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emit_expression.ml
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emit_expression.ml
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(**
* Copyright (c) 2017, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the "hack" directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*)
open Hh_core
open Hhbc_ast
open Instruction_sequence
open Ast_class_expr
open Ast_scope
module A = Ast
module H = Hhbc_ast
module TC = Hhas_type_constraint
module SN = Naming_special_names
module SU = Hhbc_string_utils
module ULS = Unique_list_string
(* Locals, array elements, and properties all support the same range of l-value
* operations. *)
module LValOp = struct
type t =
| Set
| SetRef
| SetOp of eq_op
| IncDec of incdec_op
| Unset
end
let is_local_this env id =
let scope = Emit_env.get_scope env in
id = SN.SpecialIdents.this
&& Ast_scope.Scope.has_this scope
&& not (Ast_scope.Scope.is_toplevel scope)
module InoutLocals = struct
(* for every local that appear as a part of inout argument and also mutated inside
argument list this record stores:
- position of the first argument when local appears as inout
- position of the last argument where local is mutated.
Within the this range at every usage of the local must be captured to make sure
that later when inout arguments will be written back the same value of the
local will be used *)
type alias_info = {
first_inout: int;
last_write: int;
}
let not_aliased =
{ first_inout = max_int; last_write = min_int }
let add_inout i r =
if i < r.first_inout then { r with first_inout = i } else r
let add_write i r =
if i > r.last_write then { r with last_write = i } else r
let in_range i r = i > r.first_inout || i <= r.last_write
let update name i f m =
let r =
SMap.get name m
|> Option.value ~default:not_aliased
|> f i in
SMap.add name r m
let add_write name i m = update name i add_write m
let add_inout name i m = update name i add_inout m
let collect_written_variables env args =
(* check value of the argument *)
let rec handle_arg ~is_top i acc arg =
match snd arg with
(* inout $v *)
| A.Callconv (A.Pinout, (_, A.Lvar (_, id)))
when not (is_local_this env id) ->
if is_top then add_inout id i acc else add_write id i acc
(* &$v *)
| A.Unop (A.Uref, (_, A.Lvar (_, id))) ->
add_write id i acc
(* $v *)
| A.Lvar _ ->
acc
| _ ->
(* dive into argument value *)
dive i acc arg
(* collect lvars on the left hand side of '=' operator *)
and collect_lvars_lhs i acc e =
match snd e with
| A.Lvar (_, id) when not (is_local_this env id) ->
add_write id i acc
| A.List exprs ->
List.fold_left exprs ~f:(collect_lvars_lhs i) ~init:acc
| _ -> acc
(* descend into expression *)
and dive i acc expr =
let visitor = object(_)
inherit [_] Ast_visitor.ast_visitor as super
(* lhs op= _ *)
method! on_binop acc bop l r =
let acc =
match bop with
| A.Eq _ -> collect_lvars_lhs i acc l
| _ -> acc in
super#on_binop acc bop l r
(* $i++ or $i-- *)
method! on_unop acc op e =
let acc =
match op with
| A.Uincr | A.Udecr -> collect_lvars_lhs i acc e
| _ -> acc in
super#on_unop acc op e
(* f(inout $v) or f(&$v) *)
method! on_call acc _ _ args uargs =
let f = handle_arg ~is_top:false i in
let acc = List.fold_left args ~init:acc ~f in
List.fold_left uargs ~init:acc ~f
end in
visitor#on_expr acc expr in
List.foldi args ~f:(handle_arg ~is_top:true) ~init:SMap.empty
(* determines if value of a local 'name' that appear in parameter 'i'
should be saved to local because it might be overwritten later *)
let should_save_local_value name i aliases =
Option.value_map ~default:false ~f:(in_range i) (SMap.get name aliases)
end
(* Describes what kind of value is intended to be stored in local *)
type stored_value_kind =
| Value_kind_local
| Value_kind_expression
(* represents sequence of instructions interleaved with temp locals.
