Revert "Revert "Revert "Revert "Add BacktraceOffline for offline backtracing.""""
This reverts commit 94ece83270deca76c69f5755f8c0ff5c859341fd.
Change-Id: Ie06465c89a5fc115517130f9f2904cc855973155
diff --git a/libbacktrace/BacktraceOffline.cpp b/libbacktrace/BacktraceOffline.cpp
new file mode 100644
index 0000000..27dfb83
--- /dev/null
+++ b/libbacktrace/BacktraceOffline.cpp
@@ -0,0 +1,636 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "BacktraceOffline.h"
+
+extern "C" {
+#define UNW_REMOTE_ONLY
+#include <dwarf.h>
+}
+
+#include <stdint.h>
+#include <string.h>
+#include <sys/types.h>
+#include <ucontext.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include <backtrace/Backtrace.h>
+#include <backtrace/BacktraceMap.h>
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+
+#include <llvm/ADT/StringRef.h>
+#include <llvm/Object/Binary.h>
+#include <llvm/Object/ELFObjectFile.h>
+#include <llvm/Object/ObjectFile.h>
+
+#pragma clang diagnostic pop
+
+#include "BacktraceLog.h"
+
+void Space::Clear() {
+ start = 0;
+ end = 0;
+ data = nullptr;
+}
+
+size_t Space::Read(uint64_t addr, uint8_t* buffer, size_t size) {
+ if (addr >= start && addr < end) {
+ size_t read_size = std::min(size, static_cast<size_t>(end - addr));
+ memcpy(buffer, data + (addr - start), read_size);
+ return read_size;
+ }
+ return 0;
+}
+
+static int FindProcInfo(unw_addr_space_t addr_space, unw_word_t ip, unw_proc_info* proc_info,
+ int need_unwind_info, void* arg) {
+ BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
+ bool result = backtrace->FindProcInfo(addr_space, ip, proc_info, need_unwind_info);
+ return result ? 0 : -UNW_EINVAL;
+}
+
+static void PutUnwindInfo(unw_addr_space_t, unw_proc_info_t*, void*) {
+}
+
+static int GetDynInfoListAddr(unw_addr_space_t, unw_word_t*, void*) {
+ return -UNW_ENOINFO;
+}
+
+static int AccessMem(unw_addr_space_t, unw_word_t addr, unw_word_t* value, int write, void* arg) {
+ if (write == 1) {
+ return -UNW_EINVAL;
+ }
+ BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
+ *value = 0;
+ size_t read_size = backtrace->Read(addr, reinterpret_cast<uint8_t*>(value), sizeof(unw_word_t));
+ // Strictly we should check if read_size matches sizeof(unw_word_t), but it is possible in
+ // .eh_frame_hdr that the section can end at a position not aligned in sizeof(unw_word_t), and
+ // we should permit the read at the end of the section.
+ return (read_size > 0u ? 0 : -UNW_EINVAL);
+}
+
+static int AccessReg(unw_addr_space_t, unw_regnum_t unwind_reg, unw_word_t* value, int write,
+ void* arg) {
+ if (write == 1) {
+ return -UNW_EINVAL;
+ }
+ BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
+ uint64_t reg_value;
+ bool result = backtrace->ReadReg(unwind_reg, ®_value);
+ if (result) {
+ *value = static_cast<unw_word_t>(reg_value);
+ }
+ return result ? 0 : -UNW_EINVAL;
+}
+
+static int AccessFpReg(unw_addr_space_t, unw_regnum_t, unw_fpreg_t*, int, void*) {
+ return -UNW_EINVAL;
+}
+
+static int Resume(unw_addr_space_t, unw_cursor_t*, void*) {
+ return -UNW_EINVAL;
+}
+
+static int GetProcName(unw_addr_space_t, unw_word_t, char*, size_t, unw_word_t*, void*) {
+ return -UNW_EINVAL;
+}
+
+static unw_accessors_t accessors = {
+ .find_proc_info = FindProcInfo,
+ .put_unwind_info = PutUnwindInfo,
+ .get_dyn_info_list_addr = GetDynInfoListAddr,
+ .access_mem = AccessMem,
+ .access_reg = AccessReg,
+ .access_fpreg = AccessFpReg,
+ .resume = Resume,
+ .get_proc_name = GetProcName,
+};
+
