1 // Copyright 2012-2014 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.
11 #[allow(non_camel_case_types)];
13 //! Code that is useful in various trans modules.
15 use driver::session::Session;
16 use lib::llvm::{ValueRef, BasicBlockRef, BuilderRef};
17 use lib::llvm::{True, False, Bool};
20 use middle::lang_items::LangItem;
21 use middle::trans::build;
22 use middle::trans::cleanup;
23 use middle::trans::datum;
24 use middle::trans::datum::{Datum, Lvalue};
25 use middle::trans::debuginfo;
26 use middle::trans::type_::Type;
27 use middle::ty::substs;
30 use util::ppaux::Repr;
31 use util::nodemap::NodeMap;
33 use arena::TypedArena;
34 use collections::HashMap;
35 use std::c_str::ToCStr;
36 use std::cell::{Cell, RefCell};
37 use std::libc::{c_uint, c_longlong, c_ulonglong, c_char};
39 use syntax::ast::Ident;
41 use syntax::ast_map::{PathElem, PathName};
42 use syntax::codemap::Span;
43 use syntax::parse::token::InternedString;
44 use syntax::parse::token;
46 pub use middle::trans::context::CrateContext;
48 fn type_is_newtype_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
49 match ty::get(ty).sty {
50 ty::ty_struct(def_id, ref substs) => {
51 let fields = ty::struct_fields(ccx.tcx(), def_id, substs);
53 fields.get(0).ident.name ==
54 token::special_idents::unnamed_field.name &&
55 type_is_immediate(ccx, fields.get(0).mt.ty)
61 pub fn type_is_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
62 use middle::trans::machine::llsize_of_alloc;
63 use middle::trans::type_of::sizing_type_of;
65 let simple = ty::type_is_scalar(ty) || ty::type_is_boxed(ty) ||
66 ty::type_is_unique(ty) || ty::type_is_region_ptr(ty) ||
67 type_is_newtype_immediate(ccx, ty) || ty::type_is_bot(ty) ||
68 ty::type_is_simd(tcx, ty);
72 match ty::get(ty).sty {
74 ty::ty_struct(..) | ty::ty_enum(..) | ty::ty_tup(..) => {
75 let llty = sizing_type_of(ccx, ty);
76 llsize_of_alloc(ccx, llty) <= llsize_of_alloc(ccx, ccx.int_type)
78 _ => type_is_zero_size(ccx, ty)
82 pub fn type_is_zero_size(ccx: &CrateContext, ty: ty::t) -> bool {
84 * Identify types which have size zero at runtime.
87 use middle::trans::machine::llsize_of_alloc;
88 use middle::trans::type_of::sizing_type_of;
89 let llty = sizing_type_of(ccx, ty);
90 llsize_of_alloc(ccx, llty) == 0
93 pub fn return_type_is_void(ccx: &CrateContext, ty: ty::t) -> bool {
95 * Identifies types which we declare to be equivalent to `void`
96 * in C for the purpose of function return types. These are
97 * `()`, bot, and uninhabited enums. Note that all such types
98 * are also zero-size, but not all zero-size types use a `void`
99 * return type (in order to aid with C ABI compatibility).
102 ty::type_is_nil(ty) || ty::type_is_bot(ty) || ty::type_is_empty(ccx.tcx(), ty)
105 /// Generates a unique symbol based off the name given. This is used to create
106 /// unique symbols for things like closures.
107 pub fn gensym_name(name: &str) -> PathElem {
108 let num = token::gensym(name);
109 // use one colon which will get translated to a period by the mangler, and
110 // we're guaranteed that `num` is globally unique for this crate.
111 PathName(token::gensym(format!("{}:{}", name, num)))
114 pub struct tydesc_info {
120 visit_glue: Cell<Option<ValueRef>>,
124 * A note on nomenclature of linking: "extern", "foreign", and "upcall".
126 * An "extern" is an LLVM symbol we wind up emitting an undefined external
127 * reference to. This means "we don't have the thing in this compilation unit,
128 * please make sure you link it in at runtime". This could be a reference to
129 * C code found in a C library, or rust code found in a rust crate.
