[yaml2obj] Move core yaml2obj code into lib and include for use in unit tests
Reviewers: jhenderson, rupprecht, MaskRay, grimar, labath
Reviewed By: rupprecht
Subscribers: gribozavr, mgrang, seiya, mgorny, sbc100, hiraditya, aheejin, jakehehrlich, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65255
llvm-svn: 368119
diff --git a/llvm/lib/ObjectYAML/CMakeLists.txt b/llvm/lib/ObjectYAML/CMakeLists.txt
index 8943aab..434da71 100644
--- a/llvm/lib/ObjectYAML/CMakeLists.txt
+++ b/llvm/lib/ObjectYAML/CMakeLists.txt
@@ -3,15 +3,24 @@
CodeViewYAMLSymbols.cpp
CodeViewYAMLTypeHashing.cpp
CodeViewYAMLTypes.cpp
+ COFFEmitter.cpp
COFFYAML.cpp
DWARFEmitter.cpp
DWARFVisitor.cpp
DWARFYAML.cpp
+ ELFEmitter.cpp
ELFYAML.cpp
+ MachOEmitter.cpp
MachOYAML.cpp
ObjectYAML.cpp
+ MinidumpEmitter.cpp
MinidumpYAML.cpp
+ WasmEmitter.cpp
WasmYAML.cpp
XCOFFYAML.cpp
YAML.cpp
+ yaml2obj.cpp
+
+ ADDITIONAL_HEADER_DIRS
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/ObjectYAML
)
diff --git a/llvm/lib/ObjectYAML/COFFEmitter.cpp b/llvm/lib/ObjectYAML/COFFEmitter.cpp
new file mode 100644
index 0000000..d94cdbf
--- /dev/null
+++ b/llvm/lib/ObjectYAML/COFFEmitter.cpp
@@ -0,0 +1,619 @@
+//===- yaml2coff - Convert YAML to a COFF object file ---------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// The COFF component of yaml2obj.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
+#include "llvm/DebugInfo/CodeView/StringsAndChecksums.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/ObjectYAML/ObjectYAML.h"
+#include "llvm/ObjectYAML/yaml2obj.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Support/raw_ostream.h"
+#include <vector>
+
+using namespace llvm;
+
+namespace {
+
+/// This parses a yaml stream that represents a COFF object file.
+/// See docs/yaml2obj for the yaml scheema.
+struct COFFParser {
+ COFFParser(COFFYAML::Object &Obj)
+ : Obj(Obj), SectionTableStart(0), SectionTableSize(0) {
+ // A COFF string table always starts with a 4 byte size field. Offsets into
+ // it include this size, so allocate it now.
+ StringTable.append(4, char(0));
+ }
+
+ bool useBigObj() const {
+ return static_cast<int32_t>(Obj.Sections.size()) >
+ COFF::MaxNumberOfSections16;
+ }
+
+ bool isPE() const { return Obj.OptionalHeader.hasValue(); }
+ bool is64Bit() const {
+ return Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64 ||
+ Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_ARM64;
+ }
+
+ uint32_t getFileAlignment() const {
+ return Obj.OptionalHeader->Header.FileAlignment;
+ }
+
+ unsigned getHeaderSize() const {
+ return useBigObj() ? COFF::Header32Size : COFF::Header16Size;
+ }
+
+ unsigned getSymbolSize() const {
+ return useBigObj() ? COFF::Symbol32Size : COFF::Symbol16Size;
+ }
+
+ bool parseSections() {
+ for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(),
+ e = Obj.Sections.end();
+ i != e; ++i) {
+ COFFYAML::Section &Sec = *i;
+
+ // If the name is less than 8 bytes, store it in place, otherwise
+ // store it in the string table.
+ StringRef Name = Sec.Name;
+
+ if (Name.size() <= COFF::NameSize) {
+ std::copy(Name.begin(), Name.end(), Sec.Header.Name);
+ } else {
+ // Add string to the string table and format the index for output.
+ unsigned Index = getStringIndex(Name);
+ std::string str = utostr(Index);
+ if (str.size() > 7) {
+ errs() << "String table got too large\n";
+ return false;
+ }
+ Sec.Header.Name[0] = '/';
+ std::copy(str.begin(), str.end(), Sec.Header.Name + 1);
+ }
+
+ if (Sec.Alignment) {
+ if (Sec.Alignment > 8192) {
+ errs() << "Section alignment is too large\n";
+ return false;
+ }
+ if (!isPowerOf2_32(Sec.Alignment)) {
+ errs() << "Section alignment is not a power of 2\n";
+ return false;
+ }
+ Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20;
+ }
+ }
+ return true;
+ }
+
+ bool parseSymbols() {
+ for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(),
+ e = Obj.Symbols.end();
+ i != e; ++i) {
+ COFFYAML::Symbol &Sym = *i;
+
+ // If the name is less than 8 bytes, store it in place, otherwise
+ // store it in the string table.
+ StringRef Name = Sym.Name;
+ if (Name.size() <= COFF::NameSize) {
+ std::copy(Name.begin(), Name.end(), Sym.Header.Name);
+ } else {
+ // Add string to the string table and format the index for output.
+ unsigned Index = getStringIndex(Name);
+ *reinterpret_cast<support::aligned_ulittle32_t *>(Sym.Header.Name + 4) =
+ Index;
+ }
+
+ Sym.Header.Type = Sym.SimpleType;
+ Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT;
+ }
+ return true;
+ }
+
+ bool parse() {
+ if (!parseSections())
+ return false;
+ if (!parseSymbols())
+ return false;
+ return true;
+ }
+
+ unsigned getStringIndex(StringRef Str) {
+ StringMap<unsigned>::iterator i = StringTableMap.find(Str);
+ if (i == StringTableMap.end()) {
+ unsigned Index = StringTable.size();
+ StringTable.append(Str.begin(), Str.end());
+ StringTable.push_back(0);
+ StringTableMap[Str] = Index;
+ return Index;
+ }
+ return i->second;
+ }
+
+ COFFYAML::Object &Obj;
+
+ codeview::StringsAndChecksums StringsAndChecksums;
+ BumpPtrAllocator Allocator;
+ StringMap<unsigned> StringTableMap;
+ std::string StringTable;
+ uint32_t SectionTableStart;
+ uint32_t SectionTableSize;
+};
+
+enum { DOSStubSize = 128 };
+
+} // end anonymous namespace
+
+// Take a CP and assign addresses and sizes to everything. Returns false if the
+// layout is not valid to do.
+static bool layoutOptionalHeader(COFFParser &CP) {
+ if (!CP.isPE())
+ return true;
+ unsigned PEHeaderSize = CP.is64Bit() ? sizeof(object::pe32plus_header)
+ : sizeof(object::pe32_header);
+ CP.Obj.Header.SizeOfOptionalHeader =
+ PEHeaderSize +
+ sizeof(object::data_directory) * (COFF::NUM_DATA_DIRECTORIES + 1);
+ return true;
+}
+
+static yaml::BinaryRef
+toDebugS(ArrayRef<CodeViewYAML::YAMLDebugSubsection> Subsections,
+ const codeview::StringsAndChecksums &SC, BumpPtrAllocator &Allocator) {
+ using namespace codeview;
+ ExitOnError Err("Error occurred writing .debug$S section");
+ auto CVSS =
+ Err(CodeViewYAML::toCodeViewSubsectionList(Allocator, Subsections, SC));
+
+ std::vector<DebugSubsectionRecordBuilder> Builders;
+ uint32_t Size = sizeof(uint32_t);
+ for (auto &SS : CVSS) {
+ DebugSubsectionRecordBuilder B(SS, CodeViewContainer::ObjectFile);
+ Size += B.calculateSerializedLength();
+ Builders.push_back(std::move(B));
+ }
+ uint8_t *Buffer = Allocator.Allocate<uint8_t>(Size);
+ MutableArrayRef<uint8_t> Output(Buffer, Size);
+ BinaryStreamWriter Writer(Output, support::little);
+
+ Err(Writer.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC));
+ for (const auto &B : Builders) {
+ Err(B.commit(Writer));
+ }
+ return {Output};
+}
+
+// Take a CP and assign addresses and sizes to everything. Returns false if the
+// layout is not valid to do.
+static bool layoutCOFF(COFFParser &CP) {
+ // The section table starts immediately after the header, including the
+ // optional header.
+ CP.SectionTableStart =
+ CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader;
+ if (CP.isPE())
+ CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic);
+ CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size();
+
+ uint32_t CurrentSectionDataOffset =
+ CP.SectionTableStart + CP.SectionTableSize;
+
+ for (COFFYAML::Section &S : CP.Obj.Sections) {
+ // We support specifying exactly one of SectionData or Subsections. So if
+ // there is already some SectionData, then we don't need to do any of this.
+ if (S.Name == ".debug$S" && S.SectionData.binary_size() == 0) {
+ CodeViewYAML::initializeStringsAndChecksums(S.DebugS,
+ CP.StringsAndChecksums);
+ if (CP.StringsAndChecksums.hasChecksums() &&
+ CP.StringsAndChecksums.hasStrings())
+ break;
+ }
+ }
+
+ // Assign each section data address consecutively.
+ for (COFFYAML::Section &S : CP.Obj.Sections) {
+ if (S.Name == ".debug$S") {
+ if (S.SectionData.binary_size() == 0) {
+ assert(CP.StringsAndChecksums.hasStrings() &&
+ "Object file does not have debug string table!");
+
+ S.SectionData =
+ toDebugS(S.DebugS, CP.StringsAndChecksums, CP.Allocator);
+ }
+ } else if (S.Name == ".debug$T") {
+ if (S.SectionData.binary_size() == 0)
+ S.SectionData = CodeViewYAML::toDebugT(S.DebugT, CP.Allocator, S.Name);
+ } else if (S.Name == ".debug$P") {
+ if (S.SectionData.binary_size() == 0)
+ S.SectionData = CodeViewYAML::toDebugT(S.DebugP, CP.Allocator, S.Name);
+ } else if (S.Name == ".debug$H") {
+ if (S.DebugH.hasValue() && S.SectionData.binary_size() == 0)
+ S.SectionData = CodeViewYAML::toDebugH(*S.DebugH, CP.Allocator);
+ }
+
+ if (S.SectionData.binary_size() > 0) {
+ CurrentSectionDataOffset = alignTo(CurrentSectionDataOffset,
+ CP.isPE() ? CP.getFileAlignment() : 4);
+ S.Header.SizeOfRawData = S.SectionData.binary_size();
+ if (CP.isPE())
+ S.Header.SizeOfRawData =
+ alignTo(S.Header.SizeOfRawData, CP.getFileAlignment());
+ S.Header.PointerToRawData = CurrentSectionDataOffset;
+ CurrentSectionDataOffset += S.Header.SizeOfRawData;
+ if (!S.Relocations.empty()) {
+ S.Header.PointerToRelocations = CurrentSectionDataOffset;
+ S.Header.NumberOfRelocations = S.Relocations.size();
+ CurrentSectionDataOffset +=
+ S.Header.NumberOfRelocations * COFF::RelocationSize;
+ }
+ } else {
+ // Leave SizeOfRawData unaltered. For .bss sections in object files, it
+ // carries the section size.
+ S.Header.PointerToRawData = 0;
+ }
+ }
+
+ uint32_t SymbolTableStart = CurrentSectionDataOffset;
+
+ // Calculate number of symbols.
+ uint32_t NumberOfSymbols = 0;
+ for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(),
+ e = CP.Obj.Symbols.end();
+ i != e; ++i) {
+ uint32_t NumberOfAuxSymbols = 0;
+ if (i->FunctionDefinition)
+ NumberOfAuxSymbols += 1;
+ if (i->bfAndefSymbol)
+ NumberOfAuxSymbols += 1;
+ if (i->WeakExternal)
+ NumberOfAuxSymbols += 1;
+ if (!i->File.empty())
+ NumberOfAuxSymbols +=
+ (i->File.size() + CP.getSymbolSize() - 1) / CP.getSymbolSize();
+ if (i->SectionDefinition)
+ NumberOfAuxSymbols += 1;
+ if (i->CLRToken)
+ NumberOfAuxSymbols += 1;
+ i->Header.NumberOfAuxSymbols = NumberOfAuxSymbols;
+ NumberOfSymbols += 1 + NumberOfAuxSymbols;
+ }
+
+ // Store all the allocated start addresses in the header.
+ CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size();
+ CP.Obj.Header.NumberOfSymbols = NumberOfSymbols;
+ if (NumberOfSymbols > 0 || CP.StringTable.size() > 4)
+ CP.Obj.Header.PointerToSymbolTable = SymbolTableStart;
+ else
+ CP.Obj.Header.PointerToSymbolTable = 0;
+
+ *reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0]) =
+ CP.StringTable.size();
+
+ return true;
+}
+
+template <typename value_type> struct binary_le_impl {
+ value_type Value;
+ binary_le_impl(value_type V) : Value(V) {}
+};
+
+template <typename value_type>
+raw_ostream &operator<<(raw_ostream &OS,
+ const binary_le_impl<value_type> &BLE) {
+ char Buffer[sizeof(BLE.Value)];
+ support::endian::write<value_type, support::little, support::unaligned>(
+ Buffer, BLE.Value);
+ OS.write(Buffer, sizeof(BLE.Value));
+ return OS;
+}
+
+template <typename value_type>
+binary_le_impl<value_type> binary_le(value_type V) {
+ return binary_le_impl<value_type>(V);
+}
+
+template <size_t NumBytes> struct zeros_impl {};
+
+template <size_t NumBytes>
+raw_ostream &operator<<(raw_ostream &OS, const zeros_impl<NumBytes> &) {
+ char Buffer[NumBytes];
+ memset(Buffer, 0, sizeof(Buffer));
+ OS.write(Buffer, sizeof(Buffer));
+ return OS;
+}
+
+template <typename T> zeros_impl<sizeof(T)> zeros(const T &) {
+ return zeros_impl<sizeof(T)>();
+}
+
+template <typename T>
+static uint32_t initializeOptionalHeader(COFFParser &CP, uint16_t Magic,
+ T Header) {
+ memset(Header, 0, sizeof(*Header));
+ Header->Magic = Magic;
+ Header->SectionAlignment = CP.Obj.OptionalHeader->Header.SectionAlignment;
+ Header->FileAlignment = CP.Obj.OptionalHeader->Header.FileAlignment;
+ uint32_t SizeOfCode = 0, SizeOfInitializedData = 0,
+ SizeOfUninitializedData = 0;
+ uint32_t SizeOfHeaders = alignTo(CP.SectionTableStart + CP.SectionTableSize,
+ Header->FileAlignment);
+ uint32_t SizeOfImage = alignTo(SizeOfHeaders, Header->SectionAlignment);
+ uint32_t BaseOfData = 0;
+ for (const COFFYAML::Section &S : CP.Obj.Sections) {
+ if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_CODE)
+ SizeOfCode += S.Header.SizeOfRawData;
+ if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
+ SizeOfInitializedData += S.Header.SizeOfRawData;
+ if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
+ SizeOfUninitializedData += S.Header.SizeOfRawData;
+ if (S.Name.equals(".text"))
+ Header->BaseOfCode = S.Header.VirtualAddress; // RVA
+ else if (S.Name.equals(".data"))
+ BaseOfData = S.Header.VirtualAddress; // RVA
+ if (S.Header.VirtualAddress)
+ SizeOfImage += alignTo(S.Header.VirtualSize, Header->SectionAlignment);
+ }
+ Header->SizeOfCode = SizeOfCode;
+ Header->SizeOfInitializedData = SizeOfInitializedData;
+ Header->SizeOfUninitializedData = SizeOfUninitializedData;
+ Header->AddressOfEntryPoint =
+ CP.Obj.OptionalHeader->Header.AddressOfEntryPoint; // RVA
+ Header->ImageBase = CP.Obj.OptionalHeader->Header.ImageBase;
+ Header->MajorOperatingSystemVersion =
+ CP.Obj.OptionalHeader->Header.MajorOperatingSystemVersion;
+ Header->MinorOperatingSystemVersion =
+ CP.Obj.OptionalHeader->Header.MinorOperatingSystemVersion;
+ Header->MajorImageVersion = CP.Obj.OptionalHeader->Header.MajorImageVersion;
+ Header->MinorImageVersion = CP.Obj.OptionalHeader->Header.MinorImageVersion;
+ Header->MajorSubsystemVersion =
+ CP.Obj.OptionalHeader->Header.MajorSubsystemVersion;
+ Header->MinorSubsystemVersion =
+ CP.Obj.OptionalHeader->Header.MinorSubsystemVersion;
+ Header->SizeOfImage = SizeOfImage;
+ Header->SizeOfHeaders = SizeOfHeaders;
+ Header->Subsystem = CP.Obj.OptionalHeader->Header.Subsystem;
+ Header->DLLCharacteristics = CP.Obj.OptionalHeader->Header.DLLCharacteristics;
+ Header->SizeOfStackReserve = CP.Obj.OptionalHeader->Header.SizeOfStackReserve;
+ Header->SizeOfStackCommit = CP.Obj.OptionalHeader->Header.SizeOfStackCommit;
+ Header->SizeOfHeapReserve = CP.Obj.OptionalHeader->Header.SizeOfHeapReserve;
+ Header->SizeOfHeapCommit = CP.Obj.OptionalHeader->Header.SizeOfHeapCommit;
+ Header->NumberOfRvaAndSize = COFF::NUM_DATA_DIRECTORIES + 1;
+ return BaseOfData;
+}
+
+static bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
+ if (CP.isPE()) {
+ // PE files start with a DOS stub.
