5 files changed, 159 insertions, 0 deletions
diff --git a/libs/kstd/gdb/__init__.py b/libs/kstd/gdb/__init__.py
new file mode 100644
index 0000000..c5d1e53
--- /dev/null
+++ b/libs/kstd/gdb/__init__.py
@@ -0,0 +1,23 @@
+import gdb.printing
+
+from .vector import KstdVectorPrinter
+from .string import KstdStringPrinter
+from .smart_pointers import (
+    KstdUniquePtrPrinter,
+    KstdSharedPtrPrinter,
+    KstdObserverPtrPrinter,
+)
+
+
+def build_pretty_printers():
+    pp = gdb.printing.RegexpCollectionPrettyPrinter("kstd")
+    pp.add_printer("vector", "^kstd::vector<.*>$", KstdVectorPrinter)
+    pp.add_printer("string", "^kstd::string$", KstdStringPrinter)
+    pp.add_printer("unique_ptr", "^kstd::unique_ptr<.*>$", KstdUniquePtrPrinter)
+    pp.add_printer("shared_ptr", "^kstd::shared_ptr<.*>$", KstdSharedPtrPrinter)
+    pp.add_printer("observer_ptr", "^kstd::observer_ptr<.*>$", KstdObserverPtrPrinter)
+    return pp
+
+
+def register_printers(objfile):
+    gdb.printing.register_pretty_printer(objfile, build_pretty_printers(), replace=True)
diff --git a/libs/kstd/gdb/smart_pointers.py b/libs/kstd/gdb/smart_pointers.py
new file mode 100644
index 0000000..f6e8a45
--- /dev/null
+++ b/libs/kstd/gdb/smart_pointers.py
@@ -0,0 +1,68 @@
+import gdb
+
+
+class KstdUniquePtrPrinter(gdb.ValuePrinter):
+    def __init__(self, val):
+        self.__val = val
+        self.__type = val.type.template_argument(0)
+
+    def to_string(self):
+        pointer = self.__val["pointer"]
+        if int(pointer) == 0:
+            return f"kstd::unique_ptr<{self.__type}> (empty)"
+        return f"kstd::unique_ptr<{self.__type}>"
+
+    def children(self):
+        pointer = self.__val["pointer"]
+        if int(pointer) != 0:
+            yield ("get()", pointer.dereference())
+
+    def display_hint(self):
+        return None
+
+
+class KstdSharedPtrPrinter(gdb.ValuePrinter):
+    def __init__(self, val):
+        self.__val = val
+        self.__type = val.type.template_argument(0)
+
+    def to_string(self):
+        pointer = self.__val["pointer"]
+        control_block = self.__val["control"]
+
+        if int(pointer) == 0 or int(control_block) == 0:
+            return f"shared_ptr<{self.__type}> (empty)"
+
+        strong_refs = int(control_block["shared_count"]["_M_i"])
+        weak_refs = int(control_block["weak_count"]["_M_i"])
+
+        return (
+            f"shared_ptr<{self.__type}> use count {strong_refs}, weak count {weak_refs}"
+        )
+
+    def children(self):
+        pointer = self.__val["pointer"]
+        control_block = self.__val["control"]
+
+        if int(pointer) != 0:
+            yield ("get()", pointer.dereference())
+
+    def display_hint(self):
+        return None
+
+
+class KstdObserverPtrPrinter(gdb.ValuePrinter):
+    def __init__(self, val):
+        self.__val = val
+        self.__type = val.type.template_argument(0)
+        self.__pointer = val["m_ptr"]
+
+    def to_string(self):
+        return f"{(self.__pointer)}"
+
+    def children(self):
+        if int(self.__pointer) != 0:
+            yield ("get()", self.__pointer.dereference())
+
+    def display_hint(self):
+        return None
diff --git a/libs/kstd/gdb/string.py b/libs/kstd/gdb/string.py
new file mode 100644
index 0000000..73c22d6
--- /dev/null
+++ b/libs/kstd/gdb/string.py
@@ -0,0 +1,27 @@
+import gdb
+
+
+class KstdStringPrinter(gdb.ValuePrinter):
+
+    def __init__(self, val):
+        self.__val = val
+
+    def to_string(self):
+        storage = self.__val["m_storage"]
+        storage_size = int(storage["m_size"])
+
+        if storage_size <= 0:
+            return '""'
+
+        data_pointer = storage["m_data"]
+        string_length = storage_size - 1
+
+        try:
+            if hasattr(data_pointer, "lazy_string"):
+                return data_pointer.lazy_string(encoding="utf-8", length=string_length)
+            return data_pointer.string(encoding="utf-8", length=string_length)
+        except gdb.error:
+            return "<unreadable memory>"
+
+    def display_hint(self):
+        return "string"
diff --git a/libs/kstd/gdb/units.py b/libs/kstd/gdb/units.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libs/kstd/gdb/units.py
diff --git a/libs/kstd/gdb/vector.py b/libs/kstd/gdb/vector.py
new file mode 100644
index 0000000..f11e064
--- /dev/null
+++ b/libs/kstd/gdb/vector.py
@@ -0,0 +1,41 @@
+import gdb
+
+
+class KstdVectorPrinter(gdb.ValuePrinter):
+    class Iterator:
+        def __init__(self, begin: gdb.Value, end: gdb.Value):
+            self._item = begin
+            self._end = end
+            self._count = 0
+
+        def __iter__(self):
+            return self
+
+        def __next__(self):
+            count = self._count
+            self._count = count + 1
+
+            if self._item == self._end:
+                raise StopIteration
+
+            element = self._item.dereference()
+            self._item = self._item + 1
+            return (f"[{count}]", element)
+
+    def __init__(self, val: gdb.Value):
+        self.__val = val
+        self.__size = int(val["m_size"])
+        self.__capacity = int(val["m_capacity"])
+        self.__data = val["m_data"]
+
+    def to_string(self):
+        return f"vector of length {self.__size}, capacity {self.__capacity}"
+
+    def children(self):
+        return self.Iterator(self.__data, self.__data + self.__size)
+
+    def display_hint(self):
+        return "array"
+
+    def num_children(self):
+        return self.__size