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(expand_builtin, BUILT_IN_NEXT_ARG case): Verify that 

parameter is last named argument.

From-SVN: r6854
This commit is contained in:
Jim Wilson 1994-03-23 14:16:55 -08:00
parent 8d0aed4706
commit c4dfe0fc06
1 changed files with 18 additions and 11 deletions
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29
gcc/expr.c
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@ -6956,24 +6956,31 @@ expand_builtin (exp, target, subtarget, mode, ignore)
#endif
}
/* Return the address of the first anonymous stack arg. */
/* Return the address of the first anonymous stack arg.
This should only be used for stdarg functions. */
case BUILT_IN_NEXT_ARG:
{
tree parm;
tree fntype = TREE_TYPE (current_function_decl);
tree fnargs = DECL_ARGUMENTS (current_function_decl);
if (!(TYPE_ARG_TYPES (fntype) != 0
&& (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
!= void_type_node))
&& !(fnargs
&& (parm = tree_last (fnargs)) != 0
&& DECL_NAME (parm)
&& (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)),
"__builtin_va_alist"))))
tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
tree arg;
if (TYPE_ARG_TYPES (fntype) == 0
|| (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
== void_type_node))
{
error ("`va_start' used in function with fixed args");
return const0_rtx;
}
arg = TREE_VALUE (arglist);
/* Strip off all nops for the sake of the comparison. This is not
quite the same as STRIP_NOPS. It does more. */
while (TREE_CODE (arg) == NOP_EXPR
|| TREE_CODE (arg) == CONVERT_EXPR
|| TREE_CODE (arg) == NON_LVALUE_EXPR)
arg = TREE_OPERAND (arg, 0);
if (arg != last_parm)
warning ("second parameter of `va_start' not last named argument");
}
return expand_binop (Pmode, add_optab,