1 files changed, 123 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/include/lldb/Symbol/CompilerDeclContext.h b/contrib/llvm-project/lldb/include/lldb/Symbol/CompilerDeclContext.h
new file mode 100644
index 000000000000..89b4a9787688
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+++ b/contrib/llvm-project/lldb/include/lldb/Symbol/CompilerDeclContext.h
@@ -0,0 +1,123 @@
+//===-- CompilerDeclContext.h -----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_SYMBOL_COMPILERDECLCONTEXT_H
+#define LLDB_SYMBOL_COMPILERDECLCONTEXT_H
+
+#include <vector>
+
+#include "lldb/Symbol/Type.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/lldb-private.h"
+
+namespace lldb_private {
+
+/// Represents a generic declaration context in a program. A declaration context
+/// is data structure that contains declarations (e.g. namespaces).
+///
+/// This class serves as an abstraction for a declaration context inside one of
+/// the TypeSystems implemented by the language plugins. It does not have any
+/// actual logic in it but only stores an opaque pointer and a pointer to the
+/// TypeSystem that gives meaning to this opaque pointer. All methods of this
+/// class should call their respective method in the TypeSystem interface and
+/// pass the opaque pointer along.
+///
+/// \see lldb_private::TypeSystem
+class CompilerDeclContext {
+public:
+  /// Constructs an invalid CompilerDeclContext.
+  CompilerDeclContext() = default;
+
+  /// Constructs a CompilerDeclContext with the given opaque decl context
+  /// and its respective TypeSystem instance.
+  ///
+  /// This constructor should only be called from the respective TypeSystem
+  /// implementation.
+  ///
+  /// \see lldb_private::TypeSystemClang::CreateDeclContext(clang::DeclContext*)
+  CompilerDeclContext(TypeSystem *type_system, void *decl_ctx)
+      : m_type_system(type_system), m_opaque_decl_ctx(decl_ctx) {}
+
+  // Tests
+
+  explicit operator bool() const { return IsValid(); }
+
+  bool operator<(const CompilerDeclContext &rhs) const {
+    if (m_type_system == rhs.m_type_system)
+      return m_opaque_decl_ctx < rhs.m_opaque_decl_ctx;
+    return m_type_system < rhs.m_type_system;
+  }
+
+  bool IsValid() const {
+    return m_type_system != nullptr && m_opaque_decl_ctx != nullptr;
+  }
+
+  /// Populate a valid compiler context from the current decl context.
+  ///
+  /// \returns A valid vector of CompilerContext entries that describes
+  /// this declaration context. The first entry in the vector is the parent of
+  /// the subsequent entry, so the topmost entry is the global namespace.
+  std::vector<lldb_private::CompilerContext> GetCompilerContext() const;
+
+  std::vector<CompilerDecl> FindDeclByName(ConstString name,
+                                           const bool ignore_using_decls);
+
+  /// Checks if this decl context represents a method of a class.
+  ///
+  /// \return
+  ///     Returns true if this is a decl context that represents a method
+  ///     in a struct, union or class.
+  bool IsClassMethod();
+
+  /// Determines the original language of the decl context.
+  lldb::LanguageType GetLanguage();
+
+  /// Check if the given other decl context is contained in the lookup
+  /// of this decl context (for example because the other context is a nested
+  /// inline namespace).
+  ///
+  /// @param[in] other
+  ///     The other decl context for which we should check if it is contained
+  ///     in the lookoup of this context.
+  ///
+  /// @return
+  ///     Returns true iff the other decl context is contained in the lookup
+  ///     of this decl context.
+  bool IsContainedInLookup(CompilerDeclContext other) const;
+
+  // Accessors
+
+  TypeSystem *GetTypeSystem() const { return m_type_system; }
+
+  void *GetOpaqueDeclContext() const { return m_opaque_decl_ctx; }
+
+  void SetDeclContext(TypeSystem *type_system, void *decl_ctx) {
+    m_type_system = type_system;
+    m_opaque_decl_ctx = decl_ctx;
+  }
+
+  void Clear() {
+    m_type_system = nullptr;
+    m_opaque_decl_ctx = nullptr;
+  }
+
+  ConstString GetName() const;
+
+  ConstString GetScopeQualifiedName() const;
+
+private:
+  TypeSystem *m_type_system = nullptr;
+  void *m_opaque_decl_ctx = nullptr;
+};
+
+bool operator==(const CompilerDeclContext &lhs, const CompilerDeclContext &rhs);
+bool operator!=(const CompilerDeclContext &lhs, const CompilerDeclContext &rhs);
+
+} // namespace lldb_private
+
+#endif // LLDB_SYMBOL_COMPILERDECLCONTEXT_H