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// Copyright 2012 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 runtime_test
import (
"runtime"
"testing"
)
type I1 interface {
Method1()
}
type I2 interface {
Method1()
Method2()
}
type TS uint16
type TM uintptr
type TL [2]uintptr
func (TS) Method1() {}
func (TS) Method2() {}
func (TM) Method1() {}
func (TM) Method2() {}
func (TL) Method1() {}
func (TL) Method2() {}
type T8 uint8
type T16 uint16
type T32 uint32
type T64 uint64
type Tstr string
type Tslice []byte
func (T8) Method1() {}
func (T16) Method1() {}
func (T32) Method1() {}
func (T64) Method1() {}
func (Tstr) Method1() {}
func (Tslice) Method1() {}
var (
e any
e_ any
i1 I1
i2 I2
ts TS
tm TM
tl TL
ok bool
)
// Issue 9370
func TestCmpIfaceConcreteAlloc(t *testing.T) {
if runtime.Compiler != "gc" {
t.Skip("skipping on non-gc compiler")
}
n := testing.AllocsPerRun(1, func() {
_ = e == ts
_ = i1 == ts
_ = e == 1
})
if n > 0 {
t.Fatalf("iface cmp allocs=%v; want 0", n)
}
}
func BenchmarkEqEfaceConcrete(b *testing.B) {
for i := 0; i < b.N; i++ {
_ = e == ts
}
}
func BenchmarkEqIfaceConcrete(b *testing.B) {
for i := 0; i < b.N; i++ {
_ = i1 == ts
}
}
func BenchmarkNeEfaceConcrete(b *testing.B) {
for i := 0; i < b.N; i++ {
_ = e != ts
}
}
func BenchmarkNeIfaceConcrete(b *testing.B) {
for i := 0; i < b.N; i++ {
_ = i1 != ts
}
}
func BenchmarkConvT2EByteSized(b *testing.B) {
b.Run("bool", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = yes
}
})
b.Run("uint8", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = eight8
}
})
}
func BenchmarkConvT2ESmall(b *testing.B) {
for i := 0; i < b.N; i++ {
e = ts
}
}
func BenchmarkConvT2EUintptr(b *testing.B) {
for i := 0; i < b.N; i++ {
e = tm
}
}
func BenchmarkConvT2ELarge(b *testing.B) {
for i := 0; i < b.N; i++ {
e = tl
}
}
func BenchmarkConvT2ISmall(b *testing.B) {
for i := 0; i < b.N; i++ {
i1 = ts
}
}
func BenchmarkConvT2IUintptr(b *testing.B) {
for i := 0; i < b.N; i++ {
i1 = tm
}
}
func BenchmarkConvT2ILarge(b *testing.B) {
for i := 0; i < b.N; i++ {
i1 = tl
}
}
func BenchmarkConvI2E(b *testing.B) {
i2 = tm
for i := 0; i < b.N; i++ {
e = i2
}
}
func BenchmarkConvI2I(b *testing.B) {
i2 = tm
for i := 0; i < b.N; i++ {
i1 = i2
}
}
func BenchmarkAssertE2T(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
tm = e.(TM)
}
}
func BenchmarkAssertE2TLarge(b *testing.B) {
e = tl
for i := 0; i < b.N; i++ {
tl = e.(TL)
}
}
func BenchmarkAssertE2I(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
i1 = e.(I1)
}
}
func BenchmarkAssertI2T(b *testing.B) {
i1 = tm
for i := 0; i < b.N; i++ {
tm = i1.(TM)
}
}
func BenchmarkAssertI2I(b *testing.B) {
i1 = tm
for i := 0; i < b.N; i++ {
i2 = i1.(I2)
}
}
func BenchmarkAssertI2E(b *testing.B) {
i1 = tm
for i := 0; i < b.N; i++ {
e = i1.(any)
}
}
func BenchmarkAssertE2E(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
e_ = e
}
}
func BenchmarkAssertE2T2(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
tm, ok = e.(TM)
}
}
func BenchmarkAssertE2T2Blank(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
_, ok = e.(TM)
}
}
func BenchmarkAssertI2E2(b *testing.B) {
i1 = tm
for i := 0; i < b.N; i++ {
e, ok = i1.(any)
}
}
func BenchmarkAssertI2E2Blank(b *testing.B) {
i1 = tm
for i := 0; i < b.N; i++ {
_, ok = i1.(any)
}
}
func BenchmarkAssertE2E2(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
e_, ok = e.(any)
}
}
func BenchmarkAssertE2E2Blank(b *testing.B) {
e = tm
for i := 0; i < b.N; i++ {
_, ok = e.(any)
}
}
