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annotate lib/Support/SmallVector.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children afa8332a0e37
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1 //===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the SmallVector class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/ADT/SmallVector.h"
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15 using namespace llvm;
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16
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17 /// grow_pod - This is an implementation of the grow() method which only works
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18 /// on POD-like datatypes and is out of line to reduce code duplication.
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19 void SmallVectorBase::grow_pod(void *FirstEl, size_t MinSizeInBytes,
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20 size_t TSize) {
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21 size_t CurSizeBytes = size_in_bytes();
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22 size_t NewCapacityInBytes = 2 * capacity_in_bytes() + TSize; // Always grow.
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23 if (NewCapacityInBytes < MinSizeInBytes)
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24 NewCapacityInBytes = MinSizeInBytes;
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25
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26 void *NewElts;
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27 if (BeginX == FirstEl) {
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28 NewElts = malloc(NewCapacityInBytes);
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29
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30 // Copy the elements over. No need to run dtors on PODs.
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31 memcpy(NewElts, this->BeginX, CurSizeBytes);
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32 } else {
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33 // If this wasn't grown from the inline copy, grow the allocated space.
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34 NewElts = realloc(this->BeginX, NewCapacityInBytes);
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35 }
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36
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37 this->EndX = (char*)NewElts+CurSizeBytes;
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38 this->BeginX = NewElts;
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39 this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;
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40 }