src/cpu/x86/vm/sharedRuntime_x86_32.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.

@@ -975,11 +975,13 @@
   return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
 }
 
 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
                                          VMRegPair *regs,
+                                         VMRegPair *regs2,
                                          int total_args_passed) {
+  assert(regs2 == NULL, "not needed on x86");
 // We return the amount of VMRegImpl stack slots we need to reserve for all
 // the arguments NOT counting out_preserve_stack_slots.
 
   uint    stack = 0;        // All arguments on stack
 

@@ -1622,11 +1624,11 @@
   }
 
   // Now figure out where the args must be stored and how much stack space
   // they require.
   int out_arg_slots;
-  out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
+  out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args);
 
   // Compute framesize for the wrapper.  We need to handlize all oops in
   // registers a max of 2 on x86.
 
   // Calculate the total number of stack slots we will need.

@@ -2493,11 +2495,11 @@
 
   // Now figure out where the args must be stored and how much stack space
   // they require (neglecting out_preserve_stack_slots).
 
   int out_arg_slots;
-  out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
+  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;