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(expand_builtin, case BUILT_IN_NEXT_ARG): Test whether an argunment 

has been passed to __builtin_next_arg; warn if not.

From-SVN: r6994
This commit is contained in:
Richard Kenner 1994-04-06 21:33:57 -04:00
parent 18e2b1c06e
commit e4493c0410
1 changed files with 18 additions and 11 deletions
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29
gcc/expr.c
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@ -6961,8 +6961,6 @@ expand_builtin (exp, target, subtarget, mode, ignore)
case BUILT_IN_NEXT_ARG:
{
tree fntype = TREE_TYPE (current_function_decl);
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)))
@ -6973,15 +6971,24 @@ expand_builtin (exp, target, subtarget, mode, ignore)
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");
if (arglist)
{
tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
tree 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");
}
else
/* Evidently an out of date version of <stdarg.h>; can't validate
va_start's second argument, but can still work as intended. */
warning ("`__builtin_next_arg' called without an argument");
}
return expand_binop (Pmode, add_optab,