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9346a6ac | 1 | // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT |
1a4d82fc JJ |
2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
54a0048b | 10 | |
9346a6ac AL |
11 | //! Translate the completed AST to the LLVM IR. |
12 | //! | |
13 | //! Some functions here, such as trans_block and trans_expr, return a value -- | |
54a0048b SL |
14 | //! the result of the translation to LLVM -- while others, such as trans_fn |
15 | //! and trans_item, are called only for the side effect of adding a | |
9346a6ac AL |
16 | //! particular definition to the LLVM IR output we're producing. |
17 | //! | |
18 | //! Hopefully useful general knowledge about trans: | |
19 | //! | |
20 | //! * There's no way to find out the Ty type of a ValueRef. Doing so | |
21 | //! would be "trying to get the eggs out of an omelette" (credit: | |
22 | //! pcwalton). You can, instead, find out its TypeRef by calling val_ty, | |
23 | //! but one TypeRef corresponds to many `Ty`s; for instance, tup(int, int, | |
24 | //! int) and rec(x=int, y=int, z=int) will have the same TypeRef. | |
1a4d82fc | 25 | |
5bcae85e SL |
26 | use super::ModuleLlvm; |
27 | use super::ModuleSource; | |
1a4d82fc | 28 | use super::ModuleTranslation; |
3b2f2976 | 29 | use super::ModuleKind; |
1a4d82fc | 30 | |
5bcae85e | 31 | use assert_module_sources; |
3157f602 XL |
32 | use back::link; |
33 | use back::linker::LinkerInfo; | |
476ff2be | 34 | use back::symbol_export::{self, ExportedSymbols}; |
3b2f2976 | 35 | use back::write::{self, OngoingCrateTranslation}; |
cc61c64b | 36 | use llvm::{ContextRef, Linkage, ModuleRef, ValueRef, Vector, get_param}; |
1a4d82fc | 37 | use llvm; |
7cac9316 | 38 | use metadata; |
cc61c64b | 39 | use rustc::hir::def_id::LOCAL_CRATE; |
7cac9316 | 40 | use rustc::middle::lang_items::StartFnLangItem; |
3b2f2976 | 41 | use rustc::middle::cstore::{EncodedMetadata, EncodedMetadataHashes}; |
32a655c1 | 42 | use rustc::ty::{self, Ty, TyCtxt}; |
cc61c64b XL |
43 | use rustc::dep_graph::AssertDepGraphSafe; |
44 | use rustc::middle::cstore::LinkMeta; | |
54a0048b | 45 | use rustc::hir::map as hir_map; |
3b2f2976 XL |
46 | use rustc::util::common::{time, print_time_passes_entry}; |
47 | use rustc::session::config::{self, NoDebugInfo, OutputFilenames, OutputType}; | |
7cac9316 | 48 | use rustc::session::Session; |
3b2f2976 | 49 | use rustc_incremental::{self, IncrementalHashesMap}; |
cc61c64b | 50 | use abi; |
041b39d2 | 51 | use allocator; |
32a655c1 | 52 | use mir::lvalue::LvalueRef; |
54a0048b | 53 | use attributes; |
32a655c1 | 54 | use builder::Builder; |
cc61c64b | 55 | use callee; |
32a655c1 | 56 | use common::{C_bool, C_bytes_in_context, C_i32, C_uint}; |
5bcae85e | 57 | use collector::{self, TransItemCollectionMode}; |
cc61c64b | 58 | use common::{C_struct_in_context, C_u64, C_undef, C_array}; |
32a655c1 | 59 | use common::CrateContext; |
9e0c209e | 60 | use common::{type_is_zero_size, val_ty}; |
54a0048b SL |
61 | use common; |
62 | use consts; | |
cc61c64b | 63 | use context::{self, LocalCrateContext, SharedCrateContext, Stats}; |
32a655c1 | 64 | use debuginfo; |
54a0048b | 65 | use declare; |
54a0048b | 66 | use machine; |
54a0048b SL |
67 | use meth; |
68 | use mir; | |
69 | use monomorphize::{self, Instance}; | |
a7813a04 | 70 | use partitioning::{self, PartitioningStrategy, CodegenUnit}; |
54a0048b | 71 | use symbol_names_test; |
3b2f2976 | 72 | use time_graph; |
476ff2be | 73 | use trans_item::{TransItem, DefPathBasedNames}; |
54a0048b SL |
74 | use type_::Type; |
75 | use type_of; | |
54a0048b | 76 | use value::Value; |
7cac9316 | 77 | use rustc::util::nodemap::{NodeSet, FxHashMap, FxHashSet}; |
1a4d82fc | 78 | |
9346a6ac | 79 | use libc::c_uint; |
85aaf69f | 80 | use std::ffi::{CStr, CString}; |
1a4d82fc | 81 | use std::str; |
3b2f2976 XL |
82 | use std::sync::Arc; |
83 | use std::time::{Instant, Duration}; | |
9e0c209e | 84 | use std::i32; |
cc61c64b | 85 | use syntax_pos::Span; |
b039eaaf | 86 | use syntax::attr; |
54a0048b | 87 | use rustc::hir; |
e9174d1e | 88 | use syntax::ast; |
1a4d82fc | 89 | |
32a655c1 | 90 | use mir::lvalue::Alignment; |
1a4d82fc JJ |
91 | |
92 | pub struct StatRecorder<'a, 'tcx: 'a> { | |
93 | ccx: &'a CrateContext<'a, 'tcx>, | |
94 | name: Option<String>, | |
c34b1796 | 95 | istart: usize, |
1a4d82fc JJ |
96 | } |
97 | ||
98 | impl<'a, 'tcx> StatRecorder<'a, 'tcx> { | |
92a42be0 | 99 | pub fn new(ccx: &'a CrateContext<'a, 'tcx>, name: String) -> StatRecorder<'a, 'tcx> { |
1a4d82fc JJ |
100 | let istart = ccx.stats().n_llvm_insns.get(); |
101 | StatRecorder { | |
3b2f2976 | 102 | ccx, |
1a4d82fc | 103 | name: Some(name), |
3b2f2976 | 104 | istart, |
1a4d82fc JJ |
105 | } |
106 | } | |
107 | } | |
108 | ||
1a4d82fc JJ |
109 | impl<'a, 'tcx> Drop for StatRecorder<'a, 'tcx> { |
110 | fn drop(&mut self) { | |
111 | if self.ccx.sess().trans_stats() { | |
112 | let iend = self.ccx.stats().n_llvm_insns.get(); | |
32a655c1 | 113 | self.ccx.stats().fn_stats.borrow_mut() |
92a42be0 | 114 | .push((self.name.take().unwrap(), iend - self.istart)); |
1a4d82fc JJ |
115 | self.ccx.stats().n_fns.set(self.ccx.stats().n_fns.get() + 1); |
116 | // Reset LLVM insn count to avoid compound costs. | |
117 | self.ccx.stats().n_llvm_insns.set(self.istart); | |
118 | } | |
119 | } | |
120 | } | |
121 | ||
32a655c1 SL |
122 | pub fn get_meta(bcx: &Builder, fat_ptr: ValueRef) -> ValueRef { |
123 | bcx.struct_gep(fat_ptr, abi::FAT_PTR_EXTRA) | |
9e0c209e SL |
124 | } |
125 | ||
32a655c1 SL |
126 | pub fn get_dataptr(bcx: &Builder, fat_ptr: ValueRef) -> ValueRef { |
127 | bcx.struct_gep(fat_ptr, abi::FAT_PTR_ADDR) | |
1a4d82fc JJ |
128 | } |
129 | ||
54a0048b | 130 | pub fn bin_op_to_icmp_predicate(op: hir::BinOp_, |
92a42be0 | 131 | signed: bool) |
85aaf69f SL |
132 | -> llvm::IntPredicate { |
133 | match op { | |
e9174d1e SL |
134 | hir::BiEq => llvm::IntEQ, |
135 | hir::BiNe => llvm::IntNE, | |
136 | hir::BiLt => if signed { llvm::IntSLT } else { llvm::IntULT }, | |
137 | hir::BiLe => if signed { llvm::IntSLE } else { llvm::IntULE }, | |
138 | hir::BiGt => if signed { llvm::IntSGT } else { llvm::IntUGT }, | |
139 | hir::BiGe => if signed { llvm::IntSGE } else { llvm::IntUGE }, | |
85aaf69f | 140 | op => { |
54a0048b SL |
141 | bug!("comparison_op_to_icmp_predicate: expected comparison operator, \ |
142 | found {:?}", | |
143 | op) | |
85aaf69f | 144 | } |
1a4d82fc JJ |
145 | } |
146 | } | |
147 | ||
54a0048b | 148 | pub fn bin_op_to_fcmp_predicate(op: hir::BinOp_) -> llvm::RealPredicate { |
85aaf69f | 149 | match op { |
e9174d1e SL |
150 | hir::BiEq => llvm::RealOEQ, |
151 | hir::BiNe => llvm::RealUNE, | |
152 | hir::BiLt => llvm::RealOLT, | |
153 | hir::BiLe => llvm::RealOLE, | |
154 | hir::BiGt => llvm::RealOGT, | |
155 | hir::BiGe => llvm::RealOGE, | |
85aaf69f | 156 | op => { |
54a0048b SL |
157 | bug!("comparison_op_to_fcmp_predicate: expected comparison operator, \ |
158 | found {:?}", | |
159 | op); | |
92a42be0 SL |
160 | } |
161 | } | |
162 | } | |
163 | ||
32a655c1 SL |
164 | pub fn compare_simd_types<'a, 'tcx>( |
165 | bcx: &Builder<'a, 'tcx>, | |
166 | lhs: ValueRef, | |
167 | rhs: ValueRef, | |
168 | t: Ty<'tcx>, | |
169 | ret_ty: Type, | |
170 | op: hir::BinOp_ | |
171 | ) -> ValueRef { | |
85aaf69f | 172 | let signed = match t.sty { |
62682a34 | 173 | ty::TyFloat(_) => { |
54a0048b | 174 | let cmp = bin_op_to_fcmp_predicate(op); |
32a655c1 | 175 | return bcx.sext(bcx.fcmp(cmp, lhs, rhs), ret_ty); |
1a4d82fc | 176 | }, |
62682a34 SL |
177 | ty::TyUint(_) => false, |
178 | ty::TyInt(_) => true, | |
54a0048b | 179 | _ => bug!("compare_simd_types: invalid SIMD type"), |
85aaf69f SL |
180 | }; |
181 | ||
54a0048b | 182 | let cmp = bin_op_to_icmp_predicate(op, signed); |
85aaf69f SL |
183 | // LLVM outputs an `< size x i1 >`, so we need to perform a sign extension |
184 | // to get the correctly sized type. This will compile to a single instruction | |
185 | // once the IR is converted to assembly if the SIMD instruction is supported | |
186 | // by the target architecture. | |
32a655c1 | 187 | bcx.sext(bcx.icmp(cmp, lhs, rhs), ret_ty) |
1a4d82fc JJ |
188 | } |
189 | ||
92a42be0 SL |
190 | /// Retrieve the information we are losing (making dynamic) in an unsizing |
191 | /// adjustment. | |
192 | /// | |
