CbC/CbC_llvm: lib/Object/COFFObjectFile.cpp comparison

comparison lib/Object/COFFObjectFile.cpp @ 0:95c75e76d11b LLVM3.4

LLVM 3.4

author	Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date	Thu, 12 Dec 2013 13:56:28 +0900
parents
children	54457678186b

comparison

equal deleted inserted replaced

--1:000000000000
+:95c75e76d11b
+//===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the COFFObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/Object/COFF.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cctype>
+using namespace llvm;
+using namespace object;
+namespace {
+using support::ulittle8_t;
+using support::ulittle16_t;
+using support::ulittle32_t;
+using support::little16_t;
+}
+namespace {
+// Returns false if size is greater than the buffer size. And sets ec.
+bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) {
+if (m->getBufferSize() < size) {
+ec = object_error::unexpected_eof;
+return false;
+}
+return true;
+}
+// Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
+// Returns unexpected_eof if error.
+template<typename T>
+error_code getObject(const T *&Obj, const MemoryBuffer *M, const uint8_t *Ptr,
+const size_t Size = sizeof(T)) {
+uintptr_t Addr = uintptr_t(Ptr);
+if (Addr + Size < Addr ||
+Addr + Size < Size ||
+Addr + Size > uintptr_t(M->getBufferEnd())) {
+return object_error::unexpected_eof;
+}
+Obj = reinterpret_cast<const T *>(Addr);
+return object_error::success;
+}
+}
+const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const {
+const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p);
+# ifndef NDEBUG
+// Verify that the symbol points to a valid entry in the symbol table.
+uintptr_t offset = uintptr_t(addr) - uintptr_t(base());
+if (offset < COFFHeader->PointerToSymbolTable
+|| offset >= COFFHeader->PointerToSymbolTable
++ (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+report_fatal_error("Symbol was outside of symbol table.");
+assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
+== 0 && "Symbol did not point to the beginning of a symbol");
+# endif
+return addr;
+}
+const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const {
+const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p);
+# ifndef NDEBUG
+// Verify that the section points to a valid entry in the section table.
+if (addr < SectionTable
+|| addr >= (SectionTable + COFFHeader->NumberOfSections))
+report_fatal_error("Section was outside of section table.");
+uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable);
+assert(offset % sizeof(coff_section) == 0 &&
+"Section did not point to the beginning of a section");
+# endif
+return addr;
+}
+error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb,
+SymbolRef &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+symb += 1 + symb->NumberOfAuxSymbols;
+Symb.p = reinterpret_cast<uintptr_t>(symb);
+Result = SymbolRef(Symb, this);
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolName(DataRefImpl Symb,
+StringRef &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+return getSymbolName(symb, Result);
+}
+error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Symb,
+uint64_t &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+const coff_section *Section = NULL;
+if (error_code ec = getSection(symb->SectionNumber, Section))
+return ec;
+if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+Result = UnknownAddressOrSize;
+else if (Section)
+Result = Section->PointerToRawData + symb->Value;
+else
+Result = symb->Value;
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
+uint64_t &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+const coff_section *Section = NULL;
+if (error_code ec = getSection(symb->SectionNumber, Section))
+return ec;
+if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+Result = UnknownAddressOrSize;
+else if (Section)
+Result = Section->VirtualAddress + symb->Value;
+else
+Result = symb->Value;
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
+SymbolRef::Type &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+Result = SymbolRef::ST_Other;
+if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
+symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
+Result = SymbolRef::ST_Unknown;
+} else {
+if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
+Result = SymbolRef::ST_Function;
+} else {
+uint32_t Characteristics = 0;
+if (symb->SectionNumber > 0) {
+const coff_section *Section = NULL;
+if (error_code ec = getSection(symb->SectionNumber, Section))
+return ec;
+Characteristics = Section->Characteristics;
+}
+if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
+~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
+Result = SymbolRef::ST_Data;
+}
+}
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb,
+uint32_t &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+Result = SymbolRef::SF_None;
+// TODO: Correctly set SF_FormatSpecific, SF_ThreadLocal, SF_Common
+if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
+symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+Result |= SymbolRef::SF_Undefined;
+// TODO: This are certainly too restrictive.
