BASELINE: Update Chromium to 85.0.4183.14085-based

Change-Id: Iaa42f4680837c57725b1344f108c0196741f6057
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 43 insertions, 0 deletions

diff --git a/chromium/v8/src/heap/base/stack.h b/chromium/v8/src/heap/base/stack.h
new file mode 100644
index 00000000000..a46e6e660ed
--- /dev/null
+++ b/chromium/v8/src/heap/base/stack.h
@@ -0,0 +1,43 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_HEAP_BASE_STACK_H_
+#define V8_HEAP_BASE_STACK_H_
+
+#include "src/base/macros.h"
+
+namespace heap {
+namespace base {
+
+class StackVisitor {
+ public:
+  virtual void VisitPointer(const void* address) = 0;
+};
+
+// Abstraction over the stack. Supports handling of:
+// - native stack;
+// - ASAN/MSAN;
+// - SafeStack: https://releases.llvm.org/10.0.0/tools/clang/docs/SafeStack.html
+class V8_EXPORT_PRIVATE Stack final {
+ public:
+  explicit Stack(const void* stack_start);
+
+  // Returns true if |slot| is part of the stack and false otherwise.
+  bool IsOnStack(void* slot) const;
+
+  // Word-aligned iteration of the stack. Slot values are passed on to
+  // |visitor|.
+  void IteratePointers(StackVisitor* visitor) const;
+
+  // Returns the start of the stack.
+  const void* stack_start() const { return stack_start_; }
+
+ private:
+  const void* stack_start_;
+};
+
+}  // namespace base
+}  // namespace heap
+
+#endif  // V8_HEAP_BASE_STACK_H_