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02/02/2024 06:09:55 PM
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abi.go
15.02 KB
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abi_test.go
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all_test.go
214.57 KB
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arena.go
570 bytes
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asm_386.s
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asm_amd64.s
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asm_arm.s
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asm_arm64.s
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asm_loong64.s
2.87 KB
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asm_mips64x.s
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asm_mipsx.s
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asm_ppc64x.s
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asm_riscv64.s
2.58 KB
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asm_s390x.s
1.1 KB
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asm_wasm.s
1.15 KB
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benchmark_test.go
8.82 KB
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deepequal.go
7.42 KB
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example_test.go
4.53 KB
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export_test.go
3.73 KB
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float32reg_generic.go
681 bytes
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float32reg_ppc64x.s
838 bytes
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float32reg_riscv64.s
794 bytes
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internal
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makefunc.go
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nih_test.go
1004 bytes
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set_test.go
5.71 KB
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stubs_ppc64x.go
292 bytes
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stubs_riscv64.go
263 bytes
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swapper.go
2 KB
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tostring_test.go
2.14 KB
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type.go
80.47 KB
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type_test.go
1.26 KB
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value.go
118.95 KB
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visiblefields.go
2.97 KB
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visiblefields_test.go
5.27 KB
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Editing: swapper.go
Close
// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package reflect import ( "internal/abi" "internal/goarch" "internal/unsafeheader" "unsafe" ) // Swapper returns a function that swaps the elements in the provided // slice. // // Swapper panics if the provided interface is not a slice. func Swapper(slice any) func(i, j int) { v := ValueOf(slice) if v.Kind() != Slice { panic(&ValueError{Method: "Swapper", Kind: v.Kind()}) } // Fast path for slices of size 0 and 1. Nothing to swap. switch v.Len() { case 0: return func(i, j int) { panic("reflect: slice index out of range") } case 1: return func(i, j int) { if i != 0 || j != 0 { panic("reflect: slice index out of range") } } } typ := v.Type().Elem().common() size := typ.Size() hasPtr := typ.PtrBytes != 0 // Some common & small cases, without using memmove: if hasPtr { if size == goarch.PtrSize { ps := *(*[]unsafe.Pointer)(v.ptr) return func(i, j int) { ps[i], ps[j] = ps[j], ps[i] } } if typ.Kind() == abi.String { ss := *(*[]string)(v.ptr) return func(i, j int) { ss[i], ss[j] = ss[j], ss[i] } } } else { switch size { case 8: is := *(*[]int64)(v.ptr) return func(i, j int) { is[i], is[j] = is[j], is[i] } case 4: is := *(*[]int32)(v.ptr) return func(i, j int) { is[i], is[j] = is[j], is[i] } case 2: is := *(*[]int16)(v.ptr) return func(i, j int) { is[i], is[j] = is[j], is[i] } case 1: is := *(*[]int8)(v.ptr) return func(i, j int) { is[i], is[j] = is[j], is[i] } } } s := (*unsafeheader.Slice)(v.ptr) tmp := unsafe_New(typ) // swap scratch space return func(i, j int) { if uint(i) >= uint(s.Len) || uint(j) >= uint(s.Len) { panic("reflect: slice index out of range") } val1 := arrayAt(s.Data, i, size, "i < s.Len") val2 := arrayAt(s.Data, j, size, "j < s.Len") typedmemmove(typ, tmp, val1) typedmemmove(typ, val1, val2) typedmemmove(typ, val2, tmp) } }