1 //===-- llvm/CodeGen/MachineFunction.h --------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Collect native machine code for a function. This class contains a list of
11 // MachineBasicBlock instances that make up the current compiled function.
13 // This class also contains pointers to various classes which hold
14 // target-specific information about the generated code.
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_CODEGEN_MACHINEFUNCTION_H
19 #define LLVM_CODEGEN_MACHINEFUNCTION_H
21 #include "llvm/ADT/ilist.h"
22 #include "llvm/CodeGen/DebugLoc.h"
23 #include "llvm/CodeGen/MachineBasicBlock.h"
24 #include "llvm/Support/Annotation.h"
25 #include "llvm/Support/Allocator.h"
26 #include "llvm/Support/Recycler.h"
31 class MachineRegisterInfo;
32 class MachineFrameInfo;
33 class MachineConstantPool;
34 class MachineJumpTableInfo;
38 struct ilist_traits<MachineBasicBlock>
39 : public ilist_default_traits<MachineBasicBlock> {
40 mutable ilist_node<MachineBasicBlock> Sentinel;
42 MachineBasicBlock *createSentinel() const {
43 return static_cast<MachineBasicBlock*>(&Sentinel);
45 void destroySentinel(MachineBasicBlock *) const {}
47 MachineBasicBlock *provideInitialHead() const { return createSentinel(); }
48 MachineBasicBlock *ensureHead(MachineBasicBlock*) const {
49 return createSentinel();
52 void addNodeToList(MachineBasicBlock* MBB);
53 void removeNodeFromList(MachineBasicBlock* MBB);
54 void deleteNode(MachineBasicBlock *MBB);
56 void createNode(const MachineBasicBlock &);
59 /// MachineFunctionInfo - This class can be derived from and used by targets to
60 /// hold private target-specific information for each MachineFunction. Objects
61 /// of type are accessed/created with MF::getInfo and destroyed when the
62 /// MachineFunction is destroyed.
63 struct MachineFunctionInfo {
64 virtual ~MachineFunctionInfo() {}
67 class MachineFunction : private Annotation {
69 const TargetMachine &Target;
71 // RegInfo - Information about each register in use in the function.
72 MachineRegisterInfo *RegInfo;
74 // Used to keep track of target-specific per-machine function information for
75 // the target implementation.
76 MachineFunctionInfo *MFInfo;
78 // Keep track of objects allocated on the stack.
79 MachineFrameInfo *FrameInfo;
81 // Keep track of constants which are spilled to memory
82 MachineConstantPool *ConstantPool;
84 // Keep track of jump tables for switch instructions
85 MachineJumpTableInfo *JumpTableInfo;
87 // Function-level unique numbering for MachineBasicBlocks. When a
88 // MachineBasicBlock is inserted into a MachineFunction is it automatically
89 // numbered and this vector keeps track of the mapping from ID's to MBB's.
90 std::vector<MachineBasicBlock*> MBBNumbering;
92 // Pool-allocate MachineFunction-lifetime and IR objects.
93 BumpPtrAllocator Allocator;
95 // Allocation management for instructions in function.
96 Recycler<MachineInstr> InstructionRecycler;
98 // Allocation management for basic blocks in function.
99 Recycler<MachineBasicBlock> BasicBlockRecycler;
101 // List of machine basic blocks in function
102 typedef ilist<MachineBasicBlock> BasicBlockListType;
103 BasicBlockListType BasicBlocks;
105 // Default debug location. Used to print out the debug label at the beginning
107 DebugLoc DefaultDebugLoc;
109 // Tracks debug locations.
110 DebugLocTracker DebugLocInfo;
113 MachineFunction(const Function *Fn, const TargetMachine &TM);
116 /// getFunction - Return the LLVM function that this machine code represents
118 const Function *getFunction() const { return Fn; }
120 /// getTarget - Return the target machine this machine code is compiled with
122 const TargetMachine &getTarget() const { return Target; }
124 /// getRegInfo - Return information about the registers currently in use.
126 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
127 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
129 /// getFrameInfo - Return the frame info object for the current function.
130 /// This object contains information about objects allocated on the stack
131 /// frame of the current function in an abstract way.
133 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
134 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
136 /// getJumpTableInfo - Return the jump table info object for the current
137 /// function. This object contains information about jump tables for switch
138 /// instructions in the current function.
140 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
141 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
143 /// getConstantPool - Return the constant pool object for the current
146 MachineConstantPool *getConstantPool() { return ConstantPool; }
147 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
149 /// MachineFunctionInfo - Keep track of various per-function pieces of
150 /// information for backends that would like to do so.
152 template<typename Ty>
155 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
156 // that apparently breaks GCC 3.3.
157 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
158 AlignOf<Ty>::Alignment));
159 MFInfo = new (Loc) Ty(*this);
162 assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
163 "Invalid concrete type or multiple inheritence for getInfo");
164 return static_cast<Ty*>(MFInfo);
167 template<typename Ty>
168 const Ty *getInfo() const {
169 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
172 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
173 /// are inserted into the machine function. The block number for a machine
174 /// basic block can be found by using the MBB::getBlockNumber method, this
175 /// method provides the inverse mapping.
177 MachineBasicBlock *getBlockNumbered(unsigned N) {
178 assert(N < MBBNumbering.size() && "Illegal block number");
179 assert(MBBNumbering[N] && "Block was removed from the machine function!");
180 return MBBNumbering[N];
183 /// getNumBlockIDs - Return the number of MBB ID's allocated.
185 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
187 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
188 /// recomputes them. This guarantees that the MBB numbers are sequential,
189 /// dense, and match the ordering of the blocks within the function. If a
190 /// specific MachineBasicBlock is specified, only that block and those after
191 /// it are renumbered.
