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40 lines
1 KiB
Python
40 lines
1 KiB
Python
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#!/usr/bin/env nix-shell
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#!nix-shell -i python3 -p python3 --pure
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# To be used with `--trace-function-calls` and `-vvvv` and
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# `flamegraph.pl`.
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#
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# For example:
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#
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# nix-instantiate --trace-function-calls -vvvv '<nixpkgs>' -A hello 2> nix-function-calls.trace
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# ./contrib/stack-collapse.py nix-function-calls.trace > nix-function-calls.folded
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# nix-shell -p flamegraph --run "flamegraph.pl nix-function-calls.folded > nix-function-calls.svg"
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import sys
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from pprint import pprint
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import fileinput
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stack = []
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timestack = []
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for line in fileinput.input():
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components = line.strip().split(" ", 2)
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if components[0] != "function-trace":
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continue
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direction = components[1]
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components = components[2].rsplit(" ", 2)
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loc = components[0]
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_at = components[1]
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time = int(components[2])
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if direction == "entered":
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stack.append(loc)
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timestack.append(time)
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elif direction == "exited":
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dur = time - timestack.pop()
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vst = ";".join(stack)
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print(f"{vst} {dur}")
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stack.pop()
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