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(* Title: HOL/MicroJava/JVM/LoadAndStore.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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Load and store instructions
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*)
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LoadAndStore = JVMState +
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(** load and store instructions transfer values between local variables
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and operand stack. Values must all be of the same size (or tagged) **)
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datatype load_and_store =
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Load nat (* load from local variable *)
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| Store nat (* store into local variable *)
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| Bipush int (* push int *)
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| Aconst_null (* push null *)
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consts
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exec_las :: "[load_and_store,opstack,locvars,p_count] \\<Rightarrow> (opstack \\<times> locvars \\<times> p_count)"
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primrec
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"exec_las (Load idx) stk vars pc = ((vars ! idx) # stk , vars , pc+1)"
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"exec_las (Store idx) stk vars pc = (tl stk , vars[idx:=hd stk] , pc+1)"
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"exec_las (Bipush ival) stk vars pc = (Intg ival # stk , vars , pc+1)"
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"exec_las Aconst_null stk vars pc = (Null # stk , vars , pc+1)"
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end
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