+ object::dos_header DH;
+ memset(&DH, 0, sizeof(DH));
+
+ // DOS EXEs start with "MZ" magic.
+ DH.Magic[0] = 'M';
+ DH.Magic[1] = 'Z';
+ // Initializing the AddressOfRelocationTable is strictly optional but
+ // mollifies certain tools which expect it to have a value greater than
+ // 0x40.
+ DH.AddressOfRelocationTable = sizeof(DH);
+ // This is the address of the PE signature.
+ DH.AddressOfNewExeHeader = DOSStubSize;
+
+ // Write out our DOS stub.
+ OS.write(reinterpret_cast<char *>(&DH), sizeof(DH));
+ // Write padding until we reach the position of where our PE signature
+ // should live.
+ OS.write_zeros(DOSStubSize - sizeof(DH));
+ // Write out the PE signature.
+ OS.write(COFF::PEMagic, sizeof(COFF::PEMagic));
+ }
+ if (CP.useBigObj()) {
+ OS << binary_le(static_cast<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN))
+ << binary_le(static_cast<uint16_t>(0xffff))
+ << binary_le(
+ static_cast<uint16_t>(COFF::BigObjHeader::MinBigObjectVersion))
+ << binary_le(CP.Obj.Header.Machine)
+ << binary_le(CP.Obj.Header.TimeDateStamp);
+ OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic));
+ OS << zeros(uint32_t(0)) << zeros(uint32_t(0)) << zeros(uint32_t(0))
+ << zeros(uint32_t(0)) << binary_le(CP.Obj.Header.NumberOfSections)
+ << binary_le(CP.Obj.Header.PointerToSymbolTable)
+ << binary_le(CP.Obj.Header.NumberOfSymbols);
+ } else {
+ OS << binary_le(CP.Obj.Header.Machine)
+ << binary_le(static_cast<int16_t>(CP.Obj.Header.NumberOfSections))
+ << binary_le(CP.Obj.Header.TimeDateStamp)
+ << binary_le(CP.Obj.Header.PointerToSymbolTable)
+ << binary_le(CP.Obj.Header.NumberOfSymbols)
+ << binary_le(CP.Obj.Header.SizeOfOptionalHeader)
+ << binary_le(CP.Obj.Header.Characteristics);
+ }
+ if (CP.isPE()) {
+ if (CP.is64Bit()) {
+ object::pe32plus_header PEH;
+ initializeOptionalHeader(CP, COFF::PE32Header::PE32_PLUS, &PEH);
+ OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
+ } else {
+ object::pe32_header PEH;
+ uint32_t BaseOfData =
+ initializeOptionalHeader(CP, COFF::PE32Header::PE32, &PEH);
+ PEH.BaseOfData = BaseOfData;
+ OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
+ }
+ for (const Optional<COFF::DataDirectory> &DD :
+ CP.Obj.OptionalHeader->DataDirectories) {
+ if (!DD.hasValue()) {
+ OS << zeros(uint32_t(0));
+ OS << zeros(uint32_t(0));
+ } else {
+ OS << binary_le(DD->RelativeVirtualAddress);
+ OS << binary_le(DD->Size);
+ }
+ }
+ OS << zeros(uint32_t(0));
+ OS << zeros(uint32_t(0));
+ }
+
+ assert(OS.tell() == CP.SectionTableStart);
+ // Output section table.
+ for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
+ e = CP.Obj.Sections.end();
+ i != e; ++i) {
+ OS.write(i->Header.Name, COFF::NameSize);
+ OS << binary_le(i->Header.VirtualSize)
+ << binary_le(i->Header.VirtualAddress)
+ << binary_le(i->Header.SizeOfRawData)
+ << binary_le(i->Header.PointerToRawData)
+ << binary_le(i->Header.PointerToRelocations)
+ << binary_le(i->Header.PointerToLineNumbers)
+ << binary_le(i->Header.NumberOfRelocations)
+ << binary_le(i->Header.NumberOfLineNumbers)
+ << binary_le(i->Header.Characteristics);
+ }
+ assert(OS.tell() == CP.SectionTableStart + CP.SectionTableSize);
+
+ unsigned CurSymbol = 0;
+ StringMap<unsigned> SymbolTableIndexMap;
+ for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(),
+ E = CP.Obj.Symbols.end();
+ I != E; ++I) {
+ SymbolTableIndexMap[I->Name] = CurSymbol;
+ CurSymbol += 1 + I->Header.NumberOfAuxSymbols;
+ }
+
+ // Output section data.
+ for (const COFFYAML::Section &S : CP.Obj.Sections) {
+ if (S.Header.SizeOfRawData == 0 || S.Header.PointerToRawData == 0)
+ continue;
+ assert(S.Header.PointerToRawData >= OS.tell());
+ OS.write_zeros(S.Header.PointerToRawData - OS.tell());
+ S.SectionData.writeAsBinary(OS);
+ assert(S.Header.SizeOfRawData >= S.SectionData.binary_size());
+ OS.write_zeros(S.Header.SizeOfRawData - S.SectionData.binary_size());
+ for (const COFFYAML::Relocation &R : S.Relocations) {
+ uint32_t SymbolTableIndex;
+ if (R.SymbolTableIndex) {
+ if (!R.SymbolName.empty())
+ WithColor::error()
+ << "Both SymbolName and SymbolTableIndex specified\n";
+ SymbolTableIndex = *R.SymbolTableIndex;
+ } else {
+ SymbolTableIndex = SymbolTableIndexMap[R.SymbolName];
+ }
+ OS << binary_le(R.VirtualAddress) << binary_le(SymbolTableIndex)
+ << binary_le(R.Type);
+ }
+ }
+
+ // Output symbol table.
+
+ for (std::vector<COFFYAML::Symbol>::const_iterator i = CP.Obj.Symbols.begin(),
+ e = CP.Obj.Symbols.end();
+ i != e; ++i) {
+ OS.write(i->Header.Name, COFF::NameSize);
+ OS << binary_le(i->Header.Value);
+ if (CP.useBigObj())
+ OS << binary_le(i->Header.SectionNumber);
+ else
+ OS << binary_le(static_cast<int16_t>(i->Header.SectionNumber));
+ OS << binary_le(i->Header.Type) << binary_le(i->Header.StorageClass)
+ << binary_le(i->Header.NumberOfAuxSymbols);
+
+ if (i->FunctionDefinition) {
+ OS << binary_le(i->FunctionDefinition->TagIndex)
+ << binary_le(i->FunctionDefinition->TotalSize)
+ << binary_le(i->FunctionDefinition->PointerToLinenumber)
+ << binary_le(i->FunctionDefinition->PointerToNextFunction)
+ << zeros(i->FunctionDefinition->unused);
+ OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
+ }
+ if (i->bfAndefSymbol) {
+ OS << zeros(i->bfAndefSymbol->unused1)
+ << binary_le(i->bfAndefSymbol->Linenumber)
+ << zeros(i->bfAndefSymbol->unused2)
+ << binary_le(i->bfAndefSymbol->PointerToNextFunction)
+ << zeros(i->bfAndefSymbol->unused3);
+ OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
+ }
+ if (i->WeakExternal) {
+ OS << binary_le(i->WeakExternal->TagIndex)
+ << binary_le(i->WeakExternal->Characteristics)
+ << zeros(i->WeakExternal->unused);
+ OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
+ }
+ if (!i->File.empty()) {
+ unsigned SymbolSize = CP.getSymbolSize();
+ uint32_t NumberOfAuxRecords =
+ (i->File.size() + SymbolSize - 1) / SymbolSize;
+ uint32_t NumberOfAuxBytes = NumberOfAuxRecords * SymbolSize;
+ uint32_t NumZeros = NumberOfAuxBytes - i->File.size();
+ OS.write(i->File.data(), i->File.size());
+ OS.write_zeros(NumZeros);
+ }
+ if (i->SectionDefinition) {
+ OS << binary_le(i->SectionDefinition->Length)
+ << binary_le(i->SectionDefinition->NumberOfRelocations)
+ << binary_le(i->SectionDefinition->NumberOfLinenumbers)
+ << binary_le(i->SectionDefinition->CheckSum)
+ << binary_le(static_cast<int16_t>(i->SectionDefinition->Number))
+ << binary_le(i->SectionDefinition->Selection)
+ << zeros(i->SectionDefinition->unused)
+ << binary_le(static_cast<int16_t>(i->SectionDefinition->Number >> 16));
+ OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
+ }
+ if (i->CLRToken) {
+ OS << binary_le(i->CLRToken->AuxType) << zeros(i->CLRToken->unused1)
+ << binary_le(i->CLRToken->SymbolTableIndex)
+ << zeros(i->CLRToken->unused2);
+ OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
+ }
+ }
+
+ // Output string table.
+ if (CP.Obj.Header.PointerToSymbolTable)
+ OS.write(&CP.StringTable[0], CP.StringTable.size());
+ return true;
+}
+
+namespace llvm {
+namespace yaml {
+
+int yaml2coff(llvm::COFFYAML::Object &Doc, raw_ostream &Out) {
+ COFFParser CP(Doc);
+ if (!CP.parse()) {
+ errs() << "yaml2obj: Failed to parse YAML file!\n";
+ return 1;
+ }
+
+ if (!layoutOptionalHeader(CP)) {
+ errs() << "yaml2obj: Failed to layout optional header for COFF file!\n";
+ return 1;
+ }
+
+ if (!layoutCOFF(CP)) {
+ errs() << "yaml2obj: Failed to layout COFF file!\n";
+ return 1;
+ }
+ if (!writeCOFF(CP, Out)) {
+ errs() << "yaml2obj: Failed to write COFF file!\n";
+ return 1;
+ }
+ return 0;
+}
+
+} // namespace yaml
+} // namespace llvm
diff --git a/llvm/lib/ObjectYAML/ELFEmitter.cpp b/llvm/lib/ObjectYAML/ELFEmitter.cpp
new file mode 100644
index 0000000..370d620
--- /dev/null
+++ b/llvm/lib/ObjectYAML/ELFEmitter.cpp
@@ -0,0 +1,1083 @@
+//===- yaml2elf - Convert YAML to a ELF object file -----------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// The ELF component of yaml2obj.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/MC/StringTableBuilder.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/ObjectYAML/ELFYAML.h"
+#include "llvm/ObjectYAML/yaml2obj.h"
+#include "llvm/Support/EndianStream.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+// This class is used to build up a contiguous binary blob while keeping
+// track of an offset in the output (which notionally begins at
+// `InitialOffset`).
+namespace {
+class ContiguousBlobAccumulator {
+ const uint64_t InitialOffset;
+ SmallVector<char, 128> Buf;
+ raw_svector_ostream OS;
+
+ /// \returns The new offset.
+ uint64_t padToAlignment(unsigned Align) {
+ if (Align == 0)
+ Align = 1;
+ uint64_t CurrentOffset = InitialOffset + OS.tell();
+ uint64_t AlignedOffset = alignTo(CurrentOffset, Align);
+ OS.write_zeros(AlignedOffset - CurrentOffset);
+ return AlignedOffset; // == CurrentOffset;
+ }
+
+public:
+ ContiguousBlobAccumulator(uint64_t InitialOffset_)
+ : InitialOffset(InitialOffset_), Buf(), OS(Buf) {}
+ template <class Integer>
+ raw_ostream &getOSAndAlignedOffset(Integer &Offset, unsigned Align) {
+ Offset = padToAlignment(Align);
+ return OS;
+ }
+ void writeBlobToStream(raw_ostream &Out) { Out << OS.str(); }
+};
+
+// Used to keep track of section and symbol names, so that in the YAML file
+// sections and symbols can be referenced by name instead of by index.
+class NameToIdxMap {
+ StringMap<unsigned> Map;
+
+public:
+ /// \Returns false if name is already present in the map.
+ bool addName(StringRef Name, unsigned Ndx) {
+ return Map.insert({Name, Ndx}).second;
+ }
+ /// \Returns false if name is not present in the map.
+ bool lookup(StringRef Name, unsigned &Idx) const {
+ auto I = Map.find(Name);
+ if (I == Map.end())
+ return false;
+ Idx = I->getValue();
+ return true;
+ }
+ /// Asserts if name is not present in the map.
+ unsigned get(StringRef Name) const {
+ unsigned Idx;
+ if (lookup(Name, Idx))
+ return Idx;
+ assert(false && "Expected section not found in index");
+ return 0;
+ }
+ unsigned size() const { return Map.size(); }
+};
+
+/// "Single point of truth" for the ELF file construction.
+/// TODO: This class still has a ways to go before it is truly a "single
+/// point of truth".
