Merge "Revert "Revert "Revert "Add BacktraceOffline for offline backtracing.""""
diff --git a/debuggerd/Android.mk b/debuggerd/Android.mk
index de0f943..f7a5f82 100644
--- a/debuggerd/Android.mk
+++ b/debuggerd/Android.mk
@@ -99,7 +99,6 @@
debuggerd_cpp_flags := \
$(common_cppflags) \
-Wno-missing-field-initializers \
- -fno-rtti \
# Only build the host tests on linux.
ifeq ($(HOST_OS),linux)
diff --git a/include/backtrace/Backtrace.h b/include/backtrace/Backtrace.h
index f440bd2..290682a 100644
--- a/include/backtrace/Backtrace.h
+++ b/include/backtrace/Backtrace.h
@@ -52,12 +52,6 @@
typedef ucontext ucontext_t;
#endif
-struct backtrace_stackinfo_t {
- uint64_t start;
- uint64_t end;
- const uint8_t* data;
-};
-
class Backtrace {
public:
// Create the correct Backtrace object based on what is to be unwound.
@@ -72,14 +66,6 @@
// If map is not NULL, the map is still owned by the caller.
static Backtrace* Create(pid_t pid, pid_t tid, BacktraceMap* map = NULL);
- // Create an offline Backtrace object that can be used to do an unwind without a process
- // that is still running. If cache_file is set to true, then elf information will be cached
- // for this call. The cached information survives until the calling process ends. This means
- // that subsequent calls to create offline Backtrace objects will continue to use the same
- // cache. It also assumes that the elf files used for each offline unwind are the same.
- static Backtrace* CreateOffline(pid_t pid, pid_t tid, BacktraceMap* map,
- const backtrace_stackinfo_t& stack, bool cache_file = false);
-
virtual ~Backtrace();
// Get the current stack trace and store in the backtrace_ structure.
diff --git a/include/backtrace/BacktraceMap.h b/include/backtrace/BacktraceMap.h
index 2373c45..bb18aa2 100644
--- a/include/backtrace/BacktraceMap.h
+++ b/include/backtrace/BacktraceMap.h
@@ -31,7 +31,6 @@
#include <deque>
#include <string>
-#include <vector>
struct backtrace_map_t {
uintptr_t start = 0;
@@ -49,8 +48,6 @@
// is unsupported.
static BacktraceMap* Create(pid_t pid, bool uncached = false);
- static BacktraceMap* Create(pid_t pid, const std::vector<backtrace_map_t>& maps);
-
virtual ~BacktraceMap();
// Fill in the map data structure for the given address.
diff --git a/libbacktrace/Android.build.mk b/libbacktrace/Android.build.mk
index 8e63dab..4983b55 100644
--- a/libbacktrace/Android.build.mk
+++ b/libbacktrace/Android.build.mk
@@ -69,10 +69,7 @@
$($(module)_ldlibs) \
$($(module)_ldlibs_$(build_type)) \
-LOCAL_STRIP_MODULE := $($(module)_strip_module)
-
ifeq ($(build_type),target)
- include $(LLVM_DEVICE_BUILD_MK)
include $(BUILD_$(build_target))
endif
@@ -80,7 +77,6 @@
# Only build if host builds are supported.
ifeq ($(build_host),true)
LOCAL_CFLAGS += -Wno-extern-c-compat -fno-omit-frame-pointer
- include $(LLVM_HOST_BUILD_MK)
include $(BUILD_HOST_$(build_target))
endif
endif
diff --git a/libbacktrace/Android.mk b/libbacktrace/Android.mk
index 9c6742e..395d677 100644
--- a/libbacktrace/Android.mk
+++ b/libbacktrace/Android.mk
@@ -25,7 +25,6 @@
libbacktrace_common_cppflags := \
-std=gnu++11 \
- -I external/libunwind/include/tdep \
# The latest clang (r230699) does not allow SP/PC to be declared in inline asm lists.
libbacktrace_common_clang_cflags += \
@@ -38,9 +37,6 @@
endif
endif
-LLVM_ROOT_PATH := external/llvm
-include $(LLVM_ROOT_PATH)/llvm.mk
-
#-------------------------------------------------------------------------
# The libbacktrace library.
#-------------------------------------------------------------------------
@@ -48,7 +44,6 @@
Backtrace.cpp \
BacktraceCurrent.cpp \
BacktraceMap.cpp \
- BacktraceOffline.cpp \
BacktracePtrace.cpp \
thread_utils.c \
ThreadEntry.cpp \
@@ -61,20 +56,6 @@
liblog \
libunwind \
-# Use shared llvm library on device to save space.
