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.
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.
14 use llvm::{ConstFCmp, ConstICmp, SetLinkage, PrivateLinkage, ValueRef, Bool, True, False};
15 use llvm::{IntEQ, IntNE, IntUGT, IntUGE, IntULT, IntULE, IntSGT, IntSGE, IntSLT, IntSLE,
16 RealOEQ, RealOGT, RealOGE, RealOLT, RealOLE, RealONE};
17 use middle::{const_eval, def};
18 use trans::{adt, closure, consts, debuginfo, expr, inline, machine};
19 use trans::base::{self, push_ctxt};
21 use trans::type_::Type;
23 use middle::subst::Substs;
24 use middle::ty::{self, Ty};
25 use util::ppaux::{Repr, ty_to_string};
27 use std::c_str::ToCStr;
28 use std::iter::repeat;
30 use syntax::{ast, ast_util};
33 pub fn const_lit(cx: &CrateContext, e: &ast::Expr, lit: &ast::Lit)
35 let _icx = push_ctxt("trans_lit");
36 debug!("const_lit: {}", lit);
38 ast::LitByte(b) => C_integral(Type::uint_from_ty(cx, ast::TyU8), b as u64, false),
39 ast::LitChar(i) => C_integral(Type::char(cx), i as u64, false),
40 ast::LitInt(i, ast::SignedIntLit(t, _)) => {
41 C_integral(Type::int_from_ty(cx, t), i, true)
43 ast::LitInt(u, ast::UnsignedIntLit(t)) => {
44 C_integral(Type::uint_from_ty(cx, t), u, false)
46 ast::LitInt(i, ast::UnsuffixedIntLit(_)) => {
47 let lit_int_ty = ty::node_id_to_type(cx.tcx(), e.id);
48 match lit_int_ty.sty {
50 C_integral(Type::int_from_ty(cx, t), i as u64, true)
53 C_integral(Type::uint_from_ty(cx, t), i as u64, false)
55 _ => cx.sess().span_bug(lit.span,
56 format!("integer literal has type {} (expected int \
58 ty_to_string(cx.tcx(), lit_int_ty))[])
61 ast::LitFloat(ref fs, t) => {
62 C_floating(fs.get(), Type::float_from_ty(cx, t))
64 ast::LitFloatUnsuffixed(ref fs) => {
65 let lit_float_ty = ty::node_id_to_type(cx.tcx(), e.id);
66 match lit_float_ty.sty {
68 C_floating(fs.get(), Type::float_from_ty(cx, t))
71 cx.sess().span_bug(lit.span,
72 "floating point literal doesn't have the right type");
76 ast::LitBool(b) => C_bool(cx, b),
77 ast::LitStr(ref s, _) => C_str_slice(cx, (*s).clone()),
78 ast::LitBinary(ref data) => C_binary_slice(cx, data[]),
82 pub fn ptrcast(val: ValueRef, ty: Type) -> ValueRef {
84 llvm::LLVMConstPointerCast(val, ty.to_ref())
88 fn const_vec(cx: &CrateContext, e: &ast::Expr,
89 es: &[P<ast::Expr>]) -> (ValueRef, Type) {
90 let vec_ty = ty::expr_ty(cx.tcx(), e);
91 let unit_ty = ty::sequence_element_type(cx.tcx(), vec_ty);
92 let llunitty = type_of::type_of(cx, unit_ty);
93 let vs = es.iter().map(|e| const_expr(cx, &**e).0)
95 // If the vector contains enums, an LLVM array won't work.
