clang  10.0.0svn
CGStmt.cpp
Go to the documentation of this file.
1 //===--- CGStmt.cpp - Emit LLVM Code from Statements ----------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This contains code to emit Stmt nodes as LLVM code.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "CodeGenFunction.h"
14 #include "CGDebugInfo.h"
15 #include "CodeGenModule.h"
16 #include "TargetInfo.h"
17 #include "clang/AST/StmtVisitor.h"
18 #include "clang/Basic/Builtins.h"
20 #include "clang/Basic/TargetInfo.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/IR/InlineAsm.h"
24 #include "llvm/IR/Intrinsics.h"
25 #include "llvm/IR/MDBuilder.h"
26 
27 using namespace clang;
28 using namespace CodeGen;
29 
30 //===----------------------------------------------------------------------===//
31 // Statement Emission
32 //===----------------------------------------------------------------------===//
33 
35  if (CGDebugInfo *DI = getDebugInfo()) {
36  SourceLocation Loc;
37  Loc = S->getBeginLoc();
38  DI->EmitLocation(Builder, Loc);
39 
40  LastStopPoint = Loc;
41  }
42 }
43 
45  assert(S && "Null statement?");
46  PGO.setCurrentStmt(S);
47 
48  // These statements have their own debug info handling.
49  if (EmitSimpleStmt(S))
50  return;
51 
52  // Check if we are generating unreachable code.
53  if (!HaveInsertPoint()) {
54  // If so, and the statement doesn't contain a label, then we do not need to
55  // generate actual code. This is safe because (1) the current point is
56  // unreachable, so we don't need to execute the code, and (2) we've already
57  // handled the statements which update internal data structures (like the
58  // local variable map) which could be used by subsequent statements.
59  if (!ContainsLabel(S)) {
60  // Verify that any decl statements were handled as simple, they may be in
61  // scope of subsequent reachable statements.
62  assert(!isa<DeclStmt>(*S) && "Unexpected DeclStmt!");
63  return;
64  }
65 
66  // Otherwise, make a new block to hold the code.
68  }
69 
70  // Generate a stoppoint if we are emitting debug info.
71  EmitStopPoint(S);
72 
73  // Ignore all OpenMP directives except for simd if OpenMP with Simd is
74  // enabled.
75  if (getLangOpts().OpenMP && getLangOpts().OpenMPSimd) {
76  if (const auto *D = dyn_cast<OMPExecutableDirective>(S)) {
78  return;
79  }
80  }
81 
82  switch (S->getStmtClass()) {
83  case Stmt::NoStmtClass:
84  case Stmt::CXXCatchStmtClass:
85  case Stmt::SEHExceptStmtClass:
86  case Stmt::SEHFinallyStmtClass:
87  case Stmt::MSDependentExistsStmtClass:
88  llvm_unreachable("invalid statement class to emit generically");
89  case Stmt::NullStmtClass:
90  case Stmt::CompoundStmtClass:
91  case Stmt::DeclStmtClass:
92  case Stmt::LabelStmtClass:
93  case Stmt::AttributedStmtClass:
94  case Stmt::GotoStmtClass:
95  case Stmt::BreakStmtClass:
96  case Stmt::ContinueStmtClass:
97  case Stmt::DefaultStmtClass:
98  case Stmt::CaseStmtClass:
99  case Stmt::SEHLeaveStmtClass:
100  llvm_unreachable("should have emitted these statements as simple");
101 
102 #define STMT(Type, Base)
103 #define ABSTRACT_STMT(Op)
104 #define EXPR(Type, Base) \
105  case Stmt::Type##Class:
106 #include "clang/AST/StmtNodes.inc"
107  {
108  // Remember the block we came in on.
109  llvm::BasicBlock *incoming = Builder.GetInsertBlock();
110  assert(incoming && "expression emission must have an insertion point");
111 
112  EmitIgnoredExpr(cast<Expr>(S));
113 
114  llvm::BasicBlock *outgoing = Builder.GetInsertBlock();
115  assert(outgoing && "expression emission cleared block!");
116 
117  // The expression emitters assume (reasonably!) that the insertion
118  // point is always set. To maintain that, the call-emission code
119  // for noreturn functions has to enter a new block with no
120  // predecessors. We want to kill that block and mark the current
121  // insertion point unreachable in the common case of a call like
122  // "exit();". Since expression emission doesn't otherwise create
123  // blocks with no predecessors, we can just test for that.
124  // However, we must be careful not to do this to our incoming
125  // block, because *statement* emission does sometimes create
126  // reachable blocks which will have no predecessors until later in
127  // the function. This occurs with, e.g., labels that are not
128  // reachable by fallthrough.
129  if (incoming != outgoing && outgoing->use_empty()) {
130  outgoing->eraseFromParent();
131  Builder.ClearInsertionPoint();
132  }
133  break;
134  }
135 
136  case Stmt::IndirectGotoStmtClass:
137  EmitIndirectGotoStmt(cast<IndirectGotoStmt>(*S)); break;
138 
139  case Stmt::IfStmtClass: EmitIfStmt(cast<IfStmt>(*S)); break;
140  case Stmt::WhileStmtClass: EmitWhileStmt(cast<WhileStmt>(*S), Attrs); break;
141  case Stmt::DoStmtClass: EmitDoStmt(cast<DoStmt>(*S), Attrs); break;
142  case Stmt::ForStmtClass: EmitForStmt(cast<ForStmt>(*S), Attrs); break;
143 
144  case Stmt::ReturnStmtClass: EmitReturnStmt(cast<ReturnStmt>(*S)); break;
145 
146  case Stmt::SwitchStmtClass: EmitSwitchStmt(cast<SwitchStmt>(*S)); break;
147  case Stmt::GCCAsmStmtClass: // Intentional fall-through.
148  case Stmt::MSAsmStmtClass: EmitAsmStmt(cast<AsmStmt>(*S)); break;
149  case Stmt::CoroutineBodyStmtClass:
150  EmitCoroutineBody(cast<CoroutineBodyStmt>(*S));
151  break;
152  case Stmt::CoreturnStmtClass:
153  EmitCoreturnStmt(cast<CoreturnStmt>(*S));
154  break;
155  case Stmt::CapturedStmtClass: {
156  const CapturedStmt *CS = cast<CapturedStmt>(S);
158  }
159  break;
160  case Stmt::ObjCAtTryStmtClass:
161  EmitObjCAtTryStmt(cast<ObjCAtTryStmt>(*S));
162  break;
163  case Stmt::ObjCAtCatchStmtClass:
164  llvm_unreachable(
165  "@catch statements should be handled by EmitObjCAtTryStmt");
166  case Stmt::ObjCAtFinallyStmtClass:
167  llvm_unreachable(
168  "@finally statements should be handled by EmitObjCAtTryStmt");
169  case Stmt::ObjCAtThrowStmtClass:
170  EmitObjCAtThrowStmt(cast<ObjCAtThrowStmt>(*S));
171  break;
172  case Stmt::ObjCAtSynchronizedStmtClass:
173  EmitObjCAtSynchronizedStmt(cast<ObjCAtSynchronizedStmt>(*S));
174  break;
175  case Stmt::ObjCForCollectionStmtClass:
176  EmitObjCForCollectionStmt(cast<ObjCForCollectionStmt>(*S));
177  break;
178  case Stmt::ObjCAutoreleasePoolStmtClass:
179  EmitObjCAutoreleasePoolStmt(cast<ObjCAutoreleasePoolStmt>(*S));
180  break;
181 
182  case Stmt::CXXTryStmtClass:
183  EmitCXXTryStmt(cast<CXXTryStmt>(*S));
184  break;
185  case Stmt::CXXForRangeStmtClass:
186  EmitCXXForRangeStmt(cast<CXXForRangeStmt>(*S), Attrs);
187  break;
188  case Stmt::SEHTryStmtClass:
189  EmitSEHTryStmt(cast<SEHTryStmt>(*S));
190  break;
191  case Stmt::OMPParallelDirectiveClass:
192  EmitOMPParallelDirective(cast<OMPParallelDirective>(*S));
193  break;
194  case Stmt::OMPSimdDirectiveClass:
195  EmitOMPSimdDirective(cast<OMPSimdDirective>(*S));
196  break;
197  case Stmt::OMPForDirectiveClass:
198  EmitOMPForDirective(cast<OMPForDirective>(*S));
199  break;
200  case Stmt::OMPForSimdDirectiveClass:
201  EmitOMPForSimdDirective(cast<OMPForSimdDirective>(*S));
202  break;
203  case Stmt::OMPSectionsDirectiveClass:
204  EmitOMPSectionsDirective(cast<OMPSectionsDirective>(*S));
205  break;
206  case Stmt::OMPSectionDirectiveClass:
207  EmitOMPSectionDirective(cast<OMPSectionDirective>(*S));
208  break;
209  case Stmt::OMPSingleDirectiveClass:
210  EmitOMPSingleDirective(cast<OMPSingleDirective>(*S));
211  break;
212  case Stmt::OMPMasterDirectiveClass:
213  EmitOMPMasterDirective(cast<OMPMasterDirective>(*S));
214  break;
215  case Stmt::OMPCriticalDirectiveClass:
216  EmitOMPCriticalDirective(cast<OMPCriticalDirective>(*S));
217  break;
218  case Stmt::OMPParallelForDirectiveClass:
219  EmitOMPParallelForDirective(cast<OMPParallelForDirective>(*S));
220  break;
221  case Stmt::OMPParallelForSimdDirectiveClass:
222  EmitOMPParallelForSimdDirective(cast<OMPParallelForSimdDirective>(*S));
223  break;
224  case Stmt::OMPParallelSectionsDirectiveClass:
225  EmitOMPParallelSectionsDirective(cast<OMPParallelSectionsDirective>(*S));
226  break;
227  case Stmt::OMPTaskDirectiveClass:
228  EmitOMPTaskDirective(cast<OMPTaskDirective>(*S));
229  break;
230  case Stmt::OMPTaskyieldDirectiveClass:
231  EmitOMPTaskyieldDirective(cast<OMPTaskyieldDirective>(*S));
232  break;
233  case Stmt::OMPBarrierDirectiveClass:
234  EmitOMPBarrierDirective(cast<OMPBarrierDirective>(*S));
235  break;
236  case Stmt::OMPTaskwaitDirectiveClass:
237  EmitOMPTaskwaitDirective(cast<OMPTaskwaitDirective>(*S));
238  break;
239  case Stmt::OMPTaskgroupDirectiveClass:
240  EmitOMPTaskgroupDirective(cast<OMPTaskgroupDirective>(*S));
241  break;
242  case Stmt::OMPFlushDirectiveClass:
243  EmitOMPFlushDirective(cast<OMPFlushDirective>(*S));
244  break;
245  case Stmt::OMPOrderedDirectiveClass:
246  EmitOMPOrderedDirective(cast<OMPOrderedDirective>(*S));
247  break;
248  case Stmt::OMPAtomicDirectiveClass:
249  EmitOMPAtomicDirective(cast<OMPAtomicDirective>(*S));
250  break;
251  case Stmt::OMPTargetDirectiveClass:
252  EmitOMPTargetDirective(cast<OMPTargetDirective>(*S));
253  break;
254  case Stmt::OMPTeamsDirectiveClass:
255  EmitOMPTeamsDirective(cast<OMPTeamsDirective>(*S));
256  break;
257  case Stmt::OMPCancellationPointDirectiveClass:
258  EmitOMPCancellationPointDirective(cast<OMPCancellationPointDirective>(*S));
259  break;
260  case Stmt::OMPCancelDirectiveClass:
261  EmitOMPCancelDirective(cast<OMPCancelDirective>(*S));
262  break;
263  case Stmt::OMPTargetDataDirectiveClass:
264  EmitOMPTargetDataDirective(cast<OMPTargetDataDirective>(*S));
265  break;
266  case Stmt::OMPTargetEnterDataDirectiveClass:
267  EmitOMPTargetEnterDataDirective(cast<OMPTargetEnterDataDirective>(*S));
268  break;
269  case Stmt::OMPTargetExitDataDirectiveClass:
270  EmitOMPTargetExitDataDirective(cast<OMPTargetExitDataDirective>(*S));
271  break;
272  case Stmt::OMPTargetParallelDirectiveClass:
273  EmitOMPTargetParallelDirective(cast<OMPTargetParallelDirective>(*S));
274  break;
275  case Stmt::OMPTargetParallelForDirectiveClass:
276  EmitOMPTargetParallelForDirective(cast<OMPTargetParallelForDirective>(*S));
277  break;
278  case Stmt::OMPTaskLoopDirectiveClass:
279  EmitOMPTaskLoopDirective(cast<OMPTaskLoopDirective>(*S));
280  break;
281  case Stmt::OMPTaskLoopSimdDirectiveClass:
282  EmitOMPTaskLoopSimdDirective(cast<OMPTaskLoopSimdDirective>(*S));
283  break;
284  case Stmt::OMPMasterTaskLoopDirectiveClass:
285  EmitOMPMasterTaskLoopDirective(cast<OMPMasterTaskLoopDirective>(*S));
286  break;
287  case Stmt::OMPDistributeDirectiveClass:
288  EmitOMPDistributeDirective(cast<OMPDistributeDirective>(*S));
289  break;
290  case Stmt::OMPTargetUpdateDirectiveClass:
291  EmitOMPTargetUpdateDirective(cast<OMPTargetUpdateDirective>(*S));
292  break;
293  case Stmt::OMPDistributeParallelForDirectiveClass:
295  cast<OMPDistributeParallelForDirective>(*S));
296  break;
297  case Stmt::OMPDistributeParallelForSimdDirectiveClass:
299  cast<OMPDistributeParallelForSimdDirective>(*S));
300  break;
301  case Stmt::OMPDistributeSimdDirectiveClass:
302  EmitOMPDistributeSimdDirective(cast<OMPDistributeSimdDirective>(*S));
303  break;
304  case Stmt::OMPTargetParallelForSimdDirectiveClass:
306  cast<OMPTargetParallelForSimdDirective>(*S));
307  break;
308  case Stmt::OMPTargetSimdDirectiveClass:
309  EmitOMPTargetSimdDirective(cast<OMPTargetSimdDirective>(*S));
310  break;
311  case Stmt::OMPTeamsDistributeDirectiveClass:
312  EmitOMPTeamsDistributeDirective(cast<OMPTeamsDistributeDirective>(*S));
313  break;
314  case Stmt::OMPTeamsDistributeSimdDirectiveClass:
316  cast<OMPTeamsDistributeSimdDirective>(*S));
317  break;
318  case Stmt::OMPTeamsDistributeParallelForSimdDirectiveClass:
320  cast<OMPTeamsDistributeParallelForSimdDirective>(*S));
321  break;
322  case Stmt::OMPTeamsDistributeParallelForDirectiveClass:
324  cast<OMPTeamsDistributeParallelForDirective>(*S));
325  break;
326  case Stmt::OMPTargetTeamsDirectiveClass:
327  EmitOMPTargetTeamsDirective(cast<OMPTargetTeamsDirective>(*S));
328  break;
329  case Stmt::OMPTargetTeamsDistributeDirectiveClass:
331  cast<OMPTargetTeamsDistributeDirective>(*S));
332  break;
333  case Stmt::OMPTargetTeamsDistributeParallelForDirectiveClass:
335  cast<OMPTargetTeamsDistributeParallelForDirective>(*S));
336  break;
337  case Stmt::OMPTargetTeamsDistributeParallelForSimdDirectiveClass:
339  cast<OMPTargetTeamsDistributeParallelForSimdDirective>(*S));
340  break;
341  case Stmt::OMPTargetTeamsDistributeSimdDirectiveClass:
343  cast<OMPTargetTeamsDistributeSimdDirective>(*S));
344  break;
345  }
346 }
347 
349  switch (S->getStmtClass()) {
350  default: return false;
351  case Stmt::NullStmtClass: break;
352  case Stmt::CompoundStmtClass: EmitCompoundStmt(cast<CompoundStmt>(*S)); break;
353  case Stmt::DeclStmtClass: EmitDeclStmt(cast<DeclStmt>(*S)); break;
354  case Stmt::LabelStmtClass: EmitLabelStmt(cast<LabelStmt>(*S)); break;
355  case Stmt::AttributedStmtClass:
356  EmitAttributedStmt(cast<AttributedStmt>(*S)); break;
357  case Stmt::GotoStmtClass: EmitGotoStmt(cast<GotoStmt>(*S)); break;
358  case Stmt::BreakStmtClass: EmitBreakStmt(cast<BreakStmt>(*S)); break;
359  case Stmt::ContinueStmtClass: EmitContinueStmt(cast<ContinueStmt>(*S)); break;
360  case Stmt::DefaultStmtClass: EmitDefaultStmt(cast<DefaultStmt>(*S)); break;
361  case Stmt::CaseStmtClass: EmitCaseStmt(cast<CaseStmt>(*S)); break;
362  case Stmt::SEHLeaveStmtClass: EmitSEHLeaveStmt(cast<SEHLeaveStmt>(*S)); break;
363  }
364 
365  return true;
366 }
367 
368 /// EmitCompoundStmt - Emit a compound statement {..} node. If GetLast is true,
369 /// this captures the expression result of the last sub-statement and returns it
370 /// (for use by the statement expression extension).
372  AggValueSlot AggSlot) {
373  PrettyStackTraceLoc CrashInfo(getContext().getSourceManager(),S.getLBracLoc(),
374  "LLVM IR generation of compound statement ('{}')");
375 
376  // Keep track of the current cleanup stack depth, including debug scopes.
