[ObjCARC] Add an new attribute, objc_externally_retained
This attribute, called "objc_externally_retained", exposes clang's
notion of pseudo-__strong variables in ARC. Pseudo-strong variables
"borrow" their initializer, meaning that they don't retain/release
it, instead assuming that someone else is keeping their value alive.
If a function is annotated with this attribute, implicitly strong
parameters of that function aren't implicitly retained/released in
the function body, and are implicitly const. This is useful to expose
for performance reasons, most functions don't need the extra safety
of the retain/release, so programmers can opt out as needed.
This attribute can also apply to declarations of local variables,
with similar effect.
Differential revision: https://reviews.llvm.org/D55865
llvm-svn: 350422
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 8c1710f..763ab52 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -1350,6 +1350,7 @@
VD->VarDeclBits.SClass = (StorageClass)Record.readInt();
VD->VarDeclBits.TSCSpec = Record.readInt();
VD->VarDeclBits.InitStyle = Record.readInt();
+ VD->VarDeclBits.ARCPseudoStrong = Record.readInt();
if (!isa<ParmVarDecl>(VD)) {
VD->NonParmVarDeclBits.IsThisDeclarationADemotedDefinition =
Record.readInt();
@@ -1357,7 +1358,6 @@
VD->NonParmVarDeclBits.NRVOVariable = Record.readInt();
VD->NonParmVarDeclBits.CXXForRangeDecl = Record.readInt();
VD->NonParmVarDeclBits.ObjCForDecl = Record.readInt();
- VD->NonParmVarDeclBits.ARCPseudoStrong = Record.readInt();
VD->NonParmVarDeclBits.IsInline = Record.readInt();
VD->NonParmVarDeclBits.IsInlineSpecified = Record.readInt();
VD->NonParmVarDeclBits.IsConstexpr = Record.readInt();