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 void addNodeToList(MachineBasicBlock* MBB);
48 void removeNodeFromList(MachineBasicBlock* MBB);
49 void deleteNode(MachineBasicBlock *MBB);
51 void createNode(const MachineBasicBlock &);
54 /// MachineFunctionInfo - This class can be derived from and used by targets to
55 /// hold private target-specific information for each MachineFunction. Objects
56 /// of type are accessed/created with MF::getInfo and destroyed when the
57 /// MachineFunction is destroyed.
58 struct MachineFunctionInfo {
59 virtual ~MachineFunctionInfo() {}
62 class MachineFunction : private Annotation {
64 const TargetMachine &Target;
66 // RegInfo - Information about each register in use in the function.
67 MachineRegisterInfo *RegInfo;
69 // Used to keep track of target-specific per-machine function information for
70 // the target implementation.
71 MachineFunctionInfo *MFInfo;
73 // Keep track of objects allocated on the stack.
74 MachineFrameInfo *FrameInfo;
76 // Keep track of constants which are spilled to memory
77 MachineConstantPool *ConstantPool;
79 // Keep track of jump tables for switch instructions
80 MachineJumpTableInfo *JumpTableInfo;
82 // Function-level unique numbering for MachineBasicBlocks. When a
83 // MachineBasicBlock is inserted into a MachineFunction is it automatically
84 // numbered and this vector keeps track of the mapping from ID's to MBB's.
85 std::vector<MachineBasicBlock*> MBBNumbering;
87 // Pool-allocate MachineFunction-lifetime and IR objects.
88 BumpPtrAllocator Allocator;
90 // Allocation management for instructions in function.
91 Recycler<MachineInstr> InstructionRecycler;
93 // Allocation management for basic blocks in function.
94 Recycler<MachineBasicBlock> BasicBlockRecycler;
96 // List of machine basic blocks in function
97 typedef ilist<MachineBasicBlock> BasicBlockListType;
98 BasicBlockListType BasicBlocks;
100 // Default debug location. Used to print out the debug label at the beginning
102 DebugLoc DefaultDebugLoc;
104 // Tracks debug locations.
105 DebugLocTracker DebugLocInfo;
108 MachineFunction(const Function *Fn, const TargetMachine &TM);
111 /// getFunction - Return the LLVM function that this machine code represents
113 const Function *getFunction() const { return Fn; }
115 /// getTarget - Return the target machine this machine code is compiled with
117 const TargetMachine &getTarget() const { return Target; }
119 /// getRegInfo - Return information about the registers currently in use.
121 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
122 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
124 /// getFrameInfo - Return the frame info object for the current function.
125 /// This object contains information about objects allocated on the stack
126 /// frame of the current function in an abstract way.
128 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
129 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
131 /// getJumpTableInfo - Return the jump table info object for the current
132 /// function. This object contains information about jump tables for switch
133 /// instructions in the current function.
135 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
136 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
138 /// getConstantPool - Return the constant pool object for the current
141 MachineConstantPool *getConstantPool() { return ConstantPool; }
142 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
144 /// MachineFunctionInfo - Keep track of various per-function pieces of
145 /// information for backends that would like to do so.
147 template<typename Ty>
150 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
151 // that apparently breaks GCC 3.3.
152 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
153 AlignOf<Ty>::Alignment));
154 MFInfo = new (Loc) Ty(*this);
157 assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
158 "Invalid concrete type or multiple inheritence for getInfo");
159 return static_cast<Ty*>(MFInfo);
162 template<typename Ty>
163 const Ty *getInfo() const {
164 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
167 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
168 /// are inserted into the machine function. The block number for a machine
169 /// basic block can be found by using the MBB::getBlockNumber method, this
170 /// method provides the inverse mapping.
172 MachineBasicBlock *getBlockNumbered(unsigned N) {
173 assert(N < MBBNumbering.size() && "Illegal block number");
174 assert(MBBNumbering[N] && "Block was removed from the machine function!");
175 return MBBNumbering[N];
178 /// getNumBlockIDs - Return the number of MBB ID's allocated.
180 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
182 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
183 /// recomputes them. This guarantees that the MBB numbers are sequential,
184 /// dense, and match the ordering of the blocks within the function. If a
185 /// specific MachineBasicBlock is specified, only that block and those after
186 /// it are renumbered.
187 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
189 /// print - Print out the MachineFunction in a format suitable for debugging
190 /// to the specified stream.
192 void print(std::ostream &OS) const;
193 void print(std::ostream *OS) const { if (OS) print(*OS); }
195 /// viewCFG - This function is meant for use from the debugger. You can just
196 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
197 /// program, displaying the CFG of the current function with the code for each
198 /// basic block inside. This depends on there being a 'dot' and 'gv' program
201 void viewCFG() const;
203 /// viewCFGOnly - This function is meant for use from the debugger. It works
204 /// just like viewCFG, but it does not include the contents of basic blocks
205 /// into the nodes, just the label. If you are only interested in the CFG
206 /// this can make the graph smaller.
