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

comparison lib/Object/XCOFFObjectFile.cpp @ 148:63bd29f05246

merged

author	Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date	Wed, 14 Aug 2019 19:46:37 +0900
parents	c2174574ed3a
children

comparison

equal deleted inserted replaced

-:3fc4d5c3e21e
+:63bd29f05246
+//===--- XCOFFObjectFile.cpp - XCOFF object file implementation -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the XCOFFObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/Object/XCOFFObjectFile.h"
+#include <cstddef>
+#include <cstring>
+namespace llvm {
+namespace object {
+// Checks that [Ptr, Ptr + Size) bytes fall inside the memory buffer
+// 'M'. Returns a pointer to the underlying object on success.
+template <typename T>
+static Expected<const T *> getObject(MemoryBufferRef M, const void *Ptr,
+const uint64_t Size = sizeof(T)) {
+uintptr_t Addr = uintptr_t(Ptr);
+if (std::error_code EC = Binary::checkOffset(M, Addr, Size))
+return errorCodeToError(EC);
+return reinterpret_cast<const T *>(Addr);
+}
+static uintptr_t getWithOffset(uintptr_t Base, ptrdiff_t Offset) {
+return reinterpret_cast<uintptr_t>(reinterpret_cast<const char *>(Base) +
+Offset);
+}
+template <typename T> static const T *viewAs(uintptr_t in) {
+return reinterpret_cast<const T *>(in);
+}
+static StringRef generateStringRef(const char *Name) {
+auto NulCharPtr =
+static_cast<const char *>(memchr(Name, '\0', XCOFF::NameSize));
+return NulCharPtr ? StringRef(Name, NulCharPtr - Name)
+: StringRef(Name, XCOFF::NameSize);
+}
+void XCOFFObjectFile::checkSectionAddress(uintptr_t Addr,
+uintptr_t TableAddress) const {
+if (Addr < TableAddress)
+report_fatal_error("Section header outside of section header table.");
+uintptr_t Offset = Addr - TableAddress;
+if (Offset >= getSectionHeaderSize() * getNumberOfSections())
+report_fatal_error("Section header outside of section header table.");
+if (Offset % getSectionHeaderSize() != 0)
+report_fatal_error(
+"Section header pointer does not point to a valid section header.");
+}
+const XCOFFSectionHeader32 *
+XCOFFObjectFile::toSection32(DataRefImpl Ref) const {
+assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
+#ifndef NDEBUG
+checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
+#endif
+return viewAs<XCOFFSectionHeader32>(Ref.p);
+}
+const XCOFFSectionHeader64 *
+XCOFFObjectFile::toSection64(DataRefImpl Ref) const {
+assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
+#ifndef NDEBUG
+checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
+#endif
+return viewAs<XCOFFSectionHeader64>(Ref.p);
+}
+const XCOFFSymbolEntry *XCOFFObjectFile::toSymbolEntry(DataRefImpl Ref) const {
+assert(!is64Bit() && "Symbol table support not implemented for 64-bit.");
+assert(Ref.p != 0 && "Symbol table pointer can not be nullptr!");
+auto SymEntPtr = viewAs<XCOFFSymbolEntry>(Ref.p);
+return SymEntPtr;
+}
+const XCOFFFileHeader32 *XCOFFObjectFile::fileHeader32() const {
+assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
+return static_cast<const XCOFFFileHeader32 *>(FileHeader);
+}
+const XCOFFFileHeader64 *XCOFFObjectFile::fileHeader64() const {
+assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
+return static_cast<const XCOFFFileHeader64 *>(FileHeader);
+}
+const XCOFFSectionHeader32 *
+XCOFFObjectFile::sectionHeaderTable32() const {
+assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
+return static_cast<const XCOFFSectionHeader32 *>(SectionHeaderTable);
+}
+const XCOFFSectionHeader64 *
+XCOFFObjectFile::sectionHeaderTable64() const {
+assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
+return static_cast<const XCOFFSectionHeader64 *>(SectionHeaderTable);
+}
+void XCOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
+const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
+SymEntPtr += SymEntPtr->NumberOfAuxEntries + 1;
+Symb.p = reinterpret_cast<uintptr_t>(SymEntPtr);
+}
+Expected<StringRef> XCOFFObjectFile::getSymbolName(DataRefImpl Symb) const {
+const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
+if (SymEntPtr->NameInStrTbl.Magic != XCOFFSymbolEntry::NAME_IN_STR_TBL_MAGIC)
+return generateStringRef(SymEntPtr->SymbolName);
+// A storage class value with the high-order bit on indicates that the name is
+// a symbolic debugger stabstring.
