {
     jfloat   f;
     jdouble  d;
     jint     i;
     jlong    l;
     jobject  h;
   } JavaCallValue;
  private:
   BasicType _type;
   JavaCallValue _value;
  public:
   JavaValue(BasicType t = T_ILLEGAL) { _type = t; }
   JavaValue(jfloat value) {
     _type    = T_FLOAT;
     _value.f = value;
   }
   JavaValue(jdouble value) {
     _type    = T_DOUBLE;
     _value.d = value;
   }
  jfloat get_jfloat() const { return _value.f; }
  jdouble get_jdouble() const { return _value.d; }
  jint get_jint() const { return _value.i; }
  jlong get_jlong() const { return _value.l; }
  jobject get_jobject() const { return _value.h; }
  JavaCallValue* get_value_addr() { return &_value; }
  BasicType get_type() const { return _type; }
  void set_jfloat(jfloat f) { _value.f = f;}
  void set_jdouble(jdouble d) { _value.d = d;}
  void set_jint(jint i) { _value.i = i;}
  void set_jlong(jlong l) { _value.l = l;}
  void set_jobject(jobject h) { _value.h = h;}
  void set_type(BasicType t) { _type = t; }
  jboolean get_jboolean() const { return (jboolean) (_value.i);}
  jbyte get_jbyte() const { return (jbyte) (_value.i);}
  jchar get_jchar() const { return (jchar) (_value.i);}
  jshort get_jshort() const { return (jshort) (_value.i);}
 };
 #define STACK_BIAS      0
 // V9 Sparc CPU's running in 64 Bit mode use a stack bias of 7ff
 // in order to extend the reach of the stack pointer.
 #if defined(SPARC) && defined(_LP64)
 #undef STACK_BIAS
 #define STACK_BIAS      0x7ff
 #endif
 // TosState describes the top-of-stack state before and after the execution of
 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
 // registers. The TosState corresponds to the 'machine represention' of this cached
 // value. There's 4 states corresponding to the JAVA types int, long, float & double
 // as well as a 5th state in case the top-of-stack value is actually on the top
 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
 // state when it comes to machine representation but is used separately for (oop)
 // type specific operations (e.g. verification code).
 enum TosState {         // describes the tos cache contents
   btos = 0,             // byte, bool tos cached
   ctos = 1,             // char tos cached
   stos = 2,             // short tos cached
   itos = 3,             // int tos cached
   ltos = 4,             // long tos cached
   ftos = 5,             // float tos cached
   dtos = 6,             // double tos cached
   atos = 7,             // object cached
   vtos = 8,             // tos not cached
   number_of_states,
   ilgl                  // illegal state: should not occur
 };
 inline TosState as_TosState(BasicType type) {
   switch (type) {
     case T_BYTE   : return btos;
     case T_BOOLEAN: return btos; // FIXME: Add ztos
     case T_CHAR   : return ctos;
     case T_SHORT  : return stos;
     case T_INT    : return itos;
     case T_LONG   : return ltos;
     case T_FLOAT  : return ftos;
     case T_DOUBLE : return dtos;
     case T_VOID   : return vtos;
     case T_ARRAY  : // fall through
     case T_OBJECT : return atos;
   }
   return ilgl;
 }
 inline BasicType as_BasicType(TosState state) {
   switch (state) {
     //case ztos: return T_BOOLEAN;//FIXME
     case btos : return T_BYTE;
     case ctos : return T_CHAR;
     case stos : return T_SHORT;
     case itos : return T_INT;
     case ltos : return T_LONG;
     case ftos : return T_FLOAT;
     case dtos : return T_DOUBLE;
     case atos : return T_OBJECT;
     case vtos : return T_VOID;
   }
   return T_ILLEGAL;
 }
 // Helper function to convert BasicType info into TosState
 // Note: Cannot define here as it uses global constant at the time being.
 TosState as_TosState(BasicType type);
 // JavaThreadState keeps track of which part of the code a thread is executing in. This
 // information is needed by the safepoint code.