377  LexicalScope Scope(*this, S.getSourceRange());
378 
379  return EmitCompoundStmtWithoutScope(S, GetLast, AggSlot);
380 }
381 
382 Address
384  bool GetLast,
385  AggValueSlot AggSlot) {
386 
387  const Stmt *ExprResult = S.getStmtExprResult();
388  assert((!GetLast || (GetLast && ExprResult)) &&
389  "If GetLast is true then the CompoundStmt must have a StmtExprResult");
390 
391  Address RetAlloca = Address::invalid();
392 
393  for (auto *CurStmt : S.body()) {
394  if (GetLast && ExprResult == CurStmt) {
395  // We have to special case labels here. They are statements, but when put
396  // at the end of a statement expression, they yield the value of their
397  // subexpression. Handle this by walking through all labels we encounter,
398  // emitting them before we evaluate the subexpr.
399  // Similar issues arise for attributed statements.
400  while (!isa<Expr>(ExprResult)) {
401  if (const auto *LS = dyn_cast<LabelStmt>(ExprResult)) {
402  EmitLabel(LS->getDecl());
403  ExprResult = LS->getSubStmt();
404  } else if (const auto *AS = dyn_cast<AttributedStmt>(ExprResult)) {
405  // FIXME: Update this if we ever have attributes that affect the
406  // semantics of an expression.
407  ExprResult = AS->getSubStmt();
408  } else {
409  llvm_unreachable("unknown value statement");
410  }
411  }
412 
414 
415  const Expr *E = cast<Expr>(ExprResult);
416  QualType ExprTy = E->getType();
417  if (hasAggregateEvaluationKind(ExprTy)) {
418  EmitAggExpr(E, AggSlot);
419  } else {
420  // We can't return an RValue here because there might be cleanups at
421  // the end of the StmtExpr. Because of that, we have to emit the result
422  // here into a temporary alloca.
423  RetAlloca = CreateMemTemp(ExprTy);
424  EmitAnyExprToMem(E, RetAlloca, Qualifiers(),
425  /*IsInit*/ false);
426  }
427  } else {
428  EmitStmt(CurStmt);
429  }
430  }
431 
432  return RetAlloca;
433 }
434 
435 void CodeGenFunction::SimplifyForwardingBlocks(llvm::BasicBlock *BB) {
436  llvm::BranchInst *BI = dyn_cast<llvm::BranchInst>(BB->getTerminator());
437 
438  // If there is a cleanup stack, then we it isn't worth trying to
439  // simplify this block (we would need to remove it from the scope map
440  // and cleanup entry).
441  if (!EHStack.empty())
442  return;
443 
444  // Can only simplify direct branches.
445  if (!BI || !BI->isUnconditional())
446  return;
447 
448  // Can only simplify empty blocks.
449  if (BI->getIterator() != BB->begin())
450  return;
451 
452  BB->replaceAllUsesWith(BI->getSuccessor(0));
453  BI->eraseFromParent();
454  BB->eraseFromParent();
455 }
456 
457 void CodeGenFunction::EmitBlock(llvm::BasicBlock *BB, bool IsFinished) {
458  llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
459 
460  // Fall out of the current block (if necessary).
461  EmitBranch(BB);
462 
463  if (IsFinished && BB->use_empty()) {
464  delete BB;
465  return;
466  }
467 
468  // Place the block after the current block, if possible, or else at
469  // the end of the function.
470  if (CurBB && CurBB->getParent())
471  CurFn->getBasicBlockList().insertAfter(CurBB->getIterator(), BB);
472  else
473  CurFn->getBasicBlockList().push_back(BB);
474  Builder.SetInsertPoint(BB);
475 }
476 
477 void CodeGenFunction::EmitBranch(llvm::BasicBlock *Target) {
478  // Emit a branch from the current block to the target one if this
479  // was a real block. If this was just a fall-through block after a
480  // terminator, don't emit it.
481  llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
482 
483  if (!CurBB || CurBB->getTerminator()) {
484  // If there is no insert point or the previous block is already
485  // terminated, don't touch it.
486  } else {
487  // Otherwise, create a fall-through branch.
488  Builder.CreateBr(Target);
489  }
490 
491  Builder.ClearInsertionPoint();
492 }
493 
494 void CodeGenFunction::EmitBlockAfterUses(llvm::BasicBlock *block) {
495  bool inserted = false;
496  for (llvm::User *u : block->users()) {
497  if (llvm::Instruction *insn = dyn_cast<llvm::Instruction>(u)) {
498  CurFn->getBasicBlockList().insertAfter(insn->getParent()->getIterator(),
499  block);
500  inserted = true;
501  break;
502  }
503  }
504 
505  if (!inserted)
506  CurFn->getBasicBlockList().push_back(block);
507 
508  Builder.SetInsertPoint(block);
509 }
510 
513  JumpDest &Dest = LabelMap[D];
514  if (Dest.isValid()) return Dest;
515 
516  // Create, but don't insert, the new block.
517  Dest = JumpDest(createBasicBlock(D->getName()),
520  return Dest;
521 }
522 
524  // Add this label to the current lexical scope if we're within any
525  // normal cleanups. Jumps "in" to this label --- when permitted by
526  // the language --- may need to be routed around such cleanups.
527  if (EHStack.hasNormalCleanups() && CurLexicalScope)
528  CurLexicalScope->addLabel(D);
529 
530  JumpDest &Dest = LabelMap[D];
531 
532  // If we didn't need a forward reference to this label, just go
533  // ahead and create a destination at the current scope.
534  if (!Dest.isValid()) {
535  Dest = getJumpDestInCurrentScope(D->getName());
536 
537  // Otherwise, we need to give this label a target depth and remove
538  // it from the branch-fixups list.
539  } else {
540  assert(!Dest.getScopeDepth().isValid() && "already emitted label!");
543  }
544 
545  EmitBlock(Dest.getBlock());
546 
547  // Emit debug info for labels.
548  if (CGDebugInfo *DI = getDebugInfo()) {
549  if (CGM.getCodeGenOpts().getDebugInfo() >=
551  DI->setLocation(D->getLocation());
552  DI->EmitLabel(D, Builder);
553  }
554  }
555 
557 }
558 
559 /// Change the cleanup scope of the labels in this lexical scope to
560 /// match the scope of the enclosing context.
562  assert(!Labels.empty());
563  EHScopeStack::stable_iterator innermostScope
564  = CGF.EHStack.getInnermostNormalCleanup();
565 
566  // Change the scope depth of all the labels.
568  i = Labels.begin(), e = Labels.end(); i != e; ++i) {
569  assert(CGF.LabelMap.count(*i));
570  JumpDest &dest = CGF.LabelMap.find(*i)->second;
571  assert(dest.getScopeDepth().isValid());
572  assert(innermostScope.encloses(dest.getScopeDepth()));
573  dest.setScopeDepth(innermostScope);
574  }
575 
576  // Reparent the labels if the new scope also has cleanups.
577  if (innermostScope != EHScopeStack::stable_end() && ParentScope) {
578  ParentScope->Labels.append(Labels.begin(), Labels.end());
579  }
580 }
581 
582 
584  EmitLabel(S.getDecl());
585  EmitStmt(S.getSubStmt());
586 }
587 
589  EmitStmt(S.getSubStmt(), S.getAttrs());
590 }
591 
593  // If this code is reachable then emit a stop point (if generating
594  // debug info). We have to do this ourselves because we are on the
595  // "simple" statement path.
596  if (HaveInsertPoint())
597  EmitStopPoint(&S);
598 
600 }
601 
602 
604  if (const LabelDecl *Target = S.getConstantTarget()) {
606  return;
607  }
608 
609  // Ensure that we have an i8* for our PHI node.
611  Int8PtrTy, "addr");
612  llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
613 
614  // Get the basic block for the indirect goto.
615  llvm::BasicBlock *IndGotoBB = GetIndirectGotoBlock();
616 
617  // The first instruction in the block has to be the PHI for the switch dest,
618  // add an entry for this branch.
619  cast<llvm::PHINode>(IndGotoBB->begin())->addIncoming(V, CurBB);
620 
621  EmitBranch(IndGotoBB);
622 }
623 
625  // C99 6.8.4.1: The first substatement is executed if the expression compares
626  // unequal to 0. The condition must be a scalar type.
627  LexicalScope ConditionScope(*this, S.getCond()->getSourceRange());
628 
629  if (S.getInit())
630  EmitStmt(S.getInit());
631 
632  if (S.getConditionVariable())
634 
635  // If the condition constant folds and can be elided, try to avoid emitting
636  // the condition and the dead arm of the if/else.
637  bool CondConstant;
638  if (ConstantFoldsToSimpleInteger(S.getCond(), CondConstant,
639  S.isConstexpr())) {
640  // Figure out which block (then or else) is executed.
641  const Stmt *Executed = S.getThen();
642  const Stmt *Skipped = S.getElse();
643  if (!CondConstant) // Condition false?
644  std::swap(Executed, Skipped);
645 
646  // If the skipped block has no labels in it, just emit the executed block.
647  // This avoids emitting dead code and simplifies the CFG substantially.
648  if (S.isConstexpr() || !ContainsLabel(Skipped)) {
649  if (CondConstant)
651  if (Executed) {
652  RunCleanupsScope ExecutedScope(*this);
653  EmitStmt(Executed);
654  }
655  return;
656  }
657  }
658 
659  // Otherwise, the condition did not fold, or we couldn't elide it. Just emit
660  // the conditional branch.
661  llvm::BasicBlock *ThenBlock = createBasicBlock("if.then");
662  llvm::BasicBlock *ContBlock = createBasicBlock("if.end");
663  llvm::BasicBlock *ElseBlock = ContBlock;
664  if (S.getElse())
665  ElseBlock = createBasicBlock("if.else");
666 
667  EmitBranchOnBoolExpr(S.getCond(), ThenBlock, ElseBlock,
668  getProfileCount(S.getThen()));
669 
670  // Emit the 'then' code.
671  EmitBlock(ThenBlock);
673  {
674  RunCleanupsScope ThenScope(*this);
675  EmitStmt(S.getThen());
676  }
677  EmitBranch(ContBlock);
678 
679  // Emit the 'else' code if present.
680  if (const Stmt *Else = S.getElse()) {
681  {
682  // There is no need to emit line number for an unconditional branch.
683  auto NL = ApplyDebugLocation::CreateEmpty(*this);
684  EmitBlock(ElseBlock);
685  }
686  {
687  RunCleanupsScope ElseScope(*this);
688  EmitStmt(Else);
689  }
690  {
691  // There is no need to emit line number for an unconditional branch.
692  auto NL = ApplyDebugLocation::CreateEmpty(*this);
693  EmitBranch(ContBlock);
694  }
695  }
696 
697  // Emit the continuation block for code after the if.
698  EmitBlock(ContBlock, true);
699 }
700 
702  ArrayRef<const Attr *> WhileAttrs) {
703  // Emit the header for the loop, which will also become
704  // the continue target.
705  JumpDest LoopHeader = getJumpDestInCurrentScope("while.cond");
706  EmitBlock(LoopHeader.getBlock());
707 
708  const SourceRange &R = S.getSourceRange();
709  LoopStack.push(LoopHeader.getBlock(), CGM.getContext(), WhileAttrs,
710  SourceLocToDebugLoc(R.getBegin()),
711  SourceLocToDebugLoc(R.getEnd()));
712 
713  // Create an exit block for when the condition fails, which will
714  // also become the break target.
716 
717  // Store the blocks to use for break and continue.
718  BreakContinueStack.push_back(BreakContinue(LoopExit, LoopHeader));
719 
720  // C++ [stmt.while]p2:
721  // When the condition of a while statement is a declaration, the
722  // scope of the variable that is declared extends from its point
723  // of declaration (3.3.2) to the end of the while statement.
724  // [...]
725  // The object created in a condition is destroyed and created
726  // with each iteration of the loop.
727  RunCleanupsScope ConditionScope(*this);
728 
729  if (S.getConditionVariable())
731 
732  // Evaluate the conditional in the while header. C99 6.8.5.1: The
733  // evaluation of the controlling expression takes place before each
734  // execution of the loop body.
735  llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond());
736 
737  // while(1) is common, avoid extra exit blocks. Be sure
738  // to correctly handle break/continue though.
739  bool EmitBoolCondBranch = true;
740  if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal))
741  if (C->isOne())
742  EmitBoolCondBranch = false;
743 
744  // As long as the condition is true, go to the loop body.
745  llvm::BasicBlock *LoopBody = createBasicBlock("while.body");
746  if (EmitBoolCondBranch) {
747  llvm::BasicBlock *ExitBlock = LoopExit.getBlock();
748  if (ConditionScope.requiresCleanups())
749  ExitBlock = createBasicBlock("while.exit");
750  Builder.CreateCondBr(
751  BoolCondVal, LoopBody, ExitBlock,
752  createProfileWeightsForLoop(S.getCond(), getProfileCount(S.getBody())));
753 
754  if (ExitBlock != LoopExit.getBlock()) {
755  EmitBlock(ExitBlock);
756  EmitBranchThroughCleanup(LoopExit);
757  }
758  }
759 
760  // Emit the loop body. We have to emit this in a cleanup scope
761  // because it might be a singleton DeclStmt.
762  {
763  RunCleanupsScope BodyScope(*this);
764  EmitBlock(LoopBody);
766  EmitStmt(S.getBody());
767  }
768 
769  BreakContinueStack.pop_back();
770 
771  // Immediately force cleanup.
772  ConditionScope.ForceCleanup();
773 
774  EmitStopPoint(&S);
775  // Branch to the loop header again.
776  EmitBranch(LoopHeader.getBlock());
777 
778  LoopStack.pop();
779 
780  // Emit the exit block.
781  EmitBlock(LoopExit.getBlock(), true);
782 
783  // The LoopHeader typically is just a branch if we skipped emitting
784  // a branch, try to erase it.
785  if (!EmitBoolCondBranch)
786  SimplifyForwardingBlocks(LoopHeader.getBlock());
787 }
788 
790  ArrayRef<const Attr *> DoAttrs) {
792  JumpDest LoopCond = getJumpDestInCurrentScope("do.cond");
793 
794  uint64_t ParentCount = getCurrentProfileCount();
795 
796  // Store the blocks to use for break and continue.
797  BreakContinueStack.push_back(BreakContinue(LoopExit, LoopCond));
798 
799  // Emit the body of the loop.
800  llvm::BasicBlock *LoopBody = createBasicBlock("do.body");
801 
802  EmitBlockWithFallThrough(LoopBody, &S);
803  {
804  RunCleanupsScope BodyScope(*this);
805  EmitStmt(S.getBody());
806  }
807 
808  EmitBlock(LoopCond.getBlock());
809 
810  const SourceRange &R = S.getSourceRange();
811  LoopStack.push(LoopBody, CGM.getContext(), DoAttrs,
812  SourceLocToDebugLoc(R.getBegin()),
813  SourceLocToDebugLoc(R.getEnd()));
814 
815  // C99 6.8.5.2: "The evaluation of the controlling expression takes place
816  // after each execution of the loop body."
817 
818  // Evaluate the conditional in the while header.
819  // C99 6.8.5p2/p4: The first substatement is executed if the expression
820  // compares unequal to 0. The condition must be a scalar type.
821  llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond());
822 
823  BreakContinueStack.pop_back();
824 
825  // "do {} while (0)" is common in macros, avoid extra blocks. Be sure
826  // to correctly handle break/continue though.
827  bool EmitBoolCondBranch = true;
828  if (llvm::ConstantInt *C = dyn_cast<llvm::ConstantInt>(BoolCondVal))
829  if (C->isZero())
830  EmitBoolCondBranch = false;
831 
832  // As long as the condition is true, iterate the loop.
833  if (EmitBoolCondBranch) {
834  uint64_t BackedgeCount = getProfileCount(S.getBody()) - ParentCount;
835  Builder.CreateCondBr(
836  BoolCondVal, LoopBody, LoopExit.getBlock(),
837  createProfileWeightsForLoop(S.getCond(), BackedgeCount));
838  }
839 
840  LoopStack.pop();
841 
842  // Emit the exit block.
843  EmitBlock(LoopExit.getBlock());
844 
845  // The DoCond block typically is just a branch if we skipped
846  // emitting a branch, try to erase it.
847  if (!EmitBoolCondBranch)
849 }
850 
852  ArrayRef<const Attr *> ForAttrs) {
854 
855  LexicalScope ForScope(*this, S.getSourceRange());
856 
857  // Evaluate the first part before the loop.
858  if (S.getInit())
859  EmitStmt(S.getInit());
860 
861  // Start the loop with a block that tests the condition.
862  // If there's an increment, the continue scope will be overwritten
863  // later.
864  JumpDest Continue = getJumpDestInCurrentScope("for.cond");
865  llvm::BasicBlock *CondBlock = Continue.getBlock();
866  EmitBlock(CondBlock);
867 
868  const SourceRange &R = S.getSourceRange();
869  LoopStack.push(CondBlock, CGM.getContext(), ForAttrs,
872 
873  // If the for loop doesn't have an increment we can just use the
874  // condition as the continue block. Otherwise we'll need to create
875  // a block for it (in the current scope, i.e. in the scope of the
876  // condition), and that we will become our continue block.
877  if (S.getInc())
878  Continue = getJumpDestInCurrentScope("for.inc");
879 
880  // Store the blocks to use for break and continue.
881  BreakContinueStack.push_back(BreakContinue(LoopExit, Continue));
882 
883  // Create a cleanup scope for the condition variable cleanups.
884  LexicalScope ConditionScope(*this, S.getSourceRange());
885 
886  if (S.getCond()) {
887  // If the for statement has a condition scope, emit the local variable
888  // declaration.