192 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
194 /// print - Print out the MachineFunction in a format suitable for debugging
195 /// to the specified stream.
197 void print(std::ostream &OS) const;
198 void print(std::ostream *OS) const { if (OS) print(*OS); }
200 /// viewCFG - This function is meant for use from the debugger. You can just
201 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
202 /// program, displaying the CFG of the current function with the code for each
203 /// basic block inside. This depends on there being a 'dot' and 'gv' program
206 void viewCFG() const;
208 /// viewCFGOnly - This function is meant for use from the debugger. It works
209 /// just like viewCFG, but it does not include the contents of basic blocks
210 /// into the nodes, just the label. If you are only interested in the CFG
211 /// this can make the graph smaller.
213 void viewCFGOnly() const;
215 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
219 /// construct - Allocate and initialize a MachineFunction for a given Function
222 static MachineFunction& construct(const Function *F, const TargetMachine &TM);
224 /// destruct - Destroy the MachineFunction corresponding to a given Function
226 static void destruct(const Function *F);
228 /// get - Return a handle to a MachineFunction corresponding to the given
229 /// Function. This should not be called before "construct()" for a given
232 static MachineFunction& get(const Function *F);
234 // Provide accessors for the MachineBasicBlock list...
235 typedef BasicBlockListType::iterator iterator;
236 typedef BasicBlockListType::const_iterator const_iterator;
237 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
238 typedef std::reverse_iterator<iterator> reverse_iterator;
240 //===--------------------------------------------------------------------===//
241 // BasicBlock accessor functions.
243 iterator begin() { return BasicBlocks.begin(); }
244 const_iterator begin() const { return BasicBlocks.begin(); }
245 iterator end () { return BasicBlocks.end(); }
246 const_iterator end () const { return BasicBlocks.end(); }
248 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
249 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
250 reverse_iterator rend () { return BasicBlocks.rend(); }
251 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
253 unsigned size() const { return (unsigned)BasicBlocks.size();}
254 bool empty() const { return BasicBlocks.empty(); }
255 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
256 MachineBasicBlock &front() { return BasicBlocks.front(); }
257 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
258 MachineBasicBlock & back() { return BasicBlocks.back(); }
260 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
261 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
262 void insert(iterator MBBI, MachineBasicBlock *MBB) {
263 BasicBlocks.insert(MBBI, MBB);
265 void splice(iterator InsertPt, iterator MBBI) {
266 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
269 void remove(iterator MBBI) {
270 BasicBlocks.remove(MBBI);
272 void erase(iterator MBBI) {
273 BasicBlocks.erase(MBBI);
276 //===--------------------------------------------------------------------===//
277 // Internal functions used to automatically number MachineBasicBlocks
280 /// getNextMBBNumber - Returns the next unique number to be assigned
281 /// to a MachineBasicBlock in this MachineFunction.
283 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
284 MBBNumbering.push_back(MBB);
285 return (unsigned)MBBNumbering.size()-1;
288 /// removeFromMBBNumbering - Remove the specific machine basic block from our
289 /// tracker, this is only really to be used by the MachineBasicBlock
291 void removeFromMBBNumbering(unsigned N) {
292 assert(N < MBBNumbering.size() && "Illegal basic block #");
296 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
297 /// of `new MachineInstr'.
299 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
303 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
304 /// 'Orig' instruction, identical in all ways except the the instruction
305 /// has no parent, prev, or next.
307 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
309 /// DeleteMachineInstr - Delete the given MachineInstr.
311 void DeleteMachineInstr(MachineInstr *MI);
313 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
314 /// instead of `new MachineBasicBlock'.
316 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
318 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
320 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
322 //===--------------------------------------------------------------------===//
326 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
327 /// source file, line, and column. If none currently exists, create a new
328 /// DebugLocTuple, and insert it into the DebugIdMap.
329 unsigned getOrCreateDebugLocID(unsigned Src, unsigned Line, unsigned Col);
331 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
332 DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
334 /// getDefaultDebugLoc - Get the default debug location for the machine
336 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
338 /// setDefaultDebugLoc - Get the default debug location for the machine
340 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
343 //===--------------------------------------------------------------------===//
344 // GraphTraits specializations for function basic block graphs (CFGs)
345 //===--------------------------------------------------------------------===//
347 // Provide specializations of GraphTraits to be able to treat a
348 // machine function as a graph of machine basic blocks... these are
349 // the same as the machine basic block iterators, except that the root
350 // node is implicitly the first node of the function.
352 template <> struct GraphTraits<MachineFunction*> :
353 public GraphTraits<MachineBasicBlock*> {
354 static NodeType *getEntryNode(MachineFunction *F) {
358 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
359 typedef MachineFunction::iterator nodes_iterator;
360 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
361 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
363 template <> struct GraphTraits<const MachineFunction*> :
364 public GraphTraits<const MachineBasicBlock*> {
365 static NodeType *getEntryNode(const MachineFunction *F) {
369 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
370 typedef MachineFunction::const_iterator nodes_iterator;
371 static nodes_iterator nodes_begin(const MachineFunction *F) {
374 static nodes_iterator nodes_end (const MachineFunction *F) {
380 // Provide specializations of GraphTraits to be able to treat a function as a
381 // graph of basic blocks... and to walk it in inverse order. Inverse order for
382 // a function is considered to be when traversing the predecessor edges of a BB
383 // instead of the successor edges.
385 template <> struct GraphTraits<Inverse<MachineFunction*> > :
386 public GraphTraits<Inverse<MachineBasicBlock*> > {
387 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
388 return &G.Graph->front();
391 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
392 public GraphTraits<Inverse<const MachineBasicBlock*> > {
393 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
394 return &G.Graph->front();
398 } // End llvm namespace