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top-down type inference, implements rfc 149 (#20091)

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* micro implementation of rfc 149

refs https://github.com/nim-lang/RFCs/issues/149

* number/array/seq literals, more statements

* try fix number literal alias issue

* renew expectedType with if/case/try branch types

* fix (nerf) index type handling and float typed int

* use typeAllowed

* tweaks + const test (tested locally) [skip ci]

* fill out more of the checklist

* more literals, change @ order, type conversions

Not copying the full call tree before the typedesc call check
in `semIndirectOp` is also a small performance improvement.

* disable self-conversion warning

* revert type conversions (maybe separate op later)

* deal with CI for now (seems unrelated), try enums

* workaround CI different way

* proper fix

* again

* see sizes

* lol

* overload selection, simplify int literal -> float

* range, new @ solution, try use fitNode for nil

* use new magic

* try fix ranges, new magic, deal with #20193

* add documentation, support templates

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
This commit is contained in:
metagn 2022-08-24 08:11:41 +03:00 • committed by GitHub
commit 0014b9c48e
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17 changed files with 599 additions and 199 deletions
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10
compiler/semobjconstr.nim
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@ -77,7 +77,7 @@ proc semConstrField(c: PContext, flags: TExprFlags,
"the field '$1' is not accessible." % [field.name.s])
return
var initValue = semExprFlagDispatched(c, assignment[1], flags)
var initValue = semExprFlagDispatched(c, assignment[1], flags, field.typ)
if initValue != nil:
initValue = fitNodeConsiderViewType(c, field.typ, initValue, assignment.info)
assignment[0] = newSymNode(field)
@ -375,13 +375,19 @@ proc defaultConstructionError(c: PContext, t: PType, info: TLineInfo) =
else:
assert false, "Must not enter here."
proc semObjConstr(c: PContext, n: PNode, flags: TExprFlags): PNode =
proc semObjConstr(c: PContext, n: PNode, flags: TExprFlags; expectedType: PType = nil): PNode =
var t = semTypeNode(c, n[0], nil)
result = newNodeIT(nkObjConstr, n.info, t)
for child in n: result.add child
if t == nil:
return localErrorNode(c, result, "object constructor needs an object type")
if t.skipTypes({tyGenericInst,
tyAlias, tySink, tyOwned, tyRef}).kind != tyObject and
expectedType != nil and expectedType.skipTypes({tyGenericInst,
tyAlias, tySink, tyOwned, tyRef}).kind == tyObject:
t = expectedType
t = skipTypes(t, {tyGenericInst, tyAlias, tySink, tyOwned})
if t.kind == tyRef: