mirror of
https://github.com/RPCS3/llvm-mirror.git
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45ad72aa8e
This commit adds round tripping for MachO symbol data. Symbols are entries in the name list, that contain offsets into the string table which is at the end of the __LINKEDIT segment. llvm-svn: 271604
496 lines
17 KiB
C++
496 lines
17 KiB
C++
//===------ macho2yaml.cpp - obj2yaml conversion tool -----------*- C++ -*-===//
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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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#include "Error.h"
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#include "obj2yaml.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/ObjectYAML/MachOYAML.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LEB128.h"
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#include <string.h> // for memcpy
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using namespace llvm;
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class MachODumper {
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template <typename StructType>
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const char *processLoadCommandData(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd);
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const object::MachOObjectFile &Obj;
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void dumpHeader(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpLoadCommands(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpLinkEdit(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpRebaseOpcodes(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpBindOpcodes(std::vector<MachOYAML::BindOpcode> &BindOpcodes,
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ArrayRef<uint8_t> OpcodeBuffer, bool Lazy = false);
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void dumpExportTrie(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpSymbols(std::unique_ptr<MachOYAML::Object> &Y);
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public:
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MachODumper(const object::MachOObjectFile &O) : Obj(O) {}
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Expected<std::unique_ptr<MachOYAML::Object>> dump();
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};
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#define HANDLE_LOAD_COMMAND(LCName, LCValue, LCStruct) \
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case MachO::LCName: \
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memcpy((void *) & (LC.Data.LCStruct##_data), LoadCmd.Ptr, \
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sizeof(MachO::LCStruct)); \
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if (Obj.isLittleEndian() != sys::IsLittleEndianHost) \
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MachO::swapStruct(LC.Data.LCStruct##_data); \
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EndPtr = processLoadCommandData<MachO::LCStruct>(LC, LoadCmd); \
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break;
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template <typename SectionType>
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MachOYAML::Section constructSectionCommon(SectionType Sec) {
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MachOYAML::Section TempSec;
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memcpy(reinterpret_cast<void *>(&TempSec.sectname[0]), &Sec.sectname[0], 16);
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memcpy(reinterpret_cast<void *>(&TempSec.segname[0]), &Sec.segname[0], 16);
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TempSec.addr = Sec.addr;
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TempSec.size = Sec.size;
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TempSec.offset = Sec.offset;
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TempSec.align = Sec.align;
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TempSec.reloff = Sec.reloff;
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TempSec.nreloc = Sec.nreloc;
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TempSec.flags = Sec.flags;
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TempSec.reserved1 = Sec.reserved1;
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TempSec.reserved2 = Sec.reserved2;
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TempSec.reserved3 = 0;
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return TempSec;
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}
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template <typename SectionType>
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MachOYAML::Section constructSection(SectionType Sec);
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template <> MachOYAML::Section constructSection(MachO::section Sec) {
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MachOYAML::Section TempSec = constructSectionCommon(Sec);
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TempSec.reserved3 = 0;
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return TempSec;
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}
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template <> MachOYAML::Section constructSection(MachO::section_64 Sec) {
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MachOYAML::Section TempSec = constructSectionCommon(Sec);
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TempSec.reserved3 = Sec.reserved3;
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return TempSec;
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}
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template <typename SectionType, typename SegmentType>
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const char *
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extractSections(const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd,
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std::vector<MachOYAML::Section> &Sections,
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bool IsLittleEndian) {
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auto End = LoadCmd.Ptr + LoadCmd.C.cmdsize;
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const SectionType *Curr =
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reinterpret_cast<const SectionType *>(LoadCmd.Ptr + sizeof(SegmentType));
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for (; reinterpret_cast<const void *>(Curr) < End; Curr++) {
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if (IsLittleEndian != sys::IsLittleEndianHost) {
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SectionType Sec;
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memcpy((void *)&Sec, Curr, sizeof(SectionType));
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MachO::swapStruct(Sec);
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Sections.push_back(constructSection(Sec));
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} else {
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Sections.push_back(constructSection(*Curr));
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}
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}
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return reinterpret_cast<const char *>(Curr);
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}
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template <typename StructType>
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const char *MachODumper::processLoadCommandData(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return LoadCmd.Ptr + sizeof(StructType);
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::segment_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return extractSections<MachO::section, MachO::segment_command>(
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LoadCmd, LC.Sections, Obj.isLittleEndian());
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::segment_command_64>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return extractSections<MachO::section_64, MachO::segment_command_64>(
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LoadCmd, LC.Sections, Obj.isLittleEndian());
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}
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template <typename StructType>
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const char *
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readString(MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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auto Start = LoadCmd.Ptr + sizeof(StructType);
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auto MaxSize = LoadCmd.C.cmdsize - sizeof(StructType);
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auto Size = strnlen(Start, MaxSize);
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LC.PayloadString = StringRef(Start, Size).str();
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return Start + Size;
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::dylib_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return readString<MachO::dylib_command>(LC, LoadCmd);
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::dylinker_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return readString<MachO::dylinker_command>(LC, LoadCmd);
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::rpath_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return readString<MachO::rpath_command>(LC, LoadCmd);
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}
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Expected<std::unique_ptr<MachOYAML::Object>> MachODumper::dump() {
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auto Y = make_unique<MachOYAML::Object>();
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dumpHeader(Y);
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dumpLoadCommands(Y);
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dumpLinkEdit(Y);
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return std::move(Y);
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}
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void MachODumper::dumpHeader(std::unique_ptr<MachOYAML::Object> &Y) {
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Y->Header.magic = Obj.getHeader().magic;
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Y->Header.cputype = Obj.getHeader().cputype;
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Y->Header.cpusubtype = Obj.getHeader().cpusubtype;
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Y->Header.filetype = Obj.getHeader().filetype;
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Y->Header.ncmds = Obj.getHeader().ncmds;
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Y->Header.sizeofcmds = Obj.getHeader().sizeofcmds;
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Y->Header.flags = Obj.getHeader().flags;
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Y->Header.reserved = 0;
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}
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void MachODumper::dumpLoadCommands(std::unique_ptr<MachOYAML::Object> &Y) {
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for (auto LoadCmd : Obj.load_commands()) {
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MachOYAML::LoadCommand LC;
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const char *EndPtr = LoadCmd.Ptr;
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switch (LoadCmd.C.cmd) {
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default:
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memcpy((void *)&(LC.Data.load_command_data), LoadCmd.Ptr,
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sizeof(MachO::load_command));
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if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
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MachO::swapStruct(LC.Data.load_command_data);
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EndPtr = processLoadCommandData<MachO::load_command>(LC, LoadCmd);
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break;
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#include "llvm/Support/MachO.def"
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}
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auto RemainingBytes = LoadCmd.C.cmdsize - (EndPtr - LoadCmd.Ptr);
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if (!std::all_of(EndPtr, &EndPtr[RemainingBytes],
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[](const char C) { return C == 0; })) {
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LC.PayloadBytes.insert(LC.PayloadBytes.end(), EndPtr,
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&EndPtr[RemainingBytes]);
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RemainingBytes = 0;
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}
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LC.ZeroPadBytes = RemainingBytes;
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Y->LoadCommands.push_back(std::move(LC));
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}
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}
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void MachODumper::dumpLinkEdit(std::unique_ptr<MachOYAML::Object> &Y) {
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dumpRebaseOpcodes(Y);
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dumpBindOpcodes(Y->LinkEdit.BindOpcodes, Obj.getDyldInfoBindOpcodes());
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dumpBindOpcodes(Y->LinkEdit.WeakBindOpcodes,
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Obj.getDyldInfoWeakBindOpcodes());
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dumpBindOpcodes(Y->LinkEdit.LazyBindOpcodes, Obj.getDyldInfoLazyBindOpcodes(),
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true);
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dumpExportTrie(Y);
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dumpSymbols(Y);
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}
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void MachODumper::dumpRebaseOpcodes(std::unique_ptr<MachOYAML::Object> &Y) {
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MachOYAML::LinkEditData &LEData = Y->LinkEdit;
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auto RebaseOpcodes = Obj.getDyldInfoRebaseOpcodes();
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for (auto OpCode = RebaseOpcodes.begin(); OpCode != RebaseOpcodes.end();
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++OpCode) {
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MachOYAML::RebaseOpcode RebaseOp;
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RebaseOp.Opcode =
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static_cast<MachO::RebaseOpcode>(*OpCode & MachO::REBASE_OPCODE_MASK);
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RebaseOp.Imm = *OpCode & MachO::REBASE_IMMEDIATE_MASK;
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unsigned Count;
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uint64_t ULEB = 0;
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switch (RebaseOp.Opcode) {
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case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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RebaseOp.ExtraData.push_back(ULEB);
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OpCode += Count;
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// Intentionally no break here -- This opcode has two ULEB values
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case MachO::REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
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case MachO::REBASE_OPCODE_ADD_ADDR_ULEB:
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case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
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case MachO::REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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RebaseOp.ExtraData.push_back(ULEB);
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OpCode += Count;
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break;
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default:
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break;
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}
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LEData.RebaseOpcodes.push_back(RebaseOp);
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if (RebaseOp.Opcode == MachO::REBASE_OPCODE_DONE)
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break;
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}
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}
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StringRef ReadStringRef(const uint8_t *Start) {
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const uint8_t *Itr = Start;
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for (; *Itr; ++Itr)
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;
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return StringRef(reinterpret_cast<const char *>(Start), Itr - Start);
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}
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void MachODumper::dumpBindOpcodes(
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std::vector<MachOYAML::BindOpcode> &BindOpcodes,
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ArrayRef<uint8_t> OpcodeBuffer, bool Lazy) {
