bug 564851 - Add support for MSVC PGO. Patch by Tetsuro Kato <tete009+bugzilla@gmail.com>, r=wtcNSPR_HEAD_20110503

1 files changed, 40 insertions, 0 deletions

diff --git a/build/win32/pgomerge.py b/build/win32/pgomerge.py
new file mode 100644
index 00000000..383457bf
--- /dev/null
+++ b/build/win32/pgomerge.py
@@ -0,0 +1,40 @@
+#!/usr/bin/python
+# Usage: pgomerge.py <binary basename> <dist/bin>
+# Gathers .pgc files from dist/bin and merges them into
+# $PWD/$basename.pgd using pgomgr, then deletes them.
+# No errors if any of these files don't exist.
+
+import sys, os, os.path, subprocess
+if not sys.platform == "win32":
+    raise Exception("This script was only meant for Windows.")
+
+def MergePGOFiles(basename, pgddir, pgcdir):
+  """Merge pgc files produced from an instrumented binary
+     into the pgd file for the second pass of profile-guided optimization
+     with MSVC.  |basename| is the name of the DLL or EXE without the
+     extension.  |pgddir| is the path that contains <basename>.pgd
+     (should be the objdir it was built in).  |pgcdir| is the path
+     containing basename!N.pgc files, which is probably dist/bin.
+     Calls pgomgr to merge each pgc file into the pgd, then deletes
+     the pgc files."""
+  if not os.path.isdir(pgddir) or not os.path.isdir(pgcdir):
+    return
+  pgdfile = os.path.abspath(os.path.join(pgddir, basename + ".pgd"))
+  if not os.path.isfile(pgdfile):
+    return
+  for file in os.listdir(pgcdir):
+    if file.startswith(basename+"!") and file.endswith(".pgc"):
+      try:
+        pgcfile = os.path.normpath(os.path.join(pgcdir, file))
+        subprocess.call(['pgomgr', '-merge',
+                         pgcfile,
+                         pgdfile])
+        os.remove(pgcfile)
+      except OSError:
+        pass
+
+if __name__ == '__main__':
+  if len(sys.argv) != 3:
+      print >>sys.stderr, "Usage: pgomerge.py <binary basename> <dist/bin>"
+      sys.exit(1)
+  MergePGOFiles(sys.argv[1], os.getcwd(), sys.argv[2])