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      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