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Added a way to forbid static initialization of a class

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This commit is contained in:
Alexey Milovidov 2019-08-28 20:13:29 +03:00
parent 30cc569845
commit cf57a88495
2 changed files with 19 additions and 0 deletions
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12
dbms/programs/main.cpp
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@ -21,6 +21,7 @@
#include <Common/StringUtils/StringUtils.h>
#include <common/phdr_cache.h>
#include <ext/scope_guard.h>
/// Universal executable for various clickhouse applications
@ -130,8 +131,19 @@ bool isClickhouseApp(const std::string & app_suffix, std::vector<char *> & argv)
}
/// This allows to implement assert to forbid initialization of a class in static constructors.
/// Usage:
///
/// extern bool inside_main;
/// class C { C() { assert(inside_main); } };
bool inside_main = false;
int main(int argc_, char ** argv_)
{
inside_main = true;
SCOPE_EXIT({ inside_main = false; });
/// Reset new handler to default (that throws std::bad_alloc)
/// It is needed because LLVM library clobbers it.
std::set_new_handler(nullptr);

7
libs/libcommon/src/DateLUTImpl.cpp
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@ -44,9 +44,16 @@ UInt8 getDayOfWeek(const cctz::civil_day & date)
}
__attribute__((__weak__)) extern bool inside_main;
DateLUTImpl::DateLUTImpl(const std::string & time_zone_)
: time_zone(time_zone_)
{
/// DateLUT should not be initialized in global constructors for the following reasons:
/// 1. It is too heavy.
if (&inside_main)
assert(inside_main);
size_t i = 0;
time_t start_of_day = DATE_LUT_MIN;