From 8b71df7ba8bcdd0ea45ed1b6205a957b69a4d268 Mon Sep 17 00:00:00 2001
From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Thu, 14 Oct 2021 22:46:53 -0500
Subject: [PATCH] sizeof and alignof are compile time known

---
 src/checker.c |  2 ++
 src/wasm.c    | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/checker.c b/src/checker.c
index 8b175999..91faf648 100644
--- a/src/checker.c
+++ b/src/checker.c
@@ -1474,6 +1474,7 @@ CheckStatus check_size_of(AstSizeOf* so) {
         YIELD(so->token->pos, "Trying to resolve type to take the size of.");
 
     so->size = type_size_of(so->so_type);
+    so->flags |= Ast_Flag_Comptime;
 
     return Check_Success;
 }
@@ -1486,6 +1487,7 @@ CheckStatus check_align_of(AstAlignOf* ao) {
         YIELD(ao->token->pos, "Trying to resolve type to take the alignment of.");
 
     ao->alignment = type_alignment_of(ao->ao_type);
+    ao->flags |= Ast_Flag_Comptime;
 
     return Check_Success;
 }
diff --git a/src/wasm.c b/src/wasm.c
index a2861317..796bc328 100644
--- a/src/wasm.c
+++ b/src/wasm.c
@@ -3386,6 +3386,18 @@ static b32 emit_raw_data_(OnyxWasmModule* mod, ptr data, AstTyped* node) {
         break;
     }
 
+    case Ast_Kind_Size_Of: {
+        AstSizeOf* so = (AstSizeOf *) node;
+        *((u32 *) data) = so->size;
+        break;
+    }
+
+    case Ast_Kind_Align_Of: {
+        AstAlignOf* ao = (AstAlignOf *) node;
+        *((u32 *) data) = ao->alignment;
+        break;
+    }
+
     case Ast_Kind_NumLit: {
         // NOTE: This makes a big assumption that we are running on a
         // little endian machine, since WebAssembly is little endian
-- 
2.25.1