http://llvm.org/bugs/show_bug.cgi?id=6006
Summary: Change ContentCache::getBuffer to support failure
properly.
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Basic
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected]
Currently, PCH works by creating file and content cache entries for files in
the PCH, which may not actually exist on disk anymore. There is currently a
huge hack in ContentCache::getBuffer which just manufactures file contents if
the file is ever referenced and turns out not to exist. This should be fixed,
by changing ContentCache::getBuffer to return failures properly. Clients could
then give a nice error about an inconsistent PCH state being detected.
This is a large project, as it involves also adding failure support to all of
the APIs which may transitively use getBuffer, and updating all of their
clients. Notable clients include SourceManager::getCharacterData and
Preprocessor::getSpelling.
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