+if (SymEntPtr->StorageClass & 0x80)
+return StringRef("Unimplemented Debug Name");
+uint32_t Offset = SymEntPtr->NameInStrTbl.Offset;
+// The byte offset is relative to the start of the string table
+// or .debug section. A byte offset value of 0 is a null or zero-length symbol
+// name. A byte offset in the range 1 to 3 (inclusive) points into the length
+// field; as a soft-error recovery mechanism, we treat such cases as having an
+// offset of 0.
+if (Offset < 4)
+return StringRef(nullptr, 0);
+if (StringTable.Data != nullptr && StringTable.Size > Offset)
+return (StringTable.Data + Offset);
+return make_error<GenericBinaryError>("Symbol Name parse failed",
+object_error::parse_failed);
+}
+Expected<uint64_t> XCOFFObjectFile::getSymbolAddress(DataRefImpl Symb) const {
+uint64_t Result = 0;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+uint64_t XCOFFObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
+return toSymbolEntry(Symb)->Value;
+}
+uint64_t XCOFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
+uint64_t Result = 0;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+Expected<SymbolRef::Type>
+XCOFFObjectFile::getSymbolType(DataRefImpl Symb) const {
+llvm_unreachable("Not yet implemented!");
+return SymbolRef::ST_Other;
+}
+Expected<section_iterator>
+XCOFFObjectFile::getSymbolSection(DataRefImpl Symb) const {
+const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
+int16_t SectNum = SymEntPtr->SectionNumber;
+if (isReservedSectionNumber(SectNum))
+return section_end();
+Expected<DataRefImpl> ExpSec = getSectionByNum(SectNum);
+if (!ExpSec)
+return ExpSec.takeError();
+return section_iterator(SectionRef(ExpSec.get(), this));
+}
+void XCOFFObjectFile::moveSectionNext(DataRefImpl &Sec) const {
+const char *Ptr = reinterpret_cast<const char *>(Sec.p);
+Sec.p = reinterpret_cast<uintptr_t>(Ptr + getSectionHeaderSize());
+}
+Expected<StringRef> XCOFFObjectFile::getSectionName(DataRefImpl Sec) const {
+return generateStringRef(getSectionNameInternal(Sec));
+}
+uint64_t XCOFFObjectFile::getSectionAddress(DataRefImpl Sec) const {
+// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
+// with MSVC.
+if (is64Bit())
+return toSection64(Sec)->VirtualAddress;
+return toSection32(Sec)->VirtualAddress;
+}
+uint64_t XCOFFObjectFile::getSectionIndex(DataRefImpl Sec) const {
+// Section numbers in XCOFF are numbered beginning at 1. A section number of
+// zero is used to indicate that a symbol is being imported or is undefined.
+if (is64Bit())
+return toSection64(Sec) - sectionHeaderTable64() + 1;
+else
+return toSection32(Sec) - sectionHeaderTable32() + 1;
+}
+uint64_t XCOFFObjectFile::getSectionSize(DataRefImpl Sec) const {
+// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
+// with MSVC.