208 void viewCFGOnly() const;
210 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
214 /// construct - Allocate and initialize a MachineFunction for a given Function
217 static MachineFunction& construct(const Function *F, const TargetMachine &TM);
219 /// destruct - Destroy the MachineFunction corresponding to a given Function
221 static void destruct(const Function *F);
223 /// get - Return a handle to a MachineFunction corresponding to the given
224 /// Function. This should not be called before "construct()" for a given
227 static MachineFunction& get(const Function *F);
229 // Provide accessors for the MachineBasicBlock list...
230 typedef BasicBlockListType::iterator iterator;
231 typedef BasicBlockListType::const_iterator const_iterator;
232 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
233 typedef std::reverse_iterator<iterator> reverse_iterator;
235 //===--------------------------------------------------------------------===//
236 // BasicBlock accessor functions.
238 iterator begin() { return BasicBlocks.begin(); }
239 const_iterator begin() const { return BasicBlocks.begin(); }
240 iterator end () { return BasicBlocks.end(); }
241 const_iterator end () const { return BasicBlocks.end(); }
243 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
244 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
245 reverse_iterator rend () { return BasicBlocks.rend(); }
246 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
248 unsigned size() const { return (unsigned)BasicBlocks.size();}
249 bool empty() const { return BasicBlocks.empty(); }
250 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
251 MachineBasicBlock &front() { return BasicBlocks.front(); }
252 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
253 MachineBasicBlock & back() { return BasicBlocks.back(); }
255 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
256 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
257 void insert(iterator MBBI, MachineBasicBlock *MBB) {
258 BasicBlocks.insert(MBBI, MBB);
260 void splice(iterator InsertPt, iterator MBBI) {
261 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
264 void remove(iterator MBBI) {
265 BasicBlocks.remove(MBBI);
267 void erase(iterator MBBI) {
268 BasicBlocks.erase(MBBI);
271 //===--------------------------------------------------------------------===//
272 // Internal functions used to automatically number MachineBasicBlocks
275 /// getNextMBBNumber - Returns the next unique number to be assigned
276 /// to a MachineBasicBlock in this MachineFunction.
278 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
279 MBBNumbering.push_back(MBB);
280 return (unsigned)MBBNumbering.size()-1;
283 /// removeFromMBBNumbering - Remove the specific machine basic block from our
284 /// tracker, this is only really to be used by the MachineBasicBlock
286 void removeFromMBBNumbering(unsigned N) {
287 assert(N < MBBNumbering.size() && "Illegal basic block #");
291 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
292 /// of `new MachineInstr'.
294 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
298 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
299 /// 'Orig' instruction, identical in all ways except the the instruction
300 /// has no parent, prev, or next.
302 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
304 /// DeleteMachineInstr - Delete the given MachineInstr.
306 void DeleteMachineInstr(MachineInstr *MI);
308 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
309 /// instead of `new MachineBasicBlock'.
311 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
313 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
315 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
317 //===--------------------------------------------------------------------===//
321 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
322 /// source file, line, and column. If none currently exists, create a new
323 /// DebugLocTuple, and insert it into the DebugIdMap.
324 unsigned getOrCreateDebugLocID(unsigned Src, unsigned Line, unsigned Col);
326 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
327 DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
329 /// getDefaultDebugLoc - Get the default debug location for the machine
331 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
333 /// setDefaultDebugLoc - Get the default debug location for the machine
335 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
338 //===--------------------------------------------------------------------===//
339 // GraphTraits specializations for function basic block graphs (CFGs)
340 //===--------------------------------------------------------------------===//
342 // Provide specializations of GraphTraits to be able to treat a
343 // machine function as a graph of machine basic blocks... these are
344 // the same as the machine basic block iterators, except that the root
345 // node is implicitly the first node of the function.
347 template <> struct GraphTraits<MachineFunction*> :
348 public GraphTraits<MachineBasicBlock*> {
349 static NodeType *getEntryNode(MachineFunction *F) {
353 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
354 typedef MachineFunction::iterator nodes_iterator;
355 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
356 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
358 template <> struct GraphTraits<const MachineFunction*> :
359 public GraphTraits<const MachineBasicBlock*> {
360 static NodeType *getEntryNode(const MachineFunction *F) {
364 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
365 typedef MachineFunction::const_iterator nodes_iterator;
366 static nodes_iterator nodes_begin(const MachineFunction *F) { return F->begin(); }
367 static nodes_iterator nodes_end (const MachineFunction *F) { return F->end(); }
371 // Provide specializations of GraphTraits to be able to treat a function as a
372 // graph of basic blocks... and to walk it in inverse order. Inverse order for
373 // a function is considered to be when traversing the predecessor edges of a BB
374 // instead of the successor edges.
376 template <> struct GraphTraits<Inverse<MachineFunction*> > :
377 public GraphTraits<Inverse<MachineBasicBlock*> > {
378 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
379 return &G.Graph->front();
382 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
383 public GraphTraits<Inverse<const MachineBasicBlock*> > {
384 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
385 return &G.Graph->front();
389 } // End llvm namespace