+bool BacktraceOffline::Unwind(size_t num_ignore_frames, ucontext_t* context) {
+ if (context == nullptr) {
+ BACK_LOGW("The context is needed for offline backtracing.");
+ return false;
+ }
+ context_ = context;
+
+ unw_addr_space_t addr_space = unw_create_addr_space(&accessors, 0);
+ unw_cursor_t cursor;
+ int ret = unw_init_remote(&cursor, addr_space, this);
+ if (ret != 0) {
+ BACK_LOGW("unw_init_remote failed %d", ret);
+ unw_destroy_addr_space(addr_space);
+ return false;
+ }
+ size_t num_frames = 0;
+ do {
+ unw_word_t pc;
+ ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
+ if (ret < 0) {
+ BACK_LOGW("Failed to read IP %d", ret);
+ break;
+ }
+ unw_word_t sp;
+ ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
+ if (ret < 0) {
+ BACK_LOGW("Failed to read SP %d", ret);
+ break;
+ }
+
+ if (num_ignore_frames == 0) {
+ frames_.resize(num_frames + 1);
+ backtrace_frame_data_t* frame = &frames_[num_frames];
+ frame->num = num_frames;
+ frame->pc = static_cast<uintptr_t>(pc);
+ frame->sp = static_cast<uintptr_t>(sp);
+ frame->stack_size = 0;
+
+ if (num_frames > 0) {
+ backtrace_frame_data_t* prev = &frames_[num_frames - 1];
+ prev->stack_size = frame->sp - prev->sp;
+ }
+ frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
+ FillInMap(frame->pc, &frame->map);
+ num_frames++;
+ } else {
+ num_ignore_frames--;
+ }
+ ret = unw_step(&cursor);
+ } while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
+
+ unw_destroy_addr_space(addr_space);
+ context_ = nullptr;
+ return true;
+}
+
+bool BacktraceOffline::ReadWord(uintptr_t ptr, word_t* out_value) {
+ size_t bytes_read = Read(ptr, reinterpret_cast<uint8_t*>(out_value), sizeof(word_t));
+ return bytes_read == sizeof(word_t);
+}
+
+size_t BacktraceOffline::Read(uintptr_t addr, uint8_t* buffer, size_t bytes) {
+ // Normally, libunwind needs stack information and call frame information to do remote unwinding.
+ // If call frame information is stored in .debug_frame, libunwind can read it from file
+ // by itself. If call frame information is stored in .eh_frame, we need to provide data in
+ // .eh_frame/.eh_frame_hdr sections.
+ // The order of readings below doesn't matter, as the spaces don't overlap with each other.
+ size_t read_size = eh_frame_hdr_space_.Read(addr, buffer, bytes);
+ if (read_size != 0) {
+ return read_size;
+ }
+ read_size = eh_frame_space_.Read(addr, buffer, bytes);
+ if (read_size != 0) {
+ return read_size;
+ }
+ read_size = stack_space_.Read(addr, buffer, bytes);
+ return read_size;
+}
+
+static bool FileOffsetToVaddr(
+ const std::vector<DebugFrameInfo::EhFrame::ProgramHeader>& program_headers,
+ uint64_t file_offset, uint64_t* vaddr) {
+ for (auto& header : program_headers) {
+ if (file_offset >= header.file_offset && file_offset < header.file_offset + header.file_size) {
+ // TODO: Consider load_bias?
+ *vaddr = file_offset - header.file_offset + header.vaddr;
+ return true;
+ }
+ }
+ return false;
+}
+
+bool BacktraceOffline::FindProcInfo(unw_addr_space_t addr_space, uint64_t ip,
+ unw_proc_info_t* proc_info, int need_unwind_info) {
+ backtrace_map_t map;
+ FillInMap(ip, &map);
+ if (!BacktraceMap::IsValid(map)) {
+ return false;
+ }
+ const std::string& filename = map.name;
+ DebugFrameInfo* debug_frame = GetDebugFrameInFile(filename);
+ if (debug_frame == nullptr) {
+ return false;
+ }
+ if (debug_frame->is_eh_frame) {
+ uint64_t ip_offset = ip - map.start + map.offset;
+ uint64_t ip_vaddr; // vaddr in the elf file.