+if (is64Bit())
+return toSection64(Sec)->SectionSize;
+return toSection32(Sec)->SectionSize;
+}
+Expected<ArrayRef<uint8_t>>
+XCOFFObjectFile::getSectionContents(DataRefImpl Sec) const {
+llvm_unreachable("Not yet implemented!");
+}
+uint64_t XCOFFObjectFile::getSectionAlignment(DataRefImpl Sec) const {
+uint64_t Result = 0;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+bool XCOFFObjectFile::isSectionCompressed(DataRefImpl Sec) const {
+bool Result = false;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+bool XCOFFObjectFile::isSectionText(DataRefImpl Sec) const {
+return getSectionFlags(Sec) & XCOFF::STYP_TEXT;
+}
+bool XCOFFObjectFile::isSectionData(DataRefImpl Sec) const {
+uint32_t Flags = getSectionFlags(Sec);
+return Flags & (XCOFF::STYP_DATA | XCOFF::STYP_TDATA);
+}
+bool XCOFFObjectFile::isSectionBSS(DataRefImpl Sec) const {
+uint32_t Flags = getSectionFlags(Sec);
+return Flags & (XCOFF::STYP_BSS | XCOFF::STYP_TBSS);
+}
+bool XCOFFObjectFile::isSectionVirtual(DataRefImpl Sec) const {
+bool Result = false;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+relocation_iterator XCOFFObjectFile::section_rel_begin(DataRefImpl Sec) const {
+llvm_unreachable("Not yet implemented!");
+return relocation_iterator(RelocationRef());
+}
+relocation_iterator XCOFFObjectFile::section_rel_end(DataRefImpl Sec) const {
+llvm_unreachable("Not yet implemented!");
+return relocation_iterator(RelocationRef());
+}
+void XCOFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
+llvm_unreachable("Not yet implemented!");
+return;
+}
+uint64_t XCOFFObjectFile::getRelocationOffset(DataRefImpl Rel) const {
+llvm_unreachable("Not yet implemented!");
+uint64_t Result = 0;
+return Result;
+}
+symbol_iterator XCOFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
+llvm_unreachable("Not yet implemented!");
+return symbol_iterator(SymbolRef());
+}
+uint64_t XCOFFObjectFile::getRelocationType(DataRefImpl Rel) const {
+llvm_unreachable("Not yet implemented!");
+uint64_t Result = 0;
+return Result;
+}
+void XCOFFObjectFile::getRelocationTypeName(
+DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
+llvm_unreachable("Not yet implemented!");
+return;
+}
+uint32_t XCOFFObjectFile::getSymbolFlags(DataRefImpl Symb) const {
+uint32_t Result = 0;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+basic_symbol_iterator XCOFFObjectFile::symbol_begin() const {
+assert(!is64Bit() && "64-bit support not implemented yet.");
+DataRefImpl SymDRI;
+SymDRI.p = reinterpret_cast<uintptr_t>(SymbolTblPtr);
+return basic_symbol_iterator(SymbolRef(SymDRI, this));
+}
+basic_symbol_iterator XCOFFObjectFile::symbol_end() const {
+assert(!is64Bit() && "64-bit support not implemented yet.");
+DataRefImpl SymDRI;
+SymDRI.p = reinterpret_cast<uintptr_t>(
+SymbolTblPtr + getLogicalNumberOfSymbolTableEntries32());
+return basic_symbol_iterator(SymbolRef(SymDRI, this));
+}
+section_iterator XCOFFObjectFile::section_begin() const {
+DataRefImpl DRI;
+DRI.p = getSectionHeaderTableAddress();
+return section_iterator(SectionRef(DRI, this));
+}
+section_iterator XCOFFObjectFile::section_end() const {
+DataRefImpl DRI;
+DRI.p = getWithOffset(getSectionHeaderTableAddress(),
+getNumberOfSections() * getSectionHeaderSize());
+return section_iterator(SectionRef(DRI, this));
+}
+uint8_t XCOFFObjectFile::getBytesInAddress() const { return is64Bit() ? 8 : 4; }
+StringRef XCOFFObjectFile::getFileFormatName() const {
+return is64Bit() ? "aix5coff64-rs6000" : "aixcoff-rs6000";
+}
+Triple::ArchType XCOFFObjectFile::getArch() const {
+return is64Bit() ? Triple::ppc64 : Triple::ppc;
+}
+SubtargetFeatures XCOFFObjectFile::getFeatures() const {
+llvm_unreachable("Not yet implemented!");
+return SubtargetFeatures();
+}
+bool XCOFFObjectFile::isRelocatableObject() const {
+bool Result = false;
+llvm_unreachable("Not yet implemented!");
+return Result;
+}
+Expected<uint64_t> XCOFFObjectFile::getStartAddress() const {
+// TODO FIXME Should get from auxiliary_header->o_entry when support for the
+// auxiliary_header is added.
