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Rangify for loops in GlobalDCE, NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242619 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -92,33 +92,28 @@ bool GlobalDCE::runOnModule(Module &M) {
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ComdatMembers.insert(std::make_pair(C, &GA));
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ComdatMembers.insert(std::make_pair(C, &GA));
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// Loop over the module, adding globals which are obviously necessary.
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// Loop over the module, adding globals which are obviously necessary.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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for (Function &F : M) {
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Changed |= RemoveUnusedGlobalValue(*I);
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Changed |= RemoveUnusedGlobalValue(F);
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// Functions with external linkage are needed if they have a body
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// Functions with external linkage are needed if they have a body
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if (!I->isDeclaration() && !I->hasAvailableExternallyLinkage()) {
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if (!F.isDeclaration() && !F.hasAvailableExternallyLinkage())
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if (!I->isDiscardableIfUnused())
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if (!F.isDiscardableIfUnused())
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GlobalIsNeeded(I);
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GlobalIsNeeded(&F);
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}
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}
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}
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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for (GlobalVariable &GV : M.globals()) {
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I != E; ++I) {
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Changed |= RemoveUnusedGlobalValue(GV);
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Changed |= RemoveUnusedGlobalValue(*I);
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// Externally visible & appending globals are needed, if they have an
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// Externally visible & appending globals are needed, if they have an
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// initializer.
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// initializer.
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if (!I->isDeclaration() && !I->hasAvailableExternallyLinkage()) {
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if (!GV.isDeclaration() && !GV.hasAvailableExternallyLinkage())
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if (!I->isDiscardableIfUnused())
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if (!GV.isDiscardableIfUnused())
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GlobalIsNeeded(I);
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GlobalIsNeeded(&GV);
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}
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}
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}
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for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end();
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for (GlobalAlias &GA : M.aliases()) {
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I != E; ++I) {
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Changed |= RemoveUnusedGlobalValue(GA);
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Changed |= RemoveUnusedGlobalValue(*I);
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// Externally visible aliases are needed.
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// Externally visible aliases are needed.
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if (!I->isDiscardableIfUnused()) {
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if (!GA.isDiscardableIfUnused())
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GlobalIsNeeded(I);
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GlobalIsNeeded(&GA);
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}
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}
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}
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// Now that all globals which are needed are in the AliveGlobals set, we loop
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// Now that all globals which are needed are in the AliveGlobals set, we loop
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@ -126,52 +121,50 @@ bool GlobalDCE::runOnModule(Module &M) {
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//
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//
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// The first pass is to drop initializers of global variables which are dead.
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// The first pass is to drop initializers of global variables which are dead.
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std::vector<GlobalVariable*> DeadGlobalVars; // Keep track of dead globals
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std::vector<GlobalVariable *> DeadGlobalVars; // Keep track of dead globals
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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for (GlobalVariable &GV : M.globals())
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I != E; ++I)
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if (!AliveGlobals.count(&GV)) {
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if (!AliveGlobals.count(I)) {
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DeadGlobalVars.push_back(&GV); // Keep track of dead globals
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DeadGlobalVars.push_back(I); // Keep track of dead globals
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if (GV.hasInitializer()) {
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if (I->hasInitializer()) {
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Constant *Init = GV.getInitializer();
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Constant *Init = I->getInitializer();
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GV.setInitializer(nullptr);
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I->setInitializer(nullptr);
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if (isSafeToDestroyConstant(Init))
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if (isSafeToDestroyConstant(Init))
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Init->destroyConstant();
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Init->destroyConstant();
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}
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}
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}
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}
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// The second pass drops the bodies of functions which are dead...
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// The second pass drops the bodies of functions which are dead...
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std::vector<Function*> DeadFunctions;
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std::vector<Function *> DeadFunctions;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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for (Function &F : M)
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if (!AliveGlobals.count(I)) {
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if (!AliveGlobals.count(&F)) {
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DeadFunctions.push_back(I); // Keep track of dead globals
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DeadFunctions.push_back(&F); // Keep track of dead globals
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if (!I->isDeclaration())
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if (!F.isDeclaration())
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I->deleteBody();
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F.deleteBody();
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}
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}
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// The third pass drops targets of aliases which are dead...
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// The third pass drops targets of aliases which are dead...
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std::vector<GlobalAlias*> DeadAliases;
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std::vector<GlobalAlias*> DeadAliases;
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for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end(); I != E;
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for (GlobalAlias &GA : M.aliases())
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++I)
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if (!AliveGlobals.count(&GA)) {
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if (!AliveGlobals.count(I)) {
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DeadAliases.push_back(&GA);
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DeadAliases.push_back(I);
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GA.setAliasee(nullptr);
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I->setAliasee(nullptr);
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}
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}
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if (!DeadFunctions.empty()) {
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if (!DeadFunctions.empty()) {
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// Now that all interferences have been dropped, delete the actual objects
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// Now that all interferences have been dropped, delete the actual objects
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// themselves.
