On 2 Feb 2007, at 09:53, Geoffrey D Alexander wrote:
I have a C parser (using the C skeleton) that contains C++ code
that I'm
compiling with g++. The parser works fine. But a previous thread
titled
"bison and C++" from December 2006 said that compiling C parsers
with a
C++ compiler is no longer support. So, I converted my compiler to use
the C++ skeleton. Functionally, this worked fine. The new C++ parser
produces the same output as the old C-based parser.
However, I did notice a slowdown of 5 to 20 percent in the C++ parser.
Also, the C++ parser shows an increase of 10 to 15 percent in the
number
of memory allocation as reported by valgrind.
Is this a known problem? Are there plan to improve C++ parser
performance?
People do not bother about such things, as typically, the parser does
not take up much time in a compiler/interpreter: most time is spent
in the lexer and the actions. In addition, memory is ample nowadays.
So, for example, LR(1) becomes feasible but, which may blow up memory
several times relative the LALR(1) that Bison uses.
Hans Aberg
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