cgo: implement Go arrays (constant arrays in C)

loader/libclang.go

@@ -268,6 +268,16 @@ func (info *fileInfo) makeASTType(typ C.CXType) ast.Expr {
 			Star: info.importCPos,
 			X:    info.makeASTType(C.clang_getPointeeType(typ)),
 		}
+	case C.CXType_ConstantArray:
+		return &ast.ArrayType{
+			Lbrack: info.importCPos,
+			Len: &ast.BasicLit{
+				ValuePos: info.importCPos,
+				Kind:     token.INT,
+				Value:    strconv.FormatInt(int64(C.clang_getArraySize(typ)), 10),
+			},
+			Elt: info.makeASTType(C.clang_getElementType(typ)),
+		}
 	case C.CXType_FunctionProto:
 		// Be compatible with gc, which uses the *[0]byte type for function
 		// pointer types.

testdata/cgo/main.c

@@ -9,6 +9,7 @@ _Complex float globalComplexFloat = 4.1+3.3i;
 _Complex double globalComplexDouble = 4.2+3.4i;
 _Complex double globalComplexLongDouble = 4.3+3.5i;
 collection_t globalStruct = {256, -123456, 3.14};
+short globalArray[3] = {5, 6, 7};
 
 int fortytwo() {
 	return 42;

testdata/cgo/main.go

@@ -37,6 +37,8 @@ func main() {
 	println("complex double:", C.globalComplexDouble)
 	println("complex long double:", C.globalComplexLongDouble)
 	println("struct:", C.globalStruct.s, C.globalStruct.l, C.globalStruct.f)
+	var _ [3]C.short = C.globalArray
+	println("array:", C.globalArray[0], C.globalArray[1], C.globalArray[2])
 }
 
 //export mul

testdata/cgo/main.h

@@ -21,6 +21,7 @@ extern _Complex float globalComplexFloat;
 extern _Complex double globalComplexDouble;
 extern _Complex double globalComplexLongDouble;
 extern collection_t globalStruct;
+extern short globalArray[3];
 
 // test duplicate definitions
 int add(int a, int b);