131 * Most "externs" are implicitly declared (automatically) as a result of a
132 * user declaring an extern _module_ dependency; this causes the rust driver
133 * to locate an extern crate, scan its compilation metadata, and emit extern
134 * declarations for any symbols used by the declaring crate.
136 * A "foreign" is an extern that references C (or other non-rust ABI) code.
137 * There is no metadata to scan for extern references so in these cases either
138 * a header-digester like bindgen, or manual function prototypes, have to
139 * serve as declarators. So these are usually given explicitly as prototype
140 * declarations, in rust code, with ABI attributes on them noting which ABI to
143 * An "upcall" is a foreign call generated by the compiler (not corresponding
144 * to any user-written call in the code) into the runtime library, to perform
145 * some helper task such as bringing a task to life, allocating memory, etc.
149 pub struct NodeInfo {
154 pub fn expr_info(expr: &ast::Expr) -> NodeInfo {
155 NodeInfo { id: expr.id, span: expr.span }
159 n_static_tydescs: Cell<uint>,
160 n_glues_created: Cell<uint>,
161 n_null_glues: Cell<uint>,
162 n_real_glues: Cell<uint>,
165 n_inlines: Cell<uint>,
166 n_closures: Cell<uint>,
167 n_llvm_insns: Cell<uint>,
168 llvm_insns: RefCell<HashMap<~str, uint>>,
169 // (ident, time-in-ms, llvm-instructions)
170 fn_stats: RefCell<Vec<(~str, uint, uint)> >,
173 pub struct BuilderRef_res {
177 impl Drop for BuilderRef_res {
180 llvm::LLVMDisposeBuilder(self.b);
185 pub fn BuilderRef_res(b: BuilderRef) -> BuilderRef_res {
191 pub type ExternMap = HashMap<~str, ValueRef>;
193 // Here `self_ty` is the real type of the self parameter to this method. It
194 // will only be set in the case of default methods.
195 pub struct param_substs {
197 self_ty: Option<ty::t>,
198 vtables: Option<typeck::vtable_res>,
199 self_vtables: Option<typeck::vtable_param_res>
203 pub fn validate(&self) {
204 for t in self.tys.iter() { assert!(!ty::type_needs_infer(*t)); }
205 for t in self.self_ty.iter() { assert!(!ty::type_needs_infer(*t)); }
209 fn param_substs_to_str(this: ¶m_substs, tcx: &ty::ctxt) -> ~str {
210 format!("param_substs \\{tys:{}, vtables:{}\\}",
212 this.vtables.repr(tcx))
215 impl Repr for param_substs {
216 fn repr(&self, tcx: &ty::ctxt) -> ~str {
217 param_substs_to_str(self, tcx)
221 // work around bizarre resolve errors
222 pub type RvalueDatum = datum::Datum<datum::Rvalue>;
223 pub type LvalueDatum = datum::Datum<datum::Lvalue>;
225 // Function context. Every LLVM function we create will have one of
227 pub struct FunctionContext<'a> {
228 // The ValueRef returned from a call to llvm::LLVMAddFunction; the
229 // address of the first instruction in the sequence of
230 // instructions for this function that will go in the .text
231 // section of the executable we're generating.
234 // The environment argument in a closure.
235 llenv: Option<ValueRef>,
237 // The place to store the return value. If the return type is immediate,
238 // this is an alloca in the function. Otherwise, it's the hidden first
239 // parameter to the function. After function construction, this should
241 llretptr: Cell<Option<ValueRef>>,
243 entry_bcx: RefCell<Option<&'a Block<'a>>>,
245 // These elements: "hoisted basic blocks" containing
246 // administrative activities that have to happen in only one place in
247 // the function, due to LLVM's quirks.
248 // A marker for the place where we want to insert the function's static
249 // allocas, so that LLVM will coalesce them into a single alloca call.
