1 files changed, 26 insertions, 0 deletions
diff --git a/misc/lldb_rb/commands/heap_page_command.py b/misc/lldb_rb/commands/heap_page_command.py
new file mode 100644
index 0000000000..b56a3eae4e
--- /dev/null
+++ b/misc/lldb_rb/commands/heap_page_command.py
@@ -0,0 +1,26 @@
+import lldb
+
+from lldb_rb.constants import *
+from lldb_rb.rb_base_command import RbBaseCommand
+
+class HeapPageCommand(RbBaseCommand):
+    program = "heap_page"
+    help_string = "prints out 'struct heap_page' for a VALUE pointer in the page"
+
+    def call(self, debugger, command, exe_ctx, result):
+        self.t_heap_page_body = self.target.FindFirstType("struct heap_page_body")
+        self.t_heap_page_ptr = self.target.FindFirstType("struct heap_page").GetPointerType()
+
+        page = self._get_page(self.frame.EvaluateExpression(command))
+        page.Cast(self.t_heap_page_ptr)
+
+        self._append_expression(debugger, "(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
+        self._append_expression(debugger, "*(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
+
+    def _get_page(self, val):
+        addr = val.GetValueAsUnsigned()
+        page_addr = addr & ~(HEAP_PAGE_ALIGN_MASK)
+        address = lldb.SBAddress(page_addr, self.target)
+        body = self.target.CreateValueFromAddress("page", address, self.t_heap_page_body)
+
+        return body.GetValueForExpressionPath("->header.page")