1 //===-- Instruction.cpp - Implement the Instruction class -----------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Instruction class for the IR library.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/IR/Instruction.h"
15 #include "llvm/IR/IntrinsicInst.h"
16 #include "llvm/ADT/DenseSet.h"
17 #include "llvm/IR/Constants.h"
18 #include "llvm/IR/Instructions.h"
19 #include "llvm/IR/MDBuilder.h"
20 #include "llvm/IR/Operator.h"
21 #include "llvm/IR/Type.h"
22 using namespace llvm;
23
Instruction(Type * ty,unsigned it,Use * Ops,unsigned NumOps,Instruction * InsertBefore)24 Instruction::Instruction(Type *ty, unsigned it, Use *Ops, unsigned NumOps,
25 Instruction *InsertBefore)
26 : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(nullptr) {
27
28 // If requested, insert this instruction into a basic block...
29 if (InsertBefore) {
30 BasicBlock *BB = InsertBefore->getParent();
31 assert(BB && "Instruction to insert before is not in a basic block!");
32 BB->getInstList().insert(InsertBefore->getIterator(), this);
33 }
34 }
35
Instruction(Type * ty,unsigned it,Use * Ops,unsigned NumOps,BasicBlock * InsertAtEnd)36 Instruction::Instruction(Type *ty, unsigned it, Use *Ops, unsigned NumOps,
37 BasicBlock *InsertAtEnd)
38 : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(nullptr) {
39
40 // append this instruction into the basic block
41 assert(InsertAtEnd && "Basic block to append to may not be NULL!");
42 InsertAtEnd->getInstList().push_back(this);
43 }
44
~Instruction()45 Instruction::~Instruction() {
46 assert(!Parent && "Instruction still linked in the program!");
47 if (hasMetadataHashEntry())
48 clearMetadataHashEntries();
49 }
50
51
setParent(BasicBlock * P)52 void Instruction::setParent(BasicBlock *P) {
53 Parent = P;
54 }
55
getModule() const56 const Module *Instruction::getModule() const {
57 return getParent()->getModule();
58 }
59
getFunction() const60 const Function *Instruction::getFunction() const {
61 return getParent()->getParent();
62 }
63
removeFromParent()64 void Instruction::removeFromParent() {
65 getParent()->getInstList().remove(getIterator());
66 }
67
eraseFromParent()68 iplist<Instruction>::iterator Instruction::eraseFromParent() {
69 return getParent()->getInstList().erase(getIterator());
70 }
71
72 /// Insert an unlinked instruction into a basic block immediately before the
73 /// specified instruction.
insertBefore(Instruction * InsertPos)74 void Instruction::insertBefore(Instruction *InsertPos) {
75 InsertPos->getParent()->getInstList().insert(InsertPos->getIterator(), this);
76 }
77
78 /// Insert an unlinked instruction into a basic block immediately after the
79 /// specified instruction.
insertAfter(Instruction * InsertPos)80 void Instruction::insertAfter(Instruction *InsertPos) {
81 InsertPos->getParent()->getInstList().insertAfter(InsertPos->getIterator(),
82 this);
83 }
84
85 /// Unlink this instruction from its current basic block and insert it into the
86 /// basic block that MovePos lives in, right before MovePos.
