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// Copyright 2015 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 main
import (
"bytes"
"fmt"
"go/format"
"log"
"os"
)
// This program generates tests to verify that zeroing operations
// zero the data they are supposed to and clobber no adjacent values.
// run as `go run zeroGen.go`. A file called zero.go
// will be written into the parent directory containing the tests.
var sizes = [...]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16, 17, 23, 24, 25, 31, 32, 33, 63, 64, 65, 1023, 1024, 1025}
var usizes = [...]int{8, 16, 24, 32, 64, 256}
func main() {
w := new(bytes.Buffer)
fmt.Fprintf(w, "// Code generated by gen/zeroGen.go. DO NOT EDIT.\n\n")
fmt.Fprintf(w, "package main\n")
fmt.Fprintf(w, "import \"testing\"\n")
for _, s := range sizes {
// type for test
fmt.Fprintf(w, "type Z%d struct {\n", s)
fmt.Fprintf(w, " pre [8]byte\n")
fmt.Fprintf(w, " mid [%d]byte\n", s)
fmt.Fprintf(w, " post [8]byte\n")
fmt.Fprintf(w, "}\n")
// function being tested
fmt.Fprintf(w, "//go:noinline\n")
fmt.Fprintf(w, "func zero%d_ssa(x *[%d]byte) {\n", s, s)
fmt.Fprintf(w, " *x = [%d]byte{}\n", s)
fmt.Fprintf(w, "}\n")
// testing harness
fmt.Fprintf(w, "func testZero%d(t *testing.T) {\n", s)
fmt.Fprintf(w, " a := Z%d{[8]byte{255,255,255,255,255,255,255,255},[%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "255,")
}
fmt.Fprintf(w, "},[8]byte{255,255,255,255,255,255,255,255}}\n")
fmt.Fprintf(w, " zero%d_ssa(&a.mid)\n", s)
fmt.Fprintf(w, " want := Z%d{[8]byte{255,255,255,255,255,255,255,255},[%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "0,")
}
fmt.Fprintf(w, "},[8]byte{255,255,255,255,255,255,255,255}}\n")
fmt.Fprintf(w, " if a != want {\n")
fmt.Fprintf(w, " t.Errorf(\"zero%d got=%%v, want %%v\\n\", a, want)\n", s)
fmt.Fprintf(w, " }\n")
fmt.Fprintf(w, "}\n")
}
for _, s := range usizes {
// type for test
fmt.Fprintf(w, "type Z%du1 struct {\n", s)
fmt.Fprintf(w, " b bool\n")
fmt.Fprintf(w, " val [%d]byte\n", s)
fmt.Fprintf(w, "}\n")
fmt.Fprintf(w, "type Z%du2 struct {\n", s)
fmt.Fprintf(w, " i uint16\n")
fmt.Fprintf(w, " val [%d]byte\n", s)
fmt.Fprintf(w, "}\n")
// function being tested
fmt.Fprintf(w, "//go:noinline\n")
fmt.Fprintf(w, "func zero%du1_ssa(t *Z%du1) {\n", s, s)
fmt.Fprintf(w, " t.val = [%d]byte{}\n", s)
fmt.Fprintf(w, "}\n")
// function being tested
fmt.Fprintf(w, "//go:noinline\n")
fmt.Fprintf(w, "func zero%du2_ssa(t *Z%du2) {\n", s, s)
fmt.Fprintf(w, " t.val = [%d]byte{}\n", s)
fmt.Fprintf(w, "}\n")
// testing harness
fmt.Fprintf(w, "func testZero%du(t *testing.T) {\n", s)
fmt.Fprintf(w, " a := Z%du1{false, [%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "255,")
}
fmt.Fprintf(w, "}}\n")
fmt.Fprintf(w, " zero%du1_ssa(&a)\n", s)
fmt.Fprintf(w, " want := Z%du1{false, [%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "0,")
}
fmt.Fprintf(w, "}}\n")
fmt.Fprintf(w, " if a != want {\n")
fmt.Fprintf(w, " t.Errorf(\"zero%du2 got=%%v, want %%v\\n\", a, want)\n", s)
fmt.Fprintf(w, " }\n")
fmt.Fprintf(w, " b := Z%du2{15, [%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "255,")
}
fmt.Fprintf(w, "}}\n")
fmt.Fprintf(w, " zero%du2_ssa(&b)\n", s)
fmt.Fprintf(w, " wantb := Z%du2{15, [%d]byte{", s, s)
for i := 0; i < s; i++ {
fmt.Fprintf(w, "0,")
}
fmt.Fprintf(w, "}}\n")
fmt.Fprintf(w, " if b != wantb {\n")
fmt.Fprintf(w, " t.Errorf(\"zero%du2 got=%%v, want %%v\\n\", b, wantb)\n", s)
fmt.Fprintf(w, " }\n")
fmt.Fprintf(w, "}\n")
}
// boilerplate at end
fmt.Fprintf(w, "func TestZero(t *testing.T) {\n")
for _, s := range sizes {
fmt.Fprintf(w, " testZero%d(t)\n", s)
}
for _, s := range usizes {
fmt.Fprintf(w, " testZero%du(t)\n", s)
}
fmt.Fprintf(w, "}\n")
// gofmt result
b := w.Bytes()
src, err := format.Source(b)
if err != nil {
fmt.Printf("%s\n", b)
panic(err)
}
// write to file
err = os.WriteFile("../zero_test.go", src, 0666)
if err != nil {
log.Fatalf("can't write output: %v\n", err)
}
}
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