1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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.
10
11
12 use back::abi;
13 use lib::llvm::llvm;
14 use lib::llvm::ValueRef;
15 use lib;
16 use metadata::csearch;
17 use middle::trans::base::*;
18 use middle::trans::build::*;
19 use middle::trans::callee::*;
20 use middle::trans::callee;
21 use middle::trans::cleanup;
22 use middle::trans::common::*;
23 use middle::trans::datum::*;
24 use middle::trans::expr::{SaveIn, Ignore};
25 use middle::trans::expr;
26 use middle::trans::glue;
27 use middle::trans::monomorphize;
28 use middle::trans::type_::Type;
29 use middle::trans::type_of::*;
30 use middle::ty;
31 use middle::typeck;
32 use middle::typeck::MethodCall;
33 use util::common::indenter;
34 use util::ppaux::Repr;
35
36 use std::c_str::ToCStr;
37 use syntax::abi::Rust;
38 use syntax::parse::token;
39 use syntax::{ast, ast_map, visit};
40
41 /**
42 The main "translation" pass for methods. Generates code
43 for non-monomorphized methods only. Other methods will
44 be generated once they are invoked with specific type parameters,
45 see `trans::base::lval_static_fn()` or `trans::base::monomorphic_fn()`.
46 */
47 pub fn trans_impl(ccx: &CrateContext,
48 name: ast::Ident,
49 methods: &[@ast::Method],
50 generics: &ast::Generics,
51 id: ast::NodeId) {
52 let _icx = push_ctxt("meth::trans_impl");
53 let tcx = ccx.tcx();
54
55 debug!("trans_impl(name={}, id={:?})", name.repr(tcx), id);
56
57 // Both here and below with generic methods, be sure to recurse and look for
58 // items that we need to translate.
59 if !generics.ty_params.is_empty() {
60 let mut v = TransItemVisitor{ ccx: ccx };
61 for method in methods.iter() {
62 visit::walk_method_helper(&mut v, *method, ());
63 }
64 return;
65 }
66 for method in methods.iter() {
67 if method.generics.ty_params.len() == 0u {
68 let llfn = get_item_val(ccx, method.id);
69 trans_fn(ccx, method.decl, method.body,
70 llfn, None, method.id, []);
71 } else {
72 let mut v = TransItemVisitor{ ccx: ccx };
73 visit::walk_method_helper(&mut v, *method, ());
74 }
75 }
76 }
77
78 pub fn trans_method_callee<'a>(
79 bcx: &'a Block<'a>,
80 method_call: MethodCall,
81 self_expr: Option<&ast::Expr>,
82 arg_cleanup_scope: cleanup::ScopeId)
83 -> Callee<'a> {
84 let _icx = push_ctxt("meth::trans_method_callee");
85
86 let (origin, method_ty) = match bcx.tcx().method_map
87 .borrow().find(&method_call) {
88 Some(method) => {
89 debug!("trans_method_callee({:?}, method={})",
90 method_call, method.repr(bcx.tcx()));
91 (method.origin, method.ty)
92 }
93 None => {
94 bcx.sess().span_bug(bcx.tcx().map.span(method_call.expr_id),
95 "method call expr wasn't in method map")
96 }
97 };
98
99 match origin {
100 typeck::MethodStatic(did) => {
101 Callee {
102 bcx: bcx,
103 data: Fn(callee::trans_fn_ref(bcx, did, MethodCall(method_call)))
104 }
105 }
106 typeck::MethodParam(typeck::MethodParam {
107 trait_id: trait_id,
108 method_num: off,
109 param_num: p,
110 bound_num: b
111 }) => {
112 match bcx.fcx.param_substs {
113 Some(substs) => {
114 ty::populate_implementations_for_trait_if_necessary(
115 bcx.tcx(),
116 trait_id);
117
118 let vtbl = find_vtable(bcx.tcx(), substs, p, b);
119 trans_monomorphized_callee(bcx, method_call,
120 trait_id, off, vtbl)
121 }
122 // how to get rid of this?
123 None => fail!("trans_method_callee: missing param_substs")
124 }
125 }
126
127 typeck::MethodObject(ref mt) => {
128 let self_expr = match self_expr {
129 Some(self_expr) => self_expr,
130 None => {
131 bcx.sess().span_bug(bcx.tcx().map.span(method_call.expr_id),
132 "self expr wasn't provided for trait object \
133 callee (trying to call overloaded op?)")
