authorgravatar for paul.verigo@gmail.comPavel Verigo <paul.verigo@gmail.com> 2025-04-27 15:36:24+02:00
committergravatar for alex@alexrp.comAlex Rønne Petersen <alex@alexrp.com> 2025-05-02 18:30:32+02:00
log331bd83f1115bf5e33b6b2d7651d67dcfe16ac2a
treecfb5b8ae47de4f0276c5c5f7ec4bf13f487da078
parent0209c68fcca22ffe1ab359096f6f3aeb477043e2
signaturebadge-check Signed by SSH key SHA256:7B/LJ7bpR1eX8aCXSr4mtd5M45VMPKcx9zY8e95b5QM

wasm-c-abi: llvm fix struct handling + reorganize

I changed to `wasm/abi.zig`, this design is certainly better than the previous one. Still there is some conflict of interest between llvm and self-hosted backend, better design will appear when abi tests will be tested with self-hosted. Resolves: #23304 Resolves: #23305

6 files changed, 329 insertions(+), 230 deletions(-)

src/arch/wasm/CodeGen.zig+69-72
......@@ -1398,11 +1398,22 @@ fn resolveCallingConventionValues(
13981398 },
13991399 .wasm_mvp => {
14001400 for (fn_info.param_types.get(ip)) |ty| {
1401 const ty_classes = abi.classifyType(Type.fromInterned(ty), zcu);
1402 for (ty_classes) |class| {
1403 if (class == .none) continue;
1404 try args.append(.{ .local = .{ .value = result.local_index, .references = 1 } });
1405 result.local_index += 1;
1401 if (!Type.fromInterned(ty).hasRuntimeBitsIgnoreComptime(zcu)) {
1402 continue;
1403 }
1404 switch (abi.classifyType(.fromInterned(ty), zcu)) {
1405 .direct => |scalar_ty| if (!abi.lowerAsDoubleI64(scalar_ty, zcu)) {
1406 try args.append(.{ .local = .{ .value = result.local_index, .references = 1 } });
1407 result.local_index += 1;
1408 } else {
1409 try args.append(.{ .local = .{ .value = result.local_index, .references = 1 } });
1410 try args.append(.{ .local = .{ .value = result.local_index + 1, .references = 1 } });
1411 result.local_index += 2;
1412 },
1413 .indirect => {
1414 try args.append(.{ .local = .{ .value = result.local_index, .references = 1 } });
1415 result.local_index += 1;
1416 },
14061417 }
14071418 }
14081419 },
......@@ -1418,14 +1429,13 @@ pub fn firstParamSRet(
14181429 zcu: *const Zcu,
14191430 target: *const std.Target,
14201431) bool {
1432 if (!return_type.hasRuntimeBitsIgnoreComptime(zcu)) return false;
14211433 switch (cc) {
14221434 .@"inline" => unreachable,
14231435 .auto => return isByRef(return_type, zcu, target),
1424 .wasm_mvp => {
1425 const ty_classes = abi.classifyType(return_type, zcu);
1426 if (ty_classes[0] == .indirect) return true;
1427 if (ty_classes[0] == .direct and ty_classes[1] == .direct) return true;
1428 return false;
1436 .wasm_mvp => switch (abi.classifyType(return_type, zcu)) {
1437 .direct => |scalar_ty| return abi.lowerAsDoubleI64(scalar_ty, zcu),
1438 .indirect => return true,
14291439 },
14301440 else => return false,
14311441 }
......@@ -1439,26 +1449,19 @@ fn lowerArg(cg: *CodeGen, cc: std.builtin.CallingConvention, ty: Type, value: WV
14391449 }
14401450
14411451 const zcu = cg.pt.zcu;
1442 const ty_classes = abi.classifyType(ty, zcu);
1443 assert(ty_classes[0] != .none);
1444 switch (ty.zigTypeTag(zcu)) {
1445 .@"struct", .@"union" => {
1446 if (ty_classes[0] == .indirect) {
1447 return cg.lowerToStack(value);
1448 }
1449 assert(ty_classes[0] == .direct);
1450 const scalar_type = abi.scalarType(ty, zcu);
1451 switch (value) {
1452 .nav_ref, .stack_offset => _ = try cg.load(value, scalar_type, 0),
1453 .dead => unreachable,
1454 else => try cg.emitWValue(value),
1455 }
1456 },
1457 .int, .float => {
1458 if (ty_classes[1] == .none) {
1452
1453 switch (abi.classifyType(ty, zcu)) {
1454 .direct => |scalar_type| if (!abi.lowerAsDoubleI64(scalar_type, zcu)) {
1455 if (!isByRef(ty, zcu, cg.target)) {
14591456 return cg.lowerToStack(value);
1457 } else {
1458 switch (value) {
1459 .nav_ref, .stack_offset => _ = try cg.load(value, scalar_type, 0),
1460 .dead => unreachable,
1461 else => try cg.emitWValue(value),
1462 }
14601463 }
1461 assert(ty_classes[0] == .direct and ty_classes[1] == .direct);
1464 } else {
14621465 assert(ty.abiSize(zcu) == 16);
14631466 // in this case we have an integer or float that must be lowered as 2 i64's.
