Auto merge of #40658 - eddyb:lay-more-out, r=arielb1

Use ty::layout for ABI computation instead of LLVM types.

This is the first step in creating a backend-agnostic library for computing call ABI details from signatures.
I wanted to open the PR *before* attempting to move `cabi_*` from trans to avoid rebase churn in #39999.
**EDIT**: As I suspected, #39999 needs this PR to fully work (see https://github.com/rust-lang/rust/pull/39999#issuecomment-287723379).

The first 3 commits add more APIs to `ty::layout` and replace non-ABI uses of `sizing_type_of`.
These APIs are probably usable by other backends, and miri too (cc @stoklund @solson).

The last commit rewrites `rustc_trans::cabi_*` to use `ty::layout` and new `rustc_trans::abi` APIs.
Also, during the process, a couple trivial bugs were identified and fixed:
* `msp430`, `nvptx`, `nvptx64`: type sizes *in bytes* were compared with `32` and `64`
* `x86` (`fastcall`): `f64` was incorrectly not treated the same way as `f32`

Although not urgent, this PR also uses the more general "homogenous aggregate" logic to fix #32045.

38 files changed, 1442 insertions, 1819 deletions

diff --git a/src/librustc/middle/intrinsicck.rs b/src/librustc/middle/intrinsicck.rs
index c9722adc951..8dc298b9c2a 100644
--- a/src/librustc/middle/intrinsicck.rs
+++ b/src/librustc/middle/intrinsicck.rs
@@ -89,7 +89,7 @@ impl<'a, 'gcx, 'tcx> ExprVisitor<'a, 'gcx, 'tcx> {
             let from = unpack_option_like(self.infcx.tcx.global_tcx(), from);
             match (&from.sty, sk_to) {
                 (&ty::TyFnDef(..), SizeSkeleton::Known(size_to))
-                        if size_to == Pointer.size(&self.infcx.tcx.data_layout) => {
+                        if size_to == Pointer.size(self.infcx) => {
                     struct_span_err!(self.infcx.tcx.sess, span, E0591,
                                      "`{}` is zero-sized and can't be transmuted to `{}`",
                                      from, to)
diff --git a/src/librustc/ty/layout.rs b/src/librustc/ty/layout.rs
index 571ef30b6b9..54e5de39090 100644
--- a/src/librustc/ty/layout.rs
+++ b/src/librustc/ty/layout.rs
@@ -25,6 +25,7 @@ use std::cmp;
 use std::fmt;
 use std::i64;
 use std::iter;
+use std::ops::Deref;
 
 /// Parsed [Data layout](http://llvm.org/docs/LangRef.html#data-layout)
 /// for a target, which contains everything needed to compute layouts.
@@ -201,6 +202,16 @@ impl TargetDataLayout {
     }
 }
 
+pub trait HasDataLayout: Copy {
+    fn data_layout(&self) -> &TargetDataLayout;
+}
+
+impl<'a> HasDataLayout for &'a TargetDataLayout {
+    fn data_layout(&self) -> &TargetDataLayout {
+        self
+    }
+}
+
 /// Endianness of the target, which must match cfg(target-endian).
 #[derive(Copy, Clone)]
 pub enum Endian {
@@ -241,7 +252,9 @@ impl Size {
         Size::from_bytes((self.bytes() + mask) & !mask)
     }
 
-    pub fn checked_add(self, offset: Size, dl: &TargetDataLayout) -> Option<Size> {
+    pub fn checked_add<C: HasDataLayout>(self, offset: Size, cx: C) -> Option<Size> {
+        let dl = cx.data_layout();
+
         // Each Size is less than dl.obj_size_bound(), so the sum is
         // also less than 1 << 62 (and therefore can't overflow).
         let bytes = self.bytes() + offset.bytes();
@@ -253,7 +266,9 @@ impl Size {
         }
     }
 
-    pub fn checked_mul(self, count: u64, dl: &TargetDataLayout) -> Option<Size> {
+    pub fn checked_mul<C: HasDataLayout>(self, count: u64, cx: C) -> Option<Size> {
+        let dl = cx.data_layout();
+
         // Each Size is less than dl.obj_size_bound(), so the sum is
         // also less than 1 << 62 (and therefore can't overflow).
         match self.bytes().checked_mul(count) {
@@ -353,7 +368,9 @@ impl Integer {
         }
     }
 
-    pub fn align(&self, dl: &TargetDataLayout)-> Align {
+    pub fn align<C: HasDataLayout>(&self, cx: C) -> Align {
+        let dl = cx.data_layout();
+
         match *self {
             I1 => dl.i1_align,
             I8 => dl.i8_align,
@@ -407,7 +424,9 @@ impl Integer {
     }
 
     /// Find the smallest integer with the given alignment.
-    pub fn for_abi_align(dl: &TargetDataLayout, align: Align) -> Option<Integer> {
+    pub fn for_abi_align<C: HasDataLayout>(cx: C, align: Align) -> Option<Integer> {
+        let dl = cx.data_layout();
+
         let wanted = align.abi();
         for &candidate in &[I8, I16, I32, I64] {
             let ty = Int(candidate);
@@ -419,7 +438,9 @@ impl Integer {
     }
 
     /// Get the Integer type from an attr::IntType.
-    pub fn from_attr(dl: &TargetDataLayout, ity: attr::IntType) -> Integer {
+    pub fn from_attr<C: HasDataLayout>(cx: C, ity: attr::IntType) -> Integer {
+        let dl = cx.data_layout();
+
         match ity {
             attr::SignedInt(IntTy::I8) | attr::UnsignedInt(UintTy::U8) => I8,
             attr::SignedInt(IntTy::I16) | attr::UnsignedInt(UintTy::U16) => I16,
@@ -449,7 +470,7 @@ impl Integer {
         let min_default = I8;
 
         if let Some(ity) = repr.int {
-            let discr = Integer::from_attr(&tcx.data_layout, ity);
+            let discr = Integer::from_attr(tcx, ity);
             let fit = if ity.is_signed() { signed_fit } else { unsigned_fit };
             if discr < fit {
                 bug!("Integer::repr_discr: `#[repr]` hint too small for \
@@ -490,7 +511,9 @@ pub enum Primitive {
 }
 
 impl Primitive {
-    pub fn size(self, dl: &TargetDataLayout) -> Size {
+    pub fn size<C: HasDataLayout>(self, cx: C) -> Size {
+        let dl = cx.data_layout();
+
         match self {
             Int(I1) | Int(I8) => Size::from_bits(8),
             Int(I16) => Size::from_bits(16),
@@ -501,7 +524,9 @@ impl Primitive {
         }
     }
 
-    pub fn align(self, dl: &TargetDataLayout) -> Align {
+    pub fn align<C: HasDataLayout>(self, cx: C) -> Align {
+        let dl = cx.data_layout();
+
         match self {
             Int(I1) => dl.i1_align,
             Int(I8) => dl.i8_align,
@@ -681,8 +706,8 @@ impl<'a, 'gcx, 'tcx> Struct {
     }
 
     /// Determine whether a structure would be zero-sized, given its fields.
-    pub fn would_be_zero_sized<I>(dl: &TargetDataLayout, fields: I)
-                                  -> Result<bool, LayoutError<'gcx>>
+    fn would_be_zero_sized<I>(dl: &TargetDataLayout, fields: I)
+                              -> Result<bool, LayoutError<'gcx>>
     where I: Iterator<Item=Result<&'a Layout, LayoutError<'gcx>>> {
         for field in fields {
             let field = field?;
@@ -830,7 +855,7 @@ pub struct Union {
 }
 
 impl<'a, 'gcx, 'tcx> Union {
-    pub fn new(dl: &TargetDataLayout, packed: bool) -> Union {
+    fn new(dl: &TargetDataLayout, packed: bool) -> Union {
         Union {
             align: if packed { dl.i8_align } else { dl.aggregate_align },
             min_size: Size::from_bytes(0),
@@ -839,10 +864,10 @@ impl<'a, 'gcx, 'tcx> Union {
     }
 
     /// Extend the Struct with more fields.
-    pub fn extend<I>(&mut self, dl: &TargetDataLayout,
-                     fields: I,
-                     scapegoat: Ty<'gcx>)
-                     -> Result<(), LayoutError<'gcx>>
+    fn extend<I>(&mut self, dl: &TargetDataLayout,
+                 fields: I,
+                 scapegoat: Ty<'gcx>)
+                 -> Result<(), LayoutError<'gcx>>
     where I: Iterator<Item=Result<&'a Layout, LayoutError<'gcx>>> {
         for (index, field) in fields.enumerate() {
             let field = field?;
@@ -904,7 +929,8 @@ pub enum Layout {
         /// If true, the size is exact, otherwise it's only a lower bound.
         sized: bool,
         align: Align,
-        size: Size
+        element_size: Size,
+        count: u64
     },
 
     /// TyRawPtr or TyRef with a !Sized pointee.
@@ -1087,25 +1113,35 @@ impl<'a, 'gcx, 'tcx> Layout {
             // Arrays and slices.
             ty::TyArray(element, count) => {
                 let element = element.layout(infcx)?;
+                let element_size = element.size(dl);
+                // FIXME(eddyb) Don't use host `usize` for array lengths.
+                let usize_count: usize = count;
+                let count = usize_count as u64;
+                if element_size.checked_mul(count, dl).is_none() {
+                    return Err(LayoutError::SizeOverflow(ty));
+                }
                 Array {
                     sized: true,
                     align: element.align(dl),
-                    size: element.size(dl).checked_mul(count as u64, dl)
-                                 .map_or(Err(LayoutError::SizeOverflow(ty)), Ok)?
+                    element_size: element_size,
+                    count: count
                 }
             }
             ty::TySlice(element) => {
+                let element = element.layout(infcx)?;
                 Array {
                     sized: false,
-                    align: element.layout(infcx)?.align(dl),
-                    size: Size::from_bytes(0)
+                    align: element.align(dl),
+                    element_size: element.size(dl),
+                    count: 0
                 }
             }
             ty::TyStr => {
                 Array {
                     sized: false,
                     align: dl.i8_align,
-                    size: Size::from_bytes(0)
+                    element_size: Size::from_bytes(1),
+                    count: 0
                 }
             }
 
@@ -1440,22 +1476,32 @@ impl<'a, 'gcx, 'tcx> Layout {
         }
     }
 
-    pub fn size(&self, dl: &TargetDataLayout) -> Size {
+    pub fn size<C: HasDataLayout>(&self, cx: C) -> Size {
+        let dl = cx.data_layout();
+
         match *self {
             Scalar { value, .. } | RawNullablePointer { value, .. } => {
                 value.size(dl)
             }
 
             Vector { element, count } => {
-                let elem_size = element.size(dl);
-                let vec_size = match elem_size.checked_mul(count, dl) {
+                let element_size = element.size(dl);
+                let vec_size = match element_size.checked_mul(count, dl) {
                     Some(size) => size,
                     None => bug!("Layout::size({:?}): {} * {} overflowed",
-                                 self, elem_size.bytes(), count)
+                                 self, element_size.bytes(), count)
                 };
                 vec_size.abi_align(self.align(dl))
             }
 
+            Array { element_size, count, .. } => {
+                match element_size.checked_mul(count, dl) {
+                    Some(size) => size,
+                    None => bug!("Layout::size({:?}): {} * {} overflowed",
+                                 self, element_size.bytes(), count)
+                }
+            }
+
             FatPointer { metadata, .. } => {
                 // Effectively a (ptr, meta) tuple.
                 Pointer.size(dl).abi_align(metadata.align(dl))
@@ -1464,7 +1510,7 @@ impl<'a, 'gcx, 'tcx> Layout {
             }
 
             CEnum { discr, .. } => Int(discr).size(dl),
-            Array { size, .. } | General { size, .. } => size,
+            General { size, .. } => size,
             UntaggedUnion { ref variants } => variants.stride(),
 
             Univariant { ref variant, .. } |
@@ -1474,7 +1520,9 @@ impl<'a, 'gcx, 'tcx> Layout {
         }
     }
 
-    pub fn align(&self, dl: &TargetDataLayout) -> Align {
+    pub fn align<C: HasDataLayout>(&self, cx: C) -> Align {
+        let dl = cx.data_layout();
+
         match *self {
             Scalar { value, .. } | RawNullablePointer { value, .. } => {
                 value.align(dl)
@@ -1513,6 +1561,61 @@ impl<'a, 'gcx, 'tcx> Layout {
             }
         }
     }
+
+    pub fn field_offset<C: HasDataLayout>(&self,
+                                          cx: C,
+                                          i: usize,
+                                          variant_index: Option<usize>)
+                                          -> Size {
+        let dl = cx.data_layout();
+
+        match *self {
+            Scalar { .. } |
+            CEnum { .. } |
+            UntaggedUnion { .. } |
+            RawNullablePointer { .. } => {
+                Size::from_bytes(0)
+            }
+
+            Vector { element, count } => {
+                let element_size = element.size(dl);
+                let i = i as u64;
+                assert!(i < count);
+                Size::from_bytes(element_size.bytes() * count)
+            }
+
+            Array { element_size, count, .. } => {
+                let i = i as u64;
+                assert!(i < count);
+                Size::from_bytes(element_size.bytes() * count)
+            }
+
+            FatPointer { metadata, .. } => {
+                // Effectively a (ptr, meta) tuple.
+                assert!(i < 2);
+                if i == 0 {
+                    Size::from_bytes(0)
+                } else {
+                    Pointer.size(dl).abi_align(metadata.align(dl))
+                }
+            }
+
+            Univariant { ref variant, .. } => variant.offsets[i],
+
+            General { ref variants, .. } => {
+                let v = variant_index.expect("variant index required");
+                variants[v].offsets[i + 1]
+            }
+
+            StructWrappedNullablePointer { nndiscr, ref nonnull, .. } => {
+                if Some(nndiscr as usize) == variant_index {
+                    nonnull.offsets[i]
+                } else {
+                    Size::from_bytes(0)
+                }
+            }
+        }
+    }
 }
 
 /// Type size "skeleton", i.e. the only information determining a type's size.
@@ -1544,7 +1647,7 @@ impl<'a, 'gcx, 'tcx> SizeSkeleton<'gcx> {
         // First try computing a static layout.
         let err = match ty.layout(infcx) {
             Ok(layout) => {
-                return Ok(SizeSkeleton::Known(layout.size(&tcx.data_layout)));
+                return Ok(SizeSkeleton::Known(layout.size(tcx)));
             }
             Err(err) => err
         };
@@ -1658,3 +1761,192 @@ impl<'a, 'gcx, 'tcx> SizeSkeleton<'gcx> {
         }
     }
 }
+
+/// A pair of a type and its layout. Implements various
+/// type traversal APIs (e.g. recursing into fields).
+#[derive(Copy, Clone, Debug)]
+pub struct TyLayout<'tcx> {
+    pub ty: Ty<'tcx>,
+    pub layout: &'tcx Layout,
+    pub variant_index: Option<usize>,
+}
+
+impl<'tcx> Deref for TyLayout<'tcx> {
+    type Target = Layout;
+    fn deref(&self) -> &Layout {
+        self.layout
+    }
+}
+
+pub trait HasTyCtxt<'tcx>: HasDataLayout {
+    fn tcx<'a>(&'a self) -> TyCtxt<'a, 'tcx, 'tcx>;
+}
+
+impl<'a, 'gcx, 'tcx> HasDataLayout for TyCtxt<'a, 'gcx, 'tcx> {
+    fn data_layout(&self) -> &TargetDataLayout {
+        &self.data_layout
+    }
+}
+
+impl<'a, 'gcx, 'tcx> HasTyCtxt<'gcx> for TyCtxt<'a, 'gcx, 'tcx> {
+    fn tcx<'b>(&'b self) -> TyCtxt<'b, 'gcx, 'gcx> {
+        self.global_tcx()
+    }
+}
+
+impl<'a, 'gcx, 'tcx> HasDataLayout for &'a InferCtxt<'a, 'gcx, 'tcx> {
+    fn data_layout(&self) -> &TargetDataLayout {
+        &self.tcx.data_layout
+    }
+}
+
+impl<'a, 'gcx, 'tcx> HasTyCtxt<'gcx> for &'a InferCtxt<'a, 'gcx, 'tcx> {
+    fn tcx<'b>(&'b self) -> TyCtxt<'b, 'gcx, 'gcx> {
+        self.tcx.global_tcx()
+    }
+}
+
+pub trait LayoutTyper<'tcx>: HasTyCtxt<'tcx> {
+    type TyLayout;
+
+    fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout;
+}
+
+impl<'a, 'gcx, 'tcx> LayoutTyper<'gcx> for &'a InferCtxt<'a, 'gcx, 'tcx> {
+    type TyLayout = Result<TyLayout<'gcx>, LayoutError<'gcx>>;
+
+    fn layout_of(self, ty: Ty<'gcx>) -> Self::TyLayout {
+        let ty = normalize_associated_type(self, ty);
+
+        Ok(TyLayout {
+            ty: ty,
+            layout: ty.layout(self)?,
+            variant_index: None
+        })
+    }
+}
+
+impl<'a, 'tcx> TyLayout<'tcx> {
+    pub fn for_variant(&self, variant_index: usize) -> Self {
+        TyLayout {
+            variant_index: Some(variant_index),
+            ..*self
+        }
+    }
+
+    pub fn field_offset<C: HasDataLayout>(&self, cx: C, i: usize) -> Size {
+        self.layout.field_offset(cx, i, self.variant_index)
+    }
+
+    pub fn field_count(&self) -> usize {
+        // Handle enum/union through the type rather than Layout.
+        if let ty::TyAdt(def, _) = self.ty.sty {
+            let v = self.variant_index.unwrap_or(0);
+            if def.variants.is_empty() {
+                assert_eq!(v, 0);
+                return 0;
+            } else {
+                return def.variants[v].fields.len();
+            }
+        }
+
+        match *self.layout {
+            Scalar { .. } => {
+                bug!("TyLayout::field_count({:?}): not applicable", self)
+            }
+
+            // Handled above (the TyAdt case).
+            CEnum { .. } |
+            General { .. } |
+            UntaggedUnion { .. } |
+            RawNullablePointer { .. } |
+            StructWrappedNullablePointer { .. } => bug!(),
+
+            FatPointer { .. } => 2,
+
+            Vector { count, .. } |
+            Array { count, .. } => {
+                let usize_count = count as usize;
+                assert_eq!(usize_count as u64, count);
+                usize_count
+            }
+
+            Univariant { ref variant, .. } => variant.offsets.len(),
+        }
+    }
+
+    pub fn field_type<C: HasTyCtxt<'tcx>>(&self, cx: C, i: usize) -> Ty<'tcx> {
+        let tcx = cx.tcx();
+
+        let ptr_field_type = |pointee: Ty<'tcx>| {
+            let slice = |element: Ty<'tcx>| {
+                assert!(i < 2);
+                if i == 0 {
+                    tcx.mk_mut_ptr(element)
+                } else {
+                    tcx.types.usize
+                }
+            };
+            match tcx.struct_tail(pointee).sty {
+                ty::TySlice(element) => slice(element),
+                ty::TyStr => slice(tcx.types.u8),
+                ty::TyDynamic(..) => tcx.mk_mut_ptr(tcx.mk_nil()),
+                _ => bug!("TyLayout::field_type({:?}): not applicable", self)
+            }
+        };
+
+        match self.ty.sty {
+            ty::TyBool |
+            ty::TyChar |
+            ty::TyInt(_) |
+            ty::TyUint(_) |
+            ty::TyFloat(_) |
+            ty::TyFnPtr(_) |
+            ty::TyNever |
+            ty::TyFnDef(..) |
+            ty::TyDynamic(..) => {
+                bug!("TyLayout::field_type({:?}): not applicable", self)
+            }
+
+            // Potentially-fat pointers.
+            ty::TyRef(_, ty::TypeAndMut { ty: pointee, .. }) |
+            ty::TyRawPtr(ty::TypeAndMut { ty: pointee, .. }) => {
+                ptr_field_type(pointee)
+            }
+            ty::TyAdt(def, _) if def.is_box() => {
+                ptr_field_type(self.ty.boxed_ty())
+            }
+
+            // Arrays and slices.
+            ty::TyArray(element, _) |
+            ty::TySlice(element) => element,
+            ty::TyStr => tcx.types.u8,
+
+            // Tuples and closures.
+            ty::TyClosure(def_id, ref substs) => {
+                substs.upvar_tys(def_id, tcx).nth(i).unwrap()
+            }
+
+            ty::TyTuple(tys, _) => tys[i],
+
+            // SIMD vector types.
+            ty::TyAdt(def, ..) if def.repr.simd => {
+                self.ty.simd_type(tcx)
+            }
+
+            // ADTs.
+            ty::TyAdt(def, substs) => {
+                def.variants[self.variant_index.unwrap_or(0)].fields[i].ty(tcx, substs)
+            }
+
+            ty::TyProjection(_) | ty::TyAnon(..) | ty::TyParam(_) |
+            ty::TyInfer(_) | ty::TyError => {
+                bug!("TyLayout::field_type: unexpected type `{}`", self.ty)
+            }
+        }
+    }
+
+    pub fn field<C: LayoutTyper<'tcx>>(&self, cx: C, i: usize) -> C::TyLayout {
+        cx.layout_of(self.field_type(cx, i))
+    }
+}
diff --git a/src/librustc_lint/types.rs b/src/librustc_lint/types.rs
index 529afe0215e..2318bb81aff 100644
--- a/src/librustc_lint/types.rs
+++ b/src/librustc_lint/types.rs
@@ -733,7 +733,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for VariantSizeDifferences {
                 });
 
                 if let Layout::General { ref variants, ref size, discr, .. } = *layout {
-                    let discr_size = Primitive::Int(discr).size(&cx.tcx.data_layout).bytes();
+                    let discr_size = Primitive::Int(discr).size(cx.tcx).bytes();
 
                     debug!("enum `{}` is {} bytes large with layout:\n{:#?}",
                       t, size.bytes(), layout);
diff --git a/src/librustc_trans/abi.rs b/src/librustc_trans/abi.rs
index 453f65eb762..7be80a757ca 100644
--- a/src/librustc_trans/abi.rs
+++ b/src/librustc_trans/abi.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use llvm::{self, ValueRef, Integer, Pointer, Float, Double, Struct, Array, Vector, AttributePlace};
+use llvm::{self, ValueRef, AttributePlace};
 use base;
 use builder::Builder;
 use common::{type_is_fat_ptr, C_uint};
@@ -29,19 +29,20 @@ use cabi_sparc;
 use cabi_sparc64;
 use cabi_nvptx;
 use cabi_nvptx64;
-use machine::{llalign_of_min, llsize_of, llsize_of_alloc};
+use machine::llalign_of_min;
 use type_::Type;
 use type_of;
 
 use rustc::hir;
 use rustc::ty::{self, Ty};
+use rustc::ty::layout::{self, Layout, LayoutTyper, TyLayout, Size};
 
 use libc::c_uint;
 use std::cmp;
+use std::iter;
 
 pub use syntax::abi::Abi;
 pub use rustc::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};
-use rustc::ty::layout::Layout;
 
