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;
36 class TargetRegisterClass;
39 struct ilist_traits<MachineBasicBlock>
40 : public ilist_default_traits<MachineBasicBlock> {
41 mutable ilist_node<MachineBasicBlock> Sentinel;
43 MachineBasicBlock *createSentinel() const {
44 return static_cast<MachineBasicBlock*>(&Sentinel);
46 void destroySentinel(MachineBasicBlock *) const {}
48 MachineBasicBlock *provideInitialHead() const { return createSentinel(); }
49 MachineBasicBlock *ensureHead(MachineBasicBlock*) const {
50 return createSentinel();
52 static void noteHead(MachineBasicBlock*, MachineBasicBlock*) {}
54 void addNodeToList(MachineBasicBlock* MBB);
55 void removeNodeFromList(MachineBasicBlock* MBB);
56 void deleteNode(MachineBasicBlock *MBB);
58 void createNode(const MachineBasicBlock &);
61 /// MachineFunctionInfo - This class can be derived from and used by targets to
62 /// hold private target-specific information for each MachineFunction. Objects
63 /// of type are accessed/created with MF::getInfo and destroyed when the
64 /// MachineFunction is destroyed.
65 struct MachineFunctionInfo {
66 virtual ~MachineFunctionInfo() {}
69 class MachineFunction : private Annotation {
71 const TargetMachine &Target;
73 // HasBuiltinSetjmp - true if the function uses builtin_setjmp. Used to
74 // adjust callee-saved register tracking.
75 bool HasBuiltinSetjmp;
77 // RegInfo - Information about each register in use in the function.
78 MachineRegisterInfo *RegInfo;
80 // Used to keep track of target-specific per-machine function information for
81 // the target implementation.
82 MachineFunctionInfo *MFInfo;
84 // Keep track of objects allocated on the stack.
85 MachineFrameInfo *FrameInfo;
87 // Keep track of constants which are spilled to memory
88 MachineConstantPool *ConstantPool;
90 // Keep track of jump tables for switch instructions
91 MachineJumpTableInfo *JumpTableInfo;
93 // Function-level unique numbering for MachineBasicBlocks. When a
94 // MachineBasicBlock is inserted into a MachineFunction is it automatically
95 // numbered and this vector keeps track of the mapping from ID's to MBB's.
96 std::vector<MachineBasicBlock*> MBBNumbering;
98 // Pool-allocate MachineFunction-lifetime and IR objects.
99 BumpPtrAllocator Allocator;
101 // Allocation management for instructions in function.
102 Recycler<MachineInstr> InstructionRecycler;
104 // Allocation management for basic blocks in function.
105 Recycler<MachineBasicBlock> BasicBlockRecycler;
107 // List of machine basic blocks in function
108 typedef ilist<MachineBasicBlock> BasicBlockListType;
109 BasicBlockListType BasicBlocks;
111 // Default debug location. Used to print out the debug label at the beginning
113 DebugLoc DefaultDebugLoc;
115 // Tracks debug locations.
116 DebugLocTracker DebugLocInfo;
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 /// doesHaveBuiltinSetjmp - Return whether this function uses builtin_setjmp
132 bool doesHaveBuiltinSetjmp() const { return HasBuiltinSetjmp; }
134 /// setHasBuiltinSetjmp - Mark whether this function uses builtin_setjmp
136 void setHasBuiltinSetjmp (bool flag) { HasBuiltinSetjmp = flag; }
138 /// getRegInfo - Return information about the registers currently in use.
140 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
141 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
143 /// getFrameInfo - Return the frame info object for the current function.
144 /// This object contains information about objects allocated on the stack
145 /// frame of the current function in an abstract way.
147 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
148 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
150 /// getJumpTableInfo - Return the jump table info object for the current
151 /// function. This object contains information about jump tables for switch
152 /// instructions in the current function.
154 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
155 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
157 /// getConstantPool - Return the constant pool object for the current
160 MachineConstantPool *getConstantPool() { return ConstantPool; }
161 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
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) const;
212 void print(std::ostream *OS) const { if (OS) print(*OS); }
214 /// viewCFG - This function is meant for use from the debugger. You can just
215 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
216 /// program, displaying the CFG of the current function with the code for each
217 /// basic block inside. This depends on there being a 'dot' and 'gv' program
220 void viewCFG() const;
222 /// viewCFGOnly - This function is meant for use from the debugger. It works
223 /// just like viewCFG, but it does not include the contents of basic blocks
224 /// into the nodes, just the label. If you are only interested in the CFG
225 /// this can make the graph smaller.
227 void viewCFGOnly() const;
229 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
233 /// construct - Allocate and initialize a MachineFunction for a given Function
236 static MachineFunction& construct(const Function *F, const TargetMachine &TM);
238 /// destruct - Destroy the MachineFunction corresponding to a given Function
240 static void destruct(const Function *F);
242 /// get - Return a handle to a MachineFunction corresponding to the given
243 /// Function. This should not be called before "construct()" for a given
246 static MachineFunction& get(const Function *F);
248 // Provide accessors for the MachineBasicBlock list...
