From 7492b67e65b48a7835c5fee671b181803a7e5896 Mon Sep 17 00:00:00 2001
From: Tom Hacohen <tom@stosb.com>
Date: Wed, 7 Dec 2016 12:33:59 +0000
Subject: Eo gdb: Implement eo_data_get to get eo data.

Like 79d76fb25ece4ffbf5785b4be2b030f062ef9f2c, this is useful when
debugging a core dump.

It accepts a valid pointer to an object, for example as returned from
$eo_resolve, and a name of a class or mixin, and returns a pointer to
the private data. Essentially the same as efl_data_scope_get(), but also
works on core dumps, and accepts a class name instead of a class
pointer.

Usage:
Print the pointer:
 (gdb) print $eo_data_get($eo_resolve(obj), "Efl_Canvas_Object")
 $1 = (void *) 0x555555eb9290

Use it directly (e.g. to print a value):
 (gdb) print ((Evas_Object_Protected_Data *) $eo_data_get($eo_resolve(obj),
              "Efl_Canvas_Object"))->last_event_type
 $2 = EVAS_CALLBACK_MOUSE_UP

@feature
---
 data/eo/eo_gdb.py | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

(limited to 'data/eo/eo_gdb.py')

diff --git a/data/eo/eo_gdb.py b/data/eo/eo_gdb.py
index e54797d68e..6a58a6c507 100644
--- a/data/eo/eo_gdb.py
+++ b/data/eo/eo_gdb.py
@@ -81,3 +81,52 @@ class Eo_resolve(gdb.Function):
 
 
 Eo_resolve()
+
+
+class Eo_data_get(gdb.Function):
+    def __init__(self):
+        gdb.Function.__init__(self, 'eo_data_get')
+
+    def invoke(self, ptr, kls_name):
+        ptr = ptr.cast(null_ptr.type)  # Make sure it's the right type
+
+        if int(ptr) == 0:
+            gdb.write('Object is not a valid pointer (NULL).\n')
+            return null_ptr
+
+        kls_name = kls_name.string()
+        extns = ptr['klass']['mro']
+        kls = None
+
+        i = 0
+        while int(extns[i]) != 0:
+            if extns[i]['desc']['name'].string() == kls_name:
+                kls = extns[i]
+            i += 1
+
+        if kls is None:
+            gdb.write('Class "{}" not found in the object mro.\n'
+                      .format(kls_name))
+            return null_ptr
+
+        # Check if not mixin
+        if int(kls['desc']['type']) != 3:
+            return gdb.parse_and_eval('(void *) (((char *) {}) + {})'
+                                      .format(ptr, kls['data_offset']))
+        else:
+            extn_off = ptr['klass']['extn_data_off']
+            if int(extn_off) == 0:
+                return null_ptr
+
+            i = 0
+            while int(extn_off[i]['klass']) != 0:
+                kls = extn_off[i]['klass']
+                if kls['desc']['name'].string() == kls_name:
+                    return gdb.parse_and_eval('(void *) (((char *) {}) + {})'
+                                              .format(ptr, kls['data_offset']))
+                i += 1
+
+        return null_ptr
+
+
+Eo_data_get()
-- 
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