moveBefore(Instruction * MovePos)87 void Instruction::moveBefore(Instruction *MovePos) {
88 moveBefore(*MovePos->getParent(), MovePos->getIterator());
89 }
90
moveAfter(Instruction * MovePos)91 void Instruction::moveAfter(Instruction *MovePos) {
92 moveBefore(*MovePos->getParent(), ++MovePos->getIterator());
93 }
94
moveBefore(BasicBlock & BB,SymbolTableList<Instruction>::iterator I)95 void Instruction::moveBefore(BasicBlock &BB,
96 SymbolTableList<Instruction>::iterator I) {
97 assert(I == BB.end() || I->getParent() == &BB);
98 BB.getInstList().splice(I, getParent()->getInstList(), getIterator());
99 }
100
setHasNoUnsignedWrap(bool b)101 void Instruction::setHasNoUnsignedWrap(bool b) {
102 cast<OverflowingBinaryOperator>(this)->setHasNoUnsignedWrap(b);
103 }
104
setHasNoSignedWrap(bool b)105 void Instruction::setHasNoSignedWrap(bool b) {
106 cast<OverflowingBinaryOperator>(this)->setHasNoSignedWrap(b);
107 }
108
setIsExact(bool b)109 void Instruction::setIsExact(bool b) {
110 cast<PossiblyExactOperator>(this)->setIsExact(b);
111 }
112
hasNoUnsignedWrap() const113 bool Instruction::hasNoUnsignedWrap() const {
114 return cast<OverflowingBinaryOperator>(this)->hasNoUnsignedWrap();
115 }
116
hasNoSignedWrap() const117 bool Instruction::hasNoSignedWrap() const {
118 return cast<OverflowingBinaryOperator>(this)->hasNoSignedWrap();
119 }
120
dropPoisonGeneratingFlags()121 void Instruction::dropPoisonGeneratingFlags() {
122 switch (getOpcode()) {
123 case Instruction::Add:
124 case Instruction::Sub:
125 case Instruction::Mul:
126 case Instruction::Shl:
127 cast<OverflowingBinaryOperator>(this)->setHasNoUnsignedWrap(false);
128 cast<OverflowingBinaryOperator>(this)->setHasNoSignedWrap(false);
129 break;
130
131 case Instruction::UDiv:
132 case Instruction::SDiv:
133 case Instruction::AShr:
134 case Instruction::LShr:
135 cast<PossiblyExactOperator>(this)->setIsExact(false);
136 break;
137
138 case Instruction::GetElementPtr:
139 cast<GetElementPtrInst>(this)->setIsInBounds(false);
140 break;
141 }
142 }
143
isExact() const144 bool Instruction::isExact() const {
145 return cast<PossiblyExactOperator>(this)->isExact();
146 }
147
setFast(bool B)148 void Instruction::setFast(bool B) {
149 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
150 cast<FPMathOperator>(this)->setFast(B);
151 }
152
setHasAllowReassoc(bool B)153 void Instruction::setHasAllowReassoc(bool B) {
154 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
155 cast<FPMathOperator>(this)->setHasAllowReassoc(B);
156 }
157
setHasNoNaNs(bool B)158 void Instruction::setHasNoNaNs(bool B) {
159 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
160 cast<FPMathOperator>(this)->setHasNoNaNs(B);
161 }
162
setHasNoInfs(bool B)163 void Instruction::setHasNoInfs(bool B) {
164 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
165 cast<FPMathOperator>(this)->setHasNoInfs(B);
166 }
167
setHasNoSignedZeros(bool B)168 void Instruction::setHasNoSignedZeros(bool B) {
169 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
170 cast<FPMathOperator>(this)->setHasNoSignedZeros(B);
171 }
172
setHasAllowReciprocal(bool B)173 void Instruction::setHasAllowReciprocal(bool B) {
174 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
175 cast<FPMathOperator>(this)->setHasAllowReciprocal(B);
176 }
177
setHasApproxFunc(bool B)178 void Instruction::setHasApproxFunc(bool B) {
179 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
180 cast<FPMathOperator>(this)->setHasApproxFunc(B);
181 }
182
setFastMathFlags(FastMathFlags FMF)183 void Instruction::setFastMathFlags(FastMathFlags FMF) {
184 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
185 cast<FPMathOperator>(this)->setFastMathFlags(FMF);
186 }
187
copyFastMathFlags(FastMathFlags FMF)188 void Instruction::copyFastMathFlags(FastMathFlags FMF) {
189 assert(isa<FPMathOperator>(this) && "copying fast-math flag on invalid op");
190 cast<FPMathOperator>(this)->copyFastMathFlags(FMF);
191 }
192
isFast() const193 bool Instruction::isFast() const {
194 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
195 return cast<FPMathOperator>(this)->isFast();
196 }
197
