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/CodeGen/MachineBasicBlock.h"
22 #include "llvm/ADT/ilist.h"
23 #include "llvm/Support/DebugLoc.h"
24 #include "llvm/Support/Allocator.h"
25 #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_half_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 {
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.
118 MachineFunction(const MachineFunction &); // intentionally unimplemented
119 void operator=(const MachineFunction&); // intentionally unimplemented
122 MachineFunction(Function *Fn, const TargetMachine &TM);
125 /// getFunction - Return the LLVM function that this machine code represents
127 Function *getFunction() const { return Fn; }
129 /// getTarget - Return the target machine this machine code is compiled with
131 const TargetMachine &getTarget() const { return Target; }
133 /// getRegInfo - Return information about the registers currently in use.
135 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
136 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
138 /// getFrameInfo - Return the frame info object for the current function.
139 /// This object contains information about objects allocated on the stack
140 /// frame of the current function in an abstract way.
142 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
143 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
145 /// getJumpTableInfo - Return the jump table info object for the current
146 /// function. This object contains information about jump tables in the
147 /// current function. If the current function has no jump tables, this will
149 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
150 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
152 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
153 /// does already exist, allocate one.
154 MachineJumpTableInfo *getOrCreateJumpTableInfo(unsigned JTEntryKind);
157 /// getConstantPool - Return the constant pool object for the current
160 MachineConstantPool *getConstantPool() { return ConstantPool; }
161 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
163 /// getAlignment - Return the alignment (log2, not bytes) of the function.
165 unsigned getAlignment() const { return Alignment; }
167 /// setAlignment - Set the alignment (log2, not bytes) of the function.
169 void setAlignment(unsigned A) { Alignment = A; }
171 /// getInfo - Keep track of various per-function pieces of information for
172 /// backends that would like to do so.
174 template<typename Ty>
177 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
178 // that apparently breaks GCC 3.3.
179 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
180 AlignOf<Ty>::Alignment));
181 MFInfo = new (Loc) Ty(*this);
183 return static_cast<Ty*>(MFInfo);
186 template<typename Ty>
187 const Ty *getInfo() const {
188 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
191 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
192 /// are inserted into the machine function. The block number for a machine
193 /// basic block can be found by using the MBB::getBlockNumber method, this
194 /// method provides the inverse mapping.
196 MachineBasicBlock *getBlockNumbered(unsigned N) const {
197 assert(N < MBBNumbering.size() && "Illegal block number");
198 assert(MBBNumbering[N] && "Block was removed from the machine function!");
199 return MBBNumbering[N];
202 /// getNumBlockIDs - Return the number of MBB ID's allocated.
204 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
206 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
207 /// recomputes them. This guarantees that the MBB numbers are sequential,
208 /// dense, and match the ordering of the blocks within the function. If a
209 /// specific MachineBasicBlock is specified, only that block and those after
210 /// it are renumbered.
211 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
213 /// print - Print out the MachineFunction in a format suitable for debugging
214 /// to the specified stream.
216 void print(raw_ostream &OS) const;
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 /// verify - Run the current MachineFunction through the machine code
238 /// verifier, useful for debugger use.
239 void verify(Pass *p=NULL, bool allowDoubleDefs=false) const;
241 // Provide accessors for the MachineBasicBlock list...
242 typedef BasicBlockListType::iterator iterator;
243 typedef BasicBlockListType::const_iterator const_iterator;
244 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
245 typedef std::reverse_iterator<iterator> reverse_iterator;
247 /// addLiveIn - Add the specified physical register as a live-in value and
248 /// create a corresponding virtual register for it.
249 unsigned addLiveIn(unsigned PReg, const TargetRegisterClass *RC);
251 //===--------------------------------------------------------------------===//
252 // BasicBlock accessor functions.
254 iterator begin() { return BasicBlocks.begin(); }
255 const_iterator begin() const { return BasicBlocks.begin(); }
256 iterator end () { return BasicBlocks.end(); }
257 const_iterator end () const { return BasicBlocks.end(); }
259 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
260 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
261 reverse_iterator rend () { return BasicBlocks.rend(); }
262 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
264 unsigned size() const { return (unsigned)BasicBlocks.size();}
265 bool empty() const { return BasicBlocks.empty(); }
266 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
267 MachineBasicBlock &front() { return BasicBlocks.front(); }
268 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
269 MachineBasicBlock & back() { return BasicBlocks.back(); }
271 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
272 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
273 void insert(iterator MBBI, MachineBasicBlock *MBB) {
274 BasicBlocks.insert(MBBI, MBB);
276 void splice(iterator InsertPt, iterator MBBI) {
277 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
279 void splice(iterator InsertPt, iterator MBBI, iterator MBBE) {
280 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI, MBBE);
283 void remove(iterator MBBI) {
284 BasicBlocks.remove(MBBI);
286 void erase(iterator MBBI) {
287 BasicBlocks.erase(MBBI);
290 //===--------------------------------------------------------------------===//
291 // Internal functions used to automatically number MachineBasicBlocks
294 /// getNextMBBNumber - Returns the next unique number to be assigned
295 /// to a MachineBasicBlock in this MachineFunction.