+ bool result = FileOffsetToVaddr(debug_frame->eh_frame.program_headers, ip_offset, &ip_vaddr);
+ if (!result) {
+ return false;
+ }
+ // Calculate the addresses where .eh_frame_hdr and .eh_frame stay when the process was running.
+ eh_frame_hdr_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_hdr_vaddr;
+ eh_frame_hdr_space_.end =
+ eh_frame_hdr_space_.start + debug_frame->eh_frame.eh_frame_hdr_data.size();
+ eh_frame_hdr_space_.data = debug_frame->eh_frame.eh_frame_hdr_data.data();
+
+ eh_frame_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_vaddr;
+ eh_frame_space_.end = eh_frame_space_.start + debug_frame->eh_frame.eh_frame_data.size();
+ eh_frame_space_.data = debug_frame->eh_frame.eh_frame_data.data();
+
+ unw_dyn_info di;
+ memset(&di, '\0', sizeof(di));
+ di.start_ip = map.start;
+ di.end_ip = map.end;
+ di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
+ di.u.rti.name_ptr = 0;
+ di.u.rti.segbase = eh_frame_hdr_space_.start;
+ di.u.rti.table_data =
+ eh_frame_hdr_space_.start + debug_frame->eh_frame.fde_table_offset_in_eh_frame_hdr;
+ di.u.rti.table_len = (eh_frame_hdr_space_.end - di.u.rti.table_data) / sizeof(unw_word_t);
+ int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
+ return ret == 0;
+ }
+
+ eh_frame_hdr_space_.Clear();
+ eh_frame_space_.Clear();
+ unw_dyn_info_t di;
+ unw_word_t segbase = map.start - map.offset;
+ int found = dwarf_find_debug_frame(0, &di, ip, segbase, filename.c_str(), map.start, map.end);
+ if (found == 1) {
+ int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
+ return ret == 0;
+ }
+ return false;
+}
+
+bool BacktraceOffline::ReadReg(size_t reg, uint64_t* value) {
+ bool result = true;
+#if defined(__arm__)
+ switch (reg) {
+ case UNW_ARM_R0:
+ *value = context_->uc_mcontext.arm_r0;
+ break;
+ case UNW_ARM_R1:
+ *value = context_->uc_mcontext.arm_r1;
+ break;
+ case UNW_ARM_R2:
+ *value = context_->uc_mcontext.arm_r2;
+ break;
+ case UNW_ARM_R3:
+ *value = context_->uc_mcontext.arm_r3;
+ break;
+ case UNW_ARM_R4:
+ *value = context_->uc_mcontext.arm_r4;
+ break;
+ case UNW_ARM_R5:
+ *value = context_->uc_mcontext.arm_r5;
+ break;
+ case UNW_ARM_R6:
+ *value = context_->uc_mcontext.arm_r6;
+ break;
+ case UNW_ARM_R7:
+ *value = context_->uc_mcontext.arm_r7;
+ break;
+ case UNW_ARM_R8:
+ *value = context_->uc_mcontext.arm_r8;
+ break;
+ case UNW_ARM_R9:
+ *value = context_->uc_mcontext.arm_r9;
+ break;
+ case UNW_ARM_R10:
+ *value = context_->uc_mcontext.arm_r10;
+ break;
+ case UNW_ARM_R11:
+ *value = context_->uc_mcontext.arm_fp;
+ break;
+ case UNW_ARM_R12:
+ *value = context_->uc_mcontext.arm_ip;
+ break;
+ case UNW_ARM_R13:
+ *value = context_->uc_mcontext.arm_sp;
+ break;
+ case UNW_ARM_R14:
+ *value = context_->uc_mcontext.arm_lr;
+ break;
+ case UNW_ARM_R15:
+ *value = context_->uc_mcontext.arm_pc;
+ break;
+ default:
+ result = false;
+ }
+#elif defined(__aarch64__)
+ if (reg <= UNW_AARCH64_PC) {
+ *value = context_->uc_mcontext.regs[reg];
+ } else {
+ result = false;
+ }
+#elif defined(__x86_64__)
