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src/hotspot/os_cpu/linux_ppc/thread_linux_ppc.cpp

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  49   if (has_last_Java_frame() && frame_anchor()->walkable()) {
  50     *fr_addr = pd_last_frame();
  51     return true;
  52   }
  53 
  54   // At this point, we don't have a last_Java_frame, so
  55   // we try to glean some information out of the ucontext
  56   // if we were running Java code when SIGPROF came in.
  57   if (isInJava) {
  58     ucontext_t* uc = (ucontext_t*) ucontext;
  59     frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],
  60                      (address)uc->uc_mcontext.regs->nip);
  61 
  62     if (ret_frame.pc() == NULL) {
  63       // ucontext wasn't useful
  64       return false;
  65     }
  66 
  67     if (ret_frame.is_interpreted_frame()) {
  68        frame::ijava_state* istate = ret_frame.get_ijava_state();
  69        if (MetaspaceObj::is_valid((Method*)(istate->method)) == false) {
  70          return false;
  71        }
  72        uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];
  73        uint64_t istate_bcp = istate->bcp;
  74        uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base());
  75        uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->code_size());
  76        if (istate_bcp >= code_start && istate_bcp < code_end) {
  77          // we have a valid bcp, don't touch it, do nothing
  78        } else if (reg_bcp >= code_start && reg_bcp < code_end) {
  79          istate->bcp = reg_bcp;
  80       } else {
  81          return false;
  82        }
  83     }
  84     if (!ret_frame.safe_for_sender(this)) {
  85       // nothing else to try if the frame isn't good
  86       return false;
  87     }
  88     *fr_addr = ret_frame;
  89     return true;


  49   if (has_last_Java_frame() && frame_anchor()->walkable()) {
  50     *fr_addr = pd_last_frame();
  51     return true;
  52   }
  53 
  54   // At this point, we don't have a last_Java_frame, so
  55   // we try to glean some information out of the ucontext
  56   // if we were running Java code when SIGPROF came in.
  57   if (isInJava) {
  58     ucontext_t* uc = (ucontext_t*) ucontext;
  59     frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/],
  60                      (address)uc->uc_mcontext.regs->nip);
  61 
  62     if (ret_frame.pc() == NULL) {
  63       // ucontext wasn't useful
  64       return false;
  65     }
  66 
  67     if (ret_frame.is_interpreted_frame()) {
  68        frame::ijava_state* istate = ret_frame.get_ijava_state();
  69        if (!((Method*)(istate->method))->is_metaspace_object()) {
  70          return false;
  71        }
  72        uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/];
  73        uint64_t istate_bcp = istate->bcp;
  74        uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base());
  75        uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->code_size());
  76        if (istate_bcp >= code_start && istate_bcp < code_end) {
  77          // we have a valid bcp, don't touch it, do nothing
  78        } else if (reg_bcp >= code_start && reg_bcp < code_end) {
  79          istate->bcp = reg_bcp;
  80       } else {
  81          return false;
  82        }
  83     }
  84     if (!ret_frame.safe_for_sender(this)) {
  85       // nothing else to try if the frame isn't good
  86       return false;
  87     }
  88     *fr_addr = ret_frame;
  89     return true;
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