+if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
+Result |= SymbolRef::SF_Global;
+if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
+Result |= SymbolRef::SF_Weak;
+if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
+Result |= SymbolRef::SF_Absolute;
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
+uint64_t &Result) const {
+// FIXME: Return the correct size. This requires looking at all the symbols
+//        in the same section as this symbol, and looking for either the next
+//        symbol, or the end of the section.
+const coff_symbol *symb = toSymb(Symb);
+const coff_section *Section = NULL;
+if (error_code ec = getSection(symb->SectionNumber, Section))
+return ec;
+if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+Result = UnknownAddressOrSize;
+else if (Section)
+Result = Section->SizeOfRawData - symb->Value;
+else
+Result = 0;
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
+section_iterator &Result) const {
+const coff_symbol *symb = toSymb(Symb);
+if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
+Result = end_sections();
+else {
+const coff_section *sec = 0;
+if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
+DataRefImpl Sec;
+Sec.p = reinterpret_cast<uintptr_t>(sec);
+Result = section_iterator(SectionRef(Sec, this));
+}
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolValue(DataRefImpl Symb,
+uint64_t &Val) const {
+report_fatal_error("getSymbolValue unimplemented in COFFObjectFile");
+}
+error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
+SectionRef &Result) const {
+const coff_section *sec = toSec(Sec);
+sec += 1;
+Sec.p = reinterpret_cast<uintptr_t>(sec);
+Result = SectionRef(Sec, this);
+return object_error::success;
+}
+error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
+StringRef &Result) const {
+const coff_section *sec = toSec(Sec);
+return getSectionName(sec, Result);
+}
+error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
+uint64_t &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->VirtualAddress;
+return object_error::success;
+}
+error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
+uint64_t &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->SizeOfRawData;
+return object_error::success;
+}
+error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
+StringRef &Result) const {
+const coff_section *sec = toSec(Sec);
+ArrayRef<uint8_t> Res;
+error_code EC = getSectionContents(sec, Res);
+Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
+return EC;
+}
+error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
+uint64_t &Res) const {
+const coff_section *sec = toSec(Sec);
+if (!sec)
+return object_error::parse_failed;
+Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
+bool &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
+bool &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
+bool &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
+bool &Result) const {
+// FIXME: Unimplemented
+Result = true;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec,
+bool &Result) const {
+const coff_section *sec = toSec(Sec);
+Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
+bool &Result) const {
+// FIXME: Unimplemented.
+Result = false;
+return object_error::success;
+}
+error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
+bool &Result) const {
+// FIXME: Unimplemented.
+Result = false;
+return object_error::success;
+}
+error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
+DataRefImpl Symb,
+bool &Result) const {
+const coff_section *sec = toSec(Sec);
+const coff_symbol *symb = toSymb(Symb);
+const coff_section *symb_sec = 0;
+if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
+if (symb_sec == sec)
+Result = true;
+else
+Result = false;
+return object_error::success;
+}
+relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Sec) const {
+const coff_section *sec = toSec(Sec);
+DataRefImpl ret;
+if (sec->NumberOfRelocations == 0)
+ret.p = 0;
+else
+ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
+return relocation_iterator(RelocationRef(ret, this));
+}
+relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Sec) const {
+const coff_section *sec = toSec(Sec);
+DataRefImpl ret;
+if (sec->NumberOfRelocations == 0)
+ret.p = 0;
+else
+ret.p = reinterpret_cast<uintptr_t>(
+reinterpret_cast<const coff_relocation*>(
+base() + sec->PointerToRelocations)
++ sec->NumberOfRelocations);
+return relocation_iterator(RelocationRef(ret, this));
+}
+// Initialize the pointer to the symbol table.
+error_code COFFObjectFile::initSymbolTablePtr() {
+if (error_code ec = getObject(
+SymbolTable, Data, base() + COFFHeader->PointerToSymbolTable,
+COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+return ec;
+// Find string table. The first four byte of the string table contains the
+// total size of the string table, including the size field itself. If the
+// string table is empty, the value of the first four byte would be 4.
+const uint8_t *StringTableAddr =
+base() + COFFHeader->PointerToSymbolTable +
+COFFHeader->NumberOfSymbols * sizeof(coff_symbol);
+const ulittle32_t *StringTableSizePtr;
+if (error_code ec = getObject(StringTableSizePtr, Data, StringTableAddr))
+return ec;
+StringTableSize = *StringTableSizePtr;
+if (error_code ec =
+getObject(StringTable, Data, StringTableAddr, StringTableSize))
+return ec;
+// Check that the string table is null terminated if has any in it.
