jdk8-mips64-public/hotspot: src/share/vm/utilities/globalDefinitions

src/share/vm/utilities/globalDefinitions_gcc.hpp@c96030fff130 (annotated)

src/share/vm/utilities/globalDefinitions_gcc.hpp

Thu, 20 Nov 2008 16:56:09 -0800

author: ysr
date: Thu, 20 Nov 2008 16:56:09 -0800
changeset 888: c96030fff130
parent 435: a61af66fc99e
child 947: db4caa99ef11
permissions: -rw-r--r--

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

 /*
  * Copyright 1998-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 // This file holds compiler-dependent includes,
 // globally used constants & types, class (forward)
 // declarations and a few frequently used utility functions.
 #include <ctype.h>
 #include <string.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <wchar.h>
 #ifdef SOLARIS
 #include <ieeefp.h>
 #endif // SOLARIS
 #include <math.h>
 #ifndef FP_PZERO
 // Linux doesn't have positive/negative zero
 #define FP_PZERO FP_ZERO
 #endif
 #if (!defined fpclass) && ((!defined SPARC) || (!defined SOLARIS))
 #define fpclass fpclassify
 #endif
 #include <time.h>
 #include <fcntl.h>
 #include <dlfcn.h>
 #include <pthread.h>
 #ifdef SOLARIS
 #include <thread.h>
 #endif // SOLARIS
 #include <limits.h>
 #include <errno.h>
 #ifdef SOLARIS
 #include <sys/trap.h>
 #include <sys/regset.h>
 #include <sys/procset.h>
 #include <ucontext.h>
 #include <setjmp.h>
 #endif // SOLARIS
 # ifdef SOLARIS_MUTATOR_LIBTHREAD
 # include <sys/procfs.h>
 # endif
 #ifdef LINUX
 #include <inttypes.h>
 #include <signal.h>
 #include <ucontext.h>
 #include <sys/time.h>
 #endif // LINUX
 // 4810578: varargs unsafe on 32-bit integer/64-bit pointer architectures
 // When __cplusplus is defined, NULL is defined as 0 (32-bit constant) in
 // system header files.  On 32-bit architectures, there is no problem.
 // On 64-bit architectures, defining NULL as a 32-bit constant can cause
 // problems with varargs functions: C++ integral promotion rules say for
 // varargs, we pass the argument 0 as an int.  So, if NULL was passed to a
 // varargs function it will remain 32-bits.  Depending on the calling
 // convention of the machine, if the argument is passed on the stack then
 // only 32-bits of the "NULL" pointer may be initialized to zero.  The
 // other 32-bits will be garbage.  If the varargs function is expecting a
 // pointer when it extracts the argument, then we have a problem.
 //
 // Solution: For 64-bit architectures, redefine NULL as 64-bit constant 0.
 //
 // Note: this fix doesn't work well on Linux because NULL will be overwritten
 // whenever a system header file is included. Linux handles NULL correctly
 // through a special type '__null'.
 #ifdef SOLARIS
   #ifdef _LP64
     #undef NULL
     #define NULL 0L
   #else
     #ifndef NULL
       #define NULL 0
     #endif
   #endif
 #endif
 // NULL vs NULL_WORD:
 // On Linux NULL is defined as a special type '__null'. Assigning __null to
 // integer variable will cause gcc warning. Use NULL_WORD in places where a
 // pointer is stored as integer value.  On some platforms, sizeof(intptr_t) >
 // sizeof(void*), so here we want something which is integer type, but has the
 // same size as a pointer.
 #ifdef LINUX
   #ifdef _LP64
     #define NULL_WORD  0L
   #else
     #define NULL_WORD  0
   #endif
 #else
   #define NULL_WORD  NULL
 #endif
 #ifndef LINUX
 // Compiler-specific primitive types
 typedef unsigned short     uint16_t;
 #ifndef _UINT32_T
 #define _UINT32_T
 typedef unsigned int       uint32_t;
 #endif // _UINT32_T
 #if !defined(_SYS_INT_TYPES_H)
 #ifndef _UINT64_T
 #define _UINT64_T
 typedef unsigned long long uint64_t;
 #endif // _UINT64_T
 // %%%% how to access definition of intptr_t portably in 5.5 onward?
 typedef int                     intptr_t;
 typedef unsigned int            uintptr_t;
 // If this gets an error, figure out a symbol XXX that implies the
 // prior definition of intptr_t, and add "&& !defined(XXX)" above.
 #endif // _SYS_INT_TYPES_H
 #endif // !LINUX
 // Additional Java basic types
 typedef uint8_t  jubyte;
 typedef uint16_t jushort;
 typedef uint32_t juint;
 typedef uint64_t julong;
 //----------------------------------------------------------------------------------------------------
 // Special (possibly not-portable) casts
 // Cast floats into same-size integers and vice-versa w/o changing bit-pattern
 // %%%%%% These seem like standard C++ to me--how about factoring them out? - Ungar
