1 files changed, 82 insertions, 0 deletions
diff --git a/dexgen/src/com/android/dexgen/rop/cst/CstLiteralBits.java b/dexgen/src/com/android/dexgen/rop/cst/CstLiteralBits.java
new file mode 100644
index 0000000..97e8bd1
--- /dev/null
+++ b/dexgen/src/com/android/dexgen/rop/cst/CstLiteralBits.java
@@ -0,0 +1,82 @@
+/*
+ * 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.dexgen.rop.cst;
+
+/**
+ * Constants which are literal bitwise values of some sort.
+ */
+public abstract class CstLiteralBits
+        extends TypedConstant {
+    /**
+     * Returns whether or not this instance's value may be accurately
+     * represented as an {@code int}. The rule is that if there
+     * is an {@code int} which may be sign-extended to yield this
+     * instance's value, then this method returns {@code true}.
+     * Otherwise, it returns {@code false}.
+     *
+     * @return {@code true} iff this instance fits in an {@code int}
+     */
+    public abstract boolean fitsInInt();
+
+    /**
+     * Gets the value as {@code int} bits. If this instance contains
+     * more bits than fit in an {@code int}, then this returns only
+     * the low-order bits.
+     *
+     * @return the bits
+     */
+    public abstract int getIntBits();
+
+    /**
+     * Gets the value as {@code long} bits. If this instance contains
+     * fewer bits than fit in a {@code long}, then the result of this
+     * method is the sign extension of the value.
+     *
+     * @return the bits
+     */
+    public abstract long getLongBits();
+
+    /**
+     * Returns true if this value can fit in 16 bits with sign-extension.
+     *
+     * @return true if the sign-extended lower 16 bits are the same as
+     * the value.
+     */
+    public boolean fitsIn16Bits() {
+        if (! fitsInInt()) {
+            return false;
+        }
+
+        int bits = getIntBits();
+        return (short) bits == bits;
+    }
+
+    /**
+     * Returns true if this value can fit in 8 bits with sign-extension.
+     *
+     * @return true if the sign-extended lower 8 bits are the same as
+     * the value.
+     */
+    public boolean fitsIn8Bits() {
+        if (! fitsInInt()) {
+            return false;
+        }
+
+        int bits = getIntBits();
+        return (byte) bits == bits;
+    }
+}