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d164d3d9e7
realloc implementation can try to expand the allocated memory block in-place, avoiding the copy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105605 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
//===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SmallVector class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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/// grow_pod - This is an implementation of the grow() method which only works
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/// on POD-like datatypes and is out of line to reduce code duplication.
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void SmallVectorBase::grow_pod(size_t MinSizeInBytes, size_t TSize) {
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size_t CurSizeBytes = size_in_bytes();
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size_t NewCapacityInBytes = 2 * capacity_in_bytes();
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if (NewCapacityInBytes < MinSizeInBytes)
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NewCapacityInBytes = MinSizeInBytes;
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void *NewElts;
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if (this->isSmall()) {
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NewElts = malloc(NewCapacityInBytes);
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// Copy the elements over. No need to run dtors on PODs.
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memcpy(NewElts, this->BeginX, CurSizeBytes);
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} else {
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// If this wasn't grown from the inline copy, grow the allocated space.
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NewElts = realloc(this->BeginX, NewCapacityInBytes);
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}
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this->EndX = (char*)NewElts+CurSizeBytes;
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this->BeginX = NewElts;
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this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;
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}
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