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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package typechecker
import Mode._
trait TypersTracking {
self: Analyzer =>
import global._
import typeDebug._
// To enable decent error messages when the typer crashes.
// TODO - this only catches trees which go through def typed,
// but there are all kinds of back ways - typedClassDef, etc. etc.
// Funnel everything through one doorway.
var lastTreeToTyper: Tree = EmptyTree
def fullSiteString(context: Context): String = {
def owner_long_s = (
if (settings.debug.value) {
def flags_s = context.owner.debugFlagString match {
case "" => ""
case s => " with flags " + inLightMagenta(s)
}
s", a ${context.owner.shortSymbolClass}$flags_s"
}
else ""
)
def marker = if (context.bufferErrors) "silent" else "site"
def undet_s = context.undetparams match {
case Nil => ""
case ps => ps.mkString(" solving: ", ",", "")
}
def implicits_s = (
if (context.enrichmentEnabled)
if (context.implicitsEnabled) ""
else inLightRed("enrichment only")
else inLightRed("implicits disabled")
)
s"($marker$undet_s: ${context.siteString}$owner_long_s) $implicits_s"
}
object typingStack {
val out = new java.io.PrintWriter(System.err, true)
// TODO - account for colors so the color of a multiline string
// doesn't infect the connector lines
private def currentIndent = "| " * depth
private var trees: List[Frame] = Nil
private var depth = 0
private def atLowerIndent[T](body: => T): T = {
depth -= 1
try body finally depth += 1
}
private def resetIfEmpty(s: String) = if (trees.isEmpty) resetColor(s) else s
private def truncAndOneLine(s: String): String = {
val s1 = s.replaceAll("\\s+", " ")
if (s1.length < 60 || settings.debug.value) s1 else s1.take(57) + "..."
}
private class Frame(val tree: Tree) { }
private def greenType(tp: Type): String = tpe_s(tp, inGreen)
private def greenType(tree: Tree): String = tree match {
case null => "[exception]"
case md: MemberDef if md.tpe == NoType => inBlue(s"[${md.keyword} ${md.name}]") + " " + greenType(md.symbol.tpe)
case _ if tree.tpe.isComplete => greenType(tree.tpe)
case _ => "<?>"
}
def indented(s: String): String =
if (s == "") "" else currentIndent + s.replaceAll("\n", "\n" + currentIndent)
@inline final def runWith[T](t: Tree)(body: => T): T = {
push(t)
try body finally pop(t)
}
def push(t: Tree): Unit = {
trees ::= new Frame(t)
depth += 1
}
def pop(t: Tree): Unit = {
val frame = trees.head
assert(frame.tree eq t, ((frame.tree, t)))
trees = trees.tail
depth -= 1
}
def show(s: String) { if (s != "") out.println(s) }
def showPush(tree: Tree, context: Context) {
showPush(tree, NOmode, WildcardType, context)
}
def showPush(tree: Tree, mode: Mode, pt: Type, context: Context) {
def tree_s = truncAndOneLine(ptTree(tree))
def pt_s = if (pt.isWildcard || context.inTypeConstructorAllowed) "" else s": pt=$pt"
def all_s = List(tree_s, pt_s, mode, fullSiteString(context)) filterNot (_ == "") mkString " "
atLowerIndent(show(indented("""|-- """ + all_s)))
}
def showPop(typedTree: Tree): Tree = {
val s = greenType(typedTree)
show(resetIfEmpty(indented("""\-> """ + s)))
typedTree
}
def showAdapt(original: Tree, adapted: Tree, pt: Type, context: Context) {
if (!noPrintAdapt(original, adapted)) {
def tree_s1 = inLightCyan(truncAndOneLine(ptTree(original)))
def pt_s = if (pt.isWildcard) "" else s" based on pt $pt"
def tree_s2 = adapted match {
case tt: TypeTree => "is now a TypeTree(" + tpe_s(tt.tpe, inCyan) + ")"
case _ => "adapted to " + inCyan(truncAndOneLine(ptTree(adapted))) + pt_s
}
show(indented(s"[adapt] $tree_s1 $tree_s2"))
}
}
def showTyped(tree: Tree) {
def class_s = tree match {
case _: RefTree => ""
case _ => " " + tree.shortClass
}
if (!noPrintTyping(tree))
show(indented(s"[typed$class_s] " + truncAndOneLine(ptTree(tree))))
}
def nextTyped(tree: Tree, mode: Mode, pt: Type, context: Context)(body: => Tree): Tree =
nextTypedInternal(tree, showPush(tree, mode, pt, context))(body)
def nextTypedInternal(tree: Tree, pushFn: => Unit)(body: => Tree): Tree = (
if (noPrintTyping(tree))
body
else
runWith(tree) { pushFn ; showPop(body) }
)
@inline final def printTyping(tree: Tree, s: => String) = {
if (printTypings && !noPrintTyping(tree))
show(indented(s))
}
@inline final def printTyping(s: => String) = {
if (printTypings)
show(indented(s))
}
}
def tpe_s(tp: Type, colorize: String => String): String = tp match {
case OverloadedType(pre, alts) => alts map (alt => tpe_s(pre memberType alt, colorize)) mkString " <and> "
case _ => colorize(tp.toLongString)
}
// def sym_s(s: Symbol) = if (s eq null) "" + s else s.getClass.getName split '.' last;
// Some trees which are typed with mind-numbing frequency and
// which add nothing by being printed. Did () type to Unit? Let's
// gamble on yes.
def printingOk(t: Tree) = printTypings && (settings.debug.value || !noPrint(t))
def noPrintTyping(t: Tree) = (t.tpe ne null) || !printingOk(t)
def noPrintAdapt(tree1: Tree, tree2: Tree) = !printingOk(tree1) || (
(tree1.tpe == tree2.tpe)
&& (tree1.symbol == tree2.symbol)
)
}
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