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Add constexpr alignment stuff

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Smertig 2021-05-10 11:39:09 +03:00 committed by The Phantom Derpstorm
parent 8ccd92d69d
commit 1a7c9fc74b
1 changed files with 11 additions and 11 deletions
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22
include/sol/stack_core.hpp
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@ -78,7 +78,7 @@ namespace sol {
#endif #endif
} }
inline std::uintptr_t align(std::size_t alignment, std::uintptr_t ptr, std::size_t& space) { constexpr std::uintptr_t align(std::size_t alignment, std::uintptr_t ptr, std::size_t& space) {
// this handles arbitrary alignments... // this handles arbitrary alignments...
// make this into a power-of-2-only? // make this into a power-of-2-only?
// actually can't: this is a C++14-compatible framework, // actually can't: this is a C++14-compatible framework,
@ -94,13 +94,13 @@ namespace sol {
return reinterpret_cast<void*>(align(alignment, reinterpret_cast<std::uintptr_t>(ptr), space)); return reinterpret_cast<void*>(align(alignment, reinterpret_cast<std::uintptr_t>(ptr), space));
} }
inline std::uintptr_t align_one(std::size_t alignment, std::size_t size, std::uintptr_t target_alignment) { constexpr std::uintptr_t align_one(std::size_t alignment, std::size_t size, std::uintptr_t target_alignment) {
std::size_t space = (std::numeric_limits<std::size_t>::max)(); std::size_t space = (std::numeric_limits<std::size_t>::max)();
return align(alignment, target_alignment, space) + size; return align(alignment, target_alignment, space) + size;
} }
template <typename... Args> template <typename... Args>
std::size_t aligned_space_for(std::uintptr_t alignment) { constexpr std::size_t aligned_space_for(std::uintptr_t alignment) {
std::uintptr_t start = alignment; std::uintptr_t start = alignment;
(void)detail::swallow { int {}, (alignment = align_one(std::alignment_of_v<Args>, sizeof(Args), alignment), int {})... }; (void)detail::swallow { int {}, (alignment = align_one(std::alignment_of_v<Args>, sizeof(Args), alignment), int {})... };
return static_cast<std::size_t>(alignment - start); return static_cast<std::size_t>(alignment - start);
@ -219,8 +219,8 @@ namespace sol {
T** pointerpointer = static_cast<T**>(alloc_newuserdata(L, sizeof(T*))); T** pointerpointer = static_cast<T**>(alloc_newuserdata(L, sizeof(T*)));
return pointerpointer; return pointerpointer;
} }
static const std::size_t initial_size = aligned_space_for<T*>(0x0); constexpr std::size_t initial_size = aligned_space_for<T*>(0x0);
static const std::size_t misaligned_size = aligned_space_for<T*>(0x1); constexpr std::size_t misaligned_size = aligned_space_for<T*>(0x1);
std::size_t allocated_size = initial_size; std::size_t allocated_size = initial_size;
void* unadjusted = alloc_newuserdata(L, initial_size); void* unadjusted = alloc_newuserdata(L, initial_size);
@ -331,8 +331,8 @@ namespace sol {
compilers are optimized for aligned reads/writes compilers are optimized for aligned reads/writes
(and clang will barf UBsan errors on us for not being aligned) (and clang will barf UBsan errors on us for not being aligned)
*/ */
static const std::size_t initial_size = aligned_space_for<T*, T>(0x0); constexpr std::size_t initial_size = aligned_space_for<T*, T>(0x0);
static const std::size_t misaligned_size = aligned_space_for<T*, T>(0x1); constexpr std::size_t misaligned_size = aligned_space_for<T*, T>(0x1);
void* pointer_adjusted; void* pointer_adjusted;
void* data_adjusted; void* data_adjusted;
@ -382,8 +382,8 @@ namespace sol {
return mem; return mem;
} }
static const std::size_t initial_size = aligned_space_for<T*, unique_destructor, unique_tag, Real>(0x0); constexpr std::size_t initial_size = aligned_space_for<T*, unique_destructor, unique_tag, Real>(0x0);
static const std::size_t misaligned_size = aligned_space_for<T*, unique_destructor, unique_tag, Real>(0x1); constexpr std::size_t misaligned_size = aligned_space_for<T*, unique_destructor, unique_tag, Real>(0x1);
void* pointer_adjusted; void* pointer_adjusted;
void* dx_adjusted; void* dx_adjusted;
@ -450,8 +450,8 @@ namespace sol {
return pointer; return pointer;
} }
static const std::size_t initial_size = aligned_space_for<T>(0x0); constexpr std::size_t initial_size = aligned_space_for<T>(0x0);
static const std::size_t misaligned_size = aligned_space_for<T>(0x1); constexpr std::size_t misaligned_size = aligned_space_for<T>(0x1);
std::size_t allocated_size = initial_size; std::size_t allocated_size = initial_size;
void* unadjusted = alloc_newuserdata(L, allocated_size); void* unadjusted = alloc_newuserdata(L, allocated_size);