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This reduces much function call overhead. getnext is defined in xml.h for
inline optimization. sfeed only uses one XML parser context per program, this
allows further optimizations of the compiler also.
On OpenBSD it was noticable because of retpoline etc function call overhead.
Using clang and a 500MB test XML file reduces processing time from +- 12s to
5s.
Tested using some crazy optimization flags:
SFEED_CFLAGS = -O3 -std=c99 -DGETNEXT=getchar_unlocked -fno-ret-protector \
-mno-retpoline -static
A GETNEXT macro is also nice for programs which mmap(2) some big XML file. Then
you can simply define:
#define GETNEXT() (off >= len ? EOF : reg[off++])
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this allows to override x->getnext to expand to global context parsing and
allows the compiler to optimize this inline.
also remove checking if the x->getnext function exists (just crash hard).
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... this does not expose the uint* types either.
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In the parser itself allow reading '\0' in the XML itself. Add a length
parameter to specify the buffer size.
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also:
- rename xmlparser_ prefix to xml_.
- make xml_parse public, this allows a custom reader like a direct mmap,
see: XMLParser.getnext and (optionall) XMLParser.getnext_data.
- improve the README text.
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+ minor code style.
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Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
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Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
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lots of things changed, but cleanup todo. changelog and consistent stream of small updates will come in the future.
Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
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todo though
Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
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Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
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