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annotate lib/IR/Operator.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
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children 7d135dc70f03
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95
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1 #include "llvm/IR/Operator.h"
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2 #include "llvm/IR/GetElementPtrTypeIterator.h"
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3 #include "llvm/IR/Instructions.h"
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4 #include "llvm/IR/Type.h"
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5
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6 #include "ConstantsContext.h"
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7
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8 namespace llvm {
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9 Type *GEPOperator::getSourceElementType() const {
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10 if (auto *I = dyn_cast<GetElementPtrInst>(this))
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11 return I->getSourceElementType();
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12 return cast<GetElementPtrConstantExpr>(this)->getSourceElementType();
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13 }
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14
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15 bool GEPOperator::accumulateConstantOffset(const DataLayout &DL,
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16 APInt &Offset) const {
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17 assert(Offset.getBitWidth() ==
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18 DL.getPointerSizeInBits(getPointerAddressSpace()) &&
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19 "The offset must have exactly as many bits as our pointer.");
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20
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21 for (gep_type_iterator GTI = gep_type_begin(this), GTE = gep_type_end(this);
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22 GTI != GTE; ++GTI) {
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23 ConstantInt *OpC = dyn_cast<ConstantInt>(GTI.getOperand());
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24 if (!OpC)
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25 return false;
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26 if (OpC->isZero())
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27 continue;
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28
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29 // Handle a struct index, which adds its field offset to the pointer.
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30 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
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31 unsigned ElementIdx = OpC->getZExtValue();
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32 const StructLayout *SL = DL.getStructLayout(STy);
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33 Offset += APInt(Offset.getBitWidth(), SL->getElementOffset(ElementIdx));
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34 continue;
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35 }
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36
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37 // For array or vector indices, scale the index by the size of the type.
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38 APInt Index = OpC->getValue().sextOrTrunc(Offset.getBitWidth());
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39 Offset += Index * APInt(Offset.getBitWidth(),
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40 DL.getTypeAllocSize(GTI.getIndexedType()));
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41 }
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42 return true;
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43 }
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44 }