src/cpu/x86/vm/assembler_x86.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

*** 139,150 ****
  #define rscratch1 noreg
  #define rscratch2 noreg
  
  #endif // _LP64
  
! // JSR 292 fixed register usages:
! REGISTER_DECLARATION(Register, rbp_mh_SP_save, rbp);
  
  // Address is an abstraction used to represent a memory location
  // using any of the amd64 addressing modes with one object.
  //
  // Note: A register location is represented via a Register, not
--- 139,152 ----
  #define rscratch1 noreg
  #define rscratch2 noreg
  
  #endif // _LP64
  
! // JSR 292
! // On x86, the SP does not have to be saved when invoking method handle intrinsics
! // or compiled lambda forms. We indicate that by setting rbp_mh_SP_save to noreg.
! REGISTER_DECLARATION(Register, rbp_mh_SP_save, noreg);
  
  // Address is an abstraction used to represent a memory location
  // using any of the amd64 addressing modes with one object.
  //
  // Note: A register location is represented via a Register, not