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Side by Side Diff: lib/Transforms/NaCl/FlattenGlobals.cpp

Issue 828553007: Wrok around MSVC bug 1085387. (Closed) Base URL: https://chromium.googlesource.com/native_client/pnacl-llvm.git@master
Patch Set: Created 5 years, 11 months ago
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1 //===- FlattenGlobals.cpp - Flatten global variable initializers-----------===// 1 //===- FlattenGlobals.cpp - Flatten global variable initializers-----------===//
2 // 2 //
3 // The LLVM Compiler Infrastructure 3 // The LLVM Compiler Infrastructure
4 // 4 //
5 // This file is distributed under the University of Illinois Open Source 5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details. 6 // License. See LICENSE.TXT for details.
7 // 7 //
8 //===----------------------------------------------------------------------===// 8 //===----------------------------------------------------------------------===//
9 // 9 //
10 // This pass converts initializers for global variables into a 10 // This pass converts initializers for global variables into a
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75 75
76 // Define map from a relocation, appearing in the flattened global variable 76 // Define map from a relocation, appearing in the flattened global variable
77 // initializers, to it's corresponding use handle. 77 // initializers, to it's corresponding use handle.
78 typedef DenseMap<Constant*, RelocUserType*> RelocMapType; 78 typedef DenseMap<Constant*, RelocUserType*> RelocMapType;
79 79
80 // Define the list to hold the list of global variables being flattened. 80 // Define the list to hold the list of global variables being flattened.
81 struct FlattenedGlobal; 81 struct FlattenedGlobal;
82 typedef std::vector<FlattenedGlobal*> FlattenedGlobalsVectorType; 82 typedef std::vector<FlattenedGlobal*> FlattenedGlobalsVectorType;
83 83
84 // Returns the corresponding relocation, for the given user handle. 84 // Returns the corresponding relocation, for the given user handle.
85 static Constant *getRelocUse(RelocUserType *RelocUser) { 85 Constant *getRelocUseConstant(RelocUserType *RelocUser) {
86 return cast<Constant>(RelocUser->getReturnValue()); 86 return cast<Constant>(RelocUser->getReturnValue());
87 } 87 }
88 88
89 // The state associated with flattening globals of a module. 89 // The state associated with flattening globals of a module.
90 struct FlattenGlobalsState { 90 struct FlattenGlobalsState {
91 /// The module being flattened. 91 /// The module being flattened.
92 Module &M; 92 Module &M;
93 /// The data layout to be used. 93 /// The data layout to be used.
94 DataLayout DL; 94 DataLayout DL;
95 /// The relocations (within the original global variable initializers) 95 /// The relocations (within the original global variable initializers)
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168 uint8_t *BufEnd; 168 uint8_t *BufEnd;
169 169
170 // 2) an array of relocations. 170 // 2) an array of relocations.
171 class Reloc { 171 class Reloc {
172 private: 172 private:
173 unsigned RelOffset; // Offset at which the relocation is to be applied. 173 unsigned RelOffset; // Offset at which the relocation is to be applied.
174 RelocUserType *RelocUser; 174 RelocUserType *RelocUser;
175 public: 175 public:
176 176
177 unsigned getRelOffset() const { return RelOffset; } 177 unsigned getRelOffset() const { return RelOffset; }
178 Constant *getRelocUse() const { return ::getRelocUse(RelocUser); } 178 Constant *getRelocUse() const { return ::getRelocUseConstant(RelocUser); }
179 Reloc(FlattenGlobalsState &State, unsigned RelOffset, Constant *NewVal) 179 Reloc(FlattenGlobalsState &State, unsigned RelOffset, Constant *NewVal)
180 : RelOffset(RelOffset), 180 : RelOffset(RelOffset), RelocUser(State.getRelocUserHandle(NewVal)) {}
181 RelocUser(State.getRelocUserHandle(NewVal)) {}
182 181
183 explicit Reloc(const Reloc &R) 182 explicit Reloc(const Reloc &R)
184 : RelOffset(R.RelOffset), RelocUser(R.RelocUser) {} 183 : RelOffset(R.RelOffset), RelocUser(R.RelocUser) {}
185 184
186 void operator=(const Reloc &R) { 185 void operator=(const Reloc &R) {
187 RelOffset = R.RelOffset; 186 RelOffset = R.RelOffset;
188 RelocUser = R.RelocUser; 187 RelocUser = R.RelocUser;
189 } 188 }
190 }; 189 };
191 typedef SmallVector<Reloc, 10> RelocArray; 190 typedef SmallVector<Reloc, 10> RelocArray;
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505 void FlattenGlobalsState::removeDeadInitializerConstants() { 504 void FlattenGlobalsState::removeDeadInitializerConstants() {
506 // Detach original initializers. 505 // Detach original initializers.
507 for (FlattenedGlobalsVectorType::iterator 506 for (FlattenedGlobalsVectorType::iterator
508 I = FlattenedGlobalsVector.begin(), E = FlattenedGlobalsVector.end(); 507 I = FlattenedGlobalsVector.begin(), E = FlattenedGlobalsVector.end();
509 I != E; ++I) { 508 I != E; ++I) {
510 (*I)->removeOriginalInitializer(); 509 (*I)->removeOriginalInitializer();
511 } 510 }
512 // Do cleanup of old initializers. 511 // Do cleanup of old initializers.
513 for (RelocMapType::iterator I = RelocMap.begin(), E = RelocMap.end(); 512 for (RelocMapType::iterator I = RelocMap.begin(), E = RelocMap.end();
514 I != E; ++I) { 513 I != E; ++I) {
515 getRelocUse(I->second)->removeDeadConstantUsers(); 514 getRelocUseConstant(I->second)->removeDeadConstantUsers();
516 } 515 }
517 516
518 } 517 }
519 518
520 void FlattenGlobalsState::replaceGlobalsWithFlattenedGlobals() { 519 void FlattenGlobalsState::replaceGlobalsWithFlattenedGlobals() {
521 for (FlattenedGlobalsVectorType::iterator 520 for (FlattenedGlobalsVectorType::iterator
522 I = FlattenedGlobalsVector.begin(), E = FlattenedGlobalsVector.end(); 521 I = FlattenedGlobalsVector.begin(), E = FlattenedGlobalsVector.end();
523 I != E; ++I) { 522 I != E; ++I) {
524 (*I)->replaceGlobalWithFlattenedGlobal(); 523 (*I)->replaceGlobalWithFlattenedGlobal();
525 } 524 }
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538 State.flattenGlobalsWithInitializers(); 537 State.flattenGlobalsWithInitializers();
539 State.removeDeadInitializerConstants(); 538 State.removeDeadInitializerConstants();
540 State.replaceGlobalsWithFlattenedGlobals(); 539 State.replaceGlobalsWithFlattenedGlobals();
541 State.installFlattenedGlobalInitializers(); 540 State.installFlattenedGlobalInitializers();
542 return State.Modified; 541 return State.Modified;
543 } 542 }
544 543
545 ModulePass *llvm::createFlattenGlobalsPass() { 544 ModulePass *llvm::createFlattenGlobalsPass() {
546 return new FlattenGlobals(); 545 return new FlattenGlobals();
547 } 546 }
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