Commit Graph

3 Commits

Author SHA1 Message Date
Duncan P. N. Exon Smith 775c178a90 PGO: Add explicit static initialization
Instead of relying on explicit static initialization from translation
units, create a new file, InstrProfilingRuntime.cc, with an
__llvm_pgo_runtime variable.  After this commit (and its pair in clang),
the driver will create a use of this variable.  Unless the user defines
their own version, the new object file will get pulled in, including
that C++ static initialization that calls
__llvm_pgo_register_write_atexit.

The result is that, at least on Darwin, static initialization typically
consists of a single function call, which registers a writeout functino
atexit.  Furthermore, users can skip even this behaviour by defining
their own __llvm_pgo_runtime.

<rdar://problem/15943240>

llvm-svn: 204380
2014-03-20 19:23:53 +00:00
Daniel Dunbar 2003d39f7c build: Add ModuleName per-subdir variable as a way to organize the different
sets of functions/objects into high level groups. Currently we have "builtins"
(the main compiler-rt code), "profile", and "asan".
 - Use this to define CommonFunctions and ArchFunctions to only reference the
   builtins functions.

llvm-svn: 145674
2011-12-02 02:42:07 +00:00
Daniel Dunbar fb16114782 lib: Import GCDA profiling support from LLVM.
- I'm in the process of moving this here but it will live in both places until
   the ancilliary support is ready.
 - Currently unused.

llvm-svn: 144865
2011-11-17 00:12:10 +00:00