src/HOL/Bali/WellForm.thy
author nipkow
Wed Mar 04 10:47:20 2009 +0100 (2009-03-04)
changeset 30235 58d147683393
parent 28524 644b62cf678f
child 32960 69916a850301
permissions -rw-r--r--
Made Option a separate theory and renamed option_map to Option.map
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(*  Title:      HOL/Bali/WellForm.thy
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    ID:         $Id$
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    Author:     David von Oheimb and Norbert Schirmer
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*)
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header {* Well-formedness of Java programs *}
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theory WellForm imports DefiniteAssignment begin
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text {*
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For static checks on expressions and statements, see WellType.thy
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improvements over Java Specification 1.0 (cf. 8.4.6.3, 8.4.6.4, 9.4.1):
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\begin{itemize}
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\item a method implementing or overwriting another method may have a result 
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      type that widens to the result type of the other method 
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      (instead of identical type)
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\item if a method hides another method (both methods have to be static!)
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  there are no restrictions to the result type 
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  since the methods have to be static and there is no dynamic binding of 
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  static methods
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\item if an interface inherits more than one method with the same signature, the
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  methods need not have identical return types
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\end{itemize}
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simplifications:
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\begin{itemize}
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\item Object and standard exceptions are assumed to be declared like normal 
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      classes
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\end{itemize}
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*}
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section "well-formed field declarations"
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text  {* well-formed field declaration (common part for classes and interfaces),
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        cf. 8.3 and (9.3) *}
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constdefs
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  wf_fdecl :: "prog \<Rightarrow> pname \<Rightarrow> fdecl \<Rightarrow> bool"
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 "wf_fdecl G P \<equiv> \<lambda>(fn,f). is_acc_type G P (type f)"
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lemma wf_fdecl_def2: "\<And>fd. wf_fdecl G P fd = is_acc_type G P (type (snd fd))"
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apply (unfold wf_fdecl_def)
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apply simp
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done
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section "well-formed method declarations"
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  (*well-formed method declaration,cf. 8.4, 8.4.1, 8.4.3, 8.4.5, 14.3.2, (9.4)*)
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  (* cf. 14.15, 15.7.2, for scope issues cf. 8.4.1 and 14.3.2 *)
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text {*
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A method head is wellformed if:
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\begin{itemize}
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\item the signature and the method head agree in the number of parameters
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\item all types of the parameters are visible
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\item the result type is visible
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\item the parameter names are unique
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\end{itemize} 
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*}
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constdefs
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  wf_mhead :: "prog \<Rightarrow> pname \<Rightarrow> sig \<Rightarrow> mhead \<Rightarrow> bool"
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 "wf_mhead G P \<equiv> \<lambda> sig mh. length (parTs sig) = length (pars mh) \<and>
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			    \<spacespace> ( \<forall>T\<in>set (parTs sig). is_acc_type G P T) \<and> 
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                            is_acc_type G P (resTy mh) \<and>
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			    \<spacespace> distinct (pars mh)"
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text {*
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A method declaration is wellformed if:
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\begin{itemize}
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\item the method head is wellformed
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\item the names of the local variables are unique
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\item the types of the local variables must be accessible
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\item the local variables don't shadow the parameters
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\item the class of the method is defined
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\item the body statement is welltyped with respect to the
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      modified environment of local names, were the local variables, 
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      the parameters the special result variable (Res) and This are assoziated
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      with there types. 
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\end{itemize}
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*}
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constdefs callee_lcl:: "qtname \<Rightarrow> sig \<Rightarrow> methd \<Rightarrow> lenv"
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"callee_lcl C sig m 
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 \<equiv> \<lambda> k. (case k of
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            EName e 
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            \<Rightarrow> (case e of 
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                  VNam v 
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                  \<Rightarrow>(table_of (lcls (mbody m))((pars m)[\<mapsto>](parTs sig))) v
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                | Res \<Rightarrow> Some (resTy m))
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	  | This \<Rightarrow> if is_static m then None else Some (Class C))"
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constdefs parameters :: "methd \<Rightarrow> lname set"
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"parameters m \<equiv>  set (map (EName \<circ> VNam) (pars m)) 
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                  \<union> (if (static m) then {} else {This})"
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constdefs
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  wf_mdecl :: "prog \<Rightarrow> qtname \<Rightarrow> mdecl \<Rightarrow> bool"
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 "wf_mdecl G C \<equiv> 
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      \<lambda>(sig,m).
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	  wf_mhead G (pid C) sig (mhead m) \<and> 
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          unique (lcls (mbody m)) \<and> 
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          (\<forall>(vn,T)\<in>set (lcls (mbody m)). is_acc_type G (pid C) T) \<and> 
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	  (\<forall>pn\<in>set (pars m). table_of (lcls (mbody m)) pn = None) \<and>
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          jumpNestingOkS {Ret} (stmt (mbody m)) \<and> 
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          is_class G C \<and>
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          \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr>\<turnstile>(stmt (mbody m))\<Colon>\<surd> \<and>
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          (\<exists> A. \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr> 
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                \<turnstile> parameters m \<guillemotright>\<langle>stmt (mbody m)\<rangle>\<guillemotright> A 
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               \<and> Result \<in> nrm A)"
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lemma callee_lcl_VNam_simp [simp]:
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"callee_lcl C sig m (EName (VNam v)) 
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  = (table_of (lcls (mbody m))((pars m)[\<mapsto>](parTs sig))) v"
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by (simp add: callee_lcl_def)
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lemma callee_lcl_Res_simp [simp]:
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"callee_lcl C sig m (EName Res) = Some (resTy m)" 
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by (simp add: callee_lcl_def)
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lemma callee_lcl_This_simp [simp]:
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"callee_lcl C sig m (This) = (if is_static m then None else Some (Class C))" 
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by (simp add: callee_lcl_def)
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lemma callee_lcl_This_static_simp:
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"is_static m \<Longrightarrow> callee_lcl C sig m (This) = None"
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by simp
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lemma callee_lcl_This_not_static_simp:
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"\<not> is_static m \<Longrightarrow> callee_lcl C sig m (This) = Some (Class C)"
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by simp
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lemma wf_mheadI: 
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"\<lbrakk>length (parTs sig) = length (pars m); \<forall>T\<in>set (parTs sig). is_acc_type G P T;
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  is_acc_type G P (resTy m); distinct (pars m)\<rbrakk> \<Longrightarrow>  
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  wf_mhead G P sig m"
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apply (unfold wf_mhead_def)
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apply (simp (no_asm_simp))
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done
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lemma wf_mdeclI: "\<lbrakk>  
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  wf_mhead G (pid C) sig (mhead m); unique (lcls (mbody m));  
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  (\<forall>pn\<in>set (pars m). table_of (lcls (mbody m)) pn = None); 
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  \<forall>(vn,T)\<in>set (lcls (mbody m)). is_acc_type G (pid C) T;
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  jumpNestingOkS {Ret} (stmt (mbody m));
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  is_class G C;
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  \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr>\<turnstile>(stmt (mbody m))\<Colon>\<surd>;
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  (\<exists> A. \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr> \<turnstile> parameters m \<guillemotright>\<langle>stmt (mbody m)\<rangle>\<guillemotright> A
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        \<and> Result \<in> nrm A)
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  \<rbrakk> \<Longrightarrow>  
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  wf_mdecl G C (sig,m)"
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apply (unfold wf_mdecl_def)
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apply simp
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done
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lemma wf_mdeclE [consumes 1]:  
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  "\<lbrakk>wf_mdecl G C (sig,m); 
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    \<lbrakk>wf_mhead G (pid C) sig (mhead m); unique (lcls (mbody m));  
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     \<forall>pn\<in>set (pars m). table_of (lcls (mbody m)) pn = None; 
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     \<forall>(vn,T)\<in>set (lcls (mbody m)). is_acc_type G (pid C) T;
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     jumpNestingOkS {Ret} (stmt (mbody m));
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     is_class G C;
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     \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr>\<turnstile>(stmt (mbody m))\<Colon>\<surd>;
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   (\<exists> A. \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr>\<turnstile> parameters m \<guillemotright>\<langle>stmt (mbody m)\<rangle>\<guillemotright> A
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        \<and> Result \<in> nrm A)
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    \<rbrakk> \<Longrightarrow> P
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  \<rbrakk> \<Longrightarrow> P"
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by (unfold wf_mdecl_def) simp
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lemma wf_mdeclD1: 
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"wf_mdecl G C (sig,m) \<Longrightarrow>  
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   wf_mhead G (pid C) sig (mhead m) \<and> unique (lcls (mbody m)) \<and>  
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  (\<forall>pn\<in>set (pars m). table_of (lcls (mbody m)) pn = None) \<and> 
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  (\<forall>(vn,T)\<in>set (lcls (mbody m)). is_acc_type G (pid C) T)"
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apply (unfold wf_mdecl_def)
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apply simp
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done
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lemma wf_mdecl_bodyD: 
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"wf_mdecl G C (sig,m) \<Longrightarrow>  
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 (\<exists>T. \<lparr>prg=G,cls=C,lcl=callee_lcl C sig m\<rparr>\<turnstile>Body C (stmt (mbody m))\<Colon>-T \<and> 
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      G\<turnstile>T\<preceq>(resTy m))"
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apply (unfold wf_mdecl_def)
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apply clarify
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apply (rule_tac x="(resTy m)" in exI)
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apply (unfold wf_mhead_def)
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apply (auto simp add: wf_mhead_def is_acc_type_def intro: wt.Body )
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done
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(*
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lemma static_Object_methodsE [elim!]: 
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 "\<lbrakk>wf_mdecl G Object (sig, m);static m\<rbrakk> \<Longrightarrow> R"
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apply (unfold wf_mdecl_def)
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apply auto
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done
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*)
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lemma rT_is_acc_type: 
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  "wf_mhead G P sig m \<Longrightarrow> is_acc_type G P (resTy m)"
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apply (unfold wf_mhead_def)
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apply auto
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done
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section "well-formed interface declarations"
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  (* well-formed interface declaration, cf. 9.1, 9.1.2.1, 9.1.3, 9.4 *)
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text {*
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A interface declaration is wellformed if:
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\begin{itemize}
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\item the interface hierarchy is wellstructured
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\item there is no class with the same name
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\item the method heads are wellformed and not static and have Public access
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\item the methods are uniquely named
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\item all superinterfaces are accessible
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\item the result type of a method overriding a method of Object widens to the
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      result type of the overridden method.
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      Shadowing static methods is forbidden.
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\item the result type of a method overriding a set of methods defined in the
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      superinterfaces widens to each of the corresponding result types
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\end{itemize}
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*}
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constdefs
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  wf_idecl :: "prog  \<Rightarrow> idecl \<Rightarrow> bool"
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 "wf_idecl G \<equiv> 
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    \<lambda>(I,i). 
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        ws_idecl G I (isuperIfs i) \<and> 
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	\<not>is_class G I \<and>
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	(\<forall>(sig,mh)\<in>set (imethods i). wf_mhead G (pid I) sig mh \<and> 
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                                     \<not>is_static mh \<and>
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                                      accmodi mh = Public) \<and>
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	unique (imethods i) \<and>
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        (\<forall> J\<in>set (isuperIfs i). is_acc_iface G (pid I) J) \<and>
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        (table_of (imethods i)
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          hiding (methd G Object)
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          under  (\<lambda> new old. accmodi old \<noteq> Private)
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          entails (\<lambda>new old. G\<turnstile>resTy new\<preceq>resTy old \<and> 
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                             is_static new = is_static old)) \<and> 
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        (Option.set \<circ> table_of (imethods i) 
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               hidings Un_tables((\<lambda>J.(imethds G J))`set (isuperIfs i))
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	       entails (\<lambda>new old. G\<turnstile>resTy new\<preceq>resTy old))"
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lemma wf_idecl_mhead: "\<lbrakk>wf_idecl G (I,i); (sig,mh)\<in>set (imethods i)\<rbrakk> \<Longrightarrow>  
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  wf_mhead G (pid I) sig mh \<and> \<not>is_static mh \<and> accmodi mh = Public"
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apply (unfold wf_idecl_def)
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apply auto
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done
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lemma wf_idecl_hidings: 
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"wf_idecl G (I, i) \<Longrightarrow> 
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  (\<lambda>s. Option.set (table_of (imethods i) s)) 
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  hidings Un_tables ((\<lambda>J. imethds G J) ` set (isuperIfs i))  
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  entails \<lambda>new old. G\<turnstile>resTy new\<preceq>resTy old"
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apply (unfold wf_idecl_def o_def)
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apply simp
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done
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lemma wf_idecl_hiding:
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"wf_idecl G (I, i) \<Longrightarrow> 
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 (table_of (imethods i)
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           hiding (methd G Object)
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           under  (\<lambda> new old. accmodi old \<noteq> Private)
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           entails (\<lambda>new old. G\<turnstile>resTy new\<preceq>resTy old \<and> 
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                              is_static new = is_static old))"
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apply (unfold wf_idecl_def)
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apply simp
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done
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lemma wf_idecl_supD: 
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"\<lbrakk>wf_idecl G (I,i); J \<in> set (isuperIfs i)\<rbrakk> 
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 \<Longrightarrow> is_acc_iface G (pid I) J \<and> (J, I) \<notin> (subint1 G)^+"
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apply (unfold wf_idecl_def ws_idecl_def)
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apply auto
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done
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section "well-formed class declarations"
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  (* well-formed class declaration, cf. 8.1, 8.1.2.1, 8.1.2.2, 8.1.3, 8.1.4 and
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   class method declaration, cf. 8.4.3.3, 8.4.6.1, 8.4.6.2, 8.4.6.3, 8.4.6.4 *)
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text {*
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A class declaration is wellformed if:
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\begin{itemize}
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\item there is no interface with the same name
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\item all superinterfaces are accessible and for all methods implementing 
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      an interface method the result type widens to the result type of 
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      the interface method, the method is not static and offers at least 
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      as much access 
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      (this actually means that the method has Public access, since all 
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      interface methods have public access)
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\item all field declarations are wellformed and the field names are unique
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\item all method declarations are wellformed and the method names are unique
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\item the initialization statement is welltyped
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\item the classhierarchy is wellstructured
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\item Unless the class is Object:
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      \begin{itemize}
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      \item the superclass is accessible
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      \item for all methods overriding another method (of a superclass )the
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            result type widens to the result type of the overridden method,
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            the access modifier of the new method provides at least as much
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            access as the overwritten one.
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      \item for all methods hiding a method (of a superclass) the hidden 
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   302
            method must be static and offer at least as much access rights.
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   303
            Remark: In contrast to the Java Language Specification we don't
schirmer@12854
   304
            restrict the result types of the method
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   305
            (as in case of overriding), because there seems to be no reason,
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   306
            since there is no dynamic binding of static methods.
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   307
            (cf. 8.4.6.3 vs. 15.12.1).
schirmer@12854
   308
            Stricly speaking the restrictions on the access rights aren't 
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   309
            necessary to, since the static type and the access rights 
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   310
            together determine which method is to be called statically. 
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   311
            But if a class gains more then one static method with the 
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   312
            same signature due to inheritance, it is confusing when the 
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   313
            method selection depends on the access rights only: 
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   314
            e.g.
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   315
              Class C declares static public method foo().
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   316
              Class D is subclass of C and declares static method foo()
schirmer@12854
   317
              with default package access.
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   318
              D.foo() ? if this call is in the same package as D then
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   319
                        foo of class D is called, otherwise foo of class C.
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   320
      \end{itemize}
schirmer@12854
   321
schirmer@12854
   322
\end{itemize}
schirmer@12854
   323
*}
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   324
(* to Table *)
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   325
constdefs entails:: "('a,'b) table \<Rightarrow> ('b \<Rightarrow> bool) \<Rightarrow> bool"
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   326
                                 ("_ entails _" 20)
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   327
"t entails P \<equiv> \<forall>k. \<forall> x \<in> t k: P x"
schirmer@12854
   328
schirmer@12854
   329
lemma entailsD:
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   330
 "\<lbrakk>t entails P; t k = Some x\<rbrakk> \<Longrightarrow> P x"
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   331
by (simp add: entails_def)
schirmer@12854
   332
schirmer@12854
   333
lemma empty_entails[simp]: "empty entails P"
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   334
by (simp add: entails_def)
schirmer@12854
   335
schirmer@12854
   336
constdefs
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   337
 wf_cdecl :: "prog \<Rightarrow> cdecl \<Rightarrow> bool"
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   338
"wf_cdecl G \<equiv> 
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   339
   \<lambda>(C,c).
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   340
      \<not>is_iface G C \<and>
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   341
      (\<forall>I\<in>set (superIfs c). is_acc_iface G (pid C) I \<and>
schirmer@12854
   342
        (\<forall>s. \<forall> im \<in> imethds G I s.
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   343
      	    (\<exists> cm \<in> methd  G C s: G\<turnstile>resTy cm\<preceq>resTy im \<and>
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   344
      	                             \<not> is_static cm \<and>
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   345
                                     accmodi im \<le> accmodi cm))) \<and>
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   346
      (\<forall>f\<in>set (cfields c). wf_fdecl G (pid C) f) \<and> unique (cfields c) \<and> 
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   347
      (\<forall>m\<in>set (methods c). wf_mdecl G C m) \<and> unique (methods c) \<and>
schirmer@13688
   348
      jumpNestingOkS {} (init c) \<and>
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   349
      (\<exists> A. \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile> {} \<guillemotright>\<langle>init c\<rangle>\<guillemotright> A) \<and>
schirmer@12854
   350
      \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile>(init c)\<Colon>\<surd> \<and> ws_cdecl G C (super c) \<and>
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   351
      (C \<noteq> Object \<longrightarrow> 
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   352
            (is_acc_class G (pid C) (super c) \<and>
schirmer@12854
   353
            (table_of (map (\<lambda> (s,m). (s,C,m)) (methods c)) 
schirmer@12854
   354
             entails (\<lambda> new. \<forall> old sig. 
schirmer@12854
   355
                       (G,sig\<turnstile>new overrides\<^sub>S old 
schirmer@12854
   356
                        \<longrightarrow> (G\<turnstile>resTy new\<preceq>resTy old \<and>
schirmer@12854
   357
                             accmodi old \<le> accmodi new \<and>
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   358
      	                     \<not>is_static old)) \<and>
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   359
                       (G,sig\<turnstile>new hides old 
schirmer@12854
   360
                         \<longrightarrow> (accmodi old \<le> accmodi new \<and>
schirmer@12854
   361
      	                      is_static old)))) 
schirmer@12854
   362
            ))"
schirmer@12854
   363
schirmer@12854
   364
(*
schirmer@12854
   365
constdefs
schirmer@12854
   366
 wf_cdecl :: "prog \<Rightarrow> cdecl \<Rightarrow> bool"
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   367
"wf_cdecl G \<equiv> 
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   368
   \<lambda>(C,c).
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   369
      \<not>is_iface G C \<and>
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   370
      (\<forall>I\<in>set (superIfs c). is_acc_iface G (pid C) I \<and>
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   371
        (\<forall>s. \<forall> im \<in> imethds G I s.