+template <class ELFT> class ELFState {
+ typedef typename ELFT::Ehdr Elf_Ehdr;
+ typedef typename ELFT::Phdr Elf_Phdr;
+ typedef typename ELFT::Shdr Elf_Shdr;
+ typedef typename ELFT::Sym Elf_Sym;
+ typedef typename ELFT::Rel Elf_Rel;
+ typedef typename ELFT::Rela Elf_Rela;
+ typedef typename ELFT::Relr Elf_Relr;
+ typedef typename ELFT::Dyn Elf_Dyn;
+
+ enum class SymtabType { Static, Dynamic };
+
+ /// The future ".strtab" section.
+ StringTableBuilder DotStrtab{StringTableBuilder::ELF};
+
+ /// The future ".shstrtab" section.
+ StringTableBuilder DotShStrtab{StringTableBuilder::ELF};
+
+ /// The future ".dynstr" section.
+ StringTableBuilder DotDynstr{StringTableBuilder::ELF};
+
+ NameToIdxMap SN2I;
+ NameToIdxMap SymN2I;
+ ELFYAML::Object &Doc;
+
+ bool buildSectionIndex();
+ bool buildSymbolIndex(ArrayRef<ELFYAML::Symbol> Symbols);
+ void initELFHeader(Elf_Ehdr &Header);
+ void initProgramHeaders(std::vector<Elf_Phdr> &PHeaders);
+ bool initImplicitHeader(ELFState<ELFT> &State, ContiguousBlobAccumulator &CBA,
+ Elf_Shdr &Header, StringRef SecName,
+ ELFYAML::Section *YAMLSec);
+ bool initSectionHeaders(ELFState<ELFT> &State,
+ std::vector<Elf_Shdr> &SHeaders,
+ ContiguousBlobAccumulator &CBA);
+ void initSymtabSectionHeader(Elf_Shdr &SHeader, SymtabType STType,
+ ContiguousBlobAccumulator &CBA,
+ ELFYAML::Section *YAMLSec);
+ void initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
+ StringTableBuilder &STB,
+ ContiguousBlobAccumulator &CBA,
+ ELFYAML::Section *YAMLSec);
+ void setProgramHeaderLayout(std::vector<Elf_Phdr> &PHeaders,
+ std::vector<Elf_Shdr> &SHeaders);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::RawContentSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::RelocationSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader, const ELFYAML::Group &Group,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::SymverSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::VerneedSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::VerdefSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::MipsABIFlags &Section,
+ ContiguousBlobAccumulator &CBA);
+ bool writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::DynamicSection &Section,
+ ContiguousBlobAccumulator &CBA);
+ ELFState(ELFYAML::Object &D);
+
+public:
+ static int writeELF(raw_ostream &OS, ELFYAML::Object &Doc);
+
+private:
+ void finalizeStrings();
+};
+} // end anonymous namespace
+
+template <class T> static size_t arrayDataSize(ArrayRef<T> A) {
+ return A.size() * sizeof(T);
+}
+
+template <class T> static void writeArrayData(raw_ostream &OS, ArrayRef<T> A) {
+ OS.write((const char *)A.data(), arrayDataSize(A));
+}
+
+template <class T> static void zero(T &Obj) { memset(&Obj, 0, sizeof(Obj)); }
+
+template <class ELFT> ELFState<ELFT>::ELFState(ELFYAML::Object &D) : Doc(D) {
+ StringSet<> DocSections;
+ for (std::unique_ptr<ELFYAML::Section> &D : Doc.Sections)
+ if (!D->Name.empty())
+ DocSections.insert(D->Name);
+
+ // Insert SHT_NULL section implicitly when it is not defined in YAML.
+ if (Doc.Sections.empty() || Doc.Sections.front()->Type != ELF::SHT_NULL)
+ Doc.Sections.insert(
+ Doc.Sections.begin(),
+ llvm::make_unique<ELFYAML::Section>(
+ ELFYAML::Section::SectionKind::RawContent, /*IsImplicit=*/true));
+
+ std::vector<StringRef> ImplicitSections = {".symtab", ".strtab", ".shstrtab"};
+ if (!Doc.DynamicSymbols.empty())
+ ImplicitSections.insert(ImplicitSections.end(), {".dynsym", ".dynstr"});
+
+ // Insert placeholders for implicit sections that are not
+ // defined explicitly in YAML.
+ for (StringRef SecName : ImplicitSections) {
+ if (DocSections.count(SecName))
+ continue;
+
+ std::unique_ptr<ELFYAML::Section> Sec = llvm::make_unique<ELFYAML::Section>(
+ ELFYAML::Section::SectionKind::RawContent, true /*IsImplicit*/);
+ Sec->Name = SecName;
+ Doc.Sections.push_back(std::move(Sec));
+ }
+}
+
+template <class ELFT> void ELFState<ELFT>::initELFHeader(Elf_Ehdr &Header) {
+ using namespace llvm::ELF;
+ zero(Header);
+ Header.e_ident[EI_MAG0] = 0x7f;
+ Header.e_ident[EI_MAG1] = 'E';
+ Header.e_ident[EI_MAG2] = 'L';
+ Header.e_ident[EI_MAG3] = 'F';
+ Header.e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
+ Header.e_ident[EI_DATA] = Doc.Header.Data;
+ Header.e_ident[EI_VERSION] = EV_CURRENT;
+ Header.e_ident[EI_OSABI] = Doc.Header.OSABI;
+ Header.e_ident[EI_ABIVERSION] = Doc.Header.ABIVersion;
+ Header.e_type = Doc.Header.Type;
+ Header.e_machine = Doc.Header.Machine;
+ Header.e_version = EV_CURRENT;
+ Header.e_entry = Doc.Header.Entry;
+ Header.e_phoff = sizeof(Header);
+ Header.e_flags = Doc.Header.Flags;
+ Header.e_ehsize = sizeof(Elf_Ehdr);
+ Header.e_phentsize = sizeof(Elf_Phdr);
+ Header.e_phnum = Doc.ProgramHeaders.size();
+
+ Header.e_shentsize =
+ Doc.Header.SHEntSize ? (uint16_t)*Doc.Header.SHEntSize : sizeof(Elf_Shdr);
+ // Immediately following the ELF header and program headers.
+ Header.e_shoff =
+ Doc.Header.SHOffset
+ ? (typename ELFT::uint)(*Doc.Header.SHOffset)
+ : sizeof(Header) + sizeof(Elf_Phdr) * Doc.ProgramHeaders.size();
+ Header.e_shnum =
+ Doc.Header.SHNum ? (uint16_t)*Doc.Header.SHNum : Doc.Sections.size();
+ Header.e_shstrndx = Doc.Header.SHStrNdx ? (uint16_t)*Doc.Header.SHStrNdx
+ : SN2I.get(".shstrtab");
+}
+
+template <class ELFT>
+void ELFState<ELFT>::initProgramHeaders(std::vector<Elf_Phdr> &PHeaders) {
+ for (const auto &YamlPhdr : Doc.ProgramHeaders) {
+ Elf_Phdr Phdr;
+ Phdr.p_type = YamlPhdr.Type;
+ Phdr.p_flags = YamlPhdr.Flags;
+ Phdr.p_vaddr = YamlPhdr.VAddr;
+ Phdr.p_paddr = YamlPhdr.PAddr;
+ PHeaders.push_back(Phdr);
+ }
+}
+
+static bool convertSectionIndex(NameToIdxMap &SN2I, StringRef SecName,
+ StringRef IndexSrc, unsigned &IndexDest) {
+ if (!SN2I.lookup(IndexSrc, IndexDest) && !to_integer(IndexSrc, IndexDest)) {
+ WithColor::error() << "Unknown section referenced: '" << IndexSrc
+ << "' at YAML section '" << SecName << "'.\n";
+ return false;
+ }
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::initImplicitHeader(ELFState<ELFT> &State,
+ ContiguousBlobAccumulator &CBA,
+ Elf_Shdr &Header, StringRef SecName,
+ ELFYAML::Section *YAMLSec) {
+ // Check if the header was already initialized.
+ if (Header.sh_offset)
+ return false;
+
+ if (SecName == ".symtab")
+ State.initSymtabSectionHeader(Header, SymtabType::Static, CBA, YAMLSec);
+ else if (SecName == ".strtab")
+ State.initStrtabSectionHeader(Header, SecName, State.DotStrtab, CBA,
+ YAMLSec);
+ else if (SecName == ".shstrtab")
+ State.initStrtabSectionHeader(Header, SecName, State.DotShStrtab, CBA,
+ YAMLSec);
+
+ else if (SecName == ".dynsym")
+ State.initSymtabSectionHeader(Header, SymtabType::Dynamic, CBA, YAMLSec);
+ else if (SecName == ".dynstr")
+ State.initStrtabSectionHeader(Header, SecName, State.DotDynstr, CBA,
+ YAMLSec);
+ else
+ return false;
+
+ // Override the sh_offset/sh_size fields if requested.
+ if (YAMLSec) {
+ if (YAMLSec->ShOffset)
+ Header.sh_offset = *YAMLSec->ShOffset;
+ if (YAMLSec->ShSize)
+ Header.sh_size = *YAMLSec->ShSize;
+ }
+
+ return true;
+}
+
+static StringRef dropUniqueSuffix(StringRef S) {
+ size_t SuffixPos = S.rfind(" [");
+ if (SuffixPos == StringRef::npos)
+ return S;
+ return S.substr(0, SuffixPos);
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::initSectionHeaders(ELFState<ELFT> &State,
+ std::vector<Elf_Shdr> &SHeaders,
+ ContiguousBlobAccumulator &CBA) {
+ // Ensure SHN_UNDEF entry is present. An all-zero section header is a
+ // valid SHN_UNDEF entry since SHT_NULL == 0.
+ SHeaders.resize(Doc.Sections.size());
+
+ for (size_t I = 0; I < Doc.Sections.size(); ++I) {
+ ELFYAML::Section *Sec = Doc.Sections[I].get();
+ if (I == 0 && Sec->IsImplicit)
+ continue;
+
+ // We have a few sections like string or symbol tables that are usually
+ // added implicitly to the end. However, if they are explicitly specified
+ // in the YAML, we need to write them here. This ensures the file offset
+ // remains correct.
+ Elf_Shdr &SHeader = SHeaders[I];
+ if (initImplicitHeader(State, CBA, SHeader, Sec->Name,
+ Sec->IsImplicit ? nullptr : Sec))
+ continue;
+
+ assert(Sec && "It can't be null unless it is an implicit section. But all "
+ "implicit sections should already have been handled above.");
+
+ SHeader.sh_name = DotShStrtab.getOffset(dropUniqueSuffix(Sec->Name));
+ SHeader.sh_type = Sec->Type;
+ if (Sec->Flags)
+ SHeader.sh_flags = *Sec->Flags;
+ SHeader.sh_addr = Sec->Address;
+ SHeader.sh_addralign = Sec->AddressAlign;
+
+ if (!Sec->Link.empty()) {
+ unsigned Index;
+ if (!convertSectionIndex(SN2I, Sec->Name, Sec->Link, Index))
+ return false;
+ SHeader.sh_link = Index;
+ }
+
+ if (I == 0) {
+ if (auto RawSec = dyn_cast<ELFYAML::RawContentSection>(Sec)) {
+ // We do not write any content for special SHN_UNDEF section.
+ if (RawSec->Size)
+ SHeader.sh_size = *RawSec->Size;
+ if (RawSec->Info)
+ SHeader.sh_info = *RawSec->Info;
+ }
+ if (Sec->EntSize)
+ SHeader.sh_entsize = *Sec->EntSize;
+ } else if (auto S = dyn_cast<ELFYAML::RawContentSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::RelocationSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::Group>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::MipsABIFlags>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::NoBitsSection>(Sec)) {
+ SHeader.sh_entsize = 0;
+ SHeader.sh_size = S->Size;
+ // SHT_NOBITS section does not have content
+ // so just to setup the section offset.
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ } else if (auto S = dyn_cast<ELFYAML::DynamicSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::SymverSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::VerneedSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else if (auto S = dyn_cast<ELFYAML::VerdefSection>(Sec)) {
+ if (!writeSectionContent(SHeader, *S, CBA))
+ return false;
+ } else
+ llvm_unreachable("Unknown section type");
+
+ // Override the sh_offset/sh_size fields if requested.
+ if (Sec) {
+ if (Sec->ShOffset)
+ SHeader.sh_offset = *Sec->ShOffset;
+ if (Sec->ShSize)
+ SHeader.sh_size = *Sec->ShSize;
+ }
+ }
+
+ return true;
+}
+
+static size_t findFirstNonGlobal(ArrayRef<ELFYAML::Symbol> Symbols) {
+ for (size_t I = 0; I < Symbols.size(); ++I)
+ if (Symbols[I].Binding.value != ELF::STB_LOCAL)
+ return I;
+ return Symbols.size();
+}
+
+static uint64_t writeRawSectionData(raw_ostream &OS,
+ const ELFYAML::RawContentSection &RawSec) {
+ size_t ContentSize = 0;
+ if (RawSec.Content) {
+ RawSec.Content->writeAsBinary(OS);
+ ContentSize = RawSec.Content->binary_size();
+ }
+
+ if (!RawSec.Size)
+ return ContentSize;
+
+ OS.write_zeros(*RawSec.Size - ContentSize);
+ return *RawSec.Size;
+}
+
+template <class ELFT>
+static std::vector<typename ELFT::Sym>
+toELFSymbols(NameToIdxMap &SN2I, ArrayRef<ELFYAML::Symbol> Symbols,
+ const StringTableBuilder &Strtab) {
+ using Elf_Sym = typename ELFT::Sym;
+
+ std::vector<Elf_Sym> Ret;
+ Ret.resize(Symbols.size() + 1);
+
+ size_t I = 0;
+ for (const auto &Sym : Symbols) {
+ Elf_Sym &Symbol = Ret[++I];
+
+ // If NameIndex, which contains the name offset, is explicitly specified, we
+ // use it. This is useful for preparing broken objects. Otherwise, we add
+ // the specified Name to the string table builder to get its offset.
+ if (Sym.NameIndex)
+ Symbol.st_name = *Sym.NameIndex;
+ else if (!Sym.Name.empty())
+ Symbol.st_name = Strtab.getOffset(dropUniqueSuffix(Sym.Name));
+
+ Symbol.setBindingAndType(Sym.Binding, Sym.Type);
+ if (!Sym.Section.empty()) {
+ unsigned Index;
+ if (!SN2I.lookup(Sym.Section, Index)) {
+ WithColor::error() << "Unknown section referenced: '" << Sym.Section
+ << "' by YAML symbol " << Sym.Name << ".\n";
+ exit(1);
+ }
+ Symbol.st_shndx = Index;
+ } else if (Sym.Index) {
+ Symbol.st_shndx = *Sym.Index;
+ }
+ // else Symbol.st_shndex == SHN_UNDEF (== 0), since it was zero'd earlier.
