llvm/utils/TableGen/Common/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 *
  19 llvm::getMinimalTypeForRange(uint64_t Range,
  20                              unsigned MaxSize LLVM_ATTRIBUTE_UNUSED) {
  21   // TODO: The original callers only used 32 and 64 so these are the only
  22   //       values permitted. Rather than widen the supported values we should
  23   //       allow 64 for the callers that currently use 32 and remove the
  24   //       argument altogether.
  25   assert((MaxSize == 32 || MaxSize == 64) && "Unexpected size");
  26   assert(MaxSize <= 64 && "Unexpected size");
  27   assert(((MaxSize > 32) ? Range <= 0xFFFFFFFFFFFFFFFFULL
  28                          : Range <= 0xFFFFFFFFULL) &&
  29          "Enum too large");
  30
  31   if (Range > 0xFFFFFFFFULL)
  32     return "uint64_t";
  33   if (Range > 0xFFFF)
  34     return "uint32_t";
  35   if (Range > 0xFF)
  36     return "uint16_t";
  37   return "uint8_t";
  38 }