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llvm-mirror/tools/llvm-readobj/DwarfCFIEHPrinter.h
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===--- DwarfCFIEHPrinter.h - DWARF-based Unwind Information Printer -----===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_READOBJ_DWARFCFIEHPRINTER_H
#define LLVM_TOOLS_LLVM_READOBJ_DWARFCFIEHPRINTER_H
#include "Error.h"
#include "llvm-readobj.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ELFTypes.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/Debug.h"
#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/type_traits.h"
namespace llvm {
namespace DwarfCFIEH {
template <typename ELFT>
class PrinterContext {
ScopedPrinter &W;
const object::ELFObjectFile<ELFT> *ObjF;
void printEHFrameHdr(uint64_t Offset, uint64_t Address, uint64_t Size) const;
void printEHFrame(const typename ELFT::Shdr *EHFrameShdr) const;
public:
PrinterContext(ScopedPrinter &W, const object::ELFObjectFile<ELFT> *ObjF)
: W(W), ObjF(ObjF) {}
void printUnwindInformation() const;
};
template <class ELFO>
static const typename ELFO::Elf_Shdr *findSectionByAddress(const ELFO *Obj,
uint64_t Addr) {
auto Sections = Obj->sections();
if (Error E = Sections.takeError())
reportError(toString(std::move(E)));
for (const auto &Shdr : *Sections)
if (Shdr.sh_addr == Addr)
return &Shdr;
return nullptr;
}
template <typename ELFT>
void PrinterContext<ELFT>::printUnwindInformation() const {
const object::ELFFile<ELFT> *Obj = ObjF->getELFFile();
const typename ELFT::Phdr *EHFramePhdr = nullptr;
auto PHs = Obj->program_headers();
if (Error E = PHs.takeError())
reportError(toString(std::move(E)));
for (const auto &Phdr : *PHs) {
if (Phdr.p_type == ELF::PT_GNU_EH_FRAME) {
EHFramePhdr = &Phdr;
if (Phdr.p_memsz != Phdr.p_filesz)
reportError("p_memsz does not match p_filesz for GNU_EH_FRAME");
break;
}
}
if (EHFramePhdr)
printEHFrameHdr(EHFramePhdr->p_offset, EHFramePhdr->p_vaddr,
EHFramePhdr->p_memsz);
auto Sections = Obj->sections();
if (Error E = Sections.takeError())
reportError(toString(std::move(E)));
for (const auto &Shdr : *Sections) {
auto SectionName = Obj->getSectionName(&Shdr);
if (Error E = SectionName.takeError())
reportError(toString(std::move(E)));
if (*SectionName == ".eh_frame")
printEHFrame(&Shdr);
}
}
template <typename ELFT>
void PrinterContext<ELFT>::printEHFrameHdr(uint64_t EHFrameHdrOffset,
uint64_t EHFrameHdrAddress,
uint64_t EHFrameHdrSize) const {
ListScope L(W, "EH_FRAME Header");
W.startLine() << format("Address: 0x%" PRIx64 "\n", EHFrameHdrAddress);
W.startLine() << format("Offset: 0x%" PRIx64 "\n", EHFrameHdrOffset);
W.startLine() << format("Size: 0x%" PRIx64 "\n", EHFrameHdrSize);
const object::ELFFile<ELFT> *Obj = ObjF->getELFFile();
const auto *EHFrameHdrShdr = findSectionByAddress(Obj, EHFrameHdrAddress);
if (EHFrameHdrShdr) {
auto SectionName = Obj->getSectionName(EHFrameHdrShdr);
if (Error E = SectionName.takeError())
reportError(toString(std::move(E)));
W.printString("Corresponding Section", *SectionName);
}
DataExtractor DE(
StringRef(reinterpret_cast<const char *>(Obj->base()) + EHFrameHdrOffset,
EHFrameHdrSize),
ELFT::TargetEndianness == support::endianness::little,
ELFT::Is64Bits ? 8 : 4);
DictScope D(W, "Header");
uint32_t Offset = 0;
auto Version = DE.getU8(&Offset);
W.printNumber("version", Version);
if (Version != 1)
reportError("only version 1 of .eh_frame_hdr is supported");
uint64_t EHFramePtrEnc = DE.getU8(&Offset);
W.startLine() << format("eh_frame_ptr_enc: 0x%" PRIx64 "\n", EHFramePtrEnc);
if (EHFramePtrEnc != (dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4))
