compiler/rustc_codegen_gcc/src/common.rs - third_party/rust - Git at Google

 use gccjit::{LValue, RValue, ToRValue, Type};
 use rustc_codegen_ssa::traits::{
     BaseTypeCodegenMethods, ConstCodegenMethods, MiscCodegenMethods, StaticCodegenMethods,
 };
 use rustc_middle::mir::interpret::{ConstAllocation, GlobalAlloc, Scalar};
 use rustc_middle::mir::Mutability;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_target::abi::{self, HasDataLayout, Pointer};

 use crate::consts::const_alloc_to_gcc;
 use crate::context::CodegenCx;
 use crate::type_of::LayoutGccExt;

 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     pub fn const_ptrcast(&self, val: RValue<'gcc>, ty: Type<'gcc>) -> RValue<'gcc> {
         self.context.new_cast(None, val, ty)
     }

     pub fn const_bytes(&self, bytes: &[u8]) -> RValue<'gcc> {
         bytes_in_context(self, bytes)
     }

     fn global_string(&self, string: &str) -> LValue<'gcc> {
         // TODO(antoyo): handle non-null-terminated strings.
         let string = self.context.new_string_literal(string);
         let sym = self.generate_local_symbol_name("str");
         let global = self.declare_private_global(&sym, self.val_ty(string));
         global.global_set_initializer_rvalue(string);
         global
         // TODO(antoyo): set linkage.
     }

     pub fn const_bitcast(&self, value: RValue<'gcc>, typ: Type<'gcc>) -> RValue<'gcc> {
         if value.get_type() == self.bool_type.make_pointer() {
             if let Some(pointee) = typ.get_pointee() {
                 if pointee.dyncast_vector().is_some() {
                     panic!()
                 }
             }
         }
         // NOTE: since bitcast makes a value non-constant, don't bitcast if not necessary as some
         // SIMD builtins require a constant value.
         self.bitcast_if_needed(value, typ)
     }
 }

 pub fn bytes_in_context<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, bytes: &[u8]) -> RValue<'gcc> {
     let context = &cx.context;
     let byte_type = context.new_type::<u8>();
     let typ = context.new_array_type(None, byte_type, bytes.len() as u64);
     let elements: Vec<_> =
         bytes.iter().map(|&byte| context.new_rvalue_from_int(byte_type, byte as i32)).collect();
     context.new_array_constructor(None, typ, &elements)
 }

 pub fn type_is_pointer(typ: Type<'_>) -> bool {
     typ.get_pointee().is_some()
 }

 impl<'gcc, 'tcx> ConstCodegenMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     fn const_null(&self, typ: Type<'gcc>) -> RValue<'gcc> {
         if type_is_pointer(typ) { self.context.new_null(typ) } else { self.const_int(typ, 0) }
     }

     fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {
         let local = self.current_func.borrow().expect("func").new_local(None, typ, "undefined");
         if typ.is_struct().is_some() {
             // NOTE: hack to workaround a limitation of the rustc API: see comment on
             // CodegenCx.structs_as_pointer
             let pointer = local.get_address(None);
             self.structs_as_pointer.borrow_mut().insert(pointer);
             pointer
         } else {
             local.to_rvalue()
         }
     }

     fn const_poison(&self, typ: Type<'gcc>) -> RValue<'gcc> {
         // No distinction between undef and poison.
         self.const_undef(typ)
     }

     fn const_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
         self.gcc_int(typ, int)
     }

     fn const_uint(&self, typ: Type<'gcc>, int: u64) -> RValue<'gcc> {
         self.gcc_uint(typ, int)
     }

     fn const_uint_big(&self, typ: Type<'gcc>, num: u128) -> RValue<'gcc> {
         self.gcc_uint_big(typ, num)
     }

     fn const_bool(&self, val: bool) -> RValue<'gcc> {
         self.const_uint(self.type_i1(), val as u64)
     }

     fn const_i16(&self, i: i16) -> RValue<'gcc> {
         self.const_int(self.type_i16(), i as i64)
     }

     fn const_i32(&self, i: i32) -> RValue<'gcc> {
         self.const_int(self.type_i32(), i as i64)
     }

     fn const_i8(&self, i: i8) -> RValue<'gcc> {
         self.const_int(self.type_i8(), i as i64)
     }

     fn const_u32(&self, i: u32) -> RValue<'gcc> {
         self.const_uint(self.type_u32(), i as u64)
     }

     fn const_u64(&self, i: u64) -> RValue<'gcc> {
         self.const_uint(self.type_u64(), i)
     }

     fn const_u128(&self, i: u128) -> RValue<'gcc> {
         self.const_uint_big(self.type_u128(), i)
     }

