1 files changed, 132 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/dex/code/TargetInsn.java b/dx/src/com/android/dx/dex/code/TargetInsn.java
new file mode 100644
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--- /dev/null
+++ b/dx/src/com/android/dx/dex/code/TargetInsn.java
@@ -0,0 +1,132 @@
+/*
+ * 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;
+
+/**
+ * Instruction which has a single branch target.
+ */
+public final class TargetInsn extends FixedSizeInsn {
+    /** {@code non-null;} the branch target */
+    private CodeAddress target;
+
+    /**
+     * Constructs an instance. The output address of this instance is initially
+     * unknown ({@code -1}), and the target is initially
+     * {@code null}.
+     *
+     * @param opcode the opcode; one of the constants from {@link Dops}
+     * @param position {@code non-null;} source position
+     * @param registers {@code non-null;} register list, including a
+     * result register if appropriate (that is, registers may be either
+     * ins or outs)
+     * @param target {@code non-null;} the branch target
+     */
+    public TargetInsn(Dop opcode, SourcePosition position,
+                      RegisterSpecList registers, CodeAddress target) {
+        super(opcode, position, registers);
+
+        if (target == null) {
+            throw new NullPointerException("target == null");
+        }
+
+        this.target = target;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public DalvInsn withOpcode(Dop opcode) {
+        return new TargetInsn(opcode, getPosition(), getRegisters(), target);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public DalvInsn withRegisters(RegisterSpecList registers) {
+        return new TargetInsn(getOpcode(), getPosition(), registers, target);
+    }
+
+    /**
+     * Returns an instance that is just like this one, except that its
+     * opcode has the opposite sense (as a test; e.g. a
+     * {@code lt} test becomes a {@code ge}), and its branch
+     * target is replaced by the one given, and all set-once values
+     * associated with the class (such as its address) are reset.
+     *
+     * @param target {@code non-null;} the new branch target
+     * @return {@code non-null;} an appropriately-constructed instance
+     */
+    public TargetInsn withNewTargetAndReversed(CodeAddress target) {
+        Dop opcode = getOpcode().getOppositeTest();
+
+        return new TargetInsn(opcode, getPosition(), getRegisters(), target);
+    }
+
+    /**
+     * Gets the unique branch target of this instruction.
+     *
+     * @return {@code non-null;} the branch target
+     */
+    public CodeAddress getTarget() {
+        return target;
+    }
+
+    /**
+     * Gets the target address of this instruction. This is only valid
+     * to call if the target instruction has been assigned an address,
+     * and it is merely a convenient shorthand for
+     * {@code getTarget().getAddress()}.
+     *
+     * @return {@code >= 0;} the target address
+     */
+    public int getTargetAddress() {
+        return target.getAddress();
+    }
+
+    /**
+     * Gets the branch offset of this instruction. This is only valid to
+     * call if both this and the target instruction each has been assigned
+     * an address, and it is merely a convenient shorthand for
+     * {@code getTargetAddress() - getAddress()}.
+     *
+     * @return the branch offset
+     */
+    public int getTargetOffset() {
+        return target.getAddress() - getAddress();
+    }
+
+    /**
+     * Returns whether the target offset is known.
+     *
+     * @return {@code true} if the target offset is known or
+     * {@code false} if not
+     */
+    public boolean hasTargetOffset() {
+        return hasAddress() && target.hasAddress();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected String argString() {
+        if (target == null) {
+            return "????";
+        }
+
+        return target.identifierString();
+    }
+}