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Fix a use-after-free caused by creating DerivedFileUnit on the fly

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Sema was creating DerivedFileUnit on the fly, while something else is iterating
over FileUnits in the module.  The fix is to create DerivedFileUnit in advance.
This change immediately uncovered a lot of code that assumed that the module
consists of a single FileUnit at certain conditions.  This patch also fixes
that code (SourceKit patch is separate, not sending it).

The test change is because now operator == on NSObjects is correctly recognised
as coming from a system module.

rdar://16153700, rdar://16227621, possibly rdar://16049613


Swift SVN r14692
This commit is contained in:
Dmitri Hrybenko
2014-03-05 22:24:25 +00:00
parent f8a29859e5
commit cd48638f9a
5 changed files with 99 additions and 41 deletions
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6
lib/Frontend/Frontend.cpp
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@@ -322,15 +322,15 @@ void CompilerInstance::performParse() {
if (!Invocation.getParseOnly()) {
// Type-check each top-level input besides the main source file.
auto InputSourceFiles = MainModule->getFiles().slice(0, BufferIDs.size());
for (auto File : InputSourceFiles)
for (auto File : MainModule->getFiles())
if (auto SF = dyn_cast<SourceFile>(File))
if (PrimaryBufferID == NO_SUCH_BUFFER ||
(SF->getBufferID().hasValue() &&
SF->getBufferID().getValue() == PrimaryBufferID))
performTypeChecking(*SF, PersistentState.getTopLevelContext());
// If there were no source files, we should still record known protocols.
// Even if there were no source files, we should still record known
// protocols.
if (Context->getStdlibModule())
Context->recordKnownProtocols(Context->getStdlibModule());
}