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 MachineBasicBlock Sentinel;
42 MachineBasicBlock *createSentinel() const { return &Sentinel; }
43 void destroySentinel(MachineBasicBlock *) const {}
45 void addNodeToList(MachineBasicBlock* MBB);
46 void removeNodeFromList(MachineBasicBlock* MBB);
47 void deleteNode(MachineBasicBlock *MBB);
49 void createNode(const MachineBasicBlock &);
52 /// MachineFunctionInfo - This class can be derived from and used by targets to
53 /// hold private target-specific information for each MachineFunction. Objects
54 /// of type are accessed/created with MF::getInfo and destroyed when the
55 /// MachineFunction is destroyed.
56 struct MachineFunctionInfo {
57 virtual ~MachineFunctionInfo() {}
60 class MachineFunction : private Annotation {
62 const TargetMachine &Target;
64 // RegInfo - Information about each register in use in the function.
65 MachineRegisterInfo *RegInfo;
67 // Used to keep track of target-specific per-machine function information for
68 // the target implementation.
69 MachineFunctionInfo *MFInfo;
71 // Keep track of objects allocated on the stack.
72 MachineFrameInfo *FrameInfo;
74 // Keep track of constants which are spilled to memory
75 MachineConstantPool *ConstantPool;
77 // Keep track of jump tables for switch instructions
78 MachineJumpTableInfo *JumpTableInfo;
80 // Function-level unique numbering for MachineBasicBlocks. When a
81 // MachineBasicBlock is inserted into a MachineFunction is it automatically
82 // numbered and this vector keeps track of the mapping from ID's to MBB's.
83 std::vector<MachineBasicBlock*> MBBNumbering;
85 // Pool-allocate MachineFunction-lifetime and IR objects.
86 BumpPtrAllocator Allocator;
88 // Allocation management for instructions in function.
89 Recycler<MachineInstr> InstructionRecycler;
91 // Allocation management for basic blocks in function.
92 Recycler<MachineBasicBlock> BasicBlockRecycler;
94 // List of machine basic blocks in function
95 typedef ilist<MachineBasicBlock> BasicBlockListType;
96 BasicBlockListType BasicBlocks;
98 // Default debug location. Used to print out the debug label at the beginning
100 DebugLoc DefaultDebugLoc;
102 // Tracks debug locations.
103 DebugLocTracker DebugLocInfo;
106 MachineFunction(const Function *Fn, const TargetMachine &TM);
109 /// getFunction - Return the LLVM function that this machine code represents
111 const Function *getFunction() const { return Fn; }
113 /// getTarget - Return the target machine this machine code is compiled with
115 const TargetMachine &getTarget() const { return Target; }
117 /// getRegInfo - Return information about the registers currently in use.
119 MachineRegisterInfo &getRegInfo() { return *RegInfo; }
120 const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
122 /// getFrameInfo - Return the frame info object for the current function.
123 /// This object contains information about objects allocated on the stack
124 /// frame of the current function in an abstract way.
126 MachineFrameInfo *getFrameInfo() { return FrameInfo; }
127 const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
129 /// getJumpTableInfo - Return the jump table info object for the current
130 /// function. This object contains information about jump tables for switch
131 /// instructions in the current function.
133 MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
134 const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
136 /// getConstantPool - Return the constant pool object for the current
139 MachineConstantPool *getConstantPool() { return ConstantPool; }
140 const MachineConstantPool *getConstantPool() const { return ConstantPool; }
142 /// MachineFunctionInfo - Keep track of various per-function pieces of
143 /// information for backends that would like to do so.
145 template<typename Ty>
148 // This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
149 // that apparently breaks GCC 3.3.
150 Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
151 AlignOf<Ty>::Alignment));
152 MFInfo = new (Loc) Ty(*this);
155 assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
156 "Invalid concrete type or multiple inheritence for getInfo");
157 return static_cast<Ty*>(MFInfo);
160 template<typename Ty>
161 const Ty *getInfo() const {
162 return const_cast<MachineFunction*>(this)->getInfo<Ty>();
165 /// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
166 /// are inserted into the machine function. The block number for a machine
167 /// basic block can be found by using the MBB::getBlockNumber method, this
168 /// method provides the inverse mapping.
170 MachineBasicBlock *getBlockNumbered(unsigned N) {
171 assert(N < MBBNumbering.size() && "Illegal block number");
172 assert(MBBNumbering[N] && "Block was removed from the machine function!");
173 return MBBNumbering[N];
176 /// getNumBlockIDs - Return the number of MBB ID's allocated.
178 unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
180 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
181 /// recomputes them. This guarantees that the MBB numbers are sequential,
182 /// dense, and match the ordering of the blocks within the function. If a
183 /// specific MachineBasicBlock is specified, only that block and those after
184 /// it are renumbered.
185 void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
187 /// print - Print out the MachineFunction in a format suitable for debugging
188 /// to the specified stream.
190 void print(std::ostream &OS) const;
191 void print(std::ostream *OS) const { if (OS) print(*OS); }
193 /// viewCFG - This function is meant for use from the debugger. You can just
194 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
195 /// program, displaying the CFG of the current function with the code for each
196 /// basic block inside. This depends on there being a 'dot' and 'gv' program
199 void viewCFG() const;
201 /// viewCFGOnly - This function is meant for use from the debugger. It works
202 /// just like viewCFG, but it does not include the contents of basic blocks
203 /// into the nodes, just the label. If you are only interested in the CFG
204 /// this can make the graph smaller.