-libbacktrace_shared_libraries_target := \
- libLLVM \
-
-# Use static llvm libraries on host to remove dependency on 32-bit llvm shared library
-# which is not included in the prebuilt.
-libbacktrace_static_libraries_host := \
- libLLVMObject \
- libLLVMBitReader \
- libLLVMMC \
- libLLVMMCParser \
- libLLVMCore \
- libLLVMSupport \
-
libbacktrace_ldlibs_host := \
-lpthread \
-lrt \
@@ -105,8 +86,6 @@
libbacktrace_test_src_files := \
backtrace_testlib.c \
-libbacktrace_test_strip_module := false
-
module := libbacktrace_test
module_tag := debug
build_type := target
@@ -128,7 +107,6 @@
-DENABLE_PSS_TESTS \
backtrace_test_src_files := \
- backtrace_offline_test.cpp \
backtrace_test.cpp \
GetPss.cpp \
thread_utils.c \
@@ -142,7 +120,6 @@
libbacktrace \
libbase \
libcutils \
- libunwind \
backtrace_test_shared_libraries_target += \
libdl \
@@ -150,8 +127,6 @@
backtrace_test_ldlibs_host += \
-ldl \
-backtrace_test_strip_module := false
-
module := backtrace_test
module_tag := debug
build_type := target
diff --git a/libbacktrace/Backtrace.cpp b/libbacktrace/Backtrace.cpp
index 9ead452..97f0ef4 100644
--- a/libbacktrace/Backtrace.cpp
+++ b/libbacktrace/Backtrace.cpp
@@ -30,7 +30,6 @@
#include <cutils/threads.h>
#include "BacktraceLog.h"
-#include "BacktraceOffline.h"
#include "thread_utils.h"
#include "UnwindCurrent.h"
#include "UnwindPtrace.h"
@@ -141,8 +140,3 @@
return new UnwindPtrace(pid, tid, map);
}
}
-
-Backtrace* Backtrace::CreateOffline(pid_t pid, pid_t tid, BacktraceMap* map,
- const backtrace_stackinfo_t& stack, bool cache_file) {
- return new BacktraceOffline(pid, tid, map, stack, cache_file);
-}
diff --git a/libbacktrace/BacktraceMap.cpp b/libbacktrace/BacktraceMap.cpp
index eac20fe..ca47f67 100644
--- a/libbacktrace/BacktraceMap.cpp
+++ b/libbacktrace/BacktraceMap.cpp
@@ -144,13 +144,3 @@
return map;
}
#endif
-
-BacktraceMap* BacktraceMap::Create(pid_t pid, const std::vector<backtrace_map_t>& maps) {
- BacktraceMap* backtrace_map = new BacktraceMap(pid);
- backtrace_map->maps_.insert(backtrace_map->maps_.begin(), maps.begin(), maps.end());
- std::sort(backtrace_map->maps_.begin(), backtrace_map->maps_.end(),
- [](const backtrace_map_t& map1, const backtrace_map_t& map2) {
- return map1.start < map2.start;
- });
- return backtrace_map;
-}
diff --git a/libbacktrace/BacktraceOffline.cpp b/libbacktrace/BacktraceOffline.cpp
deleted file mode 100644
index 27dfb83..0000000
--- a/libbacktrace/BacktraceOffline.cpp
+++ /dev/null
@@ -1,636 +0,0 @@
-/*
- * 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;
-}
diff --git a/libbacktrace/BacktraceOffline.h b/libbacktrace/BacktraceOffline.h
deleted file mode 100644
index 42f826d..0000000
--- a/libbacktrace/BacktraceOffline.h
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef _LIBBACKTRACE_UNWIND_OFFLINE_H
-#define _LIBBACKTRACE_UNWIND_OFFLINE_H
-
-#include <libunwind.h>
-#include <stdint.h>
-#include <sys/types.h>
-#include <ucontext.h>
-
-#include <unordered_map>
-#include <unordered_set>
-
-#include <backtrace/Backtrace.h>
-
-struct Space {
- uint64_t start;
