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src/os/aix/vm/porting_aix.hpp

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rev 9211 : 8140645: Recent Developments for AIX
Summary: Port recent developments from SAP for AIX to the OpenJDK


  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



  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 // Header file to contain porting-relevant code which does not have a
  31 // home anywhere else and which can not go into os_<platform>.h because
  32 // that header is included inside the os class definition, hence all
  33 // its content is part of the os class.
  34 
  35 // Aix' own version of dladdr().
  36 // This function tries to mimick dladdr(3) on Linux
  37 // (see http://linux.die.net/man/3/dladdr)
  38 // dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
  39 //
  40 // Differences between AIX dladdr and Linux dladdr:
  41 //
  42 // 1) Dl_info.dli_fbase: can never work, is disabled.
  43 //   A loaded image on AIX is divided in multiple segments, at least two
  44 //   (text and data) but potentially also far more. This is because the loader may
  45 //   load each member into an own segment, as for instance happens with the libC.a
  46 // 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
  47 //   zero-length string is returned ("").
  48 // 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
  49 //   not the function descriptor.
  50 
  51 typedef struct {
  52   const char *dli_fname; // file path of loaded library
  53   // void *dli_fbase;
  54   const char *dli_sname; // symbol name; "" if not known
  55   void *dli_saddr;       // address of *entry* of function; not function descriptor;
  56 } Dl_info;
  57 
  58 // Note: we export this to use it inside J2se too
  59 #ifdef __cplusplus
  60 extern "C"
  61 #endif
  62 int dladdr(void *addr, Dl_info *info);
  63 






  64 typedef unsigned int* codeptr_t;
  65 
  66 struct tbtable;
  67 
  68 // helper function - given a program counter, tries to locate the traceback table and
  69 // returns info from it (like, most importantly, function name, displacement of the
  70 // pc inside the function, and the traceback table itself.
  71 #ifdef __cplusplus
  72 extern "C"
  73 #endif
  74 int getFuncName(
  75       codeptr_t pc,                    // [in] program counter
  76       char* p_name, size_t namelen,    // [out] optional: user provided buffer for the function name
  77       int* p_displacement,             // [out] optional: displacement
  78       const struct tbtable** p_tb,     // [out] optional: ptr to traceback table to get further information
  79       char* p_errmsg, size_t errmsglen, // [out] optional: user provided buffer for error messages
  80       bool demangle                    // [in] whether to demangle the name
  81     );
  82 

























































  83 #endif // OS_AIX_VM_PORTING_AIX_HPP
  84 
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