
diff -r b505be6f029a -r 686fa0a0696e src/HOL/IMP/Procs_Dyn_Vars_Dyn.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/HOL/IMP/Procs_Dyn_Vars_Dyn.thy	Mon Jun 06 16:29:38 2011 +0200
@@ -0,0 +1,40 @@
+theory Procs_Dyn_Vars_Dyn imports Util Procs
+begin
+
+subsubsection "Dynamic Scoping of Procedures and Variables"
+
+type_synonym penv = "name \<Rightarrow> com"
+
+inductive
+  big_step :: "penv \<Rightarrow> com \<times> state \<Rightarrow> state \<Rightarrow> bool" ("_ \<turnstile> _ \<Rightarrow> _" [60,0,60] 55)
+where
+Skip:    "pe \<turnstile> (SKIP,s) \<Rightarrow> s" |
+Assign:  "pe \<turnstile> (x ::= a,s) \<Rightarrow> s(x := aval a s)" |
+Semi:    "\<lbrakk> pe \<turnstile> (c\<^isub>1,s\<^isub>1) \<Rightarrow> s\<^isub>2;  pe \<turnstile> (c\<^isub>2,s\<^isub>2) \<Rightarrow> s\<^isub>3 \<rbrakk> \<Longrightarrow>
+          pe \<turnstile> (c\<^isub>1;c\<^isub>2, s\<^isub>1) \<Rightarrow> s\<^isub>3" |
+
+IfTrue:  "\<lbrakk> bval b s;  pe \<turnstile> (c\<^isub>1,s) \<Rightarrow> t \<rbrakk> \<Longrightarrow>
+         pe \<turnstile> (IF b THEN c\<^isub>1 ELSE c\<^isub>2, s) \<Rightarrow> t" |
+IfFalse: "\<lbrakk> \<not>bval b s;  pe \<turnstile> (c\<^isub>2,s) \<Rightarrow> t \<rbrakk> \<Longrightarrow>
+         pe \<turnstile> (IF b THEN c\<^isub>1 ELSE c\<^isub>2, s) \<Rightarrow> t" |
+
+WhileFalse: "\<not>bval b s \<Longrightarrow> pe \<turnstile> (WHILE b DO c,s) \<Rightarrow> s" |
+WhileTrue:
+  "\<lbrakk> bval b s\<^isub>1;  pe \<turnstile> (c,s\<^isub>1) \<Rightarrow> s\<^isub>2;  pe \<turnstile> (WHILE b DO c, s\<^isub>2) \<Rightarrow> s\<^isub>3 \<rbrakk> \<Longrightarrow>
+   pe \<turnstile> (WHILE b DO c, s\<^isub>1) \<Rightarrow> s\<^isub>3" |
+
+Var: "pe \<turnstile> (c,s) \<Rightarrow> t  \<Longrightarrow>  pe \<turnstile> ({VAR x;; c}, s) \<Rightarrow> t(x := s x)" |
+
+Call: "pe \<turnstile> (pe p, s) \<Rightarrow> t  \<Longrightarrow>  pe \<turnstile> (CALL p, s) \<Rightarrow> t" |
+
+Proc: "pe(p := cp) \<turnstile> (c,s) \<Rightarrow> t  \<Longrightarrow>  pe \<turnstile> ({PROC p = cp;; c}, s) \<Rightarrow> t"
+
+code_pred big_step .
+
+(* FIXME: example state syntax *)
+values "{map t [''x'',''y'',''z''] |t. 
+          (\<lambda>p. SKIP) \<turnstile> (CALL ''p'', (%_. 0)(''x'' := 42, ''y'' := 43)) \<Rightarrow> t}"
+
+values "{map t [''x'',''y'',''z''] |t. (\<lambda>p. SKIP) \<turnstile> (test_com, (%_. 0)) \<Rightarrow> t}"
+
+end




