1 files changed, 77 insertions, 0 deletions
diff --git a/clang/lib/Interpreter/IncrementalParser.h b/clang/lib/Interpreter/IncrementalParser.h
new file mode 100644
index 000000000000..aa8142cbe493
--- /dev/null
+++ b/clang/lib/Interpreter/IncrementalParser.h
@@ -0,0 +1,77 @@
+//===--- IncrementalParser.h - Incremental Compilation ----------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the class which performs incremental code compilation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_INTERPRETER_INCREMENTALPARSER_H
+#define LLVM_CLANG_LIB_INTERPRETER_INCREMENTALPARSER_H
+
+#include "clang/Interpreter/PartialTranslationUnit.h"
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+
+#include <list>
+#include <memory>
+namespace llvm {
+class LLVMContext;
+}
+
+namespace clang {
+class ASTConsumer;
+class CompilerInstance;
+class CodeGenerator;
+class DeclGroupRef;
+class FrontendAction;
+class IncrementalAction;
+class Parser;
+
+/// Provides support for incremental compilation. Keeps track of the state
+/// changes between the subsequent incremental input.
+///
+class IncrementalParser {
+  /// Long-lived, incremental parsing action.
+  std::unique_ptr<IncrementalAction> Act;
+
+  /// Compiler instance performing the incremental compilation.
+  std::unique_ptr<CompilerInstance> CI;
+
+  /// Parser.
+  std::unique_ptr<Parser> P;
+
+  /// Consumer to process the produced top level decls. Owned by Act.
+  ASTConsumer *Consumer = nullptr;
+
+  /// Counts the number of direct user input lines that have been parsed.
+  unsigned InputCount = 0;
+
+  /// List containing every information about every incrementally parsed piece
+  /// of code.
+  std::list<PartialTranslationUnit> PTUs;
+
+public:
+  IncrementalParser(std::unique_ptr<CompilerInstance> Instance,
+                    llvm::LLVMContext &LLVMCtx, llvm::Error &Err);
+  ~IncrementalParser();
+
+  const CompilerInstance *getCI() const { return CI.get(); }
+
+  /// Parses incremental input by creating an in-memory file.
+  ///\returns a \c PartialTranslationUnit which holds information about the
+  /// \c TranslationUnitDecl and \c llvm::Module corresponding to the input.
+  llvm::Expected<PartialTranslationUnit &> Parse(llvm::StringRef Input);
+
+private:
+  llvm::Expected<PartialTranslationUnit &> ParseOrWrapTopLevelDecl();
+};
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_INTERPRETER_INCREMENTALPARSER_H