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   372
      	    (\<exists> cm \<in> methd  G C s: G\<turnstile>resTy (mthd cm)\<preceq>resTy (mthd im) \<and>
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   373
      	                             \<not> is_static cm \<and>
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   374
                                     accmodi im \<le> accmodi cm))) \<and>
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   375
      (\<forall>f\<in>set (cfields c). wf_fdecl G (pid C) f) \<and> unique (cfields c) \<and> 
schirmer@12854
   376
      (\<forall>m\<in>set (methods c). wf_mdecl G C m) \<and> unique (methods c) \<and> 
schirmer@12854
   377
      \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile>(init c)\<Colon>\<surd> \<and> ws_cdecl G C (super c) \<and>
schirmer@12854
   378
      (C \<noteq> Object \<longrightarrow> 
schirmer@12854
   379
            (is_acc_class G (pid C) (super c) \<and>
schirmer@12854
   380
            (table_of (map (\<lambda> (s,m). (s,C,m)) (methods c)) 
schirmer@12854
   381
              hiding methd G (super c)
schirmer@12854
   382
              under (\<lambda> new old. G\<turnstile>new overrides old)
schirmer@12854
   383
              entails (\<lambda> new old. 
schirmer@12854
   384
                           (G\<turnstile>resTy (mthd new)\<preceq>resTy (mthd old) \<and>
schirmer@12854
   385
                            accmodi old \<le> accmodi new \<and>
schirmer@12854
   386
      	                   \<not> is_static old)))  \<and>
schirmer@12854
   387
            (table_of (map (\<lambda> (s,m). (s,C,m)) (methods c)) 
schirmer@12854
   388
              hiding methd G (super c)
schirmer@12854
   389
              under (\<lambda> new old. G\<turnstile>new hides old)
schirmer@12854
   390
              entails (\<lambda> new old. is_static old \<and> 
schirmer@12854
   391
                                  accmodi old \<le> accmodi new))  \<and>
schirmer@12854
   392
            (table_of (cfields c) hiding accfield G C (super c)
schirmer@12854
   393
              entails (\<lambda> newF oldF. accmodi oldF \<le> access newF))))"
schirmer@12854
   394
*)
schirmer@12854
   395
schirmer@13688
   396
lemma wf_cdeclE [consumes 1]: 
schirmer@13688
   397
 "\<lbrakk>wf_cdecl G (C,c);
schirmer@13688
   398
   \<lbrakk>\<not>is_iface G C;
schirmer@13688
   399
    (\<forall>I\<in>set (superIfs c). is_acc_iface G (pid C) I \<and>
schirmer@13688
   400
        (\<forall>s. \<forall> im \<in> imethds G I s.
schirmer@13688
   401
      	    (\<exists> cm \<in> methd  G C s: G\<turnstile>resTy cm\<preceq>resTy im \<and>
schirmer@13688
   402
      	                             \<not> is_static cm \<and>
schirmer@13688
   403
                                     accmodi im \<le> accmodi cm))); 
schirmer@13688
   404
      \<forall>f\<in>set (cfields c). wf_fdecl G (pid C) f; unique (cfields c); 
schirmer@13688
   405
      \<forall>m\<in>set (methods c). wf_mdecl G C m; unique (methods c);
schirmer@13688
   406
      jumpNestingOkS {} (init c);
schirmer@13688
   407
      \<exists> A. \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile> {} \<guillemotright>\<langle>init c\<rangle>\<guillemotright> A;
schirmer@13688
   408
      \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile>(init c)\<Colon>\<surd>; 
schirmer@13688
   409
      ws_cdecl G C (super c); 
schirmer@13688
   410
      (C \<noteq> Object \<longrightarrow> 
schirmer@13688
   411
            (is_acc_class G (pid C) (super c) \<and>
schirmer@13688
   412
            (table_of (map (\<lambda> (s,m). (s,C,m)) (methods c)) 
schirmer@13688
   413
             entails (\<lambda> new. \<forall> old sig. 
schirmer@13688
   414
                       (G,sig\<turnstile>new overrides\<^sub>S old 
schirmer@13688
   415
                        \<longrightarrow> (G\<turnstile>resTy new\<preceq>resTy old \<and>
schirmer@13688
   416
                             accmodi old \<le> accmodi new \<and>
schirmer@13688
   417
      	                     \<not>is_static old)) \<and>
schirmer@13688
   418
                       (G,sig\<turnstile>new hides old 
schirmer@13688
   419
                         \<longrightarrow> (accmodi old \<le> accmodi new \<and>
schirmer@13688
   420
      	                      is_static old)))) 
schirmer@13688
   421
            ))\<rbrakk> \<Longrightarrow> P
schirmer@13688
   422
  \<rbrakk> \<Longrightarrow> P"
schirmer@13688
   423
by (unfold wf_cdecl_def) simp
schirmer@13688
   424
schirmer@12854
   425
lemma wf_cdecl_unique: 
schirmer@12854
   426
"wf_cdecl G (C,c) \<Longrightarrow> unique (cfields c) \<and> unique (methods c)"
schirmer@12854
   427
apply (unfold wf_cdecl_def)
schirmer@12854
   428
apply auto
schirmer@12854
   429
done
schirmer@12854
   430
schirmer@12854
   431
lemma wf_cdecl_fdecl: 
schirmer@12854
   432
"\<lbrakk>wf_cdecl G (C,c); f\<in>set (cfields c)\<rbrakk> \<Longrightarrow> wf_fdecl G (pid C) f"
schirmer@12854
   433
apply (unfold wf_cdecl_def)
schirmer@12854
   434
apply auto
schirmer@12854
   435
done
schirmer@12854
   436
schirmer@12854
   437
lemma wf_cdecl_mdecl: 
schirmer@12854
   438
"\<lbrakk>wf_cdecl G (C,c); m\<in>set (methods c)\<rbrakk> \<Longrightarrow> wf_mdecl G C m"
schirmer@12854
   439
apply (unfold wf_cdecl_def)
schirmer@12854
   440
apply auto
schirmer@12854
   441
done
schirmer@12854
   442
schirmer@12854
   443
lemma wf_cdecl_impD: 
schirmer@12854
   444
"\<lbrakk>wf_cdecl G (C,c); I\<in>set (superIfs c)\<rbrakk> 
schirmer@12854
   445
\<Longrightarrow> is_acc_iface G (pid C) I \<and>  
schirmer@12854
   446
    (\<forall>s. \<forall>im \<in> imethds G I s.  
schirmer@12854
   447
        (\<exists>cm \<in> methd G C s: G\<turnstile>resTy cm\<preceq>resTy im \<and> \<not>is_static cm \<and>
schirmer@12854
   448
                                   accmodi im \<le> accmodi cm))"
schirmer@12854
   449
apply (unfold wf_cdecl_def)
schirmer@12854
   450
apply auto
schirmer@12854
   451
done
schirmer@12854
   452
schirmer@12854
   453
lemma wf_cdecl_supD: 
schirmer@12854
   454
"\<lbrakk>wf_cdecl G (C,c); C \<noteq> Object\<rbrakk> \<Longrightarrow>  
schirmer@12854
   455
  is_acc_class G (pid C) (super c) \<and> (super c,C) \<notin> (subcls1 G)^+ \<and> 
schirmer@12854
   456
   (table_of (map (\<lambda> (s,m). (s,C,m)) (methods c)) 
schirmer@12854
   457
    entails (\<lambda> new. \<forall> old sig. 
schirmer@12854
   458
                 (G,sig\<turnstile>new overrides\<^sub>S old 
schirmer@12854
   459
                  \<longrightarrow> (G\<turnstile>resTy new\<preceq>resTy old \<and>
schirmer@12854
   460
                       accmodi old \<le> accmodi new \<and>
schirmer@12854
   461
                       \<not>is_static old)) \<and>
schirmer@12854
   462
                 (G,sig\<turnstile>new hides old 
schirmer@12854
   463
                   \<longrightarrow> (accmodi old \<le> accmodi new \<and>
schirmer@12854
   464
                        is_static old))))"
schirmer@12854
   465
apply (unfold wf_cdecl_def ws_cdecl_def)
schirmer@12854
   466
apply auto
schirmer@12854
   467
done
schirmer@12854
   468
schirmer@12854
   469
schirmer@12854
   470
lemma wf_cdecl_overrides_SomeD:
schirmer@12854
   471
"\<lbrakk>wf_cdecl G (C,c); C \<noteq> Object; table_of (methods c) sig = Some newM;
schirmer@12854
   472
  G,sig\<turnstile>(C,newM) overrides\<^sub>S old
schirmer@12854
   473
\<rbrakk> \<Longrightarrow>  G\<turnstile>resTy newM\<preceq>resTy old \<and>
schirmer@12854
   474
       accmodi old \<le> accmodi newM \<and>
schirmer@12854
   475
       \<not> is_static old" 
schirmer@12854
   476
apply (drule (1) wf_cdecl_supD)
schirmer@12854
   477
apply (clarify)
schirmer@12854
   478
apply (drule entailsD)
schirmer@12854
   479
apply   (blast intro: table_of_map_SomeI)
schirmer@12854
   480
apply (drule_tac x="old" in spec)
schirmer@12854
   481
apply (auto dest: overrides_eq_sigD simp add: msig_def)
schirmer@12854
   482
done
schirmer@12854
   483
schirmer@12854
   484
lemma wf_cdecl_hides_SomeD:
schirmer@12854
   485
"\<lbrakk>wf_cdecl G (C,c); C \<noteq> Object; table_of (methods c) sig = Some newM;
schirmer@12854
   486
  G,sig\<turnstile>(C,newM) hides old
schirmer@12854
   487
\<rbrakk> \<Longrightarrow>  accmodi old \<le> access newM \<and>
schirmer@12854
   488
       is_static old" 
schirmer@12854
   489
apply (drule (1) wf_cdecl_supD)
schirmer@12854
   490
apply (clarify)
schirmer@12854
   491
apply (drule entailsD)
schirmer@12854
   492
apply   (blast intro: table_of_map_SomeI)
schirmer@12854
   493
apply (drule_tac x="old" in spec)
schirmer@12854
   494
apply (auto dest: hides_eq_sigD simp add: msig_def)
schirmer@12854
   495
done
schirmer@12854
   496
schirmer@12854
   497
lemma wf_cdecl_wt_init: 
schirmer@12854
   498
 "wf_cdecl G (C, c) \<Longrightarrow> \<lparr>prg=G,cls=C,lcl=empty\<rparr>\<turnstile>init c\<Colon>\<surd>"
schirmer@12854
   499
apply (unfold wf_cdecl_def)
schirmer@12854
   500
apply auto
schirmer@12854
   501
done
schirmer@12854
   502
schirmer@12854
   503
schirmer@12854
   504
section "well-formed programs"
schirmer@12854
   505
  (* well-formed program, cf. 8.1, 9.1 *)
schirmer@12854
   506
schirmer@12854
   507
text {*
schirmer@12854
   508
A program declaration is wellformed if:
schirmer@12854
   509
\begin{itemize}
schirmer@12854
   510
\item the class ObjectC of Object is defined
schirmer@14030
   511
\item every method of Object has an access modifier distinct from Package. 
schirmer@14030
   512
      This is
schirmer@12854
   513
      necessary since every interface automatically inherits from Object.  
schirmer@12854
   514
      We must know, that every time a Object method is "overriden" by an 
schirmer@12854
   515
      interface method this is also overriden by the class implementing the
schirmer@12854
   516
      the interface (see @{text "implement_dynmethd and class_mheadsD"})
schirmer@12854
   517
\item all standard Exceptions are defined
schirmer@12854
   518
\item all defined interfaces are wellformed
schirmer@12854
   519
\item all defined classes are wellformed
schirmer@12854
   520
\end{itemize}
schirmer@12854
   521
*}
schirmer@12854
   522
constdefs
schirmer@12854
   523
  wf_prog  :: "prog \<Rightarrow> bool"
schirmer@12854
   524
 "wf_prog G \<equiv> let is = ifaces G; cs = classes G in
schirmer@12854
   525
	         ObjectC \<in> set cs \<and> 
schirmer@12854
   526
                (\<forall> m\<in>set Object_mdecls. accmodi m \<noteq> Package) \<and>
schirmer@12854
   527
                (\<forall>xn. SXcptC xn \<in> set cs) \<and>
schirmer@12854
   528
		(\<forall>i\<in>set is. wf_idecl G i) \<and> unique is \<and>
schirmer@12854
   529
		(\<forall>c\<in>set cs. wf_cdecl G c) \<and> unique cs"
schirmer@12854
   530
schirmer@12854
   531
lemma wf_prog_idecl: "\<lbrakk>iface G I = Some i; wf_prog G\<rbrakk> \<Longrightarrow> wf_idecl G (I,i)"
schirmer@12854
   532
apply (unfold wf_prog_def Let_def)
schirmer@12854
   533
apply simp
schirmer@12854
   534
apply (fast dest: map_of_SomeD)
schirmer@12854
   535
done
schirmer@12854
   536
schirmer@12854
   537
lemma wf_prog_cdecl: "\<lbrakk>class G C = Some c; wf_prog G\<rbrakk> \<Longrightarrow> wf_cdecl G (C,c)"
schirmer@12854
   538
apply (unfold wf_prog_def Let_def)
schirmer@12854
   539
apply simp
schirmer@12854
   540
apply (fast dest: map_of_SomeD)
schirmer@12854
   541
done
schirmer@12854
   542
schirmer@12854
   543
lemma wf_prog_Object_mdecls:
schirmer@12854
   544
"wf_prog G \<Longrightarrow> (\<forall> m\<in>set Object_mdecls. accmodi m \<noteq> Package)"
schirmer@12854
   545
apply (unfold wf_prog_def Let_def)
schirmer@12854
   546
apply simp
schirmer@12854
   547
done
schirmer@12854
   548
schirmer@12854
   549
lemma wf_prog_acc_superD:
schirmer@12854
   550
 "\<lbrakk>wf_prog G; class G C = Some c; C \<noteq> Object \<rbrakk> 
schirmer@12854
   551
  \<Longrightarrow> is_acc_class G (pid C) (super c)"
schirmer@12854
   552
by (auto dest: wf_prog_cdecl wf_cdecl_supD)
schirmer@12854
   553
schirmer@12854
   554
lemma wf_ws_prog [elim!,simp]: "wf_prog G \<Longrightarrow> ws_prog G"
schirmer@12854
   555
apply (unfold wf_prog_def Let_def)
schirmer@12854
   556
apply (rule ws_progI)
schirmer@12854
   557
apply  (simp_all (no_asm))
schirmer@12854
   558
apply  (auto simp add: is_acc_class_def is_acc_iface_def 
schirmer@12854
   559
             dest!: wf_idecl_supD wf_cdecl_supD )+
schirmer@12854
   560
done
schirmer@12854
   561
schirmer@12854
   562
lemma class_Object [simp]: 
schirmer@12854
   563
"wf_prog G \<Longrightarrow> 
schirmer@12854
   564
  class G Object = Some \<lparr>access=Public,cfields=[],methods=Object_mdecls,
haftmann@28524
   565
                                  init=Skip,super=undefined,superIfs=[]\<rparr>"
schirmer@12854
   566
apply (unfold wf_prog_def Let_def ObjectC_def)
schirmer@12854
   567
apply (fast dest!: map_of_SomeI)
schirmer@12854
   568
done
schirmer@12854
   569
schirmer@12854
   570
lemma methd_Object[simp]: "wf_prog G \<Longrightarrow> methd G Object =  
schirmer@12854
   571
  table_of (map (\<lambda>(s,m). (s, Object, m)) Object_mdecls)"
schirmer@12854
   572
apply (subst methd_rec)
schirmer@12854
   573
apply (auto simp add: Let_def)
schirmer@12854
   574
done
schirmer@12854
   575
schirmer@12854
   576
lemma wf_prog_Object_methd:
schirmer@12854
   577
"\<lbrakk>wf_prog G; methd G Object sig = Some m\<rbrakk> \<Longrightarrow> accmodi m \<noteq> Package"
schirmer@12854
   578
by (auto dest!: wf_prog_Object_mdecls) (auto dest!: map_of_SomeD) 
schirmer@12854
   579
schirmer@12854
   580
lemma wf_prog_Object_is_public[intro]:
schirmer@12854
   581
 "wf_prog G \<Longrightarrow> is_public G Object"
schirmer@12854
   582
by (auto simp add: is_public_def dest: class_Object)
schirmer@12854
   583
schirmer@12854
   584
lemma class_SXcpt [simp]: 
schirmer@12854
   585
"wf_prog G \<Longrightarrow> 
schirmer@12854
   586
  class G (SXcpt xn) = Some \<lparr>access=Public,cfields=[],methods=SXcpt_mdecls,
schirmer@12854
   587
                                   init=Skip,
schirmer@12854
   588
                                   super=if xn = Throwable then Object 
schirmer@12854
   589
                                                           else SXcpt Throwable,
schirmer@12854
   590
                                   superIfs=[]\<rparr>"
schirmer@12854
   591
apply (unfold wf_prog_def Let_def SXcptC_def)
schirmer@12854
   592
apply (fast dest!: map_of_SomeI)
schirmer@12854
   593
done
schirmer@12854
   594
schirmer@12854
   595
lemma wf_ObjectC [simp]: 
schirmer@12854
   596
	"wf_cdecl G ObjectC = (\<not>is_iface G Object \<and> Ball (set Object_mdecls)
schirmer@12854
   597
  (wf_mdecl G Object) \<and> unique Object_mdecls)"
schirmer@12854
   598
apply (unfold wf_cdecl_def ws_cdecl_def ObjectC_def)
schirmer@13688
   599
apply (auto intro: da.Skip)
schirmer@12854
   600
done
schirmer@12854
   601
schirmer@12854
   602
lemma Object_is_class [simp,elim!]: "wf_prog G \<Longrightarrow> is_class G Object"
schirmer@12854
   603
apply (simp (no_asm_simp))
schirmer@12854
   604
done
schirmer@12854
   605
 
schirmer@12854
   606
lemma Object_is_acc_class [simp,elim!]: "wf_prog G \<Longrightarrow> is_acc_class G S Object"
schirmer@12854
   607
apply (simp (no_asm_simp) add: is_acc_class_def is_public_def
schirmer@12854
   608
                               accessible_in_RefT_simp)
schirmer@12854
   609
done
schirmer@12854
   610
schirmer@12854
   611
lemma SXcpt_is_class [simp,elim!]: "wf_prog G \<Longrightarrow> is_class G (SXcpt xn)"
schirmer@12854
   612
apply (simp (no_asm_simp))
schirmer@12854
   613
done
schirmer@12854
   614
schirmer@12854
   615
lemma SXcpt_is_acc_class [simp,elim!]: 
schirmer@12854
   616
"wf_prog G \<Longrightarrow> is_acc_class G S (SXcpt xn)"
schirmer@12854
   617
apply (simp (no_asm_simp) add: is_acc_class_def is_public_def
schirmer@12854
   618
                               accessible_in_RefT_simp)
schirmer@12854
   619
done
schirmer@12854
   620
schirmer@12854
   621
lemma fields_Object [simp]: "wf_prog G \<Longrightarrow> DeclConcepts.fields G Object = []"
schirmer@12854
   622
by (force intro: fields_emptyI)
schirmer@12854
   623
schirmer@12854
   624
lemma accfield_Object [simp]: 
schirmer@12854
   625
 "wf_prog G \<Longrightarrow> accfield G S Object = empty"
schirmer@12854
   626
apply (unfold accfield_def)
schirmer@12854
   627
apply (simp (no_asm_simp) add: Let_def)
schirmer@12854
   628
done
schirmer@12854
   629
schirmer@12854
   630
lemma fields_Throwable [simp]: 
schirmer@12854
   631
 "wf_prog G \<Longrightarrow> DeclConcepts.fields G (SXcpt Throwable) = []"
schirmer@12854
   632
by (force intro: fields_emptyI)
schirmer@12854
   633
schirmer@12854
   634
lemma fields_SXcpt [simp]: "wf_prog G \<Longrightarrow> DeclConcepts.fields G (SXcpt xn) = []"
schirmer@12854
   635
apply (case_tac "xn = Throwable")
schirmer@12854
   636
apply  (simp (no_asm_simp))
schirmer@12854
   637
by (force intro: fields_emptyI)
schirmer@12854
   638
schirmer@12854
   639
lemmas widen_trans = ws_widen_trans [OF _ _ wf_ws_prog, elim]
schirmer@12854
   640
lemma widen_trans2 [elim]: "\<lbrakk>G\<turnstile>U\<preceq>T; G\<turnstile>S\<preceq>U; wf_prog G\<rbrakk> \<Longrightarrow> G\<turnstile>S\<preceq>T"
schirmer@12854
   641
apply (erule (2) widen_trans)
schirmer@12854
   642
done
schirmer@12854
   643
schirmer@12854
   644
lemma Xcpt_subcls_Throwable [simp]: 
schirmer@12854
   645
"wf_prog G \<Longrightarrow> G\<turnstile>SXcpt xn\<preceq>\<^sub>C SXcpt Throwable"
schirmer@12854
   646
apply (rule SXcpt_subcls_Throwable_lemma)
schirmer@12854
   647
apply auto
schirmer@12854
   648
done
schirmer@12854
   649
schirmer@12854
   650
lemma unique_fields: 
schirmer@12854
   651
 "\<lbrakk>is_class G C; wf_prog G\<rbrakk> \<Longrightarrow> unique (DeclConcepts.fields G C)"
schirmer@12854
   652
apply (erule ws_unique_fields)
schirmer@12854
   653
apply  (erule wf_ws_prog)
schirmer@12854
   654
apply (erule (1) wf_prog_cdecl [THEN wf_cdecl_unique [THEN conjunct1]])
schirmer@12854
   655
done
schirmer@12854
   656
schirmer@12854
   657
lemma fields_mono: 
schirmer@12854
   658
"\<lbrakk>table_of (DeclConcepts.fields G C) fn = Some f; G\<turnstile>D\<preceq>\<^sub>C C; 
schirmer@12854
   659
  is_class G D; wf_prog G\<rbrakk> 
schirmer@12854
   660
   \<Longrightarrow> table_of (DeclConcepts.fields G D) fn = Some f"
schirmer@12854
   661
apply (rule map_of_SomeI)
schirmer@12854
   662
apply  (erule (1) unique_fields)
schirmer@12854
   663
apply (erule (1) map_of_SomeD [THEN fields_mono_lemma])
schirmer@12854
   664
apply (erule wf_ws_prog)
schirmer@12854
   665
done
schirmer@12854
   666
schirmer@12854
   667
schirmer@12854
   668
lemma fields_is_type [elim]: 
schirmer@12854
   669
"\<lbrakk>table_of (DeclConcepts.fields G C) m = Some f; wf_prog G; is_class G C\<rbrakk> \<Longrightarrow> 
schirmer@12854
   670
      is_type G (type f)"
schirmer@12854
   671
apply (frule wf_ws_prog)
schirmer@12854
   672
apply (force dest: fields_declC [THEN conjunct1] 
schirmer@12854
   673
                   wf_prog_cdecl [THEN wf_cdecl_fdecl]
schirmer@12854
   674
             simp add: wf_fdecl_def2 is_acc_type_def)
schirmer@12854
   675
done
schirmer@12854
   676
schirmer@12854
   677
lemma imethds_wf_mhead [rule_format (no_asm)]: 
schirmer@12854
   678
"\<lbrakk>m \<in> imethds G I sig; wf_prog G; is_iface G I\<rbrakk> \<Longrightarrow>  
schirmer@12854
   679
  wf_mhead G (pid (decliface m)) sig (mthd m) \<and> 
schirmer@12854
   680
  \<not> is_static m \<and> accmodi m = Public"
schirmer@12854
   681
apply (frule wf_ws_prog)
schirmer@12854
   682
apply (drule (2) imethds_declI [THEN conjunct1])
schirmer@12854
   683
apply clarify
schirmer@12854
   684
apply (frule_tac I="(decliface m)" in wf_prog_idecl,assumption)
schirmer@12854
   685
apply (drule wf_idecl_mhead)
schirmer@12854
   686
apply (erule map_of_SomeD)
schirmer@12854
   687
apply (cases m, simp)
schirmer@12854
   688
done
schirmer@12854
   689
schirmer@12854
   690
lemma methd_wf_mdecl: 
schirmer@12854
   691
 "\<lbrakk>methd G C sig = Some m; wf_prog G; class G C = Some y\<rbrakk> \<Longrightarrow>  
schirmer@12854
   692
  G\<turnstile>C\<preceq>\<^sub>C (declclass m) \<and> is_class G (declclass m) \<and> 
schirmer@12854
   693
  wf_mdecl G (declclass m) (sig,(mthd m))"
schirmer@12854
   694
apply (frule wf_ws_prog)
schirmer@12854
   695
apply (drule (1) methd_declC)
schirmer@12854
   696
apply  fast
schirmer@12854
   697
apply clarsimp
schirmer@12854
   698
apply (frule (1) wf_prog_cdecl, erule wf_cdecl_mdecl, erule map_of_SomeD)
schirmer@12854
   699
done
schirmer@12854
   700
schirmer@12854
   701
(*
schirmer@12854
   702
This lemma doesn't hold!
schirmer@12854
   703
lemma methd_rT_is_acc_type: 
schirmer@12854
   704
"\<lbrakk>wf_prog G;methd G C C sig = Some (D,m);
schirmer@12854
   705
    class G C = Some y\<rbrakk>
schirmer@12854
   706
\<Longrightarrow> is_acc_type G (pid C) (resTy m)"
schirmer@12854
   707
The result Type is only visible in the scope of defining class D 
schirmer@12854
   708
"is_vis_type G (pid D) (resTy m)" but not necessarily in scope of class C!
