Commit 865d6df03e

LemonBoy <thatlemon@gmail.com>
2020-12-05 18:52:25
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.
master
1 parent b6b7a64
Changed files (1)
src
stage1
analyze.cpp
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;