-(* Goalfile evaluation
+(* Goalfile Abstract Syntax Tree
* Copyright (C) 2019 Richard W.M. Jones
* Copyright (C) 2019 Red Hat Inc.
*
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
-open Printf
-
open Utils
-let rec evaluate_targets env exprs =
- List.iter (evaluate_target env) exprs
-
-and evaluate_target env = function
- | Ast.EGoalDefn _ | Ast.ETacticDefn _ -> assert false
-
- (* Call a goal. *)
- | Ast.ECallGoal (loc, name, args) ->
- let goal = Ast.getgoal env loc name in
- run_goal env loc name args goal
-
- (* Call a tactic. *)
- | Ast.ETacticConstructor (loc, name, args) ->
- (* All parameters of tactics must be simple constant expressions
- * (strings, in future booleans, numbers, etc).
- *)
- let args = List.map (Ast.to_constant env) args in
- run_tactic env loc name args
+let rec to_constant env = function
+ | Ast.EConstant (loc, c) -> c
- (* If this is a goal then it's the same as calling goal(). If not
- * then look up the variable and substitute it.
- *)
- | Ast.EVar (loc, name) ->
+ | EVar (loc, name) ->
let expr = Ast.getvar env loc name in
- (match expr with
- | EGoalDefn (loc, ([], _, _, _)) ->
- evaluate_target env (Ast.ECallGoal (loc, name, []))
- | EGoalDefn _ ->
- failwithf "%a: cannot call %s() since this goal has parameters"
- Ast.string_loc loc name
- | _ ->
- evaluate_target env expr
- )
-
- (* Lists are inlined when found as a target. *)
- | Ast.EList (loc, exprs) ->
- evaluate_targets env exprs
-
- (* A string (with or without substitutions) implies *file(filename). *)
- | Ast.ESubsts (loc, str) ->
- let str = Ast.substitute env loc str in
- run_tactic env loc "*file" [Ast.CString str]
-
- | Ast.EConstant (loc, c) ->
- run_tactic env loc "*file" [c]
+ to_constant env expr
-(* Run a goal by name. *)
-and run_goal env loc name args (params, patterns, deps, code) =
- Cmdline.debug "%a: running goal %s %a"
- Ast.string_loc loc name Ast.string_expr (Ast.EList (Ast.noloc, args));
+ | ESubsts (loc, str) ->
+ CString (substitute env loc str)
- (* This is the point where we evaluate the goal arguments. We must
- * do this before creating the new environment, because variables
- * appearing in goal arguments don't refer to goal parameters.
- *)
- let args = List.map (evaluate_goal_arg env) args in
+ | EList (loc, _) ->
+ failwithf "%a: list found where constant expression expected"
+ Ast.string_loc loc
- (* Create a new environment which maps the parameter names to
- * the args.
- *)
- let env =
- let params =
- try List.combine params args
- with Invalid_argument _ ->
- failwithf "%a: calling goal ‘%s’ with wrong number of arguments"
- Ast.string_loc loc name in
- List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
-
- (* Check all dependencies have been updated. *)
- evaluate_targets env deps;
-
- (* Check if any target (ie. pattern) needs to be rebuilt.
- * As with make, a goal with no targets is always run.
