diff --git a/gopls/doc/analyzers.md b/gopls/doc/analyzers.md
index 45db766719f..f78f1bdf732 100644
--- a/gopls/doc/analyzers.md
+++ b/gopls/doc/analyzers.md
@@ -636,6 +636,8 @@ will be simplified to:
 
 This is one of the simplifications that "gofmt -s" applies.
 
+This analyzer ignores generated code.
+
 Default: on.
 
 Package documentation: [simplifycompositelit](https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifycompositelit)
@@ -662,6 +664,8 @@ will be simplified to:
 
 This is one of the simplifications that "gofmt -s" applies.
 
+This analyzer ignores generated code.
+
 Default: on.
 
 Package documentation: [simplifyrange](https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifyrange)
@@ -680,6 +684,8 @@ will be simplified to:
 
 This is one of the simplifications that "gofmt -s" applies.
 
+This analyzer ignores generated code.
+
 Default: on.
 
 Package documentation: [simplifyslice](https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifyslice)
diff --git a/gopls/internal/analysis/simplifycompositelit/doc.go b/gopls/internal/analysis/simplifycompositelit/doc.go
index fe40596746e..bda74c7db3f 100644
--- a/gopls/internal/analysis/simplifycompositelit/doc.go
+++ b/gopls/internal/analysis/simplifycompositelit/doc.go
@@ -19,4 +19,6 @@
 //	[]T{{}, {}}
 //
 // This is one of the simplifications that "gofmt -s" applies.
+//
+// This analyzer ignores generated code.
 package simplifycompositelit
diff --git a/gopls/internal/analysis/simplifycompositelit/simplifycompositelit.go b/gopls/internal/analysis/simplifycompositelit/simplifycompositelit.go
index c651206b05f..1bdce1d658c 100644
--- a/gopls/internal/analysis/simplifycompositelit/simplifycompositelit.go
+++ b/gopls/internal/analysis/simplifycompositelit/simplifycompositelit.go
@@ -19,6 +19,7 @@ import (
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/inspect"
 	"golang.org/x/tools/go/ast/inspector"
+	"golang.org/x/tools/gopls/internal/util/astutil"
 	"golang.org/x/tools/internal/analysisinternal"
 )
 
@@ -34,9 +35,21 @@ var Analyzer = &analysis.Analyzer{
 }
 
 func run(pass *analysis.Pass) (interface{}, error) {
+	// Gather information whether file is generated or not
+	generated := make(map[*token.File]bool)
+	for _, file := range pass.Files {
+		if astutil.IsGenerated(file) {
+			generated[pass.Fset.File(file.Pos())] = true
+		}
+	}
+
 	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
 	nodeFilter := []ast.Node{(*ast.CompositeLit)(nil)}
 	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		if _, ok := generated[pass.Fset.File(n.Pos())]; ok {
+			return // skip checking if it's generated code
+		}
+
 		expr := n.(*ast.CompositeLit)
 
 		outer := expr
diff --git a/gopls/internal/analysis/simplifycompositelit/simplifycompositelit_test.go b/gopls/internal/analysis/simplifycompositelit/simplifycompositelit_test.go
index a355616e3fe..4445a0cbb2f 100644
--- a/gopls/internal/analysis/simplifycompositelit/simplifycompositelit_test.go
+++ b/gopls/internal/analysis/simplifycompositelit/simplifycompositelit_test.go
@@ -13,5 +13,5 @@ import (
 
