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Scala example source code file (GenJVM.scala)
The Scala GenJVM.scala source code/* NSC -- new Scala compiler * Copyright 2005-2011 LAMP/EPFL * @author Iulian Dragos */ package scala.tools.nsc package backend.jvm import java.io.{ DataOutputStream, OutputStream } import java.nio.ByteBuffer import scala.collection.{ mutable, immutable } import scala.reflect.generic.{ PickleFormat, PickleBuffer } import scala.tools.reflect.SigParser import scala.tools.nsc.io.{ AbstractFile, Path } import scala.tools.nsc.util.ScalaClassLoader import scala.tools.nsc.symtab._ import scala.tools.nsc.symtab.classfile.ClassfileConstants._ import ch.epfl.lamp.fjbg._ import JAccessFlags._ import JObjectType.{ JAVA_LANG_STRING, JAVA_LANG_OBJECT } import java.util.jar.{ JarEntry, JarOutputStream } /** This class ... * * @author Iulian Dragos * @version 1.0 * */ abstract class GenJVM extends SubComponent with GenJVMUtil with GenAndroid with BytecodeWriters { import global._ import icodes._ import icodes.opcodes._ import definitions.{ NullClass, RuntimeNullClass, NothingClass, RuntimeNothingClass, AnyClass, ObjectClass, ThrowsClass, ThrowableClass, ClassfileAnnotationClass, SerializableClass, StringClass, ClassClass, FunctionClass, DeprecatedAttr, SerializableAttr, SerialVersionUIDAttr, VolatileAttr, TransientAttr, CloneableAttr, RemoteAttr } val phaseName = "jvm" /** Create a new phase */ override def newPhase(p: Phase): Phase = new JvmPhase(p) private def outputDirectory(sym: Symbol): AbstractFile = ( settings.outputDirs.outputDirFor { atPhase(currentRun.flattenPhase.prev)(sym.sourceFile) } ) private def getFile(base: AbstractFile, cls: JClass, suffix: String): AbstractFile = { var dir = base val pathParts = cls.getName().split("[./]").toList for (part <- pathParts.init) { dir = dir.subdirectoryNamed(part) } dir.fileNamed(pathParts.last + suffix) } private def getFile(sym: Symbol, cls: JClass, suffix: String): AbstractFile = getFile(outputDirectory(sym), cls, suffix) /** JVM code generation phase */ class JvmPhase(prev: Phase) extends ICodePhase(prev) { def name = phaseName override def erasedTypes = true def apply(cls: IClass) = sys.error("no implementation") override def run() { // we reinstantiate the bytecode generator at each run, to allow the GC // to collect everything if (settings.debug.value) inform("[running phase " + name + " on icode]") if (settings.Xdce.value) for ((sym, cls) <- icodes.classes if inliner.isClosureClass(sym) && !deadCode.liveClosures(sym)) icodes.classes -= sym val bytecodeWriter = settings.outputDirs.getSingleOutput match { case Some(f) if f hasExtension "jar" => new DirectToJarfileWriter(f) case _ => if (settings.Ygenjavap.isDefault) new ClassBytecodeWriter { } else new ClassBytecodeWriter with JavapBytecodeWriter { } } val codeGenerator = new BytecodeGenerator(bytecodeWriter) classes.values foreach (codeGenerator genClass _) bytecodeWriter.close() classes.clear() } } /** Return the suffix of a class name */ def moduleSuffix(sym: Symbol) = if (sym.hasModuleFlag && !sym.isMethod && !sym.isImplClass && !sym.isJavaDefined) "$" else "" var pickledBytes = 0 // statistics /** * Java bytecode generator. * */ class BytecodeGenerator(bytecodeWriter: BytecodeWriter) extends BytecodeUtil { def this() = this(new ClassBytecodeWriter { }) def debugLevel = settings.debuginfo.indexOfChoice import bytecodeWriter.writeClass val MIN_SWITCH_DENSITY = 0.7 val INNER_CLASSES_FLAGS = (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL | ACC_INTERFACE | ACC_ABSTRACT) val PublicStatic = ACC_PUBLIC | ACC_STATIC val PublicStaticFinal = ACC_PUBLIC | ACC_STATIC | ACC_FINAL val StringBuilderClassName = definitions.StringBuilderClass.fullName val BoxesRunTime = "scala.runtime.BoxesRunTime" val StringBuilderType = new JObjectType(StringBuilderClassName) val toStringType = new JMethodType(JAVA_LANG_STRING, JType.EMPTY_ARRAY) val arrayCloneType = new JMethodType(JAVA_LANG_OBJECT, JType.EMPTY_ARRAY) val MethodTypeType = new JObjectType("java.dyn.MethodType") val JavaLangClassType = new JObjectType("java.lang.Class") val MethodHandleType = new JObjectType("java.dyn.MethodHandle") // Scala attributes val BeanInfoAttr = definitions.getClass("scala.reflect.BeanInfo") val BeanInfoSkipAttr = definitions.getClass("scala.reflect.BeanInfoSkip") val BeanDisplayNameAttr = definitions.getClass("scala.reflect.BeanDisplayName") val BeanDescriptionAttr = definitions.getClass("scala.reflect.BeanDescription") lazy val CloneableClass = definitions.getClass("java.lang.Cloneable") lazy val RemoteInterface = definitions.getClass("java.rmi.Remote") lazy val RemoteException = definitions.getClass("java.rmi.RemoteException").tpe val versionPickle = { val vp = new PickleBuffer(new Array[Byte](16), -1, 0) assert(vp.writeIndex == 0) vp writeNat PickleFormat.MajorVersion vp writeNat PickleFormat.MinorVersion vp writeNat 0 vp } var clasz: IClass = _ var method: IMethod = _ var jclass: JClass = _ var jmethod: JMethod = _ // var jcode: JExtendedCode = _ val fjbgContext = new FJBGContext(49, 0) val emitSource = debugLevel >= 1 val emitLines = debugLevel >= 2 val emitVars = debugLevel >= 3 override def javaName(sym: Symbol): String = { if (sym.isClass && !sym.rawowner.isPackageClass && !sym.isModuleClass) innerClassBuffer += sym super.javaName(sym) } /** Write a class to disk, adding the Scala signature (pickled type * information) and inner classes. * * @param jclass The FJBG class, where code was emitted * @param sym The corresponding symbol, used for looking up pickled information */ def emitClass(jclass: JClass, sym: Symbol) { addInnerClasses(jclass) writeClass("" + sym.name, jclass, sym) } /** Returns the ScalaSignature annotation if it must be added to this class, * none otherwise; furthermore, it adds to `jclass` the ScalaSig marker * attribute (marking that a scala signature annotation is present) or the * Scala marker attribute (marking that the signature for this class is in * another file). The annotation that is returned by this method must be * added to the class' annotations list when generating them. * * @param jclass The class file that is being readied. * @param sym The symbol for which the signature has been entered in * the symData map. This is different than the symbol * that is being generated in the case of a mirror class. * @return An option that is: * - defined and contains an annotation info of the * ScalaSignature type, instantiated with the pickle * signature for sym (a ScalaSig marker attribute has * been written); * - undefined if the jclass/sym couple must not contain a * signature (a Scala marker attribute has been written). */ def scalaSignatureAddingMarker(jclass: JClass, sym: Symbol): Option[AnnotationInfo] = currentRun.symData get sym match { case Some(pickle) if !jclass.getName().endsWith("$") => val scalaAttr = fjbgContext.JOtherAttribute(jclass, jclass, tpnme.ScalaSignatureATTR.toString, versionPickle.bytes, versionPickle.writeIndex) jclass addAttribute scalaAttr val scalaAnnot = { val sigBytes = ScalaSigBytes(pickle.bytes.take(pickle.writeIndex)) AnnotationInfo(sigBytes.sigAnnot, Nil, List((nme.bytes, sigBytes))) } pickledBytes += pickle.writeIndex currentRun.symData -= sym currentRun.symData -= sym.companionSymbol Some(scalaAnnot) case _ => val markerAttr = fjbgContext.JOtherAttribute(jclass, jclass, tpnme.ScalaATTR.toString, new Array[Byte](0), 0) jclass addAttribute markerAttr None } var serialVUID: Option[Long] = None var isRemoteClass: Boolean = false var isParcelableClass = false private val innerClassBuffer = new mutable.ListBuffer[Symbol] def genClass(c: IClass) { clasz = c innerClassBuffer.clear() var parents = c.symbol.info.parents var ifaces = JClass.NO_INTERFACES val name = javaName(c.symbol) serialVUID = None isRemoteClass = false isParcelableClass = isAndroidParcelableClass(c.symbol) if (parents.isEmpty) parents = List(ObjectClass.tpe) for (annot <- c.symbol.annotations) annot match { case AnnotationInfo(tp, _, _) if tp.typeSymbol == SerializableAttr => parents :+= SerializableClass.tpe case AnnotationInfo(tp, _, _) if tp.typeSymbol == CloneableAttr => parents :+= CloneableClass.tpe case AnnotationInfo(tp, Literal(const) :: _, _) if tp.typeSymbol == SerialVersionUIDAttr => serialVUID = Some(const.longValue) case AnnotationInfo(tp, _, _) if tp.typeSymbol == RemoteAttr => parents :+= RemoteInterface.tpe isRemoteClass = true case _ => } parents = parents.distinct if (parents.tail.nonEmpty) ifaces = mkArray(parents drop 1 map (x => javaName(x.typeSymbol))) jclass = fjbgContext.JClass(javaFlags(c.symbol), name, javaName(parents(0).typeSymbol), ifaces, c.cunit.source.toString) if (isStaticModule(c.symbol) || serialVUID != None || isParcelableClass || clasz.bootstrapClass.isDefined) { if (isStaticModule(c.symbol)) addModuleInstanceField addStaticInit(jclass, c.lookupStaticCtor) if (isTopLevelModule(c.symbol)) { if (c.symbol.companionClass == NoSymbol) dumpMirrorClass(c.symbol, c.cunit.source.toString) else log("No mirror class for module with linked class: " + c.symbol.fullName) } } else { c.lookupStaticCtor foreach (constructor => addStaticInit(jclass, Some(constructor))) // it must be a top level class (name contains no $s) def isCandidateForForwarders(sym: Symbol): Boolean = atPhase(currentRun.picklerPhase.next) { !(sym.name.toString contains '$') && sym.hasModuleFlag && !sym.isImplClass && !sym.isNestedClass } // At some point this started throwing lots of exceptions as a compile was finishing. // error: java.lang.AssertionError: // assertion failed: List(object package$CompositeThrowable, object package$CompositeThrowable) // ...is the one I've seen repeatedly. Suppressing. val lmoc = ( try c.symbol.companionModule catch { case x: AssertionError => Console.println("Suppressing failed assert: " + x) NoSymbol } ) // add static forwarders if there are no name conflicts; see bugs #363 and #1735 if (lmoc != NoSymbol && !c.symbol.isInterface) { if (isCandidateForForwarders(lmoc) && !settings.noForwarders.value) { log("Adding static forwarders from '%s' to implementations in '%s'".format(c.symbol, lmoc)) addForwarders(jclass, lmoc.moduleClass) } } } if (clasz.bootstrapClass.isDefined) jclass setBootstrapClass clasz.bootstrapClass.get clasz.fields foreach genField clasz.methods foreach genMethod val ssa = scalaSignatureAddingMarker(jclass, c.symbol) addGenericSignature(jclass, c.symbol, c.symbol.owner) addAnnotations(jclass, c.symbol.annotations ++ ssa) addEnclosingMethodAttribute(jclass, c.symbol) emitClass(jclass, c.symbol) if (c.symbol hasAnnotation BeanInfoAttr) genBeanInfoClass(c) } private def addEnclosingMethodAttribute(jclass: JClass, clazz: Symbol) { val sym = clazz.originalEnclosingMethod if (sym.isMethod) { log("enclosing method for %s is %s (in %s)".format(clazz, sym, sym.enclClass)) jclass addAttribute fjbgContext.JEnclosingMethodAttribute( jclass, javaName(sym.enclClass), javaName(sym), javaType(sym) ) } else if (clazz.isAnonymousClass) { val enclClass = clazz.rawowner assert(enclClass.isClass, "" + enclClass) val sym = enclClass.primaryConstructor if (sym == NoSymbol) log("Ran out of room looking for an enclosing method for %s: no constructor here.".format( enclClass, clazz) ) else { log("enclosing method for %s is %s (in %s)".format(clazz, sym, enclClass)) jclass addAttribute fjbgContext.JEnclosingMethodAttribute( jclass, javaName(enclClass), javaName(sym), javaType(sym).asInstanceOf[JMethodType] ) } } } /** * Generate a bean info class that describes the given class. * * @author Ross Judson (ross.judson@soletta.com) */ def genBeanInfoClass(c: IClass) { val description = c.symbol.annotations.find(_.atp.typeSymbol == BeanDescriptionAttr) // informProgress(description.toString) val beanInfoClass = fjbgContext.JClass(javaFlags(c.symbol), javaName(c.symbol) + "BeanInfo", "scala/reflect/ScalaBeanInfo", JClass.NO_INTERFACES, c.cunit.source.toString) var fieldList = List[String]() for (f <- clasz.fields if f.symbol.hasGetter; val g = f.symbol.getter(c.symbol); val s = f.symbol.setter(c.symbol); if g.isPublic && !(f.symbol.name startsWith "$")) // inserting $outer breaks the bean fieldList = javaName(f.symbol) :: javaName(g) :: (if (s != NoSymbol) javaName(s) else null) :: fieldList val methodList = for (m <- clasz.methods if !m.symbol.isConstructor && m.symbol.isPublic && !(m.symbol.name startsWith "$") && !m.symbol.isGetter && !m.symbol.isSetter) yield javaName(m.symbol) val constructor = beanInfoClass.addNewMethod(ACC_PUBLIC, "<init>", JType.VOID, new Array[JType](0), new Array[String](0)) val jcode = constructor.getCode().asInstanceOf[JExtendedCode] val strKind = new JObjectType(javaName(StringClass)) val stringArrayKind = new JArrayType(strKind) val conType = new JMethodType(JType.VOID, Array(javaType(ClassClass), stringArrayKind, stringArrayKind)) def push(lst:Seq[String]) { var fi = 0 for (f <- lst) { jcode.emitDUP() jcode emitPUSH fi if (f != null) jcode emitPUSH f else jcode.emitACONST_NULL() jcode emitASTORE strKind fi += 1 } } jcode.emitALOAD_0() // push the class jcode emitPUSH javaType(c.symbol).asInstanceOf[JReferenceType] // push the the string array of field information jcode emitPUSH fieldList.length jcode emitANEWARRAY strKind push(fieldList) // push the string array of method information jcode emitPUSH methodList.length jcode emitANEWARRAY strKind push(methodList) // invoke the superclass constructor, which will do the // necessary java reflection and create Method objects. jcode.emitINVOKESPECIAL("scala/reflect/ScalaBeanInfo", "<init>", conType) jcode.emitRETURN() // write the bean information class file. writeClass("BeanInfo ", beanInfoClass, c.symbol) } /** Add the given 'throws' attributes to jmethod */ def addExceptionsAttribute(jmethod: JMethod, excs: List[AnnotationInfo]) { if (excs.isEmpty) return