+ Symbol.st_value = Sym.Value;
+ Symbol.st_other = Sym.Other;
+ Symbol.st_size = Sym.Size;
+ }
+
+ return Ret;
+}
+
+template <class ELFT>
+void ELFState<ELFT>::initSymtabSectionHeader(Elf_Shdr &SHeader,
+ SymtabType STType,
+ ContiguousBlobAccumulator &CBA,
+ ELFYAML::Section *YAMLSec) {
+
+ bool IsStatic = STType == SymtabType::Static;
+ const auto &Symbols = IsStatic ? Doc.Symbols : Doc.DynamicSymbols;
+
+ ELFYAML::RawContentSection *RawSec =
+ dyn_cast_or_null<ELFYAML::RawContentSection>(YAMLSec);
+ if (RawSec && !Symbols.empty() && (RawSec->Content || RawSec->Size)) {
+ if (RawSec->Content)
+ WithColor::error() << "Cannot specify both `Content` and " +
+ (IsStatic ? Twine("`Symbols`")
+ : Twine("`DynamicSymbols`")) +
+ " for symbol table section '"
+ << RawSec->Name << "'.\n";
+ if (RawSec->Size)
+ WithColor::error() << "Cannot specify both `Size` and " +
+ (IsStatic ? Twine("`Symbols`")
+ : Twine("`DynamicSymbols`")) +
+ " for symbol table section '"
+ << RawSec->Name << "'.\n";
+ exit(1);
+ }
+
+ zero(SHeader);
+ SHeader.sh_name = DotShStrtab.getOffset(IsStatic ? ".symtab" : ".dynsym");
+
+ if (YAMLSec)
+ SHeader.sh_type = YAMLSec->Type;
+ else
+ SHeader.sh_type = IsStatic ? ELF::SHT_SYMTAB : ELF::SHT_DYNSYM;
+
+ if (RawSec && !RawSec->Link.empty()) {
+ // If the Link field is explicitly defined in the document,
+ // we should use it.
+ unsigned Index;
+ if (!convertSectionIndex(SN2I, RawSec->Name, RawSec->Link, Index))
+ return;
+ SHeader.sh_link = Index;
+ } else {
+ // When we describe the .dynsym section in the document explicitly, it is
+ // allowed to omit the "DynamicSymbols" tag. In this case .dynstr is not
+ // added implicitly and we should be able to leave the Link zeroed if
+ // .dynstr is not defined.
+ unsigned Link = 0;
+ if (IsStatic)
+ Link = SN2I.get(".strtab");
+ else
+ SN2I.lookup(".dynstr", Link);
+ SHeader.sh_link = Link;
+ }
+
+ if (YAMLSec && YAMLSec->Flags)
+ SHeader.sh_flags = *YAMLSec->Flags;
+ else if (!IsStatic)
+ SHeader.sh_flags = ELF::SHF_ALLOC;
+
+ // If the symbol table section is explicitly described in the YAML
+ // then we should set the fields requested.
+ SHeader.sh_info = (RawSec && RawSec->Info) ? (unsigned)(*RawSec->Info)
+ : findFirstNonGlobal(Symbols) + 1;
+ SHeader.sh_entsize = (YAMLSec && YAMLSec->EntSize)
+ ? (uint64_t)(*YAMLSec->EntSize)
+ : sizeof(Elf_Sym);
+ SHeader.sh_addralign = YAMLSec ? (uint64_t)YAMLSec->AddressAlign : 8;
+ SHeader.sh_addr = YAMLSec ? (uint64_t)YAMLSec->Address : 0;
+
+ auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ if (RawSec && (RawSec->Content || RawSec->Size)) {
+ assert(Symbols.empty());
+ SHeader.sh_size = writeRawSectionData(OS, *RawSec);
+ return;
+ }
+
+ std::vector<Elf_Sym> Syms =
+ toELFSymbols<ELFT>(SN2I, Symbols, IsStatic ? DotStrtab : DotDynstr);
+ writeArrayData(OS, makeArrayRef(Syms));
+ SHeader.sh_size = arrayDataSize(makeArrayRef(Syms));
+}
+
+template <class ELFT>
+void ELFState<ELFT>::initStrtabSectionHeader(Elf_Shdr &SHeader, StringRef Name,
+ StringTableBuilder &STB,
+ ContiguousBlobAccumulator &CBA,
+ ELFYAML::Section *YAMLSec) {
+ zero(SHeader);
+ SHeader.sh_name = DotShStrtab.getOffset(Name);
+ SHeader.sh_type = YAMLSec ? YAMLSec->Type : ELF::SHT_STRTAB;
+ SHeader.sh_addralign = YAMLSec ? (uint64_t)YAMLSec->AddressAlign : 1;
+
+ ELFYAML::RawContentSection *RawSec =
+ dyn_cast_or_null<ELFYAML::RawContentSection>(YAMLSec);
+
+ auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ if (RawSec && (RawSec->Content || RawSec->Size)) {
+ SHeader.sh_size = writeRawSectionData(OS, *RawSec);
+ } else {
+ STB.write(OS);
+ SHeader.sh_size = STB.getSize();
+ }
+
+ if (YAMLSec && YAMLSec->EntSize)
+ SHeader.sh_entsize = *YAMLSec->EntSize;
+
+ if (RawSec && RawSec->Info)
+ SHeader.sh_info = *RawSec->Info;
+
+ if (YAMLSec && YAMLSec->Flags)
+ SHeader.sh_flags = *YAMLSec->Flags;
+ else if (Name == ".dynstr")
+ SHeader.sh_flags = ELF::SHF_ALLOC;
+
+ // If the section is explicitly described in the YAML
+ // then we want to use its section address.
+ if (YAMLSec)
+ SHeader.sh_addr = YAMLSec->Address;
+}
+
+template <class ELFT>
+void ELFState<ELFT>::setProgramHeaderLayout(std::vector<Elf_Phdr> &PHeaders,
+ std::vector<Elf_Shdr> &SHeaders) {
+ uint32_t PhdrIdx = 0;
+ for (auto &YamlPhdr : Doc.ProgramHeaders) {
+ Elf_Phdr &PHeader = PHeaders[PhdrIdx++];
+
+ std::vector<Elf_Shdr *> Sections;
+ for (const ELFYAML::SectionName &SecName : YamlPhdr.Sections) {
+ unsigned Index;
+ if (!SN2I.lookup(SecName.Section, Index)) {
+ WithColor::error() << "Unknown section referenced: '" << SecName.Section
+ << "' by program header.\n";
+ exit(1);
+ }
+ Sections.push_back(&SHeaders[Index]);
+ }
+
+ if (YamlPhdr.Offset) {
+ PHeader.p_offset = *YamlPhdr.Offset;
+ } else {
+ if (YamlPhdr.Sections.size())
+ PHeader.p_offset = UINT32_MAX;
+ else
+ PHeader.p_offset = 0;
+
+ // Find the minimum offset for the program header.
+ for (Elf_Shdr *SHeader : Sections)
+ PHeader.p_offset = std::min(PHeader.p_offset, SHeader->sh_offset);
+ }
+
+ // Find the maximum offset of the end of a section in order to set p_filesz,
+ // if not set explicitly.
+ if (YamlPhdr.FileSize) {
+ PHeader.p_filesz = *YamlPhdr.FileSize;
+ } else {
+ PHeader.p_filesz = 0;
+ for (Elf_Shdr *SHeader : Sections) {
+ uint64_t EndOfSection;
+ if (SHeader->sh_type == llvm::ELF::SHT_NOBITS)
+ EndOfSection = SHeader->sh_offset;
+ else
+ EndOfSection = SHeader->sh_offset + SHeader->sh_size;
+ uint64_t EndOfSegment = PHeader.p_offset + PHeader.p_filesz;
+ EndOfSegment = std::max(EndOfSegment, EndOfSection);
+ PHeader.p_filesz = EndOfSegment - PHeader.p_offset;
+ }
+ }
+
+ // If not set explicitly, find the memory size by adding the size of
+ // sections at the end of the segment. These should be empty (size of zero)
+ // and NOBITS sections.
+ if (YamlPhdr.MemSize) {
+ PHeader.p_memsz = *YamlPhdr.MemSize;
+ } else {
+ PHeader.p_memsz = PHeader.p_filesz;
+ for (Elf_Shdr *SHeader : Sections)
+ if (SHeader->sh_offset == PHeader.p_offset + PHeader.p_filesz)
+ PHeader.p_memsz += SHeader->sh_size;
+ }
+
+ // Set the alignment of the segment to be the same as the maximum alignment
+ // of the sections with the same offset so that by default the segment
+ // has a valid and sensible alignment.
+ if (YamlPhdr.Align) {
+ PHeader.p_align = *YamlPhdr.Align;
+ } else {
+ PHeader.p_align = 1;
+ for (Elf_Shdr *SHeader : Sections)
+ if (SHeader->sh_offset == PHeader.p_offset)
+ PHeader.p_align = std::max(PHeader.p_align, SHeader->sh_addralign);
+ }
+ }
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(
+ Elf_Shdr &SHeader, const ELFYAML::RawContentSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ raw_ostream &OS =
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ SHeader.sh_size = writeRawSectionData(OS, Section);
+
+ if (Section.EntSize)
+ SHeader.sh_entsize = *Section.EntSize;
+ else if (Section.Type == llvm::ELF::SHT_RELR)
+ SHeader.sh_entsize = sizeof(Elf_Relr);
+ else
+ SHeader.sh_entsize = 0;
+
+ if (Section.Info)
+ SHeader.sh_info = *Section.Info;
+
+ return true;
+}
+
+static bool isMips64EL(const ELFYAML::Object &Doc) {
+ return Doc.Header.Machine == ELFYAML::ELF_EM(llvm::ELF::EM_MIPS) &&
+ Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64) &&
+ Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(
+ Elf_Shdr &SHeader, const ELFYAML::RelocationSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ assert((Section.Type == llvm::ELF::SHT_REL ||
+ Section.Type == llvm::ELF::SHT_RELA) &&
+ "Section type is not SHT_REL nor SHT_RELA");
+
+ bool IsRela = Section.Type == llvm::ELF::SHT_RELA;
+ SHeader.sh_entsize = IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
+ SHeader.sh_size = SHeader.sh_entsize * Section.Relocations.size();
+
+ // For relocation section set link to .symtab by default.
+ if (Section.Link.empty())
+ SHeader.sh_link = SN2I.get(".symtab");
+
+ unsigned Index = 0;
+ if (!Section.RelocatableSec.empty() &&
+ !convertSectionIndex(SN2I, Section.Name, Section.RelocatableSec, Index))
+ return false;
+ SHeader.sh_info = Index;
+
+ auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+
+ for (const auto &Rel : Section.Relocations) {
+ unsigned SymIdx = 0;
+ // If a relocation references a symbol, try to look one up in the symbol
+ // table. If it is not there, treat the value as a symbol index.
+ if (Rel.Symbol && !SymN2I.lookup(*Rel.Symbol, SymIdx) &&
+ !to_integer(*Rel.Symbol, SymIdx)) {
+ WithColor::error() << "Unknown symbol referenced: '" << *Rel.Symbol
+ << "' at YAML section '" << Section.Name << "'.\n";
+ return false;
+ }
+
+ if (IsRela) {
+ Elf_Rela REntry;
+ zero(REntry);
+ REntry.r_offset = Rel.Offset;
+ REntry.r_addend = Rel.Addend;
+ REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
+ OS.write((const char *)&REntry, sizeof(REntry));
+ } else {
+ Elf_Rel REntry;
+ zero(REntry);
+ REntry.r_offset = Rel.Offset;
+ REntry.setSymbolAndType(SymIdx, Rel.Type, isMips64EL(Doc));
+ OS.write((const char *)&REntry, sizeof(REntry));
+ }
+ }
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::Group &Section,
+ ContiguousBlobAccumulator &CBA) {
+ assert(Section.Type == llvm::ELF::SHT_GROUP &&
+ "Section type is not SHT_GROUP");
+
+ SHeader.sh_entsize = 4;
+ SHeader.sh_size = SHeader.sh_entsize * Section.Members.size();
+
+ unsigned SymIdx;
+ if (!SymN2I.lookup(Section.Signature, SymIdx) &&
+ !to_integer(Section.Signature, SymIdx)) {
+ WithColor::error() << "Unknown symbol referenced: '" << Section.Signature
+ << "' at YAML section '" << Section.Name << "'.\n";
+ return false;
+ }
+ SHeader.sh_info = SymIdx;
+
+ raw_ostream &OS =
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+
+ for (const ELFYAML::SectionOrType &Member : Section.Members) {
+ unsigned int SectionIndex = 0;
+ if (Member.sectionNameOrType == "GRP_COMDAT")
+ SectionIndex = llvm::ELF::GRP_COMDAT;
+ else if (!convertSectionIndex(SN2I, Section.Name, Member.sectionNameOrType,
+ SectionIndex))
+ return false;
+ support::endian::write<uint32_t>(OS, SectionIndex, ELFT::TargetEndianness);
+ }
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::SymverSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ raw_ostream &OS =
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ for (uint16_t Version : Section.Entries)
+ support::endian::write<uint16_t>(OS, Version, ELFT::TargetEndianness);
+
+ SHeader.sh_entsize = Section.EntSize ? (uint64_t)*Section.EntSize : 2;
+ SHeader.sh_size = Section.Entries.size() * SHeader.sh_entsize;
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::VerdefSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ typedef typename ELFT::Verdef Elf_Verdef;
+ typedef typename ELFT::Verdaux Elf_Verdaux;
+ raw_ostream &OS =
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+
+ uint64_t AuxCnt = 0;
+ for (size_t I = 0; I < Section.Entries.size(); ++I) {
+ const ELFYAML::VerdefEntry &E = Section.Entries[I];
+
+ Elf_Verdef VerDef;
+ VerDef.vd_version = E.Version;
+ VerDef.vd_flags = E.Flags;
+ VerDef.vd_ndx = E.VersionNdx;
+ VerDef.vd_hash = E.Hash;
+ VerDef.vd_aux = sizeof(Elf_Verdef);
+ VerDef.vd_cnt = E.VerNames.size();
+ if (I == Section.Entries.size() - 1)
+ VerDef.vd_next = 0;
+ else
+ VerDef.vd_next =
+ sizeof(Elf_Verdef) + E.VerNames.size() * sizeof(Elf_Verdaux);
+ OS.write((const char *)&VerDef, sizeof(Elf_Verdef));
+
+ for (size_t J = 0; J < E.VerNames.size(); ++J, ++AuxCnt) {
+ Elf_Verdaux VernAux;
+ VernAux.vda_name = DotDynstr.getOffset(E.VerNames[J]);
+ if (J == E.VerNames.size() - 1)
+ VernAux.vda_next = 0;
+ else
+ VernAux.vda_next = sizeof(Elf_Verdaux);
+ OS.write((const char *)&VernAux, sizeof(Elf_Verdaux));
+ }
+ }
+
+ SHeader.sh_size = Section.Entries.size() * sizeof(Elf_Verdef) +
+ AuxCnt * sizeof(Elf_Verdaux);
+ SHeader.sh_info = Section.Info;
+
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::VerneedSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ typedef typename ELFT::Verneed Elf_Verneed;
+ typedef typename ELFT::Vernaux Elf_Vernaux;
+
+ auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+