 #[derive(Clone, Copy, PartialEq, Debug)]
 enum ArgKind {
@@ -132,33 +133,293 @@ impl ArgAttributes {
         }
     }
 }
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub enum RegKind {
+    Integer,
+    Float,
+    Vector
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub struct Reg {
+    pub kind: RegKind,
+    pub size: Size,
+}
+
+macro_rules! reg_ctor {
+    ($name:ident, $kind:ident, $bits:expr) => {
+        pub fn $name() -> Reg {
+            Reg {
+                kind: RegKind::$kind,
+                size: Size::from_bits($bits)
+            }
+        }
+    }
+}
+
+impl Reg {
+    reg_ctor!(i8, Integer, 8);
+    reg_ctor!(i16, Integer, 16);
+    reg_ctor!(i32, Integer, 32);
+    reg_ctor!(i64, Integer, 64);
+
+    reg_ctor!(f32, Float, 32);
+    reg_ctor!(f64, Float, 64);
+}
+
+impl Reg {
+    fn llvm_type(&self, ccx: &CrateContext) -> Type {
+        match self.kind {
+            RegKind::Integer => Type::ix(ccx, self.size.bits()),
+            RegKind::Float => {
+                match self.size.bits() {
+                    32 => Type::f32(ccx),
+                    64 => Type::f64(ccx),
+                    _ => bug!("unsupported float: {:?}", self)
+                }
+            }
+            RegKind::Vector => {
+                Type::vector(&Type::i8(ccx), self.size.bytes())
+            }
+        }
+    }
+}
+
+/// An argument passed entirely registers with the
+/// same kind (e.g. HFA / HVA on PPC64 and AArch64).
+#[derive(Copy, Clone)]
+pub struct Uniform {
+    pub unit: Reg,
+
+    /// The total size of the argument, which can be:
+    /// * equal to `unit.size` (one scalar/vector)
+    /// * a multiple of `unit.size` (an array of scalar/vectors)
+    /// * if `unit.kind` is `Integer`, the last element
+    ///   can be shorter, i.e. `{ i64, i64, i32 }` for
+    ///   64-bit integers with a total size of 20 bytes
+    pub total: Size,
+}
+
+impl From<Reg> for Uniform {
+    fn from(unit: Reg) -> Uniform {
+        Uniform {
+            unit,
+            total: unit.size
+        }
+    }
+}
+
+impl Uniform {
+    fn llvm_type(&self, ccx: &CrateContext) -> Type {
+        let llunit = self.unit.llvm_type(ccx);
+
+        if self.total <= self.unit.size {
+            return llunit;
+        }
+
+        let count = self.total.bytes() / self.unit.size.bytes();
+        let rem_bytes = self.total.bytes() % self.unit.size.bytes();
+
+        if rem_bytes == 0 {
+            return Type::array(&llunit, count);
+        }
+
+        // Only integers can be really split further.
+        assert_eq!(self.unit.kind, RegKind::Integer);
+
+        let args: Vec<_> = (0..count).map(|_| llunit)
+            .chain(iter::once(Type::ix(ccx, rem_bytes * 8)))
+            .collect();
+
+        Type::struct_(ccx, &args, false)
+    }
+}
+
+pub trait LayoutExt<'tcx> {
+    fn is_aggregate(&self) -> bool;
+    fn homogenous_aggregate<'a>(&self, ccx: &CrateContext<'a, 'tcx>) -> Option<Reg>;
+}
+
+impl<'tcx> LayoutExt<'tcx> for TyLayout<'tcx> {
+    fn is_aggregate(&self) -> bool {
+        match *self.layout {
+            Layout::Scalar { .. } |
+            Layout::RawNullablePointer { .. } |
+            Layout::CEnum { .. } |
+            Layout::Vector { .. } => false,
+
+            Layout::Array { .. } |
+            Layout::FatPointer { .. } |
+            Layout::Univariant { .. } |
+            Layout::UntaggedUnion { .. } |
+            Layout::General { .. } |
+            Layout::StructWrappedNullablePointer { .. } => true
+        }
+    }
+
+    fn homogenous_aggregate<'a>(&self, ccx: &CrateContext<'a, 'tcx>) -> Option<Reg> {
+        match *self.layout {
+            // The primitives for this algorithm.
+            Layout::Scalar { value, .. } |
+            Layout::RawNullablePointer { value, .. } => {
+                let kind = match value {
+                    layout::Int(_) |
+                    layout::Pointer => RegKind::Integer,
+                    layout::F32 |
+                    layout::F64 => RegKind::Float
+                };
+                Some(Reg {
+                    kind,
+                    size: self.size(ccx)
+                })
+            }
+
+            Layout::CEnum { .. } => {
+                Some(Reg {
+                    kind: RegKind::Integer,
+                    size: self.size(ccx)
+                })
+            }
+
+            Layout::Vector { .. } => {
+                Some(Reg {
+                    kind: RegKind::Integer,
+                    size: self.size(ccx)
+                })
+            }
+
+            Layout::Array { count, .. } => {
+                if count > 0 {
+                    self.field(ccx, 0).homogenous_aggregate(ccx)
+                } else {
+                    None
+                }
+            }
+
+            Layout::Univariant { ref variant, .. } => {
+                let mut unaligned_offset = Size::from_bytes(0);
+                let mut result = None;
+
+                for i in 0..self.field_count() {
+                    if unaligned_offset != variant.offsets[i] {
+                        return None;
+                    }
+
+                    let field = self.field(ccx, i);
+                    match (result, field.homogenous_aggregate(ccx)) {
+                        // The field itself must be a homogenous aggregate.
+                        (_, None) => return None,
+                        // If this is the first field, record the unit.
+                        (None, Some(unit)) => {
+                            result = Some(unit);
+                        }
+                        // For all following fields, the unit must be the same.
+                        (Some(prev_unit), Some(unit)) => {
+                            if prev_unit != unit {
+                                return None;
+                            }
+                        }
+                    }
+
+                    // Keep track of the offset (without padding).
+                    let size = field.size(ccx);
+                    match unaligned_offset.checked_add(size, ccx) {
+                        Some(offset) => unaligned_offset = offset,
+                        None => return None
+                    }
+                }
+
+                // There needs to be no padding.
+                if unaligned_offset != self.size(ccx) {
+                    None
+                } else {
+                    result
+                }
+            }
+
+            Layout::UntaggedUnion { .. } => {
+                let mut max = Size::from_bytes(0);
+                let mut result = None;
+
+                for i in 0..self.field_count() {
+                    let field = self.field(ccx, i);
+                    match (result, field.homogenous_aggregate(ccx)) {
+                        // The field itself must be a homogenous aggregate.
+                        (_, None) => return None,
+                        // If this is the first field, record the unit.
+                        (None, Some(unit)) => {
+                            result = Some(unit);
+                        }
+                        // For all following fields, the unit must be the same.
+                        (Some(prev_unit), Some(unit)) => {
+                            if prev_unit != unit {
+                                return None;
+                            }
+                        }
+                    }
+
+                    // Keep track of the offset (without padding).
+                    let size = field.size(ccx);
+                    if size > max {
+                        max = size;
+                    }
+                }
+
+                // There needs to be no padding.
+                if max != self.size(ccx) {
+                    None
+                } else {
+                    result
+                }
+            }
+
+            // Rust-specific types, which we can ignore for C ABIs.
+            Layout::FatPointer { .. } |
+            Layout::General { .. } |
+            Layout::StructWrappedNullablePointer { .. } => None
+        }
+    }
+}
+
+pub enum CastTarget {
+    Uniform(Uniform),
+    Pair(Reg, Reg)
+}
+
+impl From<Reg> for CastTarget {
+    fn from(unit: Reg) -> CastTarget {
+        CastTarget::Uniform(Uniform::from(unit))
+    }
+}
+
+impl From<Uniform> for CastTarget {
+    fn from(uniform: Uniform) -> CastTarget {
+        CastTarget::Uniform(uniform)
+    }
+}
+
+impl CastTarget {
+    fn llvm_type(&self, ccx: &CrateContext) -> Type {
+        match *self {
+            CastTarget::Uniform(u) => u.llvm_type(ccx),
+            CastTarget::Pair(a, b) => {
+                Type::struct_(ccx, &[
+                    a.llvm_type(ccx),
+                    b.llvm_type(ccx)
+                ], false)
+            }
+        }
+    }
+}
 
 /// Information about how a specific C type
 /// should be passed to or returned from a function
 ///
 /// This is borrowed from clang's ABIInfo.h
 #[derive(Clone, Copy, Debug)]
-pub struct ArgType {
+pub struct ArgType<'tcx> {
     kind: ArgKind,
-    /// Original LLVM type
-    pub original_ty: Type,
-    /// Sizing LLVM type (pointers are opaque).
-    /// Unlike original_ty, this is guaranteed to be complete.
-    ///
-    /// For example, while we're computing the function pointer type in
-    /// `struct Foo(fn(Foo));`, `original_ty` is still LLVM's `%Foo = {}`.
-    /// The field type will likely end up being `void(%Foo)*`, but we cannot
-    /// use `%Foo` to compute properties (e.g. size and alignment) of `Foo`,
-    /// until `%Foo` is completed by having all of its field types inserted,
-    /// so `ty` holds the "sizing type" of `Foo`, which replaces all pointers
-    /// with opaque ones, resulting in `{i8*}` for `Foo`.
-    /// ABI-specific logic can then look at the size, alignment and fields of
-    /// `{i8*}` in order to determine how the argument will be passed.
-    /// Only later will `original_ty` aka `%Foo` be used in the LLVM function
-    /// pointer type, without ever having introspected it.
-    pub ty: Type,
-    /// Signedness for integer types, None for other types
-    pub signedness: Option<bool>,
+    pub layout: TyLayout<'tcx>,
     /// Coerced LLVM Type
     pub cast: Option<Type>,
     /// Dummy argument, which is emitted before the real argument
@@ -167,26 +428,24 @@ pub struct ArgType {
     pub attrs: ArgAttributes
 }
 
-impl ArgType {
-    fn new(original_ty: Type, ty: Type) -> ArgType {
+impl<'a, 'tcx> ArgType<'tcx> {
+    fn new(layout: TyLayout<'tcx>) -> ArgType<'tcx> {
         ArgType {
             kind: ArgKind::Direct,
-            original_ty: original_ty,
-            ty: ty,
-            signedness: None,
+            layout: layout,
             cast: None,
             pad: None,
             attrs: ArgAttributes::default()
         }
     }
 
-    pub fn make_indirect(&mut self, ccx: &CrateContext) {
+    pub fn make_indirect(&mut self, ccx: &CrateContext<'a, 'tcx>) {
         assert_eq!(self.kind, ArgKind::Direct);
 
         // Wipe old attributes, likely not valid through indirection.
         self.attrs = ArgAttributes::default();
 
-        let llarg_sz = llsize_of_alloc(ccx, self.ty);
+        let llarg_sz = self.layout.size(ccx).bytes();
 
         // For non-immediate arguments the callee gets its own copy of
         // the value on the stack, so there are no aliases. It's also
@@ -205,17 +464,44 @@ impl ArgType {
 
     pub fn extend_integer_width_to(&mut self, bits: u64) {
         // Only integers have signedness
-        if let Some(signed) = self.signedness {
-            if self.ty.int_width() < bits {
-                self.attrs.set(if signed {
-                    ArgAttribute::SExt
-                } else {
-                    ArgAttribute::ZExt
-                });
+        let (i, signed) = match *self.layout {
+            Layout::Scalar { value, .. } => {
+                match value {
+                    layout::Int(i) => {
+                        if self.layout.ty.is_integral() {
+                            (i, self.layout.ty.is_signed())
+                        } else {
+                            return;
+                        }
+                    }
+                    _ => return
+                }
             }
+
+            // Rust enum types that map onto C enums also need to follow
+            // the target ABI zero-/sign-extension rules.
+            Layout::CEnum { discr, signed, .. } => (discr, signed),
+
+            _ => return
+        };
+
+        if i.size().bits() < bits {
+            self.attrs.set(if signed {
+                ArgAttribute::SExt
+            } else {
+                ArgAttribute::ZExt
+            });
         }
     }
 
+    pub fn cast_to<T: Into<CastTarget>>(&mut self, ccx: &CrateContext, target: T) {
+        self.cast = Some(target.into().llvm_type(ccx));
+    }
+
+    pub fn pad_with(&mut self, ccx: &CrateContext, reg: Reg) {
+        self.pad = Some(reg.llvm_type(ccx));
+    }
+
     pub fn is_indirect(&self) -> bool {
         self.kind == ArgKind::Indirect
     }
@@ -224,18 +510,24 @@ impl ArgType {
         self.kind == ArgKind::Ignore
     }
 
+    /// Get the LLVM type for an lvalue of the original Rust type of
+    /// this argument/return, i.e. the result of `type_of::type_of`.
+    pub fn memory_ty(&self, ccx: &CrateContext<'a, 'tcx>) -> Type {
+        type_of::type_of(ccx, self.layout.ty)
+    }
+
     /// Store a direct/indirect value described by this ArgType into a
     /// lvalue for the original Rust type of this argument/return.
     /// Can be used for both storing formal arguments into Rust variables
     /// or results of call/invoke instructions into their destinations.
-    pub fn store(&self, bcx: &Builder, mut val: ValueRef, dst: ValueRef) {
+    pub fn store(&self, bcx: &Builder<'a, 'tcx>, mut val: ValueRef, dst: ValueRef) {
         if self.is_ignore() {
             return;
         }
         let ccx = bcx.ccx;
         if self.is_indirect() {
-            let llsz = llsize_of(ccx, self.ty);
-            let llalign = llalign_of_min(ccx, self.ty);
+            let llsz = C_uint(ccx, self.layout.size(ccx).bytes());
+            let llalign = self.layout.align(ccx).abi();
             base::call_memcpy(bcx, dst, val, llsz, llalign as u32);
         } else if let Some(ty) = self.cast {
             // FIXME(eddyb): Figure out when the simpler Store is safe, clang
@@ -243,8 +535,8 @@ impl ArgType {
             let can_store_through_cast_ptr = false;
             if can_store_through_cast_ptr {
                 let cast_dst = bcx.pointercast(dst, ty.ptr_to());
-                let llalign = llalign_of_min(ccx, self.ty);
-                bcx.store(val, cast_dst, Some(llalign));
+                let llalign = self.layout.align(ccx).abi();
+                bcx.store(val, cast_dst, Some(llalign as u32));
             } else {
                 // The actual return type is a struct, but the ABI
                 // adaptation code has cast it into some scalar type.  The
@@ -271,21 +563,21 @@ impl ArgType {
                 base::call_memcpy(bcx,
                                   bcx.pointercast(dst, Type::i8p(ccx)),
                                   bcx.pointercast(llscratch, Type::i8p(ccx)),
-                                  C_uint(ccx, llsize_of_alloc(ccx, self.ty)),
-                                  cmp::min(llalign_of_min(ccx, self.ty),
-                                           llalign_of_min(ccx, ty)) as u32);
+                                  C_uint(ccx, self.layout.size(ccx).bytes()),
+                                  cmp::min(self.layout.align(ccx).abi() as u32,
+                                           llalign_of_min(ccx, ty)));
 
                 base::Lifetime::End.call(bcx, llscratch);
             }
         } else {
-            if self.original_ty == Type::i1(ccx) {
+            if self.layout.ty == ccx.tcx().types.bool {
                 val = bcx.zext(val, Type::i8(ccx));
             }
             bcx.store(val, dst, None);
         }
     }
 
-    pub fn store_fn_arg(&self, bcx: &Builder, idx: &mut usize, dst: ValueRef) {
+    pub fn store_fn_arg(&self, bcx: &Builder<'a, 'tcx>, idx: &mut usize, dst: ValueRef) {
         if self.pad.is_some() {
             *idx += 1;
         }
@@ -304,30 +596,30 @@ impl ArgType {
 /// I will do my best to describe this structure, but these
 /// comments are reverse-engineered and may be inaccurate. -NDM
 #[derive(Clone, Debug)]
-pub struct FnType {
+pub struct FnType<'tcx> {
     /// The LLVM types of each argument.
-    pub args: Vec<ArgType>,
+    pub args: Vec<ArgType<'tcx>>,
 
     /// LLVM return type.
-    pub ret: ArgType,
+    pub ret: ArgType<'tcx>,
 
     pub variadic: bool,
 
     pub cconv: llvm::CallConv
 }
 
-impl FnType {
-    pub fn new<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
-                         sig: ty::FnSig<'tcx>,
-                         extra_args: &[Ty<'tcx>]) -> FnType {
+impl<'a, 'tcx> FnType<'tcx> {
+    pub fn new(ccx: &CrateContext<'a, 'tcx>,
+               sig: ty::FnSig<'tcx>,
+               extra_args: &[Ty<'tcx>]) -> FnType<'tcx> {
         let mut fn_ty = FnType::unadjusted(ccx, sig, extra_args);
         fn_ty.adjust_for_abi(ccx, sig);
         fn_ty
     }
 
-    pub fn new_vtable<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
-                                sig: ty::FnSig<'tcx>,
-                                extra_args: &[Ty<'tcx>]) -> FnType {
+    pub fn new_vtable(ccx: &CrateContext<'a, 'tcx>,
+                      sig: ty::FnSig<'tcx>,
+                      extra_args: &[Ty<'tcx>]) -> FnType<'tcx> {
         let mut fn_ty = FnType::unadjusted(ccx, sig, extra_args);
         // Don't pass the vtable, it's not an argument of the virtual fn.
         fn_ty.args[1].ignore();
@@ -335,9 +627,9 @@ impl FnType {
         fn_ty
     }
 
-    fn unadjusted<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
-                            sig: ty::FnSig<'tcx>,
-                            extra_args: &[Ty<'tcx>]) -> FnType {
+    pub fn unadjusted(ccx: &CrateContext<'a, 'tcx>,
+                      sig: ty::FnSig<'tcx>,
+                      extra_args: &[Ty<'tcx>]) -> FnType<'tcx> {
         use self::Abi::*;
         let cconv = match ccx.sess().target.target.adjust_abi(sig.abi) {
             RustIntrinsic | PlatformIntrinsic |
@@ -394,23 +686,11 @@ impl FnType {
         };
 
         let arg_of = |ty: Ty<'tcx>, is_return: bool| {
+            let mut arg = ArgType::new(ccx.layout_of(ty));
             if ty.is_bool() {
-                let llty = Type::i1(ccx);
-                let mut arg = ArgType::new(llty, llty);
                 arg.attrs.set(ArgAttribute::ZExt);
-                arg
             } else {
-                let mut arg = ArgType::new(type_of::type_of(ccx, ty),
-                                           type_of::sizing_type_of(ccx, ty));
-                if ty.is_integral() {
-                    arg.signedness = Some(ty.is_signed());
-                }
-                // Rust enum types that map onto C enums also need to follow
-                // the target ABI zero-/sign-extension rules.
-                if let Layout::CEnum { signed, .. } = *ccx.layout_of(ty) {
-                    arg.signedness = Some(signed);
-                }
-                if llsize_of_alloc(ccx, arg.ty) == 0 {
+                if arg.layout.size(ccx).bytes() == 0 {
                     // For some forsaken reason, x86_64-pc-windows-gnu
                     // doesn't ignore zero-sized struct arguments.
                     // The same is true for s390x-unknown-linux-gnu.
@@ -419,8 +699,8 @@ impl FnType {
                         arg.ignore();
                     }
                 }
-                arg
             }
+            arg
         };
 
         let ret_ty = sig.output();
@@ -439,14 +719,10 @@ impl FnType {
             match ret_ty.sty {
                 // These are not really pointers but pairs, (pointer, len)
                 ty::TyRef(_, ty::TypeAndMut { ty, .. }) => {
-                    let llty = type_of::sizing_type_of(ccx, ty);
-                    let llsz = llsize_of_alloc(ccx, llty);
-                    ret.attrs.set_dereferenceable(llsz);
+                    ret.attrs.set_dereferenceable(ccx.size_of(ty));
                 }
                 ty::TyAdt(def, _) if def.is_box() => {
-                    let llty = type_of::sizing_type_of(ccx, ret_ty.boxed_ty());
-                    let llsz = llsize_of_alloc(ccx, llty);
-                    ret.attrs.set_dereferenceable(llsz);
+                    ret.attrs.set_dereferenceable(ccx.size_of(ret_ty.boxed_ty()));
                 }
                 _ => {}
             }
@@ -495,13 +771,9 @@ impl FnType {
         for ty in inputs.iter().chain(extra_args.iter()) {
             let mut arg = arg_of(ty, false);
 
