rename expression heads for type definitions to match keywords

NEWS.md

@@ -35,6 +35,13 @@ Language changes
   * Nested `if` expressions that arise from the keyword `elseif` now use `elseif`
     as their expression head instead of `if` ([#21774]).
 
+  * Parsed and lowered forms of type definitions have been synchronized with their
+    new keywords ([#23157]). Expression heads are renamed as follows:
+    `type`           => `struct`
+    `bitstype`       => `primitive` (order of arguments is also reversed, to match syntax)
+    `composite_type` => `struct_type`
+    `bits_type`      => `primitive_type`
+
 Breaking changes
 ----------------
 

base/docs/Docs.jl

@@ -463,7 +463,7 @@ function nameof(x::Expr, ismacro)
     if isexpr(x, :.)
         ismacro ? macroname(x) : x
     else
-        n = isexpr(x, (:module, :type, :bitstype)) ? 2 : 1
+        n = isexpr(x, (:module, :struct)) ? 2 : 1
         nameof(x.args[n], ismacro)
     end
 end
@@ -505,7 +505,7 @@ function metadata(__source__, __module__, expr, ismodule)
     else
         push!(args, Pair(:module, __module__))
     end
-    if isexpr(expr, :type)
+    if isexpr(expr, :struct)
         # Field docs for concrete types.
         fields = []
         tmp = nothing
@@ -685,11 +685,11 @@ function docm(source::LineNumberNode, mod::Module, meta, ex, define = true)
 
     # Type definitions.
     #
-    #   type T ... end
-    #   abstract T
-    #   bitstype N T
+    #   struct T ... end
+    #   abstract type T end
+    #   primitive type T N end
     #
-    isexpr(x, [:type, :abstract, :bitstype]) ? objectdoc(source, mod, meta, def, x) :
+    isexpr(x, [:struct, :abstract, :primitive]) ? objectdoc(source, mod, meta, def, x) :
 
     # "Bindings". Names that resolve to objects with different names, ie.
     #

base/show.jl

@@ -901,13 +901,13 @@ function show_unquoted(io::IO, ex::Expr, indent::Int, prec::Int)
         print(io, "end")
 
     # type declaration
-    elseif head === :type && nargs==3
+    elseif head === :struct && nargs==3
         show_block(io, args[1] ? Symbol("mutable struct") : Symbol("struct"), args[2], args[3], indent)
         print(io, "end")
 
-    elseif head === :bitstype && nargs == 2
+    elseif head === :primitive && nargs == 2
         print(io, "primitive type ")
-        show_list(io, reverse(args), ' ', indent)
+        show_list(io, args, ' ', indent)
         print(io, " end")
 
     elseif head === :abstract && nargs == 1

doc/src/devdocs/ast.md

@@ -516,8 +516,8 @@ end
 parses as:
 
 ```
-(type true (curly Foo (<: T S))
-      (block (line 2) (:: x T)))
+(struct true (curly Foo (<: T S))
+        (block (line 2) (:: x T)))
 ```
 
 The first argument is a boolean telling whether the type is mutable.

doc/src/devdocs/functions.md

@@ -243,7 +243,7 @@ The front end generates type declarations for all closures. Initially, this was
 generating normal type declarations. However, this produced an extremely large number of constructors,
 all of which were trivial (simply passing all arguments through to `new`). Since methods are partially
 ordered, inserting all of these methods is O(n^2), plus there are just too many of them to keep
-around. This was optimized by generating `composite_type` expressions directly (bypassing default
+around. This was optimized by generating `struct_type` expressions directly (bypassing default
 constructor generation), and using `new` directly to create closure instances. Not the prettiest
 thing ever, but you do what you gotta do.
 

doc/src/devdocs/init.md

@@ -40,13 +40,13 @@ type description objects for the [built-in types defined in `julia.h`](https://g
 e.g.
 
 ```c
-jl_any_type = jl_new_abstracttype(jl_symbol("Any"), NULL, jl_null);
+jl_any_type = jl_new_abstracttype(jl_symbol("Any"), core, NULL, jl_emptysvec);
 jl_any_type->super = jl_any_type;
 
-jl_type_type = jl_new_abstracttype(jl_symbol("Type"), jl_any_type, jl_null);
+jl_type_type = jl_new_abstracttype(jl_symbol("Type"), core, jl_any_type, jl_emptysvec);
 
-jl_int32_type = jl_new_bitstype(jl_symbol("Int32"),
-                                jl_any_type, jl_null, 32);
+jl_int32_type = jl_new_primitivetype(jl_symbol("Int32"), core,
+                                     jl_any_type, jl_emptysvec, 32);
 ```
 
