615   const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words;
 616   if (fp() + interpreter_frame_initial_sp_offset < sp()) {
 617     return false;
 618   }
 619   // These are hacks to keep us out of trouble.
 620   // The problem with these is that they mask other problems
 621   if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
 622     return false;
 623   }
 624   // do some validation of frame elements
 625 
 626   // first the method
 627 
 628   Method* m = *interpreter_frame_method_addr();
 629 
 630   // validate the method we'd find in this potential sender
 631   if (!m->is_valid_method()) return false;
 632 
 633   // stack frames shouldn't be much larger than max_stack elements
 634 
 635   if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
 636     return false;
 637   }
 638 
 639   // validate bci/bcp
 640 
 641   address bcp = interpreter_frame_bcp();
 642   if (m->validate_bci_from_bcp(bcp) < 0) {
 643     return false;
 644   }
 645 
 646   // validate ConstantPoolCache*
 647   ConstantPoolCache* cp = *interpreter_frame_cache_addr();
 648   if (cp == NULL || !cp->is_metaspace_object()) return false;
 649 
 650   // validate locals
 651 
 652   address locals =  (address) *interpreter_frame_locals_addr();
 653 
 654   if (locals > thread->stack_base() || locals < (address) fp()) return false;
 655 

 615   const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words;
 616   if (fp() + interpreter_frame_initial_sp_offset < sp()) {
 617     return false;
 618   }
 619   // These are hacks to keep us out of trouble.
 620   // The problem with these is that they mask other problems
 621   if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
 622     return false;
 623   }
 624   // do some validation of frame elements
 625 
 626   // first the method
 627 
 628   Method* m = *interpreter_frame_method_addr();
 629 
 630   // validate the method we'd find in this potential sender
 631   if (!m->is_valid_method()) return false;
 632 
 633   // stack frames shouldn't be much larger than max_stack elements
 634 
 635   if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
 636     return false;
 637   }
 638 
 639   // validate bci/bcp
 640 
 641   address bcp = interpreter_frame_bcp();
 642   if (m->validate_bci_from_bcp(bcp) < 0) {
 643     return false;
 644   }
 645 
 646   // validate ConstantPoolCache*
 647   ConstantPoolCache* cp = *interpreter_frame_cache_addr();
 648   if (cp == NULL || !cp->is_metaspace_object()) return false;
 649 
 650   // validate locals
 651 
 652   address locals =  (address) *interpreter_frame_locals_addr();
 653 
 654   if (locals > thread->stack_base() || locals < (address) fp()) return false;
 655