val cpool = jmethod.getConstantPool val buf: ByteBuffer = ByteBuffer.allocate(512) var nattr = 0 // put some random value; the actual number is determined at the end buf putShort 0xbaba.toShort for (AnnotationInfo(tp, List(exc), _) <- excs.distinct if tp.typeSymbol == ThrowsClass) { val Literal(const) = exc buf.putShort( cpool.addClass( javaName(const.typeValue.typeSymbol)).shortValue) nattr += 1 } assert(nattr > 0) buf.putShort(0, nattr.toShort) addAttribute(jmethod, tpnme.ExceptionsATTR, buf) } /** Whether an annotation should be emitted as a Java annotation * .initialize: if 'annot' is read from pickle, atp might be un-initialized */ private def shouldEmitAnnotation(annot: AnnotationInfo) = annot.atp.typeSymbol.initialize.isJavaDefined && annot.atp.typeSymbol.isNonBottomSubClass(ClassfileAnnotationClass) && annot.args.isEmpty private def emitJavaAnnotations(cpool: JConstantPool, buf: ByteBuffer, annotations: List[AnnotationInfo]): Int = { def emitArgument(arg: ClassfileAnnotArg): Unit = arg match { case LiteralAnnotArg(const) => const.tag match { case BooleanTag => buf put 'Z'.toByte buf putShort cpool.addInteger(if(const.booleanValue) 1 else 0).toShort case ByteTag => buf put 'B'.toByte buf putShort cpool.addInteger(const.byteValue).toShort case ShortTag => buf put 'S'.toByte buf putShort cpool.addInteger(const.shortValue).toShort case CharTag => buf put 'C'.toByte buf putShort cpool.addInteger(const.charValue).toShort case IntTag => buf put 'I'.toByte buf putShort cpool.addInteger(const.intValue).toShort case LongTag => buf put 'J'.toByte buf putShort cpool.addLong(const.longValue).toShort case FloatTag => buf put 'F'.toByte buf putShort cpool.addFloat(const.floatValue).toShort case DoubleTag => buf put 'D'.toByte buf putShort cpool.addDouble(const.doubleValue).toShort case StringTag => buf put 's'.toByte buf putShort cpool.addUtf8(const.stringValue).toShort case ClassTag => buf put 'c'.toByte buf putShort cpool.addUtf8(javaType(const.typeValue).getSignature()).toShort case EnumTag => buf put 'e'.toByte buf putShort cpool.addUtf8(javaType(const.tpe).getSignature()).toShort buf putShort cpool.addUtf8(const.symbolValue.name.toString).toShort } case sb@ScalaSigBytes(bytes) if !sb.isLong => buf put 's'.toByte buf putShort cpool.addUtf8(sb.encodedBytes).toShort case sb@ScalaSigBytes(bytes) if sb.isLong => buf put '['.toByte val stringCount = (sb.encodedBytes.length / 65534) + 1 buf putShort stringCount.toShort for (i <- 0 until stringCount) { buf put 's'.toByte val j = i * 65535 val string = sb.encodedBytes.slice(j, j + 65535) buf putShort cpool.addUtf8(string).toShort } case ArrayAnnotArg(args) => buf put '['.toByte buf putShort args.length.toShort args foreach emitArgument case NestedAnnotArg(annInfo) => buf put '@'.toByte emitAnnotation(annInfo) } def emitAnnotation(annotInfo: AnnotationInfo) { val AnnotationInfo(typ, args, assocs) = annotInfo val jtype = javaType(typ) buf putShort cpool.addUtf8(jtype.getSignature()).toShort assert(args.isEmpty, args.toString) buf putShort assocs.length.toShort for ((name, value) <- assocs) { buf putShort cpool.addUtf8(name.toString).toShort emitArgument(value) } } var nannots = 0 val pos = buf.position() // put some random value; the actual number of annotations is determined at the end buf putShort 0xbaba.toShort for (annot <- annotations if shouldEmitAnnotation(annot)) { nannots += 1 emitAnnotation(annot) } // save the number of annotations buf.putShort(pos, nannots.toShort) nannots } /** Run the signature parser to catch bogus signatures. */ def isValidSignature(sym: Symbol, sig: String) = ( if (sym.isMethod) SigParser verifyMethod sig else if (sym.isTerm) SigParser verifyType sig else SigParser verifyClass sig ) // @M don't generate java generics sigs for (members of) implementation // classes, as they are monomorphic (TODO: ok?) private def needsGenericSignature(sym: Symbol) = !( // PP: This condition used to include sym.hasExpandedName, but this leads // to the total loss of generic information if a private member is // accessed from a closure: both the field and the accessor were generated // without it. This is particularly bad because the availability of // generic information could disappear as a consequence of a seemingly // unrelated change. sym.isSynthetic || sym.isLiftedMethod || sym.isBridge || (sym.ownerChain exists (_.isImplClass)) ) def addGenericSignature(jmember: JMember, sym: Symbol, owner: Symbol) { if (needsGenericSignature(sym)) { val memberTpe = atPhase(currentRun.erasurePhase)(owner.thisType.memberInfo(sym)) // println("addGenericSignature sym: " + sym.fullName + " : " + memberTpe + " sym.info: " + sym.info) // println("addGenericSignature: "+ (sym.ownerChain map (x => (x.name, x.isImplClass)))) erasure.javaSig(sym, memberTpe) foreach { sig => /** Since we're using a sun internal class for signature validation, * we have to allow for it not existing or otherwise malfunctioning: * in which case we treat every signature as valid. Medium term we * should certainly write independent signature validation. */ if (settings.Xverify.value && SigParser.isParserAvailable && !isValidSignature(sym, sig)) { clasz.cunit.warning(sym.pos, """|compiler bug: created invalid generic signature for %s in %s |signature: %s |if this is reproducible, please report bug at http://lampsvn.epfl.ch/trac/scala """.trim.stripMargin.format(sym, sym.owner.skipPackageObject.fullName, sig)) return } if ((settings.check.value contains "genjvm")) { val normalizedTpe = atPhase(currentRun.erasurePhase)(erasure.prepareSigMap(memberTpe)) val bytecodeTpe = owner.thisType.memberInfo(sym) if (!sym.isType && !sym.isConstructor && !(erasure.erasure(normalizedTpe) =:= bytecodeTpe)) { clasz.cunit.warning(sym.pos, """|compiler bug: created generic signature for %s in %s that does not conform to its erasure |signature: %s |original type: %s |normalized type: %s |erasure type: %s |if this is reproducible, please report bug at http://lampsvn.epfl.ch/trac/scala """.trim.stripMargin.format(sym, sym.owner.skipPackageObject.fullName, sig, memberTpe, normalizedTpe, bytecodeTpe)) return } } val index = jmember.getConstantPool.addUtf8(sig).toShort if (opt.verboseDebug) atPhase(currentRun.erasurePhase) { println("add generic sig "+sym+":"+sym.info+" ==> "+sig+" @ "+index) } val buf = ByteBuffer.allocate(2) buf putShort index addAttribute(jmember, tpnme.SignatureATTR, buf) } } } def addAnnotations(jmember: JMember, annotations: List[AnnotationInfo]) { if (annotations.exists(_.atp.typeSymbol == definitions.DeprecatedAttr)) { val attr = jmember.getContext().JOtherAttribute( jmember.getJClass(), jmember, tpnme.DeprecatedATTR.toString, new Array[Byte](0), 0) jmember addAttribute attr } val toEmit = annotations filter shouldEmitAnnotation if (toEmit.isEmpty) return val buf: ByteBuffer = ByteBuffer.allocate(2048) emitJavaAnnotations(jmember.getConstantPool, buf, toEmit) addAttribute(jmember, tpnme.RuntimeAnnotationATTR, buf) } def