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/Support/DebugLoc.h"
23 #include "llvm/Support/Dump.h"
24 #include "llvm/CodeGen/MachineBasicBlock.h"
25 #include "llvm/Support/Annotation.h"
26 #include "llvm/Support/Allocator.h"
27 #include "llvm/Support/Recycler.h"
32 class MachineRegisterInfo;
33 class MachineFrameInfo;
34 class MachineConstantPool;
35 class MachineJumpTableInfo;
37 class TargetRegisterClass;
40 struct ilist_traits<MachineBasicBlock>
41 : public ilist_default_traits<MachineBasicBlock> {
42 mutable ilist_node<MachineBasicBlock> Sentinel;
44 MachineBasicBlock *createSentinel() const {
45 return static_cast<MachineBasicBlock*>(&Sentinel);
47 void destroySentinel(MachineBasicBlock *) const {}
49 MachineBasicBlock *provideInitialHead() const { return createSentinel(); }
50 MachineBasicBlock *ensureHead(MachineBasicBlock*) const {
51 return createSentinel();
53 static void noteHead(MachineBasicBlock*, MachineBasicBlock*) {}
55 void addNodeToList(MachineBasicBlock* MBB);
56 void removeNodeFromList(MachineBasicBlock* MBB);
57 void deleteNode(MachineBasicBlock *MBB);
59 void createNode(const MachineBasicBlock &);
62 /// MachineFunctionInfo - This class can be derived from and used by targets to
63 /// hold private target-specific information for each MachineFunction. Objects
64 /// of type are accessed/created with MF::getInfo and destroyed when the
65 /// MachineFunction is destroyed.
66 struct MachineFunctionInfo {
67 virtual ~MachineFunctionInfo() {}
70 class MachineFunction : private Annotation {
72 const TargetMachine &Target;
74 // RegInfo - Information about each register in use in the function.
75 MachineRegisterInfo *RegInfo;
77 // Used to keep track of target-specific per-machine function information for
78 // the target implementation.
79 MachineFunctionInfo *MFInfo;
81 // Keep track of objects allocated on the stack.
82 MachineFrameInfo *FrameInfo;
84 // Keep track of constants which are spilled to memory
85 MachineConstantPool *ConstantPool;
87 // Keep track of jump tables for switch instructions
88 MachineJumpTableInfo *JumpTableInfo;
90 // Function-level unique numbering for MachineBasicBlocks. When a
91 // MachineBasicBlock is inserted into a MachineFunction is it automatically
92 // numbered and this vector keeps track of the mapping from ID's to MBB's.
93 std::vector<MachineBasicBlock*> MBBNumbering;
95 // Pool-allocate MachineFunction-lifetime and IR objects.
96 BumpPtrAllocator Allocator;
98 // Allocation management for instructions in function.
99 Recycler<MachineInstr> InstructionRecycler;
101 // Allocation management for basic blocks in function.
102 Recycler<MachineBasicBlock> BasicBlockRecycler;
104 // List of machine basic blocks in function
105 typedef ilist<MachineBasicBlock> BasicBlockListType;
106 BasicBlockListType BasicBlocks;
108 // Default debug location. Used to print out the debug label at the beginning
110 DebugLoc DefaultDebugLoc;
112 // Tracks debug locations.
113 DebugLocTracker DebugLocInfo;
115 // The alignment of the function.
119 MachineFunction(const Function *Fn, const TargetMachine &TM);
122 /// getFunction - Return the LLVM function that this machine code represents
124 const Function *getFunction() const { return Fn; }
126 /// getTarget - Return the target machine this machine code is compiled with
128 const TargetMachine &getTarget() const { return Target; }
130 /// getRegInfo - Return information about the registers currently in use.
132 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
133 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
135 /// getFrameInfo - Return the frame info object for the current function.
136 /// This object contains information about objects allocated on the stack
137 /// frame of the current function in an abstract way.
139 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
140 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
142 /// getJumpTableInfo - Return the jump table info object for the current
143 /// function. This object contains information about jump tables for switch
144 /// instructions in the current function.
