auto import from //depot/cupcake/@135843

1 files changed, 62 insertions, 0 deletions

diff --git a/dx/src/com/android/dx/dex/code/ZeroSizeInsn.java b/dx/src/com/android/dx/dex/code/ZeroSizeInsn.java
new file mode 100644
index 000000000..2ddb181e0
--- /dev/null
+++ b/dx/src/com/android/dx/dex/code/ZeroSizeInsn.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * 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 com.android.dx.dex.code;
+
+import com.android.dx.rop.code.RegisterSpecList;
+import com.android.dx.rop.code.SourcePosition;
+import com.android.dx.util.AnnotatedOutput;
+
+/**
+ * Pseudo-instruction base class for zero-size (no code emitted)
+ * instructions, which are generally used for tracking metainformation
+ * about the code they are adjacent to.
+ */
+public abstract class ZeroSizeInsn extends DalvInsn {
+    /**
+     * Constructs an instance. The output address of this instance is initially
+     * unknown (<code>-1</code>).
+     * 
+     * @param position non-null; source position
+     */
+    public ZeroSizeInsn(SourcePosition position) {
+        super(Dops.SPECIAL_FORMAT, position, RegisterSpecList.EMPTY);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public final int codeSize() {
+        return 0;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public final void writeTo(AnnotatedOutput out) {
+        // Nothing to do here, for this class.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public final DalvInsn withOpcode(Dop opcode) {
+        throw new RuntimeException("unsupported");
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public DalvInsn withRegisterOffset(int delta) {
+        return withRegisters(getRegisters().withOffset(delta));
+    }
+}