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::base;
22 use middle::trans::build;
23 use middle::trans::cleanup;
24 use middle::trans::datum;
25 use middle::trans::datum::{Datum, Lvalue};
26 use middle::trans::debuginfo;
27 use middle::trans::type_::Type;
28 use middle::ty::substs;
31 use util::ppaux::Repr;
32 use util::nodemap::NodeMap;
34 use arena::TypedArena;
35 use std::c_str::ToCStr;
36 use std::cell::{Cell, RefCell};
37 use collections::HashMap;
38 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[0].ident.name == token::special_idents::unnamed_field.name &&
54 type_is_immediate(ccx, fields[0].mt.ty)
60 pub fn type_is_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
61 use middle::trans::machine::llsize_of_alloc;
62 use middle::trans::type_of::sizing_type_of;
64 let simple = ty::type_is_scalar(ty) || ty::type_is_boxed(ty) ||
65 ty::type_is_unique(ty) || ty::type_is_region_ptr(ty) ||
66 type_is_newtype_immediate(ccx, ty) || ty::type_is_bot(ty) ||
67 ty::type_is_simd(tcx, ty);
71 match ty::get(ty).sty {
73 ty::ty_struct(..) | ty::ty_enum(..) | ty::ty_tup(..) => {
74 let llty = sizing_type_of(ccx, ty);
75 llsize_of_alloc(ccx, llty) <= llsize_of_alloc(ccx, ccx.int_type)
77 _ => type_is_zero_size(ccx, ty)
81 pub fn type_is_zero_size(ccx: &CrateContext, ty: ty::t) -> bool {
83 * Identify types which have size zero at runtime.
86 use middle::trans::machine::llsize_of_alloc;
87 use middle::trans::type_of::sizing_type_of;
88 let llty = sizing_type_of(ccx, ty);
89 llsize_of_alloc(ccx, llty) == 0
92 pub fn return_type_is_void(ccx: &CrateContext, ty: ty::t) -> bool {
94 * Identifies types which we declare to be equivalent to `void`
95 * in C for the purpose of function return types. These are
96 * `()`, bot, and uninhabited enums. Note that all such types
97 * are also zero-size, but not all zero-size types use a `void`
98 * return type (in order to aid with C ABI compatibility).
101 ty::type_is_nil(ty) || ty::type_is_bot(ty) || ty::type_is_empty(ccx.tcx, ty)
104 pub fn gensym_name(name: &str) -> PathElem {
105 PathName(token::gensym(name))
108 pub struct tydesc_info {
114 visit_glue: Cell<Option<ValueRef>>,
118 * A note on nomenclature of linking: "extern", "foreign", and "upcall".
120 * An "extern" is an LLVM symbol we wind up emitting an undefined external
121 * reference to. This means "we don't have the thing in this compilation unit,
122 * please make sure you link it in at runtime". This could be a reference to
123 * C code found in a C library, or rust code found in a rust crate.
125 * Most "externs" are implicitly declared (automatically) as a result of a
126 * user declaring an extern _module_ dependency; this causes the rust driver
127 * to locate an extern crate, scan its compilation metadata, and emit extern
128 * declarations for any symbols used by the declaring crate.
130 * A "foreign" is an extern that references C (or other non-rust ABI) code.
131 * There is no metadata to scan for extern references so in these cases either
132 * a header-digester like bindgen, or manual function prototypes, have to
133 * serve as declarators. So these are usually given explicitly as prototype
134 * declarations, in rust code, with ABI attributes on them noting which ABI to
137 * An "upcall" is a foreign call generated by the compiler (not corresponding
138 * to any user-written call in the code) into the runtime library, to perform
139 * some helper task such as bringing a task to life, allocating memory, etc.
143 pub struct NodeInfo {
148 pub fn expr_info(expr: &ast::Expr) -> NodeInfo {
149 NodeInfo { id: expr.id, span: expr.span }
153 n_static_tydescs: Cell<uint>,
154 n_glues_created: Cell<uint>,
155 n_null_glues: Cell<uint>,
156 n_real_glues: Cell<uint>,
159 n_inlines: Cell<uint>,
160 n_closures: Cell<uint>,
161 n_llvm_insns: Cell<uint>,
162 llvm_insns: RefCell<HashMap<~str, uint>>,
163 // (ident, time-in-ms, llvm-instructions)
164 fn_stats: RefCell<~[(~str, uint, uint)]>,
167 pub struct BuilderRef_res {
171 impl Drop for BuilderRef_res {
174 llvm::LLVMDisposeBuilder(self.b);
179 pub fn BuilderRef_res(b: BuilderRef) -> BuilderRef_res {
185 pub type ExternMap = HashMap<~str, ValueRef>;
187 // Here `self_ty` is the real type of the self parameter to this method. It
188 // will only be set in the case of default methods.