+if (StringTableSize < 4 ||
+(StringTableSize > 4 && StringTable[StringTableSize - 1] != 0))
+return  object_error::parse_failed;
+return object_error::success;
+}
+// Returns the file offset for the given RVA.
+error_code COFFObjectFile::getRvaPtr(uint32_t Rva, uintptr_t &Res) const {
+error_code ec;
+for (section_iterator i = begin_sections(), e = end_sections(); i != e;
+i.increment(ec)) {
+if (ec)
+return ec;
+const coff_section *Section = getCOFFSection(i);
+uint32_t SectionStart = Section->VirtualAddress;
+uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize;
+if (SectionStart <= Rva && Rva < SectionEnd) {
+uint32_t Offset = Rva - SectionStart;
+Res = uintptr_t(base()) + Section->PointerToRawData + Offset;
+return object_error::success;
+}
+}
+return object_error::parse_failed;
+}
+// Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
+// table entry.
+error_code COFFObjectFile::
+getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const {
+uintptr_t IntPtr = 0;
+if (error_code ec = getRvaPtr(Rva, IntPtr))
+return ec;
+const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr);
+Hint = *reinterpret_cast<const ulittle16_t *>(Ptr);
+Name = StringRef(reinterpret_cast<const char *>(Ptr + 2));
+return object_error::success;
+}
+// Find the import table.
+error_code COFFObjectFile::initImportTablePtr() {
+// First, we get the RVA of the import table. If the file lacks a pointer to
+// the import table, do nothing.
+const data_directory *DataEntry;
+if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry))
+return object_error::success;
+// Do nothing if the pointer to import table is NULL.
+if (DataEntry->RelativeVirtualAddress == 0)
+return object_error::success;
+uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;
+NumberOfImportDirectory = DataEntry->Size /
+sizeof(import_directory_table_entry);
+// Find the section that contains the RVA. This is needed because the RVA is
+// the import table's memory address which is different from its file offset.
+uintptr_t IntPtr = 0;
+if (error_code ec = getRvaPtr(ImportTableRva, IntPtr))
+return ec;
+ImportDirectory = reinterpret_cast<
+const import_directory_table_entry *>(IntPtr);
+// It's an error if there's no section containing the Import Table RVA.
+return object_error::parse_failed;
+}
+COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
+: ObjectFile(Binary::ID_COFF, Object)
+, COFFHeader(0)
+, PE32Header(0)
+, DataDirectory(0)
+, SectionTable(0)
+, SymbolTable(0)
+, StringTable(0)
+, StringTableSize(0)
+, ImportDirectory(0)
+, NumberOfImportDirectory(0) {
+// Check that we at least have enough room for a header.
+if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
+// The current location in the file where we are looking at.
+uint64_t CurPtr = 0;
+// PE header is optional and is present only in executables. If it exists,
+// it is placed right after COFF header.
+bool hasPEHeader = false;
+// Check if this is a PE/COFF file.
+if (base()[0] == 0x4d && base()[1] == 0x5a) {
+// PE/COFF, seek through MS-DOS compatibility stub and 4-byte
+// PE signature to find 'normal' COFF header.
+if (!checkSize(Data, ec, 0x3c + 8)) return;
+CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
+// Check the PE magic bytes. ("PE\0\0")
+if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) {
+ec = object_error::parse_failed;
+return;
+}
+CurPtr += 4; // Skip the PE magic bytes.
+hasPEHeader = true;
+}
+if ((ec = getObject(COFFHeader, Data, base() + CurPtr)))
+return;
+CurPtr += sizeof(coff_file_header);
+if (hasPEHeader) {
+if ((ec = getObject(PE32Header, Data, base() + CurPtr)))
+return;
+if (PE32Header->Magic != 0x10b) {
+// We only support PE32. If this is PE32 (not PE32+), the magic byte
+// should be 0x10b. If this is not PE32, continue as if there's no PE
+// header in this file.
