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llvm-mirror/tools/llvm-readobj/ARMEHABIPrinter.h
Davide Italiano af42944969 [ELF] Convert ELF.h to Expected<T>. 
This has two advantages:
1) We slowly move away from ErrorOr to the new handling interface,
in the hope of having an uniform error handling in LLVM, eventually.
2) We're starting to have *meaningful* error messages for invalid
object ELF files, rather than a generic "parse error". At some point
we should include also the offset to improve the quality of the
diagnostic.

llvm-svn: 287081
2016-11-16 05:10:28 +00:00

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//===--- ARMEHABIPrinter.h - ARM EHABI Unwind Information Printer ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_READOBJ_ARMEHABIPRINTER_H
#define LLVM_TOOLS_LLVM_READOBJ_ARMEHABIPRINTER_H
#include "Error.h"
#include "llvm-readobj.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ELFTypes.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/Support/type_traits.h"
namespace llvm {
namespace ARM {
namespace EHABI {
class OpcodeDecoder {
ScopedPrinter &SW;
raw_ostream &OS;
struct RingEntry {
uint8_t Mask;
uint8_t Value;
void (OpcodeDecoder::*Routine)(const uint8_t *Opcodes, unsigned &OI);
};
static const RingEntry Ring[];
void Decode_00xxxxxx(const uint8_t *Opcodes, unsigned &OI);
void Decode_01xxxxxx(const uint8_t *Opcodes, unsigned &OI);
void Decode_1000iiii_iiiiiiii(const uint8_t *Opcodes, unsigned &OI);
void Decode_10011101(const uint8_t *Opcodes, unsigned &OI);
void Decode_10011111(const uint8_t *Opcodes, unsigned &OI);
void Decode_1001nnnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_10100nnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_10101nnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_10110000(const uint8_t *Opcodes, unsigned &OI);
void Decode_10110001_0000iiii(const uint8_t *Opcodes, unsigned &OI);
void Decode_10110010_uleb128(const uint8_t *Opcodes, unsigned &OI);
void Decode_10110011_sssscccc(const uint8_t *Opcodes, unsigned &OI);
void Decode_101101nn(const uint8_t *Opcodes, unsigned &OI);
void Decode_10111nnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_11000110_sssscccc(const uint8_t *Opcodes, unsigned &OI);
void Decode_11000111_0000iiii(const uint8_t *Opcodes, unsigned &OI);
void Decode_11001000_sssscccc(const uint8_t *Opcodes, unsigned &OI);
void Decode_11001001_sssscccc(const uint8_t *Opcodes, unsigned &OI);
void Decode_11001yyy(const uint8_t *Opcodes, unsigned &OI);
void Decode_11000nnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_11010nnn(const uint8_t *Opcodes, unsigned &OI);
void Decode_11xxxyyy(const uint8_t *Opcodes, unsigned &OI);
void PrintGPR(uint16_t GPRMask);
void PrintRegisters(uint32_t Mask, StringRef Prefix);
public:
OpcodeDecoder(ScopedPrinter &SW) : SW(SW), OS(SW.getOStream()) {}
void Decode(const uint8_t *Opcodes, off_t Offset, size_t Length);
};
const OpcodeDecoder::RingEntry OpcodeDecoder::Ring[] = {
{ 0xc0, 0x00, &OpcodeDecoder::Decode_00xxxxxx },
{ 0xc0, 0x40, &OpcodeDecoder::Decode_01xxxxxx },
{ 0xf0, 0x80, &OpcodeDecoder::Decode_1000iiii_iiiiiiii },
{ 0xff, 0x9d, &OpcodeDecoder::Decode_10011101 },
{ 0xff, 0x9f, &OpcodeDecoder::Decode_10011111 },
{ 0xf0, 0x90, &OpcodeDecoder::Decode_1001nnnn },
{ 0xf8, 0xa0, &OpcodeDecoder::Decode_10100nnn },
{ 0xf8, 0xa8, &OpcodeDecoder::Decode_10101nnn },
{ 0xff, 0xb0, &OpcodeDecoder::Decode_10110000 },
{ 0xff, 0xb1, &OpcodeDecoder::Decode_10110001_0000iiii },
{ 0xff, 0xb2, &OpcodeDecoder::Decode_10110010_uleb128 },
{ 0xff, 0xb3, &OpcodeDecoder::Decode_10110011_sssscccc },
