(* Title: HOL/MicroJava/JVM/JVMInstructions.thy
ID: $Id$
Author: Gerwin Klein
Copyright 2000 Technische Universitaet Muenchen
*)
header {* Instructions of the JVM *}
theory JVMInstructions = JVMState:
datatype
instr = Load nat (* load from local variable *)
| Store nat (* store into local variable *)
| Bipush int (* push int *)
| Aconst_null (* push null *)
| New cname (* create object *)
| Getfield vname cname (* Fetch field from object *)
| Putfield vname cname (* Set field in object *)
| Checkcast cname (* Check whether object is of given type *)
| Invoke cname mname "(ty list)" (* inv. instance meth of an object *)
| Return (* return from method *)
| Pop (* pop top element from opstack *)
| Dup (* duplicate top element of opstack *)
| Dup_x1 (* duplicate next to top element *)
| Dup_x2 (* duplicate 3rd element *)
| Swap (* swap top and next to top element *)
| IAdd (* integer addition *)
| Goto int (* goto relative address *)
| Ifcmpeq int (* Branch if int/ref comparison succeeds *)
types
bytecode = "instr list"
jvm_prog = "(nat \<times> bytecode) prog"
end