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

         self.const_uint(self.usize_type, i)
     }

     fn const_u8(&self, i: u8) -> RValue<'gcc> {
         self.const_uint(self.type_u8(), i as u64)
     }

     fn const_real(&self, typ: Type<'gcc>, val: f64) -> RValue<'gcc> {
         self.context.new_rvalue_from_double(typ, val)
     }

     fn const_str(&self, s: &str) -> (RValue<'gcc>, RValue<'gcc>) {
         let str_global = *self
             .const_str_cache
             .borrow_mut()
             .raw_entry_mut()
             .from_key(s)
             .or_insert_with(|| (s.to_owned(), self.global_string(s)))
             .1;
         let len = s.len();
         let cs = self.const_ptrcast(
             str_global.get_address(None),
             self.type_ptr_to(self.layout_of(self.tcx.types.str_).gcc_type(self)),
         );
         (cs, self.const_usize(len as u64))
     }

     fn const_struct(&self, values: &[RValue<'gcc>], packed: bool) -> RValue<'gcc> {
         let fields: Vec<_> = values.iter().map(|value| value.get_type()).collect();
         // TODO(antoyo): cache the type? It's anonymous, so probably not.
         let typ = self.type_struct(&fields, packed);
         let struct_type = typ.is_struct().expect("struct type");
         self.context.new_struct_constructor(None, struct_type.as_type(), None, values)
     }

     fn const_vector(&self, values: &[RValue<'gcc>]) -> RValue<'gcc> {
         let typ = self.type_vector(values[0].get_type(), values.len() as u64);
         self.context.new_rvalue_from_vector(None, typ, values)
     }

     fn const_to_opt_uint(&self, _v: RValue<'gcc>) -> Option<u64> {
         // TODO(antoyo)
         None
     }

     fn const_to_opt_u128(&self, _v: RValue<'gcc>, _sign_ext: bool) -> Option<u128> {
         // TODO(antoyo)
         None
     }

     fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, ty: Type<'gcc>) -> RValue<'gcc> {
         let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
         match cv {
             Scalar::Int(int) => {
                 let data = int.to_bits(layout.size(self));

                 // FIXME(antoyo): there's some issues with using the u128 code that follows, so hard-code
                 // the paths for floating-point values.
                 if ty == self.float_type {
                     return self
                         .context
                         .new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
                 }
                 if ty == self.double_type {
                     return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
                 }

                 let value = self.const_uint_big(self.type_ix(bitsize), data);
                 let bytesize = layout.size(self).bytes();
                 if bitsize > 1 && ty.is_integral() && bytesize as u32 == ty.get_size() {
                     // NOTE: since the intrinsic _xabort is called with a bitcast, which
                     // is non-const, but expects a constant, do a normal cast instead of a bitcast.
                     // FIXME(antoyo): fix bitcast to work in constant contexts.
                     // TODO(antoyo): perhaps only use bitcast for pointers?
                     self.context.new_cast(None, value, ty)
                 } else {
                     // TODO(bjorn3): assert size is correct
                     self.const_bitcast(value, ty)
                 }
             }
             Scalar::Ptr(ptr, _size) => {
                 let (prov, offset) = ptr.into_parts(); // we know the `offset` is relative
                 let alloc_id = prov.alloc_id();
                 let base_addr = match self.tcx.global_alloc(alloc_id) {
                     GlobalAlloc::Memory(alloc) => {
                         let init = const_alloc_to_gcc(self, alloc);
                         let alloc = alloc.inner();
                         let value = match alloc.mutability {
                             Mutability::Mut => self.static_addr_of_mut(init, alloc.align, None),
                             _ => self.static_addr_of(init, alloc.align, None),
                         };
                         if !self.sess().fewer_names() {
                             // TODO(antoyo): set value name.
                         }
                         value
                     }
                     GlobalAlloc::Function { instance, .. } => self.get_fn_addr(instance),
                     GlobalAlloc::VTable(ty, trait_ref) => {
                         let alloc = self
                             .tcx
                             .global_alloc(self.tcx.vtable_allocation((ty, trait_ref)))
                             .unwrap_memory();
                         let init = const_alloc_to_gcc(self, alloc);
                         self.static_addr_of(init, alloc.inner().align, None)
                     }
                     GlobalAlloc::Static(def_id) => {
                         assert!(self.tcx.is_static(def_id));
                         self.get_static(def_id).get_address(None)
                     }
                 };
                 let ptr_type = base_addr.get_type();
                 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 !matches!(layout.primitive(), Pointer(_)) {
                     self.const_bitcast(ptr.dereference(None).to_rvalue(), ty)
                 } else {
                     self.const_bitcast(ptr, ty)
                 }
             }
         }
     }

     fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value {
         const_alloc_to_gcc(self, alloc)
     }

     fn const_ptr_byte_offset(&self, base_addr: Self::Value, offset: abi::Size) -> Self::Value {
         self.context
             .new_array_access(None, base_addr, self.const_usize(offset.bytes()))
             .get_address(None)
     }
 }

 pub trait SignType<'gcc, 'tcx> {
     fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
     fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
 }

 impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
     fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_i8(cx) || self.is_i16(cx) || self.is_i32(cx) || self.is_i64(cx) || self.is_i128(cx)
     }

     fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_u8(cx) || self.is_u16(cx) || self.is_u32(cx) || self.is_u64(cx) || self.is_u128(cx)
     }

     fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
         if self.is_u8(cx) {
             cx.i8_type
         } else if self.is_u16(cx) {
             cx.i16_type
         } else if self.is_u32(cx) {
             cx.i32_type
         } else if self.is_u64(cx) {
             cx.i64_type
         } else if self.is_u128(cx) {
             cx.i128_type
         } else if self.is_uchar(cx) {
             cx.char_type
         } else if self.is_ushort(cx) {
             cx.short_type
         } else if self.is_uint(cx) {
             cx.int_type
         } else if self.is_ulong(cx) {
             cx.long_type
         } else if self.is_ulonglong(cx) {
             cx.longlong_type
         } else {
             *self
         }
     }

     fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
         if self.is_i8(cx) {
             cx.u8_type
         } else if self.is_i16(cx) {
             cx.u16_type
         } else if self.is_i32(cx) {
             cx.u32_type
         } else if self.is_i64(cx) {
             cx.u64_type
         } else if self.is_i128(cx) {
             cx.u128_type
         } else if self.is_char(cx) {
             cx.uchar_type
         } else if self.is_short(cx) {
             cx.ushort_type
         } else if self.is_int(cx) {
             cx.uint_type
         } else if self.is_long(cx) {
             cx.ulong_type
         } else if self.is_longlong(cx) {
             cx.ulonglong_type
         } else {
             *self
         }
     }
 }

 pub trait TypeReflection<'gcc, 'tcx> {
     fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;

     fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
     fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;

     fn is_vector(&self) -> bool;
 }

 impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
     fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.uchar_type
     }

     fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.ushort_type
     }

     fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.uint_type
     }

     fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.ulong_type
     }

     fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.ulonglong_type
     }

     fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.char_type
     }

     fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.short_type
     }

     fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.int_type
     }

     fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.long_type
     }

     fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.longlong_type
     }

     fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.i8_type)
     }

     fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.u8_type)
     }

     fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.i16_type)
     }

     fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.u16_type)
     }

     fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.i32_type)
     }

     fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.u32_type)
     }

     fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.i64_type)
     }

     fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.is_compatible_with(cx.u64_type)
     }

     fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.i128_type.unqualified()
     }

     fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
         self.unqualified() == cx.u128_type.unqualified()
     }

     fn is_vector(&self) -> bool {
         let mut typ = *self;
         loop {
             if typ.dyncast_vector().is_some() {
                 return true;
             }

             let old_type = typ;
             typ = typ.unqualified();
             if old_type == typ {
                 break;
             }
         }