{ 0xfc, 0xb4, &OpcodeDecoder::Decode_101101nn },
{ 0xf8, 0xb8, &OpcodeDecoder::Decode_10111nnn },
{ 0xff, 0xc6, &OpcodeDecoder::Decode_11000110_sssscccc },
{ 0xff, 0xc7, &OpcodeDecoder::Decode_11000111_0000iiii },
{ 0xff, 0xc8, &OpcodeDecoder::Decode_11001000_sssscccc },
{ 0xff, 0xc9, &OpcodeDecoder::Decode_11001001_sssscccc },
{ 0xc8, 0xc8, &OpcodeDecoder::Decode_11001yyy },
{ 0xf8, 0xc0, &OpcodeDecoder::Decode_11000nnn },
{ 0xf8, 0xd0, &OpcodeDecoder::Decode_11010nnn },
{ 0xc0, 0xc0, &OpcodeDecoder::Decode_11xxxyyy },
};
void OpcodeDecoder::Decode_00xxxxxx(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; vsp = vsp + %u\n", Opcode,
((Opcode & 0x3f) << 2) + 4);
}
void OpcodeDecoder::Decode_01xxxxxx(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; vsp = vsp - %u\n", Opcode,
((Opcode & 0x3f) << 2) + 4);
}
void OpcodeDecoder::Decode_1000iiii_iiiiiiii(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
uint16_t GPRMask = (Opcode1 << 4) | ((Opcode0 & 0x0f) << 12);
SW.startLine()
<< format("0x%02X 0x%02X ; %s",
Opcode0, Opcode1, GPRMask ? "pop " : "refuse to unwind");
if (GPRMask)
PrintGPR(GPRMask);
OS << '\n';
}
void OpcodeDecoder::Decode_10011101(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; reserved (ARM MOVrr)\n", Opcode);
}
void OpcodeDecoder::Decode_10011111(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; reserved (WiMMX MOVrr)\n", Opcode);
}
void OpcodeDecoder::Decode_1001nnnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; vsp = r%u\n", Opcode, (Opcode & 0x0f));
}
void OpcodeDecoder::Decode_10100nnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; pop ", Opcode);
PrintGPR((((1 << ((Opcode & 0x7) + 1)) - 1) << 4));
OS << '\n';
}
void OpcodeDecoder::Decode_10101nnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; pop ", Opcode);
PrintGPR((((1 << ((Opcode & 0x7) + 1)) - 1) << 4) | (1 << 14));
OS << '\n';
}
void OpcodeDecoder::Decode_10110000(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; finish\n", Opcode);
}
void OpcodeDecoder::Decode_10110001_0000iiii(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine()
<< format("0x%02X 0x%02X ; %s", Opcode0, Opcode1,
((Opcode1 & 0xf0) || Opcode1 == 0x00) ? "spare" : "pop ");
if (((Opcode1 & 0xf0) == 0x00) && Opcode1)
PrintGPR((Opcode1 & 0x0f));
OS << '\n';
}
void OpcodeDecoder::Decode_10110010_uleb128(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ", Opcode);
SmallVector<uint8_t, 4> ULEB;
do { ULEB.push_back(Opcodes[OI ^ 3]); } while (Opcodes[OI++ ^ 3] & 0x80);
for (unsigned BI = 0, BE = ULEB.size(); BI != BE; ++BI)
OS << format("0x%02X ", ULEB[BI]);
uint64_t Value = 0;
for (unsigned BI = 0, BE = ULEB.size(); BI != BE; ++BI)
Value = Value | ((ULEB[BI] & 0x7f) << (7 * BI));
OS << format("; vsp = vsp + %" PRIu64 "\n", 0x204 + (Value << 2));
}
void OpcodeDecoder::Decode_10110011_sssscccc(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
uint8_t Start = ((Opcode1 & 0xf0) >> 4);
uint8_t Count = ((Opcode1 & 0x0f) >> 0);
PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
OS << '\n';
}
void OpcodeDecoder::Decode_101101nn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; spare\n", Opcode);
}
void OpcodeDecoder::Decode_10111nnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; pop ", Opcode);
PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 8), "d");
OS << '\n';
}
void OpcodeDecoder::Decode_11000110_sssscccc(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
uint8_t Start = ((Opcode1 & 0xf0) >> 4);
uint8_t Count = ((Opcode1 & 0x0f) >> 0);
