mmio: Add mmio_ptr template.

1 files changed, 67 insertions, 0 deletions

diff --git a/gdb_plugins/mmio.py b/gdb_plugins/mmio.py
new file mode 100644
index 0000000..25ebcc3
--- /dev/null
+++ b/gdb_plugins/mmio.py
@@ -0,0 +1,67 @@
+import gdb.xmethod
+
+class RefWorker(gdb.xmethod.XMethodWorker):
+    def __init__(self, result_type):
+        self.result_type = result_type
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self.result_type.reference()
+ 
+    def __call__(self, obj):
+        return obj['p'].cast(self.result_type.pointer()).dereference()
+
+class PtrWorker(gdb.xmethod.XMethodWorker):
+    def __init__(self, result_type):
+        self.result_type = result_type
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self.result_type.pointer()
+ 
+    def __call__(self, obj):
+        return obj['p'].cast(self.result_type.pointer())
+
+class SubscriptWorker(gdb.xmethod.XMethodWorker):
+    def __init__(self, result_type):
+        self.result_type = result_type
+
+    def get_arg_types(self):
+        return [gdb.lookup_type('std::size_t')]
+
+    def get_result_type(self, obj, idx):
+        return self.result_type.reference()
+ 
+    def __call__(self, obj, idx):
+        return obj['p'].cast(self.result_type.pointer())[idx]
+
+class Method(gdb.xmethod.XMethod):
+    def __init__(self, name, worker):
+        gdb.xmethod.XMethod.__init__(self, name)
+        self.worker = worker
+ 
+class Matcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self, 'mmio_ptr matcher')
+
+        self.methods = [
+            Method('operator*', RefWorker),
+            Method('operator->', PtrWorker),
+            Method('operator[]', SubscriptWorker),
+        ]
+ 
+    def match(self, class_type, method_name):
+        if not class_type.name.startswith('mmio_ptr<'):
+            return
+            
+        ptr_type = class_type.template_argument(0)
+
+        for method in self.methods:
+            if method.enabled and method.name == method_name:
+                return method.worker(ptr_type)
+
+gdb.xmethod.register_xmethod_matcher(None, Matcher(), replace = True)