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src/hotspot/os_cpu/windows_x86/thread_windows_x86.cpp

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 46   return pd_get_top_frame(fr_addr, ucontext, isInJava);
 47 }
 48 
 49 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
 50 
 51   assert(this->is_Java_thread(), "must be JavaThread");
 52 
 53   JavaThread* jt = (JavaThread *)this;
 54 
 55   // If we have a last_Java_frame, then we should use it even if
 56   // isInJava == true.  It should be more reliable than CONTEXT info.
 57   if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
 58     *fr_addr = jt->pd_last_frame();
 59     return true;
 60   }
 61 
 62   // At this point, we don't have a last_Java_frame, so
 63   // we try to glean some information out of the CONTEXT
 64   // if we were running Java code when SIGPROF came in.
 65   if (isInJava) {
 66     CONTEXT* uc = (CONTEXT*)ucontext;
 67 
 68 #ifdef AMD64
 69     intptr_t* ret_fp = (intptr_t*) uc->Rbp;
 70     intptr_t* ret_sp = (intptr_t*) uc->Rsp;
 71     address addr = (address)uc->Rip;
 72 #else
 73     intptr_t* ret_fp = (intptr_t*) uc->Ebp;
 74     intptr_t* ret_sp = (intptr_t*) uc->Esp;
 75     address addr = (address)uc->Eip;
 76 #endif // AMD64
 77     if (addr == NULL || ret_sp == NULL ) {
 78       // CONTEXT wasn't useful
 79       return false;
 80     }
 81 
 82     if (MetaspaceShared::is_in_trampoline_frame(addr)) {
 83       // In the middle of a trampoline call. Bail out for safety.
 84       // This happens rarely so shouldn't affect profiling.
 85       return false;
 86     }
 87 
 88     frame ret_frame(ret_sp, ret_fp, addr);
 89     if (!ret_frame.safe_for_sender(jt)) {
 90 #if COMPILER2_OR_JVMCI
 91       // C2 and JVMCI use ebp as a general register see if NULL fp helps
 92       frame ret_frame2(ret_sp, NULL, addr);
 93       if (!ret_frame2.safe_for_sender(jt)) {
 94         // nothing else to try if the frame isn't good
 95         return false;
 96       }
 97       ret_frame = ret_frame2;
 98 #else
 99       // nothing else to try if the frame isn't good
100       return false;
101 #endif // COMPILER2_OR_JVMCI
102     }
103     *fr_addr = ret_frame;
104     return true;
105   }
106 
107   // nothing else to try
108   return false;
109 }
110 
111 void JavaThread::cache_global_variables() { }

 46   return pd_get_top_frame(fr_addr, ucontext, isInJava);
 47 }
 48 
 49 bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava) {
 50 
 51   assert(this->is_Java_thread(), "must be JavaThread");
 52 
 53   JavaThread* jt = (JavaThread *)this;
 54 
 55   // If we have a last_Java_frame, then we should use it even if
 56   // isInJava == true.  It should be more reliable than CONTEXT info.
 57   if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
 58     *fr_addr = jt->pd_last_frame();
 59     return true;
 60   }
 61 
 62   // At this point, we don't have a last_Java_frame, so
 63   // we try to glean some information out of the CONTEXT
 64   // if we were running Java code when SIGPROF came in.
 65   if (isInJava) {
 66     frame ret_frame = os::fetch_frame_from_context(ucontext);
 67     if (ret_frame.pc() == NULL || ret_frame.sp() == NULL ) {










 68       // CONTEXT wasn't useful
 69       return false;
 70     }
 71 
 72     if (MetaspaceShared::is_in_trampoline_frame(ret_frame.pc())) {
 73       // In the middle of a trampoline call. Bail out for safety.
 74       // This happens rarely so shouldn't affect profiling.
 75       return false;
 76     }
 77 

 78     if (!ret_frame.safe_for_sender(jt)) {
 79 #if COMPILER2_OR_JVMCI
 80       // C2 and JVMCI use ebp as a general register see if NULL fp helps
 81       frame ret_frame2(ret_frame.sp(), NULL, ret_frame.pc());
 82       if (!ret_frame2.safe_for_sender(jt)) {
 83         // nothing else to try if the frame isn't good
 84         return false;
 85       }
 86       ret_frame = ret_frame2;
 87 #else
 88       // nothing else to try if the frame isn't good
 89       return false;
 90 #endif // COMPILER2_OR_JVMCI
 91     }
 92     *fr_addr = ret_frame;
 93     return true;
 94   }
 95 
 96   // nothing else to try
 97   return false;
 98 }
 99 
100 void JavaThread::cache_global_variables() { }
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