1 files changed, 83 insertions, 0 deletions
diff --git a/include/clang/Sema/TemplateInstCallback.h b/include/clang/Sema/TemplateInstCallback.h
new file mode 100644
index 0000000000000..dc729d52243c5
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+++ b/include/clang/Sema/TemplateInstCallback.h
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+//===- TemplateInstCallback.h - Template Instantiation Callback - C++ --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===---------------------------------------------------------------------===//
+//
+// This file defines the TemplateInstantiationCallback class, which is the
+// base class for callbacks that will be notified at template instantiations.
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TEMPLATE_INST_CALLBACK_H
+#define LLVM_CLANG_TEMPLATE_INST_CALLBACK_H
+
+#include "clang/Sema/Sema.h"
+
+namespace clang {
+
+/// This is a base class for callbacks that will be notified at every
+/// template instantiation.
+class TemplateInstantiationCallback {
+public:
+  virtual ~TemplateInstantiationCallback() = default;
+
+  /// Called before doing AST-parsing.
+  virtual void initialize(const Sema &TheSema) = 0;
+
+  /// Called after AST-parsing is completed.
+  virtual void finalize(const Sema &TheSema) = 0;
+
+  /// Called when instantiation of a template just began.
+  virtual void atTemplateBegin(const Sema &TheSema,
+                               const Sema::CodeSynthesisContext &Inst) = 0;
+
+  /// Called when instantiation of a template is just about to end.
+  virtual void atTemplateEnd(const Sema &TheSema,
+                             const Sema::CodeSynthesisContext &Inst) = 0;
+};
+
+template <class TemplateInstantiationCallbackPtrs>
+void initialize(TemplateInstantiationCallbackPtrs &Callbacks,
+                const Sema &TheSema) {
+  for (auto &C : Callbacks) {
+    if (C)
+      C->initialize(TheSema);
+  }
+}
+
+template <class TemplateInstantiationCallbackPtrs>
+void finalize(TemplateInstantiationCallbackPtrs &Callbacks,
+              const Sema &TheSema) {
+  for (auto &C : Callbacks) {
+    if (C)
+      C->finalize(TheSema);
+  }
+}
+
+template <class TemplateInstantiationCallbackPtrs>
+void atTemplateBegin(TemplateInstantiationCallbackPtrs &Callbacks,
+                     const Sema &TheSema,
+                     const Sema::CodeSynthesisContext &Inst) {
+  for (auto &C : Callbacks) {
+    if (C)
+      C->atTemplateBegin(TheSema, Inst);
+  }
+}
+
+template <class TemplateInstantiationCallbackPtrs>
+void atTemplateEnd(TemplateInstantiationCallbackPtrs &Callbacks,
+                   const Sema &TheSema,
+                   const Sema::CodeSynthesisContext &Inst) {
+  for (auto &C : Callbacks) {
+    if (C)
+      C->atTemplateEnd(TheSema, Inst);
+  }
+}
+
+} // namespace clang
+
+#endif