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Sema: implement @export for arbitrary values

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mlugg 2023-03-04 13:21:11 +00:00 committed by Veikka Tuominen
parent 5e161c102d
commit f9b5829508
2 changed files with 36 additions and 1 deletions
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18
src/Sema.zig
View File

@ -5668,7 +5668,15 @@ fn zirExportValue(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
};
const decl_index = switch (operand.val.tag()) {
.function => operand.val.castTag(.function).?.data.owner_decl,
else => return sema.fail(block, operand_src, "TODO implement exporting arbitrary Value objects", .{}), // TODO put this Value into an anonymous Decl and then export it.
else => blk: {
var anon_decl = try block.startAnonDecl();
defer anon_decl.deinit();
break :blk try anon_decl.finish(
try operand.ty.copy(anon_decl.arena()),
try operand.val.copy(anon_decl.arena()),
0,
);
},
};
try sema.analyzeExport(block, src, options, decl_index);
}
@ -5704,6 +5712,14 @@ pub fn analyzeExport(
return sema.failWithOwnedErrorMsg(msg);
}
// TODO: some backends might support re-exporting extern decls
if (exported_decl.isExtern()) {
return sema.fail(block, src, "export target cannot be extern", .{});
}
// This decl is alive no matter what, since it's being exported
mod.markDeclAlive(exported_decl);
const gpa = mod.gpa;
try mod.decl_exports.ensureUnusedCapacity(gpa, 1);

19
test/behavior/export.zig
View File

@ -70,3 +70,22 @@ test "exporting using field access" {
_ = S.Inner.x;
}
test "exporting comptime-known value" {
const x: u32 = 10;
@export(x, .{ .name = "exporting_comptime_known_value_foo" });
const S = struct {
extern const exporting_comptime_known_value_foo: u32;
};
try expect(S.exporting_comptime_known_value_foo == 10);
}
test "exporting comptime var" {
comptime var x: u32 = 5;
@export(x, .{ .name = "exporting_comptime_var_foo" });
x = 7; // modifying this now shouldn't change anything
const S = struct {
extern const exporting_comptime_var_foo: u32;
};
try expect(S.exporting_comptime_var_foo == 5);
}