1 files changed, 58 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/ssa/back/NullRegisterAllocator.java b/dx/src/com/android/dx/ssa/back/NullRegisterAllocator.java
new file mode 100644
index 0000000..0205c11
--- /dev/null
+++ b/dx/src/com/android/dx/ssa/back/NullRegisterAllocator.java
@@ -0,0 +1,58 @@
+/*
+ * 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.ssa.back;
+
+import com.android.dx.ssa.BasicRegisterMapper;
+import com.android.dx.ssa.RegisterMapper;
+import com.android.dx.ssa.SsaMethod;
+
+import java.util.BitSet;
+import java.util.ArrayList;
+
+/**
+ * A register allocator that maps SSA register n to Rop register 2*n,
+ * essentially preserving the original mapping and remaining agnostic
+ * about normal or wide categories. Used for debugging.
+ */
+public class NullRegisterAllocator extends RegisterAllocator {
+    /** {@inheritDoc} */
+    public NullRegisterAllocator(SsaMethod ssaMeth,
+            InterferenceGraph interference) {
+        super(ssaMeth, interference);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean wantsParamsMovedHigh() {
+        // We're not smart enough for this.
+        return false;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public RegisterMapper allocateRegisters() {
+        int oldRegCount = ssaMeth.getRegCount();
+
+        BasicRegisterMapper mapper = new BasicRegisterMapper(oldRegCount);
+
+        for (int i = 0; i < oldRegCount; i++) {
+            mapper.addMapping(i, i*2, 2);
+        }
+
+        return mapper;
+    }
+}