193 | /// The `old_info` argument is a bit funny. It is intended for use | |
3b2f2976 | 194 | /// in an upcast, where the new vtable for an object will be derived |
92a42be0 SL |
195 | /// from the old one. |
196 | pub fn unsized_info<'ccx, 'tcx>(ccx: &CrateContext<'ccx, 'tcx>, | |
197 | source: Ty<'tcx>, | |
198 | target: Ty<'tcx>, | |
54a0048b | 199 | old_info: Option<ValueRef>) |
92a42be0 SL |
200 | -> ValueRef { |
201 | let (source, target) = ccx.tcx().struct_lockstep_tails(source, target); | |
202 | match (&source.sty, &target.sty) { | |
203 | (&ty::TyArray(_, len), &ty::TySlice(_)) => C_uint(ccx, len), | |
476ff2be | 204 | (&ty::TyDynamic(..), &ty::TyDynamic(..)) => { |
92a42be0 SL |
205 | // For now, upcasts are limited to changes in marker |
206 | // traits, and hence never actually require an actual | |
207 | // change to the vtable. | |
208 | old_info.expect("unsized_info: missing old info for trait upcast") | |
209 | } | |
476ff2be SL |
210 | (_, &ty::TyDynamic(ref data, ..)) => { |
211 | consts::ptrcast(meth::get_vtable(ccx, source, data.principal()), | |
92a42be0 SL |
212 | Type::vtable_ptr(ccx)) |
213 | } | |
54a0048b | 214 | _ => bug!("unsized_info: invalid unsizing {:?} -> {:?}", |
92a42be0 | 215 | source, |
54a0048b | 216 | target), |
92a42be0 SL |
217 | } |
218 | } | |
219 | ||
220 | /// Coerce `src` to `dst_ty`. `src_ty` must be a thin pointer. | |
32a655c1 SL |
221 | pub fn unsize_thin_ptr<'a, 'tcx>( |
222 | bcx: &Builder<'a, 'tcx>, | |
223 | src: ValueRef, | |
224 | src_ty: Ty<'tcx>, | |
225 | dst_ty: Ty<'tcx> | |
226 | ) -> (ValueRef, ValueRef) { | |
92a42be0 SL |
227 | debug!("unsize_thin_ptr: {:?} => {:?}", src_ty, dst_ty); |
228 | match (&src_ty.sty, &dst_ty.sty) { | |
92a42be0 SL |
229 | (&ty::TyRef(_, ty::TypeAndMut { ty: a, .. }), |
230 | &ty::TyRef(_, ty::TypeAndMut { ty: b, .. })) | | |
231 | (&ty::TyRef(_, ty::TypeAndMut { ty: a, .. }), | |
232 | &ty::TyRawPtr(ty::TypeAndMut { ty: b, .. })) | | |
233 | (&ty::TyRawPtr(ty::TypeAndMut { ty: a, .. }), | |
234 | &ty::TyRawPtr(ty::TypeAndMut { ty: b, .. })) => { | |
32a655c1 SL |
235 | assert!(bcx.ccx.shared().type_is_sized(a)); |
236 | let ptr_ty = type_of::in_memory_type_of(bcx.ccx, b).ptr_to(); | |
237 | (bcx.pointercast(src, ptr_ty), unsized_info(bcx.ccx, a, b, None)) | |
238 | } | |
239 | (&ty::TyAdt(def_a, _), &ty::TyAdt(def_b, _)) if def_a.is_box() && def_b.is_box() => { | |
240 | let (a, b) = (src_ty.boxed_ty(), dst_ty.boxed_ty()); | |
241 | assert!(bcx.ccx.shared().type_is_sized(a)); | |
242 | let ptr_ty = type_of::in_memory_type_of(bcx.ccx, b).ptr_to(); | |
243 | (bcx.pointercast(src, ptr_ty), unsized_info(bcx.ccx, a, b, None)) | |
92a42be0 | 244 | } |
54a0048b | 245 | _ => bug!("unsize_thin_ptr: called on bad types"), |
92a42be0 SL |
246 | } |
247 | } | |
248 | ||
249 | /// Coerce `src`, which is a reference to a value of type `src_ty`, | |
250 | /// to a value of type `dst_ty` and store the result in `dst` | |
32a655c1 SL |
251 | pub fn coerce_unsized_into<'a, 'tcx>(bcx: &Builder<'a, 'tcx>, |
252 | src: &LvalueRef<'tcx>, | |
253 | dst: &LvalueRef<'tcx>) { | |
254 | let src_ty = src.ty.to_ty(bcx.tcx()); | |
255 | let dst_ty = dst.ty.to_ty(bcx.tcx()); | |
256 | let coerce_ptr = || { | |
257 | let (base, info) = if common::type_is_fat_ptr(bcx.ccx, src_ty) { | |
258 | // fat-ptr to fat-ptr unsize preserves the vtable | |
259 | // i.e. &'a fmt::Debug+Send => &'a fmt::Debug | |
260 | // So we need to pointercast the base to ensure | |
261 | // the types match up. | |
262 | let (base, info) = load_fat_ptr(bcx, src.llval, src.alignment, src_ty); | |
263 | let llcast_ty = type_of::fat_ptr_base_ty(bcx.ccx, dst_ty); | |
264 | let base = bcx.pointercast(base, llcast_ty); | |
265 | (base, info) | |
266 | } else { | |
267 | let base = load_ty(bcx, src.llval, src.alignment, src_ty); | |
268 | unsize_thin_ptr(bcx, base, src_ty, dst_ty) | |
269 | }; | |
270 | store_fat_ptr(bcx, base, info, dst.llval, dst.alignment, dst_ty); | |
271 | }; | |
92a42be0 | 272 | match (&src_ty.sty, &dst_ty.sty) { |
92a42be0 SL |
273 | (&ty::TyRef(..), &ty::TyRef(..)) | |
274 | (&ty::TyRef(..), &ty::TyRawPtr(..)) | | |
275 | (&ty::TyRawPtr(..), &ty::TyRawPtr(..)) => { | |
32a655c1 SL |
276 | coerce_ptr() |
277 | } | |
278 | (&ty::TyAdt(def_a, _), &ty::TyAdt(def_b, _)) if def_a.is_box() && def_b.is_box() => { | |
279 | coerce_ptr() | |
92a42be0 SL |
280 | } |
281 | ||
9e0c209e | 282 | (&ty::TyAdt(def_a, substs_a), &ty::TyAdt(def_b, substs_b)) => { |
92a42be0 SL |
283 | assert_eq!(def_a, def_b); |
284 | ||
9e0c209e SL |
285 | let src_fields = def_a.variants[0].fields.iter().map(|f| { |
286 | monomorphize::field_ty(bcx.tcx(), substs_a, f) | |
287 | }); | |
288 | let dst_fields = def_b.variants[0].fields.iter().map(|f| { | |
289 | monomorphize::field_ty(bcx.tcx(), substs_b, f) | |
290 | }); | |
92a42be0 | 291 | |
9e0c209e | 292 | let iter = src_fields.zip(dst_fields).enumerate(); |
92a42be0 | 293 | for (i, (src_fty, dst_fty)) in iter { |
32a655c1 | 294 | if type_is_zero_size(bcx.ccx, dst_fty) { |
92a42be0 SL |
295 | continue; |
296 | } | |
297 | ||
32a655c1 SL |
298 | let (src_f, src_f_align) = src.trans_field_ptr(bcx, i); |
299 | let (dst_f, dst_f_align) = dst.trans_field_ptr(bcx, i); | |
92a42be0 | 300 | if src_fty == dst_fty { |
32a655c1 | 301 | memcpy_ty(bcx, dst_f, src_f, src_fty, None); |
92a42be0 | 302 | } else { |
32a655c1 SL |
303 | coerce_unsized_into( |
304 | bcx, | |
305 | &LvalueRef::new_sized_ty(src_f, src_fty, src_f_align), | |
306 | &LvalueRef::new_sized_ty(dst_f, dst_fty, dst_f_align) | |
307 | ); | |
92a42be0 SL |
308 | } |
309 | } | |
310 | } | |
54a0048b SL |
311 | _ => bug!("coerce_unsized_into: invalid coercion {:?} -> {:?}", |
312 | src_ty, | |
313 | dst_ty), | |
92a42be0 | 314 | } |
1a4d82fc JJ |
315 | } |
316 | ||
32a655c1 SL |
317 | pub fn cast_shift_expr_rhs( |
318 | cx: &Builder, op: hir::BinOp_, lhs: ValueRef, rhs: ValueRef | |
319 | ) -> ValueRef { | |
320 | cast_shift_rhs(op, lhs, rhs, |a, b| cx.trunc(a, b), |a, b| cx.zext(a, b)) | |
92a42be0 SL |
321 | } |
322 | ||
323 | pub fn cast_shift_const_rhs(op: hir::BinOp_, lhs: ValueRef, rhs: ValueRef) -> ValueRef { | |
324 | cast_shift_rhs(op, | |
325 | lhs, | |
326 | rhs, | |
1a4d82fc JJ |
327 | |a, b| unsafe { llvm::LLVMConstTrunc(a, b.to_ref()) }, |
328 | |a, b| unsafe { llvm::LLVMConstZExt(a, b.to_ref()) }) | |
329 | } | |
330 | ||
e9174d1e | 331 | fn cast_shift_rhs<F, G>(op: hir::BinOp_, |
c34b1796 AL |
332 | lhs: ValueRef, |
333 | rhs: ValueRef, | |
334 | trunc: F, | |
335 | zext: G) | |
92a42be0 SL |
336 | -> ValueRef |
337 | where F: FnOnce(ValueRef, Type) -> ValueRef, | |
338 | G: FnOnce(ValueRef, Type) -> ValueRef | |
1a4d82fc JJ |
339 | { |
340 | // Shifts may have any size int on the rhs | |
54a0048b | 341 | if op.is_shift() { |
85aaf69f SL |
342 | let mut rhs_llty = val_ty(rhs); |
343 | let mut lhs_llty = val_ty(lhs); | |
92a42be0 SL |
344 | if rhs_llty.kind() == Vector { |
345 | rhs_llty = rhs_llty.element_type() | |
346 | } | |
347 | if lhs_llty.kind() == Vector { | |
348 | lhs_llty = lhs_llty.element_type() | |
349 | } | |
85aaf69f SL |
350 | let rhs_sz = rhs_llty.int_width(); |
351 | let lhs_sz = lhs_llty.int_width(); | |
352 | if lhs_sz < rhs_sz { | |
353 | trunc(rhs, lhs_llty) | |
354 | } else if lhs_sz > rhs_sz { | |
355 | // FIXME (#1877: If shifting by negative | |
356 | // values becomes not undefined then this is wrong. | |
357 | zext(rhs, lhs_llty) | |
1a4d82fc JJ |
358 | } else { |
359 | rhs | |
360 | } | |
85aaf69f SL |
361 | } else { |
362 | rhs | |
1a4d82fc JJ |
363 | } |
364 | } | |
365 | ||
e9174d1e SL |
366 | /// Returns whether this session's target will use SEH-based unwinding. |
367 | /// | |
368 | /// This is only true for MSVC targets, and even then the 64-bit MSVC target | |
369 | /// currently uses SEH-ish unwinding with DWARF info tables to the side (same as | |
370 | /// 64-bit MinGW) instead of "full SEH". | |
371 | pub fn wants_msvc_seh(sess: &Session) -> bool { | |
7453a54e | 372 | sess.target.target.options.is_like_msvc |
e9174d1e SL |
373 | } |
374 | ||
c30ab7b3 SL |
375 | pub fn call_assume<'a, 'tcx>(b: &Builder<'a, 'tcx>, val: ValueRef) { |
376 | let assume_intrinsic = b.ccx.get_intrinsic("llvm.assume"); | |
377 | b.call(assume_intrinsic, &[val], None); | |
378 | } | |
379 | ||
1a4d82fc JJ |
