lib: Add MODULE_CONTEXT_REQUIRE

This will panic instead of return NULL. Should satisfy static
analyzers when used.

diff --git a/src/lib/module-context.h b/src/lib/module-context.h
index cc6bd8a2c7ff3fa5099fe98926e95ef27a051435..13005f55df14b241c3b3a28119626629ef8f84ee 100644 (file)
--- a/src/lib/module-context.h
+++ b/src/lib/module-context.h
@@ -51,6 +51,15 @@
                module_get_context_id(&(id_ctx).id)) + \
            OBJ_REGISTER_COMPATIBLE(obj, id_ctx))) : NULL)
 
+/* Will crash if context is missing. This is mainly used to simplify code and
+   keep static analyzers happy. This syntax discards result of i_panic and
+   returns NULL instead to keep compilers happy. */
+#define MODULE_CONTEXT_REQUIRE(obj, id_ctx) \
+       (module_get_context_id(&(id_ctx).id) < array_count(&(obj)->module_contexts) ? \
+        (*((void **)array_idx_modifiable(&(obj)->module_contexts,      \
+               module_get_context_id(&(id_ctx).id)) + \
+           OBJ_REGISTER_COMPATIBLE(obj, id_ctx))) : (i_panic("Module context " #id_ctx " missing"), NULL))
+
 #ifdef HAVE_TYPEOF
 #  define MODULE_CONTEXT_DEFINE(_name, _reg) \
        struct _name { \