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Randy Reddig
37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
//go:build mips
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package reflectlite
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import "unsafe"
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// loadValue loads a value that may or may not be word-aligned. The number of
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// bytes given in size are loaded. The biggest possible size it can load is that
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// of an uintptr.
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func loadValue(ptr unsafe.Pointer, size uintptr) uintptr {
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loadedValue := uintptr(0)
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for i := uintptr(0); i < size; i++ {
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loadedValue <<= 8
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loadedValue |= uintptr(*(*byte)(ptr))
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ptr = unsafe.Add(ptr, 1)
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}
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return loadedValue
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}
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// storeValue is the inverse of loadValue. It stores a value to a pointer that
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// doesn't need to be aligned.
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func storeValue(ptr unsafe.Pointer, size, value uintptr) {
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// This could perhaps be optimized using bits.ReverseBytes32 if needed.
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value <<= (unsafe.Sizeof(uintptr(0)) - size) * 8
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for i := uintptr(0); i < size; i++ {
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*(*byte)(ptr) = byte(value >> ((unsafe.Sizeof(uintptr(0)) - 1) * 8))
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ptr = unsafe.Add(ptr, 1)
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value <<= 8
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}
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}
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// maskAndShift cuts out a part of a uintptr. Note that the offset may not be 0.
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func maskAndShift(value, offset, size uintptr) uintptr {
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mask := ^uintptr(0) >> ((unsafe.Sizeof(uintptr(0)) - size) * 8)
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return (uintptr(value) >> ((unsafe.Sizeof(uintptr(0)) - offset - size) * 8)) & mask
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}
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