Welcome back to the mystery machine!
Today, the spooky lex.l. As we saw in the previous post this file is full with constants, but to be more precise this is the file where you tell how to treat every string found. In fact, constants are not defined in this file but in dura.y,
For example:
- “ld return MNEMO_LD”: Whenever you find a string
that’s which characters ld, treat is as a token with value MNEMO_LD
(Mnemotechnic for Load instruction).
- “0x[0-9a-f]+ yylval.val=(int)strtol(yytext,NULL,16);return
NUMERO;”: Whenever you find 0x followed by 1 or more characters from the
set {0-9a-f} (hence, hex), transform them to a long int (as strol can treat
hex values directly) and then to an int and set it to the yylvval, which is
the flex’s return value, and return that this token is a number.
So as you have seen, at least in this case, Flex is the one that is in charge of
understanding the meaning of each token as defined in this file.
From ramen to salvation.
ラーメンたべたい:
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終りの季節:
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Hello!
Welcome to another trip into another dark cave. Today we meet asMSX, an
assembler for MSX’s Z80 made by Pitpan and bought and released with GPL
license by cjv99 (Thanks!).
Motivation
It’s known that this assembler has some bugs, e.g. skipping IFDEFs when
using MegaROM so there is an interest on knowing the internals of the code in
order to fix this kind of bugs. My goal is not directly fixing bugs of this code
but to provide more information about the code so all the people from the
community may get themselves the code and fix it if there are any new bugs.
R, that language that is has gained its momentum due to the people discovering
the need of analyzing data. There are other several alternatives but this is my
poison (or poisson!) of choice. In this post we will try to cover how to
parallelize your R code with the package parallel.
Why bother?
One of my main concerns when I was starting with R is that WOW!
Everything runs in one thread!. I was amazed by the fact that the
language was still being used with that issue inside. How fool I was!
Parallelism is doable in R. But, why must we bother about it? If we were still
living in the era where we only had one core inside the CPU it won’t be an
issue, but some smart guys thought that there was an issue when trying to set
higher frequencies to the CPUs (power consumption mainly) and they decided to
put more CPUs in a chip instead of going to a single faster core. That has been
our paradigm for a couple of years and it appears to be working, right?
⊳ New horizon - 2016-03-23 23:37:28
Well…
Hello. What is expected of the first post of a blog? Well, actually it’s not the first post as this blog was created by $ADMIN for me to put my webcomic on it and I had 3 posts with test for automatic music play in loop (vital for my comics). But I was lazy. Very lazy.
¯_(ツ)_/¯
Whatever. Welcome to the captain’s log on the spaceship to amazing knowledge and Nutella.