- uint64_t end;
- const uint8_t* data;
-
- Space() {
- Clear();
- }
-
- void Clear();
- size_t Read(uint64_t addr, uint8_t* buffer, size_t size);
-};
-
-struct DebugFrameInfo {
- bool is_eh_frame;
- struct EhFrame {
- uint64_t eh_frame_hdr_vaddr;
- uint64_t eh_frame_vaddr;
- uint64_t fde_table_offset_in_eh_frame_hdr;
- std::vector<uint8_t> eh_frame_hdr_data;
- std::vector<uint8_t> eh_frame_data;
- struct ProgramHeader {
- uint64_t vaddr;
- uint64_t file_offset;
- uint64_t file_size;
- };
- std::vector<ProgramHeader> program_headers;
- } eh_frame;
-};
-
-class BacktraceOffline : public Backtrace {
- public:
- BacktraceOffline(pid_t pid, pid_t tid, BacktraceMap* map, const backtrace_stackinfo_t& stack,
- bool cache_file)
- : Backtrace(pid, tid, map),
- cache_file_(cache_file),
- context_(nullptr),
- last_debug_frame_(nullptr) {
- stack_space_.start = stack.start;
- stack_space_.end = stack.end;
- stack_space_.data = stack.data;
- }
-
- virtual ~BacktraceOffline() {
- if (last_debug_frame_ != nullptr) {
- delete last_debug_frame_;
- }
- }
-
- bool Unwind(size_t num_ignore_frames, ucontext_t* context) override;
-
- bool ReadWord(uintptr_t ptr, word_t* out_value) override;
-
- size_t Read(uintptr_t addr, uint8_t* buffer, size_t bytes) override;
-
- bool FindProcInfo(unw_addr_space_t addr_space, uint64_t ip, unw_proc_info_t* proc_info,
- int need_unwind_info);
-
- bool ReadReg(size_t reg_index, uint64_t* value);
-
- protected:
- std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override;
- DebugFrameInfo* GetDebugFrameInFile(const std::string& filename);
-
- static std::unordered_map<std::string, std::unique_ptr<DebugFrameInfo>> debug_frames_;
- static std::unordered_set<std::string> debug_frame_missing_files_;
-
- bool cache_file_;
- ucontext_t* context_;
- Space eh_frame_hdr_space_;
- Space eh_frame_space_;
- Space stack_space_;
- DebugFrameInfo* last_debug_frame_;
-};
-
-#endif // _LIBBACKTRACE_BACKTRACE_OFFLINE_H
diff --git a/libbacktrace/backtrace_offline_test.cpp b/libbacktrace/backtrace_offline_test.cpp
deleted file mode 100644
index 88a3533..0000000
--- a/libbacktrace/backtrace_offline_test.cpp
+++ /dev/null
@@ -1,189 +0,0 @@
-#include <libunwind.h>
-#include <pthread.h>
-#include <stdint.h>
-#include <string.h>
-
-#include <functional>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include <backtrace/Backtrace.h>
-#include <backtrace/BacktraceMap.h>
-#include <cutils/threads.h>
-
-#include <gtest/gtest.h>
-
-extern "C" {
-// Prototypes for functions in the test library.
-int test_level_one(int, int, int, int, void (*)(void*), void*);
-int test_level_two(int, int, int, int, void (*)(void*), void*);
-int test_level_three(int, int, int, int, void (*)(void*), void*);
-int test_level_four(int, int, int, int, void (*)(void*), void*);
-int test_recursive_call(int, void (*)(void*), void*);
-}
-
-static volatile bool g_exit_flag = false;
-
-static void GetContextAndExit(void* arg) {
- unw_context_t* unw_context = reinterpret_cast<unw_context_t*>(arg);
- unw_getcontext(unw_context);
- // Don't touch the stack anymore.
