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1 use std::convert::TryFrom;
2 use std::convert::TryInto;
3
4 use gccjit::LValue;
5 use gccjit::{Block, CType, RValue, Type, ToRValue};
6 use rustc_codegen_ssa::mir::place::PlaceRef;
7 use rustc_codegen_ssa::traits::{
8 BaseTypeMethods,
9 ConstMethods,
10 DerivedTypeMethods,
11 MiscMethods,
12 StaticMethods,
13 };
14 use rustc_middle::mir::Mutability;
15 use rustc_middle::ty::ScalarInt;
16 use rustc_middle::ty::layout::{TyAndLayout, LayoutOf};
17 use rustc_middle::mir::interpret::{Allocation, GlobalAlloc, Scalar};
18 use rustc_span::Symbol;
19 use rustc_target::abi::{self, HasDataLayout, Pointer, Size};
20
21 use crate::consts::const_alloc_to_gcc;
22 use crate::context::CodegenCx;
23 use crate::type_of::LayoutGccExt;
24
25 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
26 pub fn const_bytes(&self, bytes: &[u8]) -> RValue<'gcc> {
27 bytes_in_context(self, bytes)
28 }
29
30 fn const_cstr(&self, symbol: Symbol, _null_terminated: bool) -> LValue<'gcc> {
31 // TODO(antoyo): handle null_terminated.
32 if let Some(&value) = self.const_cstr_cache.borrow().get(&symbol) {
33 return value;
34 }
35
36 let global = self.global_string(&*symbol.as_str());
37
38 self.const_cstr_cache.borrow_mut().insert(symbol, global);
39 global
40 }
41
42 fn global_string(&self, string: &str) -> LValue<'gcc> {
43 // TODO(antoyo): handle non-null-terminated strings.
44 let string = self.context.new_string_literal(&*string);
45 let sym = self.generate_local_symbol_name("str");
46 let global = self.declare_private_global(&sym, self.val_ty(string));
47 global.global_set_initializer_value(string);
48 global
49 // TODO(antoyo): set linkage.
50 }
51
52 pub fn inttoptr(&self, block: Block<'gcc>, value: RValue<'gcc>, dest_ty: Type<'gcc>) -> RValue<'gcc> {
53 let func = block.get_function();
54 let local = func.new_local(None, value.get_type(), "intLocal");
55 block.add_assignment(None, local, value);
56 let value_address = local.get_address(None);
57
58 let ptr = self.context.new_cast(None, value_address, dest_ty.make_pointer());
59 ptr.dereference(None).to_rvalue()
60 }
61
62 pub fn ptrtoint(&self, block: Block<'gcc>, value: RValue<'gcc>, dest_ty: Type<'gcc>) -> RValue<'gcc> {
63 // TODO(antoyo): when libgccjit allow casting from pointer to int, remove this.