134 }
135 };
136 trans_trait_callee(bcx,
137 monomorphize_type(bcx, method_ty),
138 mt.real_index,
139 self_expr,
140 arg_cleanup_scope)
141 }
142 }
143 }
144
145 pub fn trans_static_method_callee(bcx: &Block,
146 method_id: ast::DefId,
147 trait_id: ast::DefId,
148 expr_id: ast::NodeId)
149 -> ValueRef {
150 let _icx = push_ctxt("meth::trans_static_method_callee");
151 let ccx = bcx.ccx();
152
153 debug!("trans_static_method_callee(method_id={:?}, trait_id={}, \
154 expr_id={:?})",
155 method_id,
156 ty::item_path_str(bcx.tcx(), trait_id),
157 expr_id);
158 let _indenter = indenter();
159
160 ty::populate_implementations_for_trait_if_necessary(bcx.tcx(), trait_id);
161
162 // When we translate a static fn defined in a trait like:
163 //
164 // trait<T1...Tn> Trait {
165 // fn foo<M1...Mn>(...) {...}
166 // }
167 //
168 // this winds up being translated as something like:
169 //
170 // fn foo<T1...Tn,self: Trait<T1...Tn>,M1...Mn>(...) {...}
171 //
172 // So when we see a call to this function foo, we have to figure
173 // out which impl the `Trait<T1...Tn>` bound on the type `self` was
174 // bound to.
175 let bound_index = ty::lookup_trait_def(bcx.tcx(), trait_id).
176 generics.type_param_defs().len();
177
178 let mname = if method_id.krate == ast::LOCAL_CRATE {
179 match bcx.tcx().map.get(method_id.node) {
180 ast_map::NodeTraitMethod(method) => {
181 let ident = match *method {
182 ast::Required(ref m) => m.ident,
183 ast::Provided(ref m) => m.ident
184 };
185 ident.name
186 }
187 _ => fail!("callee is not a trait method")
188 }
189 } else {
190 csearch::get_item_path(bcx.tcx(), method_id).last().unwrap().name()
191 };
192 debug!("trans_static_method_callee: method_id={:?}, expr_id={:?}, \
193 name={}", method_id, expr_id, token::get_name(mname));
194
195 let vtable_key = MethodCall::expr(expr_id);
196 let vtbls = resolve_vtables_in_fn_ctxt(bcx.fcx, ccx.tcx.vtable_map.borrow()
197 .get(&vtable_key).as_slice());
198
199 match vtbls.move_iter().nth(bound_index).unwrap().move_iter().nth(0).unwrap() {
200 typeck::vtable_static(impl_did, rcvr_substs, rcvr_origins) => {
201 assert!(rcvr_substs.iter().all(|t| !ty::type_needs_infer(*t)));
202
203 let mth_id = method_with_name(ccx, impl_did, mname);
204 let (callee_substs, callee_origins) =
205 combine_impl_and_methods_tps(
206 bcx, mth_id, ExprId(expr_id),
207 rcvr_substs, rcvr_origins);
208
209 let llfn = trans_fn_ref_with_vtables(bcx, mth_id, ExprId(expr_id),
210 callee_substs,
211 Some(callee_origins));
212
213 let callee_ty = node_id_type(bcx, expr_id);
214 let llty = type_of_fn_from_ty(ccx, callee_ty).ptr_to();
215 PointerCast(bcx, llfn, llty)
216 }
217 _ => {
218 fail!("vtable_param left in monomorphized \
219 function's vtable substs");
220 }
221 }
222 }
223
224 fn method_with_name(ccx: &CrateContext,
225 impl_id: ast::DefId,
226 name: ast::Name) -> ast::DefId {
227 match ccx.impl_method_cache.borrow().find_copy(&(impl_id, name)) {
228 Some(m) => return m,
229 None => {}
230 }
231
232 let methods = ccx.tcx.impl_methods.borrow();
233 let methods = methods.find(&impl_id)
234 .expect("could not find impl while translating");
235 let meth_did = methods.iter().find(|&did| ty::method(&ccx.tcx, *did).ident.name == name)
236 .expect("could not find method while translating");
237
238 ccx.impl_method_cache.borrow_mut().insert((impl_id, name), *meth_did);
239 *meth_did
240 }
241
242 fn trans_monomorphized_callee<'a>(bcx: &'a Block<'a>,
