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#!/usr/bin/python
import json
import re
import subprocess
import sys
def count_ctors(filename):
proc = subprocess.Popen(
['readelf', '-W', '-S', filename], stdout=subprocess.PIPE)
# Some versions of ld produce both .init_array and .ctors. So we have
# to check for both.
n_init_array_ctors = 0
have_init_array = False
n_ctors_ctors = 0
have_ctors = False
for line in proc.stdout:
f = line.split()
if len(f) != 11:
continue
# Don't try to int()-parse the header line for the section summaries.
if not re.match("\\[\\d+\\]", f[0]):
continue
section_name, contents, size, align = f[1], f[2], int(f[5], 16), int(f[10])
if section_name == ".ctors" and contents == "PROGBITS":
have_ctors = True
# Subtract 2 for the uintptr_t(-1) header and the null terminator.
n_ctors_ctors = size / align - 2
if section_name == ".init_array" and contents == "INIT_ARRAY":
have_init_array = True
n_init_array_ctors = size / align
if have_init_array:
# Even if we have .ctors, we shouldn't have any constructors in .ctors.
# Complain if .ctors does not look how we expect it to.
if have_ctors and n_ctors_ctors != 0:
print >>sys.stderr, "Unexpected .ctors contents for", filename
sys.exit(1)
return n_init_array_ctors
if have_ctors:
return n_ctors_ctors
# We didn't find anything; somebody switched initialization mechanisms on
# us, or the binary is completely busted. Complain either way.
print >>sys.stderr, "Couldn't find .init_array or .ctors in", filename
sys.exit(1)
if __name__ == '__main__':
for f in sys.argv[1:]:
perfherder_data = {
"framework": {"name": "build_metrics"},
"suites": [{
"name": "compiler_metrics",
"subtests": [{
"name": "num_constructors",
"value": count_ctors(f),
"alertThreshold": 0.25
}]}
]
}
print "PERFHERDER_DATA: %s" % json.dumps(perfherder_data)
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