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loader_go117_test.go
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loader_go117_test.go
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// +build go1.17,!go1.20
/*
* Copyright 2021 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package loader
import (
`errors`
`fmt`
`reflect`
`runtime`
`runtime/debug`
`testing`
`unsafe`
`github.com/stretchr/testify/assert`
)
func TestLoader_Load(t *testing.T) {
bc := []byte {
0x48, 0xc7, 0x00, 0xd2, 0x04, 0x00, 0x00, // MOVQ $1234, (%rax)
0xc3, // RET
}
v0 := 0
fn := Loader(bc).Load("test", 0, 8)
(*(*func(*int))(unsafe.Pointer(&fn)))(&v0)
assert.Equal(t, 1234, v0)
println(runtime.FuncForPC(*(*uintptr)(fn)).Name())
}
func faker1(in string) error {
runtime.KeepAlive(in)
return errors.New("1")
}
func faker2(in string) error {
runtime.KeepAlive(in)
return errors.New("2")
}
func faker4(in string) error {
return nil
}
func TestStackMap(t *testing.T) {
args1, locals1 := stackMap(faker1)
fi1 := findfunc(reflect.ValueOf(faker1).Pointer())
fmt.Printf("func1: %#v, args: %x, locals: %x\n", fi1, args1, locals1)
args2, locals2 := stackMap(faker2)
fi2 := findfunc(reflect.ValueOf(faker2).Pointer())
fmt.Printf("func2: %#v, args: %x, locals: %x\n", fi2, args2, locals2)
args4, locals4 := stackMap(faker4)
fi4 := findfunc(reflect.ValueOf(faker4).Pointer())
fmt.Printf("func4: %#v, args: %x, locals: %x\n", fi4, args4, locals4)
if reflect.DeepEqual(fi1, fi2) || reflect.DeepEqual(fi1, fi2) {
t.Fatal()
}
if args1 != args2 || locals1 != locals2 {
t.Fatal()
}
if args1 == args4 || locals1 == locals4 || args2 == args4 || locals2 == locals4 {
t.Fatal()
}
}
func funcWrap(f func(i *int)) int {
var ret int
var x int = 0
runtime.SetFinalizer(&x, func(xp *int){
fmt.Printf("x got dropped: %x\n", unsafe.Pointer(xp))
})
f(&x)
ret = x
return ret
}
func TestLoadWithStackMap(t *testing.T) {
var f = func(i *int) {
*i = 1234
}
v1 := funcWrap(f)
bc := []byte {
0x48, 0xc7, 0x00, 0xd2, 0x04, 0x00, 0x00, // MOVQ $1234, (%rax)
0xc3, // RET
}
fn := Loader(bc).LoadWithFaker("test", 0, 8, f)
f2 := (*(*func(*int))(unsafe.Pointer(&fn)))
v2 := funcWrap(f2)
runtime.GC()
debug.FreeOSMemory()
println(v1, v2)
assert.Equal(t, v1, v2)
}