agent/src/share/classes/sun/jvm/hotspot/runtime/x86/X86Frame.java

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

*** 315,344 ****
    }
  
    //------------------------------------------------------------------------------
    // frame::adjust_unextended_sp
    private void adjustUnextendedSP() {
!     // If we are returning to a compiled MethodHandle call site, the
!     // saved_fp will in fact be a saved value of the unextended SP.  The
!     // simplest way to tell whether we are returning to such a call site
!     // is as follows:
  
      CodeBlob cb = cb();
      NMethod senderNm = (cb == null) ? null : cb.asNMethodOrNull();
      if (senderNm != null) {
!       // If the sender PC is a deoptimization point, get the original
!       // PC.  For MethodHandle call site the unextended_sp is stored in
!       // saved_fp.
!       if (senderNm.isDeoptMhEntry(getPC())) {
!         // DEBUG_ONLY(verifyDeoptMhOriginalPc(senderNm, getFP()));
!         raw_unextendedSP = getFP();
!       }
!       else if (senderNm.isDeoptEntry(getPC())) {
!         // DEBUG_ONLY(verifyDeoptOriginalPc(senderNm, raw_unextendedSp));
!       }
!       else if (senderNm.isMethodHandleReturn(getPC())) {
!         raw_unextendedSP = getFP();
        }
      }
    }
  
    private Frame senderForInterpreterFrame(X86RegisterMap map) {
--- 315,335 ----
    }
  
    //------------------------------------------------------------------------------
    // frame::adjust_unextended_sp
    private void adjustUnextendedSP() {
!     // On x86, sites calling method handle intrinsics and lambda forms are treated
!     // as any other call site. Therefore, no special action is needed when we are
!     // returning to any of these call sites.
  
      CodeBlob cb = cb();
      NMethod senderNm = (cb == null) ? null : cb.asNMethodOrNull();
      if (senderNm != null) {
!       // If the sender PC is a deoptimization point, get the original PC.
!       if (senderNm.isDeoptEntry(getPC()) ||
!           senderNm.isDeoptMhEntry(getPC())) {
!         // DEBUG_ONLY(verifyDeoptriginalPc(senderNm, raw_unextendedSp));
        }
      }
    }
  
    private Frame senderForInterpreterFrame(X86RegisterMap map) {