189 pub struct param_substs {
191 self_ty: Option<ty::t>,
192 vtables: Option<typeck::vtable_res>,
193 self_vtables: Option<typeck::vtable_param_res>
197 pub fn validate(&self) {
198 for t in self.tys.iter() { assert!(!ty::type_needs_infer(*t)); }
199 for t in self.self_ty.iter() { assert!(!ty::type_needs_infer(*t)); }
203 fn param_substs_to_str(this: ¶m_substs, tcx: ty::ctxt) -> ~str {
204 format!("param_substs \\{tys:{}, vtables:{}\\}",
206 this.vtables.repr(tcx))
209 impl Repr for param_substs {
210 fn repr(&self, tcx: ty::ctxt) -> ~str {
211 param_substs_to_str(self, tcx)
215 // work around bizarre resolve errors
216 pub type RvalueDatum = datum::Datum<datum::Rvalue>;
217 pub type LvalueDatum = datum::Datum<datum::Lvalue>;
219 // Function context. Every LLVM function we create will have one of
221 pub struct FunctionContext<'a> {
222 // The ValueRef returned from a call to llvm::LLVMAddFunction; the
223 // address of the first instruction in the sequence of
224 // instructions for this function that will go in the .text
225 // section of the executable we're generating.
228 // The environment argument in a closure.
229 llenv: Option<ValueRef>,
231 // The place to store the return value. If the return type is immediate,
232 // this is an alloca in the function. Otherwise, it's the hidden first
233 // parameter to the function. After function construction, this should
235 llretptr: Cell<Option<ValueRef>>,
237 entry_bcx: RefCell<Option<&'a Block<'a>>>,
239 // These elements: "hoisted basic blocks" containing
240 // administrative activities that have to happen in only one place in
241 // the function, due to LLVM's quirks.
242 // A marker for the place where we want to insert the function's static
243 // allocas, so that LLVM will coalesce them into a single alloca call.
244 alloca_insert_pt: Cell<Option<ValueRef>>,
245 llreturn: Cell<Option<BasicBlockRef>>,
247 // The a value alloca'd for calls to upcalls.rust_personality. Used when
248 // outputting the resume instruction.
249 personality: Cell<Option<ValueRef>>,
251 // True if the caller expects this fn to use the out pointer to
252 // return. Either way, your code should write into llretptr, but if
253 // this value is false, llretptr will be a local alloca.
254 caller_expects_out_pointer: bool,
256 // Maps arguments to allocas created for them in llallocas.
257 llargs: RefCell<NodeMap<LvalueDatum>>,
259 // Maps the def_ids for local variables to the allocas created for
260 // them in llallocas.
261 lllocals: RefCell<NodeMap<LvalueDatum>>,
263 // Same as above, but for closure upvars
264 llupvars: RefCell<NodeMap<ValueRef>>,
266 // The NodeId of the function, or -1 if it doesn't correspond to
267 // a user-defined function.
270 // If this function is being monomorphized, this contains the type
271 // substitutions used.
272 param_substs: Option<@param_substs>,
274 // The source span and nesting context where this function comes from, for
275 // error reporting and symbol generation.
278 // The arena that blocks are allocated from.
279 block_arena: &'a TypedArena<Block<'a>>,
281 // This function's enclosing crate context.
284 // Used and maintained by the debuginfo module.