PrintRegisters((((1 << (Count + 1)) - 1) << Start), "wR");
OS << '\n';
}
void OpcodeDecoder::Decode_11000111_0000iiii(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine()
<< format("0x%02X 0x%02X ; %s", Opcode0, Opcode1,
((Opcode1 & 0xf0) || Opcode1 == 0x00) ? "spare" : "pop ");
if ((Opcode1 & 0xf0) == 0x00 && Opcode1)
PrintRegisters(Opcode1 & 0x0f, "wCGR");
OS << '\n';
}
void OpcodeDecoder::Decode_11001000_sssscccc(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
uint8_t Start = 16 + ((Opcode1 & 0xf0) >> 4);
uint8_t Count = ((Opcode1 & 0x0f) >> 0);
PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
OS << '\n';
}
void OpcodeDecoder::Decode_11001001_sssscccc(const uint8_t *Opcodes,
unsigned &OI) {
uint8_t Opcode0 = Opcodes[OI++ ^ 3];
uint8_t Opcode1 = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
uint8_t Start = ((Opcode1 & 0xf0) >> 4);
uint8_t Count = ((Opcode1 & 0x0f) >> 0);
PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
OS << '\n';
}
void OpcodeDecoder::Decode_11001yyy(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; spare\n", Opcode);
}
void OpcodeDecoder::Decode_11000nnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; pop ", Opcode);
PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 10), "wR");
OS << '\n';
}
void OpcodeDecoder::Decode_11010nnn(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; pop ", Opcode);
PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 8), "d");
OS << '\n';
}
void OpcodeDecoder::Decode_11xxxyyy(const uint8_t *Opcodes, unsigned &OI) {
uint8_t Opcode = Opcodes[OI++ ^ 3];
SW.startLine() << format("0x%02X ; spare\n", Opcode);
}
void OpcodeDecoder::PrintGPR(uint16_t GPRMask) {
static const char *GPRRegisterNames[16] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"fp", "ip", "sp", "lr", "pc"
};
OS << '{';
bool Comma = false;
for (unsigned RI = 0, RE = 17; RI < RE; ++RI) {
if (GPRMask & (1 << RI)) {
if (Comma)
OS << ", ";
OS << GPRRegisterNames[RI];
Comma = true;
}
}
OS << '}';
}
void OpcodeDecoder::PrintRegisters(uint32_t VFPMask, StringRef Prefix) {
OS << '{';
bool Comma = false;
for (unsigned RI = 0, RE = 32; RI < RE; ++RI) {
if (VFPMask & (1 << RI)) {
if (Comma)
OS << ", ";
OS << Prefix << RI;
Comma = true;
}
}
OS << '}';
}
void OpcodeDecoder::Decode(const uint8_t *Opcodes, off_t Offset, size_t Length) {
for (unsigned OCI = Offset; OCI < Length + Offset; ) {
bool Decoded = false;
for (unsigned REI = 0, REE = array_lengthof(Ring);
REI != REE && !Decoded; ++REI) {
if ((Opcodes[OCI ^ 3] & Ring[REI].Mask) == Ring[REI].Value) {
(this->*Ring[REI].Routine)(Opcodes, OCI);
Decoded = true;
break;
}
}
if (!Decoded)
SW.startLine() << format("0x%02X ; reserved\n", Opcodes[OCI++ ^ 3]);
}
}
template <typename ET>
class PrinterContext {
typedef typename object::ELFFile<ET>::Elf_Sym Elf_Sym;
typedef typename object::ELFFile<ET>::Elf_Shdr Elf_Shdr;
typedef typename object::ELFFile<ET>::Elf_Rel Elf_Rel;
typedef typename object::ELFFile<ET>::Elf_Word Elf_Word;
ScopedPrinter &SW;
const object::ELFFile<ET> *ELF;
const Elf_Shdr *Symtab;
ArrayRef<Elf_Word> ShndxTable;
static const size_t IndexTableEntrySize;
static uint64_t PREL31(uint32_t Address, uint32_t Place) {
uint64_t Location = Address & 0x7fffffff;
if (Location & 0x04000000)
Location |= (uint64_t) ~0x7fffffff;
return Location + Place;
}
ErrorOr<StringRef> FunctionAtAddress(unsigned Section, uint64_t Address) const;
const Elf_Shdr *FindExceptionTable(unsigned IndexTableIndex,
off_t IndexTableOffset) const;
void PrintIndexTable(unsigned SectionIndex, const Elf_Shdr *IT) const;
