abi: add AddressSpace field to Primitive::Pointer

...and remove it from `PointeeInfo`, which isn't meant for this.

There are still various places (marked with FIXMEs) that assume all pointers
have the same size and alignment. Fixing this requires parsing non-default
address spaces in the data layout string, which will be done in a followup.

Author: erikdesjardins

compiler/rustc_abi/src/lib.rs

@@ -267,6 +267,9 @@ impl TargetDataLayout {
                 ["a", ref a @ ..] => dl.aggregate_align = align(a, "a")?,
                 ["f32", ref a @ ..] => dl.f32_align = align(a, "f32")?,
                 ["f64", ref a @ ..] => dl.f64_align = align(a, "f64")?,
+                // FIXME(erikdesjardins): we should be parsing nonzero address spaces
+                // this will require replacing TargetDataLayout::{pointer_size,pointer_align}
+                // with e.g. `fn pointer_size_in(AddressSpace)`
                 [p @ "p", s, ref a @ ..] | [p @ "p0", s, ref a @ ..] => {
                     dl.pointer_size = size(s, p)?;
                     dl.pointer_align = align(a, p)?;
@@ -861,7 +864,7 @@ pub enum Primitive {
     Int(Integer, bool),
     F32,
     F64,
-    Pointer,
+    Pointer(AddressSpace),
 }
 
 impl Primitive {
@@ -872,7 +875,10 @@ impl Primitive {
             Int(i, _) => i.size(),
             F32 => Size::from_bits(32),
             F64 => Size::from_bits(64),
-            Pointer => dl.pointer_size,
+            // FIXME(erikdesjardins): ignoring address space is technically wrong, pointers in
+            // different address spaces can have different sizes
+            // (but TargetDataLayout doesn't currently parse that part of the DL string)
+            Pointer(_) => dl.pointer_size,
         }
     }
 
@@ -883,14 +889,12 @@ impl Primitive {
             Int(i, _) => i.align(dl),
             F32 => dl.f32_align,
             F64 => dl.f64_align,
-            Pointer => dl.pointer_align,
+            // FIXME(erikdesjardins): ignoring address space is technically wrong, pointers in
+            // different address spaces can have different alignments
+            // (but TargetDataLayout doesn't currently parse that part of the DL string)
+            Pointer(_) => dl.pointer_align,
         }
     }
-
-    #[inline]
-    pub fn is_ptr(self) -> bool {
-        matches!(self, Pointer)
-    }
 }
 
 /// Inclusive wrap-around range of valid values, that is, if
@@ -1176,7 +1180,8 @@ impl FieldsShape {
 /// An identifier that specifies the address space that some operation
 /// should operate on. Special address spaces have an effect on code generation,
 /// depending on the target and the address spaces it implements.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[cfg_attr(feature = "nightly", derive(HashStable_Generic))]
 pub struct AddressSpace(pub u32);
 
 impl AddressSpace {
@@ -1456,7 +1461,6 @@ pub struct PointeeInfo {
     pub size: Size,
     pub align: Align,
     pub safe: Option<PointerKind>,
-    pub address_space: AddressSpace,
 }
 
 /// Used in `might_permit_raw_init` to indicate the kind of initialisation

compiler/rustc_codegen_cranelift/src/common.rs

@@ -35,7 +35,8 @@ pub(crate) fn scalar_to_clif_type(tcx: TyCtxt<'_>, scalar: Scalar) -> Type {
         },
         Primitive::F32 => types::F32,
         Primitive::F64 => types::F64,
-        Primitive::Pointer => pointer_ty(tcx),
+        // FIXME(erikdesjardins): handle non-default addrspace ptr sizes
+        Primitive::Pointer(_) => pointer_ty(tcx),
     }
 }
 

compiler/rustc_codegen_gcc/src/builder.rs

@@ -709,7 +709,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
                         bx.range_metadata(load, vr);
                     }
                 }
-                abi::Pointer if vr.start < vr.end && !vr.contains(0) => {
+                abi::Pointer(_) if vr.start < vr.end && !vr.contains(0) => {
                     bx.nonnull_metadata(load);
                 }
                 _ => {}