 func Test(t *testing.T) {
 	testdata := analysistest.TestData()
-	analysistest.RunWithSuggestedFixes(t, testdata, simplifycompositelit.Analyzer, "a")
+	analysistest.RunWithSuggestedFixes(t, testdata, simplifycompositelit.Analyzer, "a", "generatedcode")
 }
diff --git a/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go b/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go
new file mode 100644
index 00000000000..7b11dc5ba47
--- /dev/null
+++ b/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go
@@ -0,0 +1,17 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+type T struct {
+	x, y int
+}
+
+var _ = [42]T{
+	T{}, // No simplification fix is offered in generated code.
+	T{1, 2}, // No simplification fix is offered in generated code.
+	T{3, 4}, // No simplification fix is offered in generated code.
+}
diff --git a/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go.golden b/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go.golden
new file mode 100644
index 00000000000..7b11dc5ba47
--- /dev/null
+++ b/gopls/internal/analysis/simplifycompositelit/testdata/src/generatedcode/generatedcode.go.golden
@@ -0,0 +1,17 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+type T struct {
+	x, y int
+}
+
+var _ = [42]T{
+	T{}, // No simplification fix is offered in generated code.
+	T{1, 2}, // No simplification fix is offered in generated code.
+	T{3, 4}, // No simplification fix is offered in generated code.
+}
diff --git a/gopls/internal/analysis/simplifyrange/doc.go b/gopls/internal/analysis/simplifyrange/doc.go
index f55ed56b35b..3d1145e0b09 100644
--- a/gopls/internal/analysis/simplifyrange/doc.go
+++ b/gopls/internal/analysis/simplifyrange/doc.go
@@ -27,4 +27,6 @@
 //	for range v {...}
 //
 // This is one of the simplifications that "gofmt -s" applies.
+//
+// This analyzer ignores generated code.
 package simplifyrange
diff --git a/gopls/internal/analysis/simplifyrange/simplifyrange.go b/gopls/internal/analysis/simplifyrange/simplifyrange.go
index 537e0e97081..ce9d450582b 100644
--- a/gopls/internal/analysis/simplifyrange/simplifyrange.go
+++ b/gopls/internal/analysis/simplifyrange/simplifyrange.go
@@ -14,6 +14,7 @@ import (
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/inspect"
 	"golang.org/x/tools/go/ast/inspector"
+	"golang.org/x/tools/gopls/internal/util/astutil"
 	"golang.org/x/tools/internal/analysisinternal"
 )
 
@@ -29,11 +30,23 @@ var Analyzer = &analysis.Analyzer{
 }
 
 func run(pass *analysis.Pass) (interface{}, error) {
+	// Gather information whether file is generated or not
+	generated := make(map[*token.File]bool)
+	for _, file := range pass.Files {
+		if astutil.IsGenerated(file) {
+			generated[pass.Fset.File(file.Pos())] = true
+		}
+	}
+
 	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
 	nodeFilter := []ast.Node{
 		(*ast.RangeStmt)(nil),
 	}
 	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		if _, ok := generated[pass.Fset.File(n.Pos())]; ok {
+			return // skip checking if it's generated code
+		}
+
 		var copy *ast.RangeStmt // shallow-copy the AST before modifying
 		{
 			x := *n.(*ast.RangeStmt)
diff --git a/gopls/internal/analysis/simplifyrange/simplifyrange_test.go b/gopls/internal/analysis/simplifyrange/simplifyrange_test.go
index fd927c56df1..973144c30e8 100644
--- a/gopls/internal/analysis/simplifyrange/simplifyrange_test.go
+++ b/gopls/internal/analysis/simplifyrange/simplifyrange_test.go
@@ -15,7 +15,7 @@ import (
 
 func Test(t *testing.T) {
 	testdata := analysistest.TestData()
-	analysistest.RunWithSuggestedFixes(t, testdata, simplifyrange.Analyzer, "a")
+	analysistest.RunWithSuggestedFixes(t, testdata, simplifyrange.Analyzer, "a", "generatedcode")
 	if slices.Contains(build.Default.ReleaseTags, "go1.23") { // uses iter.Seq
 		analysistest.RunWithSuggestedFixes(t, testdata, simplifyrange.Analyzer, "rangeoverfunc")
 	}
diff --git a/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go b/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go
new file mode 100644
index 00000000000..36b935c77eb
--- /dev/null
+++ b/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go
@@ -0,0 +1,18 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+import "log"
+
+func mgeneratedcode() {
+	maps := make(map[string]string)
+	for k, _ := range maps { // No simplification fix is offered in generated code.
+		log.Println(k)
+	}
+	for _ = range maps { // No simplification fix is offered in generated code.
+	}
+}
diff --git a/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go.golden b/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go.golden
new file mode 100644
index 00000000000..36b935c77eb
--- /dev/null
+++ b/gopls/internal/analysis/simplifyrange/testdata/src/generatedcode/generatedcode.go.golden
@@ -0,0 +1,18 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+import "log"
+
+func mgeneratedcode() {
+	maps := make(map[string]string)
+	for k, _ := range maps { // No simplification fix is offered in generated code.
+		log.Println(k)
+	}
+	for _ = range maps { // No simplification fix is offered in generated code.
+	}
+}
diff --git a/gopls/internal/analysis/simplifyslice/doc.go b/gopls/internal/analysis/simplifyslice/doc.go
index 2fb4c461054..4c6808acd53 100644
--- a/gopls/internal/analysis/simplifyslice/doc.go
+++ b/gopls/internal/analysis/simplifyslice/doc.go
@@ -19,4 +19,6 @@
 //	s[a:]
 //
 // This is one of the simplifications that "gofmt -s" applies.
+//
+// This analyzer ignores generated code.
 package simplifyslice
diff --git a/gopls/internal/analysis/simplifyslice/simplifyslice.go b/gopls/internal/analysis/simplifyslice/simplifyslice.go
index 0c7cc3ff284..343fca8b185 100644
--- a/gopls/internal/analysis/simplifyslice/simplifyslice.go
+++ b/gopls/internal/analysis/simplifyslice/simplifyslice.go
@@ -10,10 +10,12 @@ import (
 	"fmt"
 	"go/ast"
 	"go/printer"
+	"go/token"
 
