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compiler: implement unsafe.Alignof and unsafe.Sizeof for generic code

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For some reason, these aren't lowered when a generic function is
instantiated by the SSA package.

I've left unsafe.Offsetof to be implemented later, it's a bit difficult
to do correctly the way the code is currently structured.
This commit is contained in:
Ayke van Laethem
2022-07-28 14:14:23 +02:00
committed by Ron Evans
parent 70c52ef1b4
commit 7b1e5f6f99
3 changed files with 26 additions and 0 deletions
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compiler/testdata/generics.go
Vendored
+6
View File
@@ -1,5 +1,7 @@
package main
import "unsafe"
type Coord interface {
int | float32
}
@@ -9,6 +11,8 @@ type Point[T Coord] struct {
}
func Add[T Coord](a, b Point[T]) Point[T] {
checkSize(unsafe.Alignof(a))
checkSize(unsafe.Sizeof(a))
return Point[T]{
X: a.X + b.X,
Y: a.Y + b.Y,
@@ -22,3 +26,5 @@ func main() {
var ai, bi Point[int]
Add(ai, bi)
}
func checkSize(uintptr)
compiler/testdata/generics.ll
Vendored
+6
View File
@@ -94,6 +94,8 @@ entry:
store float %b.X, float* %b.repack14, align 8
%b.repack15 = getelementptr inbounds %"main.Point[float32]", %"main.Point[float32]"* %b, i32 0, i32 1
store float %b.Y, float* %b.repack15, align 4
call void @main.checkSize(i32 4, i8* undef) #2
call void @main.checkSize(i32 8, i8* undef) #2
%complit.repack = getelementptr inbounds %"main.Point[float32]", %"main.Point[float32]"* %complit, i32 0, i32 0
store float 0.000000e+00, float* %complit.repack, align 8
%complit.repack17 = getelementptr inbounds %"main.Point[float32]", %"main.Point[float32]"* %complit, i32 0, i32 1
@@ -157,6 +159,8 @@ store.throw7: ; preds = %store.next
unreachable
}
declare void @main.checkSize(i32, i8*) #0
declare void @runtime.nilPanic(i8*) #0
; Function Attrs: nounwind
@@ -185,6 +189,8 @@ entry:
store i32 %b.X, i32* %b.repack14, align 8
%b.repack15 = getelementptr inbounds %"main.Point[int]", %"main.Point[int]"* %b, i32 0, i32 1
store i32 %b.Y, i32* %b.repack15, align 4
call void @main.checkSize(i32 4, i8* undef) #2
call void @main.checkSize(i32 8, i8* undef) #2
%complit.repack = getelementptr inbounds %"main.Point[int]", %"main.Point[int]"* %complit, i32 0, i32 0
store i32 0, i32* %complit.repack, align 8
%complit.repack17 = getelementptr inbounds %"main.Point[int]", %"main.Point[int]"* %complit, i32 0, i32 1