src/cpu/x86/vm/frame_x86.inline.hpp

rev 7386 : 8068945: Use RBP register as proper frame pointer in JIT compiled code on x86
Summary: Introduce the PreserveFramePointer flag to control if RBP is used as the frame pointer or as a general purpose register.
Reviewed-by: kvn, roland, dlong, enevill, shade

*** 91,101 ****
    // when last_Java_sp is non-null but the pc fetched is junk. If we are truly
    // unlucky the junk value could be to a zombied method and we'll die on the
    // find_blob call. This is also why we can have no asserts on the validity
    // of the pc we find here. AsyncGetCallTrace -> pd_get_top_frame_for_signal_handler
    // -> pd_last_frame should use a specialized version of pd_last_frame which could
!   // call a specilaized frame constructor instead of this one.
    // Then we could use the assert below. However this assert is of somewhat dubious
    // value.
    // assert(_pc != NULL, "no pc?");
  
    _cb = CodeCache::find_blob(_pc);
--- 91,101 ----
    // when last_Java_sp is non-null but the pc fetched is junk. If we are truly
    // unlucky the junk value could be to a zombied method and we'll die on the
    // find_blob call. This is also why we can have no asserts on the validity
    // of the pc we find here. AsyncGetCallTrace -> pd_get_top_frame_for_signal_handler
    // -> pd_last_frame should use a specialized version of pd_last_frame which could
!   // call a specialized frame constructor instead of this one.
    // Then we could use the assert below. However this assert is of somewhat dubious
    // value.
    // assert(_pc != NULL, "no pc?");
  
    _cb = CodeCache::find_blob(_pc);