compiler/rustc_codegen_gcc/src/common.rs

@@ -211,7 +211,7 @@ impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                 let base_addr = self.const_bitcast(base_addr, self.usize_type);
                 let offset = self.context.new_rvalue_from_long(self.usize_type, offset.bytes() as i64);
                 let ptr = self.const_bitcast(base_addr + offset, ptr_type);
-                if layout.primitive() != Pointer {
+                if !matches!(layout.primitive(), Pointer(_)) {
                     self.const_bitcast(ptr.dereference(None).to_rvalue(), ty)
                 }
                 else {

compiler/rustc_codegen_gcc/src/consts.rs

@@ -7,9 +7,9 @@ use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs}
 use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::ty::{self, Instance, Ty};
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::mir::interpret::{self, ConstAllocation, ErrorHandled, Scalar as InterpScalar, read_target_uint};
+use rustc_middle::mir::interpret::{self, ConstAllocation, ErrorHandled, GlobalAlloc, Scalar as InterpScalar, read_target_uint};
 use rustc_span::def_id::DefId;
-use rustc_target::abi::{self, Align, HasDataLayout, Primitive, Size, WrappingRange};
+use rustc_target::abi::{self, AddressSpace, Align, HasDataLayout, Primitive, Size, WrappingRange};
 
 use crate::base;
 use crate::context::CodegenCx;
@@ -322,13 +322,21 @@ pub fn const_alloc_to_gcc<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, alloc: ConstAl
             )
             .expect("const_alloc_to_llvm: could not read relocation pointer")
             as u64;
+
+        let address_space = match cx.tcx.global_alloc(alloc_id) {
+            GlobalAlloc::Function(..) => cx.data_layout().instruction_address_space,
+            GlobalAlloc::Static(..) | GlobalAlloc::Memory(..) | GlobalAlloc::VTable(..) => {
+                AddressSpace::DATA
+            }
+        };
+
         llvals.push(cx.scalar_to_backend(
             InterpScalar::from_pointer(
                 interpret::Pointer::new(alloc_id, Size::from_bytes(ptr_offset)),
                 &cx.tcx,
             ),
-            abi::Scalar::Initialized { value: Primitive::Pointer, valid_range: WrappingRange::full(dl.pointer_size) },
-            cx.type_i8p(),
+            abi::Scalar::Initialized { value: Primitive::Pointer(address_space), valid_range: WrappingRange::full(dl.pointer_size) },
+            cx.type_i8p_ext(address_space),
         ));
         next_offset = offset + pointer_size;
     }

compiler/rustc_codegen_gcc/src/type_of.rs

@@ -253,7 +253,7 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
             Int(i, false) => cx.type_from_unsigned_integer(i),
             F32 => cx.type_f32(),
             F64 => cx.type_f64(),
-            Pointer => {
+            Pointer(address_space) => {
                 // If we know the alignment, pick something better than i8.
                 let pointee =
                     if let Some(pointee) = self.pointee_info_at(cx, offset) {
@@ -262,7 +262,7 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
                     else {
                         cx.type_i8()
                     };
-                cx.type_ptr_to(pointee)
+                cx.type_ptr_to_ext(pointee, address_space)
             }
         }
     }