 //
 // There are 4 essential states:
 //
 //  _thread_new         : Just started, but not executed init. code yet (most likely still in OS init code)
 //  _thread_in_native   : In native code. This is a safepoint region, since all oops will be in jobject handles
 //  _thread_in_vm       : Executing in the vm
 //  _thread_in_Java     : Executing either interpreted or compiled Java code (or could be in a stub)
 //
 // Each state has an associated xxxx_trans state, which is an intermediate state used when a thread is in
 // a transition from one state to another. These extra states makes it possible for the safepoint code to
 // handle certain thread_states without having to suspend the thread - making the safepoint code faster.
 //
 // Given a state, the xxx_trans state can always be found by adding 1.
 //
 enum JavaThreadState {
   _thread_uninitialized     =  0, // should never happen (missing initialization)
   _thread_new               =  2, // just starting up, i.e., in process of being initialized
   _thread_new_trans         =  3, // corresponding transition state (not used, included for completness)
   _thread_in_native         =  4, // running in native code
   _thread_in_native_trans   =  5, // corresponding transition state
   _thread_in_vm             =  6, // running in VM
   _thread_in_vm_trans       =  7, // corresponding transition state
   _thread_in_Java           =  8, // running in Java or in stub code
   _thread_in_Java_trans     =  9, // corresponding transition state (not used, included for completness)
   _thread_blocked           = 10, // blocked in vm
   _thread_blocked_trans     = 11, // corresponding transition state
   _thread_max_state         = 12  // maximum thread state+1 - used for statistics allocation
 };
 // Handy constants for deciding which compiler mode to use.
 enum MethodCompilation {
   InvocationEntryBci = -1,     // i.e., not a on-stack replacement compilation
   InvalidOSREntryBci = -2
 };
 // Enumeration to distinguish tiers of compilation
 enum CompLevel {
   CompLevel_any               = -1,
   CompLevel_all               = -1,
   CompLevel_none              = 0,         // Interpreter
   CompLevel_simple            = 1,         // C1
   CompLevel_limited_profile   = 2,         // C1, invocation & backedge counters
   CompLevel_full_profile      = 3,         // C1, invocation & backedge counters + mdo
   CompLevel_full_optimization = 4,         // C2 or Shark
 #if defined(COMPILER2) || defined(SHARK)
   CompLevel_highest_tier      = CompLevel_full_optimization,  // pure C2 and tiered
 #elif defined(COMPILER1)
   CompLevel_highest_tier      = CompLevel_simple,             // pure C1
 #else
   CompLevel_highest_tier      = CompLevel_none,
 #endif
 #if defined(TIERED)
   CompLevel_initial_compile   = CompLevel_full_profile        // tiered
 #elif defined(COMPILER1)
   CompLevel_initial_compile   = CompLevel_simple              // pure C1
 #elif defined(COMPILER2) || defined(SHARK)
   CompLevel_initial_compile   = CompLevel_full_optimization   // pure C2
 #else
   CompLevel_initial_compile   = CompLevel_none
 #endif
 };
 inline bool is_c1_compile(int comp_level) {
   return comp_level > CompLevel_none && comp_level < CompLevel_full_optimization;
 }
 inline bool is_c2_compile(int comp_level) {
   return comp_level == CompLevel_full_optimization;
 }
 inline bool is_highest_tier_compile(int comp_level) {
   return comp_level == CompLevel_highest_tier;
 }
 inline bool is_compile(int comp_level) {
   return is_c1_compile(comp_level) || is_c2_compile(comp_level);
 }
 //----------------------------------------------------------------------------------------------------
 // 'Forward' declarations of frequently used classes
 // (in order to reduce interface dependencies & reduce
 // number of unnecessary compilations after changes)
 class symbolTable;
 class ClassFileStream;
 class Event;
 class Thread;
 class  VMThread;
 class  JavaThread;
 class Threads;
 class VM_Operation;
 class VMOperationQueue;
 class CodeBlob;
 class  nmethod;
 class  OSRAdapter;
 class  I2CAdapter;
 class  C2IAdapter;
 class CompiledIC;
 class relocInfo;
 class ScopeDesc;
 class PcDesc;
 class Recompiler;
 class Recompilee;
 class RecompilationPolicy;
 class RFrame;
 class  CompiledRFrame;
 class  InterpretedRFrame;
 class frame;
 class vframe;
 class   javaVFrame;
 class     interpretedVFrame;
 class     compiledVFrame;
 class     deoptimizedVFrame;
 class   externalVFrame;
 class     entryVFrame;
 class RegisterMap;
 class Mutex;
 class Monitor;
 class BasicLock;
 class BasicObjectLock;
 class PeriodicTask;
 class JavaCallWrapper;