<i, None :: rest> - is emitted i :: <rest> (commonly used for final instructions in sequence)
<i, Some (l, local_kind) :: rest> is emitted as
i
try-fault F {
setl/popl l; depending on local_kind
<rest>
}
unsetl l
F: unset l
unwind
*)
type instruction_sequence_with_locals =
(Instruction_sequence.t * (Local.t * stored_value_kind) option) list
(* converts instruction_sequence_with_locals to instruction_sequence.t *)
let rebuild_sequence s rest =
let rec aux = function
| [] -> rest ()
| (i, None) :: xs -> gather [ i; aux xs ]
| (i, Some (l, kind)) :: xs ->
let fault_label = Label.next_fault () in
let unset = instr_unsetl l in
let set = if kind = Value_kind_expression then instr_setl l else instr_popl l in
let try_block = gather [
set;
aux xs;
] in
let fault_block = gather [ unset; instr_unwind; ] in
gather [
i;
instr_try_fault fault_label try_block fault_block;
unset; ] in
aux s
(* result of emit_array_get *)
type array_get_instr =
(* normal $a[..] that does not need to spill anything*)
| Array_get_regular of Instruction_sequence.t
(* subscript expression used as inout argument that need to spill intermediate
values:
load - instruction_sequence_with_locals to load value
store - instruction to set value back (can use locals defined in load part)
*)
| Array_get_inout of {
load: instruction_sequence_with_locals;
store: Instruction_sequence.t
}
type 'a array_get_base_data = {
instrs_begin: 'a;
instrs_end: Instruction_sequence.t;
setup_instrs: Instruction_sequence.t;
stack_size: int
}
(* result of emit_base *)
type array_get_base =
(* normal <base> part in <base>[..] that does not need to spill anything *)
| Array_get_base_regular of Instruction_sequence.t array_get_base_data
(* base of subscript expression used as inout argument that need to spill
intermediate values *)
| Array_get_base_inout of {
(* instructions to load base part *)
load: instruction_sequence_with_locals array_get_base_data;
(* instruction to load base part for setting inout argument back *)
store: Instruction_sequence.t
}
let is_incdec op =
match op with
| LValOp.IncDec _ -> true
| _ -> false
let is_global_namespace env =
Namespace_env.is_global_namespace (Emit_env.get_namespace env)
let is_special_function env e args =
match snd e with
| A.Id (_, s) ->
begin
let n = List.length args in
match s with
| "isset" -> n > 0
| "empty" -> n = 1
| "tuple" when Emit_env.is_hh_syntax_enabled () -> true
| "define" when is_global_namespace env ->
begin match args with
| [_, A.String _; _] -> true
| _ -> false
end
| "eval" -> n = 1
| "idx" -> n = 2 || n = 3
| "class_alias" ->
begin
match args with
| [_, A.String _; _, A.String _]
| [_, A.String _; _, A.String _; _] -> true
| _ -> false
end
| _ -> false
end
| _ -> false
let optimize_null_check () =
Hhbc_options.optimize_null_check !Hhbc_options.compiler_options
let optimize_cuf () =
Hhbc_options.optimize_cuf !Hhbc_options.compiler_options
let hack_arr_compat_notices () =
Hhbc_options.hack_arr_compat_notices !Hhbc_options.compiler_options
let php7_ltr_assign () =
Hhbc_options.php7_ltr_assign !Hhbc_options.compiler_options
(* Emit a comment in lieu of instructions for not-yet-implemented features *)
let emit_nyi description =
instr (IComment (H.nyi ^ ": " ^ description))
let make_vec_like_array p es = p, A.Array (List.map es ~f:(fun e -> A.AFvalue e))
let make_kvarray p kvs =
p, A.Array (List.map kvs ~f:(fun (k, v) -> A.AFkvalue (k, v)))
(* Strict binary operations; assumes that operands are already on stack *)
let from_binop op =
