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view src/share/vm/utilities/globalDefinitions_gcc.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
---|---|
date | Fri, 10 Oct 2014 15:51:58 +0200 |
parents | b6a8cc1e0d92 |
children |
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/* * Copyright (c) 1998, 2014, 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_GCC_HPP #define SHARE_VM_UTILITIES_GLOBALDEFINITIONS_GCC_HPP #include "prims/jni.h" // 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 #if defined(LINUX) || defined(_ALLBSD_SOURCE) #ifndef __STDC_LIMIT_MACROS #define __STDC_LIMIT_MACROS #endif // __STDC_LIMIT_MACROS #include <inttypes.h> #include <signal.h> #ifndef __OpenBSD__ #include <ucontext.h> #endif #ifdef __APPLE__ #include <AvailabilityMacros.h> #include <mach/mach.h> #endif #include <sys/time.h> #endif // LINUX || _ALLBSD_SOURCE // 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 __GNUC__ #ifdef _LP64 #define NULL_WORD 0L #else // Cast 0 to intptr_t rather than int32_t since they are not the same type // on platforms such as Mac OS X. #define NULL_WORD ((intptr_t)0) #endif #else #define NULL_WORD NULL #endif #if !defined(LINUX) && !defined(_ALLBSD_SOURCE) // 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 && !_ALLBSD_SOURCE // Additional Java basic types typedef uint8_t jubyte; typedef uint16_t jushort; typedef uint32_t juint; typedef uint64_t julong; //---------------------------------------------------------------------------------------------------- // 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(); #ifdef ARM #ifdef SOLARIS #define BREAKPOINT __asm__ volatile (".long 0xe1200070") #else #define BREAKPOINT __asm__ volatile (".long 0xe7f001f0") #endif #else extern "C" void breakpoint(); #define BREAKPOINT ::breakpoint() #endif // 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 defined(__APPLE__) inline int g_isnan(double f) { return isnan(f); } #elif defined(LINUX) || defined(_ALLBSD_SOURCE) 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 // GCC 4.3 does not allow 0.0/0.0 to produce a NAN value #if (__GNUC__ == 4) && (__GNUC_MINOR__ > 2) #define CAN_USE_NAN_DEFINE 1 #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 #ifndef ATTRIBUTE_PRINTF // Diagnostic pragmas like the ones defined below in PRAGMA_FORMAT_NONLITERAL_IGNORED // were only introduced in GCC 4.2. Because we have no other possibility to ignore // these warnings for older versions of GCC, we simply don't decorate our printf-style // functions with __attribute__(format) in that case. #if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2)) || (__GNUC__ > 4) #define ATTRIBUTE_PRINTF(fmt,vargs) __attribute__((format(printf, fmt, vargs))) #else #define ATTRIBUTE_PRINTF(fmt,vargs) #endif #endif #define PRAGMA_FORMAT_NONLITERAL_IGNORED _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"") \ _Pragma("GCC diagnostic ignored \"-Wformat-security\"") #define PRAGMA_FORMAT_IGNORED _Pragma("GCC diagnostic ignored \"-Wformat\"") #if defined(__clang_major__) && \ (__clang_major__ >= 4 || \ (__clang_major__ >= 3 && __clang_minor__ >= 1)) || \ ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 6)) || (__GNUC__ > 4) // Tested to work with clang version 3.1 and better. #define PRAGMA_DIAG_PUSH _Pragma("GCC diagnostic push") #define PRAGMA_DIAG_POP _Pragma("GCC diagnostic pop") #define PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL #define PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL PRAGMA_FORMAT_NONLITERAL_IGNORED // Hack to deal with gcc yammering about non-security format stuff #else // Old versions of gcc don't do push/pop, also do not cope with this pragma within a function // One method does so much varied printing that it is decorated with both internal and external // versions of the macro-pragma to obtain better checking with newer compilers. #define PRAGMA_DIAG_PUSH #define PRAGMA_DIAG_POP #define PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL PRAGMA_FORMAT_NONLITERAL_IGNORED #define PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL #endif #ifndef __clang_major__ #define PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC _Pragma("GCC diagnostic ignored \"-Wformat\"") _Pragma("GCC diagnostic error \"-Wformat-nonliteral\"") _Pragma("GCC diagnostic error \"-Wformat-security\"") #endif #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) #if defined(_LP64) && defined(__APPLE__) #define JLONG_FORMAT "%ld" #endif // _LP64 && __APPLE__ #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_GCC_HPP