hasAllowReassoc() const198 bool Instruction::hasAllowReassoc() const {
199 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
200 return cast<FPMathOperator>(this)->hasAllowReassoc();
201 }
202
hasNoNaNs() const203 bool Instruction::hasNoNaNs() const {
204 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
205 return cast<FPMathOperator>(this)->hasNoNaNs();
206 }
207
hasNoInfs() const208 bool Instruction::hasNoInfs() const {
209 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
210 return cast<FPMathOperator>(this)->hasNoInfs();
211 }
212
hasNoSignedZeros() const213 bool Instruction::hasNoSignedZeros() const {
214 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
215 return cast<FPMathOperator>(this)->hasNoSignedZeros();
216 }
217
hasAllowReciprocal() const218 bool Instruction::hasAllowReciprocal() const {
219 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
220 return cast<FPMathOperator>(this)->hasAllowReciprocal();
221 }
222
hasAllowContract() const223 bool Instruction::hasAllowContract() const {
224 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
225 return cast<FPMathOperator>(this)->hasAllowContract();
226 }
227
hasApproxFunc() const228 bool Instruction::hasApproxFunc() const {
229 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
230 return cast<FPMathOperator>(this)->hasApproxFunc();
231 }
232
getFastMathFlags() const233 FastMathFlags Instruction::getFastMathFlags() const {
234 assert(isa<FPMathOperator>(this) && "getting fast-math flag on invalid op");
235 return cast<FPMathOperator>(this)->getFastMathFlags();
236 }
237
copyFastMathFlags(const Instruction * I)238 void Instruction::copyFastMathFlags(const Instruction *I) {
239 copyFastMathFlags(I->getFastMathFlags());
240 }
241
copyIRFlags(const Value * V,bool IncludeWrapFlags)242 void Instruction::copyIRFlags(const Value *V, bool IncludeWrapFlags) {
243 // Copy the wrapping flags.
244 if (IncludeWrapFlags && isa<OverflowingBinaryOperator>(this)) {
245 if (auto *OB = dyn_cast<OverflowingBinaryOperator>(V)) {
246 setHasNoSignedWrap(OB->hasNoSignedWrap());
247 setHasNoUnsignedWrap(OB->hasNoUnsignedWrap());
248 }
249 }
250
251 // Copy the exact flag.
252 if (auto *PE = dyn_cast<PossiblyExactOperator>(V))
253 if (isa<PossiblyExactOperator>(this))
254 setIsExact(PE->isExact());
255
256 // Copy the fast-math flags.
257 if (auto *FP = dyn_cast<FPMathOperator>(V))
258 if (isa<FPMathOperator>(this))
259 copyFastMathFlags(FP->getFastMathFlags());
260
261 if (auto *SrcGEP = dyn_cast<GetElementPtrInst>(V))
262 if (auto *DestGEP = dyn_cast<GetElementPtrInst>(this))
263 DestGEP->setIsInBounds(SrcGEP->isInBounds() | DestGEP->isInBounds());
264 }
265
andIRFlags(const Value * V)266 void Instruction::andIRFlags(const Value *V) {
267 if (auto *OB = dyn_cast<OverflowingBinaryOperator>(V)) {
268 if (isa<OverflowingBinaryOperator>(this)) {
269 setHasNoSignedWrap(hasNoSignedWrap() & OB->hasNoSignedWrap());
270 setHasNoUnsignedWrap(hasNoUnsignedWrap() & OB->hasNoUnsignedWrap());
271 }
272 }
273
274 if (auto *PE = dyn_cast<PossiblyExactOperator>(V))
275 if (isa<PossiblyExactOperator>(this))
276 setIsExact(isExact() & PE->isExact());
277
278 if (auto *FP = dyn_cast<FPMathOperator>(V)) {
279 if (isa<FPMathOperator>(this)) {
280 FastMathFlags FM = getFastMathFlags();
281 FM &= FP->getFastMathFlags();
282 copyFastMathFlags(FM);
283 }
284 }
285
286 if (auto *SrcGEP = dyn_cast<GetElementPtrInst>(V))
287 if (auto *DestGEP = dyn_cast<GetElementPtrInst>(this))
288 DestGEP->setIsInBounds(SrcGEP->isInBounds() & DestGEP->isInBounds());
289 }
290
getOpcodeName(unsigned OpCode)291 const char *Instruction::getOpcodeName(unsigned OpCode) {
292 switch (OpCode) {
293 // Terminators
294 case Ret: return "ret";
295 case Br: return "br";
296 case Switch: return "switch";
297 case IndirectBr: return "indirectbr";
298 case Invoke: return "invoke";
299 case Resume: return "resume";
300 case Unreachable: return "unreachable";
301 case CleanupRet: return "cleanupret";
302 case CatchRet: return "catchret";
303 case CatchPad: return "catchpad";
304 case CatchSwitch: return "catchswitch";
305
306 // Standard unary operators...
