summaryrefslogtreecommitdiffstats
path: root/compiler/rustc_codegen_gcc/src/context.rs
blob: 661681bdb50f2f1094b0f18736ad43846110cc64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
use std::cell::{Cell, RefCell};

use gccjit::{Block, CType, Context, Function, FunctionPtrType, FunctionType, LValue, RValue, Type};
use rustc_codegen_ssa::base::wants_msvc_seh;
use rustc_codegen_ssa::traits::{
    BackendTypes,
    BaseTypeMethods,
    MiscMethods,
};
use rustc_data_structures::base_n;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_middle::span_bug;
use rustc_middle::mir::mono::CodegenUnit;
use rustc_middle::ty::{self, Instance, ParamEnv, PolyExistentialTraitRef, Ty, TyCtxt};
use rustc_middle::ty::layout::{FnAbiError, FnAbiOf, FnAbiOfHelpers, FnAbiRequest, HasParamEnv, HasTyCtxt, LayoutError, TyAndLayout, LayoutOfHelpers};
use rustc_session::Session;
use rustc_span::{Span, source_map::respan};
use rustc_target::abi::{call::FnAbi, HasDataLayout, PointeeInfo, Size, TargetDataLayout, VariantIdx};
use rustc_target::spec::{HasTargetSpec, Target, TlsModel};

use crate::callee::get_fn;

#[derive(Clone)]
pub struct FuncSig<'gcc> {
    pub params: Vec<Type<'gcc>>,
    pub return_type: Type<'gcc>,
}

pub struct CodegenCx<'gcc, 'tcx> {
    pub check_overflow: bool,
    pub codegen_unit: &'tcx CodegenUnit<'tcx>,
    pub context: &'gcc Context<'gcc>,

    // TODO(bjorn3): Can this field be removed?
    pub current_func: RefCell<Option<Function<'gcc>>>,
    pub normal_function_addresses: RefCell<FxHashSet<RValue<'gcc>>>,
    pub function_address_names: RefCell<FxHashMap<RValue<'gcc>, String>>,

    pub functions: RefCell<FxHashMap<String, Function<'gcc>>>,
    pub intrinsics: RefCell<FxHashMap<String, Function<'gcc>>>,

    pub tls_model: gccjit::TlsModel,

    pub bool_type: Type<'gcc>,
    pub i8_type: Type<'gcc>,
    pub i16_type: Type<'gcc>,
    pub i32_type: Type<'gcc>,
    pub i64_type: Type<'gcc>,
    pub i128_type: Type<'gcc>,
    pub isize_type: Type<'gcc>,

    pub u8_type: Type<'gcc>,
    pub u16_type: Type<'gcc>,
    pub u32_type: Type<'gcc>,
    pub u64_type: Type<'gcc>,
    pub u128_type: Type<'gcc>,
    pub usize_type: Type<'gcc>,

    pub char_type: Type<'gcc>,
    pub uchar_type: Type<'gcc>,
    pub short_type: Type<'gcc>,
    pub ushort_type: Type<'gcc>,
    pub int_type: Type<'gcc>,
    pub uint_type: Type<'gcc>,
    pub long_type: Type<'gcc>,
    pub ulong_type: Type<'gcc>,
    pub longlong_type: Type<'gcc>,
    pub ulonglong_type: Type<'gcc>,
    pub sizet_type: Type<'gcc>,

    pub supports_128bit_integers: bool,

    pub float_type: Type<'gcc>,
    pub double_type: Type<'gcc>,

    pub linkage: Cell<FunctionType>,
    pub scalar_types: RefCell<FxHashMap<Ty<'tcx>, Type<'gcc>>>,
    pub types: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), Type<'gcc>>>,
    pub tcx: TyCtxt<'tcx>,

    pub struct_types: RefCell<FxHashMap<Vec<Type<'gcc>>, Type<'gcc>>>,

    /// Cache instances of monomorphic and polymorphic items
    pub instances: RefCell<FxHashMap<Instance<'tcx>, LValue<'gcc>>>,
    /// Cache function instances of monomorphic and polymorphic items
    pub function_instances: RefCell<FxHashMap<Instance<'tcx>, Function<'gcc>>>,
    /// Cache generated vtables
    pub vtables: RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), RValue<'gcc>>>,

