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 
16 using namespace llvm;
17 
18 const 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 
38 const 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