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Support MatchType for SemanticDB #14608

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Merged
merged 15 commits into from
Apr 3, 2022
Merged

Support MatchType for SemanticDB #14608

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7817912
Add generated semanticdb source code
tanishiking Mar 2, 2022
0480dec
Support MatchType in semanticdb
tanishiking Mar 2, 2022
fa4cb01
Remove LambdaType
tanishiking Mar 2, 2022
28d59a0
Assign types to type variables in match case types
tanishiking Mar 4, 2022
2ca6fb2
Remove `case` property from the symbol of type variable
tanishiking Mar 17, 2022
4fa62e2
Don't craft the NamedType symbol
tanishiking Mar 21, 2022
2693983
Merge branches for TypeRef/TermRef with Symbol and Name
tanishiking Mar 21, 2022
18b8901
Add undefined type case for TypeRef with no symbols
tanishiking Mar 22, 2022
b070667
Retrieve a symbol for typeref to refinements in RefinedType
tanishiking Mar 22, 2022
60c336e
Resolve symbols in refinements by fake symbols
tanishiking Mar 30, 2022
be31d56
Resolve symbol occurrences of select type fields
tanishiking Mar 30, 2022
9375ab1
Resolve real symbol from nested refined type
tanishiking Mar 31, 2022
50a43b9
No need to resolve fake symbols from RefinedTypes
tanishiking Mar 31, 2022
8465366
Dealias type for looking up symbols in refinements
tanishiking Apr 1, 2022
ba24fe1
Add test file for semanticdb and ignore symbol lookup failures
tanishiking Apr 1, 2022
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27 changes: 14 additions & 13 deletions compiler/src/dotty/tools/dotc/semanticdb/ExtractSemanticDB.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -420,19 +420,20 @@ class ExtractSemanticDB extends Phase:
else
val symkinds = mutable.HashSet.empty[SymbolKind]
tree match
case tree: ValDef =>
if !tree.symbol.is(Param) then
symkinds += (if tree.mods is Mutable then SymbolKind.Var else SymbolKind.Val)
if tree.rhs.isEmpty && !tree.symbol.isOneOf(TermParam | CaseAccessor | ParamAccessor) then
symkinds += SymbolKind.Abstract
case tree: DefDef =>
if tree.isSetterDef then
symkinds += SymbolKind.Setter
else if tree.rhs.isEmpty then
symkinds += SymbolKind.Abstract
case tree: Bind =>
symkinds += SymbolKind.Val
case _ =>
case tree: ValDef =>
if !tree.symbol.is(Param) then
symkinds += (if tree.mods is Mutable then SymbolKind.Var else SymbolKind.Val)
if tree.rhs.isEmpty && !tree.symbol.isOneOf(TermParam | CaseAccessor | ParamAccessor) then
symkinds += SymbolKind.Abstract
case tree: DefDef =>
if tree.isSetterDef then
symkinds += SymbolKind.Setter
else if tree.rhs.isEmpty then
symkinds += SymbolKind.Abstract
// if symbol isType, it's type variable
case tree: Bind if (!tree.symbol.isType) =>
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@tanishiking tanishiking Mar 4, 2022

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Added !tree.symbol.isType here, to misinterpret the type variable symbol as Val
This change makes type variables like local0 => case val method N$1 <: Nat to local0 => case type N$1 <: Nat.

Other diffs: just indented.
symkinds += SymbolKind.Val
case _ =>
symkinds.toSet

private def ctorParams(
Expand Down
7 changes: 6 additions & 1 deletion compiler/src/dotty/tools/dotc/semanticdb/PPrint.scala
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Expand Up @@ -191,7 +191,12 @@ class SymbolInformationPrinter (symtab: PrinterSymtab):
s"=> ${normal(utpe)}"
case RepeatedType(utpe) =>
s"${normal(utpe)}*"
case _ =>
case MatchType(scrutinee, cases) =>
val casesStr = cases.map { caseType =>
s"${pprint(caseType.key)} => ${pprint(caseType.body)}"
}.mkString(", ")
s"${pprint(scrutinee)} match { ${casesStr} }"
case x =>
"<?>"

def normal(tpe: Type): String = tpe match
Expand Down
40 changes: 38 additions & 2 deletions compiler/src/dotty/tools/dotc/semanticdb/TypeOps.scala
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Expand Up @@ -15,6 +15,7 @@ import collection.mutable

import dotty.tools.dotc.{semanticdb => s}
import Scala3.{FakeSymbol, SemanticSymbol, WildcardTypeSymbol, TypeParamRefSymbol, TermParamRefSymbol, RefinementSymbol}
import dotty.tools.dotc.core.Names.Designator

class TypeOps:
import SymbolScopeOps._
Expand Down Expand Up @@ -81,6 +82,10 @@ class TypeOps:
else
enterParamRef(lam.resType)