64 let func = block.get_function();
65 let local = func.new_local(None, value.get_type(), "ptrLocal");
66 block.add_assignment(None, local, value);
67 let ptr_address = local.get_address(None);
68
69 let ptr = self.context.new_cast(None, ptr_address, dest_ty.make_pointer());
70 ptr.dereference(None).to_rvalue()
71 }
72 }
73
74 pub fn bytes_in_context<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, bytes: &[u8]) -> RValue<'gcc> {
75 let context = &cx.context;
76 let byte_type = context.new_type::<u8>();
77 let typ = context.new_array_type(None, byte_type, bytes.len() as i32);
78 let elements: Vec<_> =
79 bytes.iter()
80 .map(|&byte| context.new_rvalue_from_int(byte_type, byte as i32))
81 .collect();
82 context.new_rvalue_from_array(None, typ, &elements)
83 }
84
85 pub fn type_is_pointer<'gcc>(typ: Type<'gcc>) -> bool {
86 typ.get_pointee().is_some()
87 }
88
89 impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
90 fn const_null(&self, typ: Type<'gcc>) -> RValue<'gcc> {
91 if type_is_pointer(typ) {
92 self.context.new_null(typ)
93 }
94 else {
95 self.const_int(typ, 0)
96 }
97 }
98
99 fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {
100 let local = self.current_func.borrow().expect("func")
101 .new_local(None, typ, "undefined");
102 if typ.is_struct().is_some() {
103 // NOTE: hack to workaround a limitation of the rustc API: see comment on
104 // CodegenCx.structs_as_pointer
105 let pointer = local.get_address(None);
106 self.structs_as_pointer.borrow_mut().insert(pointer);
107 pointer
108 }
109 else {
110 local.to_rvalue()
111 }
112 }
113
114 fn const_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
115 self.context.new_rvalue_from_long(typ, i64::try_from(int).expect("i64::try_from"))
116 }
117
118 fn const_uint(&self, typ: Type<'gcc>, int: u64) -> RValue<'gcc> {
119 self.context.new_rvalue_from_long(typ, u64::try_from(int).expect("u64::try_from") as i64)
120 }
121
122 fn const_uint_big(&self, typ: Type<'gcc>, num: u128) -> RValue<'gcc> {
123 let num64: Result<i64, _> = num.try_into();
124 if let Ok(num) = num64 {
125 // FIXME(antoyo): workaround for a bug where libgccjit is expecting a constant.
126 // The operations >> 64 and | low are making the normal case a non-constant.
127 return self.context.new_rvalue_from_long(typ, num as i64);
128 }
129
130 if num >> 64 != 0 {
131 // FIXME(antoyo): use a new function new_rvalue_from_unsigned_long()?
132 let low = self.context.new_rvalue_from_long(self.u64_type, num as u64 as i64);
133 let high = self.context.new_rvalue_from_long(typ, (num >> 64) as u64 as i64);
134
135 let sixty_four = self.context.new_rvalue_from_long(typ, 64);
136 (high << sixty_four) | self.context.new_cast(None, low, typ)
137 }
138 else if typ.is_i128(self) {
139 let num = self.context.new_rvalue_from_long(self.u64_type, num as u64 as i64);
140 self.context.new_cast(None, num, typ)
141 }
142 else {
143 self.context.new_rvalue_from_long(typ, num as u64 as i64)
144 }
145 }
146
147 fn const_bool(&self, val: bool) -> RValue<'gcc> {
148 self.const_uint(self.type_i1(), val as u64)
149 }
150
151 fn const_i32(&self, i: i32) -> RValue<'gcc> {
152 self.const_int(self.type_i32(), i as i64)
153 }
154
155 fn const_u32(&self, i: u32) -> RValue<'gcc> {
156 self.const_uint(self.type_u32(), i as u64)
157 }
158
159 fn const_u64(&self, i: u64) -> RValue<'gcc> {
160 self.const_uint(self.type_u64(), i)
161 }
162
163 fn const_usize(&self, i: u64) -> RValue<'gcc> {
164 let bit_size = self.data_layout().pointer_size.bits();
165 if bit_size < 64 {
166 // make sure it doesn't overflow
167 assert!(i < (1 << bit_size));
168 }
169
170 self.const_uint(self.usize_type, i)
171 }
172
173 fn const_u8(&self, _i: u8) -> RValue<'gcc> {
174 unimplemented!();
175 }
176
177 fn const_real(&self, _t: Type<'gcc>, _val: f64) -> RValue<'gcc> {
178 unimplemented!();
179 }
180
181 fn const_str(&self, s: Symbol) -> (RValue<'gcc>, RValue<'gcc>) {
182 let len = s.as_str().len();
183 let cs = self.const_ptrcast(self.const_cstr(s, false).get_address(None),
184 self.type_ptr_to(self.layout_of(self.tcx.types.str_).gcc_type(self, true)),
185 );
186 (cs, self.const_usize(len as u64))
187 }
188
189 fn const_struct(&self, values: &[RValue<'gcc>], packed: bool) -> RValue<'gcc> {
190 let fields: Vec<_> = values.iter()
191 .map(|value| value.get_type())
192 .collect();
193 // TODO(antoyo): cache the type? It's anonymous, so probably not.
