rev 9211 : 8140645: Recent Developments for AIX Summary: Port recent developments from SAP for AIX to the OpenJDK
1 /* 2 * Copyright 2012, 2015 SAP AG. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef OS_AIX_VM_PORTING_AIX_HPP 26 #define OS_AIX_VM_PORTING_AIX_HPP 27 28 #include <stddef.h> 29 30 // PPC port only: 31 #define assert0(b) assert( (b), "" ) 32 #define guarantee0(b) assert( (b), "" ) 33 template <class T1, class T2> bool is_aligned_to(T1 what, T2 alignment) { 34 return ( ((uintx)(what)) & (((uintx)(alignment)) - 1) ) == 0 ? true : false; 35 } 36 37 // Header file to contain porting-relevant code which does not have a 38 // home anywhere else and which can not go into os_<platform>.h because 39 // that header is included inside the os class definition, hence all 40 // its content is part of the os class. 41 42 // Aix' own version of dladdr(). 43 // This function tries to mimick dladdr(3) on Linux 44 // (see http://linux.die.net/man/3/dladdr) 45 // dladdr(3) is not POSIX but a GNU extension, and is not available on AIX. 46 // 47 // Differences between AIX dladdr and Linux dladdr: 48 // 49 // 1) Dl_info.dli_fbase: can never work, is disabled. 50 // A loaded image on AIX is divided in multiple segments, at least two 51 // (text and data) but potentially also far more. This is because the loader may 52 // load each member into an own segment, as for instance happens with the libC.a 53 // 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a 54 // zero-length string is returned (""). 55 // 3) Dl_info.dli_saddr: For code, this will return the entry point of the function, 56 // not the function descriptor. 57 58 typedef struct { 59 const char *dli_fname; // file path of loaded library 60 // void *dli_fbase; 61 const char *dli_sname; // symbol name; "" if not known 62 void *dli_saddr; // address of *entry* of function; not function descriptor; 63 } Dl_info; 64 65 // Note: we export this to use it inside J2se too 66 #ifdef __cplusplus 67 extern "C" 68 #endif 69 int dladdr(void *addr, Dl_info *info); 70 71 72 // The semantics in this file are thus that codeptr_t is a *real code ptr*. 73 // This means that any function taking codeptr_t as arguments will assume 74 // a real codeptr and won't handle function descriptors (eg getFuncName), 75 // whereas functions taking address as args will deal with function 76 // descriptors (eg os::dll_address_to_library_name). 77 typedef unsigned int* codeptr_t; 78 79 // helper function - given a program counter, tries to locate the traceback table and 80 // returns info from it (like, most importantly, function name, displacement of the 81 // pc inside the function, and the traceback table itself. 82 #ifdef __cplusplus 83 extern "C" 84 #endif 85 int getFuncName( 86 codeptr_t pc, // [in] program counter 87 char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name 88 int* p_displacement, // [out] optional: displacement 89 const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information 90 char* p_errmsg, size_t errmsglen,// [out] optional: user provided buffer for error messages 91 bool demangle = true // [in] whether to demangle the name 92 ); 93 94 // ------------------------------------------------------------------------- 95 96 // A simple critical section which shall be based upon OS critical 97 // sections (CRITICAL_SECTION resp. Posix Mutex) and nothing else. 98 99 #include <pthread.h> 100 101 namespace MiscUtils { 102 typedef pthread_mutex_t critsect_t; 103 104 inline void init_critsect(MiscUtils::critsect_t* cs) { 105 pthread_mutex_init(cs, NULL); 106 } 107 inline void free_critsect(MiscUtils::critsect_t* cs) { 108 pthread_mutex_destroy(cs); 109 } 110 inline void enter_critsect(MiscUtils::critsect_t* cs) { 111 pthread_mutex_lock(cs); 112 } 113 inline void leave_critsect(MiscUtils::critsect_t* cs) { 114 pthread_mutex_unlock(cs); 115 } 116 117 // Need to wrap this in an object because we need to dynamically initialize 118 // critical section (because of windows, where there is no way to initialize 119 // a CRITICAL_SECTION statically. On Unix, we could use 120 // PTHREAD_MUTEX_INITIALIZER) 121 122 // Note: The critical section does NOT get cleaned up in the destructor. That is 123 // by design: the CritSect class is only ever used as global objects whose 124 // lifetime spans the whole VM life; in that context we don't want the lock to 125 // be cleaned up when global C++ objects are destroyed, but to continue to work 126 // correctly right to the very end of the process life. 127 class CritSect { 128 critsect_t _cs; 129 public: 130 CritSect() { init_critsect(&_cs); } 131 //~CritSect() { free_critsect(&_cs); } 132 void enter() { enter_critsect(&_cs); } 133 void leave() { leave_critsect(&_cs); } 134 }; 135 136 class AutoCritSect { 137 CritSect* const _pcsobj; 138 public: 139 AutoCritSect(CritSect* pcsobj) 140 : _pcsobj(pcsobj) 141 { 142 _pcsobj->enter(); 143 } 144 ~AutoCritSect() { 145 _pcsobj->leave(); 146 } 147 }; 148 149 } 150 151 #endif // OS_AIX_VM_PORTING_AIX_HPP --- EOF ---