kstd/gdb: add error_code and result printers

1 files changed, 66 insertions, 0 deletions

diff --git a/libs/kstd/gdb/error_code.py b/libs/kstd/gdb/error_code.py
new file mode 100644
index 00000000..1569f59a
--- /dev/null
+++ b/libs/kstd/gdb/error_code.py
@@ -0,0 +1,66 @@
+import gdb
+
+
+class KstdErrorCodePrinter(gdb.ValuePrinter):
+    def __init__(self, val):
+        self.__val = val
+
+    def _error_value(self):
+        return int(self.__val["m_value"])
+
+    def _category_name(self):
+        try:
+            category_pointer = self.__val["m_category"]
+            if int(category_pointer) == 0:
+                return "<null category>"
+            category = category_pointer.dereference()
+            try:
+                dynamic = category.dynamic_type
+                name = str(dynamic)
+            except gdb.error:
+                name = str(category.type)
+            name = name.replace("(anonymous namespace)::", "")
+            if name.endswith("_t"):
+                name = name[:-2]
+            return name
+        except (gdb.error, AttributeError):
+            return "?"
+
+    def _message(self):
+        try:
+            category_pointer = self.__val["m_category"]
+            if int(category_pointer) == 0:
+                return None
+            value = self._error_value()
+            address = int(category_pointer)
+            result = gdb.parse_and_eval(
+                f"((kstd::error_category const *){address:#x})->message({value})"
+            )
+            try:
+                ptr = result["_M_str"]
+                length = int(result["_M_len"])
+                if int(ptr) != 0 and length > 0:
+                    return ptr.string(length=length)
+            except (gdb.error, AttributeError, KeyError):
+                pass
+            return str(result)
+        except (gdb.error, RuntimeError):
+            return None
+
+    def to_string(self):
+        value = self._error_value()
+        category = self._category_name()
+        msg = self._message()
+        if msg is not None:
+            return f"{category}:{value} ({msg})"
+        return f"{category}:{value}"
+
+    def children(self):
+        yield ("value", self.__val["m_value"])
+        category_pointer = self.__val["m_category"]
+        if int(category_pointer) != 0:
+            yield ("category", category_pointer.dereference())
+
+    def display_hint(self):
+        return None
+