mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-27 21:33:09 +00:00
63 lines
2.1 KiB
Python
Executable file
63 lines
2.1 KiB
Python
Executable file
#!/usr/bin/env python3
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# Finds potential ODR violations due to weak symbols.
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# For example, if you have two different structs with the same name in different files,
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# their inline constructors may collide.
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# This works only on Linux. It is designed to be run from the cmake build directory.
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# clang seems more willing to emit non-inlined ctors. Of course perform a Debug build.
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import re
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import subprocess
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output = subprocess.check_output(
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"nm --radix=d -g --demangle -l --print-size CMakeFiles/fishlib.dir/src/*.o",
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shell=True,
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universal_newlines=True,
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)
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files_by_name = {} # Symbol to set of paths
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sizes_by_name = {} # Symbol to set of int sizes
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for line in output.split("\n"):
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# Keep only weak symbols with default values (e.g. emitted inline functions).
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# Example line: "0000000000000000 0000000000000107 W symbol_name"
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# First number is offset, second is size.
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# Note this is decimal because of radix=d.
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m = re.match(r"\d+ (\d+) W (.*)\t(.*)", line)
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if not m:
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continue
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size, name, filename = m.groups()
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files_by_name.setdefault(name, set()).add(filename)
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sizes_by_name.setdefault(name, set()).add(int(size))
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odr_violations = 0
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for name, sizes in sizes_by_name.items():
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if len(sizes) == 1:
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continue
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files = files_by_name[name]
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# Ignore symbols that only appear in one file.
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# These are typically headers - unclear why they get different sizes but it appears benign.
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if len(files) == 1:
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continue
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# Multiple sizes for this symbol name.
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odr_violations += 1
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print("Multiple sizes for symbol: " + name)
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print("\t%s" % ", ".join([str(x) for x in sizes]))
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print("\tFound in files:")
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for filename in files:
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print("\t\t%s" % filename)
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if odr_violations == 0:
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print("No ODR violations found, hooray\n")
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# Show potential weak symbols.
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suspicious_odrs = 0
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for (name, files) in files_by_name.items():
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if len(files) != 1:
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continue
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(filename,) = files
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if ".cpp" in filename:
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if suspicious_odrs == 0:
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print("Some suspicious singles:")
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suspicious_odrs += 1
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print("\t%s" % name)
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print("\t\tIn file %s" % filename)
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