+PE32Header = 0;
+} else if (PE32Header->NumberOfRvaAndSize > 0) {
+const uint8_t *addr = base() + CurPtr + sizeof(pe32_header);
+uint64_t size = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
+if ((ec = getObject(DataDirectory, Data, addr, size)))
+return;
+}
+CurPtr += COFFHeader->SizeOfOptionalHeader;
+}
+if (!COFFHeader->isImportLibrary())
+if ((ec = getObject(SectionTable, Data, base() + CurPtr,
+COFFHeader->NumberOfSections * sizeof(coff_section))))
+return;
+// Initialize the pointer to the symbol table.
+if (COFFHeader->PointerToSymbolTable != 0)
+if ((ec = initSymbolTablePtr()))
+return;
+// Initialize the pointer to the beginning of the import table.
+if ((ec = initImportTablePtr()))
+return;
+ec = object_error::success;
+}
+symbol_iterator COFFObjectFile::begin_symbols() const {
+DataRefImpl ret;
+ret.p = reinterpret_cast<uintptr_t>(SymbolTable);
+return symbol_iterator(SymbolRef(ret, this));
+}
+symbol_iterator COFFObjectFile::end_symbols() const {
+// The symbol table ends where the string table begins.
+DataRefImpl ret;
+ret.p = reinterpret_cast<uintptr_t>(StringTable);
+return symbol_iterator(SymbolRef(ret, this));
+}
+symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
+// TODO: implement
+report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
+}
+symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
+// TODO: implement
+report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
+}
+library_iterator COFFObjectFile::begin_libraries_needed() const {
+// TODO: implement
+report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
+}
+library_iterator COFFObjectFile::end_libraries_needed() const {
+// TODO: implement
+report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
+}
+StringRef COFFObjectFile::getLoadName() const {
+// COFF does not have this field.
+return "";
+}
+import_directory_iterator COFFObjectFile::import_directory_begin() const {
+DataRefImpl Imp;
+Imp.p = reinterpret_cast<uintptr_t>(ImportDirectory);
+return import_directory_iterator(ImportDirectoryEntryRef(Imp, this));
+}
+import_directory_iterator COFFObjectFile::import_directory_end() const {
+DataRefImpl Imp;
+if (ImportDirectory) {
+Imp.p = reinterpret_cast<uintptr_t>(
+ImportDirectory + (NumberOfImportDirectory - 1));
+} else {
+Imp.p = 0;
+}
+return import_directory_iterator(ImportDirectoryEntryRef(Imp, this));
+}
+section_iterator COFFObjectFile::begin_sections() const {
+DataRefImpl ret;
+ret.p = reinterpret_cast<uintptr_t>(SectionTable);
+return section_iterator(SectionRef(ret, this));
+}
+section_iterator COFFObjectFile::end_sections() const {
+DataRefImpl ret;
+int numSections = COFFHeader->isImportLibrary()
+? 0 : COFFHeader->NumberOfSections;
+ret.p = reinterpret_cast<uintptr_t>(SectionTable + numSections);
+return section_iterator(SectionRef(ret, this));
+}
+uint8_t COFFObjectFile::getBytesInAddress() const {
+return getArch() == Triple::x86_64 ? 8 : 4;
+}
+StringRef COFFObjectFile::getFileFormatName() const {
+switch(COFFHeader->Machine) {
+case COFF::IMAGE_FILE_MACHINE_I386:
+return "COFF-i386";
+case COFF::IMAGE_FILE_MACHINE_AMD64:
+return "COFF-x86-64";
+default:
+return "COFF-<unknown arch>";
+}
+}
+unsigned COFFObjectFile::getArch() const {
+switch(COFFHeader->Machine) {
+case COFF::IMAGE_FILE_MACHINE_I386:
+return Triple::x86;
+case COFF::IMAGE_FILE_MACHINE_AMD64:
+return Triple::x86_64;
+default:
+return Triple::UnknownArch;
+}
+}
+// This method is kept here because lld uses this. As soon as we make
+// lld to use getCOFFHeader, this method will be removed.
+error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
+return getCOFFHeader(Res);
+}
+error_code COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const {
+Res = COFFHeader;
+return object_error::success;
+}
+error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
+Res = PE32Header;
+return object_error::success;
+}
+error_code COFFObjectFile::getDataDirectory(uint32_t index,
+const data_directory *&Res) const {
+// Error if if there's no data directory or the index is out of range.
