Pascal not considered harmful - was Re: Rich kids are into COBOL
bqt at update.uu.se
Fri Feb 20 18:51:25 CST 2015
On 2015-02-21 01:44, ben wrote:
> On 2/20/2015 5:02 PM, Dave G4UGM wrote:
>> Almost all , so there exceptions, modern compliers are written in a high
>> level language. Most use LEXX and YACC or their modern equivalents to
>> generate the program fragments needed to generate the code.
> I would say that is 50%. If you have LEXX and YACC you tend have a
> UNIX system with a C compiler.
You don't even have that. LEX and YACC will give you the basics of the
parsing of the source code. Everything beyond that, you still have to write.
>>> You have a front-end, which does the lexical work and translates the
>>> program into some intermediate form, such as a tree. In the middle, you
>>> have optimization and checking--and finally, you have the back end which
>>> essentially emits code--but that doesn't necessarily imply that the
>>> author knows the numeric opcodes or the precise instruction format.
>>> compiler backends feed into an existing assembler, which puts it all
> How do handle byte operations in C like *x++ on a PDP 10?
Do you need information on how byte operations and byte pointers work on
KCC, which is the one C compiler for the PDP-10 I sortof know something
about, use 9 bit chars, and of course you then get four bytes to a word.
Not sure what in your question is hard to see how it is done.
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|| on a psychedelic trip
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