update debug providers to match new RawVec capacity field

Author: the8472

src/etc/gdb_providers.py

@@ -154,7 +154,11 @@ def __init__(self, valobj):
         self._valobj = valobj
         self._head = int(valobj["head"])
         self._size = int(valobj["len"])
-        self._cap = int(valobj["buf"]["cap"])
+        # BACKCOMPAT: rust 1.75
+        cap = valobj["buf"]["cap"]
+        if cap.type.code != gdb.TYPE_CODE_INT:
+            cap = cap[ZERO_FIELD]
+        self._cap = int(cap)
         self._data_ptr = unwrap_unique_or_non_null(valobj["buf"]["ptr"])
 
     def to_string(self):

src/etc/lldb_providers.py

@@ -267,7 +267,8 @@ class StdVecSyntheticProvider:
     """Pretty-printer for alloc::vec::Vec<T>
 
     struct Vec<T> { buf: RawVec<T>, len: usize }
-    struct RawVec<T> { ptr: Unique<T>, cap: usize, ... }
+    rust 1.75: struct RawVec<T> { ptr: Unique<T>, cap: usize, ... }
+    rust 1.76: struct RawVec<T> { ptr: Unique<T>, cap: Cap(usize), ... }
     rust 1.31.1: struct Unique<T: ?Sized> { pointer: NonZero<*const T>, ... }
     rust 1.33.0: struct Unique<T: ?Sized> { pointer: *const T, ... }
     rust 1.62.0: struct Unique<T: ?Sized> { pointer: NonNull<T>, ... }
@@ -390,7 +391,10 @@ def update(self):
         self.head = self.valobj.GetChildMemberWithName("head").GetValueAsUnsigned()
         self.size = self.valobj.GetChildMemberWithName("len").GetValueAsUnsigned()
         self.buf = self.valobj.GetChildMemberWithName("buf")
-        self.cap = self.buf.GetChildMemberWithName("cap").GetValueAsUnsigned()
+        cap = self.buf.GetChildMemberWithName("cap")
+        if cap.GetType().num_fields == 1:
+            cap = cap.GetChildAtIndex(0)
+        self.cap = cap.GetValueAsUnsigned()
 
         self.data_ptr = unwrap_unique_or_non_null(self.buf.GetChildMemberWithName("ptr"))