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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17831 91177308-0d34-0410-b5e6-96231b3b80d8
182 lines
7.7 KiB
C++
182 lines
7.7 KiB
C++
//===-- llvm/BasicBlock.h - Represent a basic block in the VM ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//
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// This file contains the declaration of the BasicBlock class, which represents
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// a single basic block in the VM.
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//
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// Note that basic blocks themselves are Value's, because they are referenced
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// by instructions like branches and can go in switch tables and stuff...
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//
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///===---------------------------------------------------------------------===//
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//
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// Note that well formed basic blocks are formed of a list of instructions
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// followed by a single TerminatorInst instruction. TerminatorInst's may not
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// occur in the middle of basic blocks, and must terminate the blocks.
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//
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// This code allows malformed basic blocks to occur, because it may be useful
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// in the intermediate stage modification to a program.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BASICBLOCK_H
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#define LLVM_BASICBLOCK_H
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#include "llvm/Instruction.h"
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#include "llvm/SymbolTableListTraits.h"
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#include "llvm/ADT/ilist"
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namespace llvm {
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class TerminatorInst;
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template <class Term, class BB> class SuccIterator; // Successor Iterator
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template <class Ptr, class USE_iterator> class PredIterator;
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template<> struct ilist_traits<Instruction>
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: public SymbolTableListTraits<Instruction, BasicBlock, Function> {
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// createNode is used to create a node that marks the end of the list...
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static Instruction *createNode();
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static iplist<Instruction> &getList(BasicBlock *BB);
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};
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class BasicBlock : public Value { // Basic blocks are data objects also
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public:
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typedef iplist<Instruction> InstListType;
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private :
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InstListType InstList;
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BasicBlock *Prev, *Next; // Next and Prev links for our intrusive linked list
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void setParent(Function *parent);
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void setNext(BasicBlock *N) { Next = N; }
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void setPrev(BasicBlock *N) { Prev = N; }
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friend class SymbolTableListTraits<BasicBlock, Function, Function>;
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BasicBlock(const BasicBlock &); // Do not implement
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void operator=(const BasicBlock &); // Do not implement
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public:
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/// Instruction iterators...
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typedef InstListType::iterator iterator;
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typedef InstListType::const_iterator const_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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typedef std::reverse_iterator<iterator> reverse_iterator;
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/// BasicBlock ctor - If the function parameter is specified, the basic block
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/// is automatically inserted at either the end of the function (if
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/// InsertBefore is null), or before the specified basic block.
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///
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BasicBlock(const std::string &Name = "", Function *Parent = 0,
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BasicBlock *InsertBefore = 0);
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~BasicBlock();
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// Specialize setName to take care of symbol table majik
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virtual void setName(const std::string &name, SymbolTable *ST = 0);
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/// getParent - Return the enclosing method, or null if none
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///
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const Function *getParent() const { return InstList.getParent(); }
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Function *getParent() { return InstList.getParent(); }
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// getNext/Prev - Return the next or previous basic block in the list.
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BasicBlock *getNext() { return Next; }
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const BasicBlock *getNext() const { return Next; }
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BasicBlock *getPrev() { return Prev; }
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const BasicBlock *getPrev() const { return Prev; }
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/// getTerminator() - If this is a well formed basic block, then this returns
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/// a pointer to the terminator instruction. If it is not, then you get a
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/// null pointer back.
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///
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TerminatorInst *getTerminator();
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const TerminatorInst *const getTerminator() const;
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/// removeFromParent - This method unlinks 'this' from the containing
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/// function, but does not delete it.
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///
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void removeFromParent();
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/// eraseFromParent - This method unlinks 'this' from the containing function
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/// and deletes it.
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///
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void eraseFromParent();
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//===--------------------------------------------------------------------===//
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/// Instruction iterator methods
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///
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inline iterator begin() { return InstList.begin(); }
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inline const_iterator begin() const { return InstList.begin(); }
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inline iterator end () { return InstList.end(); }
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inline const_iterator end () const { return InstList.end(); }
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inline reverse_iterator rbegin() { return InstList.rbegin(); }
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inline const_reverse_iterator rbegin() const { return InstList.rbegin(); }
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inline reverse_iterator rend () { return InstList.rend(); }
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inline const_reverse_iterator rend () const { return InstList.rend(); }
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inline size_t size() const { return InstList.size(); }
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inline bool empty() const { return InstList.empty(); }
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inline const Instruction &front() const { return InstList.front(); }
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inline Instruction &front() { return InstList.front(); }
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inline const Instruction &back() const { return InstList.back(); }
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inline Instruction &back() { return InstList.back(); }
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/// getInstList() - Return the underlying instruction list container. You
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/// need to access it directly if you want to modify it currently.
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///
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const InstListType &getInstList() const { return InstList; }
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InstListType &getInstList() { return InstList; }
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virtual void print(std::ostream &OS) const { print(OS, 0); }
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void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const BasicBlock *BB) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::BasicBlockVal;
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}
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/// dropAllReferences() - This function causes all the subinstructions to "let
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/// go" of all references that they are maintaining. This allows one to
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/// 'delete' a whole class at a time, even though there may be circular
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/// references... first all references are dropped, and all use counts go to
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/// zero. Then everything is delete'd for real. Note that no operations are
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/// valid on an object that has "dropped all references", except operator
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/// delete.
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///
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void dropAllReferences();
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/// removePredecessor - This method is used to notify a BasicBlock that the
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/// specified Predecessor of the block is no longer able to reach it. This is
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/// actually not used to update the Predecessor list, but is actually used to
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/// update the PHI nodes that reside in the block. Note that this should be
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/// called while the predecessor still refers to this block.
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///
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void removePredecessor(BasicBlock *Pred);
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/// splitBasicBlock - This splits a basic block into two at the specified
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/// instruction. Note that all instructions BEFORE the specified iterator
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/// stay as part of the original basic block, an unconditional branch is added
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/// to the new BB, and the rest of the instructions in the BB are moved to the
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/// new BB, including the old terminator. The newly formed BasicBlock is
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/// returned. This function invalidates the specified iterator.
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///
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/// Note that this only works on well formed basic blocks (must have a
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/// terminator), and 'I' must not be the end of instruction list (which would
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/// cause a degenerate basic block to be formed, having a terminator inside of
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/// the basic block).
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///
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BasicBlock *splitBasicBlock(iterator I, const std::string &BBName = "");
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};
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} // End llvm namespace
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#endif
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