250 alloca_insert_pt: Cell<Option<ValueRef>>,
251 llreturn: Cell<Option<BasicBlockRef>>,
253 // The a value alloca'd for calls to upcalls.rust_personality. Used when
254 // outputting the resume instruction.
255 personality: Cell<Option<ValueRef>>,
257 // True if the caller expects this fn to use the out pointer to
258 // return. Either way, your code should write into llretptr, but if
259 // this value is false, llretptr will be a local alloca.
260 caller_expects_out_pointer: bool,
262 // Maps arguments to allocas created for them in llallocas.
263 llargs: RefCell<NodeMap<LvalueDatum>>,
265 // Maps the def_ids for local variables to the allocas created for
266 // them in llallocas.
267 lllocals: RefCell<NodeMap<LvalueDatum>>,
269 // Same as above, but for closure upvars
270 llupvars: RefCell<NodeMap<ValueRef>>,
272 // The NodeId of the function, or -1 if it doesn't correspond to
273 // a user-defined function.
276 // If this function is being monomorphized, this contains the type
277 // substitutions used.
278 param_substs: Option<@param_substs>,
280 // The source span and nesting context where this function comes from, for
281 // error reporting and symbol generation.
284 // The arena that blocks are allocated from.
285 block_arena: &'a TypedArena<Block<'a>>,
287 // This function's enclosing crate context.
288 ccx: &'a CrateContext,
290 // Used and maintained by the debuginfo module.
291 debug_context: debuginfo::FunctionDebugContext,
294 scopes: RefCell<Vec<cleanup::CleanupScope<'a>> >,
297 impl<'a> FunctionContext<'a> {
298 pub fn arg_pos(&self, arg: uint) -> uint {
299 let arg = self.env_arg_pos() + arg;
300 if self.llenv.is_some() {
307 pub fn out_arg_pos(&self) -> uint {
308 assert!(self.caller_expects_out_pointer);
312 pub fn env_arg_pos(&self) -> uint {
313 if self.caller_expects_out_pointer {
320 pub fn cleanup(&self) {
322 llvm::LLVMInstructionEraseFromParent(self.alloca_insert_pt
326 // Remove the cycle between fcx and bcx, so memory can be freed
327 self.entry_bcx.set(None);
330 pub fn get_llreturn(&self) -> BasicBlockRef {
331 if self.llreturn.get().is_none() {
333 self.llreturn.set(Some(unsafe {
334 "return".with_c_str(|buf| {
335 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx, self.llfn, buf)
340 self.llreturn.get().unwrap()
343 pub fn new_block(&'a self,
346 opt_node_id: Option<ast::NodeId>)
349 let llbb = name.with_c_str(|buf| {
350 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx,
354 Block::new(llbb, is_lpad, opt_node_id, self)
358 pub fn new_id_block(&'a self,
360 node_id: ast::NodeId)
362 self.new_block(false, name, Some(node_id))
365 pub fn new_temp_block(&'a self,
368 self.new_block(false, name, None)
371 pub fn join_blocks(&'a self,
373 in_cxs: &[&'a Block<'a>])
375 let out = self.new_id_block("join", id);
376 let mut reachable = false;
377 for bcx in in_cxs.iter() {
378 if !bcx.unreachable.get() {
379 build::Br(*bcx, out.llbb);
384 build::Unreachable(out);
390 // Heap selectors. Indicate which heap something should go on.
395 heap_exchange_closure
398 // Basic block context. We create a block context for each basic block
399 // (single-entry, single-exit sequence of instructions) we generate from Rust
400 // code. Each basic block we generate is attached to a function, typically
401 // with many basic blocks per function. All the basic blocks attached to a
402 // function are organized as a directed graph.
403 pub struct Block<'a> {
404 // The BasicBlockRef returned from a call to
405 // llvm::LLVMAppendBasicBlock(llfn, name), which adds a basic
406 // block to the function pointed to by llfn. We insert
407 // instructions into that block by way of this block context.
408 // The block pointing to this one in the function's digraph.
410 terminated: Cell<bool>,
411 unreachable: Cell<bool>,
413 // Is this block part of a landing pad?
