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Force libunwind usage (removes gcc_eh support)

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libunwind is reentrant and signal safe, and works faster then then
gcc_eh (plus it has some custom patches for problems that have been
found during it's usage in ClickHouse).

gcc_eh may be missing in the system (if gcc was not installed), and
even if it exists clickhouse uses -nodefaultlibs, so some care should be
made to make it work.

Also this library is tiny and there shouln't be any problem to require
it always (there is already tendency to require some contrib libraries,
i.e. poco).

Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
This commit is contained in:
Azat Khuzhin 2023-05-03 10:09:11 +02:00
parent a2d7f5e635
commit a10aa9ad50
15 changed files with 21 additions and 55 deletions
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1
CMakeLists.txt
View File

@ -87,7 +87,6 @@ if (ENABLE_FUZZING)
set (ENABLE_CLICKHOUSE_ODBC_BRIDGE OFF)
set (ENABLE_LIBRARIES 0)
set (ENABLE_SSL 1)
set (USE_UNWIND ON)
set (ENABLE_EMBEDDED_COMPILER 0)
set (ENABLE_EXAMPLES 0)
set (ENABLE_UTILS 0)

1
cmake/darwin/default_libs.cmake
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@ -15,6 +15,7 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15)
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
include (cmake/unwind.cmake)
include (cmake/cxx.cmake)
link_libraries(global-group)

1
cmake/target.cmake
View File

@ -40,7 +40,6 @@ if (CMAKE_CROSSCOMPILING)
set (OPENSSL_NO_ASM ON CACHE INTERNAL "")
set (ENABLE_JEMALLOC ON CACHE INTERNAL "")
set (ENABLE_PARQUET OFF CACHE INTERNAL "")
set (USE_UNWIND OFF CACHE INTERNAL "")
set (ENABLE_GRPC OFF CACHE INTERNAL "")
set (ENABLE_HDFS OFF CACHE INTERNAL "")
set (ENABLE_MYSQL OFF CACHE INTERNAL "")

14
cmake/unwind.cmake
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@ -1,13 +1 @@
option (USE_UNWIND "Enable libunwind (better stacktraces)" ${ENABLE_LIBRARIES})
if (USE_UNWIND)
add_subdirectory(contrib/libunwind-cmake)
set (UNWIND_LIBRARIES unwind)
set (EXCEPTION_HANDLING_LIBRARY ${UNWIND_LIBRARIES})
message (STATUS "Using libunwind: ${UNWIND_LIBRARIES}")
else ()
set (EXCEPTION_HANDLING_LIBRARY gcc_eh)
endif ()
message (STATUS "Using exception handler: ${EXCEPTION_HANDLING_LIBRARY}")
add_subdirectory(contrib/libunwind-cmake)

17
contrib/jemalloc-cmake/CMakeLists.txt
View File

@ -170,16 +170,13 @@ endif ()
target_compile_definitions(_jemalloc PRIVATE -DJEMALLOC_PROF=1)
if (USE_UNWIND)
# jemalloc provides support for two different libunwind flavors: the original HP libunwind and the one coming with gcc / g++ / libstdc++.
# The latter is identified by `JEMALLOC_PROF_LIBGCC` and uses `_Unwind_Backtrace` method instead of `unw_backtrace`.
# At the time ClickHouse uses LLVM libunwind which follows libgcc's way of backtracing.
# ClickHouse has to provide `unw_backtrace` method by the means of [commit 8e2b31e](https://github.com/ClickHouse/libunwind/commit/8e2b31e766dd502f6df74909e04a7dbdf5182eb1).
target_compile_definitions (_jemalloc PRIVATE -DJEMALLOC_PROF_LIBGCC=1)
target_link_libraries (_jemalloc PRIVATE unwind)
endif ()
# jemalloc provides support for two different libunwind flavors: the original HP libunwind and the one coming with gcc / g++ / libstdc++.
# The latter is identified by `JEMALLOC_PROF_LIBGCC` and uses `_Unwind_Backtrace` method instead of `unw_backtrace`.
# At the time ClickHouse uses LLVM libunwind which follows libgcc's way of backtracing.
#
# ClickHouse has to provide `unw_backtrace` method by the means of [commit 8e2b31e](https://github.com/ClickHouse/libunwind/commit/8e2b31e766dd502f6df74909e04a7dbdf5182eb1).
target_compile_definitions (_jemalloc PRIVATE -DJEMALLOC_PROF_LIBGCC=1)
target_link_libraries (_jemalloc PRIVATE unwind)
# for RTLD_NEXT
target_compile_options(_jemalloc PRIVATE -D_GNU_SOURCE)

