llvm-project

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#!/usr/bin/env python
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# This script extracts the VPlan digraphs from the vectoriser debug messages
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# and saves them in individual dot files (one for each plan). Optionally, and
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# providing 'dot' is installed, it can also render the dot into a PNG file.
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from __future__ import print_function
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import sys
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import re
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import argparse
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import shutil
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import subprocess
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parser = argparse.ArgumentParser()
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parser.add_argument("--png", action="store_true")
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args = parser.parse_args()
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dot = shutil.which("dot")
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if args.png and not dot:
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    raise RuntimeError("Can't export to PNG without 'dot' in the system")
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pattern = re.compile(r"(digraph VPlan {.*?\n})", re.DOTALL)
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matches = re.findall(pattern, sys.stdin.read())
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for vplan in matches:
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    m = re.search("graph \[.+(VF=.+,UF.+)", vplan)
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    if not m:
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        raise ValueError("Can't get the right VPlan name")
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    name = re.sub("[^a-zA-Z0-9]", "", m.group(1))
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    if args.png:
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        filename = "VPlan" + name + ".png"
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        print("Exporting " + name + " to PNG via dot: " + filename)
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        p = subprocess.Popen(
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            [dot, "-Tpng", "-o", filename],
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            encoding="utf-8",
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            stdin=subprocess.PIPE,
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            stdout=subprocess.PIPE,
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            stderr=subprocess.PIPE,
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        )
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        out, err = p.communicate(input=vplan)
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        if err:
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            raise RuntimeError("Error running dot: " + err)
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    else:
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        filename = "VPlan" + name + ".dot"
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        print("Exporting " + name + " to DOT: " + filename)
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        with open(filename, "w") as out:
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            out.write(vplan)
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