-            if type_is_fat_ptr(ccx, ty) {
-                let original_tys = arg.original_ty.field_types();
-                let sizing_tys = arg.ty.field_types();
-                assert_eq!((original_tys.len(), sizing_tys.len()), (2, 2));
-
-                let mut data = ArgType::new(original_tys[0], sizing_tys[0]);
-                let mut info = ArgType::new(original_tys[1], sizing_tys[1]);
+            if let ty::layout::FatPointer { .. } = *arg.layout {
+                let mut data = ArgType::new(arg.layout.field(ccx, 0));
+                let mut info = ArgType::new(arg.layout.field(ccx, 1));
 
                 if let Some(inner) = rust_ptr_attrs(ty, &mut data) {
                     data.attrs.set(ArgAttribute::NonNull);
@@ -517,9 +789,7 @@ impl FnType {
                 args.push(info);
             } else {
                 if let Some(inner) = rust_ptr_attrs(ty, &mut arg) {
-                    let llty = type_of::sizing_type_of(ccx, inner);
-                    let llsz = llsize_of_alloc(ccx, llty);
-                    arg.attrs.set_dereferenceable(llsz);
+                    arg.attrs.set_dereferenceable(ccx.size_of(inner));
                 }
                 args.push(arg);
             }
@@ -533,43 +803,51 @@ impl FnType {
         }
     }
 
-    fn adjust_for_abi<'a, 'tcx>(&mut self,
-                                ccx: &CrateContext<'a, 'tcx>,
-                                sig: ty::FnSig<'tcx>) {
+    fn adjust_for_abi(&mut self,
+                      ccx: &CrateContext<'a, 'tcx>,
+                      sig: ty::FnSig<'tcx>) {
         let abi = sig.abi;
         if abi == Abi::Unadjusted { return }
 
         if abi == Abi::Rust || abi == Abi::RustCall ||
            abi == Abi::RustIntrinsic || abi == Abi::PlatformIntrinsic {
-            let fixup = |arg: &mut ArgType| {
-                let mut llty = arg.ty;
-
-                // Replace newtypes with their inner-most type.
-                while llty.kind() == llvm::TypeKind::Struct {
-                    let inner = llty.field_types();
-                    if inner.len() != 1 {
-                        break;
-                    }
-                    llty = inner[0];
+            let fixup = |arg: &mut ArgType<'tcx>| {
+                if !arg.layout.is_aggregate() {
+                    return;
                 }
 
-                if !llty.is_aggregate() {
-                    // Scalars and vectors, always immediate.
-                    if llty != arg.ty {
+                let size = arg.layout.size(ccx);
+
+                if let Some(unit) = arg.layout.homogenous_aggregate(ccx) {
+                    // Replace newtypes with their inner-most type.
+                    if unit.size == size {
                         // Needs a cast as we've unpacked a newtype.
-                        arg.cast = Some(llty);
+                        arg.cast_to(ccx, unit);
+                        return;
+                    }
+
+                    // Pairs of floats.
+                    if unit.kind == RegKind::Float {
+                        if unit.size.checked_mul(2, ccx) == Some(size) {
+                            // FIXME(eddyb) This should be using Uniform instead of a pair,
+                            // but the resulting [2 x float/double] breaks emscripten.
+                            // See https://github.com/kripken/emscripten-fastcomp/issues/178.
+                            arg.cast_to(ccx, CastTarget::Pair(unit, unit));
+                            return;
+                        }
                     }
-                    return;
                 }
 
-                let size = llsize_of_alloc(ccx, llty);
-                if size > llsize_of_alloc(ccx, ccx.int_type()) {
+                if size > layout::Pointer.size(ccx) {
                     arg.make_indirect(ccx);
-                } else if size > 0 {
+                } else {
                     // We want to pass small aggregates as immediates, but using
                     // a LLVM aggregate type for this leads to bad optimizations,
                     // so we pick an appropriately sized integer type instead.
-                    arg.cast = Some(Type::ix(ccx, size * 8));
+                    arg.cast_to(ccx, Reg {
+                        kind: RegKind::Integer,
+                        size
+                    });
                 }
             };
             // Fat pointers are returned by-value.
@@ -605,14 +883,7 @@ impl FnType {
                 cabi_x86_64::compute_abi_info(ccx, self);
             },
             "aarch64" => cabi_aarch64::compute_abi_info(ccx, self),
-            "arm" => {
-                let flavor = if ccx.sess().target.target.target_os == "ios" {
-                    cabi_arm::Flavor::Ios
-                } else {
-                    cabi_arm::Flavor::General
-                };
-                cabi_arm::compute_abi_info(ccx, self, flavor);
-            },
+            "arm" => cabi_arm::compute_abi_info(ccx, self),
             "mips" => cabi_mips::compute_abi_info(ccx, self),
             "mips64" => cabi_mips64::compute_abi_info(ccx, self),
             "powerpc" => cabi_powerpc::compute_abi_info(ccx, self),
@@ -633,16 +904,18 @@ impl FnType {
         }
     }
 
-    pub fn llvm_type(&self, ccx: &CrateContext) -> Type {
+    pub fn llvm_type(&self, ccx: &CrateContext<'a, 'tcx>) -> Type {
         let mut llargument_tys = Vec::new();
 
         let llreturn_ty = if self.ret.is_ignore() {
             Type::void(ccx)
         } else if self.ret.is_indirect() {
-            llargument_tys.push(self.ret.original_ty.ptr_to());
+            llargument_tys.push(self.ret.memory_ty(ccx).ptr_to());
             Type::void(ccx)
         } else {
-            self.ret.cast.unwrap_or(self.ret.original_ty)
+            self.ret.cast.unwrap_or_else(|| {
+                type_of::immediate_type_of(ccx, self.ret.layout.ty)
+            })
         };
 
         for arg in &self.args {
@@ -655,9 +928,11 @@ impl FnType {
             }
 
             let llarg_ty = if arg.is_indirect() {
-                arg.original_ty.ptr_to()
+                arg.memory_ty(ccx).ptr_to()
             } else {
-                arg.cast.unwrap_or(arg.original_ty)
+                arg.cast.unwrap_or_else(|| {
+                    type_of::immediate_type_of(ccx, arg.layout.ty)
+                })
             };
 
             llargument_tys.push(llarg_ty);
@@ -705,72 +980,6 @@ impl FnType {
     }
 }
 
-pub fn align_up_to(off: usize, a: usize) -> usize {
-    return (off + a - 1) / a * a;
-}
-
-fn align(off: usize, ty: Type, pointer: usize) -> usize {
-    let a = ty_align(ty, pointer);
-    return align_up_to(off, a);
-}
-
-pub fn ty_align(ty: Type, pointer: usize) -> usize {
-    match ty.kind() {
-        Integer => ((ty.int_width() as usize) + 7) / 8,
-        Pointer => pointer,
-        Float => 4,
-        Double => 8,
-        Struct => {
-            if ty.is_packed() {
-                1
-            } else {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(1, |a, t| cmp::max(a, ty_align(*t, pointer)))
-            }
-        }
-        Array => {
-            let elt = ty.element_type();
-            ty_align(elt, pointer)
-        }
-        Vector => {
-            let len = ty.vector_length();
-            let elt = ty.element_type();
-            ty_align(elt, pointer) * len
-        }
-        _ => bug!("ty_align: unhandled type")
-    }
-}
-
-pub fn ty_size(ty: Type, pointer: usize) -> usize {
-    match ty.kind() {
-        Integer => ((ty.int_width() as usize) + 7) / 8,
-        Pointer => pointer,
-        Float => 4,
-        Double => 8,
-        Struct => {
-            if ty.is_packed() {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(0, |s, t| s + ty_size(*t, pointer))
-            } else {
-                let str_tys = ty.field_types();
-                let size = str_tys.iter().fold(0, |s, t| {
-                    align(s, *t, pointer) + ty_size(*t, pointer)
-                });
-                align(size, ty, pointer)
-            }
-        }
-        Array => {
-            let len = ty.array_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt, pointer);
-            len * eltsz
-        }
-        Vector => {
-            let len = ty.vector_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt, pointer);
-            len * eltsz
-        },
-        _ => bug!("ty_size: unhandled type")
-    }
+pub fn align_up_to(off: u64, a: u64) -> u64 {
+    (off + a - 1) / a * a
 }
diff --git a/src/librustc_trans/adt.rs b/src/librustc_trans/adt.rs
index 5c1ced57340..0fe180253b5 100644
--- a/src/librustc_trans/adt.rs
+++ b/src/librustc_trans/adt.rs
@@ -46,8 +46,8 @@ use super::Disr;
 use std;
 
 use llvm::{ValueRef, True, IntEQ, IntNE};
-use rustc::ty::layout;
-use rustc::ty::{self, Ty, AdtKind};
+use rustc::ty::{self, Ty};
+use rustc::ty::layout::{self, LayoutTyper};
 use common::*;
 use builder::Builder;
 use base;
@@ -95,15 +95,6 @@ pub fn type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>) -> Type {
     generic_type_of(cx, t, None, false, false)
 }
 
-
-// Pass dst=true if the type you are passing is a DST. Yes, we could figure
-// this out, but if you call this on an unsized type without realising it, you
-// are going to get the wrong type (it will not include the unsized parts of it).
-pub fn sizing_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
-                                t: Ty<'tcx>, dst: bool) -> Type {
-    generic_type_of(cx, t, None, true, dst)
-}
-
 pub fn incomplete_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
                                     t: Ty<'tcx>, name: &str) -> Type {
     generic_type_of(cx, t, Some(name), false, false)
@@ -149,7 +140,11 @@ fn generic_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
             };
             let nnty = monomorphize::field_ty(cx.tcx(), substs,
                 &def.variants[nndiscr as usize].fields[0]);
-            type_of::sizing_type_of(cx, nnty)
+            if let layout::Scalar { value: layout::Pointer, .. } = *cx.layout_of(nnty) {
+                Type::i8p(cx)
+            } else {
+                type_of::type_of(cx, nnty)
+            }
         }
         layout::StructWrappedNullablePointer { nndiscr, ref nonnull, .. } => {
             let fields = compute_fields(cx, t, nndiscr as usize, false);
@@ -181,10 +176,6 @@ fn generic_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
                 }
             }
         }
-        layout::Vector { element, count } => {
-            let elem_ty = Type::from_primitive(cx, element);
-            Type::vector(&elem_ty, count)
-        }
         layout::UntaggedUnion { ref variants, .. }=> {
             // Use alignment-sized ints to fill all the union storage.
             let size = variants.stride().bytes();
@@ -246,9 +237,8 @@ fn union_fill(cx: &CrateContext, size: u64, align: u64) -> Type {
     assert_eq!(size%align, 0);
     assert_eq!(align.count_ones(), 1, "Alignment must be a power fof 2. Got {}", align);
     let align_units = size/align;
-    let dl = &cx.tcx().data_layout;
     let layout_align = layout::Align::from_bytes(align, align).unwrap();
-    if let Some(ity) = layout::Integer::for_abi_align(dl, layout_align) {
+    if let Some(ity) = layout::Integer::for_abi_align(cx, layout_align) {
         Type::array(&Type::from_integer(cx, ity), align_units)
     } else {
         Type::array(&Type::vector(&Type::i32(cx), align/4),
@@ -259,11 +249,10 @@ fn union_fill(cx: &CrateContext, size: u64, align: u64) -> Type {
 
 fn struct_llfields<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, fields: &Vec<Ty<'tcx>>,
                              variant: &layout::Struct,
-                             sizing: bool, dst: bool) -> Vec<Type> {
+                             sizing: bool, _dst: bool) -> Vec<Type> {
     let fields = variant.field_index_by_increasing_offset().map(|i| fields[i as usize]);
     if sizing {
-        fields.filter(|ty| !dst || cx.shared().type_is_sized(*ty))
-            .map(|ty| type_of::sizing_type_of(cx, ty)).collect()
+        bug!()
     } else {
         fields.map(|ty| type_of::in_memory_type_of(cx, ty)).collect()
     }
@@ -285,11 +274,6 @@ pub fn trans_get_discr<'a, 'tcx>(
     cast_to: Option<Type>,
     range_assert: bool
 ) -> ValueRef {
-    let (def, substs) = match t.sty {
-        ty::TyAdt(ref def, substs) if def.adt_kind() == AdtKind::Enum => (def, substs),
-        _ => bug!("{} is not an enum", t)
-    };
-
     debug!("trans_get_discr t: {:?}", t);
     let l = bcx.ccx.layout_of(t);
 
@@ -297,19 +281,17 @@ pub fn trans_get_discr<'a, 'tcx>(
         layout::CEnum { discr, min, max, .. } => {
             load_discr(bcx, discr, scrutinee, alignment, min, max, range_assert)
         }
-        layout::General { discr, .. } => {
+        layout::General { discr, ref variants, .. } => {
             let ptr = bcx.struct_gep(scrutinee, 0);
             load_discr(bcx, discr, ptr, alignment,
-                       0, def.variants.len() as u64 - 1,
+                       0, variants.len() as u64 - 1,
                        range_assert)
         }
         layout::Univariant { .. } | layout::UntaggedUnion { .. } => C_u8(bcx.ccx, 0),
         layout::RawNullablePointer { nndiscr, .. } => {
             let cmp = if nndiscr == 0 { IntEQ } else { IntNE };
-            let llptrty = type_of::sizing_type_of(bcx.ccx,
-                monomorphize::field_ty(bcx.tcx(), substs,
-                &def.variants[nndiscr as usize].fields[0]));
-            bcx.icmp(cmp, bcx.load(scrutinee, alignment.to_align()), C_null(llptrty))
+            let discr = bcx.load(scrutinee, alignment.to_align());
+            bcx.icmp(cmp, discr, C_null(val_ty(discr)))
         }
         layout::StructWrappedNullablePointer { nndiscr, ref discrfield, .. } => {
             struct_wrapped_nullable_bitdiscr(bcx, nndiscr, discrfield, scrutinee, alignment)
@@ -383,9 +365,8 @@ pub fn trans_set_discr<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, val: Valu
             assert_eq!(to, Disr(0));
         }
         layout::RawNullablePointer { nndiscr, .. } => {
-            let nnty = compute_fields(bcx.ccx, t, nndiscr as usize, false)[0];
             if to.0 != nndiscr {
-                let llptrty = type_of::sizing_type_of(bcx.ccx, nnty);
+                let llptrty = val_ty(val).element_type();
                 bcx.store(C_null(llptrty), val, None);
             }
         }
diff --git a/src/librustc_trans/base.rs b/src/librustc_trans/base.rs
index d204703b775..574b345218b 100644
--- a/src/librustc_trans/base.rs
+++ b/src/librustc_trans/base.rs
@@ -59,7 +59,6 @@ use context::{SharedCrateContext, CrateContextList};
 use debuginfo;
 use declare;
 use machine;
-use machine::llsize_of;
 use meth;
 use mir;
 use monomorphize::{self, Instance};
@@ -534,14 +533,13 @@ pub fn memcpy_ty<'a, 'tcx>(
 ) {
     let ccx = bcx.ccx;
 
-    if type_is_zero_size(ccx, t) {
+    let size = ccx.size_of(t);
+    if size == 0 {
         return;
     }
 
-    let llty = type_of::type_of(ccx, t);
-    let llsz = llsize_of(ccx, llty);
-    let llalign = align.unwrap_or_else(|| type_of::align_of(ccx, t));
-    call_memcpy(bcx, dst, src, llsz, llalign as u32);
+    let align = align.unwrap_or_else(|| ccx.align_of(t));
+    call_memcpy(bcx, dst, src, C_uint(ccx, size), align);
 }
 
 pub fn call_memset<'a, 'tcx>(b: &Builder<'a, 'tcx>,
@@ -1297,8 +1295,8 @@ fn gather_type_sizes<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
         // (delay format until we actually need it)
         let record = |kind, opt_discr_size, variants| {
             let type_desc = format!("{:?}", ty);
-            let overall_size = layout.size(&tcx.data_layout);
-            let align = layout.align(&tcx.data_layout);
+            let overall_size = layout.size(tcx);
+            let align = layout.align(tcx);
             tcx.sess.code_stats.borrow_mut().record_type_size(kind,
                                                               type_desc,
                                                               align,
@@ -1334,8 +1332,8 @@ fn gather_type_sizes<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
                     session::FieldInfo {
                         name: field_name.to_string(),
                         offset: offset.bytes(),
-                        size: field_layout.size(&tcx.data_layout).bytes(),
-                        align: field_layout.align(&tcx.data_layout).abi(),
+                        size: field_layout.size(tcx).bytes(),
+                        align: field_layout.align(tcx).abi(),
                     }
                 }
             }
@@ -1345,8 +1343,8 @@ fn gather_type_sizes<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
             session::VariantInfo {
                 name: Some(name.to_string()),
                 kind: session::SizeKind::Exact,
-                align: value.align(&tcx.data_layout).abi(),
-                size: value.size(&tcx.data_layout).bytes(),
+                align: value.align(tcx).abi(),
+                size: value.size(tcx).bytes(),
                 fields: vec![],
             }
         };
diff --git a/src/librustc_trans/cabi_aarch64.rs b/src/librustc_trans/cabi_aarch64.rs
index 59a84439950..c8c5af714d9 100644
--- a/src/librustc_trans/cabi_aarch64.rs
+++ b/src/librustc_trans/cabi_aarch64.rs
@@ -8,163 +8,99 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![allow(non_upper_case_globals)]
-
-use llvm::{Integer, Pointer, Float, Double, Struct, Array, Vector};
-use abi::{self, FnType, ArgType};
+use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 8)
-}
-
-fn is_homogenous_aggregate_ty(ty: Type) -> Option<(Type, u64)> {
-    fn check_array(ty: Type) -> Option<(Type, u64)> {
-        let len = ty.array_length() as u64;
-        if len == 0 {
-            return None
-        }
-        let elt = ty.element_type();
-
-        // if our element is an HFA/HVA, so are we; multiply members by our len
-        is_homogenous_aggregate_ty(elt).map(|(base_ty, members)| (base_ty, len * members))
-    }
-
-    fn check_struct(ty: Type) -> Option<(Type, u64)> {
-        let str_tys = ty.field_types();
-        if str_tys.len() == 0 {
-            return None
-        }
-
-        let mut prev_base_ty = None;
-        let mut members = 0;
-        for opt_homog_agg in str_tys.iter().map(|t| is_homogenous_aggregate_ty(*t)) {
-            match (prev_base_ty, opt_homog_agg) {
-                // field isn't itself an HFA, so we aren't either
-                (_, None) => return None,
-
-                // first field - store its type and number of members
-                (None, Some((field_ty, field_members))) => {
-                    prev_base_ty = Some(field_ty);
-                    members = field_members;
-                },
 
-                // 2nd or later field - give up if it's a different type; otherwise incr. members
-                (Some(prev_ty), Some((field_ty, field_members))) => {
-                    if prev_ty != field_ty {
-                        return None;
-                    }
-                    members += field_members;
-                }
-            }
-        }
-
-        // Because of previous checks, we know prev_base_ty is Some(...) because
-        //   1. str_tys has at least one element; and
-        //   2. prev_base_ty was filled in (or we would've returned early)
-        let (base_ty, members) = (prev_base_ty.unwrap(), members);
+fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>)
+                                     -> Option<Uniform> {
+    arg.layout.homogenous_aggregate(ccx).and_then(|unit| {
+        let size = arg.layout.size(ccx);
 
-        // Ensure there is no padding.
-        if ty_size(ty) == ty_size(base_ty) * (members as usize) {
-            Some((base_ty, members))
-        } else {
-            None
+        // Ensure we have at most four uniquely addressable members.
+        if size > unit.size.checked_mul(4, ccx).unwrap() {
+            return None;
         }
-    }
 