380 | /// Helper for loading values from memory. Does the necessary conversion if the in-memory type |
381 | /// differs from the type used for SSA values. Also handles various special cases where the type | |
382 | /// gives us better information about what we are loading. | |
32a655c1 SL |
383 | pub fn load_ty<'a, 'tcx>(b: &Builder<'a, 'tcx>, ptr: ValueRef, |
384 | alignment: Alignment, t: Ty<'tcx>) -> ValueRef { | |
54a0048b SL |
385 | let ccx = b.ccx; |
386 | if type_is_zero_size(ccx, t) { | |
387 | return C_undef(type_of::type_of(ccx, t)); | |
c34b1796 AL |
388 | } |
389 | ||
390 | unsafe { | |
391 | let global = llvm::LLVMIsAGlobalVariable(ptr); | |
392 | if !global.is_null() && llvm::LLVMIsGlobalConstant(global) == llvm::True { | |
393 | let val = llvm::LLVMGetInitializer(global); | |
394 | if !val.is_null() { | |
54a0048b SL |
395 | if t.is_bool() { |
396 | return llvm::LLVMConstTrunc(val, Type::i1(ccx).to_ref()); | |
397 | } | |
398 | return val; | |
85aaf69f SL |
399 | } |
400 | } | |
1a4d82fc | 401 | } |
c34b1796 | 402 | |
54a0048b | 403 | if t.is_bool() { |
32a655c1 SL |
404 | b.trunc(b.load_range_assert(ptr, 0, 2, llvm::False, alignment.to_align()), |
405 | Type::i1(ccx)) | |
c1a9b12d | 406 | } else if t.is_char() { |
c34b1796 AL |
407 | // a char is a Unicode codepoint, and so takes values from 0 |
408 | // to 0x10FFFF inclusive only. | |
32a655c1 | 409 | b.load_range_assert(ptr, 0, 0x10FFFF + 1, llvm::False, alignment.to_align()) |
cc61c64b XL |
410 | } else if (t.is_region_ptr() || t.is_box() || t.is_fn()) |
411 | && !common::type_is_fat_ptr(ccx, t) | |
412 | { | |
32a655c1 | 413 | b.load_nonnull(ptr, alignment.to_align()) |
c34b1796 | 414 | } else { |
32a655c1 | 415 | b.load(ptr, alignment.to_align()) |
d9579d0f | 416 | } |
1a4d82fc JJ |
417 | } |
418 | ||
419 | /// Helper for storing values in memory. Does the necessary conversion if the in-memory type | |
420 | /// differs from the type used for SSA values. | |
32a655c1 SL |
421 | pub fn store_ty<'a, 'tcx>(cx: &Builder<'a, 'tcx>, v: ValueRef, dst: ValueRef, |
422 | dst_align: Alignment, t: Ty<'tcx>) { | |
54a0048b | 423 | debug!("store_ty: {:?} : {:?} <- {:?}", Value(dst), t, Value(v)); |
92a42be0 | 424 | |
32a655c1 SL |
425 | if common::type_is_fat_ptr(cx.ccx, t) { |
426 | let lladdr = cx.extract_value(v, abi::FAT_PTR_ADDR); | |
427 | let llextra = cx.extract_value(v, abi::FAT_PTR_EXTRA); | |
428 | store_fat_ptr(cx, lladdr, llextra, dst, dst_align, t); | |
c1a9b12d | 429 | } else { |
32a655c1 | 430 | cx.store(from_immediate(cx, v), dst, dst_align.to_align()); |
d9579d0f | 431 | } |
c34b1796 AL |
432 | } |
433 | ||
32a655c1 SL |
434 | pub fn store_fat_ptr<'a, 'tcx>(cx: &Builder<'a, 'tcx>, |
435 | data: ValueRef, | |
436 | extra: ValueRef, | |
437 | dst: ValueRef, | |
438 | dst_align: Alignment, | |
439 | _ty: Ty<'tcx>) { | |
92a42be0 | 440 | // FIXME: emit metadata |
32a655c1 SL |
441 | cx.store(data, get_dataptr(cx, dst), dst_align.to_align()); |
442 | cx.store(extra, get_meta(cx, dst), dst_align.to_align()); | |
c30ab7b3 SL |
443 | } |
444 | ||
32a655c1 SL |
445 | pub fn load_fat_ptr<'a, 'tcx>( |
446 | b: &Builder<'a, 'tcx>, src: ValueRef, alignment: Alignment, t: Ty<'tcx> | |
447 | ) -> (ValueRef, ValueRef) { | |
448 | let ptr = get_dataptr(b, src); | |
449 | let ptr = if t.is_region_ptr() || t.is_box() { | |
450 | b.load_nonnull(ptr, alignment.to_align()) | |
c30ab7b3 | 451 | } else { |
32a655c1 | 452 | b.load(ptr, alignment.to_align()) |
c30ab7b3 SL |
453 | }; |
454 | ||
8bb4bdeb XL |
455 | let meta = get_meta(b, src); |
456 | let meta_ty = val_ty(meta); | |
457 | // If the 'meta' field is a pointer, it's a vtable, so use load_nonnull | |
458 | // instead | |
459 | let meta = if meta_ty.element_type().kind() == llvm::TypeKind::Pointer { | |
460 | b.load_nonnull(meta, None) | |
461 | } else { | |
462 | b.load(meta, None) | |
463 | }; | |
c30ab7b3 SL |
464 | |
465 | (ptr, meta) | |
92a42be0 SL |
466 | } |
467 | ||
32a655c1 SL |
468 | pub fn from_immediate(bcx: &Builder, val: ValueRef) -> ValueRef { |
469 | if val_ty(val) == Type::i1(bcx.ccx) { | |
470 | bcx.zext(val, Type::i8(bcx.ccx)) | |
c34b1796 AL |
471 | } else { |
472 | val | |
473 | } | |
474 | } | |
475 | ||
32a655c1 | 476 | pub fn to_immediate(bcx: &Builder, val: ValueRef, ty: Ty) -> ValueRef { |
c1a9b12d | 477 | if ty.is_bool() { |
32a655c1 | 478 | bcx.trunc(val, Type::i1(bcx.ccx)) |
c34b1796 AL |
479 | } else { |
480 | val | |
481 | } | |
482 | } | |
483 | ||
a7813a04 | 484 | pub enum Lifetime { Start, End } |
9cc50fc6 | 485 | |
a7813a04 | 486 | impl Lifetime { |
32a655c1 SL |
487 | // If LLVM lifetime intrinsic support is enabled (i.e. optimizations |
488 | // on), and `ptr` is nonzero-sized, then extracts the size of `ptr` | |
489 | // and the intrinsic for `lt` and passes them to `emit`, which is in | |
490 | // charge of generating code to call the passed intrinsic on whatever | |
3b2f2976 | 491 | // block of generated code is targeted for the intrinsic. |
32a655c1 SL |
492 | // |
493 | // If LLVM lifetime intrinsic support is disabled (i.e. optimizations | |
494 | // off) or `ptr` is zero-sized, then no-op (does not call `emit`). | |
a7813a04 | 495 | pub fn call(self, b: &Builder, ptr: ValueRef) { |
32a655c1 SL |
496 | if b.ccx.sess().opts.optimize == config::OptLevel::No { |
497 | return; | |
498 | } | |
e9174d1e | 499 | |
32a655c1 SL |
500 | let size = machine::llsize_of_alloc(b.ccx, val_ty(ptr).element_type()); |
501 | if size == 0 { | |
502 | return; | |
503 | } | |
a7813a04 | 504 | |
32a655c1 SL |
505 | let lifetime_intrinsic = b.ccx.get_intrinsic(match self { |
506 | Lifetime::Start => "llvm.lifetime.start", | |
507 | Lifetime::End => "llvm.lifetime.end" | |
508 | }); | |
1a4d82fc | 509 | |
32a655c1 SL |
510 | let ptr = b.pointercast(ptr, Type::i8p(b.ccx)); |
511 | b.call(lifetime_intrinsic, &[C_u64(b.ccx, size), ptr], None); | |
92a42be0 SL |
512 | } |
513 | } | |
514 | ||
32a655c1 | 515 | pub fn call_memcpy<'a, 'tcx>(b: &Builder<'a, 'tcx>, |
54a0048b SL |
516 | dst: ValueRef, |
517 | src: ValueRef, | |
518 | n_bytes: ValueRef, | |
519 | align: u32) { | |
54a0048b | 520 | let ccx = b.ccx; |
cc61c64b | 521 | let ptr_width = &ccx.sess().target.target.target_pointer_width; |
e9174d1e | 522 | let key = format!("llvm.memcpy.p0i8.p0i8.i{}", ptr_width); |
1a4d82fc | 523 | let memcpy = ccx.get_intrinsic(&key); |
54a0048b SL |
524 | let src_ptr = b.pointercast(src, Type::i8p(ccx)); |
525 | let dst_ptr = b.pointercast(dst, Type::i8p(ccx)); | |
8bb4bdeb | 526 | let size = b.intcast(n_bytes, ccx.int_type(), false); |
1a4d82fc JJ |
527 | let align = C_i32(ccx, align as i32); |
528 | let volatile = C_bool(ccx, false); | |
54a0048b | 529 | b.call(memcpy, &[dst_ptr, src_ptr, size, align, volatile], None); |
1a4d82fc JJ |
530 | } |
531 | ||
32a655c1 SL |
532 | pub fn memcpy_ty<'a, 'tcx>( |
533 | bcx: &Builder<'a, 'tcx>, | |
534 | dst: ValueRef, | |
535 | src: ValueRef, | |
536 | t: Ty<'tcx>, | |
537 | align: Option<u32>, | |
538 | ) { | |
539 | let ccx = bcx.ccx; | |
1a4d82fc | 540 | |
cc61c64b XL |
541 | let size = ccx.size_of(t); |
542 | if size == 0 { | |
92a42be0 SL |
543 | return; |
544 | } | |
1a4d82fc | 545 | |
cc61c64b XL |
546 | let align = align.unwrap_or_else(|| ccx.align_of(t)); |
547 | call_memcpy(bcx, dst, src, C_uint(ccx, size), align); | |
54a0048b SL |
548 | } |
549 | ||
32a655c1 | 550 | pub fn call_memset<'a, 'tcx>(b: &Builder<'a, 'tcx>, |
cc61c64b XL |
551 | ptr: ValueRef, |
552 | fill_byte: ValueRef, | |
553 | size: ValueRef, | |
554 | align: ValueRef, | |
555 | volatile: bool) -> ValueRef { | |
556 | let ptr_width = &b.ccx.sess().target.target.target_pointer_width; | |
54a0048b | 557 | let intrinsic_key = format!("llvm.memset.p0i8.i{}", ptr_width); |
32a655c1 SL |
558 | let llintrinsicfn = b.ccx.get_intrinsic(&intrinsic_key); |
559 | let volatile = C_bool(b.ccx, volatile); | |
560 | b.call(llintrinsicfn, &[ptr, fill_byte, size, align, volatile], None) | |
1a4d82fc JJ |
561 | } |
562 | ||
476ff2be SL |
563 | pub fn trans_instance<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, instance: Instance<'tcx>) { |
564 | let _s = if ccx.sess().trans_stats() { | |
565 | let mut instance_name = String::new(); | |
566 | DefPathBasedNames::new(ccx.tcx(), true, true) | |
cc61c64b | 567 | .push_def_path(instance.def_id(), &mut instance_name); |