 	"golang.org/x/tools/go/analysis"
 	"golang.org/x/tools/go/analysis/passes/inspect"
 	"golang.org/x/tools/go/ast/inspector"
+	"golang.org/x/tools/gopls/internal/util/astutil"
 	"golang.org/x/tools/internal/analysisinternal"
 )
 
@@ -37,11 +39,23 @@ var Analyzer = &analysis.Analyzer{
 //       x, y := b[:n], b[n:]
 
 func run(pass *analysis.Pass) (interface{}, error) {
+	// Gather information whether file is generated or not
+	generated := make(map[*token.File]bool)
+	for _, file := range pass.Files {
+		if astutil.IsGenerated(file) {
+			generated[pass.Fset.File(file.Pos())] = true
+		}
+	}
+
 	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
 	nodeFilter := []ast.Node{
 		(*ast.SliceExpr)(nil),
 	}
 	inspect.Preorder(nodeFilter, func(n ast.Node) {
+		if _, ok := generated[pass.Fset.File(n.Pos())]; ok {
+			return // skip checking if it's generated code
+		}
+
 		expr := n.(*ast.SliceExpr)
 		// - 3-index slices always require the 2nd and 3rd index
 		if expr.Max != nil {
diff --git a/gopls/internal/analysis/simplifyslice/simplifyslice_test.go b/gopls/internal/analysis/simplifyslice/simplifyslice_test.go
index 969161e3c90..7fc5f9af451 100644
--- a/gopls/internal/analysis/simplifyslice/simplifyslice_test.go
+++ b/gopls/internal/analysis/simplifyslice/simplifyslice_test.go
@@ -13,5 +13,5 @@ import (
 
