template <>
struct ilist_traits<MachineInstr> : public ilist_default_traits<MachineInstr> {
private:
- mutable ilist_node<MachineInstr> Sentinel;
+ mutable ilist_half_node<MachineInstr> Sentinel;
// this is only set by the MachineBasicBlock owning the LiveList
friend class MachineBasicBlock;
/// exception handler.
bool IsLandingPad;
+ /// AddressTaken - Indicate that this basic block is potentially the
+ /// target of an indirect branch.
+ bool AddressTaken;
+
// Intrusive list support
MachineBasicBlock() {}
public:
/// getBasicBlock - Return the LLVM basic block that this instance
- /// corresponded to originally.
+ /// corresponded to originally. Note that this may be NULL if this instance
+ /// does not correspond directly to an LLVM basic block.
///
const BasicBlock *getBasicBlock() const { return BB; }
+ /// getName - Return the name of the corresponding LLVM basic block, or
+ /// "(null)".
+ StringRef getName() const;
+
+ /// hasAddressTaken - Test whether this block is potentially the target
+ /// of an indirect branch.
+ bool hasAddressTaken() const { return AddressTaken; }
+
+ /// setHasAddressTaken - Set this block to reflect that it potentially
+ /// is the target of an indirect branch.
+ void setHasAddressTaken() { AddressTaken = true; }
+
/// getParent - Return the MachineFunction containing this basic block.
///
const MachineFunction *getParent() const { return xParent; }
/// potential fall-throughs at the end of the block.
void moveBefore(MachineBasicBlock *NewAfter);
void moveAfter(MachineBasicBlock *NewBefore);
-
+
+ /// updateTerminator - Update the terminator instructions in block to account
+ /// for changes to the layout. If the block previously used a fallthrough,
+ /// it may now need a branch, and if it previously used branching it may now
+ /// be able to use a fallthrough.
+ void updateTerminator();
+
// Machine-CFG mutators
/// addSuccessor - Add succ as a successor of this MachineBasicBlock.
/// transferSuccessors - Transfers all the successors from MBB to this
/// machine basic block (i.e., copies all the successors fromMBB and
- /// remove all the successors fromBB).
+ /// remove all the successors from fromMBB).
void transferSuccessors(MachineBasicBlock *fromMBB);
/// isSuccessor - Return true if the specified MBB is a successor of this
/// ends with an unconditional branch to some other block.
bool isLayoutSuccessor(const MachineBasicBlock *MBB) const;
+ /// canFallThrough - Return true if the block can implicitly transfer
+ /// control to the block after it by falling off the end of it. This should
+ /// return false if it can reach the block after it, but it uses an explicit
+ /// branch to do so (e.g., a table jump). True is a conservative answer.
+ bool canFallThrough();
+
/// getFirstTerminator - returns an iterator to the first terminator
/// instruction of this basic block. If a terminator does not exist,
/// it returns end()
MachineBasicBlock *DestB,
bool isCond);
+ /// findDebugLoc - find the next valid DebugLoc starting at MBBI, skipping
+ /// any DEBUG_VALUE instructions. Return UnknownLoc if there is none.
+ DebugLoc findDebugLoc(MachineBasicBlock::iterator &MBBI);
+
// Debugging methods.
void dump() const;
- void print(std::ostream &OS) const;
- void print(std::ostream *OS) const {
- if (OS) print(*OS);
- }
void print(raw_ostream &OS) const;
- void print(raw_ostream *OS) const {
- if (OS) print(*OS);
- }
/// getNumber - MachineBasicBlocks are uniquely numbered at the function
/// level, unless they're not in a MachineFunction yet, in which case this
void removePredecessor(MachineBasicBlock *pred);
};
-std::ostream& operator<<(std::ostream &OS, const MachineBasicBlock &MBB);
raw_ostream& operator<<(raw_ostream &OS, const MachineBasicBlock &MBB);
+void WriteAsOperand(raw_ostream &, const MachineBasicBlock*, bool t);
+
//===--------------------------------------------------------------------===//
// GraphTraits specializations for machine basic block graphs (machine-CFGs)
//===--------------------------------------------------------------------===//