1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
package dotty.tools
package dotc
package typer
import dotty.tools.dotc.ast.Trees.NamedArg
import dotty.tools.dotc.ast.{Trees, untpd, tpd, TreeTypeMap}
import Trees._
import core._
import Flags._
import Symbols._
import Types._
import Decorators._
import Constants._
import StdNames.nme
import Contexts.Context
import Names.Name
import SymDenotations.SymDenotation
import Annotations.Annotation
import transform.ExplicitOuter
import config.Printers.inlining
import ErrorReporting.errorTree
import util.{Property, SourceFile, NoSource}
import collection.mutable
object Inliner {
import tpd._
private class InlinedBody(tree: => Tree) {
lazy val body = tree
}
private val InlinedBody = new Property.Key[InlinedBody] // to be used as attachment
val InlinedCall = new Property.Key[tpd.Inlined] // to be used in context
def attachBody(inlineAnnot: Annotation, tree: => Tree)(implicit ctx: Context): Unit =
inlineAnnot.tree.putAttachment(InlinedBody, new InlinedBody(tree))
def inlinedBody(sym: SymDenotation)(implicit ctx: Context): Tree =
sym.getAnnotation(defn.InlineAnnot).get.tree
.attachment(InlinedBody).body
private class Typer extends ReTyper {
override def typedSelect(tree: untpd.Select, pt: Type)(implicit ctx: Context): Tree = {
val acc = tree.symbol
super.typedSelect(tree, pt) match {
case res @ Select(qual, name) =>
if (name.endsWith(nme.OUTER)) {
val outerAcc = tree.symbol
println(i"selecting $tree / ${acc} / ${qual.tpe.normalizedPrefix}")
res.withType(qual.tpe.widen.normalizedPrefix)
}
else {
ensureAccessible(res.tpe, qual.isInstanceOf[Super], tree.pos)
res
}
case res => res
}
}
override def typedIf(tree: untpd.If, pt: Type)(implicit ctx: Context) = {
val cond1 = typed(tree.cond, defn.BooleanType)
cond1.tpe.widenTermRefExpr match {
case ConstantType(Constant(condVal: Boolean)) =>
val selected = typed(if (condVal) tree.thenp else tree.elsep, pt)
if (isIdempotentExpr(cond1)) selected
else Block(cond1 :: Nil, selected)
case _ =>
val if1 = untpd.cpy.If(tree)(cond = untpd.TypedSplice(cond1))
super.typedIf(if1, pt)
}
}
}
def inlineCall(tree: Tree, pt: Type)(implicit ctx: Context): Tree = {
if (ctx.inlineCount < ctx.settings.xmaxInlines.value) {
ctx.inlineCount += 1
val rhs = inlinedBody(tree.symbol)
val inlined = new Inliner(tree, rhs).inlined
try new Typer().typedUnadapted(inlined, pt)
finally ctx.inlineCount -= 1
} else errorTree(tree,
i"""Maximal number of successive inlines (${ctx.settings.xmaxInlines.value}) exceeded,
| Maybe this is caused by a recursive inline method?
| You can use -Xmax:inlines to change the limit.""")
}
def dropInlined(tree: tpd.Inlined)(implicit ctx: Context): Tree = {
val reposition = new TreeMap {
override def transform(tree: Tree)(implicit ctx: Context): Tree =
tree.withPos(tree.pos)
}
tpd.seq(tree.bindings, reposition.transform(tree.expansion))
}
def inlineContext(tree: untpd.Inlined)(implicit ctx: Context): Context =
ctx.fresh.setProperty(InlinedCall, tree)
def enclosingInlineds(implicit ctx: Context): Stream[Inlined] =
ctx.property(InlinedCall) match {
case found @ Some(inlined) =>
inlined #::
enclosingInlineds(
ctx.outersIterator.dropWhile(_.property(InlinedCall) == found).next)
case _ =>
Stream.Empty
}
def sourceFile(inlined: Inlined)(implicit ctx: Context) = {
val file = inlined.call.symbol.sourceFile
if (file.exists) new SourceFile(file) else NoSource
}
}
class Inliner(call: tpd.Tree, rhs: tpd.Tree)(implicit ctx: Context) {
import tpd._
private val meth = call.symbol
private def decomposeCall(tree: Tree): (Tree, List[Tree], List[List[Tree]]) = tree match {
case Apply(fn, args) =>
val (meth, targs, argss) = decomposeCall(fn)
(meth, targs, argss :+ args)
case TypeApply(fn, targs) =>
