-fms-extensions: Implement half of #pragma init_seg
Summary:
This pragma is very rare. We could *hypothetically* lower some uses of
it down to @llvm.global_ctors, but given that GlobalOpt isn't able to
optimize prioritized global ctors today, there's really no point.
If we wanted to do this in the future, I would check if the section used
in the pragma started with ".CRT$XC" and had up to two characters after
it. Those two characters could form the 16-bit initialization priority
that we support in @llvm.global_ctors. We would have to teach LLVM to
lower prioritized global ctors on COFF as well.
This should let us compile some silly uses of this pragma in WebKit /
Blink.
Reviewers: rsmith, majnemer
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D4549
llvm-svn: 213593
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 3e930f4..bbe6930 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9125,6 +9125,13 @@
if (const SectionAttr *SA = var->getAttr<SectionAttr>())
if (UnifySection(SA->getName(), SectionFlags, var))
var->dropAttr<SectionAttr>();
+
+ // Apply the init_seg attribute if this has an initializer. If the
+ // initializer turns out to not be dynamic, we'll end up ignoring this
+ // attribute.
+ if (CurInitSeg && var->getInit())
+ var->addAttr(InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(),
+ CurInitSegLoc));
}
// All the following checks are C++ only.