889  if (S.getConditionVariable()) {
891  }
892 
893  llvm::BasicBlock *ExitBlock = LoopExit.getBlock();
894  // If there are any cleanups between here and the loop-exit scope,
895  // create a block to stage a loop exit along.
896  if (ForScope.requiresCleanups())
897  ExitBlock = createBasicBlock("for.cond.cleanup");
898 
899  // As long as the condition is true, iterate the loop.
900  llvm::BasicBlock *ForBody = createBasicBlock("for.body");
901 
902  // C99 6.8.5p2/p4: The first substatement is executed if the expression
903  // compares unequal to 0. The condition must be a scalar type.
904  llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond());
905  Builder.CreateCondBr(
906  BoolCondVal, ForBody, ExitBlock,
907  createProfileWeightsForLoop(S.getCond(), getProfileCount(S.getBody())));
908 
909  if (ExitBlock != LoopExit.getBlock()) {
910  EmitBlock(ExitBlock);
911  EmitBranchThroughCleanup(LoopExit);
912  }
913 
914  EmitBlock(ForBody);
915  } else {
916  // Treat it as a non-zero constant. Don't even create a new block for the
917  // body, just fall into it.
918  }
920 
921  {
922  // Create a separate cleanup scope for the body, in case it is not
923  // a compound statement.
924  RunCleanupsScope BodyScope(*this);
925  EmitStmt(S.getBody());
926  }
927 
928  // If there is an increment, emit it next.
929  if (S.getInc()) {
930  EmitBlock(Continue.getBlock());
931  EmitStmt(S.getInc());
932  }
933 
934  BreakContinueStack.pop_back();
935 
936  ConditionScope.ForceCleanup();
937 
938  EmitStopPoint(&S);
939  EmitBranch(CondBlock);
940 
941  ForScope.ForceCleanup();
942 
943  LoopStack.pop();
944 
945  // Emit the fall-through block.
946  EmitBlock(LoopExit.getBlock(), true);
947 }
948 
949 void
951  ArrayRef<const Attr *> ForAttrs) {
953 
954  LexicalScope ForScope(*this, S.getSourceRange());
955 
956  // Evaluate the first pieces before the loop.
957  if (S.getInit())
958  EmitStmt(S.getInit());
959  EmitStmt(S.getRangeStmt());
960  EmitStmt(S.getBeginStmt());
961  EmitStmt(S.getEndStmt());
962 
963  // Start the loop with a block that tests the condition.
964  // If there's an increment, the continue scope will be overwritten
965  // later.
966  llvm::BasicBlock *CondBlock = createBasicBlock("for.cond");
967  EmitBlock(CondBlock);
968 
969  const SourceRange &R = S.getSourceRange();
970  LoopStack.push(CondBlock, CGM.getContext(), ForAttrs,
973 
974  // If there are any cleanups between here and the loop-exit scope,
975  // create a block to stage a loop exit along.
976  llvm::BasicBlock *ExitBlock = LoopExit.getBlock();
977  if (ForScope.requiresCleanups())
978  ExitBlock = createBasicBlock("for.cond.cleanup");
979 
980  // The loop body, consisting of the specified body and the loop variable.
981  llvm::BasicBlock *ForBody = createBasicBlock("for.body");
982 
983  // The body is executed if the expression, contextually converted
984  // to bool, is true.
985  llvm::Value *BoolCondVal = EvaluateExprAsBool(S.getCond());
986  Builder.CreateCondBr(
987  BoolCondVal, ForBody, ExitBlock,
988  createProfileWeightsForLoop(S.getCond(), getProfileCount(S.getBody())));
989 
990  if (ExitBlock != LoopExit.getBlock()) {
991  EmitBlock(ExitBlock);
992  EmitBranchThroughCleanup(LoopExit);
993  }
994 
995  EmitBlock(ForBody);
997 
998  // Create a block for the increment. In case of a 'continue', we jump there.
999  JumpDest Continue = getJumpDestInCurrentScope("for.inc");
1000 
1001  // Store the blocks to use for break and continue.
1002  BreakContinueStack.push_back(BreakContinue(LoopExit, Continue));
1003 
1004  {
1005  // Create a separate cleanup scope for the loop variable and body.
1006  LexicalScope BodyScope(*this, S.getSourceRange());
1007  EmitStmt(S.getLoopVarStmt());
1008  EmitStmt(S.getBody());
1009  }
1010 
1011  EmitStopPoint(&S);
1012  // If there is an increment, emit it next.
1013  EmitBlock(Continue.getBlock());
1014  EmitStmt(S.getInc());
1015 
1016  BreakContinueStack.pop_back();
1017 
1018  EmitBranch(CondBlock);
1019 
1020  ForScope.ForceCleanup();
1021 
1022  LoopStack.pop();
1023 
1024  // Emit the fall-through block.
1025  EmitBlock(LoopExit.getBlock(), true);
1026 }
1027 
1028 void CodeGenFunction::EmitReturnOfRValue(RValue RV, QualType Ty) {
1029  if (RV.isScalar()) {
1031  } else if (RV.isAggregate()) {
1032  LValue Dest = MakeAddrLValue(ReturnValue, Ty);
1033  LValue Src = MakeAddrLValue(RV.getAggregateAddress(), Ty);
1034  EmitAggregateCopy(Dest, Src, Ty, getOverlapForReturnValue());
1035  } else {
1037  /*init*/ true);
1038  }
1040 }
1041 
1042 /// EmitReturnStmt - Note that due to GCC extensions, this can have an operand
1043 /// if the function returns void, or may be missing one if the function returns
1044 /// non-void. Fun stuff :).
1046  if (requiresReturnValueCheck()) {
1047  llvm::Constant *SLoc = EmitCheckSourceLocation(S.getBeginLoc());
1048  auto *SLocPtr =
1049  new llvm::GlobalVariable(CGM.getModule(), SLoc->getType(), false,
1050  llvm::GlobalVariable::PrivateLinkage, SLoc);
1051  SLocPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
1053  assert(ReturnLocation.isValid() && "No valid return location");
1055  ReturnLocation);
1056  }
1057 
1058  // Returning from an outlined SEH helper is UB, and we already warn on it.
1059  if (IsOutlinedSEHHelper) {
1060  Builder.CreateUnreachable();
1061  Builder.ClearInsertionPoint();
1062  }
1063 
1064  // Emit the result value, even if unused, to evaluate the side effects.
1065  const Expr *RV = S.getRetValue();
1066 
1067  // Treat block literals in a return expression as if they appeared
1068  // in their own scope. This permits a small, easily-implemented
1069  // exception to our over-conservative rules about not jumping to
1070  // statements following block literals with non-trivial cleanups.
1071  RunCleanupsScope cleanupScope(*this);
1072  if (const FullExpr *fe = dyn_cast_or_null<FullExpr>(RV)) {
1073  enterFullExpression(fe);
1074  RV = fe->getSubExpr();
1075  }
1076 
1077  // FIXME: Clean this up by using an LValue for ReturnTemp,
1078  // EmitStoreThroughLValue, and EmitAnyExpr.
1079  if (getLangOpts().ElideConstructors &&
1081  // Apply the named return value optimization for this return statement,
1082  // which means doing nothing: the appropriate result has already been
1083  // constructed into the NRVO variable.
1084 
1085  // If there is an NRVO flag for this variable, set it to 1 into indicate
1086  // that the cleanup code should not destroy the variable.
1087  if (llvm::Value *NRVOFlag = NRVOFlags[S.getNRVOCandidate()])
1088  Builder.CreateFlagStore(Builder.getTrue(), NRVOFlag);
1089  } else if (!ReturnValue.isValid() || (RV && RV->getType()->isVoidType())) {
1090  // Make sure not to return anything, but evaluate the expression
1091  // for side effects.
1092  if (RV)
1093  EmitAnyExpr(RV);
1094  } else if (!RV) {
1095  // Do nothing (return value is left uninitialized)
1096  } else if (FnRetTy->isReferenceType()) {
1097  // If this function returns a reference, take the address of the expression
1098  // rather than the value.
1099  RValue Result = EmitReferenceBindingToExpr(RV);
1101  } else {
1102  switch (getEvaluationKind(RV->getType())) {
1103  case TEK_Scalar:
1105  break;
1106  case TEK_Complex:
1108  /*isInit*/ true);
1109  break;
1110  case TEK_Aggregate:
1117  break;
1118  }
1119  }
1120 
1121  ++NumReturnExprs;
1122  if (!RV || RV->isEvaluatable(getContext()))
1123  ++NumSimpleReturnExprs;
1124 
1125  cleanupScope.ForceCleanup();
1127 }
1128 
1130  // As long as debug info is modeled with instructions, we have to ensure we
1131  // have a place to insert here and write the stop point here.
1132  if (HaveInsertPoint())
1133  EmitStopPoint(&S);
1134 
1135  for (const auto *I : S.decls())
1136  EmitDecl(*I);
1137 }
1138 
1140  assert(!BreakContinueStack.empty() && "break stmt not in a loop or switch!");
1141 
1142  // If this code is reachable then emit a stop point (if generating
1143  // debug info). We have to do this ourselves because we are on the
1144  // "simple" statement path.
1145  if (HaveInsertPoint())
1146  EmitStopPoint(&S);
1147 
1148  EmitBranchThroughCleanup(BreakContinueStack.back().BreakBlock);
1149 }
1150 
1152  assert(!BreakContinueStack.empty() && "continue stmt not in a loop!");
1153 
1154  // If this code is reachable then emit a stop point (if generating
1155  // debug info). We have to do this ourselves because we are on the
1156  // "simple" statement path.
1157  if (HaveInsertPoint())
1158  EmitStopPoint(&S);
1159 
1160  EmitBranchThroughCleanup(BreakContinueStack.back().ContinueBlock);
1161 }
1162 
1163 /// EmitCaseStmtRange - If case statement range is not too big then
1164 /// add multiple cases to switch instruction, one for each value within
1165 /// the range. If range is too big then emit "if" condition check.
1167  assert(S.getRHS() && "Expected RHS value in CaseStmt");
1168 
1171 
1172  // Emit the code for this case. We do this first to make sure it is
1173  // properly chained from our predecessor before generating the
1174  // switch machinery to enter this block.
1175  llvm::BasicBlock *CaseDest = createBasicBlock("sw.bb");
1176  EmitBlockWithFallThrough(CaseDest, &S);
1177  EmitStmt(S.getSubStmt());
1178 
1179  // If range is empty, do nothing.
1180  if (LHS.isSigned() ? RHS.slt(LHS) : RHS.ult(LHS))
1181  return;
1182 
1183  llvm::APInt Range = RHS - LHS;
1184  // FIXME: parameters such as this should not be hardcoded.
1185  if (Range.ult(llvm::APInt(Range.getBitWidth(), 64))) {
1186  // Range is small enough to add multiple switch instruction cases.
1187  uint64_t Total = getProfileCount(&S);
1188  unsigned NCases = Range.getZExtValue() + 1;
1189  // We only have one region counter for the entire set of cases here, so we
1190  // need to divide the weights evenly between the generated cases, ensuring
1191  // that the total weight is preserved. E.g., a weight of 5 over three cases
1192  // will be distributed as weights of 2, 2, and 1.
1193  uint64_t Weight = Total / NCases, Rem = Total % NCases;
1194  for (unsigned I = 0; I != NCases; ++I) {
1195  if (SwitchWeights)
1196  SwitchWeights->push_back(Weight + (Rem ? 1 : 0));
1197  if (Rem)
1198  Rem--;
1199  SwitchInsn->addCase(Builder.getInt(LHS), CaseDest);
1200  ++LHS;
1201  }
1202  return;
1203  }
1204 
1205  // The range is too big. Emit "if" condition into a new block,
1206  // making sure to save and restore the current insertion point.
1207  llvm::BasicBlock *RestoreBB = Builder.GetInsertBlock();
1208 
1209  // Push this test onto the chain of range checks (which terminates
1210  // in the default basic block). The switch's default will be changed
1211  // to the top of this chain after switch emission is complete.
1212  llvm::BasicBlock *FalseDest = CaseRangeBlock;
1213  CaseRangeBlock = createBasicBlock("sw.caserange");
1214 
1215  CurFn->getBasicBlockList().push_back(CaseRangeBlock);
1216  Builder.SetInsertPoint(CaseRangeBlock);
1217 
1218  // Emit range check.
1219  llvm::Value *Diff =
1220  Builder.CreateSub(SwitchInsn->getCondition(), Builder.getInt(LHS));
1221  llvm::Value *Cond =
1222  Builder.CreateICmpULE(Diff, Builder.getInt(Range), "inbounds");
1223 
1224  llvm::MDNode *Weights = nullptr;
1225  if (SwitchWeights) {
1226  uint64_t ThisCount = getProfileCount(&S);
1227  uint64_t DefaultCount = (*SwitchWeights)[0];
1228  Weights = createProfileWeights(ThisCount, DefaultCount);
1229 
1230  // Since we're chaining the switch default through each large case range, we
1231  // need to update the weight for the default, ie, the first case, to include
1232  // this case.
1233  (*SwitchWeights)[0] += ThisCount;
1234  }
1235  Builder.CreateCondBr(Cond, CaseDest, FalseDest, Weights);
1236 
1237  // Restore the appropriate insertion point.
1238  if (RestoreBB)
1239  Builder.SetInsertPoint(RestoreBB);
1240  else
1241  Builder.ClearInsertionPoint();
1242 }
1243 
1245  // If there is no enclosing switch instance that we're aware of, then this
1246  // case statement and its block can be elided. This situation only happens
1247  // when we've constant-folded the switch, are emitting the constant case,
1248  // and part of the constant case includes another case statement. For
1249  // instance: switch (4) { case 4: do { case 5: } while (1); }
1250  if (!SwitchInsn) {
1251  EmitStmt(S.getSubStmt());
1252  return;
1253  }
1254 
1255  // Handle case ranges.
1256  if (S.getRHS()) {
1257  EmitCaseStmtRange(S);
1258  return;
1259  }
1260 
1261  llvm::ConstantInt *CaseVal =
1263 
1264  // If the body of the case is just a 'break', try to not emit an empty block.
1265  // If we're profiling or we're not optimizing, leave the block in for better
1266  // debug and coverage analysis.
1268  CGM.getCodeGenOpts().OptimizationLevel > 0 &&
1269  isa<BreakStmt>(S.getSubStmt())) {
1270  JumpDest Block = BreakContinueStack.back().BreakBlock;
1271 
1272  // Only do this optimization if there are no cleanups that need emitting.
1273  if (isObviouslyBranchWithoutCleanups(Block)) {
1274  if (SwitchWeights)
1275  SwitchWeights->push_back(getProfileCount(&S));
1276  SwitchInsn->addCase(CaseVal, Block.getBlock());
1277 
1278  // If there was a fallthrough into this case, make sure to redirect it to
1279  // the end of the switch as well.
1280  if (Builder.GetInsertBlock()) {
1281  Builder.CreateBr(Block.getBlock());
1282  Builder.ClearInsertionPoint();
1283  }
1284  return;
1285  }
1286  }
1287 
1288  llvm::BasicBlock *CaseDest = createBasicBlock("sw.bb");
1289  EmitBlockWithFallThrough(CaseDest, &S);
1290  if (SwitchWeights)
1291  SwitchWeights->push_back(getProfileCount(&S));
1292  SwitchInsn->addCase(CaseVal, CaseDest);
1293 
1294  // Recursively emitting the statement is acceptable, but is not wonderful for
1295  // code where we have many case statements nested together, i.e.:
1296  // case 1:
1297  // case 2:
1298  // case 3: etc.
1299  // Handling this recursively will create a new block for each case statement
1300  // that falls through to the next case which is IR intensive. It also causes
1301  // deep recursion which can run into stack depth limitations. Handle
1302  // sequential non-range case statements specially.
1303  const CaseStmt *CurCase = &S;
1304  const CaseStmt *NextCase = dyn_cast<CaseStmt>(S.getSubStmt());
1305 
1306  // Otherwise, iteratively add consecutive cases to this switch stmt.
1307  while (NextCase && NextCase->getRHS() == nullptr) {
1308  CurCase = NextCase;
1309  llvm::ConstantInt *CaseVal =
1310  Builder.getInt(CurCase->getLHS()->EvaluateKnownConstInt(getContext()));
1311 
1312  if (SwitchWeights)
1313  SwitchWeights->push_back(getProfileCount(NextCase));
1315  CaseDest = createBasicBlock("sw.bb");
1316  EmitBlockWithFallThrough(CaseDest, &S);
1317  }
1318 
1319  SwitchInsn->addCase(CaseVal, CaseDest);
1320  NextCase = dyn_cast<CaseStmt>(CurCase->getSubStmt());
1321  }
1322 
1323  // Normal default recursion for non-cases.
1324  EmitStmt(CurCase->getSubStmt());
1325 }
1326 
1328  // If there is no enclosing switch instance that we're aware of, then this
1329  // default statement can be elided. This situation only happens when we've
1330  // constant-folded the switch.
1331  if (!SwitchInsn) {
1332  EmitStmt(S.getSubStmt());
1333  return;
1334  }
1335 
1336  llvm::BasicBlock *DefaultBlock = SwitchInsn->getDefaultDest();
1337  assert(DefaultBlock->empty() &&
1338  "EmitDefaultStmt: Default block already defined?");
1339 
1340  EmitBlockWithFallThrough(DefaultBlock, &S);
1341 
1342  EmitStmt(S.getSubStmt());
1343 }
1344 
1345 /// CollectStatementsForCase - Given the body of a 'switch' statement and a
1346 /// constant value that is being switched on, see if we can dead code eliminate
1347 /// the body of the switch to a simple series of statements to emit. Basically,
1348 /// on a switch (5) we want to find these statements:
1349 /// case 5:
1350 /// printf(...); <--
1351 /// ++i; <--
1352 /// break;
1353 ///
1354 /// and add them to the ResultStmts vector. If it is unsafe to do this
1355 /// transformation (for example, one of the elided statements contains a label
1356 /// that might be jumped to), return CSFC_Failure. If we handled it and 'S'
1357 /// should include statements after it (e.g. the printf() line is a substmt of
1358 /// the case) then return CSFC_FallThrough. If we handled it and found a break
1359 /// statement, then return CSFC_Success.
