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| author | Eric Christopher <echristo@gmail.com> | 2017-01-04 02:34:29 +0000 |
|---|---|---|
| committer | Eric Christopher <echristo@gmail.com> | 2017-01-04 02:34:29 +0000 |
| commit | 46b6597296a3b662ec6d9d575390cf8f7525b3bc (patch) | |
| tree | 2fe2ff94adf45a55f84650fd5377107ea8fa4836 /lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp | |
| parent | ea64969763a5a9f9c6e381e3494e2b7b16ae82b1 (diff) | |
On a 64-bit system, the DWARFDebugLine::Row struct is 32 bytes. Each field has the following byte offsets:
0-7: Address
8-11: Line
12-13: Column
14-15: File
16-19: Isa
20-23: Discriminator
24+: bit fields
The packing is fine until the "Isa" field, which is an 8-bit int that occupies 4 bytes. We can instead move Discriminator into the 16-19 slot, and pack Isa into the 20-23 range along with the bit fields:
0-7: Address
8-11: Line
12-13: Column
14-15: File
16-19: Discriminator
20-23: Isa + bit fields
This layout is only 24 bytes. This 25% reduction in size may seem small but a large binary can have line tables with thousands of rows stored in a vector.
Patch by Simon Que!
Differential Revision: https://reviews.llvm.org/D27961
llvm-svn: 290931
Diffstat (limited to 'lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp')
0 files changed, 0 insertions, 0 deletions