         false
     }
 }
	use gccjit::{LValue, RValue, ToRValue, Type};
	use rustc_codegen_ssa::traits::{
	BaseTypeCodegenMethods, ConstCodegenMethods, MiscCodegenMethods, StaticCodegenMethods,
	};
	use rustc_middle::mir::interpret::{ConstAllocation, GlobalAlloc, Scalar};
	use rustc_middle::mir::Mutability;
	use rustc_middle::ty::layout::LayoutOf;
	use rustc_target::abi::{self, HasDataLayout, Pointer};

	use crate::consts::const_alloc_to_gcc;
	use crate::context::CodegenCx;
	use crate::type_of::LayoutGccExt;

	impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
	pub fn const_ptrcast(&self, val: RValue<'gcc>, ty: Type<'gcc>) -> RValue<'gcc> {
	self.context.new_cast(None, val, ty)
	}

	pub fn const_bytes(&self, bytes: &[u8]) -> RValue<'gcc> {
	bytes_in_context(self, bytes)
	}

	fn global_string(&self, string: &str) -> LValue<'gcc> {
	// TODO(antoyo): handle non-null-terminated strings.
	let string = self.context.new_string_literal(string);
	let sym = self.generate_local_symbol_name("str");
	let global = self.declare_private_global(&sym, self.val_ty(string));
	global.global_set_initializer_rvalue(string);
	global
	// TODO(antoyo): set linkage.
	}

	pub fn const_bitcast(&self, value: RValue<'gcc>, typ: Type<'gcc>) -> RValue<'gcc> {
	if value.get_type() == self.bool_type.make_pointer() {
	if let Some(pointee) = typ.get_pointee() {
	if pointee.dyncast_vector().is_some() {
	panic!()
	}
	}
	}
	// NOTE: since bitcast makes a value non-constant, don't bitcast if not necessary as some
	// SIMD builtins require a constant value.
	self.bitcast_if_needed(value, typ)
	}
	}

	pub fn bytes_in_context<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, bytes: &[u8]) -> RValue<'gcc> {
	let context = &cx.context;
	let byte_type = context.new_type::<u8>();
	let typ = context.new_array_type(None, byte_type, bytes.len() as u64);
	let elements: Vec<_> =
	bytes.iter().map(\|&byte\| context.new_rvalue_from_int(byte_type, byte as i32)).collect();
	context.new_array_constructor(None, typ, &elements)
	}

	pub fn type_is_pointer(typ: Type<'_>) -> bool {
	typ.get_pointee().is_some()
	}

	impl<'gcc, 'tcx> ConstCodegenMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
	fn const_null(&self, typ: Type<'gcc>) -> RValue<'gcc> {
	if type_is_pointer(typ) { self.context.new_null(typ) } else { self.const_int(typ, 0) }
	}

	fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {
	let local = self.current_func.borrow().expect("func").new_local(None, typ, "undefined");
	if typ.is_struct().is_some() {
	// NOTE: hack to workaround a limitation of the rustc API: see comment on
	// CodegenCx.structs_as_pointer
	let pointer = local.get_address(None);
	self.structs_as_pointer.borrow_mut().insert(pointer);
	pointer
	} else {
	local.to_rvalue()
	}
	}

	fn const_poison(&self, typ: Type<'gcc>) -> RValue<'gcc> {
	// No distinction between undef and poison.
	self.const_undef(typ)
	}

	fn const_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
	self.gcc_int(typ, int)
	}

	fn const_uint(&self, typ: Type<'gcc>, int: u64) -> RValue<'gcc> {
	self.gcc_uint(typ, int)
	}

	fn const_uint_big(&self, typ: Type<'gcc>, num: u128) -> RValue<'gcc> {
	self.gcc_uint_big(typ, num)
	}

	fn const_bool(&self, val: bool) -> RValue<'gcc> {
	self.const_uint(self.type_i1(), val as u64)
	}

	fn const_i16(&self, i: i16) -> RValue<'gcc> {
	self.const_int(self.type_i16(), i as i64)
	}

	fn const_i32(&self, i: i32) -> RValue<'gcc> {
	self.const_int(self.type_i32(), i as i64)
	}

	fn const_i8(&self, i: i8) -> RValue<'gcc> {
	self.const_int(self.type_i8(), i as i64)
	}

	fn const_u32(&self, i: u32) -> RValue<'gcc> {
	self.const_uint(self.type_u32(), i as u64)
	}

	fn const_u64(&self, i: u64) -> RValue<'gcc> {
	self.const_uint(self.type_u64(), i)
	}

	fn const_u128(&self, i: u128) -> RValue<'gcc> {
	self.const_uint_big(self.type_u128(), i)
	}

