src/HOL/Bali/Term.thy
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(*  Title:      HOL/Bali/Term.thy
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    ID:         $Id$
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    Author:     David von Oheimb
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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*)
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header {* Java expressions and statements *}
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theory Term = Value + Table:
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text {*
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design issues:
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\begin{itemize}
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\item invocation frames for local variables could be reduced to special static
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  objects (one per method). This would reduce redundancy, but yield a rather
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  non-standard execution model more difficult to understand.
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\item method bodies separated from calls to handle assumptions in axiomat. 
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  semantics
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  NB: Body is intended to be in the environment of the called method.
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\item class initialization is regarded as (auxiliary) statement 
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      (required for AxSem)
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\item result expression of method return is handled by a special result variable
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  result variable is treated uniformly with local variables
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  \begin{itemize}
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  \item[+] welltypedness and existence of the result/return expression is 
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           ensured without extra efford
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  \end{itemize}
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\end{itemize}
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simplifications:
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\begin{itemize}
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\item expression statement allowed for any expression
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\item no unary, binary, etc, operators
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\item This  is modeled as a special non-assignable local variable
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\item Super is modeled as a general expression with the same value as This
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\item access to field x in current class via This.x
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\item NewA creates only one-dimensional arrays;
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  initialization of further subarrays may be simulated with nested NewAs
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\item The 'Lit' constructor is allowed to contain a reference value.
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  But this is assumed to be prohibited in the input language, which is enforced
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  by the type-checking rules.
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\item a call of a static method via a type name may be simulated by a dummy 
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      variable
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\item no nested blocks with inner local variables
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\item no synchronized statements
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\item no secondary forms of if, while (e.g. no for) (may be easily simulated)
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\item no switch (may be simulated with if)
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\item the @{text try_catch_finally} statement is divided into the 
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      @{text try_catch} statement 
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      and a finally statement, which may be considered as try..finally with 
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      empty catch
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\item the @{text try_catch} statement has exactly one catch clause; 
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      multiple ones can be
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  simulated with instanceof
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\item the compiler is supposed to add the annotations {@{text _}} during 
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      type-checking. This
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  transformation is left out as its result is checked by the type rules anyway
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\end{itemize}
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*}
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types locals = "(lname, val) table"  (* local variables *)
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datatype jump
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        = Break label (* break *)
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        | Cont label  (* continue *)
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        | Ret         (* return from method *)
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datatype xcpt        (* exception *)
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	= Loc loc    (* location of allocated execption object *)
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	| Std xname  (* intermediate standard exception, see Eval.thy *)
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datatype error
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       = AccessViolation (* Access to a member that isn't permitted *)
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datatype abrupt      (* abrupt completion *) 
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        = Xcpt xcpt  (* exception *)
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        | Jump jump  (* break, continue, return *)
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        | Error error (* runtime errors, we wan't to detect and proof absent
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                         in welltyped programms *)
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types
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  abopt  = "abrupt option"
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text {* Local variable store and exception. 
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Anticipation of State.thy used by smallstep semantics. For a method call, 
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we save the local variables of the caller in the term Callee to restore them 
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after method return. Also an exception must be restored after the finally
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statement *}
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translations
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 "locals" <= (type) "(lname, val) table"
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datatype inv_mode                  (* invocation mode for method calls *)
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	= Static                   (* static *)
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	| SuperM                   (* super  *)
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	| IntVir                   (* interface or virtual *)
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record  sig =            (* signature of a method, cf. 8.4.2  *)
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	  name ::"mname"      (* acutally belongs to Decl.thy *)
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          parTs::"ty list"        
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  "sig" <= (type) "\<lparr>name::mname,parTs::ty list\<rparr>"
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  "sig" <= (type) "\<lparr>name::mname,parTs::ty list,\<dots>::'a\<rparr>"
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-- "function codes for unary operations"
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datatype unop =  UPlus    -- "+ unary plus" 
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               | UMinus   -- "- unary minus"
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               | UBitNot  -- "~ bitwise NOT"
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               | UNot     -- "! logical complement"
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-- "function codes for binary operations"
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datatype binop = Mul     -- "*   multiplication"
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               | Div     -- "/   division"
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               | Mod     -- "%   remainder"
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               | Plus    -- "+   addition"
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               | Minus   -- "-   subtraction"
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               | LShift  -- "<<  left shift"
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               | RShift  -- ">>  signed right shift"
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               | RShiftU -- ">>> unsigned right shift"
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               | Less    -- "<   less than"
