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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31143 91177308-0d34-0410-b5e6-96231b3b80d8
298 lines
11 KiB
C++
298 lines
11 KiB
C++
//===-- llvm/CodeGen/MachineBasicBlock.h ------------------------*- 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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// Collect the sequence of machine instructions for a basic block.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEBASICBLOCK_H
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#define LLVM_CODEGEN_MACHINEBASICBLOCK_H
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/ilist"
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#include <iosfwd>
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namespace llvm {
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class MachineFunction;
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// ilist_traits
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template <>
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struct ilist_traits<MachineInstr> {
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protected:
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// this is only set by the MachineBasicBlock owning the ilist
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friend class MachineBasicBlock;
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MachineBasicBlock* parent;
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public:
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ilist_traits<MachineInstr>() : parent(0) { }
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static MachineInstr* getPrev(MachineInstr* N) { return N->prev; }
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static MachineInstr* getNext(MachineInstr* N) { return N->next; }
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static const MachineInstr*
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getPrev(const MachineInstr* N) { return N->prev; }
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static const MachineInstr*
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getNext(const MachineInstr* N) { return N->next; }
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static void setPrev(MachineInstr* N, MachineInstr* prev) { N->prev = prev; }
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static void setNext(MachineInstr* N, MachineInstr* next) { N->next = next; }
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static MachineInstr* createSentinel();
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static void destroySentinel(MachineInstr *MI) { delete MI; }
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void addNodeToList(MachineInstr* N);
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void removeNodeFromList(MachineInstr* N);
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void transferNodesFromList(
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iplist<MachineInstr, ilist_traits<MachineInstr> >& toList,
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ilist_iterator<MachineInstr> first,
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ilist_iterator<MachineInstr> last);
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};
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class BasicBlock;
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class MachineBasicBlock {
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public:
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typedef ilist<MachineInstr> Instructions;
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Instructions Insts;
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MachineBasicBlock *Prev, *Next;
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const BasicBlock *BB;
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std::vector<MachineBasicBlock *> Predecessors;
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std::vector<MachineBasicBlock *> Successors;
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int Number;
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MachineFunction *Parent;
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public:
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MachineBasicBlock(const BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb),
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Number(-1), Parent(0) {
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Insts.parent = this;
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}
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~MachineBasicBlock();
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/// getBasicBlock - Return the LLVM basic block that this instance
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/// corresponded to originally.
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///
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const BasicBlock *getBasicBlock() const { return BB; }
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/// getParent - Return the MachineFunction containing this basic block.
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///
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const MachineFunction *getParent() const { return Parent; }
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MachineFunction *getParent() { return Parent; }
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typedef ilist<MachineInstr>::iterator iterator;
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typedef ilist<MachineInstr>::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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unsigned size() const { return Insts.size(); }
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bool empty() const { return Insts.empty(); }
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MachineInstr& front() { return Insts.front(); }
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MachineInstr& back() { return Insts.back(); }
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iterator begin() { return Insts.begin(); }
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const_iterator begin() const { return Insts.begin(); }
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iterator end() { return Insts.end(); }
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const_iterator end() const { return Insts.end(); }
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reverse_iterator rbegin() { return Insts.rbegin(); }
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const_reverse_iterator rbegin() const { return Insts.rbegin(); }
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reverse_iterator rend () { return Insts.rend(); }
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const_reverse_iterator rend () const { return Insts.rend(); }
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// Machine-CFG iterators
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typedef std::vector<MachineBasicBlock *>::iterator pred_iterator;
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typedef std::vector<MachineBasicBlock *>::const_iterator const_pred_iterator;
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typedef std::vector<MachineBasicBlock *>::iterator succ_iterator;
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typedef std::vector<MachineBasicBlock *>::const_iterator const_succ_iterator;
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pred_iterator pred_begin() { return Predecessors.begin(); }
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const_pred_iterator pred_begin() const { return Predecessors.begin(); }
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pred_iterator pred_end() { return Predecessors.end(); }
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const_pred_iterator pred_end() const { return Predecessors.end(); }
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unsigned pred_size() const { return Predecessors.size(); }
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bool pred_empty() const { return Predecessors.empty(); }
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succ_iterator succ_begin() { return Successors.begin(); }
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const_succ_iterator succ_begin() const { return Successors.begin(); }
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succ_iterator succ_end() { return Successors.end(); }
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const_succ_iterator succ_end() const { return Successors.end(); }
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unsigned succ_size() const { return Successors.size(); }
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bool succ_empty() const { return Successors.empty(); }
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// Code Layout methods.
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/// moveBefore/moveAfter - move 'this' block before or after the specified
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/// block. This only moves the block, it does not modify the CFG or adjust
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/// potential fall-throughs at the end of the block.
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void moveBefore(MachineBasicBlock *NewAfter);
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void moveAfter(MachineBasicBlock *NewBefore);
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// Machine-CFG mutators
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/// addSuccessor - Add succ as a successor of this MachineBasicBlock.
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/// The Predecessors list of succ is automatically updated.
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///
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void addSuccessor(MachineBasicBlock *succ);
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/// removeSuccessor - Remove successor from the successors list of this
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/// MachineBasicBlock. The Predecessors list of succ is automatically updated.
