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};
38 use syntax::ast::Ident;
40 use syntax::ast_map::{PathElem, PathName};
41 use syntax::codemap::Span;
42 use syntax::parse::token::InternedString;
43 use syntax::parse::token;
45 pub use middle::trans::context::CrateContext;
47 fn type_is_newtype_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
48 match ty::get(ty).sty {
49 ty::ty_struct(def_id, ref substs) => {
50 let fields = ty::struct_fields(ccx.tcx(), def_id, substs);
52 fields.get(0).ident.name ==
53 token::special_idents::unnamed_field.name &&
54 type_is_immediate(ccx, fields.get(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 /// Generates a unique symbol based off the name given. This is used to create
105 /// unique symbols for things like closures.
106 pub fn gensym_name(name: &str) -> PathElem {
107 let num = token::gensym(name);
108 // use one colon which will get translated to a period by the mangler, and
109 // we're guaranteed that `num` is globally unique for this crate.
110 PathName(token::gensym(format!("{}:{}", name, num)))
113 pub struct tydesc_info {
119 visit_glue: Cell<Option<ValueRef>>,
123 * A note on nomenclature of linking: "extern", "foreign", and "upcall".
125 * An "extern" is an LLVM symbol we wind up emitting an undefined external
126 * reference to. This means "we don't have the thing in this compilation unit,
127 * please make sure you link it in at runtime". This could be a reference to
128 * C code found in a C library, or rust code found in a rust crate.
130 * Most "externs" are implicitly declared (automatically) as a result of a
131 * user declaring an extern _module_ dependency; this causes the rust driver
132 * to locate an extern crate, scan its compilation metadata, and emit extern
133 * declarations for any symbols used by the declaring crate.
135 * A "foreign" is an extern that references C (or other non-rust ABI) code.
136 * There is no metadata to scan for extern references so in these cases either
137 * a header-digester like bindgen, or manual function prototypes, have to
138 * serve as declarators. So these are usually given explicitly as prototype
139 * declarations, in rust code, with ABI attributes on them noting which ABI to
142 * An "upcall" is a foreign call generated by the compiler (not corresponding
143 * to any user-written call in the code) into the runtime library, to perform
144 * some helper task such as bringing a task to life, allocating memory, etc.
148 pub struct NodeInfo {
153 pub fn expr_info(expr: &ast::Expr) -> NodeInfo {
154 NodeInfo { id: expr.id, span: expr.span }
158 n_static_tydescs: Cell<uint>,
159 n_glues_created: Cell<uint>,
160 n_null_glues: Cell<uint>,
161 n_real_glues: Cell<uint>,
164 n_inlines: Cell<uint>,
165 n_closures: Cell<uint>,
166 n_llvm_insns: Cell<uint>,
167 llvm_insns: RefCell<HashMap<~str, uint>>,
168 // (ident, time-in-ms, llvm-instructions)
169 fn_stats: RefCell<Vec<(~str, uint, uint)> >,
172 pub struct BuilderRef_res {
176 impl Drop for BuilderRef_res {
179 llvm::LLVMDisposeBuilder(self.b);
184 pub fn BuilderRef_res(b: BuilderRef) -> BuilderRef_res {
190 pub type ExternMap = HashMap<~str, ValueRef>;
192 // Here `self_ty` is the real type of the self parameter to this method. It
193 // will only be set in the case of default methods.
194 pub struct param_substs {
196 self_ty: Option<ty::t>,
197 vtables: Option<typeck::vtable_res>,
198 self_vtables: Option<typeck::vtable_param_res>
202 pub fn validate(&self) {
203 for t in self.tys.iter() { assert!(!ty::type_needs_infer(*t)); }
204 for t in self.self_ty.iter() { assert!(!ty::type_needs_infer(*t)); }
208 fn param_substs_to_str(this: ¶m_substs, tcx: &ty::ctxt) -> ~str {
209 format!("param_substs \\{tys:{}, vtables:{}\\}",
211 this.vtables.repr(tcx))
214 impl Repr for param_substs {
215 fn repr(&self, tcx: &ty::ctxt) -> ~str {
216 param_substs_to_str(self, tcx)
220 // work around bizarre resolve errors
221 pub type RvalueDatum = datum::Datum<datum::Rvalue>;
222 pub type LvalueDatum = datum::Datum<datum::Lvalue>;
224 // Function context. Every LLVM function we create will have one of
226 pub struct FunctionContext<'a> {
227 // The ValueRef returned from a call to llvm::LLVMAddFunction; the
228 // address of the first instruction in the sequence of
229 // instructions for this function that will go in the .text
230 // section of the executable we're generating.
233 // The environment argument in a closure.
