mirror of
https://github.com/cookiengineer/audacity
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77dab158c3
... Fixing many conditional operators with explicit construction of wxString instead of simple string literals; And fixing allocation of more strictly aligned structures on Mac, without need for 10.14 as the minimum SDK, by means of some class-specific operators new and delete.
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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MemoryX.cpp
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Paul Licameli
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**********************************************************************/
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#include "MemoryX.h"
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// Make the symbol table non-empty
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UTILITY_API void lib_utility_dummy_symbol()
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{}
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#ifdef __APPLE__
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constexpr auto sizeof_align_val = sizeof(std::align_val_t);
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void *NonInterferingBase::operator new(std::size_t count, std::align_val_t al)
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{
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using namespace std;
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// Get an allocation with sufficient extra space to remember the alignment
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// (And to do that, adjust the alignment to be not less than the alignment of
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// an alignment value!).
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// Also increase the allocation by one entire alignment.
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al = max( al, static_cast<align_val_t>( alignof(align_val_t) ) );
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const auto al_as_size = static_cast<size_t>(al);
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auto ptr = static_cast<char*>(
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::operator new( count + sizeof_align_val + al_as_size ) );
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// Adjust the pointer to a properly aligned one, with a space just before it
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// to remember the adjustment
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ptr += sizeof_align_val;
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auto integer = reinterpret_cast<uintptr_t>(ptr);
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const auto partial = integer % al_as_size;
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auto adjustment = partial ? al_as_size - partial : 0;
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integer += adjustment;
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ptr = reinterpret_cast<char*>(integer);
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// Remember the adjustment
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*(reinterpret_cast<size_t*>(ptr) - 1) = adjustment;
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return ptr;
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}
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void NonInterferingBase::operator delete(void *ptr, std::align_val_t al)
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{
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// Find the adjustment
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auto adjustment = *(reinterpret_cast<size_t*>(ptr) - 1);
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// Apply the adjustment
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auto p = reinterpret_cast<char*>(ptr) - adjustment - sizeof_align_val;
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// Call through to default operator
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::operator delete(p);
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}
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#endif
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