-    let homog_agg = match ty.kind() {
-        Float  => Some((ty, 1)),
-        Double => Some((ty, 1)),
-        Array  => check_array(ty),
-        Struct => check_struct(ty),
-        Vector => match ty_size(ty) {
-            4|8 => Some((ty, 1)),
-            _   => None
-        },
-        _ => None
-    };
+        let valid_unit = match unit.kind {
+            RegKind::Integer => false,
+            RegKind::Float => true,
+            RegKind::Vector => size.bits() == 64 || size.bits() == 128
+        };
 
-    // Ensure we have at most four uniquely addressable members
-    homog_agg.and_then(|(base_ty, members)| {
-        if members > 0 && members <= 4 {
-            Some((base_ty, members))
+        if valid_unit {
+            Some(Uniform {
+                unit,
+                total: size
+            })
         } else {
             None
         }
     })
 }
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
         return;
     }
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(ret.ty) {
-        ret.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, ret) {
+        ret.cast_to(ccx, uniform);
         return;
     }
-    let size = ty_size(ret.ty);
-    if size <= 16 {
-        let llty = if size <= 1 {
-            Type::i8(ccx)
-        } else if size <= 2 {
-            Type::i16(ccx)
-        } else if size <= 4 {
-            Type::i32(ccx)
-        } else if size <= 8 {
-            Type::i64(ccx)
+    let size = ret.layout.size(ccx);
+    let bits = size.bits();
+    if bits <= 128 {
+        let unit = if bits <= 8 {
+            Reg::i8()
+        } else if bits <= 16 {
+            Reg::i16()
+        } else if bits <= 32 {
+            Reg::i32()
         } else {
-            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+            Reg::i64()
         };
-        ret.cast = Some(llty);
+
+        ret.cast_to(ccx, Uniform {
+            unit,
+            total: size
+        });
         return;
     }
     ret.make_indirect(ccx);
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if is_reg_ty(arg.ty) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if !arg.layout.is_aggregate() {
         arg.extend_integer_width_to(32);
         return;
     }
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(arg.ty) {
-        arg.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, arg) {
+        arg.cast_to(ccx, uniform);
         return;
     }
-    let size = ty_size(arg.ty);
-    if size <= 16 {
-        let llty = if size == 0 {
-            Type::array(&Type::i64(ccx), 0)
-        } else if size == 1 {
-            Type::i8(ccx)
-        } else if size == 2 {
-            Type::i16(ccx)
-        } else if size <= 4 {
-            Type::i32(ccx)
-        } else if size <= 8 {
-            Type::i64(ccx)
+    let size = arg.layout.size(ccx);
+    let bits = size.bits();
+    if bits <= 128 {
+        let unit = if bits <= 8 {
+            Reg::i8()
+        } else if bits <= 16 {
+            Reg::i16()
+        } else if bits <= 32 {
+            Reg::i32()
         } else {
-            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+            Reg::i64()
         };
-        arg.cast = Some(llty);
+
+        arg.cast_to(ccx, Uniform {
+            unit,
+            total: size
+        });
         return;
     }
     arg.make_indirect(ccx);
 }
 
-fn is_reg_ty(ty: Type) -> bool {
-    match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double
-        | Vector => true,
-        _ => false
-    }
-}
-
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_arm.rs b/src/librustc_trans/cabi_arm.rs
index 85b26074bae..7a91cad511d 100644
--- a/src/librustc_trans/cabi_arm.rs
+++ b/src/librustc_trans/cabi_arm.rs
@@ -8,156 +8,53 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use llvm::{Integer, Pointer, Float, Double, Struct, Array, Vector};
-use abi::{self, align_up_to, FnType, ArgType};
+use abi::{FnType, ArgType, LayoutExt, Reg, Uniform};
 use context::CrateContext;
-use type_::Type;
 
-use std::cmp;
-
-pub enum Flavor {
-    General,
-    Ios
-}
-
-type TyAlignFn = fn(ty: Type) -> usize;
-
-fn align(off: usize, ty: Type, align_fn: TyAlignFn) -> usize {
-    let a = align_fn(ty);
-    return align_up_to(off, a);
-}
-
-fn general_ty_align(ty: Type) -> usize {
-    abi::ty_align(ty, 4)
-}
-
-// For more information see:
-// ARMv7
-// https://developer.apple.com/library/ios/documentation/Xcode/Conceptual
-//    /iPhoneOSABIReference/Articles/ARMv7FunctionCallingConventions.html
-// ARMv6
-// https://developer.apple.com/library/ios/documentation/Xcode/Conceptual
-//    /iPhoneOSABIReference/Articles/ARMv6FunctionCallingConventions.html
-fn ios_ty_align(ty: Type) -> usize {
-    match ty.kind() {
-        Integer => cmp::min(4, ((ty.int_width() as usize) + 7) / 8),
-        Pointer => 4,
-        Float => 4,
-        Double => 4,
-        Struct => {
-            if ty.is_packed() {
-                1
-            } else {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(1, |a, t| cmp::max(a, ios_ty_align(*t)))
-            }
-        }
-        Array => {
-            let elt = ty.element_type();
-            ios_ty_align(elt)
-        }
-        Vector => {
-            let len = ty.vector_length();
-            let elt = ty.element_type();
-            ios_ty_align(elt) * len
-        }
-        _ => bug!("ty_align: unhandled type")
-    }
-}
-
-fn ty_size(ty: Type, align_fn: TyAlignFn) -> usize {
-    match ty.kind() {
-        Integer => ((ty.int_width() as usize) + 7) / 8,
-        Pointer => 4,
-        Float => 4,
-        Double => 8,
-        Struct => {
-            if ty.is_packed() {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(0, |s, t| s + ty_size(*t, align_fn))
-            } else {
-                let str_tys = ty.field_types();
-                let size = str_tys.iter()
-                                  .fold(0, |s, t| {
-                                      align(s, *t, align_fn) + ty_size(*t, align_fn)
-                                  });
-                align(size, ty, align_fn)
-            }
-        }
-        Array => {
-            let len = ty.array_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt, align_fn);
-            len * eltsz
-        }
-        Vector => {
-            let len = ty.vector_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt, align_fn);
-            len * eltsz
-        }
-        _ => bug!("ty_size: unhandled type")
-    }
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType, align_fn: TyAlignFn) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
         return;
     }
-    let size = ty_size(ret.ty, align_fn);
-    if size <= 4 {
-        let llty = if size <= 1 {
-            Type::i8(ccx)
-        } else if size <= 2 {
-            Type::i16(ccx)
+    let size = ret.layout.size(ccx);
+    let bits = size.bits();
+    if bits <= 32 {
+        let unit = if bits <= 8 {
+            Reg::i8()
+        } else if bits <= 16 {
+            Reg::i16()
         } else {
-            Type::i32(ccx)
+            Reg::i32()
         };
-        ret.cast = Some(llty);
+        ret.cast_to(ccx, Uniform {
+            unit,
+            total: size
+        });
         return;
     }
     ret.make_indirect(ccx);
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, align_fn: TyAlignFn) {
-    if is_reg_ty(arg.ty) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if !arg.layout.is_aggregate() {
         arg.extend_integer_width_to(32);
         return;
     }
-    let align = align_fn(arg.ty);
-    let size = ty_size(arg.ty, align_fn);
-    let llty = if align <= 4 {
-        Type::array(&Type::i32(ccx), ((size + 3) / 4) as u64)
-    } else {
-        Type::array(&Type::i64(ccx), ((size + 7) / 8) as u64)
-    };
-    arg.cast = Some(llty);
+    let align = arg.layout.align(ccx).abi();
+    let total = arg.layout.size(ccx);
+    arg.cast_to(ccx, Uniform {
+        unit: if align <= 4 { Reg::i32() } else { Reg::i64() },
+        total
+    });
 }
 
-fn is_reg_ty(ty: Type) -> bool {
-    match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double
-        | Vector => true,
-        _ => false
-    }
-}
-
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
-    let align_fn = match flavor {
-        Flavor::General => general_ty_align as TyAlignFn,
-        Flavor::Ios => ios_ty_align as TyAlignFn,
-    };
-
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
-        classify_ret_ty(ccx, &mut fty.ret, align_fn);
+        classify_ret_ty(ccx, &mut fty.ret);
     }
 
     for arg in &mut fty.args {
         if arg.is_ignore() { continue; }
-        classify_arg_ty(ccx, arg, align_fn);
+        classify_arg_ty(ccx, arg);
     }
 }
diff --git a/src/librustc_trans/cabi_asmjs.rs b/src/librustc_trans/cabi_asmjs.rs
index f410627400c..f05dda8bce2 100644
--- a/src/librustc_trans/cabi_asmjs.rs
+++ b/src/librustc_trans/cabi_asmjs.rs
@@ -8,10 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![allow(non_upper_case_globals)]
-
-use llvm::{Struct, Array};
-use abi::{FnType, ArgType, ArgAttribute};
+use abi::{FnType, ArgType, ArgAttribute, LayoutExt, Uniform};
 use context::CrateContext;
 
 // Data layout: e-p:32:32-i64:64-v128:32:128-n32-S128
@@ -19,31 +16,31 @@ use context::CrateContext;
 // See the https://github.com/kripken/emscripten-fastcomp-clang repository.
 // The class `EmscriptenABIInfo` in `/lib/CodeGen/TargetInfo.cpp` contains the ABI definitions.
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    match ret.ty.kind() {
-        Struct => {
-            let field_types = ret.ty.field_types();
-            if field_types.len() == 1 {
-                ret.cast = Some(field_types[0]);
-            } else {
-                ret.make_indirect(ccx);
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if ret.layout.is_aggregate() {
+        if let Some(unit) = ret.layout.homogenous_aggregate(ccx) {
+            let size = ret.layout.size(ccx);
+            if unit.size == size {
+                ret.cast_to(ccx, Uniform {
+                    unit,
+                    total: size
+                });
+                return;
             }
         }
-        Array => {
-            ret.make_indirect(ccx);
-        }
-        _ => {}
+
+        ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if arg.ty.is_aggregate() {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if arg.layout.is_aggregate() {
         arg.make_indirect(ccx);
         arg.attrs.set(ArgAttribute::ByVal);
     }
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_mips.rs b/src/librustc_trans/cabi_mips.rs
index 25fe53e7ef4..b7b60859d4a 100644
--- a/src/librustc_trans/cabi_mips.rs
+++ b/src/librustc_trans/cabi_mips.rs
@@ -8,94 +8,40 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![allow(non_upper_case_globals)]
-
-use libc::c_uint;
 use std::cmp;
-use llvm;
-use llvm::{Integer, Pointer, Float, Double, Vector};
-use abi::{self, align_up_to, ArgType, FnType};
+use abi::{align_up_to, ArgType, FnType, LayoutExt, Reg, Uniform};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_align(ty: Type) -> usize {
-    abi::ty_align(ty, 4)
-}
 
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 4)
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
     } else {
         ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
-    let orig_offset = *offset;
-    let size = ty_size(arg.ty) * 8;
-    let mut align = ty_align(arg.ty);
-
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
+    let size = arg.layout.size(ccx);
+    let mut align = arg.layout.align(ccx).abi();
     align = cmp::min(cmp::max(align, 4), 8);
-    *offset = align_up_to(*offset, align);
-    *offset += align_up_to(size, align * 8) / 8;
 
-    if !is_reg_ty(arg.ty) {
-        arg.cast = Some(struct_ty(ccx, arg.ty));
-        arg.pad = padding_ty(ccx, align, orig_offset);
+    if arg.layout.is_aggregate() {
+        arg.cast_to(ccx, Uniform {
+            unit: Reg::i32(),
+            total: size
+        });
+        if ((align - 1) & *offset) > 0 {
+            arg.pad_with(ccx, Reg::i32());
+        }
     } else {
         arg.extend_integer_width_to(32);
     }
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    return match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double
-        | Vector => true,
-        _ => false
-    };
-}
-
-fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
-    if ((align - 1 ) & offset) > 0 {
-        Some(Type::i32(ccx))
-    } else {
-        None
-    }
-}
-
-fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let int_ty = Type::i32(ccx);
-    let mut args = Vec::new();
-
-    let mut n = size / 32;
-    while n > 0 {
-        args.push(int_ty);
-        n -= 1;
-    }
 
-    let r = size % 32;
-    if r > 0 {
-        unsafe {
-            args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
-        }
-    }
-
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_int(ccx, size), false)
+    *offset = align_up_to(*offset, align);
+    *offset += align_up_to(size.bytes(), align);
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_mips64.rs b/src/librustc_trans/cabi_mips64.rs
index e6b500c88dc..dff75e628de 100644
--- a/src/librustc_trans/cabi_mips64.rs
+++ b/src/librustc_trans/cabi_mips64.rs
@@ -8,94 +8,40 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![allow(non_upper_case_globals)]
-
-use libc::c_uint;
 use std::cmp;
-use llvm;
-use llvm::{Integer, Pointer, Float, Double, Vector};
-use abi::{self, align_up_to, ArgType, FnType};
+use abi::{align_up_to, ArgType, FnType, LayoutExt, Reg, Uniform};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_align(ty: Type) -> usize {
-    abi::ty_align(ty, 8)
-}
 
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 8)
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(64);
     } else {
         ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
-    let orig_offset = *offset;
-    let size = ty_size(arg.ty) * 8;
-    let mut align = ty_align(arg.ty);
-
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
+    let size = arg.layout.size(ccx);
+    let mut align = arg.layout.align(ccx).abi();
     align = cmp::min(cmp::max(align, 4), 8);
-    *offset = align_up_to(*offset, align);
-    *offset += align_up_to(size, align * 8) / 8;
 
-    if !is_reg_ty(arg.ty) {
-        arg.cast = Some(struct_ty(ccx, arg.ty));
-        arg.pad = padding_ty(ccx, align, orig_offset);
+    if arg.layout.is_aggregate() {
+        arg.cast_to(ccx, Uniform {
+            unit: Reg::i64(),
+            total: size
+        });
+        if ((align - 1) & *offset) > 0 {
+            arg.pad_with(ccx, Reg::i64());
+        }
     } else {
         arg.extend_integer_width_to(64);
     }
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    return match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double
-        | Vector => true,
-        _ => false
-    };
-}
-
-fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
-    if ((align - 1 ) & offset) > 0 {
-        Some(Type::i64(ccx))
-    } else {
-        None
-    }
-}
-
-fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let int_ty = Type::i64(ccx);
-    let mut args = Vec::new();
-
-    let mut n = size / 64;
-    while n > 0 {
-        args.push(int_ty);
-        n -= 1;
-    }
 
-    let r = size % 64;
-    if r > 0 {
-        unsafe {
-            args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
-        }
-    }
-
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_int(ccx, size), false)
+    *offset = align_up_to(*offset, align);
+    *offset += align_up_to(size.bytes(), align);
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_msp430.rs b/src/librustc_trans/cabi_msp430.rs
index aa90bb7ab75..546bb5ad9b4 100644
--- a/src/librustc_trans/cabi_msp430.rs
+++ b/src/librustc_trans/cabi_msp430.rs
@@ -11,17 +11,8 @@
 // Reference: MSP430 Embedded Application Binary Interface
 // http://www.ti.com/lit/an/slaa534/slaa534.pdf
 
-#![allow(non_upper_case_globals)]
-
-use llvm::Struct;
-
-use abi::{self, ArgType, FnType};
+use abi::{ArgType, FnType, LayoutExt};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 2)
-}
 
 // 3.5 Structures or Unions Passed and Returned by Reference
 //
@@ -29,23 +20,23 @@ fn ty_size(ty: Type) -> usize {
 // returned by reference. To pass a structure or union by reference, the caller
 // places its address in the appropriate location: either in a register or on
 // the stack, according to its position in the argument list. (..)"
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if ret.layout.is_aggregate() && ret.layout.size(ccx).bits() > 32 {
         ret.make_indirect(ccx);
     } else {
         ret.extend_integer_width_to(16);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if arg.layout.is_aggregate() && arg.layout.size(ccx).bits() > 32 {
         arg.make_indirect(ccx);
     } else {
         arg.extend_integer_width_to(16);
     }
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_nvptx.rs b/src/librustc_trans/cabi_nvptx.rs
index 5ece19f764a..3873752b254 100644
--- a/src/librustc_trans/cabi_nvptx.rs
+++ b/src/librustc_trans/cabi_nvptx.rs
@@ -11,35 +11,26 @@
 // Reference: PTX Writer's Guide to Interoperability
 // http://docs.nvidia.com/cuda/ptx-writers-guide-to-interoperability
 
-#![allow(non_upper_case_globals)]
-
-use llvm::Struct;
-
-use abi::{self, ArgType, FnType};
+use abi::{ArgType, FnType, LayoutExt};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 4)
-}
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if ret.ty.kind() == Struct && ty_size(ret.ty) > 32 {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if ret.layout.is_aggregate() && ret.layout.size(ccx).bits() > 32 {
         ret.make_indirect(ccx);
     } else {
         ret.extend_integer_width_to(32);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if arg.ty.kind() == Struct && ty_size(arg.ty) > 32 {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if arg.layout.is_aggregate() && arg.layout.size(ccx).bits() > 32 {
         arg.make_indirect(ccx);
     } else {
         arg.extend_integer_width_to(32);
     }
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_nvptx64.rs b/src/librustc_trans/cabi_nvptx64.rs
index 880c6cfd7a8..24bf4920c16 100644
--- a/src/librustc_trans/cabi_nvptx64.rs
+++ b/src/librustc_trans/cabi_nvptx64.rs
@@ -11,35 +11,26 @@
 // Reference: PTX Writer's Guide to Interoperability
 // http://docs.nvidia.com/cuda/ptx-writers-guide-to-interoperability
 
-#![allow(non_upper_case_globals)]
-
-use llvm::Struct;
-
-use abi::{self, ArgType, FnType};
+use abi::{ArgType, FnType, LayoutExt};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 8)
-}
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if ret.ty.kind() == Struct && ty_size(ret.ty) > 64 {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if ret.layout.is_aggregate() && ret.layout.size(ccx).bits() > 64 {
         ret.make_indirect(ccx);
     } else {
         ret.extend_integer_width_to(64);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if arg.ty.kind() == Struct && ty_size(arg.ty) > 64 {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if arg.layout.is_aggregate() && arg.layout.size(ccx).bits() > 64 {
         arg.make_indirect(ccx);
     } else {
         arg.extend_integer_width_to(64);
     }
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_powerpc.rs b/src/librustc_trans/cabi_powerpc.rs
index 4e1d7a93378..f951ac76391 100644
--- a/src/librustc_trans/cabi_powerpc.rs
+++ b/src/librustc_trans/cabi_powerpc.rs
@@ -8,100 +8,41 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use libc::c_uint;
-use llvm;
-use llvm::{Integer, Pointer, Float, Double, Vector};
-use abi::{self, align_up_to, FnType, ArgType};
+use abi::{align_up_to, FnType, ArgType, LayoutExt, Reg, Uniform};
 use context::CrateContext;
-use type_::Type;
 
 use std::cmp;
 
-fn ty_align(ty: Type) -> usize {
-    if ty.kind() == Vector {
-        bug!("ty_size: unhandled type")
-    } else {
-        abi::ty_align(ty, 4)
-    }
-}
-
-fn ty_size(ty: Type) -> usize {
-    if ty.kind() == Vector {
-        bug!("ty_size: unhandled type")
-    } else {
-        abi::ty_size(ty, 4)
-    }
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
     } else {
         ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
-    let orig_offset = *offset;
-    let size = ty_size(arg.ty) * 8;
-    let mut align = ty_align(arg.ty);
-
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
+    let size = arg.layout.size(ccx);
+    let mut align = arg.layout.align(ccx).abi();
     align = cmp::min(cmp::max(align, 4), 8);
-    *offset = align_up_to(*offset, align);
-    *offset += align_up_to(size, align * 8) / 8;
 
-    if !is_reg_ty(arg.ty) {
-        arg.cast = Some(struct_ty(ccx, arg.ty));
-        arg.pad = padding_ty(ccx, align, orig_offset);
+    if arg.layout.is_aggregate() {
+        arg.cast_to(ccx, Uniform {
+            unit: Reg::i32(),
+            total: size
+        });
+        if ((align - 1) & *offset) > 0 {
+            arg.pad_with(ccx, Reg::i32());
+        }
     } else {
         arg.extend_integer_width_to(32);
     }
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    return match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double => true,
-        _ => false
-    };
-}
 
-fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
-    if ((align - 1 ) & offset) > 0 {
-        Some(Type::i32(ccx))
-    } else {
-        None
-    }
-}
-
-fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let int_ty = Type::i32(ccx);
-    let mut args = Vec::new();
-
-    let mut n = size / 32;
-    while n > 0 {
-        args.push(int_ty);
-        n -= 1;
-    }
-
-    let r = size % 32;
-    if r > 0 {
-        unsafe {
-            args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
-        }
-    }
-
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_int(ccx, size), false)
+    *offset = align_up_to(*offset, align);
+    *offset += align_up_to(size.bytes(), align);
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_powerpc64.rs b/src/librustc_trans/cabi_powerpc64.rs
index cdc7c1fd1af..c4f8d0b4b96 100644
--- a/src/librustc_trans/cabi_powerpc64.rs
+++ b/src/librustc_trans/cabi_powerpc64.rs
@@ -8,100 +8,42 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// FIXME: The PowerPC64 ABI needs to zero or sign extend function
-// call parameters, but compute_abi_info() is passed LLVM types
-// which have no sign information.
-//
+// FIXME:
 // Alignment of 128 bit types is not currently handled, this will
 // need to be fixed when PowerPC vector support is added.
 
