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//===- DbiModuleDescriptorBuilder.cpp - PDB Mod Info Creation ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptorBuilder.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
#include "llvm/DebugInfo/MSF/MSFBuilder.h"
#include "llvm/DebugInfo/MSF/MSFCommon.h"
#include "llvm/DebugInfo/MSF/MappedBlockStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
#include "llvm/DebugInfo/PDB/Native/GSIStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/RawConstants.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/Support/BinaryStreamWriter.h"
using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::msf;
using namespace llvm::pdb;
static uint32_t calculateDiSymbolStreamSize(uint32_t SymbolByteSize,
uint32_t C13Size) {
uint32_t Size = sizeof(uint32_t); // Signature
Size += alignTo(SymbolByteSize, 4); // Symbol Data
Size += 0; // TODO: Layout.C11Bytes
Size += C13Size; // C13 Debug Info Size
Size += sizeof(uint32_t); // GlobalRefs substream size (always 0)
Size += 0; // GlobalRefs substream bytes
return Size;
}
DbiModuleDescriptorBuilder::DbiModuleDescriptorBuilder(StringRef ModuleName,
uint32_t ModIndex,
msf::MSFBuilder &Msf)
: MSF(Msf), ModuleName(ModuleName) {
::memset(&Layout, 0, sizeof(Layout));
Layout.Mod = ModIndex;
}
DbiModuleDescriptorBuilder::~DbiModuleDescriptorBuilder() {}
uint16_t DbiModuleDescriptorBuilder::getStreamIndex() const {
return Layout.ModDiStream;
}
void DbiModuleDescriptorBuilder::setObjFileName(StringRef Name) {
ObjFileName = Name;
}
void DbiModuleDescriptorBuilder::setPdbFilePathNI(uint32_t NI) {
PdbFilePathNI = NI;
}
void DbiModuleDescriptorBuilder::setFirstSectionContrib(
const SectionContrib &SC) {
Layout.SC = SC;
}
void DbiModuleDescriptorBuilder::addSymbol(CVSymbol Symbol) {
// Defer to the bulk API. It does the same thing.
addSymbolsInBulk(Symbol.data());
}
void DbiModuleDescriptorBuilder::addSymbolsInBulk(
ArrayRef<uint8_t> BulkSymbols) {
// Do nothing for empty runs of symbols.
if (BulkSymbols.empty())
return;
Symbols.push_back(BulkSymbols);
// Symbols written to a PDB file are required to be 4 byte aligned. The same
// is not true of object files.
assert(BulkSymbols.size() % alignOf(CodeViewContainer::Pdb) == 0 &&
"Invalid Symbol alignment!");
SymbolByteSize += BulkSymbols.size();
}
void DbiModuleDescriptorBuilder::addSourceFile(StringRef Path) {
SourceFiles.push_back(Path);
}
uint32_t DbiModuleDescriptorBuilder::calculateC13DebugInfoSize() const {
uint32_t Result = 0;
for (const auto &Builder : C13Builders) {
assert(Builder && "Empty C13 Fragment Builder!");
Result += Builder->calculateSerializedLength();
}
return Result;
}
uint32_t DbiModuleDescriptorBuilder::calculateSerializedLength() const {
uint32_t L = sizeof(Layout);
uint32_t M = ModuleName.size() + 1;
uint32_t O = ObjFileName.size() + 1;
return alignTo(L + M + O, sizeof(uint32_t));
}
void DbiModuleDescriptorBuilder::finalize() {
Layout.FileNameOffs = 0; // TODO: Fix this
Layout.Flags = 0; // TODO: Fix this
Layout.C11Bytes = 0;
Layout.C13Bytes = calculateC13DebugInfoSize();
(void)Layout.Mod; // Set in constructor
(void)Layout.ModDiStream; // Set in finalizeMsfLayout
Layout.NumFiles = SourceFiles.size();
Layout.PdbFilePathNI = PdbFilePathNI;
Layout.SrcFileNameNI = 0;
// This value includes both the signature field as well as the record bytes
// from the symbol stream.
Layout.SymBytes =
Layout.ModDiStream == kInvalidStreamIndex ? 0 : getNextSymbolOffset();
}
Error DbiModuleDescriptorBuilder::finalizeMsfLayout() {
this->Layout.ModDiStream = kInvalidStreamIndex;
uint32_t C13Size = calculateC13DebugInfoSize();
if (!C13Size && !SymbolByteSize)
return Error::success();
auto ExpectedSN =
MSF.addStream(calculateDiSymbolStreamSize(SymbolByteSize, C13Size));
if (!ExpectedSN)
return ExpectedSN.takeError();
Layout.ModDiStream = *ExpectedSN;
return Error::success();
}
Error DbiModuleDescriptorBuilder::commit(BinaryStreamWriter &ModiWriter,
const msf::MSFLayout &MsfLayout,
WritableBinaryStreamRef MsfBuffer) {
// We write the Modi record to the `ModiWriter`, but we additionally write its
// symbol stream to a brand new stream.
if (auto EC = ModiWriter.writeObject(Layout))
return EC;
if (auto EC = ModiWriter.writeCString(ModuleName))
return EC;
if (auto EC = ModiWriter.writeCString(ObjFileName))
return EC;
if (auto EC = ModiWriter.padToAlignment(sizeof(uint32_t)))
return EC;
if (Layout.ModDiStream != kInvalidStreamIndex) {
auto NS = WritableMappedBlockStream::createIndexedStream(
MsfLayout, MsfBuffer, Layout.ModDiStream, MSF.getAllocator());
WritableBinaryStreamRef Ref(*NS);
BinaryStreamWriter SymbolWriter(Ref);
// Write the symbols.
if (auto EC =
SymbolWriter.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC))
return EC;
for (ArrayRef<uint8_t> Syms : Symbols) {
if (auto EC = SymbolWriter.writeBytes(Syms))
return EC;
}
assert(SymbolWriter.getOffset() % alignOf(CodeViewContainer::Pdb) == 0 &&
"Invalid debug section alignment!");
// TODO: Write C11 Line data
for (const auto &Builder : C13Builders) {
assert(Builder && "Empty C13 Fragment Builder!");
if (auto EC = Builder->commit(SymbolWriter))
return EC;
}
// TODO: Figure out what GlobalRefs substream actually is and populate it.
if (auto EC = SymbolWriter.writeInteger<uint32_t>(0))
return EC;
if (SymbolWriter.bytesRemaining() > 0)
return make_error<RawError>(raw_error_code::stream_too_long);
}
return Error::success();
}
void DbiModuleDescriptorBuilder::addDebugSubsection(
std::shared_ptr<DebugSubsection> Subsection) {
assert(Subsection);
C13Builders.push_back(std::make_unique<DebugSubsectionRecordBuilder>(
std::move(Subsection), CodeViewContainer::Pdb));
}
void DbiModuleDescriptorBuilder::addDebugSubsection(
const DebugSubsectionRecord &SubsectionContents) {
C13Builders.push_back(std::make_unique<DebugSubsectionRecordBuilder>(
SubsectionContents, CodeViewContainer::Pdb));
}
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