194 let typ = self.type_struct(&fields, packed);
195 let struct_type = typ.is_struct().expect("struct type");
196 self.context.new_rvalue_from_struct(None, struct_type, values)
197 }
198
199 fn const_to_opt_uint(&self, _v: RValue<'gcc>) -> Option<u64> {
200 // TODO(antoyo)
201 None
202 }
203
204 fn const_to_opt_u128(&self, _v: RValue<'gcc>, _sign_ext: bool) -> Option<u128> {
205 // TODO(antoyo)
206 None
207 }
208
209 fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, ty: Type<'gcc>) -> RValue<'gcc> {
210 let bitsize = if layout.is_bool() { 1 } else { layout.value.size(self).bits() };
211 match cv {
212 Scalar::Int(ScalarInt::ZST) => {
213 assert_eq!(0, layout.value.size(self).bytes());
214 self.const_undef(self.type_ix(0))
215 }
216 Scalar::Int(int) => {
217 let data = int.assert_bits(layout.value.size(self));
218
219 // FIXME(antoyo): there's some issues with using the u128 code that follows, so hard-code
220 // the paths for floating-point values.
221 if ty == self.float_type {
222 return self.context.new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
223 }
224 else if ty == self.double_type {
225 return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
226 }
227
228 let value = self.const_uint_big(self.type_ix(bitsize), data);
229 if layout.value == Pointer {
230 self.inttoptr(self.current_block.borrow().expect("block"), value, ty)
231 } else {
232 self.const_bitcast(value, ty)
233 }
234 }
235 Scalar::Ptr(ptr, _size) => {
236 let (alloc_id, offset) = ptr.into_parts();
237 let base_addr =
238 match self.tcx.global_alloc(alloc_id) {
239 GlobalAlloc::Memory(alloc) => {
240 let init = const_alloc_to_gcc(self, alloc);
241 let value =
242 match alloc.mutability {
243 Mutability::Mut => self.static_addr_of_mut(init, alloc.align, None),
244 _ => self.static_addr_of(init, alloc.align, None),
245 };
246 if !self.sess().fewer_names() {
247 // TODO(antoyo): set value name.
248 }
249 value
250 },
251 GlobalAlloc::Function(fn_instance) => {
252 self.get_fn_addr(fn_instance)
253 },
254 GlobalAlloc::Static(def_id) => {
255 assert!(self.tcx.is_static(def_id));
256 self.get_static(def_id).get_address(None)
257 },
258 };
259 let ptr_type = base_addr.get_type();
260 let base_addr = self.const_bitcast(base_addr, self.usize_type);
261 let offset = self.context.new_rvalue_from_long(self.usize_type, offset.bytes() as i64);
262 let ptr = self.const_bitcast(base_addr + offset, ptr_type);
263 if layout.value != Pointer {
264 self.const_bitcast(ptr.dereference(None).to_rvalue(), ty)
265 }
266 else {
267 self.const_bitcast(ptr, ty)
268 }
269 }
270 }
271 }
272
273 fn const_data_from_alloc(&self, alloc: &Allocation) -> Self::Value {
274 const_alloc_to_gcc(self, alloc)
275 }
276
277 fn from_const_alloc(&self, layout: TyAndLayout<'tcx>, alloc: &Allocation, offset: Size) -> PlaceRef<'tcx, RValue<'gcc>> {
278 assert_eq!(alloc.align, layout.align.abi);
279 let ty = self.type_ptr_to(layout.gcc_type(self, true));
280 let value =
281 if layout.size == Size::ZERO {
282 let value = self.const_usize(alloc.align.bytes());
283 self.context.new_cast(None, value, ty)
284 }
285 else {
286 let init = const_alloc_to_gcc(self, alloc);
287 let base_addr = self.static_addr_of(init, alloc.align, None);
288
289 let array = self.const_bitcast(base_addr, self.type_i8p());
290 let value = self.context.new_array_access(None, array, self.const_usize(offset.bytes())).get_address(None);
291 self.const_bitcast(value, ty)
292 };
293 PlaceRef::new_sized(value, layout)
294 }
295
296 fn const_ptrcast(&self, val: RValue<'gcc>, ty: Type<'gcc>) -> RValue<'gcc> {
297 self.context.new_cast(None, val, ty)
298 }
299 }
300
301 pub trait SignType<'gcc, 'tcx> {
302 fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
303 fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
304 fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
305 fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
306 }
307
308 impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
309 fn is_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
310 self.is_i8(cx) || self.is_i16(cx) || self.is_i32(cx) || self.is_i64(cx) || self.is_i128(cx)