// for CaseType `case Array[t] => t` which is represented as [t] =>> MatchCase[Array[t], t]
case m: MatchType =>
m.cases.foreach(enterParamRef)

// for class constructor
// class C[T] { ... }
case cls: ClassInfo if sym.info.isInstanceOf[LambdaType] =>
Expand Down Expand Up @@ -228,6 +233,14 @@ class TypeOps:
val ssym = sym.symbolName
s.TypeRef(spre, ssym, Seq.empty)

case TypeRef(pre, sym: Name) =>
// val spre = if tpe.hasTrivialPrefix then s.Type.Empty else loop(pre)
// Craft semanticdb symbol
// prefix symbol (e.g. "scala/") + name (e.g. "Nothing") + Global symbol suffix ("#")
// see: https://scalameta.org/docs/semanticdb/specification.html#symbol
val ssym = s"${pre.typeSymbol.symbolName}${sym.mangledString}#"
s.TypeRef(s.Type.Empty, ssym, Seq.empty)
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@tanishiking tanishiking Mar 4, 2022

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x *: xs part of

type Concat[Xs <: Tuple, +Ys <: Tuple] <: Tuple = Xs match case EmptyTuple => Ys case x *: xs => x *: Concat[xs, Ys]

have TypeRef(..., Nothing) (where Nothing is just a Name instead of Symbol), and we can't access the symbol for Nothing here. Therefore, craft the symbol for TyperRef for this.
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@bishabosha bishabosha Mar 21, 2022

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Can we also try to compute the type of the prefix in case is is not empty?
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@bishabosha bishabosha Mar 21, 2022 •
edited
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also perhaps this could be merged with the branch above (so only test for case tr @ TypeRef(pre, _)) - tr.symbol will just return the symbol if there already is one
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@tanishiking tanishiking Mar 21, 2022

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also perhaps this could be merged with the branch above

Right!

2693983
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@bishabosha bishabosha Mar 21, 2022

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it seems calling checkTrivialPrefix is causing a lot of crashes because it is potentially checking the owner of NoSymbol

case TermRef(pre, sym: Symbol) =>
val spre = if(tpe.hasTrivialPrefix) s.Type.Empty else loop(pre)
val ssym = sym.symbolName
Expand Down Expand Up @@ -276,6 +289,31 @@ class TypeOps:
case ConstantType(const) =>
s.ConstantType(const.toSemanticConst)

case matchType: MatchType =>
val scases = matchType.cases.map { caseType => caseType match {
case lam: HKTypeLambda => // case Array[t] => t
val paramSyms = lam.paramNames.flatMap { paramName =>
val key = (lam, paramName)
paramRefSymtab.get(key)
}.sscope
lam.resType match {
case defn.MatchCase(key, body) =>
s.MatchType.CaseType(
loop(key),
loop(body)
)
case _ => s.MatchType.CaseType() // shouldn't happen
}
case defn.MatchCase(key, body) =>
val skey = loop(key)
val sbody = loop(body)
s.MatchType.CaseType(skey, sbody)
case _ => s.MatchType.CaseType() // shouldn't happen
}}
val sscrutinee = loop(matchType.scrutinee)
val sbound = loop(matchType.bound)
s.MatchType(sscrutinee, scases)

case rt @ RefinedType(parent, name, info) =>
// `X { def x: Int; def y: Int }`
// RefinedType(
Expand Down Expand Up @@ -405,8 +443,6 @@ class TypeOps:
// Not yet supported
case _: HKTypeLambda =>
s.Type.Empty
case _: MatchType =>
s.Type.Empty

case tvar: TypeVar =>
loop(tvar.stripped)
Expand Down
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