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Add macro version of pointer tagging

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This commit is contained in:
Jakob Rath 2023-07-27 15:32:02 +02:00
parent 305943a091
commit fe03918f6d
1 changed files with 10 additions and 3 deletions
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13
src/util/tptr.h
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@ -21,7 +21,7 @@ Revision History:
#include <cstdint> #include <cstdint>
#include "util/machine.h" #include "util/machine.h"
#include <cstdint> #include "util/debug.h"
#define TAG_SHIFT PTR_ALIGNMENT #define TAG_SHIFT PTR_ALIGNMENT
#define ALIGNMENT_VALUE (1 << PTR_ALIGNMENT) #define ALIGNMENT_VALUE (1 << PTR_ALIGNMENT)
@ -48,10 +48,17 @@ U unbox(T* ptr) {
return static_cast<U>(reinterpret_cast<std::uintptr_t>(ptr) >> PTR_ALIGNMENT); return static_cast<U>(reinterpret_cast<std::uintptr_t>(ptr) >> PTR_ALIGNMENT);
} }
template <typename T>
unsigned get_tag(T* ptr) {
return reinterpret_cast<std::uintptr_t>(ptr) & TAG_MASK;
}
template <typename T, typename U> template <typename T, typename U>
T* box(U val) { T* box(U val, std::uintptr_t tag = 0) {
static_assert( sizeof(T*) >= sizeof(U) + PTR_ALIGNMENT ); static_assert( sizeof(T*) >= sizeof(U) + PTR_ALIGNMENT );
T* ptr = reinterpret_cast<T*>(static_cast<std::uintptr_t>(val) << PTR_ALIGNMENT); SASSERT_EQ(tag & PTR_MASK, 0);
T* ptr = reinterpret_cast<T*>((static_cast<std::uintptr_t>(val) << PTR_ALIGNMENT) | tag);
SASSERT_EQ(val, unbox<U>(ptr)); // roundtrip of conversion integer -> pointer -> integer is not actually guaranteed by the C++ standard (but seems fine in practice, as indicated by previous usage of BOXINT/UNBOXINT) SASSERT_EQ(val, unbox<U>(ptr)); // roundtrip of conversion integer -> pointer -> integer is not actually guaranteed by the C++ standard (but seems fine in practice, as indicated by previous usage of BOXINT/UNBOXINT)
SASSERT_EQ(tag, get_tag(ptr));
return ptr; return ptr;
} }