bind: correct methods' return arg type mapping in obj-c binding.

Change-Id: Ieda05982c7f894c5603103b8890658e682e97423
Reviewed-on: https://go-review.googlesource.com/11307
Reviewed-by: David Crawshaw <crawshaw@golang.org>

bind/genobjc.go

@@ -254,7 +254,7 @@ func (s *funcSummary) asMethod(g *objcGen) string {
 		if len(params) > 0 || i > 0 {
 			key = p.name
 		}
-		params = append(params, fmt.Sprintf("%s:(%s)%s", key, g.objcType(p.typ), p.name))
+		params = append(params, fmt.Sprintf("%s:(%s)%s", key, g.objcType(p.typ)+"*", p.name))
 	}
 	return fmt.Sprintf("(%s)%s%s", s.ret, s.name, strings.Join(params, " "))
 }

bind/testdata/structs.go

@@ -13,6 +13,10 @@ func (s *S) Sum() float64 {
 	return s.X + s.Y
 }
 
+func (s *S) Identity() (*S, error) {
+	return s, nil
+}
+
 func Identity(s *S) *S {
 	return s
 }

bind/testdata/structs.go.golden

@@ -36,7 +36,8 @@ const (
 	proxyS_X_Set_Code    = 0x01f
 	proxyS_Y_Get_Code    = 0x10f
 	proxyS_Y_Set_Code    = 0x11f
-	proxyS_Sum_Code   = 0x00c
+	proxyS_Identity_Code = 0x00c
+	proxyS_Sum_Code      = 0x10c
 )
 
 type proxyS seq.Ref
@@ -65,6 +66,18 @@ func proxyS_Y_Get(out, in *seq.Buffer) {
 	out.WriteFloat64(v)
 }
 
+func proxyS_Identity(out, in *seq.Buffer) {
+	ref := in.ReadRef()
+	v := ref.Get().(*structs.S)
+	res, err := v.Identity()
+	out.WriteGoRef(res)
+	if err == nil {
+		out.WriteString("")
+	} else {
+		out.WriteString(err.Error())
+	}
+}
+
 func proxyS_Sum(out, in *seq.Buffer) {
 	ref := in.ReadRef()
 	v := ref.Get().(*structs.S)
@@ -77,6 +90,7 @@ func init() {
 	seq.Register(proxyS_Descriptor, proxyS_X_Get_Code, proxyS_X_Get)
 	seq.Register(proxyS_Descriptor, proxyS_Y_Set_Code, proxyS_Y_Set)
 	seq.Register(proxyS_Descriptor, proxyS_Y_Get_Code, proxyS_Y_Get)
+	seq.Register(proxyS_Descriptor, proxyS_Identity_Code, proxyS_Identity)
 	seq.Register(proxyS_Descriptor, proxyS_Sum_Code, proxyS_Sum)
 }
 

bind/testdata/structs.java.golden

@@ -39,7 +39,8 @@ public abstract class Structs {
         private static final int FIELD_X_SET = 0x01f;
         private static final int FIELD_Y_GET = 0x10f;
         private static final int FIELD_Y_SET = 0x11f;
-        private static final int CALL_Sum = 0x00c;
+        private static final int CALL_Identity = 0x00c;
+        private static final int CALL_Sum = 0x10c;
         
         private go.Seq.Ref ref;
         
@@ -83,6 +84,20 @@ public abstract class Structs {
             Seq.send(DESCRIPTOR, FIELD_Y_SET, in, out);
         }
         
+        public S Identity() throws Exception {
+            go.Seq _in = new go.Seq();
+            go.Seq _out = new go.Seq();
+            S _result;
+            _in.writeRef(ref);
+            Seq.send(DESCRIPTOR, CALL_Identity, _in, _out);
+            _result = new S(_out.readRef());
+            String _err = _out.readString();
+            if (_err != null) {
+                throw new Exception(_err);
+            }
+            return _result;
+        }
+        
         public double Sum() {
             go.Seq _in = new go.Seq();
             go.Seq _out = new go.Seq();

bind/testdata/structs.objc.h.golden

@@ -19,6 +19,7 @@
 - (void)setX:(double)v;
 - (double)Y;
 - (void)setY:(double)v;
+- (BOOL)Identity:(GoStructs_S**)ret0_ error:(NSError**)error;
 - (double)Sum;
 @end
 

bind/testdata/structs.objc.m.golden

@@ -19,7 +19,8 @@ static NSString *errDomain = @"go.structs";
 #define _GO_structs_S_FIELD_X_SET_ (0x01f)
 #define _GO_structs_S_FIELD_Y_GET_ (0x10f)
 #define _GO_structs_S_FIELD_Y_SET_ (0x11f)
-#define _GO_structs_S_Sum_ (0x00c)
+#define _GO_structs_S_Identity_ (0x00c)
+#define _GO_structs_S_Sum_ (0x10c)
 
 @implementation GoStructs_S {
 }
@@ -72,6 +73,29 @@ static NSString *errDomain = @"go.structs";
 	go_seq_free(&out_);
 }
 
+- (BOOL)Identity:(GoStructs_S**)ret0_ error:(NSError**)error {
+	GoSeq in_ = {};
+	GoSeq out_ = {};
+	go_seq_writeRef(&in_, self.ref);
+	go_seq_send(_GO_structs_S_DESCRIPTOR_, _GO_structs_S_Identity_, &in_, &out_);
+	GoSeqRef* ret0__ref = go_seq_readRef(&out_);
+	if (ret0_ != NULL) {
+		*ret0_ = ret0__ref.obj;
+		if (*ret0_ == NULL) {
+			*ret0_ = [[GoStructs_S alloc] initWithRef:ret0__ref];
+		}
+	}
+	NSString* _error = go_seq_readUTF8(&out_);
+	if ([_error length] != 0 && error != nil) {
+		NSMutableDictionary *details = [NSMutableDictionary dictionary];
+		[details setValue:_error forKey:NSLocalizedDescriptionKey];
+		*error = [NSError errorWithDomain:errDomain code:1 userInfo:details];
+	}
+	go_seq_free(&in_);
+	go_seq_free(&out_);
+	return ([_error length] == 0);
+}
+
 - (double)Sum {
 	GoSeq in_ = {};
 	GoSeq out_ = {};