307 case FNeg: return "fneg";
308
309 // Standard binary operators...
310 case Add: return "add";
311 case FAdd: return "fadd";
312 case Sub: return "sub";
313 case FSub: return "fsub";
314 case Mul: return "mul";
315 case FMul: return "fmul";
316 case UDiv: return "udiv";
317 case SDiv: return "sdiv";
318 case FDiv: return "fdiv";
319 case URem: return "urem";
320 case SRem: return "srem";
321 case FRem: return "frem";
322
323 // Logical operators...
324 case And: return "and";
325 case Or : return "or";
326 case Xor: return "xor";
327
328 // Memory instructions...
329 case Alloca: return "alloca";
330 case Load: return "load";
331 case Store: return "store";
332 case AtomicCmpXchg: return "cmpxchg";
333 case AtomicRMW: return "atomicrmw";
334 case Fence: return "fence";
335 case GetElementPtr: return "getelementptr";
336
337 // Convert instructions...
338 case Trunc: return "trunc";
339 case ZExt: return "zext";
340 case SExt: return "sext";
341 case FPTrunc: return "fptrunc";
342 case FPExt: return "fpext";
343 case FPToUI: return "fptoui";
344 case FPToSI: return "fptosi";
345 case UIToFP: return "uitofp";
346 case SIToFP: return "sitofp";
347 case IntToPtr: return "inttoptr";
348 case PtrToInt: return "ptrtoint";
349 case BitCast: return "bitcast";
350 case AddrSpaceCast: return "addrspacecast";
351
352 // Other instructions...
353 case ICmp: return "icmp";
354 case FCmp: return "fcmp";
355 case PHI: return "phi";
356 case Select: return "select";
357 case Call: return "call";
358 case Shl: return "shl";
359 case LShr: return "lshr";
360 case AShr: return "ashr";
361 case VAArg: return "va_arg";
362 case ExtractElement: return "extractelement";
363 case InsertElement: return "insertelement";
364 case ShuffleVector: return "shufflevector";
365 case ExtractValue: return "extractvalue";
366 case InsertValue: return "insertvalue";
367 case LandingPad: return "landingpad";
368 case CleanupPad: return "cleanuppad";
369
370 default: return "<Invalid operator> ";
371 }
372 }
373
374 /// Return true if both instructions have the same special state. This must be
375 /// kept in sync with FunctionComparator::cmpOperations in
376 /// lib/Transforms/IPO/MergeFunctions.cpp.
haveSameSpecialState(const Instruction * I1,const Instruction * I2,bool IgnoreAlignment=false)377 static bool haveSameSpecialState(const Instruction *I1, const Instruction *I2,
378 bool IgnoreAlignment = false) {
379 assert(I1->getOpcode() == I2->getOpcode() &&
380 "Can not compare special state of different instructions");
381
382 if (const AllocaInst *AI = dyn_cast<AllocaInst>(I1))
383 return AI->getAllocatedType() == cast<AllocaInst>(I2)->getAllocatedType() &&
384 (AI->getAlignment() == cast<AllocaInst>(I2)->getAlignment() ||
385 IgnoreAlignment);
386 if (const LoadInst *LI = dyn_cast<LoadInst>(I1))
387 return LI->isVolatile() == cast<LoadInst>(I2)->isVolatile() &&
388 (LI->getAlignment() == cast<LoadInst>(I2)->getAlignment() ||
389 IgnoreAlignment) &&
390 LI->getOrdering() == cast<LoadInst>(I2)->getOrdering() &&
391 LI->getSyncScopeID() == cast<LoadInst>(I2)->getSyncScopeID();
392 if (const StoreInst *SI = dyn_cast<StoreInst>(I1))
393 return SI->isVolatile() == cast<StoreInst>(I2)->isVolatile() &&
394 (SI->getAlignment() == cast<StoreInst>(I2)->getAlignment() ||
395 IgnoreAlignment) &&
396 SI->getOrdering() == cast<StoreInst>(I2)->getOrdering() &&
397 SI->getSyncScopeID() == cast<StoreInst>(I2)->getSyncScopeID();
398 if (const CmpInst *CI = dyn_cast<CmpInst>(I1))
399 return CI->getPredicate() == cast<CmpInst>(I2)->getPredicate();