1360 ///
1361 /// If Case is non-null, then we are looking for the specified case, checking
1362 /// that nothing we jump over contains labels. If Case is null, then we found
1363 /// the case and are looking for the break.
1364 ///
1365 /// If the recursive walk actually finds our Case, then we set FoundCase to
1366 /// true.
1367 ///
1370  const SwitchCase *Case,
1371  bool &FoundCase,
1372  SmallVectorImpl<const Stmt*> &ResultStmts) {
1373  // If this is a null statement, just succeed.
1374  if (!S)
1375  return Case ? CSFC_Success : CSFC_FallThrough;
1376 
1377  // If this is the switchcase (case 4: or default) that we're looking for, then
1378  // we're in business. Just add the substatement.
1379  if (const SwitchCase *SC = dyn_cast<SwitchCase>(S)) {
1380  if (S == Case) {
1381  FoundCase = true;
1382  return CollectStatementsForCase(SC->getSubStmt(), nullptr, FoundCase,
1383  ResultStmts);
1384  }
1385 
1386  // Otherwise, this is some other case or default statement, just ignore it.
1387  return CollectStatementsForCase(SC->getSubStmt(), Case, FoundCase,
1388  ResultStmts);
1389  }
1390 
1391  // If we are in the live part of the code and we found our break statement,
1392  // return a success!
1393  if (!Case && isa<BreakStmt>(S))
1394  return CSFC_Success;
1395 
1396  // If this is a switch statement, then it might contain the SwitchCase, the
1397  // break, or neither.
1398  if (const CompoundStmt *CS = dyn_cast<CompoundStmt>(S)) {
1399  // Handle this as two cases: we might be looking for the SwitchCase (if so
1400  // the skipped statements must be skippable) or we might already have it.
1401  CompoundStmt::const_body_iterator I = CS->body_begin(), E = CS->body_end();
1402  bool StartedInLiveCode = FoundCase;
1403  unsigned StartSize = ResultStmts.size();
1404 
1405  // If we've not found the case yet, scan through looking for it.
1406  if (Case) {
1407  // Keep track of whether we see a skipped declaration. The code could be
1408  // using the declaration even if it is skipped, so we can't optimize out
1409  // the decl if the kept statements might refer to it.
1410  bool HadSkippedDecl = false;
1411 
1412  // If we're looking for the case, just see if we can skip each of the
1413  // substatements.
1414  for (; Case && I != E; ++I) {
1415  HadSkippedDecl |= CodeGenFunction::mightAddDeclToScope(*I);
1416 
1417  switch (CollectStatementsForCase(*I, Case, FoundCase, ResultStmts)) {
1418  case CSFC_Failure: return CSFC_Failure;
1419  case CSFC_Success:
1420  // A successful result means that either 1) that the statement doesn't
1421  // have the case and is skippable, or 2) does contain the case value
1422  // and also contains the break to exit the switch. In the later case,
1423  // we just verify the rest of the statements are elidable.
1424  if (FoundCase) {
1425  // If we found the case and skipped declarations, we can't do the
1426  // optimization.
1427  if (HadSkippedDecl)
1428  return CSFC_Failure;
1429 
1430  for (++I; I != E; ++I)
1431  if (CodeGenFunction::ContainsLabel(*I, true))
1432  return CSFC_Failure;
1433  return CSFC_Success;
1434  }
1435  break;
1436  case CSFC_FallThrough:
1437  // If we have a fallthrough condition, then we must have found the
1438  // case started to include statements. Consider the rest of the
1439  // statements in the compound statement as candidates for inclusion.
1440  assert(FoundCase && "Didn't find case but returned fallthrough?");
1441  // We recursively found Case, so we're not looking for it anymore.
1442  Case = nullptr;
1443 
1444  // If we found the case and skipped declarations, we can't do the
1445  // optimization.
1446  if (HadSkippedDecl)
1447  return CSFC_Failure;
1448  break;
1449  }
1450  }
1451 
1452  if (!FoundCase)
1453  return CSFC_Success;
1454 
1455  assert(!HadSkippedDecl && "fallthrough after skipping decl");
1456  }
1457 
1458  // If we have statements in our range, then we know that the statements are
1459  // live and need to be added to the set of statements we're tracking.
1460  bool AnyDecls = false;
1461  for (; I != E; ++I) {
1462  AnyDecls |= CodeGenFunction::mightAddDeclToScope(*I);
1463 
1464  switch (CollectStatementsForCase(*I, nullptr, FoundCase, ResultStmts)) {
1465  case CSFC_Failure: return CSFC_Failure;
1466  case CSFC_FallThrough:
1467  // A fallthrough result means that the statement was simple and just
1468  // included in ResultStmt, keep adding them afterwards.
1469  break;
1470  case CSFC_Success:
1471  // A successful result means that we found the break statement and
1472  // stopped statement inclusion. We just ensure that any leftover stmts
1473  // are skippable and return success ourselves.
1474  for (++I; I != E; ++I)
1475  if (CodeGenFunction::ContainsLabel(*I, true))
1476  return CSFC_Failure;
1477  return CSFC_Success;
1478  }
1479  }
1480 
1481  // If we're about to fall out of a scope without hitting a 'break;', we
1482  // can't perform the optimization if there were any decls in that scope
1483  // (we'd lose their end-of-lifetime).
1484  if (AnyDecls) {
1485  // If the entire compound statement was live, there's one more thing we
1486  // can try before giving up: emit the whole thing as a single statement.
1487  // We can do that unless the statement contains a 'break;'.
1488  // FIXME: Such a break must be at the end of a construct within this one.
1489  // We could emit this by just ignoring the BreakStmts entirely.
1490  if (StartedInLiveCode && !CodeGenFunction::containsBreak(S)) {
1491  ResultStmts.resize(StartSize);
1492  ResultStmts.push_back(S);
1493  } else {
1494  return CSFC_Failure;
1495  }
1496  }
1497 
1498  return CSFC_FallThrough;
1499  }
1500 
1501  // Okay, this is some other statement that we don't handle explicitly, like a
1502  // for statement or increment etc. If we are skipping over this statement,
1503  // just verify it doesn't have labels, which would make it invalid to elide.
1504  if (Case) {
1505  if (CodeGenFunction::ContainsLabel(S, true))
1506  return CSFC_Failure;
1507  return CSFC_Success;
1508  }
1509 
1510  // Otherwise, we want to include this statement. Everything is cool with that
1511  // so long as it doesn't contain a break out of the switch we're in.
1513 
1514  // Otherwise, everything is great. Include the statement and tell the caller
1515  // that we fall through and include the next statement as well.
1516  ResultStmts.push_back(S);
1517  return CSFC_FallThrough;
1518 }
1519 
1520 /// FindCaseStatementsForValue - Find the case statement being jumped to and
1521 /// then invoke CollectStatementsForCase to find the list of statements to emit
1522 /// for a switch on constant. See the comment above CollectStatementsForCase
1523 /// for more details.
1525  const llvm::APSInt &ConstantCondValue,
1526  SmallVectorImpl<const Stmt*> &ResultStmts,
1527  ASTContext &C,
1528  const SwitchCase *&ResultCase) {
1529  // First step, find the switch case that is being branched to. We can do this
1530  // efficiently by scanning the SwitchCase list.
1531  const SwitchCase *Case = S.getSwitchCaseList();
1532  const DefaultStmt *DefaultCase = nullptr;
1533 
1534  for (; Case; Case = Case->getNextSwitchCase()) {
1535  // It's either a default or case. Just remember the default statement in
1536  // case we're not jumping to any numbered cases.
1537  if (const DefaultStmt *DS = dyn_cast<DefaultStmt>(Case)) {
1538  DefaultCase = DS;
1539  continue;
1540  }
1541 
1542  // Check to see if this case is the one we're looking for.
1543  const CaseStmt *CS = cast<CaseStmt>(Case);
1544  // Don't handle case ranges yet.
1545  if (CS->getRHS()) return false;
1546 
1547  // If we found our case, remember it as 'case'.
1548  if (CS->getLHS()->EvaluateKnownConstInt(C) == ConstantCondValue)
1549  break;
1550  }
1551 
1552  // If we didn't find a matching case, we use a default if it exists, or we
1553  // elide the whole switch body!
1554  if (!Case) {
1555  // It is safe to elide the body of the switch if it doesn't contain labels
1556  // etc. If it is safe, return successfully with an empty ResultStmts list.
1557  if (!DefaultCase)
1558  return !CodeGenFunction::ContainsLabel(&S);
1559  Case = DefaultCase;
1560  }
1561 
1562  // Ok, we know which case is being jumped to, try to collect all the
1563  // statements that follow it. This can fail for a variety of reasons. Also,
1564  // check to see that the recursive walk actually found our case statement.
1565  // Insane cases like this can fail to find it in the recursive walk since we
1566  // don't handle every stmt kind:
1567  // switch (4) {
1568  // while (1) {
1569  // case 4: ...
1570  bool FoundCase = false;
1571  ResultCase = Case;
1572  return CollectStatementsForCase(S.getBody(), Case, FoundCase,
1573  ResultStmts) != CSFC_Failure &&
1574  FoundCase;
1575 }
1576 
1578  // Handle nested switch statements.
1579  llvm::SwitchInst *SavedSwitchInsn = SwitchInsn;
1580  SmallVector<uint64_t, 16> *SavedSwitchWeights = SwitchWeights;
1581  llvm::BasicBlock *SavedCRBlock = CaseRangeBlock;
1582 
1583  // See if we can constant fold the condition of the switch and therefore only
1584  // emit the live case statement (if any) of the switch.
1585  llvm::APSInt ConstantCondValue;
1586  if (ConstantFoldsToSimpleInteger(S.getCond(), ConstantCondValue)) {
1587  SmallVector<const Stmt*, 4> CaseStmts;
1588  const SwitchCase *Case = nullptr;
1589  if (FindCaseStatementsForValue(S, ConstantCondValue, CaseStmts,
1590  getContext(), Case)) {
1591  if (Case)
1593  RunCleanupsScope ExecutedScope(*this);
1594 
1595  if (S.getInit())
1596  EmitStmt(S.getInit());
1597 
1598  // Emit the condition variable if needed inside the entire cleanup scope
1599  // used by this special case for constant folded switches.
1600  if (S.getConditionVariable())
1602 
1603  // At this point, we are no longer "within" a switch instance, so
1604  // we can temporarily enforce this to ensure that any embedded case
1605  // statements are not emitted.
1606  SwitchInsn = nullptr;
1607 
1608  // Okay, we can dead code eliminate everything except this case. Emit the
1609  // specified series of statements and we're good.
1610  for (unsigned i = 0, e = CaseStmts.size(); i != e; ++i)
1611  EmitStmt(CaseStmts[i]);
1613 
1614  // Now we want to restore the saved switch instance so that nested
1615  // switches continue to function properly
1616  SwitchInsn = SavedSwitchInsn;
1617 
1618  return;
1619  }
1620  }
1621 
1622  JumpDest SwitchExit = getJumpDestInCurrentScope("sw.epilog");
1623 
1624  RunCleanupsScope ConditionScope(*this);
1625 
1626  if (S.getInit())
1627  EmitStmt(S.getInit());
1628 
1629  if (S.getConditionVariable())
1631  llvm::Value *CondV = EmitScalarExpr(S.getCond());
1632 
1633  // Create basic block to hold stuff that comes after switch
1634  // statement. We also need to create a default block now so that
1635  // explicit case ranges tests can have a place to jump to on
1636  // failure.
1637  llvm::BasicBlock *DefaultBlock = createBasicBlock("sw.default");
1638  SwitchInsn = Builder.CreateSwitch(CondV, DefaultBlock);
1639  if (PGO.haveRegionCounts()) {
1640  // Walk the SwitchCase list to find how many there are.
1641  uint64_t DefaultCount = 0;
1642  unsigned NumCases = 0;
1643  for (const SwitchCase *Case = S.getSwitchCaseList();
1644  Case;
1645  Case = Case->getNextSwitchCase()) {
1646  if (isa<DefaultStmt>(Case))
1647  DefaultCount = getProfileCount(Case);
1648  NumCases += 1;
1649  }
1650  SwitchWeights = new SmallVector<uint64_t, 16>();
1651  SwitchWeights->reserve(NumCases);
1652  // The default needs to be first. We store the edge count, so we already
1653  // know the right weight.
1654  SwitchWeights->push_back(DefaultCount);
1655  }
1656  CaseRangeBlock = DefaultBlock;
1657 
1658  // Clear the insertion point to indicate we are in unreachable code.
1659  Builder.ClearInsertionPoint();
1660 
1661  // All break statements jump to NextBlock. If BreakContinueStack is non-empty
1662  // then reuse last ContinueBlock.
1663  JumpDest OuterContinue;
1664  if (!BreakContinueStack.empty())
1665  OuterContinue = BreakContinueStack.back().ContinueBlock;
1666 
1667  BreakContinueStack.push_back(BreakContinue(SwitchExit, OuterContinue));
1668 
1669  // Emit switch body.
1670  EmitStmt(S.getBody());
1671 
1672  BreakContinueStack.pop_back();
1673 
1674  // Update the default block in case explicit case range tests have
1675  // been chained on top.
1676  SwitchInsn->setDefaultDest(CaseRangeBlock);
1677 
1678  // If a default was never emitted:
1679  if (!DefaultBlock->getParent()) {
1680  // If we have cleanups, emit the default block so that there's a
1681  // place to jump through the cleanups from.
1682  if (ConditionScope.requiresCleanups()) {
1683  EmitBlock(DefaultBlock);
1684 
1685  // Otherwise, just forward the default block to the switch end.
1686  } else {
1687  DefaultBlock->replaceAllUsesWith(SwitchExit.getBlock());
1688  delete DefaultBlock;
1689  }
1690  }
1691 
1692  ConditionScope.ForceCleanup();
1693 
1694  // Emit continuation.
1695  EmitBlock(SwitchExit.getBlock(), true);
1697 
1698  // If the switch has a condition wrapped by __builtin_unpredictable,
1699  // create metadata that specifies that the switch is unpredictable.
1700  // Don't bother if not optimizing because that metadata would not be used.
1701  auto *Call = dyn_cast<CallExpr>(S.getCond());
1702  if (Call && CGM.getCodeGenOpts().OptimizationLevel != 0) {
1703  auto *FD = dyn_cast_or_null<FunctionDecl>(Call->getCalleeDecl());
1704  if (FD && FD->getBuiltinID() == Builtin::BI__builtin_unpredictable) {
1705  llvm::MDBuilder MDHelper(getLLVMContext());
1706  SwitchInsn->setMetadata(llvm::LLVMContext::MD_unpredictable,
1707  MDHelper.createUnpredictable());
1708  }
1709  }
1710 
1711  if (SwitchWeights) {
1712  assert(SwitchWeights->size() == 1 + SwitchInsn->getNumCases() &&
1713  "switch weights do not match switch cases");
1714  // If there's only one jump destination there's no sense weighting it.
1715  if (SwitchWeights->size() > 1)
1716  SwitchInsn->setMetadata(llvm::LLVMContext::MD_prof,
1717  createProfileWeights(*SwitchWeights));
1718  delete SwitchWeights;
1719  }
1720  SwitchInsn = SavedSwitchInsn;
1721  SwitchWeights = SavedSwitchWeights;
1722  CaseRangeBlock = SavedCRBlock;
1723 }
1724 
1725 static std::string
1726 SimplifyConstraint(const char *Constraint, const TargetInfo &Target,
1728  std::string Result;
1729 
1730  while (*Constraint) {
1731  switch (*Constraint) {
1732  default:
1733  Result += Target.convertConstraint(Constraint);
1734  break;
1735  // Ignore these
1736  case '*':
1737  case '?':
1738  case '!':
1739  case '=': // Will see this and the following in mult-alt constraints.
1740  case '+':
1741  break;
1742  case '#': // Ignore the rest of the constraint alternative.
1743  while (Constraint[1] && Constraint[1] != ',')
1744  Constraint++;
1745  break;
1746  case '&':
1747  case '%':
1748  Result += *Constraint;
1749  while (Constraint[1] && Constraint[1] == *Constraint)
1750  Constraint++;
1751  break;
1752  case ',':
1753  Result += "|";
1754  break;
1755  case 'g':
1756  Result += "imr";
1757  break;
1758  case '[': {
1759  assert(OutCons &&
1760  "Must pass output names to constraints with a symbolic name");
1761  unsigned Index;
1762  bool result = Target.resolveSymbolicName(Constraint, *OutCons, Index);
1763  assert(result && "Could not resolve symbolic name"); (void)result;
1764  Result += llvm::utostr(Index);
1765  break;
1766  }
1767  }
1768 
1769  Constraint++;
1770  }
1771 
1772  return Result;
1773 }
1774 
1775 /// AddVariableConstraints - Look at AsmExpr and if it is a variable declared
1776 /// as using a particular register add that as a constraint that will be used
1777 /// in this asm stmt.
