49 return true;
50 }
51
52 // At this point, we don't have a last_Java_frame, so
53 // we try to glean some information out of the ucontext
54 // if we were running Java code when SIGPROF came in.
55 if (isInJava) {
56 ucontext_t* uc = (ucontext_t*) ucontext;
57
58 intptr_t* ret_fp;
59 intptr_t* ret_sp;
60 ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,
61 &ret_sp, &ret_fp);
62 if (addr.pc() == NULL || ret_sp == NULL ) {
63 // ucontext wasn't useful
64 return false;
65 }
66
67 frame ret_frame(ret_sp, ret_fp, addr.pc());
68 if (!ret_frame.safe_for_sender(jt)) {
69 #ifdef COMPILER2
70 // C2 uses ebp as a general register see if NULL fp helps
71 frame ret_frame2(ret_sp, NULL, addr.pc());
72 if (!ret_frame2.safe_for_sender(jt)) {
73 // nothing else to try if the frame isn't good
74 return false;
75 }
76 ret_frame = ret_frame2;
77 #else
78 // nothing else to try if the frame isn't good
79 return false;
80 #endif /* COMPILER2 */
81 }
82 *fr_addr = ret_frame;
83 return true;
84 }
85
86 // nothing else to try
87 return false;
88 }
89
90 void JavaThread::cache_global_variables() { }
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49 return true;
50 }
51
52 // At this point, we don't have a last_Java_frame, so
53 // we try to glean some information out of the ucontext
54 // if we were running Java code when SIGPROF came in.
55 if (isInJava) {
56 ucontext_t* uc = (ucontext_t*) ucontext;
57
58 intptr_t* ret_fp;
59 intptr_t* ret_sp;
60 ExtendedPC addr = os::Bsd::fetch_frame_from_ucontext(this, uc,
61 &ret_sp, &ret_fp);
62 if (addr.pc() == NULL || ret_sp == NULL ) {
63 // ucontext wasn't useful
64 return false;
65 }
66
67 frame ret_frame(ret_sp, ret_fp, addr.pc());
68 if (!ret_frame.safe_for_sender(jt)) {
69 #if defined(COMPILER2) || INCLUDE_JVMCI
70 // C2 and JVMCI use ebp as a general register see if NULL fp helps
71 frame ret_frame2(ret_sp, NULL, addr.pc());
72 if (!ret_frame2.safe_for_sender(jt)) {
73 // nothing else to try if the frame isn't good
74 return false;
75 }
76 ret_frame = ret_frame2;
77 #else
78 // nothing else to try if the frame isn't good
79 return false;
80 #endif /* COMPILER2 || INCLUDE_JVMCI */
81 }
82 *fr_addr = ret_frame;
83 return true;
84 }
85
86 // nothing else to try
87 return false;
88 }
89
90 void JavaThread::cache_global_variables() { }
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