compiler/rustc_codegen_llvm/src/asm.rs

@@ -849,14 +849,16 @@ fn dummy_output_type<'ll>(cx: &CodegenCx<'ll, '_>, reg: InlineAsmRegClass) -> &'
 /// Helper function to get the LLVM type for a Scalar. Pointers are returned as
 /// the equivalent integer type.
 fn llvm_asm_scalar_type<'ll>(cx: &CodegenCx<'ll, '_>, scalar: Scalar) -> &'ll Type {
+    let dl = &cx.tcx.data_layout;
     match scalar.primitive() {
         Primitive::Int(Integer::I8, _) => cx.type_i8(),
         Primitive::Int(Integer::I16, _) => cx.type_i16(),
         Primitive::Int(Integer::I32, _) => cx.type_i32(),
         Primitive::Int(Integer::I64, _) => cx.type_i64(),
         Primitive::F32 => cx.type_f32(),
         Primitive::F64 => cx.type_f64(),
-        Primitive::Pointer => cx.type_isize(),
+        // FIXME(erikdesjardins): handle non-default addrspace ptr sizes
+        Primitive::Pointer(_) => cx.type_from_integer(dl.ptr_sized_integer()),
         _ => unreachable!(),
     }
 }
@@ -868,6 +870,7 @@ fn llvm_fixup_input<'ll, 'tcx>(
     reg: InlineAsmRegClass,
     layout: &TyAndLayout<'tcx>,
 ) -> &'ll Value {
+    let dl = &bx.tcx.data_layout;
     match (reg, layout.abi) {
         (InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg), Abi::Scalar(s)) => {
             if let Primitive::Int(Integer::I8, _) = s.primitive() {
@@ -881,8 +884,10 @@ fn llvm_fixup_input<'ll, 'tcx>(
             let elem_ty = llvm_asm_scalar_type(bx.cx, s);
             let count = 16 / layout.size.bytes();
             let vec_ty = bx.cx.type_vector(elem_ty, count);
-            if let Primitive::Pointer = s.primitive() {
-                value = bx.ptrtoint(value, bx.cx.type_isize());
+            // FIXME(erikdesjardins): handle non-default addrspace ptr sizes
+            if let Primitive::Pointer(_) = s.primitive() {
+                let t = bx.type_from_integer(dl.ptr_sized_integer());
+                value = bx.ptrtoint(value, t);
             }
             bx.insert_element(bx.const_undef(vec_ty), value, bx.const_i32(0))
         }
@@ -958,7 +963,7 @@ fn llvm_fixup_output<'ll, 'tcx>(
         }
         (InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg_low16), Abi::Scalar(s)) => {
             value = bx.extract_element(value, bx.const_i32(0));
-            if let Primitive::Pointer = s.primitive() {
+            if let Primitive::Pointer(_) = s.primitive() {
                 value = bx.inttoptr(value, layout.llvm_type(bx.cx));
             }
             value

compiler/rustc_codegen_llvm/src/builder.rs

@@ -511,7 +511,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
                         bx.range_metadata(load, scalar.valid_range(bx));
                     }
                 }
-                abi::Pointer => {
+                abi::Pointer(_) => {
                     if !scalar.valid_range(bx).contains(0) {
                         bx.nonnull_metadata(load);
                     }

compiler/rustc_codegen_llvm/src/common.rs

@@ -236,7 +236,7 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
             Scalar::Int(int) => {
                 let data = int.assert_bits(layout.size(self));
                 let llval = self.const_uint_big(self.type_ix(bitsize), data);
-                if layout.primitive() == Pointer {
+                if matches!(layout.primitive(), Pointer(_)) {
                     unsafe { llvm::LLVMConstIntToPtr(llval, llty) }
                 } else {
                     self.const_bitcast(llval, llty)
@@ -284,7 +284,7 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
                         1,
                     )
                 };
-                if layout.primitive() != Pointer {
+                if !matches!(layout.primitive(), Pointer(_)) {
                     unsafe { llvm::LLVMConstPtrToInt(llval, llty) }
                 } else {
                     self.const_bitcast(llval, llty)

compiler/rustc_codegen_llvm/src/consts.rs

@@ -111,7 +111,7 @@ pub fn const_alloc_to_llvm<'ll>(cx: &CodegenCx<'ll, '_>, alloc: ConstAllocation<
                 &cx.tcx,
             ),
             Scalar::Initialized {
-                value: Primitive::Pointer,
+                value: Primitive::Pointer(address_space),
                 valid_range: WrappingRange::full(dl.pointer_size),
             },
             cx.type_i8p_ext(address_space),