1778 static std::string
1779 AddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr,
1781  const AsmStmt &Stmt, const bool EarlyClobber) {
1782  const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(&AsmExpr);
1783  if (!AsmDeclRef)
1784  return Constraint;
1785  const ValueDecl &Value = *AsmDeclRef->getDecl();
1786  const VarDecl *Variable = dyn_cast<VarDecl>(&Value);
1787  if (!Variable)
1788  return Constraint;
1789  if (Variable->getStorageClass() != SC_Register)
1790  return Constraint;
1791  AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>();
1792  if (!Attr)
1793  return Constraint;
1794  StringRef Register = Attr->getLabel();
1795  assert(Target.isValidGCCRegisterName(Register));
1796  // We're using validateOutputConstraint here because we only care if
1797  // this is a register constraint.
1798  TargetInfo::ConstraintInfo Info(Constraint, "");
1799  if (Target.validateOutputConstraint(Info) &&
1800  !Info.allowsRegister()) {
1801  CGM.ErrorUnsupported(&Stmt, "__asm__");
1802  return Constraint;
1803  }
1804  // Canonicalize the register here before returning it.
1805  Register = Target.getNormalizedGCCRegisterName(Register);
1806  return (EarlyClobber ? "&{" : "{") + Register.str() + "}";
1807 }
1808 
1809 llvm::Value*
1810 CodeGenFunction::EmitAsmInputLValue(const TargetInfo::ConstraintInfo &Info,
1811  LValue InputValue, QualType InputType,
1812  std::string &ConstraintStr,
1813  SourceLocation Loc) {
1814  llvm::Value *Arg;
1815  if (Info.allowsRegister() || !Info.allowsMemory()) {
1817  Arg = EmitLoadOfLValue(InputValue, Loc).getScalarVal();
1818  } else {
1819  llvm::Type *Ty = ConvertType(InputType);
1820  uint64_t Size = CGM.getDataLayout().getTypeSizeInBits(Ty);
1821  if (Size <= 64 && llvm::isPowerOf2_64(Size)) {
1822  Ty = llvm::IntegerType::get(getLLVMContext(), Size);
1823  Ty = llvm::PointerType::getUnqual(Ty);
1824 
1825  Arg = Builder.CreateLoad(Builder.CreateBitCast(InputValue.getAddress(),
1826  Ty));
1827  } else {
1828  Arg = InputValue.getPointer();
1829  ConstraintStr += '*';
1830  }
1831  }
1832  } else {
1833  Arg = InputValue.getPointer();
1834  ConstraintStr += '*';
1835  }
1836 
1837  return Arg;
1838 }
1839 
1840 llvm::Value* CodeGenFunction::EmitAsmInput(
1841  const TargetInfo::ConstraintInfo &Info,
1842  const Expr *InputExpr,
1843  std::string &ConstraintStr) {
1844  // If this can't be a register or memory, i.e., has to be a constant
1845  // (immediate or symbolic), try to emit it as such.
1846  if (!Info.allowsRegister() && !Info.allowsMemory()) {
1847  if (Info.requiresImmediateConstant()) {
1848  Expr::EvalResult EVResult;
1849  InputExpr->EvaluateAsRValue(EVResult, getContext(), true);
1850 
1851  llvm::APSInt IntResult;
1852  if (EVResult.Val.toIntegralConstant(IntResult, InputExpr->getType(),
1853  getContext()))
1854  return llvm::ConstantInt::get(getLLVMContext(), IntResult);
1855  }
1856 
1857  Expr::EvalResult Result;
1858  if (InputExpr->EvaluateAsInt(Result, getContext()))
1859  return llvm::ConstantInt::get(getLLVMContext(), Result.Val.getInt());
1860  }
1861 
1862  if (Info.allowsRegister() || !Info.allowsMemory())
1864  return EmitScalarExpr(InputExpr);
1865  if (InputExpr->getStmtClass() == Expr::CXXThisExprClass)
1866  return EmitScalarExpr(InputExpr);
1867  InputExpr = InputExpr->IgnoreParenNoopCasts(getContext());
1868  LValue Dest = EmitLValue(InputExpr);
1869  return EmitAsmInputLValue(Info, Dest, InputExpr->getType(), ConstraintStr,
1870  InputExpr->getExprLoc());
1871 }
1872 
1873 /// getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline
1874 /// asm call instruction. The !srcloc MDNode contains a list of constant
1875 /// integers which are the source locations of the start of each line in the
1876 /// asm.
1877 static llvm::MDNode *getAsmSrcLocInfo(const StringLiteral *Str,
1878  CodeGenFunction &CGF) {
1880  // Add the location of the first line to the MDNode.
1881  Locs.push_back(llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
1882  CGF.Int32Ty, Str->getBeginLoc().getRawEncoding())));
1883  StringRef StrVal = Str->getString();
1884  if (!StrVal.empty()) {
1885  const SourceManager &SM = CGF.CGM.getContext().getSourceManager();
1886  const LangOptions &LangOpts = CGF.CGM.getLangOpts();
1887  unsigned StartToken = 0;
1888  unsigned ByteOffset = 0;
1889 
1890  // Add the location of the start of each subsequent line of the asm to the
1891  // MDNode.
1892  for (unsigned i = 0, e = StrVal.size() - 1; i != e; ++i) {
1893  if (StrVal[i] != '\n') continue;
1894  SourceLocation LineLoc = Str->getLocationOfByte(
1895  i + 1, SM, LangOpts, CGF.getTarget(), &StartToken, &ByteOffset);
1896  Locs.push_back(llvm::ConstantAsMetadata::get(
1897  llvm::ConstantInt::get(CGF.Int32Ty, LineLoc.getRawEncoding())));
1898  }
1899  }
1900 
1901  return llvm::MDNode::get(CGF.getLLVMContext(), Locs);
1902 }
1903 
1904 static void UpdateAsmCallInst(llvm::CallBase &Result, bool HasSideEffect,
1905  bool ReadOnly, bool ReadNone, const AsmStmt &S,
1906  const std::vector<llvm::Type *> &ResultRegTypes,
1907  CodeGenFunction &CGF,
1908  std::vector<llvm::Value *> &RegResults) {
1909  Result.addAttribute(llvm::AttributeList::FunctionIndex,
1910  llvm::Attribute::NoUnwind);
1911  // Attach readnone and readonly attributes.
1912  if (!HasSideEffect) {
1913  if (ReadNone)
1914  Result.addAttribute(llvm::AttributeList::FunctionIndex,
1915  llvm::Attribute::ReadNone);
1916  else if (ReadOnly)
1917  Result.addAttribute(llvm::AttributeList::FunctionIndex,
1918  llvm::Attribute::ReadOnly);
1919  }
1920 
1921  // Slap the source location of the inline asm into a !srcloc metadata on the
1922  // call.
1923  if (const auto *gccAsmStmt = dyn_cast<GCCAsmStmt>(&S))
1924  Result.setMetadata("srcloc",
1925  getAsmSrcLocInfo(gccAsmStmt->getAsmString(), CGF));
1926  else {
1927  // At least put the line number on MS inline asm blobs.
1928  llvm::Constant *Loc = llvm::ConstantInt::get(CGF.Int32Ty,
1929  S.getAsmLoc().getRawEncoding());
1930  Result.setMetadata("srcloc",
1931  llvm::MDNode::get(CGF.getLLVMContext(),
1932  llvm::ConstantAsMetadata::get(Loc)));
1933  }
1934 
1936  // Conservatively, mark all inline asm blocks in CUDA or OpenCL as
1937  // convergent (meaning, they may call an intrinsically convergent op, such
1938  // as bar.sync, and so can't have certain optimizations applied around
1939  // them).
1940  Result.addAttribute(llvm::AttributeList::FunctionIndex,
1941  llvm::Attribute::Convergent);
1942  // Extract all of the register value results from the asm.
1943  if (ResultRegTypes.size() == 1) {
1944  RegResults.push_back(&Result);
1945  } else {
1946  for (unsigned i = 0, e = ResultRegTypes.size(); i != e; ++i) {
1947  llvm::Value *Tmp = CGF.Builder.CreateExtractValue(&Result, i, "asmresult");
1948  RegResults.push_back(Tmp);
1949  }
1950  }
1951 }
1952 
1954  // Assemble the final asm string.
1955  std::string AsmString = S.generateAsmString(getContext());
1956 
1957  // Get all the output and input constraints together.
1958  SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
1959  SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
1960 
1961  for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) {
1962  StringRef Name;
1963  if (const GCCAsmStmt *GAS = dyn_cast<GCCAsmStmt>(&S))
1964  Name = GAS->getOutputName(i);
1966  bool IsValid = getTarget().validateOutputConstraint(Info); (void)IsValid;
1967  assert(IsValid && "Failed to parse output constraint");
1968  OutputConstraintInfos.push_back(Info);
1969  }
1970 
1971  for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) {
1972  StringRef Name;
1973  if (const GCCAsmStmt *GAS = dyn_cast<GCCAsmStmt>(&S))
1974  Name = GAS->getInputName(i);
1976  bool IsValid =
1977  getTarget().validateInputConstraint(OutputConstraintInfos, Info);
1978  assert(IsValid && "Failed to parse input constraint"); (void)IsValid;
1979  InputConstraintInfos.push_back(Info);
1980  }
1981 
1982  std::string Constraints;
1983 
1984  std::vector<LValue> ResultRegDests;
1985  std::vector<QualType> ResultRegQualTys;
1986  std::vector<llvm::Type *> ResultRegTypes;
1987  std::vector<llvm::Type *> ResultTruncRegTypes;
1988  std::vector<llvm::Type *> ArgTypes;
1989  std::vector<llvm::Value*> Args;
1990  llvm::BitVector ResultTypeRequiresCast;
1991 
1992  // Keep track of inout constraints.
1993  std::string InOutConstraints;
1994  std::vector<llvm::Value*> InOutArgs;
1995  std::vector<llvm::Type*> InOutArgTypes;
1996 
1997  // Keep track of out constraints for tied input operand.
1998  std::vector<std::string> OutputConstraints;
1999 
2000  // An inline asm can be marked readonly if it meets the following conditions:
2001  // - it doesn't have any sideeffects
2002  // - it doesn't clobber memory
2003  // - it doesn't return a value by-reference
2004  // It can be marked readnone if it doesn't have any input memory constraints
2005  // in addition to meeting the conditions listed above.
2006  bool ReadOnly = true, ReadNone = true;
2007 
2008  for (unsigned i = 0, e = S.getNumOutputs(); i != e; i++) {
2009  TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
2010 
2011  // Simplify the output constraint.
2012  std::string OutputConstraint(S.getOutputConstraint(i));
2013  OutputConstraint = SimplifyConstraint(OutputConstraint.c_str() + 1,
2014  getTarget(), &OutputConstraintInfos);
2015 
2016  const Expr *OutExpr = S.getOutputExpr(i);
2017  OutExpr = OutExpr->IgnoreParenNoopCasts(getContext());
2018 
2019  OutputConstraint = AddVariableConstraints(OutputConstraint, *OutExpr,
2020  getTarget(), CGM, S,
2021  Info.earlyClobber());
2022  OutputConstraints.push_back(OutputConstraint);
2023  LValue Dest = EmitLValue(OutExpr);
2024  if (!Constraints.empty())
2025  Constraints += ',';
2026 
2027  // If this is a register output, then make the inline asm return it
2028  // by-value. If this is a memory result, return the value by-reference.
2029  bool isScalarizableAggregate =
2030  hasAggregateEvaluationKind(OutExpr->getType());
2031  if (!Info.allowsMemory() && (hasScalarEvaluationKind(OutExpr->getType()) ||
2032  isScalarizableAggregate)) {
2033  Constraints += "=" + OutputConstraint;
2034  ResultRegQualTys.push_back(OutExpr->getType());
2035  ResultRegDests.push_back(Dest);
2036  ResultTruncRegTypes.push_back(ConvertTypeForMem(OutExpr->getType()));
2037  if (Info.allowsRegister() && isScalarizableAggregate) {
2038  ResultTypeRequiresCast.push_back(true);
2039  unsigned Size = getContext().getTypeSize(OutExpr->getType());
2040  llvm::Type *ConvTy = llvm::IntegerType::get(getLLVMContext(), Size);
2041  ResultRegTypes.push_back(ConvTy);
2042  } else {
2043  ResultTypeRequiresCast.push_back(false);
2044  ResultRegTypes.push_back(ResultTruncRegTypes.back());
2045  }
2046  // If this output is tied to an input, and if the input is larger, then
2047  // we need to set the actual result type of the inline asm node to be the
2048  // same as the input type.
2049  if (Info.hasMatchingInput()) {
2050  unsigned InputNo;
2051  for (InputNo = 0; InputNo != S.getNumInputs(); ++InputNo) {
2052  TargetInfo::ConstraintInfo &Input = InputConstraintInfos[InputNo];
2053  if (Input.hasTiedOperand() && Input.getTiedOperand() == i)
2054  break;
2055  }
2056  assert(InputNo != S.getNumInputs() && "Didn't find matching input!");
2057 
2058  QualType InputTy = S.getInputExpr(InputNo)->getType();
2059  QualType OutputType = OutExpr->getType();
2060 
2061  uint64_t InputSize = getContext().getTypeSize(InputTy);
2062  if (getContext().getTypeSize(OutputType) < InputSize) {
2063  // Form the asm to return the value as a larger integer or fp type.
2064  ResultRegTypes.back() = ConvertType(InputTy);
2065  }
2066  }
2067  if (llvm::Type* AdjTy =
2068  getTargetHooks().adjustInlineAsmType(*this, OutputConstraint,
2069  ResultRegTypes.back()))
2070  ResultRegTypes.back() = AdjTy;
2071  else {
2072  CGM.getDiags().Report(S.getAsmLoc(),
2073  diag::err_asm_invalid_type_in_input)
2074  << OutExpr->getType() << OutputConstraint;
2075  }
2076 
2077  // Update largest vector width for any vector types.
2078  if (auto *VT = dyn_cast<llvm::VectorType>(ResultRegTypes.back()))
2079  LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
2080  VT->getPrimitiveSizeInBits().getFixedSize());
2081  } else {
2082  ArgTypes.push_back(Dest.getAddress().getType());
2083  Args.push_back(Dest.getPointer());
2084  Constraints += "=*";
2085  Constraints += OutputConstraint;
2086  ReadOnly = ReadNone = false;
2087  }
2088 
2089  if (Info.isReadWrite()) {
2090  InOutConstraints += ',';
2091 
2092  const Expr *InputExpr = S.getOutputExpr(i);
2093  llvm::Value *Arg = EmitAsmInputLValue(Info, Dest, InputExpr->getType(),
2094  InOutConstraints,
2095  InputExpr->getExprLoc());
2096 
2097  if (llvm::Type* AdjTy =
2098  getTargetHooks().adjustInlineAsmType(*this, OutputConstraint,
2099  Arg->getType()))
2100  Arg = Builder.CreateBitCast(Arg, AdjTy);
2101 
2102  // Update largest vector width for any vector types.
2103  if (auto *VT = dyn_cast<llvm::VectorType>(Arg->getType()))
2104  LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
2105  VT->getPrimitiveSizeInBits().getFixedSize());
2106  if (Info.allowsRegister())
2107  InOutConstraints += llvm::utostr(i);
2108  else
2109  InOutConstraints += OutputConstraint;
2110 
2111  InOutArgTypes.push_back(Arg->getType());
2112  InOutArgs.push_back(Arg);
2113  }
2114  }
2115 
2116  // If this is a Microsoft-style asm blob, store the return registers (EAX:EDX)
2117  // to the return value slot. Only do this when returning in registers.
2118  if (isa<MSAsmStmt>(&S)) {
2119  const ABIArgInfo &RetAI = CurFnInfo->getReturnInfo();
2120  if (RetAI.isDirect() || RetAI.isExtend()) {
2121  // Make a fake lvalue for the return value slot.
2122  LValue ReturnSlot = MakeAddrLValue(ReturnValue, FnRetTy);
2124  *this, ReturnSlot, Constraints, ResultRegTypes, ResultTruncRegTypes,
2125  ResultRegDests, AsmString, S.getNumOutputs());
2126  SawAsmBlock = true;
2127  }
2128  }
2129 
2130  for (unsigned i = 0, e = S.getNumInputs(); i != e; i++) {
2131  const Expr *InputExpr = S.getInputExpr(i);
2132 
2133  TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
2134 
2135  if (Info.allowsMemory())
2136  ReadNone = false;
2137 
2138  if (!Constraints.empty())
2139  Constraints += ',';
2140 
2141  // Simplify the input constraint.
2142  std::string InputConstraint(S.getInputConstraint(i));
2143  InputConstraint = SimplifyConstraint(InputConstraint.c_str(), getTarget(),
2144  &OutputConstraintInfos);
2145 
2146  InputConstraint = AddVariableConstraints(
2147  InputConstraint, *InputExpr->IgnoreParenNoopCasts(getContext()),
2148  getTarget(), CGM, S, false /* No EarlyClobber */);
2149 
2150  std::string ReplaceConstraint (InputConstraint);
2151  llvm::Value *Arg = EmitAsmInput(Info, InputExpr, Constraints);
2152 
2153  // If this input argument is tied to a larger output result, extend the
2154  // input to be the same size as the output. The LLVM backend wants to see
2155  // the input and output of a matching constraint be the same size. Note
2156  // that GCC does not define what the top bits are here. We use zext because
2157  // that is usually cheaper, but LLVM IR should really get an anyext someday.
2158  if (Info.hasTiedOperand()) {
2159  unsigned Output = Info.getTiedOperand();
2160  QualType OutputType = S.getOutputExpr(Output)->getType();
2161  QualType InputTy = InputExpr->getType();
2162 
2163  if (getContext().getTypeSize(OutputType) >
2164  getContext().getTypeSize(InputTy)) {
2165  // Use ptrtoint as appropriate so that we can do our extension.
