//
//===----------------------------------------------------------------------===//
//
-//
// This file contains the declaration of the BasicBlock class.
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BASICBLOCK_H
#include "llvm/Instruction.h"
#include "llvm/SymbolTableListTraits.h"
-#include "llvm/ADT/ilist"
+#include "llvm/ADT/ilist.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
class TerminatorInst;
-template <class Term, class BB> class SuccIterator; // Successor Iterator
-template <class Ptr, class USE_iterator> class PredIterator;
template<> struct ilist_traits<Instruction>
: public SymbolTableListTraits<Instruction, BasicBlock> {
/// modifying a program. However, the verifier will ensure that basic blocks
/// are "well formed".
/// @brief LLVM Basic Block Representation
-class BasicBlock : public User { // Basic blocks are data objects also
+class BasicBlock : public Value, // Basic blocks are data objects also
+ public ilist_node<BasicBlock> {
public:
typedef iplist<Instruction> InstListType;
private :
InstListType InstList;
- BasicBlock *Prev, *Next; // Next and Prev links for our intrusive linked list
Function *Parent;
- Use unwindDest;
void setParent(Function *parent);
- void setNext(BasicBlock *N) { Next = N; }
- void setPrev(BasicBlock *N) { Prev = N; }
friend class SymbolTableListTraits<BasicBlock, Function>;
BasicBlock(const BasicBlock &); // Do not implement
void operator=(const BasicBlock &); // Do not implement
-public:
- /// Instruction iterators...
- typedef InstListType::iterator iterator;
- typedef InstListType::const_iterator const_iterator;
-
/// BasicBlock ctor - If the function parameter is specified, the basic block
/// is automatically inserted at either the end of the function (if
/// InsertBefore is null), or before the specified basic block.
///
explicit BasicBlock(const std::string &Name = "", Function *Parent = 0,
- BasicBlock *InsertBefore = 0, BasicBlock *unwindDest = 0);
- ~BasicBlock();
-
- /// getUnwindDest - Returns the BasicBlock that flow will enter if an unwind
- /// instruction occurs in this block. May be null, in which case unwinding
- /// is undefined in this block.
- const BasicBlock *getUnwindDest() const;
- BasicBlock *getUnwindDest();
+ BasicBlock *InsertBefore = 0);
+public:
+ /// Instruction iterators...
+ typedef InstListType::iterator iterator;
+ typedef InstListType::const_iterator const_iterator;
- /// setUnwindDest - Set which BasicBlock flow will enter if an unwind is
- /// executed within this block. It may be set to null if unwinding is not
- /// permitted in this block.
- void setUnwindDest(BasicBlock *unwindDest);
+ /// Create - Creates a new BasicBlock. If the Parent parameter is specified,
+ /// the basic block is automatically inserted at either the end of the
+ /// function (if InsertBefore is 0), or before the specified basic block.
+ static BasicBlock *Create(const std::string &Name = "", Function *Parent = 0,
+ BasicBlock *InsertBefore = 0) {
+ return new BasicBlock(Name, Parent, InsertBefore);
+ }
+ ~BasicBlock();
/// getParent - Return the enclosing method, or null if none
///
const Function *getParent() const { return Parent; }
Function *getParent() { return Parent; }
+ /// use_back - Specialize the methods defined in Value, as we know that an
+ /// BasicBlock can only be used by Instructions (specifically PHI and terms).
+ Instruction *use_back() { return cast<Instruction>(*use_begin());}
+ const Instruction *use_back() const { return cast<Instruction>(*use_begin());}
+
/// getTerminator() - If this is a well formed basic block, then this returns
/// a pointer to the terminator instruction. If it is not, then you get a
/// null pointer back.
/// the first instruction, which might be PHI.
/// Returns 0 is there's no non-PHI instruction.
Instruction* getFirstNonPHI();
+ const Instruction* getFirstNonPHI() const {
+ return const_cast<BasicBlock*>(this)->getFirstNonPHI();
+ }
/// removeFromParent - This method unlinks 'this' from the containing
/// function, but does not delete it.
return const_cast<BasicBlock*>(this)->getSinglePredecessor();
}
+ /// getUniquePredecessor - If this basic block has a unique predecessor block,
+ /// return the block, otherwise return a null pointer.
+ /// Note that unique predecessor doesn't mean single edge, there can be
+ /// multiple edges from the unique predecessor to this block (for example
+ /// a switch statement with multiple cases having the same destination).
+ BasicBlock *getUniquePredecessor();
+ const BasicBlock *getUniquePredecessor() const {
+ return const_cast<BasicBlock*>(this)->getUniquePredecessor();
+ }
+
//===--------------------------------------------------------------------===//
/// Instruction iterator methods
///
const InstListType &getInstList() const { return InstList; }
InstListType &getInstList() { return InstList; }
- virtual void print(std::ostream &OS) const { print(OS, 0); }
- void print(std::ostream *OS) const { if (OS) print(*OS); }
- void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
-
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const BasicBlock *) { return true; }
static inline bool classof(const Value *V) {
/// update the PHI nodes that reside in the block. Note that this should be
/// called while the predecessor still refers to this block.
///
- /// DontDeleteUselessPHIs will keep PHIs that have one value or the same
- /// value for all entries.
- ///
- /// OnlyDeleteOne will only remove one entry from a PHI, in case there were
- /// duplicate entries for the Pred.
- ///
- void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false,
- bool OnlyDeleteOne = false);
+ void removePredecessor(BasicBlock *Pred, bool DontDeleteUselessPHIs = false);
/// splitBasicBlock - This splits a basic block into two at the specified
/// instruction. Note that all instructions BEFORE the specified iterator
BasicBlock *Obj = 0;
return unsigned(reinterpret_cast<uintptr_t>(&Obj->InstList));
}
-
-private:
- // getNext/Prev - Return the next or previous basic block in the list. Access
- // these with Function::iterator.
- BasicBlock *getNext() { return Next; }
- const BasicBlock *getNext() const { return Next; }
- BasicBlock *getPrev() { return Prev; }
- const BasicBlock *getPrev() const { return Prev; }
};
inline int
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