Joseph Ferano
df73f87b2f
The slot after a defn's parameters is unconditionally a type. Parse.decl no
longer takes a set of type names, and is_type_form, qualified_type, types_in,
declared_types and prelude_types are gone with the pre-pass that fed them.
What they were for: (Option f64) and (Some 1) are the same s-expression, so the
parser decided which it had by looking the head up in a set of the file's own
type names. Sound -- one top-level namespace means a name cannot be both a type
and a value -- and brittle, because the set had to be complete. It was wrong
twice in one day, the second time parsing (defn f [] (Rune {.code 65}) (bar))
as a function returning a Rune with a one-form body, silently, in every file in
the language.
Two things fall out. A type the parser could not have known -- a struct
declared further down the file, rl/Vector2 behind an unresolved alias, a
prelude type -- never needed recognising, only placing. And a mistyped type is
a mistyped type: (defn f [] f65 0.0) reaches the resolver's near-miss check and
says did you mean f64, where it used to be read as the first form of the body
and reported as an unknown name.
Unit is written (). The old spelling is refused with a message naming the new
one, the rule the colon-to-dot change followed. Internally it is still
Tname "Unit" and Types.Unit, so the resolver, the shim and the emitter did not
change; Cimport still builds Tname "Unit" for C's void without going through
the parser. Types.to_string prints () though -- that printer prints what a
person would write for every other type it knows, [i32], {K V}, (Ptr T), and
Unit was the odd one out once the source spelling moved.
Dropping prelude_types removes one of the two reasons Macro.reduce may only
drop defns: the memoised set a bootstrap build could have poisoned is gone, so
the remaining reason is the plain one.
125 lines
4.9 KiB
Plaintext
125 lines
4.9 KiB
Plaintext
;;;; println, one row per arm of the structural printer.
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;;;;
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;;;; The walk in render.ml is shared with the REPL, but until now its only
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;;;; coverage was the REPL tests -- and those run a dev build, where the pieces
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;;;; go to flan_dev_emit. println is the same walk with the other emitter, in
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;;;; an ordinary build, so every arm needs saying again here: the two emitters
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;;;; are the one thing the shared module does *not* make identical.
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;;;;
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;;;; Run at -O0 as well as -O2. The slice arm emits a loop over slots taken
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;;;; from the enclosing function's frame, and mem2reg is exactly the pass that
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;;;; would launder a slot mistake into working code.
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(defstruct V [x f32 y f32])
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(defstruct Blob [id i32 name string pos V tags [3 i32]])
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(defenum Colour [red 0 green 1 blue 2])
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;; Five deep, so the walk hits max_depth (4) and prints "..." rather than
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;; descending forever. A self-containing struct is the case this cap exists
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;; for; five nested ones are the same shape without needing a pointer.
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(defstruct D5 [n i32])
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(defstruct D4 [d D5])
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(defstruct D3 [d D4])
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(defstruct D2 [d D3])
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(defstruct D1 [d D2])
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(defvar b Blob)
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(defvar col Colour)
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(defvar big u64)
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(defvar small u64)
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(defvar arr [4 i32])
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(defvar wide [10 i32])
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(defvar deep D1)
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(defvar n i32)
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(defstruct Long [s string])
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(defvar long-one Long)
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(defn nothing [] () )
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(defn find-it [s [i32] k i32] (Option i32)
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(dotimes [i (len s)]
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(when (= (at s i) k) (return (Some i))))
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None)
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(defn main [] i32
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;; A string at top level prints raw. Anywhere else it is quoted, which the
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;; Blob row below shows -- the two are the same value printed two ways on
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;; purpose, and that difference is the thing most likely to be "fixed".
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(println "plain string")
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(println (bytes "plain bytes"))
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(println 42)
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(println -7)
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(set small 5)
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(println small)
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;; The u64 row. Through the signed printer this reads -1, which is the one
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;; way println could disagree with the REPL about a value both can hold.
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(set big 0xFFFFFFFFFFFFFFFF)
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(println big)
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(println 3.5)
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(println -0.25)
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(println true)
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(println false)
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;; () is evaluated and *then* reported: a () expression is a call made
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;; for its effect, so emitting () without running it would be a lie.
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(println (nothing))
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(set col :green)
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(println col)
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;; red is 0, which is also the zero value, so this row says the chain of
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;; comparisons reaches the *first* member and does not fall through to the
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;; number it is erased to.
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(set col :red)
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(println col)
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;; A pointer is its shape and is never followed -- the only thing that could
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;; make this walk cycle.
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(set n 3)
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(println (addr n))
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(println (find-it (slice wide 0 10) 0))
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(println (find-it (slice wide 0 10) 99))
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(set (.id b) 7)
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(set (.name b) "sandy \"quoted\"")
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(set (.x (.pos b)) 1.5)
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(set (.y (.pos b)) -2.0)
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(set (at (.tags b) 1) 42)
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(println b)
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(set (at arr 2) 9)
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(println arr)
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;; Ten elements against a span cap of eight: eight, then "...".
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(set (at wide 9) 1)
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(println wide)
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;; A slice's length is not known until it runs, so this is the arm that
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;; emits a loop rather than unrolling.
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(println (slice arr 1 4))
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(set (.n (.d (.d (.d (.d deep))))) 5)
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(println deep)
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;; Two slice printlns in one function, and one inside a loop: the slots the
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;; loop needs are allocated per *call site* at check time, not per iteration.
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(dotimes [i 2]
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(println (slice arr 0 2)))
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(println (slice arr 2 4))
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;; A nested string longer than the escape buffer. Escaping is the one
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;; conversion whose output is not a bounded handful of characters, so it
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;; truncates -- with an ellipsis inside the quotes, because a value that
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;; prints as a shorter value is the failure nobody notices.
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(set (.s long-one) "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")
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(println long-one)
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;; print is println without the newline.
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(print "a")
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(print "b")
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(println "c")
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0)
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