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for (auto OpCode = OpcodeBuffer.begin(); OpCode != OpcodeBuffer.end();
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++OpCode) {
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MachOYAML::BindOpcode BindOp;
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BindOp.Opcode =
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static_cast<MachO::BindOpcode>(*OpCode & MachO::BIND_OPCODE_MASK);
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BindOp.Imm = *OpCode & MachO::BIND_IMMEDIATE_MASK;
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unsigned Count;
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uint64_t ULEB = 0;
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int64_t SLEB = 0;
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switch (BindOp.Opcode) {
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case MachO::BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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BindOp.ULEBExtraData.push_back(ULEB);
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OpCode += Count;
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// Intentionally no break here -- this opcode has two ULEB values
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case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
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case MachO::BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
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case MachO::BIND_OPCODE_ADD_ADDR_ULEB:
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case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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BindOp.ULEBExtraData.push_back(ULEB);
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OpCode += Count;
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break;
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case MachO::BIND_OPCODE_SET_ADDEND_SLEB:
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SLEB = decodeSLEB128(OpCode + 1, &Count);
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BindOp.SLEBExtraData.push_back(SLEB);
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OpCode += Count;
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break;
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case MachO::BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
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BindOp.Symbol = ReadStringRef(OpCode + 1);
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OpCode += BindOp.Symbol.size() + 1;
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break;
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default:
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break;
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}
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BindOpcodes.push_back(BindOp);
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// Lazy bindings have DONE opcodes between operations, so we need to keep
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// processing after a DONE.
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if (!Lazy && BindOp.Opcode == MachO::BIND_OPCODE_DONE)
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break;
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}
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}
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/*!
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* /brief processes a node from the export trie, and its children.
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*
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* To my knowledge there is no documentation of the encoded format of this data
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* other than in the heads of the Apple linker engineers. To that end hopefully
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* this comment and the implementation below can serve to light the way for
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* anyone crazy enough to come down this path in the future.
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*
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* This function reads and preserves the trie structure of the export trie. To
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* my knowledge there is no code anywhere else that reads the data and preserves
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* the Trie. LD64 (sources available at opensource.apple.com) has a similar
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* implementation that parses the export trie into a vector. That code as well
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* as LLVM's libObject MachO implementation were the basis for this.
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*
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* The export trie is an encoded trie. The node serialization is a bit awkward.
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* The below pseudo-code is the best description I've come up with for it.
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*
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* struct SerializedNode {
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* ULEB128 TerminalSize;
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* struct TerminalData { <-- This is only present if TerminalSize > 0
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* ULEB128 Flags;
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* ULEB128 Address; <-- Present if (! Flags & REEXPORT )
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* ULEB128 Other; <-- Present if ( Flags & REEXPORT ||
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* Flags & STUB_AND_RESOLVER )
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* char[] ImportName; <-- Present if ( Flags & REEXPORT )
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* }
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* uint8_t ChildrenCount;
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* Pair<char[], ULEB128> ChildNameOffsetPair[ChildrenCount];
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* SerializedNode Children[ChildrenCount]
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* }
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*
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* Terminal nodes are nodes that represent actual exports. They can appear
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* anywhere in the tree other than at the root; they do not need to be leaf
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* nodes. When reading the data out of the trie this routine reads it in-order,
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* but it puts the child names and offsets directly into the child nodes. This
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* results in looping over the children twice during serialization and
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* de-serialization, but it makes the YAML representation more human readable.
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*
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* Below is an example of the graph from a "Hello World" executable:
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*
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* -------
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* | '' |
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* -------
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* |
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* -------
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* | '_' |
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* -------
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* |
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* |----------------------------------------|
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* | |
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* ------------------------ ---------------------
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* | '_mh_execute_header' | | 'main' |
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* | Flags: 0x00000000 | | Flags: 0x00000000 |
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* | Addr: 0x00000000 | | Addr: 0x00001160 |
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* ------------------------ ---------------------
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*
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* This graph represents the trie for the exports "__mh_execute_header" and
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* "_main". In the graph only the "_main" and "__mh_execute_header" nodes are
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* terminal.
