| Ben Cheng | 5d90c20 | 2009-11-22 23:31:11 -0800 | [diff] [blame] | 1 | The codegen file for the ARM-based JIT is composed by files broken by |
| 2 | functionality hierarchies. The goal is to separate architectural dependent |
| 3 | and independent components to facilitate maintenance and future extension. |
| 4 | |
| 5 | For example, the codegen file for armv7-a is assembled by the following |
| 6 | components: |
| 7 | |
| 8 | -- |
| 9 | |
| 10 | /* Architectural independent building blocks */ |
| 11 | #include "../CodegenCommon.c" |
| 12 | |
| 13 | /* Thumb2-specific factory utilities */ |
| 14 | #include "../Thumb2/Factory.c" |
| 15 | /* Factory utilities dependent on arch-specific features */ |
| 16 | #include "../CodegenFactory.c" |
| 17 | |
| 18 | /* Thumb2-specific codegen routines */ |
| 19 | #include "../Thumb2/Gen.c" |
| 20 | /* Thumb2+VFP codegen routines */ |
| 21 | #include "../FP/Thumb2VFP.c" |
| 22 | |
| 23 | /* Thumb2-specific register allocation */ |
| 24 | #include "../Thumb2/Ralloc.c" |
| 25 | |
| 26 | /* MIR2LIR dispatcher and architectural independent codegen routines */ |
| 27 | #include "../CodegenDriver.c" |
| 28 | |
| 29 | /* Architecture manifest */ |
| 30 | #include "ArchVariant.c" |
| 31 | |
| 32 | -- |
| 33 | |
| 34 | For the Thumb/Thumb2 directories, each contain the followin three files: |
| 35 | |
| 36 | - Factory.c (low-level routines for instruction selections) |
| 37 | - Gen.c (invoke the ISA-specific instruction selection routines) |
| 38 | - Ralloc.c (arch-dependent register pools) |
| 39 | |
| 40 | The FP directory contains FP-specific codegen routines depending on |
| 41 | Thumb/Thumb2/VFP/PortableFP: |
| 42 | |
| 43 | - Thumb2VFP.c |
| 44 | - ThumbVFP.c |
| 45 | - ThumbPortableFP.c |
| 46 | |
| 47 | In this way the dependency between generic and specific code tied to |
| 48 | particular architectures can be explicitly represented. |