285 debug_context: debuginfo::FunctionDebugContext,
288 scopes: RefCell<~[cleanup::CleanupScope<'a>]>,
291 impl<'a> FunctionContext<'a> {
292 pub fn arg_pos(&self, arg: uint) -> uint {
293 let arg = self.env_arg_pos() + arg;
294 if self.llenv.is_some() {
301 pub fn out_arg_pos(&self) -> uint {
302 assert!(self.caller_expects_out_pointer);
306 pub fn env_arg_pos(&self) -> uint {
307 if self.caller_expects_out_pointer {
314 pub fn cleanup(&self) {
316 llvm::LLVMInstructionEraseFromParent(self.alloca_insert_pt
320 // Remove the cycle between fcx and bcx, so memory can be freed
321 self.entry_bcx.set(None);
324 pub fn get_llreturn(&self) -> BasicBlockRef {
325 if self.llreturn.get().is_none() {
326 self.llreturn.set(Some(base::mk_return_basic_block(self.llfn)));
329 self.llreturn.get().unwrap()
332 pub fn new_block(&'a self,
335 opt_node_id: Option<ast::NodeId>)
338 let llbb = name.with_c_str(|buf| {
339 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx,
343 Block::new(llbb, is_lpad, opt_node_id, self)
347 pub fn new_id_block(&'a self,
349 node_id: ast::NodeId)
351 self.new_block(false, name, Some(node_id))
354 pub fn new_temp_block(&'a self,
357 self.new_block(false, name, None)
360 pub fn join_blocks(&'a self,
362 in_cxs: &[&'a Block<'a>])
364 let out = self.new_id_block("join", id);
365 let mut reachable = false;
366 for bcx in in_cxs.iter() {
367 if !bcx.unreachable.get() {
368 build::Br(*bcx, out.llbb);
373 build::Unreachable(out);
379 pub fn warn_not_to_commit(ccx: &mut CrateContext, msg: &str) {
380 if !ccx.do_not_commit_warning_issued.get() {
381 ccx.do_not_commit_warning_issued.set(true);
382 ccx.sess.warn(msg.to_str() + " -- do not commit like this!");
386 // Heap selectors. Indicate which heap something should go on.
391 heap_exchange_closure
394 // Basic block context. We create a block context for each basic block
395 // (single-entry, single-exit sequence of instructions) we generate from Rust
396 // code. Each basic block we generate is attached to a function, typically
397 // with many basic blocks per function. All the basic blocks attached to a
398 // function are organized as a directed graph.
399 pub struct Block<'a> {
400 // The BasicBlockRef returned from a call to
401 // llvm::LLVMAppendBasicBlock(llfn, name), which adds a basic
402 // block to the function pointed to by llfn. We insert
403 // instructions into that block by way of this block context.
404 // The block pointing to this one in the function's digraph.
406 terminated: Cell<bool>,
407 unreachable: Cell<bool>,
409 // Is this block part of a landing pad?
412 // AST node-id associated with this block, if any. Used for
413 // debugging purposes only.
414 opt_node_id: Option<ast::NodeId>,
416 // The function context for the function to which this block is
418 fcx: &'a FunctionContext<'a>,
425 opt_node_id: Option<ast::NodeId>,
426 fcx: &'a FunctionContext<'a>)
428 fcx.block_arena.alloc(Block {
430 terminated: Cell::new(false),
431 unreachable: Cell::new(false),
433 opt_node_id: opt_node_id,
438 pub fn ccx(&self) -> @CrateContext { self.fcx.ccx }
439 pub fn tcx(&self) -> ty::ctxt {
442 pub fn sess(&self) -> Session { self.fcx.ccx.sess }
444 pub fn ident(&self, ident: Ident) -> ~str {
445 token::get_ident(ident).get().to_str()
448 pub fn node_id_to_str(&self, id: ast::NodeId) -> ~str {
449 self.tcx().map.node_to_str(id)
452 pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
456 pub fn expr_is_lval(&self, e: &ast::Expr) -> bool {
457 ty::expr_is_lval(self.tcx(), self.ccx().maps.method_map, e)
460 pub fn expr_kind(&self, e: &ast::Expr) -> ty::ExprKind {
461 ty::expr_kind(self.tcx(), self.ccx().maps.method_map, e)
464 pub fn def(&self, nid: ast::NodeId) -> ast::Def {
465 let def_map = self.tcx().def_map.borrow();
466 match def_map.get().find(&nid) {
469 self.tcx().sess.bug(format!(
470 "no def associated with node id {:?}", nid));
475 pub fn val_to_str(&self, val: ValueRef) -> ~str {
476 self.ccx().tn.val_to_str(val)
479 pub fn llty_str(&self, ty: Type) -> ~str {
480 self.ccx().tn.type_to_str(ty)
483 pub fn ty_to_str(&self, t: ty::t) -> ~str {
487 pub fn to_str(&self) -> ~str {
488 let blk: *Block = self;
489 format!("[block {}]", blk)
493 pub struct Result<'a> {
498 pub fn rslt<'a>(bcx: &'a Block<'a>, val: ValueRef) -> Result<'a> {
505 impl<'a> Result<'a> {
506 pub fn unpack(&self, bcx: &mut &'a Block<'a>) -> ValueRef {
512 pub fn val_ty(v: ValueRef) -> Type {
514 Type::from_ref(llvm::LLVMTypeOf(v))
518 // LLVM constant constructors.
