1 //===- DXContainerEmitter.cpp - Convert YAML to a DXContainer -------------===//
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 /// \file
10 /// Binary emitter for yaml to DXContainer binary
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/BinaryFormat/DXContainer.h"
15 #include "llvm/ObjectYAML/ObjectYAML.h"
16 #include "llvm/ObjectYAML/yaml2obj.h"
17 #include "llvm/Support/Errc.h"
18 #include "llvm/Support/Error.h"
19 #include "llvm/Support/raw_ostream.h"
20 
21 using namespace llvm;
22 
23 namespace {
24 class DXContainerWriter {
25 public:
26   DXContainerWriter(DXContainerYAML::Object &ObjectFile)
27       : ObjectFile(ObjectFile) {}
28 
29   Error write(raw_ostream &OS);
30 
31 private:
32   DXContainerYAML::Object &ObjectFile;
33 
34   Error computePartOffsets();
35   Error validatePartOffsets();
36   Error validateSize(uint32_t Computed);
37 
38   void writeHeader(raw_ostream &OS);
39   void writeParts(raw_ostream &OS);
40 };
41 } // namespace
42 
43 Error DXContainerWriter::validateSize(uint32_t Computed) {
44   if (!ObjectFile.Header.FileSize)
45     ObjectFile.Header.FileSize = Computed;
46   else if (*ObjectFile.Header.FileSize < Computed)
47     return createStringError(errc::result_out_of_range,
48                              "File size specified is too small.");
49   return Error::success();
50 }
51 
52 Error DXContainerWriter::validatePartOffsets() {
53   if (ObjectFile.Parts.size() != ObjectFile.Header.PartOffsets->size())
54     return createStringError(
55         errc::invalid_argument,
56         "Mismatch between number of parts and part offsets.");
57   uint32_t RollingOffset =
58       sizeof(dxbc::Header) + (ObjectFile.Header.PartCount * sizeof(uint32_t));
59   for (auto I : llvm::zip(ObjectFile.Parts, *ObjectFile.Header.PartOffsets)) {
60     if (RollingOffset > std::get<1>(I))
61       return createStringError(errc::invalid_argument,
62                                "Offset mismatch, not enough space for data.");
63     RollingOffset =
64         std::get<1>(I) + sizeof(dxbc::PartHeader) + std::get<0>(I).Size;
65   }
66   if (Error Err = validateSize(RollingOffset))
67     return Err;
68 
69   return Error::success();
70 }
71 
72 Error DXContainerWriter::computePartOffsets() {
73   if (ObjectFile.Header.PartOffsets)
74     return validatePartOffsets();
75   uint32_t RollingOffset =
76       sizeof(dxbc::Header) + (ObjectFile.Header.PartCount * sizeof(uint32_t));
77   ObjectFile.Header.PartOffsets = std::vector<uint32_t>();
78   for (const auto &Part : ObjectFile.Parts) {
79     ObjectFile.Header.PartOffsets->push_back(RollingOffset);
80     RollingOffset += sizeof(dxbc::PartHeader) + Part.Size;
81   }
82   if (Error Err = validateSize(RollingOffset))
83     return Err;
84 
85   return Error::success();
86 }
87 
88 void DXContainerWriter::writeHeader(raw_ostream &OS) {
89   dxbc::Header Header;
90   memcpy(Header.Magic, "DXBC", 4);
91   memcpy(Header.FileHash.Digest, ObjectFile.Header.Hash.data(), 16);
92   Header.Version.Major = ObjectFile.Header.Version.Major;
93   Header.Version.Minor = ObjectFile.Header.Version.Minor;
94   Header.FileSize = *ObjectFile.Header.FileSize;
95   Header.PartCount = ObjectFile.Parts.size();
96   if (sys::IsBigEndianHost)
97     Header.swapBytes();
98   OS.write(reinterpret_cast<char *>(&Header), sizeof(Header));
99   for (auto &O : *ObjectFile.Header.PartOffsets)
100     if (sys::IsBigEndianHost)
101       sys::swapByteOrder(O);
102   OS.write(reinterpret_cast<char *>(ObjectFile.Header.PartOffsets->data()),
103            ObjectFile.Header.PartOffsets->size() * sizeof(uint32_t));
104 }
105 void DXContainerWriter::writeParts(raw_ostream &OS) {
106   uint32_t RollingOffset =
107       sizeof(dxbc::Header) + (ObjectFile.Header.PartCount * sizeof(uint32_t));
108   for (auto I : llvm::zip(ObjectFile.Parts, *ObjectFile.Header.PartOffsets)) {
109     if (RollingOffset < std::get<1>(I)) {
110       uint32_t PadBytes = std::get<1>(I) - RollingOffset;
111       std::vector<uint8_t> FillData(PadBytes, 0);
112       OS.write(reinterpret_cast<char *>(FillData.data()), PadBytes);
113     }
114     DXContainerYAML::Part P = std::get<0>(I);
115     OS.write(P.Name.c_str(), 4);
116     if (sys::IsBigEndianHost)
117       sys::swapByteOrder(P.Size);
118     OS.write(reinterpret_cast<const char *>(&P.Size), sizeof(uint32_t));
119     RollingOffset = std::get<1>(I) + sizeof(dxbc::PartHeader);
120 
121     // TODO: Write Part data
122   }
123 }
124 
125 Error DXContainerWriter::write(raw_ostream &OS) {
126   if (Error Err = computePartOffsets())
127     return Err;
128   writeHeader(OS);
129   writeParts(OS);
130   return Error::success();
131 }
132 
133 namespace llvm {
134 namespace yaml {
135 
136 bool yaml2dxcontainer(DXContainerYAML::Object &Doc, raw_ostream &Out,
137                       ErrorHandler EH) {
138   DXContainerWriter Writer(Doc);
139   if (Error Err = Writer.write(Out)) {
140     handleAllErrors(std::move(Err),
141                     [&](const ErrorInfoBase &Err) { EH(Err.message()); });
142     return false;
143   }
144   return true;
145 }
146 
147 } // namespace yaml
148 } // namespace llvm
149