-use llvm::{Integer, Pointer, Float, Double, Struct, Vector, Array};
-use abi::{self, FnType, ArgType};
+use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_size(ty: Type) -> usize {
-    if ty.kind() == Vector {
-        bug!("ty_size: unhandled type")
-    } else {
-        abi::ty_size(ty, 8)
-    }
-}
-
-fn is_homogenous_aggregate_ty(ty: Type) -> Option<(Type, u64)> {
-    fn check_array(ty: Type) -> Option<(Type, u64)> {
-        let len = ty.array_length() as u64;
-        if len == 0 {
-            return None
-        }
-        let elt = ty.element_type();
-
-        // if our element is an HFA/HVA, so are we; multiply members by our len
-        is_homogenous_aggregate_ty(elt).map(|(base_ty, members)| (base_ty, len * members))
-    }
 
-    fn check_struct(ty: Type) -> Option<(Type, u64)> {
-        let str_tys = ty.field_types();
-        if str_tys.len() == 0 {
-            return None
-        }
+fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>)
+                                     -> Option<Uniform> {
+    arg.layout.homogenous_aggregate(ccx).and_then(|unit| {
+        let size = arg.layout.size(ccx);
 
-        let mut prev_base_ty = None;
-        let mut members = 0;
-        for opt_homog_agg in str_tys.iter().map(|t| is_homogenous_aggregate_ty(*t)) {
-            match (prev_base_ty, opt_homog_agg) {
-                // field isn't itself an HFA, so we aren't either
-                (_, None) => return None,
-
-                // first field - store its type and number of members
-                (None, Some((field_ty, field_members))) => {
-                    prev_base_ty = Some(field_ty);
-                    members = field_members;
-                },
-
-                // 2nd or later field - give up if it's a different type; otherwise incr. members
-                (Some(prev_ty), Some((field_ty, field_members))) => {
-                    if prev_ty != field_ty {
-                        return None;
-                    }
-                    members += field_members;
-                }
-            }
+        // Ensure we have at most eight uniquely addressable members.
+        if size > unit.size.checked_mul(8, ccx).unwrap() {
+            return None;
         }
 
-        // Because of previous checks, we know prev_base_ty is Some(...) because
-        //   1. str_tys has at least one element; and
-        //   2. prev_base_ty was filled in (or we would've returned early)
-        let (base_ty, members) = (prev_base_ty.unwrap(), members);
-
-        // Ensure there is no padding.
-        if ty_size(ty) == ty_size(base_ty) * (members as usize) {
-            Some((base_ty, members))
-        } else {
-            None
-        }
-    }
+        let valid_unit = match unit.kind {
+            RegKind::Integer => false,
+            RegKind::Float => true,
+            RegKind::Vector => size.bits() == 128
+        };
 
-    let homog_agg = match ty.kind() {
-        Float  => Some((ty, 1)),
-        Double => Some((ty, 1)),
-        Array  => check_array(ty),
-        Struct => check_struct(ty),
-        _ => None
-    };
-
-    // Ensure we have at most eight uniquely addressable members
-    homog_agg.and_then(|(base_ty, members)| {
-        if members > 0 && members <= 8 {
-            Some((base_ty, members))
+        if valid_unit {
+            Some(Uniform {
+                unit,
+                total: size
+            })
         } else {
             None
         }
     })
 }
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(64);
         return;
     }
@@ -111,78 +53,52 @@ fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
         ret.make_indirect(ccx);
     }
 
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(ret.ty) {
-        ret.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, ret) {
+        ret.cast_to(ccx, uniform);
         return;
     }
-    let size = ty_size(ret.ty);
-    if size <= 16 {
-        let llty = if size <= 1 {
-            Type::i8(ccx)
-        } else if size <= 2 {
-            Type::i16(ccx)
-        } else if size <= 4 {
-            Type::i32(ccx)
-        } else if size <= 8 {
-            Type::i64(ccx)
+    let size = ret.layout.size(ccx);
+    let bits = size.bits();
+    if bits <= 128 {
+        let unit = if bits <= 8 {
+            Reg::i8()
+        } else if bits <= 16 {
+            Reg::i16()
+        } else if bits <= 32 {
+            Reg::i32()
         } else {
-            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+            Reg::i64()
         };
-        ret.cast = Some(llty);
+
+        ret.cast_to(ccx, Uniform {
+            unit,
+            total: size
+        });
         return;
     }
 
     ret.make_indirect(ccx);
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if is_reg_ty(arg.ty) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if !arg.layout.is_aggregate() {
         arg.extend_integer_width_to(64);
         return;
     }
 
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(arg.ty) {
-        arg.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, arg) {
+        arg.cast_to(ccx, uniform);
         return;
     }
 
-    arg.cast = Some(struct_ty(ccx, arg.ty));
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double => true,
-        _ => false
-    }
-}
-
-fn coerce_to_long(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let long_ty = Type::i64(ccx);
-    let mut args = Vec::new();
-
-    let mut n = size / 64;
-    while n > 0 {
-        args.push(long_ty);
-        n -= 1;
-    }
-
-    let r = size % 64;
-    if r > 0 {
-        args.push(Type::ix(ccx, r as u64));
-    }
-
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_long(ccx, size), false)
+    let total = arg.layout.size(ccx);
+    arg.cast_to(ccx, Uniform {
+        unit: Reg::i64(),
+        total
+    });
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_s390x.rs b/src/librustc_trans/cabi_s390x.rs
index 5a666c6083d..fedebea3f4c 100644
--- a/src/librustc_trans/cabi_s390x.rs
+++ b/src/librustc_trans/cabi_s390x.rs
@@ -11,130 +11,60 @@
 // FIXME: The assumes we're using the non-vector ABI, i.e. compiling
 // for a pre-z13 machine or using -mno-vx.
 
-use llvm::{Integer, Pointer, Float, Double, Struct, Array, Vector};
-use abi::{align_up_to, FnType, ArgType};
+use abi::{FnType, ArgType, LayoutExt, Reg};
 use context::CrateContext;
-use type_::Type;
 
-use std::cmp;
+use rustc::ty::layout::{self, Layout, TyLayout};
 
-fn align(off: usize, ty: Type) -> usize {
-    let a = ty_align(ty);
-    return align_up_to(off, a);
-}
-
-fn ty_align(ty: Type) -> usize {
-    match ty.kind() {
-        Integer => ((ty.int_width() as usize) + 7) / 8,
-        Pointer => 8,
-        Float => 4,
-        Double => 8,
-        Struct => {
-            if ty.is_packed() {
-                1
-            } else {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(1, |a, t| cmp::max(a, ty_align(*t)))
-            }
-        }
-        Array => {
-            let elt = ty.element_type();
-            ty_align(elt)
-        }
-        Vector => ty_size(ty),
-        _ => bug!("ty_align: unhandled type")
-    }
-}
-
-fn ty_size(ty: Type) -> usize {
-    match ty.kind() {
-        Integer => ((ty.int_width() as usize) + 7) / 8,
-        Pointer => 8,
-        Float => 4,
-        Double => 8,
-        Struct => {
-            if ty.is_packed() {
-                let str_tys = ty.field_types();
-                str_tys.iter().fold(0, |s, t| s + ty_size(*t))
-            } else {
-                let str_tys = ty.field_types();
-                let size = str_tys.iter().fold(0, |s, t| align(s, *t) + ty_size(*t));
-                align(size, ty)
-            }
-        }
-        Array => {
-            let len = ty.array_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt);
-            len * eltsz
-        }
-        Vector => {
-            let len = ty.vector_length();
-            let elt = ty.element_type();
-            let eltsz = ty_size(elt);
-            len * eltsz
-        }
-        _ => bug!("ty_size: unhandled type")
-    }
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() && ret.layout.size(ccx).bits() <= 64 {
         ret.extend_integer_width_to(64);
     } else {
         ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if arg.ty.kind() == Struct {
-        fn is_single_fp_element(tys: &[Type]) -> bool {
-            if tys.len() != 1 {
-                return false;
-            }
-            match tys[0].kind() {
-                Float | Double => true,
-                Struct => is_single_fp_element(&tys[0].field_types()),
-                _ => false
-            }
-        }
-
-        if is_single_fp_element(&arg.ty.field_types()) {
-            match ty_size(arg.ty) {
-                4 => arg.cast = Some(Type::f32(ccx)),
-                8 => arg.cast = Some(Type::f64(ccx)),
-                _ => arg.make_indirect(ccx)
-            }
-        } else {
-            match ty_size(arg.ty) {
-                1 => arg.cast = Some(Type::i8(ccx)),
-                2 => arg.cast = Some(Type::i16(ccx)),
-                4 => arg.cast = Some(Type::i32(ccx)),
-                8 => arg.cast = Some(Type::i64(ccx)),
-                _ => arg.make_indirect(ccx)
+fn is_single_fp_element<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+                                  layout: TyLayout<'tcx>) -> bool {
+    match *layout {
+        Layout::Scalar { value: layout::F32, .. } |
+        Layout::Scalar { value: layout::F64, .. } => true,
+        Layout::Univariant { .. } => {
+            if layout.field_count() == 1 {
+                is_single_fp_element(ccx, layout.field(ccx, 0))
+            } else {
+                false
             }
         }
-        return;
+        _ => false
     }
+}
 
-    if is_reg_ty(arg.ty) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    let size = arg.layout.size(ccx);
+    if !arg.layout.is_aggregate() && size.bits() <= 64 {
         arg.extend_integer_width_to(64);
-    } else {
-        arg.make_indirect(ccx);
+        return;
     }
-}
 
-fn is_reg_ty(ty: Type) -> bool {
-    match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double => ty_size(ty) <= 8,
-        _ => false
+    if is_single_fp_element(ccx, arg.layout) {
+        match size.bytes() {
+            4 => arg.cast_to(ccx, Reg::f32()),
+            8 => arg.cast_to(ccx, Reg::f64()),
+            _ => arg.make_indirect(ccx)
+        }
+    } else {
+        match size.bytes() {
+            1 => arg.cast_to(ccx, Reg::i8()),
+            2 => arg.cast_to(ccx, Reg::i16()),
+            4 => arg.cast_to(ccx, Reg::i32()),
+            8 => arg.cast_to(ccx, Reg::i64()),
+            _ => arg.make_indirect(ccx)
+        }
     }
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_sparc.rs b/src/librustc_trans/cabi_sparc.rs
index 25fe53e7ef4..c17901e1ade 100644
--- a/src/librustc_trans/cabi_sparc.rs
+++ b/src/librustc_trans/cabi_sparc.rs
@@ -8,94 +8,40 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![allow(non_upper_case_globals)]
-
-use libc::c_uint;
 use std::cmp;
-use llvm;
-use llvm::{Integer, Pointer, Float, Double, Vector};
-use abi::{self, align_up_to, ArgType, FnType};
+use abi::{align_up_to, ArgType, FnType, LayoutExt, Reg, Uniform};
 use context::CrateContext;
-use type_::Type;
-
-fn ty_align(ty: Type) -> usize {
-    abi::ty_align(ty, 4)
-}
 
-fn ty_size(ty: Type) -> usize {
-    abi::ty_size(ty, 4)
-}
-
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
     } else {
         ret.make_indirect(ccx);
     }
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut usize) {
-    let orig_offset = *offset;
-    let size = ty_size(arg.ty) * 8;
-    let mut align = ty_align(arg.ty);
-
+fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType, offset: &mut u64) {
+    let size = arg.layout.size(ccx);
+    let mut align = arg.layout.align(ccx).abi();
     align = cmp::min(cmp::max(align, 4), 8);
-    *offset = align_up_to(*offset, align);
-    *offset += align_up_to(size, align * 8) / 8;
-
-    if !is_reg_ty(arg.ty) {
-        arg.cast = Some(struct_ty(ccx, arg.ty));
-        arg.pad = padding_ty(ccx, align, orig_offset);
-    } else {
-        arg.extend_integer_width_to(32);
-    }
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    return match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double
-        | Vector => true,
-        _ => false
-    };
-}
-
-fn padding_ty(ccx: &CrateContext, align: usize, offset: usize) -> Option<Type> {
-    if ((align - 1 ) & offset) > 0 {
-        Some(Type::i32(ccx))
-    } else {
-        None
-    }
-}
-
-fn coerce_to_int(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let int_ty = Type::i32(ccx);
-    let mut args = Vec::new();
 
-    let mut n = size / 32;
-    while n > 0 {
-        args.push(int_ty);
-        n -= 1;
-    }
-
-    let r = size % 32;
-    if r > 0 {
-        unsafe {
-            args.push(Type::from_ref(llvm::LLVMIntTypeInContext(ccx.llcx(), r as c_uint)));
+    if arg.layout.is_aggregate() {
+        arg.cast_to(ccx, Uniform {
+            unit: Reg::i32(),
+            total: size
+        });
+        if ((align - 1) & *offset) > 0 {
+            arg.pad_with(ccx, Reg::i32());
         }
+    } else {
+        arg.extend_integer_width_to(32)
     }
 
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_int(ccx, size), false)
+    *offset = align_up_to(*offset, align);
+    *offset += align_up_to(size.bytes(), align);
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_sparc64.rs b/src/librustc_trans/cabi_sparc64.rs
index e675cca33d1..b75fa97f948 100644
--- a/src/librustc_trans/cabi_sparc64.rs
+++ b/src/librustc_trans/cabi_sparc64.rs
@@ -10,170 +10,89 @@
 
 // FIXME: This needs an audit for correctness and completeness.
 
-use llvm::{Integer, Pointer, Float, Double, Struct, Vector, Array};
-use abi::{self, FnType, ArgType};
+use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
 use context::CrateContext;
-use type_::Type;
 
-fn ty_size(ty: Type) -> usize {
-    if ty.kind() == Vector {
-        bug!("ty_size: unhandled type")
-    } else {
-        abi::ty_size(ty, 8)
-    }
-}
-
-fn is_homogenous_aggregate_ty(ty: Type) -> Option<(Type, u64)> {
-    fn check_array(ty: Type) -> Option<(Type, u64)> {
-        let len = ty.array_length() as u64;
-        if len == 0 {
-            return None
-        }
-        let elt = ty.element_type();
-
-        // if our element is an HFA/HVA, so are we; multiply members by our len
-        is_homogenous_aggregate_ty(elt).map(|(base_ty, members)| (base_ty, len * members))
-    }
-
-    fn check_struct(ty: Type) -> Option<(Type, u64)> {
-        let str_tys = ty.field_types();
-        if str_tys.len() == 0 {
-            return None
-        }
-
-        let mut prev_base_ty = None;
-        let mut members = 0;
-        for opt_homog_agg in str_tys.iter().map(|t| is_homogenous_aggregate_ty(*t)) {
-            match (prev_base_ty, opt_homog_agg) {
-                // field isn't itself an HFA, so we aren't either
-                (_, None) => return None,
+fn is_homogenous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>)
+                                     -> Option<Uniform> {
+    arg.layout.homogenous_aggregate(ccx).and_then(|unit| {
+        let size = arg.layout.size(ccx);
 
-                // first field - store its type and number of members
-                (None, Some((field_ty, field_members))) => {
-                    prev_base_ty = Some(field_ty);
-                    members = field_members;
-                },
-
-                // 2nd or later field - give up if it's a different type; otherwise incr. members
-                (Some(prev_ty), Some((field_ty, field_members))) => {
-                    if prev_ty != field_ty {
-                        return None;
-                    }
-                    members += field_members;
-                }
-            }
+        // Ensure we have at most eight uniquely addressable members.
+        if size > unit.size.checked_mul(8, ccx).unwrap() {
+            return None;
         }
 
-        // Because of previous checks, we know prev_base_ty is Some(...) because
-        //   1. str_tys has at least one element; and
-        //   2. prev_base_ty was filled in (or we would've returned early)
-        let (base_ty, members) = (prev_base_ty.unwrap(), members);
-
-        // Ensure there is no padding.
-        if ty_size(ty) == ty_size(base_ty) * (members as usize) {
-            Some((base_ty, members))
-        } else {
-            None
-        }
-    }
-
-    let homog_agg = match ty.kind() {
-        Float  => Some((ty, 1)),
-        Double => Some((ty, 1)),
-        Array  => check_array(ty),
-        Struct => check_struct(ty),
-        _ => None
-    };
+        let valid_unit = match unit.kind {
+            RegKind::Integer => false,
+            RegKind::Float => true,
+            RegKind::Vector => size.bits() == 128
+        };
 
-    // Ensure we have at most eight uniquely addressable members
-    homog_agg.and_then(|(base_ty, members)| {
-        if members > 0 && members <= 8 {
-            Some((base_ty, members))
+        if valid_unit {
+            Some(Uniform {
+                unit,
+                total: size
+            })
         } else {
             None
         }
     })
 }
 
-fn classify_ret_ty(ccx: &CrateContext, ret: &mut ArgType) {
-    if is_reg_ty(ret.ty) {
+fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>) {
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(64);
         return;
     }
 
-    // don't return aggregates in registers
-    ret.make_indirect(ccx);
-
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(ret.ty) {
-        ret.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, ret) {
+        ret.cast_to(ccx, uniform);
         return;
     }
-    let size = ty_size(ret.ty);
-    if size <= 16 {
-        let llty = if size <= 1 {
-            Type::i8(ccx)
-        } else if size <= 2 {
-            Type::i16(ccx)
-        } else if size <= 4 {
-            Type::i32(ccx)
-        } else if size <= 8 {
-            Type::i64(ccx)
+    let size = ret.layout.size(ccx);
+    let bits = size.bits();
+    if bits <= 128 {
+        let unit = if bits <= 8 {
+            Reg::i8()
+        } else if bits <= 16 {
+            Reg::i16()
+        } else if bits <= 32 {
+            Reg::i32()
         } else {
-            Type::array(&Type::i64(ccx), ((size + 7 ) / 8 ) as u64)
+            Reg::i64()
         };
-        ret.cast = Some(llty);
+
+        ret.cast_to(ccx, Uniform {
+            unit,
+            total: size
+        });
         return;
     }
+
+    // don't return aggregates in registers
+    ret.make_indirect(ccx);
 }
 
-fn classify_arg_ty(ccx: &CrateContext, arg: &mut ArgType) {
-    if is_reg_ty(arg.ty) {
+fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>) {
+    if !arg.layout.is_aggregate() {
         arg.extend_integer_width_to(64);
         return;
     }
 
-    if let Some((base_ty, members)) = is_homogenous_aggregate_ty(arg.ty) {
-        arg.cast = Some(Type::array(&base_ty, members));
+    if let Some(uniform) = is_homogenous_aggregate(ccx, arg) {
+        arg.cast_to(ccx, uniform);
         return;
     }
 
-    arg.cast = Some(struct_ty(ccx, arg.ty));
-}
-
-fn is_reg_ty(ty: Type) -> bool {
-    match ty.kind() {
-        Integer
-        | Pointer
-        | Float
-        | Double => true,
-        _ => false
-    }
-}
-
-fn coerce_to_long(ccx: &CrateContext, size: usize) -> Vec<Type> {
-    let long_ty = Type::i64(ccx);
-    let mut args = Vec::new();
-
-    let mut n = size / 64;
-    while n > 0 {
-        args.push(long_ty);
-        n -= 1;
-    }
-
-    let r = size % 64;
-    if r > 0 {
-        args.push(Type::ix(ccx, r as u64));
-    }
-
-    args
-}
-
-fn struct_ty(ccx: &CrateContext, ty: Type) -> Type {
-    let size = ty_size(ty) * 8;
-    Type::struct_(ccx, &coerce_to_long(ccx, size), false)
+    let total = arg.layout.size(ccx);
+    arg.cast_to(ccx, Uniform {
+        unit: Reg::i64(),
+        total
+    });
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
     if !fty.ret.is_ignore() {
         classify_ret_ty(ccx, &mut fty.ret);
     }
diff --git a/src/librustc_trans/cabi_x86.rs b/src/librustc_trans/cabi_x86.rs
index fea005f3d77..9f5520dabe3 100644
--- a/src/librustc_trans/cabi_x86.rs
+++ b/src/librustc_trans/cabi_x86.rs
@@ -8,11 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use llvm::*;
-use abi::{ArgAttribute, FnType};
-use type_::Type;
-use super::common::*;
-use super::machine::*;
+use abi::{ArgAttribute, FnType, LayoutExt, Reg, RegKind};
+use common::CrateContext;
 