519 pub fn C_null(t: Type) -> ValueRef {
521 llvm::LLVMConstNull(t.to_ref())
525 pub fn C_undef(t: Type) -> ValueRef {
527 llvm::LLVMGetUndef(t.to_ref())
531 pub fn C_integral(t: Type, u: u64, sign_extend: bool) -> ValueRef {
533 llvm::LLVMConstInt(t.to_ref(), u, sign_extend as Bool)
537 pub fn C_floating(s: &str, t: Type) -> ValueRef {
539 s.with_c_str(|buf| llvm::LLVMConstRealOfString(t.to_ref(), buf))
543 pub fn C_nil() -> ValueRef {
547 pub fn C_bool(val: bool) -> ValueRef {
548 C_integral(Type::bool(), val as u64, false)
551 pub fn C_i1(val: bool) -> ValueRef {
552 C_integral(Type::i1(), val as u64, false)
555 pub fn C_i32(i: i32) -> ValueRef {
556 return C_integral(Type::i32(), i as u64, true);
559 pub fn C_i64(i: i64) -> ValueRef {
560 return C_integral(Type::i64(), i as u64, true);
563 pub fn C_u64(i: u64) -> ValueRef {
564 return C_integral(Type::i64(), i, false);
567 pub fn C_int(cx: &CrateContext, i: int) -> ValueRef {
568 return C_integral(cx.int_type, i as u64, true);
571 pub fn C_uint(cx: &CrateContext, i: uint) -> ValueRef {
572 return C_integral(cx.int_type, i as u64, false);
575 pub fn C_u8(i: uint) -> ValueRef {
576 return C_integral(Type::i8(), i as u64, false);
580 // This is a 'c-like' raw string, which differs from
581 // our boxed-and-length-annotated strings.
582 pub fn C_cstr(cx: &CrateContext, s: InternedString) -> ValueRef {
585 let const_cstr_cache = cx.const_cstr_cache.borrow();
586 match const_cstr_cache.get().find(&s) {
587 Some(&llval) => return llval,
592 let sc = llvm::LLVMConstStringInContext(cx.llcx,
593 s.get().as_ptr() as *c_char,
594 s.get().len() as c_uint,
597 let gsym = token::gensym("str");
598 let g = format!("str{}", gsym).with_c_str(|buf| {
599 llvm::LLVMAddGlobal(cx.llmod, val_ty(sc).to_ref(), buf)
601 llvm::LLVMSetInitializer(g, sc);
602 llvm::LLVMSetGlobalConstant(g, True);
603 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
605 let mut const_cstr_cache = cx.const_cstr_cache.borrow_mut();
606 const_cstr_cache.get().insert(s, g);
611 // NB: Do not use `do_spill_noroot` to make this into a constant string, or
612 // you will be kicked off fast isel. See issue #4352 for an example of this.
613 pub fn C_str_slice(cx: &CrateContext, s: InternedString) -> ValueRef {
615 let len = s.get().len();
616 let cs = llvm::LLVMConstPointerCast(C_cstr(cx, s), Type::i8p().to_ref());
617 C_struct([cs, C_uint(cx, len)], false)
621 pub fn C_binary_slice(cx: &CrateContext, data: &[u8]) -> ValueRef {
623 let len = data.len();
624 let lldata = C_bytes(data);
626 let gsym = token::gensym("binary");
627 let g = format!("binary{}", gsym).with_c_str(|buf| {
628 llvm::LLVMAddGlobal(cx.llmod, val_ty(lldata).to_ref(), buf)
630 llvm::LLVMSetInitializer(g, lldata);
631 llvm::LLVMSetGlobalConstant(g, True);
632 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
634 let cs = llvm::LLVMConstPointerCast(g, Type::i8p().to_ref());
635 C_struct([cs, C_uint(cx, len)], false)
639 pub fn C_zero_byte_arr(size: uint) -> ValueRef {
642 let mut elts: ~[ValueRef] = ~[];
643 while i < size { elts.push(C_u8(0u)); i += 1u; }
644 return llvm::LLVMConstArray(Type::i8().to_ref(),
645 elts.as_ptr(), elts.len() as c_uint);
649 pub fn C_struct(elts: &[ValueRef], packed: bool) -> ValueRef {
652 llvm::LLVMConstStructInContext(base::task_llcx(),
653 elts.as_ptr(), elts.len() as c_uint,
658 pub fn C_named_struct(t: Type, elts: &[ValueRef]) -> ValueRef {
660 llvm::LLVMConstNamedStruct(t.to_ref(), elts.as_ptr(), elts.len() as c_uint)
664 pub fn C_array(ty: Type, elts: &[ValueRef]) -> ValueRef {
666 return llvm::LLVMConstArray(ty.to_ref(), elts.as_ptr(), elts.len() as c_uint);
670 pub fn C_bytes(bytes: &[u8]) -> ValueRef {
672 let ptr = bytes.as_ptr() as *c_char;
673 return llvm::LLVMConstStringInContext(base::task_llcx(), ptr, bytes.len() as c_uint, True);
