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// Copyright 2023 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.
//go:build go1.22
// +build go1.22
package ssa_test
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"go/types"
"testing"
"golang.org/x/tools/go/expect"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/ssautil"
"golang.org/x/tools/internal/testenv"
)
// TestMultipleGoversions tests that globals initialized to equivalent
// function literals are compiled based on the different GoVersion in each file.
func TestMultipleGoversions(t *testing.T) {
var contents = map[string]string{
"post.go": `
//go:build go1.22
package p
var distinct = func(l []int) {
for i := range l {
print(&i)
}
}
`,
"pre.go": `
package p
var same = func(l []int) {
for i := range l {
print(&i)
}
}
`,
}
fset := token.NewFileSet()
var files []*ast.File
for _, fname := range []string{"post.go", "pre.go"} {
file, err := parser.ParseFile(fset, fname, contents[fname], 0)
if err != nil {
t.Fatal(err)
}
files = append(files, file)
}
pkg := types.NewPackage("p", "")
conf := &types.Config{Importer: nil, GoVersion: "go1.21"}
p, _, err := ssautil.BuildPackage(conf, fset, pkg, files, ssa.SanityCheckFunctions)
if err != nil {
t.Fatal(err)
}
// Test that global is initialized to a function literal that was
// compiled to have the expected for loop range variable lifetime for i.
for _, test := range []struct {
global *ssa.Global
want string // basic block to []*ssa.Alloc.
}{
{p.Var("same"), "map[entry:[new int (i)]]"}, // i is allocated in the entry block.
{p.Var("distinct"), "map[rangeindex.body:[new int (i)]]"}, // i is allocated in the body block.
} {
// Find the function the test.name global is initialized to.
var fn *ssa.Function
for _, b := range p.Func("init").Blocks {
for _, instr := range b.Instrs {
if s, ok := instr.(*ssa.Store); ok && s.Addr == test.global {
fn, _ = s.Val.(*ssa.Function)
}
}
}
if fn == nil {
t.Fatalf("Failed to find *ssa.Function for initial value of global %s", test.global)
}
allocs := make(map[string][]string) // block comments -> []Alloc
for _, b := range fn.Blocks {
for _, instr := range b.Instrs {
if a, ok := instr.(*ssa.Alloc); ok {
allocs[b.Comment] = append(allocs[b.Comment], a.String())
}
}
}
if got := fmt.Sprint(allocs); got != test.want {
t.Errorf("[%s:=%s] expected the allocations to be in the basic blocks %q, got %q", test.global, fn, test.want, got)
}
}
}
const rangeOverIntSrc = `
package p
type I uint8
func noKey(x int) {
for range x {
// does not crash
}
}
func untypedConstantOperand() {
for i := range 10 {
print(i) /*@ types("int")*/
}
}
func unsignedOperand(x uint64) {
for i := range x {
print(i) /*@ types("uint64")*/
}
}
func namedOperand(x I) {
for i := range x {
print(i) /*@ types("p.I")*/
}
}
func typeparamOperand[T int](x T) {
for i := range x {
print(i) /*@ types("T")*/
}
}
func assignment(x I) {
var k I
for k = range x {
print(k) /*@ types("p.I")*/
}
}
`
// TestRangeOverInt tests that, in a range-over-int (#61405),
// the type of each range var v (identified by print(v) calls)
// has the expected type.
func TestRangeOverInt(t *testing.T) {
testenv.NeedsGoExperiment(t, "range")
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "p.go", rangeOverIntSrc, parser.ParseComments)
if err != nil {
t.Fatal(err)
}
pkg := types.NewPackage("p", "")
conf := &types.Config{}
p, _, err := ssautil.BuildPackage(conf, fset, pkg, []*ast.File{f}, ssa.SanityCheckFunctions)
if err != nil {
t.Fatal(err)
}
// Collect all notes in f, i.e. comments starting with "//@ types".
notes, err := expect.ExtractGo(fset, f)
if err != nil {
t.Fatal(err)
}
// Collect calls to the built-in print function.
fns := make(map[*ssa.Function]bool)
for _, mem := range p.Members {
if fn, ok := mem.(*ssa.Function); ok {
fns[fn] = true
}
}
probes := callsTo(fns, "print")
expectations := matchNotes(fset, notes, probes)
for call := range probes {
if expectations[call] == nil {
t.Errorf("Unmatched call: %v @ %s", call, fset.Position(call.Pos()))
}
}
// Check each expectation.
for call, note := range expectations {
var args []string
for _, a := range call.Args {
args = append(args, a.Type().String())
}
if got, want := fmt.Sprint(args), fmt.Sprint(note.Args); got != want {
at := fset.Position(call.Pos())
t.Errorf("%s: arguments to print had types %s, want %s", at, got, want)
logFunction(t, probes[call])
}
}
}
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