- while (!g_exit_flag) {
- }
-}
-
-struct OfflineThreadArg {
- unw_context_t unw_context;
- pid_t tid;
- std::function<int(void (*)(void*), void*)> function;
-};
-
-static void* OfflineThreadFunc(void* arg) {
- OfflineThreadArg* fn_arg = reinterpret_cast<OfflineThreadArg*>(arg);
- fn_arg->tid = gettid();
- fn_arg->function(GetContextAndExit, &fn_arg->unw_context);
- return nullptr;
-}
-
-static ucontext_t GetUContextFromUnwContext(const unw_context_t& unw_context) {
- ucontext_t ucontext;
- memset(&ucontext, 0, sizeof(ucontext));
-#if defined(__arm__)
- ucontext.uc_mcontext.arm_r0 = unw_context.regs[0];
- ucontext.uc_mcontext.arm_r1 = unw_context.regs[1];
- ucontext.uc_mcontext.arm_r2 = unw_context.regs[2];
- ucontext.uc_mcontext.arm_r3 = unw_context.regs[3];
- ucontext.uc_mcontext.arm_r4 = unw_context.regs[4];
- ucontext.uc_mcontext.arm_r5 = unw_context.regs[5];
- ucontext.uc_mcontext.arm_r6 = unw_context.regs[6];
- ucontext.uc_mcontext.arm_r7 = unw_context.regs[7];
- ucontext.uc_mcontext.arm_r8 = unw_context.regs[8];
- ucontext.uc_mcontext.arm_r9 = unw_context.regs[9];
- ucontext.uc_mcontext.arm_r10 = unw_context.regs[10];
- ucontext.uc_mcontext.arm_fp = unw_context.regs[11];
- ucontext.uc_mcontext.arm_ip = unw_context.regs[12];
- ucontext.uc_mcontext.arm_sp = unw_context.regs[13];
- ucontext.uc_mcontext.arm_lr = unw_context.regs[14];
- ucontext.uc_mcontext.arm_pc = unw_context.regs[15];
-#else
- ucontext.uc_mcontext = unw_context.uc_mcontext;
-#endif
- return ucontext;
-}
-
-static void OfflineBacktraceFunctionCall(std::function<int(void (*)(void*), void*)> function,
- std::vector<uintptr_t>* pc_values) {
- // Create a thread to generate the needed stack and registers information.
- g_exit_flag = false;
- const size_t stack_size = 1024 * 1024;
- void* stack = mmap(NULL, stack_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- ASSERT_NE(MAP_FAILED, stack);
- uintptr_t stack_addr = reinterpret_cast<uintptr_t>(stack);
- pthread_attr_t attr;
- ASSERT_EQ(0, pthread_attr_init(&attr));
- ASSERT_EQ(0, pthread_attr_setstack(&attr, reinterpret_cast<void*>(stack), stack_size));
- pthread_t thread;
- OfflineThreadArg arg;
- arg.function = function;
- ASSERT_EQ(0, pthread_create(&thread, &attr, OfflineThreadFunc, &arg));
- // Wait for the offline thread to generate the stack and unw_context information.
- sleep(1);
- // Copy the stack information.
- std::vector<uint8_t> stack_data(reinterpret_cast<uint8_t*>(stack),
- reinterpret_cast<uint8_t*>(stack) + stack_size);
- g_exit_flag = true;
- ASSERT_EQ(0, pthread_join(thread, nullptr));
- ASSERT_EQ(0, munmap(stack, stack_size));
-
- // Do offline backtrace.