14641467 try cg.emitWValue(value);
......@@ -1466,7 +1469,7 @@ fn lowerArg(cg: *CodeGen, cc: std.builtin.CallingConvention, ty: Type, value: WV
14661469 try cg.emitWValue(value);
14671470 try cg.addMemArg(.i64_load, .{ .offset = value.offset() + 8, .alignment = 8 });
14681471 },
1469 else => return cg.lowerToStack(value),
1472 .indirect => return cg.lowerToStack(value),
14701473 }
14711474}
14721475
......@@ -2125,23 +2128,16 @@ fn airRet(cg: *CodeGen, inst: Air.Inst.Index) InnerError!void {
21252128 if (cg.return_value != .none) {
21262129 try cg.store(cg.return_value, operand, ret_ty, 0);
21272130 } else if (fn_info.cc == .wasm_mvp and ret_ty.hasRuntimeBitsIgnoreComptime(zcu)) {
2128 switch (ret_ty.zigTypeTag(zcu)) {
2129 // Aggregate types can be lowered as a singular value
2130 .@"struct", .@"union" => {
2131 const scalar_type = abi.scalarType(ret_ty, zcu);
2132 try cg.emitWValue(operand);
2133 const opcode = buildOpcode(.{
2134 .op = .load,
2135 .width = @as(u8, @intCast(scalar_type.abiSize(zcu) * 8)),
2136 .signedness = if (scalar_type.isSignedInt(zcu)) .signed else .unsigned,
2137 .valtype1 = typeToValtype(scalar_type, zcu, cg.target),
2138 });
2139 try cg.addMemArg(Mir.Inst.Tag.fromOpcode(opcode), .{
2140 .offset = operand.offset(),
2141 .alignment = @intCast(scalar_type.abiAlignment(zcu).toByteUnits().?),
2142 });
2131 switch (abi.classifyType(ret_ty, zcu)) {
2132 .direct => |scalar_type| {
2133 assert(!abi.lowerAsDoubleI64(scalar_type, zcu));
2134 if (!isByRef(ret_ty, zcu, cg.target)) {
2135 try cg.emitWValue(operand);
2136 } else {
2137 _ = try cg.load(operand, scalar_type, 0);
2138 }
21432139 },
2144 else => try cg.emitWValue(operand),
2140 .indirect => unreachable,
21452141 }
21462142 } else {
21472143 if (!ret_ty.hasRuntimeBitsIgnoreComptime(zcu) and ret_ty.isError(zcu)) {
......@@ -2267,14 +2263,24 @@ fn airCall(cg: *CodeGen, inst: Air.Inst.Index, modifier: std.builtin.CallModifie
22672263 break :result_value .none;
22682264 } else if (first_param_sret) {
22692265 break :result_value sret;
2270 // TODO: Make this less fragile and optimize
2271 } else if (zcu.typeToFunc(fn_ty).?.cc == .wasm_mvp and ret_ty.zigTypeTag(zcu) == .@"struct" or ret_ty.zigTypeTag(zcu) == .@"union") {
2272 const result_local = try cg.allocLocal(ret_ty);
2273 try cg.addLocal(.local_set, result_local.local.value);
2274 const scalar_type = abi.scalarType(ret_ty, zcu);
2275 const result = try cg.allocStack(scalar_type);
2276 try cg.store(result, result_local, scalar_type, 0);
2277 break :result_value result;
2266 } else if (zcu.typeToFunc(fn_ty).?.cc == .wasm_mvp) {
2267 switch (abi.classifyType(ret_ty, zcu)) {
2268 .direct => |scalar_type| {
2269 assert(!abi.lowerAsDoubleI64(scalar_type, zcu));
2270 if (!isByRef(ret_ty, zcu, cg.target)) {
2271 const result_local = try cg.allocLocal(ret_ty);
2272 try cg.addLocal(.local_set, result_local.local.value);
2273 break :result_value result_local;
2274 } else {
2275 const result_local = try cg.allocLocal(ret_ty);
2276 try cg.addLocal(.local_set, result_local.local.value);
2277 const result = try cg.allocStack(ret_ty);
2278 try cg.store(result, result_local, scalar_type, 0);
2279 break :result_value result;
2280 }
2281 },
2282 .indirect => unreachable,
2283 }
22782284 } else {