96 let v = if vs.iter().any(|vi| val_ty(*vi) != llunitty) {
97 C_struct(cx, vs[], false)
99 C_array(llunitty, vs[])
104 pub fn const_addr_of(cx: &CrateContext, cv: ValueRef, mutbl: ast::Mutability) -> ValueRef {
106 let gv = "const".with_c_str(|name| {
107 llvm::LLVMAddGlobal(cx.llmod(), val_ty(cv).to_ref(), name)
109 llvm::LLVMSetInitializer(gv, cv);
110 llvm::LLVMSetGlobalConstant(gv,
111 if mutbl == ast::MutImmutable {True} else {False});
112 SetLinkage(gv, PrivateLinkage);
117 fn const_deref_ptr(cx: &CrateContext, v: ValueRef) -> ValueRef {
118 let v = match cx.const_globals().borrow().get(&(v as int)) {
123 llvm::LLVMGetInitializer(v)
127 fn const_deref_newtype<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, v: ValueRef, t: Ty<'tcx>)
129 let repr = adt::represent_type(cx, t);
130 adt::const_get_field(cx, &*repr, v, 0, 0)
133 fn const_deref<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, v: ValueRef,
134 t: Ty<'tcx>, explicit: bool)
135 -> (ValueRef, Ty<'tcx>) {
136 match ty::deref(t, explicit) {
139 ty::ty_ptr(mt) | ty::ty_rptr(_, mt) => {
140 if type_is_sized(cx.tcx(), mt.ty) {
141 (const_deref_ptr(cx, v), mt.ty)
143 // Derefing a fat pointer does not change the representation,
144 // just the type to ty_open.
145 (v, ty::mk_open(cx.tcx(), mt.ty))
148 ty::ty_enum(..) | ty::ty_struct(..) => {
149 assert!(mt.mutbl != ast::MutMutable);
150 (const_deref_newtype(cx, v, t), mt.ty)
153 cx.sess().bug(format!("unexpected dereferenceable type {}",
154 ty_to_string(cx.tcx(), t))[])
159 cx.sess().bug(format!("cannot dereference const of type {}",
160 ty_to_string(cx.tcx(), t))[])
165 pub fn get_const_val(cx: &CrateContext,
166 mut def_id: ast::DefId) -> ValueRef {
167 let contains_key = cx.const_values().borrow().contains_key(&def_id.node);
168 if !ast_util::is_local(def_id) || !contains_key {
169 if !ast_util::is_local(def_id) {
170 def_id = inline::maybe_instantiate_inline(cx, def_id);
173 if let ast::ItemConst(..) = cx.tcx().map.expect_item(def_id.node).node {
174 base::get_item_val(cx, def_id.node);
178 cx.const_values().borrow()[def_id.node].clone()
181 pub fn const_expr<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>, e: &ast::Expr)
182 -> (ValueRef, Ty<'tcx>) {
183 let llconst = const_expr_unadjusted(cx, e);
184 let mut llconst = llconst;
185 let ety = ty::expr_ty(cx.tcx(), e);
186 let mut ety_adjusted = ty::expr_ty_adjusted(cx.tcx(), e);
187 let opt_adj = cx.tcx().adjustments.borrow().get(&e.id).cloned();
192 ty::AdjustAddEnv(def_id, ty::RegionTraitStore(ty::ReStatic, _)) => {
193 let wrapper = closure::get_wrapper_for_bare_fn(cx,
198 llconst = C_struct(cx, &[wrapper, C_null(Type::i8p(cx))], false)
200 ty::AdjustAddEnv(_, store) => {
203 format!("unexpected static function: {}",
206 ty::AdjustReifyFnPointer(_def_id) => {
207 // FIXME(#19925) once fn item types are
208 // zero-sized, we'll need to do something here
210 ty::AdjustDerefRef(ref adj) => {
212 // Save the last autoderef in case we can avoid it.
213 if adj.autoderefs > 0 {
214 for _ in range(0, adj.autoderefs-1) {
215 let (dv, dt) = const_deref(cx, llconst, ty, false);
223 let (dv, dt) = const_deref(cx, llconst, ty, false);
226 // If we derefed a fat pointer then we will have an
227 // open type here. So we need to update the type with
228 // the one returned from const_deref.
231 Some(ref autoref) => {
233 ty::AutoUnsafe(_, None) |
234 ty::AutoPtr(ty::ReStatic, _, None) => {
235 // Don't copy data to do a deref+ref
236 // (i.e., skip the last auto-deref).