297 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
298 MBBNumbering.push_back(MBB);
299 return (unsigned)MBBNumbering.size()-1;
302 /// removeFromMBBNumbering - Remove the specific machine basic block from our
303 /// tracker, this is only really to be used by the MachineBasicBlock
305 void removeFromMBBNumbering(unsigned N) {
306 assert(N < MBBNumbering.size() && "Illegal basic block #");
310 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
311 /// of `new MachineInstr'.
313 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
317 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
318 /// 'Orig' instruction, identical in all ways except the the instruction
319 /// has no parent, prev, or next.
321 /// See also TargetInstrInfo::duplicate() for target-specific fixes to cloned
323 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
325 /// DeleteMachineInstr - Delete the given MachineInstr.
327 void DeleteMachineInstr(MachineInstr *MI);
329 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
330 /// instead of `new MachineBasicBlock'.
332 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
334 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
336 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
338 /// getMachineMemOperand - Allocate a new MachineMemOperand.
339 /// MachineMemOperands are owned by the MachineFunction and need not be
340 /// explicitly deallocated.
341 MachineMemOperand *getMachineMemOperand(const Value *v, unsigned f,
342 int64_t o, uint64_t s,
343 unsigned base_alignment);
345 /// getMachineMemOperand - Allocate a new MachineMemOperand by copying
346 /// an existing one, adjusting by an offset and using the given size.
347 /// MachineMemOperands are owned by the MachineFunction and need not be
348 /// explicitly deallocated.
349 MachineMemOperand *getMachineMemOperand(const MachineMemOperand *MMO,
350 int64_t Offset, uint64_t Size);
352 /// allocateMemRefsArray - Allocate an array to hold MachineMemOperand
353 /// pointers. This array is owned by the MachineFunction.
354 MachineInstr::mmo_iterator allocateMemRefsArray(unsigned long Num);
356 /// extractLoadMemRefs - Allocate an array and populate it with just the
357 /// load information from the given MachineMemOperand sequence.
358 std::pair<MachineInstr::mmo_iterator,
359 MachineInstr::mmo_iterator>
360 extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
361 MachineInstr::mmo_iterator End);
363 /// extractStoreMemRefs - Allocate an array and populate it with just the
364 /// store information from the given MachineMemOperand sequence.
365 std::pair<MachineInstr::mmo_iterator,
366 MachineInstr::mmo_iterator>
367 extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
368 MachineInstr::mmo_iterator End);
370 //===--------------------------------------------------------------------===//
374 /// getDILocation - Get the DILocation for a given DebugLoc object.
375 DILocation getDILocation(DebugLoc DL) const;
377 /// getDefaultDebugLoc - Get the default debug location for the machine
379 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
381 /// setDefaultDebugLoc - Get the default debug location for the machine
383 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
385 /// getDebugLocInfo - Get the debug info location tracker.
386 DebugLocTracker &getDebugLocInfo() { return DebugLocInfo; }
389 //===--------------------------------------------------------------------===//
390 // GraphTraits specializations for function basic block graphs (CFGs)
391 //===--------------------------------------------------------------------===//
393 // Provide specializations of GraphTraits to be able to treat a
394 // machine function as a graph of machine basic blocks... these are
395 // the same as the machine basic block iterators, except that the root
396 // node is implicitly the first node of the function.
398 template <> struct GraphTraits<MachineFunction*> :
399 public GraphTraits<MachineBasicBlock*> {
400 static NodeType *getEntryNode(MachineFunction *F) {
404 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
405 typedef MachineFunction::iterator nodes_iterator;
406 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
407 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
409 template <> struct GraphTraits<const MachineFunction*> :
410 public GraphTraits<const MachineBasicBlock*> {
411 static NodeType *getEntryNode(const MachineFunction *F) {
415 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
416 typedef MachineFunction::const_iterator nodes_iterator;
417 static nodes_iterator nodes_begin(const MachineFunction *F) {
420 static nodes_iterator nodes_end (const MachineFunction *F) {
426 // Provide specializations of GraphTraits to be able to treat a function as a
427 // graph of basic blocks... and to walk it in inverse order. Inverse order for
428 // a function is considered to be when traversing the predecessor edges of a BB
429 // instead of the successor edges.
431 template <> struct GraphTraits<Inverse<MachineFunction*> > :
432 public GraphTraits<Inverse<MachineBasicBlock*> > {
433 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
434 return &G.Graph->front();
437 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
438 public GraphTraits<Inverse<const MachineBasicBlock*> > {
439 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
440 return &G.Graph->front();
444 } // End llvm namespace