SmallVector.cpp revision 210299 
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
25  void *NewElts;
26  if (this->isSmall()) {
27    NewElts = malloc(NewCapacityInBytes);
28
29    // Copy the elements over.  No need to run dtors on PODs.
30    memcpy(NewElts, this->BeginX, CurSizeBytes);
31  } else {
32    // If this wasn't grown from the inline copy, grow the allocated space.
33    NewElts = realloc(this->BeginX, NewCapacityInBytes);
34  }
35
36  this->EndX = (char*)NewElts+CurSizeBytes;
37  this->BeginX = NewElts;
38  this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;
39}
40
41