schirmer@12854
   709
(The same is true for the type of pramaters of a method)
schirmer@12854
   710
*)
schirmer@12854
   711
schirmer@12854
   712
schirmer@12854
   713
lemma methd_rT_is_type: 
schirmer@12854
   714
"\<lbrakk>wf_prog G;methd G C sig = Some m;
schirmer@12854
   715
    class G C = Some y\<rbrakk>
schirmer@12854
   716
\<Longrightarrow> is_type G (resTy m)"
schirmer@12854
   717
apply (drule (2) methd_wf_mdecl)
schirmer@12854
   718
apply clarify
schirmer@12854
   719
apply (drule wf_mdeclD1)
schirmer@12854
   720
apply clarify
schirmer@12854
   721
apply (drule rT_is_acc_type)
schirmer@12854
   722
apply (cases m, simp add: is_acc_type_def)
schirmer@12854
   723
done
schirmer@12854
   724
schirmer@12854
   725
lemma accmethd_rT_is_type:
schirmer@12854
   726
"\<lbrakk>wf_prog G;accmethd G S C sig = Some m;
schirmer@12854
   727
    class G C = Some y\<rbrakk>
schirmer@12854
   728
\<Longrightarrow> is_type G (resTy m)"
schirmer@12854
   729
by (auto simp add: accmethd_def  
schirmer@12854
   730
         intro: methd_rT_is_type)
schirmer@12854
   731
schirmer@12854
   732
lemma methd_Object_SomeD:
schirmer@12854
   733
"\<lbrakk>wf_prog G;methd G Object sig = Some m\<rbrakk> 
schirmer@12854
   734
 \<Longrightarrow> declclass m = Object"
schirmer@12854
   735
by (auto dest: class_Object simp add: methd_rec )
schirmer@12854
   736
schirmer@12854
   737
lemma wf_imethdsD: 
schirmer@12854
   738
 "\<lbrakk>im \<in> imethds G I sig;wf_prog G; is_iface G I\<rbrakk> 
schirmer@12854
   739
 \<Longrightarrow> \<not>is_static im \<and> accmodi im = Public"
schirmer@12854
   740
proof -
schirmer@12854
   741
  assume asm: "wf_prog G" "is_iface G I" "im \<in> imethds G I sig"
schirmer@12854
   742
  have "wf_prog G \<longrightarrow> 
schirmer@12854
   743
         (\<forall> i im. iface G I = Some i \<longrightarrow> im \<in> imethds G I sig
schirmer@12854
   744
                  \<longrightarrow> \<not>is_static im \<and> accmodi im = Public)" (is "?P G I")
schirmer@12854
   745
  proof (rule iface_rec.induct,intro allI impI)
schirmer@12854
   746
    fix G I i im
schirmer@12854
   747
    assume hyp: "\<forall> J i. J \<in> set (isuperIfs i) \<and> ws_prog G \<and> iface G I = Some i
schirmer@12854
   748
                 \<longrightarrow> ?P G J"
schirmer@12854
   749
    assume wf: "wf_prog G" and if_I: "iface G I = Some i" and 
schirmer@12854
   750
           im: "im \<in> imethds G I sig" 
schirmer@12854
   751
    show "\<not>is_static im \<and> accmodi im = Public" 
schirmer@12854
   752
    proof -
schirmer@12854
   753
      let ?inherited = "Un_tables (imethds G ` set (isuperIfs i))"
nipkow@30235
   754
      let ?new = "(Option.set \<circ> table_of (map (\<lambda>(s, mh). (s, I, mh)) (imethods i)))"
schirmer@12854
   755
      from if_I wf im have imethds:"im \<in> (?inherited \<oplus>\<oplus> ?new) sig"
schirmer@12854
   756
	by (simp add: imethds_rec)
schirmer@12854
   757
      from wf if_I have 
schirmer@12854
   758
	wf_supI: "\<forall> J. J \<in> set (isuperIfs i) \<longrightarrow> (\<exists> j. iface G J = Some j)"
schirmer@12854
   759
	by (blast dest: wf_prog_idecl wf_idecl_supD is_acc_ifaceD)
schirmer@12854
   760
      from wf if_I have
schirmer@12854
   761
	"\<forall> im \<in> set (imethods i). \<not> is_static im \<and> accmodi im = Public"
schirmer@12854
   762
	by (auto dest!: wf_prog_idecl wf_idecl_mhead)
schirmer@12854
   763
      then have new_ok: "\<forall> im. table_of (imethods i) sig = Some im 
schirmer@12854
   764
                         \<longrightarrow>  \<not> is_static im \<and> accmodi im = Public"
schirmer@12854
   765
	by (auto dest!: table_of_Some_in_set)
schirmer@12854
   766
      show ?thesis
schirmer@12854
   767
	proof (cases "?new sig = {}")
schirmer@12854
   768
	  case True
schirmer@12854
   769
	  from True wf wf_supI if_I imethds hyp 
schirmer@12854
   770
	  show ?thesis by (auto simp del:  split_paired_All)  
schirmer@12854
   771
	next
schirmer@12854
   772
	  case False
schirmer@12854
   773
	  from False wf wf_supI if_I imethds new_ok hyp 
schirmer@12854
   774
	  show ?thesis by (auto dest: wf_idecl_hidings hidings_entailsD)
schirmer@12854
   775
	qed
schirmer@12854
   776
      qed
schirmer@12854
   777
    qed
schirmer@12854
   778
  with asm show ?thesis by (auto simp del: split_paired_All)
schirmer@12854
   779
qed
schirmer@12854
   780
schirmer@12854
   781
lemma wf_prog_hidesD:
wenzelm@12937
   782
  assumes hides: "G \<turnstile>new hides old" and wf: "wf_prog G"
wenzelm@12937
   783
  shows
schirmer@12854
   784
   "accmodi old \<le> accmodi new \<and>
schirmer@12854
   785
    is_static old"
schirmer@12854
   786
proof -
schirmer@12854
   787
  from hides 
schirmer@12854
   788
  obtain c where 
schirmer@12854
   789
    clsNew: "class G (declclass new) = Some c" and
schirmer@12854
   790
    neqObj: "declclass new \<noteq> Object"
schirmer@12854
   791
    by (auto dest: hidesD declared_in_classD)
schirmer@12854
   792
  with hides obtain newM oldM where
schirmer@12854
   793
    newM: "table_of (methods c) (msig new) = Some newM" and 
schirmer@12854
   794
     new: "new = (declclass new,(msig new),newM)" and
schirmer@12854
   795
     old: "old = (declclass old,(msig old),oldM)" and
schirmer@12854
   796
          "msig new = msig old"
schirmer@12854
   797
    by (cases new,cases old) 
schirmer@12854
   798
       (auto dest: hidesD 
schirmer@12854
   799
         simp add: cdeclaredmethd_def declared_in_def)
schirmer@12854
   800
  with hides 
schirmer@12854
   801
  have hides':
schirmer@12854
   802
        "G,(msig new)\<turnstile>(declclass new,newM) hides (declclass old,oldM)"
schirmer@12854
   803
    by auto
schirmer@12854
   804
  from clsNew wf 
schirmer@12854
   805
  have "wf_cdecl G (declclass new,c)" by (blast intro: wf_prog_cdecl)
schirmer@12854
   806
  note wf_cdecl_hides_SomeD [OF this neqObj newM hides']
schirmer@12854
   807
  with new old 
schirmer@12854
   808
  show ?thesis
schirmer@12854
   809
    by (cases new, cases old) auto
schirmer@12854
   810
qed
schirmer@12854
   811
schirmer@12854
   812
text {* Compare this lemma about static  
schirmer@12854
   813
overriding @{term "G \<turnstile>new overrides\<^sub>S old"} with the definition of 
schirmer@12854
   814
dynamic overriding @{term "G \<turnstile>new overrides old"}. 
schirmer@12854
   815
Conforming result types and restrictions on the access modifiers of the old 
schirmer@12854
   816
and the new method are not part of the predicate for static overriding. But
schirmer@12854
   817
they are enshured in a wellfromed program.  Dynamic overriding has 
schirmer@12854
   818
no restrictions on the access modifiers but enforces confrom result types 
schirmer@12854
   819
as precondition. But with some efford we can guarantee the access modifier
schirmer@12854
   820
restriction for dynamic overriding, too. See lemma 
schirmer@12854
   821
@{text wf_prog_dyn_override_prop}.
schirmer@12854
   822
*}
schirmer@12854
   823
lemma wf_prog_stat_overridesD:
wenzelm@12937
   824
  assumes stat_override: "G \<turnstile>new overrides\<^sub>S old" and wf: "wf_prog G"
wenzelm@12937
   825
  shows
schirmer@12854
   826
   "G\<turnstile>resTy new\<preceq>resTy old \<and>
schirmer@12854
   827
    accmodi old \<le> accmodi new \<and>
schirmer@12854
   828
    \<not> is_static old"
schirmer@12854
   829
proof -
schirmer@12854
   830
  from stat_override 
schirmer@12854
   831
  obtain c where 
schirmer@12854
   832
    clsNew: "class G (declclass new) = Some c" and
schirmer@12854
   833
    neqObj: "declclass new \<noteq> Object"
schirmer@12854
   834
    by (auto dest: stat_overrides_commonD declared_in_classD)
schirmer@12854
   835
  with stat_override obtain newM oldM where
schirmer@12854
   836
    newM: "table_of (methods c) (msig new) = Some newM" and 
schirmer@12854
   837
     new: "new = (declclass new,(msig new),newM)" and
schirmer@12854
   838
     old: "old = (declclass old,(msig old),oldM)" and
schirmer@12854
   839
          "msig new = msig old"
schirmer@12854
   840
    by (cases new,cases old) 
schirmer@12854
   841
       (auto dest: stat_overrides_commonD 
schirmer@12854
   842
         simp add: cdeclaredmethd_def declared_in_def)
schirmer@12854
   843
  with stat_override 
schirmer@12854
   844
  have stat_override':
schirmer@12854
   845
        "G,(msig new)\<turnstile>(declclass new,newM) overrides\<^sub>S (declclass old,oldM)"
schirmer@12854
   846
    by auto
schirmer@12854
   847
  from clsNew wf 
schirmer@12854
   848
  have "wf_cdecl G (declclass new,c)" by (blast intro: wf_prog_cdecl)
schirmer@12854
   849
  note wf_cdecl_overrides_SomeD [OF this neqObj newM stat_override']
schirmer@12854
   850
  with new old 
schirmer@12854
   851
  show ?thesis
schirmer@12854
   852
    by (cases new, cases old) auto
schirmer@12854
   853
qed
schirmer@12854
   854
    
schirmer@12854
   855
lemma static_to_dynamic_overriding: 
wenzelm@12937
   856
  assumes stat_override: "G\<turnstile>new overrides\<^sub>S old" and wf : "wf_prog G"
wenzelm@12937
   857
  shows "G\<turnstile>new overrides old"
schirmer@12854
   858
proof -
schirmer@12854
   859
  from stat_override 
schirmer@12854
   860
  show ?thesis (is "?Overrides new old")
schirmer@12854
   861
  proof (induct)
schirmer@12854
   862
    case (Direct new old superNew)
schirmer@12854
   863
    then have stat_override:"G\<turnstile>new overrides\<^sub>S old" 
schirmer@12854
   864
      by (rule stat_overridesR.Direct)
schirmer@12854
   865
    from stat_override wf
schirmer@12854
   866
    have resTy_widen: "G\<turnstile>resTy new\<preceq>resTy old" and
schirmer@12854
   867
      not_static_old: "\<not> is_static old" 
schirmer@12854
   868
      by (auto dest: wf_prog_stat_overridesD)  
schirmer@12854
   869
    have not_private_new: "accmodi new \<noteq> Private"
schirmer@12854
   870
    proof -
schirmer@12854
   871
      from stat_override 
schirmer@12854
   872
      have "accmodi old \<noteq> Private"
schirmer@12854
   873
	by (rule no_Private_stat_override)
schirmer@12854
   874
      moreover
schirmer@12854
   875
      from stat_override wf
schirmer@12854
   876
      have "accmodi old \<le> accmodi new"
schirmer@12854
   877
	by (auto dest: wf_prog_stat_overridesD)
schirmer@12854
   878
      ultimately
schirmer@12854
   879
      show ?thesis
schirmer@12854
   880
	by (auto dest: acc_modi_bottom)
schirmer@12854
   881
    qed
schirmer@12854
   882
    with Direct resTy_widen not_static_old 
schirmer@12854
   883
    show "?Overrides new old" 
schirmer@12962
   884
      by (auto intro: overridesR.Direct stat_override_declclasses_relation) 
schirmer@12854
   885
  next
berghofe@21765
   886
    case (Indirect new inter old)
schirmer@12854
   887
    then show "?Overrides new old" 
schirmer@12854
   888
      by (blast intro: overridesR.Indirect) 
schirmer@12854
   889
  qed
schirmer@12854
   890
qed
schirmer@12854
   891
schirmer@12854
   892
lemma non_Package_instance_method_inheritance:
wenzelm@12937
   893
  assumes old_inheritable: "G\<turnstile>Method old inheritable_in (pid C)" and
wenzelm@12937
   894
              accmodi_old: "accmodi old \<noteq> Package" and 
wenzelm@12937
   895
          instance_method: "\<not> is_static old" and
wenzelm@12937
   896
                   subcls: "G\<turnstile>C \<prec>\<^sub>C declclass old" and
wenzelm@12937
   897
             old_declared: "G\<turnstile>Method old declared_in (declclass old)" and
wenzelm@12937
   898
                       wf: "wf_prog G"
wenzelm@12937
   899
  shows "G\<turnstile>Method old member_of C \<or>
wenzelm@12937
   900
   (\<exists> new. G\<turnstile> new overrides\<^sub>S old \<and> G\<turnstile>Method new member_of C)"
schirmer@12854
   901
proof -
schirmer@12854
   902
  from wf have ws: "ws_prog G" by auto
schirmer@12854
   903
  from old_declared have iscls_declC_old: "is_class G (declclass old)"
schirmer@12854
   904
    by (auto simp add: declared_in_def cdeclaredmethd_def)
schirmer@12854
   905
  from subcls have  iscls_C: "is_class G C"
schirmer@12854
   906
    by (blast dest:  subcls_is_class)
schirmer@12854
   907
  from iscls_C ws old_inheritable subcls 
schirmer@12854
   908
  show ?thesis (is "?P C old")
schirmer@12854
   909
  proof (induct rule: ws_class_induct')
schirmer@12854
   910
    case Object
schirmer@12854
   911
    assume "G\<turnstile>Object\<prec>\<^sub>C declclass old"
schirmer@12854
   912
    then show "?P Object old"
schirmer@12854
   913
      by blast
schirmer@12854
   914
  next
schirmer@12854
   915
    case (Subcls C c)
schirmer@12854
   916
    assume cls_C: "class G C = Some c" and 
schirmer@12854
   917
       neq_C_Obj: "C \<noteq> Object" and
schirmer@12854
   918
             hyp: "\<lbrakk>G \<turnstile>Method old inheritable_in pid (super c); 
schirmer@12854
   919
                   G\<turnstile>super c\<prec>\<^sub>C declclass old\<rbrakk> \<Longrightarrow> ?P (super c) old" and
schirmer@12854
   920
     inheritable: "G \<turnstile>Method old inheritable_in pid C" and
schirmer@12854
   921
         subclsC: "G\<turnstile>C\<prec>\<^sub>C declclass old"
schirmer@12854
   922
    from cls_C neq_C_Obj  
schirmer@12854
   923
    have super: "G\<turnstile>C \<prec>\<^sub>C\<^sub>1 super c" 
schirmer@12854
   924
      by (rule subcls1I)
schirmer@12854
   925
    from wf cls_C neq_C_Obj
schirmer@12854
   926
    have accessible_super: "G\<turnstile>(Class (super c)) accessible_in (pid C)" 
schirmer@12854
   927
      by (auto dest: wf_prog_cdecl wf_cdecl_supD is_acc_classD)
schirmer@12854
   928
    {
schirmer@12854
   929
      fix old
schirmer@12854
   930
      assume    member_super: "G\<turnstile>Method old member_of (super c)"
schirmer@12854
   931
      assume     inheritable: "G \<turnstile>Method old inheritable_in pid C"
schirmer@12854
   932
      assume instance_method: "\<not> is_static old"
schirmer@12854
   933
      from member_super
schirmer@12854
   934
      have old_declared: "G\<turnstile>Method old declared_in (declclass old)"
schirmer@12854
   935
       by (cases old) (auto dest: member_of_declC)
schirmer@12854
   936
      have "?P C old"
schirmer@12854
   937
      proof (cases "G\<turnstile>mid (msig old) undeclared_in C")
schirmer@12854
   938
	case True
schirmer@12854
   939
	with inheritable super accessible_super member_super
schirmer@12854
   940
	have "G\<turnstile>Method old member_of C"
schirmer@12854
   941
	  by (cases old) (auto intro: members.Inherited)
schirmer@12854
   942
	then show ?thesis
schirmer@12854
   943
	  by auto
schirmer@12854
   944
      next
schirmer@12854
   945
	case False
schirmer@12854
   946
	then obtain new_member where
schirmer@12854
   947
	     "G\<turnstile>new_member declared_in C" and
schirmer@12854
   948
             "mid (msig old) = memberid new_member"
schirmer@12854
   949
          by (auto dest: not_undeclared_declared)
schirmer@12854
   950
	then obtain new where
schirmer@12854
   951
	          new: "G\<turnstile>Method new declared_in C" and
schirmer@12854
   952
               eq_sig: "msig old = msig new" and
schirmer@12854
   953
	    declC_new: "declclass new = C" 
schirmer@12854
   954
	  by (cases new_member) auto
schirmer@12854
   955
	then have member_new: "G\<turnstile>Method new member_of C"
schirmer@12854
   956
	  by (cases new) (auto intro: members.Immediate)
schirmer@12854
   957
	from declC_new super member_super
schirmer@12854
   958
	have subcls_new_old: "G\<turnstile>declclass new \<prec>\<^sub>C declclass old"
schirmer@12854
   959
	  by (auto dest!: member_of_subclseq_declC
schirmer@12854
   960
	            dest: r_into_trancl intro: trancl_rtrancl_trancl)
schirmer@12854
   961
	show ?thesis
schirmer@12854
   962
	proof (cases "is_static new")
schirmer@12854
   963
	  case False
schirmer@12854
   964
	  with eq_sig declC_new new old_declared inheritable
schirmer@12854
   965
	       super member_super subcls_new_old
schirmer@12854
   966
	  have "G\<turnstile>new overrides\<^sub>S old"
schirmer@12854
   967
	    by (auto intro!: stat_overridesR.Direct)
schirmer@12854
   968
	  with member_new show ?thesis
schirmer@12854
   969
	    by blast
schirmer@12854
   970
	next
schirmer@12854
   971
	  case True
schirmer@12854
   972
	  with eq_sig declC_new subcls_new_old new old_declared inheritable
schirmer@12854
   973
	  have "G\<turnstile>new hides old"
schirmer@12854
   974
	    by (auto intro: hidesI)    
schirmer@12854
   975
	  with wf 
schirmer@12854
   976
	  have "is_static old"
schirmer@12854
   977
	    by (blast dest: wf_prog_hidesD)
schirmer@12854
   978
	  with instance_method
schirmer@12854
   979
	  show ?thesis
schirmer@12854
   980
	    by (contradiction)
schirmer@12854
   981
	qed
schirmer@12854
   982
      qed
schirmer@12854
   983
    } note hyp_member_super = this
schirmer@12854
   984
    from subclsC cls_C 
schirmer@12854
   985
    have "G\<turnstile>(super c)\<preceq>\<^sub>C declclass old"
schirmer@12854
   986
      by (rule subcls_superD)
schirmer@12854
   987
    then
schirmer@12854
   988
    show "?P C old"
schirmer@12854
   989
    proof (cases rule: subclseq_cases) 
schirmer@12854
   990
      case Eq
schirmer@12854
   991
      assume "super c = declclass old"
schirmer@12854
   992
      with old_declared 
schirmer@12854
   993
      have "G\<turnstile>Method old member_of (super c)" 
schirmer@12854
   994
	by (cases old) (auto intro: members.Immediate)
schirmer@12854
   995
      with inheritable instance_method 
schirmer@12854
   996
      show ?thesis
schirmer@12854
   997
	by (blast dest: hyp_member_super)
schirmer@12854
   998
    next
schirmer@12854
   999
      case Subcls
schirmer@12854
  1000
      assume "G\<turnstile>super c\<prec>\<^sub>C declclass old"
schirmer@12854
  1001
      moreover
schirmer@12854
  1002
      from inheritable accmodi_old
schirmer@12854
  1003
      have "G \<turnstile>Method old inheritable_in pid (super c)"
schirmer@12854
  1004
	by (cases "accmodi old") (auto simp add: inheritable_in_def)
schirmer@12854
  1005
      ultimately
schirmer@12854
  1006
      have "?P (super c) old"
schirmer@12854
  1007
	by (blast dest: hyp)
schirmer@12854
  1008
      then show ?thesis
schirmer@12854
  1009
      proof
schirmer@12854
  1010
	assume "G \<turnstile>Method old member_of super c"
schirmer@12854
  1011
	with inheritable instance_method
schirmer@12854
  1012
	show ?thesis
schirmer@12854
  1013
	  by (blast dest: hyp_member_super)
schirmer@12854
  1014
      next
schirmer@12854
  1015
	assume "\<exists>new. G \<turnstile> new overrides\<^sub>S old \<and> G \<turnstile>Method new member_of super c"
schirmer@12854
  1016
	then obtain super_new where
schirmer@12854
  1017
	  super_new_override:  "G \<turnstile> super_new overrides\<^sub>S old" and
schirmer@12854
  1018
            super_new_member:  "G \<turnstile>Method super_new member_of super c"
schirmer@12854
  1019
	  by blast
schirmer@12854
  1020
	from super_new_override wf
schirmer@12854
  1021
	have "accmodi old \<le> accmodi super_new"
schirmer@12854
  1022
	  by (auto dest: wf_prog_stat_overridesD)
schirmer@12854
  1023
	with inheritable accmodi_old
schirmer@12854
  1024
	have "G \<turnstile>Method super_new inheritable_in pid C"
schirmer@12854
  1025
	  by (auto simp add: inheritable_in_def 
schirmer@12854
  1026
	              split: acc_modi.splits
schirmer@12854
  1027
                       dest: acc_modi_le_Dests)
schirmer@12854
  1028
	moreover
schirmer@12854
  1029
	from super_new_override 
schirmer@12854
  1030
	have "\<not> is_static super_new"
schirmer@12854
  1031
	  by (auto dest: stat_overrides_commonD)
schirmer@12854
  1032
	moreover
schirmer@12854
  1033
	note super_new_member
schirmer@12854
  1034
	ultimately have "?P C super_new"
schirmer@12854
  1035
	  by (auto dest: hyp_member_super)
schirmer@12854
  1036
	then show ?thesis
schirmer@12854
  1037
	proof 
schirmer@12854
  1038
	  assume "G \<turnstile>Method super_new member_of C"
schirmer@12854
  1039
	  with super_new_override
schirmer@12854
  1040
	  show ?thesis
schirmer@12854
  1041
	    by blast
schirmer@12854
  1042
	next
schirmer@12854
  1043
	  assume "\<exists>new. G \<turnstile> new overrides\<^sub>S super_new \<and> 
schirmer@12854
  1044
                  G \<turnstile>Method new member_of C"
schirmer@12854
  1045
	  with super_new_override show ?thesis
schirmer@12854
  1046
	    by (blast intro: stat_overridesR.Indirect) 
schirmer@12854
  1047
	qed
schirmer@12854
  1048
      qed
schirmer@12854
  1049
    qed
schirmer@12854
  1050
  qed
schirmer@12854
  1051
qed
schirmer@12854
  1052
schirmer@12854
  1053
lemma non_Package_instance_method_inheritance_cases [consumes 6,
schirmer@12854
  1054
         case_names Inheritance Overriding]:
wenzelm@12937
  1055
  assumes old_inheritable: "G\<turnstile>Method old inheritable_in (pid C)" and
wenzelm@12937
  1056
              accmodi_old: "accmodi old \<noteq> Package" and 
wenzelm@12937
  1057
          instance_method: "\<not> is_static old" and
wenzelm@12937
  1058
                   subcls: "G\<turnstile>C \<prec>\<^sub>C declclass old" and
wenzelm@12937
  1059
             old_declared: "G\<turnstile>Method old declared_in (declclass old)" and
wenzelm@12937
  1060
                       wf: "wf_prog G" and
wenzelm@12937
  1061
              inheritance: "G\<turnstile>Method old member_of C \<Longrightarrow> P" and
wenzelm@12937
  1062
               overriding: "\<And> new.
