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// Copyright 2019 The gVisor Authors.
//
// 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 gomarshal
import (
"fmt"
"go/ast"
"io"
"strings"
)
var standardImports = []string{
"fmt",
"reflect",
"testing",
"gvisor.dev/gvisor/tools/go_marshal/analysis",
}
type testGenerator struct {
sourceBuffer
// The type we're serializing.
t *ast.TypeSpec
// Receiver argument for generated methods.
r string
// Imports used by generated code.
imports *importTable
// Import statement for the package declaring the type we generated code
// for. We need this to construct test instances for the type, since the
// tests aren't written in the same package.
decl *importStmt
}
func newTestGenerator(t *ast.TypeSpec) *testGenerator {
if _, ok := t.Type.(*ast.StructType); !ok {
panic(fmt.Sprintf("Attempting to generate code for a not struct type %v", t))
}
g := &testGenerator{
t: t,
r: receiverName(t),
imports: newImportTable(),
}
for _, i := range standardImports {
g.imports.add(i).markUsed()
}
return g
}
func (g *testGenerator) typeName() string {
return g.t.Name.Name
}
func (g *testGenerator) forEachField(fn func(f *ast.Field)) {
// This is guaranteed to succeed because g.t is always a struct.
st := g.t.Type.(*ast.StructType)
for _, field := range st.Fields.List {
fn(field)
}
}
func (g *testGenerator) testFuncName(base string) string {
return fmt.Sprintf("%s%s", base, strings.Title(g.t.Name.Name))
}
func (g *testGenerator) inTestFunction(name string, body func()) {
g.emit("func %s(t *testing.T) {\n", g.testFuncName(name))
g.inIndent(body)
g.emit("}\n\n")
}
func (g *testGenerator) emitTestNonZeroSize() {
g.inTestFunction("TestSizeNonZero", func() {
g.emit("x := &%s{}\n", g.typeName())
g.emit("if x.SizeBytes() == 0 {\n")
g.inIndent(func() {
g.emit("t.Fatal(\"Marshallable.Size() should not return zero\")\n")
})
g.emit("}\n")
})
}
func (g *testGenerator) emitTestSuspectAlignment() {
g.inTestFunction("TestSuspectAlignment", func() {
g.emit("x := %s{}\n", g.typeName())
g.emit("analysis.AlignmentCheck(t, reflect.TypeOf(x))\n")
})
}
func (g *testGenerator) emitTestMarshalUnmarshalPreservesData() {
g.inTestFunction("TestSafeMarshalUnmarshalPreservesData", func() {
g.emit("var x, y, z, yUnsafe, zUnsafe %s\n", g.typeName())
g.emit("analysis.RandomizeValue(&x)\n\n")
g.emit("buf := make([]byte, x.SizeBytes())\n")
g.emit("x.MarshalBytes(buf)\n")
g.emit("bufUnsafe := make([]byte, x.SizeBytes())\n")
g.emit("x.MarshalUnsafe(bufUnsafe)\n\n")
g.emit("y.UnmarshalBytes(buf)\n")
g.emit("if !reflect.DeepEqual(x, y) {\n")
g.inIndent(func() {
g.emit("t.Fatal(fmt.Sprintf(\"Data corrupted across Marshal/Unmarshal cycle:\\nBefore: %%+v\\nAfter: %%+v\\n\", x, y))\n")
})
g.emit("}\n")
g.emit("yUnsafe.UnmarshalBytes(bufUnsafe)\n")
g.emit("if !reflect.DeepEqual(x, yUnsafe) {\n")
g.inIndent(func() {
g.emit("t.Fatal(fmt.Sprintf(\"Data corrupted across MarshalUnsafe/Unmarshal cycle:\\nBefore: %%+v\\nAfter: %%+v\\n\", x, yUnsafe))\n")
})
g.emit("}\n\n")
g.emit("z.UnmarshalUnsafe(buf)\n")
g.emit("if !reflect.DeepEqual(x, z) {\n")
g.inIndent(func() {
g.emit("t.Fatal(fmt.Sprintf(\"Data corrupted across Marshal/UnmarshalUnsafe cycle:\\nBefore: %%+v\\nAfter: %%+v\\n\", x, z))\n")
})
g.emit("}\n")
g.emit("zUnsafe.UnmarshalUnsafe(bufUnsafe)\n")
g.emit("if !reflect.DeepEqual(x, zUnsafe) {\n")
g.inIndent(func() {
g.emit("t.Fatal(fmt.Sprintf(\"Data corrupted across MarshalUnsafe/UnmarshalUnsafe cycle:\\nBefore: %%+v\\nAfter: %%+v\\n\", x, zUnsafe))\n")
})
g.emit("}\n")
})
}
func (g *testGenerator) emitTests() {
g.emitTestNonZeroSize()
g.emitTestSuspectAlignment()
g.emitTestMarshalUnmarshalPreservesData()
}
func (g *testGenerator) write(out io.Writer) error {
return g.sourceBuffer.write(out)
}
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