206 void viewCFGOnly() const;
208 /// dump - Print the current MachineFunction to cerr, useful for debugger use.
212 /// construct - Allocate and initialize a MachineFunction for a given Function
215 static MachineFunction& construct(const Function *F, const TargetMachine &TM);
217 /// destruct - Destroy the MachineFunction corresponding to a given Function
219 static void destruct(const Function *F);
221 /// get - Return a handle to a MachineFunction corresponding to the given
222 /// Function. This should not be called before "construct()" for a given
225 static MachineFunction& get(const Function *F);
227 // Provide accessors for the MachineBasicBlock list...
228 typedef BasicBlockListType::iterator iterator;
229 typedef BasicBlockListType::const_iterator const_iterator;
230 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
231 typedef std::reverse_iterator<iterator> reverse_iterator;
233 //===--------------------------------------------------------------------===//
234 // BasicBlock accessor functions.
236 iterator begin() { return BasicBlocks.begin(); }
237 const_iterator begin() const { return BasicBlocks.begin(); }
238 iterator end () { return BasicBlocks.end(); }
239 const_iterator end () const { return BasicBlocks.end(); }
241 reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
242 const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
243 reverse_iterator rend () { return BasicBlocks.rend(); }
244 const_reverse_iterator rend () const { return BasicBlocks.rend(); }
246 unsigned size() const { return (unsigned)BasicBlocks.size();}
247 bool empty() const { return BasicBlocks.empty(); }
248 const MachineBasicBlock &front() const { return BasicBlocks.front(); }
249 MachineBasicBlock &front() { return BasicBlocks.front(); }
250 const MachineBasicBlock & back() const { return BasicBlocks.back(); }
251 MachineBasicBlock & back() { return BasicBlocks.back(); }
253 void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
254 void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
255 void insert(iterator MBBI, MachineBasicBlock *MBB) {
256 BasicBlocks.insert(MBBI, MBB);
258 void splice(iterator InsertPt, iterator MBBI) {
259 BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
262 void remove(iterator MBBI) {
263 BasicBlocks.remove(MBBI);
265 void erase(iterator MBBI) {
266 BasicBlocks.erase(MBBI);
269 //===--------------------------------------------------------------------===//
270 // Internal functions used to automatically number MachineBasicBlocks
273 /// getNextMBBNumber - Returns the next unique number to be assigned
274 /// to a MachineBasicBlock in this MachineFunction.
276 unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
277 MBBNumbering.push_back(MBB);
278 return (unsigned)MBBNumbering.size()-1;
281 /// removeFromMBBNumbering - Remove the specific machine basic block from our
282 /// tracker, this is only really to be used by the MachineBasicBlock
284 void removeFromMBBNumbering(unsigned N) {
285 assert(N < MBBNumbering.size() && "Illegal basic block #");
289 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
290 /// of `new MachineInstr'.
292 MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
296 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
297 /// 'Orig' instruction, identical in all ways except the the instruction
298 /// has no parent, prev, or next.
300 MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
302 /// DeleteMachineInstr - Delete the given MachineInstr.
304 void DeleteMachineInstr(MachineInstr *MI);
306 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
307 /// instead of `new MachineBasicBlock'.
309 MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
311 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
313 void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
315 //===--------------------------------------------------------------------===//
319 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
320 /// source file, line, and column. If none currently exists, create a new
321 /// DebugLocTuple, and insert it into the DebugIdMap.
322 unsigned getOrCreateDebugLocID(unsigned Src, unsigned Line, unsigned Col);
324 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
325 DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
327 /// getDefaultDebugLoc - Get the default debug location for the machine
329 DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
331 /// setDefaultDebugLoc - Get the default debug location for the machine
333 void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
336 //===--------------------------------------------------------------------===//
337 // GraphTraits specializations for function basic block graphs (CFGs)
338 //===--------------------------------------------------------------------===//
340 // Provide specializations of GraphTraits to be able to treat a
341 // machine function as a graph of machine basic blocks... these are
342 // the same as the machine basic block iterators, except that the root
343 // node is implicitly the first node of the function.
345 template <> struct GraphTraits<MachineFunction*> :
346 public GraphTraits<MachineBasicBlock*> {
347 static NodeType *getEntryNode(MachineFunction *F) {
351 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
352 typedef MachineFunction::iterator nodes_iterator;
353 static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
354 static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
356 template <> struct GraphTraits<const MachineFunction*> :
357 public GraphTraits<const MachineBasicBlock*> {
358 static NodeType *getEntryNode(const MachineFunction *F) {
362 // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
363 typedef MachineFunction::const_iterator nodes_iterator;
364 static nodes_iterator nodes_begin(const MachineFunction *F) { return F->begin(); }
365 static nodes_iterator nodes_end (const MachineFunction *F) { return F->end(); }
369 // Provide specializations of GraphTraits to be able to treat a function as a
370 // graph of basic blocks... and to walk it in inverse order. Inverse order for
371 // a function is considered to be when traversing the predecessor edges of a BB
372 // instead of the successor edges.
374 template <> struct GraphTraits<Inverse<MachineFunction*> > :
375 public GraphTraits<Inverse<MachineBasicBlock*> > {
376 static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
377 return &G.Graph->front();
380 template <> struct GraphTraits<Inverse<const MachineFunction*> > :
381 public GraphTraits<Inverse<const MachineBasicBlock*> > {
382 static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
383 return &G.Graph->front();
387 } // End llvm namespace