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#!/usr/bin/python
# Copyright (c) 2016, Google Inc.
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import os
import os.path
import subprocess
import sys
# The LCOV output format for each source file is:
#
# SF:<filename>
# DA:<line>,<execution count>
# ...
# end_of_record
#
# The <execution count> can either be 0 for an unexecuted instruction or a
# value representing the number of executions. The DA line should be omitted
# for lines not representing an instruction.
SECTION_SEPERATOR = '-' * 80
def is_asm(l):
"""Returns whether a line should be considered to be an instruction."""
l = l.strip()
# Empty lines
if l == '':
return False
# Comments
if l.startswith('#'):
return False
# Assembly Macros
if l.startswith('.'):
return False
# Label
if l.endswith(':'):
return False
return True
def merge(callgrind_files, srcs):
"""Calls callgrind_annotate over the set of callgrind output
|callgrind_files| using the sources |srcs| and merges the results
together."""
out = ''
for file in callgrind_files:
data = subprocess.check_output(['callgrind_annotate', file] + srcs)
out += '%s\n%s\n' % (data, SECTION_SEPERATOR)
return out
def parse(filename, data, current):
"""Parses an annotated execution flow |data| from callgrind_annotate for
source |filename| and updates the current execution counts from |current|."""
with open(filename) as f:
source = f.read().split('\n')
out = current
if out == None:
out = [0 if is_asm(l) else None for l in source]
# Lines are of the following formats:
# -- line: Indicates that analysis continues from a different place.
# Ir : Indicates the start of a file.
# => : Indicates a call/jump in the control flow.
# <Count> <Code>: Indicates that the line has been executed that many times.
line = None
for l in data:
l = l.strip() + ' '
if l.startswith('-- line'):
line = int(l.split(' ')[2]) - 1
elif l.strip() == 'Ir':
line = 0
elif line != None and l.strip() and '=>' not in l and 'unidentified lines' not in l:
count = l.split(' ')[0].replace(',', '').replace('.', '0')
instruction = l.split(' ', 1)[1].strip()
if count != '0' or is_asm(instruction):
if out[line] == None:
out[line] = 0
out[line] += int(count)
line += 1
return out
def generate(data):
"""Parses the merged callgrind_annotate output |data| and generates execution
counts for all annotated files."""
out = {}
data = [p.strip() for p in data.split(SECTION_SEPERATOR)]
# Most sections are ignored, but a section with:
# User-annotated source: <file>
# precedes a listing of execution count for that <file>.
for i in range(len(data)):
if 'User-annotated source' in data[i] and i < len(data) - 1:
filename = data[i].split(':', 1)[1].strip()
res = data[i + 1]
if filename not in out:
out[filename] = None
if 'No information' in res:
res = []
else:
res = res.split('\n')
out[filename] = parse(filename, res, out[filename])
return out
def output(data):
"""Takes a dictionary |data| of filenames and execution counts and generates
a LCOV coverage output."""
out = ''
for filename, counts in data.iteritems():
out += 'SF:%s\n' % (os.path.abspath(filename))
for line, count in enumerate(counts):
if count != None:
out += 'DA:%d,%s\n' % (line + 1, count)
out += 'end_of_record\n'
return out
if __name__ == '__main__':
if len(sys.argv) != 3:
print '%s <Callgrind Folder> <Build Folder>' % (__file__)
sys.exit()
cg_folder = sys.argv[1]
build_folder = sys.argv[2]
cg_files = []
for (cwd, _, files) in os.walk(cg_folder):
for f in files:
if f.startswith('callgrind.out'):
cg_files.append(os.path.abspath(os.path.join(cwd, f)))
srcs = []
for (cwd, _, files) in os.walk(build_folder):
for f in files:
fn = os.path.join(cwd, f)
if fn.endswith('.S'):
srcs.append(fn)
annotated = merge(cg_files, srcs)
lcov = generate(annotated)
print output(lcov)
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