src/cpu/sparc/vm/sharedRuntime_sparc.cpp

rev 5188 : 8024344: PPC64 (part 112): C argument in register AND stack slot.
Summary: On PPC, the first 13 floating point arguments to C calls are passed in floating point registers. Also, all but the first 8 arguments are passed on the stack. So there can be floating point arguments that are passed on the stack and in a register. We duplicate the regs datastructure in c_calling_convention() to represent this.

*** 1116,1126 ****
--- 1116,1128 ----
  }
  
  
  int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
                                           VMRegPair *regs,
+                                          VMRegPair *regs2,
                                           int total_args_passed) {
+     assert(regs2 == NULL, "not needed on sparc");
  
      // Return the number of VMReg stack_slots needed for the args.
      // This value does not include an abi space (like register window
      // save area).
  
*** 2094,2104 ****
    // Now figure out where the args must be stored and how much stack space
    // they require (neglecting out_preserve_stack_slots but space for storing
    // the 1st six register arguments). It's weird see int_stk_helper.
    //
    int out_arg_slots;
!   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
  
    if (is_critical_native) {
      // Critical natives may have to call out so they need a save area
      // for register arguments.
      int double_slots = 0;
--- 2096,2106 ----
    // Now figure out where the args must be stored and how much stack space
    // they require (neglecting out_preserve_stack_slots but space for storing
    // the 1st six register arguments). It's weird see int_stk_helper.
    //
    int out_arg_slots;
!   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args);
  
    if (is_critical_native) {
      // Critical natives may have to call out so they need a save area
      // for register arguments.
      int double_slots = 0;
*** 2841,2851 ****
    // Now figure out where the args must be stored and how much stack space
    // they require (neglecting out_preserve_stack_slots but space for storing
    // the 1st six register arguments). It's weird see int_stk_helper.
    //
    int out_arg_slots;
!   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
  
    // Calculate the total number of stack slots we will need.
  
    // First count the abi requirement plus all of the outgoing args
    int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
--- 2843,2853 ----
    // Now figure out where the args must be stored and how much stack space
    // they require (neglecting out_preserve_stack_slots but space for storing
    // the 1st six register arguments). It's weird see int_stk_helper.
    //
    int out_arg_slots;
!   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args);
  
    // Calculate the total number of stack slots we will need.
  
    // First count the abi requirement plus all of the outgoing args
    int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;