let ints_overflow_to_ints =
Hhbc_options.ints_overflow_to_ints !Hhbc_options.compiler_options in
match op with
| A.Plus -> instr (IOp (if ints_overflow_to_ints then Add else AddO))
| A.Minus -> instr (IOp (if ints_overflow_to_ints then Sub else SubO))
| A.Star -> instr (IOp (if ints_overflow_to_ints then Mul else MulO))
| A.Slash -> instr (IOp Div)
| A.Eqeq -> instr (IOp Eq)
| A.EQeqeq -> instr (IOp Same)
| A.Starstar -> instr (IOp Pow)
| A.Diff -> instr (IOp Neq)
| A.Diff2 -> instr (IOp NSame)
| A.Lt -> instr (IOp Lt)
| A.Lte -> instr (IOp Lte)
| A.Gt -> instr (IOp Gt)
| A.Gte -> instr (IOp Gte)
| A.Dot -> instr (IOp Concat)
| A.Amp -> instr (IOp BitAnd)
| A.Bar -> instr (IOp BitOr)
| A.Ltlt -> instr (IOp Shl)
| A.Gtgt -> instr (IOp Shr)
| A.Cmp -> instr (IOp Cmp)
| A.Percent -> instr (IOp Mod)
| A.Xor -> instr (IOp BitXor)
| A.LogXor -> instr (IOp Xor)
| A.Eq _ -> emit_nyi "Eq"
| A.AMpamp
| A.BArbar ->
failwith "short-circuiting operator cannot be generated as a simple binop"
let binop_to_eqop op =
let ints_overflow_to_ints =
Hhbc_options.ints_overflow_to_ints !Hhbc_options.compiler_options in
match op with
| A.Plus -> Some (if ints_overflow_to_ints then PlusEqual else PlusEqualO)
| A.Minus -> Some (if ints_overflow_to_ints then MinusEqual else MinusEqualO)
| A.Star -> Some (if ints_overflow_to_ints then MulEqual else MulEqualO)
| A.Slash -> Some DivEqual
| A.Starstar -> Some PowEqual
| A.Amp -> Some AndEqual
| A.Bar -> Some OrEqual
| A.Xor -> Some XorEqual
| A.Ltlt -> Some SlEqual
| A.Gtgt -> Some SrEqual
| A.Percent -> Some ModEqual
| A.Dot -> Some ConcatEqual
| _ -> None
let unop_to_incdec_op op =
let ints_overflow_to_ints =
Hhbc_options.ints_overflow_to_ints !Hhbc_options.compiler_options in
match op with
| A.Uincr -> Some (if ints_overflow_to_ints then PreInc else PreIncO)
| A.Udecr -> Some (if ints_overflow_to_ints then PreDec else PreDecO)
| A.Upincr -> Some (if ints_overflow_to_ints then PostInc else PostIncO)
| A.Updecr -> Some (if ints_overflow_to_ints then PostDec else PostDecO)
| _ -> None
let collection_type = function
| "Vector" -> CollectionType.Vector
| "Map" -> CollectionType.Map
| "Set" -> CollectionType.Set
| "Pair" -> CollectionType.Pair
| "ImmVector" -> CollectionType.ImmVector
| "ImmMap" -> CollectionType.ImmMap
| "ImmSet" -> CollectionType.ImmSet
| x -> failwith ("unknown collection type '" ^ x ^ "'")
let istype_op lower_fq_id =
match lower_fq_id with
| "is_int" | "is_integer" | "is_long" -> Some OpInt
| "is_bool" -> Some OpBool
| "is_float" | "is_real" | "is_double" -> Some OpDbl
| "is_string" -> Some OpStr
| "is_array" -> Some OpArr
| "is_object" -> Some OpObj
| "is_null" -> Some OpNull
| "is_scalar" -> Some OpScalar
| "hh\\is_keyset" -> Some OpKeyset
| "hh\\is_dict" -> Some OpDict
| "hh\\is_vec" -> Some OpVec
| "hh\\is_varray" -> Some OpVArray
| "hh\\is_darray" -> Some OpDArray
| _ -> None
(* See EmitterVisitor::getPassByRefKind in emitter.cpp *)
let get_passByRefKind is_splatted expr =
let open PassByRefKind in
let rec from_non_list_assignment permissive_kind expr =
match snd expr with
| A.New _ | A.Lvar _ | A.Clone _
| A.Import ((A.Include | A.IncludeOnce), _) -> AllowCell
| A.Binop(A.Eq None, (_, A.List _), e) ->
from_non_list_assignment WarnOnCell e
| A.Array_get(_, Some _) -> permissive_kind
| A.Binop(A.Eq _, _, _) -> WarnOnCell
| A.Unop((A.Uincr | A.Udecr | A.Usilence), _) -> WarnOnCell
| A.Call((_, A.Id (_, "eval")), _, [_], []) ->
WarnOnCell
| A.Call((_, A.Id (_, "array_key_exists")), _, [_; _], []) ->
AllowCell