400 if (const CallInst *CI = dyn_cast<CallInst>(I1))
401 return CI->isTailCall() == cast<CallInst>(I2)->isTailCall() &&
402 CI->getCallingConv() == cast<CallInst>(I2)->getCallingConv() &&
403 CI->getAttributes() == cast<CallInst>(I2)->getAttributes() &&
404 CI->hasIdenticalOperandBundleSchema(*cast<CallInst>(I2));
405 if (const InvokeInst *CI = dyn_cast<InvokeInst>(I1))
406 return CI->getCallingConv() == cast<InvokeInst>(I2)->getCallingConv() &&
407 CI->getAttributes() == cast<InvokeInst>(I2)->getAttributes() &&
408 CI->hasIdenticalOperandBundleSchema(*cast<InvokeInst>(I2));
409 if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(I1))
410 return IVI->getIndices() == cast<InsertValueInst>(I2)->getIndices();
411 if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(I1))
412 return EVI->getIndices() == cast<ExtractValueInst>(I2)->getIndices();
413 if (const FenceInst *FI = dyn_cast<FenceInst>(I1))
414 return FI->getOrdering() == cast<FenceInst>(I2)->getOrdering() &&
415 FI->getSyncScopeID() == cast<FenceInst>(I2)->getSyncScopeID();
416 if (const AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(I1))
417 return CXI->isVolatile() == cast<AtomicCmpXchgInst>(I2)->isVolatile() &&
418 CXI->isWeak() == cast<AtomicCmpXchgInst>(I2)->isWeak() &&
419 CXI->getSuccessOrdering() ==
420 cast<AtomicCmpXchgInst>(I2)->getSuccessOrdering() &&
421 CXI->getFailureOrdering() ==
422 cast<AtomicCmpXchgInst>(I2)->getFailureOrdering() &&
423 CXI->getSyncScopeID() ==
424 cast<AtomicCmpXchgInst>(I2)->getSyncScopeID();
425 if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I1))
426 return RMWI->getOperation() == cast<AtomicRMWInst>(I2)->getOperation() &&
427 RMWI->isVolatile() == cast<AtomicRMWInst>(I2)->isVolatile() &&
428 RMWI->getOrdering() == cast<AtomicRMWInst>(I2)->getOrdering() &&
429 RMWI->getSyncScopeID() == cast<AtomicRMWInst>(I2)->getSyncScopeID();
430
431 return true;
432 }
433
isIdenticalTo(const Instruction * I) const434 bool Instruction::isIdenticalTo(const Instruction *I) const {
435 return isIdenticalToWhenDefined(I) &&
436 SubclassOptionalData == I->SubclassOptionalData;
437 }
438
isIdenticalToWhenDefined(const Instruction * I) const439 bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
440 if (getOpcode() != I->getOpcode() ||
441 getNumOperands() != I->getNumOperands() ||
442 getType() != I->getType())
443 return false;
444
445 // If both instructions have no operands, they are identical.
446 if (getNumOperands() == 0 && I->getNumOperands() == 0)
447 return haveSameSpecialState(this, I);
448
449 // We have two instructions of identical opcode and #operands. Check to see
450 // if all operands are the same.
451 if (!std::equal(op_begin(), op_end(), I->op_begin()))
452 return false;
453
454 if (const PHINode *thisPHI = dyn_cast<PHINode>(this)) {
455 const PHINode *otherPHI = cast<PHINode>(I);
456 return std::equal(thisPHI->block_begin(), thisPHI->block_end(),
457 otherPHI->block_begin());
458 }
459
460 return haveSameSpecialState(this, I);
461 }
462
463 // Keep this in sync with FunctionComparator::cmpOperations in
464 // lib/Transforms/IPO/MergeFunctions.cpp.
isSameOperationAs(const Instruction * I,unsigned flags) const465 bool Instruction::isSameOperationAs(const Instruction *I,
466 unsigned flags) const {
467 bool IgnoreAlignment = flags & CompareIgnoringAlignment;
468 bool UseScalarTypes = flags & CompareUsingScalarTypes;
469
470 if (getOpcode() != I->getOpcode() ||
471 getNumOperands() != I->getNumOperands() ||
472 (UseScalarTypes ?