+ switch (reg) {
+ case UNW_X86_64_R8:
+ *value = context_->uc_mcontext.gregs[REG_R8];
+ break;
+ case UNW_X86_64_R9:
+ *value = context_->uc_mcontext.gregs[REG_R9];
+ break;
+ case UNW_X86_64_R10:
+ *value = context_->uc_mcontext.gregs[REG_R10];
+ break;
+ case UNW_X86_64_R11:
+ *value = context_->uc_mcontext.gregs[REG_R11];
+ break;
+ case UNW_X86_64_R12:
+ *value = context_->uc_mcontext.gregs[REG_R12];
+ break;
+ case UNW_X86_64_R13:
+ *value = context_->uc_mcontext.gregs[REG_R13];
+ break;
+ case UNW_X86_64_R14:
+ *value = context_->uc_mcontext.gregs[REG_R14];
+ break;
+ case UNW_X86_64_R15:
+ *value = context_->uc_mcontext.gregs[REG_R15];
+ break;
+ case UNW_X86_64_RDI:
+ *value = context_->uc_mcontext.gregs[REG_RDI];
+ break;
+ case UNW_X86_64_RSI:
+ *value = context_->uc_mcontext.gregs[REG_RSI];
+ break;
+ case UNW_X86_64_RBP:
+ *value = context_->uc_mcontext.gregs[REG_RBP];
+ break;
+ case UNW_X86_64_RBX:
+ *value = context_->uc_mcontext.gregs[REG_RBX];
+ break;
+ case UNW_X86_64_RDX:
+ *value = context_->uc_mcontext.gregs[REG_RDX];
+ break;
+ case UNW_X86_64_RAX:
+ *value = context_->uc_mcontext.gregs[REG_RAX];
+ break;
+ case UNW_X86_64_RCX:
+ *value = context_->uc_mcontext.gregs[REG_RCX];
+ break;
+ case UNW_X86_64_RSP:
+ *value = context_->uc_mcontext.gregs[REG_RSP];
+ break;
+ case UNW_X86_64_RIP:
+ *value = context_->uc_mcontext.gregs[REG_RIP];
+ break;
+ default:
+ result = false;
+ }
+#elif defined(__i386__)
+ switch (reg) {
+ case UNW_X86_GS:
+ *value = context_->uc_mcontext.gregs[REG_GS];
+ break;
+ case UNW_X86_FS:
+ *value = context_->uc_mcontext.gregs[REG_FS];
+ break;
+ case UNW_X86_ES:
+ *value = context_->uc_mcontext.gregs[REG_ES];
+ break;
+ case UNW_X86_DS:
+ *value = context_->uc_mcontext.gregs[REG_DS];
+ break;
+ case UNW_X86_EAX:
+ *value = context_->uc_mcontext.gregs[REG_EAX];
+ break;
+ case UNW_X86_EBX:
+ *value = context_->uc_mcontext.gregs[REG_EBX];
+ break;
+ case UNW_X86_ECX:
+ *value = context_->uc_mcontext.gregs[REG_ECX];
+ break;
+ case UNW_X86_EDX:
+ *value = context_->uc_mcontext.gregs[REG_EDX];
+ break;
+ case UNW_X86_ESI:
+ *value = context_->uc_mcontext.gregs[REG_ESI];
+ break;
+ case UNW_X86_EDI:
+ *value = context_->uc_mcontext.gregs[REG_EDI];
+ break;
+ case UNW_X86_EBP:
+ *value = context_->uc_mcontext.gregs[REG_EBP];
+ break;
+ case UNW_X86_EIP:
+ *value = context_->uc_mcontext.gregs[REG_EIP];
+ break;
+ case UNW_X86_ESP:
+ *value = context_->uc_mcontext.gregs[REG_ESP];
+ break;
+ case UNW_X86_TRAPNO:
+ *value = context_->uc_mcontext.gregs[REG_TRAPNO];
+ break;
+ case UNW_X86_CS:
+ *value = context_->uc_mcontext.gregs[REG_CS];
+ break;
+ case UNW_X86_EFLAGS:
+ *value = context_->uc_mcontext.gregs[REG_EFL];
+ break;
+ case UNW_X86_SS:
+ *value = context_->uc_mcontext.gregs[REG_SS];
+ break;
+ default:
+ result = false;
+ }
+#endif
+ return result;
+}
+
+std::string BacktraceOffline::GetFunctionNameRaw(uintptr_t, uintptr_t* offset) {
+ // We don't have enough information to support this. And it is expensive.
