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(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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open Alpha_context

type execution_trace =
  (Script.location * Gas.t * (Script.expr * string option) list) list

type error += Reject of Script.location * Script.expr * execution_trace option
type error += Overflow of Script.location * execution_trace option
type error += Runtime_contract_error : Contract.t * Script.expr -> error
type error += Bad_contract_parameter of Contract.t (* `Permanent *)
type error += Cannot_serialize_log
type error += Cannot_serialize_failure
type error += Cannot_serialize_storage

type execution_result =
  { ctxt : context ;
    storage : Script.expr ;
    big_map_diff : Contract.big_map_diff option ;
    operations : packed_internal_operation list }

type step_constants =
  { source : Contract.t ;
    payer : Contract.t ;
    self : Contract.t ;
    amount : Tez.t ;
    chain_id : Chain_id.t }

type 'tys stack =
  | Item : 'ty * 'rest stack -> ('ty * 'rest) stack
  | Empty : Script_typed_ir.end_of_stack stack

val step:
  ?log: execution_trace ref ->
  context -> step_constants ->
  ('bef, 'aft) Script_typed_ir.descr ->
  'bef stack ->
  ('aft stack * context) tzresult Lwt.t

val execute:
  Alpha_context.t ->
  Script_ir_translator.unparsing_mode ->
  step_constants ->
  script: Script.t ->
  entrypoint: string ->
  parameter: Script.expr ->
  execution_result tzresult Lwt.t

val trace:
  Alpha_context.t ->
  Script_ir_translator.unparsing_mode ->
  step_constants ->
  script: Script.t ->
  entrypoint: string ->
  parameter: Script.expr ->
  (execution_result * execution_trace) tzresult Lwt.t