From: Jorge Gorbe <j.gorbe@stcsl.es>
Date: Mon, 29 Oct 2012 13:59:50 +0000 (+0100)
Subject: changed viewer script to gtk/cairo/pango
X-Git-Url: http://slack.codemaniacs.com/git/?a=commitdiff_plain;h=12c67fdbec73f05b75b5ed345bf36c006cab90a2;p=resacon2012.git

changed viewer script to gtk/cairo/pango
---

diff --git a/index.html b/index.html
index c7761ae..44f6ee9 100644
--- a/index.html
+++ b/index.html
@@ -94,10 +94,13 @@ End with a line saying just "end".
 &gt;end
 </pre>
 <p>I called this <a href="http://slackito.com/2011/12/09/poor-mans-tracepoints-with-gdb/">"Poor man's tracepoints"</a> in a blog post some years ago</p>
+<p class="slide">
+  The <code>cont</code> there makes this workaround fail with single stepping (but this is solvable with Python, see
+  <a href="http://tromey.com/blog/?p=698">this blog post</a>)
 </section>
 
 <section class="slide">
-	<h2> Custom commands (1/2) </h2>
+	<h2> Custom commands (1/3) </h2>
 <pre>
 (gdb) define plist
 Type commands for definition of "plist".
@@ -112,24 +115,81 @@ End with a line saying just "end".
 </section>
 
 <section class="slide">
-	<h2> Custom commands (2/2) </h2>
-        <p> You can create hooks which run just before or after any gdb command: </p>
-        <ul style="text-align:left;">
-            <li> <code>define hook-command</code> to run things <b>before</b> <code>command</code> </li>
-            <li> <code>define hookpost-command</code> to run things <b>after</b> <code>command</code> </li>
+<h2> Custom commands (2/3) </h2>
+<p>A more complex example, from PpluX's <a href="http://code.google.com/p/slb/source/browse/extra/lua_utils.gdb?name=default">SLB repo</a></p>
+
+<pre>
+define luastack
+    set $top = lua_gettop($arg0)
+    set $i = 1
+    while $i <= $top
+        if lua_type($arg0,$i) == -1
+            printf "stack - %i : No Value \n", $i
+        else
+            call lua_pushvalue($arg0,$i)
+            set $str = lua_tolstring($arg0,-1,0x0)
+            set $type = lua_typename($arg0,lua_type($arg0,$i))
+            if $str
+                printf "stack - %i : %s -> '%s'\n", $i, $type , $str
+            else
+                printf "stack - %i : %s\n", $i, $type
+            end
+            call lua_settop($arg0,-2)
+        end
+        set $i = $i + 1
+    end
+</pre>
+
+</section>
+
+<section class="slide">
+    <h2> Custom commands (3/3) </h2>
+    <p> You can also create hooks which run just before or after any gdb command: </p>
+    <ul style="text-align:left;">
+        <li> <code>define hook-command</code> to run things <b>before</b> <code>command</code> </li>
+        <li> <code>define hookpost-command</code> to run things <b>after</b> <code>command</code> </li>
 
 </section>
 
+<section class="slide">
+<h2> Python API </h2>
+<ul>
+    <li> Available since GDB 7 </li>
+    <li> Still being refined </li>
+
+</section>
+
+<section class="slide">
+</section>
+
+<section class="slide">
+</section>
+
+<section class="slide">
+</section>
+
 <section class="slide">
     <h2>Did you know...?</h2>
     <p> GDB has many other semi-unknown cool features (which I won't talk about today) </p>
     <ul style="text-align:left;">
-        <li class="slide"> <h3>Reverse debugging</h3> records (some finite amount of) program history and allows backwards stepping/running.  </li>
+        <li class="slide"> <h3>Debug info in external files</h3> You can move debug info from compiled objects and point gdb to it (like PDBs in VS)</li>
+        <li class="slide"> <h3>Reverse debugging</h3> Records (some finite amount of) program history and allows backwards stepping/running.  </li>
         <li class="slide"> <h3>JIT interface</h3>a JIT can generate debug symbols and pass them on-the-fly to gdb to ease debugging (supported by LLVM!). </li>
     </ul>
 </section>
 
+<section class="slide">
+    <h2>Wish list</h2>
+    <p>Other debuggers also have cool features</p>
+    <ul style="text-align:left;">
+        <li class="slide"> <h3>Symbol server support</h3> records (some finite amount of) program history and allows backwards stepping/running.  </li>
+    </ul>
+</section>
 
+<section class="slide">
+    <h2>Resources</h2>
+    <p> <a href="http://sourceware.org/gdb/wiki/PythonGdbTutorial">http://sourceware.org/gdb/wiki/PythonGdbTutorial</a> </p>
+</section>
 
 <!-- End slides. -->
 
diff --git a/samples/script.py b/samples/script.py
index d862955..b93f299 100644
--- a/samples/script.py
+++ b/samples/script.py
@@ -1,5 +1,6 @@
 import gdb
-from PyQt4 import QtGui
+import gtk
+import pangocairo
 
 def print_node(node, recursion_level):
     if len(node.type.fields()) == 0:
@@ -19,6 +20,43 @@ def print_node(node, recursion_level):
             result[f.name] = result_child
     return result
 
+
+
+class GraphViewer(gtk.DrawingArea):
+    def __init__(self):
+        super(gtk.DrawingArea, self).__init__()
+        self.connect("expose_event", self.expose)
+
+    def expose(self, widget, event):
+        context = widget.window.cairo_create()
+        context.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
+        context.clip()
+        self.draw(context)
+        return False
+
+    def draw(self, context):
+        rect = self.get_allocation() # widget dimensions?
+
+        pangocairo_context = pangocairo.CairoContext(context)
+        layout = pangocairo_context.create_layout()
+        layout.set_text("Trololol")
+        context.move_to(100,100)
+        pangocairo_context.show_layout(layout)
+
+
+        #context.set_source_rgb(1.0, 0.0, 0.0)
+        context.move_to(0,0)
+        context.line_to(200,100)
+        context.set_line_width(4)
+        context.stroke()
+
+        context.rectangle(200,200,50,50)
+        context.set_line_width(1)
+        context.stroke()
+        
+
+
+
 class ViewerCommand(gdb.Command):
     """View data structures"""
     def __init__(self):
@@ -28,11 +66,21 @@ class ViewerCommand(gdb.Command):
     def invoke(self, arg, from_tty):
         args = gdb.string_to_argv(arg)
         value = gdb.parse_and_eval(args[0])
-        if len(args) > 1:
-            recursion_level = int(args[1])
-        else:
-            recursion_level = 3
-        print print_node(value.dereference(), recursion_level)
+
+        window = gtk.Window()
+        viewer = GraphViewer()
+        window.add(viewer)
+        window.connect("destroy", gtk.main_quit)
+        window.set_default_size(600,600)
+        window.show_all()
+        gtk.main()
+
+        #if len(args) > 1:
+        #    recursion_level = int(args[1])
+        #else:
+        #    recursion_level = 3
+        #print print_node(value.dereference(), recursion_level)
+