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AK: Add load64 and load_pointer to AK::ByteReader

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This lets us load misaligned 64 bit integers, and misaligned pointers
in a platform agnostic way.
This commit is contained in:
Andrew Kaster 2021-07-10 14:22:37 -06:00 committed by Ali Mohammad Pur
parent 19d34414bc
commit fac4eab415
Notes: sideshowbarker 2024-07-18 09:11:17 +09:00 
Author: https://github.com/ADKaster
Commit: https://github.com/SerenityOS/serenity/commit/fac4eab415c
Pull-request: https://github.com/SerenityOS/serenity/pull/8633
Issue: https://github.com/SerenityOS/serenity/issues/7158
Issue: https://github.com/SerenityOS/serenity/issues/8629
1 changed files with 28 additions and 0 deletions
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28
AK/ByteReader.h
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@ -49,6 +49,27 @@ struct ByteReader {
value = v._32;
}
static void load(const u8* address, u64& value)
{
union {
u64 _64;
u8 _8[8];
} v { ._64 = 0 };
__builtin_memcpy(&v._8, address, 8);
value = v._64;
}
template<typename T>
static T* load_pointer(const u8* address)
{
if constexpr (sizeof(T*) == 4) {
return reinterpret_cast<T*>(load32(address));
} else {
static_assert(sizeof(T*) == 8, "sizeof(T*) must be either 4 or 8");
return reinterpret_cast<T*>(load64(address));
}
}
static u16 load16(const u8* address)
{
u16 value;
@ -62,6 +83,13 @@ struct ByteReader {
load(address, value);
return value;
}
static u64 load64(const u8* address)
{
u64 value;
load(address, value);
return value;
}
};
}