2166  if (isa<llvm::PointerType>(Arg->getType()))
2167  Arg = Builder.CreatePtrToInt(Arg, IntPtrTy);
2168  llvm::Type *OutputTy = ConvertType(OutputType);
2169  if (isa<llvm::IntegerType>(OutputTy))
2170  Arg = Builder.CreateZExt(Arg, OutputTy);
2171  else if (isa<llvm::PointerType>(OutputTy))
2172  Arg = Builder.CreateZExt(Arg, IntPtrTy);
2173  else {
2174  assert(OutputTy->isFloatingPointTy() && "Unexpected output type");
2175  Arg = Builder.CreateFPExt(Arg, OutputTy);
2176  }
2177  }
2178  // Deal with the tied operands' constraint code in adjustInlineAsmType.
2179  ReplaceConstraint = OutputConstraints[Output];
2180  }
2181  if (llvm::Type* AdjTy =
2182  getTargetHooks().adjustInlineAsmType(*this, ReplaceConstraint,
2183  Arg->getType()))
2184  Arg = Builder.CreateBitCast(Arg, AdjTy);
2185  else
2186  CGM.getDiags().Report(S.getAsmLoc(), diag::err_asm_invalid_type_in_input)
2187  << InputExpr->getType() << InputConstraint;
2188 
2189  // Update largest vector width for any vector types.
2190  if (auto *VT = dyn_cast<llvm::VectorType>(Arg->getType()))
2191  LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
2192  VT->getPrimitiveSizeInBits().getFixedSize());
2193 
2194  ArgTypes.push_back(Arg->getType());
2195  Args.push_back(Arg);
2196  Constraints += InputConstraint;
2197  }
2198 
2199  // Append the "input" part of inout constraints last.
2200  for (unsigned i = 0, e = InOutArgs.size(); i != e; i++) {
2201  ArgTypes.push_back(InOutArgTypes[i]);
2202  Args.push_back(InOutArgs[i]);
2203  }
2204  Constraints += InOutConstraints;
2205 
2206  // Labels
2208  llvm::BasicBlock *Fallthrough = nullptr;
2209  bool IsGCCAsmGoto = false;
2210  if (const auto *GS = dyn_cast<GCCAsmStmt>(&S)) {
2211  IsGCCAsmGoto = GS->isAsmGoto();
2212  if (IsGCCAsmGoto) {
2213  for (auto *E : GS->labels()) {
2214  JumpDest Dest = getJumpDestForLabel(E->getLabel());
2215  Transfer.push_back(Dest.getBlock());
2216  llvm::BlockAddress *BA =
2217  llvm::BlockAddress::get(CurFn, Dest.getBlock());
2218  Args.push_back(BA);
2219  ArgTypes.push_back(BA->getType());
2220  if (!Constraints.empty())
2221  Constraints += ',';
2222  Constraints += 'X';
2223  }
2224  StringRef Name = "asm.fallthrough";
2225  Fallthrough = createBasicBlock(Name);
2226  }
2227  }
2228 
2229  // Clobbers
2230  for (unsigned i = 0, e = S.getNumClobbers(); i != e; i++) {
2231  StringRef Clobber = S.getClobber(i);
2232 
2233  if (Clobber == "memory")
2234  ReadOnly = ReadNone = false;
2235  else if (Clobber != "cc")
2236  Clobber = getTarget().getNormalizedGCCRegisterName(Clobber);
2237 
2238  if (!Constraints.empty())
2239  Constraints += ',';
2240 
2241  Constraints += "~{";
2242  Constraints += Clobber;
2243  Constraints += '}';
2244  }
2245 
2246  // Add machine specific clobbers
2247  std::string MachineClobbers = getTarget().getClobbers();
2248  if (!MachineClobbers.empty()) {
2249  if (!Constraints.empty())
2250  Constraints += ',';
2251  Constraints += MachineClobbers;
2252  }
2253 
2254  llvm::Type *ResultType;
2255  if (ResultRegTypes.empty())
2256  ResultType = VoidTy;
2257  else if (ResultRegTypes.size() == 1)
2258  ResultType = ResultRegTypes[0];
2259  else
2260  ResultType = llvm::StructType::get(getLLVMContext(), ResultRegTypes);
2261 
2262  llvm::FunctionType *FTy =
2263  llvm::FunctionType::get(ResultType, ArgTypes, false);
2264 
2265  bool HasSideEffect = S.isVolatile() || S.getNumOutputs() == 0;
2266  llvm::InlineAsm::AsmDialect AsmDialect = isa<MSAsmStmt>(&S) ?
2267  llvm::InlineAsm::AD_Intel : llvm::InlineAsm::AD_ATT;
2268  llvm::InlineAsm *IA =
2269  llvm::InlineAsm::get(FTy, AsmString, Constraints, HasSideEffect,
2270  /* IsAlignStack */ false, AsmDialect);
2271  std::vector<llvm::Value*> RegResults;
2272  if (IsGCCAsmGoto) {
2273  llvm::CallBrInst *Result =
2274  Builder.CreateCallBr(IA, Fallthrough, Transfer, Args);
2275  UpdateAsmCallInst(cast<llvm::CallBase>(*Result), HasSideEffect, ReadOnly,
2276  ReadNone, S, ResultRegTypes, *this, RegResults);
2277  EmitBlock(Fallthrough);
2278  } else {
2279  llvm::CallInst *Result =
2280  Builder.CreateCall(IA, Args, getBundlesForFunclet(IA));
2281  UpdateAsmCallInst(cast<llvm::CallBase>(*Result), HasSideEffect, ReadOnly,
2282  ReadNone, S, ResultRegTypes, *this, RegResults);
2283  }
2284 
2285  assert(RegResults.size() == ResultRegTypes.size());
2286  assert(RegResults.size() == ResultTruncRegTypes.size());
2287  assert(RegResults.size() == ResultRegDests.size());
2288  // ResultRegDests can be also populated by addReturnRegisterOutputs() above,
2289  // in which case its size may grow.
2290  assert(ResultTypeRequiresCast.size() <= ResultRegDests.size());
2291  for (unsigned i = 0, e = RegResults.size(); i != e; ++i) {
2292  llvm::Value *Tmp = RegResults[i];
2293 
2294  // If the result type of the LLVM IR asm doesn't match the result type of
2295  // the expression, do the conversion.
2296  if (ResultRegTypes[i] != ResultTruncRegTypes[i]) {
2297  llvm::Type *TruncTy = ResultTruncRegTypes[i];
2298 
2299  // Truncate the integer result to the right size, note that TruncTy can be
2300  // a pointer.
2301  if (TruncTy->isFloatingPointTy())
2302  Tmp = Builder.CreateFPTrunc(Tmp, TruncTy);
2303  else if (TruncTy->isPointerTy() && Tmp->getType()->isIntegerTy()) {
2304  uint64_t ResSize = CGM.getDataLayout().getTypeSizeInBits(TruncTy);
2305  Tmp = Builder.CreateTrunc(Tmp,
2306  llvm::IntegerType::get(getLLVMContext(), (unsigned)ResSize));
2307  Tmp = Builder.CreateIntToPtr(Tmp, TruncTy);
2308  } else if (Tmp->getType()->isPointerTy() && TruncTy->isIntegerTy()) {
2309  uint64_t TmpSize =CGM.getDataLayout().getTypeSizeInBits(Tmp->getType());
2310  Tmp = Builder.CreatePtrToInt(Tmp,
2311  llvm::IntegerType::get(getLLVMContext(), (unsigned)TmpSize));
2312  Tmp = Builder.CreateTrunc(Tmp, TruncTy);
2313  } else if (TruncTy->isIntegerTy()) {
2314  Tmp = Builder.CreateZExtOrTrunc(Tmp, TruncTy);
2315  } else if (TruncTy->isVectorTy()) {
2316  Tmp = Builder.CreateBitCast(Tmp, TruncTy);
2317  }
2318  }
2319 
2320  LValue Dest = ResultRegDests[i];
2321  // ResultTypeRequiresCast elements correspond to the first
2322  // ResultTypeRequiresCast.size() elements of RegResults.
2323  if ((i < ResultTypeRequiresCast.size()) && ResultTypeRequiresCast[i]) {
2324  unsigned Size = getContext().getTypeSize(ResultRegQualTys[i]);
2326  ResultRegTypes[i]->getPointerTo());
2327  QualType Ty = getContext().getIntTypeForBitwidth(Size, /*Signed*/ false);
2328  if (Ty.isNull()) {
2329  const Expr *OutExpr = S.getOutputExpr(i);
2330  CGM.Error(
2331  OutExpr->getExprLoc(),
2332  "impossible constraint in asm: can't store value into a register");
2333  return;
2334  }
2335  Dest = MakeAddrLValue(A, Ty);
2336  }
2337  EmitStoreThroughLValue(RValue::get(Tmp), Dest);
2338  }
2339 }
2340 
2342  const RecordDecl *RD = S.getCapturedRecordDecl();
2343  QualType RecordTy = getContext().getRecordType(RD);
2344 
2345  // Initialize the captured struct.
2346  LValue SlotLV =
2347  MakeAddrLValue(CreateMemTemp(RecordTy, "agg.captured"), RecordTy);
2348 
2349  RecordDecl::field_iterator CurField = RD->field_begin();
2351  E = S.capture_init_end();
2352  I != E; ++I, ++CurField) {
2353  LValue LV = EmitLValueForFieldInitialization(SlotLV, *CurField);
2354  if (CurField->hasCapturedVLAType()) {
2355  auto VAT = CurField->getCapturedVLAType();
2356  EmitStoreThroughLValue(RValue::get(VLASizeMap[VAT->getSizeExpr()]), LV);
2357  } else {
2358  EmitInitializerForField(*CurField, LV, *I);
2359  }
2360  }
2361 
2362  return SlotLV;
2363 }
2364 
2365 /// Generate an outlined function for the body of a CapturedStmt, store any
2366 /// captured variables into the captured struct, and call the outlined function.
2367 llvm::Function *
2369  LValue CapStruct = InitCapturedStruct(S);
2370 
2371  // Emit the CapturedDecl
2372  CodeGenFunction CGF(CGM, true);
2373  CGCapturedStmtRAII CapInfoRAII(CGF, new CGCapturedStmtInfo(S, K));
2374  llvm::Function *F = CGF.GenerateCapturedStmtFunction(S);
2375  delete CGF.CapturedStmtInfo;
2376 
2377  // Emit call to the helper function.
2378  EmitCallOrInvoke(F, CapStruct.getPointer());
2379 
2380  return F;
2381 }
2382 
2384  LValue CapStruct = InitCapturedStruct(S);
2385  return CapStruct.getAddress();
2386 }
2387 
2388 /// Creates the outlined function for a CapturedStmt.
2389 llvm::Function *
2391  assert(CapturedStmtInfo &&
2392  "CapturedStmtInfo should be set when generating the captured function");
2393  const CapturedDecl *CD = S.getCapturedDecl();
2394  const RecordDecl *RD = S.getCapturedRecordDecl();
2395  SourceLocation Loc = S.getBeginLoc();
2396  assert(CD->hasBody() && "missing CapturedDecl body");
2397 
2398  // Build the argument list.
2399  ASTContext &Ctx = CGM.getContext();
2400  FunctionArgList Args;
2401  Args.append(CD->param_begin(), CD->param_end());
2402 
2403  // Create the function declaration.
2404  const CGFunctionInfo &FuncInfo =
2405  CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, Args);
2406  llvm::FunctionType *FuncLLVMTy = CGM.getTypes().GetFunctionType(FuncInfo);
2407 
2408  llvm::Function *F =
2411  CGM.SetInternalFunctionAttributes(CD, F, FuncInfo);
2412  if (CD->isNothrow())
2413  F->addFnAttr(llvm::Attribute::NoUnwind);
2414 
2415  // Generate the function.
2416  StartFunction(CD, Ctx.VoidTy, F, FuncInfo, Args, CD->getLocation(),
2417  CD->getBody()->getBeginLoc());
2418  // Set the context parameter in CapturedStmtInfo.
2419  Address DeclPtr = GetAddrOfLocalVar(CD->getContextParam());
2421 
2422  // Initialize variable-length arrays.
2424  Ctx.getTagDeclType(RD));
2425  for (auto *FD : RD->fields()) {
2426  if (FD->hasCapturedVLAType()) {
2427  auto *ExprArg =
2429  .getScalarVal();
2430  auto VAT = FD->getCapturedVLAType();
2431  VLASizeMap[VAT->getSizeExpr()] = ExprArg;
2432  }
2433  }
2434 
2435  // If 'this' is captured, load it into CXXThisValue.
2438  LValue ThisLValue = EmitLValueForField(Base, FD);
2439  CXXThisValue = EmitLoadOfLValue(ThisLValue, Loc).getScalarVal();
2440  }
2441 
2442  PGO.assignRegionCounters(GlobalDecl(CD), F);
2443  CapturedStmtInfo->EmitBody(*this, CD->getBody());
2445 
2446  return F;
2447 }
const CGFunctionInfo & arrangeBuiltinFunctionDeclaration(QualType resultType, const FunctionArgList &args)
A builtin function is a freestanding function using the default C conventions.
Definition: CGCall.cpp:652
bool isAggregate() const
Definition: CGValue.h:53
const llvm::DataLayout & getDataLayout() const
Expr * getInc()
Definition: Stmt.h:2417
void EmitOMPMasterTaskLoopDirective(const OMPMasterTaskLoopDirective &S)
void EmitIndirectGotoStmt(const IndirectGotoStmt &S)
Definition: CGStmt.cpp:603
void EmitCoroutineBody(const CoroutineBodyStmt &S)
virtual void EmitBody(CodeGenFunction &CGF, const Stmt *S)
Emit the captured statement body.
This represents a GCC inline-assembly statement extension.
Definition: Stmt.h:2852
void EmitOMPTaskwaitDirective(const OMPTaskwaitDirective &S)
unsigned getNumInputs() const
Definition: Stmt.h:2764
SourceLocation getBeginLoc() const
Definition: Stmt.h:2669
unsigned getRawEncoding() const
When a SourceLocation itself cannot be used, this returns an (opaque) 32-bit integer encoding for it...
A (possibly-)qualified type.
Definition: Type.h:643
capture_init_iterator capture_init_begin()
Retrieve the first initialization argument.
Definition: Stmt.h:3524
void EmitSEHLeaveStmt(const SEHLeaveStmt &S)
llvm::Type * ConvertTypeForMem(QualType T)
void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock, llvm::BasicBlock *FalseBlock, uint64_t TrueCount)
EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g.
const CodeGenOptions & getCodeGenOpts() const
static CSFC_Result CollectStatementsForCase(const Stmt *S, const SwitchCase *Case, bool &FoundCase, SmallVectorImpl< const Stmt *> &ResultStmts)
Definition: CGStmt.cpp:1369
void EmitGotoStmt(const GotoStmt &S)
Definition: CGStmt.cpp:592
void EmitAttributedStmt(const AttributedStmt &S)
Definition: CGStmt.cpp:588
param_iterator param_begin() const
Retrieve an iterator pointing to the first parameter decl.
Definition: Decl.h:4220
Address CreateMemTemp(QualType T, const Twine &Name="tmp", Address *Alloca=nullptr)
CreateMemTemp - Create a temporary memory object of the given type, with appropriate alignmen and cas...
Definition: CGExpr.cpp:139
void enterFullExpression(const FullExpr *E)
Expr * getCond()
Definition: Stmt.h:2249
bool HaveInsertPoint() const
HaveInsertPoint - True if an insertion point is defined.
void EmitOMPDistributeDirective(const OMPDistributeDirective &S)
void EmitCXXTryStmt(const CXXTryStmt &S)
Stmt - This represents one statement.
Definition: Stmt.h:66
IfStmt - This represents an if/then/else.
Definition: Stmt.h:1812
SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, const LangOptions &Features, const TargetInfo &Target, unsigned *StartToken=nullptr, unsigned *StartTokenByteOffset=nullptr) const
getLocationOfByte - Return a source location that points to the specified byte of this string literal...
Definition: Expr.cpp:1216
static stable_iterator stable_end()
Create a stable reference to the bottom of the EH stack.
Definition: EHScopeStack.h:383
bool requiresCleanups() const
Determine whether this scope requires any cleanups.
StorageClass getStorageClass() const
Returns the storage class as written in the source.
Definition: Decl.h:1034
void EmitOMPTargetSimdDirective(const OMPTargetSimdDirective &S)
unsigned getNumOutputs() const
Definition: Stmt.h:2742
Defines the PrettyStackTraceEntry class, which is used to make crashes give more contextual informati...
bool isNothrow() const
Definition: Decl.cpp:4665
llvm::Value * getTypeSize(QualType Ty)
Returns calculated size of the specified type.
Represents an attribute applied to a statement.
Definition: Stmt.h:1754
void EmitOMPOrderedDirective(const OMPOrderedDirective &S)
void EmitStoreThroughLValue(RValue Src, LValue Dst, bool isInit=false)
EmitStoreThroughLValue - Store the specified rvalue into the specified lvalue, where both are guarant...
Definition: CGExpr.cpp:1925
void EmitComplexExprIntoLValue(const Expr *E, LValue dest, bool isInit)
EmitComplexExprIntoLValue - Emit the given expression of complex type and place its result into the s...
Address GenerateCapturedStmtArgument(const CapturedStmt &S)
Definition: CGStmt.cpp:2383
bool validateInputConstraint(MutableArrayRef< ConstraintInfo > OutputConstraints, ConstraintInfo &info) const
Definition: TargetInfo.cpp:635
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1290
const RecordDecl * getCapturedRecordDecl() const
Retrieve the record declaration for captured variables.
