File: merge-stats.py

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#!/usr/bin/env python3
"""
Merge .stats files generated by llvm tools

merge-stats.py takes as argument a list of stats files to merge
and output the result on stdout

Usage:
  merge-stats.py $(find ./builddir/ -name "*.stats") > total.stats
"""

import json
import sys

result = {}

for arg in range(1, len(sys.argv)):
    with open(sys.argv[arg], "r", encoding="utf-8", errors="ignore") as f:
        text = f.read()
        try:
            data = json.loads(text)
        except:
            print("ignored %s: failed to parse" % sys.argv[arg], file=sys.stderr)
            continue
        for key in data:
            if key in result:
                result[key] += data[key]
            else:
                result[key] = data[key]

out = json.dumps(result, indent=2)
print(out)