| A.Call((_, A.Id (_, ("idx"))), _, ([_; _] | [_; _; _]), []) ->
AllowCell
| A.Call((_, A.Id (_, ("hphp_array_idx"))), _, [_; _; _], []) ->
AllowCell
| A.Xml _ ->
AllowCell
| A.NewAnonClass _ -> ErrorOnCell
| _ -> if is_splatted then AllowCell else ErrorOnCell in
from_non_list_assignment AllowCell expr
let get_queryMOpMode need_ref op =
match op with
| QueryOp.InOut -> MemberOpMode.InOut
| QueryOp.CGet -> MemberOpMode.Warn
| QueryOp.Empty when need_ref -> MemberOpMode.Define
| _ -> MemberOpMode.ModeNone
let is_legal_lval_op_on_this op =
match op with
| LValOp.Unset -> true
| LValOp.IncDec _ -> true
| _ -> false
let check_shape_key (pos,name) =
if String.length name > 0 && String_utils.is_decimal_digit name.[0]
then Emit_fatal.raise_fatal_parse
pos "Shape key names may not start with integers"
let extract_shape_field_name_pstring = function
| A.SFlit s ->
check_shape_key s; A.String s
| A.SFclass_const ((pn, _) as id, p) -> A.Class_const ((pn, A.Id id), p)
let rec text_of_expr e_ = match e_ with
| A.Id id | A.Lvar id | A.String id -> id
| A.Array_get ((p, A.Lvar (_, id)), Some (_, e_)) ->
(p, id ^ "[" ^ snd (text_of_expr e_) ^ "]")
| _ -> Pos.none, "unknown" (* TODO: get text of expression *)
let add_include ?(doc_root=false) e =
let strip_backslash p =
let len = String.length p in
if len > 0 && p.[0] = '/' then String.sub p 1 (len-1) else p in
let rec split_var_lit = function
| _, A.Binop (A.Dot, e1, e2) -> begin
let v, l = split_var_lit e2 in
if v = ""
then let var, lit = split_var_lit e1 in var, lit ^ l
else v, ""
end
| _, A.String (_, lit) -> "", lit
| _, e_ -> snd (text_of_expr e_), "" in
let var, lit = split_var_lit e in
let var, lit =
if var = "__DIR__" then ("", strip_backslash lit) else (var, lit) in
let inc =
if var = ""
then
if not (Filename.is_relative lit)
then Hhas_symbol_refs.Absolute lit
else
if doc_root
then Hhas_symbol_refs.DocRootRelative lit
else Hhas_symbol_refs.SearchPathRelative lit
else Hhas_symbol_refs.IncludeRootRelative (var, strip_backslash lit) in
Emit_symbol_refs.add_include inc
let rec expr_and_new env instr_to_add_new instr_to_add = function
| A.AFvalue e ->
let add_instr =
if expr_starts_with_ref e then instr_add_new_elemv else instr_to_add_new
in
gather [emit_expr ~need_ref:false env e; add_instr]
| A.AFkvalue (k, v) ->
let add_instr =
if expr_starts_with_ref v then instr_add_elemv else instr_to_add
in
gather [
emit_two_exprs env (fst k) k v;
add_instr;
]
and get_local env (pos, str) =
if str = SN.SpecialIdents.dollardollar
then
match Emit_env.get_pipe_var env with
| None -> Emit_fatal.raise_fatal_runtime pos
"Pipe variables must occur only in the RHS of pipe expressions"
| Some v -> v
else Local.Named str
and check_non_pipe_local e =
match e with
| _, A.Lvar (pos, str) when str = SN.SpecialIdents.dollardollar ->
Emit_fatal.raise_fatal_parse pos
"Cannot take indirect reference to a pipe variable"
| _ -> ()
(*
and get_non_pipe_local (pos, str) =
if str = SN.SpecialIdents.dollardollar
then Emit_fatal.raise_fatal_parse pos
"Cannot take indirect reference to a pipe variable"
else Local.Named str
*)
and emit_local ~notice ~need_ref env ((pos, str) as id) =
if SN.Superglobals.is_superglobal str
then gather [
instr_string (SU.Locals.strip_dollar str);
Emit_pos.emit_pos pos;
instr (IGet (if need_ref then VGetG else CGetG))
]
else
let local = get_local env id in
if is_local_this env str && not (Emit_env.get_needs_local_this env) then
if need_ref then
instr_vgetl local
else
instr (IMisc (BareThis notice))
else if need_ref then