 inline jint    jint_cast   (jfloat  x)           { return *(jint*   )&x; }
 inline jlong   jlong_cast  (jdouble x)           { return *(jlong*  )&x; }
 inline jfloat  jfloat_cast (jint    x)           { return *(jfloat* )&x; }
 inline jdouble jdouble_cast(jlong   x)           { return *(jdouble*)&x; }
 //----------------------------------------------------------------------------------------------------
 // Constant for jlong (specifying an long long canstant is C++ compiler specific)
 // Build a 64bit integer constant
 #define CONST64(x)  (x ## LL)
 #define UCONST64(x) (x ## ULL)
 const jlong min_jlong = CONST64(0x8000000000000000);
 const jlong max_jlong = CONST64(0x7fffffffffffffff);
 #ifdef SOLARIS
 //----------------------------------------------------------------------------------------------------
 // ANSI C++ fixes
 // NOTE:In the ANSI committee's continuing attempt to make each version
 // of C++ incompatible with the previous version, you can no longer cast
 // pointers to functions without specifying linkage unless you want to get
 // warnings.
 //
 // This also means that pointers to functions can no longer be "hidden"
 // in opaque types like void * because at the invokation point warnings
 // will be generated. While this makes perfect sense from a type safety
 // point of view it causes a lot of warnings on old code using C header
 // files. Here are some typedefs to make the job of silencing warnings
 // a bit easier.
 //
 // The final kick in the teeth is that you can only have extern "C" linkage
 // specified at file scope. So these typedefs are here rather than in the
 // .hpp for the class (os:Solaris usually) that needs them.
 extern "C" {
    typedef int (*int_fnP_thread_t_iP_uP_stack_tP_gregset_t)(thread_t, int*, unsigned *, stack_t*, gregset_t);
    typedef int (*int_fnP_thread_t_i_gregset_t)(thread_t, int, gregset_t);
    typedef int (*int_fnP_thread_t_i)(thread_t, int);
    typedef int (*int_fnP_thread_t)(thread_t);
    typedef int (*int_fnP_cond_tP_mutex_tP_timestruc_tP)(cond_t *cv, mutex_t *mx, timestruc_t *abst);
    typedef int (*int_fnP_cond_tP_mutex_tP)(cond_t *cv, mutex_t *mx);
    // typedef for missing API in libc
    typedef int (*int_fnP_mutex_tP_i_vP)(mutex_t *, int, void *);
    typedef int (*int_fnP_mutex_tP)(mutex_t *);
    typedef int (*int_fnP_cond_tP_i_vP)(cond_t *cv, int scope, void *arg);
    typedef int (*int_fnP_cond_tP)(cond_t *cv);
 };
 #endif // SOLARIS
 //----------------------------------------------------------------------------------------------------
 // Debugging
 #define DEBUG_EXCEPTION ::abort();
 extern "C" void breakpoint();
 #define BREAKPOINT ::breakpoint()
 // checking for nanness
 #ifdef SOLARIS
 #ifdef SPARC
 inline int g_isnan(float  f) { return isnanf(f); }
 #else
 // isnanf() broken on Intel Solaris use isnand()
 inline int g_isnan(float  f) { return isnand(f); }
 #endif
 inline int g_isnan(double f) { return isnand(f); }
 #elif LINUX
 inline int g_isnan(float  f) { return isnanf(f); }
 inline int g_isnan(double f) { return isnan(f); }
 #else
 #error "missing platform-specific definition here"
 #endif
 // Checking for finiteness
 inline int g_isfinite(jfloat  f)                 { return finite(f); }
 inline int g_isfinite(jdouble f)                 { return finite(f); }
 // Wide characters
 inline int wcslen(const jchar* x) { return wcslen((const wchar_t*)x); }
 // Portability macros
 #define PRAGMA_INTERFACE             #pragma interface
 #define PRAGMA_IMPLEMENTATION        #pragma implementation
 #define VALUE_OBJ_CLASS_SPEC
 #if (__GNUC__ == 2) && (__GNUC_MINOR__ < 95)
 #define TEMPLATE_TABLE_BUG
 #endif
 #if (__GNUC__ == 2) && (__GNUC_MINOR__ >= 96)
 #define CONST_SDM_BUG
 #endif
 // Formatting.
 #ifdef _LP64
 #define FORMAT64_MODIFIER "l"
 #else // !_LP64
 #define FORMAT64_MODIFIER "ll"
 #endif // _LP64
 // HACK: gcc warns about applying offsetof() to non-POD object or calculating
 //       offset directly when base address is NULL. Use 16 to get around the
 //       warning. gcc-3.4 has an option -Wno-invalid-offsetof to suppress
 //       this warning.
 #define offset_of(klass,field) (size_t)((intx)&(((klass*)16)->field) - 16)
 #ifdef offsetof
 # undef offsetof
 #endif
 #define offsetof(klass,field) offset_of(klass,field)

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/globalDefinitions_gcc.hpp@c96030fff130 (annotated)

src/share/vm/utilities/globalDefinitions_gcc.hpp