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/* NSC -- new scala compiler
* Copyright 2005 LAMP/EPFL
* @author
*/
// $Id$
package scala.tools.nsc.transform;
import symtab._;
import Flags._;
import util.TreeSet;
import symtab.Flags._;
import scala.collection.immutable.ListMap;
import scala.collection.mutable.{HashMap, ListBuffer};
import scala.tools.nsc.util.FreshNameCreator;
abstract class Codify extends Transform {
import global._; // the global environment
import definitions._; // standard classes and methods
import typer.{typed, atOwner}; // methods to type trees
import posAssigner.atPos; // for filling in tree positions
/** the following two members override abstract members in Transform */
val phaseName: String = "codify";
def newTransformer(unit: CompilationUnit): Transformer = new AddRefFields(unit);
class AddRefFields(unit: CompilationUnit) extends Transformer {
override def transform(tree: Tree): Tree = tree match {
case Apply(TypeApply(Select(x@Ident(_), nme.lift_), _), List(tree)) if x.symbol == CodeModule =>
typed(atPos(tree.pos)(codify(tree)))
case _ =>
super.transform(tree)
}
}
case class FreeValue(tree: Tree) extends reflect.Tree;
class ReifyEnvironment extends HashMap[Symbol, reflect.Symbol] {
var targets = new HashMap[String, Option[reflect.LabelSymbol]]()
def addTarget(name: String, target: reflect.LabelSymbol): Unit =
targets.update(name, Some(target))
def getTarget(name: String): Option[reflect.LabelSymbol] =
targets.get(name) match {
case None =>
targets.update(name, None)
None
case Some(None) => None
case Some(tgt) => tgt
}
def hasAllTargets: Boolean =
targets.elements.map(._2).forall {
case Some(_) => true
case None => false
}
override def update(sym: Symbol, rsym: reflect.Symbol) =
super.update(sym,rsym)
}
class Reifier(env: ReifyEnvironment, currentOwner: reflect.Symbol) {
def reify(tree: Tree): reflect.Tree = tree match {
case Ident(_) =>
val rsym = reify(tree.symbol);
if (rsym == reflect.NoSymbol) FreeValue(tree)
else reflect.Ident(rsym)
case Select(qual, _) =>
val rsym = reify(tree.symbol);
if (rsym == reflect.NoSymbol) throw new TypeError("cannot reify symbol: " + tree.symbol)
else reflect.Select(reify(qual), reify(tree.symbol))
case Literal(constant) =>
reflect.Literal(constant.value)
case Apply(name, args) if name.toString().startsWith("label$") =>
env.getTarget(name.toString()) match {
case None => throw new TypeError("cannot reify tree (no forward jumps allowed): " + tree)
case Some(label) => reflect.Goto(label)
}
case Apply(fun, args) =>
reflect.Apply(reify(fun), args map reify)
case TypeApply(fun, args) =>
reflect.TypeApply(reify(fun), args map (.tpe) map reify)
case Function(vparams, body) =>
var env1 = env;
for (val vparam <- vparams) {
val local = reflect.LocalValue(
currentOwner, vparam.symbol.name.toString(), reify(vparam.symbol.tpe));
env1.update(vparam.symbol, local);
}
reflect.Function(vparams map (.symbol) map env1,
new Reifier(env1, currentOwner).reify(body))
case This(_) =>
reflect.This(reify(tree.symbol))
case Block(stats, expr) =>
reflect.Block(stats.map(reify), reify(expr))
case New(clazz) =>
val reifiedClass = reify(clazz)
reflect.New(reifiedClass)
case Typed(t, _) => reify(t)
case If(cond, thenp, elsep) => reflect.If(reify(cond), reify(thenp), reify(elsep))
case Assign(lhs, rhs) => reflect.Assign(reify(lhs), reify(rhs))
case LabelDef(name, Nil, body) =>
val sym = new reflect.LabelSymbol(name.toString())
env.addTarget(name.toString(), sym)
val res = reflect.Target(sym, reify(body))
res
case _ =>
throw new TypeError("cannot reify tree: " + tree)
}
private def mkGlobalSymbol(fullname: String, sym: Symbol): reflect.Symbol =
if (sym.isClass) reflect.Class(fullname)
else if (sym.isType) reflect.TypeField(fullname, reify(sym.info))
else if (sym.isMethod) reflect.Method(fullname, reify(sym.info))
else reflect.Field(fullname, reify(sym.info));
def reify(sym: Symbol): reflect.Symbol = env.get(sym) match {
case Some(rsym) =>
rsym
case None =>
if (sym.isRoot || sym.isRootPackage || sym.isEmptyPackageClass || sym.isEmptyPackage)
reflect.RootSymbol
else if (sym.owner.isTerm)
reflect.NoSymbol
else reify(sym.owner) match {
case reflect.NoSymbol =>
reflect.NoSymbol;
case reflect.RootSymbol =>
mkGlobalSymbol(sym.name.toString(), sym)
case reflect.Class(ownername) =>
mkGlobalSymbol(ownername + "." + sym.name, sym)
case _ =>
reflect.NoSymbol
}
}
def reify(tp: Type): reflect.Type = null
}
type InjectEnvironment = ListMap[reflect.Symbol, Name];
class Injector(env: InjectEnvironment, fresh: FreshNameCreator) {
// todo replace className by caseName in CaseClass once we have switched to nsc.