schirmer@12854
  1063
                           \<lbrakk>G\<turnstile> new overrides\<^sub>S old;G\<turnstile>Method new member_of C\<rbrakk>
schirmer@12854
  1064
                           \<Longrightarrow> P"
wenzelm@12937
  1065
  shows P
schirmer@12854
  1066
proof -
schirmer@12854
  1067
  from old_inheritable accmodi_old instance_method subcls old_declared wf 
schirmer@12854
  1068
       inheritance overriding
schirmer@12854
  1069
  show ?thesis
schirmer@12854
  1070
    by (auto dest: non_Package_instance_method_inheritance)
schirmer@12854
  1071
qed
schirmer@12854
  1072
schirmer@12854
  1073
lemma dynamic_to_static_overriding:
wenzelm@12937
  1074
  assumes dyn_override: "G\<turnstile> new overrides old" and
wenzelm@12937
  1075
           accmodi_old: "accmodi old \<noteq> Package" and
wenzelm@12937
  1076
                    wf: "wf_prog G"
wenzelm@12937
  1077
  shows "G\<turnstile> new overrides\<^sub>S old"  
schirmer@12854
  1078
proof - 
schirmer@12854
  1079
  from dyn_override accmodi_old
schirmer@12854
  1080
  show ?thesis (is "?Overrides new old")
schirmer@12854
  1081
  proof (induct rule: overridesR.induct)
schirmer@12854
  1082
    case (Direct new old)
schirmer@12854
  1083
    assume   new_declared: "G\<turnstile>Method new declared_in declclass new"
schirmer@12854
  1084
    assume eq_sig_new_old: "msig new = msig old"
schirmer@12854
  1085
    assume subcls_new_old: "G\<turnstile>declclass new \<prec>\<^sub>C declclass old"
schirmer@12854
  1086
    assume "G \<turnstile>Method old inheritable_in pid (declclass new)" and
schirmer@12854
  1087
           "accmodi old \<noteq> Package" and
schirmer@12854
  1088
           "\<not> is_static old" and
schirmer@12854
  1089
           "G\<turnstile>declclass new\<prec>\<^sub>C declclass old" and
schirmer@12854
  1090
           "G\<turnstile>Method old declared_in declclass old" 
schirmer@12854
  1091
    from this wf
schirmer@12854
  1092
    show "?Overrides new old"
schirmer@12854
  1093
    proof (cases rule: non_Package_instance_method_inheritance_cases)
schirmer@12854
  1094
      case Inheritance
schirmer@12854
  1095
      assume "G \<turnstile>Method old member_of declclass new"
schirmer@12854
  1096
      then have "G\<turnstile>mid (msig old) undeclared_in declclass new"
schirmer@12854
  1097
      proof cases
schirmer@12854
  1098
	case Immediate 
schirmer@12854
  1099
	with subcls_new_old wf show ?thesis 	
schirmer@12854
  1100
	  by (auto dest: subcls_irrefl)
schirmer@12854
  1101
      next
schirmer@12854
  1102
	case Inherited
schirmer@12854
  1103
	then show ?thesis
schirmer@12854
  1104
	  by (cases old) auto
schirmer@12854
  1105
      qed
schirmer@12854
  1106
      with eq_sig_new_old new_declared
schirmer@12854
  1107
      show ?thesis
schirmer@12854
  1108
	by (cases old,cases new) (auto dest!: declared_not_undeclared)
schirmer@12854
  1109
    next
schirmer@12854
  1110
      case (Overriding new') 
schirmer@12854
  1111
      assume stat_override_new': "G \<turnstile> new' overrides\<^sub>S old"
schirmer@12854
  1112
      then have "msig new' = msig old"
schirmer@12854
  1113
	by (auto dest: stat_overrides_commonD)
schirmer@12854
  1114
      with eq_sig_new_old have eq_sig_new_new': "msig new=msig new'"
schirmer@12854
  1115
	by simp
schirmer@12854
  1116
      assume "G \<turnstile>Method new' member_of declclass new"
schirmer@12854
  1117
      then show ?thesis
schirmer@12854
  1118
      proof (cases)
schirmer@12854
  1119
	case Immediate
schirmer@12854
  1120
	then have declC_new: "declclass new' = declclass new" 
schirmer@12854
  1121
	  by auto
schirmer@12854
  1122
	from Immediate 
schirmer@12854
  1123
	have "G\<turnstile>Method new' declared_in declclass new"
schirmer@12854
  1124
	  by (cases new') auto
schirmer@12854
  1125
	with new_declared eq_sig_new_new' declC_new 
schirmer@12854
  1126
	have "new=new'"
schirmer@12854
  1127
	  by (cases new, cases new') (auto dest: unique_declared_in) 
schirmer@12854
  1128
	with stat_override_new'
schirmer@12854
  1129
	show ?thesis
schirmer@12854
  1130
	  by simp
schirmer@12854
  1131
      next
schirmer@12854
  1132
	case Inherited
schirmer@12854
  1133
	then have "G\<turnstile>mid (msig new') undeclared_in declclass new"
schirmer@12854
  1134
	  by (cases new') (auto)
schirmer@12854
  1135
	with eq_sig_new_new' new_declared
schirmer@12854
  1136
	show ?thesis
schirmer@12854
  1137
	  by (cases new,cases new') (auto dest!: declared_not_undeclared)
schirmer@12854
  1138
      qed
schirmer@12854
  1139
    qed
schirmer@12854
  1140
  next
berghofe@21765
  1141
    case (Indirect new inter old)
schirmer@12854
  1142
    assume accmodi_old: "accmodi old \<noteq> Package"
schirmer@12854
  1143
    assume "accmodi old \<noteq> Package \<Longrightarrow> G \<turnstile> inter overrides\<^sub>S old"
schirmer@12854
  1144
    with accmodi_old 
schirmer@12854
  1145
    have stat_override_inter_old: "G \<turnstile> inter overrides\<^sub>S old"
schirmer@12854
  1146
      by blast
schirmer@12854
  1147
    moreover 
schirmer@12854
  1148
    assume hyp_inter: "accmodi inter \<noteq> Package \<Longrightarrow> G \<turnstile> new overrides\<^sub>S inter"
schirmer@12854
  1149
    moreover
schirmer@12854
  1150
    have "accmodi inter \<noteq> Package"
schirmer@12854
  1151
    proof -
schirmer@12854
  1152
      from stat_override_inter_old wf 
schirmer@12854
  1153
      have "accmodi old \<le> accmodi inter"
schirmer@12854
  1154
	by (auto dest: wf_prog_stat_overridesD)
schirmer@12854
  1155
      with stat_override_inter_old accmodi_old
schirmer@12854
  1156
      show ?thesis
schirmer@12854
  1157
	by (auto dest!: no_Private_stat_override
schirmer@12854
  1158
                 split: acc_modi.splits 
schirmer@12854
  1159
	         dest: acc_modi_le_Dests)
schirmer@12854
  1160
    qed
schirmer@12854
  1161
    ultimately show "?Overrides new old"
schirmer@12854
  1162
      by (blast intro: stat_overridesR.Indirect)
schirmer@12854
  1163
  qed
schirmer@12854
  1164
qed
schirmer@12854
  1165
schirmer@12854
  1166
lemma wf_prog_dyn_override_prop:
wenzelm@12937
  1167
  assumes dyn_override: "G \<turnstile> new overrides old" and
schirmer@12854
  1168
                    wf: "wf_prog G"
wenzelm@12937
  1169
  shows "accmodi old \<le> accmodi new"
schirmer@12854
  1170
proof (cases "accmodi old = Package")
schirmer@12854
  1171
  case True
schirmer@12854
  1172
  note old_Package = this
schirmer@12854
  1173
  show ?thesis
schirmer@12854
  1174
  proof (cases "accmodi old \<le> accmodi new")
schirmer@12854
  1175
    case True then show ?thesis .
schirmer@12854
  1176
  next
schirmer@12854
  1177
    case False
schirmer@12854
  1178
    with old_Package 
schirmer@12854
  1179
    have "accmodi new = Private"
schirmer@12854
  1180
      by (cases "accmodi new") (auto simp add: le_acc_def less_acc_def)
schirmer@12854
  1181
    with dyn_override 
schirmer@12854
  1182
    show ?thesis
schirmer@12854
  1183
      by (auto dest: overrides_commonD)
schirmer@12854
  1184
  qed    
schirmer@12854
  1185
next
schirmer@12854
  1186
  case False
schirmer@12854
  1187
  with dyn_override wf
schirmer@12854
  1188
  have "G \<turnstile> new overrides\<^sub>S old"
schirmer@12854
  1189
    by (blast intro: dynamic_to_static_overriding)
schirmer@12854
  1190
  with wf 
schirmer@12854
  1191
  show ?thesis
schirmer@12854
  1192
   by (blast dest: wf_prog_stat_overridesD)
schirmer@12854
  1193
qed 
schirmer@12854
  1194
schirmer@12854
  1195
lemma overrides_Package_old: 
wenzelm@12937
  1196
  assumes dyn_override: "G \<turnstile> new overrides old" and 
wenzelm@12937
  1197
           accmodi_new: "accmodi new = Package" and
wenzelm@12937
  1198
                    wf: "wf_prog G "
wenzelm@12937
  1199
  shows "accmodi old = Package"
schirmer@12854
  1200
proof (cases "accmodi old")
schirmer@12854
  1201
  case Private
schirmer@12854
  1202
  with dyn_override show ?thesis
schirmer@12854
  1203
    by (simp add: no_Private_override)
schirmer@12854
  1204
next
schirmer@12854
  1205
  case Package
schirmer@12854
  1206
  then show ?thesis .
schirmer@12854
  1207
next
schirmer@12854
  1208
  case Protected
schirmer@12854
  1209
  with dyn_override wf
schirmer@12854
  1210
  have "G \<turnstile> new overrides\<^sub>S old"
schirmer@12854
  1211
    by (auto intro: dynamic_to_static_overriding)
schirmer@12854
  1212
  with wf 
schirmer@12854
  1213
  have "accmodi old \<le> accmodi new"
schirmer@12854
  1214
    by (auto dest: wf_prog_stat_overridesD)
schirmer@12854
  1215
  with Protected accmodi_new
schirmer@12854
  1216
  show ?thesis
schirmer@12854
  1217
    by (simp add: less_acc_def le_acc_def)
schirmer@12854
  1218
next
schirmer@12854
  1219
  case Public
schirmer@12854
  1220
  with dyn_override wf
schirmer@12854
  1221
  have "G \<turnstile> new overrides\<^sub>S old"
schirmer@12854
  1222
    by (auto intro: dynamic_to_static_overriding)
schirmer@12854
  1223
  with wf 
schirmer@12854
  1224
  have "accmodi old \<le> accmodi new"
schirmer@12854
  1225
    by (auto dest: wf_prog_stat_overridesD)
schirmer@12854
  1226
  with Public accmodi_new
schirmer@12854
  1227
  show ?thesis
schirmer@12854
  1228
    by (simp add: less_acc_def le_acc_def)
schirmer@12854
  1229
qed
schirmer@12854
  1230
schirmer@12854
  1231
lemma dyn_override_Package:
wenzelm@12937
  1232
  assumes dyn_override: "G \<turnstile> new overrides old" and
wenzelm@12937
  1233
           accmodi_old: "accmodi old = Package" and 
wenzelm@12937
  1234
           accmodi_new: "accmodi new = Package" and
schirmer@12854
  1235
                    wf: "wf_prog G"
wenzelm@12937
  1236
  shows "pid (declclass old) = pid (declclass new)"
schirmer@12854
  1237
proof - 
schirmer@12854
  1238
  from dyn_override accmodi_old accmodi_new
schirmer@12854
  1239
  show ?thesis (is "?EqPid old new")
schirmer@12854
  1240
  proof (induct rule: overridesR.induct)
schirmer@12854
  1241
    case (Direct new old)
schirmer@12854
  1242
    assume "accmodi old = Package"
schirmer@12854
  1243
           "G \<turnstile>Method old inheritable_in pid (declclass new)"
schirmer@12854
  1244
    then show "pid (declclass old) =  pid (declclass new)"
schirmer@12854
  1245
      by (auto simp add: inheritable_in_def)
schirmer@12854
  1246
  next
berghofe@21765
  1247
    case (Indirect new inter old)
schirmer@12854
  1248
    assume accmodi_old: "accmodi old = Package" and
schirmer@12854
  1249
           accmodi_new: "accmodi new = Package" 
schirmer@12854
  1250
    assume "G \<turnstile> new overrides inter"
schirmer@12854
  1251
    with accmodi_new wf
schirmer@12854
  1252
    have "accmodi inter = Package"
schirmer@12854
  1253
      by  (auto intro: overrides_Package_old)
schirmer@12854
  1254
    with Indirect
schirmer@12854
  1255
    show "pid (declclass old) =  pid (declclass new)"
schirmer@12854
  1256
      by auto
schirmer@12854
  1257
  qed
schirmer@12854
  1258
qed
schirmer@12854
  1259
schirmer@12854
  1260
lemma dyn_override_Package_escape:
wenzelm@12937
  1261
  assumes dyn_override: "G \<turnstile> new overrides old" and
wenzelm@12937
  1262
           accmodi_old: "accmodi old = Package" and 
wenzelm@12937
  1263
          outside_pack: "pid (declclass old) \<noteq> pid (declclass new)" and
schirmer@12854
  1264
                    wf: "wf_prog G"
wenzelm@12937
  1265
  shows "\<exists> inter. G \<turnstile> new overrides inter \<and> G \<turnstile> inter overrides old \<and>
schirmer@12854
  1266
             pid (declclass old) = pid (declclass inter) \<and>
schirmer@12854
  1267
             Protected \<le> accmodi inter"
schirmer@12854
  1268
proof -
schirmer@12854
  1269
  from dyn_override accmodi_old outside_pack
schirmer@12854
  1270
  show ?thesis (is "?P new old")
schirmer@12854
  1271
  proof (induct rule: overridesR.induct)
schirmer@12854
  1272
    case (Direct new old)
schirmer@12854
  1273
    assume accmodi_old: "accmodi old = Package"
schirmer@12854
  1274
    assume outside_pack: "pid (declclass old) \<noteq> pid (declclass new)"
schirmer@12854
  1275
    assume "G \<turnstile>Method old inheritable_in pid (declclass new)"
schirmer@12854
  1276
    with accmodi_old 
schirmer@12854
  1277
    have "pid (declclass old) = pid (declclass new)"
schirmer@12854
  1278
      by (simp add: inheritable_in_def)
schirmer@12854
  1279
    with outside_pack 
schirmer@12854
  1280
    show "?P new old"
schirmer@12854
  1281
      by (contradiction)
schirmer@12854
  1282
  next
berghofe@21765
  1283
    case (Indirect new inter old)
schirmer@12854
  1284
    assume accmodi_old: "accmodi old = Package"
schirmer@12854
  1285
    assume outside_pack: "pid (declclass old) \<noteq> pid (declclass new)"
schirmer@12854
  1286
    assume override_new_inter: "G \<turnstile> new overrides inter"
schirmer@12854
  1287
    assume override_inter_old: "G \<turnstile> inter overrides old"
schirmer@12854
  1288
    assume hyp_new_inter: "\<lbrakk>accmodi inter = Package; 
schirmer@12854
  1289
                           pid (declclass inter) \<noteq> pid (declclass new)\<rbrakk>
schirmer@12854
  1290
                           \<Longrightarrow> ?P new inter"
schirmer@12854
  1291
    assume hyp_inter_old: "\<lbrakk>accmodi old = Package; 
schirmer@12854
  1292
                           pid (declclass old) \<noteq> pid (declclass inter)\<rbrakk>
schirmer@12854
  1293
                           \<Longrightarrow> ?P inter old"
schirmer@12854
  1294
    show "?P new old"
schirmer@12854
  1295
    proof (cases "pid (declclass old) = pid (declclass inter)")
schirmer@12854
  1296
      case True
schirmer@12854
  1297
      note same_pack_old_inter = this
schirmer@12854
  1298
      show ?thesis
schirmer@12854
  1299
      proof (cases "pid (declclass inter) = pid (declclass new)")
schirmer@12854
  1300
	case True
schirmer@12854
  1301
	with same_pack_old_inter outside_pack
schirmer@12854
  1302
	show ?thesis
schirmer@12854
  1303
	  by auto
schirmer@12854
  1304
      next
schirmer@12854
  1305
	case False
schirmer@12854
  1306
	note diff_pack_inter_new = this
schirmer@12854
  1307
	show ?thesis
schirmer@12854
  1308
	proof (cases "accmodi inter = Package")
schirmer@12854
  1309
	  case True
schirmer@12854
  1310
	  with diff_pack_inter_new hyp_new_inter  
schirmer@12854
  1311
	  obtain newinter where
schirmer@12854
  1312
	    over_new_newinter: "G \<turnstile> new overrides newinter" and
schirmer@12854
  1313
            over_newinter_inter: "G \<turnstile> newinter overrides inter" and 
schirmer@12854
  1314
            eq_pid: "pid (declclass inter) = pid (declclass newinter)" and
schirmer@12854
  1315
            accmodi_newinter: "Protected \<le> accmodi newinter"
schirmer@12854
  1316
	    by auto
schirmer@12854
  1317
	  from over_newinter_inter override_inter_old
schirmer@12854
  1318
	  have "G\<turnstile>newinter overrides old"
schirmer@12854
  1319
	    by (rule overridesR.Indirect)
schirmer@12854
  1320
	  moreover
schirmer@12854
  1321
	  from eq_pid same_pack_old_inter 
schirmer@12854
  1322
	  have "pid (declclass old) = pid (declclass newinter)"
schirmer@12854
  1323
	    by simp
schirmer@12854
  1324
	  moreover
schirmer@12854
  1325
	  note over_new_newinter accmodi_newinter
schirmer@12854
  1326
	  ultimately show ?thesis
schirmer@12854
  1327
	    by blast
schirmer@12854
  1328
	next
schirmer@12854
  1329
	  case False
schirmer@12854
  1330
	  with override_new_inter
schirmer@12854
  1331
	  have "Protected \<le> accmodi inter"
schirmer@12854
  1332
	    by (cases "accmodi inter") (auto dest: no_Private_override)
schirmer@12854
  1333
	  with override_new_inter override_inter_old same_pack_old_inter
schirmer@12854
  1334
	  show ?thesis
schirmer@12854
  1335
	    by blast
schirmer@12854
  1336
	qed
schirmer@12854
  1337
      qed
schirmer@12854
  1338
    next
schirmer@12854
  1339
      case False
schirmer@12854
  1340
      with accmodi_old hyp_inter_old
schirmer@12854
  1341
      obtain newinter where
schirmer@12854
  1342
	over_inter_newinter: "G \<turnstile> inter overrides newinter" and
schirmer@12854
  1343
          over_newinter_old: "G \<turnstile> newinter overrides old" and 
schirmer@12854
  1344
                eq_pid: "pid (declclass old) = pid (declclass newinter)" and
schirmer@12854
  1345
	accmodi_newinter: "Protected \<le> accmodi newinter"
schirmer@12854
  1346
	by auto
schirmer@12854
  1347
      from override_new_inter over_inter_newinter 
schirmer@12854
  1348
      have "G \<turnstile> new overrides newinter"
schirmer@12854
  1349
	by (rule overridesR.Indirect)
schirmer@12854
  1350
      with eq_pid over_newinter_old accmodi_newinter
schirmer@12854
  1351
      show ?thesis
schirmer@12854
  1352
	by blast
schirmer@12854
  1353
    qed
schirmer@12854
  1354
  qed
schirmer@12854
  1355
qed
schirmer@12854
  1356
schirmer@12854
  1357
lemma declclass_widen[rule_format]: 
schirmer@12854
  1358
 "wf_prog G 
schirmer@12854
  1359
 \<longrightarrow> (\<forall>c m. class G C = Some c \<longrightarrow> methd G C sig = Some m 
schirmer@12854
  1360
 \<longrightarrow> G\<turnstile>C \<preceq>\<^sub>C declclass m)" (is "?P G C")
schirmer@12854
  1361
proof (rule class_rec.induct,intro allI impI)
schirmer@12854
  1362
  fix G C c m
schirmer@12854
  1363
  assume Hyp: "\<forall>c. C \<noteq> Object \<and> ws_prog G \<and> class G C = Some c 
schirmer@12854
  1364
               \<longrightarrow> ?P G (super c)"
schirmer@12854
  1365
  assume wf: "wf_prog G" and cls_C: "class G C = Some c" and
schirmer@12854
  1366
         m:  "methd G C sig = Some m"
schirmer@12854
  1367
  show "G\<turnstile>C\<preceq>\<^sub>C declclass m" 
schirmer@12854
  1368
  proof (cases "C=Object")
schirmer@12854
  1369
    case True 
schirmer@12854
  1370
    with wf m show ?thesis by (simp add: methd_Object_SomeD)
schirmer@12854
  1371
  next
schirmer@12854
  1372
    let ?filter="filter_tab (\<lambda>sig m. G\<turnstile>C inherits method sig m)"
schirmer@12854
  1373
    let ?table = "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c))"
schirmer@12854
  1374
    case False 
schirmer@12854
  1375
    with cls_C wf m
schirmer@12854
  1376
    have methd_C: "(?filter (methd G (super c)) ++ ?table) sig = Some m "
schirmer@12854
  1377
      by (simp add: methd_rec)
schirmer@12854
  1378
    show ?thesis
schirmer@12854
  1379
    proof (cases "?table sig")
schirmer@12854
  1380
      case None
schirmer@12854
  1381
      from this methd_C have "?filter (methd G (super c)) sig = Some m"
schirmer@12854
  1382
	by simp
schirmer@12854
  1383
      moreover
schirmer@12854
  1384
      from wf cls_C False obtain sup where "class G (super c) = Some sup"
schirmer@12854
  1385
	by (blast dest: wf_prog_cdecl wf_cdecl_supD is_acc_class_is_class)
schirmer@12925
  1386
      moreover note wf False cls_C  
schirmer@12925
  1387
      ultimately have "G\<turnstile>super c \<preceq>\<^sub>C declclass m"  
schirmer@12925
  1388
	by (auto intro: Hyp [rule_format])
schirmer@12854
  1389
      moreover from cls_C False have  "G\<turnstile>C \<prec>\<^sub>C\<^sub>1 super c" by (rule subcls1I)
schirmer@12854
  1390
      ultimately show ?thesis by - (rule rtrancl_into_rtrancl2)
schirmer@12854
  1391
    next
schirmer@12854
  1392
      case Some
schirmer@12854
  1393
      from this wf False cls_C methd_C show ?thesis by auto
schirmer@12854
  1394
    qed
schirmer@12854
  1395
  qed
schirmer@12854
  1396
qed
schirmer@12854
  1397
schirmer@12854
  1398
lemma declclass_methd_Object: 
schirmer@12854
  1399
 "\<lbrakk>wf_prog G; methd G Object sig = Some m\<rbrakk> \<Longrightarrow> declclass m = Object"
schirmer@12854
  1400
by auto
schirmer@12854
  1401
schirmer@12854
  1402
lemma methd_declaredD: 
schirmer@12854
  1403
 "\<lbrakk>wf_prog G; is_class G C;methd G C sig = Some m\<rbrakk> 
schirmer@12854
  1404
  \<Longrightarrow> G\<turnstile>(mdecl (sig,mthd m)) declared_in (declclass m)"
schirmer@12854
  1405
proof -
schirmer@12854
  1406
  assume    wf: "wf_prog G"
schirmer@12854
  1407
  then have ws: "ws_prog G" ..