 [`jl_init_tasks()`](https://github.com/JuliaLang/julia/blob/master/src/task.c) creates the `jl_datatype_t* jl_task_type`

src/ast.c

@@ -44,8 +44,8 @@ jl_sym_t *exc_sym;     jl_sym_t *error_sym;
 jl_sym_t *new_sym;     jl_sym_t *using_sym;
 jl_sym_t *const_sym;   jl_sym_t *thunk_sym;
 jl_sym_t *anonymous_sym;  jl_sym_t *underscore_sym;
-jl_sym_t *abstracttype_sym; jl_sym_t *bitstype_sym;
-jl_sym_t *compositetype_sym; jl_sym_t *foreigncall_sym;
+jl_sym_t *abstracttype_sym; jl_sym_t *primtype_sym;
+jl_sym_t *structtype_sym; jl_sym_t *foreigncall_sym;
 jl_sym_t *global_sym; jl_sym_t *list_sym;
 jl_sym_t *dot_sym;    jl_sym_t *newvar_sym;
 jl_sym_t *boundscheck_sym; jl_sym_t *inbounds_sym;
@@ -414,8 +414,8 @@ void jl_init_frontend(void)
     underscore_sym = jl_symbol("_");
     amp_sym = jl_symbol("&");
     abstracttype_sym = jl_symbol("abstract_type");
-    bitstype_sym = jl_symbol("bits_type");
-    compositetype_sym = jl_symbol("composite_type");
+    primtype_sym = jl_symbol("primitive_type");
+    structtype_sym = jl_symbol("struct_type");
     toplevel_sym = jl_symbol("toplevel");
     dot_sym = jl_symbol(".");
     boundscheck_sym = jl_symbol("boundscheck");

src/builtins.c

@@ -600,7 +600,7 @@ JL_CALLABLE(jl_f_svec)
     return (jl_value_t*)t;
 }
 
-// composite types ------------------------------------------------------------
+// struct operations ------------------------------------------------------------
 
 JL_CALLABLE(jl_f_getfield)
 {

src/codegen.cpp

@@ -3859,8 +3859,8 @@ static jl_cgval_t emit_expr(jl_codectx_t &ctx, jl_value_t *expr)
             ctx.builder.CreateCall(prepare_call(jltopeval_func), args);
             return ghostValue(jl_void_type);
         }
-        if (head == abstracttype_sym || head == compositetype_sym ||
-            head == bitstype_sym) {
+        if (head == abstracttype_sym || head == structtype_sym ||
+            head == primtype_sym) {
             jl_errorf("type definition not allowed inside a local scope");
         }
         else {

src/interpreter.c

@@ -391,7 +391,7 @@ static jl_value_t *eval(jl_value_t *e, interpreter_state *s)
         JL_GC_POP();
         return (jl_value_t*)jl_nothing;
     }
-    else if (ex->head == bitstype_sym) {
+    else if (ex->head == primtype_sym) {
         if (inside_typedef)
             jl_error("cannot eval a new bits type definition while defining another type");
         jl_value_t *name = args[0];
@@ -439,7 +439,7 @@ static jl_value_t *eval(jl_value_t *e, interpreter_state *s)
         JL_GC_POP();
         return (jl_value_t*)jl_nothing;
     }
-    else if (ex->head == compositetype_sym) {
+    else if (ex->head == structtype_sym) {
         if (inside_typedef)
             jl_error("cannot eval a new data type definition while defining another type");
         jl_value_t *name = args[0];

src/julia-parser.scm

@@ -1252,7 +1252,7 @@
   (if (reserved-word? (peek-token s))
       (error (string "invalid type name \"" (take-token s) "\"")))
   (let ((sig (parse-subtype-spec s)))
-    (begin0 (list 'type (if mut? 'true 'false) sig (parse-block s))
+    (begin0 (list 'struct (if mut? 'true 'false) sig (parse-block s))
             (expect-end s word))))
 
