forked from OSchip/llvm-project
563 lines
20 KiB
C++
563 lines
20 KiB
C++
//===- yaml2coff - Convert YAML to a COFF object file ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief The COFF component of yaml2obj.
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///
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//===----------------------------------------------------------------------===//
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#include "yaml2obj.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/ObjectYAML/COFFYAML.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include <vector>
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using namespace llvm;
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/// This parses a yaml stream that represents a COFF object file.
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/// See docs/yaml2obj for the yaml scheema.
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struct COFFParser {
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COFFParser(COFFYAML::Object &Obj)
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: Obj(Obj), SectionTableStart(0), SectionTableSize(0) {
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// A COFF string table always starts with a 4 byte size field. Offsets into
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// it include this size, so allocate it now.
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StringTable.append(4, char(0));
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}
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bool useBigObj() const {
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return static_cast<int32_t>(Obj.Sections.size()) >
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COFF::MaxNumberOfSections16;
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}
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bool isPE() const { return Obj.OptionalHeader.hasValue(); }
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bool is64Bit() const {
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return Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64;
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}
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uint32_t getFileAlignment() const {
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return Obj.OptionalHeader->Header.FileAlignment;
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}
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unsigned getHeaderSize() const {
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return useBigObj() ? COFF::Header32Size : COFF::Header16Size;
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}
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unsigned getSymbolSize() const {
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return useBigObj() ? COFF::Symbol32Size : COFF::Symbol16Size;
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}
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bool parseSections() {
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for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(),
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e = Obj.Sections.end(); i != e; ++i) {
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COFFYAML::Section &Sec = *i;
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// If the name is less than 8 bytes, store it in place, otherwise
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// store it in the string table.
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StringRef Name = Sec.Name;
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if (Name.size() <= COFF::NameSize) {
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std::copy(Name.begin(), Name.end(), Sec.Header.Name);
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} else {
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// Add string to the string table and format the index for output.
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unsigned Index = getStringIndex(Name);
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std::string str = utostr(Index);
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if (str.size() > 7) {
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errs() << "String table got too large\n";
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return false;
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}
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Sec.Header.Name[0] = '/';
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std::copy(str.begin(), str.end(), Sec.Header.Name + 1);
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}
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if (Sec.Alignment) {
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if (Sec.Alignment > 8192) {
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errs() << "Section alignment is too large\n";
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return false;
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}
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if (!isPowerOf2_32(Sec.Alignment)) {
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errs() << "Section alignment is not a power of 2\n";
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return false;
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}
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Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20;
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}
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}
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return true;
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}
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bool parseSymbols() {
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for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(),
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e = Obj.Symbols.end(); i != e; ++i) {
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COFFYAML::Symbol &Sym = *i;
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// If the name is less than 8 bytes, store it in place, otherwise
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// store it in the string table.
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StringRef Name = Sym.Name;
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if (Name.size() <= COFF::NameSize) {
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std::copy(Name.begin(), Name.end(), Sym.Header.Name);
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} else {
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// Add string to the string table and format the index for output.
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unsigned Index = getStringIndex(Name);
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*reinterpret_cast<support::aligned_ulittle32_t*>(
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Sym.Header.Name + 4) = Index;
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}
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Sym.Header.Type = Sym.SimpleType;
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Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT;
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}
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return true;
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}
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bool parse() {
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if (!parseSections())
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return false;
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if (!parseSymbols())
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return false;
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return true;
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}
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unsigned getStringIndex(StringRef Str) {
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StringMap<unsigned>::iterator i = StringTableMap.find(Str);
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if (i == StringTableMap.end()) {
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unsigned Index = StringTable.size();
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StringTable.append(Str.begin(), Str.end());
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StringTable.push_back(0);
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StringTableMap[Str] = Index;
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return Index;
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}
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return i->second;
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}
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COFFYAML::Object &Obj;
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StringMap<unsigned> StringTableMap;
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std::string StringTable;
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uint32_t SectionTableStart;
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uint32_t SectionTableSize;
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};
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// Take a CP and assign addresses and sizes to everything. Returns false if the
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// layout is not valid to do.
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static bool layoutOptionalHeader(COFFParser &CP) {
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if (!CP.isPE())
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return true;
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unsigned PEHeaderSize = CP.is64Bit() ? sizeof(object::pe32plus_header)
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: sizeof(object::pe32_header);
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CP.Obj.Header.SizeOfOptionalHeader =
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PEHeaderSize +
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sizeof(object::data_directory) * (COFF::NUM_DATA_DIRECTORIES + 1);
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return true;
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}
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namespace {
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enum { DOSStubSize = 128 };
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}
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// Take a CP and assign addresses and sizes to everything. Returns false if the
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// layout is not valid to do.
