SmallVector.cpp revision 208954 
1//===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the SmallVector class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/ADT/SmallVector.h"
15using namespace llvm;
16
17/// grow_pod - This is an implementation of the grow() method which only works
18/// on POD-like datatypes and is out of line to reduce code duplication.
19void SmallVectorBase::grow_pod(size_t MinSizeInBytes, size_t TSize) {
20  size_t CurSizeBytes = size_in_bytes();
21  size_t NewCapacityInBytes = 2 * capacity_in_bytes();
22  if (NewCapacityInBytes < MinSizeInBytes)
23    NewCapacityInBytes = MinSizeInBytes;
24  void *NewElts = operator new(NewCapacityInBytes);
25
26  // Copy the elements over.  No need to run dtors on PODs.
27  memcpy(NewElts, this->BeginX, CurSizeBytes);
28
29  // If this wasn't grown from the inline copy, deallocate the old space.
30  if (!this->isSmall())
31    operator delete(this->BeginX);
32
33  this->EndX = (char*)NewElts+CurSizeBytes;
34  this->BeginX = NewElts;
35  this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;
36}
37
38