tools/syz-declextract: make fixed header more readable

Combine all fixed header parts in a single raw string literal.

1 files changed, 18 insertions, 15 deletions

diff --git a/tools/syz-declextract/run.go b/tools/syz-declextract/run.go
index a680ea12c..40d6497bb 100644
--- a/tools/syz-declextract/run.go
+++ b/tools/syz-declextract/run.go
@@ -157,6 +157,16 @@ func getMinimalOutput(out string, syscallNames map[string][]string) []string {
 }
 
 func makeOutput(nodes []ast.Node) []byte {
+	header := `
+# Code generated by syz-declextract. DO NOT EDIT.
+include <include/vdso/bits.h>
+include <include/linux/types.h>
+_ = __NR_mmap2
+`
+	eh := ast.LoggingHandler
+	desc := ast.Parse([]byte(header), "", eh)
+	nodes = append(nodes, desc.Nodes...)
+
 	slices.SortFunc(nodes, func(a, b ast.Node) int {
 		return strings.Compare(ast.SerializeNode(a), ast.SerializeNode(b))
 	})
@@ -179,7 +189,7 @@ func makeOutput(nodes []ast.Node) []byte {
 				continue
 			}
 			structs = append(structs, node)
-		case *ast.Include, *ast.TypeDef, *ast.Resource, *ast.IntFlags, *ast.NewLine:
+		case *ast.Include, *ast.TypeDef, *ast.Resource, *ast.IntFlags, *ast.NewLine, *ast.Comment:
 			continue
 		default:
 			_, typ, _ := node.Info()
@@ -203,13 +213,6 @@ func makeOutput(nodes []ast.Node) []byte {
 		return a.Name.Name == b.Name.Name
 	})
 
-	autoGeneratedNotice := "# Code generated by syz-declextract. DO NOT EDIT.\n"
-	commonKernelHeaders := "include <include/vdso/bits.h>\ninclude <include/linux/types.h>"
-	var netlinkNames []string
-	mmap2 := "_ = __NR_mmap2\n"
-	eh := ast.LoggingHandler
-	desc := ast.Parse([]byte(autoGeneratedNotice+commonKernelHeaders), "", eh)
-	desc.Nodes = append(desc.Nodes, nodes...)
 	usedNetlink := make(map[string]bool)
 	for _, node := range syscalls {
 		if node.CallName == sendmsg && len(node.Args[1].Type.Args) == 2 && len(node.Args[1].Type.Args[1].Args) > 1 {
@@ -222,11 +225,11 @@ func makeOutput(nodes []ast.Node) []byte {
 				continue
 			}
 		}
-		desc.Nodes = append(desc.Nodes, node)
+		nodes = append(nodes, node)
 	}
-	desc.Nodes = append(desc.Nodes, ast.Parse([]byte(mmap2), "", eh).Nodes...)
+	var netlinkNames []string
 	for _, node := range structs {
-		desc.Nodes = append(desc.Nodes, node)
+		nodes = append(nodes, node)
 		name := node.Name.Name
 		if !usedNetlink[name] && !strings.HasSuffix(name, "$auto_record") {
 			netlinkNames = append(netlinkNames, name)
@@ -246,11 +249,11 @@ auto_union [
 	if netlinkUnionParsed == nil {
 		tool.Failf("parsing error")
 	}
-	desc.Nodes = append(desc.Nodes, netlinkUnionParsed.Nodes...)
+	nodes = append(nodes, netlinkUnionParsed.Nodes...)
 
-	// New lines are added in the parsing step. This is why we need to Format (serialize the description), Parse, then
-	// Format again.
-	return ast.Format(ast.Parse(ast.Format(desc), "", eh))
+	// New lines are added in the parsing step. This is why we need to Format (serialize the description),
+	// Parse, then Format again.
+	return ast.Format(ast.Parse(ast.Format(&ast.Description{nodes}), "", eh))
 }
 
 func worker(outputs chan output, files chan string, binary, compilationDatabase, format string) {