416 // AST node-id associated with this block, if any. Used for
417 // debugging purposes only.
418 opt_node_id: Option<ast::NodeId>,
420 // The function context for the function to which this block is
422 fcx: &'a FunctionContext<'a>,
429 opt_node_id: Option<ast::NodeId>,
430 fcx: &'a FunctionContext<'a>)
432 fcx.block_arena.alloc(Block {
434 terminated: Cell::new(false),
435 unreachable: Cell::new(false),
437 opt_node_id: opt_node_id,
442 pub fn ccx(&self) -> &'a CrateContext { self.fcx.ccx }
443 pub fn tcx(&self) -> &'a ty::ctxt {
446 pub fn sess(&self) -> &'a Session { self.fcx.ccx.sess() }
448 pub fn ident(&self, ident: Ident) -> ~str {
449 token::get_ident(ident).get().to_str()
452 pub fn node_id_to_str(&self, id: ast::NodeId) -> ~str {
453 self.tcx().map.node_to_str(id)
456 pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
460 pub fn expr_is_lval(&self, e: &ast::Expr) -> bool {
461 ty::expr_is_lval(self.tcx(), self.ccx().maps.method_map, e)
464 pub fn expr_kind(&self, e: &ast::Expr) -> ty::ExprKind {
465 ty::expr_kind(self.tcx(), self.ccx().maps.method_map, e)
468 pub fn def(&self, nid: ast::NodeId) -> ast::Def {
469 let def_map = self.tcx().def_map.borrow();
470 match def_map.get().find(&nid) {
473 self.tcx().sess.bug(format!(
474 "no def associated with node id {:?}", nid));
479 pub fn val_to_str(&self, val: ValueRef) -> ~str {
480 self.ccx().tn.val_to_str(val)
483 pub fn llty_str(&self, ty: Type) -> ~str {
484 self.ccx().tn.type_to_str(ty)
487 pub fn ty_to_str(&self, t: ty::t) -> ~str {
491 pub fn to_str(&self) -> ~str {
492 let blk: *Block = self;
493 format!("[block {}]", blk)
497 pub struct Result<'a> {
502 pub fn rslt<'a>(bcx: &'a Block<'a>, val: ValueRef) -> Result<'a> {
509 impl<'a> Result<'a> {
510 pub fn unpack(&self, bcx: &mut &'a Block<'a>) -> ValueRef {
516 pub fn val_ty(v: ValueRef) -> Type {
518 Type::from_ref(llvm::LLVMTypeOf(v))
522 // LLVM constant constructors.
523 pub fn C_null(t: Type) -> ValueRef {
525 llvm::LLVMConstNull(t.to_ref())
529 pub fn C_undef(t: Type) -> ValueRef {
531 llvm::LLVMGetUndef(t.to_ref())
535 pub fn C_integral(t: Type, u: u64, sign_extend: bool) -> ValueRef {
537 llvm::LLVMConstInt(t.to_ref(), u, sign_extend as Bool)
541 pub fn C_floating(s: &str, t: Type) -> ValueRef {
543 s.with_c_str(|buf| llvm::LLVMConstRealOfString(t.to_ref(), buf))
547 pub fn C_nil(ccx: &CrateContext) -> ValueRef {
548 C_struct(ccx, [], false)
551 pub fn C_bool(ccx: &CrateContext, val: bool) -> ValueRef {
552 C_integral(Type::bool(ccx), val as u64, false)
555 pub fn C_i1(ccx: &CrateContext, val: bool) -> ValueRef {
556 C_integral(Type::i1(ccx), val as u64, false)
559 pub fn C_i32(ccx: &CrateContext, i: i32) -> ValueRef {
560 C_integral(Type::i32(ccx), i as u64, true)
563 pub fn C_i64(ccx: &CrateContext, i: i64) -> ValueRef {
564 C_integral(Type::i64(ccx), i as u64, true)
567 pub fn C_u64(ccx: &CrateContext, i: u64) -> ValueRef {
568 C_integral(Type::i64(ccx), i, false)
571 pub fn C_int(ccx: &CrateContext, i: int) -> ValueRef {
572 C_integral(ccx.int_type, i as u64, true)
575 pub fn C_uint(ccx: &CrateContext, i: uint) -> ValueRef {
576 C_integral(ccx.int_type, i as u64, false)
579 pub fn C_u8(ccx: &CrateContext, i: uint) -> ValueRef {
580 C_integral(Type::i8(ccx), i as u64, false)
584 // This is a 'c-like' raw string, which differs from
585 // our boxed-and-length-annotated strings.
