genbindings: handle function overloads

cmd/genbindings/main.go

@@ -60,6 +60,7 @@ func main() {
 
 	// AST transforms on our IL
 	astTransformOptional(parsed)
+	astTransformOverloads(parsed)
 
 	// Emit 3 code files from the intermediate format
 	outputName := filepath.Join(*outDir, "gen_"+strings.TrimSuffix(filepath.Base(*inputHeader), `.h`))

cmd/genbindings/transformoverload.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+)
+
+// astTransformOverloads renames methods if another method exists with the same
+// name.
+func astTransformOverloads(parsed *CppParsedHeader) {
+	for i, c := range parsed.Classes {
+
+		anyChange := false
+		existing := map[string]struct{}{}
+		for j, m := range c.Methods {
+
+			if _, ok := existing[m.MethodName]; !ok {
+				existing[m.MethodName] = struct{}{}
+				continue // No collision
+			}
+
+			// Collision - rename
+			anyChange = true
+
+			ctr := 2
+			var proposedName string
+			for {
+				proposedName = fmt.Sprintf("%s%d", m.MethodName, ctr)
+				if _, ok := existing[proposedName]; !ok {
+					break
+				}
+
+				ctr++ // Loop until we have a non-colliding name available
+			}
+
+			existing[proposedName] = struct{}{}
+			m.OverrideMethodName = m.MethodName
+			m.MethodName = proposedName
+			c.Methods[j] = m
+		}
+
+		if anyChange {
+			parsed.Classes[i] = c
+		}
+	}
+}