1 //===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the SelectionDAG class, and transitively defines the
11 // SDNode class and subclasses.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CODEGEN_SELECTIONDAG_H
16 #define LLVM_CODEGEN_SELECTIONDAG_H
18 #include "llvm/CodeGen/SelectionDAGNodes.h"
19 #include "llvm/CodeGen/SelectionDAGCSEMap.h"
20 #include "llvm/ADT/ilist"
30 class MachineDebugInfo;
31 class MachineFunction;
33 /// SDVTList - This represents a list of ValueType's that has been intern'd by
34 /// a SelectionDAG. Instances of this simple value class are returned by
35 /// SelectionDAG::getVTList(...).
38 const MVT::ValueType *VTs;
39 unsigned short NumVTs;
42 /// SelectionDAG class - This is used to represent a portion of an LLVM function
43 /// in a low-level Data Dependence DAG representation suitable for instruction
44 /// selection. This DAG is constructed as the first step of instruction
45 /// selection in order to allow implementation of machine specific optimizations
46 /// and code simplifications.
48 /// The representation used by the SelectionDAG is a target-independent
49 /// representation, which has some similarities to the GCC RTL representation,
50 /// but is significantly more simple, powerful, and is a graph form instead of a
58 /// Root - The root of the entire DAG. EntryNode - The starting token.
59 SDOperand Root, EntryNode;
61 /// AllNodes - A linked list of nodes in the current DAG.
62 ilist<SDNode> AllNodes;
64 /// CSEMap - This structure is used to memoize nodes, automatically performing
65 /// CSE with existing nodes with a duplicate is requested.
66 SelectionDAGCSEMap CSEMap;
69 SelectionDAG(TargetLowering &tli, MachineFunction &mf, MachineDebugInfo *di)
70 : TLI(tli), MF(mf), DI(di) {
71 EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
75 MachineFunction &getMachineFunction() const { return MF; }
76 const TargetMachine &getTarget() const;
77 TargetLowering &getTargetLoweringInfo() const { return TLI; }
78 MachineDebugInfo *getMachineDebugInfo() const { return DI; }
80 /// viewGraph - Pop up a ghostview window with the DAG rendered using 'dot'.
85 typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
86 allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
87 allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
88 typedef ilist<SDNode>::iterator allnodes_iterator;
89 allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
90 allnodes_iterator allnodes_end() { return AllNodes.end(); }
92 /// getRoot - Return the root tag of the SelectionDAG.
94 const SDOperand &getRoot() const { return Root; }
96 /// getEntryNode - Return the token chain corresponding to the entry of the
98 const SDOperand &getEntryNode() const { return EntryNode; }
100 /// setRoot - Set the current root tag of the SelectionDAG.
102 const SDOperand &setRoot(SDOperand N) { return Root = N; }
104 /// Combine - This iterates over the nodes in the SelectionDAG, folding
105 /// certain types of nodes together, or eliminating superfluous nodes. When
106 /// the AfterLegalize argument is set to 'true', Combine takes care not to
107 /// generate any nodes that will be illegal on the target.
108 void Combine(bool AfterLegalize);
110 /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
111 /// compatible with the target instruction selector, as indicated by the
112 /// TargetLowering object.
114 /// Note that this is an involved process that may invalidate pointers into
118 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
120 void RemoveDeadNodes();
122 /// getVTList - Return an SDVTList that represents the list of values
124 SDVTList getVTList(MVT::ValueType VT);
125 SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2);
126 SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2,MVT::ValueType VT3);
127 SDVTList getVTList(const MVT::ValueType *VTs, unsigned NumVTs);
129 /// getNodeValueTypes - These are obsolete, use getVTList instead.
130 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT) {
131 return getVTList(VT).VTs;
133 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,
134 MVT::ValueType VT2) {
135 return getVTList(VT1, VT2).VTs;
137 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,MVT::ValueType VT2,
138 MVT::ValueType VT3) {
139 return getVTList(VT1, VT2, VT3).VTs;
141 const MVT::ValueType *getNodeValueTypes(std::vector<MVT::ValueType> &VTList) {
142 return getVTList(&VTList[0], VTList.size()).VTs;
146 //===----------------------------------------------------------------------===//
147 // Node creation methods.