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

	self.const_uint(self.usize_type, i)
	}

	fn const_u8(&self, i: u8) -> RValue<'gcc> {
	self.const_uint(self.type_u8(), i as u64)
	}

	fn const_real(&self, typ: Type<'gcc>, val: f64) -> RValue<'gcc> {
	self.context.new_rvalue_from_double(typ, val)
	}

	fn const_str(&self, s: &str) -> (RValue<'gcc>, RValue<'gcc>) {
	let str_global = *self
	.const_str_cache
	.borrow_mut()
	.raw_entry_mut()
	.from_key(s)
	.or_insert_with(\|\| (s.to_owned(), self.global_string(s)))
	.1;
	let len = s.len();
	let cs = self.const_ptrcast(
	str_global.get_address(None),
	self.type_ptr_to(self.layout_of(self.tcx.types.str_).gcc_type(self)),
	);
	(cs, self.const_usize(len as u64))
	}

	fn const_struct(&self, values: &[RValue<'gcc>], packed: bool) -> RValue<'gcc> {
	let fields: Vec<_> = values.iter().map(\|value\| value.get_type()).collect();
	// TODO(antoyo): cache the type? It's anonymous, so probably not.
	let typ = self.type_struct(&fields, packed);
	let struct_type = typ.is_struct().expect("struct type");
	self.context.new_struct_constructor(None, struct_type.as_type(), None, values)
	}

	fn const_vector(&self, values: &[RValue<'gcc>]) -> RValue<'gcc> {
	let typ = self.type_vector(values[0].get_type(), values.len() as u64);
	self.context.new_rvalue_from_vector(None, typ, values)
	}

	fn const_to_opt_uint(&self, _v: RValue<'gcc>) -> Option<u64> {
	// TODO(antoyo)
	None
	}

	fn const_to_opt_u128(&self, _v: RValue<'gcc>, _sign_ext: bool) -> Option<u128> {
	// TODO(antoyo)
	None
	}

	fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, ty: Type<'gcc>) -> RValue<'gcc> {
	let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
	match cv {
	Scalar::Int(int) => {
	let data = int.to_bits(layout.size(self));

	// FIXME(antoyo): there's some issues with using the u128 code that follows, so hard-code
	// the paths for floating-point values.
	if ty == self.float_type {
	return self
	.context
	.new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
	}
	if ty == self.double_type {
	return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
	}

	let value = self.const_uint_big(self.type_ix(bitsize), data);
	let bytesize = layout.size(self).bytes();
	if bitsize > 1 && ty.is_integral() && bytesize as u32 == ty.get_size() {
	// NOTE: since the intrinsic _xabort is called with a bitcast, which
	// is non-const, but expects a constant, do a normal cast instead of a bitcast.
	// FIXME(antoyo): fix bitcast to work in constant contexts.
	// TODO(antoyo): perhaps only use bitcast for pointers?
	self.context.new_cast(None, value, ty)
	} else {
	// TODO(bjorn3): assert size is correct
	self.const_bitcast(value, ty)
	}
	}
	Scalar::Ptr(ptr, _size) => {
	let (prov, offset) = ptr.into_parts(); // we know the `offset` is relative
	let alloc_id = prov.alloc_id();
	let base_addr = match self.tcx.global_alloc(alloc_id) {
	GlobalAlloc::Memory(alloc) => {
	let init = const_alloc_to_gcc(self, alloc);
	let alloc = alloc.inner();
	let value = match alloc.mutability {
	Mutability::Mut => self.static_addr_of_mut(init, alloc.align, None),
	_ => self.static_addr_of(init, alloc.align, None),
	};
	if !self.sess().fewer_names() {
	// TODO(antoyo): set value name.
	}
	value
	}
	GlobalAlloc::Function { instance, .. } => self.get_fn_addr(instance),
	GlobalAlloc::VTable(ty, trait_ref) => {
	let alloc = self
	.tcx
	.global_alloc(self.tcx.vtable_allocation((ty, trait_ref)))
	.unwrap_memory();
	let init = const_alloc_to_gcc(self, alloc);
	self.static_addr_of(init, alloc.inner().align, None)
	}
	GlobalAlloc::Static(def_id) => {
	assert!(self.tcx.is_static(def_id));
	self.get_static(def_id).get_address(None)
	}
	};
	let ptr_type = base_addr.get_type();
	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 !matches!(layout.primitive(), Pointer(_)) {
	self.const_bitcast(ptr.dereference(None).to_rvalue(), ty)
	} else {
	self.const_bitcast(ptr, ty)
	}
	}
	}
	}

	fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value {
	const_alloc_to_gcc(self, alloc)
	}

	fn const_ptr_byte_offset(&self, base_addr: Self::Value, offset: abi::Size) -> Self::Value {
	self.context
	.new_array_access(None, base_addr, self.const_usize(offset.bytes()))
	.get_address(None)
	}
	}

	pub trait SignType<'gcc, 'tcx> {
	fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
	fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
	}

	impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
	fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_i8(cx) \|\| self.is_i16(cx) \|\| self.is_i32(cx) \|\| self.is_i64(cx) \|\| self.is_i128(cx)
	}

	fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_u8(cx) \|\| self.is_u16(cx) \|\| self.is_u32(cx) \|\| self.is_u64(cx) \|\| self.is_u128(cx)
	}

	fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
	if self.is_u8(cx) {
	cx.i8_type
	} else if self.is_u16(cx) {
	cx.i16_type
	} else if self.is_u32(cx) {
	cx.i32_type
	} else if self.is_u64(cx) {
	cx.i64_type
	} else if self.is_u128(cx) {
	cx.i128_type
	} else if self.is_uchar(cx) {
	cx.char_type
	} else if self.is_ushort(cx) {
	cx.short_type
	} else if self.is_uint(cx) {
	cx.int_type
	} else if self.is_ulong(cx) {
	cx.long_type
	} else if self.is_ulonglong(cx) {
	cx.longlong_type
	} else {
	*self
	}
	}

	fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
	if self.is_i8(cx) {
	cx.u8_type
	} else if self.is_i16(cx) {
	cx.u16_type
	} else if self.is_i32(cx) {
	cx.u32_type
	} else if self.is_i64(cx) {
	cx.u64_type
	} else if self.is_i128(cx) {
	cx.u128_type
	} else if self.is_char(cx) {
	cx.uchar_type
	} else if self.is_short(cx) {
	cx.ushort_type
	} else if self.is_int(cx) {
	cx.uint_type
	} else if self.is_long(cx) {
	cx.ulong_type
	} else if self.is_longlong(cx) {
	cx.ulonglong_type
	} else {
	*self
	}
	}
	}

	pub trait TypeReflection<'gcc, 'tcx> {
	fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;

	fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
	fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;

	fn is_vector(&self) -> bool;
	}

	impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
	fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.uchar_type
	}

	fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.ushort_type
	}

	fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.uint_type
	}

	fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.ulong_type
	}

	fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.ulonglong_type
	}

	fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.char_type
	}

	fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.short_type
	}

	fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.int_type
	}

	fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.long_type
	}

	fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.longlong_type
	}

	fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.i8_type)
	}

	fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.u8_type)
	}

	fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.i16_type)
	}

	fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.u16_type)
	}

	fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.i32_type)
	}

	fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.u32_type)
	}

	fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.i64_type)
	}

	fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.is_compatible_with(cx.u64_type)
	}

	fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.i128_type.unqualified()
	}

	fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
	self.unqualified() == cx.u128_type.unqualified()
	}

	fn is_vector(&self) -> bool {
	let mut typ = *self;
	loop {
	if typ.dyncast_vector().is_some() {
	return true;
	}

	let old_type = typ;
	typ = typ.unqualified();
	if old_type == typ {
	break;
	}
	}

	false
	}
	}