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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
//===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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// Check that no bytes are wasted and everything is well-aligned.
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namespace {
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struct Struct16B {
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alignas(16) void *X;
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};
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struct Struct32B {
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alignas(32) void *X;
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};
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}
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static_assert(sizeof(SmallVector<void *, 0>) ==
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sizeof(unsigned) * 2 + sizeof(void *),
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"wasted space in SmallVector size 0");
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static_assert(alignof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
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"wrong alignment for 16-byte aligned T");
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static_assert(alignof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
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"wrong alignment for 32-byte aligned T");
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static_assert(sizeof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
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"missing padding for 16-byte aligned T");
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static_assert(sizeof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
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"missing padding for 32-byte aligned T");
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static_assert(sizeof(SmallVector<void *, 1>) ==
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sizeof(unsigned) * 2 + sizeof(void *) * 2,
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"wasted space in SmallVector size 1");
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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(void *FirstEl, size_t MinCapacity,
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size_t TSize) {
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// Ensure we can fit the new capacity in 32 bits.
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if (MinCapacity > UINT32_MAX)
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report_bad_alloc_error("SmallVector capacity overflow during allocation");
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size_t NewCapacity = 2 * capacity() + 1; // Always grow.
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NewCapacity =
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std::min(std::max(NewCapacity, MinCapacity), size_t(UINT32_MAX));
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void *NewElts;
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if (BeginX == FirstEl) {
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NewElts = safe_malloc(NewCapacity * TSize);
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// Copy the elements over. No need to run dtors on PODs.
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memcpy(NewElts, this->BeginX, size() * TSize);
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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 = safe_realloc(this->BeginX, NewCapacity * TSize);
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}
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this->BeginX = NewElts;
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this->Capacity = NewCapacity;
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}
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