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/* NSC -- new Scala compiler
* Copyright 2005-2006 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.ast
import scala.tools.nsc.util.Position
import symtab.Flags._
abstract class TreeGen {
val global: Global
import global._
import definitions._
import posAssigner.atPos
/** Builds a reference to value whose type is given stable prefix.
*/
def mkAttributedQualifier(tpe: Type): Tree = tpe match {
case NoPrefix =>
EmptyTree
case ThisType(clazz) =>
if (clazz.isRoot || clazz.isEmptyPackageClass) EmptyTree
else mkAttributedThis(clazz)
case SingleType(pre, sym) =>
val qual = mkAttributedStableRef(pre, sym)
qual.tpe match {
case MethodType(List(), restpe) =>
Apply(qual, List()) setType restpe
case _ =>
qual
}
case TypeRef(pre, sym, args) =>
assert(phase.erasedTypes)
if (sym.isModuleClass && !sym.isRoot) {
val qual = mkAttributedSelect(mkAttributedQualifier(sym.owner.tpe), sym.sourceModule);
qual.tpe match {
case MethodType(List(), restpe) =>
Apply(qual, List()) setType restpe
case _ =>
qual
}
} else mkAttributedThis(sym)
case _ =>
throw new Error("bad qualifier: " + tpe)
}
/** Builds a reference to given symbol with given stable prefix. */
def mkAttributedRef(pre: Type, sym: Symbol): Tree = {
val qual = mkAttributedQualifier(pre)
if (qual == EmptyTree) mkAttributedIdent(sym)
else mkAttributedSelect(qual, sym)
}
/** Builds a reference to given symbol. */
def mkAttributedRef(sym: Symbol): Tree =
if (sym.owner.isClass) mkAttributedRef(sym.owner.thisType, sym)
else mkAttributedIdent(sym)
/** Replaces tree type with a stable type if possible */
def stabilize(tree: Tree): Tree = tree match {
case Ident(_) =>
if (tree.symbol.isStable) tree.setType(singleType(tree.symbol.owner.thisType, tree.symbol))
else tree
case Select(qual, _) =>
assert(tree.symbol != null)
assert(qual.tpe != null)
if (tree.symbol.isStable && qual.tpe.isStable)
tree.setType(singleType(qual.tpe, tree.symbol))
else tree
case _ =>
tree
}
/** Cast `tree' to type `pt' */
def mkAttributedCast(tree: Tree, pt: Type): Tree = {
if (settings.debug.value) log("casting " + tree + ":" + tree.tpe + " to " + pt)
assert(!tree.tpe.isInstanceOf[MethodType], tree)
typer.typed {
atPos(tree.pos) {
Apply(TypeApply(mkAttributedSelect(tree, Object_asInstanceOf), List(TypeTree(pt))), List())
}
}
}
/** Builds a reference with stable type to given symbol */
def mkAttributedStableRef(pre: Type, sym: Symbol): Tree =
stabilize(mkAttributedRef(pre, sym))
def mkAttributedStableRef(sym: Symbol): Tree =
stabilize(mkAttributedRef(sym))
def mkAttributedThis(sym: Symbol): Tree =
This(sym.name) setSymbol sym setType sym.thisType
def mkAttributedIdent(sym: Symbol): Tree = {
assert(sym.isTerm)
Ident(sym.name) setSymbol sym setType sym.tpe
}
def mkAttributedSelect(qual: Tree, sym: Symbol): Tree =
if (qual.symbol != null &&
(qual.symbol.name.toTermName == nme.ROOT ||
qual.symbol.name.toTermName == nme.EMPTY_PACKAGE_NAME)) {
mkAttributedIdent(sym)
} else {
assert(sym.isTerm)
val result = Select(qual, sym.name) setSymbol sym
if (qual.tpe != null) result setType qual.tpe.memberType(sym)
result
}
/** Builds an instance test with given value and type. */
def mkIsInstanceOf(value: Tree, tpe: Type, erased: Boolean): Tree = { // buraq: we ignore erase, no rtt
val sym = definitions.Any_isInstanceOf
/*
val sym =
if (erased) definitions.Any_isInstanceOfErased
else definitions.Any_isInstanceOf
*/
Apply(
TypeApply(
mkAttributedSelect(value, sym),
List(TypeTree(tpe))),
List())
}
def mkIsInstanceOf(value: Tree, tpe: Type): Tree = {
mkIsInstanceOf(value, tpe, false/*global.phase.erasedTypes*/) // buraq: ignore which phase it is
}
/** Builds a cast with given value and type. */
def mkAsInstanceOf(value: Tree, tpe: Type, erased: Boolean): Tree = {
val sym =
if (erased) definitions.Any_asInstanceOfErased
else definitions.Any_asInstanceOf
Apply(
TypeApply(
mkAttributedSelect(value, sym),
List(TypeTree(tpe))),
List())
}
def mkAsInstanceOf(value: Tree, tpe: Type): Tree =
mkAsInstanceOf(value, tpe, global.phase.erasedTypes)
/** Builds a list with given head and tail. */
def mkNewCons(head: Tree, tail: Tree): Tree =
New(Apply(mkAttributedRef(definitions.ConsClass), List(head, tail)))
/** Builds a list with given head and tail. */
def mkNil: Tree =
mkAttributedRef(definitions.NilModule)
/** Builds a pair */
def mkNewPair(left: Tree, right: Tree) =
New(Apply(mkAttributedRef(definitions.TupleClass(2)), List(left, right)))
def mkCached(cvar: Symbol, expr: Tree): Tree = {
val cvarRef = if (cvar.owner.isClass) Select(This(cvar.owner), cvar) else Ident(cvar)
Block(
List(
If(Apply(Select(cvarRef, nme.eq), List(Literal(Constant(null)))),
Assign(cvarRef, expr),
EmptyTree)),
cvarRef
)
}
// var m$: T = null; or, if class member: local var m$: T = _;
def mkModuleVarDef(accessor: Symbol) = {
val mvar = accessor.owner.newVariable(accessor.pos, nme.moduleVarName(accessor.name))
.setInfo(accessor.tpe.finalResultType)
.setFlag(MODULEVAR);
if (mvar.owner.isClass) {
mvar setFlag (PRIVATE | LOCAL | SYNTHETIC);
mvar.owner.info.decls.enter(mvar);
}
ValDef(mvar, if (mvar.owner.isClass) EmptyTree else Literal(Constant(null)))
}
// def m: T = { if (m$ == null) m$ = new m$class; m$ }
def mkModuleAccessDef(accessor: Symbol, mvar: Symbol) =
DefDef(accessor, vparamss =>
mkCached(mvar,
New(TypeTree(mvar.tpe),
List(for (val pt <- mvar.tpe.symbol.primaryConstructor.info.paramTypes)
yield This(accessor.owner.enclClass)))))
// def m: T;
def mkModuleAccessDcl(accessor: Symbol) =
DefDef(accessor setFlag lateDEFERRED, vparamss => EmptyTree)
def mkRuntimeCall(meth: Name, args: List[Tree]): Tree =
Apply(Select(mkAttributedRef(ScalaRunTimeModule), meth), args)
}
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