 class   oopDesc;
 class   metaDataOopDesc;
 class NativeCall;
 class zone;
 class StubQueue;
 class outputStream;
 class ResourceArea;
 class DebugInformationRecorder;
 class ScopeValue;
 class CompressedStream;
 class   DebugInfoReadStream;
 class   DebugInfoWriteStream;
 class LocationValue;
 class ConstantValue;
 class IllegalValue;
 class PrivilegedElement;
 class MonitorArray;
 class MonitorInfo;
 class OffsetClosure;
 class OopMapCache;
 class InterpreterOopMap;
 class OopMapCacheEntry;
 class OSThread;
 typedef int (*OSThreadStartFunc)(void*);
 class Space;
 class JavaValue;
 class methodHandle;
 class JavaCallArguments;
 // Basic support for errors (general debug facilities not defined at this point fo the include phase)
 extern void basic_fatal(const char* msg);
 //----------------------------------------------------------------------------------------------------
 // Special constants for debugging
 const jint     badInt           = -3;                       // generic "bad int" value
 const long     badAddressVal    = -2;                       // generic "bad address" value
 const long     badOopVal        = -1;                       // generic "bad oop" value
 const intptr_t badHeapOopVal    = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
 const int      badHandleValue   = 0xBC;                     // value used to zap vm handle area
 const int      badResourceValue = 0xAB;                     // value used to zap resource area
 const int      freeBlockPad     = 0xBA;                     // value used to pad freed blocks.
 const int      uninitBlockPad   = 0xF1;                     // value used to zap newly malloc'd blocks.
 const intptr_t badJNIHandleVal  = (intptr_t) CONST64(0xFEFEFEFEFEFEFEFE); // value used to zap jni handle area
 const juint    badHeapWordVal   = 0xBAADBABE;               // value used to zap heap after GC
 const juint    badMetaWordVal   = 0xBAADFADE;               // value used to zap metadata heap after GC
 const int      badCodeHeapNewVal= 0xCC;                     // value used to zap Code heap at allocation
 const int      badCodeHeapFreeVal = 0xDD;                   // value used to zap Code heap at deallocation
 // (These must be implemented as #defines because C++ compilers are
 // not obligated to inline non-integral constants!)
 #define       badAddress        ((address)::badAddressVal)
 #define       badOop            (cast_to_oop(::badOopVal))
 #define       badHeapWord       (::badHeapWordVal)
 #define       badJNIHandle      (cast_to_oop(::badJNIHandleVal))
 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
 #define TASKQUEUE_SIZE (NOT_LP64(1<<14) LP64_ONLY(1<<17))
 //----------------------------------------------------------------------------------------------------
 // Utility functions for bitfield manipulations
 const intptr_t AllBits    = ~0; // all bits set in a word
 const intptr_t NoBits     =  0; // no bits set in a word
 const jlong    NoLongBits =  0; // no bits set in a long
 const intptr_t OneBit     =  1; // only right_most bit set in a word
 // get a word with the n.th or the right-most or left-most n bits set
 // (note: #define used only so that they can be used in enum constant definitions)
 #define nth_bit(n)        (n >= BitsPerWord ? 0 : OneBit << (n))
 #define right_n_bits(n)   (nth_bit(n) - 1)
 #define left_n_bits(n)    (right_n_bits(n) << (n >= BitsPerWord ? 0 : (BitsPerWord - n)))
 // bit-operations using a mask m
 inline void   set_bits    (intptr_t& x, intptr_t m) { x |= m; }
 inline void clear_bits    (intptr_t& x, intptr_t m) { x &= ~m; }
 inline intptr_t mask_bits      (intptr_t  x, intptr_t m) { return x & m; }
 inline jlong    mask_long_bits (jlong     x, jlong    m) { return x & m; }
 inline bool mask_bits_are_true (intptr_t flags, intptr_t mask) { return (flags & mask) == mask; }
 // bit-operations using the n.th bit
 inline void    set_nth_bit(intptr_t& x, int n) { set_bits  (x, nth_bit(n)); }
 inline void  clear_nth_bit(intptr_t& x, int n) { clear_bits(x, nth_bit(n)); }
 inline bool is_set_nth_bit(intptr_t  x, int n) { return mask_bits (x, nth_bit(n)) != NoBits; }
 // returns the bitfield of x starting at start_bit_no with length field_length (no sign-extension!)
 inline intptr_t bitfield(intptr_t x, int start_bit_no, int field_length) {
   return mask_bits(x >> start_bit_no, right_n_bits(field_length));
 }
 //----------------------------------------------------------------------------------------------------
 // Utility functions for integers
 // Avoid use of global min/max macros which may cause unwanted double
 // evaluation of arguments.