- std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid()));
- ASSERT_TRUE(map != nullptr);
-
- backtrace_stackinfo_t stack_info;
- stack_info.start = stack_addr;
- stack_info.end = stack_addr + stack_size;
- stack_info.data = stack_data.data();
-
- std::unique_ptr<Backtrace> backtrace(
- Backtrace::CreateOffline(getpid(), arg.tid, map.get(), stack_info));
- ASSERT_TRUE(backtrace != nullptr);
-
- ucontext_t ucontext = GetUContextFromUnwContext(arg.unw_context);
- ASSERT_TRUE(backtrace->Unwind(0, &ucontext));
-
- // Collect pc values of the call stack frames.
- for (size_t i = 0; i < backtrace->NumFrames(); ++i) {
- pc_values->push_back(backtrace->GetFrame(i)->pc);
- }
-}
-
-// Return the name of the function which matches the address. Although we don't know the
-// exact end of each function, it is accurate enough for the tests.
-static std::string FunctionNameForAddress(uintptr_t addr) {
- struct FunctionSymbol {
- std::string name;
- uintptr_t start;
- uintptr_t end;
- };
-
- static std::vector<FunctionSymbol> symbols;
- if (symbols.empty()) {
- symbols = std::vector<FunctionSymbol>{
- {"unknown_start", 0, 0},
- {"test_level_one", reinterpret_cast<uintptr_t>(&test_level_one), 0},
- {"test_level_two", reinterpret_cast<uintptr_t>(&test_level_two), 0},
- {"test_level_three", reinterpret_cast<uintptr_t>(&test_level_three), 0},
- {"test_level_four", reinterpret_cast<uintptr_t>(&test_level_four), 0},
- {"test_recursive_call", reinterpret_cast<uintptr_t>(&test_recursive_call), 0},
- {"GetContextAndExit", reinterpret_cast<uintptr_t>(&GetContextAndExit), 0},
- {"unknown_end", static_cast<uintptr_t>(-1), static_cast<uintptr_t>(-1)},
- };
- std::sort(
- symbols.begin(), symbols.end(),
- [](const FunctionSymbol& s1, const FunctionSymbol& s2) { return s1.start < s2.start; });
- for (size_t i = 0; i + 1 < symbols.size(); ++i) {
- symbols[i].end = symbols[i + 1].start;
- }
- }
- for (auto& symbol : symbols) {
- if (addr >= symbol.start && addr < symbol.end) {
- return symbol.name;
- }
- }
- return "";
-}
-
-TEST(libbacktrace, offline) {
- std::function<int(void (*)(void*), void*)> function =
- std::bind(test_level_one, 1, 2, 3, 4, std::placeholders::_1, std::placeholders::_2);
- std::vector<uintptr_t> pc_values;
- OfflineBacktraceFunctionCall(function, &pc_values);
- ASSERT_FALSE(pc_values.empty());
- ASSERT_LE(pc_values.size(), static_cast<size_t>(MAX_BACKTRACE_FRAMES));
-
- size_t test_one_index = 0;
- for (size_t i = 0; i < pc_values.size(); ++i) {
- if (FunctionNameForAddress(pc_values[i]) == "test_level_one") {
- test_one_index = i;
- break;
- }
- }
-
- ASSERT_GE(test_one_index, 3u);
- ASSERT_EQ("test_level_one", FunctionNameForAddress(pc_values[test_one_index]));
- ASSERT_EQ("test_level_two", FunctionNameForAddress(pc_values[test_one_index - 1]));
- ASSERT_EQ("test_level_three", FunctionNameForAddress(pc_values[test_one_index - 2]));
- ASSERT_EQ("test_level_four", FunctionNameForAddress(pc_values[test_one_index - 3]));
-}
-
-TEST(libbacktrace, offline_max_trace) {
- std::function<int(void (*)(void*), void*)> function = std::bind(
- test_recursive_call, MAX_BACKTRACE_FRAMES + 10, std::placeholders::_1, std::placeholders::_2);
- std::vector<uintptr_t> pc_values;
- OfflineBacktraceFunctionCall(function, &pc_values);
- ASSERT_FALSE(pc_values.empty());
- ASSERT_EQ(static_cast<size_t>(MAX_BACKTRACE_FRAMES), pc_values.size());
- ASSERT_EQ("test_recursive_call", FunctionNameForAddress(pc_values.back()));
-}