Improve documentation.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183473 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index f90a609..86b5075 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -1947,13 +1947,19 @@
return Res;
}
-/// Currently the checksum merely consists of the number of ivars.
+/// Currently the checksum of an interface includes the number of
+/// ivars and property accessors.
unsigned CGDebugInfo::Checksum(const ObjCInterfaceDecl
- *InterfaceDecl) {
- unsigned IvarNo = 0;
- for (const ObjCIvarDecl *Ivar = InterfaceDecl->all_declared_ivar_begin();
- Ivar != 0; Ivar = Ivar->getNextIvar()) ++IvarNo;
- return IvarNo;
+ *ID) {
+ // The assumption is that the number of ivars and property accessors
+ // can only increase monotonically, so it is safe to just use the
+ // sum of these as a checksum.
+ unsigned Sum = 0;
+ for (const ObjCIvarDecl *Ivar = ID->all_declared_ivar_begin();
+ Ivar != 0; Ivar = Ivar->getNextIvar())
+ ++Sum;
+
+ return Sum;
}
ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {