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