+ *offset = 0;
+ return "";
+}
+
+std::unordered_map<std::string, std::unique_ptr<DebugFrameInfo>> BacktraceOffline::debug_frames_;
+std::unordered_set<std::string> BacktraceOffline::debug_frame_missing_files_;
+
+static DebugFrameInfo* ReadDebugFrameFromFile(const std::string& filename);
+
+DebugFrameInfo* BacktraceOffline::GetDebugFrameInFile(const std::string& filename) {
+ if (cache_file_) {
+ auto it = debug_frames_.find(filename);
+ if (it != debug_frames_.end()) {
+ return it->second.get();
+ }
+ if (debug_frame_missing_files_.find(filename) != debug_frame_missing_files_.end()) {
+ return nullptr;
+ }
+ }
+ DebugFrameInfo* debug_frame = ReadDebugFrameFromFile(filename);
+ if (cache_file_) {
+ if (debug_frame != nullptr) {
+ debug_frames_.emplace(filename, std::unique_ptr<DebugFrameInfo>(debug_frame));
+ } else {
+ debug_frame_missing_files_.insert(filename);
+ }
+ } else {
+ if (last_debug_frame_ != nullptr) {
+ delete last_debug_frame_;
+ }
+ last_debug_frame_ = debug_frame;
+ }
+ return debug_frame;
+}
+
+static bool OmitEncodedValue(uint8_t encode, const uint8_t*& p) {
+ if (encode == DW_EH_PE_omit) {
+ return 0;
+ }
+ uint8_t format = encode & 0x0f;
+ switch (format) {
+ case DW_EH_PE_ptr:
+ p += sizeof(unw_word_t);
+ break;
+ case DW_EH_PE_uleb128:
+ case DW_EH_PE_sleb128:
+ while ((*p & 0x80) != 0) {
+ ++p;
+ }
+ ++p;
+ break;
+ case DW_EH_PE_udata2:
+ case DW_EH_PE_sdata2:
+ p += 2;
+ break;
+ case DW_EH_PE_udata4:
+ case DW_EH_PE_sdata4:
+ p += 4;
+ break;
+ case DW_EH_PE_udata8:
+ case DW_EH_PE_sdata8:
+ p += 8;
+ break;
+ default:
+ return false;
+ }
+ return true;
+}
+
+static bool GetFdeTableOffsetInEhFrameHdr(const std::vector<uint8_t>& data,
+ uint64_t* table_offset_in_eh_frame_hdr) {
+ const uint8_t* p = data.data();
+ const uint8_t* end = p + data.size();
+ if (p + 4 > end) {
+ return false;
+ }
+ uint8_t version = *p++;
+ if (version != 1) {
+ return false;
+ }
+ uint8_t eh_frame_ptr_encode = *p++;
+ uint8_t fde_count_encode = *p++;
+ uint8_t fde_table_encode = *p++;
+
+ if (fde_table_encode != (DW_EH_PE_datarel | DW_EH_PE_sdata4)) {
+ return false;
+ }
+
+ if (!OmitEncodedValue(eh_frame_ptr_encode, p) || !OmitEncodedValue(fde_count_encode, p)) {
+ return false;
+ }
+ if (p >= end) {
+ return false;
+ }
+ *table_offset_in_eh_frame_hdr = p - data.data();
+ return true;
+}
+
+using ProgramHeader = DebugFrameInfo::EhFrame::ProgramHeader;
+
+template <class ELFT>
+DebugFrameInfo* ReadDebugFrameFromELFFile(const llvm::object::ELFFile<ELFT>* elf) {
+ bool has_eh_frame_hdr = false;
+ uint64_t eh_frame_hdr_vaddr = 0;
+ std::vector<uint8_t> eh_frame_hdr_data;
+ bool has_eh_frame = false;
+ uint64_t eh_frame_vaddr = 0;
