xmerl: replace size/1 by xxx_size/1 #6796
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lthor
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Feb 6, 2023
The <c>size/1</c> BIF is not optimized by the JIT, and its use can result in worse types for Dialyzer. When one knows that the value being tested must be a tuple, <c>tuple_size/1</c> should always be preferred. When one knows that the value being tested must be a binary, <c>byte_size/1</c> should be preferred. However, <c>byte_size/1</c> also accepts a bitstring (rounding up size to a whole number of bytes), so one must make sure that the call to <c>byte_size/</c> is preceded by a call to <c>is_binary/1</c> to ensure that bitstrings are rejected. Note that the compiler removes redundant calls to <c>is_binary/1</c>, so if one is not sure whether previous code had made sure that the argument is a binary, it does not harm to add an <c>is_binary/1</c> test immediately before the call to <c>byte_size/1</c>.
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The size/1 BIF is not optimized by the JIT, and its use can result in worse types for Dialyzer.
When one knows that the value being tested must be a tuple, tuple_size/1 should always be preferred.
When one knows that the value being tested must be a binary, byte_size/1 should be preferred. However, byte_size/1 also accepts a bitstring (rounding up size to a whole number of bytes), so one must make sure that the call to byte_size/ is preceded by a call to is_binary/1 to ensure that bitstrings are rejected. Note that the compiler removes redundant calls to is_binary/1, so if one is not sure whether previous code had made sure that the argument is a binary, it does not harm to add an is_binary/1 test immediately before the call to byte_size/1.
This PR replaces #6783 due to the name branching convention. Apart from that, they are identical in content.