compiler/rustc_codegen_gcc/src/common.rs

   1 use gccjit::LValue;
   2 use gccjit::{RValue, Type, ToRValue};
   3 use rustc_codegen_ssa::mir::place::PlaceRef;
   4 use rustc_codegen_ssa::traits::{
   5     BaseTypeMethods,
   6     ConstMethods,
   7     DerivedTypeMethods,
   8     MiscMethods,
   9     StaticMethods,
  10 };
  11 use rustc_middle::mir::Mutability;
  12 use rustc_middle::ty::ScalarInt;
  13 use rustc_middle::ty::layout::{TyAndLayout, LayoutOf};
  14 use rustc_middle::mir::interpret::{ConstAllocation, GlobalAlloc, Scalar};
  15 use rustc_span::Symbol;
  16 use rustc_target::abi::{self, HasDataLayout, Pointer, Size};
  17
  18 use crate::consts::const_alloc_to_gcc;
  19 use crate::context::CodegenCx;
  20 use crate::type_of::LayoutGccExt;
  21
  22 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
  23     pub fn const_bytes(&self, bytes: &[u8]) -> RValue<'gcc> {
  24         bytes_in_context(self, bytes)
  25     }
  26
  27     fn global_string(&self, string: &str) -> LValue<'gcc> {
  28         // TODO(antoyo): handle non-null-terminated strings.
  29         let string = self.context.new_string_literal(&*string);
  30         let sym = self.generate_local_symbol_name("str");
  31         let global = self.declare_private_global(&sym, self.val_ty(string));
  32         global.global_set_initializer_rvalue(string);
  33         global
  34         // TODO(antoyo): set linkage.
  35     }
  36 }
  37
  38 pub fn bytes_in_context<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, bytes: &[u8]) -> RValue<'gcc> {
  39     let context = &cx.context;
  40     let byte_type = context.new_type::<u8>();
  41     let typ = context.new_array_type(None, byte_type, bytes.len() as i32);
  42     let elements: Vec<_> =
  43         bytes.iter()
  44         .map(|&byte| context.new_rvalue_from_int(byte_type, byte as i32))
  45         .collect();
  46     context.new_array_constructor(None, typ, &elements)
  47 }
  48
  49 pub fn type_is_pointer<'gcc>(typ: Type<'gcc>) -> bool {
  50     typ.get_pointee().is_some()
  51 }
  52
  53 impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
  54     fn const_null(&self, typ: Type<'gcc>) -> RValue<'gcc> {
  55         if type_is_pointer(typ) {
  56             self.context.new_null(typ)
  57         }
  58         else {
  59             self.const_int(typ, 0)
  60         }
  61     }
  62
  63     fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {
  64         let local = self.current_func.borrow().expect("func")
  65             .new_local(None, typ, "undefined");
  66         if typ.is_struct().is_some() {
  67             // NOTE: hack to workaround a limitation of the rustc API: see comment on
  68             // CodegenCx.structs_as_pointer
  69             let pointer = local.get_address(None);
  70             self.structs_as_pointer.borrow_mut().insert(pointer);
  71             pointer
  72         }
  73         else {
  74             local.to_rvalue()
  75         }
  76     }
  77
  78     fn const_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
  79         self.gcc_int(typ, int)
  80     }
  81
  82     fn const_uint(&self, typ: Type<'gcc>, int: u64) -> RValue<'gcc> {
  83         self.gcc_uint(typ, int)
  84     }
  85
  86     fn const_uint_big(&self, typ: Type<'gcc>, num: u128) -> RValue<'gcc> {
  87         self.gcc_uint_big(typ, num)
  88     }
  89
  90     fn const_bool(&self, val: bool) -> RValue<'gcc> {
  91         self.const_uint(self.type_i1(), val as u64)
  92     }
  93
  94     fn const_i16(&self, i: i16) -> RValue<'gcc> {
  95         self.const_int(self.type_i16(), i as i64)
  96     }
  97
  98     fn const_i32(&self, i: i32) -> RValue<'gcc> {
  99         self.const_int(self.type_i32(), i as i64)
 100     }
 101
 102     fn const_u32(&self, i: u32) -> RValue<'gcc> {
 103         self.const_uint(self.type_u32(), i as u64)
 104     }
 105
 106     fn const_u64(&self, i: u64) -> RValue<'gcc> {
 107         self.const_uint(self.type_u64(), i)
 108     }
 109