schirmer@12854
  1408
  assume  clsC: "is_class G C"
schirmer@12854
  1409
  from clsC ws 
schirmer@12854
  1410
  show "methd G C sig = Some m 
schirmer@12854
  1411
        \<Longrightarrow> G\<turnstile>(mdecl (sig,mthd m)) declared_in (declclass m)"
schirmer@12854
  1412
    (is "PROP ?P C") 
schirmer@12854
  1413
  proof (induct ?P C rule: ws_class_induct')
schirmer@12854
  1414
    case Object
schirmer@12854
  1415
    assume "methd G Object sig = Some m" 
schirmer@12854
  1416
    with wf show ?thesis
schirmer@12854
  1417
      by - (rule method_declared_inI, auto) 
schirmer@12854
  1418
  next
schirmer@12854
  1419
    case Subcls
schirmer@12854
  1420
    fix C c
schirmer@12854
  1421
    assume clsC: "class G C = Some c"
schirmer@12854
  1422
    and       m: "methd G C sig = Some m"
schirmer@12854
  1423
    and     hyp: "methd G (super c) sig = Some m \<Longrightarrow> ?thesis" 
schirmer@12854
  1424
    let ?newMethods = "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c))"
schirmer@12854
  1425
    show ?thesis
schirmer@12854
  1426
    proof (cases "?newMethods sig")
schirmer@12854
  1427
      case None
schirmer@12854
  1428
      from None ws clsC m hyp 
schirmer@12854
  1429
      show ?thesis by (auto intro: method_declared_inI simp add: methd_rec)
schirmer@12854
  1430
    next
schirmer@12854
  1431
      case Some
schirmer@12854
  1432
      from Some ws clsC m 
schirmer@12854
  1433
      show ?thesis by (auto intro: method_declared_inI simp add: methd_rec) 
schirmer@12854
  1434
    qed
schirmer@12854
  1435
  qed
schirmer@12854
  1436
qed
schirmer@12854
  1437
schirmer@12854
  1438
lemma methd_rec_Some_cases [consumes 4, case_names NewMethod InheritedMethod]:
wenzelm@12937
  1439
  assumes methd_C: "methd G C sig = Some m" and
wenzelm@12937
  1440
               ws: "ws_prog G" and
wenzelm@12937
  1441
             clsC: "class G C = Some c" and
wenzelm@12937
  1442
        neq_C_Obj: "C\<noteq>Object"
wenzelm@12937
  1443
  shows
schirmer@12854
  1444
"\<lbrakk>table_of (map (\<lambda>(s, m). (s, C, m)) (methods c)) sig = Some m \<Longrightarrow> P;
schirmer@12854
  1445
  \<lbrakk>G\<turnstile>C inherits (method sig m); methd G (super c) sig = Some m\<rbrakk> \<Longrightarrow> P 
schirmer@12854
  1446
 \<rbrakk> \<Longrightarrow> P"
schirmer@12854
  1447
proof -
schirmer@12854
  1448
  let ?inherited   = "filter_tab (\<lambda>sig m. G\<turnstile>C inherits method sig m) 
schirmer@12854
  1449
                              (methd G (super c))"
schirmer@12854
  1450
  let ?new = "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c))"
schirmer@12854
  1451
  from ws clsC neq_C_Obj methd_C 
schirmer@12854
  1452
  have methd_unfold: "(?inherited ++ ?new) sig = Some m"
schirmer@12854
  1453
    by (simp add: methd_rec)
schirmer@12854
  1454
  assume NewMethod: "?new sig = Some m \<Longrightarrow> P"
schirmer@12854
  1455
  assume InheritedMethod: "\<lbrakk>G\<turnstile>C inherits (method sig m); 
schirmer@12854
  1456
                            methd G (super c) sig = Some m\<rbrakk> \<Longrightarrow> P"
schirmer@12854
  1457
  show P
schirmer@12854
  1458
  proof (cases "?new sig")
schirmer@12854
  1459
    case None
schirmer@12854
  1460
    with methd_unfold have "?inherited sig = Some m"
schirmer@12854
  1461
      by (auto)
schirmer@12854
  1462
    with InheritedMethod show P by blast
schirmer@12854
  1463
  next
schirmer@12854
  1464
    case Some
schirmer@12854
  1465
    with methd_unfold have "?new sig = Some m"
schirmer@12854
  1466
      by auto
schirmer@12854
  1467
    with NewMethod show P by blast
schirmer@12854
  1468
  qed
schirmer@12854
  1469
qed
schirmer@12854
  1470
schirmer@12854
  1471
  
schirmer@12854
  1472
lemma methd_member_of:
wenzelm@12937
  1473
  assumes wf: "wf_prog G"
wenzelm@12937
  1474
  shows
wenzelm@12937
  1475
    "\<lbrakk>is_class G C; methd G C sig = Some m\<rbrakk> \<Longrightarrow> G\<turnstile>Methd sig m member_of C" 
schirmer@12854
  1476
  (is "?Class C \<Longrightarrow> ?Method C \<Longrightarrow> ?MemberOf C") 
schirmer@12854
  1477
proof -
schirmer@12854
  1478
  from wf   have   ws: "ws_prog G" ..
schirmer@12854
  1479
  assume defC: "is_class G C"
schirmer@12854
  1480
  from defC ws 
schirmer@12854
  1481
  show "?Class C \<Longrightarrow> ?Method C \<Longrightarrow> ?MemberOf C"
schirmer@12854
  1482
  proof (induct rule: ws_class_induct')  
schirmer@12854
  1483
    case Object
berghofe@13601
  1484
    with wf have declC: "Object = declclass m"
berghofe@13601
  1485
      by (simp add: declclass_methd_Object)
berghofe@13601
  1486
    from Object wf have "G\<turnstile>Methd sig m declared_in Object"
berghofe@13601
  1487
      by (auto intro: methd_declaredD simp add: declC)
schirmer@12854
  1488
    with declC 
schirmer@12854
  1489
    show "?MemberOf Object"
schirmer@12854
  1490
      by (auto intro!: members.Immediate
schirmer@12854
  1491
                  simp del: methd_Object)
schirmer@12854
  1492
  next
schirmer@12854
  1493
    case (Subcls C c)
schirmer@12854
  1494
    assume  clsC: "class G C = Some c" and
schirmer@12854
  1495
       neq_C_Obj: "C \<noteq> Object"  
schirmer@12854
  1496
    assume methd: "?Method C"
schirmer@12854
  1497
    from methd ws clsC neq_C_Obj
schirmer@12854
  1498
    show "?MemberOf C"
schirmer@12854
  1499
    proof (cases rule: methd_rec_Some_cases)
schirmer@12854
  1500
      case NewMethod
schirmer@12854
  1501
      with clsC show ?thesis
schirmer@12854
  1502
	by (auto dest: method_declared_inI intro!: members.Immediate)
schirmer@12854
  1503
    next
schirmer@12854
  1504
      case InheritedMethod
schirmer@12854
  1505
      then show "?thesis"
schirmer@12854
  1506
	by (blast dest: inherits_member)
schirmer@12854
  1507
    qed
schirmer@12854
  1508
  qed
schirmer@12854
  1509
qed
schirmer@12854
  1510
schirmer@12854
  1511
lemma current_methd: 
schirmer@12854
  1512
      "\<lbrakk>table_of (methods c) sig = Some new;
schirmer@12854
  1513
        ws_prog G; class G C = Some c; C \<noteq> Object; 
schirmer@12854
  1514
        methd G (super c) sig = Some old\<rbrakk> 
schirmer@12854
  1515
    \<Longrightarrow> methd G C sig = Some (C,new)"
schirmer@12854
  1516
by (auto simp add: methd_rec
nipkow@14025
  1517
            intro: filter_tab_SomeI map_add_find_right table_of_map_SomeI)
schirmer@12854
  1518
schirmer@12854
  1519
lemma wf_prog_staticD:
wenzelm@12937
  1520
  assumes     wf: "wf_prog G" and
schirmer@12854
  1521
            clsC: "class G C = Some c" and
schirmer@12854
  1522
       neq_C_Obj: "C \<noteq> Object" and 
schirmer@12854
  1523
             old: "methd G (super c) sig = Some old" and 
schirmer@12854
  1524
     accmodi_old: "Protected \<le> accmodi old" and
schirmer@12854
  1525
             new: "table_of (methods c) sig = Some new"
wenzelm@12937
  1526
  shows "is_static new = is_static old"
schirmer@12854
  1527
proof -
schirmer@12854
  1528
  from clsC wf 
schirmer@12854
  1529
  have wf_cdecl: "wf_cdecl G (C,c)" by (rule wf_prog_cdecl)
schirmer@12854
  1530
  from wf clsC neq_C_Obj
schirmer@12854
  1531
  have is_cls_super: "is_class G (super c)" 
schirmer@12854
  1532
    by (blast dest: wf_prog_acc_superD is_acc_classD)
schirmer@12854
  1533
  from wf is_cls_super old 
schirmer@12854
  1534
  have old_member_of: "G\<turnstile>Methd sig old member_of (super c)"  
schirmer@12854
  1535
    by (rule methd_member_of)
schirmer@12854
  1536
  from old wf is_cls_super 
schirmer@12854
  1537
  have old_declared: "G\<turnstile>Methd sig old declared_in (declclass old)"
schirmer@12854
  1538
    by (auto dest: methd_declared_in_declclass)
schirmer@12854
  1539
  from new clsC 
schirmer@12854
  1540
  have new_declared: "G\<turnstile>Methd sig (C,new) declared_in C"
schirmer@12854
  1541
    by (auto intro: method_declared_inI)
schirmer@12854
  1542
  note trancl_rtrancl_tranc = trancl_rtrancl_trancl [trans] (* ### in Basis *)
schirmer@12854
  1543
  from clsC neq_C_Obj
schirmer@12854
  1544
  have subcls1_C_super: "G\<turnstile>C \<prec>\<^sub>C\<^sub>1 super c"
schirmer@12854
  1545
    by (rule subcls1I)
schirmer@12854
  1546
  then have "G\<turnstile>C \<prec>\<^sub>C super c" ..
schirmer@12854
  1547
  also from old wf is_cls_super
schirmer@12854
  1548
  have "G\<turnstile>super c \<preceq>\<^sub>C (declclass old)" by (auto dest: methd_declC)
schirmer@12854
  1549
  finally have subcls_C_old:  "G\<turnstile>C \<prec>\<^sub>C (declclass old)" .
schirmer@12854
  1550
  from accmodi_old 
schirmer@12854
  1551
  have inheritable: "G\<turnstile>Methd sig old inheritable_in pid C"
schirmer@12854
  1552
    by (auto simp add: inheritable_in_def
schirmer@12854
  1553
                 dest: acc_modi_le_Dests)
schirmer@12854
  1554
  show ?thesis
schirmer@12854
  1555
  proof (cases "is_static new")
schirmer@12854
  1556
    case True
schirmer@12854
  1557
    with subcls_C_old new_declared old_declared inheritable
schirmer@12854
  1558
    have "G,sig\<turnstile>(C,new) hides old"
schirmer@12854
  1559
      by (auto intro: hidesI)
schirmer@12854
  1560
    with True wf_cdecl neq_C_Obj new 
schirmer@12854
  1561
    show ?thesis
schirmer@12854
  1562
      by (auto dest: wf_cdecl_hides_SomeD)
schirmer@12854
  1563
  next
schirmer@12854
  1564
    case False
schirmer@12854
  1565
    with subcls_C_old new_declared old_declared inheritable subcls1_C_super
schirmer@12854
  1566
         old_member_of
schirmer@12854
  1567
    have "G,sig\<turnstile>(C,new) overrides\<^sub>S old"
schirmer@12854
  1568
      by (auto intro: stat_overridesR.Direct)
schirmer@12854
  1569
    with False wf_cdecl neq_C_Obj new 
schirmer@12854
  1570
    show ?thesis
schirmer@12854
  1571
      by (auto dest: wf_cdecl_overrides_SomeD)
schirmer@12854
  1572
  qed
schirmer@12854
  1573
qed
schirmer@12854
  1574
schirmer@12854
  1575
lemma inheritable_instance_methd: 
wenzelm@12937
  1576
  assumes subclseq_C_D: "G\<turnstile>C \<preceq>\<^sub>C D" and
schirmer@12854
  1577
              is_cls_D: "is_class G D" and
schirmer@12854
  1578
                    wf: "wf_prog G" and 
schirmer@12854
  1579
                   old: "methd G D sig = Some old" and
schirmer@12854
  1580
           accmodi_old: "Protected \<le> accmodi old" and  
schirmer@12854
  1581
        not_static_old: "\<not> is_static old"
wenzelm@12937
  1582
  shows
schirmer@12854
  1583
  "\<exists>new. methd G C sig = Some new \<and>
schirmer@12854
  1584
         (new = old \<or> G,sig\<turnstile>new overrides\<^sub>S old)"
schirmer@12854
  1585
 (is "(\<exists>new. (?Constraint C new old))")
schirmer@12854
  1586
proof -
schirmer@12854
  1587
  from subclseq_C_D is_cls_D 
schirmer@12854
  1588
  have is_cls_C: "is_class G C" by (rule subcls_is_class2) 
schirmer@12854
  1589
  from wf 
schirmer@12854
  1590
  have ws: "ws_prog G" ..
