update for rust-lang/rust#49669

Author: dwrensha

src/eval_context.rs

@@ -623,7 +623,10 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                                 (Value::ByValPair(data, _), false) => {
                                     self.write_value(ValTy { value: Value::ByVal(data), ty: dest_ty }, dest)?;
                                 },
-                                (Value::ByVal(_), _) => bug!("expected fat ptr"),
+                                (Value::ByVal(v), false) => {
+                                    self.write_value(ValTy { value: Value::ByVal(v), ty: dest_ty }, dest)?;
+                                }
+                                (Value::ByVal(_), true) => bug!("expected fat ptr"),
                             }
                         } else {
                             // First, try casting
@@ -711,7 +714,15 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
     fn type_is_fat_ptr(&self, ty: Ty<'tcx>) -> bool {
         match ty.sty {
             ty::TyRawPtr(ref tam) |
-            ty::TyRef(_, ref tam) => !self.type_is_sized(tam.ty),
+            ty::TyRef(_, ref tam) => {
+                if let ty::TyForeign(def_id) =  tam.ty.sty {
+                    if "Opaque" == self.tcx.item_name(def_id) {
+                        // TODO make this more picky. We want it to only match std::alloc::Opaque.
+                        return false;
+                    }
+                }
+                !self.type_is_sized(tam.ty)
+            }
             ty::TyAdt(def, _) if def.is_box() => !self.type_is_sized(ty.boxed_ty()),
             _ => false,
         }

src/terminator/mod.rs

@@ -702,7 +702,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                 return Ok(());
             }
 
-            "alloc::heap::::__rust_alloc" => {
+            "alloc::alloc::::__rust_alloc" => {
                 let usize = self.tcx.types.usize;
                 let size = self.value_to_primval(args[0], usize)?.to_u64()?;
                 let align = self.value_to_primval(args[1], usize)?.to_u64()?;
@@ -716,7 +716,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                 return Ok(());
             }
 
-            "alloc::heap::::__rust_alloc_zeroed" => {
+            "alloc::alloc::::__rust_alloc_zeroed" => {
                 let usize = self.tcx.types.usize;
                 let size = self.value_to_primval(args[0], usize)?.to_u64()?;
                 let align = self.value_to_primval(args[1], usize)?.to_u64()?;
@@ -798,7 +798,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                 return Ok(());
             }
 
-            "alloc::heap::::__rust_realloc" => {
+            "alloc::alloc::::__rust_realloc" => {
                 let (lval, block) = destination.expect("realloc() does not diverge");
                 let dest_ptr = self.force_allocation(lval)?.to_ptr()?;
 
@@ -809,17 +809,16 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
 
                 let usize = self.tcx.types.usize;
                 let _old_size = self.value_to_primval(args[1], usize)?.to_u64()?;
-                let _old_align = self.value_to_primval(args[2], usize)?.to_u64()?;
+                let align = self.value_to_primval(args[2], usize)?.to_u64()?;
                 let new_size = self.value_to_primval(args[3], usize)?.to_u64()?;
-                let new_align = self.value_to_primval(args[4], usize)?.to_u64()?;
 
-                let new_ptr = self.memory.reallocate(ptr, new_size, new_align)?;
+                let new_ptr = self.memory.reallocate(ptr, new_size, align)?;
                 self.memory.write_ptr(dest_ptr, new_ptr)?;
                 self.goto_block(block);
                 return Ok(());
             }
 
-            "alloc::heap::::__rust_dealloc" => {
+            "alloc::alloc::::__rust_dealloc" => {
                 let (_lval, block) = destination.expect("dealloc() does not diverge");
 
                 let ptr = match args[0] {