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[Bug gdb/13465] New: typecasting in gdb python pretty-printer
- From: "eric at anholt dot net" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Thu, 01 Dec 2011 19:53:11 +0000
- Subject: [Bug gdb/13465] New: typecasting in gdb python pretty-printer
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=13465
Bug #: 13465
Summary: typecasting in gdb python pretty-printer
Product: gdb
Version: 7.3
Status: NEW
Severity: enhancement
Priority: P2
Component: gdb
AssignedTo: unassigned@sourceware.org
ReportedBy: eric@anholt.net
Classification: Unclassified
Context:
In Mesa graphics drivers implemented in C, there are these Mesa core types
(struct gl_texture_object, struct gl_texture_image), which each driver creates
"subclasses" of by embedding that struct in their own struct as:
struct intel_texture_image {
struct gl_texture_image base;
struct intel_mipmap_tree *mt;
}
When debugging Mesa, we often have a pointer to a base type like struct
gl_texture_image, so to print the information we always want to see we have to
p *(struct intel_context *)tex_image.
What I want:
I'd like to be able to implement a python pretty-printer autoloaded based on my
driver's object file that can make a decision about what type to print one of
these base types as (either by looking at vtbl-like information in some
objects, or just by knowing that if you've got i965_dri.so loaded, every struct
gl_texture_image is a struct intel_texture_image). However, I'm told that
there isn't a way to do that today:
<tromey> so, we don't have a value-replacement facility
<tromey> that might be a nice addition
<xdje> replace the value where?
<tromey> he basically wants something like 'set print object on', that works
for his particular C case
<tromey> based on knowledge of his program
<tromey> without writing a full printer for the enclosing struct
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