 ;; consume any number of line endings from a token stream
@@ -1400,7 +1400,7 @@
             (begin (take-token s)
                    (let* ((spec (with-space-sensitive (parse-subtype-spec s)))
                           (nb   (with-space-sensitive (parse-cond s))))
-                     (begin0 (list 'bitstype nb spec)
+                     (begin0 (list 'primitive spec nb)
                              (expect-end (take-lineendings s) "primitive type"))))))
        ;; deprecated type keywords
        ((type)
@@ -1414,7 +1414,7 @@
                (spec (parse-subtype-spec s)))
           (syntax-deprecation s (string "bitstype " (deparse nb) " " (deparse spec))
                               (string "primitive type " (deparse spec) " " (deparse nb) " end"))
-          (list 'bitstype nb spec)))
+          (list 'primitive spec nb)))
        ((typealias)
         (let ((lhs (with-space-sensitive (parse-call s)))
               (rhs (parse-where s parse-call)))

src/julia-syntax.scm

@@ -887,9 +887,9 @@
          (global ,name) (const ,name)
          ,@(map (lambda (v) `(local ,v)) params)
          ,@(map (lambda (n v) (make-assignment n (bounds-to-TypeVar v))) params bounds)
-         (composite_type ,name (call (core svec) ,@params)
-                         (call (core svec) ,@(map (lambda (x) `',x) field-names))
-                         ,super (call (core svec) ,@field-types) ,mut ,min-initialized)))
+         (struct_type ,name (call (core svec) ,@params)
+                      (call (core svec) ,@(map (lambda (x) `',x) field-names))
+                      ,super (call (core svec) ,@field-types) ,mut ,min-initialized)))
        ;; "inner" constructors
        (scope-block
         (block
@@ -925,7 +925,7 @@
        ,@(map (lambda (n v) (make-assignment n (bounds-to-TypeVar v))) params bounds)
        (abstract_type ,name (call (core svec) ,@params) ,super))))))
 
-(define (bits-def-expr n name params super)
+(define (primitive-type-def-expr n name params super)
   (receive
    (params bounds) (sparam-name-bounds params)
    `(block
@@ -934,7 +934,7 @@
       (block
        ,@(map (lambda (v) `(local ,v)) params)
        ,@(map (lambda (n v) (make-assignment n (bounds-to-TypeVar v))) params bounds)
-       (bits_type ,name (call (core svec) ,@params) ,n ,super))))))
+       (primitive_type ,name (call (core svec) ,@params) ,n ,super))))))
 
 ;; take apart a type signature, e.g. T{X} <: S{Y}
 (define (analyze-type-sig ex)
@@ -1188,7 +1188,7 @@
         (else
          (error "invalid macro definition"))))
 
-(define (expand-type-def e)
+(define (expand-struct-def e)
   (let ((mut (cadr e))
         (sig (caddr e))
         (fields (cdr (cadddr e))))
@@ -1892,7 +1892,11 @@
    '->             expand-arrow
    'let            expand-let
    'macro          expand-macro-def
-   'type           expand-type-def
+   'struct         expand-struct-def
+   'type
+   (lambda (e)
+     (syntax-deprecation #f ":type expression head" ":struct")
+     (expand-struct-def e))
    'try            expand-try
    ;; deprecated in 0.6
    'typealias      (lambda (e) (expand-typealias (cadr e) (caddr e)))
@@ -2084,11 +2088,15 @@
 
    'bitstype
    (lambda (e)
-     (let ((n (cadr e))
-           (sig (caddr e)))
+     (syntax-deprecation #f "Expr(:bitstype, nbits, name)" "Expr(:primitive, name, nbits)")
+     (expand-forms `(primitive ,(caddr e) ,(cadr e))))
+   'primitive
+   (lambda (e)
+     (let ((sig (cadr e))
+           (n   (caddr e)))
        (expand-forms
         (receive (name params super) (analyze-type-sig sig)
-                 (bits-def-expr n name params super)))))
+                 (primitive-type-def-expr n name params super)))))
 
    'comparison
    (lambda (e) (expand-forms (expand-compare-chain (cdr e))))
@@ -2781,21 +2789,21 @@ f(x) = yt(x)
         (() () 0 ())
         (body (global ,name) (const ,name)
               ,@(map (lambda (p n) `(= ,p (call (core TypeVar) ',n (core Any)))) P names)
-              (composite_type ,name (call (core svec) ,@P)
-                              (call (core svec) ,@(map (lambda (v) `',v) fields))
-                              ,super
-                              (call (core svec) ,@types) false ,(length fields))
+              (struct_type ,name (call (core svec) ,@P)
+                           (call (core svec) ,@(map (lambda (v) `',v) fields))
+                           ,super
+                           (call (core svec) ,@types) false ,(length fields))
               (return (null))))))))
 
 (define (type-for-closure name fields super)
   `((thunk (lambda ()
             (() () 0 ())
             (body (global ,name) (const ,name)
-                  (composite_type ,name (call (core svec))
-                                  (call (core svec) ,@(map (lambda (v) `',v) fields))
-                                  ,super
-                                  (call (core svec) ,@(map (lambda (v) '(core Any)) fields))
-                                  false ,(length fields))
+                  (struct_type ,name (call (core svec))
+                               (call (core svec) ,@(map (lambda (v) `',v) fields))
+                               ,super
+                               (call (core svec) ,@(map (lambda (v) '(core Any)) fields))
+                               false ,(length fields))
                   (return (null)))))))
 