 func Test(t *testing.T) {
 	testdata := analysistest.TestData()
-	analysistest.RunWithSuggestedFixes(t, testdata, simplifyslice.Analyzer, "a", "typeparams")
+	analysistest.RunWithSuggestedFixes(t, testdata, simplifyslice.Analyzer, "a", "generatedcode", "typeparams")
 }
diff --git a/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go b/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go
new file mode 100644
index 00000000000..a291600d11f
--- /dev/null
+++ b/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go
@@ -0,0 +1,72 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+var (
+	a [10]byte
+	b [20]float32
+	s []int
+	t struct {
+		s []byte
+	}
+
+	_ = a[0:]
+	_ = a[1:10]
+	_ = a[2:len(a)] // No simplification fix is offered in generated code.
+	_ = a[3:(len(a))]
+	_ = a[len(a)-1 : len(a)] // No simplification fix is offered in generated code.
+	_ = a[2:len(a):len(a)]
+
+	_ = a[:]
+	_ = a[:10]
+	_ = a[:len(a)] // No simplification fix is offered in generated code.
+	_ = a[:(len(a))]
+	_ = a[:len(a)-1]
+	_ = a[:len(a):len(a)]
+
+	_ = s[0:]
+	_ = s[1:10]
+	_ = s[2:len(s)] // No simplification fix is offered in generated code.
+	_ = s[3:(len(s))]
+	_ = s[len(a) : len(s)-1]
+	_ = s[0:len(b)]
+	_ = s[2:len(s):len(s)]
+
+	_ = s[:]
+	_ = s[:10]
+	_ = s[:len(s)] // No simplification fix is offered in generated code.
+	_ = s[:(len(s))]
+	_ = s[:len(s)-1]
+	_ = s[:len(b)]
+	_ = s[:len(s):len(s)]
+
+	_ = t.s[0:]
+	_ = t.s[1:10]
+	_ = t.s[2:len(t.s)]
+	_ = t.s[3:(len(t.s))]
+	_ = t.s[len(a) : len(t.s)-1]
+	_ = t.s[0:len(b)]
+	_ = t.s[2:len(t.s):len(t.s)]
+
+	_ = t.s[:]
+	_ = t.s[:10]
+	_ = t.s[:len(t.s)]
+	_ = t.s[:(len(t.s))]
+	_ = t.s[:len(t.s)-1]
+	_ = t.s[:len(b)]
+	_ = t.s[:len(t.s):len(t.s)]
+)
+
+func _() {
+	s := s[0:len(s)] // No simplification fix is offered in generated code.
+	_ = s
+}
+
+func m() {
+	maps := []int{}
+	_ = maps[1:len(maps)] // No simplification fix is offered in generated code.
+}
diff --git a/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go.golden b/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go.golden
new file mode 100644
index 00000000000..a291600d11f
--- /dev/null
+++ b/gopls/internal/analysis/simplifyslice/testdata/src/generatedcode/generatedcode.go.golden
@@ -0,0 +1,72 @@
+// Copyright 2024 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.
+
+// Code generated with somegen DO NOT EDIT.
+
+package testdata
+
+var (
+	a [10]byte
+	b [20]float32
+	s []int
+	t struct {
+		s []byte
+	}
+
+	_ = a[0:]
+	_ = a[1:10]
+	_ = a[2:len(a)] // No simplification fix is offered in generated code.
+	_ = a[3:(len(a))]
+	_ = a[len(a)-1 : len(a)] // No simplification fix is offered in generated code.
+	_ = a[2:len(a):len(a)]
+
+	_ = a[:]
+	_ = a[:10]
+	_ = a[:len(a)] // No simplification fix is offered in generated code.
+	_ = a[:(len(a))]
+	_ = a[:len(a)-1]
+	_ = a[:len(a):len(a)]
+
+	_ = s[0:]
+	_ = s[1:10]
+	_ = s[2:len(s)] // No simplification fix is offered in generated code.
+	_ = s[3:(len(s))]
+	_ = s[len(a) : len(s)-1]
+	_ = s[0:len(b)]
+	_ = s[2:len(s):len(s)]
+
+	_ = s[:]
+	_ = s[:10]
+	_ = s[:len(s)] // No simplification fix is offered in generated code.
+	_ = s[:(len(s))]
+	_ = s[:len(s)-1]
+	_ = s[:len(b)]
+	_ = s[:len(s):len(s)]
+
+	_ = t.s[0:]
+	_ = t.s[1:10]
+	_ = t.s[2:len(t.s)]
+	_ = t.s[3:(len(t.s))]
+	_ = t.s[len(a) : len(t.s)-1]
+	_ = t.s[0:len(b)]
+	_ = t.s[2:len(t.s):len(t.s)]
+
+	_ = t.s[:]
+	_ = t.s[:10]
+	_ = t.s[:len(t.s)]
+	_ = t.s[:(len(t.s))]
+	_ = t.s[:len(t.s)-1]
+	_ = t.s[:len(b)]
+	_ = t.s[:len(t.s):len(t.s)]
+)
+
+func _() {
+	s := s[0:len(s)] // No simplification fix is offered in generated code.
+	_ = s
+}
+
+func m() {
+	maps := []int{}
+	_ = maps[1:len(maps)] // No simplification fix is offered in generated code.
+}
diff --git a/gopls/internal/doc/api.json b/gopls/internal/doc/api.json
index 7de6006fb8a..322707dd085 100644
--- a/gopls/internal/doc/api.json
+++ b/gopls/internal/doc/api.json
@@ -524,17 +524,17 @@
 						},
 						{
 							"Name": "\"simplifycompositelit\"",
-							"Doc": "check for composite literal simplifications\n\nAn array, slice, or map composite literal of the form:\n\n\t[]T{T{}, T{}}\n\nwill be simplified to:\n\n\t[]T{{}, {}}\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+							"Doc": "check for composite literal simplifications\n\nAn array, slice, or map composite literal of the form:\n\n\t[]T{T{}, T{}}\n\nwill be simplified to:\n\n\t[]T{{}, {}}\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 							"Default": "true"