243 method_call: MethodCall,
244 trait_id: ast::DefId,
245 n_method: uint,
246 vtbl: typeck::vtable_origin)
247 -> Callee<'a> {
248 let _icx = push_ctxt("meth::trans_monomorphized_callee");
249 match vtbl {
250 typeck::vtable_static(impl_did, rcvr_substs, rcvr_origins) => {
251 let ccx = bcx.ccx();
252 let mname = ty::trait_method(ccx.tcx(), trait_id, n_method).ident;
253 let mth_id = method_with_name(bcx.ccx(), impl_did, mname.name);
254
255 // create a concatenated set of substitutions which includes
256 // those from the impl and those from the method:
257 let (callee_substs, callee_origins) =
258 combine_impl_and_methods_tps(
259 bcx, mth_id, MethodCall(method_call),
260 rcvr_substs, rcvr_origins);
261
262 // translate the function
263 let llfn = trans_fn_ref_with_vtables(bcx,
264 mth_id,
265 MethodCall(method_call),
266 callee_substs,
267 Some(callee_origins));
268
269 Callee { bcx: bcx, data: Fn(llfn) }
270 }
271 typeck::vtable_param(..) => {
272 fail!("vtable_param left in monomorphized function's vtable substs");
273 }
274 }
275 }
276
277 fn combine_impl_and_methods_tps(bcx: &Block,
278 mth_did: ast::DefId,
279 node: ExprOrMethodCall,
280 rcvr_substs: Vec<ty::t>,
281 rcvr_origins: typeck::vtable_res)
282 -> (Vec<ty::t>, typeck::vtable_res) {
283 /*!
284 *
285 * Creates a concatenated set of substitutions which includes
286 * those from the impl and those from the method. This are
287 * some subtle complications here. Statically, we have a list
288 * of type parameters like `[T0, T1, T2, M1, M2, M3]` where
289 * `Tn` are type parameters that appear on the receiver. For
290 * example, if the receiver is a method parameter `A` with a
291 * bound like `trait<B,C,D>` then `Tn` would be `[B,C,D]`.
292 *
293 * The weird part is that the type `A` might now be bound to
294 * any other type, such as `foo<X>`. In that case, the vector
295 * we want is: `[X, M1, M2, M3]`. Therefore, what we do now is
296 * to slice off the method type parameters and append them to
297 * the type parameters from the type that the receiver is
298 * mapped to. */
299
300 let ccx = bcx.ccx();
301 let method = ty::method(ccx.tcx(), mth_did);
302 let n_m_tps = method.generics.type_param_defs().len();
303 let node_substs = node_id_type_params(bcx, node);
304 debug!("rcvr_substs={:?}", rcvr_substs.repr(ccx.tcx()));
305 debug!("node_substs={:?}", node_substs.repr(ccx.tcx()));
306 let mut ty_substs = rcvr_substs;
307 {
308 let start = node_substs.len() - n_m_tps;
309 ty_substs.extend(node_substs.move_iter().skip(start));
310 }
311 debug!("n_m_tps={:?}", n_m_tps);
312 debug!("ty_substs={:?}", ty_substs.repr(ccx.tcx()));
313
314
315 // Now, do the same work for the vtables. The vtables might not
316 // exist, in which case we need to make them.
317 let vtable_key = match node {
318 ExprId(id) => MethodCall::expr(id),
319 MethodCall(method_call) => method_call
320 };
321 let mut vtables = rcvr_origins;
322 match node_vtables(bcx, vtable_key) {
323 Some(vt) => {
324 let start = vt.len() - n_m_tps;
325 vtables.extend(vt.move_iter().skip(start));
326 }
327 None => {
328 vtables.extend(range(0, n_m_tps).map(
329 |_| -> typeck::vtable_param_res {
330 Vec::new()
331 }
332 ));
333 }
334 }
335
336 (ty_substs, vtables)
337 }
338
339 fn trans_trait_callee<'a>(bcx: &'a Block<'a>,
340 method_ty: ty::t,
341 n_method: uint,
342 self_expr: &ast::Expr,
343 arg_cleanup_scope: cleanup::ScopeId)
344 -> Callee<'a> {
345 /*!
