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/* NSC -- new scala compiler
* Copyright 2005 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.symtab.classfile;
import java.io._;
import java.lang.{Float, Double}
import scala.collection.mutable.HashMap;
import scala.tools.nsc.util.Position;
import Flags._;
import PickleFormat._;
/**
* Serialize a top-level module and/or class;
* @see EntryTags.scala for symbol table attribute format.
*/
abstract class Pickler extends SubComponent {
import global._;
val phaseName = "pickler";
def newPhase(prev: Phase): StdPhase = new PicklePhase(prev);
class PicklePhase(prev: Phase) extends StdPhase(prev) {
def apply(unit: CompilationUnit): unit = {
def pickle(tree: Tree): unit = {
def add(sym: Symbol, pickle: Pickle) = {
if (currentRun.compiles(sym) && !currentRun.symData.contains(sym)) {
if (settings.debug.value) log("pickling " + sym);
pickle.putSymbol(sym);
currentRun.symData(sym) = pickle;
}
}
tree match {
case PackageDef(_, stats) => stats foreach pickle;
case ClassDef(_, _, _, _, _) | ModuleDef(_, _, _) =>
val sym = tree.symbol;
val pickle = new Pickle(sym.name.toTermName, sym.owner);
add(sym, pickle);
add(sym.linkedSym, pickle);
pickle.finish
case _ =>
}
}
pickle(unit.body);
}
}
class Pickle(rootName: Name, rootOwner: Symbol) extends PickleBuffer(new Array[byte](4096), -1, 0) {
private var entries = new Array[AnyRef](256);
private var ep = 0;
private val index = new HashMap[AnyRef, int];
/** Is root in symbol.owner*? */
private def isLocal(sym: Symbol): boolean = (
sym.isRefinementClass ||
sym.name.toTermName == rootName && sym.owner == rootOwner ||
sym != NoSymbol && isLocal(sym.owner)
);
// Phase 1 methods: Populate entries/index ------------------------------------
/** Store entry `e' in index at next available position unless it it
* already there. Return true iff entry is new. */
private def putEntry(entry: AnyRef): boolean = index.get(entry) match {
case Some(_) => false
case None =>
if (ep == entries.length) {
val entries1 = new Array[AnyRef](ep * 2);
System.arraycopy(entries, 0, entries1, 0, ep);
entries = entries1;
}
entries(ep) = entry;
index(entry) = ep;
ep = ep + 1;
true
}
/** Store symbol in index. If symbol is local, also store everything it refers to. */
def putSymbol(sym: Symbol): unit = if (putEntry(sym)) {
if (isLocal(sym)) {
putEntry(sym.name);
putSymbol(sym.owner);
putSymbol(sym.privateWithin);
putType(sym.info);
if (sym.thisSym != sym)
putType(sym.typeOfThis);
putSymbol(sym.alias);
//for (val attr <- sym.attributes) putAttribute(sym, attr);
} else if (sym != NoSymbol) {
putEntry(if (sym.isModuleClass) sym.name.toTermName else sym.name);
if (!sym.owner.isRoot) putSymbol(sym.owner);
}
}
private def putSymbols(syms: List[Symbol]) = syms foreach putSymbol;
/** Store type and everythig it refers to in index. */
private def putType(tp: Type): unit = if (putEntry(tp)) {
tp match {
case NoType | NoPrefix =>
;
case ThisType(sym) =>
putSymbol(sym)
case SingleType(pre, sym) =>
putType(pre); putSymbol(sym)
case ConstantType(value) =>
putConstant(value)
case TypeRef(pre, sym, args) =>
putType(pre); putSymbol(sym); putTypes(args)
case TypeBounds(lo, hi) =>
putType(lo); putType(hi);
case RefinedType(parents, decls) =>
putSymbol(tp.symbol); putTypes(parents); putSymbols(decls.toList)
case ClassInfoType(parents, decls, clazz) =>
putSymbol(clazz); putTypes(parents); putSymbols(decls.toList)
case MethodType(formals, restpe) =>
putType(restpe); putTypes(formals)
case PolyType(tparams, restpe) =>
putType(restpe); putSymbols(tparams)
case _ =>
throw new FatalError("bad type: " + tp + "(" + tp.getClass() + ")")
}
}
private def putTypes(tps: List[Type]): unit = tps foreach putType;
private def putConstant(c: Constant) =
if (putEntry(c)) {
if (c.tag == StringTag) putEntry(newTermName(c.stringValue))