473 getType()->getScalarType() != I->getType()->getScalarType() :
474 getType() != I->getType()))
475 return false;
476
477 // We have two instructions of identical opcode and #operands. Check to see
478 // if all operands are the same type
479 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
480 if (UseScalarTypes ?
481 getOperand(i)->getType()->getScalarType() !=
482 I->getOperand(i)->getType()->getScalarType() :
483 getOperand(i)->getType() != I->getOperand(i)->getType())
484 return false;
485
486 return haveSameSpecialState(this, I, IgnoreAlignment);
487 }
488
isUsedOutsideOfBlock(const BasicBlock * BB) const489 bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
490 for (const Use &U : uses()) {
491 // PHI nodes uses values in the corresponding predecessor block. For other
492 // instructions, just check to see whether the parent of the use matches up.
493 const Instruction *I = cast<Instruction>(U.getUser());
494 const PHINode *PN = dyn_cast<PHINode>(I);
495 if (!PN) {
496 if (I->getParent() != BB)
497 return true;
498 continue;
499 }
500
501 if (PN->getIncomingBlock(U) != BB)
502 return true;
503 }
504 return false;
505 }
506
mayReadFromMemory() const507 bool Instruction::mayReadFromMemory() const {
508 switch (getOpcode()) {
509 default: return false;
510 case Instruction::VAArg:
511 case Instruction::Load:
512 case Instruction::Fence: // FIXME: refine definition of mayReadFromMemory
513 case Instruction::AtomicCmpXchg:
514 case Instruction::AtomicRMW:
515 case Instruction::CatchPad:
516 case Instruction::CatchRet:
517 return true;
518 case Instruction::Call:
519 return !cast<CallInst>(this)->doesNotAccessMemory();
520 case Instruction::Invoke:
521 return !cast<InvokeInst>(this)->doesNotAccessMemory();
522 case Instruction::Store:
523 return !cast<StoreInst>(this)->isUnordered();
524 }
525 }
526
mayWriteToMemory() const527 bool Instruction::mayWriteToMemory() const {
528 switch (getOpcode()) {
529 default: return false;
530 case Instruction::Fence: // FIXME: refine definition of mayWriteToMemory
531 case Instruction::Store:
532 case Instruction::VAArg:
533 case Instruction::AtomicCmpXchg:
534 case Instruction::AtomicRMW:
535 case Instruction::CatchPad:
536 case Instruction::CatchRet:
537 return true;
538 case Instruction::Call:
539 return !cast<CallInst>(this)->onlyReadsMemory();
540 case Instruction::Invoke:
541 return !cast<InvokeInst>(this)->onlyReadsMemory();
542 case Instruction::Load:
543 return !cast<LoadInst>(this)->isUnordered();
544 }
545 }
546
isAtomic() const547 bool Instruction::isAtomic() const {
548 switch (getOpcode()) {
549 default:
550 return false;
551 case Instruction::AtomicCmpXchg:
552 case Instruction::AtomicRMW:
553 case Instruction::Fence:
554 return true;
555 case Instruction::Load:
556 return cast<LoadInst>(this)->getOrdering() != AtomicOrdering::NotAtomic;
557 case Instruction::Store:
558 return cast<StoreInst>(this)->getOrdering() != AtomicOrdering::NotAtomic;
559 }
560 }
561
hasAtomicLoad() const562 bool Instruction::hasAtomicLoad() const {
563 assert(isAtomic());
564 switch (getOpcode()) {
565 default:
566 return false;
567 case Instruction::AtomicCmpXchg:
568 case Instruction::AtomicRMW:
569 case Instruction::Load:
570 return true;
571 }
572 }
573
hasAtomicStore() const574 bool Instruction::hasAtomicStore() const {
575 assert(isAtomic());
576 switch (getOpcode()) {
577 default:
578 return false;
579 case Instruction::AtomicCmpXchg:
580 case Instruction::AtomicRMW:
581 case Instruction::Store:
582 return true;
