"Diagrams are code" exists as ladder diagrams for PLC, from which Structured Text can be derived, which typically are used by PICs for simple to estimate time behavior in very time-sensitive/critical (real-time) control applications.

Stack + dynamic memory and other system resource modeling would need proper models with especially memory life-time visualization being an open research problem, let alone resource tracking being unsolved (Valgrind offers no flexible API, license restrictions, incomplete and other platforms than Linux are less complete etc).

Reads and writes conditioned on arithmetic have all the issues related to complex arithmetic and I am unaware of (time) models for speculation or instruction re-ordering, let alone applied compiler optimizations.