[llvm] r176605 - Debug Info: store the files and directories for each compile unit.

[Eric Christopher]

On Wed, Mar 6, 2013 at 5:42 PM, Manman Ren <mren at apple.com> wrote:

> Author: mren
> Date: Wed Mar  6 19:42:00 2013
> New Revision: 176605
>
> URL: http://llvm.org/viewvc/llvm-project?rev=176605&view=rev
> Log:
> Debug Info: store the files and directories for each compile unit.
>
> We now emit a line table for each compile unit. To reduce the prologue size
> of each line table, the files and directories used by each compile unit are
> stored in std::map<unsigned, std::vector< > > instead of std::vector< >.
>
> The prologue for a lto'ed image can be as big as 93K. Duplicating 93K for
> each
> compile unit causes a huge increase of debug info. With this patch, each
> prologue will only emit the files required by the compile unit.
>

Looks good. Any reason not to use SmallVector instead?

-eric
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