diff options
Diffstat (limited to 'src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala')
| -rw-r--r-- | src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala | 138 |
1 files changed, 130 insertions, 8 deletions
diff --git a/src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala b/src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala index baf82032f7..e8630c65d9 100644 --- a/src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala +++ b/src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala @@ -3,9 +3,11 @@ package backend.jvm package analysis import scala.annotation.switch -import scala.tools.asm.{Opcodes, Handle, Type, Label} +import scala.tools.asm.{Handle, Type, Label} +import scala.tools.asm.Opcodes._ import scala.tools.asm.tree._ import scala.tools.asm.tree.analysis.{Frame, BasicInterpreter, Analyzer, Value} +import GenBCode._ import scala.tools.nsc.backend.jvm.BTypes._ import scala.tools.nsc.backend.jvm.opt.BytecodeUtils import scala.tools.nsc.backend.jvm.opt.BytecodeUtils._ @@ -24,6 +26,7 @@ import scala.collection.convert.decorateAsScala._ */ class BackendUtils[BT <: BTypes](val btypes: BT) { import btypes._ + import btypes.coreBTypes._ import callGraph.ClosureInstantiation /** @@ -73,8 +76,6 @@ class BackendUtils[BT <: BTypes](val btypes: BT) { */ def addLambdaDeserialize(classNode: ClassNode): Unit = { val cw = classNode - import scala.tools.asm.Opcodes._ - import btypes.coreBTypes._ // Make sure to reference the ClassBTypes of all types that are used in the code generated // here (e.g. java/util/Map) are initialized. Initializing a ClassBType adds it to the @@ -145,14 +146,137 @@ class BackendUtils[BT <: BTypes](val btypes: BT) { (result, map, hasSerializableClosureInstantiation) } - def getBoxedUnit: FieldInsnNode = new FieldInsnNode(Opcodes.GETSTATIC, coreBTypes.srBoxedUnitRef.internalName, "UNIT", coreBTypes.srBoxedUnitRef.descriptor) + def getBoxedUnit: FieldInsnNode = new FieldInsnNode(GETSTATIC, srBoxedUnitRef.internalName, "UNIT", srBoxedUnitRef.descriptor) private val anonfunAdaptedName = """.*\$anonfun\$\d+\$adapted""".r def hasAdaptedImplMethod(closureInit: ClosureInstantiation): Boolean = { - BytecodeUtils.isrJFunctionType(Type.getReturnType(closureInit.lambdaMetaFactoryCall.indy.desc).getInternalName) && + isrJFunctionType(Type.getReturnType(closureInit.lambdaMetaFactoryCall.indy.desc).getInternalName) && anonfunAdaptedName.pattern.matcher(closureInit.lambdaMetaFactoryCall.implMethod.getName).matches } + private def primitiveAsmTypeToBType(primitiveType: Type): PrimitiveBType = (primitiveType.getSort: @switch) match { + case Type.BOOLEAN => BOOL + case Type.BYTE => BYTE + case Type.CHAR => CHAR + case Type.SHORT => SHORT + case Type.INT => INT + case Type.LONG => LONG + case Type.FLOAT => FLOAT + case Type.DOUBLE => DOUBLE + case _ => null + } + + def isScalaBox(insn: MethodInsnNode): Boolean = { + insn.owner == srBoxesRunTimeRef.internalName && { + val args = Type.getArgumentTypes(insn.desc) + args.length == 1 && (srBoxesRuntimeBoxToMethods.get(primitiveAsmTypeToBType(args(0))) match { + case Some(MethodNameAndType(name, tp)) => name == insn.name && tp.descriptor == insn.desc + case _ => false + }) + } + } + + def getScalaBox(primitiveType: Type): MethodInsnNode = { + val bType = primitiveAsmTypeToBType(primitiveType) + val MethodNameAndType(name, methodBType) = srBoxesRuntimeBoxToMethods(bType) + new MethodInsnNode(INVOKESTATIC, srBoxesRunTimeRef.internalName, name, methodBType.descriptor, /*itf =*/ false) + } + + def isScalaUnbox(insn: MethodInsnNode): Boolean = { + insn.owner == srBoxesRunTimeRef.internalName && (srBoxesRuntimeUnboxToMethods.get(primitiveAsmTypeToBType(Type.getReturnType(insn.desc))) match { + case Some(MethodNameAndType(name, tp)) => name == insn.name && tp.descriptor == insn.desc + case _ => false + }) + } + + def getScalaUnbox(primitiveType: Type): MethodInsnNode = { + val bType = primitiveAsmTypeToBType(primitiveType) + val MethodNameAndType(name, methodBType) = srBoxesRuntimeUnboxToMethods(bType) + new MethodInsnNode(INVOKESTATIC, srBoxesRunTimeRef.internalName, name, methodBType.descriptor, /*itf =*/ false) + } + + private def calleeInMap(insn: MethodInsnNode, map: Map[InternalName, MethodNameAndType]): Boolean = map.get(insn.owner) match { + case Some(MethodNameAndType(name, tp)) => insn.name == name && insn.desc == tp.descriptor + case _ => false + } + + def isJavaBox(insn: MethodInsnNode): Boolean = calleeInMap(insn, javaBoxMethods) + def isJavaUnbox(insn: MethodInsnNode): Boolean = calleeInMap(insn, javaUnboxMethods) + + def isPredefAutoBox(insn: MethodInsnNode): Boolean = { + insn.owner == PredefRef.internalName && (predefAutoBoxMethods.get(insn.name) match { + case Some(tp) => insn.desc == tp.descriptor + case _ => false + }) + } + + def isPredefAutoUnbox(insn: MethodInsnNode): Boolean = { + insn.owner == PredefRef.internalName && (predefAutoUnboxMethods.get(insn.name) match { + case Some(tp) => insn.desc == tp.descriptor + case _ => false + }) + } + + def isRefCreate(insn: MethodInsnNode): Boolean = calleeInMap(insn, srRefCreateMethods) + def isRefZero(insn: MethodInsnNode): Boolean = calleeInMap(insn, srRefZeroMethods) + + def runtimeRefClassBoxedType(refClass: InternalName): Type = Type.getArgumentTypes(srRefCreateMethods(refClass).methodType.descriptor)(0) + + def isSideEffectFreeCall(insn: MethodInsnNode): Boolean = { + isScalaBox(insn) || isScalaUnbox(insn) || + isJavaBox(insn) || // not java unbox, it may NPE + isSideEffectFreeConstructorCall(insn) + } + + def isNonNullMethodInvocation(mi: MethodInsnNode): Boolean = { + isJavaBox(mi) || isScalaBox(mi) || isPredefAutoBox(mi) || isRefCreate(mi) || isRefZero(mi) + } + + def isModuleLoad(insn: AbstractInsnNode, moduleName: InternalName): Boolean = insn match { + case fi: FieldInsnNode => fi.getOpcode == GETSTATIC && fi.owner == moduleName && fi.name == "MODULE$" && fi.desc == ("L" + moduleName + ";") + case _ => false + } + + def isPredefLoad(insn: AbstractInsnNode) = isModuleLoad(insn, PredefRef.internalName) + + def isPrimitiveBoxConstructor(insn: MethodInsnNode): Boolean = calleeInMap(insn, primitiveBoxConstructors) + def isRuntimeRefConstructor(insn: MethodInsnNode): Boolean = calleeInMap(insn, srRefConstructors) + def isTupleConstructor(insn: MethodInsnNode): Boolean = calleeInMap(insn, tupleClassConstructors) + + // unused objects created by these constructors are eliminated by pushPop + private lazy val sideEffectFreeConstructors: Set[(String, String)] = { + val ownerDesc = (p: (InternalName, MethodNameAndType)) => (p._1, p._2.methodType.descriptor) + primitiveBoxConstructors.map(ownerDesc).toSet ++ + srRefConstructors.map(ownerDesc) ++ + tupleClassConstructors.map(ownerDesc) ++ Set( + (ObjectRef.internalName, MethodBType(Nil, UNIT).descriptor), + (StringRef.internalName, MethodBType(Nil, UNIT).descriptor), + (StringRef.internalName, MethodBType(List(StringRef), UNIT).descriptor), + (StringRef.internalName, MethodBType(List(ArrayBType(CHAR)), UNIT).descriptor)) + } + + def isSideEffectFreeConstructorCall(insn: MethodInsnNode): Boolean = { + insn.name == INSTANCE_CONSTRUCTOR_NAME && sideEffectFreeConstructors((insn.owner, insn.desc)) + } + + private lazy val classesOfSideEffectFreeConstructors = sideEffectFreeConstructors.map(_._1) + + def isNewForSideEffectFreeConstructor(insn: AbstractInsnNode) = { + insn.getOpcode == NEW && { + val ti = insn.asInstanceOf[TypeInsnNode] + classesOfSideEffectFreeConstructors.contains(ti.desc) + } + } + + def isBoxedUnit(insn: AbstractInsnNode) = { + insn.getOpcode == GETSTATIC && { + val fi = insn.asInstanceOf[FieldInsnNode] + fi.owner == srBoxedUnitRef.internalName && fi.name == "UNIT" && fi.desc == srBoxedUnitRef.descriptor + } + } + + def isrJFunctionType(internalName: InternalName): Boolean = srJFunctionRefs(internalName) + /** * Visit the class node and collect all referenced nested classes. */ @@ -287,15 +411,13 @@ class BackendUtils[BT <: BTypes](val btypes: BT) { * Analyzer: its implementation also skips over unreachable code in the same way. */ def computeMaxLocalsMaxStack(method: MethodNode): Unit = { - import Opcodes._ - if (isAbstractMethod(method) || isNativeMethod(method)) { method.maxLocals = 0 method.maxStack = 0 } else if (!maxLocalsMaxStackComputed(method)) { val size = method.instructions.size - var maxLocals = (Type.getArgumentsAndReturnSizes(method.desc) >> 2) - (if (isStaticMethod(method)) 1 else 0) + var maxLocals = parametersSize(method) var maxStack = 0 // queue of instruction indices where analysis should start |