    // TODO(antoyo): improve the SSA API to not require those.
    /// Mapping from function pointer type to indexes of on stack parameters.
    pub on_stack_params: RefCell<FxHashMap<FunctionPtrType<'gcc>, FxHashSet<usize>>>,
    /// Mapping from function to indexes of on stack parameters.
    pub on_stack_function_params: RefCell<FxHashMap<Function<'gcc>, FxHashSet<usize>>>,

    /// Cache of emitted const globals (value -> global)
    pub const_globals: RefCell<FxHashMap<RValue<'gcc>, RValue<'gcc>>>,

    /// Map from the address of a global variable (rvalue) to the global variable itself (lvalue).
    /// TODO(antoyo): remove when the rustc API is fixed.
    pub global_lvalues: RefCell<FxHashMap<RValue<'gcc>, LValue<'gcc>>>,

    /// Cache of constant strings,
    pub const_str_cache: RefCell<FxHashMap<String, LValue<'gcc>>>,

    /// Cache of globals.
    pub globals: RefCell<FxHashMap<String, RValue<'gcc>>>,

    /// A counter that is used for generating local symbol names
    local_gen_sym_counter: Cell<usize>,

    eh_personality: Cell<Option<RValue<'gcc>>>,
    pub rust_try_fn: Cell<Option<(Type<'gcc>, Function<'gcc>)>>,

    pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,

    /// NOTE: a hack is used because the rustc API is not suitable to libgccjit and as such,
    /// `const_undef()` returns struct as pointer so that they can later be assigned a value.
    /// As such, this set remembers which of these pointers were returned by this function so that
    /// they can be dereferenced later.
    /// FIXME(antoyo): fix the rustc API to avoid having this hack.
    pub structs_as_pointer: RefCell<FxHashSet<RValue<'gcc>>>,

    pub cleanup_blocks: RefCell<FxHashSet<Block<'gcc>>>,
}

impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
    pub fn new(context: &'gcc Context<'gcc>, codegen_unit: &'tcx CodegenUnit<'tcx>, tcx: TyCtxt<'tcx>, supports_128bit_integers: bool) -> Self {
        let check_overflow = tcx.sess.overflow_checks();

        let i8_type = context.new_c_type(CType::Int8t);
        let i16_type = context.new_c_type(CType::Int16t);
        let i32_type = context.new_c_type(CType::Int32t);
        let i64_type = context.new_c_type(CType::Int64t);
        let u8_type = context.new_c_type(CType::UInt8t);
        let u16_type = context.new_c_type(CType::UInt16t);
        let u32_type = context.new_c_type(CType::UInt32t);
        let u64_type = context.new_c_type(CType::UInt64t);

        let (i128_type, u128_type) =
            if supports_128bit_integers {
                let i128_type = context.new_c_type(CType::Int128t).get_aligned(8); // TODO(antoyo): should the alignment be hard-coded?;
                let u128_type = context.new_c_type(CType::UInt128t).get_aligned(8); // TODO(antoyo): should the alignment be hard-coded?;
                (i128_type, u128_type)
            }
            else {
                let i128_type = context.new_array_type(None, i64_type, 2);
                let u128_type = context.new_array_type(None, u64_type, 2);
                (i128_type, u128_type)
            };

        let tls_model = to_gcc_tls_mode(tcx.sess.tls_model());

        let float_type = context.new_type::<f32>();
        let double_type = context.new_type::<f64>();

        let char_type = context.new_c_type(CType::Char);
        let uchar_type = context.new_c_type(CType::UChar);
        let short_type = context.new_c_type(CType::Short);
        let ushort_type = context.new_c_type(CType::UShort);
        let int_type = context.new_c_type(CType::Int);
        let uint_type = context.new_c_type(CType::UInt);
        let long_type = context.new_c_type(CType::Long);
        let ulong_type = context.new_c_type(CType::ULong);
        let longlong_type = context.new_c_type(CType::LongLong);
        let ulonglong_type = context.new_c_type(CType::ULongLong);
        let sizet_type = context.new_c_type(CType::SizeT);

        let isize_type = context.new_c_type(CType::LongLong);
        let usize_type = context.new_c_type(CType::ULongLong);
        let bool_type = context.new_type::<bool>();

