1//===- Types.cpp - Helper for the selection of C++ data types. ------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "Types.h"
10
11// For LLVM_ATTRIBUTE_UNUSED
12#include "llvm/Support/Compiler.h"
13
14#include <cassert>
15
16using namespace llvm;
17
18const char *llvm::getMinimalTypeForRange(uint64_t Range, unsigned MaxSize LLVM_ATTRIBUTE_UNUSED) {
19  // TODO: The original callers only used 32 and 64 so these are the only
20  //       values permitted. Rather than widen the supported values we should
21  //       allow 64 for the callers that currently use 32 and remove the
22  //       argument altogether.
23  assert((MaxSize == 32 || MaxSize == 64) && "Unexpected size");
24  assert(MaxSize <= 64 && "Unexpected size");
25  assert(((MaxSize > 32) ? Range <= 0xFFFFFFFFFFFFFFFFULL
26                         : Range <= 0xFFFFFFFFULL) &&
27         "Enum too large");
28
29  if (Range > 0xFFFFFFFFULL)
30    return "uint64_t";
31  if (Range > 0xFFFF)
32    return "uint32_t";
33  if (Range > 0xFF)
34    return "uint16_t";
35  return "uint8_t";
36}
37
38const char *llvm::getMinimalTypeForEnumBitfield(uint64_t Size) {
39  uint64_t MaxIndex = Size;
40  if (MaxIndex > 0)
41    MaxIndex--;
42  assert(MaxIndex <= 64 && "Too many bits");
43  return getMinimalTypeForRange(1ULL << MaxIndex);
44}
45