src/cpu/x86/vm/sharedRuntime_x86_64.cpp

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

*** 4015,4026 ****
    __ push(rdx);
    __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog
  
    // Save callee-saved registers.  See x86_64.ad.
  
!   // rbp is an implicitly saved callee saved register (i.e. the calling
!   // convention will save restore it in prolog/epilog) Other than that
    // there are no callee save registers now that adapter frames are gone.
  
    __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
  
    // Store exception in Thread object. We cannot pass any arguments to the
--- 4015,4026 ----
    __ push(rdx);
    __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog
  
    // Save callee-saved registers.  See x86_64.ad.
  
!   // rbp is an implicitly saved callee saved register (i.e., the calling
!   // convention will save/restore it in the prolog/epilog). Other than that
    // there are no callee save registers now that adapter frames are gone.
  
    __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
  
    // Store exception in Thread object. We cannot pass any arguments to the
*** 4058,4082 ****
  
    __ reset_last_Java_frame(false, true);
  
    // Restore callee-saved registers
  
!   // rbp is an implicitly saved callee saved register (i.e. the calling
    // convention will save restore it in prolog/epilog) Other than that
!   // there are no callee save registers no that adapter frames are gone.
  
    __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt));
  
    __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog
    __ pop(rdx);                  // No need for exception pc anymore
  
    // rax: exception handler
  
-   // Restore SP from BP if the exception PC is a MethodHandle call site.
-   __ cmpl(Address(r15_thread, JavaThread::is_method_handle_return_offset()), 0);
-   __ cmovptr(Assembler::notEqual, rsp, rbp_mh_SP_save);
- 
    // We have a handler in rax (could be deopt blob).
    __ mov(r8, rax);
  
    // Get the exception oop
    __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
--- 4058,4078 ----
  
    __ reset_last_Java_frame(false, true);
  
    // Restore callee-saved registers
  
!   // rbp is an implicitly saved callee-saved register (i.e., the calling
    // convention will save restore it in prolog/epilog) Other than that
!   // there are no callee save registers now that adapter frames are gone.
  
    __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt));
  
    __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog
    __ pop(rdx);                  // No need for exception pc anymore
  
    // rax: exception handler
  
    // We have a handler in rax (could be deopt blob).
    __ mov(r8, rax);
  
    // Get the exception oop
    __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));