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|
/* __ *\
** ________ ___ / / ___ __ ____ Scala.js IR **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2014, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.ir
import Trees._
object Traversers {
class Traverser {
def traverse(tree: Tree): Unit = tree match {
// Definitions
case VarDef(ident, vtpe, mutable, rhs) =>
traverse(rhs)
// Control flow constructs
case Block(stats) =>
stats foreach traverse
case Labeled(label, tpe, body) =>
traverse(body)
case Assign(lhs, rhs) =>
traverse(lhs)
traverse(rhs)
case Return(expr, label) =>
traverse(expr)
case If(cond, thenp, elsep) =>
traverse(cond)
traverse(thenp)
traverse(elsep)
case While(cond, body, label) =>
traverse(cond)
traverse(body)
case DoWhile(body, cond, label) =>
traverse(body)
traverse(cond)
case Try(block, errVar, handler, finalizer) =>
traverse(block)
traverse(handler)
traverse(finalizer)
case Throw(expr) =>
traverse(expr)
case Match(selector, cases, default) =>
traverse(selector)
cases foreach (c => (c._1 map traverse, traverse(c._2)))
traverse(default)
// Scala expressions
case New(cls, ctor, args) =>
args foreach traverse
case StoreModule(cls, value) =>
traverse(value)
case Select(qualifier, item, mutable) =>
traverse(qualifier)
case Apply(receiver, method, args) =>
traverse(receiver)
args foreach traverse
case StaticApply(receiver, cls, method, args) =>
traverse(receiver)
args foreach traverse
case TraitImplApply(impl, method, args) =>
args foreach traverse
case UnaryOp(op, lhs) =>
traverse(lhs)
case BinaryOp(op, lhs, rhs) =>
traverse(lhs)
traverse(rhs)
case NewArray(tpe, lengths) =>
lengths foreach traverse
case ArrayValue(tpe, elems) =>
elems foreach traverse
case ArrayLength(array) =>
traverse(array)
case ArraySelect(array, index) =>
traverse(array)
traverse(index)
case RecordValue(tpe, elems) =>
elems foreach traverse
case IsInstanceOf(expr, cls) =>
traverse(expr)
case AsInstanceOf(expr, cls) =>
traverse(expr)
case Unbox(expr, charCode) =>
traverse(expr)
case GetClass(expr) =>
traverse(expr)
case CallHelper(helper, args) =>
args foreach traverse
// JavaScript expressions
case JSNew(ctor, args) =>
traverse(ctor)
args foreach traverse
case JSDotSelect(qualifier, item) =>
traverse(qualifier)
case JSBracketSelect(qualifier, item) =>
traverse(qualifier)
traverse(item)
case JSFunctionApply(fun, args) =>
traverse(fun)
args foreach traverse
case JSDotMethodApply(receiver, method, args) =>
traverse(receiver)
args foreach traverse
case JSBracketMethodApply(receiver, method, args) =>
traverse(receiver)
traverse(method)
args foreach traverse
case JSDelete(prop) =>
traverse(prop)
case JSUnaryOp(op, lhs) =>
traverse(lhs)
case JSBinaryOp(op, lhs, rhs) =>
traverse(lhs)
traverse(rhs)
case JSArrayConstr(items) =>
items foreach traverse
case JSObjectConstr(fields) =>
fields foreach { f => traverse(f._2) }
// Atomic expressions
case Closure(captureParams, params, body, captureValues) =>
traverse(body)
captureValues.foreach(traverse)
// Classes
case ClassDef(name, kind, parent, ancestors, defs) =>
defs foreach traverse
case MethodDef(name, args, resultType, body) =>
traverse(body)
case PropertyDef(name, getterBody, setterArg, setterBody) =>
traverse(getterBody)
traverse(setterBody)
case ConstructorExportDef(fullName, args, body) =>
traverse(body)
// Trees that need not be traversed
case _:Skip | _:Continue | _:LoadModule | _:JSEnvInfo |
_:Literal | _:VarRef | _:This | _:ModuleExportDef | EmptyTree =>
case _ =>
sys.error(s"Invalid tree in traverse() of class ${tree.getClass}")
}
}
}
|