void PrintExceptionTable(const Elf_Shdr *IT, const Elf_Shdr *EHT,
uint64_t TableEntryOffset) const;
void PrintOpcodes(const uint8_t *Entry, size_t Length, off_t Offset) const;
public:
PrinterContext(ScopedPrinter &SW, const object::ELFFile<ET> *ELF,
const Elf_Shdr *Symtab)
: SW(SW), ELF(ELF), Symtab(Symtab) {}
void PrintUnwindInformation() const;
};
template <typename ET>
const size_t PrinterContext<ET>::IndexTableEntrySize = 8;
template <typename ET>
ErrorOr<StringRef>
PrinterContext<ET>::FunctionAtAddress(unsigned Section,
uint64_t Address) const {
auto StrTableOrErr = ELF->getStringTableForSymtab(*Symtab);
if (!StrTableOrErr)
error(StrTableOrErr.takeError());
StringRef StrTable = *StrTableOrErr;
for (const Elf_Sym &Sym : unwrapOrError(ELF->symbols(Symtab)))
if (Sym.st_shndx == Section && Sym.st_value == Address &&
Sym.getType() == ELF::STT_FUNC) {
auto NameOrErr = Sym.getName(StrTable);
if (!NameOrErr) {
// TODO: Actually report errors helpfully.
consumeError(NameOrErr.takeError());
return readobj_error::unknown_symbol;
}
return *NameOrErr;
}
return readobj_error::unknown_symbol;
}
template <typename ET>
const typename object::ELFFile<ET>::Elf_Shdr *
PrinterContext<ET>::FindExceptionTable(unsigned IndexSectionIndex,
off_t IndexTableOffset) const {
/// Iterate through the sections, searching for the relocation section
/// associated with the unwind index table section specified by
/// IndexSectionIndex. Iterate the associated section searching for the
/// relocation associated with the index table entry specified by
/// IndexTableOffset. The symbol is the section symbol for the exception
/// handling table. Use this symbol to recover the actual exception handling
/// table.
for (const Elf_Shdr &Sec : unwrapOrError(ELF->sections())) {
if (Sec.sh_type != ELF::SHT_REL || Sec.sh_info != IndexSectionIndex)
continue;
auto SymTabOrErr = ELF->getSection(Sec.sh_link);
if (!SymTabOrErr)
error(SymTabOrErr.takeError());
const Elf_Shdr *SymTab = *SymTabOrErr;
for (const Elf_Rel &R : unwrapOrError(ELF->rels(&Sec))) {
if (R.r_offset != static_cast<unsigned>(IndexTableOffset))
continue;
typename object::ELFFile<ET>::Elf_Rela RelA;
RelA.r_offset = R.r_offset;
RelA.r_info = R.r_info;
RelA.r_addend = 0;
const Elf_Sym *Symbol =
unwrapOrError(ELF->getRelocationSymbol(&RelA, SymTab));
auto Ret = ELF->getSection(Symbol, SymTab, ShndxTable);
if (!Ret)
report_fatal_error(errorToErrorCode(Ret.takeError()).message());
return *Ret;
}
}
return nullptr;
}
template <typename ET>
void PrinterContext<ET>::PrintExceptionTable(const Elf_Shdr *IT,
const Elf_Shdr *EHT,
uint64_t TableEntryOffset) const {
Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(EHT);
if (!Contents)
return;
/// ARM EHABI Section 6.2 - The generic model
///
/// An exception-handling table entry for the generic model is laid out as:
///
/// 3 3
/// 1 0 0
/// +-+------------------------------+
/// |0| personality routine offset |
/// +-+------------------------------+
/// | personality routine data ... |
///
///
/// ARM EHABI Section 6.3 - The ARM-defined compact model
///
/// An exception-handling table entry for the compact model looks like:
///
/// 3 3 2 2 2 2
/// 1 0 8 7 4 3 0
/// +-+---+----+-----------------------+
/// |1| 0 | Ix | data for pers routine |
/// +-+---+----+-----------------------+
/// | more personality routine data |
const support::ulittle32_t Word =
*reinterpret_cast<const support::ulittle32_t *>(Contents->data() + TableEntryOffset);
if (Word & 0x80000000) {
SW.printString("Model", StringRef("Compact"));
unsigned PersonalityIndex = (Word & 0x0f000000) >> 24;