 #ifdef max
 #undef max
 #endif
 #ifdef min
 #undef min
 #endif
 #define max(a,b) Do_not_use_max_use_MAX2_instead
 #define min(a,b) Do_not_use_min_use_MIN2_instead
 // It is necessary to use templates here. Having normal overloaded
 // functions does not work because it is necessary to provide both 32-
 // and 64-bit overloaded functions, which does not work, and having
 // explicitly-typed versions of these routines (i.e., MAX2I, MAX2L)
 // will be even more error-prone than macros.
 template<class T> inline T MAX2(T a, T b)           { return (a > b) ? a : b; }
 template<class T> inline T MIN2(T a, T b)           { return (a < b) ? a : b; }
 template<class T> inline T MAX3(T a, T b, T c)      { return MAX2(MAX2(a, b), c); }
 template<class T> inline T MIN3(T a, T b, T c)      { return MIN2(MIN2(a, b), c); }
 template<class T> inline T MAX4(T a, T b, T c, T d) { return MAX2(MAX3(a, b, c), d); }
 template<class T> inline T MIN4(T a, T b, T c, T d) { return MIN2(MIN3(a, b, c), d); }
 template<class T> inline T ABS(T x)                 { return (x > 0) ? x : -x; }
 // true if x is a power of 2, false otherwise
 inline bool is_power_of_2(intptr_t x) {
   return ((x != NoBits) && (mask_bits(x, x - 1) == NoBits));
 }
 // long version of is_power_of_2
 inline bool is_power_of_2_long(jlong x) {
   return ((x != NoLongBits) && (mask_long_bits(x, x - 1) == NoLongBits));
 }
 //* largest i such that 2^i <= x
 //  A negative value of 'x' will return '31'
 inline int log2_intptr(intptr_t x) {
   int i = -1;
   uintptr_t p =  1;
   while (p != 0 && p <= (uintptr_t)x) {
     // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
     i++; p *= 2;
   }
   // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
   // (if p = 0 then overflow occurred and i = 31)
   return i;
 }
 //* largest i such that 2^i <= x
 //  A negative value of 'x' will return '63'
 inline int log2_long(jlong x) {
   int i = -1;
   julong p =  1;
   while (p != 0 && p <= (julong)x) {
     // p = 2^(i+1) && p <= x (i.e., 2^(i+1) <= x)
     i++; p *= 2;
   }
   // p = 2^(i+1) && x < p (i.e., 2^i <= x < 2^(i+1))
   // (if p = 0 then overflow occurred and i = 63)
   return i;
 }
 //* the argument must be exactly a power of 2
 inline int exact_log2(intptr_t x) {
   #ifdef ASSERT
     if (!is_power_of_2(x)) basic_fatal("x must be a power of 2");
   #endif
   return log2_intptr(x);
 }
 //* the argument must be exactly a power of 2
 inline int exact_log2_long(jlong x) {
   #ifdef ASSERT
     if (!is_power_of_2_long(x)) basic_fatal("x must be a power of 2");
   #endif
   return log2_long(x);
 }
 // returns integer round-up to the nearest multiple of s (s must be a power of two)
 inline intptr_t round_to(intptr_t x, uintx s) {
   #ifdef ASSERT
     if (!is_power_of_2(s)) basic_fatal("s must be a power of 2");
   #endif
   const uintx m = s - 1;
   return mask_bits(x + m, ~m);
 }
 // returns integer round-down to the nearest multiple of s (s must be a power of two)
 inline intptr_t round_down(intptr_t x, uintx s) {
   #ifdef ASSERT
     if (!is_power_of_2(s)) basic_fatal("s must be a power of 2");
   #endif
   const uintx m = s - 1;
   return mask_bits(x, ~m);
 }
 inline bool is_odd (intx x) { return x & 1;      }
 inline bool is_even(intx x) { return !is_odd(x); }
 // "to" should be greater than "from."
 inline intx byte_size(void* from, void* to) {
   return (address)to - (address)from;
 }
 //----------------------------------------------------------------------------------------------------
 // Avoid non-portable casts with these routines (DEPRECATED)
 // NOTE: USE Bytes class INSTEAD WHERE POSSIBLE
 //       Bytes is optimized machine-specifically and may be much faster then the portable routines below.