4
contrib/libcxx-cmake/CMakeLists.txt
View File

@ -61,9 +61,7 @@ target_include_directories(cxx SYSTEM BEFORE PUBLIC $<$<COMPILE_LANGUAGE:CXX>:$
target_compile_definitions(cxx PRIVATE -D_LIBCPP_BUILDING_LIBRARY -DLIBCXX_BUILDING_LIBCXXABI)
# Enable capturing stack traces for all exceptions.
if (USE_UNWIND)
target_compile_definitions(cxx PUBLIC -DSTD_EXCEPTION_HAS_STACK_TRACE=1)
endif ()
target_compile_definitions(cxx PUBLIC -DSTD_EXCEPTION_HAS_STACK_TRACE=1)
if (USE_MUSL)
target_compile_definitions(cxx PUBLIC -D_LIBCPP_HAS_MUSL_LIBC=1)

6
contrib/libcxxabi-cmake/CMakeLists.txt
View File

@ -35,12 +35,10 @@ target_include_directories(cxxabi SYSTEM BEFORE
)
target_compile_definitions(cxxabi PRIVATE -D_LIBCPP_BUILDING_LIBRARY)
target_compile_options(cxxabi PRIVATE -nostdinc++ -fno-sanitize=undefined -Wno-macro-redefined) # If we don't disable UBSan, infinite recursion happens in dynamic_cast.
target_link_libraries(cxxabi PUBLIC ${EXCEPTION_HANDLING_LIBRARY})
target_link_libraries(cxxabi PUBLIC unwind)
# Enable capturing stack traces for all exceptions.
if (USE_UNWIND)
target_compile_definitions(cxxabi PUBLIC -DSTD_EXCEPTION_HAS_STACK_TRACE=1)
endif ()
target_compile_definitions(cxxabi PUBLIC -DSTD_EXCEPTION_HAS_STACK_TRACE=1)
install(
TARGETS cxxabi

1
docker/test/fasttest/run.sh
View File

@ -166,7 +166,6 @@ function run_cmake
"-DENABLE_UTILS=0"
"-DENABLE_EMBEDDED_COMPILER=0"
"-DENABLE_THINLTO=0"
"-DUSE_UNWIND=1"
"-DENABLE_NURAFT=1"
"-DENABLE_SIMDJSON=1"
"-DENABLE_JEMALLOC=1"

2
docs/en/development/build-cross-riscv.md
View File

@ -23,7 +23,7 @@ sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
``` bash
cd ClickHouse
mkdir build-riscv64
CC=clang-16 CXX=clang++-16 cmake . -Bbuild-riscv64 -G Ninja -DCMAKE_TOOLCHAIN_FILE=cmake/linux/toolchain-riscv64.cmake -DGLIBC_COMPATIBILITY=OFF -DENABLE_LDAP=OFF -DOPENSSL_NO_ASM=ON -DENABLE_JEMALLOC=ON -DENABLE_PARQUET=OFF -DUSE_UNWIND=OFF -DENABLE_GRPC=OFF -DENABLE_HDFS=OFF -DENABLE_MYSQL=OFF
CC=clang-16 CXX=clang++-16 cmake . -Bbuild-riscv64 -G Ninja -DCMAKE_TOOLCHAIN_FILE=cmake/linux/toolchain-riscv64.cmake -DGLIBC_COMPATIBILITY=OFF -DENABLE_LDAP=OFF -DOPENSSL_NO_ASM=ON -DENABLE_JEMALLOC=ON -DENABLE_PARQUET=OFF -DENABLE_GRPC=OFF -DENABLE_HDFS=OFF -DENABLE_MYSQL=OFF
ninja -C build-riscv64
```

