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Reduce C++ file scope class objects 

Update comments and documentation
pull/548/head
Jeffrey Walton 2017-11-12 11:55:57 -05:00
parent d28e813ac3
commit bf717f47e6
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5 changed files with 138 additions and 106 deletions
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2
config.h
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@ -374,7 +374,7 @@ NAMESPACE_END
// 4786: identifier was truncated in debug information
// 4355: 'this' : used in base member initializer list
// 4910: '__declspec(dllexport)' and 'extern' are incompatible on an explicit instantiation
# pragma warning(disable: 4127 4512 4661)
# pragma warning(disable: 4127 4512 4661 4910)
// Security related, possible defects
// http://blogs.msdn.com/b/vcblog/archive/2010/12/14/off-by-default-compiler-warnings-in-visual-c.aspx
# pragma warning(once: 4191 4242 4263 4264 4266 4302 4826 4905 4906 4928)

28
cpu.cpp
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@ -113,7 +113,6 @@ bool CpuId(word32 func, word32 subfunc, word32 output[4])
mov eax, func
mov ecx, subfunc
cpuid
mov edi, output
mov [a], eax
mov [b], ebx
mov [c], ecx
@ -130,7 +129,9 @@ bool CpuId(word32 func, word32 subfunc, word32 output[4])
return false;
}
// function 0 returns the highest basic function understood in EAX
// func = 0 returns the highest basic function understood in EAX. If the CPU does
// not return non-0, then it is mostly useless. The code below converts basic
// function value to a true/false return value.
if(func == 0)
return !!output[0];
@ -748,9 +749,11 @@ NAMESPACE_END
// *************************** C++ Static Initialization ***************************
ANONYMOUS_NAMESPACE_BEGIN
struct InitializeCpu
class InitCpu
{
InitializeCpu()
public:
InitCpu()
{
#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
CryptoPP::DetectX86Features();
@ -762,16 +765,21 @@ struct InitializeCpu
}
};
// This is not really needed because HasSSE() and friends can dynamically initialize.
// Everything depends on CPU features so we initialize it once at load time.
// Dynamic initialization will be used if init priorities are not available.
#if HAVE_GCC_INIT_PRIORITY
const InitializeCpu s_init __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 20))) = InitializeCpu();
const InitCpu s_init __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 10))) = InitCpu();
#elif HAVE_MSC_INIT_PRIORITY
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU-020")
const InitializeCpu s_init;
#pragma warning(default: 4075)
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU")
const InitCpu s_init;
#pragma warning(default: 4075)
#else
const InitializeCpu& s_init = CryptoPP::Singleton<InitializeCpu>().Ref();
const InitCpu s_init;
#endif
ANONYMOUS_NAMESPACE_END
#endif // CRYPTOPP_IMPORTS

26
cryptlib.cpp
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@ -42,6 +42,7 @@ CRYPTOPP_COMPILE_ASSERT(sizeof(word64) == 8);
CRYPTOPP_COMPILE_ASSERT(sizeof(dword) == 2*sizeof(word));
#endif
#if 0
class NullNameValuePairs : public NameValuePairs
{
public:
@ -49,6 +50,7 @@ public:
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{CRYPTOPP_UNUSED(name); CRYPTOPP_UNUSED(valueType); CRYPTOPP_UNUSED(pValue); return false;}
};
#endif
BufferedTransformation & TheBitBucket()
{
@ -945,27 +947,13 @@ int LibraryVersion(CRYPTOPP_NOINLINE_DOTDOTDOT)
}
// ***************** C++ Static Initialization ********************
// We can't put these in the anonymous namespace. DEFAULT_CHANNEL,
// AAD_CHANNEL and g_nullNameValuePairs must be defined in CryptoPP.
#if HAVE_GCC_INIT_PRIORITY
const std::string DEFAULT_CHANNEL __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 10))) = "";
const std::string AAD_CHANNEL __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 11))) = "AAD";
const NullNameValuePairs s_nullNameValuePairs __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 12)));
const NameValuePairs &g_nullNameValuePairs = dynamic_cast<const NameValuePairs&>(s_nullNameValuePairs);
#elif HAVE_MSC_INIT_PRIORITY
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU-010")
const std::string DEFAULT_CHANNEL("");
#if 0
const std::string DEFAULT_CHANNEL;
const std::string AAD_CHANNEL("AAD");
const NullNameValuePairs s_nullNameValuePairs;
const NameValuePairs &g_nullNameValuePairs = dynamic_cast<const NameValuePairs&>(s_nullNameValuePairs);
#pragma warning(default: 4075)
#else
const std::string DEFAULT_CHANNEL = "";
const std::string AAD_CHANNEL = "AAD";
const simple_ptr<NullNameValuePairs> s_pNullNameValuePairs(new NullNameValuePairs);
const NameValuePairs &g_nullNameValuePairs = *s_pNullNameValuePairs.m_p;
NullNameValuePairs s_nullNameValuePairs;
const NameValuePairs&g_nullNameValuePairs = dynamic_cast<const NameValuePairs&>(s_nullNameValuePairs);
#endif
NAMESPACE_END // CryptoPP

56
cryptlib.h
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@ -282,7 +282,9 @@ struct CRYPTOPP_DLL DecodingResult
//! then look at the Name namespace documentation to see what the type of each value is, or
//! alternatively, call GetIntValue() with the value name, and if the type is not int, a
//! ValueTypeMismatch exception will be thrown and you can get the actual type from the exception object.