 // Given sequence of four bytes, build into a 32-bit word
 // following the conventions used in class files.
 // On the 386, this could be realized with a simple address cast.
 //
 // This routine takes eight bytes:
 inline u8 build_u8_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
   return  (( u8(c1) << 56 )  &  ( u8(0xff) << 56 ))
        |  (( u8(c2) << 48 )  &  ( u8(0xff) << 48 ))
        |  (( u8(c3) << 40 )  &  ( u8(0xff) << 40 ))
        |  (( u8(c4) << 32 )  &  ( u8(0xff) << 32 ))
        |  (( u8(c5) << 24 )  &  ( u8(0xff) << 24 ))
        |  (( u8(c6) << 16 )  &  ( u8(0xff) << 16 ))
        |  (( u8(c7) <<  8 )  &  ( u8(0xff) <<  8 ))
        |  (( u8(c8) <<  0 )  &  ( u8(0xff) <<  0 ));
 }
 // This routine takes four bytes:
 inline u4 build_u4_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
   return  (( u4(c1) << 24 )  &  0xff000000)
        |  (( u4(c2) << 16 )  &  0x00ff0000)
        |  (( u4(c3) <<  8 )  &  0x0000ff00)
        |  (( u4(c4) <<  0 )  &  0x000000ff);
 }
 // And this one works if the four bytes are contiguous in memory:
 inline u4 build_u4_from( u1* p ) {
   return  build_u4_from( p[0], p[1], p[2], p[3] );
 }
 // Ditto for two-byte ints:
 inline u2 build_u2_from( u1 c1, u1 c2 ) {
   return  u2((( u2(c1) <<  8 )  &  0xff00)
           |  (( u2(c2) <<  0 )  &  0x00ff));
 }
 // And this one works if the two bytes are contiguous in memory:
 inline u2 build_u2_from( u1* p ) {
   return  build_u2_from( p[0], p[1] );
 }
 // Ditto for floats:
 inline jfloat build_float_from( u1 c1, u1 c2, u1 c3, u1 c4 ) {
   u4 u = build_u4_from( c1, c2, c3, c4 );
   return  *(jfloat*)&u;
 }
 inline jfloat build_float_from( u1* p ) {
   u4 u = build_u4_from( p );
   return  *(jfloat*)&u;
 }
 // now (64-bit) longs
 inline jlong build_long_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
   return  (( jlong(c1) << 56 )  &  ( jlong(0xff) << 56 ))
        |  (( jlong(c2) << 48 )  &  ( jlong(0xff) << 48 ))
        |  (( jlong(c3) << 40 )  &  ( jlong(0xff) << 40 ))
        |  (( jlong(c4) << 32 )  &  ( jlong(0xff) << 32 ))
        |  (( jlong(c5) << 24 )  &  ( jlong(0xff) << 24 ))
        |  (( jlong(c6) << 16 )  &  ( jlong(0xff) << 16 ))
        |  (( jlong(c7) <<  8 )  &  ( jlong(0xff) <<  8 ))
        |  (( jlong(c8) <<  0 )  &  ( jlong(0xff) <<  0 ));
 }
 inline jlong build_long_from( u1* p ) {
   return  build_long_from( p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7] );
 }
 // Doubles, too!