+return 0;
+}
+size_t XCOFFObjectFile::getFileHeaderSize() const {
+return is64Bit() ? sizeof(XCOFFFileHeader64) : sizeof(XCOFFFileHeader32);
+}
+size_t XCOFFObjectFile::getSectionHeaderSize() const {
+return is64Bit() ? sizeof(XCOFFSectionHeader64) :
+sizeof(XCOFFSectionHeader32);
+}
+bool XCOFFObjectFile::is64Bit() const {
+return Binary::ID_XCOFF64 == getType();
+}
+uint16_t XCOFFObjectFile::getMagic() const {
+return is64Bit() ? fileHeader64()->Magic : fileHeader32()->Magic;
+}
+Expected<DataRefImpl> XCOFFObjectFile::getSectionByNum(int16_t Num) const {
+if (Num <= 0 || Num > getNumberOfSections())
+return errorCodeToError(object_error::invalid_section_index);
+DataRefImpl DRI;
+DRI.p = getWithOffset(getSectionHeaderTableAddress(),
+getSectionHeaderSize() * (Num - 1));
+return DRI;
+}
+Expected<StringRef>
+XCOFFObjectFile::getSymbolSectionName(const XCOFFSymbolEntry *SymEntPtr) const {
+assert(!is64Bit() && "Symbol table support not implemented for 64-bit.");
+int16_t SectionNum = SymEntPtr->SectionNumber;
+switch (SectionNum) {
+case XCOFF::N_DEBUG:
+return "N_DEBUG";
+case XCOFF::N_ABS:
+return "N_ABS";
+case XCOFF::N_UNDEF:
+return "N_UNDEF";
+default:
+Expected<DataRefImpl> SecRef = getSectionByNum(SectionNum);
+if (SecRef)
+return generateStringRef(getSectionNameInternal(SecRef.get()));
+return SecRef.takeError();
+}
+}
+bool XCOFFObjectFile::isReservedSectionNumber(int16_t SectionNumber) {
+return (SectionNumber <= 0 && SectionNumber >= -2);
+}
+uint16_t XCOFFObjectFile::getNumberOfSections() const {
+return is64Bit() ? fileHeader64()->NumberOfSections
+: fileHeader32()->NumberOfSections;
+}
+int32_t XCOFFObjectFile::getTimeStamp() const {
+return is64Bit() ? fileHeader64()->TimeStamp : fileHeader32()->TimeStamp;
+}
+uint16_t XCOFFObjectFile::getOptionalHeaderSize() const {
+return is64Bit() ? fileHeader64()->AuxHeaderSize
+: fileHeader32()->AuxHeaderSize;
+}
+uint32_t XCOFFObjectFile::getSymbolTableOffset32() const {
+return fileHeader32()->SymbolTableOffset;
+}
+int32_t XCOFFObjectFile::getRawNumberOfSymbolTableEntries32() const {
+// As far as symbol table size is concerned, if this field is negative it is
+// to be treated as a 0. However since this field is also used for printing we
+// don't want to truncate any negative values.
+return fileHeader32()->NumberOfSymTableEntries;
+}
+uint32_t XCOFFObjectFile::getLogicalNumberOfSymbolTableEntries32() const {
+return (fileHeader32()->NumberOfSymTableEntries >= 0
+? fileHeader32()->NumberOfSymTableEntries
+: 0);
+}
+uint64_t XCOFFObjectFile::getSymbolTableOffset64() const {
+return fileHeader64()->SymbolTableOffset;
+}
+uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries64() const {
+return fileHeader64()->NumberOfSymTableEntries;
+}
+uint16_t XCOFFObjectFile::getFlags() const {
+return is64Bit() ? fileHeader64()->Flags : fileHeader32()->Flags;
+}
+const char *XCOFFObjectFile::getSectionNameInternal(DataRefImpl Sec) const {
+return is64Bit() ? toSection64(Sec)->Name : toSection32(Sec)->Name;
+}
+uintptr_t XCOFFObjectFile::getSectionHeaderTableAddress() const {
+return reinterpret_cast<uintptr_t>(SectionHeaderTable);
+}
+int32_t XCOFFObjectFile::getSectionFlags(DataRefImpl Sec) const {
+return is64Bit() ? toSection64(Sec)->Flags : toSection32(Sec)->Flags;
+}
+XCOFFObjectFile::XCOFFObjectFile(unsigned int Type, MemoryBufferRef Object)
+: ObjectFile(Type, Object) {
+assert(Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64);
+}
+ArrayRef<XCOFFSectionHeader64> XCOFFObjectFile::sections64() const {
+assert(is64Bit() && "64-bit interface called for non 64-bit file.");
+const XCOFFSectionHeader64 *TablePtr = sectionHeaderTable64();
+return ArrayRef<XCOFFSectionHeader64>(TablePtr,
+TablePtr + getNumberOfSections());
+}
+ArrayRef<XCOFFSectionHeader32> XCOFFObjectFile::sections32() const {
+assert(!is64Bit() && "32-bit interface called for non 32-bit file.");
+const XCOFFSectionHeader32 *TablePtr = sectionHeaderTable32();
+return ArrayRef<XCOFFSectionHeader32>(TablePtr,
+TablePtr + getNumberOfSections());
+}
+Expected<XCOFFStringTable>
+XCOFFObjectFile::parseStringTable(const XCOFFObjectFile *Obj, uint64_t Offset) {
+// If there is a string table, then the buffer must contain at least 4 bytes
+// for the string table's size. Not having a string table is not an error.