func TestNonEscapingConvT2E(t *testing.T) {
m := make(map[any]bool)
m[42] = true
if !m[42] {
t.Fatalf("42 is not present in the map")
}
if m[0] {
t.Fatalf("0 is present in the map")
}
n := testing.AllocsPerRun(1000, func() {
if m[0] {
t.Fatalf("0 is present in the map")
}
})
if n != 0 {
t.Fatalf("want 0 allocs, got %v", n)
}
}
func TestNonEscapingConvT2I(t *testing.T) {
m := make(map[I1]bool)
m[TM(42)] = true
if !m[TM(42)] {
t.Fatalf("42 is not present in the map")
}
if m[TM(0)] {
t.Fatalf("0 is present in the map")
}
n := testing.AllocsPerRun(1000, func() {
if m[TM(0)] {
t.Fatalf("0 is present in the map")
}
})
if n != 0 {
t.Fatalf("want 0 allocs, got %v", n)
}
}
func TestZeroConvT2x(t *testing.T) {
tests := []struct {
name string
fn func()
}{
{name: "E8", fn: func() { e = eight8 }}, // any byte-sized value does not allocate
{name: "E16", fn: func() { e = zero16 }}, // zero values do not allocate
{name: "E32", fn: func() { e = zero32 }},
{name: "E64", fn: func() { e = zero64 }},
{name: "Estr", fn: func() { e = zerostr }},
{name: "Eslice", fn: func() { e = zeroslice }},
{name: "Econstflt", fn: func() { e = 99.0 }}, // constants do not allocate
{name: "Econststr", fn: func() { e = "change" }},
{name: "I8", fn: func() { i1 = eight8I }},
{name: "I16", fn: func() { i1 = zero16I }},
{name: "I32", fn: func() { i1 = zero32I }},
{name: "I64", fn: func() { i1 = zero64I }},
{name: "Istr", fn: func() { i1 = zerostrI }},
{name: "Islice", fn: func() { i1 = zerosliceI }},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
n := testing.AllocsPerRun(1000, test.fn)
if n != 0 {
t.Errorf("want zero allocs, got %v", n)
}
})
}
}
var (
eight8 uint8 = 8
eight8I T8 = 8
yes bool = true
zero16 uint16 = 0
zero16I T16 = 0
one16 uint16 = 1
thousand16 uint16 = 1000
zero32 uint32 = 0
zero32I T32 = 0
one32 uint32 = 1
thousand32 uint32 = 1000
zero64 uint64 = 0
zero64I T64 = 0
one64 uint64 = 1
thousand64 uint64 = 1000
zerostr string = ""
zerostrI Tstr = ""
nzstr string = "abc"
zeroslice []byte = nil
zerosliceI Tslice = nil
nzslice []byte = []byte("abc")
zerobig [512]byte
nzbig [512]byte = [512]byte{511: 1}
)
func BenchmarkConvT2Ezero(b *testing.B) {
b.Run("zero", func(b *testing.B) {
b.Run("16", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zero16
}
})
b.Run("32", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zero32
}
})
b.Run("64", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zero64
}
})
b.Run("str", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zerostr
}
})
b.Run("slice", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zeroslice
}
})
b.Run("big", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = zerobig
}
})
})
b.Run("nonzero", func(b *testing.B) {
b.Run("str", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = nzstr
}
})
b.Run("slice", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = nzslice
}
})
b.Run("big", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = nzbig
}
})
})
b.Run("smallint", func(b *testing.B) {
b.Run("16", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = one16
}
})
b.Run("32", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = one32
}
})
b.Run("64", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = one64
}
})
})
b.Run("largeint", func(b *testing.B) {
b.Run("16", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = thousand16
}
})
b.Run("32", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = thousand32
}
})
b.Run("64", func(b *testing.B) {
for i := 0; i < b.N; i++ {
e = thousand64
}
})
})
}