Definition: Stmt.h:3468
stable_iterator stable_begin() const
Create a stable reference to the top of the EH stack.
Definition: EHScopeStack.h:378
LValue EmitLValueForFieldInitialization(LValue Base, const FieldDecl *Field)
EmitLValueForFieldInitialization - Like EmitLValueForField, except that if the Field is a reference...
Definition: CGExpr.cpp:4137
bool ConstantFoldsToSimpleInteger(const Expr *Cond, bool &Result, bool AllowLabels=false)
ConstantFoldsToSimpleInteger - If the specified expression does not fold to a constant, or if it does but contains a label, return false.
Represents a point when we exit a loop.
Definition: ProgramPoint.h:713
bool empty() const
Determines whether the exception-scopes stack is empty.
Definition: EHScopeStack.h:344
void EmitOMPParallelForSimdDirective(const OMPParallelForSimdDirective &S)
Stmt * getSubStmt()
Definition: Stmt.h:1645
Address GetAddrOfLocalVar(const VarDecl *VD)
GetAddrOfLocalVar - Return the address of a local variable.
Represents a variable declaration or definition.
Definition: Decl.h:827
void EmitOMPCriticalDirective(const OMPCriticalDirective &S)
const VarDecl * getNRVOCandidate() const
Retrieve the variable that might be used for the named return value optimization. ...
Definition: Stmt.h:2652
uint64_t getProfileCount(const Stmt *S)
Get the profiler&#39;s count for the given statement.
This class gathers all debug information during compilation and is responsible for emitting to llvm g...
Definition: CGDebugInfo.h:54
static bool mightAddDeclToScope(const Stmt *S)
Determine if the given statement might introduce a declaration into the current scope, by being a (possibly-labelled) DeclStmt.
DiagnosticsEngine & getDiags() const
void EmitLabel(const LabelDecl *D)
EmitLabel - Emit the block for the given label.
Definition: CGStmt.cpp:523
Stmt * getThen()
Definition: Stmt.h:1899
void EmitOMPTeamsDistributeDirective(const OMPTeamsDistributeDirective &S)
void SimplifyForwardingBlocks(llvm::BasicBlock *BB)
SimplifyForwardingBlocks - If the given basic block is only a branch to another basic block...
Definition: CGStmt.cpp:435
The collection of all-type qualifiers we support.
Definition: Type.h:137
A jump destination is an abstract label, branching to which may require a jump out through normal cle...
void EmitOMPTargetTeamsDistributeParallelForSimdDirective(const OMPTargetTeamsDistributeParallelForSimdDirective &S)
bool isObviouslyBranchWithoutCleanups(JumpDest Dest) const
isObviouslyBranchWithoutCleanups - Return true if a branch to the specified destination obviously has...
Definition: CGCleanup.cpp:1019
LabelStmt - Represents a label, which has a substatement.
Definition: Stmt.h:1710
void EmitOMPTaskLoopSimdDirective(const OMPTaskLoopSimdDirective &S)
JumpDest getJumpDestForLabel(const LabelDecl *S)
getBasicBlockForLabel - Return the LLVM basicblock that the specified label maps to.
Definition: CGStmt.cpp:512
Represents a struct/union/class.
Definition: Decl.h:3662
const TargetInfo & getTarget() const
void EmitOMPSimdDirective(const OMPSimdDirective &S)
Stmt * getBody()
Definition: Stmt.h:2353
void setScopeDepth(EHScopeStack::stable_iterator depth)
Address getAddress() const
Definition: CGValue.h:326
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:160
StringRef getNormalizedGCCRegisterName(StringRef Name, bool ReturnCanonical=false) const
Returns the "normalized" GCC register name.
Definition: TargetInfo.cpp:497
RValue EmitReferenceBindingToExpr(const Expr *E)
Emits a reference binding to the passed in expression.
Definition: CGExpr.cpp:593
FullExpr - Represents a "full-expression" node.
Definition: Expr.h:925
field_range fields() const
Definition: Decl.h:3877
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:274
Represents a member of a struct/union/class.
Definition: Decl.h:2643
ImplicitParamDecl * getContextParam() const
Retrieve the parameter containing captured variables.
Definition: Decl.h:4205
void rescopeLabels()
Change the cleanup scope of the labels in this lexical scope to match the scope of the enclosing cont...
Definition: CGStmt.cpp:561
static bool FindCaseStatementsForValue(const SwitchStmt &S, const llvm::APSInt &ConstantCondValue, SmallVectorImpl< const Stmt *> &ResultStmts, ASTContext &C, const SwitchCase *&ResultCase)
FindCaseStatementsForValue - Find the case statement being jumped to and then invoke CollectStatement...
Definition: CGStmt.cpp:1524
Stmt * getStmtExprResult()
Definition: Stmt.h:1402
bool isReferenceType() const
Definition: Type.h:6403
Stmt *const * const_body_iterator
Definition: Stmt.h:1352
static AggValueSlot forAddr(Address addr, Qualifiers quals, IsDestructed_t isDestructed, NeedsGCBarriers_t needsGC, IsAliased_t isAliased, Overlap_t mayOverlap, IsZeroed_t isZeroed=IsNotZeroed, IsSanitizerChecked_t isChecked=IsNotSanitizerChecked)
forAddr - Make a slot for an aggregate value.
Definition: CGValue.h:513
void EmitForStmt(const ForStmt &S, ArrayRef< const Attr *> Attrs=None)
Definition: CGStmt.cpp:851
__DEVICE__ int max(int __a, int __b)
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:49
void EmitOMPDistributeParallelForSimdDirective(const OMPDistributeParallelForSimdDirective &S)
void EmitInitializerForField(FieldDecl *Field, LValue LHS, Expr *Init)
Definition: CGClass.cpp:665
RValue EmitAnyExpr(const Expr *E, AggValueSlot aggSlot=AggValueSlot::ignored(), bool ignoreResult=false)
EmitAnyExpr - Emit code to compute the specified expression which can have any type.
Definition: CGExpr.cpp:194
IndirectGotoStmt - This represents an indirect goto.
Definition: Stmt.h:2494
Stmt * getBody() const override
getBody - If this Decl represents a declaration for a body of code, such as a function or method defi...
Definition: Decl.cpp:4662
static bool hasScalarEvaluationKind(QualType T)
bool hasMatchingInput() const
Return true if this output operand has a matching (tied) input operand.
Definition: TargetInfo.h:867
Expr *const * const_capture_init_iterator
Const iterator that walks over the capture initialization arguments.
Definition: Stmt.h:3511
void EmitOMPTargetTeamsDistributeSimdDirective(const OMPTargetTeamsDistributeSimdDirective &S)
ForStmt - This represents a &#39;for (init;cond;inc)&#39; stmt.
Definition: Stmt.h:2384
bool assumeFunctionsAreConvergent() const
Definition: LangOptions.h:314
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:582
void pop()
End the current loop.
Definition: CGLoopInfo.cpp:766
LabelDecl * getDecl() const
Definition: Stmt.h:1727
SourceLocation getLBracLoc() const
Definition: Stmt.h:1417
void EmitOMPCancellationPointDirective(const OMPCancellationPointDirective &S)
RAII for correct setting/restoring of CapturedStmtInfo.
const Expr * getOutputExpr(unsigned i) const
Definition: Stmt.cpp:388
param_iterator param_end() const
Retrieve an iterator one past the last parameter decl.
Definition: Decl.h:4222
Stmt * getBody()
Definition: Stmt.h:2418
void EmitOMPTeamsDistributeParallelForSimdDirective(const OMPTeamsDistributeParallelForSimdDirective &S)
void EmitContinueStmt(const ContinueStmt &S)
Definition: CGStmt.cpp:1151
void EmitOMPTargetDirective(const OMPTargetDirective &S)
bool hasNormalCleanups() const
Determines whether there are any normal cleanups on the stack.
Definition: EHScopeStack.h:349
Stmt * getInit()
Definition: Stmt.h:2397
CXXForRangeStmt - This represents C++0x [stmt.ranged]&#39;s ranged for statement, represented as &#39;for (ra...
Definition: StmtCXX.h:134
bool IsOutlinedSEHHelper
True if the current function is an outlined SEH helper.
ABIArgInfo - Helper class to encapsulate information about how a specific C type should be passed to ...
void EmitOMPTargetUpdateDirective(const OMPTargetUpdateDirective &S)
void EmitSwitchStmt(const SwitchStmt &S)
Definition: CGStmt.cpp:1577
If a crash happens while one of these objects are live, the message is printed out along with the spe...
static void UpdateAsmCallInst(llvm::CallBase &Result, bool HasSideEffect, bool ReadOnly, bool ReadNone, const AsmStmt &S, const std::vector< llvm::Type *> &ResultRegTypes, CodeGenFunction &CGF, std::vector< llvm::Value *> &RegResults)
Definition: CGStmt.cpp:1904
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
field_iterator field_begin() const
Definition: Decl.cpp:4341
CaseStmt - Represent a case statement.
Definition: Stmt.h:1478
Expr * getCond()
Definition: Stmt.h:2416
void EmitOMPParallelDirective(const OMPParallelDirective &S)
llvm::BasicBlock * createBasicBlock(const Twine &name="", llvm::Function *parent=nullptr, llvm::BasicBlock *before=nullptr)
createBasicBlock - Create an LLVM basic block.
void EmitIgnoredExpr(const Expr *E)
EmitIgnoredExpr - Emit an expression in a context which ignores the result.
Definition: CGExpr.cpp:182
void assignRegionCounters(GlobalDecl GD, llvm::Function *Fn)
Assign counters to regions and configure them for PGO of a given function.
Definition: CodeGenPGO.cpp:759
llvm::Function * EmitCapturedStmt(const CapturedStmt &S, CapturedRegionKind K)
Generate an outlined function for the body of a CapturedStmt, store any captured variables into the c...
Definition: CGStmt.cpp:2368
void ForceCleanup(std::initializer_list< llvm::Value **> ValuesToReload={})
Force the emission of cleanups now, instead of waiting until this object is destroyed.
void EmitDefaultStmt(const DefaultStmt &S)
Definition: CGStmt.cpp:1327
static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts=false)
ContainsLabel - Return true if the statement contains a label in it.
void EmitCaseStmtRange(const CaseStmt &S)
EmitCaseStmtRange - If case statement range is not too big then add multiple cases to switch instruct...
Definition: CGStmt.cpp:1166
void incrementProfileCounter(const Stmt *S, llvm::Value *StepV=nullptr)
Increment the profiler&#39;s counter for the given statement by StepV.
uint64_t getCurrentProfileCount()
Get the profiler&#39;s current count.
Represents the body of a CapturedStmt, and serves as its DeclContext.
Definition: Decl.h:4140
VarDecl * getConditionVariable() const
Retrieve the variable declared in this "for" statement, if any.
Definition: Stmt.cpp:924
Address getAggregateAddress() const
getAggregateAddr() - Return the Value* of the address of the aggregate.
Definition: CGValue.h:70
Stmt * getBody()
Definition: Stmt.h:2089
virtual bool isValidGCCRegisterName(StringRef Name) const
Returns whether the passed in string is a valid register name according to GCC.
Definition: TargetInfo.cpp:452
Stmt * getInit()
Definition: Stmt.h:1955
LValue EmitLValueForField(LValue Base, const FieldDecl *Field)
Definition: CGExpr.cpp:3983
bool isValid() const
Definition: Address.h:35
StringRef getString() const
Definition: Expr.h:1769
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1310
void EmitOMPParallelSectionsDirective(const OMPParallelSectionsDirective &S)
const TargetCodeGenInfo & getTargetCodeGenInfo()
void EmitAnyExprToMem(const Expr *E, Address Location, Qualifiers Quals, bool IsInitializer)
EmitAnyExprToMem - Emits the code necessary to evaluate an arbitrary expression into the given memory...
Definition: CGExpr.cpp:223
RValue - This trivial value class is used to represent the result of an expression that is evaluated...
Definition: CGValue.h:38
AggValueSlot::Overlap_t getOverlapForReturnValue()
Determine whether a return value slot may overlap some other object.
bool isConstexpr() const
Definition: Stmt.h:1985
llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const
EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded integer.
std::string generateAsmString(const ASTContext &C) const
Assemble final IR asm string.
Definition: Stmt.cpp:372
Exposes information about the current target.
Definition: TargetInfo.h:161
static TypeEvaluationKind getEvaluationKind(QualType T)
getEvaluationKind - Return the TypeEvaluationKind of QualType T.
EHScopeStack::stable_iterator getScopeDepth() const
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:644
This represents one expression.
Definition: Expr.h:108
DeclStmt * getEndStmt()
Definition: StmtCXX.h:165
Emit only debug info necessary for generating line number tables (-gline-tables-only).
static Address invalid()
Definition: Address.h:34
Enters a new scope for capturing cleanups, all of which will be executed once the scope is exited...
void EmitCaseStmt(const CaseStmt &S)
Definition: CGStmt.cpp:1244
std::pair< llvm::Value *, llvm::Value * > getComplexVal() const
getComplexVal - Return the real/imag components of this complex value.
Definition: CGValue.h:65
void EmitOMPTeamsDirective(const OMPTeamsDirective &S)
#define V(N, I)
Definition: ASTContext.h:2921
Address EmitCompoundStmt(const CompoundStmt &S, bool GetLast=false, AggValueSlot AVS=AggValueSlot::ignored())
EmitCompoundStmt - Emit a compound statement {..} node.
Definition: CGStmt.cpp:371
LabelDecl * getConstantTarget()
getConstantTarget - Returns the fixed target of this indirect goto, if one exists.
Definition: Stmt.cpp:1065
Stmt * getBody()
Definition: Stmt.h:2261
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:43
void EmitSEHTryStmt(const SEHTryStmt &S)
Expr * getRHS()
Definition: Stmt.h:1579
static llvm::MDNode * getAsmSrcLocInfo(const StringLiteral *Str, CodeGenFunction &CGF)
getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline asm call instruction...
Definition: CGStmt.cpp:1877
llvm::LLVMContext & getLLVMContext()
SmallVector< llvm::OperandBundleDef, 1 > getBundlesForFunclet(llvm::Value *Callee)
Definition: CGCall.cpp:3681
llvm::BasicBlock * GetIndirectGotoBlock()
QualType getType() const
Definition: Expr.h:137
void EmitOMPMasterDirective(const OMPMasterDirective &S)
LabelDecl * getLabel() const
Definition: Stmt.h:2468
llvm::Function * GenerateCapturedStmtFunction(const CapturedStmt &S)
Creates the outlined function for a CapturedStmt.
Definition: CGStmt.cpp:2390
ReturnStmt - This represents a return, optionally of an expression: return; return 4;...
Definition: Stmt.h:2610
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T)
QualType getRecordType(const RecordDecl *Decl) const
SwitchCase * getSwitchCaseList()
Definition: Stmt.h:2146
void ResolveBranchFixups(llvm::BasicBlock *Target)
Definition: CGCleanup.cpp:378
SourceLocation getEnd() const
void EmitOMPBarrierDirective(const OMPBarrierDirective &S)
StringRef getClobber(unsigned i) const
Definition: Stmt.cpp:412
Expr * getCond()
Definition: Stmt.h:1887
ValueDecl * getDecl()
Definition: Expr.h:1222
const LangOptions & getLangOpts() const
ASTContext & getContext() const
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:708
llvm::StoreInst * CreateFlagStore(bool Value, llvm::Value *Addr)
Emit a store to an i1 flag variable.
Definition: CGBuilder.h:135
const SourceManager & SM
Definition: Format.cpp:1667
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:40
void EmitSimpleOMPExecutableDirective(const OMPExecutableDirective &D)
Emit simple code for OpenMP directives in Simd-only mode.
DoStmt - This represents a &#39;do/while&#39; stmt.
Definition: Stmt.h:2328
AsmStmt is the base class for GCCAsmStmt and MSAsmStmt.
Definition: Stmt.h:2693
void EmitDeclStmt(const DeclStmt &S)
Definition: CGStmt.cpp:1129
virtual bool hasBody() const
Returns true if this Decl represents a declaration for a body of code, such as a function or method d...
Definition: DeclBase.h:992
The l-value was considered opaque, so the alignment was determined from a type.
void EmitOMPFlushDirective(const OMPFlushDirective &S)
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy t...
bool SawAsmBlock
Whether we processed a Microsoft-style asm block during CodeGen.
Address CreateBitCast(Address Addr, llvm::Type *Ty, const llvm::Twine &Name="")
Definition: CGBuilder.h:141
void disableSanitizerForGlobal(llvm::GlobalVariable *GV)
StringRef getInputConstraint(unsigned i) const
getInputConstraint - Return the specified input constraint.
Definition: Stmt.cpp:396
This captures a statement into a function.
Definition: Stmt.h:3350
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
StringRef getOutputConstraint(unsigned i) const
getOutputConstraint - Return the constraint string for the specified output operand.
Definition: Stmt.cpp:380
Encodes a location in the source.
void EmitDoStmt(const DoStmt &S, ArrayRef< const Attr *> Attrs=None)
Definition: CGStmt.cpp:789
void EnsureInsertPoint()
EnsureInsertPoint - Ensure that an insertion point is defined so that emitted IR has a place to go...
body_range body()
Definition: Stmt.h:1343
Expr * getRetValue()
Definition: Stmt.h:2643
void EmitOMPForDirective(const OMPForDirective &S)
llvm::APSInt APSInt
A saved depth on the scope stack.
