Pascal not considered harmful - was Re: Rich kids are into COBOL
bqt at update.uu.se
Fri Feb 20 19:46:04 CST 2015
On 2015-02-21 02:40, Chuck Guzis wrote:
> "Bootstrapping" compiler code is quite common. So, it's not unusual to
> find FORTRAN source code in FORTRAN compilers, etc. I doubt that many
> compilers are written entirely in assembly nowadays.
I would dare to say that pretty much none are, and none have been for
the last 30 years at least.
> For example, back in the late 70s, I put together a business BASIC
> compiler for the 8080/8085. Theoretically, it was coded in assembly,
> but it wasn't 8085 assembly. The technique was to code in a
> platform-independent assembly language whose data types and operations
> match the language elements that you're working with--words, numbers,
> tokens, etc. Then one codes a small emulator in whatever is handy for
> the target system to get code generation shaken out. Finally, one
> implements the final compiler by taking the specialized machine and
> converting them via macros to native assembly.
Yes. That is pretty much how compilers work today as well. You compile
to some abstract intermediate form, and then you have a backend that
translates into actual machine code for the target machine.
It's been that way for a long time...
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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