 110     fn const_usize(&self, i: u64) -> RValue<'gcc> {
 111         let bit_size = self.data_layout().pointer_size.bits();
 112         if bit_size < 64 {
 113             // make sure it doesn't overflow
 114             assert!(i < (1 << bit_size));
 115         }
 116
 117         self.const_uint(self.usize_type, i)
 118     }
 119
 120     fn const_u8(&self, _i: u8) -> RValue<'gcc> {
 121         unimplemented!();
 122     }
 123
 124     fn const_real(&self, typ: Type<'gcc>, val: f64) -> RValue<'gcc> {
 125         self.context.new_rvalue_from_double(typ, val)
 126     }
 127
 128     fn const_str(&self, s: Symbol) -> (RValue<'gcc>, RValue<'gcc>) {
 129         let s_str = s.as_str();
 130         let str_global = *self.const_str_cache.borrow_mut().entry(s).or_insert_with(|| {
 131             self.global_string(s_str)
 132         });
 133         let len = s_str.len();
 134         let cs = self.const_ptrcast(str_global.get_address(None),
 135             self.type_ptr_to(self.layout_of(self.tcx.types.str_).gcc_type(self, true)),
 136         );
 137         (cs, self.const_usize(len as u64))
 138     }
 139
 140     fn const_struct(&self, values: &[RValue<'gcc>], packed: bool) -> RValue<'gcc> {
 141         let fields: Vec<_> = values.iter()
 142             .map(|value| value.get_type())
 143             .collect();
 144         // TODO(antoyo): cache the type? It's anonymous, so probably not.
 145         let typ = self.type_struct(&fields, packed);
 146         let struct_type = typ.is_struct().expect("struct type");
 147         self.context.new_struct_constructor(None, struct_type.as_type(), None, values)
 148     }
 149
 150     fn const_to_opt_uint(&self, _v: RValue<'gcc>) -> Option<u64> {
 151         // TODO(antoyo)
 152         None
 153     }
 154
 155     fn const_to_opt_u128(&self, _v: RValue<'gcc>, _sign_ext: bool) -> Option<u128> {
 156         // TODO(antoyo)
 157         None
 158     }
 159
 160     fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, ty: Type<'gcc>) -> RValue<'gcc> {
 161         let bitsize = if layout.is_bool() { 1 } else { layout.size(self).bits() };
 162         match cv {
 163             Scalar::Int(ScalarInt::ZST) => {
 164                 assert_eq!(0, layout.size(self).bytes());
 165                 self.const_undef(self.type_ix(0))
 166             }
 167             Scalar::Int(int) => {
 168                 let data = int.assert_bits(layout.size(self));
 169
 170                 // FIXME(antoyo): there's some issues with using the u128 code that follows, so hard-code
 171                 // the paths for floating-point values.
 172                 if ty == self.float_type {
 173                     return self.context.new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
 174                 }
 175                 else if ty == self.double_type {
 176                     return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
 177                 }
 178
 179                 let value = self.const_uint_big(self.type_ix(bitsize), data);
 180                 // TODO(bjorn3): assert size is correct
 181                 self.const_bitcast(value, ty)
 182             }
 183             Scalar::Ptr(ptr, _size) => {
 184                 let (alloc_id, offset) = ptr.into_parts();
 185                 let base_addr =
 186                     match self.tcx.global_alloc(alloc_id) {
 187                         GlobalAlloc::Memory(alloc) => {
 188                             let init = const_alloc_to_gcc(self, alloc);
 189                             let alloc = alloc.inner();
 190                             let value =
 191                                 match alloc.mutability {
 192                                     Mutability::Mut => self.static_addr_of_mut(init, alloc.align, None),
 193                                     _ => self.static_addr_of(init, alloc.align, None),
 194                                 };
 195                             if !self.sess().fewer_names() {
 196                                 // TODO(antoyo): set value name.