476ff2be SL |
568 | Some(StatRecorder::new(ccx, instance_name)) |
569 | } else { | |
570 | None | |
571 | }; | |
1a4d82fc | 572 | |
3157f602 XL |
573 | // this is an info! to allow collecting monomorphization statistics |
574 | // and to allow finding the last function before LLVM aborts from | |
575 | // release builds. | |
476ff2be | 576 | info!("trans_instance({})", instance); |
a7813a04 | 577 | |
cc61c64b | 578 | let fn_ty = common::instance_ty(ccx.shared(), &instance); |
8bb4bdeb XL |
579 | let sig = common::ty_fn_sig(ccx, fn_ty); |
580 | let sig = ccx.tcx().erase_late_bound_regions_and_normalize(&sig); | |
476ff2be SL |
581 | |
582 | let lldecl = match ccx.instances().borrow().get(&instance) { | |
583 | Some(&val) => val, | |
584 | None => bug!("Instance `{:?}` not already declared", instance) | |
585 | }; | |
586 | ||
587 | ccx.stats().n_closures.set(ccx.stats().n_closures.get() + 1); | |
588 | ||
cc61c64b XL |
589 | // The `uwtable` attribute according to LLVM is: |
590 | // | |
591 | // This attribute indicates that the ABI being targeted requires that an | |
592 | // unwind table entry be produced for this function even if we can show | |
593 | // that no exceptions passes by it. This is normally the case for the | |
594 | // ELF x86-64 abi, but it can be disabled for some compilation units. | |
595 | // | |
596 | // Typically when we're compiling with `-C panic=abort` (which implies this | |
597 | // `no_landing_pads` check) we don't need `uwtable` because we can't | |
598 | // generate any exceptions! On Windows, however, exceptions include other | |
599 | // events such as illegal instructions, segfaults, etc. This means that on | |
600 | // Windows we end up still needing the `uwtable` attribute even if the `-C | |
601 | // panic=abort` flag is passed. | |
602 | // | |
603 | // You can also find more info on why Windows is whitelisted here in: | |
604 | // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 | |
605 | if !ccx.sess().no_landing_pads() || | |
606 | ccx.sess().target.target.options.is_like_windows { | |
476ff2be SL |
607 | attributes::emit_uwtable(lldecl, true); |
608 | } | |
609 | ||
cc61c64b | 610 | let mir = ccx.tcx().instance_mir(instance.def); |
8bb4bdeb | 611 | mir::trans_mir(ccx, lldecl, &mir, instance, sig); |
1a4d82fc JJ |
612 | } |
613 | ||
1a4d82fc JJ |
614 | pub fn llvm_linkage_by_name(name: &str) -> Option<Linkage> { |
615 | // Use the names from src/llvm/docs/LangRef.rst here. Most types are only | |
616 | // applicable to variable declarations and may not really make sense for | |
617 | // Rust code in the first place but whitelist them anyway and trust that | |
618 | // the user knows what s/he's doing. Who knows, unanticipated use cases | |
619 | // may pop up in the future. | |
620 | // | |
621 | // ghost, dllimport, dllexport and linkonce_odr_autohide are not supported | |
622 | // and don't have to be, LLVM treats them as no-ops. | |
623 | match name { | |
9e0c209e SL |
624 | "appending" => Some(llvm::Linkage::AppendingLinkage), |
625 | "available_externally" => Some(llvm::Linkage::AvailableExternallyLinkage), | |
626 | "common" => Some(llvm::Linkage::CommonLinkage), | |
627 | "extern_weak" => Some(llvm::Linkage::ExternalWeakLinkage), | |
628 | "external" => Some(llvm::Linkage::ExternalLinkage), | |
629 | "internal" => Some(llvm::Linkage::InternalLinkage), | |
630 | "linkonce" => Some(llvm::Linkage::LinkOnceAnyLinkage), | |
631 | "linkonce_odr" => Some(llvm::Linkage::LinkOnceODRLinkage), | |
632 | "private" => Some(llvm::Linkage::PrivateLinkage), | |
633 | "weak" => Some(llvm::Linkage::WeakAnyLinkage), | |
634 | "weak_odr" => Some(llvm::Linkage::WeakODRLinkage), | |
1a4d82fc JJ |
635 | _ => None, |
636 | } | |
637 | } | |
638 | ||
5bcae85e SL |
639 | pub fn set_link_section(ccx: &CrateContext, |
640 | llval: ValueRef, | |
641 | attrs: &[ast::Attribute]) { | |
642 | if let Some(sect) = attr::first_attr_value_str_by_name(attrs, "link_section") { | |
476ff2be | 643 | if contains_null(§.as_str()) { |
3157f602 XL |
644 | ccx.sess().fatal(&format!("Illegal null byte in link_section value: `{}`", §)); |
645 | } | |
646 | unsafe { | |
476ff2be | 647 | let buf = CString::new(sect.as_str().as_bytes()).unwrap(); |
3157f602 XL |
648 | llvm::LLVMSetSection(llval, buf.as_ptr()); |
649 | } | |
c1a9b12d SL |
650 | } |
651 | } | |
652 | ||
3b2f2976 XL |
653 | // check for the #[rustc_error] annotation, which forces an |
654 | // error in trans. This is used to write compile-fail tests | |
655 | // that actually test that compilation succeeds without | |
656 | // reporting an error. | |
657 | fn check_for_rustc_errors_attr(tcx: TyCtxt) { | |
658 | if let Some((id, span)) = *tcx.sess.entry_fn.borrow() { | |
659 | let main_def_id = tcx.hir.local_def_id(id); | |
660 | ||
661 | if tcx.has_attr(main_def_id, "rustc_error") { | |
662 | tcx.sess.span_fatal(span, "compilation successful"); | |
663 | } | |
664 | } | |
665 | } | |
666 | ||
667 | /// Create the `main` function which will initialize the rust runtime and call | |
cc61c64b | 668 | /// users main function. |
3b2f2976 | 669 | fn maybe_create_entry_wrapper(ccx: &CrateContext) { |
5bcae85e SL |
670 | let (main_def_id, span) = match *ccx.sess().entry_fn.borrow() { |
671 | Some((id, span)) => { | |
32a655c1 | 672 | (ccx.tcx().hir.local_def_id(id), span) |
1a4d82fc | 673 | } |
5bcae85e SL |
674 | None => return, |
675 | }; | |
54a0048b | 676 | |
cc61c64b | 677 | let instance = Instance::mono(ccx.tcx(), main_def_id); |
5bcae85e SL |
678 | |
679 | if !ccx.codegen_unit().contains_item(&TransItem::Fn(instance)) { | |
680 | // We want to create the wrapper in the same codegen unit as Rust's main | |
681 | // function. | |
682 | return; | |
1a4d82fc | 683 | } |
1a4d82fc | 684 | |
cc61c64b | 685 | let main_llfn = callee::get_fn(ccx, instance); |
5bcae85e | 686 | |
1a4d82fc JJ |
687 | let et = ccx.sess().entry_type.get().unwrap(); |
688 | match et { | |
32a655c1 | 689 | config::EntryMain => create_entry_fn(ccx, span, main_llfn, true), |
5bcae85e | 690 | config::EntryStart => create_entry_fn(ccx, span, main_llfn, false), |
1a4d82fc JJ |
691 | config::EntryNone => {} // Do nothing. |
692 | } | |
693 | ||
694 | fn create_entry_fn(ccx: &CrateContext, | |
9346a6ac | 695 | sp: Span, |
1a4d82fc JJ |
696 | rust_main: ValueRef, |
697 | use_start_lang_item: bool) { | |
92a42be0 | 698 | let llfty = Type::func(&[ccx.int_type(), Type::i8p(ccx).ptr_to()], &ccx.int_type()); |
1a4d82fc | 699 | |
54a0048b | 700 | if declare::get_defined_value(ccx, "main").is_some() { |
9346a6ac | 701 | // FIXME: We should be smart and show a better diagnostic here. |
9cc50fc6 SL |
702 | ccx.sess().struct_span_err(sp, "entry symbol `main` defined multiple times") |
703 | .help("did you use #[no_mangle] on `fn main`? Use #[start] instead") | |
704 | .emit(); | |
9346a6ac | 705 | ccx.sess().abort_if_errors(); |
54a0048b SL |
706 | bug!(); |
707 | } | |
708 | let llfn = declare::declare_cfn(ccx, "main", llfty); | |
1a4d82fc | 709 | |
c30ab7b3 SL |
710 | // `main` should respect same config for frame pointer elimination as rest of code |
711 | attributes::set_frame_pointer_elimination(ccx, llfn); | |
712 | ||
32a655c1 | 713 | let bld = Builder::new_block(ccx, llfn, "top"); |
1a4d82fc | 714 | |
32a655c1 | 715 | debuginfo::gdb::insert_reference_to_gdb_debug_scripts_section_global(ccx, &bld); |
1a4d82fc | 716 | |
32a655c1 SL |
717 | let (start_fn, args) = if use_start_lang_item { |
718 | let start_def_id = ccx.tcx().require_lang_item(StartFnLangItem); | |
cc61c64b XL |
719 | let start_instance = Instance::mono(ccx.tcx(), start_def_id); |
720 | let start_fn = callee::get_fn(ccx, start_instance); | |
32a655c1 SL |
721 | (start_fn, vec![bld.pointercast(rust_main, Type::i8p(ccx).ptr_to()), get_param(llfn, 0), |
722 | get_param(llfn, 1)]) | |
723 | } else { | |
724 | debug!("using user-defined start fn"); | |
725 | (rust_main, vec![get_param(llfn, 0 as c_uint), get_param(llfn, 1 as c_uint)]) | |
726 | }; | |
1a4d82fc | 727 | |
32a655c1 SL |
728 | let result = bld.call(start_fn, &args, None); |
729 | bld.ret(result); | |
1a4d82fc JJ |
730 | } |
731 | } | |
732 | ||
54a0048b SL |
733 | fn contains_null(s: &str) -> bool { |
734 | s.bytes().any(|b| b == 0) | |
1a4d82fc JJ |
735 | } |
736 | ||
cc61c64b XL |