addParamAnnotations(jmethod: JMethod, pannotss: List[List[AnnotationInfo]]) { val annotations = pannotss map (_ filter shouldEmitAnnotation) if (annotations forall (_.isEmpty)) return val buf: ByteBuffer = ByteBuffer.allocate(2048) // number of parameters buf.put(annotations.length.toByte) for (annots <- annotations) emitJavaAnnotations(jmethod.getConstantPool, buf, annots) addAttribute(jmethod, tpnme.RuntimeParamAnnotationATTR, buf) } def addAttribute(jmember: JMember, name: Name, buf: ByteBuffer) { if (buf.position() < 2) return val length = buf.position() val arr = buf.array().slice(0, length) val attr = jmember.getContext().JOtherAttribute(jmember.getJClass(), jmember, name.toString, arr, length) jmember addAttribute attr } def addInnerClasses(jclass: JClass) { /** The outer name for this inner class. Note that it returns null * when the inner class should not get an index in the constant pool. * That means non-member classes (anonymous). See Section 4.7.5 in the JVMS. */ def outerName(innerSym: Symbol): String = { if (innerSym.originalEnclosingMethod != NoSymbol) null else { val outerName = javaName(innerSym.rawowner) if (isTopLevelModule(innerSym.rawowner)) outerName stripSuffix "$" else outerName } } def innerName(innerSym: Symbol): String = if (innerSym.isAnonymousClass || innerSym.isAnonymousFunction) null else innerSym.rawname.toString // add inner classes which might not have been referenced yet atPhase(currentRun.erasurePhase.next) { for (sym <- List(clasz.symbol, clasz.symbol.linkedClassOfClass) ; m <- sym.info.decls ; if m.isClass) innerClassBuffer += m } val allInners = innerClassBuffer.toList if (allInners.nonEmpty) { val innerClassesAttr = jclass.getInnerClasses() // sort them so inner classes succeed their enclosing class // to satisfy the Eclipse Java compiler //for (innerSym <- innerClasses.toList sortBy (_.name.length)) { for (innerSym <- allInners.distinct sortBy (_.name.length)) { var flags = javaFlags(innerSym) if (innerSym.rawowner.hasModuleFlag) flags |= ACC_STATIC innerClassesAttr.addEntry( javaName(innerSym), outerName(innerSym), innerName(innerSym), flags & INNER_CLASSES_FLAGS ) } } } def genField(f: IField) { if (settings.debug.value) log("Adding field: " + f.symbol.fullName) val attributes = f.symbol.annotations.map(_.atp.typeSymbol).foldLeft(0) { case (res, TransientAttr) => res | ACC_TRANSIENT case (res, VolatileAttr) => res | ACC_VOLATILE case (res, _) => res } var flags = javaFlags(f.symbol) if (!f.symbol.isMutable) flags |= ACC_FINAL val jfield = jclass.addNewField(flags | attributes, javaName(f.symbol), javaType(f.symbol.tpe)) addGenericSignature(jfield, f.symbol, clasz.symbol) addAnnotations(jfield, f.symbol.annotations) } def genMethod(m: IMethod) { if (m.symbol.isStaticConstructor) return if ((m.symbol.name == nme.getClass_) && m.params.isEmpty) return log("Generating method " + m.symbol.fullName) method = m endPC.clear computeLocalVarsIndex(m) var resTpe = javaType(m.symbol.tpe.resultType) if (m.symbol.isClassConstructor) resTpe = JType.VOID var flags = javaFlags(m.symbol) if (jclass.isInterface) flags |= ACC_ABSTRACT if (m.symbol.isStrictFP) flags |= ACC_STRICT // native methods of objects are generated in mirror classes if (method.native) flags |= ACC_NATIVE jmethod = jclass.addNewMethod(flags, javaName(m.symbol), resTpe, mkArray(m.params map (p => javaType(p.kind))), mkArray(m.params map (p => javaName(p.sym)))) addRemoteException(jmethod, m.symbol) if (!jmethod.isAbstract() && !method.native) { val jcode = jmethod.getCode().asInstanceOf[JExtendedCode] // add a fake local for debugging purposes if (emitVars && isClosureApply(method.symbol)) { val outerField = clasz.symbol.info.decl(nme.OUTER_LOCAL) if (outerField != NoSymbol) { log("Adding fake local to represent outer 'this' for closure " + clasz) val _this = new Local( method.symbol.newVariable(NoPosition, nme.FAKE_LOCAL_THIS), toTypeKind(outerField.tpe), false) m.locals = m.locals ::: List(_this) computeLocalVarsIndex(m) // since we added a new local, we need to recompute indexes jcode.emitALOAD_0() jcode.emitGETFIELD(javaName(clasz.symbol), javaName(outerField), javaType(outerField)) jcode.emitSTORE(indexOf(_this), javaType(_this.kind)) } } for (local <- m.locals if ! m.params.contains(local)) { if (settings.debug.value) log("add local var: " + local) jmethod.addNewLocalVariable(javaType(local.kind), javaName(local.sym)) } genCode(m) if (emitVars) genLocalVariableTable(m, jcode) } addGenericSignature(jmethod, m.symbol, clasz.symbol) val (excs, others) = splitAnnotations(m.symbol.annotations, ThrowsClass) addExceptionsAttribute(jmethod, excs) addAnnotations(jmethod, others) addParamAnnotations(jmethod, m.params.map(_.sym.annotations)) } private def addRemoteException(jmethod: JMethod, meth: Symbol) { def isRemoteThrows(ainfo: AnnotationInfo) = ainfo match { case AnnotationInfo(tp, List(arg), _) if tp.typeSymbol == ThrowsClass => arg match { case Literal(Constant(tpe: Type)) if tpe.typeSymbol == RemoteException.typeSymbol => true case _ => false } case _ => false } if (isRemoteClass || (meth.hasAnnotation(RemoteAttr) && jmethod.isPublic)) { val c = Constant(RemoteException) val ainfo = AnnotationInfo(ThrowsClass.tpe, List(Literal(c).setType(c.tpe)), List()) if (!meth.annotations.exists(isRemoteThrows)) { meth addAnnotation ainfo } } } /** Return a pair of lists of annotations, first one containing all * annotations for the given symbol, and the rest. */ private def splitAnnotations(annotations: List[AnnotationInfo], annotSym: Symbol): (List[AnnotationInfo], List[AnnotationInfo]) = { annotations.partition { a => a match { case AnnotationInfo(tp, _, _) if tp.typeSymbol == annotSym => true case _ => false }} } private def isClosureApply(sym: Symbol): Boolean = { (sym.name == nme.apply) && sym.owner.isSynthetic && sym.owner.tpe.parents.exists { t => val TypeRef(_, sym, _) = t FunctionClass contains sym } } def addModuleInstanceField() { jclass.addNewField(PublicStaticFinal, nme.MODULE_INSTANCE_FIELD.toString, jclass.getType()) } def addStaticInit(cls: JClass, mopt: Option[IMethod]) { val clinitMethod = cls.addNewMethod(PublicStatic, "<clinit>", JType.VOID, JType.EMPTY_ARRAY, new Array[String](0)) val clinit = clinitMethod.getCode().asInstanceOf[JExtendedCode] mopt match { case Some(m) => if (clasz.bootstrapClass.isDefined) legacyEmitBootstrapMethodInstall(clinit) val oldLastBlock = m.code.blocks.last val lastBlock = m.code.newBlock oldLastBlock.replaceInstruction(oldLastBlock.length - 1, JUMP(lastBlock)) if (isStaticModule(clasz.symbol)) { // call object's private ctor from static ctor lastBlock emit NEW(REFERENCE(m.symbol.enclClass)) lastBlock emit CALL_METHOD(m.symbol.enclClass.primaryConstructor, Static(true)) } // add serialVUID code serialVUID foreach { value => import Flags._, definitions._ val fieldName = "serialVersionUID" val fieldSymbol = clasz.symbol.newValue(NoPosition, newTermName(fieldName)) .setFlag(STATIC | FINAL) .setInfo(longType) clasz addField new IField(fieldSymbol) lastBlock emit CONSTANT(Constant(value)) lastBlock emit STORE_FIELD(fieldSymbol, true) } if (isParcelableClass) addCreatorCode(BytecodeGenerator.this, lastBlock) if (clasz.bootstrapClass.isDefined) { // emit bootstrap method install //emitBootstrapMethodInstall(block) } lastBlock emit RETURN(UNIT) lastBlock.close method = m jmethod = clinitMethod genCode(m) case None => legacyStaticInitializer(cls, clinit) } } private def legacyStaticInitializer(cls: JClass, clinit: JExtendedCode) { if (isStaticModule(clasz.symbol)) { clinit emitNEW cls.getName() clinit.emitINVOKESPECIAL(cls.getName(), JMethod.INSTANCE_CONSTRUCTOR_NAME, JMethodType.ARGLESS_VOID_FUNCTION) } serialVUID foreach { value => val fieldName = "serialVersionUID" jclass.addNewField(PublicStaticFinal, fieldName, JType.LONG) clinit emitPUSH value clinit.emitPUSH(value) clinit.emitPUTSTATIC(jclass.getName(), fieldName, JType.LONG) } if (isParcelableClass) legacyAddCreatorCode(BytecodeGenerator.this, clinit) if (clasz.bootstrapClass.isDefined) legacyEmitBootstrapMethodInstall(clinit) clinit.emitRETURN() } /** Emit code that installs a boostrap method for invoke dynamic. It * installs the default method, found in scala.runtime.DynamicDispatch. */ def legacyEmitBootstrapMethodInstall(jcode: JExtendedCode) { jcode emitPUSH jclass.getType.asInstanceOf[JReferenceType] jcode emitPUSH new JObjectType("scala.runtime.DynamicDispatch") jcode emitPUSH "bootstrapInvokeDynamic" jcode.emitGETSTATIC("java.dyn.Linkage", "BOOTSTRAP_METHOD_TYPE", MethodTypeType) jcode.emitDUP jcode.emitINVOKESTATIC("scala.Console", "println", new JMethodType(JType.VOID, Array(JAVA_LANG_OBJECT))) jcode.emitINVOKESTATIC("java.dyn.MethodHandles", "findStatic", new JMethodType(MethodHandleType, Array(JavaLangClassType, JAVA_LANG_STRING, MethodTypeType))) jcode.emitINVOKESTATIC("java.dyn.Linkage", "registerBootstrapMethod", new JMethodType(JType.VOID, Array(JavaLangClassType, MethodHandleType))) } /** Add a forwarder for method m */ def addForwarder(jclass: JClass, module: Symbol, m: Symbol, accessFlags: Int) { val moduleName = javaName(module) val methodInfo = module.thisType.memberInfo(m) val paramJavaTypes = methodInfo.paramTypes map javaType val paramNames = 0 until paramJavaTypes.length map ("x_" + _) val mirrorMethod = jclass.addNewMethod( accessFlags, javaName(m), javaType(methodInfo.resultType), mkArray(paramJavaTypes), mkArray(paramNames)) val mirrorCode = mirrorMethod.getCode().asInstanceOf[JExtendedCode] mirrorCode.emitGETSTATIC(moduleName, nme.MODULE_INSTANCE_FIELD.toString, new JObjectType(moduleName)) var i = 0 var index = 0 var argTypes = mirrorMethod.getArgumentTypes() while (i < argTypes.length) { mirrorCode.emitLOAD(index, argTypes(i)) index += argTypes(i).getSize() i += 1 } mirrorCode.emitINVOKEVIRTUAL(moduleName, mirrorMethod.getName, javaType(m).asInstanceOf[JMethodType]) mirrorCode emitRETURN mirrorMethod.getReturnType() addRemoteException(mirrorMethod, m) // only add generic signature if the method is concrete; bug #1745 if (!m.isDeferred) addGenericSignature(mirrorMethod, m, module) val (throws, others) = splitAnnotations(m.annotations, ThrowsClass) addExceptionsAttribute(mirrorMethod, throws) addAnnotations(mirrorMethod, others) addParamAnnotations(mirrorMethod, m.info.params.map(_.annotations)) } /** Add forwarders for all methods defined in `module' that don't conflict * with methods in the companion class of `module'. A conflict arises when * a method with the same name is defined both in a class and its companion * object: method signature is not taken into account. */ def addForwarders(jclass: JClass, moduleClass: Symbol) { assert(moduleClass.isModuleClass) if (settings.debug.value) log("Dumping mirror class for object: " + moduleClass) val className = jclass.getName val linkedClass = moduleClass.companionClass val linkedModule = linkedClass.companionSymbol /** If we use the usual algorithm for forwarders, we run into a problem if * an object extends its companion class. However, there is an out: since * all the forwarders are static, inheriting from the class is no problem * so long as the methods aren't final (the JVM will not allow redefinition * of a final static method.) Thus the following. */ val isIncestuous = moduleClass.tpe <:< linkedClass.tpe val accessFlags = if (isIncestuous) PublicStatic else PublicStaticFinal /** There was a bit of a gordian logic knot here regarding forwarders. * All we really have to do is exclude certain categories of symbols and * then all matching names. */ def memberNames(sym: Symbol) = sym.info.members map (_.name.toString) toSet lazy val membersInCommon = memberNames(linkedModule) intersect memberNames(linkedClass) /** Should method `m' get a forwarder in the mirror class? */ def shouldForward(m: Symbol): Boolean = ( m.owner != ObjectClass && m.isMethod && m.isPublic && !m.hasFlag(Flags.CASE | Flags.DEFERRED | Flags.SPECIALIZED | Flags.LIFTED) && !m.isConstructor && !m.isStaticMember && !membersInCommon(m.name.toString) ) for (m <- moduleClass.info.nonPrivateMembers) { if (shouldForward(m)) { log("Adding static forwarder for '%s' from %s to '%s'".format(m, className, moduleClass)) addForwarder(jclass, moduleClass, m, accessFlags) } else if (settings.debug.value) { log("No forwarder for '%s' from %s to '%s'".format(m, className, moduleClass)) } } } /** Dump a mirror class for a top-level module. A mirror class is a class * containing only static methods that forward to the corresponding method * on the MODULE instance of the given Scala object. It will only be * generated if there is no companion class: if there is, an attempt will * instead be made to add the forwarder methods to the companion class. */ def dumpMirrorClass(clasz: Symbol, sourceFile: String) { import JAccessFlags._ val moduleName = javaName(clasz) // + "$" val mirrorName = moduleName.substring(0, moduleName.length() - 1) val mirrorClass = fjbgContext.JClass(ACC_SUPER | ACC_PUBLIC | ACC_FINAL, mirrorName, JAVA_LANG_OBJECT.getName, JClass.NO_INTERFACES, sourceFile) log("Dumping mirror class for '%s'".format(mirrorClass.getName)) addForwarders(mirrorClass, clasz) val ssa = scalaSignatureAddingMarker(mirrorClass, clasz.companionSymbol) addAnnotations(mirrorClass, clasz.annotations ++ ssa) emitClass(mirrorClass, clasz) } var linearization: List[BasicBlock] = Nil var isModuleInitialized = false /** * @param m ... */ def genCode(m: IMethod) { val jcode = jmethod.getCode.asInstanceOf[JExtendedCode] def makeLabels(bs: List[BasicBlock]) = { if (settings.debug.value) log("Making labels for: " + method) mutable.HashMap(bs map (_ -> jcode.newLabel) : _*) } isModuleInitialized = false linearization = linearizer.linearize(m) val labels = makeLabels(linearization) /** local variables whose scope appears in this block. */ val varsInBlock: mutable.Set[Local] = new mutable.HashSet var nextBlock: BasicBlock = linearization.head def genBlocks(l: List[BasicBlock]): Unit = l match { case Nil => () case x :: Nil => nextBlock = null; genBlock(x) case x :: y :: ys => nextBlock = y; genBlock(x); genBlocks(y :: ys) } /** Generate exception handlers for the current method. */ def genExceptionHandlers() { /** Return a list of pairs of intervals where the handler is active. * The intervals in the list have to be inclusive in the beginning and * exclusive in the end: [start, end). */ def ranges(e: ExceptionHandler): List[(Int, Int)] = { var covered = e.covered var ranges: List[(Int, Int)] = Nil var start = -1 var end = -1 linearization foreach { b => if (! (covered contains b) ) { if (start >= 0) { // we're inside a handler range end = labels(b).getAnchor() ranges ::= (start, end) start = -1 } } else { if (start < 0) // we're not inside a handler range start = labels(b).getAnchor() end = endPC(b) covered -= b } } /* Add the last interval. Note that since the intervals are * open-ended to the right, we have to give a number past the actual * code! */ if (start >= 0) { ranges ::= (start, jcode.getPC()) } if (!covered.isEmpty) if (settings.debug.value) log("Some covered blocks were not found in method: " + method + " covered: " + covered + " not in " + linearization) ranges } for (e <- this.method.exh ; p <- ranges(e).sortBy(_._1)) { if (p._1 < p._2) { if (settings.debug.value) log("Adding exception handler " + e + "at block: " + e.startBlock + " for " + method + " from: " + p._1 + " to: " + p._2 + " catching: " + e.cls); val cls = if (e.cls == NoSymbol || e.cls == ThrowableClass) null else javaName(e.cls) jcode.addExceptionHandler(p._1, p._2, labels(e.startBlock).getAnchor(), cls) } else log("Empty exception range: " + p) } } def genBlock(b: BasicBlock) { labels(b).anchorToNext() if (settings.debug.value) log("Generating code for block: " + b + " at pc: " + labels(b).getAnchor()) var lastMappedPC = 0 var lastLineNr = 0 var crtPC = 0 varsInBlock.clear() for (instr <- b) { class CompilationException(msg: String) extends Exception(msg) { override def toString: String = { msg + "\nCurrent method: " + method + "\nCurrent block: " + b + "\nCurrent instruction: " + instr + "\n---------------------" + method.dump } } def assert(cond: Boolean, msg: String) = if (!cond) throw new CompilationException(msg) instr match { case THIS(clasz) => jcode.emitALOAD_0() case CONSTANT(const) => genConstant(jcode, const) case LOAD_ARRAY_ITEM(kind) => jcode.emitALOAD(javaType(kind)) case LOAD_LOCAL(local) => jcode.emitLOAD(indexOf(local), javaType(local.kind)) case lf @ LOAD_FIELD(field, isStatic) => var owner = javaName(lf.hostClass) if (settings.debug.value) log("LOAD_FIELD with owner: " + owner + " flags: " + Flags.flagsToString(field.owner.flags)) if (isStatic) jcode.emitGETSTATIC(owner, javaName(field), javaType(field)) else jcode.emitGETFIELD(owner, javaName(field), javaType(field)) case LOAD_MODULE(module) => // assert(module.isModule, "Expected module: " + module) if (settings.debug.value) log("generating LOAD_MODULE for: " + module + " flags: " + Flags.flagsToString(module.flags)); if (clasz.symbol == module.moduleClass && jmethod.getName() != nme.readResolve.toString) jcode.emitALOAD_0() else jcode.emitGETSTATIC(javaName(module) /* + "$" */ , nme.MODULE_INSTANCE_FIELD.toString, javaType(module)) case STORE_ARRAY_ITEM(kind) => jcode emitASTORE javaType(kind) case STORE_LOCAL(local) => jcode.emitSTORE(indexOf(local), javaType(local.kind)) case STORE_THIS(_) => // this only works for impl classes because the self parameter comes first // in the method signature. If that changes, this code has to be revisited. jcode.emitASTORE_0() case STORE_FIELD(field, isStatic) => val owner = javaName(field.owner) if (isStatic) jcode.emitPUTSTATIC(owner, javaName(field), javaType(field)) else jcode.emitPUTFIELD(owner, javaName(field), javaType(field)) case CALL_PRIMITIVE(primitive) => genPrimitive(primitive, instr.pos) /** Special handling to access native Array.clone() */ case call @ CALL_METHOD(definitions.Array_clone, Dynamic) => val target: String = javaType(call.targetTypeKind).getSignature() jcode.emitINVOKEVIRTUAL(target, "clone", arrayCloneType) case call @ CALL_METHOD(method, style) => val owner: String = javaName(method.owner) // reference the type of the receiver instead of the method owner (if not an interface!) val dynamicOwner = if (needsInterfaceCall(call.hostClass)) owner else javaName(call.hostClass) val jname = javaName(method) val jtype = javaType(method).asInstanceOf[JMethodType] style match { case InvokeDynamic => jcode.emitINVOKEINTERFACE("java.dyn.Dynamic", jname, jtype) case Dynamic => if (needsInterfaceCall(method.owner)) jcode.emitINVOKEINTERFACE(owner, jname, jtype) else jcode.emitINVOKEVIRTUAL(dynamicOwner, jname, jtype) case Static(instance) => if (instance) jcode.emitINVOKESPECIAL(owner, jname, jtype) else jcode.emitINVOKESTATIC(owner, jname, jtype) case SuperCall(_) => jcode.emitINVOKESPECIAL(owner, jname, jtype) // we initialize the MODULE$ field immediately after the super ctor if (isStaticModule(clasz.symbol) && !isModuleInitialized && jmethod.getName() == JMethod.INSTANCE_CONSTRUCTOR_NAME && jname == JMethod.INSTANCE_CONSTRUCTOR_NAME) { isModuleInitialized = true jcode.emitALOAD_0() jcode.emitPUTSTATIC(jclass.getName(), nme.MODULE_INSTANCE_FIELD.toString, jclass.getType()) } } case BOX(kind) => val boxedType = definitions.boxedClass(kind.toType.typeSymbol) val mtype = new JMethodType(javaType(boxedType), Array(javaType(kind))) jcode.emitINVOKESTATIC(BoxesRunTime, "boxTo" + boxedType.decodedName, mtype) case UNBOX(kind) => val mtype = new JMethodType(javaType(kind), Array(JAVA_LANG_OBJECT)) jcode.emitINVOKESTATIC(BoxesRunTime, "unboxTo" + kind.toType.typeSymbol.decodedName, mtype) case NEW(REFERENCE(cls)) => val className = javaName(cls) jcode emitNEW className case CREATE_ARRAY(elem, 1) => elem match { case REFERENCE(_) | ARRAY(_) => jcode emitANEWARRAY javaType(elem).asInstanceOf[JReferenceType] case _ => jcode emitNEWARRAY javaType(elem) } case CREATE_ARRAY(elem, dims) => jcode.emitMULTIANEWARRAY(javaType(ArrayN(elem, dims)).asInstanceOf[JReferenceType], dims) case IS_INSTANCE(tpe) => tpe match { case REFERENCE(cls) => jcode emitINSTANCEOF new JObjectType(javaName(cls)) case ARRAY(elem) => jcode emitINSTANCEOF new JArrayType(javaType(elem)) case _ => abort("Unknown reference type in IS_INSTANCE: " + tpe) } case CHECK_CAST(tpe) => tpe match { case REFERENCE(cls) => // No need to checkcast for Objects if (cls != ObjectClass) jcode emitCHECKCAST new JObjectType(javaName(cls)) case ARRAY(elem) => jcode emitCHECKCAST new JArrayType(javaType(elem)) case _ => abort("Unknown reference type in IS_INSTANCE: " + tpe) } case SWITCH(tags, branches) => val tagArray = new Array[Array[Int]](tags.length) var caze = tags var i = 