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Check for inactive union field when calling fn at comptime

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Reuse `unionFieldPtr` here to ensure that all the safety checks are
included.

Closes https://github.com/ziglang/zig/issues/18546.
This commit is contained in:
John Schmidt 2024-02-09 01:51:26 +01:00 • committed by Andrew Kelley
parent 3e79c0f18c
commit 7a045ede7c
2 changed files with 19 additions and 3 deletions
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6
src/Sema.zig
View file

@ -27200,10 +27200,10 @@ fn fieldCallBind(
.Union => {
try sema.resolveTypeFields(concrete_ty);
const union_obj = mod.typeToUnion(concrete_ty).?;
const field_index = union_obj.nameIndex(ip, field_name) orelse break :find_field;
const field_ty = Type.fromInterned(union_obj.field_types.get(ip)[field_index]);
_ = union_obj.nameIndex(ip, field_name) orelse break :find_field;
return sema.finishFieldCallBind(block, src, ptr_ty, field_ty, field_index, object_ptr);
const field_ptr = try unionFieldPtr(sema, block, src, object_ptr, field_name, field_name_src, concrete_ty, false);
return .{ .direct = try sema.analyzeLoad(block, src, field_ptr, src) };
},
.Type => {
const namespace = try sema.analyzeLoad(block, src, object_ptr, src);

16
test/cases/compile_errors/union_calling_inactive_field_as_fn.zig Normal file
View file

@ -0,0 +1,16 @@
const U = union(enum) {
int: isize,
float: f64,
};
export fn entry() void {
const f = U{ .int = 20 };
_ = f.float();
}
// error
// backend=stage2
// target=native
//
// :8:10: error: access of union field 'float' while field 'int' is active
// :1:11: note: union declared here