Update debugger visualizers

Author: Kobzol

src/etc/gdb_providers.py

@@ -169,7 +169,13 @@ def display_hint():
 class StdVecDequeProvider(printer_base):
     def __init__(self, valobj):
         self._valobj = valobj
-        self._head = int(valobj["head"])
+
+        head = valobj["head"]
+
+        # BACKCOMPAT: rust 1.95
+        if head.type.code != gdb.TYPE_CODE_INT:
+            head = head[ZERO_FIELD]
+        self._head = int(head)
         self._size = int(valobj["len"])
         # BACKCOMPAT: rust 1.75
         cap = valobj["buf"]["inner"]["cap"]

src/etc/lldb_providers.py

@@ -1032,7 +1032,7 @@ def StdSliceSummaryProvider(valobj, dict):
 class StdVecDequeSyntheticProvider:
     """Pretty-printer for alloc::collections::vec_deque::VecDeque<T>
 
-    struct VecDeque<T> { head: usize, len: usize, buf: RawVec<T> }
+    struct VecDeque<T> { head: BufferIndex, len: usize, buf: RawVec<T> }
     """
 
     def __init__(self, valobj: SBValue, _dict: LLDBOpaque):
@@ -1061,7 +1061,10 @@ def get_child_at_index(self, index: int) -> Optional[SBValue]:
         return element
 
     def update(self):
-        self.head = self.valobj.GetChildMemberWithName("head").GetValueAsUnsigned()
+        head = self.valobj.GetChildMemberWithName("head")
+        if head.GetType().num_fields == 1:
+            head = head.GetChildAtIndex(0)
+        self.head = head.GetValueAsUnsigned()
         self.size = self.valobj.GetChildMemberWithName("len").GetValueAsUnsigned()
         self.buf = self.valobj.GetChildMemberWithName("buf").GetChildMemberWithName(
             "inner"

src/etc/natvis/liballoc.natvis

@@ -23,7 +23,7 @@
           <If Condition="i == len">
             <Break/>
           </If>
-          <Item>(($T1*)buf.inner.ptr.pointer.pointer)[(i + head) % buf.inner.cap.__0]</Item>
+          <Item>(($T1*)buf.inner.ptr.pointer.pointer)[(i + head.__0) % buf.inner.cap.__0]</Item>
           <Exec>i = i + 1</Exec>
         </Loop>
       </CustomListItems>