+if (!DataDirectory || index > PE32Header->NumberOfRvaAndSize)
+return object_error::parse_failed;
+Res = &DataDirectory[index];
+return object_error::success;
+}
+error_code COFFObjectFile::getSection(int32_t index,
+const coff_section *&Result) const {
+// Check for special index values.
+if (index == COFF::IMAGE_SYM_UNDEFINED ||
+index == COFF::IMAGE_SYM_ABSOLUTE ||
+index == COFF::IMAGE_SYM_DEBUG)
+Result = NULL;
+else if (index > 0 && index <= COFFHeader->NumberOfSections)
+// We already verified the section table data, so no need to check again.
+Result = SectionTable + (index - 1);
+else
+return object_error::parse_failed;
+return object_error::success;
+}
+error_code COFFObjectFile::getString(uint32_t offset,
+StringRef &Result) const {
+if (StringTableSize <= 4)
+// Tried to get a string from an empty string table.
+return object_error::parse_failed;
+if (offset >= StringTableSize)
+return object_error::unexpected_eof;
+Result = StringRef(StringTable + offset);
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbol(uint32_t index,
+const coff_symbol *&Result) const {
+if (index < COFFHeader->NumberOfSymbols)
+Result = SymbolTable + index;
+else
+return object_error::parse_failed;
+return object_error::success;
+}
+error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
+StringRef &Res) const {
+// Check for string table entry. First 4 bytes are 0.
+if (symbol->Name.Offset.Zeroes == 0) {
+uint32_t Offset = symbol->Name.Offset.Offset;
+if (error_code ec = getString(Offset, Res))
+return ec;
+return object_error::success;
+}
+if (symbol->Name.ShortName[7] == 0)
+// Null terminated, let ::strlen figure out the length.
+Res = StringRef(symbol->Name.ShortName);
+else
+// Not null terminated, use all 8 bytes.
+Res = StringRef(symbol->Name.ShortName, 8);
+return object_error::success;
+}
+ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData(
+const coff_symbol *symbol) const {
+const uint8_t *aux = NULL;
+if ( symbol->NumberOfAuxSymbols > 0 ) {
+// AUX data comes immediately after the symbol in COFF
+aux = reinterpret_cast<const uint8_t *>(symbol + 1);
+# ifndef NDEBUG
+// Verify that the aux symbol points to a valid entry in the symbol table.
+uintptr_t offset = uintptr_t(aux) - uintptr_t(base());
+if (offset < COFFHeader->PointerToSymbolTable
+|| offset >= COFFHeader->PointerToSymbolTable
++ (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+report_fatal_error("Aux Symbol data was outside of symbol table.");
+assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
+== 0 && "Aux Symbol data did not point to the beginning of a symbol");
+# endif
+}
+return ArrayRef<uint8_t>(aux, symbol->NumberOfAuxSymbols * sizeof(coff_symbol));
+}
+error_code COFFObjectFile::getSectionName(const coff_section *Sec,
+StringRef &Res) const {
+StringRef Name;
+if (Sec->Name[7] == 0)
+// Null terminated, let ::strlen figure out the length.
+Name = Sec->Name;
+else
+// Not null terminated, use all 8 bytes.
+Name = StringRef(Sec->Name, 8);
+// Check for string table entry. First byte is '/'.
+if (Name[0] == '/') {
+uint32_t Offset;
+if (Name.substr(1).getAsInteger(10, Offset))
+return object_error::parse_failed;
+if (error_code ec = getString(Offset, Name))
+return ec;
+}
+Res = Name;
+return object_error::success;
+}
+error_code COFFObjectFile::getSectionContents(const coff_section *Sec,
+ArrayRef<uint8_t> &Res) const {
+// The only thing that we need to verify is that the contents is contained
+// within the file bounds. We don't need to make sure it doesn't cover other
+// data, as there's nothing that says that is not allowed.
+uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
+uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
+if (ConEnd > uintptr_t(Data->getBufferEnd()))
+return object_error::parse_failed;
+Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
+Sec->SizeOfRawData);
+return object_error::success;
+}
+const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
+return reinterpret_cast<const coff_relocation*>(Rel.p);
+}
+error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
+RelocationRef &Res) const {
+Rel.p = reinterpret_cast<uintptr_t>(
+reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
+Res = RelocationRef(Rel, this);
+return object_error::success;
+}
+error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
+uint64_t &Res) const {
+report_fatal_error("getRelocationAddress not implemented in COFFObjectFile");
+}
+error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
+uint64_t &Res) const {
+Res = toRel(Rel)->VirtualAddress;
+return object_error::success;
+}
+symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
+const coff_relocation* R = toRel(Rel);
+DataRefImpl Symb;
+Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
+return symbol_iterator(SymbolRef(Symb, this));
+}
+error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
+uint64_t &Res) const {
+const coff_relocation* R = toRel(Rel);
+Res = R->Type;
+return object_error::success;
+}
+const coff_section *COFFObjectFile::getCOFFSection(section_iterator &It) const {
+return toSec(It->getRawDataRefImpl());
+}
+const coff_symbol *COFFObjectFile::getCOFFSymbol(symbol_iterator &It) const {
+return toSymb(It->getRawDataRefImpl());
+}
+const coff_relocation *COFFObjectFile::getCOFFRelocation(
+relocation_iterator &It) const {
+return toRel(It->getRawDataRefImpl());
+}
+#define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
+case COFF::enum: res = #enum; break;
+error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
+SmallVectorImpl<char> &Result) const {
+const coff_relocation *reloc = toRel(Rel);
+StringRef res;
+switch (COFFHeader->Machine) {
+case COFF::IMAGE_FILE_MACHINE_AMD64:
+switch (reloc->Type) {
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
+default:
+res = "Unknown";
+}
+break;
+case COFF::IMAGE_FILE_MACHINE_I386:
+switch (reloc->Type) {
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
+LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
+default:
+res = "Unknown";
+}
+break;
+default:
+res = "Unknown";
+}
+Result.append(res.begin(), res.end());
+return object_error::success;
+}
+#undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
+error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
+SmallVectorImpl<char> &Result) const {
+const coff_relocation *reloc = toRel(Rel);
+const coff_symbol *symb = 0;
+if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
+DataRefImpl sym;
+sym.p = reinterpret_cast<uintptr_t>(symb);
+StringRef symname;
+if (error_code ec = getSymbolName(sym, symname)) return ec;
+Result.append(symname.begin(), symname.end());
+return object_error::success;
+}
+error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
+LibraryRef &Result) const {
+report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
+}
+error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
+StringRef &Result) const {
+report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
+}
+bool ImportDirectoryEntryRef::
+operator==(const ImportDirectoryEntryRef &Other) const {
+return ImportDirectoryPimpl == Other.ImportDirectoryPimpl;
+}
+static const import_directory_table_entry *toImportEntry(DataRefImpl Imp) {
+return reinterpret_cast<const import_directory_table_entry *>(Imp.p);
+}
+error_code
+ImportDirectoryEntryRef::getNext(ImportDirectoryEntryRef &Result) const {
+const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+Dir += 1;
+DataRefImpl Next;
+Next.p = reinterpret_cast<uintptr_t>(Dir);
+Result = ImportDirectoryEntryRef(Next, OwningObject);
+return object_error::success;
+}
+error_code ImportDirectoryEntryRef::
+getImportTableEntry(const import_directory_table_entry *&Result) const {
+Result = toImportEntry(ImportDirectoryPimpl);
+return object_error::success;
+}
+error_code ImportDirectoryEntryRef::getName(StringRef &Result) const {
+const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+uintptr_t IntPtr = 0;
+if (error_code ec = OwningObject->getRvaPtr(Dir->NameRVA, IntPtr))
+return ec;
+const char *Ptr = reinterpret_cast<const char *>(IntPtr);
+Result = StringRef(Ptr);
+return object_error::success;
+}
+error_code ImportDirectoryEntryRef::getImportLookupEntry(
+const import_lookup_table_entry32 *&Result) const {
+const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+uintptr_t IntPtr = 0;
+if (error_code ec = OwningObject->getRvaPtr(
+Dir->ImportLookupTableRVA, IntPtr))
+return ec;
+Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr);
+return object_error::success;
+}
+namespace llvm {
+ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
+error_code ec;
+return new COFFObjectFile(Object, ec);
+}
+} // end namespace llvm

Mercurial > hg > CbC > CbC_llvm

comparison lib/Object/COFFObjectFile.cpp @ 0:95c75e76d11b LLVM3.4