[asan] helper script to dump/merge coverage data

llvm-svn: 194809

compiler-rt/lib/sanitizer_common/scripts/sancov.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+# Merge or print the coverage data collected by asan's coverage.
+# Input files are sequences of 4-byte integers.
+# We need to merge these integers into a set and then
+# either print them (as hex) or dump them into another file.
+import array
+import sys
+
+prog_name = "";
+
+def Usage():
+  print >> sys.stderr, "Usage: \n" + \
+      " " + prog_name + " merge file1 [file2 ...]  > output\n" \
+      " " + prog_name + " print file1 [file2 ...]\n"
+  exit(1)
+
+def ReadOneFile(path):
+  f = open(path, mode="rb")
+  f.seek(0, 2)
+  size = f.tell()
+  f.seek(0, 0)
+  s = set(array.array('I', f.read(size)))
+  f.close()
+  print >>sys.stderr, "%s: read %d PCs from %s" % (prog_name, size / 4, path)
+  return s
+
+def Merge(files):
+  s = set()
+  for f in files:
+    s = s.union(ReadOneFile(f))
+  print >> sys.stderr, "%s: %d files merged; %d PCs total" % \
+    (prog_name, len(files), len(s))
+  return sorted(s)
+
+def PrintFiles(files):
+  s = Merge(files)
+  for i in s:
+    print "0x%x" % i
+
+def MergeAndPrint(files):
+  if sys.stdout.isatty():
+    Usage()
+  s = Merge(files)
+  a = array.array('I', s)
+  a.tofile(sys.stdout)
+
+if __name__ == '__main__':
+  prog_name = sys.argv[0]
+  if len(sys.argv) <= 2:
+    Usage();
+  if sys.argv[1] == "print":
+    PrintFiles(sys.argv[2:])
+  elif sys.argv[1] == "merge":
+    MergeAndPrint(sys.argv[2:])
+  else:
+    Usage()