737 | fn write_metadata<'a, 'gcx>(tcx: TyCtxt<'a, 'gcx, 'gcx>, |
738 | link_meta: &LinkMeta, | |
739 | exported_symbols: &NodeSet) | |
3b2f2976 XL |
740 | -> (ContextRef, ModuleRef, |
741 | EncodedMetadata, EncodedMetadataHashes) { | |
041b39d2 XL |
742 | use std::io::Write; |
743 | use flate2::Compression; | |
744 | use flate2::write::DeflateEncoder; | |
1a4d82fc | 745 | |
cc61c64b XL |
746 | let (metadata_llcx, metadata_llmod) = unsafe { |
747 | context::create_context_and_module(tcx.sess, "metadata") | |
748 | }; | |
749 | ||
c30ab7b3 SL |
750 | #[derive(PartialEq, Eq, PartialOrd, Ord)] |
751 | enum MetadataKind { | |
752 | None, | |
753 | Uncompressed, | |
754 | Compressed | |
755 | } | |
756 | ||
cc61c64b | 757 | let kind = tcx.sess.crate_types.borrow().iter().map(|ty| { |
c30ab7b3 SL |
758 | match *ty { |
759 | config::CrateTypeExecutable | | |
760 | config::CrateTypeStaticlib | | |
761 | config::CrateTypeCdylib => MetadataKind::None, | |
762 | ||
32a655c1 | 763 | config::CrateTypeRlib => MetadataKind::Uncompressed, |
c30ab7b3 SL |
764 | |
765 | config::CrateTypeDylib | | |
766 | config::CrateTypeProcMacro => MetadataKind::Compressed, | |
767 | } | |
768 | }).max().unwrap(); | |
769 | ||
770 | if kind == MetadataKind::None { | |
3b2f2976 XL |
771 | return (metadata_llcx, |
772 | metadata_llmod, | |
773 | EncodedMetadata::new(), | |
774 | EncodedMetadataHashes::new()); | |
1a4d82fc JJ |
775 | } |
776 | ||
cc61c64b | 777 | let cstore = &tcx.sess.cstore; |
3b2f2976 XL |
778 | let (metadata, hashes) = cstore.encode_metadata(tcx, |
779 | &link_meta, | |
780 | exported_symbols); | |
c30ab7b3 | 781 | if kind == MetadataKind::Uncompressed { |
3b2f2976 | 782 | return (metadata_llcx, metadata_llmod, metadata, hashes); |
c30ab7b3 SL |
783 | } |
784 | ||
785 | assert!(kind == MetadataKind::Compressed); | |
92a42be0 | 786 | let mut compressed = cstore.metadata_encoding_version().to_vec(); |
041b39d2 XL |
787 | DeflateEncoder::new(&mut compressed, Compression::Fast) |
788 | .write_all(&metadata.raw_data).unwrap(); | |
1a4d82fc | 789 | |
cc61c64b XL |
790 | let llmeta = C_bytes_in_context(metadata_llcx, &compressed); |
791 | let llconst = C_struct_in_context(metadata_llcx, &[llmeta], false); | |
792 | let name = symbol_export::metadata_symbol_name(tcx); | |
85aaf69f | 793 | let buf = CString::new(name).unwrap(); |
1a4d82fc | 794 | let llglobal = unsafe { |
cc61c64b | 795 | llvm::LLVMAddGlobal(metadata_llmod, val_ty(llconst).to_ref(), buf.as_ptr()) |
1a4d82fc JJ |
796 | }; |
797 | unsafe { | |
798 | llvm::LLVMSetInitializer(llglobal, llconst); | |
7cac9316 | 799 | let section_name = metadata::metadata_section_name(&tcx.sess.target.target); |
5bcae85e SL |
800 | let name = CString::new(section_name).unwrap(); |
801 | llvm::LLVMSetSection(llglobal, name.as_ptr()); | |
802 | ||
803 | // Also generate a .section directive to force no | |
804 | // flags, at least for ELF outputs, so that the | |
805 | // metadata doesn't get loaded into memory. | |
806 | let directive = format!(".section {}", section_name); | |
807 | let directive = CString::new(directive).unwrap(); | |
cc61c64b | 808 | llvm::LLVMSetModuleInlineAsm(metadata_llmod, directive.as_ptr()) |
1a4d82fc | 809 | } |
3b2f2976 | 810 | return (metadata_llcx, metadata_llmod, metadata, hashes); |
e9174d1e SL |
811 | } |
812 | ||
813 | // Create a `__imp_<symbol> = &symbol` global for every public static `symbol`. | |
814 | // This is required to satisfy `dllimport` references to static data in .rlibs | |
815 | // when using MSVC linker. We do this only for data, as linker can fix up | |
816 | // code references on its own. | |
817 | // See #26591, #27438 | |
cc61c64b | 818 | fn create_imps(sess: &Session, |
3b2f2976 | 819 | llvm_module: &ModuleLlvm) { |
e9174d1e SL |
820 | // The x86 ABI seems to require that leading underscores are added to symbol |
821 | // names, so we need an extra underscore on 32-bit. There's also a leading | |
822 | // '\x01' here which disables LLVM's symbol mangling (e.g. no extra | |
823 | // underscores added in front). | |
cc61c64b | 824 | let prefix = if sess.target.target.target_pointer_width == "32" { |
e9174d1e SL |
825 | "\x01__imp__" |
826 | } else { | |
827 | "\x01__imp_" | |
828 | }; | |
829 | unsafe { | |
3b2f2976 XL |
830 | let exported: Vec<_> = iter_globals(llvm_module.llmod) |
831 | .filter(|&val| { | |
832 | llvm::LLVMRustGetLinkage(val) == | |
833 | llvm::Linkage::ExternalLinkage && | |
834 | llvm::LLVMIsDeclaration(val) == 0 | |
835 | }) | |
836 | .collect(); | |
837 | ||
838 | let i8p_ty = Type::i8p_llcx(llvm_module.llcx); | |
839 | for val in exported { | |
840 | let name = CStr::from_ptr(llvm::LLVMGetValueName(val)); | |
841 | let mut imp_name = prefix.as_bytes().to_vec(); | |
842 | imp_name.extend(name.to_bytes()); | |
843 | let imp_name = CString::new(imp_name).unwrap(); | |
844 | let imp = llvm::LLVMAddGlobal(llvm_module.llmod, | |
845 | i8p_ty.to_ref(), | |
846 | imp_name.as_ptr() as *const _); | |
847 | llvm::LLVMSetInitializer(imp, consts::ptrcast(val, i8p_ty)); | |
848 | llvm::LLVMRustSetLinkage(imp, llvm::Linkage::ExternalLinkage); | |
e9174d1e SL |
849 | } |
850 | } | |
851 | } | |
1a4d82fc | 852 | |
e9174d1e SL |
853 | struct ValueIter { |
854 | cur: ValueRef, | |
855 | step: unsafe extern "C" fn(ValueRef) -> ValueRef, | |
856 | } | |
857 | ||
858 | impl Iterator for ValueIter { | |
859 | type Item = ValueRef; | |
1a4d82fc | 860 | |
e9174d1e SL |
861 | fn next(&mut self) -> Option<ValueRef> { |
862 | let old = self.cur; | |
863 | if !old.is_null() { | |
b039eaaf | 864 | self.cur = unsafe { (self.step)(old) }; |
e9174d1e SL |
865 | Some(old) |
866 | } else { | |
867 | None | |
868 | } | |
1a4d82fc | 869 | } |
e9174d1e | 870 | } |
1a4d82fc | 871 | |
e9174d1e SL |
872 | fn iter_globals(llmod: llvm::ModuleRef) -> ValueIter { |
873 | unsafe { | |
874 | ValueIter { | |
875 | cur: llvm::LLVMGetFirstGlobal(llmod), | |
876 | step: llvm::LLVMGetNextGlobal, | |
877 | } | |
878 | } | |
879 | } | |
1a4d82fc | 880 | |
e9174d1e SL |
881 | /// The context provided lists a set of reachable ids as calculated by |
882 | /// middle::reachable, but this contains far more ids and symbols than we're | |
883 | /// actually exposing from the object file. This function will filter the set in | |
884 | /// the context to the set of ids which correspond to symbols that are exposed | |
885 | /// from the object file being generated. | |
886 | /// | |
887 | /// This list is later used by linkers to determine the set of symbols needed to | |
888 | /// be exposed from a dynamic library and it's also encoded into the metadata. | |
cc61c64b XL |
889 | pub fn find_exported_symbols(tcx: TyCtxt, reachable: &NodeSet) -> NodeSet { |
890 | reachable.iter().cloned().filter(|&id| { | |
e9174d1e SL |
891 | // Next, we want to ignore some FFI functions that are not exposed from |
892 | // this crate. Reachable FFI functions can be lumped into two | |
893 | // categories: | |
894 | // | |
895 | // 1. Those that are included statically via a static library | |
896 | // 2. Those included otherwise (e.g. dynamically or via a framework) | |
897 | // | |
898 | // Although our LLVM module is not literally emitting code for the | |
899 | // statically included symbols, it's an export of our library which | |
900 | // needs to be passed on to the linker and encoded in the metadata. | |
901 | // | |
902 | // As a result, if this id is an FFI item (foreign item) then we only | |
903 | // let it through if it's included statically. | |
32a655c1 | 904 | match tcx.hir.get(id) { |
e9174d1e | 905 | hir_map::NodeForeignItem(..) => { |
32a655c1 | 906 | let def_id = tcx.hir.local_def_id(id); |
476ff2be | 907 | tcx.sess.cstore.is_statically_included_foreign_item(def_id) |
e9174d1e | 908 | } |
3157f602 XL |
909 | |
910 | // Only consider nodes that actually have exported symbols. | |
911 | hir_map::NodeItem(&hir::Item { | |
912 | node: hir::ItemStatic(..), .. }) | | |
913 | hir_map::NodeItem(&hir::Item { | |
914 | node: hir::ItemFn(..), .. }) | | |
915 | hir_map::NodeImplItem(&hir::ImplItem { | |
916 | node: hir::ImplItemKind::Method(..), .. }) => { | |
32a655c1 | 917 | let def_id = tcx.hir.local_def_id(id); |
7cac9316 | 918 | let generics = tcx.generics_of(def_id); |
9e0c209e SL |
919 | let attributes = tcx.get_attrs(def_id); |