346 * Create a method callee where the method is coming from a trait
347 * object (e.g., Box<Trait> type). In this case, we must pull the fn
348 * pointer out of the vtable that is packaged up with the object.
349 * Objects are represented as a pair, so we first evaluate the self
350 * expression and then extract the self data and vtable out of the
351 * pair.
352 */
353
354 let _icx = push_ctxt("meth::trans_trait_callee");
355 let mut bcx = bcx;
356
357 // Translate self_datum and take ownership of the value by
358 // converting to an rvalue.
359 let self_datum = unpack_datum!(
360 bcx, expr::trans(bcx, self_expr));
361
362 let llval = if ty::type_needs_drop(bcx.tcx(), self_datum.ty) {
363 let self_datum = unpack_datum!(
364 bcx, self_datum.to_rvalue_datum(bcx, "trait_callee"));
365
366 // Convert to by-ref since `trans_trait_callee_from_llval` wants it
367 // that way.
368 let self_datum = unpack_datum!(
369 bcx, self_datum.to_ref_datum(bcx));
370
371 // Arrange cleanup in case something should go wrong before the
372 // actual call occurs.
373 self_datum.add_clean(bcx.fcx, arg_cleanup_scope)
374 } else {
375 // We don't have to do anything about cleanups for &Trait and &mut Trait.
376 assert!(self_datum.kind.is_by_ref());
377 self_datum.val
378 };
379
380 trans_trait_callee_from_llval(bcx, method_ty, n_method, llval)
381 }
382
383 pub fn trans_trait_callee_from_llval<'a>(bcx: &'a Block<'a>,
384 callee_ty: ty::t,
385 n_method: uint,
386 llpair: ValueRef)
387 -> Callee<'a> {
388 /*!
389 * Same as `trans_trait_callee()` above, except that it is given
390 * a by-ref pointer to the object pair.
391 */
392
393 let _icx = push_ctxt("meth::trans_trait_callee");
394 let ccx = bcx.ccx();
395
396 // Load the data pointer from the object.
397 debug!("(translating trait callee) loading second index from pair");
398 let llboxptr = GEPi(bcx, llpair, [0u, abi::trt_field_box]);
399 let llbox = Load(bcx, llboxptr);
400 let llself = PointerCast(bcx, llbox, Type::i8p(ccx));
401
402 // Load the function from the vtable and cast it to the expected type.
403 debug!("(translating trait callee) loading method");
404 // Replace the self type (&Self or Box<Self>) with an opaque pointer.
405 let llcallee_ty = match ty::get(callee_ty).sty {
406 ty::ty_bare_fn(ref f) if f.abi == Rust => {
407 type_of_rust_fn(ccx, true, f.sig.inputs.slice_from(1), f.sig.output)
408 }
409 _ => {
410 ccx.sess().bug("meth::trans_trait_callee given non-bare-rust-fn");
411 }
412 };
413 let llvtable = Load(bcx,
414 PointerCast(bcx,
415 GEPi(bcx, llpair,
416 [0u, abi::trt_field_vtable]),
417 Type::vtable(ccx).ptr_to().ptr_to()));
418 let mptr = Load(bcx, GEPi(bcx, llvtable, [0u, n_method + 1]));
419 let mptr = PointerCast(bcx, mptr, llcallee_ty.ptr_to());
420
421 return Callee {
422 bcx: bcx,
423 data: TraitMethod(MethodData {
424 llfn: mptr,
425 llself: llself,
426 })
427 };
428 }
429
430 /// Creates a returns a dynamic vtable for the given type and vtable origin.
431 /// This is used only for objects.
432 fn get_vtable(bcx: &Block,
433 self_ty: ty::t,
434 origins: typeck::vtable_param_res)
435 -> ValueRef {
436 let ccx = bcx.ccx();
437 let _icx = push_ctxt("meth::get_vtable");
438
439 // Check the cache.
440 let hash_id = (self_ty, monomorphize::make_vtable_id(ccx, origins.get(0)));
441 match ccx.vtables.borrow().find(&hash_id) {
442 Some(&val) => { return val }
443 None => { }
444 }
445
446 // Not in the cache. Actually build it.