class CRYPTOPP_NO_VTABLE NameValuePairs
//! \sa NullNameValuePairs, g_nullNameValuePairs,
//! <A HREF="http://www.cryptopp.com/wiki/NameValuePairs">NameValuePairs</A> on the Crypto++ wiki
class NameValuePairs
{
public:
virtual ~NameValuePairs() {}
@ -445,8 +447,52 @@ public:
CRYPTOPP_DLL virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const =0;
};
#if CRYPTOPP_DOXYGEN_PROCESSING
//! \class NullNameValuePairs
//! \brief Interface for retrieving values given their names
//! \details This class is used when no names or values are present. Typically a program uses
//! g_nullNameValuePairs rather than creating its own NullNameValuePairs object.
//! \details NullNameValuePairs always existed in cryptlib.cpp. Crypto++ 6.0 moved NullNameValuePairs
//! into the header. This allowed the library to define g_nullNameValuePairs in the header rather
//! than declaring it as extern and placing the definition in the source file. As an external definition
//! the string g_nullNameValuePairs was subject to static initialization order fiasco problems.
//! \sa NameValuePairs, g_nullNameValuePairs,
//! <A HREF="http://www.cryptopp.com/wiki/NameValuePairs">NameValuePairs</A> on the Crypto++ wiki
class NullNameValuePairs : public NameValuePairs
{
public:
NullNameValuePairs() {} // Clang complains a default ctor must be avilable
bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
{CRYPTOPP_UNUSED(name); CRYPTOPP_UNUSED(valueType); CRYPTOPP_UNUSED(pValue); return false;}
};
// More static initialization order fiasco workarounds. These definitions cannot be extern and
// cannot be static class members because they require a single definition in a source file.
ANONYMOUS_NAMESPACE_BEGIN
const NullNameValuePairs s_nullNameValuePairs;
ANONYMOUS_NAMESPACE_END
//! \brief Default channel for BufferedTransformation
//! \details DEFAULT_CHANNEL is equal to an empty string
//! \details Crypto++ 6.0 placed DEFAULT_CHANNEL in the header, rather than declaring it as extern and
//! placing the definition in the source file. As an external definition the string DEFAULT_CHANNEL
//! was subject to static initialization order fiasco problems.
static const std::string DEFAULT_CHANNEL;
//! \brief Channel for additional authenticated data
//! \details AAD_CHANNEL is equal to "AAD"
//! \details Crypto++ 6.0 placed AAD_CHANNEL in the header, rather than declaring it as extern and
//! placing the definition in the source file. As an external definition the string AAD_CHANNEL
//! was subject to static initialization order fiasco problems.
static const std::string AAD_CHANNEL("AAD");
//! \brief An empty set of name-value pairs
//! \details Crypto++ 6.0 placed g_nullNameValuePairs in the header, rather than declaring it as extern
//! and placing the definition in the source file. As an external definition the g_nullNameValuePairs
//! was subject to static initialization order fiasco problems.
static const NameValuePairs& g_nullNameValuePairs = s_nullNameValuePairs;
// Document additional name spaces which show up elsewhere in the sources.
#if CRYPTOPP_DOXYGEN_PROCESSING
//! \brief Namespace containing value name definitions.
//! \details Name is part of the CryptoPP namespace.
//! \details The semantics of value names, types are:
@ -470,7 +516,6 @@ DOCUMENTED_NAMESPACE_END
//! ...
