| The codegen file for the ARM-based JIT is composed by files broken by |
| functionality hierarchies. The goal is to separate architectural dependent |
| and independent components to facilitate maintenance and future extension. |
| |
| For example, the codegen file for armv7-a is assembled by the following |
| components: |
| |
| -- |
| |
| /* Architectural independent building blocks */ |
| #include "../CodegenCommon.cpp" |
| |
| /* Thumb2-specific factory utilities */ |
| #include "../Thumb2/Factory.cpp" |
| /* Factory utilities dependent on arch-specific features */ |
| #include "../CodegenFactory.cpp" |
| |
| /* Thumb2-specific codegen routines */ |
| #include "../Thumb2/Gen.cpp" |
| /* Thumb2+VFP codegen routines */ |
| #include "../FP/Thumb2VFP.cpp" |
| |
| /* Thumb2-specific register allocation */ |
| #include "../Thumb2/Ralloc.cpp" |
| |
| /* MIR2LIR dispatcher and architectural independent codegen routines */ |
| #include "../CodegenDriver.cpp" |
| |
| /* Architecture manifest */ |
| #include "ArchVariant.cpp" |
| |
| -- |
| |
| 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 |
| |
| In this way the dependency between generic and specific code tied to |
| particular architectures can be explicitly represented. |
