| commit | 802e9759cdd1919e4ec0e655d4ad25d52f6ed6a1 | [log] [tgz] |
|---|---|---|
| author | Colin Cross <ccross@android.com> | Wed May 13 18:59:07 2015 -0700 |
| committer | Colin Cross <ccross@android.com> | Thu May 14 15:55:10 2015 -0700 |
| tree | 81ef8ab03b11625d358109fce28f654fad93423a | |
| parent | 36bb07cf3cb6563a5f3b6afeddb0e811444470df [diff] |
Add proptools.CloneEmptyProperties Modules that want properties that vary by variant often need to create zeroed copies of property structs. Add CloneEmptyProperties to proptools that is the equivalent of calling CloneProperties and then ZeroProperties, but is much faster because it directly creates zeroed objects. Saves 200ms in Context.ParseBlueprintsFiles and Context.ResolveDependencies in one case, which will be valuble when we start parsing Blueprints files for cases where we are not regenerating the manifest, for example when generating documentation or doing context-aware bpfmt. Change-Id: I3d4a6af2f393886d95f27d15afc1a455d8dd5fc6
Blueprint is a meta-build system that reads in Blueprints files that describe modules that need to be built, and produces a Ninja manifest describing the commands that need to be run and their dependencies. Where most build systems use built-in rules or a domain-specific language to describe the logic for converting module descriptions to build rules, Blueprint delegates this to per-project build logic written in Go. For large, heterogenous projects this allows the inherent complexity of the build logic to be maintained in a high-level language, while still allowing simple changes to individual modules by modifying easy to understand Blueprints files.