reportError("unexpected encoding eh_frame_ptr_enc");
uint64_t FDECountEnc = DE.getU8(&Offset);
W.startLine() << format("fde_count_enc: 0x%" PRIx64 "\n", FDECountEnc);
if (FDECountEnc != dwarf::DW_EH_PE_udata4)
reportError("unexpected encoding fde_count_enc");
uint64_t TableEnc = DE.getU8(&Offset);
W.startLine() << format("table_enc: 0x%" PRIx64 "\n", TableEnc);
if (TableEnc != (dwarf::DW_EH_PE_datarel | dwarf::DW_EH_PE_sdata4))
reportError("unexpected encoding table_enc");
auto EHFramePtr = DE.getSigned(&Offset, 4) + EHFrameHdrAddress + 4;
W.startLine() << format("eh_frame_ptr: 0x%" PRIx64 "\n", EHFramePtr);
auto FDECount = DE.getUnsigned(&Offset, 4);
W.printNumber("fde_count", FDECount);
unsigned NumEntries = 0;
uint64_t PrevPC = 0;
while (Offset + 8 <= EHFrameHdrSize && NumEntries < FDECount) {
DictScope D(W, std::string("entry ") + std::to_string(NumEntries));
auto InitialPC = DE.getSigned(&Offset, 4) + EHFrameHdrAddress;
W.startLine() << format("initial_location: 0x%" PRIx64 "\n", InitialPC);
auto Address = DE.getSigned(&Offset, 4) + EHFrameHdrAddress;
W.startLine() << format("address: 0x%" PRIx64 "\n", Address);
if (InitialPC < PrevPC)
reportError("initial_location is out of order");
PrevPC = InitialPC;
++NumEntries;
}
}
template <typename ELFT>
void PrinterContext<ELFT>::printEHFrame(
const typename ELFT::Shdr *EHFrameShdr) const {
uint64_t Address = EHFrameShdr->sh_addr;
uint64_t ShOffset = EHFrameShdr->sh_offset;
W.startLine() << format(".eh_frame section at offset 0x%" PRIx64
" address 0x%" PRIx64 ":\n",
ShOffset, Address);
W.indent();
const object::ELFFile<ELFT> *Obj = ObjF->getELFFile();
auto Result = Obj->getSectionContents(EHFrameShdr);
if (Error E = Result.takeError())
reportError(toString(std::move(E)));
auto Contents = Result.get();
DWARFDataExtractor DE(
StringRef(reinterpret_cast<const char *>(Contents.data()),
Contents.size()),
ELFT::TargetEndianness == support::endianness::little,
ELFT::Is64Bits ? 8 : 4);
DWARFDebugFrame EHFrame(Triple::ArchType(ObjF->getArch()), /*IsEH=*/true,
/*EHFrameAddress=*/Address);
EHFrame.parse(DE);
for (const auto &Entry : EHFrame) {
if (const auto *CIE = dyn_cast<dwarf::CIE>(&Entry)) {
W.startLine() << format("[0x%" PRIx64 "] CIE length=%" PRIu64 "\n",
Address + CIE->getOffset(),
CIE->getLength());
W.indent();
W.printNumber("version", CIE->getVersion());
W.printString("augmentation", CIE->getAugmentationString());
W.printNumber("code_alignment_factor", CIE->getCodeAlignmentFactor());
W.printNumber("data_alignment_factor", CIE->getDataAlignmentFactor());
W.printNumber("return_address_register", CIE->getReturnAddressRegister());
W.getOStream() << "\n";
W.startLine() << "Program:\n";
W.indent();
CIE->cfis().dump(W.getOStream(), nullptr, W.getIndentLevel());
W.unindent();
W.unindent();
W.getOStream() << "\n";
} else if (const auto *FDE = dyn_cast<dwarf::FDE>(&Entry)) {
W.startLine() << format("[0x%" PRIx64 "] FDE length=%" PRIu64
" cie=[0x%" PRIx64 "]\n",
Address + FDE->getOffset(),
FDE->getLength(),
Address + FDE->getLinkedCIE()->getOffset());
W.indent();
W.startLine() << format("initial_location: 0x%" PRIx64 "\n",
FDE->getInitialLocation());
W.startLine()
<< format("address_range: 0x%" PRIx64 " (end : 0x%" PRIx64 ")\n",
FDE->getAddressRange(),
FDE->getInitialLocation() + FDE->getAddressRange());
W.getOStream() << "\n";
W.startLine() << "Program:\n";
W.indent();
FDE->cfis().dump(W.getOStream(), nullptr, W.getIndentLevel());
W.unindent();
W.unindent();
W.getOStream() << "\n";
} else {
llvm_unreachable("unexpected DWARF frame kind");
}
}
W.unindent();
}
}
}
#endif
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