22792285 const result_local = try cg.allocLocal(ret_ty);
22802286 try cg.addLocal(.local_set, result_local.local.value);
......@@ -2547,26 +2553,17 @@ fn airArg(cg: *CodeGen, inst: Air.Inst.Index) InnerError!void {
25472553 const cc = zcu.typeToFunc(zcu.navValue(cg.owner_nav).typeOf(zcu)).?.cc;
25482554 const arg_ty = cg.typeOfIndex(inst);
25492555 if (cc == .wasm_mvp) {
2550 const arg_classes = abi.classifyType(arg_ty, zcu);
2551 for (arg_classes) |class| {
2552 if (class != .none) {
2556 switch (abi.classifyType(arg_ty, zcu)) {
2557 .direct => |scalar_ty| if (!abi.lowerAsDoubleI64(scalar_ty, zcu)) {
25532558 cg.arg_index += 1;
2554 }
2555 }
2556
2557 // When we have an argument that's passed using more than a single parameter,
2558 // we combine them into a single stack value
2559 if (arg_classes[0] == .direct and arg_classes[1] == .direct) {
2560 if (arg_ty.zigTypeTag(zcu) != .int and arg_ty.zigTypeTag(zcu) != .float) {
2561 return cg.fail(
2562 "TODO: Implement C-ABI argument for type '{}'",
2563 .{arg_ty.fmt(pt)},
2564 );
2565 }
2566 const result = try cg.allocStack(arg_ty);
2567 try cg.store(result, arg, Type.u64, 0);
2568 try cg.store(result, cg.args[arg_index + 1], Type.u64, 8);
2569 return cg.finishAir(inst, result, &.{});
2559 } else {
2560 cg.arg_index += 2;
2561 const result = try cg.allocStack(arg_ty);
2562 try cg.store(result, arg, Type.u64, 0);
2563 try cg.store(result, cg.args[arg_index + 1], Type.u64, 8);
2564 return cg.finishAir(inst, result, &.{});
2565 },
2566 .indirect => cg.arg_index += 1,
25702567 }
25712568 } else {
25722569 cg.arg_index += 1;
src/arch/wasm/abi.zig+26-67
......@@ -13,70 +13,55 @@ const Zcu = @import("../../Zcu.zig");
1313
1414/// Defines how to pass a type as part of a function signature,
1515/// both for parameters as well as return values.
16pub const Class = enum { direct, indirect, none };
17
18const none: [2]Class = .{ .none, .none };
19const memory: [2]Class = .{ .indirect, .none };
20const direct: [2]Class = .{ .direct, .none };
16pub const Class = union(enum) {
17 direct: Type,
18 indirect,
19};
2120
2221/// Classifies a given Zig type to determine how they must be passed
2322/// or returned as value within a wasm function.
24/// When all elements result in `.none`, no value must be passed in or returned.
25pub fn classifyType(ty: Type, zcu: *const Zcu) [2]Class {
23pub fn classifyType(ty: Type, zcu: *const Zcu) Class {
2624 const ip = &zcu.intern_pool;
27 const target = zcu.getTarget();
28 if (!ty.hasRuntimeBitsIgnoreComptime(zcu)) return none;
25 assert(ty.hasRuntimeBitsIgnoreComptime(zcu));
2926 switch (ty.zigTypeTag(zcu)) {
27 .int, .@"enum", .error_set => return .{ .direct = ty },
28 .float => return .{ .direct = ty },
29 .bool => return .{ .direct = ty },
30 .vector => return .{ .direct = ty },
31 .array => return .indirect,
32 .optional => {
33 assert(ty.isPtrLikeOptional(zcu));
34 return .{ .direct = ty };
35 },
36 .pointer => {
37 assert(!ty.isSlice(zcu));
38 return .{ .direct = ty };
39 },
3040 .@"struct" => {
3141 const struct_type = zcu.typeToStruct(ty).?;
3242 if (struct_type.layout == .@"packed") {
33 if (ty.bitSize(zcu) <= 64) return direct;
34 return .{ .direct, .direct };
43 return .{ .direct = ty };
3544 }
3645 if (struct_type.field_types.len > 1) {
3746 // The struct type is non-scalar.
