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 /// FunctionNumber - This provides a unique ID for each function emitted in
116 /// this translation unit.
118 unsigned FunctionNumber;
120 // The alignment of the function.
123 MachineFunction(const MachineFunction &); // intentionally unimplemented
124 void operator=(const MachineFunction&); // intentionally unimplemented
127 MachineFunction(Function *Fn, const TargetMachine &TM, unsigned FunctionNum);
130 /// getFunction - Return the LLVM function that this machine code represents
132 Function *getFunction() const { return Fn; }
134 /// getFunctionNumber - Return a unique ID for the current function.
136 unsigned getFunctionNumber() const { return FunctionNumber; }
138 /// getTarget - Return the target machine this machine code is compiled with
140 const TargetMachine &getTarget() const { return Target; }
142 /// getRegInfo - Return information about the registers currently in use.
144 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
145 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
147 /// getFrameInfo - Return the frame info object for the current function.
148 /// This object contains information about objects allocated on the stack
149 /// frame of the current function in an abstract way.
151 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
152 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
154 /// getJumpTableInfo - Return the jump table info object for the current
155 /// function. This object contains information about jump tables in the
156 /// current function. If the current function has no jump tables, this will
158 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
159 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
161 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
162 /// does already exist, allocate one.
163 MachineJumpTableInfo *getOrCreateJumpTableInfo(unsigned JTEntryKind);
166 /// getConstantPool - Return the constant pool object for the current
169 MachineConstantPool *getConstantPool() { return ConstantPool; }
170 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
172 /// getAlignment - Return the alignment (log2, not bytes) of the function.
174 unsigned getAlignment() const { return Alignment; }
176 /// setAlignment - Set the alignment (log2, not bytes) of the function.
178 void setAlignment(unsigned A) { Alignment = A; }
180 /// getInfo - Keep track of various per-function pieces of information for
181 /// backends that would like to do so.
183 template<typename Ty>
186 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
187 // that apparently breaks GCC 3.3.
188 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
189 AlignOf<Ty>::Alignment));
190 MFInfo = new (Loc) Ty(*this);
192 return static_cast<Ty*>(MFInfo);
195 template<typename Ty>
196 const Ty *getInfo() const {
197 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
200 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
201 /// are inserted into the machine function. The block number for a machine
202 /// basic block can be found by using the MBB::getBlockNumber method, this
203 /// method provides the inverse mapping.
205 MachineBasicBlock *getBlockNumbered(unsigned N) const {
206 assert(N < MBBNumbering.size() && "Illegal block number");
207 assert(MBBNumbering[N] && "Block was removed from the machine function!");
208 return MBBNumbering[N];
211 /// getNumBlockIDs - Return the number of MBB ID's allocated.
213 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
215 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
216 /// recomputes them. This guarantees that the MBB numbers are sequential,
217 /// dense, and match the ordering of the blocks within the function. If a
218 /// specific MachineBasicBlock is specified, only that block and those after
219 /// it are renumbered.
220 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
222 /// print - Print out the MachineFunction in a format suitable for debugging
223 /// to the specified stream.
225 void print(raw_ostream &OS) const;
227 /// viewCFG - This function is meant for use from the debugger. You can just
228 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
229 /// program, displaying the CFG of the current function with the code for each
230 /// basic block inside. This depends on there being a 'dot' and 'gv' program
233 void viewCFG() const;
235 /// viewCFGOnly - This function is meant for use from the debugger. It works
236 /// just like viewCFG, but it does not include the contents of basic blocks
237 /// into the nodes, just the label. If you are only interested in the CFG
238 /// this can make the graph smaller.
240 void viewCFGOnly() const;
242 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
246 /// verify - Run the current MachineFunction through the machine code
247 /// verifier, useful for debugger use.
248 void verify(Pass *p=NULL, bool allowDoubleDefs=false) const;
250 // Provide accessors for the MachineBasicBlock list...
251 typedef BasicBlockListType::iterator iterator;
252 typedef BasicBlockListType::const_iterator const_iterator;
253 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
254 typedef std::reverse_iterator<iterator> reverse_iterator;
256 /// addLiveIn - Add the specified physical register as a live-in value and
257 /// create a corresponding virtual register for it.
258 unsigned addLiveIn(unsigned PReg, const TargetRegisterClass *RC);
260 //===--------------------------------------------------------------------===//
261 // BasicBlock accessor functions.
263 iterator begin() { return BasicBlocks.begin(); }
264 const_iterator begin() const { return BasicBlocks.begin(); }
265 iterator end () { return BasicBlocks.end(); }
266 const_iterator end () const { return BasicBlocks.end(); }
268 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
269 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
270 reverse_iterator rend () { return BasicBlocks.rend(); }
271 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
273 unsigned size() const { return (unsigned)BasicBlocks.size();}
274 bool empty() const { return BasicBlocks.empty(); }
275 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
276 MachineBasicBlock &front() { return BasicBlocks.front(); }
277 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
278 MachineBasicBlock & back() { return BasicBlocks.back(); }
280 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
281 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
282 void insert(iterator MBBI, MachineBasicBlock *MBB) {
283 BasicBlocks.insert(MBBI, MBB);
285 void splice(iterator InsertPt, iterator MBBI) {
286 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
288 void splice(iterator InsertPt, iterator MBBI, iterator MBBE) {
289 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI, MBBE);
292 void remove(iterator MBBI) {
293 BasicBlocks.remove(MBBI);
295 void erase(iterator MBBI) {
296 BasicBlocks.erase(MBBI);
299 //===--------------------------------------------------------------------===//
300 // Internal functions used to automatically number MachineBasicBlocks
303 /// getNextMBBNumber - Returns the next unique number to be assigned
304 /// to a MachineBasicBlock in this MachineFunction.