146 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
147 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
149 /// getConstantPool - Return the constant pool object for the current
152 MachineConstantPool *getConstantPool() { return ConstantPool; }
153 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
155 /// getAlignment - Return the alignment (log2, not bytes) of the function.
157 unsigned getAlignment() const { return Alignment; }
159 /// setAlignment - Set the alignment (log2, not bytes) of the function.
161 void setAlignment(unsigned A) { Alignment = A; }
163 /// MachineFunctionInfo - Keep track of various per-function pieces of
164 /// information for backends that would like to do so.
166 template<typename Ty>
169 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
170 // that apparently breaks GCC 3.3.
171 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
172 AlignOf<Ty>::Alignment));
173 MFInfo = new (Loc) Ty(*this);
176 assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
177 "Invalid concrete type or multiple inheritence for getInfo");
178 return static_cast<Ty*>(MFInfo);
181 template<typename Ty>
182 const Ty *getInfo() const {
183 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
186 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
187 /// are inserted into the machine function. The block number for a machine
188 /// basic block can be found by using the MBB::getBlockNumber method, this
189 /// method provides the inverse mapping.
191 MachineBasicBlock *getBlockNumbered(unsigned N) const {
192 assert(N < MBBNumbering.size() && "Illegal block number");
193 assert(MBBNumbering[N] && "Block was removed from the machine function!");
194 return MBBNumbering[N];
197 /// getNumBlockIDs - Return the number of MBB ID's allocated.
199 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
201 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
202 /// recomputes them. This guarantees that the MBB numbers are sequential,
203 /// dense, and match the ordering of the blocks within the function. If a
204 /// specific MachineBasicBlock is specified, only that block and those after
205 /// it are renumbered.
206 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
208 /// print - Print out the MachineFunction in a format suitable for debugging
209 /// to the specified stream.
211 void print(std::ostream &OS,
212 const PrefixPrinter &prefix = PrefixPrinter()) const;
213 void print(std::ostream *OS,
214 const PrefixPrinter &prefix = PrefixPrinter()) const {
215 if (OS) print(*OS, prefix);
218 /// viewCFG - This function is meant for use from the debugger. You can just
219 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
220 /// program, displaying the CFG of the current function with the code for each
221 /// basic block inside. This depends on there being a 'dot' and 'gv' program
224 void viewCFG() const;
226 /// viewCFGOnly - This function is meant for use from the debugger. It works
227 /// just like viewCFG, but it does not include the contents of basic blocks
228 /// into the nodes, just the label. If you are only interested in the CFG
229 /// this can make the graph smaller.
231 void viewCFGOnly() const;
233 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
237 /// construct - Allocate and initialize a MachineFunction for a given Function
240 static MachineFunction& construct(const Function *F, const TargetMachine &TM);
242 /// destruct - Destroy the MachineFunction corresponding to a given Function
244 static void destruct(const Function *F);
246 /// get - Return a handle to a MachineFunction corresponding to the given
247 /// Function. This should not be called before "construct()" for a given
250 static MachineFunction& get(const Function *F);
252 // Provide accessors for the MachineBasicBlock list...
253 typedef BasicBlockListType::iterator iterator;
254 typedef BasicBlockListType::const_iterator const_iterator;
255 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
256 typedef std::reverse_iterator<iterator> reverse_iterator;
258 /// addLiveIn - Add the specified physical register as a live-in value and
259 /// create a corresponding virtual register for it.
260 unsigned addLiveIn(unsigned PReg, const TargetRegisterClass *RC);
262 //===--------------------------------------------------------------------===//
263 // BasicBlock accessor functions.