149 SDOperand getString(const std::string &Val);
150 SDOperand getConstant(uint64_t Val, MVT::ValueType VT, bool isTarget = false);
151 SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT) {
152 return getConstant(Val, VT, true);
154 SDOperand getConstantFP(double Val, MVT::ValueType VT, bool isTarget = false);
155 SDOperand getTargetConstantFP(double Val, MVT::ValueType VT) {
156 return getConstantFP(Val, VT, true);
158 SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
159 int offset = 0, bool isTargetGA = false);
160 SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
162 return getGlobalAddress(GV, VT, offset, true);
164 SDOperand getFrameIndex(int FI, MVT::ValueType VT, bool isTarget = false);
165 SDOperand getTargetFrameIndex(int FI, MVT::ValueType VT) {
166 return getFrameIndex(FI, VT, true);
168 SDOperand getJumpTable(int JTI, MVT::ValueType VT, bool isTarget = false);
169 SDOperand getTargetJumpTable(int JTI, MVT::ValueType VT) {
170 return getJumpTable(JTI, VT, true);
172 SDOperand getConstantPool(Constant *C, MVT::ValueType VT,
173 unsigned Align = 0, int Offs = 0, bool isT=false);
174 SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT,
175 unsigned Align = 0, int Offset = 0) {
176 return getConstantPool(C, VT, Align, Offset, true);
178 SDOperand getBasicBlock(MachineBasicBlock *MBB);
179 SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
180 SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
181 SDOperand getValueType(MVT::ValueType);
182 SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
184 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
185 return getNode(ISD::CopyToReg, MVT::Other, Chain,
186 getRegister(Reg, N.getValueType()), N);
189 // This version of the getCopyToReg method takes an extra operand, which
190 // indicates that there is potentially an incoming flag value (if Flag is not
191 // null) and that there should be a flag result.
192 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
194 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
195 SDOperand Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
196 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
199 // Similar to last getCopyToReg() except parameter Reg is a SDOperand
200 SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
202 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
203 SDOperand Ops[] = { Chain, Reg, N, Flag };
204 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
207 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
208 const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other);
209 SDOperand Ops[] = { Chain, getRegister(Reg, VT) };
210 return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2);
213 // This version of the getCopyFromReg method takes an extra operand, which
214 // indicates that there is potentially an incoming flag value (if Flag is not
215 // null) and that there should be a flag result.
216 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
218 const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag);
219 SDOperand Ops[] = { Chain, getRegister(Reg, VT), Flag };
220 return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.Val ? 3 : 2);
223 SDOperand getCondCode(ISD::CondCode Cond);
225 /// getZeroExtendInReg - Return the expression required to zero extend the Op
226 /// value assuming it was the smaller SrcTy value.
227 SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
229 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
230 /// a flag result (to ensure it's not CSE'd).
231 SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
232 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
233 SDOperand Ops[] = { Chain, Op };
234 return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2);
237 /// getNode - Gets or creates the specified node.
239 SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
240 SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
241 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
242 SDOperand N1, SDOperand N2);
243 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
244 SDOperand N1, SDOperand N2, SDOperand N3);
245 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
246 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
247 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
248 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
250 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
251 const SDOperand *Ops, unsigned NumOps);
252 SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
253 const SDOperand *Ops, unsigned NumOps);
254 SDOperand getNode(unsigned Opcode, const MVT::ValueType *VTs, unsigned NumVTs,
255 const SDOperand *Ops, unsigned NumOps);
257 /// getSetCC - Helper function to make it easier to build SetCC's if you just
258 /// have an ISD::CondCode instead of an SDOperand.
260 SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
261 ISD::CondCode Cond) {
262 return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
265 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
266 /// just have an ISD::CondCode instead of an SDOperand.
268 SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
269 SDOperand True, SDOperand False, ISD::CondCode Cond) {
270 return getNode(ISD::SELECT_CC, True.getValueType(), LHS, RHS, True, False,
274 /// getVAArg - VAArg produces a result and token chain, and takes a pointer
275 /// and a source value as input.