 #[derive(PartialEq)]
 pub enum Flavor {
@@ -20,9 +17,11 @@ pub enum Flavor {
     Fastcall
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+                                  fty: &mut FnType<'tcx>,
+                                  flavor: Flavor) {
     if !fty.ret.is_ignore() {
-        if fty.ret.ty.kind() == Struct {
+        if fty.ret.layout.is_aggregate() {
             // Returning a structure. Most often, this will use
             // a hidden first argument. On some platforms, though,
             // small structs are returned as integers.
@@ -33,11 +32,12 @@ pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
             let t = &ccx.sess().target.target;
             if t.options.is_like_osx || t.options.is_like_windows
                 || t.options.is_like_openbsd {
-                match llsize_of_alloc(ccx, fty.ret.ty) {
-                    1 => fty.ret.cast = Some(Type::i8(ccx)),
-                    2 => fty.ret.cast = Some(Type::i16(ccx)),
-                    4 => fty.ret.cast = Some(Type::i32(ccx)),
-                    8 => fty.ret.cast = Some(Type::i64(ccx)),
+                let size = fty.ret.layout.size(ccx);
+                match size.bytes() {
+                    1 => fty.ret.cast_to(ccx, Reg::i8()),
+                    2 => fty.ret.cast_to(ccx, Reg::i16()),
+                    4 => fty.ret.cast_to(ccx, Reg::i32()),
+                    8 => fty.ret.cast_to(ccx, Reg::i64()),
                     _ => fty.ret.make_indirect(ccx)
                 }
             } else {
@@ -50,7 +50,7 @@ pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
 
     for arg in &mut fty.args {
         if arg.is_ignore() { continue; }
-        if arg.ty.kind() == Struct {
+        if arg.layout.is_aggregate() {
             arg.make_indirect(ccx);
             arg.attrs.set(ArgAttribute::ByVal);
         } else {
@@ -73,12 +73,15 @@ pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
         for arg in &mut fty.args {
             if arg.is_ignore() || arg.is_indirect() { continue; }
 
-            if arg.ty.kind() == Float {
+            // At this point we know this must be a primitive of sorts.
+            let unit = arg.layout.homogenous_aggregate(ccx).unwrap();
+            let size = arg.layout.size(ccx);
+            assert_eq!(unit.size, size);
+            if unit.kind == RegKind::Float {
                 continue;
             }
 
-            let size = llbitsize_of_real(ccx, arg.ty);
-            let size_in_regs = (size + 31) / 32;
+            let size_in_regs = (size.bits() + 31) / 32;
 
             if size_in_regs == 0 {
                 continue;
@@ -90,7 +93,7 @@ pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType, flavor: Flavor) {
 
             free_regs -= size_in_regs;
 
-            if size <= 32 && (arg.ty.kind() == Pointer || arg.ty.kind() == Integer) {
+            if size.bits() <= 32 && unit.kind == RegKind::Integer {
                 arg.attrs.set(ArgAttribute::InReg);
             }
 
diff --git a/src/librustc_trans/cabi_x86_64.rs b/src/librustc_trans/cabi_x86_64.rs
index 7f2fdbf000b..cbe170d8583 100644
--- a/src/librustc_trans/cabi_x86_64.rs
+++ b/src/librustc_trans/cabi_x86_64.rs
@@ -11,388 +11,250 @@
 // The classification code for the x86_64 ABI is taken from the clay language
 // https://github.com/jckarter/clay/blob/master/compiler/src/externals.cpp
 
-#![allow(non_upper_case_globals)]
-use self::RegClass::*;
-
-use llvm::{Integer, Pointer, Float, Double};
-use llvm::{Struct, Array, Vector};
-use abi::{self, ArgType, ArgAttribute, FnType};
+use abi::{ArgType, ArgAttribute, CastTarget, FnType, LayoutExt, Reg, RegKind};
 use context::CrateContext;
-use type_::Type;
-
-#[derive(Clone, Copy, PartialEq)]
-enum RegClass {
-    NoClass,
-    Int,
-    SSEFs,
-    SSEFv,
-    SSEDs,
-    SSEDv,
-    SSEInt(/* bitwidth */ u64),
-    /// Data that can appear in the upper half of an SSE register.
-    SSEUp,
-    X87,
-    X87Up,
-    ComplexX87,
-    Memory
-}
-
-trait TypeMethods {
-    fn is_reg_ty(&self) -> bool;
-}
-
-impl TypeMethods for Type {
-    fn is_reg_ty(&self) -> bool {
-        match self.kind() {
-            Integer | Pointer | Float | Double => true,
-            _ => false
-        }
-    }
-}
-
-impl RegClass {
-    fn is_sse(&self) -> bool {
-        match *self {
-            SSEFs | SSEFv | SSEDs | SSEDv | SSEInt(_) => true,
-            _ => false
-        }
-    }
-}
-
-trait ClassList {
-    fn is_pass_byval(&self) -> bool;
-    fn is_ret_bysret(&self) -> bool;
-}
-
-impl ClassList for [RegClass] {
-    fn is_pass_byval(&self) -> bool {
-        if self.is_empty() { return false; }
-
-        let class = self[0];
-           class == Memory
-        || class == X87
-        || class == ComplexX87
-    }
 
-    fn is_ret_bysret(&self) -> bool {
-        if self.is_empty() { return false; }
+use rustc::ty::layout::{self, Layout, TyLayout, Size};
 
-        self[0] == Memory
-    }
+#[derive(Clone, Copy, PartialEq, Debug)]
+enum Class {
+    None,
+    Int,
+    Sse,
+    SseUp
 }
 
-fn classify_ty(ty: Type) -> Vec<RegClass> {
-    fn align(off: usize, ty: Type) -> usize {
-        let a = ty_align(ty);
-        return (off + a - 1) / a * a;
-    }
-
-    fn ty_align(ty: Type) -> usize {
-        abi::ty_align(ty, 8)
-    }
-
-    fn ty_size(ty: Type) -> usize {
-        abi::ty_size(ty, 8)
-    }
-
-    fn all_mem(cls: &mut [RegClass]) {
-        for elt in cls {
-            *elt = Memory;
-        }
-    }
-
-    fn unify(cls: &mut [RegClass],
-             i: usize,
-             newv: RegClass) {
-        if cls[i] == newv { return }
+#[derive(Clone, Copy, Debug)]
+struct Memory;
 
-        let to_write = match (cls[i], newv) {
-            (NoClass,     _) => newv,
-            (_,           NoClass) => return,
+// Currently supported vector size (AVX).
+const LARGEST_VECTOR_SIZE: usize = 256;
+const MAX_EIGHTBYTES: usize = LARGEST_VECTOR_SIZE / 64;
 
-            (Memory,      _) |
-            (_,           Memory) => Memory,
+fn classify_arg<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &ArgType<'tcx>)
+                          -> Result<[Class; MAX_EIGHTBYTES], Memory> {
+    fn unify(cls: &mut [Class],
+             off: u64,
+             c: Class) {
+        let i = (off / 8) as usize;
+        let to_write = match (cls[i], c) {
+            (Class::None, _) => c,
+            (_, Class::None) => return,
 
-            (Int,         _) |
-            (_,           Int) => Int,
+            (Class::Int, _) |
+            (_, Class::Int) => Class::Int,
 
-            (X87,         _) |
-            (X87Up,       _) |
-            (ComplexX87,  _) |
-            (_,           X87) |
-            (_,           X87Up) |
-            (_,           ComplexX87) => Memory,
+            (Class::Sse, _) |
+            (_, Class::Sse) => Class::Sse,
 
-            (SSEFv,       SSEUp) |
-            (SSEFs,       SSEUp) |
-            (SSEDv,       SSEUp) |
-            (SSEDs,       SSEUp) |
-            (SSEInt(_),   SSEUp) => return,
-
-            (..) => newv
+            (Class::SseUp, Class::SseUp) => Class::SseUp
         };
         cls[i] = to_write;
     }
 
-    fn classify_struct(tys: &[Type],
-                       cls: &mut [RegClass],
-                       i: usize,
-                       off: usize,
-                       packed: bool) {
-        let mut field_off = off;
-        for ty in tys {
-            if !packed {
-                field_off = align(field_off, *ty);
+    fn classify<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
+                          layout: TyLayout<'tcx>,
+                          cls: &mut [Class],
+                          off: u64)
+                          -> Result<(), Memory> {
+        if off % layout.align(ccx).abi() != 0 {
+            if layout.size(ccx).bytes() > 0 {
+                return Err(Memory);
             }
-            classify(*ty, cls, i, field_off);
-            field_off += ty_size(*ty);
+            return Ok(());
         }
-    }
 
-    fn classify(ty: Type,
-                cls: &mut [RegClass], ix: usize,
-                off: usize) {
-        let t_align = ty_align(ty);
-        let t_size = ty_size(ty);
-
-        let misalign = off % t_align;
-        if misalign != 0 {
-            let mut i = off / 8;
-            let e = (off + t_size + 7) / 8;
-            while i < e {
-                unify(cls, ix + i, Memory);
-                i += 1;
+        match *layout {
+            Layout::Scalar { value, .. } |
+            Layout::RawNullablePointer { value, .. } => {
+                let reg = match value {
+                    layout::Int(_) |
+                    layout::Pointer => Class::Int,
+                    layout::F32 |
+                    layout::F64 => Class::Sse
+                };
+                unify(cls, off, reg);
             }
-            return;
-        }
 
-        match ty.kind() {
-            Integer |
-            Pointer => {
-                unify(cls, ix + off / 8, Int);
+            Layout::CEnum { .. } => {
+                unify(cls, off, Class::Int);
             }
-            Float => {
-                if off % 8 == 4 {
-                    unify(cls, ix + off / 8, SSEFv);
-                } else {
-                    unify(cls, ix + off / 8, SSEFs);
+
+            Layout::Vector { element, count } => {
+                unify(cls, off, Class::Sse);
+
+                // everything after the first one is the upper
+                // half of a register.
+                let eltsz = element.size(ccx).bytes();
+                for i in 1..count {
+                    unify(cls, off + i * eltsz, Class::SseUp);
                 }
             }
-            Double => {
-                unify(cls, ix + off / 8, SSEDs);
-            }
-            Struct => {
-                classify_struct(&ty.field_types(), cls, ix, off, ty.is_packed());
-            }
-            Array => {
-                let len = ty.array_length();
-                let elt = ty.element_type();
-                let eltsz = ty_size(elt);
-                let mut i = 0;
-                while i < len {
-                    classify(elt, cls, ix, off + i * eltsz);
-                    i += 1;
+
+            Layout::Array { count, .. } => {
+                if count > 0 {
+                    let elt = layout.field(ccx, 0);
+                    let eltsz = elt.size(ccx).bytes();
+                    for i in 0..count {
+                        classify(ccx, elt, cls, off + i * eltsz)?;
+                    }
                 }
             }
-            Vector => {
-                let len = ty.vector_length();
-                let elt = ty.element_type();
-                let eltsz = ty_size(elt);
-                let mut reg = match elt.kind() {
-                    Integer => SSEInt(elt.int_width()),
-                    Float => SSEFv,
-                    Double => SSEDv,
-                    _ => bug!("classify: unhandled vector element type")
-                };
 
-                let mut i = 0;
-                while i < len {
-                    unify(cls, ix + (off + i * eltsz) / 8, reg);
+            Layout::Univariant { ref variant, .. } => {
+                for i in 0..layout.field_count() {
+                    let field_off = off + variant.offsets[i].bytes();
+                    classify(ccx, layout.field(ccx, i), cls, field_off)?;
+                }
+            }
 
-                    // everything after the first one is the upper
-                    // half of a register.
-                    reg = SSEUp;
-                    i += 1;
+            Layout::UntaggedUnion { .. } => {
+                for i in 0..layout.field_count() {
+                    classify(ccx, layout.field(ccx, i), cls, off)?;
                 }
             }
-            _ => bug!("classify: unhandled type")
+
+            Layout::FatPointer { .. } |
+            Layout::General { .. } |
+            Layout::StructWrappedNullablePointer { .. } => return Err(Memory)
         }
+
+        Ok(())
+    }
+
+    let n = ((arg.layout.size(ccx).bytes() + 7) / 8) as usize;
+    if n > MAX_EIGHTBYTES {
+        return Err(Memory);
     }
 
-    fn fixup(ty: Type, cls: &mut [RegClass]) {
+    let mut cls = [Class::None; MAX_EIGHTBYTES];
+    classify(ccx, arg.layout, &mut cls, 0)?;
+    if n > 2 {
+        if cls[0] != Class::Sse {
+            return Err(Memory);
+        }
+        if cls[1..n].iter().any(|&c| c != Class::SseUp) {
+            return Err(Memory);
+        }
+    } else {
         let mut i = 0;
-        let ty_kind = ty.kind();
-        let e = cls.len();
-        if cls.len() > 2 && (ty_kind == Struct || ty_kind == Array || ty_kind == Vector) {
-            if cls[i].is_sse() {
+        while i < n {
+            if cls[i] == Class::SseUp {
+                cls[i] = Class::Sse;
+            } else if cls[i] == Class::Sse {
                 i += 1;
-                while i < e {
-                    if cls[i] != SSEUp {
-                        all_mem(cls);
-                        return;
-                    }
-                    i += 1;
-                }
+                while i != n && cls[i] == Class::SseUp { i += 1; }
             } else {
-                all_mem(cls);
-                return
-            }
-        } else {
-            while i < e {
-                if cls[i] == Memory {
-                    all_mem(cls);
-                    return;
-                }
-                if cls[i] == X87Up {
-                    // for darwin
-                    // cls[i] = SSEDs;
-                    all_mem(cls);
-                    return;
-                }
-                if cls[i] == SSEUp {
-                    cls[i] = SSEDv;
-                } else if cls[i].is_sse() {
-                    i += 1;
-                    while i != e && cls[i] == SSEUp { i += 1; }
-                } else if cls[i] == X87 {
-                    i += 1;
-                    while i != e && cls[i] == X87Up { i += 1; }
-                } else {
-                    i += 1;
-                }
+                i += 1;
             }
         }
     }
 
-    let words = (ty_size(ty) + 7) / 8;
-    let mut cls = vec![NoClass; words];
-    if words > 4 {
-        all_mem(&mut cls);
-        return cls;
-    }
-    classify(ty, &mut cls, 0, 0);
-    fixup(ty, &mut cls);
-    return cls;
+    Ok(cls)
 }
 
-fn llreg_ty(ccx: &CrateContext, cls: &[RegClass]) -> Type {
-    fn llvec_len(cls: &[RegClass]) -> usize {
-        let mut len = 1;
-        for c in cls {
-            if *c != SSEUp {
-                break;
-            }
-            len += 1;
-        }
-        return len;
+fn reg_component(cls: &[Class], i: &mut usize, size: u64) -> Option<Reg> {
+    if *i >= cls.len() {
+        return None;
     }
 
-    let mut tys = Vec::new();
-    let mut i = 0;
-    let e = cls.len();
-    while i < e {
-        match cls[i] {
-            Int => {
-                tys.push(Type::i64(ccx));
-            }
-            SSEFv | SSEDv | SSEInt(_) => {
-                let (elts_per_word, elt_ty) = match cls[i] {
-                    SSEFv => (2, Type::f32(ccx)),
-                    SSEDv => (1, Type::f64(ccx)),
-                    SSEInt(bits) => {
-                        assert!(bits == 8 || bits == 16 || bits == 32 || bits == 64,
-                                "llreg_ty: unsupported SSEInt width {}", bits);
-                        (64 / bits, Type::ix(ccx, bits))
+    match cls[*i] {
+        Class::None => None,
+        Class::Int => {
+            *i += 1;
+            Some(match size {
+                1 => Reg::i8(),
+                2 => Reg::i16(),
+                3 |
+                4 => Reg::i32(),
+                _ => Reg::i64()
+            })
+        }
+        Class::Sse => {
+            let vec_len = 1 + cls[*i+1..].iter().take_while(|&&c| c == Class::SseUp).count();
+            *i += vec_len;
+            Some(match size {
+                4 => Reg::f32(),
+                8 => Reg::f64(),
+                _ => {
+                    Reg {
+                        kind: RegKind::Vector,
+                        size: Size::from_bytes(vec_len as u64 * 8)
                     }
-                    _ => bug!(),
-                };
-                let vec_len = llvec_len(&cls[i + 1..]);
-                let vec_ty = Type::vector(&elt_ty, vec_len as u64 * elts_per_word);
-                tys.push(vec_ty);
-                i += vec_len;
-                continue;
-            }
-            SSEFs => {
-                tys.push(Type::f32(ccx));
-            }
-            SSEDs => {
-                tys.push(Type::f64(ccx));
-            }
-            _ => bug!("llregtype: unhandled class")
+                }
+            })
         }
-        i += 1;
+        c => bug!("reg_component: unhandled class {:?}", c)
     }
-    if tys.len() == 1 && tys[0].kind() == Vector {
-        // if the type contains only a vector, pass it as that vector.
-        tys[0]
+}
+
+fn cast_target(cls: &[Class], size: u64) -> CastTarget {
+    let mut i = 0;
+    let lo = reg_component(cls, &mut i, size).unwrap();
+    let offset = i as u64 * 8;
+    let target = if size <= offset {
+        CastTarget::from(lo)
     } else {
-        Type::struct_(ccx, &tys, false)
-    }
+        let hi = reg_component(cls, &mut i, size - offset).unwrap();
+        CastTarget::Pair(lo, hi)
+    };
+    assert_eq!(reg_component(cls, &mut i, 0), None);
+    target
 }
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
-    fn x86_64_ty<F>(ccx: &CrateContext,
-                    arg: &mut ArgType,
-                    is_mem_cls: F,
-                    ind_attr: Option<ArgAttribute>)
-        where F: FnOnce(&[RegClass]) -> bool
-    {
-        if !arg.ty.is_reg_ty() {
-            let cls = classify_ty(arg.ty);
-            if is_mem_cls(&cls) {
-                arg.make_indirect(ccx);
-                if let Some(attr) = ind_attr {
-                    arg.attrs.set(attr);
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
+    let mut int_regs = 6; // RDI, RSI, RDX, RCX, R8, R9
+    let mut sse_regs = 8; // XMM0-7
+
+    let mut x86_64_ty = |arg: &mut ArgType<'tcx>, is_arg: bool| {
+        let cls = classify_arg(ccx, arg);
+
+        let mut needed_int = 0;
+        let mut needed_sse = 0;
+        let in_mem = match cls {
+            Err(Memory) => true,
+            Ok(ref cls) if is_arg => {
+                for &c in cls {
+                    match c {
+                        Class::Int => needed_int += 1,
+                        Class::Sse => needed_sse += 1,
+                        _ => {}
+                    }
                 }
-            } else {
-                arg.cast = Some(llreg_ty(ccx, &cls));
+                arg.layout.is_aggregate() &&
+                    (int_regs < needed_int || sse_regs < needed_sse)
             }
-        } else {
-            arg.extend_integer_width_to(32);
-        }
-    }
+            Ok(_) => false
+        };
 
-    let mut int_regs = 6; // RDI, RSI, RDX, RCX, R8, R9
-    let mut sse_regs = 8; // XMM0-7
+        if in_mem {
+            // `sret` / `byval` parameter thus one less integer register available
+            int_regs -= 1;
 
-    if !fty.ret.is_ignore() {
-        x86_64_ty(ccx, &mut fty.ret, |cls| {
-            if cls.is_ret_bysret() {
-                // `sret` parameter thus one less register available
-                int_regs -= 1;
-                true
+            arg.make_indirect(ccx);
+            if is_arg {
+                arg.attrs.set(ArgAttribute::ByVal);
+            }
+        } else {
+            // split into sized chunks passed individually
+            int_regs -= needed_int;
+            sse_regs -= needed_sse;
+
+            if arg.layout.is_aggregate() {
+                let size = arg.layout.size(ccx).bytes();
+                arg.cast_to(ccx, cast_target(cls.as_ref().unwrap(), size))
             } else {
-                false
+                arg.extend_integer_width_to(32);
             }
-        }, None);
+        }
+    };
+
+    if !fty.ret.is_ignore() {
+        x86_64_ty(&mut fty.ret, false);
     }
 
     for arg in &mut fty.args {
         if arg.is_ignore() { continue; }
-        x86_64_ty(ccx, arg, |cls| {
-            let needed_int = cls.iter().filter(|&&c| c == Int).count() as isize;
-            let needed_sse = cls.iter().filter(|c| c.is_sse()).count() as isize;
-            let in_mem = cls.is_pass_byval() ||
-                         int_regs < needed_int ||
-                         sse_regs < needed_sse;
-            if in_mem {
-                // `byval` parameter thus one less integer register available
-                int_regs -= 1;
-            } else {
-                // split into sized chunks passed individually
-                int_regs -= needed_int;
-                sse_regs -= needed_sse;
-            }
-            in_mem
-        }, Some(ArgAttribute::ByVal));
-
-        // An integer, pointer, double or float parameter
-        // thus the above closure passed to `x86_64_ty` won't
-        // get called.
-        match arg.ty.kind() {
-            Integer | Pointer => int_regs -= 1,
-            Double | Float => sse_regs -= 1,
-            _ => {}
-        }
+        x86_64_ty(arg, true);
     }
 }
diff --git a/src/librustc_trans/cabi_x86_win64.rs b/src/librustc_trans/cabi_x86_win64.rs
index a849f382473..39e728d4e4f 100644
--- a/src/librustc_trans/cabi_x86_win64.rs
+++ b/src/librustc_trans/cabi_x86_win64.rs
@@ -8,30 +8,33 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use llvm::*;
-use super::common::*;
-use super::machine::*;
-use abi::{ArgType, FnType};
-use type_::Type;
+use abi::{ArgType, FnType, LayoutExt, Reg};
+use common::CrateContext;
+
+use rustc::ty::layout::Layout;
 
