mirror_edk2/BaseTools/Source/Python
Derek Lin c17956e0ee BaseTools: Skip module AutoGen by comparing timestamp.
[Introduction]

The BaseTool Build.py AutoGen parse INF meta-file and generate
AutoGen.c/AutoGen.h/makefile. When we only change .c .h code, the
AutoGen might be not necessary, but Build.py spend a lot of time on it.
There's a -u flag to skip all module's AutoGen. In my environment, it save
35%~50% of time in rebuild a ROM.
However, if user change one .INF meta-file, then -u flag is not available.

[Idea]

AutoGen can compare meta-file's timestamp and decide if the module's
AutoGen can be skipped. With this, when a module's INF is changed, we
only run this module's AutoGen, we don't need to run other module's.

[Implementation]

In the end of a module's AutoGen, we create a AutoGenTimeStamp.
The file save a file list that related to this module's AutoGen.
In other word, the file list in AutoGenTimeStamp is INPUT files of
module AutoGen, AutoGenTimeStamp file is OUTPUT.
During rebuild, we compare time stamp between INPUT and OUTPUT, and
decide if we can skip it.

Below is the Input/Output of a module's AutoGen.

[Input]
  1. All the DSC/DEC/FDF used by the platform.
  2. Macro and PCD defined by Build Options such as "build -D AAA=TRUE
     --pcd BbbPcd=0".
  3. INF file of a module.
  4. Source files of a module, list in [Sources] section of INF.
  5. All the library link by the module.
  6. All the .h files included by the module's sources.

[Output]
  AutoGen.c/AutoGen.h/makefile/AutoGenTimeStamp

[Testing]

This patch save my build time. When I make a change without touching
DSC/DEC/FDF, it is absolutely much faster than original rebuild,
35%~50% time saving in my environment
(compare to original tool rebuild time).
If I change any DSC/DEC/FDF, there's no performance improve, because it
can't skip any module's AutoGen.

Please note that if your environment will generate DSC/FDF during prebuild,
it will not skip any AutoGen because of DSC timestamp is changed. This will
require prebuild script not to update metafile when content is not changed.
2017-03-25 12:13:01 +08:00
..
AutoGen BaseTools: Skip module AutoGen by comparing timestamp. 2017-03-25 12:13:01 +08:00
BPDG BaseTools/BPDG: Fix the bug to get the PCD Size 2016-03-14 11:33:12 +08:00
build BaseTools: fix the bug for Mixed Pcd display in the report 2017-01-04 16:49:04 +08:00
Common BaseTools: Enhance BaseTools supports FixedAtBuild usage in VFR file 2017-02-14 09:02:49 +08:00
CommonDataClass BaseTools: Add support to merge Prebuild and Postbuild into build Process 2016-04-07 13:13:22 +08:00
Ecc BaseTools/ECC: Fix an issue of parameter parser 2017-03-09 15:04:33 +08:00
Eot There is a limitation on WINDOWS OS for the length of entire file path can’t be larger than 255. There is an OS API provided by Microsoft to add “\\?\” before the path header to support the long file path. Enable this feature on basetools. 2014-08-15 03:06:48 +00:00
GenFds BaseTools: Skip module AutoGen by comparing timestamp. 2017-03-25 12:13:01 +08:00
GenPatchPcdTable BaseTools: Fix the bug to parse the new map file format 2016-12-02 11:01:24 +08:00
PatchPcdValue BaseTools: Clean some coding style issues 2015-12-01 04:22:16 +00:00
Pkcs7Sign BaseTools: Update some tool with shell=True 2017-03-18 16:38:04 +08:00
Rsa2048Sha256Sign BaseTools: Update some tool with shell=True 2017-03-18 16:38:04 +08:00
Table BaseTools: Clean some coding style issues 2015-12-01 04:22:16 +00:00
TargetTool License header updated to match correct format. 2014-08-28 13:53:34 +00:00
Trim BaseTools: update the mail address for stack trace info 2016-03-11 12:29:59 +08:00
UPT BaseTools/UPT: Fix an issue in subst command 2017-03-14 17:29:24 +08:00
Workspace BaseTools: Skip module AutoGen by comparing timestamp. 2017-03-25 12:13:01 +08:00
GNUmakefile Sync BaseTool trunk (version r2599) into EDKII BaseTools. 2013-08-23 02:18:16 +00:00
Makefile BaseTools: List missing source python files for Ecc tool in Makefile 2016-09-27 16:26:13 +08:00
sitecustomize.py License header updated to match correct format. 2014-08-28 13:53:34 +00:00