Mike Dalessio flavorjones

nokogiri

I should really make this into a real plugin when I get time. But for now it will do.

This gist reproduces a memory usage error in Ruby's iseq_peephole_optimize.

Compile Ruby with ASan (using CFLAGS="-fsanitize=address -ggdb")
Turn off memory leak detection (which is not relevant)export ASAN_OPTIONS=detect_leaks=0
Run ruby ./repro.rb

You should see something like:

before require

	CFLAGS=$(shell ./local/bin/xml2-config --cflags)
	LDFLAGS=$(shell ./local/bin/xml2-config --libs)

	foo: foo.o
	$(CC) -o foo foo.o $(LDFLAGS)

	foo.o: foo.c
	$(CC) $(CFLAGS) -c -o foo.o foo.c

	clean:

	CFLAGS=$(shell ./local/bin/xml2-config --cflags)
	LDFLAGS=$(shell ./local/bin/xml2-config --libs)

	foo: foo.o
	$(CC) -o foo foo.o $(LDFLAGS)

	foo.o: foo.c
	$(CC) $(CFLAGS) -c -o foo.o foo.c

	clean:

	#! /usr/bin/env ruby
	# coding: utf-8

	# Copyright 2022 Mike Dalessio
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
	# associated documentation files (the "Software"), to deal in the Software without restriction,
	# including without limitation the rights to use, copy, modify, merge, publish, distribute,
	# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
	# furnished to do so, subject to the following conditions:

	CFLAGS = -std=c89

	default: run


	benchmark-O0.o: benchmark.c
	$(CC) -O0 $(CFLAGS) -c -o benchmark-O0.o benchmark.c

	lib-O0.o: lib.c
	$(CC) -O0 $(CFLAGS) -c -o lib-O0.o lib.c

	#! /usr/bin/env ruby
	#
	# find transitive reverse dependencies of nokogiri with more than a million downloads: "rdeps.rb nokogiri 1000000"
	#
	require "bundler/inline"

	gemfile do
	gem "json"
	gem "ruby-progressbar"
	end