On 20 Jul 2009, at 17:12, Paul Ishenin wrote:
I have found that next functions are not described here:
http://freepascal.org/docs-html/rtl/system/index.html
Several of them are 2.3.1, so it's normal that they are not yet in the
documentation.
The functions are:
- BitSizeOf
It's similar to sizeof, except that it returns the size in bits of the
type when it is used in a bitpacked record or array.
- get_frame
It returns a pointer to the current routine's stack frame, and at the
same time makes sure that the compiler does not optimize the stack
frame of the current routine away.
- Pack
- ReadStr
- Unpack
- WriteStr
These come straight from ISO (Standard or Extended) Pascal and behave
exactly as described in the standards:
* Pack, Unpack:
http://www.moorecad.com/standardpascal/iso7185.html#6.6.5.4%20Transfer%20procedures
* ReadStr, WriteStr: section 6.7.5.5 of http://www.moorecad.com/standardpascal/iso10206.pdf
(p. 86 of the pdf)
- Unaligned
Make the compiler assume that the argument is an unaligned memory
location (it takes a "var" parameter, i.e., not a pointer but what the
pointer points to), and hence that the compiler should use load
instructions that are safe in such a situation on CPUs that require
this (such as ARM and SPARC).
Jonas
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