1 files changed, 141 insertions, 0 deletions
diff --git a/param.c b/param.c
new file mode 100644
index 0000000..a712dad
--- /dev/null
+++ b/param.c
@@ -0,0 +1,141 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "param.h"
+#include "type.h"
+#include "value.h"
+#include "expr.h"
+
+void
+param_init_type(struct param *param, struct arg_type_info *type, int own)
+{
+	param->flavor = PARAM_FLAVOR_TYPE;
+	param->u.type.type = type;
+	param->u.type.own_type = own;
+}
+
+void
+param_init_stop(struct param *param)
+{
+	param->flavor = PARAM_FLAVOR_STOP;
+}
+
+void
+param_init_pack(struct param *param, enum param_pack_flavor ppflavor,
+		struct expr_node *args, size_t nargs, int own_args,
+		struct param_enum *(*init)(struct value *cb_args,
+					   size_t nargs,
+					   struct value_dict *arguments),
+		int (*next)(struct param_enum *context,
+			    struct arg_type_info *infop,
+			    int *insert_stop),
+		enum param_status (*stop)(struct param_enum *ctx,
+					  struct value *value),
+		void (*done)(struct param_enum *))
+{
+	param->flavor = PARAM_FLAVOR_PACK;
+	param->u.pack.args = args;
+	param->u.pack.nargs = nargs;
+	param->u.pack.own_args = own_args;
+	param->u.pack.ppflavor = ppflavor;
+	param->u.pack.init = init;
+	param->u.pack.next = next;
+	param->u.pack.stop = stop;
+	param->u.pack.done = done;
+}
+
+struct param_enum *
+param_pack_init(struct param *param, struct value_dict *fargs)
+{
+	struct value cb_args[param->u.pack.nargs];
+	size_t i;
+
+	/* For evaluation of argument expressions, we pass in this as
+	 * a "current" value.  */
+	struct arg_type_info *void_type = type_get_simple(ARGTYPE_VOID);
+	struct value void_val;
+	value_init_detached(&void_val, NULL, void_type, 0);
+
+	struct param_enum *ret = NULL;
+	for (i = 0; i < param->u.pack.nargs; ++i) {
+		if (expr_eval(&param->u.pack.args[i], &void_val,
+			      fargs, &cb_args[i]) < 0)
+			goto release;
+	}
+
+	ret = param->u.pack.init(cb_args, param->u.pack.nargs, fargs);
+
+release:
+	while (i-- > 0)
+		value_destroy(&cb_args[i]);
+	return ret;
+}
+
+int
+param_pack_next(struct param *param, struct param_enum *context,
+		struct arg_type_info *infop, int *insert_stop)
+{
+	return param->u.pack.next(context, infop, insert_stop);
+}
+
+enum param_status
+param_pack_stop(struct param *param,
+		struct param_enum *context, struct value *value)
+{
+	return param->u.pack.stop(context, value);
+}
+
+void
+param_pack_done(struct param *param, struct param_enum *context)
+{
+	return param->u.pack.done(context);
+}
+
+void
+param_destroy(struct param *param)
+{
+	if (param == NULL)
+		return;
+
+	switch (param->flavor) {
+	case PARAM_FLAVOR_TYPE:
+		if (param->u.type.own_type) {
+			type_destroy(param->u.type.type);
+			free(param->u.type.type);
+		}
+		return;
+
+	case PARAM_FLAVOR_PACK:
+		if (param->u.pack.own_args) {
+			size_t i;
+			for (i = 0; i < param->u.pack.nargs; ++i)
+				expr_destroy(&param->u.pack.args[i]);
+			free(param->u.pack.args);
+		}
+	case PARAM_FLAVOR_STOP:
+		return;
+	}
+
+	assert(!"Unknown value of param flavor!");
+	abort();
+}