 197                             }
 198                             value
 199                         },
 200                         GlobalAlloc::Function(fn_instance) => {
 201                             self.get_fn_addr(fn_instance)
 202                         },
 203                         GlobalAlloc::Static(def_id) => {
 204                             assert!(self.tcx.is_static(def_id));
 205                             self.get_static(def_id).get_address(None)
 206                         },
 207                     };
 208                 let ptr_type = base_addr.get_type();
 209                 let base_addr = self.const_bitcast(base_addr, self.usize_type);
 210                 let offset = self.context.new_rvalue_from_long(self.usize_type, offset.bytes() as i64);
 211                 let ptr = self.const_bitcast(base_addr + offset, ptr_type);
 212                 if layout.primitive() != Pointer {
 213                     self.const_bitcast(ptr.dereference(None).to_rvalue(), ty)
 214                 }
 215                 else {
 216                     self.const_bitcast(ptr, ty)
 217                 }
 218             }
 219         }
 220     }
 221
 222     fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value {
 223         const_alloc_to_gcc(self, alloc)
 224     }
 225
 226     fn from_const_alloc(&self, layout: TyAndLayout<'tcx>, alloc: ConstAllocation<'tcx>, offset: Size) -> PlaceRef<'tcx, RValue<'gcc>> {
 227         assert_eq!(alloc.inner().align, layout.align.abi);
 228         let ty = self.type_ptr_to(layout.gcc_type(self, true));
 229         let value =
 230             if layout.size == Size::ZERO {
 231                 let value = self.const_usize(alloc.inner().align.bytes());
 232                 self.context.new_cast(None, value, ty)
 233             }
 234             else {
 235                 let init = const_alloc_to_gcc(self, alloc);
 236                 let base_addr = self.static_addr_of(init, alloc.inner().align, None);
 237
 238                 let array = self.const_bitcast(base_addr, self.type_i8p());
 239                 let value = self.context.new_array_access(None, array, self.const_usize(offset.bytes())).get_address(None);
 240                 self.const_bitcast(value, ty)
 241             };
 242         PlaceRef::new_sized(value, layout)
 243     }
 244
 245     fn const_ptrcast(&self, val: RValue<'gcc>, ty: Type<'gcc>) -> RValue<'gcc> {
 246         self.context.new_cast(None, val, ty)
 247     }
 248 }
 249
 250 pub trait SignType<'gcc, 'tcx> {
 251     fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 252     fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 253     fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
 254     fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
 255 }
 256
 257 impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
 258     fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 259         self.is_i8(cx) || self.is_i16(cx) || self.is_i32(cx) || self.is_i64(cx) || self.is_i128(cx)
 260     }
 261
 262     fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 263         self.is_u8(cx) || self.is_u16(cx) || self.is_u32(cx) || self.is_u64(cx) || self.is_u128(cx)
 264     }
 265
 266     fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
 267         if self.is_u8(cx) {
 268             cx.i8_type
 269         }
 270         else if self.is_u16(cx) {
 271             cx.i16_type
 272         }
 273         else if self.is_u32(cx) {
 274             cx.i32_type
 275         }
 276         else if self.is_u64(cx) {
 277             cx.i64_type
 278         }
 279         else if self.is_u128(cx) {
 280             cx.i128_type
 281         }
 282         else if self.is_uchar(cx) {
 283             cx.char_type
 284         }
 285         else if self.is_ushort(cx) {
 286             cx.short_type
 287         }
 288         else if self.is_uint(cx) {
 289             cx.int_type
 290         }
 291         else if self.is_ulong(cx) {
 292             cx.long_type
 293         }
 294         else if self.is_ulonglong(cx) {
 295             cx.longlong_type
 296         }
 297         else {
 298             self.clone()
 299         }
 300     }
 301
 302     fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
 303         if self.is_i8(cx) {
 304             cx.u8_type
 305         }
 306         else if self.is_i16(cx) {
 307             cx.u16_type
 308         }
 309         else if self.is_i32(cx) {
 310             cx.u32_type
 311         }
 312         else if self.is_i64(cx) {
 313             cx.u64_type
 314         }
 315         else if self.is_i128(cx) {
 316             cx.u128_type
 317         }
 318         else if self.is_char(cx) {
 319             cx.uchar_type
 320         }
 321         else if self.is_short(cx) {
 322             cx.ushort_type
 323         }
 324         else if self.is_int(cx) {
 325             cx.uint_type
 326         }
 327         else if self.is_long(cx) {
 328             cx.ulong_type
 329         }
 330         else if self.is_longlong(cx) {
