1 files changed, 16 insertions, 1 deletions
diff --git a/asm/src/main/java/org/objectweb/asm/ClassReader.java b/asm/src/main/java/org/objectweb/asm/ClassReader.java
index 7f0e4e72..2cfef457 100644
--- a/asm/src/main/java/org/objectweb/asm/ClassReader.java
+++ b/asm/src/main/java/org/objectweb/asm/ClassReader.java
@@ -194,7 +194,7 @@ public class ClassReader {
     this.b = classFileBuffer;
     // Check the class' major_version. This field is after the magic and minor_version fields, which
     // use 4 and 2 bytes respectively.
-    if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V20) {
+    if (checkClassVersion && readShort(classFileOffset + 6) > Opcodes.V21) {
       throw new IllegalArgumentException(
           "Unsupported class file major version " + readShort(classFileOffset + 6));
     }
@@ -2050,6 +2050,7 @@ public class ClassReader {
     currentOffset = bytecodeStartOffset;
     while (currentOffset < bytecodeEndOffset) {
       final int currentBytecodeOffset = currentOffset - bytecodeStartOffset;
+      readBytecodeInstructionOffset(currentBytecodeOffset);
 
       // Visit the label and the line number(s) for this bytecode offset, if any.
       Label currentLabel = labels[currentBytecodeOffset];
@@ -2666,6 +2667,20 @@ public class ClassReader {
   }
 
   /**
+   * Handles the bytecode offset of the next instruction to be visited in {@link
+   * #accept(ClassVisitor,int)}. This method is called just before the instruction and before its
+   * associated label and stack map frame, if any. The default implementation of this method does
+   * nothing. Subclasses can override this method to store the argument in a mutable field, for
+   * instance, so that {@link MethodVisitor} instances can get the bytecode offset of each visited
+   * instruction (if so, the usual concurrency issues related to mutable data should be addressed).
+   *
+   * @param bytecodeOffset the bytecode offset of the next instruction to be visited.
+   */
+  protected void readBytecodeInstructionOffset(final int bytecodeOffset) {
+    // Do nothing by default.
+  }
+
+  /**
    * Returns the label corresponding to the given bytecode offset. The default implementation of
    * this method creates a label for the given offset if it has not been already created.
    *