cmd/cgo: updated exported function parameter nams

functions exported through cgo will now require that parameter names use
only ASCII characters. this way, the declarations in the exported header
file will retain the proper names for parameters

Fixes: #37746

src/cmd/cgo/out.go

@@ -22,6 +22,7 @@ import (
 	"regexp"
 	"sort"
 	"strings"
+	"unicode"
 )
 
 var (
@@ -915,7 +916,12 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
 				if i > 0 || fn.Recv != nil {
 					s += ", "
 				}
-				s += fmt.Sprintf("%s p%d", p.cgoType(atype).C, i)
+				for j := 0; j < len(aname); j++ {
+					if aname[j] > unicode.MaxASCII {
+						fatalf("error: invalid non ASCII character found in cgo exported function parameter: %s", aname)
+					}
+				}
+				s += fmt.Sprintf("%s %s", p.cgoType(atype).C, aname)
 			})
 		s += ")"
 
@@ -941,7 +947,7 @@ func (p *Package) writeExports(fgo2, fm, fgcc, fgcch io.Writer) {
 		}
 		forFieldList(fntype.Params,
 			func(i int, aname string, atype ast.Expr) {
-				fmt.Fprintf(fgcc, "\ta.p%d = p%d;\n", i, i)
+				fmt.Fprintf(fgcc, "\ta.p%d = %s;\n", i, aname)
 			})
 		fmt.Fprintf(fgcc, "\t_cgo_tsan_release();\n")
 		fmt.Fprintf(fgcc, "\tcrosscall2(_cgoexp%s_%s, &a, %d, _cgo_ctxt);\n", cPrefix, exp.ExpName, off)