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// themselves.
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for (unsigned i = 0, e = DeadFunctions.size(); i != e; ++i) {
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for (Function *F : DeadFunctions) {
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RemoveUnusedGlobalValue(*DeadFunctions[i]);
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RemoveUnusedGlobalValue(*F);
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M.getFunctionList().erase(DeadFunctions[i]);
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M.getFunctionList().erase(F);
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}
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}
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NumFunctions += DeadFunctions.size();
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NumFunctions += DeadFunctions.size();
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Changed = true;
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Changed = true;
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}
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}
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if (!DeadGlobalVars.empty()) {
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if (!DeadGlobalVars.empty()) {
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for (unsigned i = 0, e = DeadGlobalVars.size(); i != e; ++i) {
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for (GlobalVariable *GV : DeadGlobalVars) {
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RemoveUnusedGlobalValue(*DeadGlobalVars[i]);
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RemoveUnusedGlobalValue(*GV);
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M.getGlobalList().erase(DeadGlobalVars[i]);
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M.getGlobalList().erase(GV);
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}
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}
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NumVariables += DeadGlobalVars.size();
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NumVariables += DeadGlobalVars.size();
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Changed = true;
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Changed = true;
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@ -179,9 +172,9 @@ bool GlobalDCE::runOnModule(Module &M) {
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// Now delete any dead aliases.
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// Now delete any dead aliases.
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if (!DeadAliases.empty()) {
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if (!DeadAliases.empty()) {
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for (unsigned i = 0, e = DeadAliases.size(); i != e; ++i) {
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for (GlobalAlias *GA : DeadAliases) {
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RemoveUnusedGlobalValue(*DeadAliases[i]);
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RemoveUnusedGlobalValue(*GA);
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M.getAliasList().erase(DeadAliases[i]);
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M.getAliasList().erase(GA);
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}
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}
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NumAliases += DeadAliases.size();
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NumAliases += DeadAliases.size();
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Changed = true;
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Changed = true;
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@ -231,12 +224,12 @@ void GlobalDCE::GlobalIsNeeded(GlobalValue *G) {
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if (F->hasPersonalityFn())
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if (F->hasPersonalityFn())
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MarkUsedGlobalsAsNeeded(F->getPersonalityFn());
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MarkUsedGlobalsAsNeeded(F->getPersonalityFn());
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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for (BasicBlock &BB : *F)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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for (Instruction &I : BB)
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for (User::op_iterator U = I->op_begin(), E = I->op_end(); U != E; ++U)
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for (Use &U : I.operands())
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if (GlobalValue *GV = dyn_cast<GlobalValue>(*U))
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if (GlobalValue *GV = dyn_cast<GlobalValue>(U))
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GlobalIsNeeded(GV);
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GlobalIsNeeded(GV);
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else if (Constant *C = dyn_cast<Constant>(*U))
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else if (Constant *C = dyn_cast<Constant>(U))
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MarkUsedGlobalsAsNeeded(C);
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MarkUsedGlobalsAsNeeded(C);
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}
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}
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}
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}
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@ -247,9 +240,9 @@ void GlobalDCE::MarkUsedGlobalsAsNeeded(Constant *C) {
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// Loop over all of the operands of the constant, adding any globals they
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// Loop over all of the operands of the constant, adding any globals they
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// use to the list of needed globals.
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// use to the list of needed globals.
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for (User::op_iterator I = C->op_begin(), E = C->op_end(); I != E; ++I) {
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for (Use &U : C->operands()) {
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// If we've already processed this constant there's no need to do it again.
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// If we've already processed this constant there's no need to do it again.
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Constant *Op = dyn_cast<Constant>(*I);
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Constant *Op = dyn_cast<Constant>(U);
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if (Op && SeenConstants.insert(Op).second)
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if (Op && SeenConstants.insert(Op).second)
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MarkUsedGlobalsAsNeeded(Op);
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MarkUsedGlobalsAsNeeded(Op);
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}
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}
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@ -262,7 +255,8 @@ void GlobalDCE::MarkUsedGlobalsAsNeeded(Constant *C) {
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// might make it deader.
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// might make it deader.
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//
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//
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bool GlobalDCE::RemoveUnusedGlobalValue(GlobalValue &GV) {
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bool GlobalDCE::RemoveUnusedGlobalValue(GlobalValue &GV) {
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if (GV.use_empty()) return false;
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if (GV.use_empty())
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return false;
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GV.removeDeadConstantUsers();
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GV.removeDeadConstantUsers();
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return GV.use_empty();
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return GV.use_empty();
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}
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}
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