237 if adj.autoderefs == 0 {
238 llconst = const_addr_of(cx, llconst, ast::MutImmutable);
241 ty::AutoPtr(ty::ReStatic, _, Some(box ty::AutoUnsize(..))) => {
242 if adj.autoderefs > 0 {
243 // Seeing as we are deref'ing here and take a reference
244 // again to make the pointer part of the far pointer below,
245 // we just skip the whole thing. We still need the type
246 // though. This works even if we don't need to deref
247 // because of byref semantics. Note that this is not just
248 // an optimisation, it is necessary for mutable vectors to
250 let (_, dt) = const_deref(cx, llconst, ty, false);
253 llconst = const_addr_of(cx, llconst, ast::MutImmutable)
257 ty::ty_vec(unit_ty, Some(len)) => {
258 let llunitty = type_of::type_of(cx, unit_ty);
259 let llptr = ptrcast(llconst, llunitty.ptr_to());
260 assert!(cx.const_globals().borrow_mut()
261 .insert(llptr as int, llconst).is_none());
262 assert_eq!(abi::FAT_PTR_ADDR, 0);
263 assert_eq!(abi::FAT_PTR_EXTRA, 1);
264 llconst = C_struct(cx, &[
269 _ => cx.sess().span_bug(e.span,
270 format!("unimplemented type in const unsize: {}",
271 ty_to_string(cx.tcx(), ty))[])
277 format!("unimplemented const \
289 let llty = type_of::sizing_type_of(cx, ety_adjusted);
290 let csize = machine::llsize_of_alloc(cx, val_ty(llconst));
291 let tsize = machine::llsize_of_alloc(cx, llty);
294 // FIXME these values could use some context
295 llvm::LLVMDumpValue(llconst);
296 llvm::LLVMDumpValue(C_undef(llty));
298 cx.sess().bug(format!("const {} of type {} has size {} instead of {}",
299 e.repr(cx.tcx()), ty_to_string(cx.tcx(), ety),
302 (llconst, ety_adjusted)
305 // the bool returned is whether this expression can be inlined into other crates
306 // if it's assigned to a static.
307 fn const_expr_unadjusted(cx: &CrateContext, e: &ast::Expr) -> ValueRef {
308 let map_list = |&: exprs: &[P<ast::Expr>]| {
309 exprs.iter().map(|e| const_expr(cx, &**e).0)
310 .fold(Vec::new(), |mut l, val| { l.push(val); l })
313 let _icx = push_ctxt("const_expr");
314 return match e.node {
315 ast::ExprLit(ref lit) => {
316 consts::const_lit(cx, e, &**lit)
318 ast::ExprBinary(b, ref e1, ref e2) => {
319 let (te1, _) = const_expr(cx, &**e1);
320 let (te2, _) = const_expr(cx, &**e2);
322 let te2 = base::cast_shift_const_rhs(b, te1, te2);
324 /* Neither type is bottom, and we expect them to be unified
325 * already, so the following is safe. */
326 let ty = ty::expr_ty(cx.tcx(), &**e1);
327 let is_float = ty::type_is_fp(ty);
328 let signed = ty::type_is_signed(ty);
331 if is_float { llvm::LLVMConstFAdd(te1, te2) }
332 else { llvm::LLVMConstAdd(te1, te2) }
335 if is_float { llvm::LLVMConstFSub(te1, te2) }
336 else { llvm::LLVMConstSub(te1, te2) }
339 if is_float { llvm::LLVMConstFMul(te1, te2) }
340 else { llvm::LLVMConstMul(te1, te2) }
343 if is_float { llvm::LLVMConstFDiv(te1, te2) }
344 else if signed { llvm::LLVMConstSDiv(te1, te2) }
345 else { llvm::LLVMConstUDiv(te1, te2) }
348 if is_float { llvm::LLVMConstFRem(te1, te2) }
349 else if signed { llvm::LLVMConstSRem(te1, te2) }
350 else { llvm::LLVMConstURem(te1, te2) }
352 ast::BiAnd => llvm::LLVMConstAnd(te1, te2),
353 ast::BiOr => llvm::LLVMConstOr(te1, te2),
354 ast::BiBitXor => llvm::LLVMConstXor(te1, te2),
355 ast::BiBitAnd => llvm::LLVMConstAnd(te1, te2),