 331             cx.ulonglong_type
 332         }
 333         else {
 334             self.clone()
 335         }
 336     }
 337 }
 338
 339 pub trait TypeReflection<'gcc, 'tcx>  {
 340     fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 341     fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 342     fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 343     fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 344     fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 345     fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 346     fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 347     fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 348     fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 349     fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 350
 351     fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 352     fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 353     fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 354     fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 355     fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 356     fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 357     fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 358     fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 359     fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 360     fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 361
 362     fn is_f32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 363     fn is_f64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
 364
 365     fn is_vector(&self) -> bool;
 366 }
 367
 368 impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
 369     fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 370         self.unqualified() == cx.uchar_type
 371     }
 372
 373     fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 374         self.unqualified() == cx.ushort_type
 375     }
 376
 377     fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 378         self.unqualified() == cx.uint_type
 379     }
 380
 381     fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 382         self.unqualified() == cx.ulong_type
 383     }
 384
 385     fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 386         self.unqualified() == cx.ulonglong_type
 387     }
 388
 389     fn is_char(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 390         self.unqualified() == cx.char_type
 391     }
 392
 393     fn is_short(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 394         self.unqualified() == cx.short_type
 395     }
 396
 397     fn is_int(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 398         self.unqualified() == cx.int_type
 399     }
 400
 401     fn is_long(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 402         self.unqualified() == cx.long_type
 403     }
 404
 405     fn is_longlong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 406         self.unqualified() == cx.longlong_type
 407     }
 408
 409     fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 410         self.unqualified() == cx.i8_type
 411     }
 412
 413     fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 414         self.unqualified() == cx.u8_type
 415     }
 416
 417     fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 418         self.unqualified() == cx.i16_type
 419     }
 420
 421     fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 422         self.unqualified() == cx.u16_type
 423     }
 424
 425     fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 426         self.unqualified() == cx.i32_type
 427     }
 428
 429     fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 430         self.unqualified() == cx.u32_type
 431     }
 432
 433     fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 434         self.unqualified() == cx.i64_type
 435     }
 436
 437     fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 438         self.unqualified() == cx.u64_type
 439     }
 440
 441     fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 442         self.unqualified() == cx.i128_type.unqualified()
 443     }
 444
 445     fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 446         self.unqualified() == cx.u128_type.unqualified()
 447     }
 448
 449     fn is_f32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 450         self.unqualified() == cx.context.new_type::<f32>()
 451     }
 452
 453     fn is_f64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
 454         self.unqualified() == cx.context.new_type::<f64>()
 455     }
 456
 457     fn is_vector(&self) -> bool {
 458         let mut typ = self.clone();
 459         loop {
 460             if typ.dyncast_vector().is_some() {
 461                 return true;
 462             }
 463
 464             let old_type = typ;
 465             typ = typ.unqualified();
 466             if old_type == typ {
 467                 break;
 468             }
 469         }
 470
 471         false
 472     }
 473 }