+ uint64_t AuxCnt = 0;
+ for (size_t I = 0; I < Section.VerneedV.size(); ++I) {
+ const ELFYAML::VerneedEntry &VE = Section.VerneedV[I];
+
+ Elf_Verneed VerNeed;
+ VerNeed.vn_version = VE.Version;
+ VerNeed.vn_file = DotDynstr.getOffset(VE.File);
+ if (I == Section.VerneedV.size() - 1)
+ VerNeed.vn_next = 0;
+ else
+ VerNeed.vn_next =
+ sizeof(Elf_Verneed) + VE.AuxV.size() * sizeof(Elf_Vernaux);
+ VerNeed.vn_cnt = VE.AuxV.size();
+ VerNeed.vn_aux = sizeof(Elf_Verneed);
+ OS.write((const char *)&VerNeed, sizeof(Elf_Verneed));
+
+ for (size_t J = 0; J < VE.AuxV.size(); ++J, ++AuxCnt) {
+ const ELFYAML::VernauxEntry &VAuxE = VE.AuxV[J];
+
+ Elf_Vernaux VernAux;
+ VernAux.vna_hash = VAuxE.Hash;
+ VernAux.vna_flags = VAuxE.Flags;
+ VernAux.vna_other = VAuxE.Other;
+ VernAux.vna_name = DotDynstr.getOffset(VAuxE.Name);
+ if (J == VE.AuxV.size() - 1)
+ VernAux.vna_next = 0;
+ else
+ VernAux.vna_next = sizeof(Elf_Vernaux);
+ OS.write((const char *)&VernAux, sizeof(Elf_Vernaux));
+ }
+ }
+
+ SHeader.sh_size = Section.VerneedV.size() * sizeof(Elf_Verneed) +
+ AuxCnt * sizeof(Elf_Vernaux);
+ SHeader.sh_info = Section.Info;
+
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::MipsABIFlags &Section,
+ ContiguousBlobAccumulator &CBA) {
+ assert(Section.Type == llvm::ELF::SHT_MIPS_ABIFLAGS &&
+ "Section type is not SHT_MIPS_ABIFLAGS");
+
+ object::Elf_Mips_ABIFlags<ELFT> Flags;
+ zero(Flags);
+ SHeader.sh_entsize = sizeof(Flags);
+ SHeader.sh_size = SHeader.sh_entsize;
+
+ auto &OS = CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ Flags.version = Section.Version;
+ Flags.isa_level = Section.ISALevel;
+ Flags.isa_rev = Section.ISARevision;
+ Flags.gpr_size = Section.GPRSize;
+ Flags.cpr1_size = Section.CPR1Size;
+ Flags.cpr2_size = Section.CPR2Size;
+ Flags.fp_abi = Section.FpABI;
+ Flags.isa_ext = Section.ISAExtension;
+ Flags.ases = Section.ASEs;
+ Flags.flags1 = Section.Flags1;
+ Flags.flags2 = Section.Flags2;
+ OS.write((const char *)&Flags, sizeof(Flags));
+
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::writeSectionContent(Elf_Shdr &SHeader,
+ const ELFYAML::DynamicSection &Section,
+ ContiguousBlobAccumulator &CBA) {
+ typedef typename ELFT::uint uintX_t;
+
+ assert(Section.Type == llvm::ELF::SHT_DYNAMIC &&
+ "Section type is not SHT_DYNAMIC");
+
+ if (!Section.Entries.empty() && Section.Content) {
+ WithColor::error()
+ << "Cannot specify both raw content and explicit entries "
+ "for dynamic section '"
+ << Section.Name << "'.\n";
+ return false;
+ }
+
+ if (Section.Content)
+ SHeader.sh_size = Section.Content->binary_size();
+ else
+ SHeader.sh_size = 2 * sizeof(uintX_t) * Section.Entries.size();
+ if (Section.EntSize)
+ SHeader.sh_entsize = *Section.EntSize;
+ else
+ SHeader.sh_entsize = sizeof(Elf_Dyn);
+
+ raw_ostream &OS =
+ CBA.getOSAndAlignedOffset(SHeader.sh_offset, SHeader.sh_addralign);
+ for (const ELFYAML::DynamicEntry &DE : Section.Entries) {
+ support::endian::write<uintX_t>(OS, DE.Tag, ELFT::TargetEndianness);
+ support::endian::write<uintX_t>(OS, DE.Val, ELFT::TargetEndianness);
+ }
+ if (Section.Content)
+ Section.Content->writeAsBinary(OS);
+
+ return true;
+}
+
+template <class ELFT> bool ELFState<ELFT>::buildSectionIndex() {
+ for (unsigned I = 0, E = Doc.Sections.size(); I != E; ++I) {
+ StringRef Name = Doc.Sections[I]->Name;
+ if (Name.empty())
+ continue;
+
+ DotShStrtab.add(dropUniqueSuffix(Name));
+ if (!SN2I.addName(Name, I)) {
+ WithColor::error() << "Repeated section name: '" << Name
+ << "' at YAML section number " << I << ".\n";
+ return false;
+ }
+ }
+
+ DotShStrtab.finalize();
+ return true;
+}
+
+template <class ELFT>
+bool ELFState<ELFT>::buildSymbolIndex(ArrayRef<ELFYAML::Symbol> Symbols) {
+ bool GlobalSymbolSeen = false;
+ std::size_t I = 0;
+ for (const auto &Sym : Symbols) {
+ ++I;
+
+ StringRef Name = Sym.Name;
+ if (Sym.Binding.value == ELF::STB_LOCAL && GlobalSymbolSeen) {
+ WithColor::error() << "Local symbol '" + Name +
+ "' after global in Symbols list.\n";
+ return false;
+ }
+ if (Sym.Binding.value != ELF::STB_LOCAL)
+ GlobalSymbolSeen = true;
+
+ if (!Name.empty() && !SymN2I.addName(Name, I)) {
+ WithColor::error() << "Repeated symbol name: '" << Name << "'.\n";
+ return false;
+ }
+ }
+ return true;
+}
+
+template <class ELFT> void ELFState<ELFT>::finalizeStrings() {
+ // Add the regular symbol names to .strtab section.
+ for (const ELFYAML::Symbol &Sym : Doc.Symbols)
+ DotStrtab.add(dropUniqueSuffix(Sym.Name));
+ DotStrtab.finalize();
+
+ // Add the dynamic symbol names to .dynstr section.
+ for (const ELFYAML::Symbol &Sym : Doc.DynamicSymbols)
+ DotDynstr.add(dropUniqueSuffix(Sym.Name));
+
+ // SHT_GNU_verdef and SHT_GNU_verneed sections might also
+ // add strings to .dynstr section.
+ for (const std::unique_ptr<ELFYAML::Section> &Sec : Doc.Sections) {
+ if (auto VerNeed = dyn_cast<ELFYAML::VerneedSection>(Sec.get())) {
+ for (const ELFYAML::VerneedEntry &VE : VerNeed->VerneedV) {
+ DotDynstr.add(VE.File);
+ for (const ELFYAML::VernauxEntry &Aux : VE.AuxV)
+ DotDynstr.add(Aux.Name);
+ }
+ } else if (auto VerDef = dyn_cast<ELFYAML::VerdefSection>(Sec.get())) {
+ for (const ELFYAML::VerdefEntry &E : VerDef->Entries)
+ for (StringRef Name : E.VerNames)
+ DotDynstr.add(Name);
+ }
+ }
+
+ DotDynstr.finalize();
+}
+
+template <class ELFT>
+int ELFState<ELFT>::writeELF(raw_ostream &OS, ELFYAML::Object &Doc) {
+ ELFState<ELFT> State(Doc);
+
+ // Finalize .strtab and .dynstr sections. We do that early because want to
+ // finalize the string table builders before writing the content of the
+ // sections that might want to use them.
+ State.finalizeStrings();
+
+ if (!State.buildSectionIndex())
+ return 1;
+
+ if (!State.buildSymbolIndex(Doc.Symbols))
+ return 1;
+
+ Elf_Ehdr Header;
+ State.initELFHeader(Header);
+
+ // TODO: Flesh out section header support.
+
+ std::vector<Elf_Phdr> PHeaders;
+ State.initProgramHeaders(PHeaders);
+
+ // XXX: This offset is tightly coupled with the order that we write
+ // things to `OS`.
+ const size_t SectionContentBeginOffset = Header.e_ehsize +
+ Header.e_phentsize * Header.e_phnum +
+ Header.e_shentsize * Header.e_shnum;
+ ContiguousBlobAccumulator CBA(SectionContentBeginOffset);
+
+ std::vector<Elf_Shdr> SHeaders;
+ if (!State.initSectionHeaders(State, SHeaders, CBA))
+ return 1;
+
+ // Now we can decide segment offsets
+ State.setProgramHeaderLayout(PHeaders, SHeaders);
+
+ OS.write((const char *)&Header, sizeof(Header));
+ writeArrayData(OS, makeArrayRef(PHeaders));
+ writeArrayData(OS, makeArrayRef(SHeaders));
+ CBA.writeBlobToStream(OS);
+ return 0;
+}
+
+namespace llvm {
+namespace yaml {
+
+int yaml2elf(llvm::ELFYAML::Object &Doc, raw_ostream &Out) {
+ bool IsLE = Doc.Header.Data == ELFYAML::ELF_ELFDATA(ELF::ELFDATA2LSB);
+ bool Is64Bit = Doc.Header.Class == ELFYAML::ELF_ELFCLASS(ELF::ELFCLASS64);
+ if (Is64Bit) {
+ if (IsLE)
+ return ELFState<object::ELF64LE>::writeELF(Out, Doc);
+ return ELFState<object::ELF64BE>::writeELF(Out, Doc);
+ }
+ if (IsLE)
+ return ELFState<object::ELF32LE>::writeELF(Out, Doc);
+ return ELFState<object::ELF32BE>::writeELF(Out, Doc);
+}
+
+} // namespace yaml
+} // namespace llvm
diff --git a/llvm/lib/ObjectYAML/LLVMBuild.txt b/llvm/lib/ObjectYAML/LLVMBuild.txt
index c921236..de43aaf 100644
--- a/llvm/lib/ObjectYAML/LLVMBuild.txt
+++ b/llvm/lib/ObjectYAML/LLVMBuild.txt
@@ -10,4 +10,4 @@
type = Library
name = ObjectYAML
parent = Libraries
-required_libraries = Object Support DebugInfoCodeView
+required_libraries = Object Support DebugInfoCodeView MC
diff --git a/llvm/lib/ObjectYAML/MachOEmitter.cpp b/llvm/lib/ObjectYAML/MachOEmitter.cpp
new file mode 100644
index 0000000..e7789d0
--- /dev/null
+++ b/llvm/lib/ObjectYAML/MachOEmitter.cpp
@@ -0,0 +1,608 @@
+//===- yaml2macho - Convert YAML to a Mach object file --------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// The Mach component of yaml2obj.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/BinaryFormat/MachO.h"
+#include "llvm/ObjectYAML/DWARFEmitter.h"
+#include "llvm/ObjectYAML/ObjectYAML.h"
+#include "llvm/ObjectYAML/yaml2obj.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include "llvm/Support/Format.h"
+
+using namespace llvm;
+
+namespace {
+
+class MachOWriter {
+public:
+ MachOWriter(MachOYAML::Object &Obj) : Obj(Obj), is64Bit(true), fileStart(0) {
+ is64Bit = Obj.Header.magic == MachO::MH_MAGIC_64 ||
+ Obj.Header.magic == MachO::MH_CIGAM_64;
+ memset(reinterpret_cast<void *>(&Header), 0, sizeof(MachO::mach_header_64));
+ }
+
+ Error writeMachO(raw_ostream &OS);
+
+private:
+ Error writeHeader(raw_ostream &OS);
+ Error writeLoadCommands(raw_ostream &OS);
+ Error writeSectionData(raw_ostream &OS);
+ Error writeLinkEditData(raw_ostream &OS);
+
+ void writeBindOpcodes(raw_ostream &OS,
+ std::vector<MachOYAML::BindOpcode> &BindOpcodes);
+ // LinkEdit writers
+ Error writeRebaseOpcodes(raw_ostream &OS);
+ Error writeBasicBindOpcodes(raw_ostream &OS);
+ Error writeWeakBindOpcodes(raw_ostream &OS);
+ Error writeLazyBindOpcodes(raw_ostream &OS);
+ Error writeNameList(raw_ostream &OS);
+ Error writeStringTable(raw_ostream &OS);
+ Error writeExportTrie(raw_ostream &OS);
+
+ void dumpExportEntry(raw_ostream &OS, MachOYAML::ExportEntry &Entry);
+ void ZeroToOffset(raw_ostream &OS, size_t offset);
+
+ MachOYAML::Object &Obj;
+ bool is64Bit;
+ uint64_t fileStart;
+
+ MachO::mach_header_64 Header;
+};
+
+Error MachOWriter::writeMachO(raw_ostream &OS) {
+ fileStart = OS.tell();
+ if (auto Err = writeHeader(OS))
+ return Err;
+ if (auto Err = writeLoadCommands(OS))
+ return Err;
+ if (auto Err = writeSectionData(OS))
+ return Err;
+ return Error::success();
+}
+
+Error MachOWriter::writeHeader(raw_ostream &OS) {
+ Header.magic = Obj.Header.magic;
+ Header.cputype = Obj.Header.cputype;
+ Header.cpusubtype = Obj.Header.cpusubtype;
+ Header.filetype = Obj.Header.filetype;
+ Header.ncmds = Obj.Header.ncmds;
+ Header.sizeofcmds = Obj.Header.sizeofcmds;
+ Header.flags = Obj.Header.flags;
+ Header.reserved = Obj.Header.reserved;
+
+ if (Obj.IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(Header);
+
+ auto header_size =
+ is64Bit ? sizeof(MachO::mach_header_64) : sizeof(MachO::mach_header);
+ OS.write((const char *)&Header, header_size);
+
+ return Error::success();
+}
+
+template <typename SectionType>
+SectionType constructSection(MachOYAML::Section Sec) {
+ SectionType TempSec;
+ memcpy(reinterpret_cast<void *>(&TempSec.sectname[0]), &Sec.sectname[0], 16);
+ memcpy(reinterpret_cast<void *>(&TempSec.segname[0]), &Sec.segname[0], 16);
+ TempSec.addr = Sec.addr;
+ TempSec.size = Sec.size;
+ TempSec.offset = Sec.offset;
+ TempSec.align = Sec.align;
+ TempSec.reloff = Sec.reloff;
+ TempSec.nreloc = Sec.nreloc;
+ TempSec.flags = Sec.flags;
+ TempSec.reserved1 = Sec.reserved1;
+ TempSec.reserved2 = Sec.reserved2;
+ return TempSec;
+}
+
+template <typename StructType>
+size_t writeLoadCommandData(MachOYAML::LoadCommand &LC, raw_ostream &OS,
+ bool IsLittleEndian) {
+ return 0;
+}
+
+template <>
+size_t writeLoadCommandData<MachO::segment_command>(MachOYAML::LoadCommand &LC,
+ raw_ostream &OS,
+ bool IsLittleEndian) {
+ size_t BytesWritten = 0;
+ for (const auto &Sec : LC.Sections) {
+ auto TempSec = constructSection<MachO::section>(Sec);
+ if (IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(TempSec);
+ OS.write(reinterpret_cast<const char *>(&(TempSec)),
+ sizeof(MachO::section));
+ BytesWritten += sizeof(MachO::section);
+ }
+ return BytesWritten;
+}
+
+template <>
+size_t writeLoadCommandData<MachO::segment_command_64>(
+ MachOYAML::LoadCommand &LC, raw_ostream &OS, bool IsLittleEndian) {
+ size_t BytesWritten = 0;
+ for (const auto &Sec : LC.Sections) {
+ auto TempSec = constructSection<MachO::section_64>(Sec);
+ TempSec.reserved3 = Sec.reserved3;
+ if (IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(TempSec);
+ OS.write(reinterpret_cast<const char *>(&(TempSec)),
+ sizeof(MachO::section_64));
+ BytesWritten += sizeof(MachO::section_64);
