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Document lazy computation for pretty-printer "children" method 

I found out recently that some users didn't know that the Python
pretty-printers "children" method should compute its result lazily.
This has been a good idea since the earliest days, but wasn't
mentioned in the docs.  This patch adds some text to this effect.

gdb/doc/ChangeLog
2019-05-10  Tom Tromey  <tromey@adacore.com>

	* python.texi (Pretty Printing API): Mention lazy computation for
	"children".
This commit is contained in:
Tom Tromey 2019-05-10 08:19:04 -06:00
parent 71bed2dba6
commit a97c8e5636
2 changed files with 11 additions and 0 deletions
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5
gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2019-05-10 Tom Tromey <tromey@adacore.com>
* python.texi (Pretty Printing API): Mention lazy computation for
"children".
2019-05-10 Tom Tromey <tromey@adacore.com>
* gdb.texinfo (Set Catchpoints): Add text for parameter to "catch

6
gdb/doc/python.texi
View File

@ -1371,6 +1371,12 @@ object which is convertible to a @value{GDBN} value.
This method is optional. If it does not exist, @value{GDBN} will act
as though the value has no children.
For efficiency, the @code{children} method should lazily compute its
results. This will let @value{GDBN} read as few elements as
necessary, for example when various print settings (@pxref{Print
Settings}) or @code{-var-list-children} (@pxref{GDB/MI Variable
Objects}) limit the number of elements to be displayed.
Children may be hidden from display based on the value of @samp{set
print max-depth} (@pxref{Print Settings}).
@end defun