 // Win64 ABI: http://msdn.microsoft.com/en-us/library/zthk2dkh.aspx
 
-pub fn compute_abi_info(ccx: &CrateContext, fty: &mut FnType) {
-    let fixup = |a: &mut ArgType| {
-        match a.ty.kind() {
-            Struct => match llsize_of_alloc(ccx, a.ty) {
-                          1 => a.cast = Some(Type::i8(ccx)),
-                          2 => a.cast = Some(Type::i16(ccx)),
-                          4 => a.cast = Some(Type::i32(ccx)),
-                          8 => a.cast = Some(Type::i64(ccx)),
-                          _ => a.make_indirect(ccx)
-                      },
-            Integer => match llsize_of_alloc(ccx, a.ty) {
-                           1 ... 8 => a.extend_integer_width_to(32),
-                           16 => a.make_indirect(ccx),
-                           _ => bug!(),
-            },
-            _ => (),
+pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
+    let fixup = |a: &mut ArgType<'tcx>| {
+        let size = a.layout.size(ccx);
+        if a.layout.is_aggregate() {
+            match size.bits() {
+                8 => a.cast_to(ccx, Reg::i8()),
+                16 => a.cast_to(ccx, Reg::i16()),
+                32 => a.cast_to(ccx, Reg::i32()),
+                64 => a.cast_to(ccx, Reg::i64()),
+                _ => a.make_indirect(ccx)
+            };
+        } else {
+            if let Layout::Vector { .. } = *a.layout {
+                // FIXME(eddyb) there should be a size cap here
+                // (probably what clang calls "illegal vectors").
+            } else if size.bytes() > 8 {
+                a.make_indirect(ccx);
+            } else {
+                a.extend_integer_width_to(32);
+            }
         }
     };
 
diff --git a/src/librustc_trans/common.rs b/src/librustc_trans/common.rs
index a0906bb02f5..5d58c935389 100644
--- a/src/librustc_trans/common.rs
+++ b/src/librustc_trans/common.rs
@@ -27,7 +27,7 @@ use monomorphize;
 use type_::Type;
 use value::Value;
 use rustc::ty::{self, Ty, TyCtxt};
-use rustc::ty::layout::Layout;
+use rustc::ty::layout::{Layout, LayoutTyper};
 use rustc::ty::subst::{Subst, Substs};
 use rustc::hir;
 
@@ -63,7 +63,7 @@ pub fn type_is_immediate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -
         Layout::UntaggedUnion { .. } |
         Layout::RawNullablePointer { .. } |
         Layout::StructWrappedNullablePointer { .. } => {
-            !layout.is_unsized() && layout.size(&ccx.tcx().data_layout).bytes() == 0
+            !layout.is_unsized() && layout.size(ccx).bytes() == 0
         }
     }
 }
@@ -125,10 +125,8 @@ pub fn type_is_imm_pair<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>)
 
 /// Identify types which have size zero at runtime.
 pub fn type_is_zero_size<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> bool {
-    use machine::llsize_of_alloc;
-    use type_of::sizing_type_of;
-    let llty = sizing_type_of(ccx, ty);
-    llsize_of_alloc(ccx, llty) == 0
+    let layout = ccx.layout_of(ty);
+    !layout.is_unsized() && layout.size(ccx).bytes() == 0
 }
 
 /*
diff --git a/src/librustc_trans/consts.rs b/src/librustc_trans/consts.rs
index daf1a1ba95f..6b6fa538dc0 100644
--- a/src/librustc_trans/consts.rs
+++ b/src/librustc_trans/consts.rs
@@ -255,7 +255,7 @@ pub fn trans_static<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
             ccx.statics_to_rauw().borrow_mut().push((g, new_g));
             new_g
         };
-        llvm::LLVMSetAlignment(g, type_of::align_of(ccx, ty));
+        llvm::LLVMSetAlignment(g, ccx.align_of(ty));
         llvm::LLVMSetInitializer(g, v);
 
         // As an optimization, all shared statics which do not have interior
diff --git a/src/librustc_trans/context.rs b/src/librustc_trans/context.rs
index afb94f546ab..98fbb64fd55 100644
--- a/src/librustc_trans/context.rs
+++ b/src/librustc_trans/context.rs
@@ -28,6 +28,7 @@ use type_::Type;
 use rustc_data_structures::base_n;
 use rustc::ty::subst::Substs;
 use rustc::ty::{self, Ty, TyCtxt};
+use rustc::ty::layout::{LayoutTyper, TyLayout};
 use session::config::NoDebugInfo;
 use session::Session;
 use session::config;
@@ -828,18 +829,6 @@ impl<'b, 'tcx> CrateContext<'b, 'tcx> {
         TypeOfDepthLock(self.local())
     }
 
-    pub fn layout_of(&self, ty: Ty<'tcx>) -> &'tcx ty::layout::Layout {
-        self.tcx().infer_ctxt((), traits::Reveal::All).enter(|infcx| {
-            ty.layout(&infcx).unwrap_or_else(|e| {
-                match e {
-                    ty::layout::LayoutError::SizeOverflow(_) =>
-                        self.sess().fatal(&e.to_string()),
-                    _ => bug!("failed to get layout for `{}`: {}", ty, e)
-                }
-            })
-        })
-    }
-
     pub fn check_overflow(&self) -> bool {
         self.shared.check_overflow
     }
@@ -951,6 +940,54 @@ impl<'b, 'tcx> CrateContext<'b, 'tcx> {
     }
 }
 
+impl<'a, 'tcx> ty::layout::HasDataLayout for &'a SharedCrateContext<'a, 'tcx> {
+    fn data_layout(&self) -> &ty::layout::TargetDataLayout {
+        &self.tcx.data_layout
+    }
+}
+
+impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
+    fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
+        self.tcx
+    }
+}
+
+impl<'a, 'tcx> ty::layout::HasDataLayout for &'a CrateContext<'a, 'tcx> {
+    fn data_layout(&self) -> &ty::layout::TargetDataLayout {
+        &self.shared.tcx.data_layout
+    }
+}
+
+impl<'a, 'tcx> ty::layout::HasTyCtxt<'tcx> for &'a CrateContext<'a, 'tcx> {
+    fn tcx<'b>(&'b self) -> TyCtxt<'b, 'tcx, 'tcx> {
+        self.shared.tcx
+    }
+}
+
+impl<'a, 'tcx> LayoutTyper<'tcx> for &'a SharedCrateContext<'a, 'tcx> {
+    type TyLayout = TyLayout<'tcx>;
+
+    fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
+        self.tcx().infer_ctxt((), traits::Reveal::All).enter(|infcx| {
+            infcx.layout_of(ty).unwrap_or_else(|e| {
+                match e {
+                    ty::layout::LayoutError::SizeOverflow(_) =>
+                        self.sess().fatal(&e.to_string()),
+                    _ => bug!("failed to get layout for `{}`: {}", ty, e)
+                }
+            })
+        })
+    }
+}
+
+impl<'a, 'tcx> LayoutTyper<'tcx> for &'a CrateContext<'a, 'tcx> {
+    type TyLayout = TyLayout<'tcx>;
+
+    fn layout_of(self, ty: Ty<'tcx>) -> Self::TyLayout {
+        self.shared.layout_of(ty)
+    }
+}
+
 pub struct TypeOfDepthLock<'a, 'tcx: 'a>(&'a LocalCrateContext<'tcx>);
 
 impl<'a, 'tcx> Drop for TypeOfDepthLock<'a, 'tcx> {
diff --git a/src/librustc_trans/debuginfo/metadata.rs b/src/librustc_trans/debuginfo/metadata.rs
index 049178a2575..ccb693aa41f 100644
--- a/src/librustc_trans/debuginfo/metadata.rs
+++ b/src/librustc_trans/debuginfo/metadata.rs
@@ -35,7 +35,8 @@ use rustc_data_structures::ToHex;
 use {type_of, machine, monomorphize};
 use common::{self, CrateContext};
 use type_::Type;
-use rustc::ty::{self, AdtKind, Ty, layout};
+use rustc::ty::{self, AdtKind, Ty};
+use rustc::ty::layout::{self, LayoutTyper};
 use session::config;
 use util::nodemap::FxHashMap;
 use util::common::path2cstr;
@@ -900,7 +901,7 @@ impl<'tcx> StructMemberDescriptionFactory<'tcx> {
         let offsets = match *layout {
             layout::Univariant { ref variant, .. } => &variant.offsets,
             layout::Vector { element, count } => {
-                let element_size = element.size(&cx.tcx().data_layout).bytes();
+                let element_size = element.size(cx).bytes();
                 tmp = (0..count).
                   map(|i| layout::Size::from_bytes(i*element_size))
                   .collect::<Vec<layout::Size>>();
@@ -1564,7 +1565,7 @@ fn prepare_enum_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
         enum_llvm_type,
         EnumMDF(EnumMemberDescriptionFactory {
             enum_type: enum_type,
-            type_rep: type_rep,
+            type_rep: type_rep.layout,
             discriminant_type_metadata: discriminant_type_metadata,
             containing_scope: containing_scope,
             file_metadata: file_metadata,
@@ -1772,7 +1773,7 @@ pub fn create_global_var_metadata(cx: &CrateContext,
     let var_name = CString::new(var_name).unwrap();
     let linkage_name = CString::new(linkage_name).unwrap();
 
-    let global_align = type_of::align_of(cx, variable_type);
+    let global_align = cx.align_of(variable_type);
 
     unsafe {
         llvm::LLVMRustDIBuilderCreateStaticVariable(DIB(cx),
diff --git a/src/librustc_trans/debuginfo/mod.rs b/src/librustc_trans/debuginfo/mod.rs
index 8e86b50b3f7..1b7cf26853b 100644
--- a/src/librustc_trans/debuginfo/mod.rs
+++ b/src/librustc_trans/debuginfo/mod.rs
@@ -449,7 +449,7 @@ pub fn declare_local<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
         LocalVariable    |
         CapturedVariable => (0, DW_TAG_auto_variable)
     };
-    let align = ::type_of::align_of(cx, variable_type);
+    let align = cx.align_of(variable_type);
 
     let name = CString::new(variable_name.as_str().as_bytes()).unwrap();
     match (variable_access, &[][..]) {
diff --git a/src/librustc_trans/glue.rs b/src/librustc_trans/glue.rs
index 41a9ab2842d..59876a7f2a2 100644
--- a/src/librustc_trans/glue.rs
+++ b/src/librustc_trans/glue.rs
@@ -18,11 +18,10 @@ use llvm;
 use llvm::{ValueRef};
 use rustc::traits;
 use rustc::ty::{self, Ty, TypeFoldable};
+use rustc::ty::layout::LayoutTyper;
 use common::*;
-use machine::*;
 use meth;
 use monomorphize;
-use type_of::{sizing_type_of, align_of};
 use value::Value;
 use builder::Builder;
 
@@ -49,7 +48,7 @@ pub fn needs_drop_glue<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>, t: Ty<'tcx>
             if !scx.type_needs_drop(typ) && scx.type_is_sized(typ) {
                 scx.tcx().infer_ctxt((), traits::Reveal::All).enter(|infcx| {
                     let layout = t.layout(&infcx).unwrap();
-                    if layout.size(&scx.tcx().data_layout).bytes() == 0 {
+                    if layout.size(scx).bytes() == 0 {
                         // `Box<ZeroSizeType>` does not allocate.
                         false
                     } else {
@@ -69,9 +68,8 @@ pub fn size_and_align_of_dst<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, inf
     debug!("calculate size of DST: {}; with lost info: {:?}",
            t, Value(info));
     if bcx.ccx.shared().type_is_sized(t) {
-        let sizing_type = sizing_type_of(bcx.ccx, t);
-        let size = llsize_of_alloc(bcx.ccx, sizing_type);
-        let align = align_of(bcx.ccx, t);
+        let size = bcx.ccx.size_of(t);
+        let align = bcx.ccx.align_of(t);
         debug!("size_and_align_of_dst t={} info={:?} size: {} align: {}",
                t, Value(info), size, align);
         let size = C_uint(bcx.ccx, size);
@@ -82,9 +80,8 @@ pub fn size_and_align_of_dst<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, inf
         ty::TyAdt(def, substs) => {
             let ccx = bcx.ccx;
             // First get the size of all statically known fields.
-            // Don't use type_of::sizing_type_of because that expects t to be sized,
-            // and it also rounds up to alignment, which we want to avoid,
-            // as the unsized field's alignment could be smaller.
+            // Don't use size_of because it also rounds up to alignment, which we
+            // want to avoid, as the unsized field's alignment could be smaller.
             assert!(!t.is_simd());
             let layout = ccx.layout_of(t);
             debug!("DST {} layout: {:?}", t, layout);
@@ -154,14 +151,11 @@ pub fn size_and_align_of_dst<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, t: Ty<'tcx>, inf
             (meth::SIZE.get_usize(bcx, info), meth::ALIGN.get_usize(bcx, info))
         }
         ty::TySlice(_) | ty::TyStr => {
-            let unit_ty = t.sequence_element_type(bcx.tcx());
+            let unit = t.sequence_element_type(bcx.tcx());
             // The info in this case is the length of the str, so the size is that
             // times the unit size.
-            let llunit_ty = sizing_type_of(bcx.ccx, unit_ty);
-            let unit_align = llalign_of_min(bcx.ccx, llunit_ty);
-            let unit_size = llsize_of_alloc(bcx.ccx, llunit_ty);
-            (bcx.mul(info, C_uint(bcx.ccx, unit_size)),
-             C_uint(bcx.ccx, unit_align))
+            (bcx.mul(info, C_uint(bcx.ccx, bcx.ccx.size_of(unit))),
+             C_uint(bcx.ccx, bcx.ccx.align_of(unit)))
         }
         _ => bug!("Unexpected unsized type, found {}", t)
     }
diff --git a/src/librustc_trans/intrinsic.rs b/src/librustc_trans/intrinsic.rs
index 762bf8592ff..5e7d612d17f 100644
--- a/src/librustc_trans/intrinsic.rs
+++ b/src/librustc_trans/intrinsic.rs
@@ -151,7 +151,7 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
         }
         "min_align_of" => {
             let tp_ty = substs.type_at(0);
-            C_uint(ccx, type_of::align_of(ccx, tp_ty))
+            C_uint(ccx, ccx.align_of(tp_ty))
         }
         "min_align_of_val" => {
             let tp_ty = substs.type_at(0);
@@ -160,7 +160,7 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
                     glue::size_and_align_of_dst(bcx, tp_ty, llargs[1]);
                 llalign
             } else {
-                C_uint(ccx, type_of::align_of(ccx, tp_ty))
+                C_uint(ccx, ccx.align_of(tp_ty))
             }
         }
         "pref_align_of" => {
@@ -234,7 +234,7 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
             }
             let load = bcx.volatile_load(ptr);
             unsafe {
-                llvm::LLVMSetAlignment(load, type_of::align_of(ccx, tp_ty));
+                llvm::LLVMSetAlignment(load, ccx.align_of(tp_ty));
             }
             to_immediate(bcx, load, tp_ty)
         },
@@ -252,7 +252,7 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
                 let ptr = bcx.pointercast(llargs[0], val_ty(val).ptr_to());
                 let store = bcx.volatile_store(val, ptr);
                 unsafe {
-                    llvm::LLVMSetAlignment(store, type_of::align_of(ccx, tp_ty));
+                    llvm::LLVMSetAlignment(store, ccx.align_of(tp_ty));
                 }
             }
             C_nil(ccx)
@@ -634,7 +634,7 @@ pub fn trans_intrinsic_call<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
     if val_ty(llval) != Type::void(ccx) && machine::llsize_of_alloc(ccx, val_ty(llval)) != 0 {
         if let Some(ty) = fn_ty.ret.cast {
             let ptr = bcx.pointercast(llresult, ty.ptr_to());
-            bcx.store(llval, ptr, Some(type_of::align_of(ccx, ret_ty)));
+            bcx.store(llval, ptr, Some(ccx.align_of(ret_ty)));
         } else {
             store_ty(bcx, llval, llresult, Alignment::AbiAligned, ret_ty);
         }
@@ -651,7 +651,7 @@ fn copy_intrinsic<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
                             -> ValueRef {
     let ccx = bcx.ccx;
     let lltp_ty = type_of::type_of(ccx, tp_ty);
-    let align = C_i32(ccx, type_of::align_of(ccx, tp_ty) as i32);
+    let align = C_i32(ccx, ccx.align_of(tp_ty) as i32);
     let size = machine::llsize_of(ccx, lltp_ty);
     let int_size = machine::llbitsize_of_real(ccx, ccx.int_type());
 
@@ -685,7 +685,7 @@ fn memset_intrinsic<'a, 'tcx>(
     count: ValueRef
 ) -> ValueRef {
     let ccx = bcx.ccx;
-    let align = C_i32(ccx, type_of::align_of(ccx, ty) as i32);
+    let align = C_i32(ccx, ccx.align_of(ty) as i32);
     let lltp_ty = type_of::type_of(ccx, ty);
     let size = machine::llsize_of(ccx, lltp_ty);
     let dst = bcx.pointercast(dst, Type::i8p(ccx));
diff --git a/src/librustc_trans/meth.rs b/src/librustc_trans/meth.rs
index 75ab4076140..f5f92417858 100644
--- a/src/librustc_trans/meth.rs
+++ b/src/librustc_trans/meth.rs
@@ -17,7 +17,6 @@ use consts;
 use machine;
 use monomorphize;
 use type_::Type;
-use type_of::*;
 use value::Value;
 use rustc::ty;
 
@@ -80,14 +79,10 @@ pub fn get_vtable<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
     // Not in the cache. Build it.
     let nullptr = C_null(Type::nil(ccx).ptr_to());
 
-    let size_ty = sizing_type_of(ccx, ty);
-    let size = machine::llsize_of_alloc(ccx, size_ty);
-    let align = align_of(ccx, ty);
-
     let mut components: Vec<_> = [
         callee::get_fn(ccx, monomorphize::resolve_drop_in_place(ccx.shared(), ty)),
-        C_uint(ccx, size),
-        C_uint(ccx, align)
+        C_uint(ccx, ccx.size_of(ty)),
+        C_uint(ccx, ccx.align_of(ty))
     ].iter().cloned().collect();
 
     if let Some(trait_ref) = trait_ref {
diff --git a/src/librustc_trans/mir/block.rs b/src/librustc_trans/mir/block.rs
index d69f31a4504..caec4789edd 100644
--- a/src/librustc_trans/mir/block.rs
+++ b/src/librustc_trans/mir/block.rs
@@ -12,7 +12,8 @@ use llvm::{self, ValueRef, BasicBlockRef};
 use rustc_const_eval::{ErrKind, ConstEvalErr, note_const_eval_err};
 use rustc::middle::lang_items;
 use rustc::middle::const_val::ConstInt;
-use rustc::ty::{self, layout, TypeFoldable};
+use rustc::ty::{self, TypeFoldable};
+use rustc::ty::layout::{self, LayoutTyper};
 use rustc::mir;
 use abi::{Abi, FnType, ArgType};
 use base::{self, Lifetime};
@@ -24,8 +25,8 @@ use consts;
 use machine::llalign_of_min;
 use meth;
 use monomorphize;
+use type_of;
 use tvec;
-use type_of::{self, align_of};
 use type_::Type;
 
 use rustc_data_structures::indexed_vec::IndexVec;
@@ -177,7 +178,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                     };
                     let llslot = match op.val {
                         Immediate(_) | Pair(..) => {
-                            let llscratch = bcx.alloca(ret.original_ty, "ret");
+                            let llscratch = bcx.alloca(ret.memory_ty(bcx.ccx), "ret");
                             self.store_operand(&bcx, llscratch, None, op);
                             llscratch
                         }
@@ -189,7 +190,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                     };
                     let load = bcx.load(
                         bcx.pointercast(llslot, cast_ty.ptr_to()),
-                        Some(llalign_of_min(bcx.ccx, ret.ty)));
+                        Some(ret.layout.align(bcx.ccx).abi() as u32));
                     load
                 } else {
                     let op = self.trans_consume(&bcx, &mir::Lvalue::Local(mir::RETURN_POINTER));
@@ -515,7 +516,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                             (llargs[0], &llargs[1..])
                         }
                         ReturnDest::Nothing => {
-                            (C_undef(fn_ty.ret.original_ty.ptr_to()), &llargs[..])
+                            (C_undef(fn_ty.ret.memory_ty(bcx.ccx).ptr_to()), &llargs[..])
                         }
                         ReturnDest::IndirectOperand(dst, _) |
                         ReturnDest::Store(dst) => (dst, &llargs[..]),
@@ -534,7 +535,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                             val: Ref(dst, Alignment::AbiAligned),
                             ty: sig.output(),
                         };
-                        self.store_return(&bcx, ret_dest, fn_ty.ret, op);
+                        self.store_return(&bcx, ret_dest, &fn_ty.ret, op);
                     }
 
                     if let Some((_, target)) = *destination {
@@ -573,7 +574,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                             val: Immediate(invokeret),
                             ty: sig.output(),
                         };
-                        self.store_return(&ret_bcx, ret_dest, fn_ty.ret, op);
+                        self.store_return(&ret_bcx, ret_dest, &fn_ty.ret, op);
                     }
                 } else {
                     let llret = bcx.call(fn_ptr, &llargs, cleanup_bundle);
@@ -583,7 +584,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                             val: Immediate(llret),
                             ty: sig.output(),
                         };
-                        self.store_return(&bcx, ret_dest, fn_ty.ret, op);
+                        self.store_return(&bcx, ret_dest, &fn_ty.ret, op);
                         funclet_br(self, bcx, target);
                     } else {
                         bcx.unreachable();
@@ -597,7 +598,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                       bcx: &Builder<'a, 'tcx>,
                       op: OperandRef<'tcx>,
                       llargs: &mut Vec<ValueRef>,
-                      fn_ty: &FnType,
+                      fn_ty: &FnType<'tcx>,
                       next_idx: &mut usize,
                       llfn: &mut Option<ValueRef>,
                       def: &Option<ty::InstanceDef<'tcx>>) {
@@ -640,7 +641,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
         let (mut llval, align, by_ref) = match op.val {
             Immediate(_) | Pair(..) => {
                 if arg.is_indirect() || arg.cast.is_some() {
-                    let llscratch = bcx.alloca(arg.original_ty, "arg");
+                    let llscratch = bcx.alloca(arg.memory_ty(bcx.ccx), "arg");
                     self.store_operand(bcx, llscratch, None, op);
                     (llscratch, Alignment::AbiAligned, true)
                 } else {
@@ -652,7 +653,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                 // think that ATM (Rust 1.16) we only pass temporaries, but we shouldn't
                 // have scary latent bugs around.
 
