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(assign_parms): Use new FUNCTION_ARG_CALLEE_COPIES macro.

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From-SVN: r4184
This commit is contained in:
Doug Evans 1993-04-19 19:25:29 +00:00
parent 5e0de25120
commit 137a2a7b83
1 changed files with 47 additions and 0 deletions
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47
gcc/function.c
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@ -3178,6 +3178,53 @@ assign_parms (fndecl, second_time)
emit_move_insn (parmreg, DECL_RTL (parm));
DECL_RTL (parm) = parmreg;
}
#ifdef FUNCTION_ARG_CALLEE_COPIES
/* If we are passed an arg by reference and it is our responsibility
to make a copy, do it now.
PASSED_TYPE and PASSED mode now refer to the pointer, not the
original argument, so we must recreate them in the call to
FUNCTION_ARG_CALLEE_COPIES. */
/* ??? Later add code to handle the case that if the argument isn't
modified, don't do the copy. */
else if (passed_pointer
&& FUNCTION_ARG_CALLEE_COPIES (args_so_far,
TYPE_MODE (DECL_ARG_TYPE (parm)),
DECL_ARG_TYPE (parm),
! last_named))
{
rtx copy;
tree type = DECL_ARG_TYPE (parm);
/* This sequence may involve a library call perhaps clobbering
registers that haven't been copied to pseudos yet. */
push_to_sequence (conversion_insns);
if (TYPE_SIZE (type) == 0
|| TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
{
/* This is a variable sized object. */
/* ??? Can we use expr_size here? */
rtx size_rtx = expand_expr (size_in_bytes (type), NULL_RTX,
TYPE_MODE(sizetype), 0);
copy = gen_rtx (MEM, BLKmode,
allocate_dynamic_stack_space (size_rtx, NULL_RTX,
TYPE_ALIGN (type)));
}
else
{
int size = int_size_in_bytes (type);
copy = assign_stack_temp (BLKmode, size, 1);
}
store_expr (parm, copy, 0);
emit_move_insn (parmreg, XEXP (copy, 0));
conversion_insns = get_insns ();
end_sequence ();
}
#endif /* FUNCTION_ARG_CALLEE_COPIES */
/* In any case, record the parm's desired stack location
in case we later discover it must live in the stack. */