//===-- llvm/BasicBlock.h - Represent a basic block in the VM ----*- C++ -*--=//
-//
-// This file contains the declaration of the BasicBlock class, which represents
-// a single basic block in the VM.
-//
-// Note that basic blocks themselves are Def's, because they are referenced
-// by instructions like branches and can go in switch tables and stuff...
-//
-// This may see wierd at first, but it's really pretty cool. :)
-//
-//===----------------------------------------------------------------------===//
-//
-// Note that well formed basic blocks are formed of a list of instructions
-// followed by a single TerminatorInst instruction. TerminatorInst's may not
-// occur in the middle of basic blocks, and must terminate the blocks.
-//
-// This code allows malformed basic blocks to occur, because it may be useful
-// in the intermediate stage of analysis or modification of a program.
-//
+///
+/// \class BasicBlock
+///
+/// This file contains the declaration of the BasicBlock class, which represents
+/// a single basic block in the VM.
+///
+/// Note that basic blocks themselves are Value's, because they are referenced
+/// by instructions like branches and can go in switch tables and stuff...
+///
+///===---------------------------------------------------------------------===//
+///
+/// Note that well formed basic blocks are formed of a list of instructions
+/// followed by a single TerminatorInst instruction. TerminatorInst's may not
+/// occur in the middle of basic blocks, and must terminate the blocks.
+///
+/// This code allows malformed basic blocks to occur, because it may be useful
+/// in the intermediate stage modification to a program.
+///
//===----------------------------------------------------------------------===//
#ifndef LLVM_BASICBLOCK_H
#define LLVM_BASICBLOCK_H
-#include "llvm/Value.h" // Get the definition of Value
-#include "llvm/ValueHolder.h"
-#include "llvm/CFGdecls.h"
+#include "llvm/Instruction.h"
+#include "llvm/SymbolTableListTraits.h"
+#include "Support/ilist"
-class Instruction;
-class Method;
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, Function> {
+ // createNode is used to create a node that marks the end of the list...
+ static Instruction *createNode();
+ static iplist<Instruction> &getList(BasicBlock *BB);
+};
class BasicBlock : public Value { // Basic blocks are data objects also
public:
- typedef ValueHolder<Instruction, BasicBlock> InstListType;
+ typedef iplist<Instruction> InstListType;
private :
InstListType InstList;
+ BasicBlock *Prev, *Next; // Next and Prev links for our intrusive linked list
- friend class ValueHolder<BasicBlock,Method>;
- void setParent(Method *parent);
+ void setParent(Function *parent);
+ void setNext(BasicBlock *N) { Next = N; }
+ void setPrev(BasicBlock *N) { Prev = N; }
+ friend class SymbolTableListTraits<BasicBlock, Function, Function>;
+
+ BasicBlock(const BasicBlock &); // Do not implement
+ void operator=(const BasicBlock &); // Do not implement
public:
- // Instruction iterators...
+ /// Instruction iterators...
typedef InstListType::iterator iterator;
typedef InstListType::const_iterator const_iterator;
- typedef reverse_iterator<const_iterator> const_reverse_iterator;
- typedef reverse_iterator<iterator> reverse_iterator;
-
- typedef cfg::succ_iterator succ_iterator; // Include CFG.h to use these
- typedef cfg::pred_iterator pred_iterator;
- typedef cfg::succ_const_iterator succ_const_iterator;
- typedef cfg::pred_const_iterator pred_const_iterator;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
- BasicBlock(const string &Name = "", Method *Parent = 0);
+ /// BasicBlock ctor - If the function parameter is specified, the basic block
+ /// is automatically inserted at the end of the function.
+ ///
+ BasicBlock(const std::string &Name = "", Function *Parent = 0);
~BasicBlock();
// Specialize setName to take care of symbol table majik
- virtual void setName(const string &name);
-
- const Method *getParent() const { return (const Method*)InstList.getParent();}
- Method *getParent() { return (Method*)InstList.getParent(); }
-
- // 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.
- //
+ virtual void setName(const std::string &name, SymbolTable *ST = 0);
+
+ /// getParent - Return the enclosing method, or null if none
+ ///
+ const Function *getParent() const { return InstList.getParent(); }
+ Function *getParent() { return InstList.getParent(); }
+
+ // getNext/Prev - Return the next or previous basic block in the list.
