Moved upb_msg parts that depend on def to a separate msgfactory.{c,h}.

Also got rid of the premature "v1" business that was attempting
to create a binary compatibility story.

Also added an in-progress CMakeLists.txt file.

1 files changed, 40 insertions, 0 deletions

diff --git a/upb/msgfactory.h b/upb/msgfactory.h
new file mode 100644
index 0000000..73a26ba
--- /dev/null
+++ b/upb/msgfactory.h
@@ -0,0 +1,40 @@
+
+#include "upb/def.h"
+#include "upb/msg.h"
+
+#ifndef UPB_MSGFACTORY_H_
+#define UPB_MSGFACTORY_H_
+
+UPB_DECLARE_TYPE(upb::MessageFactory, upb_msgfactory)
+
+/** upb_msgfactory ************************************************************/
+
+/* A upb_msgfactory contains a cache of upb_msglayout, upb_handlers, and
+ * upb_visitorplan objects.  These are the objects necessary to represent,
+ * populate, and and visit upb_msg objects.
+ *
+ * These caches are all populated by upb_msgdef, and lazily created on demand.
+ */
+
+/* Creates and destroys a msgfactory, respectively.  The messages for this
+ * msgfactory must come from |symtab| (which should outlive the msgfactory). */
+upb_msgfactory *upb_msgfactory_new(const upb_symtab *symtab);
+void upb_msgfactory_free(upb_msgfactory *f);
+
+const upb_symtab *upb_msgfactory_symtab(const upb_msgfactory *f);
+
+/* The functions to get cached objects, lazily creating them on demand.  These
+ * all require:
+ *
+ * - m is in upb_msgfactory_symtab(f)
+ * - upb_msgdef_mapentry(m) == false (since map messages can't have layouts).
+ *
+ * The returned objects will live for as long as the msgfactory does.
+ *
+ * TODO(haberman): consider making this thread-safe and take a const
+ * upb_msgfactory. */
+const upb_msglayout *upb_msgfactory_getlayout(upb_msgfactory *f,
+                                              const upb_msgdef *m);
+
+
+#endif /* UPB_MSGFACTORY_H_ */