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*/
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const uint8_t *processExportNode(const uint8_t *CurrPtr,
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const uint8_t *const End,
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MachOYAML::ExportEntry &Entry) {
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if (CurrPtr >= End)
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return CurrPtr;
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unsigned Count = 0;
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Entry.TerminalSize = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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if (Entry.TerminalSize != 0) {
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Entry.Flags = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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if (Entry.Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT) {
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Entry.Address = 0;
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Entry.Other = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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Entry.ImportName = std::string(reinterpret_cast<const char *>(CurrPtr));
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} else {
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Entry.Address = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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if (Entry.Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER) {
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Entry.Other = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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} else
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Entry.Other = 0;
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}
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}
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uint8_t childrenCount = *CurrPtr++;
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if (childrenCount == 0)
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return CurrPtr;
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Entry.Children.insert(Entry.Children.begin(), (size_t)childrenCount,
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MachOYAML::ExportEntry());
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for (auto &Child : Entry.Children) {
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Child.Name = std::string(reinterpret_cast<const char *>(CurrPtr));
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CurrPtr += Child.Name.length() + 1;
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Child.NodeOffset = decodeULEB128(CurrPtr, &Count);
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CurrPtr += Count;
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}
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for (auto &Child : Entry.Children) {
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CurrPtr = processExportNode(CurrPtr, End, Child);
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}
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return CurrPtr;
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}
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void MachODumper::dumpExportTrie(std::unique_ptr<MachOYAML::Object> &Y) {
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MachOYAML::LinkEditData &LEData = Y->LinkEdit;
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auto ExportsTrie = Obj.getDyldInfoExportsTrie();
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processExportNode(ExportsTrie.begin(), ExportsTrie.end(), LEData.ExportTrie);
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}
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template <typename nlist_t>
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MachOYAML::NListEntry constructNameList(const nlist_t &nlist) {
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MachOYAML::NListEntry NL;
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NL.n_strx = nlist.n_strx;
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NL.n_type = nlist.n_type;
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NL.n_sect = nlist.n_sect;
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NL.n_desc = nlist.n_desc;
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NL.n_value = nlist.n_value;
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return NL;
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}
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void MachODumper::dumpSymbols(std::unique_ptr<MachOYAML::Object> &Y) {
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MachOYAML::LinkEditData &LEData = Y->LinkEdit;
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|
|
|
for (auto Symbol : Obj.symbols()) {
|
|
MachOYAML::NListEntry NLE =
|
|
Obj.is64Bit() ? constructNameList<MachO::nlist_64>(
|
|
*reinterpret_cast<const MachO::nlist_64 *>(
|
|
Symbol.getRawDataRefImpl().p))
|
|
: constructNameList<MachO::nlist>(
|
|
*reinterpret_cast<const MachO::nlist *>(
|
|
Symbol.getRawDataRefImpl().p));
|
|
LEData.NameList.push_back(NLE);
|
|
}
|
|
|
|
StringRef RemainingTable = Obj.getStringTableData();
|
|
while (RemainingTable.size() > 0) {
|
|
auto SymbolPair = RemainingTable.split('\0');
|
|
RemainingTable = SymbolPair.second;
|
|
if (SymbolPair.first.empty())
|
|
break;
|
|
LEData.StringTable.push_back(SymbolPair.first);
|
|
}
|
|
}
|
|
|
|
Error macho2yaml(raw_ostream &Out, const object::MachOObjectFile &Obj) {
|
|
MachODumper Dumper(Obj);
|
|
Expected<std::unique_ptr<MachOYAML::Object>> YAML = Dumper.dump();
|
|
if (!YAML)
|
|
return YAML.takeError();
|
|
|
|
yaml::Output Yout(Out);
|
|
Yout << *(YAML.get());
|
|
return Error::success();
|
|
}
|
|
|
|
Error macho2yaml(raw_ostream &Out, const object::MachOUniversalBinary &Obj) {
|
|
return make_error<Obj2YamlError>(obj2yaml_error::not_implemented);
|
|
}
|
|
|
|
std::error_code macho2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
|
|
if (const auto *MachOObj = dyn_cast<object::MachOUniversalBinary>(&Obj)) {
|
|
if (auto Err = macho2yaml(Out, *MachOObj)) {
|
|
return errorToErrorCode(std::move(Err));
|
|
}
|
|
return obj2yaml_error::success;
|
|
}
|
|
|
|
if (const auto *MachOObj = dyn_cast<object::MachOObjectFile>(&Obj)) {
|
|
if (auto Err = macho2yaml(Out, *MachOObj)) {
|
|
return errorToErrorCode(std::move(Err));
|
|
}
|
|
return obj2yaml_error::success;
|
|
}
|
|
|
|
return obj2yaml_error::unsupported_obj_file_format;
|
|
}
|