schirmer@12854
  1591
  from is_cls_C ws subclseq_C_D 
schirmer@12854
  1592
  show "\<exists>new. ?Constraint C new old"
schirmer@12854
  1593
  proof (induct rule: ws_class_induct')
schirmer@12854
  1594
    case (Object co)
schirmer@12854
  1595
    then have eq_D_Obj: "D=Object" by auto
schirmer@12854
  1596
    with old 
schirmer@12854
  1597
    have "?Constraint Object old old"
schirmer@12854
  1598
      by auto
schirmer@12854
  1599
    with eq_D_Obj 
schirmer@12854
  1600
    show "\<exists> new. ?Constraint Object new old" by auto
schirmer@12854
  1601
  next
schirmer@12854
  1602
    case (Subcls C c)
schirmer@12854
  1603
    assume hyp: "G\<turnstile>super c\<preceq>\<^sub>C D \<Longrightarrow> \<exists>new. ?Constraint (super c) new old"
schirmer@12854
  1604
    assume clsC: "class G C = Some c"
schirmer@12854
  1605
    assume neq_C_Obj: "C\<noteq>Object"
schirmer@12854
  1606
    from clsC wf 
schirmer@12854
  1607
    have wf_cdecl: "wf_cdecl G (C,c)" 
schirmer@12854
  1608
      by (rule wf_prog_cdecl)
schirmer@12854
  1609
    from ws clsC neq_C_Obj
schirmer@12854
  1610
    have is_cls_super: "is_class G (super c)"
schirmer@12854
  1611
      by (auto dest: ws_prog_cdeclD)
schirmer@12854
  1612
    from clsC wf neq_C_Obj 
schirmer@12854
  1613
    have superAccessible: "G\<turnstile>(Class (super c)) accessible_in (pid C)" and
schirmer@12854
  1614
	 subcls1_C_super: "G\<turnstile>C \<prec>\<^sub>C\<^sub>1 super c"
schirmer@12854
  1615
      by (auto dest: wf_prog_cdecl wf_cdecl_supD is_acc_classD
schirmer@12854
  1616
              intro: subcls1I)
schirmer@12854
  1617
    show "\<exists>new. ?Constraint C new old"
schirmer@12854
  1618
    proof (cases "G\<turnstile>super c\<preceq>\<^sub>C D")
schirmer@12854
  1619
      case False
schirmer@12854
  1620
      from False Subcls 
schirmer@12854
  1621
      have eq_C_D: "C=D"
schirmer@12854
  1622
	by (auto dest: subclseq_superD)
schirmer@12854
  1623
      with old 
schirmer@12854
  1624
      have "?Constraint C old old"
schirmer@12854
  1625
	by auto
schirmer@12854
  1626
      with eq_C_D 
schirmer@12854
  1627
      show "\<exists> new. ?Constraint C new old" by auto
schirmer@12854
  1628
    next
schirmer@12854
  1629
      case True
schirmer@12854
  1630
      with hyp obtain super_method
schirmer@12854
  1631
	where super: "?Constraint (super c) super_method old" by blast
schirmer@12854
  1632
      from super not_static_old
schirmer@12854
  1633
      have not_static_super: "\<not> is_static super_method"
schirmer@12854
  1634
	by (auto dest!: stat_overrides_commonD)
schirmer@12854
  1635
      from super old wf accmodi_old
schirmer@12854
  1636
      have accmodi_super_method: "Protected \<le> accmodi super_method"
haftmann@22424
  1637
	by (auto dest!: wf_prog_stat_overridesD)
schirmer@12854
  1638
      from super accmodi_old wf
schirmer@12854
  1639
      have inheritable: "G\<turnstile>Methd sig super_method inheritable_in (pid C)"
schirmer@12854
  1640
	by (auto dest!: wf_prog_stat_overridesD
schirmer@12854
  1641
                        acc_modi_le_Dests
schirmer@12854
  1642
              simp add: inheritable_in_def)	           
schirmer@12854
  1643
      from super wf is_cls_super
schirmer@12854
  1644
      have member: "G\<turnstile>Methd sig super_method member_of (super c)"
schirmer@12854
  1645
	by (auto intro: methd_member_of) 
schirmer@12854
  1646
      from member
schirmer@12854
  1647
      have decl_super_method:
schirmer@12854
  1648
        "G\<turnstile>Methd sig super_method declared_in (declclass super_method)"
schirmer@12854
  1649
	by (auto dest: member_of_declC)
schirmer@12854
  1650
      from super subcls1_C_super ws is_cls_super 
schirmer@12854
  1651
      have subcls_C_super: "G\<turnstile>C \<prec>\<^sub>C (declclass super_method)"
schirmer@12854
  1652
	by (auto intro: rtrancl_into_trancl2 dest: methd_declC) 
schirmer@12854
  1653
      show "\<exists> new. ?Constraint C new old"
schirmer@12854
  1654
      proof (cases "methd G C sig")
schirmer@12854
  1655
	case None
schirmer@12854
  1656
	have "methd G (super c) sig = None"
schirmer@12854
  1657
	proof -
schirmer@12854
  1658
	  from clsC ws None 
schirmer@12854
  1659
	  have no_new: "table_of (methods c) sig = None" 
schirmer@12854
  1660
	    by (auto simp add: methd_rec)
schirmer@12854
  1661
	  with clsC 
schirmer@12854
  1662
	  have undeclared: "G\<turnstile>mid sig undeclared_in C"
schirmer@12854
  1663
	    by (auto simp add: undeclared_in_def cdeclaredmethd_def)
schirmer@12854
  1664
	  with inheritable member superAccessible subcls1_C_super
schirmer@12854
  1665
	  have inherits: "G\<turnstile>C inherits (method sig super_method)"
schirmer@12854
  1666
	    by (auto simp add: inherits_def)
schirmer@12854
  1667
	  with clsC ws no_new super neq_C_Obj
schirmer@12854
  1668
	  have "methd G C sig = Some super_method"
nipkow@14025
  1669
	    by (auto simp add: methd_rec map_add_def intro: filter_tab_SomeI)
schirmer@12854
  1670
          with None show ?thesis
schirmer@12854
  1671
	    by simp
schirmer@12854
  1672
	qed
schirmer@12854
  1673
	with super show ?thesis by auto
schirmer@12854
  1674
      next
schirmer@12854
  1675
	case (Some new)
schirmer@12854
  1676
	from this ws clsC neq_C_Obj
schirmer@12854
  1677
	show ?thesis
schirmer@12854
  1678
	proof (cases rule: methd_rec_Some_cases)
schirmer@12854
  1679
	  case InheritedMethod
schirmer@12854
  1680
	  with super Some show ?thesis 
schirmer@12854
  1681
	    by auto
schirmer@12854
  1682
	next
schirmer@12854
  1683
	  case NewMethod
schirmer@12854
  1684
	  assume new: "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c)) sig 
schirmer@12854
  1685
                       = Some new"
schirmer@12854
  1686
	  from new 
schirmer@12854
  1687
	  have declcls_new: "declclass new = C" 
schirmer@12854
  1688
	    by auto
schirmer@12854
  1689
	  from wf clsC neq_C_Obj super new not_static_super accmodi_super_method
schirmer@12854
  1690
	  have not_static_new: "\<not> is_static new" 
schirmer@12854
  1691
	    by (auto dest: wf_prog_staticD) 
schirmer@12854
  1692
	  from clsC new
schirmer@12854
  1693
	  have decl_new: "G\<turnstile>Methd sig new declared_in C"
schirmer@12854
  1694
	    by (auto simp add: declared_in_def cdeclaredmethd_def)
schirmer@12854
  1695
	  from not_static_new decl_new decl_super_method
schirmer@12854
  1696
	       member subcls1_C_super inheritable declcls_new subcls_C_super 
schirmer@12854
  1697
	  have "G,sig\<turnstile> new overrides\<^sub>S super_method"
schirmer@12854
  1698
	    by (auto intro: stat_overridesR.Direct) 
schirmer@12854
  1699
	  with super Some
schirmer@12854
  1700
	  show ?thesis
schirmer@12854
  1701
	    by (auto intro: stat_overridesR.Indirect)
schirmer@12854
  1702
	qed
schirmer@12854
  1703
      qed
schirmer@12854
  1704
    qed
schirmer@12854
  1705
  qed
schirmer@12854
  1706
qed
schirmer@12854
  1707
schirmer@12854
  1708
lemma inheritable_instance_methd_cases [consumes 6
schirmer@12854
  1709
                                       , case_names Inheritance Overriding]: 
wenzelm@12937
  1710
  assumes subclseq_C_D: "G\<turnstile>C \<preceq>\<^sub>C D" and
schirmer@12854
  1711
              is_cls_D: "is_class G D" and
schirmer@12854
  1712
                    wf: "wf_prog G" and 
schirmer@12854
  1713
                   old: "methd G D sig = Some old" and
schirmer@12854
  1714
           accmodi_old: "Protected \<le> accmodi old" and  
schirmer@12854
  1715
        not_static_old: "\<not> is_static old" and
schirmer@12854
  1716
           inheritance:  "methd G C sig = Some old \<Longrightarrow> P" and
schirmer@12854
  1717
            overriding:  "\<And> new. \<lbrakk>methd G C sig = Some new;
schirmer@12854
  1718
                                   G,sig\<turnstile>new overrides\<^sub>S old\<rbrakk> \<Longrightarrow> P"
schirmer@12854
  1719
        
wenzelm@12937
  1720
  shows P
schirmer@12854
  1721
proof -
schirmer@12854
  1722
from subclseq_C_D is_cls_D wf old accmodi_old not_static_old 
schirmer@12854
  1723
show ?thesis
schirmer@12925
  1724
  by (auto dest: inheritable_instance_methd intro: inheritance overriding)
schirmer@12854
  1725
qed
schirmer@12854
  1726
schirmer@12854
  1727
lemma inheritable_instance_methd_props: 
wenzelm@12937
  1728
  assumes subclseq_C_D: "G\<turnstile>C \<preceq>\<^sub>C D" and
schirmer@12854
  1729
              is_cls_D: "is_class G D" and
schirmer@12854
  1730
                    wf: "wf_prog G" and 
schirmer@12854
  1731
                   old: "methd G D sig = Some old" and
schirmer@12854
  1732
           accmodi_old: "Protected \<le> accmodi old" and  
schirmer@12854
  1733
        not_static_old: "\<not> is_static old"
wenzelm@12937
  1734
  shows
schirmer@12854
  1735
  "\<exists>new. methd G C sig = Some new \<and>
schirmer@12854
  1736
          \<not> is_static new \<and> G\<turnstile>resTy new\<preceq>resTy old \<and> accmodi old \<le>accmodi new"
schirmer@12854
  1737
 (is "(\<exists>new. (?Constraint C new old))")
schirmer@12854
  1738
proof -
schirmer@12854
  1739
  from subclseq_C_D is_cls_D wf old accmodi_old not_static_old 
schirmer@12854
  1740
  show ?thesis
schirmer@12854
  1741
  proof (cases rule: inheritable_instance_methd_cases)
schirmer@12854
  1742
    case Inheritance
schirmer@12854
  1743
    with not_static_old accmodi_old show ?thesis by auto
schirmer@12854
  1744
  next
schirmer@12854
  1745
    case (Overriding new)
schirmer@12854
  1746
    then have "\<not> is_static new" by (auto dest: stat_overrides_commonD)
schirmer@12854
  1747
    with Overriding not_static_old accmodi_old wf 
schirmer@12854
  1748
    show ?thesis 
haftmann@22424
  1749
      by (auto dest!: wf_prog_stat_overridesD)
schirmer@12854
  1750
  qed
schirmer@12854
  1751
qed
schirmer@13688
  1752
 	      
schirmer@12854
  1753
(* local lemma *)
wenzelm@24019
  1754
lemma bexI': "x \<in> A \<Longrightarrow> P x \<Longrightarrow> \<exists>x\<in>A. P x" by blast
wenzelm@24019
  1755
lemma ballE': "\<forall>x\<in>A. P x \<Longrightarrow> (x \<notin> A \<Longrightarrow> Q) \<Longrightarrow> (P x \<Longrightarrow> Q) \<Longrightarrow> Q" by blast
wenzelm@24019
  1756
schirmer@12854
  1757
lemma subint_widen_imethds: 
schirmer@12854
  1758
 "\<lbrakk>G\<turnstile>I\<preceq>I J; wf_prog G; is_iface G J; jm \<in> imethds G J sig\<rbrakk> \<Longrightarrow>   
schirmer@12854
  1759
  \<exists> im \<in> imethds G I sig. is_static im = is_static jm \<and> 
schirmer@12854
  1760
                          accmodi im = accmodi jm \<and>
schirmer@12854
  1761
                          G\<turnstile>resTy im\<preceq>resTy jm"
schirmer@12854
  1762
proof -
schirmer@12854
  1763
  assume irel: "G\<turnstile>I\<preceq>I J" and
schirmer@12854
  1764
           wf: "wf_prog G" and
schirmer@12854
  1765
     is_iface: "is_iface G J"
schirmer@12854
  1766
  from irel show "jm \<in> imethds G J sig \<Longrightarrow> ?thesis" 
schirmer@12854
  1767
               (is "PROP ?P I" is "PROP ?Prem J \<Longrightarrow> ?Concl I")
schirmer@12854
  1768
  proof (induct ?P I rule: converse_rtrancl_induct) 
schirmer@12854
  1769
    case Id
schirmer@12854
  1770
    assume "jm \<in> imethds G J sig"
schirmer@12854
  1771
    then show "?Concl J" by  (blast elim: bexI')
schirmer@12854
  1772
  next
schirmer@12854
  1773
    case Step
schirmer@12854
  1774
    fix I SI
schirmer@12854
  1775
    assume subint1_I_SI: "G\<turnstile>I \<prec>I1 SI" and 
schirmer@12854
  1776
            subint_SI_J: "G\<turnstile>SI \<preceq>I J" and
schirmer@12854
  1777
                    hyp: "PROP ?P SI" and
schirmer@12854
  1778
                     jm: "jm \<in> imethds G J sig"
schirmer@12854
  1779
    from subint1_I_SI 
schirmer@12854
  1780
    obtain i where
schirmer@12854
  1781
      ifI: "iface G I = Some i" and
schirmer@12854
  1782
       SI: "SI \<in> set (isuperIfs i)"
schirmer@12854
  1783
      by (blast dest: subint1D)
schirmer@12854
  1784
schirmer@12854
  1785
    let ?newMethods 
nipkow@30235
  1786
          = "(Option.set \<circ> table_of (map (\<lambda>(sig, mh). (sig, I, mh)) (imethods i)))"
schirmer@12854
  1787
    show "?Concl I"
schirmer@12854
  1788
    proof (cases "?newMethods sig = {}")
schirmer@12854
  1789
      case True
schirmer@12854
  1790
      with ifI SI hyp wf jm 
schirmer@12854
  1791
      show "?thesis" 
schirmer@12854
  1792
	by (auto simp add: imethds_rec) 
schirmer@12854
  1793
    next
schirmer@12854
  1794
      case False
schirmer@12854
  1795
      from ifI wf False
schirmer@12854
  1796
      have imethds: "imethds G I sig = ?newMethods sig"
schirmer@12854
  1797
	by (simp add: imethds_rec)
schirmer@12854
  1798
      from False
schirmer@12854
  1799
      obtain im where
schirmer@12854
  1800
        imdef: "im \<in> ?newMethods sig" 
schirmer@12854
  1801
	by (blast)
schirmer@12854
  1802
      with imethds 
schirmer@12854
  1803
      have im: "im \<in> imethds G I sig"
schirmer@12854
  1804
	by (blast)
schirmer@12854
  1805
      with im wf ifI 
schirmer@12854
  1806
      obtain
schirmer@12854
  1807
	 imStatic: "\<not> is_static im" and
schirmer@12854
  1808
         imPublic: "accmodi im = Public"
schirmer@12854
  1809
	by (auto dest!: imethds_wf_mhead)	
schirmer@12854
  1810
      from ifI wf 
schirmer@12854
  1811
      have wf_I: "wf_idecl G (I,i)" 
schirmer@12854
  1812
	by (rule wf_prog_idecl)
schirmer@12854
  1813
      with SI wf  
schirmer@12854
  1814
      obtain si where
schirmer@12854
  1815
	 ifSI: "iface G SI = Some si" and
schirmer@12854
  1816
	wf_SI: "wf_idecl G (SI,si)" 
schirmer@12854
  1817
	by (auto dest!: wf_idecl_supD is_acc_ifaceD
schirmer@12854
  1818
                  dest: wf_prog_idecl)
schirmer@12854
  1819
      from jm hyp 
schirmer@12854
  1820
      obtain sim::"qtname \<times> mhead"  where
schirmer@12854
  1821
                      sim: "sim \<in> imethds G SI sig" and
schirmer@12854
  1822
         eq_static_sim_jm: "is_static sim = is_static jm" and 
schirmer@12854
  1823
         eq_access_sim_jm: "accmodi sim = accmodi jm" and 
schirmer@12854
  1824
        resTy_widen_sim_jm: "G\<turnstile>resTy sim\<preceq>resTy jm"
schirmer@12854
  1825
	by blast
schirmer@12854
  1826
      with wf_I SI imdef sim 
schirmer@12854
  1827
      have "G\<turnstile>resTy im\<preceq>resTy sim"   
schirmer@12854
  1828
	by (auto dest!: wf_idecl_hidings hidings_entailsD)
schirmer@12854
  1829
      with wf resTy_widen_sim_jm 
schirmer@12854
  1830
      have resTy_widen_im_jm: "G\<turnstile>resTy im\<preceq>resTy jm"
schirmer@12854
  1831
	by (blast intro: widen_trans)
schirmer@12854
  1832
      from sim wf ifSI  
schirmer@12854
  1833
      obtain
schirmer@12854
  1834
	simStatic: "\<not> is_static sim" and
schirmer@12854
  1835
        simPublic: "accmodi sim = Public"
schirmer@12854
  1836
	by (auto dest!: imethds_wf_mhead)
schirmer@12854
  1837
      from im 
schirmer@12854
  1838
           imStatic simStatic eq_static_sim_jm
schirmer@12854
  1839
           imPublic simPublic eq_access_sim_jm
schirmer@12854
  1840
           resTy_widen_im_jm
schirmer@12854
  1841
      show ?thesis 
schirmer@12854
  1842
	by auto 
schirmer@12854
  1843
    qed
schirmer@12854
  1844
  qed
schirmer@12854
  1845
qed
schirmer@12854
  1846
     
schirmer@12854
  1847
(* Tactical version *)
schirmer@12854
  1848
(* 
schirmer@12854
  1849
lemma subint_widen_imethds: "\<lbrakk>G\<turnstile>I\<preceq>I J; wf_prog G; is_iface G J\<rbrakk> \<Longrightarrow>  
schirmer@12854
  1850
  \<forall> jm \<in> imethds G J sig.  
schirmer@12854
  1851
  \<exists> im \<in> imethds G I sig. static (mthd im)=static (mthd jm) \<and> 
schirmer@12854
  1852
                          access (mthd im)= access (mthd jm) \<and>
schirmer@12854
  1853
                          G\<turnstile>resTy (mthd im)\<preceq>resTy (mthd jm)"
schirmer@12854
  1854
apply (erule converse_rtrancl_induct)
schirmer@12854
  1855
apply  (clarsimp elim!: bexI')
schirmer@12854
  1856
apply (frule subint1D)
schirmer@12854
  1857
apply clarify
schirmer@12854
  1858
apply (erule ballE')
schirmer@12854
  1859
apply  fast
schirmer@12854
  1860
apply (erule_tac V = "?x \<in> imethds G J sig" in thin_rl)
schirmer@12854
  1861
apply clarsimp
schirmer@12854
  1862
apply (subst imethds_rec, assumption, erule wf_ws_prog)
schirmer@12854
  1863
apply (unfold overrides_t_def)
schirmer@12854
  1864
apply (drule (1) wf_prog_idecl)
schirmer@12854
  1865
apply (frule (3) imethds_wf_mhead [OF _ _ wf_idecl_supD [THEN conjunct1 
schirmer@12854
  1866
                                       [THEN is_acc_ifaceD [THEN conjunct1]]]])
nipkow@30235
  1867
apply (case_tac "(Option.set \<circ> table_of (map (\<lambda>(s, mh). (s, y, mh)) (imethods i)))
schirmer@12854
  1868
                  sig ={}")
schirmer@12854
  1869
apply   force
schirmer@12854
  1870
schirmer@12854
  1871
apply   (simp only:)
schirmer@12854
  1872
apply   (simp)
schirmer@12854
  1873
apply   clarify
schirmer@12854
  1874
apply   (frule wf_idecl_hidings [THEN hidings_entailsD])
schirmer@12854
  1875
apply     blast
schirmer@12854
  1876
apply     blast
schirmer@12854
  1877
apply   (rule bexI')
schirmer@12854
  1878
apply     simp
schirmer@12854
  1879
apply     (drule table_of_map_SomeI [of _ "sig"])
schirmer@12854
  1880
apply     simp
schirmer@12854
  1881
schirmer@12854
  1882
apply     (frule wf_idecl_mhead [of _ _ _ "sig"])
schirmer@12854
  1883
apply       (rule table_of_Some_in_set)
schirmer@12854
  1884
apply       assumption
schirmer@12854
  1885
apply     auto
schirmer@12854
  1886
done
schirmer@12854
  1887
*)
schirmer@12854
  1888
    
schirmer@12854
  1889
schirmer@12854
  1890
(* local lemma *)
schirmer@12854
  1891
lemma implmt1_methd: 
schirmer@12854
  1892
 "\<And>sig. \<lbrakk>G\<turnstile>C\<leadsto>1I; wf_prog G; im \<in> imethds G I sig\<rbrakk> \<Longrightarrow>  
schirmer@12854
  1893
  \<exists>cm \<in>methd G C sig: \<not> is_static cm \<and> \<not> is_static im \<and> 
schirmer@12854
  1894
                       G\<turnstile>resTy cm\<preceq>resTy im \<and>
schirmer@12854
  1895
                       accmodi im = Public \<and> accmodi cm = Public"
schirmer@12854
  1896
apply (drule implmt1D)
schirmer@12854
  1897
apply clarify
schirmer@12854
  1898
apply (drule (2) wf_prog_cdecl [THEN wf_cdecl_impD])
schirmer@12854
  1899
apply (frule (1) imethds_wf_mhead)
schirmer@12854
  1900
apply  (simp add: is_acc_iface_def)
schirmer@12854
  1901
apply (force)
schirmer@12854
  1902
done
schirmer@12854
  1903
schirmer@12854
  1904
schirmer@12854
  1905
(* local lemma *)
schirmer@12854
  1906
lemma implmt_methd [rule_format (no_asm)]: 
schirmer@12854
  1907
"\<lbrakk>wf_prog G; G\<turnstile>C\<leadsto>I\<rbrakk> \<Longrightarrow> is_iface G I \<longrightarrow>  
schirmer@12854
  1908
 (\<forall> im    \<in>imethds G I   sig.  
schirmer@12854
  1909
  \<exists> cm\<in>methd G C sig: \<not>is_static cm \<and> \<not> is_static im \<and> 
schirmer@12854
  1910
                      G\<turnstile>resTy cm\<preceq>resTy im \<and>
schirmer@12854
  1911
                      accmodi im = Public \<and> accmodi cm = Public)"
schirmer@12854
  1912
apply (frule implmt_is_class)
schirmer@12854
  1913
apply (erule implmt.induct)
schirmer@12854
  1914
apply   safe
schirmer@12854
  1915
apply   (drule (2) implmt1_methd)
schirmer@12854
  1916
apply   fast
schirmer@12854
  1917
apply  (drule (1) subint_widen_imethds)
schirmer@12854
  1918
apply   simp
schirmer@12854
  1919
apply   assumption
schirmer@12854
  1920
apply  clarify
schirmer@12854
  1921
apply  (drule (2) implmt1_methd)
schirmer@12854
  1922
apply  (force)
schirmer@12854
  1923
apply (frule subcls1D)
schirmer@12854
  1924
apply (drule (1) bspec)
schirmer@12854
  1925
apply clarify
schirmer@12854
  1926
apply (drule (3) r_into_rtrancl [THEN inheritable_instance_methd_props, 
schirmer@12854
  1927
                                 OF _ implmt_is_class])
schirmer@12854
  1928
apply auto 
schirmer@12854
  1929
done
schirmer@12854
  1930
schirmer@12854
  1931
lemma mheadsD [rule_format (no_asm)]: 
schirmer@12854
  1932
"emh \<in> mheads G S t sig \<longrightarrow> wf_prog G \<longrightarrow>
schirmer@12854
  1933
 (\<exists>C D m. t = ClassT C \<and> declrefT emh = ClassT D \<and> 
schirmer@12854
  1934
          accmethd G S C sig = Some m \<and>
schirmer@12854
  1935
          (declclass m = D) \<and> mhead (mthd m) = (mhd emh)) \<or>
schirmer@12854
  1936
 (\<exists>I. t = IfaceT I \<and> ((\<exists>im. im  \<in> accimethds G (pid S) I sig \<and> 
schirmer@12854
  1937
          mthd im = mhd emh) \<or> 
schirmer@12854
  1938
  (\<exists>m. G\<turnstile>Iface I accessible_in (pid S) \<and> accmethd G S Object sig = Some m \<and> 
schirmer@12854
  1939
       accmodi m \<noteq> Private \<and> 
schirmer@12854
  1940
       declrefT emh = ClassT Object \<and> mhead (mthd m) = mhd emh))) \<or>
schirmer@12854
  1941
 (\<exists>T m. t = ArrayT T \<and> G\<turnstile>Array T accessible_in (pid S) \<and>
schirmer@12854
  1942
        accmethd G S Object sig = Some m \<and> accmodi m \<noteq> Private \<and> 
schirmer@12854
  1943
        declrefT emh = ClassT Object \<and> mhead (mthd m) = mhd emh)"
ballarin@14174
  1944
apply (rule_tac ref_ty1="t" in ref_ty_ty.induct [THEN conjunct1])
schirmer@12854
  1945
apply auto
schirmer@12854
  1946
apply (auto simp add: cmheads_def accObjectmheads_def Objectmheads_def)
schirmer@12854
  1947
apply (auto  dest!: accmethd_SomeD)
schirmer@12854
  1948
done
schirmer@12854
  1949
schirmer@12854
  1950
lemma mheads_cases [consumes 2, case_names Class_methd 
schirmer@12854
  1951
                    Iface_methd Iface_Object_methd Array_Object_methd]: 
schirmer@12854
  1952
"\<lbrakk>emh \<in> mheads G S t sig; wf_prog G;
schirmer@12854
  1953
 \<And> C D m. \<lbrakk>t = ClassT C;declrefT emh = ClassT D; accmethd G S C sig = Some m;
schirmer@12854
  1954
           (declclass m = D); mhead (mthd m) = (mhd emh)\<rbrakk> \<Longrightarrow> P emh; 
schirmer@12854
  1955
 \<And> I im. \<lbrakk>t = IfaceT I; im  \<in> accimethds G (pid S) I sig; mthd im = mhd emh\<rbrakk>
schirmer@12854
  1956
          \<Longrightarrow> P emh;
schirmer@12854
  1957
 \<And> I m. \<lbrakk>t = IfaceT I; G\<turnstile>Iface I accessible_in (pid S);
schirmer@12854
  1958
          accmethd G S Object sig = Some m; accmodi m \<noteq> Private;
schirmer@12854
  1959
         declrefT emh = ClassT Object; mhead (mthd m) = mhd emh\<rbrakk> \<Longrightarrow> P emh;
schirmer@12854
  1960
 \<And> T m. \<lbrakk>t = ArrayT T;G\<turnstile>Array T accessible_in (pid S);
schirmer@12854
  1961
          accmethd G S Object sig = Some m; accmodi m \<noteq> Private; 
schirmer@12854
  1962
          declrefT emh = ClassT Object; mhead (mthd m) = mhd emh\<rbrakk> \<Longrightarrow>  P emh 
schirmer@12854
  1963
\<rbrakk> \<Longrightarrow> P emh"
schirmer@12854
  1964
by (blast dest!: mheadsD)
schirmer@12854
  1965
schirmer@12854
  1966
lemma declclassD[rule_format]:
schirmer@12854
  1967
 "\<lbrakk>wf_prog G;class G C = Some c; methd G C sig = Some m; 
schirmer@12854
  1968
   class G (declclass m) = Some d\<rbrakk>
schirmer@12854
  1969
  \<Longrightarrow> table_of (methods d) sig  = Some (mthd m)"
schirmer@12854
  1970
proof -
schirmer@12854
  1971
  assume    wf: "wf_prog G"
schirmer@12854
  1972
  then have ws: "ws_prog G" ..
