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block into MachineBasicBlock::getFirstTerminator(). This also fixes a bug in the implementation of the above in both RegAllocLocal and InstrSched, where instructions where added after the terminator if the basic block's only instruction was a terminator (it shouldn't matter for RegAllocLocal since this case never occurs in practice). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11748 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
4.5 KiB
C++
131 lines
4.5 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 "Support/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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class ilist_traits<MachineInstr> {
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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* createNode();
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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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public:
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MachineBasicBlock(const BasicBlock *bb = 0) : Prev(0), Next(0), BB(bb) {
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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;
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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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/// 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 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(iterator &I) { return Insts.remove(I); }
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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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private: // Methods used to maintain doubly linked list of blocks...
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friend class 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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};
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} // End llvm namespace
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#endif
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