+ std::vector<uint8_t> eh_frame_data;
+
+ for (auto it = elf->begin_sections(); it != elf->end_sections(); ++it) {
+ llvm::ErrorOr<llvm::StringRef> name = elf->getSectionName(&*it);
+ if (name) {
+ if (name.get() == ".debug_frame") {
+ DebugFrameInfo* debug_frame = new DebugFrameInfo;
+ debug_frame->is_eh_frame = false;
+ return debug_frame;
+ }
+ if (name.get() == ".eh_frame_hdr") {
+ has_eh_frame_hdr = true;
+ eh_frame_hdr_vaddr = it->sh_addr;
+ llvm::ErrorOr<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
+ if (data) {
+ eh_frame_hdr_data.insert(eh_frame_hdr_data.begin(), data->data(),
+ data->data() + data->size());
+ } else {
+ return nullptr;
+ }
+ } else if (name.get() == ".eh_frame") {
+ has_eh_frame = true;
+ eh_frame_vaddr = it->sh_addr;
+ llvm::ErrorOr<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
+ if (data) {
+ eh_frame_data.insert(eh_frame_data.begin(), data->data(), data->data() + data->size());
+ } else {
+ return nullptr;
+ }
+ }
+ }
+ }
+ if (!(has_eh_frame_hdr && has_eh_frame)) {
+ return nullptr;
+ }
+ uint64_t fde_table_offset;
+ if (!GetFdeTableOffsetInEhFrameHdr(eh_frame_hdr_data, &fde_table_offset)) {
+ return nullptr;
+ }
+
+ std::vector<ProgramHeader> program_headers;
+ for (auto it = elf->begin_program_headers(); it != elf->end_program_headers(); ++it) {
+ ProgramHeader header;
+ header.vaddr = it->p_vaddr;
+ header.file_offset = it->p_offset;
+ header.file_size = it->p_filesz;
+ program_headers.push_back(header);
+ }
+ DebugFrameInfo* debug_frame = new DebugFrameInfo;
+ debug_frame->is_eh_frame = true;
+ debug_frame->eh_frame.eh_frame_hdr_vaddr = eh_frame_hdr_vaddr;
+ debug_frame->eh_frame.eh_frame_vaddr = eh_frame_vaddr;
+ debug_frame->eh_frame.fde_table_offset_in_eh_frame_hdr = fde_table_offset;
+ debug_frame->eh_frame.eh_frame_hdr_data = std::move(eh_frame_hdr_data);
+ debug_frame->eh_frame.eh_frame_data = std::move(eh_frame_data);
+ debug_frame->eh_frame.program_headers = program_headers;
+ return debug_frame;
+}
+
+static DebugFrameInfo* ReadDebugFrameFromFile(const std::string& filename) {
+ auto owning_binary = llvm::object::createBinary(llvm::StringRef(filename));
+ if (owning_binary.getError()) {
+ return nullptr;
+ }
+ llvm::object::Binary* binary = owning_binary.get().getBinary();
+ auto obj = llvm::dyn_cast<llvm::object::ObjectFile>(binary);
+ if (obj == nullptr) {
+ return nullptr;
+ }
+ if (auto elf = llvm::dyn_cast<llvm::object::ELF32LEObjectFile>(obj)) {
+ return ReadDebugFrameFromELFFile(elf->getELFFile());
+ }
+ if (auto elf = llvm::dyn_cast<llvm::object::ELF64LEObjectFile>(obj)) {
+ return ReadDebugFrameFromELFFile(elf->getELFFile());
+ }
+ return nullptr;
+}