 
@@ -2808,20 +2816,20 @@ f(x) = yt(x)
 ;        `((global ,name)
 ;          (const ,name)
 ;          ,@(map (lambda (p n) `(= ,p (call (core TypeVar) ',n (core Any)))) P names)
-;          (composite_type ,name (call (core svec) ,@P)
-;                          (call (core svec) ,@(map (lambda (v) `',v) fields))
-;                          ,super
-;                          (call (core svec) ,@types) false ,(length fields)))))
+;          (struct_type ,name (call (core svec) ,@P)
+;                       (call (core svec) ,@(map (lambda (v) `',v) fields))
+;                       ,super
+;                       (call (core svec) ,@types) false ,(length fields)))))
 
 ;; ... and without parameters
 ;(define (type-for-closure name fields super)
 ;  `((global ,name)
 ;    (const ,name)
-;    (composite_type ,name (call (core svec))
-;                    (call (core svec) ,@(map (lambda (v) `',v) fields))
-;                    ,super
-;                    (call (core svec) ,@(map (lambda (v) 'Any) fields))
-;                    false ,(length fields))))
+;    (struct_type ,name (call (core svec))
+;                 (call (core svec) ,@(map (lambda (v) `',v) fields))
+;                 ,super
+;                 (call (core svec) ,@(map (lambda (v) 'Any) fields))
+;                 false ,(length fields))))
 
 
 (define (vinfo:not-capt vi)
@@ -3634,25 +3642,25 @@ f(x) = yt(x)
             ((isdefined) (if tail (emit-return e) e))
 
             ;; top level expressions returning values
-            ((abstract_type bits_type composite_type thunk toplevel module)
+            ((abstract_type primitive_type struct_type thunk toplevel module)
              (case (car e)
                ((abstract_type)
                 (let* ((para (compile (caddr e) break-labels #t #f))
                        (supe (compile (cadddr e) break-labels #t #f)))
                   (emit `(abstract_type ,(cadr e) ,para ,supe))))
-               ((bits_type)
+               ((primitive_type)
                 (let* ((para (compile (caddr e) break-labels #t #f))
                        (supe (compile (list-ref e 4) break-labels #t #f)))
-                  (emit `(bits_type ,(cadr e) ,para ,(cadddr e) ,supe))))
-               ((composite_type)
+                  (emit `(primitive_type ,(cadr e) ,para ,(cadddr e) ,supe))))
+               ((struct_type)
                 (let* ((para (compile (caddr e) break-labels #t #f))
                        (supe (compile (list-ref e 4) break-labels #t #f))
-                       ;; composite_type has an unconventional evaluation rule that
+                       ;; struct_type has an unconventional evaluation rule that
                        ;; needs to do work around the evaluation of the field types,
                        ;; so the field type expressions need to be kept in place as
                        ;; much as possible. (part of issue #21923)
                        (ftys (compile (list-ref e 5) break-labels #t #f #f)))
-                  (emit `(composite_type ,(cadr e) ,para ,(cadddr e) ,supe ,ftys ,@(list-tail e 6)))))
+                  (emit `(struct_type ,(cadr e) ,para ,(cadddr e) ,supe ,ftys ,@(list-tail e 6)))))
                (else
                 (emit e)))
              (if tail (emit-return '(null)))

src/julia_internal.h

@@ -986,8 +986,8 @@ extern jl_sym_t *exc_sym;     extern jl_sym_t *new_sym;
 extern jl_sym_t *compiler_temp_sym; extern jl_sym_t *foreigncall_sym;
 extern jl_sym_t *const_sym;   extern jl_sym_t *thunk_sym;
 extern jl_sym_t *anonymous_sym;  extern jl_sym_t *underscore_sym;
-extern jl_sym_t *abstracttype_sym; extern jl_sym_t *bitstype_sym;
-extern jl_sym_t *compositetype_sym;
+extern jl_sym_t *abstracttype_sym; extern jl_sym_t *primtype_sym;
+extern jl_sym_t *structtype_sym;
 extern jl_sym_t *global_sym; extern jl_sym_t *unused_sym;
 extern jl_sym_t *boundscheck_sym; extern jl_sym_t *inbounds_sym;
 extern jl_sym_t *copyast_sym; extern jl_sym_t *fastmath_sym;