356 ast::BiBitOr => llvm::LLVMConstOr(te1, te2),
357 ast::BiShl => llvm::LLVMConstShl(te1, te2),
359 if signed { llvm::LLVMConstAShr(te1, te2) }
360 else { llvm::LLVMConstLShr(te1, te2) }
363 if is_float { ConstFCmp(RealOEQ, te1, te2) }
364 else { ConstICmp(IntEQ, te1, te2) }
367 if is_float { ConstFCmp(RealOLT, te1, te2) }
369 if signed { ConstICmp(IntSLT, te1, te2) }
370 else { ConstICmp(IntULT, te1, te2) }
374 if is_float { ConstFCmp(RealOLE, te1, te2) }
376 if signed { ConstICmp(IntSLE, te1, te2) }
377 else { ConstICmp(IntULE, te1, te2) }
381 if is_float { ConstFCmp(RealONE, te1, te2) }
382 else { ConstICmp(IntNE, te1, te2) }
385 if is_float { ConstFCmp(RealOGE, te1, te2) }
387 if signed { ConstICmp(IntSGE, te1, te2) }
388 else { ConstICmp(IntUGE, te1, te2) }
392 if is_float { ConstFCmp(RealOGT, te1, te2) }
394 if signed { ConstICmp(IntSGT, te1, te2) }
395 else { ConstICmp(IntUGT, te1, te2) }
400 ast::ExprUnary(u, ref e) => {
401 let (te, _) = const_expr(cx, &**e);
402 let ty = ty::expr_ty(cx.tcx(), &**e);
403 let is_float = ty::type_is_fp(ty);
405 ast::UnUniq | ast::UnDeref => {
406 let (dv, _dt) = const_deref(cx, te, ty, true);
409 ast::UnNot => llvm::LLVMConstNot(te),
411 if is_float { llvm::LLVMConstFNeg(te) }
412 else { llvm::LLVMConstNeg(te) }
416 ast::ExprField(ref base, field) => {
417 let (bv, bt) = const_expr(cx, &**base);
418 let brepr = adt::represent_type(cx, bt);
419 expr::with_field_tys(cx.tcx(), bt, None, |discr, field_tys| {
420 let ix = ty::field_idx_strict(cx.tcx(), field.node.name, field_tys);
421 adt::const_get_field(cx, &*brepr, bv, discr, ix)
424 ast::ExprTupField(ref base, idx) => {
425 let (bv, bt) = const_expr(cx, &**base);
426 let brepr = adt::represent_type(cx, bt);
427 expr::with_field_tys(cx.tcx(), bt, None, |discr, _| {
428 adt::const_get_field(cx, &*brepr, bv, discr, idx.node)
432 ast::ExprIndex(ref base, ref index) => {
433 let (bv, bt) = const_expr(cx, &**base);
434 let iv = match const_eval::eval_const_expr(cx.tcx(), &**index) {
435 const_eval::const_int(i) => i as u64,
436 const_eval::const_uint(u) => u,
437 _ => cx.sess().span_bug(index.span,
438 "index is not an integer-constant expression")
440 let (arr, len) = match bt.sty {
441 ty::ty_vec(_, Some(u)) => (bv, C_uint(cx, u)),
442 ty::ty_open(ty) => match ty.sty {
443 ty::ty_vec(_, None) | ty::ty_str => {
444 let e1 = const_get_elt(cx, bv, &[0]);
445 (const_deref_ptr(cx, e1), const_get_elt(cx, bv, &[1]))
447 _ => cx.sess().span_bug(base.span,
448 format!("index-expr base must be a vector \
449 or string type, found {}",
450 ty_to_string(cx.tcx(), bt))[])
452 ty::ty_rptr(_, mt) => match mt.ty.sty {
453 ty::ty_vec(_, Some(u)) => {
454 (const_deref_ptr(cx, bv), C_uint(cx, u))
456 _ => cx.sess().span_bug(base.span,
457 format!("index-expr base must be a vector \
458 or string type, found {}",
459 ty_to_string(cx.tcx(), bt))[])
461 _ => cx.sess().span_bug(base.span,
462 format!("index-expr base must be a vector \
463 or string type, found {}",
464 ty_to_string(cx.tcx(), bt))[])
467 let len = llvm::LLVMConstIntGetZExtValue(len) as u64;
468 let len = match bt.sty {
469 ty::ty_uniq(ty) | ty::ty_rptr(_, ty::mt{ty, ..}) => match ty.sty {
479 // FIXME #3170: report this earlier on in the const-eval
480 // pass. Reporting here is a bit late.
