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7b7dde37f5
When an exception is raised, it can leak memory in `head`. There are two
places that can leak memory:
1. `Check_Type(tuple, T_ARRAY)` can leak memory if `tuple` is not an
array.
2. `StringValue(name)` and `StringValue(value)` if they are not strings
and the call to `to_str` does not return a string.
This commit fixes these memory leaks by wrapping the code around a
rb_ensure so that the memory is freed in all cases.
The following code demonstrates the memory leak:
emitter = Psych::Emitter.new(StringIO.new)
nil_to_string_tags = [[nil, "tag:TALOS"]] + ([1] * 1000)
expected_array_tags = [1] * 1000
10.times do
1_000.times do
# Raises `no implicit conversion of nil into String`
emitter.start_document([], nil_to_string_tags, 0)
rescue TypeError
end
1_000.times do
# Raises `wrong argument type Integer (expected Array)`
emitter.start_document([], expected_array_tags, 0)
rescue TypeError
end
puts `ps -o rss= -p #{$$}`
end
Before:
47248
79728
111968
144224
176480
208896
241104
273280
305472
337664
After:
14832
15088
15344
15344
15360
15632
15632
15632
15648
15648
https://github.com/ruby/psych/commit/053af73818