Add some basic intrinsic support (only size_of atm)

example.rs

@@ -3,7 +3,7 @@
 #![allow(dead_code)]
 
 #[lang="sized"]
-trait Sized {}
+pub trait Sized {}
 
 #[lang="copy"]
 unsafe trait Copy {}
@@ -68,8 +68,11 @@ unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
     drop_in_place(to_drop);
 }
 
-extern "rust-intrinsic" {
-    fn copy<T>(src: *const T, dst: *mut T, count: usize);
+mod intrinsics {
+    extern "rust-intrinsic" {
+        pub fn size_of<T>() -> usize;
+        pub fn copy<T>(src: *const T, dst: *mut T, count: usize);
+    }
 }
 
 fn abc(a: u8) -> u8 {
@@ -149,10 +152,20 @@ fn debug_tuple() -> DebugTuple {
     DebugTuple(())
 }
 
-unsafe fn use_copy_intrinsic(src: *const u8, dst: *mut u8) {
-    copy::<u8>(src, dst, 1);
+fn size_of<T>() -> usize {
+    unsafe {
+        intrinsics::size_of::<T>()
+    }
 }
 
+fn use_size_of() -> usize {
+    size_of::<u64>()
+}
+
+/*unsafe fn use_copy_intrinsic(src: *const u8, dst: *mut u8) {
+    intrinsics::copy::<u8>(src, dst, 1);
+}*/
+
 /*unsafe fn use_copy_intrinsic_ref(src: *const u8, dst: *mut u8) {
     let copy2 = &copy::<u8>;
     copy2(src, dst, 1);

src/abi.rs

@@ -12,7 +12,7 @@ pub fn cton_sig_from_fn_ty<'a, 'tcx: 'a>(tcx: TyCtxt<'a, 'tcx, 'tcx>, fn_ty: Ty<
     let (call_conv, inputs, _output): (CallConv, Vec<Ty>, Ty) = match sig.abi {
         Abi::Rust => (CallConv::SystemV, sig.inputs().to_vec(), sig.output()),
         Abi::RustCall => {
-            unimplemented!();
+            unimplemented!("rust-call");
         }
         Abi::System => bug!("system abi should be selected elsewhere"),
         // TODO: properly implement intrinsics
@@ -153,15 +153,14 @@ pub fn codegen_call<'a, 'tcx: 'a>(
     destination: &Option<(Place<'tcx>, BasicBlock)>,
 ) {
     let func = ::base::trans_operand(fx, func);
+
     let return_place = if let Some((place, _)) = destination {
-        ::base::trans_place(fx, place).expect_addr()
+        Some(::base::trans_place(fx, place))
     } else {
-        fx.bcx.ins().iconst(types::I64, 0)
+        None
     };
-    let args = Some(return_place)
-        .into_iter()
-        .chain(
-            args
+
+    let args = args
         .into_iter()
         .map(|arg| {
             let arg = ::base::trans_operand(fx, arg);
@@ -171,7 +170,56 @@ pub fn codegen_call<'a, 'tcx: 'a>(
                 arg.force_stack(fx)
             }
         })
-        ).collect::<Vec<_>>();
+        .collect::<Vec<_>>();
+
+    let fn_ty = func.layout().ty;
+    if let TypeVariants::TyFnDef(def_id, substs) = fn_ty.sty {
+        let instance = ty::Instance::resolve(
+            fx.tcx,
+            ParamEnv::reveal_all(),
+            def_id,
+            substs
+        ).unwrap();
+
+        // Handle intrinsics old codegen wants Expr's for, ourselves.
+        if let InstanceDef::Intrinsic(def_id) = instance.def {
+            let intrinsic = fx.tcx.item_name(def_id).as_str();
+            let intrinsic = &intrinsic[..];
+
+            let usize_layout = fx.layout_of(fx.tcx.types.usize);
+            match intrinsic {
+                "copy" => {
+                    /*let elem_ty = substs.type_at(0);
+                    assert_eq!(args.len(), 3);
+                    let src = args[0];
+                    let dst = args[1];
+                    let count = args[2];*/
+                    unimplemented!("copy");
+                }
+                "size_of" => {
+                    let size_of = fx.layout_of(substs.type_at(0)).size.bytes();
+                    let size_of = CValue::const_val(fx, usize_layout.ty, size_of as i64);
+                    return_place.unwrap().write_cvalue(fx, size_of);
+                }
+                _ => fx.tcx.sess.fatal(&format!("unsupported intrinsic {}", intrinsic)),
+            }
+            if let Some((_, dest)) = *destination {
+                let ret_ebb = fx.get_ebb(dest);
+                fx.bcx.ins().jump(ret_ebb, &[]);
+            } else {
+                fx.bcx.ins().trap(TrapCode::User(!0));
+            }
+            return;
+        }
+    }
+
+    let return_ptr = match return_place {
+        Some(place) => place.expect_addr(),
+        None => fx.bcx.ins().iconst(types::I64, 0),
+    };
+
+    let args = Some(return_ptr).into_iter().chain(args).collect::<Vec<_>>();
+
     match func {
         CValue::Func(func, _) => {
             fx.bcx.ins().call(func, &args);

src/common.rs

@@ -168,7 +168,7 @@ impl<'a, 'tcx: 'a> CPlace<'tcx> {
     pub fn layout(&self) -> TyLayout<'tcx> {
         match *self {
             CPlace::Var(_, layout) |
-            CPlace::Addr(_, layout) => layout
+            CPlace::Addr(_, layout) => layout,
         }
     }