920 | (generics.parent_types == 0 && generics.types.is_empty()) && | |
921 | // Functions marked with #[inline] are only ever translated | |
922 | // with "internal" linkage and are never exported. | |
cc61c64b | 923 | !attr::requests_inline(&attributes) |
3157f602 XL |
924 | } |
925 | ||
926 | _ => false | |
e9174d1e SL |
927 | } |
928 | }).collect() | |
929 | } | |
930 | ||
a7813a04 | 931 | pub fn trans_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, |
9e0c209e | 932 | analysis: ty::CrateAnalysis, |
3b2f2976 | 933 | incremental_hashes_map: IncrementalHashesMap, |
041b39d2 | 934 | output_filenames: &OutputFilenames) |
3b2f2976 XL |
935 | -> OngoingCrateTranslation { |
936 | check_for_rustc_errors_attr(tcx); | |
937 | ||
9cc50fc6 SL |
938 | // Be careful with this krate: obviously it gives access to the |
939 | // entire contents of the krate. So if you push any subtasks of | |
940 | // `TransCrate`, you need to be careful to register "reads" of the | |
941 | // particular items that will be processed. | |
32a655c1 | 942 | let krate = tcx.hir.krate(); |
cc61c64b | 943 | let ty::CrateAnalysis { reachable, .. } = analysis; |
8bb4bdeb | 944 | let check_overflow = tcx.sess.overflow_checks(); |
3b2f2976 XL |
945 | let link_meta = link::build_link_meta(&incremental_hashes_map); |
946 | let exported_symbol_node_ids = find_exported_symbols(tcx, &reachable); | |
c1a9b12d | 947 | |
a7813a04 | 948 | let shared_ccx = SharedCrateContext::new(tcx, |
041b39d2 XL |
949 | check_overflow, |
950 | output_filenames); | |
3157f602 | 951 | // Translate the metadata. |
3b2f2976 | 952 | let (metadata_llcx, metadata_llmod, metadata, metadata_incr_hashes) = |
cc61c64b | 953 | time(tcx.sess.time_passes(), "write metadata", || { |
3b2f2976 | 954 | write_metadata(tcx, &link_meta, &exported_symbol_node_ids) |
cc61c64b | 955 | }); |
3157f602 XL |
956 | |
957 | let metadata_module = ModuleTranslation { | |
8bb4bdeb | 958 | name: link::METADATA_MODULE_NAME.to_string(), |
5bcae85e SL |
959 | symbol_name_hash: 0, // we always rebuild metadata, at least for now |
960 | source: ModuleSource::Translated(ModuleLlvm { | |
cc61c64b XL |
961 | llcx: metadata_llcx, |
962 | llmod: metadata_llmod, | |
5bcae85e | 963 | }), |
3b2f2976 | 964 | kind: ModuleKind::Metadata, |
3157f602 | 965 | }; |
041b39d2 | 966 | |
3157f602 | 967 | let no_builtins = attr::contains_name(&krate.attrs, "no_builtins"); |
3b2f2976 XL |
968 | let time_graph = if tcx.sess.opts.debugging_opts.trans_time_graph { |
969 | Some(time_graph::TimeGraph::new()) | |
970 | } else { | |
971 | None | |
972 | }; | |
041b39d2 | 973 | |
32a655c1 SL |
974 | // Skip crate items and just output metadata in -Z no-trans mode. |
975 | if tcx.sess.opts.debugging_opts.no_trans || | |
976 | !tcx.sess.opts.output_types.should_trans() { | |
977 | let empty_exported_symbols = ExportedSymbols::empty(); | |
978 | let linker_info = LinkerInfo::new(&shared_ccx, &empty_exported_symbols); | |
3b2f2976 XL |
979 | let ongoing_translation = write::start_async_translation( |
980 | tcx.sess, | |
981 | output_filenames, | |
982 | time_graph.clone(), | |
983 | tcx.crate_name(LOCAL_CRATE), | |
984 | link_meta, | |
985 | metadata, | |
986 | Arc::new(empty_exported_symbols), | |
987 | no_builtins, | |
988 | None, | |
989 | linker_info, | |
990 | false); | |
991 | ||
992 | ongoing_translation.submit_pre_translated_module_to_llvm(tcx.sess, metadata_module, true); | |
993 | ||
994 | assert_and_save_dep_graph(tcx, | |
995 | incremental_hashes_map, | |
996 | metadata_incr_hashes, | |
997 | link_meta); | |
998 | ||
999 | ongoing_translation.check_for_errors(tcx.sess); | |
1000 | ||
1001 | return ongoing_translation; | |
32a655c1 SL |
1002 | } |
1003 | ||
3b2f2976 XL |
1004 | let exported_symbols = Arc::new(ExportedSymbols::compute(tcx, |
1005 | &exported_symbol_node_ids)); | |
1006 | ||
5bcae85e SL |
1007 | // Run the translation item collector and partition the collected items into |
1008 | // codegen units. | |
7cac9316 | 1009 | let (translation_items, codegen_units) = |
3b2f2976 XL |
1010 | collect_and_partition_translation_items(&shared_ccx, &exported_symbols); |
1011 | ||
1012 | assert!(codegen_units.len() <= 1 || !tcx.sess.lto()); | |
1013 | ||
1014 | let linker_info = LinkerInfo::new(&shared_ccx, &exported_symbols); | |
1015 | let subsystem = attr::first_attr_value_str_by_name(&krate.attrs, | |
1016 | "windows_subsystem"); | |
1017 | let windows_subsystem = subsystem.map(|subsystem| { | |
1018 | if subsystem != "windows" && subsystem != "console" { | |
1019 | tcx.sess.fatal(&format!("invalid windows subsystem `{}`, only \ | |
1020 | `windows` and `console` are allowed", | |
1021 | subsystem)); | |
1022 | } | |
1023 | subsystem.to_string() | |
1024 | }); | |
1025 | ||
1026 | let no_integrated_as = tcx.sess.opts.cg.no_integrated_as || | |
1027 | (tcx.sess.target.target.options.no_integrated_as && | |
1028 | (output_filenames.outputs.contains_key(&OutputType::Object) || | |
1029 | output_filenames.outputs.contains_key(&OutputType::Exe))); | |
1030 | ||
1031 | let ongoing_translation = write::start_async_translation( | |
1032 | tcx.sess, | |
1033 | output_filenames, | |
1034 | time_graph.clone(), | |
1035 | tcx.crate_name(LOCAL_CRATE), | |
1036 | link_meta, | |
1037 | metadata, | |
1038 | exported_symbols.clone(), | |
1039 | no_builtins, | |
1040 | windows_subsystem, | |
1041 | linker_info, | |
1042 | no_integrated_as); | |
1043 | ||
1044 | // Translate an allocator shim, if any | |
1045 | // | |
1046 | // If LTO is enabled and we've got some previous LLVM module we translated | |
1047 | // above, then we can just translate directly into that LLVM module. If not, | |
1048 | // however, we need to create a separate module and trans into that. Note | |
1049 | // that the separate translation is critical for the standard library where | |
1050 | // the rlib's object file doesn't have allocator functions but the dylib | |
1051 | // links in an object file that has allocator functions. When we're | |
1052 | // compiling a final LTO artifact, though, there's no need to worry about | |
1053 | // this as we're not working with this dual "rlib/dylib" functionality. | |
1054 | let allocator_module = if tcx.sess.lto() { | |
1055 | None | |
1056 | } else if let Some(kind) = tcx.sess.allocator_kind.get() { | |
1057 | unsafe { | |
1058 | let (llcx, llmod) = | |
1059 | context::create_context_and_module(tcx.sess, "allocator"); | |
1060 | let modules = ModuleLlvm { | |
1061 | llmod, | |
1062 | llcx, | |
1063 | }; | |
1064 | time(tcx.sess.time_passes(), "write allocator module", || { | |
1065 | allocator::trans(tcx, &modules, kind) | |
1066 | }); | |
1067 | ||
1068 | Some(ModuleTranslation { | |
1069 | name: link::ALLOCATOR_MODULE_NAME.to_string(), | |
1070 | symbol_name_hash: 0, // we always rebuild allocator shims | |
1071 | source: ModuleSource::Translated(modules), | |
1072 | kind: ModuleKind::Allocator, | |
1073 | }) | |
1074 | } | |
1075 | } else { | |
1076 | None | |
1077 | }; | |
1078 | ||
1079 | if let Some(allocator_module) = allocator_module { | |
1080 | ongoing_translation.submit_pre_translated_module_to_llvm(tcx.sess, allocator_module, false); | |
1081 | } | |
1082 | ||
1083 | let codegen_unit_count = codegen_units.len(); | |
1084 | ongoing_translation.submit_pre_translated_module_to_llvm(tcx.sess, | |
1085 | metadata_module, | |
1086 | codegen_unit_count == 0); | |
1087 | ||
1088 | let translation_items = Arc::new(translation_items); | |
a7813a04 | 1089 | |
cc61c64b | 1090 | let mut all_stats = Stats::default(); |
3b2f2976 XL |
1091 | let mut module_dispositions = tcx.sess.opts.incremental.as_ref().map(|_| Vec::new()); |
1092 | ||
1093 | // We sort the codegen units by size. This way we can schedule work for LLVM | |
1094 | // a bit more efficiently. Note that "size" is defined rather crudely at the | |
1095 | // moment as it is just the number of TransItems in the CGU, not taking into | |
1096 | // account the size of each TransItem. | |
1097 | let codegen_units = { | |
1098 | let mut codegen_units = codegen_units; | |
1099 | codegen_units.sort_by_key(|cgu| -(cgu.items().len() as isize)); | |
1100 | codegen_units | |
1101 | }; | |
1102 | ||
1103 | let mut total_trans_time = Duration::new(0, 0); | |
1104 | ||
1105 | for (cgu_index, cgu) in codegen_units.into_iter().enumerate() { | |