else if (c.tag == ClassTag) putEntry(c.typeValue)
}
/*
private def putAttribute(attr: AttrInfo): unit = if (putEntry(attr)) {
putType(attr._1);
for (val c <- attr._2) putConstant(c);
}
*/
// Phase 2 methods: Write all entries to byte array ------------------------------
private val buf = new PickleBuffer(new Array[byte](4096), -1, 0);
/** Write a reference to object, i.e., the object's number in the index. */
private def writeRef(ref: AnyRef): unit = writeNat(index(ref));
private def writeRefs(refs: List[AnyRef]): unit = refs foreach writeRef;
/** Write name, owner, flags, and info of a symbol */
private def writeSymInfo(sym: Symbol): int = {
var posOffset = 0;
if (sym.pos != Position.NOPOS && sym.owner.isClass) {
writeNat(sym.pos);
posOffset = PosOffset
}
writeRef(sym.name);
writeRef(sym.owner);
writeNat((sym.flags & PickledFlags).asInstanceOf[int]);
if (sym.privateWithin != NoSymbol) writeRef(sym.privateWithin);
writeRef(sym.info);
posOffset
}
/** Write a name in Utf8 format. */
def writeName(name: Name): unit = {
ensureCapacity(name.length * 3);
writeIndex = name.copyUTF8(bytes, writeIndex);
}
/** Write an entry */
private def writeEntry(entry: AnyRef): unit = {
def writeBody: int = entry match {
case name: Name =>
writeName(name);
if (name.isTermName) TERMname else TYPEname
case NoSymbol =>
NONEsym
case sym: Symbol if !isLocal(sym) =>
val tag =
if (sym.isModuleClass) {
writeRef(sym.name.toTermName); EXTMODCLASSref
} else {
writeRef(sym.name); EXTref
}
if (!sym.owner.isRoot) writeRef(sym.owner);
tag
case sym: ClassSymbol =>
val posOffset = writeSymInfo(sym);
if (sym.thisSym != sym) writeRef(sym.typeOfThis);
CLASSsym + posOffset;
case sym: TypeSymbol =>
val posOffset = writeSymInfo(sym);
(if (sym.isAbstractType) TYPEsym else ALIASsym) + posOffset
case sym: TermSymbol =>
val posOffset = writeSymInfo(sym);
if (sym.alias != NoSymbol) writeRef(sym.alias);
(if (sym.isModule) MODULEsym else VALsym) + posOffset
case NoType =>
NOtpe
case NoPrefix =>
NOPREFIXtpe
case ThisType(sym) =>
writeRef(sym); THIStpe
case SingleType(pre, sym) =>
writeRef(pre); writeRef(sym); SINGLEtpe
case ConstantType(value) =>
writeRef(value);
CONSTANTtpe
case TypeRef(pre, sym, args) =>
writeRef(pre); writeRef(sym); writeRefs(args); TYPEREFtpe
case TypeBounds(lo, hi) =>
writeRef(lo); writeRef(hi); TYPEBOUNDStpe
case tp @ RefinedType(parents, decls) =>
writeRef(tp.symbol); writeRefs(parents); REFINEDtpe
case ClassInfoType(parents, decls, clazz) =>
writeRef(clazz); writeRefs(parents); CLASSINFOtpe
case MethodType(formals, restpe) =>
writeRef(restpe); writeRefs(formals);
if (entry.isInstanceOf[ImplicitMethodType]) IMPLICITMETHODtpe
else METHODtpe
case PolyType(tparams, restpe) =>
writeRef(restpe); writeRefs(tparams); POLYtpe
case c @ Constant(_) =>
if (c.tag == BooleanTag) writeLong(if (c.booleanValue) 1 else 0)
else if (ByteTag <= c.tag && c.tag <= LongTag) writeLong(c.longValue)
else if (c.tag == FloatTag) writeLong(Float.floatToIntBits(c.floatValue))
else if (c.tag == DoubleTag) writeLong(Double.doubleToLongBits(c.doubleValue));
else if (c.tag == StringTag) writeRef(newTermName(c.stringValue));
else if (c.tag == ClassTag) writeRef(c.typeValue);
LITERAL + c.tag
/*
case Pair(tp, cs) =>
writeRef(tp);
for (val c <- cs) writeRef(cs);
ATTRIBUTE
*/
case _ =>
throw new FatalError("bad entry: " + entry + " " + entry.getClass());//debug
}
val startpos = writeIndex;
writeByte(0); writeByte(0);
patchNat(startpos, writeBody);
patchNat(startpos + 1, writeIndex - (startpos + 2));
}
/** Write byte array */
def finish = {
assert(writeIndex == 0);
writeNat(MajorVersion);
writeNat(MinorVersion);
writeNat(ep);
if (settings.debug.value) log("" + ep + " entries");//debug
for (val i <- 0 until ep) writeEntry(entries(i));
}
override def toString() = "" + rootName + " in " + rootOwner;
}
}
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