276 SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
279 /// getLoad - Loads are not normal binary operators: their result type is not
280 /// determined by their operands, and they produce a value AND a token chain.
282 SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
284 SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
285 SDOperand Ptr, SDOperand SV);
286 SDOperand getExtLoad(unsigned Opcode, MVT::ValueType VT, SDOperand Chain,
287 SDOperand Ptr, SDOperand SV, MVT::ValueType EVT);
289 // getSrcValue - construct a node to track a Value* through the backend
290 SDOperand getSrcValue(const Value* I, int offset = 0);
292 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
293 /// specified operands. If the resultant node already exists in the DAG,
294 /// this does not modify the specified node, instead it returns the node that
295 /// already exists. If the resultant node does not exist in the DAG, the
296 /// input node is returned. As a degenerate case, if you specify the same
297 /// input operands as the node already has, the input node is returned.
298 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
299 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
300 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
302 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
303 SDOperand Op3, SDOperand Op4);
304 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
305 SDOperand Op3, SDOperand Op4, SDOperand Op5);
306 SDOperand UpdateNodeOperands(SDOperand N, SDOperand *Ops, unsigned NumOps);
308 /// SelectNodeTo - These are used for target selectors to *mutate* the
309 /// specified node to have the specified return type, Target opcode, and
310 /// operands. Note that target opcodes are stored as
311 /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
312 /// of the resultant node is returned.
313 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
314 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
316 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
317 SDOperand Op1, SDOperand Op2);
318 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
319 SDOperand Op1, SDOperand Op2, SDOperand Op3);
320 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
321 SDOperand Op1, SDOperand Op2, SDOperand Op3,
323 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
324 SDOperand Op1, SDOperand Op2, SDOperand Op3,
325 SDOperand Op4, SDOperand Op5);
326 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
327 SDOperand Op1, SDOperand Op2, SDOperand Op3,
328 SDOperand Op4, SDOperand Op5, SDOperand Op6);
329 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
330 SDOperand Op1, SDOperand Op2, SDOperand Op3,
331 SDOperand Op4, SDOperand Op5, SDOperand Op6,
333 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
334 SDOperand Op1, SDOperand Op2, SDOperand Op3,
335 SDOperand Op4, SDOperand Op5, SDOperand Op6,
336 SDOperand Op7, SDOperand Op8);
337 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
338 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
339 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
340 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
342 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
343 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
344 SDOperand Op3, SDOperand Op4);
345 SDOperand SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
346 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
347 SDOperand Op3, SDOperand Op4, SDOperand Op5);
349 /// getTargetNode - These are used for target selectors to create a new node
350 /// with specified return type(s), target opcode, and operands.
352 /// Note that getTargetNode returns the resultant node. If there is already a
353 /// node of the specified opcode and operands, it returns that node instead of
355 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT);
356 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
358 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
359 SDOperand Op1, SDOperand Op2);
360 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
361 SDOperand Op1, SDOperand Op2, SDOperand Op3);
362 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
363 SDOperand Op1, SDOperand Op2, SDOperand Op3,
365 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
366 SDOperand Op1, SDOperand Op2, SDOperand Op3,
367 SDOperand Op4, SDOperand Op5);
368 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
369 SDOperand Op1, SDOperand Op2, SDOperand Op3,
370 SDOperand Op4, SDOperand Op5, SDOperand Op6);
371 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
372 SDOperand Op1, SDOperand Op2, SDOperand Op3,
373 SDOperand Op4, SDOperand Op5, SDOperand Op6,
375 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
376 SDOperand Op1, SDOperand Op2, SDOperand Op3,
377 SDOperand Op4, SDOperand Op5, SDOperand Op6,
378 SDOperand Op7, SDOperand Op8);
379 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