instr_vgetl local
else
instr_cgetl local
(* Emit CGetL2 for local variables, and return true to indicate that
* the result will be just below the top of the stack *)
and emit_first_expr env (_, e as expr) =
match e with
| A.Lvar ((_, name) as id)
when not ((is_local_this env name && not (Emit_env.get_needs_local_this env))
|| SN.Superglobals.is_superglobal name) ->
instr_cgetl2 (get_local env id), true
| _ ->
emit_expr_and_unbox_if_necessary ~need_ref:false env expr, false
(* Special case for binary operations to make use of CGetL2 *)
and emit_two_exprs env outer_pos e1 e2 =
let instrs1, is_under_top = emit_first_expr env e1 in
let instrs2 = emit_expr_and_unbox_if_necessary ~need_ref:false env e2 in
let instrs2_is_var =
match e2 with
| _, A.Lvar _ -> true
| _ -> false in
gather @@
if is_under_top
then
if instrs2_is_var
then [Emit_pos.emit_pos outer_pos; instrs2; instrs1]
else [instrs2; Emit_pos.emit_pos outer_pos; instrs1]
else
if instrs2_is_var
then [instrs1; Emit_pos.emit_pos outer_pos; instrs2]
else [instrs1; instrs2; Emit_pos.emit_pos outer_pos]
and emit_is_null env e =
match e with
| (_, A.Lvar ((_, str) as id)) when not (is_local_this env str) ->
instr_istypel (get_local env id) OpNull
| _ ->
gather [
emit_expr_and_unbox_if_necessary ~need_ref:false env e;
instr_istypec OpNull
]
and emit_binop env expr op e1 e2 =
let default () =
gather [
emit_two_exprs env (fst expr) e1 e2;
from_binop op
] in
match op with
| A.AMpamp | A.BArbar -> emit_short_circuit_op env expr
| A.Eq None ->
emit_lval_op env (fst expr) LValOp.Set e1 (Some e2)
| A.Eq (Some obop) ->
begin match binop_to_eqop obop with
| None -> emit_nyi "illegal eq op"
| Some op -> emit_lval_op env (fst expr) (LValOp.SetOp op) e1 (Some e2)
end
| _ ->
if not (optimize_null_check ())
then default ()
else
match op with
| A.EQeqeq when snd e2 = A.Null ->
emit_is_null env e1
| A.EQeqeq when snd e1 = A.Null ->
emit_is_null env e2
| A.Diff2 when snd e2 = A.Null ->
gather [
emit_is_null env e1;
instr_not
]
| A.Diff2 when snd e1 = A.Null ->
gather [
emit_is_null env e2;
instr_not
]
| _ ->
default ()
and emit_box_if_necessary need_ref instr =
if need_ref then
gather [
instr;
instr_box
]
else
instr
and emit_maybe_classname env (p,name) with_string with_instr =
let from_str s =
let e_id, _ =
Hhbc_id.Class.elaborate_id (Emit_env.get_namespace env) (p,s) in
with_string e_id in
if SU.is_static name then
let get_static =
gather [ instr_fcallbuiltin 0 0 "get_called_class"; instr_unboxr_nop ] in
with_instr get_static
else if SU.is_self name || SU.is_parent name then
let cls = Scope.get_class (Emit_env.get_scope env) in
match cls with
| Some c when c.A.c_kind = A.Ctrait ->
let get_cls =
if SU.is_self name then instr_self else instr_parent in
with_instr (gather [get_cls; instr_clsrefname])
| Some c when SU.is_self name -> from_str (snd c.A.c_name)
| Some c ->
begin match c.A.c_extends with
| (_, A.Happly ((_, parent), _)) :: _ -> from_str parent
| _ -> from_str name
end
| _ -> from_str name
else from_str name
and emit_instanceof env e1 e2 =
match (e1, e2) with
| (_, (_, A.Id id)) ->
let lhs = emit_expr ~need_ref:false env e1 in
emit_maybe_classname env id
(fun id -> gather [ lhs; instr_instanceofd id ])
(fun instr -> gather [ lhs; instr; instr_instanceof ])
| _ ->
gather [
emit_expr ~need_ref:false env e1;
emit_expr ~need_ref:false env e2;
instr_instanceof ]
and emit_is _env _e _h =
emit_nyi "is expression"
and emit_null_coalesce env e1 e2 =
let end_label = Label.next_regular () in
gather [
