mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-01 05:01:59 +01:00
c5c96d69c8
Representing size and capacity directly as unsigned and calculate `end()` using `begin() + size()`. This limits the maximum size/capacity of a vector to UINT32_MAX. https://reviews.llvm.org/D48518 llvm-svn: 337504
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the SmallVector class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/SmallVector.h"
|
|
using namespace llvm;
|
|
|
|
// Check that no bytes are wasted.
|
|
static_assert(sizeof(SmallVector<void *, 1>) ==
|
|
sizeof(unsigned) * 2 + sizeof(void *) * 2,
|
|
"wasted space in SmallVector size 1; missing EBO?");
|
|
|
|
/// grow_pod - This is an implementation of the grow() method which only works
|
|
/// on POD-like datatypes and is out of line to reduce code duplication.
|
|
void SmallVectorBase::grow_pod(void *FirstEl, size_t MinCapacity,
|
|
size_t TSize) {
|
|
// Ensure we can fit the new capacity in 32 bits.
|
|
if (MinCapacity > UINT32_MAX)
|
|
report_bad_alloc_error("SmallVector capacity overflow during allocation");
|
|
|
|
size_t NewCapacity = 2 * capacity() + 1; // Always grow.
|
|
NewCapacity =
|
|
std::min(std::max(NewCapacity, MinCapacity), size_t(UINT32_MAX));
|
|
|
|
void *NewElts;
|
|
if (BeginX == FirstEl) {
|
|
NewElts = safe_malloc(NewCapacity * TSize);
|
|
|
|
// Copy the elements over. No need to run dtors on PODs.
|
|
memcpy(NewElts, this->BeginX, size() * TSize);
|
|
} else {
|
|
// If this wasn't grown from the inline copy, grow the allocated space.
|
|
NewElts = safe_realloc(this->BeginX, NewCapacity * TSize);
|
|
}
|
|
|
|
this->BeginX = NewElts;
|
|
this->Capacity = NewCapacity;
|
|
}
|