- *)
- let rebuild =
- patterns = [] || List.exists (needs_rebuild env loc deps) patterns in
+ | ECallGoal (loc, name, _) ->
+ failwithf "%a: cannot use goal ‘%s’ in constant expression"
+ Ast.string_loc loc name
- if rebuild then (
- (* Run the code (if any). *)
- (match code with
- | None -> () (* No { CODE } section. *)
+ | ETacticConstructor (loc, name, _) ->
+ failwithf "%a: cannot use tactic ‘%s’ in constant expression"
+ Ast.string_loc loc name
- | Some code ->
- (* Add some standard variables to the environment. *)
- let expr_of_substs s = Ast.ESubsts (Ast.noloc, s) in
- let expr_of_pattern = function
- | Ast.PTactic (loc, tactic, targs) ->
- Ast.ETacticConstructor (loc, tactic, List.map expr_of_substs targs)
- in
- let pexprs = List.map expr_of_pattern patterns in
- let env = Ast.Env.add "@" (Ast.EList (Ast.noloc, pexprs)) env in
- let env = Ast.Env.add "<" (Ast.EList (Ast.noloc, deps)) env in
- let env =
- match deps with
- | [] -> env
- | d :: _ -> Ast.Env.add "^" d env in
- let code = Ast.to_shell_script env loc code in
- let code = "set -e\nset -x\n\n" ^ code in
- let r = Sys.command code in
- if r <> 0 then (
- eprintf "*** goal ‘%s’ failed with exit code %d\n" name r;
- exit 1
- );
+ | EGoalDefn (loc, _) ->
+ failwithf "%a: cannot use goal in constant expression"
+ Ast.string_loc loc
+
+ | ETacticDefn (loc, _) ->
+ failwithf "%a: cannot use tactic in constant expression"
+ Ast.string_loc loc
+
+and substitute env loc substs =
+ let b = Buffer.create 13 in
+ List.iter (
+ function
+ | Ast.SString s -> Buffer.add_string b s
+ | SVar name ->
+ let expr = Ast.getvar env loc name in
+ match to_constant env expr with
+ | Ast.CString s -> Buffer.add_string b s
+ ) substs;
+ Buffer.contents b
+
+let rec to_shell_script env loc substs =
+ let b = Buffer.create 13 in
+ List.iter (
+ function
+ | Ast.SString s -> Buffer.add_string b s
+ | SVar name ->
+ let expr = Ast.getvar env loc name in
+ let s = expr_to_shell_string env expr in
+ Buffer.add_string b s
+ ) substs;
+ Buffer.contents b
+
+and expr_to_shell_string env = function
+ | Ast.EConstant (loc, CString s) -> Filename.quote s
+
+ | EVar (loc, name) ->
+ let expr = Ast.getvar env loc name in
+ expr_to_shell_string env expr
- (* Check all targets were updated after the code was
- * run (else it's an error).
- *)
- let pattern_still_needs_rebuild =
- try Some (List.find (needs_rebuild env loc deps) patterns)
- with Not_found -> None in
- match pattern_still_needs_rebuild with
- | None -> ()
- | Some pattern ->
- failwithf "%a: goal ‘%s’ ran successfully but it did not rebuild %a"
- Ast.string_loc loc
- name
- Ast.string_pattern pattern
- )
- )
+ | ESubsts (loc, str) ->
+ Filename.quote (substitute env loc str)
-(* Return whether the target (pattern) needs to be rebuilt. *)
-and needs_rebuild env loc deps pattern =
- Cmdline.debug "%a: testing if %a needs rebuild"
- Ast.string_loc loc Ast.string_pattern pattern;
+ | EList (loc, exprs) ->
+ let strs = List.map (expr_to_shell_string env) exprs in
+ (* These are shell quoted so we can just concat them with space. *)
+ String.concat " " strs
- match pattern with
- | Ast.PTactic (loc, tactic, targs) ->
- (* Look up the tactic. *)
- let params, code = Ast.gettactic env loc tactic in
+ | ECallGoal (loc, name, _) ->
+ failwithf "%a: cannot use goal ‘%s’ in shell expansion"
+ Ast.string_loc loc name
- (* Resolve the targs down to constants. Since needs_rebuild
- * should be called with env containing the goal params, this
- * should substitute any parameters in the tactic arguments.
- *)
- let targs = List.map (Ast.substitute env loc) targs in
- let targs =
- List.map (fun targ ->
- Ast.EConstant (Ast.noloc, Ast.CString targ)) targs in
+ (* Tactics expand to the first parameter. *)
+ | ETacticConstructor (loc, _, []) -> Filename.quote ""
+ | ETacticConstructor (loc, _, (arg :: _)) -> expr_to_shell_string env arg
- (* Create a new environment binding parameter names
- * to tactic args.