schirmer@12854
  1973
  assume  clsC: "class G C = Some c"
schirmer@12854
  1974
  from clsC ws 
schirmer@12854
  1975
  show "\<And> m d. \<lbrakk>methd G C sig = Some m; class G (declclass m) = Some d\<rbrakk>
schirmer@12854
  1976
        \<Longrightarrow> table_of (methods d) sig  = Some (mthd m)" 
schirmer@12854
  1977
         (is "PROP ?P C") 
schirmer@12854
  1978
  proof (induct ?P C rule: ws_class_induct)
schirmer@12854
  1979
    case Object
schirmer@12854
  1980
    fix m d
schirmer@12854
  1981
    assume "methd G Object sig = Some m" 
schirmer@12854
  1982
           "class G (declclass m) = Some d"
schirmer@12854
  1983
    with wf show "?thesis m d" by auto
schirmer@12854
  1984
  next
schirmer@12854
  1985
    case Subcls
schirmer@12854
  1986
    fix C c m d
schirmer@12854
  1987
    assume hyp: "PROP ?P (super c)"
schirmer@12854
  1988
    and      m: "methd G C sig = Some m"
schirmer@12854
  1989
    and  declC: "class G (declclass m) = Some d"
schirmer@12854
  1990
    and   clsC: "class G C = Some c"
schirmer@12854
  1991
    and   nObj: "C \<noteq> Object"
schirmer@12854
  1992
    let ?newMethods = "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c)) sig"
schirmer@12854
  1993
    show "?thesis m d" 
schirmer@12854
  1994
    proof (cases "?newMethods")
schirmer@12854
  1995
      case None
wenzelm@23350
  1996
      from None clsC nObj ws m declC
wenzelm@23350
  1997
      show "?thesis" by (auto simp add: methd_rec) (rule hyp)
schirmer@12854
  1998
    next
schirmer@12854
  1999
      case Some
wenzelm@23350
  2000
      from Some clsC nObj ws m declC
schirmer@12854
  2001
      show "?thesis" 
schirmer@12854
  2002
	by (auto simp add: methd_rec
schirmer@12854
  2003
                     dest: wf_prog_cdecl wf_cdecl_supD is_acc_class_is_class)
schirmer@12854
  2004
    qed
schirmer@12854
  2005
  qed
schirmer@12854
  2006
qed
schirmer@12854
  2007
schirmer@12854
  2008
(* Tactical version *)
schirmer@12854
  2009
(*
schirmer@12854
  2010
lemma declclassD[rule_format]:
schirmer@12854
  2011
 "wf_prog G \<longrightarrow>  
schirmer@12854
  2012
 (\<forall> c d m. class G C = Some c \<longrightarrow> methd G C sig = Some m \<longrightarrow> 
schirmer@12854
  2013
  class G (declclass m) = Some d
schirmer@12854
  2014
 \<longrightarrow> table_of (methods d) sig  = Some (mthd m))"
schirmer@12854
  2015
apply (rule class_rec.induct)
schirmer@12854
  2016
apply (rule impI)
schirmer@12854
  2017
apply (rule allI)+
schirmer@12854
  2018
apply (rule impI)
schirmer@12854
  2019
apply (case_tac "C=Object")
schirmer@12854
  2020
apply   (force simp add: methd_rec)
schirmer@12854
  2021
schirmer@12854
  2022
apply   (subst methd_rec)
schirmer@12854
  2023
apply     (blast dest: wf_ws_prog)+
schirmer@12854
  2024
apply   (case_tac "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c)) sig")
schirmer@12854
  2025
apply     (auto dest: wf_prog_cdecl wf_cdecl_supD is_acc_class_is_class)
schirmer@12854
  2026
done
schirmer@12854
  2027
*)
schirmer@12854
  2028
schirmer@12854
  2029
lemma dynmethd_Object:
wenzelm@12937
  2030
  assumes statM: "methd G Object sig = Some statM" and
schirmer@12854
  2031
        private: "accmodi statM = Private" and 
schirmer@12854
  2032
       is_cls_C: "is_class G C" and
schirmer@12854
  2033
             wf: "wf_prog G"
wenzelm@12937
  2034
  shows "dynmethd G Object C sig = Some statM"
schirmer@12854
  2035
proof -
schirmer@12854
  2036
  from is_cls_C wf 
schirmer@12854
  2037
  have subclseq: "G\<turnstile>C \<preceq>\<^sub>C Object" 
schirmer@12854
  2038
    by (auto intro: subcls_ObjectI)
schirmer@12854
  2039
  from wf have ws: "ws_prog G" 
schirmer@12854
  2040
    by simp
schirmer@12854
  2041
  from wf 
schirmer@12854
  2042
  have is_cls_Obj: "is_class G Object" 
schirmer@12854
  2043
    by simp
schirmer@12854
  2044
  from statM subclseq is_cls_Obj ws private
schirmer@12854
  2045
  show ?thesis
schirmer@12854
  2046
  proof (cases rule: dynmethd_cases)
schirmer@12854
  2047
    case Static then show ?thesis .
schirmer@12854
  2048
  next
schirmer@12854
  2049
    case Overrides 
schirmer@12854
  2050
    with private show ?thesis 
schirmer@12854
  2051
      by (auto dest: no_Private_override)
schirmer@12854
  2052
  qed
schirmer@12854
  2053
qed
schirmer@12854
  2054
schirmer@12854
  2055
lemma wf_imethds_hiding_objmethdsD: 
wenzelm@12937
  2056
  assumes     old: "methd G Object sig = Some old" and
wenzelm@12937
  2057
          is_if_I: "is_iface G I" and
wenzelm@12937
  2058
               wf: "wf_prog G" and    
wenzelm@12937
  2059
      not_private: "accmodi old \<noteq> Private" and
wenzelm@12937
  2060
              new: "new \<in> imethds G I sig" 
wenzelm@12937
  2061
  shows "G\<turnstile>resTy new\<preceq>resTy old \<and> is_static new = is_static old" (is "?P new")
schirmer@12854
  2062
proof -
schirmer@12854
  2063
  from wf have ws: "ws_prog G" by simp
schirmer@12854
  2064
  {
schirmer@12854
  2065
    fix I i new
schirmer@12854
  2066
    assume ifI: "iface G I = Some i"
schirmer@12854
  2067
    assume new: "table_of (imethods i) sig = Some new" 
schirmer@12854
  2068
    from ifI new not_private wf old  
schirmer@12854
  2069
    have "?P (I,new)"
schirmer@12854
  2070
      by (auto dest!: wf_prog_idecl wf_idecl_hiding cond_hiding_entailsD
schirmer@12854
  2071
            simp del: methd_Object)
schirmer@12854
  2072
  } note hyp_newmethod = this  
schirmer@12854
  2073
  from is_if_I ws new 
schirmer@12854
  2074
  show ?thesis
schirmer@12854
  2075
  proof (induct rule: ws_interface_induct)
schirmer@12854
  2076
    case (Step I i)
schirmer@12854
  2077
    assume ifI: "iface G I = Some i" 
schirmer@12854
  2078
    assume new: "new \<in> imethds G I sig" 
schirmer@12854
  2079
    from Step
schirmer@12854
  2080
    have hyp: "\<forall> J \<in> set (isuperIfs i). (new \<in> imethds G J sig \<longrightarrow> ?P new)"
schirmer@12854
  2081
      by auto 
schirmer@12854
  2082
    from new ifI ws
schirmer@12854
  2083
    show "?P new"
schirmer@12854
  2084
    proof (cases rule: imethds_cases)
schirmer@12854
  2085
      case NewMethod
schirmer@12854
  2086
      with ifI hyp_newmethod
schirmer@12854
  2087
      show ?thesis
schirmer@12854
  2088
	by auto
schirmer@12854
  2089
    next
schirmer@12854
  2090
      case (InheritedMethod J)
schirmer@12854
  2091
      assume "J \<in> set (isuperIfs i)" 
schirmer@12854
  2092
             "new \<in> imethds G J sig"
schirmer@12854
  2093
      with hyp 
schirmer@12854
  2094
      show "?thesis"
schirmer@12854
  2095
	by auto
schirmer@12854
  2096
    qed
schirmer@12854
  2097
  qed
schirmer@12854
  2098
qed
schirmer@12854
  2099
schirmer@12854
  2100
text {*
schirmer@12854
  2101
Which dynamic classes are valid to look up a member of a distinct static type?
schirmer@12854
  2102
We have to distinct class members (named static members in Java) 
schirmer@12854
  2103
from instance members. Class members are global to all Objects of a class,
schirmer@12854
  2104
instance members are local to a single Object instance. If a member is
schirmer@12854
  2105
equipped with the static modifier it is a class member, else it is an 
schirmer@12854
  2106
instance member.
schirmer@12854
  2107
The following table gives an overview of the current framework. We assume
schirmer@12854
  2108
to have a reference with static type statT and a dynamic class dynC. Between
schirmer@12854
  2109
both of these types the widening relation holds 
schirmer@12854
  2110
@{term "G\<turnstile>Class dynC\<preceq> statT"}. Unfortunately this ordinary widening relation 
schirmer@12854
  2111
isn't enough to describe the valid lookup classes, since we must cope the
schirmer@12854
  2112
special cases of arrays and interfaces,too. If we statically expect an array or
schirmer@12854
  2113
inteface we may lookup a field or a method in Object which isn't covered in 
schirmer@12854
  2114
the widening relation.
schirmer@12925
  2115
schirmer@12854
  2116
statT      field         instance method       static (class) method
schirmer@12854
  2117
------------------------------------------------------------------------
schirmer@12854
  2118
 NullT      /                  /                   /
schirmer@12854
  2119
 Iface      /                dynC                Object
schirmer@12854
  2120
 Class    dynC               dynC                 dynC
schirmer@12854
  2121
 Array      /                Object              Object
schirmer@12925
  2122
schirmer@12854
  2123
In most cases we con lookup the member in the dynamic class. But as an
schirmer@12854
  2124
interface can't declare new static methods, nor an array can define new
schirmer@12854
  2125
methods at all, we have to lookup methods in the base class Object.
schirmer@12854
  2126
schirmer@12854
  2127
The limitation to classes in the field column is artificial  and comes out
schirmer@12854
  2128
of the typing rule for the field access (see rule @{text "FVar"} in the 
schirmer@12854
  2129
welltyping relation @{term "wt"} in theory WellType). 
schirmer@12854
  2130
I stems out of the fact, that Object
schirmer@12854
  2131
indeed has no non private fields. So interfaces and arrays can actually
schirmer@12854
  2132
have no fields at all and a field access would be senseless. (In Java
schirmer@12854
  2133
interfaces are allowed to declare new fields but in current Bali not!).
schirmer@12854
  2134
So there is no principal reason why we should not allow Objects to declare
schirmer@12854
  2135
non private fields. Then we would get the following column:
schirmer@12925
  2136
       
schirmer@12854
  2137
 statT    field
schirmer@12854
  2138
----------------- 
schirmer@12854
  2139
 NullT      /  
schirmer@12854
  2140
 Iface    Object 
schirmer@12854
  2141
 Class    dynC 
schirmer@12854
  2142
 Array    Object
schirmer@12854
  2143
*}
schirmer@12854
  2144
consts valid_lookup_cls:: "prog \<Rightarrow> ref_ty \<Rightarrow> qtname \<Rightarrow> bool \<Rightarrow> bool"
schirmer@12854
  2145
                        ("_,_ \<turnstile> _ valid'_lookup'_cls'_for _" [61,61,61,61] 60)
schirmer@12854
  2146
primrec
schirmer@12854
  2147
"G,NullT    \<turnstile> dynC valid_lookup_cls_for static_membr = False"
schirmer@12854
  2148
"G,IfaceT I \<turnstile> dynC valid_lookup_cls_for static_membr 
schirmer@12854
  2149
              = (if static_membr 
schirmer@12854
  2150
                    then dynC=Object 
schirmer@12854
  2151
                    else G\<turnstile>Class dynC\<preceq> Iface I)"
schirmer@12854
  2152
"G,ClassT C \<turnstile> dynC valid_lookup_cls_for static_membr = G\<turnstile>Class dynC\<preceq> Class C"
schirmer@12854
  2153
"G,ArrayT T \<turnstile> dynC valid_lookup_cls_for static_membr = (dynC=Object)"
schirmer@12854
  2154
schirmer@12854
  2155
lemma valid_lookup_cls_is_class:
wenzelm@12937
  2156
  assumes dynC: "G,statT \<turnstile> dynC valid_lookup_cls_for static_membr" and
schirmer@12854
  2157
      ty_statT: "isrtype G statT" and
schirmer@12854
  2158
            wf: "wf_prog G"
wenzelm@12937
  2159
  shows "is_class G dynC"
schirmer@12854
  2160
proof (cases statT)
schirmer@12854
  2161
  case NullT
schirmer@12854
  2162
  with dynC ty_statT show ?thesis
schirmer@12854
  2163
    by (auto dest: widen_NT2)
schirmer@12854
  2164
next
schirmer@12854
  2165
  case (IfaceT I)
schirmer@12854
  2166
  with dynC wf show ?thesis
schirmer@12854
  2167
    by (auto dest: implmt_is_class)
schirmer@12854
  2168
next
schirmer@12854
  2169
  case (ClassT C)
schirmer@12854
  2170
  with dynC ty_statT show ?thesis
schirmer@12854
  2171
    by (auto dest: subcls_is_class2)
schirmer@12854
  2172
next
schirmer@12854
  2173
  case (ArrayT T)
schirmer@12854
  2174
  with dynC wf show ?thesis
schirmer@12854
  2175
    by (auto)
schirmer@12854
  2176
qed
schirmer@12854
  2177
schirmer@12854
  2178
declare split_paired_All [simp del] split_paired_Ex [simp del]
wenzelm@24019
  2179
declaration {* K (Simplifier.map_ss (fn ss => ss delloop "split_all_tac")) *}
wenzelm@24019
  2180
declaration {* K (Classical.map_cs (fn cs => cs delSWrapper "split_all_tac")) *}
wenzelm@24019
  2181
schirmer@12854
  2182
lemma dynamic_mheadsD:   
schirmer@12854
  2183
"\<lbrakk>emh \<in> mheads G S statT sig;    
schirmer@12854
  2184
  G,statT \<turnstile> dynC valid_lookup_cls_for (is_static emh);
schirmer@12854
  2185
  isrtype G statT; wf_prog G
schirmer@12854
  2186
 \<rbrakk> \<Longrightarrow> \<exists>m \<in> dynlookup G statT dynC sig: 
schirmer@12854
  2187
          is_static m=is_static emh \<and> G\<turnstile>resTy m\<preceq>resTy emh"
schirmer@12854
  2188
proof - 
schirmer@12854
  2189
  assume      emh: "emh \<in> mheads G S statT sig"
schirmer@12854
  2190
  and          wf: "wf_prog G"
schirmer@12854
  2191
  and   dynC_Prop: "G,statT \<turnstile> dynC valid_lookup_cls_for (is_static emh)"
schirmer@12854
  2192
  and      istype: "isrtype G statT"
schirmer@12854
  2193
  from dynC_Prop istype wf 
schirmer@12854
  2194
  obtain y where
schirmer@12854
  2195
    dynC: "class G dynC = Some y" 
schirmer@12854
  2196
    by (auto dest: valid_lookup_cls_is_class)
schirmer@12854
  2197
  from emh wf show ?thesis
schirmer@12854
  2198
  proof (cases rule: mheads_cases)
schirmer@12854
  2199
    case Class_methd
schirmer@12854
  2200
    fix statC statDeclC sm
schirmer@12854
  2201
    assume     statC: "statT = ClassT statC"
schirmer@12854
  2202
    assume            "accmethd G S statC sig = Some sm"
schirmer@12854
  2203
    then have     sm: "methd G statC sig = Some sm" 
schirmer@12854
  2204
      by (blast dest: accmethd_SomeD)  
schirmer@12854
  2205
    assume eq_mheads: "mhead (mthd sm) = mhd emh"
schirmer@12854
  2206
    from statC 
schirmer@12854
  2207
    have dynlookup: "dynlookup G statT dynC sig = dynmethd G statC dynC sig"
schirmer@12854
  2208
      by (simp add: dynlookup_def)
schirmer@12854
  2209
    from wf statC istype dynC_Prop sm 
schirmer@12854
  2210
    obtain dm where
schirmer@12854
  2211
      "dynmethd G statC dynC sig = Some dm"
schirmer@12854
  2212
      "is_static dm = is_static sm" 
schirmer@12854
  2213
      "G\<turnstile>resTy dm\<preceq>resTy sm"  
schirmer@12925
  2214
      by (force dest!: ws_dynmethd accmethd_SomeD)
schirmer@12854
  2215
    with dynlookup eq_mheads 
schirmer@12854
  2216
    show ?thesis 
schirmer@12854
  2217
      by (cases emh type: *) (auto)
schirmer@12854
  2218
  next
schirmer@12854
  2219
    case Iface_methd
schirmer@12854
  2220
    fix I im
schirmer@12854
  2221
    assume    statI: "statT = IfaceT I" and
schirmer@12854
  2222
          eq_mheads: "mthd im = mhd emh" and
schirmer@12854
  2223
                     "im \<in> accimethds G (pid S) I sig" 
schirmer@12854
  2224
    then have im: "im \<in> imethds G I sig" 
schirmer@12854
  2225
      by (blast dest: accimethdsD)
schirmer@12854
  2226
    with istype statI eq_mheads wf 
schirmer@12854
  2227
    have not_static_emh: "\<not> is_static emh"
schirmer@12854
  2228
      by (cases emh) (auto dest: wf_prog_idecl imethds_wf_mhead)
schirmer@12854
  2229
    from statI im
schirmer@12854
  2230
    have dynlookup: "dynlookup G statT dynC sig = methd G dynC sig"
schirmer@12854
  2231
      by (auto simp add: dynlookup_def dynimethd_def) 
schirmer@12854
  2232
    from wf dynC_Prop statI istype im not_static_emh 
schirmer@12854
  2233
    obtain dm where
schirmer@12854
  2234
      "methd G dynC sig = Some dm"
schirmer@12854
  2235
      "is_static dm = is_static im" 
schirmer@12854
  2236
      "G\<turnstile>resTy (mthd dm)\<preceq>resTy (mthd im)" 
schirmer@12925
  2237
      by (force dest: implmt_methd)
schirmer@12854
  2238
    with dynlookup eq_mheads
schirmer@12854
  2239
    show ?thesis 
schirmer@12854
  2240
      by (cases emh type: *) (auto)
schirmer@12854
  2241
  next
schirmer@12854
  2242
    case Iface_Object_methd
schirmer@12854
  2243
    fix I sm
schirmer@12854
  2244
    assume   statI: "statT = IfaceT I" and
schirmer@12854
  2245
                sm: "accmethd G S Object sig = Some sm" and 
schirmer@12854
  2246
         eq_mheads: "mhead (mthd sm) = mhd emh" and
schirmer@12854
  2247
             nPriv: "accmodi sm \<noteq> Private"
schirmer@12854
  2248
     show ?thesis 
schirmer@12854
  2249
     proof (cases "imethds G I sig = {}")
schirmer@12854
  2250
       case True
schirmer@12854
  2251
       with statI 
schirmer@12854
  2252
       have dynlookup: "dynlookup G statT dynC sig = dynmethd G Object dynC sig"
schirmer@12854
  2253
	 by (simp add: dynlookup_def dynimethd_def)
schirmer@12854
  2254
       from wf dynC 
schirmer@12854
  2255
       have subclsObj: "G\<turnstile>dynC \<preceq>\<^sub>C Object"
schirmer@12854
  2256
	 by (auto intro: subcls_ObjectI)
schirmer@12854
  2257
       from wf dynC dynC_Prop istype sm subclsObj 
schirmer@12854
  2258
       obtain dm where
schirmer@12854
  2259
	 "dynmethd G Object dynC sig = Some dm"
schirmer@12854
  2260
	 "is_static dm = is_static sm" 
schirmer@12854
  2261
	 "G\<turnstile>resTy (mthd dm)\<preceq>resTy (mthd sm)"  
schirmer@12854
  2262
	 by (auto dest!: ws_dynmethd accmethd_SomeD 
schirmer@12925
  2263
                  intro: class_Object [OF wf] intro: that)
schirmer@12854
  2264
       with dynlookup eq_mheads
schirmer@12854
  2265
       show ?thesis 
schirmer@12854
  2266
	 by (cases emh type: *) (auto)
schirmer@12854
  2267
     next
schirmer@12854
  2268
       case False
schirmer@12854
  2269
       with statI
schirmer@12854
  2270
       have dynlookup: "dynlookup G statT dynC sig = methd G dynC sig"
schirmer@12854
  2271
	 by (simp add: dynlookup_def dynimethd_def)
schirmer@12854
  2272
       from istype statI
schirmer@12854
  2273
       have "is_iface G I"
schirmer@12854
  2274
	 by auto
schirmer@12854
  2275
       with wf sm nPriv False 
schirmer@12854
  2276
       obtain im where
schirmer@12854
  2277
	      im: "im \<in> imethds G I sig" and
schirmer@12854
  2278
	 eq_stat: "is_static im = is_static sm" and
schirmer@12854
  2279
         resProp: "G\<turnstile>resTy (mthd im)\<preceq>resTy (mthd sm)"
