50 return true;
51 }
52
53 // At this point, we don't have a last_Java_frame, so
54 // we try to glean some information out of the ucontext
55 // if we were running Java code when SIGPROF came in.
56 if (isInJava) {
57 ucontext_t* uc = (ucontext_t*) ucontext;
58
59 intptr_t* ret_fp;
60 intptr_t* ret_sp;
61 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
62 &ret_sp, &ret_fp);
63 if (addr.pc() == NULL || ret_sp == NULL ) {
64 // ucontext wasn't useful
65 return false;
66 }
67
68 frame ret_frame(ret_sp, ret_fp, addr.pc());
69 if (!ret_frame.safe_for_sender(jt)) {
70 #ifdef COMPILER2
71 // C2 uses ebp as a general register see if NULL fp helps
72 frame ret_frame2(ret_sp, NULL, addr.pc());
73 if (!ret_frame2.safe_for_sender(jt)) {
74 // nothing else to try if the frame isn't good
75 return false;
76 }
77 ret_frame = ret_frame2;
78 #else
79 // nothing else to try if the frame isn't good
80 return false;
81 #endif /* COMPILER2 */
82 }
83 *fr_addr = ret_frame;
84 return true;
85 }
86
87 // nothing else to try
88 return false;
89 }
90
91 void JavaThread::cache_global_variables() { }
92
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50 return true;
51 }
52
53 // At this point, we don't have a last_Java_frame, so
54 // we try to glean some information out of the ucontext
55 // if we were running Java code when SIGPROF came in.
56 if (isInJava) {
57 ucontext_t* uc = (ucontext_t*) ucontext;
58
59 intptr_t* ret_fp;
60 intptr_t* ret_sp;
61 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
62 &ret_sp, &ret_fp);
63 if (addr.pc() == NULL || ret_sp == NULL ) {
64 // ucontext wasn't useful
65 return false;
66 }
67
68 frame ret_frame(ret_sp, ret_fp, addr.pc());
69 if (!ret_frame.safe_for_sender(jt)) {
70 #if defined(COMPILER2) || INCLUDE_JVMCI
71 // C2 and JVMCI use ebp as a general register see if NULL fp helps
72 frame ret_frame2(ret_sp, NULL, addr.pc());
73 if (!ret_frame2.safe_for_sender(jt)) {
74 // nothing else to try if the frame isn't good
75 return false;
76 }
77 ret_frame = ret_frame2;
78 #else
79 // nothing else to try if the frame isn't good
80 return false;
81 #endif /* COMPILER2 || INCLUDE_JVMCI */
82 }
83 *fr_addr = ret_frame;
84 return true;
85 }
86
87 // nothing else to try
88 return false;
89 }
90
91 void JavaThread::cache_global_variables() { }
92
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