val (meth, Nil, Nil) = decomposeCall(fn)
(meth, targs, Nil)
case _ =>
(tree, Nil, Nil)
}
private val (methPart, targs, argss) = decomposeCall(call)
private lazy val prefix = methPart match {
case Select(qual, _) => qual
case _ => tpd.This(ctx.owner.enclosingClass.asClass)
}
private val replacement = new mutable.HashMap[Type, NamedType]
private val paramBindings = paramBindingsOf(meth.info, targs, argss)
private def paramBindingsOf(tp: Type, targs: List[Tree], argss: List[List[Tree]]): List[MemberDef] = tp match {
case tp: PolyType =>
val bindings =
(tp.paramNames, targs).zipped.map { (name, arg) =>
val tparam = newSym(name, EmptyFlags, TypeAlias(arg.tpe.stripTypeVar)).asType
TypeDef(tparam)
}
bindings ::: paramBindingsOf(tp.resultType, Nil, argss)
case tp: MethodType =>
val bindings =
(tp.paramNames, tp.paramTypes, argss.head).zipped.map { (name, paramtp, arg) =>
def isByName = paramtp.dealias.isInstanceOf[ExprType]
val (paramFlags, paramType) =
if (isByName) (Method, ExprType(arg.tpe)) else (EmptyFlags, arg.tpe)
val vparam = newSym(name, paramFlags, paramType).asTerm
if (isByName) DefDef(vparam, arg) else ValDef(vparam, arg)
}
bindings ::: paramBindingsOf(tp.resultType, targs, argss.tail)
case _ =>
assert(targs.isEmpty)
assert(argss.isEmpty)
Nil
}
private def newSym(name: Name, flags: FlagSet, info: Type): Symbol =
ctx.newSymbol(ctx.owner, name, flags, info, coord = call.pos)
private def registerType(tpe: Type): Unit =
if (!replacement.contains(tpe)) tpe match {
case tpe: ThisType =>
if (!ctx.owner.isContainedIn(tpe.cls) && !tpe.cls.is(Package))
if (tpe.cls.isStaticOwner)
replacement(tpe) = tpe.cls.sourceModule.termRef
else {
def outerDistance(cls: Symbol): Int = {
assert(cls.exists, i"not encl: ${meth.owner.enclosingClass} ${tpe.cls}")
if (tpe.cls eq cls) 0
else outerDistance(cls.owner.enclosingClass) + 1
}
val n = outerDistance(meth.owner)
replacement(tpe) = newSym(nme.SELF ++ n.toString, EmptyFlags, tpe.widen).termRef
}
case tpe: NamedType if tpe.symbol.is(Param) && tpe.symbol.owner == meth =>
val Some(binding) = paramBindings.find(_.name == tpe.name)
replacement(tpe) =
if (tpe.name.isTypeName) binding.symbol.typeRef else binding.symbol.termRef
case _ =>
}
private def registerLeaf(tree: Tree): Unit = tree match {
case _: This | _: Ident => registerType(tree.tpe)
case _ =>
}
private def outerLevel(sym: Symbol) = sym.name.drop(nme.SELF.length).toString.toInt
val inlined = {
rhs.foreachSubTree(registerLeaf)
val accessedSelfSyms =
(for ((tp: ThisType, ref) <- replacement) yield ref.symbol.asTerm).toSeq.sortBy(outerLevel)
val outerBindings = new mutable.ListBuffer[MemberDef]
for (selfSym <- accessedSelfSyms) {
val rhs =
if (outerBindings.isEmpty) prefix
else {
val lastSelf = outerBindings.last.symbol
val outerDelta = outerLevel(selfSym) - outerLevel(lastSelf)
def outerSelect(ref: Tree, dummy: Int): Tree = ???
//ref.select(ExplicitOuter.outerAccessorTBD(ref.tpe.widen.classSymbol.asClass))
(ref(lastSelf) /: (0 until outerDelta))(outerSelect)
}
outerBindings += ValDef(selfSym, rhs.ensureConforms(selfSym.info))
}
outerBindings ++= paramBindings
val typeMap = new TypeMap {
def apply(t: Type) = t match {
case _: SingletonType => replacement.getOrElse(t, t)
case _ => mapOver(t)
}
}
def treeMap(tree: Tree) = tree match {
case _: This | _: Ident =>
replacement.get(tree.tpe) match {
case Some(t) => ref(t)
case None => tree
}
case _ => tree
}
val inliner = new TreeTypeMap(typeMap, treeMap, meth :: Nil, ctx.owner :: Nil)
val Block(bindings: List[MemberDef], expansion) =
inliner(Block(outerBindings.toList, rhs)).withPos(call.pos)
val result = tpd.Inlined(call, bindings, expansion)
inlining.println(i"inlining $call\n --> \n$result")
result
}
}
|