Try to fix call stack

ethanuppal · May 15, 2024 · 920d552 · 920d552
1 parent 5bc0725
commit 920d552
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diff --git a/README.md b/README.md
@@ -7,7 +7,7 @@
 ![CI Status](https://github.com/ethanuppal/cs3110_compiler/actions/workflows/ci.yaml/badge.svg)
 
 > "x86 is simple trust me bro"  
-> Last updated: 2024-05-15 00:08:30.197268
+> Last updated: 2024-05-15 00:23:21.691740
 
 ```
 $ ./main -h

diff --git a/lib/backend/asm_emit.ml b/lib/backend/asm_emit.ml
@@ -119,7 +119,11 @@ let emit_cfg ~text cfg regalloc =
        (Asm.Label.make ~is_global:true ~is_external:false
           (mangle (Cfg.name_of cfg))));
   Asm.Section.add_all text
-    [ Push (Register RBP); Mov (Register RBP, Register RSP) ];
+    [
+      Push (Register RBP);
+      Mov (Register RBP, Register RSP);
+      Sub (Register RSP, Intermediate (align_offset var_size));
+    ];
   (* restore is done at returns *)
   emit_save_registers text Asm.Register.callee_saved_data_registers;
   Cfg.blocks_of cfg |> List.iter (emit_bb text cfg regalloc)