38 return memory;
47 return .indirect;
3948 }
4049 const field_ty = Type.fromInterned(struct_type.field_types.get(ip)[0]);
4150 const explicit_align = struct_type.fieldAlign(ip, 0);
4251 if (explicit_align != .none) {
4352 if (explicit_align.compareStrict(.gt, field_ty.abiAlignment(zcu)))
44 return memory;
53 return .indirect;
4554 }
4655 return classifyType(field_ty, zcu);
4756 },
48 .int, .@"enum", .error_set => {
49 const int_bits = ty.intInfo(zcu).bits;
50 if (int_bits <= 64) return direct;
51 if (int_bits <= 128) return .{ .direct, .direct };
52 return memory;
53 },
54 .float => {
55 const float_bits = ty.floatBits(target);
56 if (float_bits <= 64) return direct;
57 if (float_bits <= 128) return .{ .direct, .direct };
58 return memory;
59 },
60 .bool => return direct,
61 .vector => return direct,
62 .array => return memory,
63 .optional => {
64 assert(ty.isPtrLikeOptional(zcu));
65 return direct;
66 },
67 .pointer => {
68 assert(!ty.isSlice(zcu));
69 return direct;
70 },
7157 .@"union" => {
7258 const union_obj = zcu.typeToUnion(ty).?;
7359 if (union_obj.flagsUnordered(ip).layout == .@"packed") {
74 if (ty.bitSize(zcu) <= 64) return direct;
75 return .{ .direct, .direct };
60 return .{ .direct = ty };
7661 }
7762 const layout = ty.unionGetLayout(zcu);
7863 assert(layout.tag_size == 0);
79 if (union_obj.field_types.len > 1) return memory;
64 if (union_obj.field_types.len > 1) return .indirect;
8065 const first_field_ty = Type.fromInterned(union_obj.field_types.get(ip)[0]);
8166 return classifyType(first_field_ty, zcu);
8267 },
......@@ -97,32 +82,6 @@ pub fn classifyType(ty: Type, zcu: *const Zcu) [2]Class {
9782 }
9883}
9984
100/// Returns the scalar type a given type can represent.
101/// Asserts given type can be represented as scalar, such as
102/// a struct with a single scalar field.
103pub fn scalarType(ty: Type, zcu: *Zcu) Type {
104 const ip = &zcu.intern_pool;
105 switch (ty.zigTypeTag(zcu)) {
106 .@"struct" => {
107 if (zcu.typeToPackedStruct(ty)) |packed_struct| {
108 return scalarType(Type.fromInterned(packed_struct.backingIntTypeUnordered(ip)), zcu);
109 } else {
110 assert(ty.structFieldCount(zcu) == 1);
111 return scalarType(ty.fieldType(0, zcu), zcu);
112 }
113 },
114 .@"union" => {
115 const union_obj = zcu.typeToUnion(ty).?;
116 if (union_obj.flagsUnordered(ip).layout != .@"packed") {
117 const layout = Type.getUnionLayout(union_obj, zcu);
118 if (layout.payload_size == 0 and layout.tag_size != 0) {
119 return scalarType(ty.unionTagTypeSafety(zcu).?, zcu);
120 }
121 assert(union_obj.field_types.len == 1);
122 }
123 const first_field_ty = Type.fromInterned(union_obj.field_types.get(ip)[0]);
124 return scalarType(first_field_ty, zcu);
125 },
126 else => return ty,
127 }
85pub fn lowerAsDoubleI64(scalar_ty: Type, zcu: *const Zcu) bool {
86 return scalar_ty.bitSize(zcu) > 64;
12887}
src/codegen/llvm.zig+25-23
......@@ -12094,7 +12094,7 @@ fn firstParamSRet(fn_info: InternPool.Key.FuncType, zcu: *Zcu, target: std.Targe
1209412094 .x86_64_win => x86_64_abi.classifyWindows(return_type, zcu) == .memory,
1209512095 .x86_sysv, .x86_win => isByRef(return_type, zcu),
1209612096 .x86_stdcall => !isScalar(zcu, return_type),
12097 .wasm_mvp => wasm_c_abi.classifyType(return_type, zcu)[0] == .indirect,
12097 .wasm_mvp => wasm_c_abi.classifyType(return_type, zcu) == .indirect,
1209812098 .aarch64_aapcs,
1209912099 .aarch64_aapcs_darwin,
