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75 lines
3.4 KiB
C
75 lines
3.4 KiB
C
// allocate.h - written and placed in the public domain by Jeffrey Walton
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// The functions in allocate.h and allocate.cpp were originally in misc.h
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// and misc.cpp. They were extracted in September 2019 to sidestep a circular
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// dependency with misc.h and secblock.h.
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/// \file allocate.h
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/// \brief Functions for allocating aligned buffers
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#ifndef CRYPTOPP_ALLOCATE_H
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#define CRYPTOPP_ALLOCATE_H
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#include "config.h"
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#include "cryptlib.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief Attempts to reclaim unused memory
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/// \throws bad_alloc
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/// \details In the normal course of running a program, a request for memory
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/// normally succeeds. If a call to AlignedAllocate or UnalignedAllocate fails,
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/// then CallNewHandler is called in n effort to recover. Internally,
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/// CallNewHandler calls set_new_handler(nullptr) in an effort to free memory.
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/// There is no guarantee CallNewHandler will be able to obtain more memory so
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/// an allocation succeeds. If the call to set_new_handler fails, then CallNewHandler
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/// throws a bad_alloc exception.
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/// \throws bad_alloc on failure
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/// \since Crypto++ 5.0
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/// \sa AlignedAllocate, AlignedDeallocate, UnalignedAllocate, UnalignedDeallocate
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CRYPTOPP_DLL void CRYPTOPP_API CallNewHandler();
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/// \brief Allocates a buffer on 16-byte boundary
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/// \param size the size of the buffer
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/// \details AlignedAllocate is primarily used when the data will be
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/// proccessed by SSE, NEON, ARMv8 or PowerPC instructions. The assembly
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/// language routines rely on the alignment. If the alignment is not
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/// respected, then a SIGBUS could be generated on Unix and Linux, and an
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/// EXCEPTION_DATATYPE_MISALIGNMENT could be generated on Windows.
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/// \details Formerly, AlignedAllocate and AlignedDeallocate were only
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/// available on certain platforms when CRYTPOPP_DISABLE_ASM was not in
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/// effect. However, Android and iOS debug simulator builds got into a
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/// state where the aligned allocator was not available and caused link
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/// failures.
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/// \since AlignedAllocate for SIMD since Crypto++ 1.0, AlignedAllocate
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/// for all builds since Crypto++ 8.1
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/// \sa AlignedDeallocate, UnalignedAllocate, UnalignedDeallocate, CallNewHandler,
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/// <A HREF="http://github.com/weidai11/cryptopp/issues/779">Issue 779</A>
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CRYPTOPP_DLL void* CRYPTOPP_API AlignedAllocate(size_t size);
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/// \brief Frees a buffer allocated with AlignedAllocate
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/// \param ptr the buffer to free
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/// \since AlignedDeallocate for SIMD since Crypto++ 1.0, AlignedAllocate
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/// for all builds since Crypto++ 8.1
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/// \sa AlignedAllocate, UnalignedAllocate, UnalignedDeallocate, CallNewHandler,
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/// <A HREF="http://github.com/weidai11/cryptopp/issues/779">Issue 779</A>
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CRYPTOPP_DLL void CRYPTOPP_API AlignedDeallocate(void *ptr);
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/// \brief Allocates a buffer
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/// \param size the size of the buffer
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/// \since Crypto++ 1.0
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/// \sa AlignedAllocate, AlignedDeallocate, UnalignedDeallocate, CallNewHandler,
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/// <A HREF="http://github.com/weidai11/cryptopp/issues/779">Issue 779</A>
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CRYPTOPP_DLL void * CRYPTOPP_API UnalignedAllocate(size_t size);
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/// \brief Frees a buffer allocated with UnalignedAllocate
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/// \param ptr the buffer to free
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/// \since Crypto++ 1.0
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/// \sa AlignedAllocate, AlignedDeallocate, UnalignedAllocate, CallNewHandler,
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/// <A HREF="http://github.com/weidai11/cryptopp/issues/779">Issue 779</A>
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CRYPTOPP_DLL void CRYPTOPP_API UnalignedDeallocate(void *ptr);
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NAMESPACE_END
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#endif // CRYPTOPP_ALLOCATE_H
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