677 pub fn get_param(fndecl: ValueRef, param: uint) -> ValueRef {
679 llvm::LLVMGetParam(fndecl, param as c_uint)
683 pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
686 let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
688 debug!("const_get_elt(v={}, us={:?}, r={})",
689 cx.tn.val_to_str(v), us, cx.tn.val_to_str(r));
695 pub fn is_const(v: ValueRef) -> bool {
697 llvm::LLVMIsConstant(v) == True
701 pub fn const_to_int(v: ValueRef) -> c_longlong {
703 llvm::LLVMConstIntGetSExtValue(v)
707 pub fn const_to_uint(v: ValueRef) -> c_ulonglong {
709 llvm::LLVMConstIntGetZExtValue(v)
713 pub fn is_undef(val: ValueRef) -> bool {
715 llvm::LLVMIsUndef(val) != False
719 pub fn is_null(val: ValueRef) -> bool {
721 llvm::LLVMIsNull(val) != False
725 // Used to identify cached monomorphized functions and vtables
726 #[deriving(Eq, Hash)]
727 pub enum mono_param_id {
728 mono_precise(ty::t, Option<@~[mono_id]>),
730 mono_repr(uint /* size */,
736 #[deriving(Eq, Hash)]
737 pub enum MonoDataClass {
738 MonoBits, // Anything not treated differently from arbitrary integer data
739 MonoNonNull, // Non-null pointers (used for optional-pointer optimization)
740 // FIXME(#3547)---scalars and floats are
741 // treated differently in most ABIs. But we
742 // should be doing something more detailed
747 pub fn mono_data_classify(t: ty::t) -> MonoDataClass {
748 match ty::get(t).sty {
749 ty::ty_float(_) => MonoFloat,
750 ty::ty_rptr(..) | ty::ty_uniq(..) | ty::ty_box(..) |
751 ty::ty_str(ty::vstore_uniq) | ty::ty_vec(_, ty::vstore_uniq) |
752 ty::ty_bare_fn(..) => MonoNonNull,
753 // Is that everything? Would closures or slices qualify?
758 #[deriving(Eq, Hash)]
759 pub struct mono_id_ {
761 params: ~[mono_param_id]
764 pub type mono_id = @mono_id_;
766 pub fn umax(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
767 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
768 return build::Select(cx, cond, b, a);
771 pub fn umin(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
772 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
773 return build::Select(cx, cond, a, b);
776 pub fn align_to(cx: &Block, off: ValueRef, align: ValueRef) -> ValueRef {
777 let mask = build::Sub(cx, align, C_int(cx.ccx(), 1));
778 let bumped = build::Add(cx, off, mask);
779 return build::And(cx, bumped, build::Not(cx, mask));
782 pub fn monomorphize_type(bcx: &Block, t: ty::t) -> ty::t {
783 match bcx.fcx.param_substs {
785 ty::subst_tps(bcx.tcx(), substs.tys, substs.self_ty, t)
788 assert!(!ty::type_has_params(t));
789 assert!(!ty::type_has_self(t));
795 pub fn node_id_type(bcx: &Block, id: ast::NodeId) -> ty::t {
797 let t = ty::node_id_to_type(tcx, id);
798 monomorphize_type(bcx, t)
801 pub fn expr_ty(bcx: &Block, ex: &ast::Expr) -> ty::t {
802 node_id_type(bcx, ex.id)
805 pub fn expr_ty_adjusted(bcx: &Block, ex: &ast::Expr) -> ty::t {
807 let t = ty::expr_ty_adjusted(tcx, ex);
808 monomorphize_type(bcx, t)
811 pub fn node_id_type_params(bcx: &Block, id: ast::NodeId, is_method: bool) -> ~[ty::t] {
813 let params = if is_method {
814 bcx.ccx().maps.method_map.borrow().get().get(&id).substs.tps.clone()
816 ty::node_id_to_type_params(tcx, id)
819 if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
821 format!("type parameters for node {} include inference types: {}",
822 id, params.map(|t| bcx.ty_to_str(*t)).connect(",")));
825 match bcx.fcx.param_substs {
827 params.iter().map(|t| {
828 ty::subst_tps(tcx, substs.tys, substs.self_ty, *t)
835 pub fn node_vtables(bcx: &Block, id: ast::NodeId)
836 -> Option<typeck::vtable_res> {
837 let vtable_map = bcx.ccx().maps.vtable_map.borrow();
838 let raw_vtables = vtable_map.get().find(&id);
839 raw_vtables.map(|vts| resolve_vtables_in_fn_ctxt(bcx.fcx, *vts))
842 // Apply the typaram substitutions in the FunctionContext to some
843 // vtables. This should eliminate any vtable_params.