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static bool layoutCOFF(COFFParser &CP) {
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// The section table starts immediately after the header, including the
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// optional header.
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CP.SectionTableStart =
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CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader;
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if (CP.isPE())
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CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic);
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CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size();
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uint32_t CurrentSectionDataOffset =
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CP.SectionTableStart + CP.SectionTableSize;
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// Assign each section data address consecutively.
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for (COFFYAML::Section &S : CP.Obj.Sections) {
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if (S.SectionData.binary_size() > 0) {
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CurrentSectionDataOffset = alignTo(CurrentSectionDataOffset,
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CP.isPE() ? CP.getFileAlignment() : 4);
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S.Header.SizeOfRawData = S.SectionData.binary_size();
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if (CP.isPE())
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S.Header.SizeOfRawData =
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alignTo(S.Header.SizeOfRawData, CP.getFileAlignment());
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S.Header.PointerToRawData = CurrentSectionDataOffset;
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CurrentSectionDataOffset += S.Header.SizeOfRawData;
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if (!S.Relocations.empty()) {
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S.Header.PointerToRelocations = CurrentSectionDataOffset;
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S.Header.NumberOfRelocations = S.Relocations.size();
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CurrentSectionDataOffset +=
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S.Header.NumberOfRelocations * COFF::RelocationSize;
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}
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} else {
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S.Header.SizeOfRawData = 0;
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S.Header.PointerToRawData = 0;
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}
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}
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uint32_t SymbolTableStart = CurrentSectionDataOffset;
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// Calculate number of symbols.
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uint32_t NumberOfSymbols = 0;
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for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(),
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e = CP.Obj.Symbols.end();
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i != e; ++i) {
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uint32_t NumberOfAuxSymbols = 0;
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if (i->FunctionDefinition)
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NumberOfAuxSymbols += 1;
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if (i->bfAndefSymbol)
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NumberOfAuxSymbols += 1;
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if (i->WeakExternal)
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NumberOfAuxSymbols += 1;
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if (!i->File.empty())
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NumberOfAuxSymbols +=
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(i->File.size() + CP.getSymbolSize() - 1) / CP.getSymbolSize();
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if (i->SectionDefinition)
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NumberOfAuxSymbols += 1;
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if (i->CLRToken)
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NumberOfAuxSymbols += 1;
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i->Header.NumberOfAuxSymbols = NumberOfAuxSymbols;
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NumberOfSymbols += 1 + NumberOfAuxSymbols;
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}
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// Store all the allocated start addresses in the header.
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CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size();
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CP.Obj.Header.NumberOfSymbols = NumberOfSymbols;
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if (NumberOfSymbols > 0 || CP.StringTable.size() > 4)
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CP.Obj.Header.PointerToSymbolTable = SymbolTableStart;
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else
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CP.Obj.Header.PointerToSymbolTable = 0;
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*reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0])
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= CP.StringTable.size();
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return true;
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}
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template <typename value_type>
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struct binary_le_impl {
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value_type Value;
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binary_le_impl(value_type V) : Value(V) {}
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};
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template <typename value_type>
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raw_ostream &operator <<( raw_ostream &OS
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, const binary_le_impl<value_type> &BLE) {
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char Buffer[sizeof(BLE.Value)];
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support::endian::write<value_type, support::little, support::unaligned>(
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Buffer, BLE.Value);
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OS.write(Buffer, sizeof(BLE.Value));
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return OS;
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}
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template <typename value_type>
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binary_le_impl<value_type> binary_le(value_type V) {
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return binary_le_impl<value_type>(V);
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}
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template <size_t NumBytes> struct zeros_impl {};
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template <size_t NumBytes>
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raw_ostream &operator<<(raw_ostream &OS, const zeros_impl<NumBytes> &) {
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char Buffer[NumBytes];
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memset(Buffer, 0, sizeof(Buffer));
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OS.write(Buffer, sizeof(Buffer));
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return OS;
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}
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template <typename T>
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zeros_impl<sizeof(T)> zeros(const T &) {
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return zeros_impl<sizeof(T)>();
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}