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///
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void removeSuccessor(MachineBasicBlock *succ);
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/// removeSuccessor - Remove specified successor from the successors list of
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/// this MachineBasicBlock. The Predecessors list of succ is automatically
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/// updated.
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///
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void removeSuccessor(succ_iterator I);
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/// isSuccessor - Return true if the specified MBB is a successor of this
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/// block.
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bool isSuccessor(MachineBasicBlock *MBB) const {
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for (const_succ_iterator I = succ_begin(), E = succ_end(); I != E; ++I)
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if (*I == MBB)
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return true;
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return false;
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}
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/// getFirstTerminator - returns an iterator to the first terminator
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/// instruction of this basic block. If a terminator does not exist,
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/// it returns end()
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iterator getFirstTerminator();
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void pop_front() { Insts.pop_front(); }
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void pop_back() { Insts.pop_back(); }
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void push_back(MachineInstr *MI) { Insts.push_back(MI); }
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template<typename IT>
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void insert(iterator I, IT S, IT E) { Insts.insert(I, S, E); }
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iterator insert(iterator I, MachineInstr *M) { return Insts.insert(I, M); }
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// erase - Remove the specified element or range from the instruction list.
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// These functions delete any instructions removed.
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//
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iterator erase(iterator I) { return Insts.erase(I); }
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iterator erase(iterator I, iterator E) { return Insts.erase(I, E); }
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MachineInstr *remove(MachineInstr *I) { return Insts.remove(I); }
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void clear() { Insts.clear(); }
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/// splice - Take a block of instructions from MBB 'Other' in the range [From,
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/// To), and insert them into this MBB right before 'where'.
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void splice(iterator where, MachineBasicBlock *Other, iterator From,
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iterator To) {
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Insts.splice(where, Other->Insts, From, To);
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}
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// Debugging methods.
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void dump() const;
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void print(std::ostream &OS) const;
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/// getNumber - MachineBasicBlocks are uniquely numbered at the function
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/// level, unless they're not in a MachineFunction yet, in which case this
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/// will return -1.
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///
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int getNumber() const { return Number; }
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void setNumber(int N) { Number = N; }
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private: // Methods used to maintain doubly linked list of blocks...
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friend struct ilist_traits<MachineBasicBlock>;
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MachineBasicBlock *getPrev() const { return Prev; }
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MachineBasicBlock *getNext() const { return Next; }
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void setPrev(MachineBasicBlock *P) { Prev = P; }
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void setNext(MachineBasicBlock *N) { Next = N; }
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// Machine-CFG mutators
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/// addPredecessor - Remove pred as a predecessor of this MachineBasicBlock.
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/// Don't do this unless you know what you're doing, because it doesn't
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/// update pred's successors list. Use pred->addSuccessor instead.
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///
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void addPredecessor(MachineBasicBlock *pred);
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/// removePredecessor - Remove pred as a predecessor of this
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/// MachineBasicBlock. Don't do this unless you know what you're
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/// doing, because it doesn't update pred's successors list. Use
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/// pred->removeSuccessor instead.
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///
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void removePredecessor(MachineBasicBlock *pred);
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};
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//===--------------------------------------------------------------------===//
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// GraphTraits specializations for machine basic block graphs (machine-CFGs)
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//===--------------------------------------------------------------------===//
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// Provide specializations of GraphTraits to be able to treat a
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// MachineFunction as a graph of MachineBasicBlocks...
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//
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template <> struct GraphTraits<MachineBasicBlock *> {
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typedef MachineBasicBlock NodeType;
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typedef MachineBasicBlock::succ_iterator ChildIteratorType;
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static NodeType *getEntryNode(MachineBasicBlock *BB) { return BB; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->succ_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->succ_end();
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}
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};
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template <> struct GraphTraits<const MachineBasicBlock *> {
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typedef const MachineBasicBlock NodeType;
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typedef MachineBasicBlock::const_succ_iterator ChildIteratorType;
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static NodeType *getEntryNode(const MachineBasicBlock *BB) { return BB; }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->succ_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->succ_end();
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}
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};
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// Provide specializations of GraphTraits to be able to treat a
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// MachineFunction as a graph of MachineBasicBlocks... and to walk it
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// in inverse order. Inverse order for a function is considered
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// to be when traversing the predecessor edges of a MBB
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// instead of the successor edges.
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//
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template <> struct GraphTraits<Inverse<MachineBasicBlock*> > {
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typedef MachineBasicBlock NodeType;
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typedef MachineBasicBlock::pred_iterator ChildIteratorType;
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static NodeType *getEntryNode(Inverse<MachineBasicBlock *> G) {
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return G.Graph;
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}
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->pred_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->pred_end();
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}
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};
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template <> struct GraphTraits<Inverse<const MachineBasicBlock*> > {
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typedef const MachineBasicBlock NodeType;
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typedef MachineBasicBlock::const_pred_iterator ChildIteratorType;
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static NodeType *getEntryNode(Inverse<const MachineBasicBlock*> G) {
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return G.Graph;
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}
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->pred_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->pred_end();
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}
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};
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} // End llvm namespace
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#endif
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