265 iterator begin() { return BasicBlocks.begin(); }
266 const_iterator begin() const { return BasicBlocks.begin(); }
267 iterator end () { return BasicBlocks.end(); }
268 const_iterator end () const { return BasicBlocks.end(); }
270 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
271 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
272 reverse_iterator rend () { return BasicBlocks.rend(); }
273 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
275 unsigned size() const { return (unsigned)BasicBlocks.size();}
276 bool empty() const { return BasicBlocks.empty(); }
277 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
278 MachineBasicBlock &front() { return BasicBlocks.front(); }
279 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
280 MachineBasicBlock & back() { return BasicBlocks.back(); }
282 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
283 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
284 void insert(iterator MBBI, MachineBasicBlock *MBB) {
285 BasicBlocks.insert(MBBI, MBB);
287 void splice(iterator InsertPt, iterator MBBI) {
288 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
291 void remove(iterator MBBI) {
292 BasicBlocks.remove(MBBI);
294 void erase(iterator MBBI) {
295 BasicBlocks.erase(MBBI);
298 //===--------------------------------------------------------------------===//
299 // Internal functions used to automatically number MachineBasicBlocks
302 /// getNextMBBNumber - Returns the next unique number to be assigned
303 /// to a MachineBasicBlock in this MachineFunction.
305 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
306 MBBNumbering.push_back(MBB);
307 return (unsigned)MBBNumbering.size()-1;
310 /// removeFromMBBNumbering - Remove the specific machine basic block from our
311 /// tracker, this is only really to be used by the MachineBasicBlock
313 void removeFromMBBNumbering(unsigned N) {
314 assert(N < MBBNumbering.size() && "Illegal basic block #");
318 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
319 /// of `new MachineInstr'.
321 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
325 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
326 /// 'Orig' instruction, identical in all ways except the the instruction
327 /// has no parent, prev, or next.
329 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
331 /// DeleteMachineInstr - Delete the given MachineInstr.
333 void DeleteMachineInstr(MachineInstr *MI);
335 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
336 /// instead of `new MachineBasicBlock'.
338 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
340 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
342 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
344 //===--------------------------------------------------------------------===//
348 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
349 /// source file, line, and column. If none currently exists, create a new
350 /// DebugLocTuple, and insert it into the DebugIdMap.
351 unsigned getOrCreateDebugLocID(GlobalVariable *CompileUnit,
352 unsigned Line, unsigned Col);
354 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
355 DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
357 /// getDefaultDebugLoc - Get the default debug location for the machine
359 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
361 /// setDefaultDebugLoc - Get the default debug location for the machine
363 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
365 /// getDebugLocInfo - Get the debug info location tracker.
366 DebugLocTracker &getDebugLocInfo() { return DebugLocInfo; }
369 //===--------------------------------------------------------------------===//
370 // GraphTraits specializations for function basic block graphs (CFGs)
371 //===--------------------------------------------------------------------===//
373 // Provide specializations of GraphTraits to be able to treat a
374 // machine function as a graph of machine basic blocks... these are
375 // the same as the machine basic block iterators, except that the root
376 // node is implicitly the first node of the function.
378 template <> struct GraphTraits<MachineFunction*> :
379 public GraphTraits<MachineBasicBlock*> {
380 static NodeType *getEntryNode(MachineFunction *F) {
384 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
385 typedef MachineFunction::iterator nodes_iterator;
386 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
387 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
389 template <> struct GraphTraits<const MachineFunction*> :
390 public GraphTraits<const MachineBasicBlock*> {
391 static NodeType *getEntryNode(const MachineFunction *F) {
395 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
396 typedef MachineFunction::const_iterator nodes_iterator;
397 static nodes_iterator nodes_begin(const MachineFunction *F) {
400 static nodes_iterator nodes_end (const MachineFunction *F) {
406 // Provide specializations of GraphTraits to be able to treat a function as a
407 // graph of basic blocks... and to walk it in inverse order. Inverse order for
408 // a function is considered to be when traversing the predecessor edges of a BB
409 // instead of the successor edges.
411 template <> struct GraphTraits<Inverse<MachineFunction*> > :
412 public GraphTraits<Inverse<MachineBasicBlock*> > {
413 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
414 return &G.Graph->front();
417 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
418 public GraphTraits<Inverse<const MachineBasicBlock*> > {
419 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
420 return &G.Graph->front();
424 } // End llvm namespace