Verify bytecode after mandatory transformations and after optimizations

compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/MethodVerifier.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.codegen.optimization
+
+import org.jetbrains.kotlin.codegen.optimization.transformer.MethodTransformer
+import org.jetbrains.org.objectweb.asm.tree.MethodNode
+import org.jetbrains.org.objectweb.asm.tree.analysis.BasicVerifier
+
+class MethodVerifier(private val checkPoint: String) : MethodTransformer() {
+    override fun transform(internalClassName: String, methodNode: MethodNode) {
+        try {
+            analyze(internalClassName, methodNode, BasicVerifier())
+        }
+        catch (e: Throwable) {
+            throw AssertionError("$checkPoint: incorrect bytecode", e)
+        }
+    }
+}

compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/OptimizationMethodVisitor.kt

@@ -47,7 +47,10 @@ class OptimizationMethodVisitor(
     companion object {
         private val MEMORY_LIMIT_BY_METHOD_MB = 50
 
-        private val MANDATORY_METHOD_TRANSFORMER = FixStackWithLabelNormalizationMethodTransformer()
+        private val MANDATORY_METHOD_TRANSFORMER = CompositeMethodTransformer(
+                FixStackWithLabelNormalizationMethodTransformer(),
+                MethodVerifier("AFTER mandatory stack transformations")
+        )
 
         private val OPTIMIZATION_TRANSFORMER = CompositeMethodTransformer(
                 CapturedVarsOptimizationMethodTransformer(),
@@ -59,7 +62,8 @@ class OptimizationMethodVisitor(
                 PopBackwardPropagationTransformer(),
                 DeadCodeEliminationMethodTransformer(),
                 RedundantGotoMethodTransformer(),
-                RedundantNopsCleanupMethodTransformer()
+                RedundantNopsCleanupMethodTransformer(),
+                MethodVerifier("AFTER optimizations")
         )
 
         fun canBeOptimized(node: MethodNode): Boolean {