SW.printNumber("PersonalityIndex", PersonalityIndex);
switch (PersonalityIndex) {
case AEABI_UNWIND_CPP_PR0:
PrintOpcodes(Contents->data() + TableEntryOffset, 3, 1);
break;
case AEABI_UNWIND_CPP_PR1:
case AEABI_UNWIND_CPP_PR2:
unsigned AdditionalWords = (Word & 0x00ff0000) >> 16;
PrintOpcodes(Contents->data() + TableEntryOffset, 2 + 4 * AdditionalWords,
2);
break;
}
} else {
SW.printString("Model", StringRef("Generic"));
uint64_t Address = PREL31(Word, EHT->sh_addr);
SW.printHex("PersonalityRoutineAddress", Address);
if (ErrorOr<StringRef> Name = FunctionAtAddress(EHT->sh_link, Address))
SW.printString("PersonalityRoutineName", *Name);
}
}
template <typename ET>
void PrinterContext<ET>::PrintOpcodes(const uint8_t *Entry,
size_t Length, off_t Offset) const {
ListScope OCC(SW, "Opcodes");
OpcodeDecoder(OCC.W).Decode(Entry, Offset, Length);
}
template <typename ET>
void PrinterContext<ET>::PrintIndexTable(unsigned SectionIndex,
const Elf_Shdr *IT) const {
Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(IT);
if (!Contents)
return;
/// ARM EHABI Section 5 - Index Table Entries
/// * The first word contains a PREL31 offset to the start of a function with
/// bit 31 clear
/// * The second word contains one of:
/// - The PREL31 offset of the start of the table entry for the function,
/// with bit 31 clear
/// - The exception-handling table entry itself with bit 31 set
/// - The special bit pattern EXIDX_CANTUNWIND, indicating that associated
/// frames cannot be unwound
const support::ulittle32_t *Data =
reinterpret_cast<const support::ulittle32_t *>(Contents->data());
const unsigned Entries = IT->sh_size / IndexTableEntrySize;
ListScope E(SW, "Entries");
for (unsigned Entry = 0; Entry < Entries; ++Entry) {
DictScope E(SW, "Entry");
const support::ulittle32_t Word0 =
Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 0];
const support::ulittle32_t Word1 =
Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 1];
if (Word0 & 0x80000000) {
errs() << "corrupt unwind data in section " << SectionIndex << "\n";
continue;
}
const uint64_t Offset = PREL31(Word0, IT->sh_addr);
SW.printHex("FunctionAddress", Offset);
if (ErrorOr<StringRef> Name = FunctionAtAddress(IT->sh_link, Offset))
SW.printString("FunctionName", *Name);
if (Word1 == EXIDX_CANTUNWIND) {
SW.printString("Model", StringRef("CantUnwind"));
continue;
}
if (Word1 & 0x80000000) {
SW.printString("Model", StringRef("Compact (Inline)"));
unsigned PersonalityIndex = (Word1 & 0x0f000000) >> 24;
SW.printNumber("PersonalityIndex", PersonalityIndex);
PrintOpcodes(Contents->data() + Entry * IndexTableEntrySize + 4, 3, 1);
} else {
const Elf_Shdr *EHT =
FindExceptionTable(SectionIndex, Entry * IndexTableEntrySize + 4);
if (auto Name = ELF->getSectionName(EHT))
SW.printString("ExceptionHandlingTable", *Name);
uint64_t TableEntryOffset = PREL31(Word1, IT->sh_addr);
SW.printHex("TableEntryOffset", TableEntryOffset);
PrintExceptionTable(IT, EHT, TableEntryOffset);
}
}
}
template <typename ET>
void PrinterContext<ET>::PrintUnwindInformation() const {
DictScope UI(SW, "UnwindInformation");
int SectionIndex = 0;
for (const Elf_Shdr &Sec : unwrapOrError(ELF->sections())) {
if (Sec.sh_type == ELF::SHT_ARM_EXIDX) {
DictScope UIT(SW, "UnwindIndexTable");
SW.printNumber("SectionIndex", SectionIndex);
if (auto SectionName = ELF->getSectionName(&Sec))
SW.printString("SectionName", *SectionName);
SW.printHex("SectionOffset", Sec.sh_offset);
PrintIndexTable(SectionIndex, &Sec);
}
++SectionIndex;
}
}
}
}
}
#endif
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