emit_quiet_expr env e1;
instr_dup;
instr_istypec OpNull;
instr_not;
instr_jmpnz end_label;
instr_popc;
emit_expr ~need_ref:false env e2;
instr_label end_label;
]
and emit_cast env hint expr =
let op =
begin match hint with
| A.Happly((_, id), []) ->
let id = String.lowercase_ascii id in
begin match id with
| _ when id = SN.Typehints.int
|| id = SN.Typehints.integer -> instr (IOp CastInt)
| _ when id = SN.Typehints.bool
|| id = SN.Typehints.boolean -> instr (IOp CastBool)
| _ when id = SN.Typehints.string -> instr (IOp CastString)
| _ when id = SN.Typehints.object_cast -> instr (IOp CastObject)
| _ when id = SN.Typehints.array -> instr (IOp CastArray)
| _ when id = SN.Typehints.real
|| id = SN.Typehints.double
|| id = SN.Typehints.float -> instr (IOp CastDouble)
| _ when id = "unset" -> gather [ instr_popc; instr_null ]
| _ -> emit_nyi "cast type"
end
(* TODO: unset *)
| _ ->
emit_nyi "cast type"
end in
gather [
emit_expr ~need_ref:false env expr;
op;
]
and emit_conditional_expression env etest etrue efalse =
match etrue with
| Some etrue ->
let false_label = Label.next_regular () in
let end_label = Label.next_regular () in
let opt_b, jmp_instrs = emit_jmpz_aux env etest false_label in
gather [
jmp_instrs;
(* Don't emit code for true branch if statically we know condition is false *)
optional (opt_b <> Some false)
[emit_expr ~need_ref:false env etrue; instr_jmp end_label];
instr_label false_label;
(* Don't emit code for false branch if statically we know condition is true *)
optional (opt_b <> Some true)
[emit_expr ~need_ref:false env efalse];
instr_label end_label;
]
| None ->
let end_label = Label.next_regular () in
gather [
emit_expr ~need_ref:false env etest;
instr_dup;
instr_jmpnz end_label;
instr_popc;
emit_expr ~need_ref:false env efalse;
instr_label end_label;
]
and emit_new env pos expr args uargs =
let nargs = List.length args + List.length uargs in
let cexpr = expr_to_class_expr ~resolve_self:true
(Emit_env.get_scope env) expr in
match cexpr with
(* Special case for statically-known class *)
| Class_id id ->
let fq_id, _id_opt =
Hhbc_id.Class.elaborate_id (Emit_env.get_namespace env) id in
gather [
instr_fpushctord nargs fq_id;
emit_args_and_call env pos args uargs;
instr_popr
]
| Class_static ->
gather [
instr_fpushctors nargs SpecialClsRef.Static;
emit_args_and_call env pos args uargs;
instr_popr
]
| Class_self ->
gather [
instr_fpushctors nargs SpecialClsRef.Self;
emit_args_and_call env pos args uargs;
instr_popr
]
| Class_parent ->
gather [
instr_fpushctors nargs SpecialClsRef.Parent;
emit_args_and_call env pos args uargs;
instr_popr
]
| _ ->
gather [
emit_load_class_ref env cexpr;
instr_fpushctor nargs 0;
emit_args_and_call env pos args uargs;
instr_popr
]
and emit_new_anon env pos cls_idx args uargs =
let nargs = List.length args + List.length uargs in
gather [
instr_defcls cls_idx;
instr_fpushctori nargs cls_idx;
emit_args_and_call env pos args uargs;
instr_popr
]
and emit_clone env expr =
gather [
emit_expr ~need_ref:false env expr;
instr_clone;
]
and emit_shape env expr fl =
let p = fst expr in
let fl =
List.map fl
~f:(fun (fn, e) ->
((p, extract_shape_field_name_pstring fn), e))
in
emit_expr ~need_ref:false env (p, A.Darray fl)
and emit_tuple env p es =
emit_expr ~need_ref:false env (p, A.Varray es)
and emit_call_expr ~need_ref env expr =
let instrs, flavor = emit_flavored_expr env expr in
gather [
instrs;
(* If the instruction has produced a ref then unbox it *)
if flavor = Flavor.ReturnVal then
Emit_pos.emit_pos_then (fst expr) @@