586 pub fn C_cstr(cx: &CrateContext, s: InternedString) -> ValueRef {
589 let const_cstr_cache = cx.const_cstr_cache.borrow();
590 match const_cstr_cache.get().find(&s) {
591 Some(&llval) => return llval,
596 let sc = llvm::LLVMConstStringInContext(cx.llcx,
597 s.get().as_ptr() as *c_char,
598 s.get().len() as c_uint,
601 let gsym = token::gensym("str");
602 let g = format!("str{}", gsym).with_c_str(|buf| {
603 llvm::LLVMAddGlobal(cx.llmod, val_ty(sc).to_ref(), buf)
605 llvm::LLVMSetInitializer(g, sc);
606 llvm::LLVMSetGlobalConstant(g, True);
607 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
609 let mut const_cstr_cache = cx.const_cstr_cache.borrow_mut();
610 const_cstr_cache.get().insert(s, g);
615 // NB: Do not use `do_spill_noroot` to make this into a constant string, or
616 // you will be kicked off fast isel. See issue #4352 for an example of this.
617 pub fn C_str_slice(cx: &CrateContext, s: InternedString) -> ValueRef {
619 let len = s.get().len();
620 let cs = llvm::LLVMConstPointerCast(C_cstr(cx, s), Type::i8p(cx).to_ref());
621 C_struct(cx, [cs, C_uint(cx, len)], false)
625 pub fn C_binary_slice(cx: &CrateContext, data: &[u8]) -> ValueRef {
627 let len = data.len();
628 let lldata = C_bytes(cx, data);
630 let gsym = token::gensym("binary");
631 let g = format!("binary{}", gsym).with_c_str(|buf| {
632 llvm::LLVMAddGlobal(cx.llmod, val_ty(lldata).to_ref(), buf)
634 llvm::LLVMSetInitializer(g, lldata);
635 llvm::LLVMSetGlobalConstant(g, True);
636 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
638 let cs = llvm::LLVMConstPointerCast(g, Type::i8p(cx).to_ref());
639 C_struct(cx, [cs, C_uint(cx, len)], false)
643 pub fn C_struct(ccx: &CrateContext, elts: &[ValueRef], packed: bool) -> ValueRef {
645 llvm::LLVMConstStructInContext(ccx.llcx,
646 elts.as_ptr(), elts.len() as c_uint,
651 pub fn C_named_struct(t: Type, elts: &[ValueRef]) -> ValueRef {
653 llvm::LLVMConstNamedStruct(t.to_ref(), elts.as_ptr(), elts.len() as c_uint)
657 pub fn C_array(ty: Type, elts: &[ValueRef]) -> ValueRef {
659 return llvm::LLVMConstArray(ty.to_ref(), elts.as_ptr(), elts.len() as c_uint);
663 pub fn C_bytes(ccx: &CrateContext, bytes: &[u8]) -> ValueRef {
665 let ptr = bytes.as_ptr() as *c_char;
666 return llvm::LLVMConstStringInContext(ccx.llcx, ptr, bytes.len() as c_uint, True);
670 pub fn get_param(fndecl: ValueRef, param: uint) -> ValueRef {
672 llvm::LLVMGetParam(fndecl, param as c_uint)
676 pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
679 let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
681 debug!("const_get_elt(v={}, us={:?}, r={})",
682 cx.tn.val_to_str(v), us, cx.tn.val_to_str(r));
688 pub fn is_const(v: ValueRef) -> bool {
690 llvm::LLVMIsConstant(v) == True
694 pub fn const_to_int(v: ValueRef) -> c_longlong {
696 llvm::LLVMConstIntGetSExtValue(v)
700 pub fn const_to_uint(v: ValueRef) -> c_ulonglong {
702 llvm::LLVMConstIntGetZExtValue(v)
706 pub fn is_undef(val: ValueRef) -> bool {
708 llvm::LLVMIsUndef(val) != False
712 pub fn is_null(val: ValueRef) -> bool {
714 llvm::LLVMIsNull(val) != False
718 // Used to identify cached monomorphized functions and vtables
719 #[deriving(Eq, Hash)]
720 pub enum mono_param_id {
721 mono_precise(ty::t, Option<@Vec<mono_id> >),
723 mono_repr(uint /* size */,
