45  * ABI implementation for macOS on Apple silicon. Based on AAPCS with
46  * changes to va_list and passing arguments on the stack.
47  */
48 public final class MacOsAArch64Linker implements CLinker {
49     private static MacOsAArch64Linker instance;
50 
51     static final long ADDRESS_SIZE = 64; // bits
52 
53     public static MacOsAArch64Linker getInstance() {
54         if (instance == null) {
55             instance = new MacOsAArch64Linker();
56         }
57         return instance;
58     }
59 
60     @Override
61     public final MethodHandle downcallHandle(FunctionDescriptor function) {
62         Objects.requireNonNull(function);
63         MethodType type = SharedUtils.inferMethodType(function, false);
64         MethodHandle handle = CallArranger.MACOS.arrangeDowncall(type, function);
65         if (!type.returnType().equals(MemorySegment.class)) {
66             // not returning segment, just insert a throwing allocator
67             handle = MethodHandles.insertArguments(handle, 1, SharedUtils.THROWING_ALLOCATOR);
68         }
69         return SharedUtils.wrapDowncall(handle, function);
70     }
71 
72     @Override
73     public final NativeSymbol upcallStub(MethodHandle target, FunctionDescriptor function, ResourceScope scope) {
74         Objects.requireNonNull(scope);
75         Objects.requireNonNull(target);
76         Objects.requireNonNull(function);
77         MethodType type = SharedUtils.inferMethodType(function, true);
78         if (!type.equals(target.type())) {
79             throw new IllegalArgumentException("Wrong method handle type: " + target.type());
80         }
81         return CallArranger.MACOS.arrangeUpcall(target, target.type(), function, scope);
82     }
83 
84     public static VaList newVaList(Consumer<VaList.Builder> actions, ResourceScope scope) {
85         MacOsAArch64VaList.Builder builder = MacOsAArch64VaList.builder(scope);
86         actions.accept(builder);
87         return builder.build();
88     }

45  * ABI implementation for macOS on Apple silicon. Based on AAPCS with
46  * changes to va_list and passing arguments on the stack.
47  */
48 public final class MacOsAArch64Linker implements CLinker {
49     private static MacOsAArch64Linker instance;
50 
51     static final long ADDRESS_SIZE = 64; // bits
52 
53     public static MacOsAArch64Linker getInstance() {
54         if (instance == null) {
55             instance = new MacOsAArch64Linker();
56         }
57         return instance;
58     }
59 
60     @Override
61     public final MethodHandle downcallHandle(FunctionDescriptor function) {
62         Objects.requireNonNull(function);
63         MethodType type = SharedUtils.inferMethodType(function, false);
64         MethodHandle handle = CallArranger.MACOS.arrangeDowncall(type, function);
65         handle = SharedUtils.maybeInsertAllocator(handle);



66         return SharedUtils.wrapDowncall(handle, function);
67     }
68 
69     @Override
70     public final NativeSymbol upcallStub(MethodHandle target, FunctionDescriptor function, ResourceScope scope) {
71         Objects.requireNonNull(scope);
72         Objects.requireNonNull(target);
73         Objects.requireNonNull(function);
74         MethodType type = SharedUtils.inferMethodType(function, true);
75         if (!type.equals(target.type())) {
76             throw new IllegalArgumentException("Wrong method handle type: " + target.type());
77         }
78         return CallArranger.MACOS.arrangeUpcall(target, target.type(), function, scope);
79     }
80 
81     public static VaList newVaList(Consumer<VaList.Builder> actions, ResourceScope scope) {
82         MacOsAArch64VaList.Builder builder = MacOsAArch64VaList.builder(scope);
83         actions.accept(builder);
84         return builder.build();
85     }