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, 7 insertions, 1 deletions

diff --git a/vm/compiler/codegen/CompilerCodegen.h b/vm/compiler/codegen/CompilerCodegen.h
index 75307a766..3e9718c6d 100644
--- a/vm/compiler/codegen/CompilerCodegen.h
+++ b/vm/compiler/codegen/CompilerCodegen.h
@@ -46,6 +46,12 @@ void dvmCompilerRegAlloc(CompilationUnit *cUnit);
 void dvmCompilerInitializeRegAlloc(CompilationUnit *cUnit);
 
 /* Implemented in codegen/<target>/<target_variant>/ArchVariant.c */
-JitInstructionSetType dvmCompilerInstructionSet(CompilationUnit *cUnit);
+JitInstructionSetType dvmCompilerInstructionSet(void);
+
+/*
+ * Implemented in codegen/<target>/<target_variant>/ArchVariant.c
+ * Architecture-specific initializations and checks
+ */
+bool dvmCompilerArchVariantInit(void);
 
 #endif /* _DALVIK_VM_COMPILERCODEGEN_H_ */