1 files changed, 103 insertions, 0 deletions
diff --git a/lib/Frontend/ASTMerge.cpp b/lib/Frontend/ASTMerge.cpp
new file mode 100644
index 0000000..2228ea4
--- /dev/null
+++ b/lib/Frontend/ASTMerge.cpp
@@ -0,0 +1,103 @@
+//===-- ASTMerge.cpp - AST Merging Frontent Action --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTDiagnostic.h"
+#include "clang/AST/ASTImporter.h"
+
+using namespace clang;
+
+ASTConsumer *ASTMergeAction::CreateASTConsumer(CompilerInstance &CI,
+                                               llvm::StringRef InFile) {
+  return AdaptedAction->CreateASTConsumer(CI, InFile);
+}
+
+bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI,
+                                           llvm::StringRef Filename) {
+  // FIXME: This is a hack. We need a better way to communicate the
+  // AST file, compiler instance, and file name than member variables
+  // of FrontendAction.
+  AdaptedAction->setCurrentFile(getCurrentFile(), takeCurrentASTUnit());
+  AdaptedAction->setCompilerInstance(&CI);
+  return AdaptedAction->BeginSourceFileAction(CI, Filename);
+}
+
+void ASTMergeAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  CI.getDiagnostics().getClient()->BeginSourceFile(
+                                         CI.getASTContext().getLangOptions());
+  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
+                                       &CI.getASTContext());
+  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
+    ASTUnit *Unit = ASTUnit::LoadFromPCHFile(ASTFiles[I], CI.getDiagnostics(),
+                                             false);
+    if (!Unit)
+      continue;
+
+    ASTImporter Importer(CI.getDiagnostics(),
+                         CI.getASTContext(), 
+                         CI.getFileManager(),
+                         Unit->getASTContext(), 
+                         Unit->getFileManager());
+
+    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
+    for (DeclContext::decl_iterator D = TU->decls_begin(), 
+                                 DEnd = TU->decls_end();
+         D != DEnd; ++D) {
+      // Don't re-import __va_list_tag, __builtin_va_list.
+      if (NamedDecl *ND = dyn_cast<NamedDecl>(*D))
+        if (IdentifierInfo *II = ND->getIdentifier())
+          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
+            continue;
+      
+      Importer.Import(*D);
+    }
+
+    delete Unit;
+  }
+
+  AdaptedAction->ExecuteAction();
+  CI.getDiagnostics().getClient()->EndSourceFile();
+}
+
+void ASTMergeAction::EndSourceFileAction() {
+  return AdaptedAction->EndSourceFileAction();
+}
+
+ASTMergeAction::ASTMergeAction(FrontendAction *AdaptedAction,
+                               std::string *ASTFiles, unsigned NumASTFiles)
+  : AdaptedAction(AdaptedAction), ASTFiles(ASTFiles, ASTFiles + NumASTFiles) {
+  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
+}
+
+ASTMergeAction::~ASTMergeAction() { 
+  delete AdaptedAction;
+}
+
+bool ASTMergeAction::usesPreprocessorOnly() const {
+  return AdaptedAction->usesPreprocessorOnly();
+}
+
+bool ASTMergeAction::usesCompleteTranslationUnit() {
+  return AdaptedAction->usesCompleteTranslationUnit();
+}
+
+bool ASTMergeAction::hasPCHSupport() const {
+  return AdaptedAction->hasPCHSupport();
+}
+
+bool ASTMergeAction::hasASTSupport() const {
+  return AdaptedAction->hasASTSupport();
+}
+
+bool ASTMergeAction::hasCodeCompletionSupport() const {
+  return AdaptedAction->hasCodeCompletionSupport();
+}