Commit Graph

59 Commits

Author SHA1 Message Date
Duncan P. N. Exon Smith 812dcae09c InstrProf: Unify logic in two profile writers
<rdar://problem/15943240>

llvm-svn: 204500
2014-03-21 18:29:24 +00:00
Duncan P. N. Exon Smith cf4bb960bd InstrProf: If libc is available, use it; no functionality change
It was misguided to plan to rely on __llvm_profile_write_buffer() in
__llvm_profile_write_file().  It's less complex to duplicate the writing
logic than to mmap the file.

Since it's here to stay, move `FILE*`-based writing logic into
InstrProfilingFile.c.

<rdar://problem/15943240>

llvm-svn: 204498
2014-03-21 18:29:19 +00:00
Duncan P. N. Exon Smith be0a5e176b InstrProf: Reorganize files; no functionality change
Move functions around to prepare for some other changes.

  - Merge InstrProfilingExtras.h with InstrProfiling.h.  There's no
    benefit to having these split.

  - Rename InstrProfilingExtras.c to InstrProfilingFile.c.

  - Split actual buffer writing code out of InstrProfiling.c into
    InstrProfilingBuffer.c.

  - Drive-by corrections of a couple of header comments.

<rdar://problem/15943240>

llvm-svn: 204497
2014-03-21 18:29:15 +00:00
Duncan P. N. Exon Smith 4543aac96e PGO: Indicate errors in profile runtime API
Return 0 for success, non-0 for failure.

llvm-svn: 204415
2014-03-21 00:27:50 +00:00
Duncan P. N. Exon Smith 71704754d6 PGO: Declare zero-argument C functions as foo(void)
It turns out this is C code.  Specify foo(void).

<rdar://problem/15943240>

llvm-svn: 204396
2014-03-20 20:55:00 +00:00
Duncan P. N. Exon Smith 9edbae0f16 PGO: Change runtime prefix from pgo to profile
These functions are in the profile runtime.  PGO comes later.

Unfortunately, there's only room for 16 characters in a Darwin section,
so use __llvm_prf_ instead of __llvm_profile_ for section names.

<rdar://problem/15943240>

llvm-svn: 204391
2014-03-20 20:00:44 +00:00
Duncan P. N. Exon Smith f1212176ac PGO: Add function to reset counters at runtime
Adding __llvm_pgo_reset_counters(), which sets all the counters to 0.

<rdar://problem/15943240>

llvm-svn: 204386
2014-03-20 19:44:31 +00:00
Duncan P. N. Exon Smith da0de8a237 PGO: Split out initialization of section bounds
Currently we register instrumentation data at runtime to determine the
bounds of the sections where the data lives.  Soon we'll implement
platform-specific linker magic to determine this at link time.

Move this logic to a separate file, so that our build system can choose
the correct platform-specific code.

No functionality change intended.

<rdar://problem/15943240>

llvm-svn: 204299
2014-03-20 03:23:10 +00:00
Duncan P. N. Exon Smith 8353a26e85 PGO: Splitting implementation files; no functionality change
Split implementation files along a uses-libc/shouldn't-use-libc
boundary.

  - InstrProfiling.h is a shared header.

  - InstrProfiling.c provides an API to extract profiling data from the
    runtime, but avoids the use of libc.  Currently this is a lie:
    __llvm_pgo_write_buffer() uses `FILE*` and related functions.  It
    will be updated soon to write to a `char*` buffer instead.

  - InstrProfilingExtras.c provides a more convenient API for
    interfacing with the profiling runtime, but has logic that does (and
    will continue to) use libc.

<rdar://problem/15943240>

llvm-svn: 204268
2014-03-19 22:10:27 +00:00