C++ oop::print方法代码示例

 virtual void do_object(oop obj) {
   if (obj->is_klass()) {
     Klass* k = klassOop(obj)->klass_part();
     if (k->name() != NULL) {
       ResourceMark rm;
       const char* ext = k->external_name();
       if ( strcmp(_target, ext) == 0 ) {
         tty->print_cr("Found " INTPTR_FORMAT, obj);
         obj->print();
       }
     }
   }
 }

void trace_method_handle_stub(const char* adaptername,
                              oop mh,
                              intptr_t* saved_regs,
                              intptr_t* entry_sp) {
  // called as a leaf from native code: do not block the JVM!
  bool has_mh = (strstr(adaptername, "/static") == NULL &&
                 strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
  const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
  tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
                adaptername, mh_reg_name,
                mh, entry_sp);

  if (Verbose) {
    tty->print_cr("Registers:");
    const int saved_regs_count = RegisterImpl::number_of_registers;
    for (int i = 0; i < saved_regs_count; i++) {
      Register r = as_Register(i);
      // The registers are stored in reverse order on the stack (by pusha).
      tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
      if ((i + 1) % 4 == 0) {
        tty->cr();
      } else {
        tty->print(", ");
      }
    }
    tty->cr();

    {
     // dumping last frame with frame::describe

      JavaThread* p = JavaThread::active();

      ResourceMark rm;
      PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
      FrameValues values;

      // Note: We want to allow trace_method_handle from any call site.
      // While trace_method_handle creates a frame, it may be entered
      // without a PC on the stack top (e.g. not just after a call).
      // Walking that frame could lead to failures due to that invalid PC.
      // => carefully detect that frame when doing the stack walking

      // Current C frame
      frame cur_frame = os::current_frame();

      // Robust search of trace_calling_frame (independant of inlining).
      // Assumes saved_regs comes from a pusha in the trace_calling_frame.
      assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
      frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
      while (trace_calling_frame.fp() < saved_regs) {
        trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
      }

      // safely create a frame and call frame::describe
      intptr_t *dump_sp = trace_calling_frame.sender_sp();
      intptr_t *dump_fp = trace_calling_frame.link();

      bool walkable = has_mh; // whether the traced frame shoud be walkable

      if (walkable) {
        // The previous definition of walkable may have to be refined
        // if new call sites cause the next frame constructor to start
        // failing. Alternatively, frame constructors could be
        // modified to support the current or future non walkable
        // frames (but this is more intrusive and is not considered as
        // part of this RFE, which will instead use a simpler output).
        frame dump_frame = frame(dump_sp, dump_fp);
        dump_frame.describe(values, 1);
      } else {
        // Stack may not be walkable (invalid PC above FP):
        // Add descriptions without building a Java frame to avoid issues
        values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
        values.describe(-1, dump_sp, "sp for #1");
      }
      values.describe(-1, entry_sp, "raw top of stack");

      tty->print_cr("Stack layout:");
      values.print(p);
    }
    if (has_mh && mh->is_oop()) {
      mh->print();
      if (java_lang_invoke_MethodHandle::is_instance(mh)) {
        if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
          java_lang_invoke_MethodHandle::form(mh)->print();
      }
    }
  }
}