def className(value: CaseClass): String = value match {
case _ :: _ => "scala.$colon$colon"
case reflect.Ident(_) => "scala.reflect.Ident"
case reflect.Select(_, _) => "scala.reflect.Select"
case reflect.Literal(_) => "scala.reflect.Literal"
case reflect.Apply(_, _) => "scala.reflect.Apply"
case reflect.TypeApply(_, _) => "scala.reflect.TypeApply"
case reflect.Function(_, _) => "scala.reflect.Function"
case reflect.Class(_) => "scala.reflect.Class"
case reflect.Method(_, _) => "scala.reflect.Method"
case reflect.Field(_, _) => "scala.reflect.Field"
case reflect.TypeField(_, _) => "scala.reflect.TypeField"
case reflect.LocalValue(_, _, _) => "scala.reflect.LocalValue"
case reflect.LocalMethod(_, _, _) => "scala.reflect.LocalMethod"
case reflect.LabelSymbol(_) => "scala.reflect.LabelSymbol"
case reflect.This(_) => "scala.reflect.This"
case reflect.Block(_,_) => "scala.reflect.Block"
case reflect.New(_) => "scala.reflect.New"
case reflect.If(_,_,_) => "scala.reflect.If"
case reflect.Assign(_,_) => "scala.reflect.Assign"
case reflect.Target(_,_) => "scala.reflect.Target"
case reflect.Goto(_) => "scala.reflect.Goto"
case reflect.NamedType(_) => "scala.reflect.NamedType"
case reflect.PrefixedType(_, _) => "scala.reflect.PrefixedType"
case reflect.SingleType(_, _) => "scala.reflect.SingleType"
case reflect.ThisType(_) => "scala.reflect.ThisType"
case reflect.AppliedType(_, _) => "scala.reflect.AppliedType"
case reflect.TypeBounds(_, _) => "scala.reflect.TypeBounds"
case reflect.MethodType(_, _) =>
if (value.isInstanceOf[reflect.ImplicitMethodType]) "scala.reflect.ImplicitMethodType" else "scala.reflect.MethodType"
case reflect.PolyType(_, _, _) => "scala.reflect.PolyType"
case _ =>
""
}
def objectName(value: Any): String = value match {
case Nil => "scala.Nil"
case reflect.NoSymbol => "scala.reflect.NoSymbol"
case reflect.RootSymbol => "scala.reflect.RootSymbol"
case reflect.NoPrefix => "scala.reflect.NoPrefix"
case reflect.NoType => "scala.reflect.NoType"
case _ => ""
}
def inject(value: Any): Tree = value match {
case FreeValue(tree) =>
New(Ident(definitions.getClass("scala.reflect.Literal")), List(List(tree)))
case () => Literal(Constant(()))
case x: String => Literal(Constant(x))
case x: Boolean => Literal(Constant(x))
case x: Byte => Literal(Constant(x))
case x: Short => Literal(Constant(x))
case x: Char => Literal(Constant(x))
case x: Int => Literal(Constant(x))
case x: Long => Literal(Constant(x))
case x: Float => Literal(Constant(x))
case x: Double => Literal(Constant(x))
case c: CaseClass =>
val name = objectName(c);
if (name.length() != 0) gen.mkRef(definitions.getModule(name))
else {
val name = className(c);
if (name.length() == 0) throw new Error("don't know how to inject " + value);
val injectedArgs = new ListBuffer[Tree];
for (val i <- Iterator.range(0, c.caseArity))
injectedArgs += inject(c.caseElement(i));
New(Ident(definitions.getClass(name)), List(injectedArgs.toList))
}
case null => gen.mkRef(definitions.getModule("scala.reflect.NoType"))
case _ => throw new Error("don't know how to inject " + value);
}
}
def reify(tree: Tree): reflect.Tree =
new Reifier(new ReifyEnvironment(), reflect.NoSymbol).reify(tree);
def inject(code: reflect.Tree): Tree =
new Injector(ListMap.Empty, new FreshNameCreator).inject(code);
def codify (tree: Tree): Tree =
New(TypeTree(appliedType(definitions.CodeClass.typeConstructor, List(tree.tpe))),List(List(inject(reify(tree)))))
}
// case EmptyTree =>
// case LiftPoint(tree) =>
// case PackageDef(name, stats) =>
// case ClassDef(mods, name, tparams, tpt, impl) =>
// case ValDef(mods, name, tpt, rhs) =>
// case DefDef(mods, name, tparams, vparamss, tpt, rhs) =>
// case AbsTypeDef(mods, name, lo, hi) =>
// case AliasTypeDef(mods, name, tparams, rhs) =>
// case LabelDef(name, params, rhs) =>
// case Template(parents, body) =>
// case Block(stats, expr) =>
// case ArrayValue(elemtpt, trees) =>
// case Assign(lhs, rhs) =>
// case If(cond, thenp, elsep) =>
// case Match(selector, cases) =>
// case Return(expr) =>
// case Try(block, catches, finalizer) =>
// case Throw(expr) =>
// case New(tpt) =>
// case Typed(expr, tpt) =>
// case TypeApply(fun, args) =>
// case Apply(fun, args) =>
// case Super(qual, mix) =>
// case This(qual) =>
// case Select(qualifier, selector) =>
// case Ident(name) =>
// case Literal(value) =>
// case TypeTree() =>
// /* Pattern matching */
// case CaseDef(pat, guard, body) =>
// case Sequence(trees) =>
// case Alternative(trees) =>
// case Star(elem) =>
// case Bind(name, body) =>
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