        // TODO(antoyo): only have those assertions on x86_64.
        assert_eq!(isize_type.get_size(), i64_type.get_size());
        assert_eq!(usize_type.get_size(), u64_type.get_size());

        let mut functions = FxHashMap::default();
        let builtins = [
            "__builtin_unreachable", "abort", "__builtin_expect", "__builtin_add_overflow", "__builtin_mul_overflow",
            "__builtin_saddll_overflow", /*"__builtin_sadd_overflow",*/ "__builtin_smulll_overflow", /*"__builtin_smul_overflow",*/
            "__builtin_ssubll_overflow", /*"__builtin_ssub_overflow",*/ "__builtin_sub_overflow", "__builtin_uaddll_overflow",
            "__builtin_uadd_overflow", "__builtin_umulll_overflow", "__builtin_umul_overflow", "__builtin_usubll_overflow",
            "__builtin_usub_overflow", "sqrtf", "sqrt", "__builtin_powif", "__builtin_powi", "sinf", "sin", "cosf", "cos",
            "powf", "pow", "expf", "exp", "exp2f", "exp2", "logf", "log", "log10f", "log10", "log2f", "log2", "fmaf",
            "fma", "fabsf", "fabs", "fminf", "fmin", "fmaxf", "fmax", "copysignf", "copysign", "floorf", "floor", "ceilf",
            "ceil", "truncf", "trunc", "rintf", "rint", "nearbyintf", "nearbyint", "roundf", "round",
            "__builtin_expect_with_probability",
        ];

        for builtin in builtins.iter() {
            functions.insert(builtin.to_string(), context.get_builtin_function(builtin));
        }

        Self {
            check_overflow,
            codegen_unit,
            context,
            current_func: RefCell::new(None),
            normal_function_addresses: Default::default(),
            function_address_names: Default::default(),
            functions: RefCell::new(functions),
            intrinsics: RefCell::new(FxHashMap::default()),

            tls_model,

            bool_type,
            i8_type,
            i16_type,
            i32_type,
            i64_type,
            i128_type,
            isize_type,
            usize_type,
            u8_type,
            u16_type,
            u32_type,
            u64_type,
            u128_type,
            char_type,
            uchar_type,
            short_type,
            ushort_type,
            int_type,
            uint_type,
            long_type,
            ulong_type,
            longlong_type,
            ulonglong_type,
            sizet_type,

            supports_128bit_integers,

            float_type,
            double_type,

            linkage: Cell::new(FunctionType::Internal),
            instances: Default::default(),
            function_instances: Default::default(),
            on_stack_params: Default::default(),
            on_stack_function_params: Default::default(),
            vtables: Default::default(),
            const_globals: Default::default(),
            global_lvalues: Default::default(),
            const_str_cache: Default::default(),
            globals: Default::default(),
            scalar_types: Default::default(),
            types: Default::default(),
            tcx,
            struct_types: Default::default(),
            local_gen_sym_counter: Cell::new(0),
            eh_personality: Cell::new(None),
            rust_try_fn: Cell::new(None),
            pointee_infos: Default::default(),
            structs_as_pointer: Default::default(),
            cleanup_blocks: Default::default(),
        }
    }

    pub fn rvalue_as_function(&self, value: RValue<'gcc>) -> Function<'gcc> {
        let function: Function<'gcc> = unsafe { std::mem::transmute(value) };
        debug_assert!(self.functions.borrow().values().any(|value| *value == function),
            "{:?} ({:?}) is not a function", value, value.get_type());
        function
    }

    pub fn is_native_int_type(&self, typ: Type<'gcc>) -> bool {
        let types = [
            self.u8_type,
            self.u16_type,
            self.u32_type,
            self.u64_type,
            self.i8_type,
            self.i16_type,
            self.i32_type,
            self.i64_type,
        ];

        for native_type in types {
            if native_type.is_compatible_with(typ) {
                return true;
            }
        }

        self.supports_128bit_integers &&
            (self.u128_type.is_compatible_with(typ) || self.i128_type.is_compatible_with(typ))
    }

    pub fn is_non_native_int_type(&self, typ: Type<'gcc>) -> bool {
        !self.supports_128bit_integers &&
            (self.u128_type.is_compatible_with(typ) || self.i128_type.is_compatible_with(typ))
    }

    pub fn is_native_int_type_or_bool(&self, typ: Type<'gcc>) -> bool {
        self.is_native_int_type(typ) || typ.is_compatible_with(self.bool_type)
    }