1210012100 .aarch64_aapcs_win,
......@@ -12179,18 +12179,9 @@ fn lowerFnRetTy(o: *Object, fn_info: InternPool.Key.FuncType) Allocator.Error!Bu
1217912179 return o.builder.structType(.normal, types[0..types_len]);
1218012180 },
1218112181 },
12182 .wasm_mvp => {
12183 if (isScalar(zcu, return_type)) {
12184 return o.lowerType(return_type);
12185 }
12186 const classes = wasm_c_abi.classifyType(return_type, zcu);
12187 if (classes[0] == .indirect or classes[0] == .none) {
12188 return .void;
12189 }
12190
12191 assert(classes[0] == .direct and classes[1] == .none);
12192 const scalar_type = wasm_c_abi.scalarType(return_type, zcu);
12193 return o.builder.intType(@intCast(scalar_type.abiSize(zcu) * 8));
12182 .wasm_mvp => switch (wasm_c_abi.classifyType(return_type, zcu)) {
12183 .direct => |scalar_ty| return o.lowerType(scalar_ty),
12184 .indirect => return .void,
1219412185 },
1219512186 // TODO investigate other callconvs
1219612187 else => return o.lowerType(return_type),
......@@ -12444,17 +12435,28 @@ const ParamTypeIterator = struct {
1244412435 },
1244512436 }
1244612437 },
12447 .wasm_mvp => {
12448 it.zig_index += 1;
12449 it.llvm_index += 1;
12450 if (isScalar(zcu, ty)) {
12451 return .byval;
12452 }
12453 const classes = wasm_c_abi.classifyType(ty, zcu);
12454 if (classes[0] == .indirect) {
12438 .wasm_mvp => switch (wasm_c_abi.classifyType(ty, zcu)) {
12439 .direct => |scalar_ty| {
12440 if (isScalar(zcu, ty)) {
12441 it.zig_index += 1;
12442 it.llvm_index += 1;
12443 return .byval;
12444 } else {
12445 var types_buffer: [8]Builder.Type = undefined;
12446 types_buffer[0] = try it.object.lowerType(scalar_ty);
12447 it.types_buffer = types_buffer;
12448 it.types_len = 1;
12449 it.llvm_index += 1;
12450 it.zig_index += 1;
12451 return .multiple_llvm_types;
12452 }
12453 },
12454 .indirect => {
12455 it.zig_index += 1;
12456 it.llvm_index += 1;
12457 it.byval_attr = true;
1245512458 return .byref;
12456 }
12457 return .abi_sized_int;
12459 },
1245812460 },
1245912461 // TODO investigate other callconvs
1246012462 else => {
src/link/Wasm.zig+17-16
......@@ -4617,10 +4617,13 @@ fn convertZcuFnType(
46174617 try params_buffer.append(gpa, .i32); // memory address is always a 32-bit handle
46184618 } else if (return_type.hasRuntimeBitsIgnoreComptime(zcu)) {
46194619 if (cc == .wasm_mvp) {
4620 const res_classes = abi.classifyType(return_type, zcu);
4621 assert(res_classes[0] == .direct and res_classes[1] == .none);
4622 const scalar_type = abi.scalarType(return_type, zcu);
4623 try returns_buffer.append(gpa, CodeGen.typeToValtype(scalar_type, zcu, target));
4620 switch (abi.classifyType(return_type, zcu)) {
4621 .direct => |scalar_ty| {
4622 assert(!abi.lowerAsDoubleI64(scalar_ty, zcu));
4623 try returns_buffer.append(gpa, CodeGen.typeToValtype(scalar_ty, zcu, target));
4624 },
4625 .indirect => unreachable,
4626 }
46244627 } else {
46254628 try returns_buffer.append(gpa, CodeGen.typeToValtype(return_type, zcu, target));
46264629 }
......@@ -4635,18 +4638,16 @@ fn convertZcuFnType(
46354638
46364639 switch (cc) {
46374640 .wasm_mvp => {
4638 const param_classes = abi.classifyType(param_type, zcu);
4639 if (param_classes[1] == .none) {
4640 if (param_classes[0] == .direct) {
4641 const scalar_type = abi.scalarType(param_type, zcu);
4642 try params_buffer.append(gpa, CodeGen.typeToValtype(scalar_type, zcu, target));
4643 } else {
