Add CompilerInstance::createPCHExternalASTSource.
llvm-svn: 87097
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 0829ce3..e7c3611 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -17,6 +17,7 @@
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PTHManager.h"
#include "clang/Frontend/ChainedDiagnosticClient.h"
+#include "clang/Frontend/PCHReader.h"
#include "clang/Frontend/TextDiagnosticBuffer.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Frontend/Utils.h"
@@ -164,3 +165,40 @@
/*FreeMemory=*/ !getFrontendOpts().DisableFree,
/*size_reserve=*/ 0));
}
+
+// ExternalASTSource
+
+void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path) {
+ llvm::OwningPtr<ExternalASTSource> Source;
+ Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
+ getPreprocessor(), getASTContext()));
+ getASTContext().setExternalSource(Source);
+}
+
+ExternalASTSource *
+CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
+ const std::string &Sysroot,
+ Preprocessor &PP,
+ ASTContext &Context) {
+ llvm::OwningPtr<PCHReader> Reader;
+ Reader.reset(new PCHReader(PP, &Context,
+ Sysroot.empty() ? 0 : Sysroot.c_str()));
+
+ switch (Reader->ReadPCH(Path)) {
+ case PCHReader::Success:
+ // Set the predefines buffer as suggested by the PCH reader. Typically, the
+ // predefines buffer will be empty.
+ PP.setPredefines(Reader->getSuggestedPredefines());
+ return Reader.take();
+
+ case PCHReader::Failure:
+ // Unrecoverable failure: don't even try to process the input file.
+ break;
+
+ case PCHReader::IgnorePCH:
+ // No suitable PCH file could be found. Return an error.
+ break;
+ }
+
+ return 0;
+}