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Commit 366985d5 authored by Argyrios Kyrtzidis's avatar Argyrios Kyrtzidis
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Make changes to PCHReader to allow reading a PCH file without having a... 

Make changes to PCHReader to allow reading a PCH file without having a pre-initialized Preprocessor.

-Introduce 'PCHReaderListener' which is an abstract interface for getting various information from the PCHReader.
-If PCHReader is constructed without a Preprocessor, it can still load the file and invoke the callbacks of PCHReaderListener.
-If PCHReader is constructed with an initialized Preprocessor, PCHValidator is used as a PCHReaderListener to validate the contents of the PCH file against the given Preprocessor.

llvm-svn: 73741
parent 095f1a98
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