llvm/lldb/source/Symbol/ArmUnwindInfo.cpp

//===-- ArmUnwindInfo.cpp -------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include <vector>

#include "Utility/ARM_DWARF_Registers.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/ArmUnwindInfo.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Utility/Endian.h"

/*
 * Unwind information reader and parser for the ARM exception handling ABI
 *
 * Implemented based on:
 *     Exception Handling ABI for the ARM Architecture
 *     Document number: ARM IHI 0038A (current through ABI r2.09)
 *     Date of Issue: 25th January 2007, reissued 30th November 2012
 *     http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038a/IHI0038A_ehabi.pdf
 */

usingnamespacelldb;
usingnamespacelldb_private;

// Converts a prel31 value to lldb::addr_t with sign extension
static addr_t Prel31ToAddr(uint32_t prel31) { … }

ArmUnwindInfo::ArmExidxEntry::ArmExidxEntry(uint32_t f, lldb::addr_t a,
                                            uint32_t d)
    : … { … }

bool ArmUnwindInfo::ArmExidxEntry::operator<(const ArmExidxEntry &other) const { … }

ArmUnwindInfo::ArmUnwindInfo(ObjectFile &objfile, SectionSP &arm_exidx,
                             SectionSP &arm_extab)
    : … { … }

ArmUnwindInfo::~ArmUnwindInfo() = default;

// Read a byte from the unwind instruction stream with the given offset. Custom
// function is required because have to red in order of significance within
// their containing word (most significant byte first) and in increasing word
// address order.
uint8_t ArmUnwindInfo::GetByteAtOffset(const uint32_t *data,
                                       uint16_t offset) const { … }

uint64_t ArmUnwindInfo::GetULEB128(const uint32_t *data, uint16_t &offset,
                                   uint16_t max_offset) const { … }

bool ArmUnwindInfo::GetUnwindPlan(Target &target, const Address &addr,
                                  UnwindPlan &unwind_plan) { … }

const uint8_t *
ArmUnwindInfo::GetExceptionHandlingTableEntry(const Address &addr) { … }