- *)
- let env =
- let params =
- try List.combine params targs
- with Invalid_argument _ ->
- failwithf "%a: calling tactic ‘%s’ with wrong number of arguments"
- Ast.string_loc loc tactic in
- List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
+ | EGoalDefn (loc, _) ->
+ failwithf "%a: cannot use goal in shell expansion"
+ Ast.string_loc loc
- (* Add some standard variables to the environment. *)
- let env = Ast.Env.add "<" (Ast.EList (Ast.noloc, deps)) env in
- let env =
- match deps with
- | [] -> env
- | d :: _ -> Ast.Env.add "^" d env in
- let code = Ast.to_shell_script env loc code in
- let code = "set -e\nset -x\n\n" ^ code in
- let r = Sys.command code in
- if r = 99 (* means "needs rebuild" *) then true
- else if r = 0 (* means "doesn't need rebuild" *) then false
- else (
- eprintf "*** tactic ‘%s’ failed with exit code %d\n" tactic r;
- exit 1
- )
+ | ETacticDefn (loc, _) ->
+ failwithf "%a: cannot use tactic in shell expansion"
+ Ast.string_loc loc
-(* Evaluate a goal argument. This substitutes any variables found,
- * and recursively calls functions.
- *)
-and evaluate_goal_arg env = function
+let rec evaluate_goal_arg env = function
| Ast.EVar (loc, name) ->
let expr = Ast.getvar env loc name in
evaluate_goal_arg env expr
- | Ast.ESubsts (loc, str) ->
+ | ESubsts (loc, str) ->
let str = Ast.substitute env loc str in
Ast.EConstant (loc, Ast.CString str)
- | Ast.EList (loc, exprs) ->
+ | EList (loc, exprs) ->
Ast.EList (loc, List.map (evaluate_goal_arg env) exprs)
- | Ast.ETacticConstructor (loc, name, exprs) ->
+ | ETacticConstructor (loc, name, exprs) ->
Ast.ETacticConstructor (loc, name, List.map (evaluate_goal_arg env) exprs)
- | Ast.ECallGoal (loc, name, _) ->
+ | ECallGoal (loc, name, _) ->
(* Goals don't return anything so they cannot be used in
* goal args. Use a function instead.
*)
failwithf "%a: cannot use goal ‘%s’ in goal argument"
Ast.string_loc loc name
- | Ast.EConstant _
- | Ast.EGoalDefn _
- | Ast.ETacticDefn _ as e -> e
-
-(* Find the goal which matches the given tactic and run it.
- * cargs is a list of parameters (all constants).
- *)
-and run_tactic env loc tactic cargs =
- Cmdline.debug "%a: running tactic %s" Ast.string_loc loc tactic;
-
- (* Find all goals in the environment. Returns a list of (name, goal). *)
- let goals =
- let env = Ast.Env.bindings env in
- filter_map
- (function
- | name, Ast.EGoalDefn (loc, goal) -> Some (name, goal)
- | _ -> None) env in
-
- (* Find all patterns. Returns a list of (pattern, name, goal). *)
- let patterns : (Ast.pattern * Ast.id * Ast.goal) list =
- List.flatten
- (List.map (fun (name, ((_, patterns, _, _) as goal)) ->
- List.map (fun pattern -> (pattern, name, goal)) patterns) goals) in
-
- (* Find any patterns (ie. tactics) which match the one we
- * are searching for. This returns a binding for the goal args,
- * so we end up with a list of (pattern, name, goal, args).
- *)
- let patterns : (Ast.pattern * Ast.id * Ast.goal * Ast.expr list) list =
- filter_map (
- fun (pattern, name, ((params, _, _, _) as goal)) ->
- match matching_pattern env loc tactic cargs pattern params with
- | None -> None
- | Some args -> Some (pattern, name, goal, args)
- ) patterns in
-
- match patterns with
- | [] ->
- (* There's no matching goal, but we don't need one if
- * the tactic doesn't need to be rebuilt.
- *)
- let targs = List.map (function Ast.CString s -> [Ast.SString s]) cargs in
- let p = Ast.PTactic (loc, tactic, targs) in
- if needs_rebuild env loc [] p then (
- let t = Ast.ETacticConstructor (loc, tactic,
- List.map (fun c -> Ast.EConstant (loc, c))
- cargs) in
- failwithf "%a: don't know how to build %a"
- Ast.string_loc loc Ast.string_expr t
- )
-
- | goals ->
- (* One or more goals match. We run them all (although if
- * one of them succeeds in rebuilding, it will cut short the rest).
