Better diagnostic for optimizer crashes

Author: retronym

src/compiler/scala/tools/nsc/backend/jvm/analysis/BackendUtils.scala

@@ -6,11 +6,12 @@ import scala.annotation.switch
 import scala.tools.asm.{Handle, Type}
 import scala.tools.asm.Opcodes._
 import scala.tools.asm.tree._
-import scala.tools.asm.tree.analysis.{Frame, BasicInterpreter, Analyzer, Value}
+import scala.tools.asm.tree.analysis._
 import GenBCode._
 import scala.tools.nsc.backend.jvm.BTypes._
 import scala.tools.nsc.backend.jvm.opt.BytecodeUtils._
 import java.lang.invoke.LambdaMetafactory
+
 import scala.collection.mutable
 import scala.collection.JavaConverters._
 
@@ -32,8 +33,13 @@ class BackendUtils[BT <: BTypes](val btypes: BT) {
    */
   class AsmAnalyzer[V <: Value](methodNode: MethodNode, classInternalName: InternalName, val analyzer: Analyzer[V] = new Analyzer(new BasicInterpreter)) {
     computeMaxLocalsMaxStack(methodNode)
-    analyzer.analyze(classInternalName, methodNode)
-    def frameAt(instruction: AbstractInsnNode): Frame[V] = analyzer.frameAt(instruction, methodNode)
+    try {
+      analyzer.analyze(classInternalName, methodNode)
+    } catch {
+      case ae: AnalyzerException =>
+        throw new AnalyzerException(null, "While processing " + classInternalName + "." + methodNode.name, ae)
+    }
+      def frameAt(instruction: AbstractInsnNode): Frame[V] = analyzer.frameAt(instruction, methodNode)
   }
 
   /**