if need_ref then
instr_boxr
else
instr_unboxr
else
empty
]
and emit_known_class_id env id =
let fq_id, _ = Hhbc_id.Class.elaborate_id (Emit_env.get_namespace env) id in
gather [
instr_string (Hhbc_id.Class.to_raw_string fq_id);
instr_clsrefgetc;
]
and emit_load_class_ref env cexpr =
match cexpr with
| Class_static -> instr (IMisc (LateBoundCls 0))
| Class_parent -> instr (IMisc (Parent 0))
| Class_self -> instr (IMisc (Self 0))
| Class_id id -> emit_known_class_id env id
| Class_unnamed_local l -> instr (IGet (ClsRefGetL (l, 0)))
| Class_expr expr ->
begin match snd expr with
| A.Lvar ((_, id) as pos_id) when id <> SN.SpecialIdents.this ->
let local = get_local env pos_id in
instr (IGet (ClsRefGetL (local, 0)))
| _ ->
gather [
emit_expr ~need_ref:false env expr;
instr_clsrefgetc
]
end
and emit_load_class_const env cexpr id =
(* TODO(T21932293): HHVM does not match Zend here.
* Eventually remove this to match PHP7 *)
match Ast_scope.Scope.get_class (Emit_env.get_scope env) with
| Some cd when cd.A.c_kind = A.Ctrait
&& cexpr = Class_self
&& SU.is_class id ->
instr_string @@ SU.strip_global_ns @@ snd cd.A.c_name
| _ ->
let load_const =
if SU.is_class id
then instr (IMisc (ClsRefName 0))
else instr (ILitConst (ClsCns (Hhbc_id.Const.from_ast_name id, 0)))
in
gather [
emit_load_class_ref env cexpr;
load_const
]
and emit_class_expr_parts env cexpr prop =
let load_prop, load_prop_first =
match prop with
| _, A.Id (_, id) ->
instr_string id, true
| _, A.Lvar (_, id) ->
instr_string (SU.Locals.strip_dollar id), true
| _, A.Dollar (_, A.Lvar _ as e) ->
emit_expr ~need_ref:false env e, false
(* The outer dollar just says "class property" *)
| _, A.Dollar e | e ->
emit_expr ~need_ref:false env e, true
in
let load_cls_ref = emit_load_class_ref env cexpr in
if load_prop_first then load_prop, load_cls_ref
else load_cls_ref, load_prop
and emit_class_expr env cexpr prop =
match cexpr with
| Class_expr ((pos, (A.BracedExpr _ |
A.Dollar _ |
A.Call _ |
A.Lvar (_, "$this") |
A.Binop _ |
A.Class_get _)) as e) ->
(* if class is stored as dollar or braced expression (computed dynamically)
it needs to be stored in unnamed local and eventually cleaned.
Here we don't use stash_in_local because shape of the code generated
for class case is different (PopC / UnsetL is the part of try block) *)
let cexpr_local =
Local.scope @@ fun () -> emit_expr ~need_ref:false env e in
Local.scope @@ fun () ->
let temp = Local.get_unnamed_local () in
let instrs = emit_class_expr env (Class_unnamed_local temp) prop in
let fault_label = Label.next_fault () in
let block =
instr_try_fault
fault_label
(* try block *)
(gather [
instr_popc;
instrs;
instr_unsetl temp
])
(* fault block *)
(gather [
instr_unsetl temp;
Emit_pos.emit_pos pos;
instr_unwind ]) in
gather [
cexpr_local;
instr_setl temp;
block
]
| _ ->
let cexpr_begin, cexpr_end = emit_class_expr_parts env cexpr prop in
gather [cexpr_begin ; cexpr_end]
and emit_class_get env param_num_opt qop need_ref cid prop =
let cexpr = expr_to_class_expr ~resolve_self:false
(Emit_env.get_scope env) cid
in
gather [
emit_class_expr env cexpr prop;
match (param_num_opt, qop) with
| (None, QueryOp.CGet) -> if need_ref then instr_vgets else instr_cgets
| (None, QueryOp.CGetQuiet) -> failwith "emit_class_get: CGetQuiet"
| (None, QueryOp.Isset) -> instr_issets
| (None, QueryOp.Empty) -> instr_emptys
| (None, QueryOp.InOut) -> failwith "emit_class_get: InOut"
| (Some (i, h), _) -> instr (ICall (FPassS (i, 0, h)))
]
(* Class constant <cid>::<id>.