481 cx.sess().span_err(e.span,
482 "const index-expr is out of bounds");
484 const_get_elt(cx, arr, &[iv as c_uint])
486 ast::ExprCast(ref base, _) => {
487 let ety = ty::expr_ty(cx.tcx(), e);
488 let llty = type_of::type_of(cx, ety);
489 let (v, basety) = const_expr(cx, &**base);
490 return match (expr::cast_type_kind(cx.tcx(), basety),
491 expr::cast_type_kind(cx.tcx(), ety)) {
493 (expr::cast_integral, expr::cast_integral) => {
494 let s = ty::type_is_signed(basety) as Bool;
495 llvm::LLVMConstIntCast(v, llty.to_ref(), s)
497 (expr::cast_integral, expr::cast_float) => {
498 if ty::type_is_signed(basety) {
499 llvm::LLVMConstSIToFP(v, llty.to_ref())
501 llvm::LLVMConstUIToFP(v, llty.to_ref())
504 (expr::cast_float, expr::cast_float) => {
505 llvm::LLVMConstFPCast(v, llty.to_ref())
507 (expr::cast_float, expr::cast_integral) => {
508 if ty::type_is_signed(ety) { llvm::LLVMConstFPToSI(v, llty.to_ref()) }
509 else { llvm::LLVMConstFPToUI(v, llty.to_ref()) }
511 (expr::cast_enum, expr::cast_integral) => {
512 let repr = adt::represent_type(cx, basety);
513 let discr = adt::const_get_discrim(cx, &*repr, v);
514 let iv = C_integral(cx.int_type(), discr, false);
515 let ety_cast = expr::cast_type_kind(cx.tcx(), ety);
517 expr::cast_integral => {
518 let s = ty::type_is_signed(ety) as Bool;
519 llvm::LLVMConstIntCast(iv, llty.to_ref(), s)
521 _ => cx.sess().bug("enum cast destination is not \
525 (expr::cast_pointer, expr::cast_pointer) => {
528 (expr::cast_integral, expr::cast_pointer) => {
529 llvm::LLVMConstIntToPtr(v, llty.to_ref())
531 (expr::cast_pointer, expr::cast_integral) => {
532 llvm::LLVMConstPtrToInt(v, llty.to_ref())
535 cx.sess().impossible_case(e.span,
536 "bad combination of types for cast")
540 ast::ExprAddrOf(mutbl, ref sub) => {
541 // If this is the address of some static, then we need to return
542 // the actual address of the static itself (short circuit the rest
547 ast::ExprParen(ref sub) => cur = sub,
551 let opt_def = cx.tcx().def_map.borrow().get(&cur.id).cloned();
552 if let Some(def::DefStatic(def_id, _)) = opt_def {
553 let ty = ty::expr_ty(cx.tcx(), e);
554 return get_static_val(cx, def_id, ty);
557 // If this isn't the address of a static, then keep going through
558 // normal constant evaluation.
559 let (e, _) = const_expr(cx, &**sub);
560 const_addr_of(cx, e, mutbl)
562 ast::ExprTup(ref es) => {
563 let ety = ty::expr_ty(cx.tcx(), e);
564 let repr = adt::represent_type(cx, ety);
565 let vals = map_list(es[]);
566 adt::trans_const(cx, &*repr, 0, vals[])
568 ast::ExprStruct(_, ref fs, ref base_opt) => {
569 let ety = ty::expr_ty(cx.tcx(), e);
570 let repr = adt::represent_type(cx, ety);
573 let base_val = match *base_opt {
574 Some(ref base) => Some(const_expr(cx, &**base)),
578 expr::with_field_tys(tcx, ety, Some(e.id), |discr, field_tys| {
579 let cs = field_tys.iter().enumerate()
580 .map(|(ix, &field_ty)| {
581 match fs.iter().find(|f| field_ty.name == f.ident.node.name) {
582 Some(ref f) => const_expr(cx, &*f.expr).0,
586 adt::const_get_field(cx, &*repr, bv,
590 cx.sess().span_bug(e.span,
591 "missing struct field")
596 }).collect::<Vec<_>>();
597 adt::trans_const(cx, &*repr, discr, cs[])
600 ast::ExprVec(ref es) => {
601 const_vec(cx, e, es.as_slice()).0
603 ast::ExprRepeat(ref elem, ref count) => {
604 let vec_ty = ty::expr_ty(cx.tcx(), e);
605 let unit_ty = ty::sequence_element_type(cx.tcx(), vec_ty);
606 let llunitty = type_of::type_of(cx, unit_ty);
607 let n = match const_eval::eval_const_expr(cx.tcx(), &**count) {
608 const_eval::const_int(i) => i as uint,
609 const_eval::const_uint(i) => i as uint,
610 _ => cx.sess().span_bug(count.span, "count must be integral const expression.")
