namespace llvm {
template<typename NodeTy>
-struct ilist_nextprev_traits;
+struct ilist_traits;
+/// ilist_half_node - Base class that provides prev services for sentinels.
+///
template<typename NodeTy>
-struct ilist_traits;
+class ilist_half_node {
+ friend struct ilist_traits<NodeTy>;
+ NodeTy *Prev;
+protected:
+ NodeTy *getPrev() { return Prev; }
+ const NodeTy *getPrev() const { return Prev; }
+ void setPrev(NodeTy *P) { Prev = P; }
+ ilist_half_node() : Prev(0) {}
+};
+
+template<typename NodeTy>
+struct ilist_nextprev_traits;
/// ilist_node - Base class that provides next/prev services for nodes
/// that use ilist_nextprev_traits or ilist_default_traits.
///
template<typename NodeTy>
-class ilist_node {
-private:
+class ilist_node : ilist_half_node<NodeTy> {
friend struct ilist_nextprev_traits<NodeTy>;
friend struct ilist_traits<NodeTy>;
- NodeTy *Prev, *Next;
- NodeTy *getPrev() { return Prev; }
+ NodeTy *Next;
NodeTy *getNext() { return Next; }
- const NodeTy *getPrev() const { return Prev; }
const NodeTy *getNext() const { return Next; }
- void setPrev(NodeTy *N) { Prev = N; }
void setNext(NodeTy *N) { Next = N; }
protected:
- ilist_node() : Prev(0), Next(0) {}
+ ilist_node() : Next(0) {}
};
+/// When assertions are off, the Next field of sentinels
+/// will not be accessed. So it is not necessary to allocate
+/// space for it. The following macro selects the most
+/// efficient trais class.
+#ifndef NDEBUG
+# define ILIST_NODE ilist_node
+#else
+# define ILIST_NODE ilist_half_node
+#endif
+
} // End llvm namespace
#endif
Instruction *ensureHead(Instruction*) const { return createSentinel(); }
static void noteHead(Instruction*, Instruction*) {}
private:
- mutable ilist_node<Instruction> Sentinel;
+ mutable ILIST_NODE<Instruction> Sentinel;
};
/// This represents a single basic block in LLVM. A basic block is simply a
template <>
struct ilist_traits<MachineBasicBlock>
: public ilist_default_traits<MachineBasicBlock> {
- mutable ilist_node<MachineBasicBlock> Sentinel;
+ mutable ILIST_NODE<MachineBasicBlock> Sentinel;
public:
MachineBasicBlock *createSentinel() const {
return static_cast<MachineBasicBlock*>(&Sentinel);
static ValueSymbolTable *getSymTab(Function *ItemParent);
private:
- mutable ilist_node<BasicBlock> Sentinel;
+ mutable ILIST_NODE<BasicBlock> Sentinel;
};
template<> struct ilist_traits<Argument>
static ValueSymbolTable *getSymTab(Function *ItemParent);
private:
- mutable ilist_node<Argument> Sentinel;
+ mutable ILIST_NODE<Argument> Sentinel;
};
class Function : public GlobalValue, public Annotable,