//! CryptoPP::Weak::MD5 md5;
//! </pre>
DOCUMENTED_NAMESPACE_BEGIN(Weak)
// weak and wounded algorithms
DOCUMENTED_NAMESPACE_END
@ -483,9 +528,6 @@ DOCUMENTED_NAMESPACE_BEGIN(Test)
// testing and benchmark classes
DOCUMENTED_NAMESPACE_END
//! \brief An empty set of name-value pairs
extern CRYPTOPP_DLL const NameValuePairs &g_nullNameValuePairs;
// ********************************************************
//! \class Clonable
@ -1388,6 +1430,7 @@ public:
bool Wait(unsigned long milliseconds, CallStack const& callStack);
};
#if 0
//! \brief Default channel for BufferedTransformation
//! \details DEFAULT_CHANNEL is equal to an empty string
extern CRYPTOPP_DLL const std::string DEFAULT_CHANNEL;
@ -1395,6 +1438,7 @@ extern CRYPTOPP_DLL const std::string DEFAULT_CHANNEL;
//! \brief Channel for additional authenticated data
//! \details AAD_CHANNEL is equal to "AAD"
extern CRYPTOPP_DLL const std::string AAD_CHANNEL;
#endif
//! \brief Interface for buffered transformations
//! \details BufferedTransformation is a generalization of BlockTransformation,

132
integer.cpp
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@ -4,33 +4,25 @@
// Notes by JW: The Integer class needs to do two things. First, it needs to set function
// pointers on some platforms, like X86 and X64. The function pointers select a fast multiply
// and addition based on the cpu. Second, it wants to create Integer::Zero(), Integer::One()
// and Integer::Two(). The function pointers are initialized in the class InitializeInteger.
// Wei's original code was much simpler. It uses the Singleton pattern, but it always produced
// memory findings. The Singleton generates memory findings because it used for a Create on
// First Use pattern. Resource destruction effectivley requires running resource acquisition
// with dependencies in reverse. For resources provided through the Singletons, there is no way
// to express the dependency order to safely destroy resources.
// The difference in the changes below is we use platform and language specific remediations
// if they are available. If not available, then we fall back to Wei's original code. If
// NO_OS_DEPENDENCE is defined, then the library uses Wei's original code.
// Under all versions of C++ on Linux and Microsoft platforms, we can use GCC's init_priority
// or MSVC's init_seg(lib) to initialize the function pointers and create the Integers 0, 1 and 2
// after CRT startup. This avoids the Singletons and clears over half the reports of memory
// leaks. However, it does not apply to Apple or Sun platforms.
// C++11 allows us to use call_once to set the function pointers, and Integer does so when
// init_priority and init_seg(lib) are not available. The class also uses the Singleton pattern
// to ensure integers 0, 1 and 2 are available. The Singleton will produce memory findings, but
// we don't have anything else to use in this case.
// C++03 on platforms like Apple and Sun, we use a boolean flag to track when the function pointers
// have been set based on the cpu. Its just a Nifty Counter in disguise, and its similar to using
// the g_pAssignToInteger to track initialization. It has concurrency issues, but a race is not a
// problem. It does not matter if two threads both set the same pointers. The Singleton pattern
// is also used to ensure integers 0, 1 and 2 are available. The Singleton will produce memory
// findings, but we don't have anything else to use in this case.
// While not readily apparent, Integer does not need to inherit from InitializeInteger when
// init_priority and init_seg(lib) are available. They just create an InitializePointers object
// at the right time after CRT initialization. The additional class avoids the small runtime
// overhead associated with checking the flags, and hides the detail from the interface.
// and Integer::Two().
// The function pointers are initialized in the InitializeInteger class by calling
// SetFunctionPointers(). The call to SetFunctionPointers() is guarded to run once. If C++11
// dynamic initialization is available, then a standard run_once is used. Otherwise, and simple
// flag is used. The flag suffers a race, but the worse case is the same function pointers
// get written twice without leaking memory.
// For Integer::Zero(), Integer::One() and Integer::Two(), we use one of two strategies. First,
// if C++11 dynamic initialization is available, then we use a static variable. Second, if
// C++11 dynamic initialization is not available, then we fall back to Wei's original code of
// a Singleton.
// Wei's original code was much simpler. It simply used the Singleton pattern, but it always
// produced memory findings on some platforms. The Singleton generates memory findings because
// it uses a Create On First Use pattern (a dumb Nifty Counter) and the compiler had to be smart
// enough to fold them to return the same object. Unix and Linux compilers do a good job of folding
// objects, but Microsoft compilers do a rather poor job for some versions of the compilers.
// Another problem with the Singleton is resource destruction requires running resource acquisition
// in reverse. For resources provided through the Singletons, there is no way to express the
// dependency order to safely destroy resources. (That's one of the problems C++11 dynamic
// intitialization with concurrent execution is supposed to solve).
#include "pch.h"
#include "config.h"
@ -105,31 +97,16 @@
NAMESPACE_BEGIN(CryptoPP)
static void SetFunctionPointers();
#if defined(HAVE_GCC_INIT_PRIORITY) || defined(HAVE_MSC_INIT_PRIORITY)
// Add InitializePointers to perform the work of setting pointers once.
struct InitializePointers
{
InitializePointers()
{
SetFunctionPointers();
}
};
// Leave InitializeInteger empty so no work is done.