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struct num_zeros_impl {
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size_t N;
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num_zeros_impl(size_t N) : N(N) {}
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};
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raw_ostream &operator<<(raw_ostream &OS, const num_zeros_impl &NZI) {
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for (size_t I = 0; I != NZI.N; ++I)
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OS.write(0);
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return OS;
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}
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static num_zeros_impl num_zeros(size_t N) {
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num_zeros_impl NZI(N);
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return NZI;
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}
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template <typename T>
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static uint32_t initializeOptionalHeader(COFFParser &CP, uint16_t Magic, T Header) {
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memset(Header, 0, sizeof(*Header));
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Header->Magic = Magic;
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Header->SectionAlignment = CP.Obj.OptionalHeader->Header.SectionAlignment;
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Header->FileAlignment = CP.Obj.OptionalHeader->Header.FileAlignment;
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uint32_t SizeOfCode = 0, SizeOfInitializedData = 0,
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SizeOfUninitializedData = 0;
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uint32_t SizeOfHeaders = alignTo(CP.SectionTableStart + CP.SectionTableSize,
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Header->FileAlignment);
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uint32_t SizeOfImage = alignTo(SizeOfHeaders, Header->SectionAlignment);
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uint32_t BaseOfData = 0;
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for (const COFFYAML::Section &S : CP.Obj.Sections) {
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if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_CODE)
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SizeOfCode += S.Header.SizeOfRawData;
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if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
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SizeOfInitializedData += S.Header.SizeOfRawData;
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if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
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SizeOfUninitializedData += S.Header.SizeOfRawData;
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if (S.Name.equals(".text"))
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Header->BaseOfCode = S.Header.VirtualAddress; // RVA
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else if (S.Name.equals(".data"))
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BaseOfData = S.Header.VirtualAddress; // RVA
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if (S.Header.VirtualAddress)
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SizeOfImage += alignTo(S.Header.VirtualSize, Header->SectionAlignment);
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}
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Header->SizeOfCode = SizeOfCode;
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Header->SizeOfInitializedData = SizeOfInitializedData;
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Header->SizeOfUninitializedData = SizeOfUninitializedData;
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Header->AddressOfEntryPoint =
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CP.Obj.OptionalHeader->Header.AddressOfEntryPoint; // RVA
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Header->ImageBase = CP.Obj.OptionalHeader->Header.ImageBase;
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Header->MajorOperatingSystemVersion =
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CP.Obj.OptionalHeader->Header.MajorOperatingSystemVersion;
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Header->MinorOperatingSystemVersion =
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CP.Obj.OptionalHeader->Header.MinorOperatingSystemVersion;
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Header->MajorImageVersion =
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CP.Obj.OptionalHeader->Header.MajorImageVersion;
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Header->MinorImageVersion =
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CP.Obj.OptionalHeader->Header.MinorImageVersion;
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Header->MajorSubsystemVersion =
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CP.Obj.OptionalHeader->Header.MajorSubsystemVersion;
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Header->MinorSubsystemVersion =
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CP.Obj.OptionalHeader->Header.MinorSubsystemVersion;
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Header->SizeOfImage = SizeOfImage;
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Header->SizeOfHeaders = SizeOfHeaders;
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Header->Subsystem = CP.Obj.OptionalHeader->Header.Subsystem;
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Header->DLLCharacteristics = CP.Obj.OptionalHeader->Header.DLLCharacteristics;
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Header->SizeOfStackReserve = CP.Obj.OptionalHeader->Header.SizeOfStackReserve;
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Header->SizeOfStackCommit = CP.Obj.OptionalHeader->Header.SizeOfStackCommit;
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Header->SizeOfHeapReserve = CP.Obj.OptionalHeader->Header.SizeOfHeapReserve;
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Header->SizeOfHeapCommit = CP.Obj.OptionalHeader->Header.SizeOfHeapCommit;
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Header->NumberOfRvaAndSize = COFF::NUM_DATA_DIRECTORIES + 1;
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return BaseOfData;
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}
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static bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
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if (CP.isPE()) {
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// PE files start with a DOS stub.
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object::dos_header DH;
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memset(&DH, 0, sizeof(DH));
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// DOS EXEs start with "MZ" magic.
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DH.Magic[0] = 'M';
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DH.Magic[1] = 'Z';
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// Initializing the AddressOfRelocationTable is strictly optional but
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// mollifies certain tools which expect it to have a value greater than
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// 0x40.
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DH.AddressOfRelocationTable = sizeof(DH);
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// This is the address of the PE signature.
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DH.AddressOfNewExeHeader = DOSStubSize;
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// Write out our DOS stub.
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OS.write(reinterpret_cast<char *>(&DH), sizeof(DH));
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// Write padding until we reach the position of where our PE signature
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// should live.
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OS << num_zeros(DOSStubSize - sizeof(DH));
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// Write out the PE signature.
