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llvm-svn: 172962
This commit is contained in:
Michael Gottesman 2013-01-20 05:12:35 +00:00
parent dbf99c2186
commit 267605ce40
1 changed files with 9 additions and 10 deletions
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19
include/llvm/IR/BasicBlock.h
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@ -35,14 +35,13 @@ template<> struct ilist_traits<Instruction>
/// The sentinel is relative to this instance, so we use a non-static
/// method.
Instruction *createSentinel() const {
// since i(p)lists always publicly derive from the corresponding
// traits, placing a data member in this class will augment i(p)list.
// But since the NodeTy is expected to publicly derive from
// ilist_node<NodeTy>, there is a legal viable downcast from it
// to NodeTy. We use this trick to superpose i(p)list with a "ghostly"
// NodeTy, which becomes the sentinel. Dereferencing the sentinel is
// forbidden (save the ilist_node<NodeTy>) so no one will ever notice
// the superposition.
// Since i(p)lists always publicly derive from their corresponding traits,
// placing a data member in this class will augment the i(p)list. But since
// the NodeTy is expected to be publicly derive from ilist_node<NodeTy>,
// there is a legal viable downcast from it to NodeTy. We use this trick to
// superimpose an i(p)list with a "ghostly" NodeTy, which becomes the
// sentinel. Dereferencing the sentinel is forbidden (save the
// ilist_node<NodeTy>), so no one will ever notice the superposition.
return static_cast<Instruction*>(&Sentinel);
}
static void destroySentinel(Instruction*) {}
@ -292,8 +291,8 @@ private:
assert((int)(signed char)getSubclassDataFromValue() >= 0 &&
"Refcount wrap-around");
}
// \brief Shadow Value::setValueSubclassData with a private forwarding method
// so that any future subclasses cannot accidentally use it.
/// \brief Shadow Value::setValueSubclassData with a private forwarding method
/// so that any future subclasses cannot accidentally use it.
void setValueSubclassData(unsigned short D) {
Value::setValueSubclassData(D);
}