311 }
312
313 fn is_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
314 self.is_u8(cx) || self.is_u16(cx) || self.is_u32(cx) || self.is_u64(cx) || self.is_u128(cx)
315 }
316
317 fn to_signed(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
318 if self.is_u8(cx) {
319 cx.i8_type
320 }
321 else if self.is_u16(cx) {
322 cx.i16_type
323 }
324 else if self.is_u32(cx) {
325 cx.i32_type
326 }
327 else if self.is_u64(cx) {
328 cx.i64_type
329 }
330 else if self.is_u128(cx) {
331 cx.i128_type
332 }
333 else {
334 self.clone()
335 }
336 }
337
338 fn to_unsigned(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
339 if self.is_i8(cx) {
340 cx.u8_type
341 }
342 else if self.is_i16(cx) {
343 cx.u16_type
344 }
345 else if self.is_i32(cx) {
346 cx.u32_type
347 }
348 else if self.is_i64(cx) {
349 cx.u64_type
350 }
351 else if self.is_i128(cx) {
352 cx.u128_type
353 }
354 else {
355 self.clone()
356 }
357 }
358 }
359
360 pub trait TypeReflection<'gcc, 'tcx> {
361 fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
362 fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
363 fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
364 fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
365 fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
366
367 fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
368 fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
369 fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
370 fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
371 fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
372 fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
373 fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
374 fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
375 fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
376 fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
377
378 fn is_f32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
379 fn is_f64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool;
380 }
381
382 impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
383 fn is_uchar(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
384 self.unqualified() == cx.u8_type
385 }
386
387 fn is_ushort(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
388 self.unqualified() == cx.u16_type
389 }
390
391 fn is_uint(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
392 self.unqualified() == cx.uint_type
393 }
394
395 fn is_ulong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
396 self.unqualified() == cx.ulong_type
397 }
398
399 fn is_ulonglong(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
400 self.unqualified() == cx.ulonglong_type
401 }
402
403 fn is_i8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
404 self.unqualified() == cx.i8_type
405 }
406
407 fn is_u8(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
408 self.unqualified() == cx.u8_type
409 }
410
411 fn is_i16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
412 self.unqualified() == cx.i16_type
413 }
414
415 fn is_u16(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
416 self.unqualified() == cx.u16_type
417 }
418
419 fn is_i32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
420 self.unqualified() == cx.i32_type
421 }
422
423 fn is_u32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
424 self.unqualified() == cx.u32_type
425 }
426
427 fn is_i64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
428 self.unqualified() == cx.i64_type
429 }
430
431 fn is_u64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
432 self.unqualified() == cx.u64_type
433 }
434
435 fn is_i128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
436 self.unqualified() == cx.context.new_c_type(CType::Int128t)
437 }
438
439 fn is_u128(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
440 self.unqualified() == cx.context.new_c_type(CType::UInt128t)
441 }
442
443 fn is_f32(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
444 self.unqualified() == cx.context.new_type::<f32>()
445 }
446
447 fn is_f64(&self, cx: &CodegenCx<'gcc, 'tcx>) -> bool {
448 self.unqualified() == cx.context.new_type::<f64>()
449 }
450 }