| author |  Andrew Kelley <andrew@ziglang.org> 2023-07-26 19:49:16-07:00 |
| committer | Andrew Kelley <andrew@ziglang.org> 2023-07-27 00:49:25-07:00 |
| log | 0f21d3d4d1a5cbb5254dbf55304347f4d5c3e9c5 |
| tree | 4e0933b1300b0fe9fc8f005ab96b074901ad44d5 |
| parent | c3364b372f4fa67a681d599f1a7ddcd4c0154fd1 |
LLVM: always add argument attributes to calls
These are needed for correctness. There's no reason to only add them for
function pointers.
closes #162903 files changed, 74 insertions(+), 2 deletions(-)
src/codegen/llvm.zig+2-2
| ... | ... | @@ -5324,8 +5324,8 @@ pub const FuncGen = struct { |
| 5324 | 5324 | }, |
| 5325 | 5325 | }; |
| 5326 | 5326 | |
| 5327 | if (callee_ty.zigTypeTag(mod) == .Pointer) { | |
| 5328 | // Add argument attributes for function pointer calls. | |
| 5327 | { | |
| 5328 | // Add argument attributes. | |
| 5329 | 5329 | it = iterateParamTypes(o, fn_info); |
| 5330 | 5330 | it.llvm_index += @intFromBool(sret); |
| 5331 | 5331 | it.llvm_index += @intFromBool(err_return_tracing); |
test/c_abi/cfuncs.c+17
| ... | ... | @@ -1034,3 +1034,20 @@ struct ByRef __attribute__((sysv_abi)) c_explict_sys_v(struct ByRef in) { |
| 1034 | 1034 | return in; |
| 1035 | 1035 | } |
| 1036 | 1036 | #endif |
| 1037 | ||
| 1038 | ||
| 1039 | struct byval_tail_callsite_attr_Point { | |
| 1040 | double x; | |
| 1041 | double y; | |
| 1042 | } Point; | |
| 1043 | struct byval_tail_callsite_attr_Size { | |
| 1044 | double width; | |
| 1045 | double height; | |
| 1046 | } Size; | |
| 1047 | struct byval_tail_callsite_attr_Rect { | |
| 1048 | struct byval_tail_callsite_attr_Point origin; | |
| 1049 | struct byval_tail_callsite_attr_Size size; | |
| 1050 | }; | |
| 1051 | double c_byval_tail_callsite_attr(struct byval_tail_callsite_attr_Rect in) { | |
| 1052 | return in.size.width; | |
| 1053 | } |
test/c_abi/main.zig+55
| ... | ... | @@ -1216,3 +1216,58 @@ test "explicit Win64 calling convention" { |
| 1216 | 1216 | const res = c_explict_sys_v(.{ .val = 1, .arr = undefined }); |
| 1217 | 1217 | try expect(res.val == 42); |
| 1218 | 1218 | } |
| 1219 | ||
| 1220 | const byval_tail_callsite_attr = struct { | |
| 1221 | const struct_Point = extern struct { | |
| 1222 | x: f64, | |
| 1223 | y: f64, | |
| 1224 | }; | |
| 1225 | const struct_Size = extern struct { | |
| 1226 | width: f64, | |
| 1227 | height: f64, | |
| 1228 | }; | |
| 1229 | const struct_Rect = extern struct { | |
| 1230 | origin: struct_Point, | |
| 1231 | size: struct_Size, | |
| 1232 | }; | |
| 1233 | ||
| 1234 | const Point = extern struct { | |
| 1235 | x: f64, | |
| 1236 | y: f64, | |
| 1237 | }; | |
| 1238 | ||
| 1239 | const Size = extern struct { | |
| 1240 | width: f64, | |
| 1241 | height: f64, | |
| 1242 | }; | |
| 1243 | ||
| 1244 | const MyRect = extern struct { | |
| 1245 | origin: Point, | |
| 1246 | size: Size, | |
| 1247 | ||
| 1248 | fn run(self: MyRect) f64 { | |
| 1249 | return c_byval_tail_callsite_attr(cast(self)); | |
| 1250 | } | |
| 1251 | ||
| 1252 | fn cast(self: MyRect) struct_Rect { | |
| 1253 | return @bitCast(self); | |
| 1254 | } | |
| 1255 | ||
| 1256 | extern fn c_byval_tail_callsite_attr(struct_Rect) f64; | |
| 1257 | }; | |
| 1258 | }; | |
| 1259 | ||
| 1260 | test "byval tail callsite attribute" { | |
| 1261 | if (comptime builtin.cpu.arch.isMIPS()) return error.SkipZigTest; | |
| 1262 | if (comptime builtin.cpu.arch.isPPC()) return error.SkipZigTest; | |
| 1263 | ||
| 1264 | // Originally reported at https://github.com/ziglang/zig/issues/16290 | |
| 1265 | // the bug was that the extern function had the byval attribute, but | |
| 1266 | // zig did not put the byval attribute at the callsite. Some LLVM optimization | |
| 1267 | // passes would then pass undefined for that parameter. | |
| 1268 | var v: byval_tail_callsite_attr.MyRect = .{ | |
| 1269 | .origin = .{ .x = 1, .y = 2 }, | |
| 1270 | .size = .{ .width = 3, .height = 4 }, | |
| 1271 | }; | |
| 1272 | try expect(v.run() == 3.0); | |
| 1273 | } |