4644 try params_buffer.append(gpa, CodeGen.typeToValtype(param_type, zcu, target));
4645 }
4646 } else {
4647 // i128/f128
4648 try params_buffer.append(gpa, .i64);
4649 try params_buffer.append(gpa, .i64);
4641 switch (abi.classifyType(param_type, zcu)) {
4642 .direct => |scalar_ty| {
4643 if (!abi.lowerAsDoubleI64(scalar_ty, zcu)) {
4644 try params_buffer.append(gpa, CodeGen.typeToValtype(scalar_ty, zcu, target));
4645 } else {
4646 try params_buffer.append(gpa, .i64);
4647 try params_buffer.append(gpa, .i64);
4648 }
4649 },
4650 .indirect => try params_buffer.append(gpa, CodeGen.typeToValtype(param_type, zcu, target)),
46504651 }
46514652 },
46524653 else => try params_buffer.append(gpa, CodeGen.typeToValtype(param_type, zcu, target)),
test/c_abi/cfuncs.c+70
......@@ -227,6 +227,38 @@ void c_struct_u64_u64_8(size_t, size_t, size_t, size_t, size_t, size_t, size_t,
227227 assert_or_panic(s.b == 40);
228228}
229229
230struct Struct_f32 {
231 float a;
232};
233
234struct Struct_f32 zig_ret_struct_f32(void);
235
236void zig_struct_f32(struct Struct_f32);
237
238struct Struct_f32 c_ret_struct_f32(void) {
239 return (struct Struct_f32){ 2.5f };
240}
241
242void c_struct_f32(struct Struct_f32 s) {
243 assert_or_panic(s.a == 2.5f);
244}
245
246struct Struct_f64 {
247 double a;
248};
249
250struct Struct_f64 zig_ret_struct_f64(void);
251
252void zig_struct_f64(struct Struct_f64);
253
254struct Struct_f64 c_ret_struct_f64(void) {
255 return (struct Struct_f64){ 2.5 };
256}
257
258void c_struct_f64(struct Struct_f64 s) {
259 assert_or_panic(s.a == 2.5);
260}
261
230262struct Struct_f32f32_f32 {
231263 struct {
232264 float b, c;
......@@ -296,6 +328,13 @@ void c_struct_u32_union_u32_u32u32(struct Struct_u32_Union_u32_u32u32 s) {
296328 assert_or_panic(s.b.c.e == 3);
297329}
298330
331struct Struct_i32_i32 {
332 int32_t a;
333 int32_t b;
334};
335
336void zig_struct_i32_i32(struct Struct_i32_i32);
337
299338struct BigStruct {
300339 uint64_t a;
301340 uint64_t b;
......@@ -2674,6 +2713,18 @@ void run_c_tests(void) {
26742713 }
26752714
26762715#if !defined(ZIG_RISCV64)
2716 {
2717 struct Struct_f32 s = zig_ret_struct_f32();
2718 assert_or_panic(s.a == 2.5f);
2719 zig_struct_f32((struct Struct_f32){ 2.5f });
2720 }
2721
2722 {
2723 struct Struct_f64 s = zig_ret_struct_f64();
2724 assert_or_panic(s.a == 2.5);
2725 zig_struct_f64((struct Struct_f64){ 2.5 });
2726 }
2727
26772728 {
26782729 struct Struct_f32f32_f32 s = zig_ret_struct_f32f32_f32();
26792730 assert_or_panic(s.a.b == 1.0f);
......@@ -2699,6 +2750,10 @@ void run_c_tests(void) {
26992750 assert_or_panic(s.b.c.e == 3);
27002751 zig_struct_u32_union_u32_u32u32(s);
27012752 }
2753 {
2754 struct Struct_i32_i32 s = {1, 2};
2755 zig_struct_i32_i32(s);
2756 }
27022757#endif
27032758
27042759 {
......@@ -5024,6 +5079,21 @@ double complex c_cmultd(double complex a, double complex b) {
50245079 return 1.5 + I * 13.5;
50255080}
50265081
5082struct Struct_i32_i32 c_mut_struct_i32_i32(struct Struct_i32_i32 s) {
5083 assert_or_panic(s.a == 1);
5084 assert_or_panic(s.b == 2);
5085 s.a += 100;
5086 s.b += 250;
5087 assert_or_panic(s.a == 101);
5088 assert_or_panic(s.b == 252);
5089 return s;
5090}
5091
5092void c_struct_i32_i32(struct Struct_i32_i32 s) {
5093 assert_or_panic(s.a == 1);
5094 assert_or_panic(s.b == 2);
5095}
5096
50275097void c_big_struct(struct BigStruct x) {
50285098 assert_or_panic(x.a == 1);
