PGO: Statically generate data structures

Description

PGO: Statically generate data structures

In instrumentation-based profiling, we need a set of data structures to
represent the counters. Previously, these were built up during static
initialization. Now, they're shoved into a specially-named section so
that they show up as an array.

As a consequence of the reorganizing symbols, instrumentation data
structures for linkonce functions are now correctly coalesced.

This is the first step in a larger project to minimize runtime overhead
and dependencies in instrumentation-based profilng. The larger picture
includes removing all initialization overhead and making the dependency
on libc optional.

rdar://problem/15943240

Details

Committed
dexonsmithMar 17 2014, 2:18 PM
Parents
rL204079: PGO: Statically generate data structures
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