Definition: EHScopeStack.h:106
llvm::Value * EvaluateExprAsBool(const Expr *E)
EvaluateExprAsBool - Perform the usual unary conversions on the specified expression and compare the ...
Definition: CGExpr.cpp:164
Expr * getLHS()
Definition: Stmt.h:1567
void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S)
Definition: CGObjC.cpp:1622
Stmt * getElse()
Definition: Stmt.h:1908
DeclStmt - Adaptor class for mixing declarations with statements and expressions. ...
Definition: Stmt.h:1203
Represents the declaration of a label.
Definition: Decl.h:476
An aggregate value slot.
Definition: CGValue.h:436
Expr * getCond()
Definition: Stmt.h:2077
void EmitStmt(const Stmt *S, ArrayRef< const Attr *> Attrs=None)
EmitStmt - Emit the code for the statement.
Definition: CGStmt.cpp:44
void EmitOMPTaskgroupDirective(const OMPTaskgroupDirective &S)
void EmitOMPTargetParallelForSimdDirective(const OMPTargetParallelForSimdDirective &S)
bool validateOutputConstraint(ConstraintInfo &Info) const
Definition: TargetInfo.cpp:538
void EmitOMPTeamsDistributeSimdDirective(const OMPTeamsDistributeSimdDirective &S)
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1861
void EmitOMPSingleDirective(const OMPSingleDirective &S)
An aligned address.
Definition: Address.h:24
llvm::APInt APInt
Definition: Integral.h:27
void StartFunction(GlobalDecl GD, QualType RetTy, llvm::Function *Fn, const CGFunctionInfo &FnInfo, const FunctionArgList &Args, SourceLocation Loc=SourceLocation(), SourceLocation StartLoc=SourceLocation())
Emit code for the start of a function.
void EmitOMPForSimdDirective(const OMPForSimdDirective &S)
void EmitOMPAtomicDirective(const OMPAtomicDirective &S)
JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target)
The given basic block lies in the current EH scope, but may be a target of a potentially scope-crossi...
void EmitOMPSectionDirective(const OMPSectionDirective &S)
void EmitOMPSectionsDirective(const OMPSectionsDirective &S)
VarDecl * getConditionVariable()
Retrieve the variable declared in this "switch" statement, if any.
Definition: Stmt.cpp:987
void Error(SourceLocation loc, StringRef error)
Emit a general error that something can&#39;t be done.
void EmitOMPTaskLoopDirective(const OMPTaskLoopDirective &S)
const CGFunctionInfo * CurFnInfo
void EmitDecl(const Decl &D)
EmitDecl - Emit a declaration.
Definition: CGDecl.cpp:42
const TargetCodeGenInfo & getTargetHooks() const
void FinishFunction(SourceLocation EndLoc=SourceLocation())
FinishFunction - Complete IR generation of the current function.
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:221
llvm::Value * EmitScalarExpr(const Expr *E, bool IgnoreResultAssign=false)
EmitScalarExpr - Emit the computation of the specified expression of LLVM scalar type, returning the result.
void EmitWhileStmt(const WhileStmt &S, ArrayRef< const Attr *> Attrs=None)
Definition: CGStmt.cpp:701
FunctionArgList - Type for representing both the decl and type of parameters to a function...
Definition: CGCall.h:358
llvm::Value * getScalarVal() const
getScalarVal() - Return the Value* of this scalar value.
Definition: CGValue.h:58
LabelStmt * getStmt() const
Definition: Decl.h:500
llvm::CallBase * EmitCallOrInvoke(llvm::FunctionCallee Callee, ArrayRef< llvm::Value *> Args, const Twine &Name="")
Emits a call or invoke instruction to the given function, depending on the current state of the EH st...
Definition: CGCall.cpp:3749
void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S)
Definition: CGObjC.cpp:1919
void ErrorUnsupported(const Stmt *S, const char *Type)
Print out an error that codegen doesn&#39;t support the specified stmt yet.
CGFunctionInfo - Class to encapsulate the information about a function definition.
This class organizes the cross-function state that is used while generating LLVM code.
void EmitOMPTargetTeamsDirective(const OMPTargetTeamsDirective &S)
Dataflow Directional Tag Classes.
bool isVolatile() const
Definition: Stmt.h:2729
void EmitOMPTaskyieldDirective(const OMPTaskyieldDirective &S)
LValue InitCapturedStruct(const CapturedStmt &S)
Definition: CGStmt.cpp:2341
VarDecl * getConditionVariable()
Retrieve the variable declared in this "while" statement, if any.
Definition: Stmt.cpp:1043
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:580
void EmitOMPTargetParallelDirective(const OMPTargetParallelDirective &S)
void EmitOMPParallelForDirective(const OMPParallelForDirective &S)
ArrayRef< const Attr * > getAttrs() const
Definition: Stmt.h:1790
CSFC_Result
CollectStatementsForCase - Given the body of a &#39;switch&#39; statement and a constant value that is being ...
Definition: CGStmt.cpp:1368
void push(llvm::BasicBlock *Header, const llvm::DebugLoc &StartLoc, const llvm::DebugLoc &EndLoc)
Begin a new structured loop.
void EmitOMPTargetParallelForDirective(const OMPTargetParallelForDirective &S)
llvm::LoadInst * CreateLoad(Address Addr, const llvm::Twine &Name="")
Definition: CGBuilder.h:69
StmtClass getStmtClass() const
Definition: Stmt.h:1087
void EmitOMPTeamsDistributeParallelForDirective(const OMPTeamsDistributeParallelForDirective &S)
void EmitOMPCancelDirective(const OMPCancelDirective &S)
bool hasTiedOperand() const
Return true if this input operand is a matching constraint that ties it to an output operand...
Definition: TargetInfo.h:874
llvm::StoreInst * CreateStore(llvm::Value *Val, Address Addr, bool IsVolatile=false)
Definition: CGBuilder.h:107
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.h:3542
llvm::Module & getModule() const
bool toIntegralConstant(APSInt &Result, QualType SrcTy, const ASTContext &Ctx) const
Try to convert this value to an integral constant.
Definition: APValue.cpp:713
void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S)
Definition: CGObjC.cpp:1915
LValue MakeAddrLValue(Address Addr, QualType T, AlignmentSource Source=AlignmentSource::Type)
bool hasProfileClangInstr() const
Check if Clang profile instrumenation is on.
specific_decl_iterator - Iterates over a subrange of declarations stored in a DeclContext, providing only those that are of type SpecificDecl (or a class derived from it).
Definition: DeclBase.h:2048
void EmitAggExpr(const Expr *E, AggValueSlot AS)
EmitAggExpr - Emit the computation of the specified expression of aggregate type. ...
Definition: CGExprAgg.cpp:1848
void EmitCoreturnStmt(const CoreturnStmt &S)
JumpDest ReturnBlock
ReturnBlock - Unified return block.
virtual StringRef getHelperName() const
Get the name of the capture helper.
static bool hasAggregateEvaluationKind(QualType T)
SwitchStmt - This represents a &#39;switch&#39; stmt.
Definition: Stmt.h:2017
API for captured statement code generation.
static std::string SimplifyConstraint(const char *Constraint, const TargetInfo &Target, SmallVectorImpl< TargetInfo::ConstraintInfo > *OutCons=nullptr)
Definition: CGStmt.cpp:1726
void EmitBlockWithFallThrough(llvm::BasicBlock *BB, const Stmt *S)
When instrumenting to collect profile data, the counts for some blocks such as switch cases need to n...
bool resolveSymbolicName(const char *&Name, ArrayRef< ConstraintInfo > OutputConstraints, unsigned &Index) const
Definition: TargetInfo.cpp:612
llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Location)
Converts Location to a DebugLoc, if debug information is enabled.
void EmitStoreOfComplex(ComplexPairTy V, LValue dest, bool isInit)
EmitStoreOfComplex - Store a complex number into the specified l-value.
T * getAttr() const
Definition: DeclBase.h:538
void EmitAsmStmt(const AsmStmt &S)
Definition: CGStmt.cpp:1953
static std::string AddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr, const TargetInfo &Target, CodeGenModule &CGM, const AsmStmt &Stmt, const bool EarlyClobber)
AddVariableConstraints - Look at AsmExpr and if it is a variable declared as using a particular regis...
Definition: CGStmt.cpp:1779
Stmt * getInit()
Definition: Stmt.h:2098
decl_range decls()
Definition: Stmt.h:1251
void SetInternalFunctionAttributes(GlobalDecl GD, llvm::Function *F, const CGFunctionInfo &FI)
Set the attributes on the LLVM function for the given decl and function info.
const Expr * getInputExpr(unsigned i) const
Definition: Stmt.cpp:404
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:31
void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false)
EmitBlock - Emit the given block.
Definition: CGStmt.cpp:457
void EmitOMPTargetEnterDataDirective(const OMPTargetEnterDataDirective &S)
unsigned getNumClobbers() const
Definition: Stmt.h:2774
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2088
SourceManager & getSourceManager()
Definition: ASTContext.h:678
void EmitOMPDistributeSimdDirective(const OMPDistributeSimdDirective &S)
DeclStmt * getRangeStmt()
Definition: StmtCXX.h:161
void EmitStopPoint(const Stmt *S)
EmitStopPoint - Emit a debug stoppoint if we are emitting debug info.
Definition: CGStmt.cpp:34
SourceLocation getAsmLoc() const
Definition: Stmt.h:2723
GotoStmt - This represents a direct goto.
Definition: Stmt.h:2455
Expr * getTarget()
Definition: Stmt.h:2514
const SwitchCase * getNextSwitchCase() const
Definition: Stmt.h:1453
CapturedDecl * getCapturedDecl()
Retrieve the outlined function declaration.
Definition: Stmt.cpp:1291
void setCurrentStmt(const Stmt *S)
If the execution count for the current statement is known, record that as the current count...
Definition: CodeGenPGO.h:73
Expr * getCond()
Definition: Stmt.h:2346
llvm::DenseMap< const VarDecl *, llvm::Value * > NRVOFlags
A mapping from NRVO variables to the flags used to indicate when the NRVO has been applied to this va...
bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer...
VarDecl * getConditionVariable()
Retrieve the variable declared in this "if" statement, if any.
Definition: Stmt.cpp:886
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
void EmitOMPTargetTeamsDistributeDirective(const OMPTargetTeamsDistributeDirective &S)
void EmitIfStmt(const IfStmt &S)
Definition: CGStmt.cpp:624
ContinueStmt - This represents a continue.
Definition: Stmt.h:2543
void EmitBranch(llvm::BasicBlock *Block)
EmitBranch - Emit a branch to the specified basic block from the current insert block, taking care to avoid creation of branches from dummy blocks.
Definition: CGStmt.cpp:477
bool isNRVOVariable() const
Determine whether this local variable can be used with the named return value optimization (NRVO)...
Definition: Decl.h:1360
bool isVoidType() const
Definition: Type.h:6650
void EmitReturnStmt(const ReturnStmt &S)
EmitReturnStmt - Note that due to GCC extensions, this can have an operand if the function returns vo...
Definition: CGStmt.cpp:1045
llvm::Type * ConvertType(QualType T)
virtual llvm::Type * adjustInlineAsmType(CodeGen::CodeGenFunction &CGF, StringRef Constraint, llvm::Type *Ty) const
Corrects the low-level LLVM type for a given constraint and "usual" type.
Definition: TargetInfo.h:127
WhileStmt - This represents a &#39;while&#39; stmt.
Definition: Stmt.h:2200
LValue EmitLValue(const Expr *E)
EmitLValue - Emit code to compute a designator that specifies the location of the expression...
Definition: CGExpr.cpp:1243
Address ReturnValue
ReturnValue - The temporary alloca to hold the return value.
void EmitLabelStmt(const LabelStmt &S)
Definition: CGStmt.cpp:583
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:262
RValue EmitLoadOfLValue(LValue V, SourceLocation Loc)
EmitLoadOfLValue - Given an expression that represents a value lvalue, this method emits the address ...
Definition: CGExpr.cpp:1772
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1686
Defines the clang::TargetInfo interface.
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2521
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:275
virtual void addReturnRegisterOutputs(CodeGen::CodeGenFunction &CGF, CodeGen::LValue ReturnValue, std::string &Constraints, std::vector< llvm::Type *> &ResultRegTypes, std::vector< llvm::Type *> &ResultTruncRegTypes, std::vector< CodeGen::LValue > &ResultRegDests, std::string &AsmString, unsigned NumOutputs) const
Adds constraints and types for result registers.
Definition: TargetInfo.h:134
CGCapturedStmtInfo * CapturedStmtInfo
void EmitOMPTargetExitDataDirective(const OMPTargetExitDataDirective &S)
bool isEvaluatable(const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects) const
isEvaluatable - Call EvaluateAsRValue to see if this expression can be constant folded without side-e...
void EmitAggregateCopy(LValue Dest, LValue Src, QualType EltTy, AggValueSlot::Overlap_t MayOverlap, bool isVolatile=false)
EmitAggregateCopy - Emit an aggregate copy.
Definition: CGExprAgg.cpp:1911
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1146
static RValue get(llvm::Value *V)
Definition: CGValue.h:85
bool EmitSimpleStmt(const Stmt *S)
EmitSimpleStmt - Try to emit a "simple" statement which does not necessarily require an insertion poi...
Definition: CGStmt.cpp:348
BreakStmt - This represents a break.
Definition: Stmt.h:2573
void EmitOMPTargetDataDirective(const OMPTargetDataDirective &S)
CapturedRegionKind
The different kinds of captured statement.
Definition: CapturedStmt.h:16
void EmitBranchThroughCleanup(JumpDest Dest)
EmitBranchThroughCleanup - Emit a branch from the current insert block through the normal cleanup han...
Definition: CGCleanup.cpp:1044
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF)
Set the IRBuilder to not attach debug locations.
Definition: CGDebugInfo.h:759
llvm::Constant * EmitCheckSourceLocation(SourceLocation Loc)
Emit a description of a source location in a format suitable for passing to a runtime sanitizer handl...
Definition: CGExpr.cpp:2870
Stmt * getSubStmt()
Definition: Stmt.h:1731
void EmitCXXForRangeStmt(const CXXForRangeStmt &S, ArrayRef< const Attr *> Attrs=None)
Definition: CGStmt.cpp:950
Address EmitCompoundStmtWithoutScope(const CompoundStmt &S, bool GetLast=false, AggValueSlot AVS=AggValueSlot::ignored())
Definition: CGStmt.cpp:383
void EmitOMPDistributeParallelForDirective(const OMPDistributeParallelForDirective &S)
DeclStmt * getLoopVarStmt()
Definition: StmtCXX.h:168
A trivial tuple used to represent a source range.
void EmitObjCAtTryStmt(const ObjCAtTryStmt &S)
Definition: CGObjC.cpp:1911
LValue - This represents an lvalue references.
Definition: CGValue.h:166
SanitizerMetadata * getSanitizerMetadata()
void EmitBlockAfterUses(llvm::BasicBlock *BB)
EmitBlockAfterUses - Emit the given block somewhere hopefully near its uses, and leave the insertion ...
Definition: CGStmt.cpp:494
APSInt & getInt()
Definition: APValue.h:380
const LangOptions & getLangOpts() const
Expr * IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY
Skip past any parenthese and casts which do not change the value (including ptr->int casts of the sam...
Definition: Expr.cpp:2993
DeclStmt * getBeginStmt()
Definition: StmtCXX.h:162
void EmitBreakStmt(const BreakStmt &S)
Definition: CGStmt.cpp:1139
void EmitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt &S)
Definition: CGObjC.cpp:3438
static bool containsBreak(const Stmt *S)
containsBreak - Return true if the statement contains a break out of it.
SourceLocation getBegin() const
capture_init_iterator capture_init_end()
Retrieve the iterator pointing one past the last initialization argument.
Definition: Stmt.h:3534
llvm::Value * getPointer() const
Definition: CGValue.h:322
This class handles loading and caching of source files into memory.
Stmt * getSubStmt()
Definition: Stmt.h:1794
bool haveRegionCounts() const
Whether or not we have PGO region data for the current function.
Definition: CodeGenPGO.h:50
Defines enum values for all the target-independent builtin functions.
void EmitOMPTaskDirective(const OMPTaskDirective &S)
SourceLocation getBodyRBrace() const
getBodyRBrace - Gets the right brace of the body, if a body exists.
Definition: DeclBase.cpp:896
CapturedRegionKind getCapturedRegionKind() const
Retrieve the captured region kind.
Definition: Stmt.cpp:1306
bool isScalar() const
Definition: CGValue.h:51
Attr - This represents one attribute.
Definition: Attr.h:45
SourceLocation getLocation() const
Definition: DeclBase.h:429
virtual std::string convertConstraint(const char *&Constraint) const
Definition: TargetInfo.h:974
QualType getIntTypeForBitwidth(unsigned DestWidth, unsigned Signed) const
getIntTypeForBitwidth - sets integer QualTy according to specified details: bitwidth, signed/unsigned.
void EmitOMPTargetTeamsDistributeParallelForDirective(const OMPTargetTeamsDistributeParallelForDirective &S)
static OMPLinearClause * Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc, OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc, SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef< Expr *> VL, ArrayRef< Expr *> PL, ArrayRef< Expr *> IL, Expr *Step, Expr *CalcStep, Stmt *PreInit, Expr *PostUpdate)
Creates clause with a list of variables VL and a linear step Step.
virtual const char * getClobbers() const =0
Returns a string of target-specific clobbers, in LLVM format.
Stmt * getSubStmt()
Definition: Stmt.h:1597
llvm::FunctionType * GetFunctionType(const CGFunctionInfo &Info)
GetFunctionType - Get the LLVM function type for.
Definition: CGCall.cpp:1541