249 typedef BasicBlockListType::iterator iterator;
250 typedef BasicBlockListType::const_iterator const_iterator;
251 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
252 typedef std::reverse_iterator<iterator> reverse_iterator;
254 /// addLiveIn - Add the specified physical register as a live-in value and
255 /// create a corresponding virtual register for it.
256 unsigned addLiveIn(unsigned PReg, const TargetRegisterClass *RC);
258 //===--------------------------------------------------------------------===//
259 // BasicBlock accessor functions.
261 iterator begin() { return BasicBlocks.begin(); }
262 const_iterator begin() const { return BasicBlocks.begin(); }
263 iterator end () { return BasicBlocks.end(); }
264 const_iterator end () const { return BasicBlocks.end(); }
266 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
267 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
268 reverse_iterator rend () { return BasicBlocks.rend(); }
269 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
271 unsigned size() const { return (unsigned)BasicBlocks.size();}
272 bool empty() const { return BasicBlocks.empty(); }
273 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
274 MachineBasicBlock &front() { return BasicBlocks.front(); }
275 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
276 MachineBasicBlock & back() { return BasicBlocks.back(); }
278 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
279 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
280 void insert(iterator MBBI, MachineBasicBlock *MBB) {
281 BasicBlocks.insert(MBBI, MBB);
283 void splice(iterator InsertPt, iterator MBBI) {
284 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
287 void remove(iterator MBBI) {
288 BasicBlocks.remove(MBBI);
290 void erase(iterator MBBI) {
291 BasicBlocks.erase(MBBI);
294 //===--------------------------------------------------------------------===//
295 // Internal functions used to automatically number MachineBasicBlocks
298 /// getNextMBBNumber - Returns the next unique number to be assigned
299 /// to a MachineBasicBlock in this MachineFunction.
301 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
302 MBBNumbering.push_back(MBB);
303 return (unsigned)MBBNumbering.size()-1;
306 /// removeFromMBBNumbering - Remove the specific machine basic block from our
307 /// tracker, this is only really to be used by the MachineBasicBlock
309 void removeFromMBBNumbering(unsigned N) {
310 assert(N < MBBNumbering.size() && "Illegal basic block #");
314 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
315 /// of `new MachineInstr'.
317 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
321 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
322 /// 'Orig' instruction, identical in all ways except the the instruction
323 /// has no parent, prev, or next.
325 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
327 /// DeleteMachineInstr - Delete the given MachineInstr.
329 void DeleteMachineInstr(MachineInstr *MI);
331 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
332 /// instead of `new MachineBasicBlock'.
334 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
336 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
338 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
340 //===--------------------------------------------------------------------===//
344 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
345 /// source file, line, and column. If none currently exists, create a new
346 /// DebugLocTuple, and insert it into the DebugIdMap.
347 unsigned getOrCreateDebugLocID(GlobalVariable *CompileUnit,
348 unsigned Line, unsigned Col);
350 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
351 DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
353 /// getDefaultDebugLoc - Get the default debug location for the machine
355 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
357 /// setDefaultDebugLoc - Get the default debug location for the machine
359 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
362 //===--------------------------------------------------------------------===//
363 // GraphTraits specializations for function basic block graphs (CFGs)
364 //===--------------------------------------------------------------------===//
366 // Provide specializations of GraphTraits to be able to treat a
367 // machine function as a graph of machine basic blocks... these are
368 // the same as the machine basic block iterators, except that the root
369 // node is implicitly the first node of the function.
371 template <> struct GraphTraits<MachineFunction*> :
372 public GraphTraits<MachineBasicBlock*> {
373 static NodeType *getEntryNode(MachineFunction *F) {
377 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
378 typedef MachineFunction::iterator nodes_iterator;
379 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
380 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
382 template <> struct GraphTraits<const MachineFunction*> :
383 public GraphTraits<const MachineBasicBlock*> {
384 static NodeType *getEntryNode(const MachineFunction *F) {
388 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
389 typedef MachineFunction::const_iterator nodes_iterator;
390 static nodes_iterator nodes_begin(const MachineFunction *F) {
393 static nodes_iterator nodes_end (const MachineFunction *F) {
399 // Provide specializations of GraphTraits to be able to treat a function as a
400 // graph of basic blocks... and to walk it in inverse order. Inverse order for
401 // a function is considered to be when traversing the predecessor edges of a BB
402 // instead of the successor edges.
404 template <> struct GraphTraits<Inverse<MachineFunction*> > :
405 public GraphTraits<Inverse<MachineBasicBlock*> > {
406 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
407 return &G.Graph->front();
410 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
411 public GraphTraits<Inverse<const MachineBasicBlock*> > {
412 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
413 return &G.Graph->front();
417 } // End llvm namespace