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OS.write(COFF::PEMagic, sizeof(COFF::PEMagic));
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}
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if (CP.useBigObj()) {
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OS << binary_le(static_cast<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN))
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<< binary_le(static_cast<uint16_t>(0xffff))
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<< binary_le(static_cast<uint16_t>(COFF::BigObjHeader::MinBigObjectVersion))
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<< binary_le(CP.Obj.Header.Machine)
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<< binary_le(CP.Obj.Header.TimeDateStamp);
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OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic));
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OS << zeros(uint32_t(0))
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<< zeros(uint32_t(0))
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<< zeros(uint32_t(0))
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<< zeros(uint32_t(0))
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<< binary_le(CP.Obj.Header.NumberOfSections)
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<< binary_le(CP.Obj.Header.PointerToSymbolTable)
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<< binary_le(CP.Obj.Header.NumberOfSymbols);
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} else {
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OS << binary_le(CP.Obj.Header.Machine)
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<< binary_le(static_cast<int16_t>(CP.Obj.Header.NumberOfSections))
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<< binary_le(CP.Obj.Header.TimeDateStamp)
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<< binary_le(CP.Obj.Header.PointerToSymbolTable)
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<< binary_le(CP.Obj.Header.NumberOfSymbols)
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<< binary_le(CP.Obj.Header.SizeOfOptionalHeader)
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<< binary_le(CP.Obj.Header.Characteristics);
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}
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if (CP.isPE()) {
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if (CP.is64Bit()) {
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object::pe32plus_header PEH;
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initializeOptionalHeader(CP, COFF::PE32Header::PE32_PLUS, &PEH);
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OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
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} else {
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object::pe32_header PEH;
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uint32_t BaseOfData = initializeOptionalHeader(CP, COFF::PE32Header::PE32, &PEH);
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PEH.BaseOfData = BaseOfData;
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OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
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}
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for (const Optional<COFF::DataDirectory> &DD :
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CP.Obj.OptionalHeader->DataDirectories) {
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if (!DD.hasValue()) {
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OS << zeros(uint32_t(0));
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OS << zeros(uint32_t(0));
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} else {
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OS << binary_le(DD->RelativeVirtualAddress);
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OS << binary_le(DD->Size);
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}
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}
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OS << zeros(uint32_t(0));
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OS << zeros(uint32_t(0));
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}
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assert(OS.tell() == CP.SectionTableStart);
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// Output section table.
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for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
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e = CP.Obj.Sections.end();
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i != e; ++i) {
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OS.write(i->Header.Name, COFF::NameSize);
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OS << binary_le(i->Header.VirtualSize)
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<< binary_le(i->Header.VirtualAddress)
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<< binary_le(i->Header.SizeOfRawData)
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<< binary_le(i->Header.PointerToRawData)
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<< binary_le(i->Header.PointerToRelocations)
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<< binary_le(i->Header.PointerToLineNumbers)
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<< binary_le(i->Header.NumberOfRelocations)
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<< binary_le(i->Header.NumberOfLineNumbers)
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<< binary_le(i->Header.Characteristics);
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}
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assert(OS.tell() == CP.SectionTableStart + CP.SectionTableSize);
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unsigned CurSymbol = 0;
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StringMap<unsigned> SymbolTableIndexMap;
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for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(),
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E = CP.Obj.Symbols.end();
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I != E; ++I) {
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SymbolTableIndexMap[I->Name] = CurSymbol;
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CurSymbol += 1 + I->Header.NumberOfAuxSymbols;
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}
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// Output section data.
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for (const COFFYAML::Section &S : CP.Obj.Sections) {
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if (!S.Header.SizeOfRawData)
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continue;
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assert(S.Header.PointerToRawData >= OS.tell());
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OS << num_zeros(S.Header.PointerToRawData - OS.tell());
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S.SectionData.writeAsBinary(OS);
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assert(S.Header.SizeOfRawData >= S.SectionData.binary_size());
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OS << num_zeros(S.Header.SizeOfRawData - S.SectionData.binary_size());
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for (const COFFYAML::Relocation &R : S.Relocations) {
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uint32_t SymbolTableIndex = SymbolTableIndexMap[R.SymbolName];
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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)
|
|
<< num_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)
|
|
<< num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
|
|
if (i->WeakExternal)
|
|
OS << binary_le(i->WeakExternal->TagIndex)
|
|
<< binary_le(i->WeakExternal->Characteristics)
|
|
<< zeros(i->WeakExternal->unused)
|
|
<< num_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 << num_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))
|
|
<< num_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)
|
|
<< num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
|
|
}
|
|
|
|
// Output string table.
|
|
if (CP.Obj.Header.PointerToSymbolTable)
|
|
OS.write(&CP.StringTable[0], CP.StringTable.size());
|
|
return true;
|
|
}
|
|
|
|
int yaml2coff(yaml::Input &YIn, raw_ostream &Out) {
|
|
COFFYAML::Object Doc;
|
|
YIn >> Doc;
|
|
if (YIn.error()) {
|
|
errs() << "yaml2obj: Failed to parse YAML file!\n";
|
|
return 1;
|
|
}
|
|
|
|
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;
|
|
}
|