1 files changed, 76 insertions, 0 deletions
diff --git a/src/Java/sun/repackage/Label.java b/src/Java/sun/repackage/Label.java
new file mode 100644
index 0000000000..86acf54fe6
--- /dev/null
+++ b/src/Java/sun/repackage/Label.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.repackage;
+
+import java.util.List;
+import java.util.ArrayList;
+
+/** Allows forward references in bytecode streams emitted by
+    ClassFileAssembler. Assumes that the start of the method body is
+    the first byte in the assembler's buffer. May be used at more than
+    one branch site. */
+
+class Label {
+    static class PatchInfo {
+        PatchInfo(ClassFileAssembler asm,
+                  short instrBCI,
+                  short patchBCI,
+                  int stackDepth)
+        {
+            this.asm = asm;
+            this.instrBCI   = instrBCI;
+            this.patchBCI   = patchBCI;
+            this.stackDepth = stackDepth;
+        }
+        // This won't work for more than one assembler anyway, so this is
+        // unnecessary
+        final ClassFileAssembler asm;
+        final short instrBCI;
+        final short patchBCI;
+        final int   stackDepth;
+    }
+    private List<PatchInfo> patches = new ArrayList<>();
+
+    public Label() {
+    }
+
+    void add(ClassFileAssembler asm,
+             short instrBCI,
+             short patchBCI,
+             int stackDepth)
+    {
+        patches.add(new PatchInfo(asm, instrBCI, patchBCI, stackDepth));
+    }
+
+    public void bind() {
+        for (PatchInfo patch : patches){
+            short curBCI = patch.asm.getLength();
+            short offset = (short) (curBCI - patch.instrBCI);
+            patch.asm.emitShort(patch.patchBCI, offset);
+            patch.asm.setStack(patch.stackDepth);
+        }
+    }
+}