a848d720db
This commit finally introduces unit tests for the compiler, to check whether input Go code is converted to the expected output IR. To make this necessary, a few refactors were needed. Hopefully these refactors (to compile a program package by package instead of all at once) will eventually become standard, so that packages can all be compiled separate from each other and be cached between compiles.
41 строка
1 КиБ
Go
41 строка
1 КиБ
Go
package main
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// This file tests various operations on pointers, such as pointer arithmetic
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// and dereferencing pointers.
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import "unsafe"
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// Dereference pointers.
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func pointerDerefZero(x *[0]int) [0]int {
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return *x // This is a no-op, there is nothing to load.
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}
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// Unsafe pointer casts, they are sometimes a no-op.
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func pointerCastFromUnsafe(x unsafe.Pointer) *int {
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return (*int)(x)
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}
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func pointerCastToUnsafe(x *int) unsafe.Pointer {
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return unsafe.Pointer(x)
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}
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func pointerCastToUnsafeNoop(x *byte) unsafe.Pointer {
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return unsafe.Pointer(x)
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}
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// The compiler has support for a few special cast+add patterns that are
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// transformed into a single GEP.
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func pointerUnsafeGEPFixedOffset(ptr *byte) *byte {
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return (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + 10))
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}
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func pointerUnsafeGEPByteOffset(ptr *byte, offset uintptr) *byte {
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return (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + offset))
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}
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func pointerUnsafeGEPIntOffset(ptr *int32, offset uintptr) *int32 {
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return (*int32)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + offset*4))
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}
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