YAML.cpp revision 360784 
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
20using namespace llvm;
21
22void yaml::ScalarTraits<yaml::BinaryRef>::output(
23    const yaml::BinaryRef &Val, void *, raw_ostream &Out) {
24  Val.writeAsHex(Out);
25}
26
27StringRef 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
40void 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
55void 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}
65