+ }
+ return BytesWritten;
+}
+
+size_t writePayloadString(MachOYAML::LoadCommand &LC, raw_ostream &OS) {
+ size_t BytesWritten = 0;
+ if (!LC.PayloadString.empty()) {
+ OS.write(LC.PayloadString.c_str(), LC.PayloadString.length());
+ BytesWritten = LC.PayloadString.length();
+ }
+ return BytesWritten;
+}
+
+template <>
+size_t writeLoadCommandData<MachO::dylib_command>(MachOYAML::LoadCommand &LC,
+ raw_ostream &OS,
+ bool IsLittleEndian) {
+ return writePayloadString(LC, OS);
+}
+
+template <>
+size_t writeLoadCommandData<MachO::dylinker_command>(MachOYAML::LoadCommand &LC,
+ raw_ostream &OS,
+ bool IsLittleEndian) {
+ return writePayloadString(LC, OS);
+}
+
+template <>
+size_t writeLoadCommandData<MachO::rpath_command>(MachOYAML::LoadCommand &LC,
+ raw_ostream &OS,
+ bool IsLittleEndian) {
+ return writePayloadString(LC, OS);
+}
+
+template <>
+size_t writeLoadCommandData<MachO::build_version_command>(
+ MachOYAML::LoadCommand &LC, raw_ostream &OS, bool IsLittleEndian) {
+ size_t BytesWritten = 0;
+ for (const auto &T : LC.Tools) {
+ struct MachO::build_tool_version tool = T;
+ if (IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(tool);
+ OS.write(reinterpret_cast<const char *>(&tool),
+ sizeof(MachO::build_tool_version));
+ BytesWritten += sizeof(MachO::build_tool_version);
+ }
+ return BytesWritten;
+}
+
+void ZeroFillBytes(raw_ostream &OS, size_t Size) {
+ std::vector<uint8_t> FillData;
+ FillData.insert(FillData.begin(), Size, 0);
+ OS.write(reinterpret_cast<char *>(FillData.data()), Size);
+}
+
+void Fill(raw_ostream &OS, size_t Size, uint32_t Data) {
+ std::vector<uint32_t> FillData;
+ FillData.insert(FillData.begin(), (Size / 4) + 1, Data);
+ OS.write(reinterpret_cast<char *>(FillData.data()), Size);
+}
+
+void MachOWriter::ZeroToOffset(raw_ostream &OS, size_t Offset) {
+ auto currOffset = OS.tell() - fileStart;
+ if (currOffset < Offset)
+ ZeroFillBytes(OS, Offset - currOffset);
+}
+
+Error MachOWriter::writeLoadCommands(raw_ostream &OS) {
+ for (auto &LC : Obj.LoadCommands) {
+ size_t BytesWritten = 0;
+ llvm::MachO::macho_load_command Data = LC.Data;
+
+#define HANDLE_LOAD_COMMAND(LCName, LCValue, LCStruct) \
+ case MachO::LCName: \
+ if (Obj.IsLittleEndian != sys::IsLittleEndianHost) \
+ MachO::swapStruct(Data.LCStruct##_data); \
+ OS.write(reinterpret_cast<const char *>(&(Data.LCStruct##_data)), \
+ sizeof(MachO::LCStruct)); \
+ BytesWritten = sizeof(MachO::LCStruct); \
+ BytesWritten += \
+ writeLoadCommandData<MachO::LCStruct>(LC, OS, Obj.IsLittleEndian); \
+ break;
+
+ switch (LC.Data.load_command_data.cmd) {
+ default:
+ if (Obj.IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(Data.load_command_data);
+ OS.write(reinterpret_cast<const char *>(&(Data.load_command_data)),
+ sizeof(MachO::load_command));
+ BytesWritten = sizeof(MachO::load_command);
+ BytesWritten +=
+ writeLoadCommandData<MachO::load_command>(LC, OS, Obj.IsLittleEndian);
+ break;
+#include "llvm/BinaryFormat/MachO.def"
+ }
+
+ if (LC.PayloadBytes.size() > 0) {
+ OS.write(reinterpret_cast<const char *>(LC.PayloadBytes.data()),
+ LC.PayloadBytes.size());
+ BytesWritten += LC.PayloadBytes.size();
+ }
+
+ if (LC.ZeroPadBytes > 0) {
+ ZeroFillBytes(OS, LC.ZeroPadBytes);
+ BytesWritten += LC.ZeroPadBytes;
+ }
+
+ // Fill remaining bytes with 0. This will only get hit in partially
+ // specified test cases.
+ auto BytesRemaining = LC.Data.load_command_data.cmdsize - BytesWritten;
+ if (BytesRemaining > 0) {
+ ZeroFillBytes(OS, BytesRemaining);
+ }
+ }
+ return Error::success();
+}
+
+static bool isVirtualSection(uint8_t type) {
+ return (type == MachO::S_ZEROFILL || type == MachO::S_GB_ZEROFILL ||
+ type == MachO::S_THREAD_LOCAL_ZEROFILL);
+}
+
+Error MachOWriter::writeSectionData(raw_ostream &OS) {
+ bool FoundLinkEditSeg = false;
+ for (auto &LC : Obj.LoadCommands) {
+ switch (LC.Data.load_command_data.cmd) {
+ case MachO::LC_SEGMENT:
+ case MachO::LC_SEGMENT_64:
+ uint64_t segOff = is64Bit ? LC.Data.segment_command_64_data.fileoff
+ : LC.Data.segment_command_data.fileoff;
+ if (0 ==
+ strncmp(&LC.Data.segment_command_data.segname[0], "__LINKEDIT", 16)) {
+ FoundLinkEditSeg = true;
+ if (auto Err = writeLinkEditData(OS))
+ return Err;
+ }
+ for (auto &Sec : LC.Sections) {
+ ZeroToOffset(OS, Sec.offset);
+ // Zero Fill any data between the end of the last thing we wrote and the
+ // start of this section.
+ assert((OS.tell() - fileStart <= Sec.offset ||
+ Sec.offset == (uint32_t)0) &&
+ "Wrote too much data somewhere, section offsets don't line up.");
+ if (0 == strncmp(&Sec.segname[0], "__DWARF", 16)) {
+ if (0 == strncmp(&Sec.sectname[0], "__debug_str", 16)) {
+ DWARFYAML::EmitDebugStr(OS, Obj.DWARF);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_abbrev", 16)) {
+ DWARFYAML::EmitDebugAbbrev(OS, Obj.DWARF);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_aranges", 16)) {
+ DWARFYAML::EmitDebugAranges(OS, Obj.DWARF);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_pubnames", 16)) {
+ DWARFYAML::EmitPubSection(OS, Obj.DWARF.PubNames,
+ Obj.IsLittleEndian);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_pubtypes", 16)) {
+ DWARFYAML::EmitPubSection(OS, Obj.DWARF.PubTypes,
+ Obj.IsLittleEndian);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_info", 16)) {
+ DWARFYAML::EmitDebugInfo(OS, Obj.DWARF);
+ } else if (0 == strncmp(&Sec.sectname[0], "__debug_line", 16)) {
+ DWARFYAML::EmitDebugLine(OS, Obj.DWARF);
+ }
+
+ continue;
+ }
+
+ // Skip if it's a virtual section.
+ if (isVirtualSection(Sec.flags & MachO::SECTION_TYPE))
+ continue;
+
+ // Fill section data with 0xDEADBEEF
+ Fill(OS, Sec.size, 0xDEADBEEFu);
+ }
+ uint64_t segSize = is64Bit ? LC.Data.segment_command_64_data.filesize
+ : LC.Data.segment_command_data.filesize;
+ ZeroToOffset(OS, segOff + segSize);
+ break;
+ }
+ }
+ // Old PPC Object Files didn't have __LINKEDIT segments, the data was just
+ // stuck at the end of the file.
+ if (!FoundLinkEditSeg) {
+ if (auto Err = writeLinkEditData(OS))
+ return Err;
+ }
+ return Error::success();
+}
+
+void MachOWriter::writeBindOpcodes(
+ raw_ostream &OS, std::vector<MachOYAML::BindOpcode> &BindOpcodes) {
+
+ for (auto Opcode : BindOpcodes) {
+ uint8_t OpByte = Opcode.Opcode | Opcode.Imm;
+ OS.write(reinterpret_cast<char *>(&OpByte), 1);
+ for (auto Data : Opcode.ULEBExtraData) {
+ encodeULEB128(Data, OS);
+ }
+ for (auto Data : Opcode.SLEBExtraData) {
+ encodeSLEB128(Data, OS);
+ }
+ if (!Opcode.Symbol.empty()) {
+ OS.write(Opcode.Symbol.data(), Opcode.Symbol.size());
+ OS.write('\0');
+ }
+ }
+}
+
+void MachOWriter::dumpExportEntry(raw_ostream &OS,
+ MachOYAML::ExportEntry &Entry) {
+ encodeSLEB128(Entry.TerminalSize, OS);
+ if (Entry.TerminalSize > 0) {
+ encodeSLEB128(Entry.Flags, OS);
+ if (Entry.Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT) {
+ encodeSLEB128(Entry.Other, OS);
+ OS << Entry.ImportName;
+ OS.write('\0');
+ } else {
+ encodeSLEB128(Entry.Address, OS);
+ if (Entry.Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER)
+ encodeSLEB128(Entry.Other, OS);
+ }
+ }
+ OS.write(static_cast<uint8_t>(Entry.Children.size()));
+ for (auto EE : Entry.Children) {
+ OS << EE.Name;
+ OS.write('\0');
+ encodeSLEB128(EE.NodeOffset, OS);
+ }
+ for (auto EE : Entry.Children)
+ dumpExportEntry(OS, EE);
+}
+
+Error MachOWriter::writeExportTrie(raw_ostream &OS) {
+ dumpExportEntry(OS, Obj.LinkEdit.ExportTrie);
+ return Error::success();
+}
+
+template <typename NListType>
+void writeNListEntry(MachOYAML::NListEntry &NLE, raw_ostream &OS,
+ bool IsLittleEndian) {
+ NListType ListEntry;
+ ListEntry.n_strx = NLE.n_strx;
+ ListEntry.n_type = NLE.n_type;
+ ListEntry.n_sect = NLE.n_sect;
+ ListEntry.n_desc = NLE.n_desc;
+ ListEntry.n_value = NLE.n_value;
+
+ if (IsLittleEndian != sys::IsLittleEndianHost)
+ MachO::swapStruct(ListEntry);
+ OS.write(reinterpret_cast<const char *>(&ListEntry), sizeof(NListType));
+}
+
+Error MachOWriter::writeLinkEditData(raw_ostream &OS) {
+ typedef Error (MachOWriter::*writeHandler)(raw_ostream &);
+ typedef std::pair<uint64_t, writeHandler> writeOperation;
+ std::vector<writeOperation> WriteQueue;
+
+ MachO::dyld_info_command *DyldInfoOnlyCmd = 0;
+ MachO::symtab_command *SymtabCmd = 0;
+ for (auto &LC : Obj.LoadCommands) {
+ switch (LC.Data.load_command_data.cmd) {
+ case MachO::LC_SYMTAB:
+ SymtabCmd = &LC.Data.symtab_command_data;
+ WriteQueue.push_back(
+ std::make_pair(SymtabCmd->symoff, &MachOWriter::writeNameList));
+ WriteQueue.push_back(
+ std::make_pair(SymtabCmd->stroff, &MachOWriter::writeStringTable));
+ break;
+ case MachO::LC_DYLD_INFO_ONLY:
+ DyldInfoOnlyCmd = &LC.Data.dyld_info_command_data;
+ WriteQueue.push_back(std::make_pair(DyldInfoOnlyCmd->rebase_off,
+ &MachOWriter::writeRebaseOpcodes));
+ WriteQueue.push_back(std::make_pair(DyldInfoOnlyCmd->bind_off,
+ &MachOWriter::writeBasicBindOpcodes));
+ WriteQueue.push_back(std::make_pair(DyldInfoOnlyCmd->weak_bind_off,
+ &MachOWriter::writeWeakBindOpcodes));
+ WriteQueue.push_back(std::make_pair(DyldInfoOnlyCmd->lazy_bind_off,
+ &MachOWriter::writeLazyBindOpcodes));
+ WriteQueue.push_back(std::make_pair(DyldInfoOnlyCmd->export_off,
+ &MachOWriter::writeExportTrie));
+ break;
+ }
+ }
+
+ llvm::sort(WriteQueue, [](const writeOperation &a, const writeOperation &b) {
+ return a.first < b.first;
+ });
+
+ for (auto writeOp : WriteQueue) {
+ ZeroToOffset(OS, writeOp.first);
+ if (auto Err = (this->*writeOp.second)(OS))
+ return Err;
+ }
+
+ return Error::success();
+}
+
+Error MachOWriter::writeRebaseOpcodes(raw_ostream &OS) {
+ MachOYAML::LinkEditData &LinkEdit = Obj.LinkEdit;
+
+ for (auto Opcode : LinkEdit.RebaseOpcodes) {
+ uint8_t OpByte = Opcode.Opcode | Opcode.Imm;
+ OS.write(reinterpret_cast<char *>(&OpByte), 1);
+ for (auto Data : Opcode.ExtraData) {
+ encodeULEB128(Data, OS);
+ }
+ }
+ return Error::success();
+}
+
+Error MachOWriter::writeBasicBindOpcodes(raw_ostream &OS) {
+ writeBindOpcodes(OS, Obj.LinkEdit.BindOpcodes);
+ return Error::success();
+}
+
+Error MachOWriter::writeWeakBindOpcodes(raw_ostream &OS) {
+ writeBindOpcodes(OS, Obj.LinkEdit.WeakBindOpcodes);
+ return Error::success();
+}
+
+Error MachOWriter::writeLazyBindOpcodes(raw_ostream &OS) {
+ writeBindOpcodes(OS, Obj.LinkEdit.LazyBindOpcodes);
+ return Error::success();
+}
+
+Error MachOWriter::writeNameList(raw_ostream &OS) {
+ for (auto NLE : Obj.LinkEdit.NameList) {
+ if (is64Bit)
+ writeNListEntry<MachO::nlist_64>(NLE, OS, Obj.IsLittleEndian);
+ else
+ writeNListEntry<MachO::nlist>(NLE, OS, Obj.IsLittleEndian);
+ }
+ return Error::success();
+}
+
+Error MachOWriter::writeStringTable(raw_ostream &OS) {
+ for (auto Str : Obj.LinkEdit.StringTable) {
+ OS.write(Str.data(), Str.size());
+ OS.write('\0');
+ }
+ return Error::success();
+}
+
+class UniversalWriter {
+public:
+ UniversalWriter(yaml::YamlObjectFile &ObjectFile)
+ : ObjectFile(ObjectFile), fileStart(0) {}
+
+ Error writeMachO(raw_ostream &OS);
+
+private:
+ Error writeFatHeader(raw_ostream &OS);
+ Error writeFatArchs(raw_ostream &OS);
+
+ void ZeroToOffset(raw_ostream &OS, size_t offset);
+
+ yaml::YamlObjectFile &ObjectFile;
+ uint64_t fileStart;
+};
+
+Error UniversalWriter::writeMachO(raw_ostream &OS) {
+ fileStart = OS.tell();
+ if (ObjectFile.MachO) {
+ MachOWriter Writer(*ObjectFile.MachO);
+ return Writer.writeMachO(OS);
+ }
+ if (auto Err = writeFatHeader(OS))
+ return Err;
+ if (auto Err = writeFatArchs(OS))
+ return Err;
+ auto &FatFile = *ObjectFile.FatMachO;
+ assert(FatFile.FatArchs.size() == FatFile.Slices.size());
+ for (size_t i = 0; i < FatFile.Slices.size(); i++) {
+ ZeroToOffset(OS, FatFile.FatArchs[i].offset);
+ MachOWriter Writer(FatFile.Slices[i]);
+ if (auto Err = Writer.writeMachO(OS))
+ return Err;
+ auto SliceEnd = FatFile.FatArchs[i].offset + FatFile.FatArchs[i].size;
+ ZeroToOffset(OS, SliceEnd);
+ }
+ return Error::success();
+}
+
+Error UniversalWriter::writeFatHeader(raw_ostream &OS) {
+ auto &FatFile = *ObjectFile.FatMachO;
+ MachO::fat_header header;