583 }
584 }
585
mayThrow() const586 bool Instruction::mayThrow() const {
587 if (const CallInst *CI = dyn_cast<CallInst>(this))
588 return !CI->doesNotThrow();
589 if (const auto *CRI = dyn_cast<CleanupReturnInst>(this))
590 return CRI->unwindsToCaller();
591 if (const auto *CatchSwitch = dyn_cast<CatchSwitchInst>(this))
592 return CatchSwitch->unwindsToCaller();
593 return isa<ResumeInst>(this);
594 }
595
isSafeToRemove() const596 bool Instruction::isSafeToRemove() const {
597 return (!isa<CallInst>(this) || !this->mayHaveSideEffects()) &&
598 !this->isTerminator();
599 }
600
isLifetimeStartOrEnd() const601 bool Instruction::isLifetimeStartOrEnd() const {
602 auto II = dyn_cast<IntrinsicInst>(this);
603 if (!II)
604 return false;
605 Intrinsic::ID ID = II->getIntrinsicID();
606 return ID == Intrinsic::lifetime_start || ID == Intrinsic::lifetime_end;
607 }
608
getNextNonDebugInstruction() const609 const Instruction *Instruction::getNextNonDebugInstruction() const {
610 for (const Instruction *I = getNextNode(); I; I = I->getNextNode())
611 if (!isa<DbgInfoIntrinsic>(I))
612 return I;
613 return nullptr;
614 }
615
getPrevNonDebugInstruction() const616 const Instruction *Instruction::getPrevNonDebugInstruction() const {
617 for (const Instruction *I = getPrevNode(); I; I = I->getPrevNode())
618 if (!isa<DbgInfoIntrinsic>(I))
619 return I;
620 return nullptr;
621 }
622
isAssociative() const623 bool Instruction::isAssociative() const {
624 unsigned Opcode = getOpcode();
625 if (isAssociative(Opcode))
626 return true;
627
628 switch (Opcode) {
629 case FMul:
630 case FAdd:
631 return cast<FPMathOperator>(this)->hasAllowReassoc() &&
632 cast<FPMathOperator>(this)->hasNoSignedZeros();
633 default:
634 return false;
635 }
636 }
637
getNumSuccessors() const638 unsigned Instruction::getNumSuccessors() const {
639 switch (getOpcode()) {
640 #define HANDLE_TERM_INST(N, OPC, CLASS) \
641 case Instruction::OPC: \
642 return static_cast<const CLASS *>(this)->getNumSuccessors();
643 #include "llvm/IR/Instruction.def"
644 default:
645 break;
646 }
647 llvm_unreachable("not a terminator");
648 }
649
getSuccessor(unsigned idx) const650 BasicBlock *Instruction::getSuccessor(unsigned idx) const {
651 switch (getOpcode()) {
652 #define HANDLE_TERM_INST(N, OPC, CLASS) \
653 case Instruction::OPC: \
654 return static_cast<const CLASS *>(this)->getSuccessor(idx);
655 #include "llvm/IR/Instruction.def"
656 default:
657 break;
658 }
659 llvm_unreachable("not a terminator");
660 }
661
setSuccessor(unsigned idx,BasicBlock * B)662 void Instruction::setSuccessor(unsigned idx, BasicBlock *B) {
663 switch (getOpcode()) {
664 #define HANDLE_TERM_INST(N, OPC, CLASS) \
665 case Instruction::OPC: \
666 return static_cast<CLASS *>(this)->setSuccessor(idx, B);
667 #include "llvm/IR/Instruction.def"
668 default:
669 break;
670 }
671 llvm_unreachable("not a terminator");
672 }
673
cloneImpl() const674 Instruction *Instruction::cloneImpl() const {
675 llvm_unreachable("Subclass of Instruction failed to implement cloneImpl");
676 }
677
swapProfMetadata()678 void Instruction::swapProfMetadata() {
679 MDNode *ProfileData = getMetadata(LLVMContext::MD_prof);
680 if (!ProfileData || ProfileData->getNumOperands() != 3 ||
681 !isa<MDString>(ProfileData->getOperand(0)))
682 return;
683
684 MDString *MDName = cast<MDString>(ProfileData->getOperand(0));
685 if (MDName->getString() != "branch_weights")
686 return;
687
688 // The first operand is the name. Fetch them backwards and build a new one.
