Inspired by GObject/GType pretty printer.

Example:
machine_set_accel (obj=0x555556807550 [pc-i440fx-4.0-machine],...

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---

v2:
 - simplify python 2 compatibility code, suggested by Eduardo

scripts/qemu-gdb.py | 58 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 mode change 100644 => 100755 scripts/qemu-gdb.py

diff --git a/scripts/qemu-gdb.py b/scripts/qemu-gdb.py
old mode 100644
new mode 100755
index 690827e6fc..1ec666e841
--- a/scripts/qemu-gdb.py
+++ b/scripts/qemu-gdb.py
@@ -21,6 +21,9 @@ import gdb
 
 import os, sys
 
+if sys.version_info[0] < 3:
+    int = long
+
 # Annoyingly, gdb doesn't put the directory of scripts onto the
 # module search path. Do it manually.
 
@@ -47,3 +50,58 @@ coroutine.CoroutinePCFunction()
 # Default to silently passing through SIGUSR1, because QEMU sends it
 # to itself a lot.
 gdb.execute('handle SIGUSR1 pass noprint nostop')
+
+
+def is_object(val):
+    def is_object_helper(type):
+        if str(type) == "Object":
+            return True
+
+        while type.code == gdb.TYPE_CODE_TYPEDEF:
+            type = type.target()
+
+        if type.code != gdb.TYPE_CODE_STRUCT:
+            return False
+
+        fields = type.fields()
+        if len (fields) < 1:
+            return False
+
+        first_field = fields[0]
+        return is_object_helper(first_field.type)
+
+    type = val.type
+    if type.code != gdb.TYPE_CODE_PTR:
+        return False
+    type = type.target()
+    return is_object_helper (type)
+
+
+def object_class_name(instance):
+    try:
+        inst = instance.cast(gdb.lookup_type("Object").pointer())
+        klass = inst["class"]
+        typ = klass["type"]
+        return typ["name"].string()
+    except RuntimeError:
+        pass
+
+
+class QObjectPrinter:
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        name = object_class_name(self.val)
+        if name:
+            return ("0x%x [%s]")% (int(self.val), name)
+        return  ("0x%x") % (int(self.val))
+
+
+def lookup_type(val):
+    if is_object(val):
+        return QObjectPrinter(val)
+    return None
+
+
+gdb.pretty_printers.append(lookup_type)
-- 
2.20.1.98.gecbdaf0899

Patchew URL: https://patchew.org/QEMU/20190204095725.27259-1-marcandre.lureau@redhat.com/



Hi,

This series failed the docker-mingw@fedora build test. Please find the testing commands and
their output below. If you have Docker installed, you can probably reproduce it
locally.

=== TEST SCRIPT BEGIN ===
#!/bin/bash
time make docker-test-mingw@fedora SHOW_ENV=1 J=14
=== TEST SCRIPT END ===


Configure options:
--enable-werror --target-list=x86_64-softmmu,aarch64-softmmu --prefix=/tmp/qemu-test/install --python=/usr/bin/python3 --cross-prefix=x86_64-w64-mingw32- --enable-trace-backends=simple --enable-gnutls --enable-nettle --enable-curl --enable-vnc --enable-bzip2 --enable-guest-agent --with-sdlabi=2.0
ERROR: unknown option --with-sdlabi=2.0
Try '/tmp/qemu-test/src/configure --help' for more information
# QEMU configure log Mon Feb  4 10:12:13 UTC 2019
# Configured with: '/tmp/qemu-test/src/configure' '--enable-werror' '--target-list=x86_64-softmmu,aarch64-softmmu' '--prefix=/tmp/qemu-test/install' '--python=/usr/bin/python3' '--cross-prefix=x86_64-w64-mingw32-' '--enable-trace-backends=simple' '--enable-gnutls' '--enable-nettle' '--enable-curl' '--enable-vnc' '--enable-bzip2' '--enable-guest-agent' '--with-sdlabi=2.0'
---
funcs: do_compiler do_cc compile_object check_define main
lines: 92 122 617 634 0
x86_64-w64-mingw32-gcc -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99 -c -o config-temp/qemu-conf.o config-temp/qemu-conf.c
config-temp/qemu-conf.c:2:2: error: #error __linux__ not defined
 #error __linux__ not defined
  ^~~~~

---
funcs: do_compiler do_cc compile_object check_define main
lines: 92 122 617 686 0
x86_64-w64-mingw32-gcc -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99 -c -o config-temp/qemu-conf.o config-temp/qemu-conf.c
config-temp/qemu-conf.c:2:2: error: #error __i386__ not defined
 #error __i386__ not defined
  ^~~~~

---
funcs: do_compiler do_cc compile_object check_define main
lines: 92 122 617 689 0
x86_64-w64-mingw32-gcc -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99 -c -o config-temp/qemu-conf.o config-temp/qemu-conf.c
config-temp/qemu-conf.c:2:2: error: #error __ILP32__ not defined
 #error __ILP32__ not defined
  ^~~~~

---
lines: 92 128 920 0
x86_64-w64-mingw32-gcc -mthreads -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99 -o config-temp/qemu-conf.exe config-temp/qemu-conf.c -g -liberty
/usr/lib/gcc/x86_64-w64-mingw32/8.2.0/../../../../x86_64-w64-mingw32/bin/ld: cannot find -liberty
collect2: error: ld returned 1 exit status
Failed to run 'configure'
Traceback (most recent call last):
  File "./tests/docker/docker.py", line 563, in <module>


The full log is available at
http://patchew.org/logs/20190204095725.27259-1-marcandre.lureau@redhat.com/testing.docker-mingw@fedora/?type=message.
---
Email generated automatically by Patchew [http://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

Is your subject accurate?  To my (admittedly ignorant) eyes, the patch
looks like an *Object* pretty-printer, not a *QObject* pretty-printer.

Hi

On Mon, Feb 4, 2019 at 3:00 PM Markus Armbruster <armbru@redhat.com> wrote:
>
> Is your subject accurate?  To my (admittedly ignorant) eyes, the patch
> looks like an *Object* pretty-printer, not a *QObject* pretty-printer.
>

Yes Object, not QObject, sorry, the confusion will remain for a long time..

feel free to change commit message on commit,

thanks

-- 
Marc-André Lureau