844 pub fn resolve_vtables_in_fn_ctxt(fcx: &FunctionContext, vts: typeck::vtable_res)
845 -> typeck::vtable_res {
846 resolve_vtables_under_param_substs(fcx.ccx.tcx,
851 pub fn resolve_vtables_under_param_substs(tcx: ty::ctxt,
852 param_substs: Option<@param_substs>,
853 vts: typeck::vtable_res)
854 -> typeck::vtable_res {
856 resolve_param_vtables_under_param_substs(tcx,
862 pub fn resolve_param_vtables_under_param_substs(
864 param_substs: Option<@param_substs>,
865 ds: typeck::vtable_param_res)
866 -> typeck::vtable_param_res {
868 |d| resolve_vtable_under_param_substs(tcx,
876 pub fn resolve_vtable_under_param_substs(tcx: ty::ctxt,
877 param_substs: Option<@param_substs>,
878 vt: &typeck::vtable_origin)
879 -> typeck::vtable_origin {
881 typeck::vtable_static(trait_id, ref tys, sub) => {
882 let tys = match param_substs {
885 ty::subst_tps(tcx, substs.tys, substs.self_ty, *t)
890 typeck::vtable_static(
892 resolve_vtables_under_param_substs(tcx, param_substs, sub))
894 typeck::vtable_param(n_param, n_bound) => {
897 find_vtable(tcx, substs, n_param, n_bound)
900 tcx.sess.bug(format!(
901 "resolve_vtable_under_param_substs: asked to lookup \
902 but no vtables in the fn_ctxt!"))
909 pub fn find_vtable(tcx: ty::ctxt,
911 n_param: typeck::param_index,
913 -> typeck::vtable_origin {
914 debug!("find_vtable(n_param={:?}, n_bound={}, ps={})",
915 n_param, n_bound, ps.repr(tcx));
917 let param_bounds = match n_param {
918 typeck::param_self => ps.self_vtables.expect("self vtables missing"),
919 typeck::param_numbered(n) => {
920 let tables = ps.vtables
921 .expect("vtables missing where they are needed");
925 param_bounds[n_bound].clone()
928 pub fn dummy_substs(tps: ~[ty::t]) -> ty::substs {
930 regions: ty::ErasedRegions,
936 pub fn filename_and_line_num_from_span(bcx: &Block, span: Span)
937 -> (ValueRef, ValueRef) {
938 let loc = bcx.sess().parse_sess.cm.lookup_char_pos(span.lo);
939 let filename_cstr = C_cstr(bcx.ccx(),
940 token::intern_and_get_ident(loc.file.name));
941 let filename = build::PointerCast(bcx, filename_cstr, Type::i8p());
942 let line = C_int(bcx.ccx(), loc.line as int);
946 // Casts a Rust bool value to an i1.
947 pub fn bool_to_i1(bcx: &Block, llval: ValueRef) -> ValueRef {
948 build::ICmp(bcx, lib::llvm::IntNE, llval, C_bool(false))
951 pub fn langcall(bcx: &Block,
956 match bcx.tcx().lang_items.require(li) {
959 let msg = format!("{} {}", msg, s);
961 Some(span) => { bcx.tcx().sess.span_fatal(span, msg); }
962 None => { bcx.tcx().sess.fatal(msg); }