0 while (i < tagArray.length) { tagArray(i) = new Array[Int](caze.head.length) caze.head.copyToArray(tagArray(i), 0) i += 1 caze = caze.tail } val branchArray = jcode.newLabels(tagArray.length) i = 0 while (i < branchArray.length) { branchArray(i) = labels(branches(i)) i += 1 } if (settings.debug.value) log("Emitting SWITCH:\ntags: " + tags + "\nbranches: " + branches) jcode.emitSWITCH(tagArray, branchArray, labels(branches.last), MIN_SWITCH_DENSITY) () case JUMP(whereto) => if (nextBlock != whereto) jcode.emitGOTO_maybe_W(labels(whereto), false) // default to short jumps case CJUMP(success, failure, cond, kind) => kind match { case BOOL | BYTE | CHAR | SHORT | INT => if (nextBlock == success) { jcode.emitIF_ICMP(conds(negate(cond)), labels(failure)) // .. and fall through to success label } else { jcode.emitIF_ICMP(conds(cond), labels(success)) if (nextBlock != failure) jcode.emitGOTO_maybe_W(labels(failure), false) } case REFERENCE(_) | ARRAY(_) => if (nextBlock == success) { jcode.emitIF_ACMP(conds(negate(cond)), labels(failure)) // .. and fall through to success label } else { jcode.emitIF_ACMP(conds(cond), labels(success)) if (nextBlock != failure) jcode.emitGOTO_maybe_W(labels(failure), false) } case _ => (kind: @unchecked) match { case LONG => jcode.emitLCMP() case FLOAT => if (cond == LT || cond == LE) jcode.emitFCMPG() else jcode.emitFCMPL() case DOUBLE => if (cond == LT || cond == LE) jcode.emitDCMPG() else jcode.emitDCMPL() } if (nextBlock == success) { jcode.emitIF(conds(negate(cond)), labels(failure)) // .. and fall through to success label } else { jcode.emitIF(conds(cond), labels(success)); if (nextBlock != failure) jcode.emitGOTO_maybe_W(labels(failure), false) } } case CZJUMP(success, failure, cond, kind) => kind match { case BOOL | BYTE | CHAR | SHORT | INT => if (nextBlock == success) { jcode.emitIF(conds(negate(cond)), labels(failure)) } else { jcode.emitIF(conds(cond), labels(success)) if (nextBlock != failure) jcode.emitGOTO_maybe_W(labels(failure), false) } case REFERENCE(_) | ARRAY(_) => val Success = success val Failure = failure (cond, nextBlock) match { case (EQ, Success) => jcode emitIFNONNULL labels(failure) case (NE, Failure) => jcode emitIFNONNULL labels(success) case (EQ, Failure) => jcode emitIFNULL labels(success) case (NE, Success) => jcode emitIFNULL labels(failure) case (EQ, _) => jcode emitIFNULL labels(success) jcode.emitGOTO_maybe_W(labels(failure), false) case (NE, _) => jcode emitIFNONNULL labels(success) jcode.emitGOTO_maybe_W(labels(failure), false) } case _ => (kind: @unchecked) match { case LONG => jcode.emitLCONST_0(); jcode.emitLCMP() case FLOAT => jcode.emitFCONST_0() if (cond == LT || cond == LE) jcode.emitFCMPG() else jcode.emitFCMPL() case DOUBLE => jcode.emitDCONST_0() if (cond == LT || cond == LE) jcode.emitDCMPG() else jcode.emitDCMPL() } if (nextBlock == success) { jcode.emitIF(conds(negate(cond)), labels(failure)) } else { jcode.emitIF(conds(cond), labels(success)) if (nextBlock != failure) jcode.emitGOTO_maybe_W(labels(failure), false) } } case RETURN(kind) => jcode emitRETURN javaType(kind) case THROW(_) => jcode.emitATHROW() case DROP(kind) => kind match { case LONG | DOUBLE => jcode.emitPOP2() case _ => jcode.emitPOP() } case DUP(kind) => kind match { case LONG | DOUBLE => jcode.emitDUP2() case _ => jcode.emitDUP() } case MONITOR_ENTER() => jcode.emitMONITORENTER() case MONITOR_EXIT() => jcode.emitMONITOREXIT() case SCOPE_ENTER(lv) => varsInBlock += lv lv.start = jcode.getPC() case SCOPE_EXIT(lv) => if (varsInBlock(lv)) { lv.ranges = (lv.start, jcode.getPC()) :: lv.ranges varsInBlock -= lv } else if (b.varsInScope(lv)) { lv.ranges = (labels(b).getAnchor(), jcode.getPC()) :: lv.ranges b.varsInScope -= lv } else assert(false, "Illegal local var nesting: " + method) case LOAD_EXCEPTION(_) => () } crtPC = jcode.getPC() // assert(instr.pos.source.isEmpty || instr.pos.source.get == (clasz.cunit.source), "sources don't match") // val crtLine = instr.pos.line.get(lastLineNr); val crtLine = try { if (instr.pos == NoPosition) lastLineNr else (instr.pos).line // check NoPosition to avoid costly exception } catch { case _: UnsupportedOperationException => log("Warning: wrong position in: " + method) lastLineNr } if (b.lastInstruction == instr) endPC(b) = jcode.getPC() //System.err.println("CRTLINE: " + instr.pos + " " + // /* (if (instr.pos < clasz.cunit.source.content.length) clasz.cunit.source.content(instr.pos) else '*') + */ " " + crtLine); if (crtPC > lastMappedPC) { jcode.completeLineNumber(lastMappedPC, crtPC, crtLine) lastMappedPC = crtPC lastLineNr = crtLine } } // local vars that survived this basic block for (lv <- varsInBlock) { lv.ranges = (lv.start, jcode.getPC()) :: lv.ranges } for (lv <- b.varsInScope) { lv.ranges = (labels(b).getAnchor(), jcode.getPC()) :: lv.ranges } } /** * @param primitive ... * @param pos ... */ def genPrimitive(primitive: Primitive, pos: Position) { primitive match { case Negation(kind) => kind match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitINEG() case LONG => jcode.emitLNEG() case FLOAT => jcode.emitFNEG() case DOUBLE => jcode.emitDNEG() case _ => abort("Impossible to negate a " + kind) } case Arithmetic(op, kind) => op match { case ADD => jcode.emitADD(javaType(kind)) case SUB => (kind: @unchecked) match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitISUB() case LONG => jcode.emitLSUB() case FLOAT => jcode.emitFSUB() case DOUBLE => jcode.emitDSUB() } case MUL => (kind: @unchecked) match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitIMUL() case LONG => jcode.emitLMUL() case FLOAT => jcode.emitFMUL() case DOUBLE => jcode.emitDMUL() } case DIV => (kind: @unchecked) match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitIDIV() case LONG => jcode.emitLDIV() case FLOAT => jcode.emitFDIV() case DOUBLE => jcode.emitDDIV() } case REM => (kind: @unchecked) match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitIREM() case LONG => jcode.emitLREM() case FLOAT => jcode.emitFREM() case DOUBLE => jcode.emitDREM() } case NOT => kind match { case BOOL | BYTE | CHAR | SHORT | INT => jcode.emitPUSH(-1) jcode.emitIXOR() case LONG => jcode.emitPUSH(-1l) jcode.emitLXOR() case _ => abort("Impossible to negate an " + kind) } case _ => abort("Unknown arithmetic primitive " + primitive) } case Logical(op, kind) => (op, kind) match { case (AND, LONG) => jcode.emitLAND() case (AND, INT) => jcode.emitIAND() case (AND, _) => jcode.emitIAND() if (kind != BOOL) jcode.emitT2T(javaType(INT), javaType(kind)); case (OR, LONG) => jcode.emitLOR() case (OR, INT) => jcode.emitIOR() case (OR, _) => jcode.emitIOR() if (kind != BOOL) jcode.emitT2T(javaType(INT), javaType(kind)); case (XOR, LONG) => jcode.emitLXOR() case (XOR, INT) => jcode.emitIXOR() case (XOR, _) => jcode.emitIXOR() if (kind != BOOL) jcode.emitT2T(javaType(INT), javaType(kind)); } case Shift(op, kind) => (op, kind) match { case (LSL, LONG) => jcode.emitLSHL() case (LSL, INT) => jcode.emitISHL() case (LSL, _) => jcode.emitISHL() jcode.emitT2T(javaType(INT), javaType(kind)) case (ASR, LONG) => jcode.emitLSHR() case (ASR, INT) => jcode.emitISHR() case (ASR, _) => jcode.emitISHR() jcode.emitT2T(javaType(INT), javaType(kind)) case (LSR, LONG) => jcode.emitLUSHR() case (LSR, INT) => jcode.emitIUSHR() case (LSR, _) => jcode.emitIUSHR() jcode.emitT2T(javaType(INT), javaType(kind)) } case Comparison(op, kind) => ((op, kind): @unchecked) match { case (CMP, LONG) => jcode.emitLCMP() case (CMPL, FLOAT) => jcode.emitFCMPL() case (CMPG, FLOAT) => jcode.emitFCMPG() case (CMPL, DOUBLE) => jcode.emitDCMPL() case (CMPG, DOUBLE) => jcode.emitDCMPL() } case Conversion(src, dst) => if (settings.debug.value) log("Converting from: " + src + " to: " + dst) if (dst == BOOL) { println("Illegal conversion at: " + clasz + " at: " + pos.source + ":" + pos.line) } else jcode.emitT2T(javaType(src), javaType(dst)) case ArrayLength(_) => jcode.emitARRAYLENGTH() case StartConcat => jcode emitNEW StringBuilderClassName jcode.emitDUP() jcode.emitINVOKESPECIAL(StringBuilderClassName, JMethod.INSTANCE_CONSTRUCTOR_NAME, JMethodType.ARGLESS_VOID_FUNCTION) case StringConcat(el) => val jtype = el match { case REFERENCE(_) | ARRAY(_) => JAVA_LANG_OBJECT case _ => javaType(el) } jcode.emitINVOKEVIRTUAL(StringBuilderClassName, "append", new JMethodType(StringBuilderType, Array(jtype))) case EndConcat => jcode.emitINVOKEVIRTUAL(StringBuilderClassName, "toString", toStringType) case _ => abort("Unimplemented primitive " + primitive) } } // genCode starts here genBlocks(linearization) if (this.method.exh != Nil) genExceptionHandlers; } /** Emit a Local variable table for debugging purposes. * Synthetic locals are skipped. All variables are method-scoped. */ private def genLocalVariableTable(m: IMethod, jcode: JCode) { val vars = m.locals filterNot (_.sym.isSynthetic) if (vars.isEmpty) return val pool = jclass.getConstantPool val pc = jcode.getPC() var anonCounter = 0 var entries = 0 vars.foreach { lv => lv.ranges = mergeEntries(lv.ranges.reverse); entries += lv.ranges.length } if (!jmethod.isStatic()) entries += 1 val lvTab = ByteBuffer.allocate(2 + 10 * entries) def emitEntry(name: String, signature: String, idx: Short, start: Short, end: Short) { lvTab putShort start lvTab putShort end lvTab putShort pool.addUtf8(name).toShort lvTab putShort pool.addUtf8(signature).toShort lvTab putShort idx } lvTab.putShort(entries.toShort) if (!jmethod.isStatic()) { emitEntry("this", jclass.getType().getSignature(), 0, 0.toShort, pc.toShort) } for (lv <- vars) { val name = if (javaName(lv.sym) eq null) { anonCounter += 1 "<anon" + anonCounter + ">" } else javaName(lv.sym) val index = indexOf(lv).toShort val tpe = javaType(lv.kind).getSignature() for ((start, end) <- lv.ranges) { emitEntry(name, tpe, index, start.toShort, (end - start).toShort) } } val attr = fjbgContext.JOtherAttribute(jclass, jcode, tpnme.LocalVariableTableATTR.toString, lvTab.array()) jcode addAttribute attr } /** For each basic block, the first PC address following it. */ val endPC = new mutable.HashMap[BasicBlock, Int] ////////////////////// local vars /////////////////////// def sizeOf(sym: Symbol): Int = sizeOf(toTypeKind(sym.tpe)) def sizeOf(k: TypeKind): Int = k match { case DOUBLE | LONG => 2 case _ => 1 } def indexOf(m: IMethod, sym: Symbol): Int = { val Some(local) = m lookupLocal sym indexOf(local) } def indexOf(local: Local): Int = { assert(local.index >= 0, "Invalid index for: " + local + "{" + local.## + "}: ") local.index } /** * Compute the indexes of each local variable of the given * method. Assumes parameters come first in the list of locals. */ def computeLocalVarsIndex(m: IMethod) { var idx = 1 if (m.symbol.isStaticMember) idx = 0; for (l <- m.locals) { if (settings.debug.value) log("Index value for " + l + "{" + l.## + "}: " + idx) l.index = idx idx += sizeOf(l.kind) } } ////////////////////// Utilities //////////////////////// /** Calls to methods in 'sym' need invokeinterface? */ def needsInterfaceCall(sym: Symbol): Boolean = { log("checking for interface call: " + sym.fullName) // the following call to 'info' may cause certain symbols to fail loading // because we're too late in the compilation chain (aliases to overloaded // symbols will not be properly resolved, see scala.Range, method // `super$++` that fails in UnPickler at LazyTypeRefAndAlias.complete if (sym.isTrait) sym.info // needed so that the type is up to date // (erasure may add lateINTERFACE to traits) sym.isInterface || (sym.isJavaDefined && sym.isNonBottomSubClass(ClassfileAnnotationClass)) } /** Merge adjacent ranges. */ private def mergeEntries(ranges: List[(Int, Int)]): List[(Int, Int)] = (ranges.foldLeft(Nil: List[(Int, Int)]) { (collapsed: List[(Int, Int)], p: (Int, Int)) => (collapsed, p) match { case (Nil, _) => List(p) case ((s1, e1) :: rest, (s2, e2)) if (e1 == s2) => (s1, e2) :: rest case _ => p :: collapsed }}).reverse def assert(cond: Boolean, msg: => String) = if (!cond) { method.dump abort(msg + "\nMethod: " + method) } def assert(cond: Boolean) { assert(cond, "Assertion failed.") } } /** * Return the Java modifiers for the given symbol. * Java modifiers for classes: * - public, abstract, final, strictfp (not used) * for interfaces: * - the same as for classes, without 'final' * for fields: * - public, private (*) * - static, final * for methods: * - the same as for fields, plus: * - abstract, synchronized (not used), strictfp (not used), native (not used) * * (*) protected cannot be used, since inner classes 'see' protected members, * and they would fail verification after lifted. */ def javaFlags(sym: Symbol): Int = { def mkFlags(args: Int*) = args.foldLeft(0)(_ | _) // constructors of module classes should be private // PP: why are they only being marked private at this stage and not earlier? val isConsideredPrivate = sym.isPrivate || (sym.isPrimaryConstructor && isTopLevelModule(sym.owner)) mkFlags( if (isConsideredPrivate) ACC_PRIVATE else ACC_PUBLIC, if (sym.isDeferred || sym.hasAbstractFlag) ACC_ABSTRACT else 0, if (sym.isInterface) ACC_INTERFACE else 0, if (sym.isFinal && !sym.enclClass.isInterface && !sym.isClassConstructor) ACC_FINAL else 0, if (sym.isStaticMember) ACC_STATIC else 0, if (sym.isBridge || sym.hasFlag(Flags.MIXEDIN) && sym.isMethod) ACC_BRIDGE else 0, if (sym.isClass && !sym.isInterface) ACC_SUPER else 0, if (sym.isVarargsMethod) ACC_VARARGS else 0 ) } def isTopLevelModule(sym: Symbol): Boolean = atPhase (currentRun.picklerPhase.next) { sym.isModuleClass && !sym.isImplClass && !sym.isNestedClass } def isStaticModule(sym: Symbol): Boolean = { sym.isModuleClass && !sym.isImplClass && !sym.isLifted } } Other Scala examples (source code examples)Here is a short list of links related to this Scala GenJVM.scala source code file: |
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