+ header.magic = FatFile.Header.magic;
+ header.nfat_arch = FatFile.Header.nfat_arch;
+ if (sys::IsLittleEndianHost)
+ swapStruct(header);
+ OS.write(reinterpret_cast<const char *>(&header), sizeof(MachO::fat_header));
+ return Error::success();
+}
+
+template <typename FatArchType>
+FatArchType constructFatArch(MachOYAML::FatArch &Arch) {
+ FatArchType FatArch;
+ FatArch.cputype = Arch.cputype;
+ FatArch.cpusubtype = Arch.cpusubtype;
+ FatArch.offset = Arch.offset;
+ FatArch.size = Arch.size;
+ FatArch.align = Arch.align;
+ return FatArch;
+}
+
+template <typename StructType>
+void writeFatArch(MachOYAML::FatArch &LC, raw_ostream &OS) {}
+
+template <>
+void writeFatArch<MachO::fat_arch>(MachOYAML::FatArch &Arch, raw_ostream &OS) {
+ auto FatArch = constructFatArch<MachO::fat_arch>(Arch);
+ if (sys::IsLittleEndianHost)
+ swapStruct(FatArch);
+ OS.write(reinterpret_cast<const char *>(&FatArch), sizeof(MachO::fat_arch));
+}
+
+template <>
+void writeFatArch<MachO::fat_arch_64>(MachOYAML::FatArch &Arch,
+ raw_ostream &OS) {
+ auto FatArch = constructFatArch<MachO::fat_arch_64>(Arch);
+ FatArch.reserved = Arch.reserved;
+ if (sys::IsLittleEndianHost)
+ swapStruct(FatArch);
+ OS.write(reinterpret_cast<const char *>(&FatArch),
+ sizeof(MachO::fat_arch_64));
+}
+
+Error UniversalWriter::writeFatArchs(raw_ostream &OS) {
+ auto &FatFile = *ObjectFile.FatMachO;
+ bool is64Bit = FatFile.Header.magic == MachO::FAT_MAGIC_64;
+ for (auto Arch : FatFile.FatArchs) {
+ if (is64Bit)
+ writeFatArch<MachO::fat_arch_64>(Arch, OS);
+ else
+ writeFatArch<MachO::fat_arch>(Arch, OS);
+ }
+
+ return Error::success();
+}
+
+void UniversalWriter::ZeroToOffset(raw_ostream &OS, size_t Offset) {
+ auto currOffset = OS.tell() - fileStart;
+ if (currOffset < Offset)
+ ZeroFillBytes(OS, Offset - currOffset);
+}
+
+} // end anonymous namespace
+
+namespace llvm {
+namespace yaml {
+
+int yaml2macho(YamlObjectFile &Doc, raw_ostream &Out) {
+ UniversalWriter Writer(Doc);
+ if (auto Err = Writer.writeMachO(Out)) {
+ errs() << toString(std::move(Err));
+ return 1;
+ }
+ return 0;
+}
+
+} // namespace yaml
+} // namespace llvm
diff --git a/llvm/lib/ObjectYAML/MinidumpEmitter.cpp b/llvm/lib/ObjectYAML/MinidumpEmitter.cpp
new file mode 100644
index 0000000..3e3a254
--- /dev/null
+++ b/llvm/lib/ObjectYAML/MinidumpEmitter.cpp
@@ -0,0 +1,24 @@
+//===- yaml2minidump.cpp - Convert a YAML file to a minidump file ---------===//
+//
+// 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/ObjectYAML/MinidumpYAML.h"
+#include "llvm/ObjectYAML/yaml2obj.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+namespace llvm {
+namespace yaml {
+
+int yaml2minidump(MinidumpYAML::Object &Doc, raw_ostream &Out) {
+ writeAsBinary(Doc, Out);
+ return 0;
+}
+
+} // namespace yaml
+} // namespace llvm
diff --git a/llvm/lib/ObjectYAML/WasmEmitter.cpp b/llvm/lib/ObjectYAML/WasmEmitter.cpp
new file mode 100644
index 0000000..5769d7b
--- /dev/null
+++ b/llvm/lib/ObjectYAML/WasmEmitter.cpp
@@ -0,0 +1,668 @@
+//===- yaml2wasm - Convert YAML to a Wasm object file --------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// The Wasm component of yaml2obj.
+///
+//===----------------------------------------------------------------------===//
+//
+
+#include "llvm/Object/Wasm.h"
+#include "llvm/ObjectYAML/ObjectYAML.h"
+#include "llvm/ObjectYAML/yaml2obj.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/LEB128.h"
+
+using namespace llvm;
+
+namespace {
+/// This parses a yaml stream that represents a Wasm object file.
+/// See docs/yaml2obj for the yaml scheema.
+class WasmWriter {
+public:
+ WasmWriter(WasmYAML::Object &Obj) : Obj(Obj) {}
+ int writeWasm(raw_ostream &OS);
+
+private:
+ int writeRelocSection(raw_ostream &OS, WasmYAML::Section &Sec,
+ uint32_t SectionIndex);
+
+ int writeSectionContent(raw_ostream &OS, WasmYAML::CustomSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::TypeSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::ImportSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::FunctionSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::TableSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::MemorySection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::GlobalSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::EventSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::ExportSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::StartSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::ElemSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::CodeSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::DataSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::DataCountSection &Section);
+
+ // Custom section types
+ int writeSectionContent(raw_ostream &OS, WasmYAML::DylinkSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::NameSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::LinkingSection &Section);
+ int writeSectionContent(raw_ostream &OS, WasmYAML::ProducersSection &Section);
+ int writeSectionContent(raw_ostream &OS,
+ WasmYAML::TargetFeaturesSection &Section);
+ WasmYAML::Object &Obj;
+ uint32_t NumImportedFunctions = 0;
+ uint32_t NumImportedGlobals = 0;
+ uint32_t NumImportedEvents = 0;
+};
+
+class SubSectionWriter {
+ raw_ostream &OS;
+ std::string OutString;
+ raw_string_ostream StringStream;
+
+public:
+ SubSectionWriter(raw_ostream &OS) : OS(OS), StringStream(OutString) {}
+
+ void done() {
+ StringStream.flush();
+ encodeULEB128(OutString.size(), OS);
+ OS << OutString;
+ OutString.clear();
+ }
+
+ raw_ostream &getStream() { return StringStream; }
+};
+
+} // end anonymous namespace
+
+static int writeUint64(raw_ostream &OS, uint64_t Value) {
+ char Data[sizeof(Value)];
+ support::endian::write64le(Data, Value);
+ OS.write(Data, sizeof(Data));
+ return 0;
+}
+
+static int writeUint32(raw_ostream &OS, uint32_t Value) {
+ char Data[sizeof(Value)];
+ support::endian::write32le(Data, Value);
+ OS.write(Data, sizeof(Data));
+ return 0;
+}
+
+static int writeUint8(raw_ostream &OS, uint8_t Value) {
+ char Data[sizeof(Value)];
+ memcpy(Data, &Value, sizeof(Data));
+ OS.write(Data, sizeof(Data));
+ return 0;
+}
+
+static int writeStringRef(const StringRef &Str, raw_ostream &OS) {
+ encodeULEB128(Str.size(), OS);
+ OS << Str;
+ return 0;
+}
+
+static int writeLimits(const WasmYAML::Limits &Lim, raw_ostream &OS) {
+ writeUint8(OS, Lim.Flags);
+ encodeULEB128(Lim.Initial, OS);
+ if (Lim.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
+ encodeULEB128(Lim.Maximum, OS);
+ return 0;
+}
+
+static int writeInitExpr(const wasm::WasmInitExpr &InitExpr, raw_ostream &OS) {
+ writeUint8(OS, InitExpr.Opcode);
+ switch (InitExpr.Opcode) {
+ case wasm::WASM_OPCODE_I32_CONST:
+ encodeSLEB128(InitExpr.Value.Int32, OS);
+ break;
+ case wasm::WASM_OPCODE_I64_CONST:
+ encodeSLEB128(InitExpr.Value.Int64, OS);
+ break;
+ case wasm::WASM_OPCODE_F32_CONST:
+ writeUint32(OS, InitExpr.Value.Float32);
+ break;
+ case wasm::WASM_OPCODE_F64_CONST:
+ writeUint64(OS, InitExpr.Value.Float64);
+ break;
+ case wasm::WASM_OPCODE_GLOBAL_GET:
+ encodeULEB128(InitExpr.Value.Global, OS);
+ break;
+ default:
+ errs() << "Unknown opcode in init_expr: " << InitExpr.Opcode << "\n";
+ return 1;
+ }
+ writeUint8(OS, wasm::WASM_OPCODE_END);
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::DylinkSection &Section) {
+ writeStringRef(Section.Name, OS);
+ encodeULEB128(Section.MemorySize, OS);
+ encodeULEB128(Section.MemoryAlignment, OS);
+ encodeULEB128(Section.TableSize, OS);
+ encodeULEB128(Section.TableAlignment, OS);
+ encodeULEB128(Section.Needed.size(), OS);
+ for (StringRef Needed : Section.Needed) {
+ writeStringRef(Needed, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::LinkingSection &Section) {
+ writeStringRef(Section.Name, OS);
+ encodeULEB128(Section.Version, OS);
+
+ SubSectionWriter SubSection(OS);
+
+ // SYMBOL_TABLE subsection
+ if (Section.SymbolTable.size()) {
+ writeUint8(OS, wasm::WASM_SYMBOL_TABLE);
+
+ encodeULEB128(Section.SymbolTable.size(), SubSection.getStream());
+#ifndef NDEBUG
+ uint32_t SymbolIndex = 0;
+#endif
+ for (const WasmYAML::SymbolInfo &Info : Section.SymbolTable) {
+ assert(Info.Index == SymbolIndex++);
+ writeUint8(SubSection.getStream(), Info.Kind);
+ encodeULEB128(Info.Flags, SubSection.getStream());
+ switch (Info.Kind) {
+ case wasm::WASM_SYMBOL_TYPE_FUNCTION:
+ case wasm::WASM_SYMBOL_TYPE_GLOBAL:
+ case wasm::WASM_SYMBOL_TYPE_EVENT:
+ encodeULEB128(Info.ElementIndex, SubSection.getStream());
+ if ((Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0 ||
+ (Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
+ writeStringRef(Info.Name, SubSection.getStream());
+ break;
+ case wasm::WASM_SYMBOL_TYPE_DATA:
+ writeStringRef(Info.Name, SubSection.getStream());
+ if ((Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0) {
+ encodeULEB128(Info.DataRef.Segment, SubSection.getStream());
+ encodeULEB128(Info.DataRef.Offset, SubSection.getStream());
+ encodeULEB128(Info.DataRef.Size, SubSection.getStream());
+ }
+ break;
+ case wasm::WASM_SYMBOL_TYPE_SECTION:
+ encodeULEB128(Info.ElementIndex, SubSection.getStream());
+ break;
+ default:
+ llvm_unreachable("unexpected kind");
+ }
+ }
+
+ SubSection.done();
+ }
+
+ // SEGMENT_NAMES subsection
+ if (Section.SegmentInfos.size()) {
+ writeUint8(OS, wasm::WASM_SEGMENT_INFO);
+ encodeULEB128(Section.SegmentInfos.size(), SubSection.getStream());
+ for (const WasmYAML::SegmentInfo &SegmentInfo : Section.SegmentInfos) {
+ writeStringRef(SegmentInfo.Name, SubSection.getStream());
+ encodeULEB128(SegmentInfo.Alignment, SubSection.getStream());
+ encodeULEB128(SegmentInfo.Flags, SubSection.getStream());
+ }
+ SubSection.done();
+ }
+
+ // INIT_FUNCS subsection
+ if (Section.InitFunctions.size()) {
+ writeUint8(OS, wasm::WASM_INIT_FUNCS);
+ encodeULEB128(Section.InitFunctions.size(), SubSection.getStream());
+ for (const WasmYAML::InitFunction &Func : Section.InitFunctions) {
+ encodeULEB128(Func.Priority, SubSection.getStream());
+ encodeULEB128(Func.Symbol, SubSection.getStream());
+ }
+ SubSection.done();
+ }
+
+ // COMDAT_INFO subsection
+ if (Section.Comdats.size()) {
+ writeUint8(OS, wasm::WASM_COMDAT_INFO);
+ encodeULEB128(Section.Comdats.size(), SubSection.getStream());
+ for (const auto &C : Section.Comdats) {
+ writeStringRef(C.Name, SubSection.getStream());
+ encodeULEB128(0, SubSection.getStream()); // flags for future use
+ encodeULEB128(C.Entries.size(), SubSection.getStream());
+ for (const WasmYAML::ComdatEntry &Entry : C.Entries) {
+ writeUint8(SubSection.getStream(), Entry.Kind);
+ encodeULEB128(Entry.Index, SubSection.getStream());
+ }
+ }
+ SubSection.done();
+ }
+
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::NameSection &Section) {
+ writeStringRef(Section.Name, OS);
+ if (Section.FunctionNames.size()) {
+ writeUint8(OS, wasm::WASM_NAMES_FUNCTION);
+
+ SubSectionWriter SubSection(OS);
+
+ encodeULEB128(Section.FunctionNames.size(), SubSection.getStream());
+ for (const WasmYAML::NameEntry &NameEntry : Section.FunctionNames) {
+ encodeULEB128(NameEntry.Index, SubSection.getStream());
+ writeStringRef(NameEntry.Name, SubSection.getStream());
+ }
+
+ SubSection.done();
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::ProducersSection &Section) {
+ writeStringRef(Section.Name, OS);
+ int Fields = int(!Section.Languages.empty()) + int(!Section.Tools.empty()) +
+ int(!Section.SDKs.empty());
+ if (Fields == 0)
+ return 0;
+ encodeULEB128(Fields, OS);
+ for (auto &Field : {std::make_pair(StringRef("language"), &Section.Languages),
+ std::make_pair(StringRef("processed-by"), &Section.Tools),
+ std::make_pair(StringRef("sdk"), &Section.SDKs)}) {
+ if (Field.second->empty())
+ continue;
+ writeStringRef(Field.first, OS);
+ encodeULEB128(Field.second->size(), OS);
+ for (auto &Entry : *Field.second) {
+ writeStringRef(Entry.Name, OS);
+ writeStringRef(Entry.Version, OS);
+ }
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::TargetFeaturesSection &Section) {