InitializeInteger::InitializeInteger()
{
}
#elif defined(CRYPTOPP_CXX11_SYNCHRONIZATION) && defined(CRYPTOPP_CXX11_DYNAMIC_INIT)
std::once_flag s_flag;
InitializeInteger::InitializeInteger()
{
#if !(HAVE_GCC_INIT_PRIORITY || HAVE_MSC_INIT_PRIORITY)
#if defined(CRYPTOPP_CXX11_SYNCHRONIZATION) && defined(CRYPTOPP_CXX11_DYNAMIC_INIT)
static std::once_flag s_flag;
std::call_once(s_flag, []() {
SetFunctionPointers();
});
}
#else
static bool s_flag;
InitializeInteger::InitializeInteger()
{
static bool s_flag;
MEMORY_BARRIER();
if (s_flag == false)
{
@ -137,8 +114,9 @@ InitializeInteger::InitializeInteger()
s_flag = true;
MEMORY_BARRIER();
}
#endif // C++11 or C++03 flag
#endif // not GCC and MSC init priorities
}
#endif
template <long i>
struct NewInteger
{
@ -147,28 +125,9 @@ struct NewInteger
return new Integer(i);
}
};
NAMESPACE_END
ANONYMOUS_NAMESPACE_BEGIN
#if defined(HAVE_GCC_INIT_PRIORITY)
const CryptoPP::InitializePointers s_init __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 30))) = CryptoPP::InitializePointers();
const CryptoPP::Integer s_zero __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 31))) = CryptoPP::Integer(0L);
const CryptoPP::Integer s_one __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 32))) = CryptoPP::Integer(1L);
const CryptoPP::Integer s_two __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 33))) = CryptoPP::Integer(2L);
#elif defined(HAVE_MSC_INIT_PRIORITY)
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU-030")
const CryptoPP::InitializePointers s_init;
const CryptoPP::Integer s_zero(0L);
const CryptoPP::Integer s_one(1L);
const CryptoPP::Integer s_two(2L);
#pragma warning(default: 4075)
#endif
ANONYMOUS_NAMESPACE_END
// ***************** Library code ********************
NAMESPACE_BEGIN(CryptoPP)
inline static int Compare(const word *A, const word *B, size_t N)
{
while (N--)
@ -3086,7 +3045,8 @@ Integer Integer::Power2(size_t e)
const Integer &Integer::Zero()
{
#if defined(HAVE_GCC_INIT_PRIORITY) || defined(HAVE_MSC_INIT_PRIORITY)
#if defined(CRYPTOPP_CXX11_DYNAMIC_INIT)
static Integer s_zero(0L);
return s_zero;
#else
return Singleton<Integer, NewInteger<0L> >().Ref();
@ -3095,7 +3055,8 @@ const Integer &Integer::Zero()
const Integer &Integer::One()
{
#if defined(HAVE_GCC_INIT_PRIORITY) || defined(HAVE_MSC_INIT_PRIORITY)
#if defined(CRYPTOPP_CXX11_DYNAMIC_INIT)
static Integer s_one(1L);
return s_one;
#else
return Singleton<Integer, NewInteger<1L> >().Ref();
@ -3104,7 +3065,8 @@ const Integer &Integer::One()
const Integer &Integer::Two()
{
#if defined(HAVE_GCC_INIT_PRIORITY) || defined(HAVE_MSC_INIT_PRIORITY)
#if defined(CRYPTOPP_CXX11_DYNAMIC_INIT)
static Integer s_two(2L);
return s_two;
#else
return Singleton<Integer, NewInteger<2L> >().Ref();
@ -4812,8 +4774,38 @@ bool AssignIntToInteger(const std::type_info &valueType, void *pInteger, const v
*reinterpret_cast<Integer *>(pInteger) = *reinterpret_cast<const int *>(pInt);
return true;
}
#endif // CRYPTOPP_NO_ASSIGN_TO_INTEGER
// *************************** C++ Static Initialization ***************************
ANONYMOUS_NAMESPACE_BEGIN
class InitInteger
{
public:
InitInteger()
{
SetFunctionPointers();
}
};
// This is not really needed because each Integer can dynamically initialize itself,
// but we take a peephole optimization and initialize the class once if init priorities are
// available. Dynamic initialization will be used if init priorities are not available.
#if HAVE_GCC_INIT_PRIORITY
const InitInteger s_init __attribute__ ((init_priority (CRYPTOPP_INIT_PRIORITY + 10))) = InitInteger();
#elif HAVE_MSC_INIT_PRIORITY
#pragma warning(disable: 4075)
#pragma init_seg(".CRT$XCU")
const InitInteger s_init;
#pragma warning(default: 4075)
#else
const InitInteger s_init;
#endif
ANONYMOUS_NAMESPACE_END
NAMESPACE_END
#endif
#endif // CRYPTOPP_IMPORTS