//
//===----------------------------------------------------------------------===//
//
-// This file defines the MachineLoopInfo class that is used to identify natural
+// This file defines the MachineLoopInfo class that is used to identify natural
// loops and determine the loop depth of various nodes of the CFG. Note that
// natural loops may actually be several loops that share the same header node.
//
namespace llvm {
-// Provide overrides for Loop methods that don't make sense for machine loops.
-template<> inline
-PHINode *LoopBase<MachineBasicBlock>::getCanonicalInductionVariable() const {
- assert(0 && "getCanonicalInductionVariable not supported for machine loops!");
- return 0;
-}
-
-template<> inline Instruction*
-LoopBase<MachineBasicBlock>::getCanonicalInductionVariableIncrement() const {
- assert(0 &&
- "getCanonicalInductionVariableIncrement not supported for machine loops!");
- return 0;
-}
-
-template<>
-inline bool LoopBase<MachineBasicBlock>::isLoopInvariant(Value *V) const {
- assert(0 && "isLoopInvariant not supported for machine loops!");
- return false;
-}
-
-template<>
-inline Value *LoopBase<MachineBasicBlock>::getTripCount() const {
- assert(0 && "getTripCount not supported for machine loops!");
- return 0;
-}
-
-template<>
-inline bool LoopBase<MachineBasicBlock>::isLCSSAForm() const {
- assert(0 && "isLCSSAForm not supported for machine loops");
- return false;
-}
-
-typedef LoopBase<MachineBasicBlock> MachineLoop;
+// Implementation in LoopInfoImpl.h
+#ifdef __GNUC__
+class MachineLoop;
+__extension__ extern template class LoopBase<MachineBasicBlock, MachineLoop>;
+#endif
+
+class MachineLoop : public LoopBase<MachineBasicBlock, MachineLoop> {
+public:
+ MachineLoop();
+
+ /// getTopBlock - Return the "top" block in the loop, which is the first
+ /// block in the linear layout, ignoring any parts of the loop not
+ /// contiguous with the part the contains the header.
+ MachineBasicBlock *getTopBlock();
+
+ /// getBottomBlock - Return the "bottom" block in the loop, which is the last
+ /// block in the linear layout, ignoring any parts of the loop not
+ /// contiguous with the part the contains the header.
+ MachineBasicBlock *getBottomBlock();
+
+ void dump() const;
+
+private:
+ friend class LoopInfoBase<MachineBasicBlock, MachineLoop>;
+ explicit MachineLoop(MachineBasicBlock *MBB)
+ : LoopBase<MachineBasicBlock, MachineLoop>(MBB) {}
+};
+
+// Implementation in LoopInfoImpl.h
+#ifdef __GNUC__
+__extension__ extern template
+class LoopInfoBase<MachineBasicBlock, MachineLoop>;
+#endif
class MachineLoopInfo : public MachineFunctionPass {
- LoopInfoBase<MachineBasicBlock> LI;
- friend class LoopBase<MachineBasicBlock>;
+ LoopInfoBase<MachineBasicBlock, MachineLoop> LI;
+ friend class LoopBase<MachineBasicBlock, MachineLoop>;
void operator=(const MachineLoopInfo &); // do not implement
MachineLoopInfo(const MachineLoopInfo &); // do not implement
- LoopInfoBase<MachineBasicBlock>& getBase() { return LI; }
-
public:
static char ID; // Pass identification, replacement for typeid
- MachineLoopInfo() : MachineFunctionPass(&ID) {}
+ MachineLoopInfo() : MachineFunctionPass(ID) {
+ initializeMachineLoopInfoPass(*PassRegistry::getPassRegistry());
+ }
+
+ LoopInfoBase<MachineBasicBlock, MachineLoop>& getBase() { return LI; }
/// iterator/begin/end - The interface to the top-level loops in the current
/// function.
///
- typedef LoopInfoBase<MachineBasicBlock>::iterator iterator;
+ typedef LoopInfoBase<MachineBasicBlock, MachineLoop>::iterator iterator;
inline iterator begin() const { return LI.begin(); }
inline iterator end() const { return LI.end(); }
bool empty() const { return LI.empty(); }