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dwarf-assembly
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Add .rodata to compare-sizes

This commit is contained in:
Théophile Bastian 2018-05-15 16:14:17 +02:00
parent 49cd75b7b7
commit ee6e534fc9
1 changed files with 43 additions and 17 deletions
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60
compare_sizes.py
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@ -29,8 +29,8 @@ def format_size(size):
return '{:.1f} {}'.format(size, units[cur_unit])
def section_size(elf_loc, section_name):
''' Find the size of a given section in some elf file '''
def invoke_objdump_headers(elf_loc):
''' Call objdump -h, returning the list of lines outputted '''
if not os.path.isfile(elf_loc):
raise FileNotFoundError
@ -39,21 +39,29 @@ def section_size(elf_loc, section_name):
objdump_out = subprocess.check_output(['objdump', '-h', elf_loc]) \
.decode('utf-8')
except subprocess.CalledProcessError as exn:
raise Exception(("Cannot obtain section {} size for {}: objdump "
raise Exception(("Cannot run objdump on {}: objdump "
"terminated with exit code {}.").format(
section_name, elf_loc, exn.returncode))
elf_loc, exn.returncode))
for line in objdump_out.split('\n'):
return objdump_out.split('\n')
def get_elf_sections(elf_loc):
''' List the ELF sections of the given ELF '''
sections = {}
for line in invoke_objdump_headers(elf_loc):
line = line.strip()
if not line or not '0' <= line[0] <= '9': # not a section line
continue
spl = line.split()
if spl[1] != section_name:
continue
sections[spl[1]] = {
'name': spl[1],
'size': int(spl[2], 0x10),
}
return int(spl[2], 0x10)
raise Exception("No such section {} in {}".format(section_name, elf_loc))
return sections
def matching_eh_elf(eh_locs, elf_name):
@ -114,12 +122,11 @@ def main():
args = process_args()
objs = objects_list(args)
section_size(objs[0].elf, '.eh_frame')
col_names = [
'Shared object',
'Orig eh_frame',
'Gen eh_elf',
'Gen eh_elf .text',
'+ .rodata',
'Growth',
]
@ -128,45 +135,64 @@ def main():
displayed_name_filter = lambda x: os.path.basename(x.elf)
max_elf_name = max(map(lambda x: len(displayed_name_filter(x)), objs))
col_len.append(max(max_elf_name, len(col_names[0])))
for i in range(1, 4):
for i in range(1, len(col_names)):
col_len.append(len(col_names[i]) + 1)
col_len = list(map(str, col_len))
header_format = ('{:<' + col_len[0] + '} '
'{:<' + col_len[1] + '} '
'{:<' + col_len[2] + '} '
'{:<' + col_len[3] + '}')
'{:<' + col_len[3] + '} '
'{:<' + col_len[4] + '}')
row_format = ('{:>' + col_len[0] + '} '
'{:>' + col_len[1] + '} '
'{:>' + col_len[2] + '} '
'{:>' + col_len[3] + '}')
'{:>' + col_len[3] + '} '
'{:>' + col_len[4] + '}')
print(header_format.format(
col_names[0],
col_names[1],
col_names[2],
col_names[3],
col_names[4],
))
total_eh_frame_size = 0
total_eh_elf_text_size = 0
total_eh_elf_size = 0
for obj in objs:
eh_frame_size = section_size(obj.elf, '.eh_frame')
eh_elf_size = section_size(obj.eh_elf, '.text')
elf_sections = get_elf_sections(obj.elf)
eh_elf_sections = get_elf_sections(obj.eh_elf)
eh_frame_size = elf_sections['.eh_frame']['size']
eh_elf_text_size = eh_elf_sections['.text']['size']
eh_elf_size = eh_elf_text_size + eh_elf_sections['.rodata']['size']
total_eh_frame_size += eh_frame_size
total_eh_elf_text_size += eh_elf_text_size
total_eh_elf_size += eh_elf_size
print(row_format.format(
displayed_name_filter(obj),
format_size(eh_frame_size),
format_size(eh_elf_text_size),
format_size(eh_elf_size),
'{:.2f}'.format(eh_elf_size / eh_frame_size)))
# Checking for missed big sections
for section in eh_elf_sections:
if section == '.text' or section == '.rodata':
continue
if eh_elf_sections[section]['size'] > eh_elf_size / 2:
print("\t\t/!\\ Section {} is big ({}) in the eh_elf".format(
section, format_size(eh_elf_sections[section]['size'])))
print(row_format.format(
'Total',
format_size(total_eh_frame_size),
format_size(total_eh_elf_size),
format_size(total_eh_elf_text_size),
'{:.2f}'.format(total_eh_elf_size / total_eh_frame_size)))