(* Title: HOL/MicroJava/JVM/JVMInstructions.thy
Author: Gerwin Klein, Technische Universitaet Muenchen
*)
section \<open>Instructions of the JVM\<close>
theory JVMInstructions imports JVMState begin
datatype
instr = Load nat -- "load from local variable"
| Store nat -- "store into local variable"
| LitPush val -- "push a literal (constant)"
| 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 top element and push 2 down"
| Dup_x2 -- "duplicate top element and push 3 down"
| Swap -- "swap top and next to top element"
| IAdd -- "integer addition"
| Goto int -- "goto relative address"
| Ifcmpeq int -- "branch if int/ref comparison succeeds"
| Throw -- "throw top of stack as exception"
type_synonym
bytecode = "instr list"
type_synonym
exception_entry = "p_count \<times> p_count \<times> p_count \<times> cname"
-- "start-pc, end-pc, handler-pc, exception type"
type_synonym
exception_table = "exception_entry list"
type_synonym
jvm_method = "nat \<times> nat \<times> bytecode \<times> exception_table"
-- "max stacksize, size of register set, instruction sequence, handler table"
type_synonym
jvm_prog = "jvm_method prog"
end