57 if (isInJava) {
58 ucontext_t* uc = (ucontext_t*) ucontext;
59
60 intptr_t* ret_fp;
61 intptr_t* ret_sp;
62 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
63 &ret_sp, &ret_fp);
64 if (addr.pc() == NULL || ret_sp == NULL ) {
65 // ucontext wasn't useful
66 return false;
67 }
68
69 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
70 // In the middle of a trampoline call. Bail out for safety.
71 // This happens rarely so shouldn't affect profiling.
72 return false;
73 }
74
75 frame ret_frame(ret_sp, ret_fp, addr.pc());
76 if (!ret_frame.safe_for_sender(jt)) {
77 #if defined(COMPILER2) || INCLUDE_JVMCI
78 // C2 and JVMCI use ebp as a general register see if NULL fp helps
79 frame ret_frame2(ret_sp, NULL, addr.pc());
80 if (!ret_frame2.safe_for_sender(jt)) {
81 // nothing else to try if the frame isn't good
82 return false;
83 }
84 ret_frame = ret_frame2;
85 #else
86 // nothing else to try if the frame isn't good
87 return false;
88 #endif /* COMPILER2 || INCLUDE_JVMCI */
89 }
90 *fr_addr = ret_frame;
91 return true;
92 }
93
94 // nothing else to try
95 return false;
96 }
97
98 void JavaThread::cache_global_variables() { }
99
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57 if (isInJava) {
58 ucontext_t* uc = (ucontext_t*) ucontext;
59
60 intptr_t* ret_fp;
61 intptr_t* ret_sp;
62 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc,
63 &ret_sp, &ret_fp);
64 if (addr.pc() == NULL || ret_sp == NULL ) {
65 // ucontext wasn't useful
66 return false;
67 }
68
69 if (MetaspaceShared::is_in_trampoline_frame(addr.pc())) {
70 // In the middle of a trampoline call. Bail out for safety.
71 // This happens rarely so shouldn't affect profiling.
72 return false;
73 }
74
75 frame ret_frame(ret_sp, ret_fp, addr.pc());
76 if (!ret_frame.safe_for_sender(jt)) {
77 #if COMPILER2_OR_JVMCI
78 // C2 and JVMCI use ebp as a general register see if NULL fp helps
79 frame ret_frame2(ret_sp, NULL, addr.pc());
80 if (!ret_frame2.safe_for_sender(jt)) {
81 // nothing else to try if the frame isn't good
82 return false;
83 }
84 ret_frame = ret_frame2;
85 #else
86 // nothing else to try if the frame isn't good
87 return false;
88 #endif // COMPILER2_OR_JVMCI
89 }
90 *fr_addr = ret_frame;
91 return true;
92 }
93
94 // nothing else to try
95 return false;
96 }
97
98 void JavaThread::cache_global_variables() { }
99
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