From fc16aefc7d85a8dcf2449f9e6a2642203df1278a Mon Sep 17 00:00:00 2001
From: slava <slava@factorcode.org>
Date: Mon, 3 Jul 2006 07:27:30 +0000
Subject: [PATCH] Add Mac OS X x86 ABI support

---
 library/compiler/x86/alien-macosx.factor | 68 ++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 library/compiler/x86/alien-macosx.factor

diff --git a/library/compiler/x86/alien-macosx.factor b/library/compiler/x86/alien-macosx.factor
new file mode 100644
index 0000000000..fbc8815146
--- /dev/null
+++ b/library/compiler/x86/alien-macosx.factor
@@ -0,0 +1,68 @@
+! Copyright (C) 2005, 2006 Slava Pestov.
+! See http://factorcode.org/license.txt for BSD license.
+IN: compiler
+USING: kernel kernel-internals math ;
+
+! OS X uses a different ABI. The stack must be 16-byte aligned.
+
+: align-sub ( n -- )
+    cells dup 16 align swap - ESP swap SUB ;
+
+: align-add ( n -- )
+    cells 16 align ESP swap ADD ;
+
+: with-aligned-stack ( n quot -- )
+    swap dup align-sub slip align-add ; inline
+
+: struct-ptr/size ( n size func -- )
+    EAX ESP MOV
+    >r >r EAX swap ADD r> r>
+    2 [
+        ! Push destination address
+        EAX PUSH
+        ! Push struct size
+        >r PUSH r>
+        ! Copy the struct to the stack
+        f compile-c-call
+    ] with-aligned-stack ;
+
+: %unbox-struct ( n size -- )
+    "unbox_value_struct" struct-ptr/size ;
+
+: %unbox ( n reg-class func -- )
+    ! Call the unboxer
+    f compile-c-call
+    ! Store the return value on the C stack
+    [ return-reg ] keep %freg>stack ;
+
+: %box-struct ( n size -- )
+    "box_value_struct" struct-ptr/size ;
+
+: %box ( n reg-class func -- )
+    1 [
+        >r over [
+            drop 12 + ESP swap [+] PUSH
+        ] [
+            push-return-reg drop
+        ] if r> f compile-c-call
+    ] with-aligned-stack ;
+
+: %alien-callback ( quot -- )
+    1 [
+        EAX load-indirect
+        EAX PUSH
+        "run_callback" f compile-c-call
+    ] with-aligned-stack ;
+
+: %callback-value ( reg-class func -- )
+    f compile-c-call ! Call the unboxer
+    ESP 12 ADD
+    ! Save return register
+    dup push-return-reg
+    ! Restore data/call/retain stacks
+    "unnest_stacks" f compile-c-call
+    ! Restore return register
+    pop-return-reg
+    ESP 12 SUB ;
+
+: %cleanup ( n -- ) drop ;