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::Bsd::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 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
69 // In the middle of a trampoline call. Bail out for safety.
70 // This happens rarely so shouldn't affect profiling.
71 return false;
72 }
73
74 frame ret_frame(ret_sp, ret_fp, addr.pc());
75 if (!ret_frame.safe_for_sender(jt)) {
76 #if defined(COMPILER2) || INCLUDE_JVMCI
77 // C2 and JVMCI use ebp as a general register see if NULL fp helps
78 frame ret_frame2(ret_sp, NULL, addr.pc());
79 if (!ret_frame2.safe_for_sender(jt)) {
80 // nothing else to try if the frame isn't good
81 return false;
82 }
83 ret_frame = ret_frame2;
84 #else
85 // nothing else to try if the frame isn't good
86 return false;
87 #endif /* COMPILER2 || INCLUDE_JVMCI */
88 }
89 *fr_addr = ret_frame;
90 return true;
91 }
92
93 // nothing else to try
94 return false;
95 }
96
97 void JavaThread::cache_global_variables() { }
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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::Bsd::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 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
69 // In the middle of a trampoline call. Bail out for safety.
70 // This happens rarely so shouldn't affect profiling.
71 return false;
72 }
73
74 frame ret_frame(ret_sp, ret_fp, addr.pc());
75 if (!ret_frame.safe_for_sender(jt)) {
76 #if COMPILER2_OR_JVMCI
77 // C2 and JVMCI use ebp as a general register see if NULL fp helps
78 frame ret_frame2(ret_sp, NULL, addr.pc());
79 if (!ret_frame2.safe_for_sender(jt)) {
80 // nothing else to try if the frame isn't good
81 return false;
82 }
83 ret_frame = ret_frame2;
84 #else
85 // nothing else to try if the frame isn't good
86 return false;
87 #endif // COMPILER2_OR_JVMCI
88 }
89 *fr_addr = ret_frame;
90 return true;
91 }
92
93 // nothing else to try
94 return false;
95 }
96
97 void JavaThread::cache_global_variables() { }
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