src/HOL/MicroJava/J/TypeRel.thy
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(*  Title:      HOL/MicroJava/J/TypeRel.thy
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    ID:         $Id$
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    Author:     David von Oheimb
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    Copyright   1999 Technische Universitaet Muenchen
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*)
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header "Relations between Java Types"
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theory TypeRel = Decl:
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consts
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  subcls1 :: "'c prog => (cname \<times> cname) set"  -- "subclass"
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  widen   :: "'c prog => (ty    \<times> ty   ) set"  -- "widening"
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  cast    :: "'c prog => (cname \<times> cname) set"  -- "casting"
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syntax (xsymbols)
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  subcls1 :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<prec>C1 _" [71,71,71] 70)
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  subcls  :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<preceq>C _"  [71,71,71] 70)
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  widen   :: "'c prog => [ty   , ty   ] => bool" ("_ \<turnstile> _ \<preceq> _"   [71,71,71] 70)
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  cast    :: "'c prog => [cname, cname] => bool" ("_ \<turnstile> _ \<preceq>? _"  [71,71,71] 70)
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syntax
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  subcls1 :: "'c prog => [cname, cname] => bool" ("_ |- _ <=C1 _" [71,71,71] 70)
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  subcls  :: "'c prog => [cname, cname] => bool" ("_ |- _ <=C _"  [71,71,71] 70)
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  widen   :: "'c prog => [ty   , ty   ] => bool" ("_ |- _ <= _"   [71,71,71] 70)
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  cast    :: "'c prog => [cname, cname] => bool" ("_ |- _ <=? _"  [71,71,71] 70)
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translations
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  "G\<turnstile>C \<prec>C1 D" == "(C,D) \<in> subcls1 G"
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  "G\<turnstile>C \<preceq>C  D" == "(C,D) \<in> (subcls1 G)^*"
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  "G\<turnstile>S \<preceq>   T" == "(S,T) \<in> widen   G"
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  "G\<turnstile>C \<preceq>?  D" == "(C,D) \<in> cast    G"
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-- "direct subclass, cf. 8.1.3"
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inductive "subcls1 G" intros
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  subcls1I: "\<lbrakk>class G C = Some (D,rest); C \<noteq> Object\<rbrakk> \<Longrightarrow> G\<turnstile>C\<prec>C1D"
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lemma subcls1D: 
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  "G\<turnstile>C\<prec>C1D \<Longrightarrow> C \<noteq> Object \<and> (\<exists>fs ms. class G C = Some (D,fs,ms))"
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apply (erule subcls1.elims)
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apply auto
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done
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lemma subcls1_def2: 
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"subcls1 G = (\<Sigma>C\<in>{C. is_class G C} . {D. C\<noteq>Object \<and> fst (the (class G C))=D})"
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  by (auto simp add: is_class_def dest: subcls1D intro: subcls1I)
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lemma finite_subcls1: "finite (subcls1 G)"
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apply(subst subcls1_def2)
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apply(rule finite_SigmaI [OF finite_is_class])
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apply(rule_tac B = "{fst (the (class G C))}" in finite_subset)
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apply  auto
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done
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lemma subcls_is_class: "(C,D) \<in> (subcls1 G)^+ ==> is_class G C"
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apply (unfold is_class_def)
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apply(erule trancl_trans_induct)
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apply (auto dest!: subcls1D)
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done
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lemma subcls_is_class2 [rule_format (no_asm)]: 
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  "G\<turnstile>C\<preceq>C D \<Longrightarrow> is_class G D \<longrightarrow> is_class G C"
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apply (unfold is_class_def)
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apply (erule rtrancl_induct)
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apply  (drule_tac [2] subcls1D)
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apply  auto
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done
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consts class_rec ::"'c prog \<times> cname \<Rightarrow> 
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        'a \<Rightarrow> (cname \<Rightarrow> fdecl list \<Rightarrow> 'c mdecl list \<Rightarrow> 'a \<Rightarrow> 'a) \<Rightarrow> 'a"
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recdef class_rec "same_fst (\<lambda>G. wf ((subcls1 G)^-1)) (\<lambda>G. (subcls1 G)^-1)"
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      "class_rec (G,C) = (\<lambda>t f. case class G C of None \<Rightarrow> arbitrary 
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                         | Some (D,fs,ms) \<Rightarrow> if wf ((subcls1 G)^-1) then 
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      f C fs ms (if C = Object then t else class_rec (G,D) t f) else arbitrary)"
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(hints intro: subcls1I)
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declare class_rec.simps [simp del]
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lemma class_rec_lemma: "\<lbrakk> wf ((subcls1 G)^-1); class G C = Some (D,fs,ms)\<rbrakk> \<Longrightarrow>
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 class_rec (G,C) t f = f C fs ms (if C=Object then t else class_rec (G,D) t f)";
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  apply (rule class_rec.simps [THEN trans [THEN fun_cong [THEN fun_cong]]])
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  apply simp
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  done
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consts
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  method :: "'c prog \<times> cname => ( sig   \<leadsto> cname \<times> ty \<times> 'c)" (* ###curry *)
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  field  :: "'c prog \<times> cname => ( vname \<leadsto> cname \<times> ty     )" (* ###curry *)
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  fields :: "'c prog \<times> cname => ((vname \<times> cname) \<times> ty) list" (* ###curry *)
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-- "methods of a class, with inheritance, overriding and hiding, cf. 8.4.6"
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defs method_def: "method \<equiv> \<lambda>(G,C). class_rec (G,C) empty (\<lambda>C fs ms ts.