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               | Le      -- "<=  less than or equal"
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               | Greater -- ">   greater than"
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               | Ge      -- ">=  greater than or equal"
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               | Eq      -- "==  equal"
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               | Neq     -- "!=  not equal"
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               | BitAnd  -- "&   bitwise AND"
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               | And     -- "&   boolean AND"
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               | BitXor  -- "^   bitwise Xor"
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               | Xor     -- "^   boolean Xor"
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               | BitOr   -- "|   bitwise Or"
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               | Or      -- "|   boolean Or"
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datatype var
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	= LVar                  lname(* local variable (incl. parameters) *)
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        | FVar qtname qtname bool expr vname
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                                (*class field*)("{_,_,_}_.._"[10,10,10,85,99]90)
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	| AVar expr expr    (* array component *) ("_.[_]"[90,10   ]90)
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        | InsInitV stmt var (* insertion of initialization before
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                                   evaluation of var (for smallstep sem.) *)
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and expr
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	= NewC qtname         (* class instance creation *)
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	| NewA ty expr        (* array creation *) ("New _[_]"[99,10   ]85)
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	| Cast ty expr        (* type cast  *)
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	| Inst expr ref_ty    (* instanceof *)     ("_ InstOf _"[85,99] 85)
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	| Lit  val            (* literal value, references not allowed *)
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        | UnOp unop expr        (* unary operation *)
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        | BinOp binop expr expr (* binary operation *)
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	| Super               (* special Super keyword *)
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	| Acc  var            (* variable access *)
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	| Ass  var expr       (* variable assign *) ("_:=_"   [90,85   ]85)
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	| Cond expr expr expr (* conditional *)  ("_ ? _ : _" [85,85,80]80)
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        | Call qtname ref_ty inv_mode expr mname "(ty list)" 
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               "(expr list)"  (* method call *) 
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                              ("{_,_,_}_\<cdot>_'( {_}_')"[10,10,10,85,99,10,10]85)
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        | Methd qtname sig    (*   (folded) method (see below) *)
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        | Body qtname stmt    (* (unfolded) method body *)
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        | InsInitE stmt expr      (* insertion of initialization before
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                                   evaluation of expr (for smallstep sem.) *)
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        | Callee locals expr      (* save Callers locals in Callee-Frame
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                                     (for smallstep semantics) *)
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and  stmt
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	= Skip                  (* empty      statement *)
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	| Expr  expr            (* expression statement *)
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        | Lab   jump stmt       ("_\<bullet> _"(* labeled statement*)[      99,66]66)
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                                (* handles break *)
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	| Comp  stmt stmt       ("_;; _"                  [      66,65]65)
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	| If_   expr stmt stmt  ("If'(_') _ Else _"          [   80,79,79]70)
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	| Loop  label expr stmt ("_\<bullet> While'(_') _"           [   99,80,79]70)
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        | Do jump               (* break, continue, return *)
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	| Throw expr
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        | TryC  stmt
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	     qtname vname stmt ("Try _ Catch'(_ _') _"     [79,99,80,79]70)
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	| Fin  stmt  stmt        ("_ Finally _"               [      79,79]70)
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        | FinA abopt stmt        (* Save abruption of first statement 
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                                    (for smallstep sem.) *)
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	| Init  qtname              (* class initialization *)
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text {*
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The expressions Methd and Body are artificial program constructs, in the
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sense that they are not used to define a concrete Bali program. In the 
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operational semantic's they are "generated on the fly" 
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to decompose the task to define the behaviour of the Call expression. 
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They are crucial for the axiomatic semantics to give a syntactic hook to insert 
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some assertions (cf. AxSem.thy, Eval.thy). 
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The Init statement (to initialize a class on its first use) is 
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inserted in various places by the semantics. 
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Callee, InsInitV, InsInitE,FinA are only needed as intermediate steps in the
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smallstep (transition) semantics (cf. Trans.thy). Callee is used to save the 
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local variables of the caller for method return. So ve avoid modelling a 
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frame stack.
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The InsInitV/E terms are only used by the smallstep semantics to model the
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intermediate steps of class-initialisation.
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*}
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types "term" = "(expr+stmt,var,expr list) sum3"
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translations
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  "sig"   <= (type) "mname \<times> ty list"
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  "var"   <= (type) "Term.var"
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  "expr"  <= (type) "Term.expr"
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  "stmt"  <= (type) "Term.stmt"
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  "term"  <= (type) "(expr+stmt,var,expr list) sum3"
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syntax
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  this    :: expr
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  LAcc    :: "vname \<Rightarrow> expr" ("!!")
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  LAss    :: "vname \<Rightarrow> expr \<Rightarrow>stmt" ("_:==_" [90,85] 85)
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  Return  :: "expr \<Rightarrow> stmt"
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  StatRef :: "ref_ty \<Rightarrow> expr"
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translations
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 "this"       == "Acc (LVar This)"
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 "!!v"        == "Acc (LVar (EName (VNam v)))"
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 "v:==e"      == "Expr (Ass (LVar (EName (VNam  v))) e)"
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 "Return e"   == "Expr (Ass (LVar (EName Res)) e);; Do Ret" 
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                                                   (* Res := e;; Do Ret *)
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 "StatRef rt" == "Cast (RefT rt) (Lit Null)"
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constdefs
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  is_stmt :: "term \<Rightarrow> bool"
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 "is_stmt t \<equiv> \<exists>c. t=In1r c"
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ML {*
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bind_thms ("is_stmt_rews", sum3_instantiate (thm "is_stmt_def"));
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*}
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declare is_stmt_rews [simp]
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end