#include "llvm/Instruction.h"
#include "llvm/SymbolTableListTraits.h"
#include "llvm/ADT/ilist.h"
-#include "llvm/System/DataTypes.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/DataTypes.h"
namespace llvm {
/// tables. The type of a BasicBlock is "Type::LabelTy" because the basic block
/// represents a label to which a branch can jump.
///
-/// A well formed basic block is formed of a list of non-terminating
-/// instructions followed by a single TerminatorInst instruction.
-/// TerminatorInst's may not occur in the middle of basic blocks, and must
+/// A well formed basic block is formed of a list of non-terminating
+/// instructions followed by a single TerminatorInst instruction.
+/// TerminatorInst's may not occur in the middle of basic blocks, and must
/// terminate the blocks. The BasicBlock class allows malformed basic blocks to
/// occur because it may be useful in the intermediate stage of constructing or
/// modifying a program. However, the verifier will ensure that basic blocks
public:
/// getContext - Get the context in which this basic block lives.
LLVMContext &getContext() const;
-
+
/// Instruction iterators...
typedef InstListType::iterator iterator;
typedef InstListType::const_iterator const_iterator;
/// 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(LLVMContext &Context, const Twine &Name = "",
+ static BasicBlock *Create(LLVMContext &Context, const Twine &Name = "",
Function *Parent = 0,BasicBlock *InsertBefore = 0) {
return new BasicBlock(Context, Name, Parent, InsertBefore);
}
Function *getParent() { return Parent; }
/// use_back - Specialize the methods defined in Value, as we know that an
- /// BasicBlock can only be used by Users (specifically PHI nodes, terminators,
+ /// BasicBlock can only be used by Users (specifically terminators
/// and BlockAddress's).
User *use_back() { return cast<User>(*use_begin());}
const User *use_back() const { return cast<User>(*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.
///
TerminatorInst *getTerminator();
const TerminatorInst *getTerminator() const;
-
- /// Returns a pointer to the first instructon in this block that is not a
+
+ /// Returns a pointer to the first instructon in this block that is not a
/// PHINode instruction. When adding instruction to the beginning of the
/// basic block, they should be added before the returned value, not before
/// the first instruction, which might be PHI.
const Instruction* getFirstNonPHI() const {
return const_cast<BasicBlock*>(this)->getFirstNonPHI();
}
-
+
+ // Same as above, but also skip debug intrinsics.
+ Instruction* getFirstNonPHIOrDbg();
+ const Instruction* getFirstNonPHIOrDbg() const {
+ return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbg();
+ }
+
+ // Same as above, but also skip lifetime intrinsics.
+ Instruction* getFirstNonPHIOrDbgOrLifetime();
+ const Instruction* getFirstNonPHIOrDbgOrLifetime() const {
+ return const_cast<BasicBlock*>(this)->getFirstNonPHIOrDbgOrLifetime();
+ }
+
/// removeFromParent - This method unlinks 'this' from the containing
/// function, but does not delete it.
///
/// and deletes it.
///
void eraseFromParent();
-
+
/// moveBefore - Unlink this basic block from its current function and
/// insert it into the function that MovePos lives in, right before MovePos.
void moveBefore(BasicBlock *MovePos);
-
+
/// moveAfter - Unlink this basic block from its current function and
/// insert it into the function that MovePos lives in, right after MovePos.
void moveAfter(BasicBlock *MovePos);
-
+
/// getSinglePredecessor - If this basic block has a single predecessor block,
/// return the block, otherwise return a null pointer.
/// 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
+ /// 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 {
/// hasAddressTaken - returns true if there are any uses of this basic block
/// other than direct branches, switches, etc. to it.
- bool hasAddressTaken() const { return SubclassData != 0; }
-
+ bool hasAddressTaken() const { return getSubclassDataFromValue() != 0; }
+
+ /// replaceSuccessorsPhiUsesWith - Update all phi nodes in all our successors
+ /// to refer to basic block New instead of to us.
+ void replaceSuccessorsPhiUsesWith(BasicBlock *New);
+
private:
/// AdjustBlockAddressRefCount - BasicBlock stores the number of BlockAddress
/// objects using it. This is almost always 0, sometimes one, possibly but
/// almost never 2, and inconceivably 3 or more.
void AdjustBlockAddressRefCount(int Amt) {
- SubclassData += Amt;
- assert((int)(char)SubclassData >= 0 && "Refcount wrap-around");
+ setValueSubclassData(getSubclassDataFromValue()+Amt);
+ assert((int)(signed char)getSubclassDataFromValue() >= 0 &&
+ "Refcount wrap-around");
+ }
+ // 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);
}
};
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