- *)
- List.iter (
- fun (_, name, goal, args) ->
- run_goal env loc name args goal
- ) goals
-
-(* Test if pattern matches *tactic(cargs). If it does
- * then we return Some args where args is the arguments that must
- * be passed to the matching goal. The params parameter is
- * the names of the parameters of that goal.
- *)
-and matching_pattern env loc tactic cargs pattern params =
- match pattern with
- | Ast.PTactic (loc, ttactic, targs)
- when tactic <> ttactic ||
- List.length cargs <> List.length targs ->
- None (* Can't possibly match if tactic name or #args is different. *)
- | Ast.PTactic (loc, ttactic, targs) ->
- (* Do the args match with a possible params binding? *)
- try Some (matching_params env loc params targs cargs)
- with Not_found -> None
-
-(* Return a possible binding. For example the goal is:
- * goal compile (name) = "%name.o": "%name.c" {}
- * which means that params = ["name"] and targs = ["%name.o"].
- *
- * If we are called with cargs = ["file1.o"], we would
- * return ["file1"].
- *
- * On non-matching this raises Not_found.
- *)
-and matching_params env loc params targs cargs =
- (* This is going to record the resulting binding. *)
- let res = ref Ast.Env.empty in
- List.iter2 (matching_param env loc params res) targs cargs;
-
- (* Rearrange the result into goal parameter order. Also this
- * checks that every parameter got a binding.
- *)
- let res = !res in
- List.map (
- (* Allow the Not_found exception to escape if no binding for this param. *)
- fun param -> Ast.Env.find param res
- ) params
-
-(* If targ = "%name.o" and carg = "file.o" then this would set
- * name => "file" in !res. If they don't match, raises Not_found.
- *)
-and matching_param env loc params res targ carg =
- match carg with
- | Ast.CString carg ->
- (* Substitute any non parameters in targ from the environment. *)
- let targ =
- List.map (
- function
- | Ast.SString _ as s -> s
- | Ast.SVar name ->
- if not (List.mem name params) then (
- try
- let expr = Ast.getvar env loc name in
- match Ast.to_constant env expr with
- | Ast.CString s -> Ast.SString s
- with Failure _ -> raise Not_found
- )
- else
- Ast.SVar name
- ) targ in
-
- (* Do the actual pattern matching. Any remaining SVar elements
- * must refer to goal parameters.
- *)
- let carg = ref carg in
- let rec loop = function
- | [] ->
- (* End of targ, we must have matched all of carg. *)
- if !carg <> "" then raise Not_found
- | Ast.SString s :: rest ->
- (* Does this match the first part of !carg? *)
- let clen = String.length !carg in
- let slen = String.length s in
- if slen > clen || s <> String.sub !carg 0 slen then
- raise Not_found;
- (* Yes, so continue after the matching prefix. *)
- carg := String.sub !carg slen (clen-slen);
- loop rest
- | Ast.SVar name :: Ast.SString s :: rest ->
- (* This is a goal parameter. Find s later in !carg. *)
- let i = string_find !carg s in
- if i = -1 then raise Not_found;
- (* Set the binding in !res. *)
- let r = Ast.EConstant (Ast.noloc,
- Ast.CString (String.sub !carg 0 i)) in
- res := Ast.Env.add name r !res;
- (* Continue after the match. *)
- let skip = i + String.length s in
- carg := String.sub !carg skip (String.length !carg - skip);
- loop rest
- | Ast.SVar name :: [] ->
- (* Matches the whole remainder of the string. *)
- let r = Ast.EConstant (Ast.noloc, Ast.CString !carg) in
- res := Ast.Env.add name r !res
- | Ast.SVar x :: Ast.SVar y :: _ ->
- (* TODO! We cannot match a target like "%x%y". *)
- assert false
- in
- loop targ
+ | EConstant _
+ | EGoalDefn _
+ | ETacticDefn _ as e -> e
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