 inline jdouble build_double_from( u1 c1, u1 c2, u1 c3, u1 c4, u1 c5, u1 c6, u1 c7, u1 c8 ) {
   jlong u = build_long_from( c1, c2, c3, c4, c5, c6, c7, c8 );
   return  *(jdouble*)&u;
 }
 inline jdouble build_double_from( u1* p ) {
   jlong u = build_long_from( p );
   return  *(jdouble*)&u;
 }
 // Portable routines to go the other way:
 inline void explode_short_to( u2 x, u1& c1, u1& c2 ) {
   c1 = u1(x >> 8);
   c2 = u1(x);
 }
 inline void explode_short_to( u2 x, u1* p ) {
   explode_short_to( x, p[0], p[1]);
 }
 inline void explode_int_to( u4 x, u1& c1, u1& c2, u1& c3, u1& c4 ) {
   c1 = u1(x >> 24);
   c2 = u1(x >> 16);
   c3 = u1(x >>  8);
   c4 = u1(x);
 }
 inline void explode_int_to( u4 x, u1* p ) {
   explode_int_to( x, p[0], p[1], p[2], p[3]);
 }
 // Pack and extract shorts to/from ints:
 inline int extract_low_short_from_int(jint x) {
   return x & 0xffff;
 }
 inline int extract_high_short_from_int(jint x) {
   return (x >> 16) & 0xffff;
 }
 inline int build_int_from_shorts( jushort low, jushort high ) {
   return ((int)((unsigned int)high << 16) | (unsigned int)low);
 }
 // Printf-style formatters for fixed- and variable-width types as pointers and
 // integers.  These are derived from the definitions in inttypes.h.  If the platform
 // doesn't provide appropriate definitions, they should be provided in
 // the compiler-specific definitions file (e.g., globalDefinitions_gcc.hpp)
 #define BOOL_TO_STR(_b_) ((_b_) ? "true" : "false")
 // Format 32-bit quantities.
 #define INT32_FORMAT           "%" PRId32
 #define UINT32_FORMAT          "%" PRIu32
 #define INT32_FORMAT_W(width)  "%" #width PRId32
 #define UINT32_FORMAT_W(width) "%" #width PRIu32
 #define PTR32_FORMAT           "0x%08" PRIx32
 // Format 64-bit quantities.
 #define INT64_FORMAT           "%" PRId64
 #define UINT64_FORMAT          "%" PRIu64
 #define INT64_FORMAT_W(width)  "%" #width PRId64
 #define UINT64_FORMAT_W(width) "%" #width PRIu64
 #define PTR64_FORMAT           "0x%016" PRIx64
 // Format jlong, if necessary
 #ifndef JLONG_FORMAT
 #define JLONG_FORMAT           INT64_FORMAT
 #endif
 #ifndef JULONG_FORMAT
 #define JULONG_FORMAT          UINT64_FORMAT
 #endif
 // Format pointers which change size between 32- and 64-bit.
 #ifdef  _LP64
 #define INTPTR_FORMAT "0x%016" PRIxPTR
 #define PTR_FORMAT    "0x%016" PRIxPTR
 #else   // !_LP64
 #define INTPTR_FORMAT "0x%08"  PRIxPTR
 #define PTR_FORMAT    "0x%08"  PRIxPTR
 #endif  // _LP64
 #define SSIZE_FORMAT          "%" PRIdPTR
 #define SIZE_FORMAT           "%" PRIuPTR
 #define SSIZE_FORMAT_W(width) "%" #width PRIdPTR
 #define SIZE_FORMAT_W(width)  "%" #width PRIuPTR
 #define INTX_FORMAT           "%" PRIdPTR
 #define UINTX_FORMAT          "%" PRIuPTR
 #define INTX_FORMAT_W(width)  "%" #width PRIdPTR
 #define UINTX_FORMAT_W(width) "%" #width PRIuPTR
 // Enable zap-a-lot if in debug version.
 # ifdef ASSERT
 # ifdef COMPILER2
 #   define ENABLE_ZAP_DEAD_LOCALS
 #endif /* COMPILER2 */
 # endif /* ASSERT */
 #define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
 // Dereference vptr
 // All C++ compilers that we know of have the vtbl pointer in the first
 // word.  If there are exceptions, this function needs to be made compiler
 // specific.
 static inline void* dereference_vptr(void* addr) {
   return *(void**)addr;
 }
 #ifndef PRODUCT
 // For unit testing only
 class GlobalDefinitions {
 public:
   static void test_globals();
 };
 #endif // PRODUCT
 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/globalDefinitions.hpp@c90e76575b03 (annotated)

src/share/vm/utilities/globalDefinitions.hpp