+if (auto EC = Binary::checkOffset(
+Obj->Data, reinterpret_cast<uintptr_t>(Obj->base() + Offset), 4))
+return XCOFFStringTable{0, nullptr};
+// Read the size out of the buffer.
+uint32_t Size = support::endian::read32be(Obj->base() + Offset);
+// If the size is less then 4, then the string table is just a size and no
+// string data.
+if (Size <= 4)
+return XCOFFStringTable{4, nullptr};
+auto StringTableOrErr =
+getObject<char>(Obj->Data, Obj->base() + Offset, Size);
+if (Error E = StringTableOrErr.takeError())
+return std::move(E);
+const char *StringTablePtr = StringTableOrErr.get();
+if (StringTablePtr[Size - 1] != '\0')
+return errorCodeToError(object_error::string_table_non_null_end);
+return XCOFFStringTable{Size, StringTablePtr};
+}
+Expected<std::unique_ptr<XCOFFObjectFile>>
+XCOFFObjectFile::create(unsigned Type, MemoryBufferRef MBR) {
+// Can't use make_unique because of the private constructor.
+std::unique_ptr<XCOFFObjectFile> Obj;
+Obj.reset(new XCOFFObjectFile(Type, MBR));
+uint64_t CurOffset = 0;
+const auto *Base = Obj->base();
+MemoryBufferRef Data = Obj->Data;
+// Parse file header.
+auto FileHeaderOrErr =
+getObject<void>(Data, Base + CurOffset, Obj->getFileHeaderSize());
+if (Error E = FileHeaderOrErr.takeError())
+return std::move(E);
+Obj->FileHeader = FileHeaderOrErr.get();
+CurOffset += Obj->getFileHeaderSize();
+// TODO FIXME we don't have support for an optional header yet, so just skip
+// past it.
+CurOffset += Obj->getOptionalHeaderSize();
+// Parse the section header table if it is present.
+if (Obj->getNumberOfSections()) {
+auto SecHeadersOrErr = getObject<void>(Data, Base + CurOffset,
+Obj->getNumberOfSections() *
+Obj->getSectionHeaderSize());
+if (Error E = SecHeadersOrErr.takeError())
+return std::move(E);
+Obj->SectionHeaderTable = SecHeadersOrErr.get();
+}
+// 64-bit object supports only file header and section headers for now.
+if (Obj->is64Bit())
+return std::move(Obj);
+// If there is no symbol table we are done parsing the memory buffer.
+if (Obj->getLogicalNumberOfSymbolTableEntries32() == 0)
+return std::move(Obj);
+// Parse symbol table.
+CurOffset = Obj->fileHeader32()->SymbolTableOffset;
+uint64_t SymbolTableSize = (uint64_t)(sizeof(XCOFFSymbolEntry)) *
+Obj->getLogicalNumberOfSymbolTableEntries32();
+auto SymTableOrErr =
+getObject<XCOFFSymbolEntry>(Data, Base + CurOffset, SymbolTableSize);
+if (Error E = SymTableOrErr.takeError())
+return std::move(E);
+Obj->SymbolTblPtr = SymTableOrErr.get();
+CurOffset += SymbolTableSize;
+// Parse String table.
+Expected<XCOFFStringTable> StringTableOrErr =
+parseStringTable(Obj.get(), CurOffset);
+if (Error E = StringTableOrErr.takeError())
+return std::move(E);
+Obj->StringTable = StringTableOrErr.get();
+return std::move(Obj);
+}
+Expected<std::unique_ptr<ObjectFile>>
+ObjectFile::createXCOFFObjectFile(MemoryBufferRef MemBufRef,
+unsigned FileType) {
+return XCOFFObjectFile::create(FileType, MemBufRef);
+}
+StringRef XCOFFSectionHeader32::getName() const {
+return generateStringRef(Name);
+}
+StringRef XCOFFSectionHeader64::getName() const {
+return generateStringRef(Name);
+}
+} // namespace object
+} // namespace llvm

Mercurial > hg > CbC > CbC_llvm

comparison lib/Object/XCOFFObjectFile.cpp @ 148:63bd29f05246