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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