447 let methods = origins.move_iter().flat_map(|origin| {
448 match origin {
449 typeck::vtable_static(id, substs, sub_vtables) => {
450 emit_vtable_methods(bcx, id, substs, sub_vtables).move_iter()
451 }
452 _ => ccx.sess().bug("get_vtable: expected a static origin"),
453 }
454 });
455
456 // Generate a destructor for the vtable.
457 let drop_glue = glue::get_drop_glue(ccx, self_ty);
458 let vtable = make_vtable(ccx, drop_glue, methods);
459
460 ccx.vtables.borrow_mut().insert(hash_id, vtable);
461 vtable
462 }
463
464 /// Helper function to declare and initialize the vtable.
465 pub fn make_vtable<I: Iterator<ValueRef>>(ccx: &CrateContext,
466 drop_glue: ValueRef,
467 ptrs: I)
468 -> ValueRef {
469 let _icx = push_ctxt("meth::make_vtable");
470
471 let components: Vec<_> = Some(drop_glue).move_iter().chain(ptrs).collect();
472
473 unsafe {
474 let tbl = C_struct(ccx, components.as_slice(), false);
475 let sym = token::gensym("vtable");
476 let vt_gvar = format!("vtable{}", sym).with_c_str(|buf| {
477 llvm::LLVMAddGlobal(ccx.llmod, val_ty(tbl).to_ref(), buf)
478 });
479 llvm::LLVMSetInitializer(vt_gvar, tbl);
480 llvm::LLVMSetGlobalConstant(vt_gvar, lib::llvm::True);
481 lib::llvm::SetLinkage(vt_gvar, lib::llvm::InternalLinkage);
482 vt_gvar
483 }
484 }
485
486 fn emit_vtable_methods(bcx: &Block,
487 impl_id: ast::DefId,
488 substs: Vec<ty::t>,
489 vtables: typeck::vtable_res)
490 -> Vec<ValueRef> {
491 let ccx = bcx.ccx();
492 let tcx = ccx.tcx();
493
494 let trt_id = match ty::impl_trait_ref(tcx, impl_id) {
495 Some(t_id) => t_id.def_id,
496 None => ccx.sess().bug("make_impl_vtable: don't know how to \
497 make a vtable for a type impl!")
498 };
499
500 ty::populate_implementations_for_trait_if_necessary(bcx.tcx(), trt_id);
501
502 let trait_method_def_ids = ty::trait_method_def_ids(tcx, trt_id);
503 trait_method_def_ids.iter().map(|method_def_id| {
504 let ident = ty::method(tcx, *method_def_id).ident;
505 // The substitutions we have are on the impl, so we grab
506 // the method type from the impl to substitute into.
507 let m_id = method_with_name(ccx, impl_id, ident.name);
508 let m = ty::method(tcx, m_id);
509 debug!("(making impl vtable) emitting method {} at subst {}",
510 m.repr(tcx),
511 substs.repr(tcx));
512 if m.generics.has_type_params() ||
513 ty::type_has_self(ty::mk_bare_fn(tcx, m.fty.clone())) {
514 debug!("(making impl vtable) method has self or type params: {}",
515 token::get_ident(ident));
516 C_null(Type::nil(ccx).ptr_to())
517 } else {
518 trans_fn_ref_with_vtables(bcx, m_id, ExprId(0),
519 substs.clone(), Some(vtables.clone()))
520 }
521 }).collect()
522 }
523
524 pub fn trans_trait_cast<'a>(bcx: &'a Block<'a>,
525 datum: Datum<Expr>,
526 id: ast::NodeId,
527 dest: expr::Dest)
528 -> &'a Block<'a> {
529 /*!
530 * Generates the code to convert from a pointer (`Box<T>`, `&T`, etc)
531 * into an object (`Box<Trait>`, `&Trait`, etc). This means creating a
532 * pair where the first word is the vtable and the second word is
533 * the pointer.
534 */
535
536 let mut bcx = bcx;
537 let _icx = push_ctxt("meth::trans_cast");
538
539 let lldest = match dest {
540 Ignore => {
541 return datum.clean(bcx, "trait_cast", id);
542 }
543 SaveIn(dest) => dest
544 };
545
546 let ccx = bcx.ccx();
547 let v_ty = datum.ty;
548 let llbox_ty = type_of(bcx.ccx(), datum.ty);
549
550 // Store the pointer into the first half of pair.