729 #[deriving(Eq, Hash)]
730 pub enum MonoDataClass {
731 MonoBits, // Anything not treated differently from arbitrary integer data
732 MonoNonNull, // Non-null pointers (used for optional-pointer optimization)
733 // FIXME(#3547)---scalars and floats are
734 // treated differently in most ABIs. But we
735 // should be doing something more detailed
740 pub fn mono_data_classify(t: ty::t) -> MonoDataClass {
741 match ty::get(t).sty {
742 ty::ty_float(_) => MonoFloat,
743 ty::ty_rptr(..) | ty::ty_uniq(..) | ty::ty_box(..) |
744 ty::ty_str(ty::vstore_uniq) | ty::ty_vec(_, ty::vstore_uniq) |
745 ty::ty_bare_fn(..) => MonoNonNull,
746 // Is that everything? Would closures or slices qualify?
751 #[deriving(Eq, Hash)]
752 pub struct mono_id_ {
754 params: Vec<mono_param_id> }
756 pub type mono_id = @mono_id_;
758 pub fn umax(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
759 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
760 return build::Select(cx, cond, b, a);
763 pub fn umin(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
764 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
765 return build::Select(cx, cond, a, b);
768 pub fn align_to(cx: &Block, off: ValueRef, align: ValueRef) -> ValueRef {
769 let mask = build::Sub(cx, align, C_int(cx.ccx(), 1));
770 let bumped = build::Add(cx, off, mask);
771 return build::And(cx, bumped, build::Not(cx, mask));
774 pub fn monomorphize_type(bcx: &Block, t: ty::t) -> ty::t {
775 match bcx.fcx.param_substs {
777 ty::subst_tps(bcx.tcx(), substs.tys.as_slice(), substs.self_ty, t)
780 assert!(!ty::type_has_params(t));
781 assert!(!ty::type_has_self(t));
787 pub fn node_id_type(bcx: &Block, id: ast::NodeId) -> ty::t {
789 let t = ty::node_id_to_type(tcx, id);
790 monomorphize_type(bcx, t)
793 pub fn expr_ty(bcx: &Block, ex: &ast::Expr) -> ty::t {
794 node_id_type(bcx, ex.id)
797 pub fn expr_ty_adjusted(bcx: &Block, ex: &ast::Expr) -> ty::t {
799 let t = ty::expr_ty_adjusted(tcx, ex, bcx.ccx().maps.method_map.borrow().get());
800 monomorphize_type(bcx, t)
803 // Key used to lookup values supplied for type parameters in an expr.
805 pub enum ExprOrMethodCall {
806 // Type parameters for a path like `None::<int>`
809 // Type parameters for a method call like `a.foo::<int>()`
810 MethodCall(typeck::MethodCall)
813 pub fn node_id_type_params(bcx: &Block, node: ExprOrMethodCall) -> Vec<ty::t> {
815 let params = match node {
816 ExprId(id) => ty::node_id_to_type_params(tcx, id),
817 MethodCall(method_call) => {
818 bcx.ccx().maps.method_map.borrow().get().get(&method_call).substs.tps.clone()
822 if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
824 format!("type parameters for node {:?} include inference types: {}",
825 node, params.map(|t| bcx.ty_to_str(*t)).connect(",")));
828 match bcx.fcx.param_substs {
830 params.iter().map(|t| {
831 ty::subst_tps(tcx, substs.tys.as_slice(), substs.self_ty, *t)
838 pub fn node_vtables(bcx: &Block, id: ast::NodeId)
839 -> Option<typeck::vtable_res> {
840 let vtable_map = bcx.ccx().maps.vtable_map.borrow();
841 let raw_vtables = vtable_map.get().find(&id);
842 raw_vtables.map(|vts| resolve_vtables_in_fn_ctxt(bcx.fcx, *vts))
845 // Apply the typaram substitutions in the FunctionContext to some
846 // vtables. This should eliminate any vtable_params.
