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(* Title: HOL/MicroJava/BV/Altern.thy
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ID: $Id$
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Author: Martin Strecker
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*)
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(* Alternative definition of well-typing of bytecode,
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used in compiler type correctness proof *)
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13672
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theory Altern = BVSpec:
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constdefs
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check_type :: "jvm_prog \<Rightarrow> nat \<Rightarrow> nat \<Rightarrow> state \<Rightarrow> bool"
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"check_type G mxs mxr s \<equiv> s \<in> states G mxs mxr"
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wt_instr_altern :: "[instr,jvm_prog,ty,method_type,nat,nat,p_count,
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exception_table,p_count] \<Rightarrow> bool"
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"wt_instr_altern i G rT phi mxs mxr max_pc et pc \<equiv>
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app i G mxs rT pc et (phi!pc) \<and>
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check_type G mxs mxr (OK (phi!pc)) \<and>
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(\<forall>(pc',s') \<in> set (eff i G pc et (phi!pc)). pc' < max_pc \<and> G \<turnstile> s' <=' phi!pc')"
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wt_method_altern :: "[jvm_prog,cname,ty list,ty,nat,nat,instr list,
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exception_table,method_type] \<Rightarrow> bool"
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"wt_method_altern G C pTs rT mxs mxl ins et phi \<equiv>
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let max_pc = length ins in
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0 < max_pc \<and>
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length phi = length ins \<and>
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check_bounded ins et \<and>
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wt_start G C pTs mxl phi \<and>
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(\<forall>pc. pc<max_pc \<longrightarrow> wt_instr_altern (ins!pc) G rT phi mxs (1+length pTs+mxl) max_pc et pc)"
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lemma wt_method_wt_method_altern :
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"wt_method G C pTs rT mxs mxl ins et phi \<longrightarrow> wt_method_altern G C pTs rT mxs mxl ins et phi"
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apply (simp add: wt_method_def wt_method_altern_def)
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apply (intro strip)
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apply clarify
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apply (drule spec, drule mp, assumption)
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apply (simp add: check_types_def wt_instr_def wt_instr_altern_def check_type_def)
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apply (auto intro: imageI)
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done
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lemma check_type_check_types [rule_format]:
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"(\<forall>pc. pc < length phi \<longrightarrow> check_type G mxs mxr (OK (phi ! pc)))
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\<longrightarrow> check_types G mxs mxr (map OK phi)"
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apply (induct phi)
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apply (simp add: check_types_def)
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apply (simp add: check_types_def)
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apply clarify
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apply (frule_tac x=0 in spec)
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apply (simp add: check_type_def)
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apply auto
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done
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lemma wt_method_altern_wt_method [rule_format]:
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"wt_method_altern G C pTs rT mxs mxl ins et phi \<longrightarrow> wt_method G C pTs rT mxs mxl ins et phi"
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apply (simp add: wt_method_def wt_method_altern_def)
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apply (intro strip)
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apply clarify
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apply (rule conjI)
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(* show check_types *)
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apply (rule check_type_check_types)
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apply (simp add: wt_instr_altern_def)
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(* show wt_instr *)
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apply (intro strip)
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apply (drule spec, drule mp, assumption)
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apply (simp add: wt_instr_def wt_instr_altern_def)
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done
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end
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