Add support for armembers data source for Mach-O archives #486
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Implements the 'archs' data source to break down universal binaries by architecture. This allows users to: - View file size breakdown by architecture: bloaty -d archs - Filter to specific architecture: bloaty -d archs,segments --source-filter=arm64 - Hierarchical breakdown: bloaty -d archs,segments
Note, for archives containing universal binaries, --domain=vm does not currently produce meaningful results because each architecture has its own independent address space, causing address collisions when combined. Use --domain=file instead, for filter to a single architecture with --source-filter=<arch>. Fixes google#153 Fixes google#293
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This patch adds support for Darwin/Mach-O archives.
Also, note this PR contains 175026f which has its own PR here: #481 but I'm including it here as it is a dependency and annoying to stack patches. Ideally I can rebase if/when it lands.
Note, for archives containing universal binaries, --domain=vm does not currently produce meaningful results because each architecture has its own independent address space, causing address collisions when combined. So a user should use --domain=file or filter to a single architecture with --source-filter=. This can be addressed if each slice gets it's own vm address space, e.g. using #480