50295099 assert_or_panic(x.b == 2);
test/c_abi/main.zig+122-52
......@@ -13,7 +13,7 @@ const expectEqual = std.testing.expectEqual;
1313const have_i128 = builtin.cpu.arch != .x86 and !builtin.cpu.arch.isArm() and
1414 !builtin.cpu.arch.isMIPS() and !builtin.cpu.arch.isPowerPC32();
1515
16const have_f128 = builtin.cpu.arch.isX86() and !builtin.os.tag.isDarwin();
16const have_f128 = builtin.cpu.arch.isWasm() or (builtin.cpu.arch.isX86() and !builtin.os.tag.isDarwin());
1717const have_f80 = builtin.cpu.arch.isX86();
1818
1919extern fn run_c_tests() void;
......@@ -339,6 +339,56 @@ test "C ABI struct u64 u64" {
339339 c_struct_u64_u64_8(0, 1, 2, 3, 4, 5, 6, 7, .{ .a = 39, .b = 40 });
340340}
341341
342const Struct_f32 = extern struct {
343 a: f32,
344};
345
346export fn zig_ret_struct_f32() Struct_f32 {
347 return .{ .a = 2.5 };
348}
349
350export fn zig_struct_f32(s: Struct_f32) void {
351 expect(s.a == 2.5) catch @panic("test failure");
352}
353
354extern fn c_ret_struct_f32() Struct_f32;
355
356extern fn c_struct_f32(Struct_f32) void;
357
358test "C ABI struct f32" {
359 if (builtin.cpu.arch.isMIPS64()) return error.SkipZigTest;
360 if (builtin.cpu.arch.isPowerPC32()) return error.SkipZigTest;
361
362 const s = c_ret_struct_f32();
363 try expect(s.a == 2.5);
364 c_struct_f32(.{ .a = 2.5 });
365}
366
367const Struct_f64 = extern struct {
368 a: f64,
369};
370
371export fn zig_ret_struct_f64() Struct_f64 {
372 return .{ .a = 2.5 };
373}
374
375export fn zig_struct_f64(s: Struct_f64) void {
376 expect(s.a == 2.5) catch @panic("test failure");
377}
378
379extern fn c_ret_struct_f64() Struct_f64;
380
381extern fn c_struct_f64(Struct_f64) void;
382
383test "C ABI struct f64" {
384 if (builtin.cpu.arch.isMIPS64()) return error.SkipZigTest;
385 if (builtin.cpu.arch.isPowerPC32()) return error.SkipZigTest;
386
387 const s = c_ret_struct_f64();
388 try expect(s.a == 2.5);
389 c_struct_f64(.{ .a = 2.5 });
390}
391
342392const Struct_f32f32_f32 = extern struct {
343393 a: extern struct { b: f32, c: f32 },
344394 d: f32,
......@@ -434,6 +484,34 @@ test "C ABI struct{u32,union{u32,struct{u32,u32}}}" {
434484 c_struct_u32_union_u32_u32u32(.{ .a = 1, .b = .{ .c = .{ .d = 2, .e = 3 } } });
435485}
436486
487const Struct_i32_i32 = extern struct {
488 a: i32,
489 b: i32,
490};
491extern fn c_mut_struct_i32_i32(Struct_i32_i32) Struct_i32_i32;
492extern fn c_struct_i32_i32(Struct_i32_i32) void;
493
494test "C ABI struct i32 i32" {
495 if (builtin.cpu.arch.isMIPS64()) return error.SkipZigTest;
496 if (builtin.cpu.arch.isPowerPC()) return error.SkipZigTest;
497
498 const s: Struct_i32_i32 = .{
499 .a = 1,
500 .b = 2,
501 };
502 const mut_res = c_mut_struct_i32_i32(s);
503 try expect(s.a == 1);
504 try expect(s.b == 2);
505 try expect(mut_res.a == 101);
506 try expect(mut_res.b == 252);
507 c_struct_i32_i32(s);
508}
509
510export fn zig_struct_i32_i32(s: Struct_i32_i32) void {
511 expect(s.a == 1) catch @panic("test failure: zig_struct_i32_i32 1");
512 expect(s.b == 2) catch @panic("test failure: zig_struct_i32_i32 2");
513}
514
437515const BigStruct = extern struct {
438516 a: u64,
439517 b: u64,
......@@ -5591,64 +5669,56 @@ test "f80 extra struct" {
55915669 try expect(a.b == 24);
55925670}
55935671
5594comptime {
5595 skip: {
5596 if (builtin.target.cpu.arch.isWasm()) break :skip;
5597
5598 _ = struct {
5599 export fn zig_f128(x: f128) f128 {
5600 expect(x == 12) catch @panic("test failure");