612 let vs: Vec<_> = repeat(const_expr(cx, &**elem).0).take(n).collect();
613 if vs.iter().any(|vi| val_ty(*vi) != llunitty) {
614 C_struct(cx, vs[], false)
616 C_array(llunitty, vs[])
619 ast::ExprPath(_) => {
620 let def = cx.tcx().def_map.borrow()[e.id];
622 def::DefFn(..) | def::DefStaticMethod(..) | def::DefMethod(..) => {
623 expr::trans_def_fn_unadjusted(cx, e, def, &Substs::trans_empty()).val
625 def::DefConst(def_id) => {
626 get_const_val(cx, def_id)
628 def::DefVariant(enum_did, variant_did, _) => {
629 let vinfo = ty::enum_variant_with_id(cx.tcx(),
632 if vinfo.args.len() > 0 {
634 expr::trans_def_fn_unadjusted(cx, e, def, &Substs::trans_empty()).val
637 let ety = ty::expr_ty(cx.tcx(), e);
638 let repr = adt::represent_type(cx, ety);
639 adt::trans_const(cx, &*repr, vinfo.disr_val, &[])
642 def::DefStruct(_) => {
643 let ety = ty::expr_ty(cx.tcx(), e);
644 if let ty::ty_bare_fn(..) = ety.sty {
646 expr::trans_def_fn_unadjusted(cx, e, def, &Substs::trans_empty()).val
649 C_null(type_of::type_of(cx, ety))
653 cx.sess().span_bug(e.span, "expected a const, fn, struct, \
658 ast::ExprCall(ref callee, ref args) => {
659 let opt_def = cx.tcx().def_map.borrow().get(&callee.id).cloned();
661 Some(def::DefStruct(_)) => {
662 let ety = ty::expr_ty(cx.tcx(), e);
663 let repr = adt::represent_type(cx, ety);
664 let arg_vals = map_list(args[]);
665 adt::trans_const(cx, &*repr, 0, arg_vals[])
667 Some(def::DefVariant(enum_did, variant_did, _)) => {
668 let ety = ty::expr_ty(cx.tcx(), e);
669 let repr = adt::represent_type(cx, ety);
670 let vinfo = ty::enum_variant_with_id(cx.tcx(),
673 let arg_vals = map_list(args[]);
679 _ => cx.sess().span_bug(e.span, "expected a struct or variant def")
682 ast::ExprParen(ref e) => const_expr(cx, &**e).0,
683 ast::ExprBlock(ref block) => {
685 Some(ref expr) => const_expr(cx, &**expr).0,
689 _ => cx.sess().span_bug(e.span,
690 "bad constant expression type in consts::const_expr")
695 pub fn trans_static(ccx: &CrateContext, m: ast::Mutability, id: ast::NodeId) {
697 let _icx = push_ctxt("trans_static");
698 let g = base::get_item_val(ccx, id);
699 // At this point, get_item_val has already translated the
700 // constant's initializer to determine its LLVM type.
701 let v = ccx.static_values().borrow()[id].clone();
702 // boolean SSA values are i1, but they have to be stored in i8 slots,
703 // otherwise some LLVM optimization passes don't work as expected
704 let v = if llvm::LLVMTypeOf(v) == Type::i1(ccx).to_ref() {
705 llvm::LLVMConstZExt(v, Type::i8(ccx).to_ref())
709 llvm::LLVMSetInitializer(g, v);
711 // As an optimization, all shared statics which do not have interior
712 // mutability are placed into read-only memory.
713 if m != ast::MutMutable {
714 let node_ty = ty::node_id_to_type(ccx.tcx(), id);
715 let tcontents = ty::type_contents(ccx.tcx(), node_ty);
716 if !tcontents.interior_unsafe() {
717 llvm::LLVMSetGlobalConstant(g, True);
720 debuginfo::create_global_var_metadata(ccx, id, g);
724 fn get_static_val<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, did: ast::DefId,
725 ty: Ty<'tcx>) -> ValueRef {
726 if ast_util::is_local(did) { return base::get_item_val(ccx, did.node) }
727 base::trans_external_path(ccx, did, ty)