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src/hotspot/os_cpu/linux_ppc/thread_linux_ppc.cpp
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rev 51076 : JFR profiling for PPC64
* * *
PPC64: jfr profiling
*** 40,53 ****
return frame(sp, pc);
}
bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
ucontext_t* uc = (ucontext_t*) ucontext;
! *fr_addr = frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],
(address)uc->uc_mcontext.regs->nip);
return true;
}
// Forte Analyzer AsyncGetCallTrace profiling support is not implemented on Linux/PPC.
bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {
Unimplemented();
--- 40,97 ----
return frame(sp, pc);
}
bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
+ assert(this->is_Java_thread(), "must be JavaThread");
+
+ // If we have a last_Java_frame, then we should use it even if
+ // isInJava == true. It should be more reliable than ucontext info.
+ if (has_last_Java_frame() && frame_anchor()->walkable()) {
+ *fr_addr = pd_last_frame();
+ return true;
+ }
+
+ // At this point, we don't have a last_Java_frame, so
+ // we try to glean some information out of the ucontext
+ // if we were running Java code when SIGPROF came in.
+ if (isInJava) {
ucontext_t* uc = (ucontext_t*) ucontext;
! frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],
(address)uc->uc_mcontext.regs->nip);
+
+ if (ret_frame.pc() == NULL) {
+ // ucontext wasn't useful
+ return false;
+ }
+
+ if (ret_frame.is_interpreted_frame()) {
+ frame::ijava_state* istate = ret_frame.get_ijava_state();
+ if (!((Method*)(istate->method))->is_metaspace_object()) {
+ return false;
+ }
+ uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];
+ uint64_t istate_bcp = istate->bcp;
+ uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base());
+ uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->code_size());
+ if (istate_bcp >= code_start && istate_bcp < code_end) {
+ // we have a valid bcp, don't touch it, do nothing
+ } else if (reg_bcp >= code_start && reg_bcp < code_end) {
+ istate->bcp = reg_bcp;
+ } else {
+ return false;
+ }
+ }
+ if (!ret_frame.safe_for_sender(this)) {
+ // nothing else to try if the frame isn't good
+ return false;
+ }
+ *fr_addr = ret_frame;
return true;
+ }
+ // nothing else to try
+ return false;
}
// Forte Analyzer AsyncGetCallTrace profiling support is not implemented on Linux/PPC.
bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {
Unimplemented();
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