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#!/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 struct
import sys
prog_name = "";
def Usage():
print >> sys.stderr, "Usage: \n" + \
" " + prog_name + " merge file1 [file2 ...] > output\n" \
" " + prog_name + " print file1 [file2 ...]\n" \
" " + prog_name + " unpack file1 [file2 ...]\n"
exit(1)
def ReadOneFile(path):
with open(path, mode="rb") as f:
f.seek(0, 2)
size = f.tell()
f.seek(0, 0)
s = set(array.array('I', f.read(size)))
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)
def UnpackOneFile(path):
with open(path, mode="rb") as f:
print >> sys.stderr, "%s: unpacking %s" % (prog_name, path)
while True:
header = f.read(12)
if not header: return
if len(header) < 12:
break
pid, module_length, blob_size = struct.unpack('iII', header)
module = f.read(module_length)
blob = f.read(blob_size)
assert(len(module) == module_length)
assert(len(blob) == blob_size)
extracted_file = "%s.%d.sancov" % (module, pid)
print >> sys.stderr, "%s: extracting %s" % \
(prog_name, extracted_file)
# The packed file may contain multiple blobs for the same pid/module
# pair. Append to the end of the file instead of overwriting.
with open(extracted_file, 'ab') as f2:
f2.write(blob)
# fail
raise Exception('Error reading file %s' % path)
def Unpack(files):
for f in files:
UnpackOneFile(f)
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:])
elif sys.argv[1] == "unpack":
Unpack(sys.argv[2:])
else:
Usage()
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