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(* Title: HOL/MicroJava/JVM/Opstack.thy
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ID: $Id$
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Author: Cornelia Pusch
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Copyright 1999 Technische Universitaet Muenchen
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Manipulation of operand stack
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*)
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Opstack = JVMState +
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(** instructions for the direct manipulation of the operand stack **)
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datatype
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op_stack =
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Pop
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| Dup
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| Dup_x1
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| Dup_x2
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| Swap
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| ADD
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consts
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exec_os :: "[op_stack,opstack,p_count] \\<Rightarrow> (opstack \\<times> p_count)"
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primrec
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"exec_os Pop stk pc = (tl stk , pc+1)"
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"exec_os Dup stk pc = (hd stk # stk , pc+1)"
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"exec_os Dup_x1 stk pc = (hd stk # hd (tl stk) # hd stk # (tl (tl stk)) , pc+1)"
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"exec_os Dup_x2 stk pc = (hd stk # hd (tl stk) # (hd (tl (tl stk))) # hd stk # (tl (tl (tl stk))) , pc+1)"
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"exec_os Swap stk pc =
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(let (val1,val2) = (hd stk,hd (tl stk))
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in
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(val2#val1#(tl (tl stk)) , pc+1))"
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"exec_os ADD stk pc =
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(let (val1,val2) = (hd stk,hd (tl stk))
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in
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(Intg ((the_Intg val1)+(the_Intg val2))#(tl (tl stk)), pc+1))"
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end
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