689 Metadata *Ops[] = {ProfileData->getOperand(0), ProfileData->getOperand(2),
690 ProfileData->getOperand(1)};
691 setMetadata(LLVMContext::MD_prof,
692 MDNode::get(ProfileData->getContext(), Ops));
693 }
694
copyMetadata(const Instruction & SrcInst,ArrayRef<unsigned> WL)695 void Instruction::copyMetadata(const Instruction &SrcInst,
696 ArrayRef<unsigned> WL) {
697 if (!SrcInst.hasMetadata())
698 return;
699
700 DenseSet<unsigned> WLS;
701 for (unsigned M : WL)
702 WLS.insert(M);
703
704 // Otherwise, enumerate and copy over metadata from the old instruction to the
705 // new one.
706 SmallVector<std::pair<unsigned, MDNode *>, 4> TheMDs;
707 SrcInst.getAllMetadataOtherThanDebugLoc(TheMDs);
708 for (const auto &MD : TheMDs) {
709 if (WL.empty() || WLS.count(MD.first))
710 setMetadata(MD.first, MD.second);
711 }
712 if (WL.empty() || WLS.count(LLVMContext::MD_dbg))
713 setDebugLoc(SrcInst.getDebugLoc());
714 }
715
clone() const716 Instruction *Instruction::clone() const {
717 Instruction *New = nullptr;
718 switch (getOpcode()) {
719 default:
720 llvm_unreachable("Unhandled Opcode.");
721 #define HANDLE_INST(num, opc, clas) \
722 case Instruction::opc: \
723 New = cast<clas>(this)->cloneImpl(); \
724 break;
725 #include "llvm/IR/Instruction.def"
726 #undef HANDLE_INST
727 }
728
729 New->SubclassOptionalData = SubclassOptionalData;
730 New->copyMetadata(*this);
731 return New;
732 }
733
updateProfWeight(uint64_t S,uint64_t T)734 void Instruction::updateProfWeight(uint64_t S, uint64_t T) {
735 auto *ProfileData = getMetadata(LLVMContext::MD_prof);
736 if (ProfileData == nullptr)
737 return;
738
739 auto *ProfDataName = dyn_cast<MDString>(ProfileData->getOperand(0));
740 if (!ProfDataName || (!ProfDataName->getString().equals("branch_weights") &&
741 !ProfDataName->getString().equals("VP")))
742 return;
743
744 MDBuilder MDB(getContext());
745 SmallVector<Metadata *, 3> Vals;
746 Vals.push_back(ProfileData->getOperand(0));
747 APInt APS(128, S), APT(128, T);
748 if (ProfDataName->getString().equals("branch_weights"))
749 for (unsigned i = 1; i < ProfileData->getNumOperands(); i++) {
750 // Using APInt::div may be expensive, but most cases should fit 64 bits.
751 APInt Val(128,
752 mdconst::dyn_extract<ConstantInt>(ProfileData->getOperand(i))
753 ->getValue()
754 .getZExtValue());
755 Val *= APS;
756 Vals.push_back(MDB.createConstant(
757 ConstantInt::get(Type::getInt64Ty(getContext()),
758 Val.udiv(APT).getLimitedValue())));
759 }
760 else if (ProfDataName->getString().equals("VP"))
761 for (unsigned i = 1; i < ProfileData->getNumOperands(); i += 2) {
762 // The first value is the key of the value profile, which will not change.
763 Vals.push_back(ProfileData->getOperand(i));
764 // Using APInt::div may be expensive, but most cases should fit 64 bits.
765 APInt Val(128,
766 mdconst::dyn_extract<ConstantInt>(ProfileData->getOperand(i + 1))
767 ->getValue()
768 .getZExtValue());
769 Val *= APS;
770 Vals.push_back(MDB.createConstant(
771 ConstantInt::get(Type::getInt64Ty(getContext()),
772 Val.udiv(APT).getLimitedValue())));
773 }
774 setMetadata(LLVMContext::MD_prof, MDNode::get(getContext(), Vals));
775 }
776
setProfWeight(uint64_t W)777 void Instruction::setProfWeight(uint64_t W) {
778 assert((isa<CallInst>(this) || isa<InvokeInst>(this)) &&
779 "Can only set weights for call and invoke instrucitons");
780 SmallVector<uint32_t, 1> Weights;
781 Weights.push_back(W);
782 MDBuilder MDB(getContext());
783 setMetadata(LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
784 }
785