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/* NSC -- new Scala compiler
* Copyright 2005-2014 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc.backend.jvm
import scala.tools.asm.tree.{InsnList, AbstractInsnNode, ClassNode, MethodNode}
import java.io.{StringWriter, PrintWriter}
import scala.tools.asm.util.{TraceClassVisitor, TraceMethodVisitor, Textifier}
import scala.tools.asm.ClassReader
import scala.collection.convert.decorateAsScala._
object AsmUtils {
/**
* Print the bytecode of methods generated by GenBCode to the standard output. Only methods
* whose name contains `traceMethodPattern` are traced.
*/
final val traceMethodEnabled = false
final val traceMethodPattern = ""
/**
* Print the bytecode of classes generated by GenBCode to the standard output.
*/
final val traceClassEnabled = false
final val traceClassPattern = ""
/**
* Print the bytedcode of classes as they are serialized by the ASM library. The serialization
* performed by `asm.ClassWriter` can change the code generated by GenBCode. For example, it
* introduces stack map frames, it computes the maximal stack sizes, and it replaces dead
* code by NOPs (see also https://github.com/scala/scala/pull/3726#issuecomment-42861780).
*/
final val traceSerializedClassEnabled = false
final val traceSerializedClassPattern = ""
def traceMethod(mnode: MethodNode): Unit = {
println(s"Bytecode for method ${mnode.name}")
println(textify(mnode))
}
def traceClass(cnode: ClassNode): Unit = {
println(s"Bytecode for class ${cnode.name}")
println(textify(cnode))
}
def traceClass(bytes: Array[Byte]): Unit = traceClass(readClass(bytes))
def readClass(bytes: Array[Byte]): ClassNode = {
val node = new ClassNode()
new ClassReader(bytes).accept(node, 0)
node
}
/**
* Returns a human-readable representation of the cnode ClassNode.
*/
def textify(cnode: ClassNode): String = {
val trace = new TraceClassVisitor(new PrintWriter(new StringWriter))
cnode.accept(trace)
val sw = new StringWriter
val pw = new PrintWriter(sw)
trace.p.print(pw)
sw.toString
}
/**
* Returns a human-readable representation of the code in the mnode MethodNode.
*/
def textify(mnode: MethodNode): String = {
val trace = new TraceClassVisitor(new PrintWriter(new StringWriter))
mnode.accept(trace)
val sw = new StringWriter
val pw = new PrintWriter(sw)
trace.p.print(pw)
sw.toString
}
/**
* Returns a human-readable representation of the given instruction.
*/
def textify(insn: AbstractInsnNode): String = {
val trace = new TraceMethodVisitor(new Textifier)
insn.accept(trace)
val sw = new StringWriter
val pw = new PrintWriter(sw)
trace.p.print(pw)
sw.toString.trim
}
/**
* Returns a human-readable representation of the given instruction sequence.
*/
def textify(insns: Iterator[AbstractInsnNode]): String = {
val trace = new TraceMethodVisitor(new Textifier)
insns.foreach(_.accept(trace))
val sw: StringWriter = new StringWriter
val pw: PrintWriter = new PrintWriter(sw)
trace.p.print(pw)
sw.toString.trim
}
/**
* Returns a human-readable representation of the given instruction sequence.
*/
def textify(insns: InsnList): String = textify(insns.iterator().asScala)
}
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