5601 return 34;
5602 }
5603 extern fn c_f128(f128) f128;
5604 test "f128 bare" {
5605 if (!have_f128) return error.SkipZigTest;
5672export fn zig_f128(x: f128) f128 {
5673 expect(x == 12) catch @panic("test failure");
5674 return 34;
5675}
5676extern fn c_f128(f128) f128;
5677test "f128 bare" {
5678 if (!have_f128) return error.SkipZigTest;
56065679
5607 const a = c_f128(12.34);
5608 try expect(@as(f64, @floatCast(a)) == 56.78);
5609 }
5680 const a = c_f128(12.34);
5681 try expect(@as(f64, @floatCast(a)) == 56.78);
5682}
56105683
5611 const f128_struct = extern struct {
5612 a: f128,
5613 };
5614 export fn zig_f128_struct(a: f128_struct) f128_struct {
5615 expect(a.a == 12345) catch @panic("test failure");
5616 return .{ .a = 98765 };
5617 }
5618 extern fn c_f128_struct(f128_struct) f128_struct;
5619 test "f128 struct" {
5620 if (!have_f128) return error.SkipZigTest;
5684const f128_struct = extern struct {
5685 a: f128,
5686};
5687export fn zig_f128_struct(a: f128_struct) f128_struct {
5688 expect(a.a == 12345) catch @panic("test failure");
5689 return .{ .a = 98765 };
5690}
5691extern fn c_f128_struct(f128_struct) f128_struct;
5692test "f128 struct" {
5693 if (!have_f128) return error.SkipZigTest;
56215694
5622 const a = c_f128_struct(.{ .a = 12.34 });
5623 try expect(@as(f64, @floatCast(a.a)) == 56.78);
5695 const a = c_f128_struct(.{ .a = 12.34 });
5696 try expect(@as(f64, @floatCast(a.a)) == 56.78);
56245697
5625 const b = c_f128_f128_struct(.{ .a = 12.34, .b = 87.65 });
5626 try expect(@as(f64, @floatCast(b.a)) == 56.78);
5627 try expect(@as(f64, @floatCast(b.b)) == 43.21);
5628 }
5698 const b = c_f128_f128_struct(.{ .a = 12.34, .b = 87.65 });
5699 try expect(@as(f64, @floatCast(b.a)) == 56.78);
5700 try expect(@as(f64, @floatCast(b.b)) == 43.21);
5701}
56295702
5630 const f128_f128_struct = extern struct {
5631 a: f128,
5632 b: f128,
5633 };
5634 export fn zig_f128_f128_struct(a: f128_f128_struct) f128_f128_struct {
5635 expect(a.a == 13) catch @panic("test failure");
5636 expect(a.b == 57) catch @panic("test failure");
5637 return .{ .a = 24, .b = 68 };
5638 }
5639 extern fn c_f128_f128_struct(f128_f128_struct) f128_f128_struct;
5640 test "f128 f128 struct" {
5641 if (!have_f128) return error.SkipZigTest;
5703const f128_f128_struct = extern struct {
5704 a: f128,
5705 b: f128,
5706};
5707export fn zig_f128_f128_struct(a: f128_f128_struct) f128_f128_struct {
5708 expect(a.a == 13) catch @panic("test failure");
5709 expect(a.b == 57) catch @panic("test failure");
5710 return .{ .a = 24, .b = 68 };
5711}
5712extern fn c_f128_f128_struct(f128_f128_struct) f128_f128_struct;
5713test "f128 f128 struct" {
5714 if (!have_f128) return error.SkipZigTest;
56425715
5643 const a = c_f128_struct(.{ .a = 12.34 });
5644 try expect(@as(f64, @floatCast(a.a)) == 56.78);
5716 const a = c_f128_struct(.{ .a = 12.34 });
5717 try expect(@as(f64, @floatCast(a.a)) == 56.78);
56455718
5646 const b = c_f128_f128_struct(.{ .a = 12.34, .b = 87.65 });
5647 try expect(@as(f64, @floatCast(b.a)) == 56.78);
5648 try expect(@as(f64, @floatCast(b.b)) == 43.21);
5649 }
5650 };
5651 }
5719 const b = c_f128_f128_struct(.{ .a = 12.34, .b = 87.65 });
5720 try expect(@as(f64, @floatCast(b.a)) == 56.78);
5721 try expect(@as(f64, @floatCast(b.b)) == 43.21);
56525722}
56535723
56545724// The stdcall attribute on C functions is ignored when compiled on non-x86