847 pub fn resolve_vtables_in_fn_ctxt(fcx: &FunctionContext, vts: typeck::vtable_res)
848 -> typeck::vtable_res {
849 resolve_vtables_under_param_substs(fcx.ccx.tcx(),
854 pub fn resolve_vtables_under_param_substs(tcx: &ty::ctxt,
855 param_substs: Option<@param_substs>,
856 vts: typeck::vtable_res)
857 -> typeck::vtable_res {
859 resolve_param_vtables_under_param_substs(tcx,
865 pub fn resolve_param_vtables_under_param_substs(
867 param_substs: Option<@param_substs>,
868 ds: typeck::vtable_param_res)
869 -> typeck::vtable_param_res {
871 |d| resolve_vtable_under_param_substs(tcx,
879 pub fn resolve_vtable_under_param_substs(tcx: &ty::ctxt,
880 param_substs: Option<@param_substs>,
881 vt: &typeck::vtable_origin)
882 -> typeck::vtable_origin {
884 typeck::vtable_static(trait_id, ref tys, sub) => {
885 let tys = match param_substs {
889 substs.tys.as_slice(),
894 _ => Vec::from_slice(tys.as_slice())
896 typeck::vtable_static(
898 resolve_vtables_under_param_substs(tcx, param_substs, sub))
900 typeck::vtable_param(n_param, n_bound) => {
903 find_vtable(tcx, substs, n_param, n_bound)
906 tcx.sess.bug(format!(
907 "resolve_vtable_under_param_substs: asked to lookup \
908 but no vtables in the fn_ctxt!"))
915 pub fn find_vtable(tcx: &ty::ctxt,
917 n_param: typeck::param_index,
919 -> typeck::vtable_origin {
920 debug!("find_vtable(n_param={:?}, n_bound={}, ps={})",
921 n_param, n_bound, ps.repr(tcx));
923 let param_bounds = match n_param {
924 typeck::param_self => ps.self_vtables.expect("self vtables missing"),
925 typeck::param_numbered(n) => {
926 let tables = ps.vtables
927 .expect("vtables missing where they are needed");
931 param_bounds.get(n_bound).clone()
934 pub fn dummy_substs(tps: Vec<ty::t> ) -> ty::substs {
936 regions: ty::ErasedRegions,
942 pub fn filename_and_line_num_from_span(bcx: &Block, span: Span)
943 -> (ValueRef, ValueRef) {
944 let loc = bcx.sess().codemap().lookup_char_pos(span.lo);
945 let filename_cstr = C_cstr(bcx.ccx(),
946 token::intern_and_get_ident(loc.file.deref().name));
947 let filename = build::PointerCast(bcx, filename_cstr, Type::i8p(bcx.ccx()));
948 let line = C_int(bcx.ccx(), loc.line as int);
952 // Casts a Rust bool value to an i1.
953 pub fn bool_to_i1(bcx: &Block, llval: ValueRef) -> ValueRef {
954 build::ICmp(bcx, lib::llvm::IntNE, llval, C_bool(bcx.ccx(), false))
957 pub fn langcall(bcx: &Block,
962 match bcx.tcx().lang_items.require(li) {
965 let msg = format!("{} {}", msg, s);
967 Some(span) => { bcx.tcx().sess.span_fatal(span, msg); }
968 None => { bcx.tcx().sess.fatal(msg); }