llvm/lib/ObjectYAML/YAML.cpp

   1 //===- YAML.cpp - YAMLIO utilities for object files -----------------------===//
   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 // This file defines utility classes for handling the YAML representation of
  10 // object files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ObjectYAML/YAML.h"
  15 #include "llvm/ADT/StringExtras.h"
  16 #include "llvm/Support/raw_ostream.h"
  17 #include <cctype>
  18 #include <cstdint>
  19
  20 using namespace llvm;
  21
  22 void yaml::ScalarTraits<yaml::BinaryRef>::output(
  23     const yaml::BinaryRef &Val, void *, raw_ostream &Out) {
  24   Val.writeAsHex(Out);
  25 }
  26
  27 StringRef yaml::ScalarTraits<yaml::BinaryRef>::input(StringRef Scalar, void *,
  28                                                      yaml::BinaryRef &Val) {
  29   if (Scalar.size() % 2 != 0)
  30     return "BinaryRef hex string must contain an even number of nybbles.";
  31   // TODO: Can we improve YAMLIO to permit a more accurate diagnostic here?
  32   // (e.g. a caret pointing to the offending character).
  33   for (unsigned I = 0, N = Scalar.size(); I != N; ++I)
  34     if (!llvm::isHexDigit(Scalar[I]))
  35       return "BinaryRef hex string must contain only hex digits.";
  36   Val = yaml::BinaryRef(Scalar);
  37   return {};
  38 }
  39
  40 void yaml::BinaryRef::writeAsBinary(raw_ostream &OS, uint64_t N) const {
  41   if (!DataIsHexString) {
  42     OS.write((const char *)Data.data(), std::min<uint64_t>(N, Data.size()));
  43     return;
  44   }
  45
  46   for (uint64_t I = 0, E = std::min<uint64_t>(N, Data.size() / 2); I != E;
  47        ++I) {
  48     uint8_t Byte = llvm::hexDigitValue(Data[I * 2]);
  49     Byte <<= 4;
  50     Byte |= llvm::hexDigitValue(Data[I * 2 + 1]);
  51     OS.write(Byte);
  52   }
  53 }
  54
  55 void yaml::BinaryRef::writeAsHex(raw_ostream &OS) const {
  56   if (binary_size() == 0)
  57     return;
  58   if (DataIsHexString) {
  59     OS.write((const char *)Data.data(), Data.size());
  60     return;
  61   }
  62   for (uint8_t Byte : Data)
  63     OS << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf);
  64 }