| #!/usr/bin/python |
| import subprocess |
| import re |
| 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:]: |
| print "%s\t%s" % (count_ctors(f), f) |
