Restructure the codegen to make architectural depedency explicit.

The original Codegen.c is broken into three components:

- CodegenCommon.c (arch-independend)
- CodegenFactory.c (Thumb1/2 dependent)
- CodegenDriver.c (Dalvik dependent)

For the Thumb/Thumb2 directories, each contain the followin three files:

- Factory.c (low-level routines for instruction selections)
- Gen.c     (invoke the ISA-specific instruction selection routines)
- Ralloc.c  (arch-dependent register pools)

The FP directory contains FP-specific codegen routines depending on
Thumb/Thumb2/VFP/PortableFP:

- Thumb2VFP.c
- ThumbVFP.c
- ThumbPortableFP.c

Then the hierarchy is formed by stacking these files in the following top-down
order:

1 CodegenCommon.c
2 Thumb[2]/Factory.c
3 CodegenFactory.c
4 Thumb[2]/Gen.c
5 FP stuff
6 Thumb[2]/Ralloc.c
7 CodegenDriver.c

1 files changed, 44 insertions, 0 deletions

diff --git a/vm/compiler/codegen/arm/Thumb/Ralloc.c b/vm/compiler/codegen/arm/Thumb/Ralloc.c
new file mode 100644
index 000000000..e9dd9a57a
--- /dev/null
+++ b/vm/compiler/codegen/arm/Thumb/Ralloc.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2009 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.
+ */
+
+/*
+ * This file contains codegen for the Thumb ISA and is intended to be
+ * includes by:
+ *
+ *        Codegen-$(TARGET_ARCH_VARIANT).c
+ *
+ */
+
+/*
+ * Alloc a pair of core registers, or a double.  Low reg in low byte,
+ * high reg in next byte.
+ */
+int dvmCompilerAllocTypedTempPair(CompilationUnit *cUnit, bool fpHint,
+                                  int regClass)
+{
+    int highReg;
+    int lowReg;
+    int res = 0;
+    lowReg = allocTemp(cUnit);
+    highReg = allocTemp(cUnit);
+    res = (lowReg & 0xff) | ((highReg & 0xff) << 8);
+    return res;
+}
+
+int dvmCompilerAllocTypedTemp(CompilationUnit *cUnit, bool fpHint, int regClass)
+{
+    return allocTemp(cUnit);
+}