[asm-cherry-pick] Log names on method size overflow

Cherry-pick of asm-part of 3fa2c97, which contains a test. For
class size overflows, scalac's error message already contains the
class name (test in 19511d8).

Author: adriaanm

src/asm/scala/tools/asm/ClassWriter.java

@@ -1746,6 +1746,15 @@ private void put(final Item i) {
         items[index] = i;
     }
 
+    /**
+     * Find item that whose index is `index`.
+     */
+    public Item findItemByIndex(int index) {
+        int i = 0;
+        while (i < items.length && (items[i] == null || items[i].index != index)) i++;
+        return items[i];
+    }
+
     /**
      * Puts one byte and two shorts into the constant pool.
      *

src/asm/scala/tools/asm/MethodWriter.java

@@ -2033,7 +2033,10 @@ final int getSize() {
         int size = 8;
         if (code.length > 0) {
             if (code.length > 65536) {
-                throw new RuntimeException("Method code too large!");
+                String nameString = "";
+                Item nameItem = cw.findItemByIndex(name);
+                if (nameItem != null) nameString = nameItem.strVal1 +"'s ";
+                throw new RuntimeException("Method "+ nameString +"code too large!");
             }
             cw.newUTF8("Code");
             size += 18 + code.length + 8 * handlerCount;