    pub fn is_int_type_or_bool(&self, typ: Type<'gcc>) -> bool {
        self.is_native_int_type(typ) || self.is_non_native_int_type(typ) || typ.is_compatible_with(self.bool_type)
    }

    pub fn sess(&self) -> &'tcx Session {
        &self.tcx.sess
    }

    pub fn bitcast_if_needed(&self, value: RValue<'gcc>, expected_type: Type<'gcc>) -> RValue<'gcc> {
        if value.get_type() != expected_type {
            self.context.new_bitcast(None, value, expected_type)
        }
        else {
            value
        }
    }
}

impl<'gcc, 'tcx> BackendTypes for CodegenCx<'gcc, 'tcx> {
    type Value = RValue<'gcc>;
    type Function = RValue<'gcc>;

    type BasicBlock = Block<'gcc>;
    type Type = Type<'gcc>;
    type Funclet = (); // TODO(antoyo)

    type DIScope = (); // TODO(antoyo)
    type DILocation = (); // TODO(antoyo)
    type DIVariable = (); // TODO(antoyo)
}

impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
    fn vtables(&self) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<PolyExistentialTraitRef<'tcx>>), RValue<'gcc>>> {
        &self.vtables
    }

    fn get_fn(&self, instance: Instance<'tcx>) -> RValue<'gcc> {
        let func = get_fn(self, instance);
        *self.current_func.borrow_mut() = Some(func);
        // FIXME(antoyo): this is a wrong cast. That requires changing the compiler API.
        unsafe { std::mem::transmute(func) }
    }

    fn get_fn_addr(&self, instance: Instance<'tcx>) -> RValue<'gcc> {
        let func_name = self.tcx.symbol_name(instance).name;

        let func =
            if self.intrinsics.borrow().contains_key(func_name) {
                self.intrinsics.borrow()[func_name].clone()
            }
            else {
                get_fn(self, instance)
            };
        let ptr = func.get_address(None);

        // TODO(antoyo): don't do this twice: i.e. in declare_fn and here.
        // FIXME(antoyo): the rustc API seems to call get_fn_addr() when not needed (e.g. for FFI).

        self.normal_function_addresses.borrow_mut().insert(ptr);
        self.function_address_names.borrow_mut().insert(ptr, func_name.to_string());

        ptr
    }

    fn eh_personality(&self) -> RValue<'gcc> {
        // The exception handling personality function.
        //
        // If our compilation unit has the `eh_personality` lang item somewhere
        // within it, then we just need to codegen that. Otherwise, we're
        // building an rlib which will depend on some upstream implementation of
        // this function, so we just codegen a generic reference to it. We don't
        // specify any of the types for the function, we just make it a symbol
        // that LLVM can later use.
        //
        // Note that MSVC is a little special here in that we don't use the
        // `eh_personality` lang item at all. Currently LLVM has support for
        // both Dwarf and SEH unwind mechanisms for MSVC targets and uses the
        // *name of the personality function* to decide what kind of unwind side
        // tables/landing pads to emit. It looks like Dwarf is used by default,
        // injecting a dependency on the `_Unwind_Resume` symbol for resuming
        // an "exception", but for MSVC we want to force SEH. This means that we
        // can't actually have the personality function be our standard
        // `rust_eh_personality` function, but rather we wired it up to the
        // CRT's custom personality function, which forces LLVM to consider
        // landing pads as "landing pads for SEH".
        if let Some(llpersonality) = self.eh_personality.get() {
            return llpersonality;
        }
        let tcx = self.tcx;
        let func =
            match tcx.lang_items().eh_personality() {
                Some(def_id) if !wants_msvc_seh(self.sess()) => {
                    let instance =
                        ty::Instance::resolve(
                            tcx,
                            ty::ParamEnv::reveal_all(),
                            def_id,
                            ty::List::empty(),
                        )
                        .unwrap().unwrap();

                    let symbol_name = tcx.symbol_name(instance).name;
                    let fn_abi = self.fn_abi_of_instance(instance, ty::List::empty());
                    self.linkage.set(FunctionType::Extern);
                    let func = self.declare_fn(symbol_name, &fn_abi);
                    let func: RValue<'gcc> = unsafe { std::mem::transmute(func) };
                    func
                },
                _ => {
                    let name =
                        if wants_msvc_seh(self.sess()) {
                            "__CxxFrameHandler3"
                        }
                        else {
                            "rust_eh_personality"
                        };
                    let func = self.declare_func(name, self.type_i32(), &[], true);
                    unsafe { std::mem::transmute(func) }
                }
            };
        // TODO(antoyo): apply target cpu attributes.
        self.eh_personality.set(Some(func));
        func
    }