380 const SDOperand *Ops, unsigned NumOps);
381 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
382 MVT::ValueType VT2, SDOperand Op1);
383 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
384 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
385 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
386 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
388 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
389 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
390 SDOperand Op3, SDOperand Op4);
391 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
392 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
393 SDOperand Op3, SDOperand Op4, SDOperand Op5);
394 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
395 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
396 SDOperand Op3, SDOperand Op4, SDOperand Op5,
398 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
399 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
400 SDOperand Op3, SDOperand Op4, SDOperand Op5,
401 SDOperand Op6, SDOperand Op7);
402 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
403 MVT::ValueType VT2, MVT::ValueType VT3,
404 SDOperand Op1, SDOperand Op2);
405 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
406 MVT::ValueType VT2, MVT::ValueType VT3,
407 SDOperand Op1, SDOperand Op2,
408 SDOperand Op3, SDOperand Op4, SDOperand Op5);
409 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
410 MVT::ValueType VT2, MVT::ValueType VT3,
411 SDOperand Op1, SDOperand Op2,
412 SDOperand Op3, SDOperand Op4, SDOperand Op5,
414 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
415 MVT::ValueType VT2, MVT::ValueType VT3,
416 SDOperand Op1, SDOperand Op2,
417 SDOperand Op3, SDOperand Op4, SDOperand Op5,
418 SDOperand Op6, SDOperand Op7);
419 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
421 const SDOperand *Ops, unsigned NumOps);
423 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
424 /// This can cause recursive merging of nodes in the DAG. Use the first
425 /// version if 'From' is known to have a single result, use the second
426 /// if you have two nodes with identical results, use the third otherwise.
428 /// These methods all take an optional vector, which (if not null) is
429 /// populated with any nodes that are deleted from the SelectionDAG, due to
430 /// new equivalences that are discovered.
432 void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
433 std::vector<SDNode*> *Deleted = 0);
434 void ReplaceAllUsesWith(SDNode *From, SDNode *To,
435 std::vector<SDNode*> *Deleted = 0);
436 void ReplaceAllUsesWith(SDNode *From, const SDOperand *To,
437 std::vector<SDNode*> *Deleted = 0);
439 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
440 /// uses of other values produced by From.Val alone. The Deleted vector is
441 /// handled the same was as for ReplaceAllUsesWith, but it is required for
443 void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
444 std::vector<SDNode*> &Deleted);
446 /// DeleteNode - Remove the specified node from the system. This node must
447 /// have no referrers.
448 void DeleteNode(SDNode *N);
450 /// AssignNodeIds - Assign a unique node id for each node in the DAG based on
451 /// their allnodes order. It returns the maximum id.
452 unsigned AssignNodeIds();
454 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
455 /// based on their topological order. It returns the maximum id and a vector
456 /// of the SDNodes* in assigned order by reference.
457 unsigned AssignTopologicalOrder(std::vector<SDNode*> &TopOrder);
462 void RemoveNodeFromCSEMaps(SDNode *N);
463 SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
464 SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op, void *&InsertPos);
465 SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2,
467 SDNode *FindModifiedNodeSlot(SDNode *N, const SDOperand *Ops, unsigned NumOps,
470 void DeleteNodeNotInCSEMaps(SDNode *N);
472 /// SimplifySetCC - Try to simplify a setcc built with the specified operands
473 /// and cc. If unable to simplify it, return a null SDOperand.
474 SDOperand SimplifySetCC(MVT::ValueType VT, SDOperand N1,
475 SDOperand N2, ISD::CondCode Cond);
477 // List of non-single value types.
478 std::list<std::vector<MVT::ValueType> > VTList;
480 // Maps to auto-CSE operations.
481 std::vector<CondCodeSDNode*> CondCodeNodes;
483 std::vector<SDNode*> ValueTypeNodes;
484 std::map<std::string, SDNode*> ExternalSymbols;
485 std::map<std::string, SDNode*> TargetExternalSymbols;
486 std::map<std::string, StringSDNode*> StringNodes;
489 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
490 typedef SelectionDAG::allnodes_iterator nodes_iterator;
491 static nodes_iterator nodes_begin(SelectionDAG *G) {
492 return G->allnodes_begin();
494 static nodes_iterator nodes_end(SelectionDAG *G) {
495 return G->allnodes_end();
499 } // end namespace llvm