* We follow the logic for the Construct::KindOfClassConstantExpression
* case in emitter.cpp
*)
and emit_class_const env cid (_, id) =
let cexpr = expr_to_class_expr ~resolve_self:true
(Emit_env.get_scope env) cid in
match cexpr with
| Class_id cid ->
let fq_id, _id_opt =
Hhbc_id.Class.elaborate_id (Emit_env.get_namespace env) cid in
let fq_id_str = Hhbc_id.Class.to_raw_string fq_id in
Emit_symbol_refs.add_class fq_id_str;
if SU.is_class id
then instr_string fq_id_str
else instr (ILitConst (ClsCnsD (Hhbc_id.Const.from_ast_name id, fq_id)))
| _ ->
emit_load_class_const env cexpr id
and emit_yield env = function
| A.AFvalue e ->
gather [
emit_expr ~need_ref:false env e;
instr_yield;
]
| A.AFkvalue (e1, e2) ->
gather [
emit_expr ~need_ref:false env e1;
emit_expr ~need_ref:false env e2;
instr_yieldk;
]
and emit_execution_operator env exprs =
let instrs =
match exprs with
(* special handling of ``*)
| [_, A.String (_, "") as e] -> emit_expr ~need_ref:false env e
| _ -> emit_string2 env exprs in
gather [
instr_fpushfuncd 1 (Hhbc_id.Function.from_raw_string "shell_exec");
instrs;
instr_fpass PassByRefKind.AllowCell 0 Cell;
instr_fcall 1;
]
and emit_string2 env exprs =
match exprs with
| [e] ->
gather [
emit_expr ~need_ref:false env e;
instr (IOp CastString)
]
| e1::e2::es ->
gather @@ [
emit_two_exprs env (fst e1) e1 e2;
instr (IOp Concat);
gather (List.map es (fun e ->
gather [emit_expr ~need_ref:false env e; instr (IOp Concat)]))
]
| [] -> failwith "String2 with zero arguments is impossible"
and emit_lambda env fundef ids =
(* Closure conversion puts the class number used for CreateCl in the "name"
* of the function definition *)
let fundef_name = snd fundef.A.f_name in
let class_num = int_of_string fundef_name in
let explicit_use = SSet.mem fundef_name (Emit_env.get_explicit_use_set ()) in
gather [
gather @@ List.map ids
(fun (x, isref) ->
instr (IGet (
let lid = get_local env x in
if explicit_use
then
if isref then VGetL lid else CGetL lid
else CUGetL lid)));
instr (IMisc (CreateCl (List.length ids, class_num)))
]
and emit_id env (p, s as id) =
let s = String.uppercase_ascii s in
match s with
| "__FILE__" -> instr (ILitConst File)
| "__DIR__" -> instr (ILitConst Dir)
| "__METHOD__" -> instr (ILitConst Method)
| "__LINE__" ->
(* If the expression goes on multi lines, we return the last line *)
let _, line, _, _ = Pos.info_pos_extended p in
instr_int line
| "__NAMESPACE__" ->
let ns = Emit_env.get_namespace env in
instr_string (Option.value ~default:"" ns.Namespace_env.ns_name)
| "__COMPILER_FRONTEND__" -> instr_string "hackc"
| ("EXIT" | "DIE") ->
emit_exit env None
| _ ->
let fq_id, id_opt, contains_backslash =
Hhbc_id.Const.elaborate_id (Emit_env.get_namespace env) id in
begin match id_opt with
| Some id ->
Emit_symbol_refs.add_constant (Hhbc_id.Const.to_raw_string fq_id);
Emit_symbol_refs.add_constant id;
instr (ILitConst (CnsU (fq_id, id)))
| None ->
Emit_symbol_refs.add_constant (snd id);
instr (ILitConst
(if contains_backslash then CnsE fq_id else Cns fq_id))
end