schirmer@12854
  2280
	 by (auto dest: wf_imethds_hiding_objmethdsD accmethd_SomeD)
schirmer@12854
  2281
       from im wf statI istype eq_stat eq_mheads
schirmer@12854
  2282
       have not_static_sm: "\<not> is_static emh"
schirmer@12854
  2283
	 by (cases emh) (auto dest: wf_prog_idecl imethds_wf_mhead)
schirmer@12854
  2284
       from im wf dynC_Prop dynC istype statI not_static_sm
schirmer@12854
  2285
       obtain dm where
schirmer@12854
  2286
	 "methd G dynC sig = Some dm"
schirmer@12854
  2287
	 "is_static dm = is_static im" 
schirmer@12854
  2288
	 "G\<turnstile>resTy (mthd dm)\<preceq>resTy (mthd im)" 
schirmer@12854
  2289
	 by (auto dest: implmt_methd)
schirmer@12854
  2290
       with wf eq_stat resProp dynlookup eq_mheads
schirmer@12854
  2291
       show ?thesis 
schirmer@12854
  2292
	 by (cases emh type: *) (auto intro: widen_trans)
schirmer@12854
  2293
     qed
schirmer@12854
  2294
  next
schirmer@12854
  2295
    case Array_Object_methd
schirmer@12854
  2296
    fix T sm
schirmer@12854
  2297
    assume statArr: "statT = ArrayT T" and
schirmer@12854
  2298
                sm: "accmethd G S Object sig = Some sm" and 
schirmer@12854
  2299
         eq_mheads: "mhead (mthd sm) = mhd emh" 
schirmer@12854
  2300
    from statArr dynC_Prop wf
schirmer@12854
  2301
    have dynlookup: "dynlookup G statT dynC sig = methd G Object sig"
schirmer@12854
  2302
      by (auto simp add: dynlookup_def dynmethd_C_C)
schirmer@12854
  2303
    with sm eq_mheads sm 
schirmer@12854
  2304
    show ?thesis 
schirmer@12854
  2305
      by (cases emh type: *) (auto dest: accmethd_SomeD)
schirmer@12854
  2306
  qed
schirmer@12854
  2307
qed
schirmer@12925
  2308
declare split_paired_All [simp] split_paired_Ex [simp]
wenzelm@24019
  2309
declaration {* K (Classical.map_cs (fn cs => cs addSbefore ("split_all_tac", split_all_tac))) *}
wenzelm@24019
  2310
declaration {* K (Simplifier.map_ss (fn ss => ss addloop ("split_all_tac", split_all_tac))) *}
schirmer@12854
  2311
schirmer@12854
  2312
(* Tactical version *)
schirmer@12854
  2313
(*
schirmer@12854
  2314
lemma dynamic_mheadsD: "  
schirmer@12854
  2315
 \<lbrakk>emh \<in> mheads G S statT sig; wf_prog G; class G dynC = Some y;  
schirmer@12854
  2316
   if (\<exists>T. statT=ArrayT T) then dynC=Object else G\<turnstile>Class dynC\<preceq>RefT statT; 
schirmer@12854
  2317
   isrtype G statT\<rbrakk> \<Longrightarrow>  
schirmer@12854
  2318
  \<exists>m \<in> dynlookup G statT dynC sig: 
schirmer@12854
  2319
     static (mthd m)=static (mhd emh) \<and> G\<turnstile>resTy (mthd m)\<preceq>resTy (mhd emh)"
schirmer@12854
  2320
apply (drule mheadsD)
schirmer@12854
  2321
apply safe
schirmer@12854
  2322
       -- reftype statT is a class  
schirmer@12854
  2323
apply  (case_tac "\<exists>T. ClassT C = ArrayT T")
schirmer@12854
  2324
apply    (simp)
schirmer@12854
  2325
schirmer@12854
  2326
apply    (clarsimp simp add: dynlookup_def )
schirmer@12854
  2327
apply    (frule_tac statC="C" and dynC="dynC"  and sig="sig"  
schirmer@12854
  2328
         in ws_dynmethd)
schirmer@12854
  2329
apply      assumption+
schirmer@12854
  2330
apply    (case_tac "emh")  
schirmer@12854
  2331
apply    (force dest: accmethd_SomeD)
schirmer@12854
  2332
schirmer@12854
  2333
       -- reftype statT is a interface, method defined in interface 
schirmer@12854
  2334
apply    (clarsimp simp add: dynlookup_def)
schirmer@12854
  2335
apply    (drule (1) implmt_methd)
schirmer@12854
  2336
apply      blast
schirmer@12854
  2337
apply      blast
schirmer@12854
  2338
apply    (clarify)  
schirmer@12854
  2339
apply    (unfold dynimethd_def)
schirmer@12854
  2340
apply    (rule_tac x="cm" in bexI)
schirmer@12854
  2341
apply      (case_tac "emh")
schirmer@12854
  2342
apply      force
schirmer@12854
  2343
schirmer@12854
  2344
apply      force
schirmer@12854
  2345
schirmer@12854
  2346
        -- reftype statT is a interface, method defined in Object 
schirmer@12854
  2347
apply    (simp add: dynlookup_def)
schirmer@12854
  2348
apply    (simp only: dynimethd_def)
schirmer@12854
  2349
apply    (case_tac "imethds G I sig = {}")
schirmer@12854
  2350
apply       simp
schirmer@12854
  2351
apply       (frule_tac statC="Object" and dynC="dynC"  and sig="sig"  
schirmer@12854
  2352
             in ws_dynmethd)
schirmer@12854
  2353
apply          (blast intro: subcls_ObjectI wf_ws_prog) 
schirmer@12854
  2354
apply          (blast dest: class_Object)
schirmer@12854
  2355
apply       (case_tac "emh") 
schirmer@12854
  2356
apply       (force dest: accmethd_SomeD)
schirmer@12854
  2357
schirmer@12854
  2358
apply       simp
schirmer@12854
  2359
apply       (subgoal_tac "\<exists> im. im \<in> imethds G I sig") 
schirmer@12854
  2360
prefer 2      apply blast
schirmer@12854
  2361
apply       clarify
schirmer@12854
  2362
apply       (frule (1) implmt_methd)
schirmer@12854
  2363
apply         simp
schirmer@12854
  2364
apply         blast  
schirmer@12854
  2365
apply       (clarify dest!: accmethd_SomeD)
schirmer@12854
  2366
apply       (frule (4) iface_overrides_Object)
schirmer@12854
  2367
apply       clarify
schirmer@12854
  2368
apply       (case_tac emh)
schirmer@12854
  2369
apply       force
schirmer@12854
  2370
schirmer@12854
  2371
        -- reftype statT is a array
schirmer@12854
  2372
apply    (simp add: dynlookup_def)
schirmer@12854
  2373
apply    (case_tac emh)
schirmer@12854
  2374
apply    (force dest: accmethd_SomeD simp add: dynmethd_def)
schirmer@12854
  2375
done
schirmer@12854
  2376
*)
schirmer@12854
  2377
schirmer@12925
  2378
(* FIXME occasionally convert to ws_class_induct*) 
schirmer@12854
  2379
lemma methd_declclass:
schirmer@12854
  2380
"\<lbrakk>class G C = Some c; wf_prog G; methd G C sig = Some m\<rbrakk> 
schirmer@12854
  2381
 \<Longrightarrow> methd G (declclass m) sig = Some m"
schirmer@12854
  2382
proof -
schirmer@12854
  2383
  assume asm: "class G C = Some c" "wf_prog G" "methd G C sig = Some m"
schirmer@12854
  2384
  have "wf_prog G  \<longrightarrow> 
schirmer@12854
  2385
	   (\<forall> c m. class G C = Some c \<longrightarrow>  methd G C sig = Some m 
schirmer@12854
  2386
                   \<longrightarrow>  methd G (declclass m) sig = Some m)"      (is "?P G C") 
schirmer@12854
  2387
  proof (rule class_rec.induct,intro allI impI)
schirmer@12854
  2388
    fix G C c m
schirmer@12854
  2389
    assume hyp: "\<forall>c. C \<noteq> Object \<and> ws_prog G \<and> class G C = Some c \<longrightarrow>
schirmer@12854
  2390
                     ?P G (super c)"
schirmer@12854
  2391
    assume wf: "wf_prog G" and cls_C: "class G C = Some c" and
schirmer@12854
  2392
            m: "methd G C sig = Some m"
schirmer@12854
  2393
    show "methd G (declclass m) sig = Some m"
schirmer@12854
  2394
    proof (cases "C=Object")
schirmer@12854
  2395
      case True
schirmer@12854
  2396
      with wf m show ?thesis by (auto intro: table_of_map_SomeI)
schirmer@12854
  2397
    next
schirmer@12854
  2398
      let ?filter="filter_tab (\<lambda>sig m. G\<turnstile>C inherits method sig m)"
schirmer@12854
  2399
      let ?table = "table_of (map (\<lambda>(s, m). (s, C, m)) (methods c))"
schirmer@12854
  2400
      case False
schirmer@12854
  2401
      with cls_C wf m
schirmer@12854
  2402
      have methd_C: "(?filter (methd G (super c)) ++ ?table) sig = Some m "
schirmer@12854
  2403
	by (simp add: methd_rec)
schirmer@12854
  2404
      show ?thesis
schirmer@12854
  2405
      proof (cases "?table sig")
schirmer@12854
  2406
	case None
schirmer@12854
  2407
	from this methd_C have "?filter (methd G (super c)) sig = Some m"
schirmer@12854
  2408
	  by simp
schirmer@12854
  2409
	moreover
schirmer@12854
  2410
	from wf cls_C False obtain sup where "class G (super c) = Some sup"
schirmer@12854
  2411
	  by (blast dest: wf_prog_cdecl wf_cdecl_supD is_acc_class_is_class)
schirmer@12925
  2412
	moreover note wf False cls_C 
schirmer@12925
  2413
	ultimately show ?thesis by (auto intro: hyp [rule_format])
schirmer@12854
  2414
      next
schirmer@12854
  2415
	case Some
schirmer@12854
  2416
	from this methd_C m show ?thesis by auto 
schirmer@12854
  2417
      qed
schirmer@12854
  2418
    qed
schirmer@12854
  2419
  qed	
schirmer@12854
  2420
  with asm show ?thesis by auto
schirmer@12854
  2421
qed
schirmer@12854
  2422
schirmer@12854
  2423
lemma dynmethd_declclass:
schirmer@12854
  2424
 "\<lbrakk>dynmethd G statC dynC sig = Some m;
schirmer@12854
  2425
   wf_prog G; is_class G statC
schirmer@12854
  2426
  \<rbrakk> \<Longrightarrow> methd G (declclass m) sig = Some m"
schirmer@12854
  2427
by (auto dest: dynmethd_declC)
schirmer@12854
  2428
schirmer@12854
  2429
lemma dynlookup_declC:
schirmer@12854
  2430
 "\<lbrakk>dynlookup G statT dynC sig = Some m; wf_prog G;
schirmer@12854
  2431
   is_class G dynC;isrtype G statT
schirmer@12854
  2432
  \<rbrakk> \<Longrightarrow> G\<turnstile>dynC \<preceq>\<^sub>C (declclass m) \<and> is_class G (declclass m)"
schirmer@12854
  2433
by (cases "statT")
schirmer@12854
  2434
   (auto simp add: dynlookup_def dynimethd_def 
schirmer@12854
  2435
             dest: methd_declC dynmethd_declC)
schirmer@12854
  2436
schirmer@12854
  2437
lemma dynlookup_Array_declclassD [simp]:
schirmer@12854
  2438
"\<lbrakk>dynlookup G (ArrayT T) Object sig = Some dm;wf_prog G\<rbrakk> 
schirmer@12854
  2439
 \<Longrightarrow> declclass dm = Object"
schirmer@12854
  2440
proof -
schirmer@12854
  2441
  assume dynL: "dynlookup G (ArrayT T) Object sig = Some dm"
schirmer@12854
  2442
  assume wf: "wf_prog G"
schirmer@12854
  2443
  from wf have ws: "ws_prog G" by auto
schirmer@12854
  2444
  from wf have is_cls_Obj: "is_class G Object" by auto
schirmer@12854
  2445
  from dynL wf
schirmer@12854
  2446
  show ?thesis
schirmer@12854
  2447
    by (auto simp add: dynlookup_def dynmethd_C_C [OF is_cls_Obj ws]
schirmer@12854
  2448
                 dest: methd_Object_SomeD)
schirmer@12854
  2449
qed   
schirmer@12854
  2450
  
schirmer@12925
  2451
schirmer@12854
  2452
declare split_paired_All [simp del] split_paired_Ex [simp del]
wenzelm@24019
  2453
declaration {* K (Simplifier.map_ss (fn ss => ss delloop "split_all_tac")) *}
wenzelm@24019
  2454
declaration {* K (Classical.map_cs (fn cs => cs delSWrapper "split_all_tac")) *}
wenzelm@24019
  2455
schirmer@12854
  2456
lemma wt_is_type: "E,dt\<Turnstile>v\<Colon>T \<Longrightarrow>  wf_prog (prg E) \<longrightarrow> 
schirmer@12854
  2457
  dt=empty_dt \<longrightarrow> (case T of 
schirmer@12854
  2458
                     Inl T \<Rightarrow> is_type (prg E) T 
schirmer@12854
  2459
                   | Inr Ts \<Rightarrow> Ball (set Ts) (is_type (prg E)))"
schirmer@12854
  2460
apply (unfold empty_dt_def)
schirmer@12854
  2461
apply (erule wt.induct)
schirmer@12854
  2462
apply (auto split del: split_if_asm simp del: snd_conv 
schirmer@12854
  2463
            simp add: is_acc_class_def is_acc_type_def)
schirmer@12854
  2464
apply    (erule typeof_empty_is_type)
schirmer@13688
  2465
apply   (frule (1) wf_prog_cdecl [THEN wf_cdecl_supD], 
schirmer@12854
  2466
        force simp del: snd_conv, clarsimp simp add: is_acc_class_def)
schirmer@12854
  2467
apply  (drule (1) max_spec2mheads [THEN conjunct1, THEN mheadsD])
schirmer@12854
  2468
apply  (drule_tac [2] accfield_fields) 
schirmer@12854
  2469
apply  (frule class_Object)
schirmer@12854
  2470
apply  (auto dest: accmethd_rT_is_type 
schirmer@12854
  2471
                   imethds_wf_mhead [THEN conjunct1, THEN rT_is_acc_type]
schirmer@12854
  2472
             dest!:accimethdsD
schirmer@12854
  2473
             simp del: class_Object
schirmer@12854
  2474
             simp add: is_acc_type_def
schirmer@12854
  2475
    )
schirmer@12854
  2476
done
schirmer@12854
  2477
declare split_paired_All [simp] split_paired_Ex [simp]
wenzelm@24019
  2478
declaration {* K (Classical.map_cs (fn cs => cs addSbefore ("split_all_tac", split_all_tac))) *}
wenzelm@24019
  2479
declaration {* K (Simplifier.map_ss (fn ss => ss addloop ("split_all_tac", split_all_tac))) *}
schirmer@12854
  2480
schirmer@12854
  2481
lemma ty_expr_is_type: 
schirmer@12854
  2482
"\<lbrakk>E\<turnstile>e\<Colon>-T; wf_prog (prg E)\<rbrakk> \<Longrightarrow> is_type (prg E) T"
schirmer@12854
  2483
by (auto dest!: wt_is_type)
schirmer@12854
  2484
lemma ty_var_is_type: 
schirmer@12854
  2485
"\<lbrakk>E\<turnstile>v\<Colon>=T; wf_prog (prg E)\<rbrakk> \<Longrightarrow> is_type (prg E) T"
schirmer@12854
  2486
by (auto dest!: wt_is_type)
schirmer@12854
  2487
lemma ty_exprs_is_type: 
schirmer@12854
  2488
"\<lbrakk>E\<turnstile>es\<Colon>\<doteq>Ts; wf_prog (prg E)\<rbrakk> \<Longrightarrow> Ball (set Ts) (is_type (prg E))"
schirmer@12854
  2489
by (auto dest!: wt_is_type)
schirmer@12854
  2490
schirmer@12854
  2491
schirmer@12854
  2492
lemma static_mheadsD: 
schirmer@12854
  2493
 "\<lbrakk> emh \<in> mheads G S t sig; wf_prog G; E\<turnstile>e\<Colon>-RefT t; prg E=G ; 
schirmer@12854
  2494
   invmode (mhd emh) e \<noteq> IntVir 
schirmer@12854
  2495
  \<rbrakk> \<Longrightarrow> \<exists>m. (   (\<exists> C. t = ClassT C \<and> accmethd G S C sig = Some m)
schirmer@12854
  2496
               \<or> (\<forall> C. t \<noteq> ClassT C \<and> accmethd G S Object sig = Some m )) \<and> 
schirmer@12854
  2497
          declrefT emh = ClassT (declclass m) \<and>  mhead (mthd m) = (mhd emh)"
schirmer@12854
  2498
apply (subgoal_tac "is_static emh \<or> e = Super")
schirmer@12854
  2499
defer apply (force simp add: invmode_def)
schirmer@12854
  2500
apply (frule  ty_expr_is_type)
schirmer@12854
  2501
apply   simp
schirmer@12854
  2502
apply (case_tac "is_static emh")
schirmer@12854
  2503
apply  (frule (1) mheadsD)
schirmer@12854
  2504
apply  clarsimp
schirmer@12854
  2505
apply  safe
schirmer@12854
  2506
apply    blast
schirmer@12854
  2507
apply   (auto dest!: imethds_wf_mhead
schirmer@12854
  2508
                     accmethd_SomeD 
schirmer@12854
  2509
                     accimethdsD
schirmer@12854
  2510
              simp add: accObjectmheads_def Objectmheads_def)
schirmer@12854
  2511
schirmer@12854
  2512
apply  (erule wt_elim_cases)
schirmer@12854
  2513
apply  (force simp add: cmheads_def)
schirmer@12854
  2514
done
schirmer@12854
  2515
schirmer@12854
  2516
lemma wt_MethdI:  
schirmer@12854
  2517
"\<lbrakk>methd G C sig = Some m; wf_prog G;  
schirmer@12854
  2518
  class G C = Some c\<rbrakk> \<Longrightarrow>  
schirmer@12854
  2519
 \<exists>T. \<lparr>prg=G,cls=(declclass m),
schirmer@13688
  2520
      lcl=callee_lcl (declclass m) sig (mthd m)\<rparr>\<turnstile> Methd C sig\<Colon>-T \<and> G\<turnstile>T\<preceq>resTy m"
schirmer@12854
  2521
apply (frule (2) methd_wf_mdecl, clarify)
schirmer@12854
  2522
apply (force dest!: wf_mdecl_bodyD intro!: wt.Methd)
schirmer@12854
  2523
done
schirmer@12854
  2524
schirmer@12854
  2525
subsection "accessibility concerns"
schirmer@12854
  2526
schirmer@12854
  2527
lemma mheads_type_accessible:
schirmer@12854
  2528
 "\<lbrakk>emh \<in> mheads G S T sig; wf_prog G\<rbrakk>
schirmer@12854
  2529
 \<Longrightarrow> G\<turnstile>RefT T accessible_in (pid S)"
schirmer@12854
  2530
by (erule mheads_cases)
schirmer@12854
  2531
   (auto dest: accmethd_SomeD accessible_from_commonD accimethdsD)
schirmer@12854
  2532
schirmer@12925
  2533
lemma static_to_dynamic_accessible_from_aux:
schirmer@12854
  2534
"\<lbrakk>G\<turnstile>m of C accessible_from accC;wf_prog G\<rbrakk> 
schirmer@12854
  2535
 \<Longrightarrow> G\<turnstile>m in C dyn_accessible_from accC"
schirmer@12854
  2536
proof (induct rule: accessible_fromR.induct)
schirmer@12854
  2537
qed (auto intro: dyn_accessible_fromR.intros 
schirmer@12854
  2538
                 member_of_to_member_in
schirmer@12854
  2539
                 static_to_dynamic_overriding)
schirmer@12854
  2540
schirmer@12854
  2541
lemma static_to_dynamic_accessible_from:
wenzelm@12937
  2542
  assumes stat_acc: "G\<turnstile>m of statC accessible_from accC" and
schirmer@12854
  2543
          subclseq: "G\<turnstile>dynC \<preceq>\<^sub>C statC" and
schirmer@12854
  2544
                wf: "wf_prog G"
wenzelm@12937
  2545
  shows "G\<turnstile>m in dynC dyn_accessible_from accC"
schirmer@12854
  2546
proof - 
schirmer@12854
  2547
  from stat_acc subclseq 
schirmer@12854
  2548
  show ?thesis (is "?Dyn_accessible m")
schirmer@12854
  2549
  proof (induct rule: accessible_fromR.induct)
berghofe@21765
  2550
    case (Immediate m statC)
schirmer@12854
  2551
    then show "?Dyn_accessible m"
schirmer@12925
  2552
      by (blast intro: dyn_accessible_fromR.Immediate
schirmer@12854
  2553
                       member_inI
schirmer@12854
  2554
                       permits_acc_inheritance)
schirmer@12854
  2555
  next
berghofe@21765
  2556
    case (Overriding m _ _)
schirmer@12854
  2557
    with wf show "?Dyn_accessible m"
schirmer@12925
  2558
      by (blast intro: dyn_accessible_fromR.Overriding
schirmer@12854
  2559
                       member_inI
schirmer@12854
  2560
                       static_to_dynamic_overriding  
schirmer@12854
  2561
                       rtrancl_trancl_trancl 
schirmer@12925
  2562
                       static_to_dynamic_accessible_from_aux)
schirmer@12854
  2563
  qed
schirmer@12854
  2564
qed
schirmer@12854
  2565
schirmer@12925
  2566
lemma static_to_dynamic_accessible_from_static:
wenzelm@12937
  2567
  assumes stat_acc: "G\<turnstile>m of statC accessible_from accC" and
schirmer@12925
  2568
            static: "is_static m" and
schirmer@12925
  2569
                wf: "wf_prog G"
wenzelm@12937
  2570
  shows "G\<turnstile>m in (declclass m) dyn_accessible_from accC"
schirmer@12925
  2571
proof -
schirmer@12925
  2572
  from stat_acc wf 
schirmer@12925
  2573
  have "G\<turnstile>m in statC dyn_accessible_from accC"
schirmer@12925
  2574
    by (auto intro: static_to_dynamic_accessible_from)
schirmer@12925
  2575
  from this static
schirmer@12925
  2576
  show ?thesis
schirmer@12925
  2577
    by (rule dyn_accessible_from_static_declC)