306 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
307 MBBNumbering.push_back(MBB);
308 return (unsigned)MBBNumbering.size()-1;
311 /// removeFromMBBNumbering - Remove the specific machine basic block from our
312 /// tracker, this is only really to be used by the MachineBasicBlock
314 void removeFromMBBNumbering(unsigned N) {
315 assert(N < MBBNumbering.size() && "Illegal basic block #");
319 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
320 /// of `new MachineInstr'.
322 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
326 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
327 /// 'Orig' instruction, identical in all ways except the the instruction
328 /// has no parent, prev, or next.
330 /// See also TargetInstrInfo::duplicate() for target-specific fixes to cloned
332 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
334 /// DeleteMachineInstr - Delete the given MachineInstr.
336 void DeleteMachineInstr(MachineInstr *MI);
338 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
339 /// instead of `new MachineBasicBlock'.
341 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
343 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
345 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
347 /// getMachineMemOperand - Allocate a new MachineMemOperand.
348 /// MachineMemOperands are owned by the MachineFunction and need not be
349 /// explicitly deallocated.
350 MachineMemOperand *getMachineMemOperand(const Value *v, unsigned f,
351 int64_t o, uint64_t s,
352 unsigned base_alignment);
354 /// getMachineMemOperand - Allocate a new MachineMemOperand by copying
355 /// an existing one, adjusting by an offset and using the given size.
356 /// MachineMemOperands are owned by the MachineFunction and need not be
357 /// explicitly deallocated.
358 MachineMemOperand *getMachineMemOperand(const MachineMemOperand *MMO,
359 int64_t Offset, uint64_t Size);
361 /// allocateMemRefsArray - Allocate an array to hold MachineMemOperand
362 /// pointers. This array is owned by the MachineFunction.
363 MachineInstr::mmo_iterator allocateMemRefsArray(unsigned long Num);
365 /// extractLoadMemRefs - Allocate an array and populate it with just the
366 /// load information from the given MachineMemOperand sequence.
367 std::pair<MachineInstr::mmo_iterator,
368 MachineInstr::mmo_iterator>
369 extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
370 MachineInstr::mmo_iterator End);
372 /// extractStoreMemRefs - Allocate an array and populate it with just the
373 /// store information from the given MachineMemOperand sequence.
374 std::pair<MachineInstr::mmo_iterator,
375 MachineInstr::mmo_iterator>
376 extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
377 MachineInstr::mmo_iterator End);
379 //===--------------------------------------------------------------------===//
380 // Label Manipulation.
383 /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
384 /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
385 /// normal 'L' label is returned.
386 MCSymbol *getJTISymbol(unsigned JTI, MCContext &Ctx,
387 bool isLinkerPrivate = false) const;
390 //===--------------------------------------------------------------------===//
394 /// getDILocation - Get the DILocation for a given DebugLoc object.
395 DILocation getDILocation(DebugLoc DL) const;
397 /// getDefaultDebugLoc - Get the default debug location for the machine
399 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
401 /// setDefaultDebugLoc - Get the default debug location for the machine
403 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
405 /// getDebugLocInfo - Get the debug info location tracker.
406 DebugLocTracker &getDebugLocInfo() { return DebugLocInfo; }
409 //===--------------------------------------------------------------------===//
410 // GraphTraits specializations for function basic block graphs (CFGs)
411 //===--------------------------------------------------------------------===//
413 // Provide specializations of GraphTraits to be able to treat a
414 // machine function as a graph of machine basic blocks... these are
415 // the same as the machine basic block iterators, except that the root
416 // node is implicitly the first node of the function.
418 template <> struct GraphTraits<MachineFunction*> :
419 public GraphTraits<MachineBasicBlock*> {
420 static NodeType *getEntryNode(MachineFunction *F) {
424 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
425 typedef MachineFunction::iterator nodes_iterator;
426 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
427 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
429 template <> struct GraphTraits<const MachineFunction*> :
430 public GraphTraits<const MachineBasicBlock*> {
431 static NodeType *getEntryNode(const MachineFunction *F) {
435 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
436 typedef MachineFunction::const_iterator nodes_iterator;
437 static nodes_iterator nodes_begin(const MachineFunction *F) {
440 static nodes_iterator nodes_end (const MachineFunction *F) {
446 // Provide specializations of GraphTraits to be able to treat a function as a
447 // graph of basic blocks... and to walk it in inverse order. Inverse order for
448 // a function is considered to be when traversing the predecessor edges of a BB
449 // instead of the successor edges.
451 template <> struct GraphTraits<Inverse<MachineFunction*> > :
452 public GraphTraits<Inverse<MachineBasicBlock*> > {
453 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
454 return &G.Graph->front();
457 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
458 public GraphTraits<Inverse<const MachineBasicBlock*> > {
459 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
460 return &G.Graph->front();
464 } // End llvm namespace