1 files changed, 92 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/dex/code/form/Form20t.java b/dx/src/com/android/dx/dex/code/form/Form20t.java
new file mode 100644
index 0000000..0b5a3b2
--- /dev/null
+++ b/dx/src/com/android/dx/dex/code/form/Form20t.java
@@ -0,0 +1,92 @@
+/*
+ * 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.form;
+
+import com.android.dx.dex.code.DalvInsn;
+import com.android.dx.dex.code.InsnFormat;
+import com.android.dx.dex.code.TargetInsn;
+import com.android.dx.util.AnnotatedOutput;
+
+/**
+ * Instruction format {@code 20t}. See the instruction format spec
+ * for details.
+ */
+public final class Form20t extends InsnFormat {
+    /** {@code non-null;} unique instance of this class */
+    public static final InsnFormat THE_ONE = new Form20t();
+
+    /**
+     * Constructs an instance. This class is not publicly
+     * instantiable. Use {@link #THE_ONE}.
+     */
+    private Form20t() {
+        // This space intentionally left blank.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String insnArgString(DalvInsn insn) {
+        return branchString(insn);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
+        return branchComment(insn);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int codeSize() {
+        return 2;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean isCompatible(DalvInsn insn) {
+        if (!((insn instanceof TargetInsn) &&
+              (insn.getRegisters().size() == 0))) {
+            return false;
+        }
+
+        TargetInsn ti = (TargetInsn) insn;
+        return ti.hasTargetOffset() ? branchFits(ti) : true;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean branchFits(TargetInsn insn) {
+        int offset = insn.getTargetOffset();
+
+        // Note: A zero offset would fit, but it is prohibited by the spec.
+        return (offset != 0) && signedFitsInShort(offset);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public InsnFormat nextUp() {
+        return Form30t.THE_ONE;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
+        int offset = ((TargetInsn) insn).getTargetOffset();
+
+        write(out, opcodeUnit(insn, 0), (short) offset);
+    }
+}