From 018cbff438cedc19d0ad18021619ec7ede997307 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Wed, 15 Nov 2017 22:52:47 -0500
Subject: unions have a secret field for the type

See #144
---
 src/all_types.hpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/all_types.hpp')

diff --git a/src/all_types.hpp b/src/all_types.hpp
index ca6c214af8..a6a3f4e1e5 100644
--- a/src/all_types.hpp
+++ b/src/all_types.hpp
@@ -1037,6 +1037,9 @@ struct TypeTableEntryEnumTag {
     LLVMValueRef name_table;
 };
 
+uint32_t type_ptr_hash(const TypeTableEntry *ptr);
+bool type_ptr_eql(const TypeTableEntry *a, const TypeTableEntry *b);
+
 struct TypeTableEntryUnion {
     AstNode *decl_node;
     ContainerLayout layout;
@@ -1044,6 +1047,8 @@ struct TypeTableEntryUnion {
     uint32_t gen_field_count;
     TypeUnionField *fields;
     bool is_invalid; // true if any fields are invalid
+    TypeTableEntry *tag_type;
+    LLVMTypeRef union_type_ref;
 
     ScopeDecls *decls_scope;
 
@@ -1057,8 +1062,13 @@ struct TypeTableEntryUnion {
     bool zero_bits_known;
     uint32_t abi_alignment; // also figured out with zero_bits pass
 
-    uint32_t size_bytes;
+    size_t gen_union_index;
+    size_t gen_tag_index;
+
+    uint32_t union_size_bytes;
     TypeTableEntry *most_aligned_union_member;
+
+    HashMap<const TypeTableEntry *, uint32_t, type_ptr_hash, type_ptr_eql> distinct_types = {};
 };
 
 struct FnGenParamInfo {
-- 
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