zig

commit 865d6df03e20b3338bafb15c23bce6b5912ecf88 (tree)
parent b6b7a6401c064582b610b8ca6935a388c3bb3c03
Author: LemonBoy <thatlemon@gmail.com>
Date:   Sat,  5 Dec 2020 18:52:25 +0100

stage1: Fix constant folding of single-element enums

Fill in the correct value instead of leaving everything uninitialized.
This problem can be noticed in behavior/union.zig but it's masked by
some other "optimization" kicking in at the wrong time, the following
commits will address that.

Diffstat:
M
src/stage1/analyze.cpp
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/src/stage1/analyze.cpp b/src/stage1/analyze.cpp
@@ -6122,6 +6122,11 @@ ZigValue *get_the_one_possible_value(CodeGen *g, ZigType *type_entry) {
         result->data.x_ptr.mut = ConstPtrMutComptimeConst;
         result->data.x_ptr.special = ConstPtrSpecialRef;
         result->data.x_ptr.data.ref.pointee = get_the_one_possible_value(g, result->type->data.pointer.child_type);
+    } else if (result->type->id == ZigTypeIdEnum) {
+        ZigType *enum_type = result->type;
+        assert(enum_type->data.enumeration.src_field_count == 1);
+        TypeEnumField *only_field = &result->type->data.enumeration.fields[0];
+        bigint_init_bigint(&result->data.x_enum_tag, &only_field->value);
     }
     g->one_possible_values.put(type_entry, result);
     return result;