6
programs/server/Server.cpp
View File

@ -1627,7 +1627,7 @@ try
/// Init trace collector only after trace_log system table was created
/// Disable it if we collect test coverage information, because it will work extremely slow.
#if USE_UNWIND && !WITH_COVERAGE
#if !WITH_COVERAGE
/// Profilers cannot work reliably with any other libunwind or without PHDR cache.
if (hasPHDRCache())
{
@ -1650,10 +1650,6 @@ try
/// Describe multiple reasons when query profiler cannot work.
#if !USE_UNWIND
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they cannot work without bundled unwind (stack unwinding) library.");
#endif
#if WITH_COVERAGE
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they work extremely slow with test coverage.");
#endif

8
src/Common/QueryProfiler.cpp
View File

@ -91,7 +91,7 @@ namespace ErrorCodes
extern const int NOT_IMPLEMENTED;
}
#if USE_UNWIND
#ifndef __APPLE__
Timer::Timer()
: log(&Poco::Logger::get("Timer"))
{}
@ -209,13 +209,13 @@ QueryProfilerBase<ProfilerImpl>::QueryProfilerBase(UInt64 thread_id, int clock_t
UNUSED(pause_signal);
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "QueryProfiler disabled because they cannot work under sanitizers");
#elif !USE_UNWIND
#elif defined(__APPLE__)
UNUSED(thread_id);
UNUSED(clock_type);
UNUSED(period);
UNUSED(pause_signal);
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "QueryProfiler cannot work with stock libunwind");
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "QueryProfiler cannot work on OSX");
#else
/// Sanity check.
if (!hasPHDRCache())
@ -264,7 +264,7 @@ QueryProfilerBase<ProfilerImpl>::~QueryProfilerBase()
template <typename ProfilerImpl>
void QueryProfilerBase<ProfilerImpl>::cleanup()
{
#if USE_UNWIND
#ifndef __APPLE__
timer.stop();
signal_handler_disarmed = true;
#endif

4
src/Common/QueryProfiler.h
View File

@ -28,7 +28,7 @@ namespace DB
* Note that signal handler implementation is defined by template parameter. See QueryProfilerReal and QueryProfilerCPU.
*/
#if USE_UNWIND
#ifndef __APPLE__
class Timer
{
public:
@ -60,7 +60,7 @@ private:
Poco::Logger * log;
#if USE_UNWIND
#ifndef __APPLE__
inline static thread_local Timer timer = Timer();
#endif

9
src/Common/StackTrace.cpp
View File

@ -20,13 +20,10 @@
#include <sstream>
#include <unordered_map>
#include <fmt/format.h>
#include <libunwind.h>
#include "config.h"
#if USE_UNWIND
# include <libunwind.h>
#endif
namespace
{
/// Currently this variable is set up once on server startup.
@ -287,12 +284,8 @@ StackTrace::StackTrace(const ucontext_t & signal_context)
void StackTrace::tryCapture()
{
#if USE_UNWIND
size = unw_backtrace(frame_pointers.data(), capacity);
__msan_unpoison(frame_pointers.data(), size * sizeof(frame_pointers[0]));
#else
size = 0;
#endif
}
/// ClickHouse uses bundled libc++ so type names will be the same on every system thus it's safe to hardcode them

1
src/Common/config.h.in
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@ -9,7 +9,6 @@
#cmakedefine01 USE_AWS_S3
#cmakedefine01 USE_AZURE_BLOB_STORAGE
#cmakedefine01 USE_BROTLI
#cmakedefine01 USE_UNWIND
#cmakedefine01 USE_CASSANDRA
#cmakedefine01 USE_SENTRY
#cmakedefine01 USE_GRPC

1
src/Storages/System/StorageSystemBuildOptions.cpp.in
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@ -23,7 +23,6 @@ const char * auto_config_build[]
"USE_EMBEDDED_COMPILER", "@USE_EMBEDDED_COMPILER@",
"USE_GLIBC_COMPATIBILITY", "@GLIBC_COMPATIBILITY@",
"USE_JEMALLOC", "@ENABLE_JEMALLOC@",
"USE_UNWIND", "@USE_UNWIND@",
"USE_ICU", "@USE_ICU@",
"USE_H3", "@USE_H3@",
"USE_MYSQL", "@USE_MYSQL@",