 						},
 						{
 							"Name": "\"simplifyrange\"",
-							"Doc": "check for range statement simplifications\n\nA range of the form:\n\n\tfor x, _ = range v {...}\n\nwill be simplified to:\n\n\tfor x = range v {...}\n\nA range of the form:\n\n\tfor _ = range v {...}\n\nwill be simplified to:\n\n\tfor range v {...}\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+							"Doc": "check for range statement simplifications\n\nA range of the form:\n\n\tfor x, _ = range v {...}\n\nwill be simplified to:\n\n\tfor x = range v {...}\n\nA range of the form:\n\n\tfor _ = range v {...}\n\nwill be simplified to:\n\n\tfor range v {...}\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 							"Default": "true"
 						},
 						{
 							"Name": "\"simplifyslice\"",
-							"Doc": "check for slice simplifications\n\nA slice expression of the form:\n\n\ts[a:len(s)]\n\nwill be simplified to:\n\n\ts[a:]\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+							"Doc": "check for slice simplifications\n\nA slice expression of the form:\n\n\ts[a:len(s)]\n\nwill be simplified to:\n\n\ts[a:]\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 							"Default": "true"
 						},
 						{
@@ -1186,19 +1186,19 @@
 		},
 		{
 			"Name": "simplifycompositelit",
-			"Doc": "check for composite literal simplifications\n\nAn array, slice, or map composite literal of the form:\n\n\t[]T{T{}, T{}}\n\nwill be simplified to:\n\n\t[]T{{}, {}}\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+			"Doc": "check for composite literal simplifications\n\nAn array, slice, or map composite literal of the form:\n\n\t[]T{T{}, T{}}\n\nwill be simplified to:\n\n\t[]T{{}, {}}\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 			"URL": "https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifycompositelit",
 			"Default": true
 		},
 		{
 			"Name": "simplifyrange",
-			"Doc": "check for range statement simplifications\n\nA range of the form:\n\n\tfor x, _ = range v {...}\n\nwill be simplified to:\n\n\tfor x = range v {...}\n\nA range of the form:\n\n\tfor _ = range v {...}\n\nwill be simplified to:\n\n\tfor range v {...}\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+			"Doc": "check for range statement simplifications\n\nA range of the form:\n\n\tfor x, _ = range v {...}\n\nwill be simplified to:\n\n\tfor x = range v {...}\n\nA range of the form:\n\n\tfor _ = range v {...}\n\nwill be simplified to:\n\n\tfor range v {...}\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 			"URL": "https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifyrange",
 			"Default": true
 		},
 		{
 			"Name": "simplifyslice",
-			"Doc": "check for slice simplifications\n\nA slice expression of the form:\n\n\ts[a:len(s)]\n\nwill be simplified to:\n\n\ts[a:]\n\nThis is one of the simplifications that \"gofmt -s\" applies.",
+			"Doc": "check for slice simplifications\n\nA slice expression of the form:\n\n\ts[a:len(s)]\n\nwill be simplified to:\n\n\ts[a:]\n\nThis is one of the simplifications that \"gofmt -s\" applies.\n\nThis analyzer ignores generated code.",
 			"URL": "https://pkg.go.dev/golang.org/x/tools/gopls/internal/analysis/simplifyslice",
 			"Default": true
 		},
diff --git a/gopls/internal/util/astutil/util.go b/gopls/internal/util/astutil/util.go
index ac7515d1daf..b9cf9a03c1d 100644
--- a/gopls/internal/util/astutil/util.go
+++ b/gopls/internal/util/astutil/util.go
@@ -7,6 +7,7 @@ package astutil
 import (
 	"go/ast"
 	"go/token"
+	"strings"
 
 	"golang.org/x/tools/internal/typeparams"
 )
@@ -69,3 +70,25 @@ L: // unpack receiver type
 func NodeContains(n ast.Node, pos token.Pos) bool {
 	return n.Pos() <= pos && pos <= n.End()
 }
+
+// IsGenerated check if a file is generated code
+func IsGenerated(file *ast.File) bool {
+	// TODO: replace this implementation with calling function ast.IsGenerated when go1.21 is assured
+	for _, group := range file.Comments {
+		for _, comment := range group.List {
+			if comment.Pos() > file.Package {
+				break // after package declaration
+			}
+			// opt: check Contains first to avoid unnecessary array allocation in Split.
+			const prefix = "// Code generated "
+			if strings.Contains(comment.Text, prefix) {
+				for _, line := range strings.Split(comment.Text, "\n") {
+					if strings.HasPrefix(line, prefix) && strings.HasSuffix(line, " DO NOT EDIT.") {
+						return true
+					}
+				}
+			}
+		}
+	}
+	return false
+}