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replace a linear scan with a symtab lookup, reduce indentation.
No functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121042 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1930,47 +1930,47 @@ bool GlobalOpt::OptimizeGlobalVars(Module &M) {
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/// FindGlobalCtors - Find the llvm.globalctors list, verifying that all
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/// initializers have an init priority of 65535.
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GlobalVariable *GlobalOpt::FindGlobalCtors(Module &M) {
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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if (I->getName() == "llvm.global_ctors") {
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// Found it, verify it's an array of { int, void()* }.
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const ArrayType *ATy =dyn_cast<ArrayType>(I->getType()->getElementType());
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if (!ATy) return 0;
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const StructType *STy = dyn_cast<StructType>(ATy->getElementType());
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if (!STy || STy->getNumElements() != 2 ||
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!STy->getElementType(0)->isIntegerTy(32)) return 0;
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const PointerType *PFTy = dyn_cast<PointerType>(STy->getElementType(1));
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if (!PFTy) return 0;
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const FunctionType *FTy = dyn_cast<FunctionType>(PFTy->getElementType());
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if (!FTy || !FTy->getReturnType()->isVoidTy() ||
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FTy->isVarArg() || FTy->getNumParams() != 0)
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return 0;
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GlobalVariable *GV = M.getGlobalVariable("llvm.global_ctors");
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if (GV == 0) return 0;
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// Found it, verify it's an array of { int, void()* }.
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const ArrayType *ATy =dyn_cast<ArrayType>(GV->getType()->getElementType());
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if (!ATy) return 0;
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const StructType *STy = dyn_cast<StructType>(ATy->getElementType());
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if (!STy || STy->getNumElements() != 2 ||
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!STy->getElementType(0)->isIntegerTy(32)) return 0;
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const PointerType *PFTy = dyn_cast<PointerType>(STy->getElementType(1));
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if (!PFTy) return 0;
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const FunctionType *FTy = dyn_cast<FunctionType>(PFTy->getElementType());
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if (!FTy || !FTy->getReturnType()->isVoidTy() ||
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FTy->isVarArg() || FTy->getNumParams() != 0)
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return 0;
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// Verify that the initializer is simple enough for us to handle. We are
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// only allowed to optimize the initializer if it is unique.
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if (!I->hasUniqueInitializer()) return 0;
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ConstantArray *CA = dyn_cast<ConstantArray>(I->getInitializer());
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if (!CA) return 0;
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for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i)
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(*i)) {
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if (isa<ConstantPointerNull>(CS->getOperand(1)))
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continue;
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// Verify that the initializer is simple enough for us to handle. We are
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// only allowed to optimize the initializer if it is unique.
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if (!GV->hasUniqueInitializer()) return 0;
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ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
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if (!CA) return 0;
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for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i) {
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ConstantStruct *CS = dyn_cast<ConstantStruct>(*i);
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if (CS == 0) return 0;
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if (isa<ConstantPointerNull>(CS->getOperand(1)))
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continue;
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// Must have a function or null ptr.
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if (!isa<Function>(CS->getOperand(1)))
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return 0;
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// Must have a function or null ptr.
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if (!isa<Function>(CS->getOperand(1)))
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return 0;
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// Init priority must be standard.
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ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
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if (!CI || CI->getZExtValue() != 65535)
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return 0;
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} else {
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return 0;
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}
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// Init priority must be standard.
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ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
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if (!CI || CI->getZExtValue() != 65535)
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return 0;
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}
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return I;
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}
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return 0;
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return GV;
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}
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/// ParseGlobalCtors - Given a llvm.global_ctors list that we can understand,
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