+ BasicBlock *getNext() { return Next; }
+ const BasicBlock *getNext() const { return Next; }
+ BasicBlock *getPrev() { return Prev; }
+ const BasicBlock *getPrev() const { return Prev; }
+
+ /// 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 *const getTerminator() const;
-
+
+ // Provide a scoped predecessor and successor iterator
+ typedef PredIterator<BasicBlock, Value::use_iterator> pred_iterator;
+ typedef PredIterator<const BasicBlock,
+ Value::use_const_iterator> pred_const_iterator;
+
+ typedef SuccIterator<TerminatorInst*, BasicBlock> succ_iterator;
+ typedef SuccIterator<const TerminatorInst*,
+ const BasicBlock> succ_const_iterator;
+
+
//===--------------------------------------------------------------------===//
- // Instruction iterator methods
+ /// Instruction iterator methods
+ ///
inline iterator begin() { return InstList.begin(); }
inline const_iterator begin() const { return InstList.begin(); }
inline iterator end () { return InstList.end(); }
inline unsigned size() const { return InstList.size(); }
inline bool empty() const { return InstList.empty(); }
- inline const Instruction *front() const { return InstList.front(); }
- inline Instruction *front() { return InstList.front(); }
- inline const Instruction *back() const { return InstList.back(); }
- inline Instruction *back() { return InstList.back(); }
-
- // getInstList() - Return the underlying instruction list container. You need
- // to access it directly if you want to modify it currently.
- //
+ inline const Instruction &front() const { return InstList.front(); }
+ inline Instruction &front() { return InstList.front(); }
+ inline const Instruction &back() const { return InstList.back(); }
+ inline Instruction &back() { return InstList.back(); }
+
+ /// getInstList() - Return the underlying instruction list container. You
+ /// need to access it directly if you want to modify it currently.
+ ///
const InstListType &getInstList() const { return InstList; }
InstListType &getInstList() { return InstList; }
- // hasConstantPoolReferences() - This predicate is true if there is a
- // reference to this basic block in the constant pool for this method. For
- // example, if a block is reached through a switch table, that table resides
- // in the constant pool, and the basic block is reference from it.
- //
- bool hasConstantPoolReferences() const;
-
- // dropAllReferences() - This function causes all the subinstructions to "let
- // go" of all references that they are maintaining. This allows one to
- // 'delete' a whole class at a time, even though there may be circular
- // references... first all references are dropped, and all use counts go to
- // zero. Then everything is delete'd for real. Note that no operations are
- // valid on an object that has "dropped all references", except operator
- // delete.
- //
+ virtual void print(std::ostream &OS) const;
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const BasicBlock *BB) { return true; }
+ static inline bool classof(const Value *V) {
+ return V->getValueType() == Value::BasicBlockVal;
+ }
+
+ /// hasConstantReferences() - This predicate is true if there is a
+ /// reference to this basic block in the constant pool for this method. For
+ /// example, if a block is reached through a switch table, that table resides
+ /// in the constant pool, and the basic block is reference from it.
+ ///
+ bool hasConstantReferences() const;
+
+ /// dropAllReferences() - This function causes all the subinstructions to "let
+ /// go" of all references that they are maintaining. This allows one to
+ /// 'delete' a whole class at a time, even though there may be circular
+ /// references... first all references are dropped, and all use counts go to
+ /// zero. Then everything is delete'd for real. Note that no operations are
+ /// valid on an object that has "dropped all references", except operator
+ /// delete.
+ ///
void dropAllReferences();
- // removePredecessor - This method is used to notify a BasicBlock that the
- // specified Predecessor of the block is no longer able to reach it. This is
- // actually not used to update the Predecessor list, but is actually used to
- // update the PHI nodes that reside in the block. Note that this should be
- // called while the predecessor still refers to this block.
- //
+ /// removePredecessor - This method is used to notify a BasicBlock that the
+ /// specified Predecessor of the block is no longer able to reach it. This is
+ /// actually not used to update the Predecessor list, but is actually used to
+ /// update the PHI nodes that reside in the block. Note that this should be
+ /// called while the predecessor still refers to this block.
+ ///
void removePredecessor(BasicBlock *Pred);
- // splitBasicBlock - This splits a basic block into two at the specified
- // instruction. Note that all instructions BEFORE the specified iterator stay
- // as part of the original basic block, an unconditional branch is added to
- // the new BB, and the rest of the instructions in the BB are moved to the new
- // BB, including the old terminator. The newly formed BasicBlock is returned.
- // This function invalidates the specified iterator.
- //
- // Note that this only works on well formed basic blocks (must have a
- // terminator), and 'I' must not be the end of instruction list (which would
- // cause a degenerate basic block to be formed, having a terminator inside of
- // the basic block).
- //
+ /// splitBasicBlock - This splits a basic block into two at the specified
+ /// instruction. Note that all instructions BEFORE the specified iterator
+ /// stay as part of the original basic block, an unconditional branch is added
+ /// to the new BB, and the rest of the instructions in the BB are moved to the
+ /// new BB, including the old terminator. The newly formed BasicBlock is
+ /// returned. This function invalidates the specified iterator.
+ ///
+ /// Note that this only works on well formed basic blocks (must have a
+ /// terminator), and 'I' must not be the end of instruction list (which would
+ /// cause a degenerate basic block to be formed, having a terminator inside of
+ /// the basic block).
+ ///
BasicBlock *splitBasicBlock(iterator I);
};
projects / oota-llvm.git / blobdiff