utils/TableGen/Types.cpp

   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 }