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-rw-r--r--src/include/assert.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/include/assert.h b/src/include/assert.h
index 90cc2a8b18..a4ae39f606 100644
--- a/src/include/assert.h
+++ b/src/include/assert.h
@@ -37,4 +37,25 @@
#define assert(statement) ASSERT(statement)
+/*
+ * These macros can be used to assert that a certain branch of code is dead and
+ * will be compile-time eliminated. This differs from _Static_assert(), which
+ * will generate a compiler error even if the scope it was called from is dead
+ * code. This may be useful to double-check things like constants that are only
+ * valid if a certain Kconfig option is set.
+ */
+#define __dead_code(message, line) do { \
+ __attribute__((error(#message " in " __FILE__ ":" #line))) \
+ extern void dead_code_assertion_failed_##line(void); \
+ dead_code_assertion_failed_##line(); \
+} while (0)
+#define _dead_code(message, line) __dead_code(message, line)
+#define dead_code(message) _dead_code(message, __LINE__)
+
+/* This can be used in the context of an expression of type 'type'. */
+#define dead_code_t(type, message) ({ \
+ dead_code(message); \
+ *(type *)(uintptr_t)0; \
+})
+
#endif // __ASSERT_H__