(* Title: HOL/Hoare/HeapSyntaxAbort.thy Author: Tobias Nipkow Copyright 2002 TUM
*)
section \<open>Heap syntax (abort)\<close>
theory HeapSyntaxAbort imports Hoare_Logic_Abort Heap begin
subsection "Field access and update"
text\<open>Heap update \<open>p^.h := e\<close> is now guarded against \<^term>\<open>p\<close>
being Null. However, \<^term>\<open>p\<close> may still be illegal,
e.g. uninitialized or dangling. To guard against that, one needs a
more detailed model of the heap where allocated and free addresses are
distinguished, e.g. by making the heap a map, or by carrying the set
of free addresses around. This is needed anyway as soon as we want to
reason about storage allocation/deallocation.\<close>
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