X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FBasicBlock.h;h=2b1c3e0eea708c3a61fc64920ac62979a72e444f;hb=bca81448ac8e19c588c9a4ad16fc70732b76327c;hp=0828e0777c06db823a8be4d0c83086515f1f8b9b;hpb=1f0d48113ca2077c8c6ea1a6d6039eb13623b732;p=oota-llvm.git diff --git a/include/llvm/BasicBlock.h b/include/llvm/BasicBlock.h index 0828e0777c0..2b1c3e0eea7 100644 --- a/include/llvm/BasicBlock.h +++ b/include/llvm/BasicBlock.h @@ -1,96 +1,182 @@ -//===-- llvm/BasicBlock.h - Represent a basic block in the VM ----*- C++ -*--=// +//===-- llvm/BasicBlock.h - Represent a basic block in the VM ---*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file was developed by the LLVM research group and is distributed under +// the University of Illinois Open Source License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// // // 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 +// Note that basic blocks themselves are Value'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. +// 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/Instruction.h" +#include "llvm/SymbolTableListTraits.h" +#include "llvm/ADT/ilist" + +namespace llvm { -class Instruction; -class Method; -class BasicBlock; class TerminatorInst; +template class SuccIterator; // Successor Iterator +template class PredIterator; -typedef UseTy BasicBlockUse; +template<> struct ilist_traits + : public SymbolTableListTraits { + // createSentinel is used to create a node that marks the end of the list... + static Instruction *createSentinel(); + static void destroySentinel(Instruction *I) { delete I; } + static iplist &getList(BasicBlock *BB); +}; class BasicBlock : public Value { // Basic blocks are data objects also public: - typedef ValueHolder InstListType; + typedef iplist InstListType; private : InstListType InstList; + BasicBlock *Prev, *Next; // Next and Prev links for our intrusive linked list + + void setParent(Function *parent); + void setNext(BasicBlock *N) { Next = N; } + void setPrev(BasicBlock *N) { Prev = N; } + friend class SymbolTableListTraits; - friend class ValueHolder; - void setParent(Method *parent); + BasicBlock(const BasicBlock &); // Do not implement + void operator=(const BasicBlock &); // Do not implement public: - BasicBlock(const string &Name = "", Method *Parent = 0); + /// Instruction iterators... + typedef InstListType::iterator iterator; + typedef InstListType::const_iterator const_iterator; + typedef std::reverse_iterator const_reverse_iterator; + typedef std::reverse_iterator reverse_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. + /// + BasicBlock(const std::string &Name = "", Function *Parent = 0, + BasicBlock *InsertBefore = 0); ~BasicBlock(); // Specialize setName to take care of symbol table majik - virtual void setName(const string &name); + virtual void setName(const std::string &name, SymbolTable *ST = 0); - const Method *getParent() const { return (const Method*)InstList.getParent();} - Method *getParent() { return (Method*)InstList.getParent(); } + /// getParent - Return the enclosing method, or null if none + /// + const Function *getParent() const { return InstList.getParent(); } + Function *getParent() { return InstList.getParent(); } - const InstListType &getInstList() const { return InstList; } - InstListType &getInstList() { return InstList; } + // 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. - // + /// 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; + + /// removeFromParent - This method unlinks 'this' from the containing + /// function, but does not delete it. + /// + void removeFromParent(); + + /// eraseFromParent - This method unlinks 'this' from the containing function + /// and deletes it. + /// + void eraseFromParent(); - // 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. - // + + + //===--------------------------------------------------------------------===// + /// Instruction iterator methods + /// + inline iterator begin() { return InstList.begin(); } + inline const_iterator begin() const { return InstList.begin(); } + inline iterator end () { return InstList.end(); } + inline const_iterator end () const { return InstList.end(); } + + inline reverse_iterator rbegin() { return InstList.rbegin(); } + inline const_reverse_iterator rbegin() const { return InstList.rbegin(); } + inline reverse_iterator rend () { return InstList.rend(); } + inline const_reverse_iterator rend () const { return InstList.rend(); } + + inline size_t 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. + /// + 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, AssemblyAnnotationWriter *AAW) 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; + } + + /// 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(); - // 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(InstListType::iterator I); + /// 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). + /// + BasicBlock *splitBasicBlock(iterator I, const std::string &BBName = ""); }; +} // End llvm namespace + #endif