    fn sess(&self) -> &Session {
        &self.tcx.sess
    }

    fn check_overflow(&self) -> bool {
        self.check_overflow
    }

    fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
        self.codegen_unit
    }

    fn set_frame_pointer_type(&self, _llfn: RValue<'gcc>) {
        // TODO(antoyo)
    }

    fn apply_target_cpu_attr(&self, _llfn: RValue<'gcc>) {
        // TODO(antoyo)
    }

    fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
        let entry_name = self.sess().target.entry_name.as_ref();
        if self.get_declared_value(entry_name).is_none() {
            Some(self.declare_entry_fn(entry_name, fn_type, ()))
        }
        else {
            // If the symbol already exists, it is an error: for example, the user wrote
            // #[no_mangle] extern "C" fn main(..) {..}
            // instead of #[start]
            None
        }
    }
}

impl<'gcc, 'tcx> HasTyCtxt<'tcx> for CodegenCx<'gcc, 'tcx> {
    fn tcx(&self) -> TyCtxt<'tcx> {
        self.tcx
    }
}

impl<'gcc, 'tcx> HasDataLayout for CodegenCx<'gcc, 'tcx> {
    fn data_layout(&self) -> &TargetDataLayout {
        &self.tcx.data_layout
    }
}

impl<'gcc, 'tcx> HasTargetSpec for CodegenCx<'gcc, 'tcx> {
    fn target_spec(&self) -> &Target {
        &self.tcx.sess.target
    }
}

impl<'gcc, 'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'gcc, 'tcx> {
    type LayoutOfResult = TyAndLayout<'tcx>;

    #[inline]
    fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
        if let LayoutError::SizeOverflow(_) = err {
            self.sess().emit_fatal(respan(span, err))
        } else {
            span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
        }
    }
}

impl<'gcc, 'tcx> FnAbiOfHelpers<'tcx> for CodegenCx<'gcc, 'tcx> {
    type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>;

    #[inline]
    fn handle_fn_abi_err(
        &self,
        err: FnAbiError<'tcx>,
        span: Span,
        fn_abi_request: FnAbiRequest<'tcx>,
    ) -> ! {
        if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
            self.sess().emit_fatal(respan(span, err))
        } else {
            match fn_abi_request {
                FnAbiRequest::OfFnPtr { sig, extra_args } => {
                    span_bug!(
                        span,
                        "`fn_abi_of_fn_ptr({}, {:?})` failed: {}",
                        sig,
                        extra_args,
                        err
                    );
                }
                FnAbiRequest::OfInstance { instance, extra_args } => {
                    span_bug!(
                        span,
                        "`fn_abi_of_instance({}, {:?})` failed: {}",
                        instance,
                        extra_args,
                        err
                    );
                }
            }
        }
    }
}

impl<'tcx, 'gcc> HasParamEnv<'tcx> for CodegenCx<'gcc, 'tcx> {
    fn param_env(&self) -> ParamEnv<'tcx> {
        ParamEnv::reveal_all()
    }
}

impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
    /// Generates a new symbol name with the given prefix. This symbol name must
    /// only be used for definitions with `internal` or `private` linkage.
    pub fn generate_local_symbol_name(&self, prefix: &str) -> String {
        let idx = self.local_gen_sym_counter.get();
        self.local_gen_sym_counter.set(idx + 1);
        // Include a '.' character, so there can be no accidental conflicts with
        // user defined names
        let mut name = String::with_capacity(prefix.len() + 6);
        name.push_str(prefix);
        name.push_str(".");
        base_n::push_str(idx as u128, base_n::ALPHANUMERIC_ONLY, &mut name);
        name
    }
}

fn to_gcc_tls_mode(tls_model: TlsModel) -> gccjit::TlsModel {
    match tls_model {
        TlsModel::GeneralDynamic => gccjit::TlsModel::GlobalDynamic,
        TlsModel::LocalDynamic => gccjit::TlsModel::LocalDynamic,
        TlsModel::InitialExec => gccjit::TlsModel::InitialExec,
        TlsModel::LocalExec => gccjit::TlsModel::LocalExec,
    }
}