compiler: Parse p- specs in datalayout string, allow definition of custom default data address space

Author: xdoardo

src/common.rs

@@ -162,7 +162,7 @@ impl<'gcc, 'tcx> ConstCodegenMethods for CodegenCx<'gcc, 'tcx> {
     }
 
     fn const_usize(&self, i: u64) -> RValue<'gcc> {
-        let bit_size = self.data_layout().pointer_size.bits();
+        let bit_size = self.data_layout().pointer_size().bits();
         if bit_size < 64 {
             // make sure it doesn't overflow
             assert!(i < (1 << bit_size));

src/consts.rs

@@ -294,7 +294,7 @@ pub(crate) fn const_alloc_to_gcc_uncached<'gcc>(
     let alloc = alloc.inner();
     let mut llvals = Vec::with_capacity(alloc.provenance().ptrs().len() + 1);
     let dl = cx.data_layout();
-    let pointer_size = dl.pointer_size.bytes() as usize;
+    let pointer_size = dl.pointer_size().bytes() as usize;
 
     let mut next_offset = 0;
     for &(offset, prov) in alloc.provenance().ptrs().iter() {
@@ -331,7 +331,7 @@ pub(crate) fn const_alloc_to_gcc_uncached<'gcc>(
             ),
             abi::Scalar::Initialized {
                 value: Primitive::Pointer(address_space),
-                valid_range: WrappingRange::full(dl.pointer_size),
+                valid_range: WrappingRange::full(dl.pointer_size()),
             },
             cx.type_i8p_ext(address_space),
         ));

src/intrinsic/mod.rs

@@ -541,7 +541,7 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tc
                         // For rusty ABIs, small aggregates are actually passed
                         // as `RegKind::Integer` (see `FnAbi::adjust_for_abi`),
                         // so we re-use that same threshold here.
-                        layout.size() <= self.data_layout().pointer_size * 2
+                        layout.size() <= self.data_layout().pointer_size() * 2
                     }
                 };
 

src/intrinsic/simd.rs

@@ -1184,7 +1184,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let lhs = args[0].immediate();
         let rhs = args[1].immediate();
         let is_add = name == sym::simd_saturating_add;
-        let ptr_bits = bx.tcx().data_layout.pointer_size.bits() as _;
+        let ptr_bits = bx.tcx().data_layout.pointer_size().bits() as _;
         let (signed, elem_width, elem_ty) = match *in_elem.kind() {
             ty::Int(i) => (true, i.bit_width().unwrap_or(ptr_bits) / 8, bx.cx.type_int_from_ty(i)),
             ty::Uint(i) => {