1106 | ongoing_translation.wait_for_signal_to_translate_item(); | |
1107 | ongoing_translation.check_for_errors(tcx.sess); | |
1108 | ||
1109 | let start_time = Instant::now(); | |
1110 | ||
1111 | let module = { | |
1112 | let _timing_guard = time_graph | |
1113 | .as_ref() | |
1114 | .map(|time_graph| time_graph.start(write::TRANS_WORKER_TIMELINE, | |
1115 | write::TRANS_WORK_PACKAGE_KIND)); | |
cc61c64b | 1116 | let dep_node = cgu.work_product_dep_node(); |
041b39d2 | 1117 | let ((stats, module), _) = |
cc61c64b XL |
1118 | tcx.dep_graph.with_task(dep_node, |
1119 | AssertDepGraphSafe(&shared_ccx), | |
3b2f2976 XL |
1120 | AssertDepGraphSafe((cgu, |
1121 | translation_items.clone(), | |
1122 | exported_symbols.clone())), | |
cc61c64b XL |
1123 | module_translation); |
1124 | all_stats.extend(stats); | |
3b2f2976 XL |
1125 | |
1126 | if let Some(ref mut module_dispositions) = module_dispositions { | |
1127 | module_dispositions.push(module.disposition()); | |
1128 | } | |
1129 | ||
cc61c64b | 1130 | module |
3b2f2976 XL |
1131 | }; |
1132 | ||
1133 | let time_to_translate = Instant::now().duration_since(start_time); | |
1134 | ||
1135 | // We assume that the cost to run LLVM on a CGU is proportional to | |
1136 | // the time we needed for translating it. | |
1137 | let cost = time_to_translate.as_secs() * 1_000_000_000 + | |
1138 | time_to_translate.subsec_nanos() as u64; | |
1139 | ||
1140 | total_trans_time += time_to_translate; | |
1141 | ||
1142 | let is_last_cgu = (cgu_index + 1) == codegen_unit_count; | |
1143 | ||
1144 | ongoing_translation.submit_translated_module_to_llvm(tcx.sess, | |
1145 | module, | |
1146 | cost, | |
1147 | is_last_cgu); | |
1148 | ongoing_translation.check_for_errors(tcx.sess); | |
1149 | } | |
1150 | ||
1151 | // Since the main thread is sometimes blocked during trans, we keep track | |
1152 | // -Ztime-passes output manually. | |
1153 | print_time_passes_entry(tcx.sess.time_passes(), | |
1154 | "translate to LLVM IR", | |
1155 | total_trans_time); | |
1156 | ||
1157 | if let Some(module_dispositions) = module_dispositions { | |
1158 | assert_module_sources::assert_module_sources(tcx, &module_dispositions); | |
1159 | } | |
3157f602 | 1160 | |
cc61c64b XL |
1161 | fn module_translation<'a, 'tcx>( |
1162 | scx: AssertDepGraphSafe<&SharedCrateContext<'a, 'tcx>>, | |
3b2f2976 XL |
1163 | args: AssertDepGraphSafe<(CodegenUnit<'tcx>, |
1164 | Arc<FxHashSet<TransItem<'tcx>>>, | |
1165 | Arc<ExportedSymbols>)>) | |
cc61c64b XL |
1166 | -> (Stats, ModuleTranslation) |
1167 | { | |
1168 | // FIXME(#40304): We ought to be using the id as a key and some queries, I think. | |
1169 | let AssertDepGraphSafe(scx) = scx; | |
3b2f2976 | 1170 | let AssertDepGraphSafe((cgu, crate_trans_items, exported_symbols)) = args; |
cc61c64b XL |
1171 | |
1172 | let cgu_name = String::from(cgu.name()); | |
1173 | let cgu_id = cgu.work_product_id(); | |
7cac9316 | 1174 | let symbol_name_hash = cgu.compute_symbol_name_hash(scx); |
cc61c64b XL |
1175 | |
1176 | // Check whether there is a previous work-product we can | |
1177 | // re-use. Not only must the file exist, and the inputs not | |
1178 | // be dirty, but the hash of the symbols we will generate must | |
1179 | // be the same. | |
1180 | let previous_work_product = | |
1181 | scx.dep_graph().previous_work_product(&cgu_id).and_then(|work_product| { | |
1182 | if work_product.input_hash == symbol_name_hash { | |
1183 | debug!("trans_reuse_previous_work_products: reusing {:?}", work_product); | |
1184 | Some(work_product) | |
1185 | } else { | |
1186 | if scx.sess().opts.debugging_opts.incremental_info { | |
041b39d2 XL |
1187 | eprintln!("incremental: CGU `{}` invalidated because of \ |
1188 | changed partitioning hash.", | |
1189 | cgu.name()); | |
cc61c64b XL |
1190 | } |
1191 | debug!("trans_reuse_previous_work_products: \ | |
1192 | not reusing {:?} because hash changed to {:?}", | |
1193 | work_product, symbol_name_hash); | |
1194 | None | |
1195 | } | |
1196 | }); | |
5bcae85e | 1197 | |
cc61c64b XL |
1198 | if let Some(buf) = previous_work_product { |
1199 | // Don't need to translate this module. | |
1200 | let module = ModuleTranslation { | |
1201 | name: cgu_name, | |
1202 | symbol_name_hash, | |
3b2f2976 XL |
1203 | source: ModuleSource::Preexisting(buf.clone()), |
1204 | kind: ModuleKind::Regular, | |
cc61c64b XL |
1205 | }; |
1206 | return (Stats::default(), module); | |
1207 | } | |
1208 | ||
1209 | // Instantiate translation items without filling out definitions yet... | |
3b2f2976 | 1210 | let lcx = LocalCrateContext::new(scx, cgu, crate_trans_items, exported_symbols); |
cc61c64b XL |
1211 | let module = { |
1212 | let ccx = CrateContext::new(scx, &lcx); | |
1213 | let trans_items = ccx.codegen_unit() | |
7cac9316 | 1214 | .items_in_deterministic_order(ccx.tcx()); |
3b2f2976 XL |
1215 | for &(trans_item, (linkage, visibility)) in &trans_items { |
1216 | trans_item.predefine(&ccx, linkage, visibility); | |
5bcae85e | 1217 | } |
7453a54e | 1218 | |
cc61c64b XL |
1219 | // ... and now that we have everything pre-defined, fill out those definitions. |
1220 | for &(trans_item, _) in &trans_items { | |
5bcae85e SL |
1221 | trans_item.define(&ccx); |
1222 | } | |
54a0048b | 1223 | |
5bcae85e SL |
1224 | // If this codegen unit contains the main function, also create the |
1225 | // wrapper here | |
1226 | maybe_create_entry_wrapper(&ccx); | |
1a4d82fc | 1227 | |
5bcae85e SL |
1228 | // Run replace-all-uses-with for statics that need it |
1229 | for &(old_g, new_g) in ccx.statics_to_rauw().borrow().iter() { | |
1230 | unsafe { | |
1231 | let bitcast = llvm::LLVMConstPointerCast(new_g, llvm::LLVMTypeOf(old_g)); | |
1232 | llvm::LLVMReplaceAllUsesWith(old_g, bitcast); | |
1233 | llvm::LLVMDeleteGlobal(old_g); | |
1234 | } | |
c1a9b12d | 1235 | } |
5bcae85e | 1236 | |
cc61c64b XL |
1237 | // Create the llvm.used variable |
1238 | // This variable has type [N x i8*] and is stored in the llvm.metadata section | |
1239 | if !ccx.used_statics().borrow().is_empty() { | |
1240 | let name = CString::new("llvm.used").unwrap(); | |
1241 | let section = CString::new("llvm.metadata").unwrap(); | |
1242 | let array = C_array(Type::i8(&ccx).ptr_to(), &*ccx.used_statics().borrow()); | |
1243 | ||
1244 | unsafe { | |
1245 | let g = llvm::LLVMAddGlobal(ccx.llmod(), | |
1246 | val_ty(array).to_ref(), | |
1247 | name.as_ptr()); | |
1248 | llvm::LLVMSetInitializer(g, array); | |
1249 | llvm::LLVMRustSetLinkage(g, llvm::Linkage::AppendingLinkage); | |
1250 | llvm::LLVMSetSection(g, section.as_ptr()); | |
1251 | } | |
1252 | } | |
1253 | ||
5bcae85e SL |
1254 | // Finalize debuginfo |
1255 | if ccx.sess().opts.debuginfo != NoDebugInfo { | |
1256 | debuginfo::finalize(&ccx); | |
1257 | } | |
cc61c64b | 1258 | |
3b2f2976 XL |
1259 | let llvm_module = ModuleLlvm { |
1260 | llcx: ccx.llcx(), | |
1261 | llmod: ccx.llmod(), | |
1262 | }; | |
1263 | ||
1264 | // In LTO mode we inject the allocator shim into the existing | |
1265 | // module. | |
1266 | if ccx.sess().lto() { | |
1267 | if let Some(kind) = ccx.sess().allocator_kind.get() { | |
1268 | time(ccx.sess().time_passes(), "write allocator module", || { | |
1269 | unsafe { | |
1270 | allocator::trans(ccx.tcx(), &llvm_module, kind); | |
1271 | } | |
1272 | }); | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | // Adjust exported symbols for MSVC dllimport | |
1277 | if ccx.sess().target.target.options.is_like_msvc && | |
1278 | ccx.sess().crate_types.borrow().iter().any(|ct| *ct == config::CrateTypeRlib) { | |
1279 | create_imps(ccx.sess(), &llvm_module); | |
1280 | } | |
1281 | ||
cc61c64b XL |
1282 | ModuleTranslation { |
1283 | name: cgu_name, | |
1284 | symbol_name_hash, | |
3b2f2976 XL |
1285 | source: ModuleSource::Translated(llvm_module), |
1286 | kind: ModuleKind::Regular, | |
cc61c64b XL |
1287 | } |
1288 | }; | |
1289 | ||
1290 | (lcx.into_stats(), module) | |
1a4d82fc JJ |
1291 | } |
1292 | ||
cc61c64b | 1293 | symbol_names_test::report_symbol_names(tcx); |
5bcae85e | 1294 | |
1a4d82fc | 1295 | if shared_ccx.sess().trans_stats() { |
1a4d82fc | 1296 | println!("--- trans stats ---"); |
cc61c64b XL |
1297 | println!("n_glues_created: {}", all_stats.n_glues_created.get()); |
1298 | println!("n_null_glues: {}", all_stats.n_null_glues.get()); | |
