python: Provide textual representation for Inferior and Objfile

Printing a GDB Python object is notoriously not helpful:

>>> print(gdb.selected_inferior())
<gdb.Inferior object at 0x7fea59aed198>
>>> print(gdb.objfiles())
[<gdb.Objfile object at 0x7fea59b57c90>]

This makes printing debug traces more difficult than it should be.  This
patch provides some repr() implementation for these two types (more to
come if people agree with the idea, but I want to test the water first).
Here's the same example as above, but with this patch:

>>> print(gdb.selected_inferior())
<gdb.Inferior num=1>
>>> print(gdb.objfiles())
[<gdb.Objfile filename=/home/emaisin/build/binutils-gdb-gcc-git/gdb/test>]

I implemented repr rather than str, because when printing a list (or
another container I suppose), Python calls the repr method of the
elements.  This is useful when printing a list of inferiors or objfiles.
The print(gdb.objfiles()) above would not have worked if I had
implemented str.

I found this post useful to understand the difference between repr and
str:

  https://stackoverflow.com/questions/1436703/difference-between-str-and-repr

gdb/ChangeLog:

	* python/py-inferior.c (infpy_repr): New.
	(inferior_object_type): Register infpy_repr.
	* python/py-objfile.c (objfpy_repr): New.
	(objfile_object_type): Register objfpy_repr.

gdb/testsuite/ChangeLog:

	* gdb.python/py-inferior.exp: Test repr() of gdb.Inferior.
	* gdb.python/py-objfile.exp: Test repr() of gdb.Objfile.
	* gdb.python/py-symtab.exp: Update test printing an objfile.

gdb/doc/ChangeLog:

	* python.texi (Basic Python): Mention the string representation
	of GDB Python objects.

1 files changed, 4 insertions, 0 deletions

diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi
index 5e2ab76..6e2bf5c 100644
--- a/gdb/doc/python.texi
+++ b/gdb/doc/python.texi
@@ -207,6 +207,10 @@ methods and classes added by @value{GDBN} are placed in this module.
 @value{GDBN} automatically @code{import}s the @code{gdb} module for
 use in all scripts evaluated by the @code{python} command.
 
+Some types of the @code{gdb} module come with a textual representation
+(accessible through the @code{repr} or @code{str} functions).  These are
+offered for debugging purposes only, expect them to change over time.
+
 @findex gdb.PYTHONDIR
 @defvar gdb.PYTHONDIR
 A string containing the python directory (@pxref{Python}).