diff options
Diffstat (limited to 'src/llvm_backend_general.cpp')
| -rw-r--r-- | src/llvm_backend_general.cpp | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/src/llvm_backend_general.cpp b/src/llvm_backend_general.cpp index dd1555193..f6dd97966 100644 --- a/src/llvm_backend_general.cpp +++ b/src/llvm_backend_general.cpp @@ -1176,10 +1176,35 @@ void lb_emit_store_union_variant_tag(lbProcedure *p, lbValue parent, Type *varia } void lb_emit_store_union_variant(lbProcedure *p, lbValue parent, lbValue variant, Type *variant_type) { - lbValue underlying = lb_emit_conv(p, parent, alloc_type_pointer(variant_type)); + Type *pt = base_type(type_deref(parent.type)); + GB_ASSERT(pt->kind == Type_Union); + if (pt->Union.kind == UnionType_shared_nil) { + lbBlock *if_nil = lb_create_block(p, "shared_nil.if_nil"); + lbBlock *if_not_nil = lb_create_block(p, "shared_nil.if_not_nil"); + lbBlock *done = lb_create_block(p, "shared_nil.done"); + + lbValue cond_is_nil = lb_emit_comp_against_nil(p, Token_CmpEq, variant); + lb_emit_if(p, cond_is_nil, if_nil, if_not_nil); + + lb_start_block(p, if_nil); + lb_emit_store(p, parent, lb_const_nil(p->module, type_deref(parent.type))); + lb_emit_jump(p, done); + + lb_start_block(p, if_not_nil); + lbValue underlying = lb_emit_conv(p, parent, alloc_type_pointer(variant_type)); + lb_emit_store(p, underlying, variant); + lb_emit_store_union_variant_tag(p, parent, variant_type); + lb_emit_jump(p, done); + + lb_start_block(p, done); - lb_emit_store(p, underlying, variant); - lb_emit_store_union_variant_tag(p, parent, variant_type); + + } else { + lbValue underlying = lb_emit_conv(p, parent, alloc_type_pointer(variant_type)); + + lb_emit_store(p, underlying, variant); + lb_emit_store_union_variant_tag(p, parent, variant_type); + } } |