1299 | println!("n_real_glues: {}", all_stats.n_real_glues.get()); | |
1a4d82fc | 1300 | |
cc61c64b XL |
1301 | println!("n_fns: {}", all_stats.n_fns.get()); |
1302 | println!("n_inlines: {}", all_stats.n_inlines.get()); | |
1303 | println!("n_closures: {}", all_stats.n_closures.get()); | |
1a4d82fc | 1304 | println!("fn stats:"); |
cc61c64b | 1305 | all_stats.fn_stats.borrow_mut().sort_by(|&(_, insns_a), &(_, insns_b)| { |
1a4d82fc JJ |
1306 | insns_b.cmp(&insns_a) |
1307 | }); | |
cc61c64b | 1308 | for tuple in all_stats.fn_stats.borrow().iter() { |
1a4d82fc JJ |
1309 | match *tuple { |
1310 | (ref name, insns) => { | |
1311 | println!("{} insns, {}", insns, *name); | |
1312 | } | |
1313 | } | |
1314 | } | |
1315 | } | |
5bcae85e | 1316 | |
1a4d82fc | 1317 | if shared_ccx.sess().count_llvm_insns() { |
cc61c64b | 1318 | for (k, v) in all_stats.llvm_insns.borrow().iter() { |
1a4d82fc JJ |
1319 | println!("{:7} {}", *v, *k); |
1320 | } | |
1321 | } | |
1322 | ||
3b2f2976 | 1323 | ongoing_translation.check_for_errors(tcx.sess); |
041b39d2 | 1324 | |
3b2f2976 XL |
1325 | assert_and_save_dep_graph(tcx, |
1326 | incremental_hashes_map, | |
1327 | metadata_incr_hashes, | |
1328 | link_meta); | |
1329 | ongoing_translation | |
1330 | } | |
c30ab7b3 | 1331 | |
3b2f2976 XL |
1332 | fn assert_and_save_dep_graph<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, |
1333 | incremental_hashes_map: IncrementalHashesMap, | |
1334 | metadata_incr_hashes: EncodedMetadataHashes, | |
1335 | link_meta: LinkMeta) { | |
1336 | time(tcx.sess.time_passes(), | |
1337 | "assert dep graph", | |
1338 | || rustc_incremental::assert_dep_graph(tcx)); | |
1339 | ||
1340 | time(tcx.sess.time_passes(), | |
1341 | "serialize dep graph", | |
1342 | || rustc_incremental::save_dep_graph(tcx, | |
1343 | incremental_hashes_map, | |
1344 | &metadata_incr_hashes, | |
1345 | link_meta.crate_hash)); | |
1a4d82fc | 1346 | } |
92a42be0 | 1347 | |
7cac9316 XL |
1348 | #[inline(never)] // give this a place in the profiler |
1349 | fn assert_symbols_are_distinct<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, trans_items: I) | |
1350 | where I: Iterator<Item=&'a TransItem<'tcx>> | |
1351 | { | |
1352 | let mut symbols: Vec<_> = trans_items.map(|trans_item| { | |
1353 | (trans_item, trans_item.symbol_name(tcx)) | |
1354 | }).collect(); | |
476ff2be | 1355 | |
7cac9316 XL |
1356 | (&mut symbols[..]).sort_by(|&(_, ref sym1), &(_, ref sym2)|{ |
1357 | sym1.cmp(sym2) | |
1358 | }); | |
476ff2be | 1359 | |
7cac9316 XL |
1360 | for pair in (&symbols[..]).windows(2) { |
1361 | let sym1 = &pair[0].1; | |
1362 | let sym2 = &pair[1].1; | |
476ff2be | 1363 | |
7cac9316 XL |
1364 | if *sym1 == *sym2 { |
1365 | let trans_item1 = pair[0].0; | |
1366 | let trans_item2 = pair[1].0; | |
476ff2be | 1367 | |
7cac9316 XL |
1368 | let span1 = trans_item1.local_span(tcx); |
1369 | let span2 = trans_item2.local_span(tcx); | |
476ff2be | 1370 | |
7cac9316 XL |
1371 | // Deterministically select one of the spans for error reporting |
1372 | let span = match (span1, span2) { | |
1373 | (Some(span1), Some(span2)) => { | |
1374 | Some(if span1.lo.0 > span2.lo.0 { | |
1375 | span1 | |
1376 | } else { | |
1377 | span2 | |
476ff2be | 1378 | }) |
7cac9316 XL |
1379 | } |
1380 | (Some(span), None) | | |
1381 | (None, Some(span)) => Some(span), | |
1382 | _ => None | |
1383 | }; | |
476ff2be | 1384 | |
7cac9316 | 1385 | let error_message = format!("symbol `{}` is already defined", sym1); |
476ff2be | 1386 | |
7cac9316 XL |
1387 | if let Some(span) = span { |
1388 | tcx.sess.span_fatal(span, &error_message) | |
1389 | } else { | |
1390 | tcx.sess.fatal(&error_message) | |
476ff2be SL |
1391 | } |
1392 | } | |
1393 | } | |
1394 | } | |
1395 | ||
3b2f2976 XL |
1396 | fn collect_and_partition_translation_items<'a, 'tcx>(scx: &SharedCrateContext<'a, 'tcx>, |
1397 | exported_symbols: &ExportedSymbols) | |
cc61c64b | 1398 | -> (FxHashSet<TransItem<'tcx>>, |
7cac9316 | 1399 | Vec<CodegenUnit<'tcx>>) { |
a7813a04 | 1400 | let time_passes = scx.sess().time_passes(); |
7453a54e | 1401 | |
a7813a04 | 1402 | let collection_mode = match scx.sess().opts.debugging_opts.print_trans_items { |
7453a54e SL |
1403 | Some(ref s) => { |
1404 | let mode_string = s.to_lowercase(); | |
1405 | let mode_string = mode_string.trim(); | |
1406 | if mode_string == "eager" { | |
1407 | TransItemCollectionMode::Eager | |
1408 | } else { | |
1409 | if mode_string != "lazy" { | |
1410 | let message = format!("Unknown codegen-item collection mode '{}'. \ | |
1411 | Falling back to 'lazy' mode.", | |
1412 | mode_string); | |
a7813a04 | 1413 | scx.sess().warn(&message); |
7453a54e SL |
1414 | } |
1415 | ||
1416 | TransItemCollectionMode::Lazy | |
1417 | } | |
1418 | } | |
1419 | None => TransItemCollectionMode::Lazy | |
1420 | }; | |
1421 | ||
5bcae85e SL |
1422 | let (items, inlining_map) = |
1423 | time(time_passes, "translation item collection", || { | |
3b2f2976 XL |
1424 | collector::collect_crate_translation_items(&scx, |
1425 | exported_symbols, | |
1426 | collection_mode) | |
7453a54e SL |
1427 | }); |
1428 | ||
7cac9316 | 1429 | assert_symbols_are_distinct(scx.tcx(), items.iter()); |
5bcae85e | 1430 | |
a7813a04 XL |
1431 | let strategy = if scx.sess().opts.debugging_opts.incremental.is_some() { |
1432 | PartitioningStrategy::PerModule | |
1433 | } else { | |
1434 | PartitioningStrategy::FixedUnitCount(scx.sess().opts.cg.codegen_units) | |
1435 | }; | |
1436 | ||
1437 | let codegen_units = time(time_passes, "codegen unit partitioning", || { | |
9e0c209e | 1438 | partitioning::partition(scx, |
a7813a04 XL |
1439 | items.iter().cloned(), |
1440 | strategy, | |
3b2f2976 XL |
1441 | &inlining_map, |
1442 | exported_symbols) | |
a7813a04 XL |
1443 | }); |
1444 | ||
5bcae85e SL |
1445 | assert!(scx.tcx().sess.opts.cg.codegen_units == codegen_units.len() || |
1446 | scx.tcx().sess.opts.debugging_opts.incremental.is_some()); | |
1447 | ||
cc61c64b | 1448 | let translation_items: FxHashSet<TransItem<'tcx>> = items.iter().cloned().collect(); |
5bcae85e | 1449 | |
a7813a04 | 1450 | if scx.sess().opts.debugging_opts.print_trans_items.is_some() { |
476ff2be | 1451 | let mut item_to_cgus = FxHashMap(); |
a7813a04 XL |
1452 | |
1453 | for cgu in &codegen_units { | |
5bcae85e | 1454 | for (&trans_item, &linkage) in cgu.items() { |
a7813a04 XL |
1455 | item_to_cgus.entry(trans_item) |
1456 | .or_insert(Vec::new()) | |
5bcae85e | 1457 | .push((cgu.name().clone(), linkage)); |
a7813a04 XL |
1458 | } |
1459 | } | |
1460 | ||
1461 | let mut item_keys: Vec<_> = items | |
1462 | .iter() | |
1463 | .map(|i| { | |
1464 | let mut output = i.to_string(scx.tcx()); | |
1465 | output.push_str(" @@"); | |
1466 | let mut empty = Vec::new(); | |
3b2f2976 | 1467 | let cgus = item_to_cgus.get_mut(i).unwrap_or(&mut empty); |
a7813a04 XL |
1468 | cgus.as_mut_slice().sort_by_key(|&(ref name, _)| name.clone()); |
1469 | cgus.dedup(); | |
3b2f2976 | 1470 | for &(ref cgu_name, (linkage, _)) in cgus.iter() { |
a7813a04 | 1471 | output.push_str(" "); |
cc61c64b | 1472 | output.push_str(&cgu_name); |
a7813a04 XL |
1473 | |
1474 | let linkage_abbrev = match linkage { | |
9e0c209e SL |
1475 | llvm::Linkage::ExternalLinkage => "External", |
1476 | llvm::Linkage::AvailableExternallyLinkage => "Available", | |
1477 | llvm::Linkage::LinkOnceAnyLinkage => "OnceAny", | |
1478 | llvm::Linkage::LinkOnceODRLinkage => "OnceODR", | |
1479 | llvm::Linkage::WeakAnyLinkage => "WeakAny", | |
1480 | llvm::Linkage::WeakODRLinkage => "WeakODR", | |
1481 | llvm::Linkage::AppendingLinkage => "Appending", | |
1482 | llvm::Linkage::InternalLinkage => "Internal", | |
1483 | llvm::Linkage::PrivateLinkage => "Private", | |
1484 | llvm::Linkage::ExternalWeakLinkage => "ExternalWeak", | |
1485 | llvm::Linkage::CommonLinkage => "Common", | |
a7813a04 XL |
1486 | }; |
1487 | ||
1488 | output.push_str("["); | |
1489 | output.push_str(linkage_abbrev); | |
1490 | output.push_str("]"); | |
1491 | } | |
1492 | output | |
1493 | }) | |
1494 | .collect(); | |
1495 | ||
7453a54e SL |
1496 | item_keys.sort(); |
1497 | ||
1498 | for item in item_keys { | |
1499 | println!("TRANS_ITEM {}", item); | |
1500 | } | |
5bcae85e | 1501 | } |
7453a54e | 1502 | |
7cac9316 | 1503 | (translation_items, codegen_units) |
5bcae85e | 1504 | } |