+ writeStringRef(Section.Name, OS);
+ encodeULEB128(Section.Features.size(), OS);
+ for (auto &E : Section.Features) {
+ writeUint8(OS, E.Prefix);
+ writeStringRef(E.Name, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::CustomSection &Section) {
+ if (auto S = dyn_cast<WasmYAML::DylinkSection>(&Section)) {
+ if (auto Err = writeSectionContent(OS, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::NameSection>(&Section)) {
+ if (auto Err = writeSectionContent(OS, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::LinkingSection>(&Section)) {
+ if (auto Err = writeSectionContent(OS, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::ProducersSection>(&Section)) {
+ if (auto Err = writeSectionContent(OS, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::TargetFeaturesSection>(&Section)) {
+ if (auto Err = writeSectionContent(OS, *S))
+ return Err;
+ } else {
+ writeStringRef(Section.Name, OS);
+ Section.Payload.writeAsBinary(OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::TypeSection &Section) {
+ encodeULEB128(Section.Signatures.size(), OS);
+ uint32_t ExpectedIndex = 0;
+ for (const WasmYAML::Signature &Sig : Section.Signatures) {
+ if (Sig.Index != ExpectedIndex) {
+ errs() << "Unexpected type index: " << Sig.Index << "\n";
+ return 1;
+ }
+ ++ExpectedIndex;
+ writeUint8(OS, Sig.Form);
+ encodeULEB128(Sig.ParamTypes.size(), OS);
+ for (auto ParamType : Sig.ParamTypes)
+ writeUint8(OS, ParamType);
+ if (Sig.ReturnType == wasm::WASM_TYPE_NORESULT) {
+ encodeULEB128(0, OS);
+ } else {
+ encodeULEB128(1, OS);
+ writeUint8(OS, Sig.ReturnType);
+ }
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::ImportSection &Section) {
+ encodeULEB128(Section.Imports.size(), OS);
+ for (const WasmYAML::Import &Import : Section.Imports) {
+ writeStringRef(Import.Module, OS);
+ writeStringRef(Import.Field, OS);
+ writeUint8(OS, Import.Kind);
+ switch (Import.Kind) {
+ case wasm::WASM_EXTERNAL_FUNCTION:
+ encodeULEB128(Import.SigIndex, OS);
+ NumImportedFunctions++;
+ break;
+ case wasm::WASM_EXTERNAL_GLOBAL:
+ writeUint8(OS, Import.GlobalImport.Type);
+ writeUint8(OS, Import.GlobalImport.Mutable);
+ NumImportedGlobals++;
+ break;
+ case wasm::WASM_EXTERNAL_EVENT:
+ writeUint32(OS, Import.EventImport.Attribute);
+ writeUint32(OS, Import.EventImport.SigIndex);
+ NumImportedGlobals++;
+ break;
+ case wasm::WASM_EXTERNAL_MEMORY:
+ writeLimits(Import.Memory, OS);
+ break;
+ case wasm::WASM_EXTERNAL_TABLE:
+ writeUint8(OS, Import.TableImport.ElemType);
+ writeLimits(Import.TableImport.TableLimits, OS);
+ break;
+ default:
+ errs() << "Unknown import type: " << Import.Kind << "\n";
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::FunctionSection &Section) {
+ encodeULEB128(Section.FunctionTypes.size(), OS);
+ for (uint32_t FuncType : Section.FunctionTypes) {
+ encodeULEB128(FuncType, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::ExportSection &Section) {
+ encodeULEB128(Section.Exports.size(), OS);
+ for (const WasmYAML::Export &Export : Section.Exports) {
+ writeStringRef(Export.Name, OS);
+ writeUint8(OS, Export.Kind);
+ encodeULEB128(Export.Index, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::StartSection &Section) {
+ encodeULEB128(Section.StartFunction, OS);
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::TableSection &Section) {
+ encodeULEB128(Section.Tables.size(), OS);
+ for (auto &Table : Section.Tables) {
+ writeUint8(OS, Table.ElemType);
+ writeLimits(Table.TableLimits, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::MemorySection &Section) {
+ encodeULEB128(Section.Memories.size(), OS);
+ for (const WasmYAML::Limits &Mem : Section.Memories) {
+ writeLimits(Mem, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::GlobalSection &Section) {
+ encodeULEB128(Section.Globals.size(), OS);
+ uint32_t ExpectedIndex = NumImportedGlobals;
+ for (auto &Global : Section.Globals) {
+ if (Global.Index != ExpectedIndex) {
+ errs() << "Unexpected global index: " << Global.Index << "\n";
+ return 1;
+ }
+ ++ExpectedIndex;
+ writeUint8(OS, Global.Type);
+ writeUint8(OS, Global.Mutable);
+ writeInitExpr(Global.InitExpr, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::EventSection &Section) {
+ encodeULEB128(Section.Events.size(), OS);
+ uint32_t ExpectedIndex = NumImportedEvents;
+ for (auto &Event : Section.Events) {
+ if (Event.Index != ExpectedIndex) {
+ errs() << "Unexpected event index: " << Event.Index << "\n";
+ return 1;
+ }
+ ++ExpectedIndex;
+ encodeULEB128(Event.Attribute, OS);
+ encodeULEB128(Event.SigIndex, OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::ElemSection &Section) {
+ encodeULEB128(Section.Segments.size(), OS);
+ for (auto &Segment : Section.Segments) {
+ encodeULEB128(Segment.TableIndex, OS);
+ writeInitExpr(Segment.Offset, OS);
+
+ encodeULEB128(Segment.Functions.size(), OS);
+ for (auto &Function : Segment.Functions) {
+ encodeULEB128(Function, OS);
+ }
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::CodeSection &Section) {
+ encodeULEB128(Section.Functions.size(), OS);
+ uint32_t ExpectedIndex = NumImportedFunctions;
+ for (auto &Func : Section.Functions) {
+ std::string OutString;
+ raw_string_ostream StringStream(OutString);
+ if (Func.Index != ExpectedIndex) {
+ errs() << "Unexpected function index: " << Func.Index << "\n";
+ return 1;
+ }
+ ++ExpectedIndex;
+
+ encodeULEB128(Func.Locals.size(), StringStream);
+ for (auto &LocalDecl : Func.Locals) {
+ encodeULEB128(LocalDecl.Count, StringStream);
+ writeUint8(StringStream, LocalDecl.Type);
+ }
+
+ Func.Body.writeAsBinary(StringStream);
+
+ // Write the section size followed by the content
+ StringStream.flush();
+ encodeULEB128(OutString.size(), OS);
+ OS << OutString;
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::DataSection &Section) {
+ encodeULEB128(Section.Segments.size(), OS);
+ for (auto &Segment : Section.Segments) {
+ encodeULEB128(Segment.InitFlags, OS);
+ if (Segment.InitFlags & wasm::WASM_SEGMENT_HAS_MEMINDEX)
+ encodeULEB128(Segment.MemoryIndex, OS);
+ if ((Segment.InitFlags & wasm::WASM_SEGMENT_IS_PASSIVE) == 0)
+ writeInitExpr(Segment.Offset, OS);
+ encodeULEB128(Segment.Content.binary_size(), OS);
+ Segment.Content.writeAsBinary(OS);
+ }
+ return 0;
+}
+
+int WasmWriter::writeSectionContent(raw_ostream &OS,
+ WasmYAML::DataCountSection &Section) {
+ encodeULEB128(Section.Count, OS);
+ return 0;
+}
+
+int WasmWriter::writeRelocSection(raw_ostream &OS, WasmYAML::Section &Sec,
+ uint32_t SectionIndex) {
+ switch (Sec.Type) {
+ case wasm::WASM_SEC_CODE:
+ writeStringRef("reloc.CODE", OS);
+ break;
+ case wasm::WASM_SEC_DATA:
+ writeStringRef("reloc.DATA", OS);
+ break;
+ case wasm::WASM_SEC_CUSTOM: {
+ auto CustomSection = dyn_cast<WasmYAML::CustomSection>(&Sec);
+ writeStringRef(("reloc." + CustomSection->Name).str(), OS);
+ break;
+ }
+ default:
+ llvm_unreachable("not yet implemented");
+ return 1;
+ }
+
+ encodeULEB128(SectionIndex, OS);
+ encodeULEB128(Sec.Relocations.size(), OS);
+
+ for (auto Reloc : Sec.Relocations) {
+ writeUint8(OS, Reloc.Type);
+ encodeULEB128(Reloc.Offset, OS);
+ encodeULEB128(Reloc.Index, OS);
+ switch (Reloc.Type) {
+ case wasm::R_WASM_MEMORY_ADDR_LEB:
+ case wasm::R_WASM_MEMORY_ADDR_SLEB:
+ case wasm::R_WASM_MEMORY_ADDR_I32:
+ case wasm::R_WASM_FUNCTION_OFFSET_I32:
+ case wasm::R_WASM_SECTION_OFFSET_I32:
+ encodeULEB128(Reloc.Addend, OS);
+ }
+ }
+ return 0;
+}
+
+int WasmWriter::writeWasm(raw_ostream &OS) {
+ // Write headers
+ OS.write(wasm::WasmMagic, sizeof(wasm::WasmMagic));
+ writeUint32(OS, Obj.Header.Version);
+
+ // Write each section
+ llvm::object::WasmSectionOrderChecker Checker;
+ for (const std::unique_ptr<WasmYAML::Section> &Sec : Obj.Sections) {
+ StringRef SecName = "";
+ if (auto S = dyn_cast<WasmYAML::CustomSection>(Sec.get()))
+ SecName = S->Name;
+ if (!Checker.isValidSectionOrder(Sec->Type, SecName)) {
+ errs() << "Out of order section type: " << Sec->Type << "\n";
+ return 1;
+ }
+ encodeULEB128(Sec->Type, OS);
+ std::string OutString;
+ raw_string_ostream StringStream(OutString);
+ if (auto S = dyn_cast<WasmYAML::CustomSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::TypeSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::ImportSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::FunctionSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::TableSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::MemorySection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::GlobalSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::EventSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::ExportSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::StartSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::ElemSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::CodeSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::DataSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else if (auto S = dyn_cast<WasmYAML::DataCountSection>(Sec.get())) {
+ if (auto Err = writeSectionContent(StringStream, *S))
+ return Err;
+ } else {
+ errs() << "Unknown section type: " << Sec->Type << "\n";
+ return 1;
+ }
+ StringStream.flush();
+
+ // Write the section size followed by the content
+ encodeULEB128(OutString.size(), OS);
+ OS << OutString;
+ }
+
+ // write reloc sections for any section that have relocations
+ uint32_t SectionIndex = 0;
+ for (const std::unique_ptr<WasmYAML::Section> &Sec : Obj.Sections) {
+ if (Sec->Relocations.empty()) {
+ SectionIndex++;
+ continue;
+ }
+
+ writeUint8(OS, wasm::WASM_SEC_CUSTOM);
+ std::string OutString;
+ raw_string_ostream StringStream(OutString);
+ writeRelocSection(StringStream, *Sec, SectionIndex++);
+ StringStream.flush();
+
+ encodeULEB128(OutString.size(), OS);
+ OS << OutString;
+ }
+
+ return 0;
+}
+
+namespace llvm {
+namespace yaml {
+
+int yaml2wasm(WasmYAML::Object &Doc, raw_ostream &Out) {
+ WasmWriter Writer(Doc);
+
+ return Writer.writeWasm(Out);
+}
+
+} // namespace yaml
+} // namespace llvm
diff --git a/llvm/lib/ObjectYAML/yaml2obj.cpp b/llvm/lib/ObjectYAML/yaml2obj.cpp
new file mode 100644
index 0000000..f9bcba6
--- /dev/null
+++ b/llvm/lib/ObjectYAML/yaml2obj.cpp
@@ -0,0 +1,68 @@
+//===-- yaml2obj.cpp ------------------------------------------------------===//
+//
+// 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/ObjectYAML/yaml2obj.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/ObjectYAML/ObjectYAML.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/YAMLTraits.h"
+
+namespace llvm {
+namespace yaml {
+
+Error convertYAML(yaml::Input &YIn, raw_ostream &Out, unsigned DocNum) {
+ // TODO: make yaml2* functions return Error instead of int.
+ auto IntToErr = [](int Ret) -> Error {
+ if (Ret)
+ return createStringError(errc::invalid_argument, "yaml2obj failed");
+ return Error::success();
+ };
+
+ unsigned CurDocNum = 0;
+ do {
+ if (++CurDocNum == DocNum) {
+ yaml::YamlObjectFile Doc;
+ YIn >> Doc;
+ if (std::error_code EC = YIn.error())
+ return createStringError(EC, "Failed to parse YAML input!");
+ if (Doc.Elf)
+ return IntToErr(yaml2elf(*Doc.Elf, Out));
+ if (Doc.Coff)
+ return IntToErr(yaml2coff(*Doc.Coff, Out));
+ if (Doc.MachO || Doc.FatMachO)
+ return IntToErr(yaml2macho(Doc, Out));
+ if (Doc.Minidump)
+ return IntToErr(yaml2minidump(*Doc.Minidump, Out));
+ if (Doc.Wasm)
+ return IntToErr(yaml2wasm(*Doc.Wasm, Out));
+ return createStringError(errc::invalid_argument,
+ "Unknown document type!");
+ }
+ } while (YIn.nextDocument());
+
+ return createStringError(errc::invalid_argument,
+ "Cannot find the %u%s document", DocNum,
+ getOrdinalSuffix(DocNum).data());
+}
+
+Expected<std::unique_ptr<object::ObjectFile>>
+yaml2ObjectFile(SmallVectorImpl<char> &Storage, StringRef Yaml) {
+ Storage.clear();
+ raw_svector_ostream OS(Storage);
+
+ yaml::Input YIn(Yaml);
+ if (Error E = convertYAML(YIn, OS))
+ return std::move(E);
+
+ return object::ObjectFile::createObjectFile(
+ MemoryBufferRef(OS.str(), "YamlObject"));
+}
+
+} // namespace yaml
+} // namespace llvm