moved %(un)nest-stacks out to cpu specific files to eliminate %vm-invoke from compiler.codegen

basis/compiler/codegen/codegen.factor

@@ -447,7 +447,7 @@ M: ##alien-indirect generate-insn
     ! Generate code for boxing input parameters in a callback.
     [
         dup \ %save-param-reg move-parameters
-        "nest_stacks" %vm-invoke-1st-arg
+        %nest-stacks
         box-parameters
     ] with-param-regs ;
 
@@ -485,8 +485,6 @@ TUPLE: callback-context ;
         [ callback-context new do-callback ] %
     ] [ ] make ;
 
-: %unnest-stacks ( -- ) "unnest_stacks" %vm-invoke-1st-arg ;
-
 M: ##callback-return generate-insn
     #! All the extra book-keeping for %unwind is only for x86.
     #! On other platforms its an alias for %return.

basis/cpu/architecture/architecture.factor

@@ -395,6 +395,10 @@ HOOK: %alien-callback cpu ( quot -- )
 
 HOOK: %callback-value cpu ( ctype -- )
 
+HOOK: %nest-stacks cpu ( -- )
+
+HOOK: %unnest-stacks cpu ( -- )
+
 ! Return to caller with stdcall unwinding (only for x86)
 HOOK: %callback-return cpu ( params -- )
 

basis/cpu/ppc/ppc.factor

@@ -778,6 +778,12 @@ M: ppc %box-small-struct ( c-type -- )
     4 3 4 LWZ
     3 3 0 LWZ ;
 
+M: ppc %nest-stacks ( -- )
+    "nest_stacks" f %alien-invoke ;
+
+M: ppc %unnest-stacks ( -- )
+    "unnest_stacks" f %alien-invoke ;
+
 M: ppc %unbox-small-struct ( size -- )
     #! Alien must be in EAX.
     heap-size cell align cell /i {

basis/cpu/x86/32/32.factor

@@ -48,8 +48,7 @@ M: x86.32 reserved-area-size 0 ;
 M: x86.32 %alien-invoke 0 CALL rc-relative rel-dlsym ;
 
 : push-vm-ptr ( -- )
-    temp-reg 0 MOV rc-absolute-cell rt-vm rel-fixup ! push the vm ptr as an argument
-    temp-reg PUSH ;
+    0 PUSH rc-absolute-cell rt-vm rel-fixup ; ! push the vm ptr as an argument
 
 M: x86.32 return-struct-in-registers? ( c-type -- ? )
     c-type
@@ -238,6 +237,18 @@ M:: x86.32 %unbox-large-struct ( n c-type -- )
         "to_value_struct" f %alien-invoke
     ] with-aligned-stack ;
 
+M: x86.32 %nest-stacks ( -- )
+    4 [
+        push-vm-ptr
+        "nest_stacks" f %alien-invoke
+    ] with-aligned-stack ;
+
+M: x86.32 %unnest-stacks ( -- )
+    4 [
+        push-vm-ptr
+        "unnest_stacks" f %alien-invoke
+    ] with-aligned-stack ;
+
 M: x86.32 %prepare-alien-indirect ( -- )
     push-vm-ptr "unbox_alien" f %alien-invoke
     temp-reg POP
@@ -271,6 +282,7 @@ M: x86.32 %callback-value ( ctype -- )
     ! Unbox EAX
     unbox-return ;
 
+
 M: x86.32 %cleanup ( params -- )
     #! a) If we just called an stdcall function in Windows, it
     #! cleaned up the stack frame for us. But we don't want that

basis/cpu/x86/64/64.factor

@@ -190,6 +190,13 @@ M: x86.64 %alien-invoke
     rc-absolute-cell rel-dlsym
     R11 CALL ;
 
+M: x86.64 %nest-stacks ( -- )
+    param-reg-1 0 MOV rc-absolute-cell rt-vm rel-fixup
+    "nest_stacks" f %alien-invoke ;
+
+M: x86.64 %unnest-stacks ( -- )
+    param-reg-1 0 MOV rc-absolute-cell rt-vm rel-fixup
+    "unnest_stacks" f %alien-invoke ;
 
 M: x86.64 %prepare-alien-indirect ( -- )
     "unbox_alien" %vm-invoke-1st-arg