551 let mut llboxdest = GEPi(bcx, lldest, [0u, abi::trt_field_box]);
552 llboxdest = PointerCast(bcx, llboxdest, llbox_ty.ptr_to());
553 bcx = datum.store_to(bcx, llboxdest);
554
555 // Store the vtable into the second half of pair.
556 let origins = {
557 let vtable_map = ccx.tcx.vtable_map.borrow();
558 resolve_param_vtables_under_param_substs(ccx.tcx(),
559 bcx.fcx.param_substs,
560 vtable_map.get(&MethodCall::expr(id)).get(0).as_slice())
561 };
562 let vtable = get_vtable(bcx, v_ty, origins);
563 let llvtabledest = GEPi(bcx, lldest, [0u, abi::trt_field_vtable]);
564 let llvtabledest = PointerCast(bcx, llvtabledest, val_ty(vtable).ptr_to());
565 Store(bcx, vtable, llvtabledest);
566
567 bcx
568 }
librustc/middle/trans/meth.rs:276:1-276:1 -fn- definition:
fn combine_impl_and_methods_tps(bcx: &Block,
mth_did: ast::DefId,
node: ExprOrMethodCall,
references:- 2257: let (callee_substs, callee_origins) =
258: combine_impl_and_methods_tps(
259: bcx, mth_id, MethodCall(method_call),
librustc/middle/trans/meth.rs:382:1-382:1 -fn- definition:
pub fn trans_trait_callee_from_llval<'a>(bcx: &'a Block<'a>,
callee_ty: ty::t,
n_method: uint,
references:- 2380: trans_trait_callee_from_llval(bcx, method_ty, n_method, llval)
381: }
librustc/middle/trans/reflect.rs:
103: self.bcx, None, mth_ty,
104: |bcx, _| meth::trans_trait_callee_from_llval(bcx,
105: mth_ty,
librustc/middle/trans/meth.rs:523:1-523:1 -fn- definition:
pub fn trans_trait_cast<'a>(bcx: &'a Block<'a>,
datum: Datum<Expr>,
id: ast::NodeId,
references:- 2librustc/middle/trans/expr.rs:
208: let scratch = rvalue_scratch_datum(bcx, adjusted_ty, "__adjust");
209: bcx = meth::trans_trait_cast(
210: bcx, datum, expr.id, SaveIn(scratch.val));
--
748: let datum = unpack_datum!(bcx, trans(bcx, val));
749: meth::trans_trait_cast(bcx, datum, expr.id, dest)
750: }
librustc/middle/trans/meth.rs:77:1-77:1 -fn- definition:
pub fn trans_method_callee<'a>(
bcx: &'a Block<'a>,
method_call: MethodCall,
references:- 2librustc/middle/trans/callee.rs:
488: |cx, arg_cleanup_scope| {
489: meth::trans_method_callee(cx, method_call, Some(rcvr), arg_cleanup_scope)
490: },
librustc/middle/trans/expr.rs:
1448: |bcx, arg_cleanup_scope| {
1449: meth::trans_method_callee(bcx,
1450: method_call,
librustc/middle/trans/meth.rs:223:1-223:1 -fn- definition:
fn method_with_name(ccx: &CrateContext,
impl_id: ast::DefId,
name: ast::Name) -> ast::DefId {
references:- 3252: let mname = ty::trait_method(ccx.tcx(), trait_id, n_method).ident;
253: let mth_id = method_with_name(bcx.ccx(), impl_did, mname.name);
--
506: // the method type from the impl to substitute into.
507: let m_id = method_with_name(ccx, impl_id, ident.name);
508: let m = ty::method(tcx, m_id);
librustc/middle/trans/meth.rs:144:1-144:1 -fn- definition:
pub fn trans_static_method_callee(bcx: &Block,
method_id: ast::DefId,
trait_id: ast::DefId,
references:- 2librustc/middle/trans/callee.rs:
124: _) => {
125: fn_callee(bcx, meth::trans_static_method_callee(bcx, impl_did,
126: trait_did,
librustc/middle/trans/expr.rs:
834: ast::DefStaticMethod(impl_did, ast::FromTrait(trait_did), _) => {
835: meth::trans_static_method_callee(bcx, impl_did,
836: trait_did, ref_expr.id)