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                           ts ++ map_of (map (\<lambda>(s,m). (s,(C,m))) ms))"
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lemma method_rec_lemma: "[|class G C = Some (D,fs,ms); wf ((subcls1 G)^-1)|] ==>
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  method (G,C) = (if C = Object then empty else method (G,D)) ++  
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  map_of (map (\<lambda>(s,m). (s,(C,m))) ms)"
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apply (unfold method_def)
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apply (simp split del: split_if)
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apply (erule (1) class_rec_lemma [THEN trans]);
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apply auto
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done
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-- "list of fields of a class, including inherited and hidden ones"
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defs fields_def: "fields \<equiv> \<lambda>(G,C). class_rec (G,C) []    (\<lambda>C fs ms ts.
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                           map (\<lambda>(fn,ft). ((fn,C),ft)) fs @ ts)"
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lemma fields_rec_lemma: "[|class G C = Some (D,fs,ms); wf ((subcls1 G)^-1)|] ==>
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 fields (G,C) = 
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  map (\<lambda>(fn,ft). ((fn,C),ft)) fs @ (if C = Object then [] else fields (G,D))"
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apply (unfold fields_def)
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apply (simp split del: split_if)
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apply (erule (1) class_rec_lemma [THEN trans]);
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apply auto
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done
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defs field_def: "field == map_of o (map (\<lambda>((fn,fd),ft). (fn,(fd,ft)))) o fields"
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lemma field_fields: 
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"field (G,C) fn = Some (fd, fT) \<Longrightarrow> map_of (fields (G,C)) (fn, fd) = Some fT"
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apply (unfold field_def)
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apply (rule table_of_remap_SomeD)
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apply simp
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done
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-- "widening, viz. method invocation conversion,cf. 5.3 i.e. sort of syntactic subtyping"
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inductive "widen G" intros 
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  refl   [intro!, simp]:       "G\<turnstile>      T \<preceq> T"   -- "identity conv., cf. 5.1.1"
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  subcls         : "G\<turnstile>C\<preceq>C D ==> G\<turnstile>Class C \<preceq> Class D"
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  null   [intro!]:             "G\<turnstile>     NT \<preceq> RefT R"
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-- "casting conversion, cf. 5.5 / 5.1.5"
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-- "left out casts on primitve types"
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inductive "cast G" intros
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  widen:  "G\<turnstile>C\<preceq>C D ==> G\<turnstile>C \<preceq>? D"
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  subcls: "G\<turnstile>D\<preceq>C C ==> G\<turnstile>C \<preceq>? D"
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lemma widen_PrimT_RefT [iff]: "(G\<turnstile>PrimT pT\<preceq>RefT rT) = False"
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apply (rule iffI)
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apply (erule widen.elims)
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apply auto
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done
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lemma widen_RefT: "G\<turnstile>RefT R\<preceq>T ==> \<exists>t. T=RefT t"
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apply (ind_cases "G\<turnstile>S\<preceq>T")
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apply auto
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done
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lemma widen_RefT2: "G\<turnstile>S\<preceq>RefT R ==> \<exists>t. S=RefT t"
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apply (ind_cases "G\<turnstile>S\<preceq>T")
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apply auto
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done
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lemma widen_Class: "G\<turnstile>Class C\<preceq>T ==> \<exists>D. T=Class D"
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apply (ind_cases "G\<turnstile>S\<preceq>T")
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apply auto
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done
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lemma widen_Class_NullT [iff]: "(G\<turnstile>Class C\<preceq>NT) = False"
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apply (rule iffI)
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apply (ind_cases "G\<turnstile>S\<preceq>T")
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apply auto
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done
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lemma widen_Class_Class [iff]: "(G\<turnstile>Class C\<preceq> Class D) = (G\<turnstile>C\<preceq>C D)"
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apply (rule iffI)
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apply (ind_cases "G\<turnstile>S\<preceq>T")
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apply (auto elim: widen.subcls)
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done
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theorem widen_trans[trans]: "\<lbrakk>G\<turnstile>S\<preceq>U; G\<turnstile>U\<preceq>T\<rbrakk> \<Longrightarrow> G\<turnstile>S\<preceq>T"
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proof -
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  assume "G\<turnstile>S\<preceq>U" thus "\<And>T. G\<turnstile>U\<preceq>T \<Longrightarrow> G\<turnstile>S\<preceq>T"
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  proof induct
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    case (refl T T') thus "G\<turnstile>T\<preceq>T'" .
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  next
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    case (subcls C D T)
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    then obtain E where "T = Class E" by (blast dest: widen_Class)
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    with subcls show "G\<turnstile>Class C\<preceq>T" by (auto elim: rtrancl_trans)
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  next
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    case (null R RT)
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    then obtain rt where "RT = RefT rt" by (blast dest: widen_RefT)
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    thus "G\<turnstile>NT\<preceq>RT" by auto
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  qed
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qed
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end