-                let llscratch = bcx.alloca(arg.original_ty, "arg");
+                let llscratch = bcx.alloca(arg.memory_ty(bcx.ccx), "arg");
                 base::memcpy_ty(bcx, llscratch, llval, op.ty, Some(1));
                 (llscratch, Alignment::AbiAligned, true)
             }
@@ -661,13 +662,13 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
 
         if by_ref && !arg.is_indirect() {
             // Have to load the argument, maybe while casting it.
-            if arg.original_ty == Type::i1(bcx.ccx) {
+            if arg.layout.ty == bcx.tcx().types.bool {
                 // We store bools as i8 so we need to truncate to i1.
                 llval = bcx.load_range_assert(llval, 0, 2, llvm::False, None);
-                llval = bcx.trunc(llval, arg.original_ty);
+                llval = bcx.trunc(llval, Type::i1(bcx.ccx));
             } else if let Some(ty) = arg.cast {
                 llval = bcx.load(bcx.pointercast(llval, ty.ptr_to()),
-                                 align.min_with(llalign_of_min(bcx.ccx, arg.ty)));
+                                 align.min_with(arg.layout.align(bcx.ccx).abi() as u32));
             } else {
                 llval = bcx.load(llval, align.to_align());
             }
@@ -680,7 +681,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                                 bcx: &Builder<'a, 'tcx>,
                                 operand: &mir::Operand<'tcx>,
                                 llargs: &mut Vec<ValueRef>,
-                                fn_ty: &FnType,
+                                fn_ty: &FnType<'tcx>,
                                 next_idx: &mut usize,
                                 llfn: &mut Option<ValueRef>,
                                 def: &Option<ty::InstanceDef<'tcx>>) {
@@ -910,7 +911,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
         let cast_ptr = bcx.pointercast(dst.llval, llty.ptr_to());
         let in_type = val.ty;
         let out_type = dst.ty.to_ty(bcx.tcx());;
-        let llalign = cmp::min(align_of(bcx.ccx, in_type), align_of(bcx.ccx, out_type));
+        let llalign = cmp::min(bcx.ccx.align_of(in_type), bcx.ccx.align_of(out_type));
         self.store_operand(bcx, cast_ptr, Some(llalign), val);
     }
 
@@ -919,7 +920,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
     fn store_return(&mut self,
                     bcx: &Builder<'a, 'tcx>,
                     dest: ReturnDest,
-                    ret_ty: ArgType,
+                    ret_ty: &ArgType<'tcx>,
                     op: OperandRef<'tcx>) {
         use self::ReturnDest::*;
 
diff --git a/src/librustc_trans/mir/constant.rs b/src/librustc_trans/mir/constant.rs
index dbd928194c0..4d5b691c86e 100644
--- a/src/librustc_trans/mir/constant.rs
+++ b/src/librustc_trans/mir/constant.rs
@@ -18,7 +18,8 @@ use rustc::hir::def_id::DefId;
 use rustc::infer::TransNormalize;
 use rustc::mir;
 use rustc::mir::tcx::LvalueTy;
-use rustc::ty::{self, layout, Ty, TyCtxt, TypeFoldable};
+use rustc::ty::{self, Ty, TyCtxt, TypeFoldable};
+use rustc::ty::layout::{self, LayoutTyper};
 use rustc::ty::cast::{CastTy, IntTy};
 use rustc::ty::subst::{Kind, Substs, Subst};
 use rustc_data_structures::indexed_vec::{Idx, IndexVec};
@@ -148,7 +149,7 @@ impl<'tcx> Const<'tcx> {
         } else {
             // Otherwise, or if the value is not immediate, we create
             // a constant LLVM global and cast its address if necessary.
-            let align = type_of::align_of(ccx, self.ty);
+            let align = ccx.align_of(self.ty);
             let ptr = consts::addr_of(ccx, self.llval, align, "const");
             OperandValue::Ref(consts::ptrcast(ptr, llty.ptr_to()), Alignment::AbiAligned)
         };
@@ -717,7 +718,7 @@ impl<'a, 'tcx> MirConstContext<'a, 'tcx> {
                     Base::Value(llval) => {
                         // FIXME: may be wrong for &*(&simd_vec as &fmt::Debug)
                         let align = if self.ccx.shared().type_is_sized(ty) {
-                            type_of::align_of(self.ccx, ty)
+                            self.ccx.align_of(ty)
                         } else {
                             self.ccx.tcx().data_layout.pointer_align.abi() as machine::llalign
                         };
@@ -979,7 +980,6 @@ fn trans_const<'a, 'tcx>(
     vals: &[ValueRef]
 ) -> ValueRef {
     let l = ccx.layout_of(t);
-    let dl = &ccx.tcx().data_layout;
     let variant_index = match *kind {
         mir::AggregateKind::Adt(_, index, _, _) => index,
         _ => 0,
@@ -1002,7 +1002,7 @@ fn trans_const<'a, 'tcx>(
             let mut vals_with_discr = vec![lldiscr];
             vals_with_discr.extend_from_slice(vals);
             let mut contents = build_const_struct(ccx, &variant, &vals_with_discr[..]);
-            let needed_padding = l.size(dl).bytes() - variant.stride().bytes();
+            let needed_padding = l.size(ccx).bytes() - variant.stride().bytes();
             if needed_padding > 0 {
                 contents.push(padding(ccx, needed_padding));
             }
@@ -1022,25 +1022,20 @@ fn trans_const<'a, 'tcx>(
             C_vector(vals)
         }
         layout::RawNullablePointer { nndiscr, .. } => {
-            let nnty = adt::compute_fields(ccx, t, nndiscr as usize, false)[0];
             if variant_index as u64 == nndiscr {
                 assert_eq!(vals.len(), 1);
                 vals[0]
             } else {
-                C_null(type_of::sizing_type_of(ccx, nnty))
+                C_null(type_of::type_of(ccx, t))
             }
         }
         layout::StructWrappedNullablePointer { ref nonnull, nndiscr, .. } => {
             if variant_index as u64 == nndiscr {
                 C_struct(ccx, &build_const_struct(ccx, &nonnull, vals), false)
             } else {
-                let fields = adt::compute_fields(ccx, t, nndiscr as usize, false);
-                let vals = fields.iter().map(|&ty| {
-                    // Always use null even if it's not the `discrfield`th
-                    // field; see #8506.
-                    C_null(type_of::sizing_type_of(ccx, ty))
-                }).collect::<Vec<ValueRef>>();
-                C_struct(ccx, &build_const_struct(ccx, &nonnull, &vals[..]), false)
+                // Always use null even if it's not the `discrfield`th
+                // field; see #8506.
+                C_null(type_of::type_of(ccx, t))
             }
         }
         _ => bug!("trans_const: cannot handle type {} repreented as {:#?}", t, l)
diff --git a/src/librustc_trans/mir/lvalue.rs b/src/librustc_trans/mir/lvalue.rs
index dd8c1d0e1f0..fc889604ab8 100644
--- a/src/librustc_trans/mir/lvalue.rs
+++ b/src/librustc_trans/mir/lvalue.rs
@@ -9,7 +9,8 @@
 // except according to those terms.
 
 use llvm::ValueRef;
-use rustc::ty::{self, layout, Ty, TypeFoldable};
+use rustc::ty::{self, Ty, TypeFoldable};
+use rustc::ty::layout::{self, LayoutTyper};
 use rustc::mir;
 use rustc::mir::tcx::LvalueTy;
 use rustc_data_structures::indexed_vec::Idx;
diff --git a/src/librustc_trans/mir/mod.rs b/src/librustc_trans/mir/mod.rs
index 21bbbea77d4..c8d15d28708 100644
--- a/src/librustc_trans/mir/mod.rs
+++ b/src/librustc_trans/mir/mod.rs
@@ -11,7 +11,8 @@
 use libc::c_uint;
 use llvm::{self, ValueRef, BasicBlockRef};
 use llvm::debuginfo::DIScope;
-use rustc::ty::{self, layout};
+use rustc::ty;
+use rustc::ty::layout::{self, LayoutTyper};
 use rustc::mir::{self, Mir};
 use rustc::mir::tcx::LvalueTy;
 use rustc::ty::subst::Substs;
@@ -52,7 +53,7 @@ pub struct MirContext<'a, 'tcx:'a> {
 
     ccx: &'a CrateContext<'a, 'tcx>,
 
-    fn_ty: FnType,
+    fn_ty: FnType<'tcx>,
 
     /// When unwinding is initiated, we have to store this personality
     /// value somewhere so that we can load it and re-use it in the
@@ -454,6 +455,23 @@ fn arg_local_refs<'a, 'tcx>(bcx: &Builder<'a, 'tcx>,
                 assert_eq!((meta.cast, meta.pad), (None, None));
                 let llmeta = llvm::get_param(bcx.llfn(), llarg_idx as c_uint);
                 llarg_idx += 1;
+
+                // FIXME(eddyb) As we can't perfectly represent the data and/or
+                // vtable pointer in a fat pointers in Rust's typesystem, and
+                // because we split fat pointers into two ArgType's, they're
+                // not the right type so we have to cast them for now.
+                let pointee = match arg_ty.sty {
+                    ty::TyRef(_, ty::TypeAndMut{ty, ..}) |
+                    ty::TyRawPtr(ty::TypeAndMut{ty, ..}) => ty,
+                    ty::TyAdt(def, _) if def.is_box() => arg_ty.boxed_ty(),
+                    _ => bug!()
+                };
+                let data_llty = type_of::in_memory_type_of(bcx.ccx, pointee);
+                let meta_llty = type_of::unsized_info_ty(bcx.ccx, pointee);
+
+                let llarg = bcx.pointercast(llarg, data_llty.ptr_to());
+                let llmeta = bcx.pointercast(llmeta, meta_llty);
+
                 OperandValue::Pair(llarg, llmeta)
             } else {
                 OperandValue::Immediate(llarg)
diff --git a/src/librustc_trans/mir/operand.rs b/src/librustc_trans/mir/operand.rs
index da24c03fdc2..771a88238b2 100644
--- a/src/librustc_trans/mir/operand.rs
+++ b/src/librustc_trans/mir/operand.rs
@@ -10,7 +10,7 @@
 
 use llvm::ValueRef;
 use rustc::ty::{self, Ty};
-use rustc::ty::layout::Layout;
+use rustc::ty::layout::{Layout, LayoutTyper};
 use rustc::mir;
 use rustc::mir::tcx::LvalueTy;
 use rustc_data_structures::indexed_vec::Idx;
diff --git a/src/librustc_trans/mir/rvalue.rs b/src/librustc_trans/mir/rvalue.rs
index d487aa6cd5b..8f7cb914c47 100644
--- a/src/librustc_trans/mir/rvalue.rs
+++ b/src/librustc_trans/mir/rvalue.rs
@@ -11,7 +11,7 @@
 use llvm::{self, ValueRef};
 use rustc::ty::{self, Ty};
 use rustc::ty::cast::{CastTy, IntTy};
-use rustc::ty::layout::Layout;
+use rustc::ty::layout::{Layout, LayoutTyper};
 use rustc::mir::tcx::LvalueTy;
 use rustc::mir;
 use middle::lang_items::ExchangeMallocFnLangItem;
@@ -438,7 +438,7 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
                 let content_ty: Ty<'tcx> = self.monomorphize(&content_ty);
                 let llty = type_of::type_of(bcx.ccx, content_ty);
                 let llsize = machine::llsize_of(bcx.ccx, llty);
-                let align = type_of::align_of(bcx.ccx, content_ty);
+                let align = bcx.ccx.align_of(content_ty);
                 let llalign = C_uint(bcx.ccx, align);
                 let llty_ptr = llty.ptr_to();
                 let box_ty = bcx.tcx().mk_box(content_ty);
diff --git a/src/librustc_trans/type_of.rs b/src/librustc_trans/type_of.rs
index a5722e6e520..d4ab6b07828 100644
--- a/src/librustc_trans/type_of.rs
+++ b/src/librustc_trans/type_of.rs
@@ -13,127 +13,12 @@ use adt;
 use common::*;
 use machine;
 use rustc::ty::{self, Ty, TypeFoldable};
+use rustc::ty::layout::LayoutTyper;
 use trans_item::DefPathBasedNames;
 use type_::Type;
 
 use syntax::ast;
 
-
-// A "sizing type" is an LLVM type, the size and alignment of which are
-// guaranteed to be equivalent to what you would get out of `type_of()`. It's
-// useful because:
-//
-// (1) It may be cheaper to compute the sizing type than the full type if all
-//     you're interested in is the size and/or alignment;
-//
-// (2) It won't make any recursive calls to determine the structure of the
-//     type behind pointers. This can help prevent infinite loops for
-//     recursive types. For example, enum types rely on this behavior.
-
-pub fn sizing_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>) -> Type {
-    if let Some(t) = cx.llsizingtypes().borrow().get(&t).cloned() {
-        return t;
-    }
-
-    debug!("sizing_type_of {:?}", t);
-    let _recursion_lock = cx.enter_type_of(t);
-
-    let ptr_sizing_ty = |ty: Ty<'tcx>| {
-        if cx.shared().type_is_sized(ty) {
-            Type::i8p(cx)
-        } else {
-            Type::struct_(cx, &[Type::i8p(cx), unsized_info_ty(cx, ty)], false)
-        }
-    };
-    let llsizingty = match t.sty {
-        _ if !cx.shared().type_is_sized(t) => {
-            Type::struct_(cx, &[Type::i8p(cx), unsized_info_ty(cx, t)], false)
-        }
-
-        ty::TyBool => Type::bool(cx),
-        ty::TyChar => Type::char(cx),
-        ty::TyInt(t) => Type::int_from_ty(cx, t),
-        ty::TyUint(t) => Type::uint_from_ty(cx, t),
-        ty::TyFloat(t) => Type::float_from_ty(cx, t),
-        ty::TyNever => Type::nil(cx),
-
-        ty::TyRef(_, ty::TypeAndMut{ty, ..}) |
-        ty::TyRawPtr(ty::TypeAndMut{ty, ..}) => {
-            ptr_sizing_ty(ty)
-        }
-        ty::TyAdt(def, _) if def.is_box() => {
-            ptr_sizing_ty(t.boxed_ty())
-        }
-
-        ty::TyFnDef(..) => Type::nil(cx),
-        ty::TyFnPtr(_) => Type::i8p(cx),
-
-        ty::TyArray(ty, size) => {
-            let llty = sizing_type_of(cx, ty);
-            let size = size as u64;
-            Type::array(&llty, size)
-        }
-
-        ty::TyTuple(ref tys, _) if tys.is_empty() => {
-            Type::nil(cx)
-        }
-
-        ty::TyAdt(..) if t.is_simd() => {
-            let e = t.simd_type(cx.tcx());
-            if !e.is_machine() {
-                cx.sess().fatal(&format!("monomorphising SIMD type `{}` with \
-                                          a non-machine element type `{}`",
-                                         t, e))
-            }
-            let llet = type_of(cx, e);
-            let n = t.simd_size(cx.tcx()) as u64;
-            Type::vector(&llet, n)
-        }
-
-        ty::TyTuple(..) | ty::TyAdt(..) | ty::TyClosure(..) => {
-            adt::sizing_type_of(cx, t, false)
-        }
-
-        ty::TyProjection(..) | ty::TyInfer(..) | ty::TyParam(..) |
-        ty::TyAnon(..) | ty::TyError => {
-            bug!("fictitious type {:?} in sizing_type_of()", t)
-        }
-        ty::TySlice(_) | ty::TyDynamic(..) | ty::TyStr => bug!()
-    };
-
-    debug!("--> mapped t={:?} to llsizingty={:?}", t, llsizingty);
-
-    cx.llsizingtypes().borrow_mut().insert(t, llsizingty);
-
-    // FIXME(eddyb) Temporary sanity check for ty::layout.
-    let layout = cx.layout_of(t);
-    if !cx.shared().type_is_sized(t) {
-        if !layout.is_unsized() {
-            bug!("layout should be unsized for type `{}` / {:#?}",
-                 t, layout);
-        }
-
-        // Unsized types get turned into a fat pointer for LLVM.
-        return llsizingty;
-    }
-
-    let r = layout.size(&cx.tcx().data_layout).bytes();
-    let l = machine::llsize_of_alloc(cx, llsizingty);
-    if r != l {
-        bug!("size differs (rustc: {}, llvm: {}) for type `{}` / {:#?}",
-             r, l, t, layout);
-    }
-
-    let r = layout.align(&cx.tcx().data_layout).abi();
-    let l = machine::llalign_of_min(cx, llsizingty) as u64;
-    if r != l {
-        bug!("align differs (rustc: {}, llvm: {}) for type `{}` / {:#?}",
-             r, l, t, layout);
-    }
-
-    llsizingty
-}
-
 pub fn fat_ptr_base_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> Type {
     match ty.sty {
         ty::TyRef(_, ty::TypeAndMut { ty: t, .. }) |
@@ -147,7 +32,7 @@ pub fn fat_ptr_base_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) ->
     }
 }
 
-fn unsized_info_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> Type {
+pub fn unsized_info_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> Type {
     let unsized_part = ccx.tcx().struct_tail(ty);
     match unsized_part.sty {
         ty::TyStr | ty::TyArray(..) | ty::TySlice(_) => {
@@ -196,7 +81,6 @@ pub fn type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> Type {
 /// of that field's type - this is useful for taking the address of
 /// that field and ensuring the struct has the right alignment.
 /// For the LLVM type of a value as a whole, see `type_of`.
-/// NB: If you update this, be sure to update `sizing_type_of()` as well.
 pub fn in_memory_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>) -> Type {
     // Check the cache.
     if let Some(&llty) = cx.lltypes().borrow().get(&t) {
@@ -322,10 +206,14 @@ pub fn in_memory_type_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>) ->
     llty
 }
 
-pub fn align_of<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>)
-                          -> machine::llalign {
-    let layout = cx.layout_of(t);
-    layout.align(&cx.tcx().data_layout).abi() as machine::llalign
+impl<'a, 'tcx> CrateContext<'a, 'tcx> {
+    pub fn align_of(&self, ty: Ty<'tcx>) -> machine::llalign {
+        self.layout_of(ty).align(self).abi() as machine::llalign
+    }
+
+    pub fn size_of(&self, ty: Ty<'tcx>) -> machine::llsize {
+        self.layout_of(ty).size(self).bytes() as machine::llsize
+    }
 }
 
 fn llvm_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, ty: Ty<'tcx>) -> String {
diff --git a/src/test/codegen/function-arguments.rs b/src/test/codegen/function-arguments.rs
index 76313b158ab..bc84ac49da9 100644
--- a/src/test/codegen/function-arguments.rs
+++ b/src/test/codegen/function-arguments.rs
@@ -121,13 +121,13 @@ pub fn unsafe_slice(_: &[UnsafeInner]) {
 fn str(_: &[u8]) {
 }
 
-// CHECK: @trait_borrow(i8* nonnull, void (i8*)** noalias nonnull readonly)
+// CHECK: @trait_borrow({}* nonnull, {}* noalias nonnull readonly)
 // FIXME #25759 This should also have `nocapture`
 #[no_mangle]
 fn trait_borrow(_: &Drop) {
 }
 
-// CHECK: @trait_box(i8* noalias nonnull, void (i8*)** noalias nonnull readonly)
+// CHECK: @trait_box({}* noalias nonnull, {}* noalias nonnull readonly)
 #[no_mangle]
 fn trait_box(_: Box<Drop>) {
 }