234 llenv: Option<ValueRef>,
236 // The place to store the return value. If the return type is immediate,
237 // this is an alloca in the function. Otherwise, it's the hidden first
238 // parameter to the function. After function construction, this should
240 llretptr: Cell<Option<ValueRef>>,
242 entry_bcx: RefCell<Option<&'a Block<'a>>>,
244 // These elements: "hoisted basic blocks" containing
245 // administrative activities that have to happen in only one place in
246 // the function, due to LLVM's quirks.
247 // A marker for the place where we want to insert the function's static
248 // allocas, so that LLVM will coalesce them into a single alloca call.
249 alloca_insert_pt: Cell<Option<ValueRef>>,
250 llreturn: Cell<Option<BasicBlockRef>>,
252 // The a value alloca'd for calls to upcalls.rust_personality. Used when
253 // outputting the resume instruction.
254 personality: Cell<Option<ValueRef>>,
256 // True if the caller expects this fn to use the out pointer to
257 // return. Either way, your code should write into llretptr, but if
258 // this value is false, llretptr will be a local alloca.
259 caller_expects_out_pointer: bool,
261 // Maps arguments to allocas created for them in llallocas.
262 llargs: RefCell<NodeMap<LvalueDatum>>,
264 // Maps the def_ids for local variables to the allocas created for
265 // them in llallocas.
266 lllocals: RefCell<NodeMap<LvalueDatum>>,
268 // Same as above, but for closure upvars
269 llupvars: RefCell<NodeMap<ValueRef>>,
271 // The NodeId of the function, or -1 if it doesn't correspond to
272 // a user-defined function.
275 // If this function is being monomorphized, this contains the type
276 // substitutions used.
277 param_substs: Option<@param_substs>,
279 // The source span and nesting context where this function comes from, for
280 // error reporting and symbol generation.
283 // The arena that blocks are allocated from.
284 block_arena: &'a TypedArena<Block<'a>>,
286 // This function's enclosing crate context.
287 ccx: &'a CrateContext,
289 // Used and maintained by the debuginfo module.
290 debug_context: debuginfo::FunctionDebugContext,
293 scopes: RefCell<Vec<cleanup::CleanupScope<'a>> >,
296 impl<'a> FunctionContext<'a> {
297 pub fn arg_pos(&self, arg: uint) -> uint {
298 let arg = self.env_arg_pos() + arg;
299 if self.llenv.is_some() {
306 pub fn out_arg_pos(&self) -> uint {
307 assert!(self.caller_expects_out_pointer);
311 pub fn env_arg_pos(&self) -> uint {
312 if self.caller_expects_out_pointer {
319 pub fn cleanup(&self) {
321 llvm::LLVMInstructionEraseFromParent(self.alloca_insert_pt
325 // Remove the cycle between fcx and bcx, so memory can be freed
326 self.entry_bcx.set(None);
329 pub fn get_llreturn(&self) -> BasicBlockRef {
330 if self.llreturn.get().is_none() {
332 self.llreturn.set(Some(unsafe {
333 "return".with_c_str(|buf| {
334 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx, self.llfn, buf)
339 self.llreturn.get().unwrap()
342 pub fn new_block(&'a self,
345 opt_node_id: Option<ast::NodeId>)
348 let llbb = name.with_c_str(|buf| {
349 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx,
353 Block::new(llbb, is_lpad, opt_node_id, self)
357 pub fn new_id_block(&'a self,
359 node_id: ast::NodeId)
361 self.new_block(false, name, Some(node_id))
364 pub fn new_temp_block(&'a self,
367 self.new_block(false, name, None)
370 pub fn join_blocks(&'a self,
372 in_cxs: &[&'a Block<'a>])
374 let out = self.new_id_block("join", id);
375 let mut reachable = false;
376 for bcx in in_cxs.iter() {
377 if !bcx.unreachable.get() {
378 build::Br(*bcx, out.llbb);
383 build::Unreachable(out);
389 // Heap selectors. Indicate which heap something should go on.
394 heap_exchange_closure
397 // Basic block context. We create a block context for each basic block
398 // (single-entry, single-exit sequence of instructions) we generate from Rust
399 // code. Each basic block we generate is attached to a function, typically
400 // with many basic blocks per function. All the basic blocks attached to a
401 // function are organized as a directed graph.
402 pub struct Block<'a> {
403 // The BasicBlockRef returned from a call to
404 // llvm::LLVMAppendBasicBlock(llfn, name), which adds a basic
405 // block to the function pointed to by llfn. We insert
406 // instructions into that block by way of this block context.
407 // The block pointing to this one in the function's digraph.
409 terminated: Cell<bool>,
410 unreachable: Cell<bool>,
412 // Is this block part of a landing pad?
415 // AST node-id associated with this block, if any. Used for
416 // debugging purposes only.
417 opt_node_id: Option<ast::NodeId>,
419 // The function context for the function to which this block is
421 fcx: &'a FunctionContext<'a>,
428 opt_node_id: Option<ast::NodeId>,
429 fcx: &'a FunctionContext<'a>)
431 fcx.block_arena.alloc(Block {
433 terminated: Cell::new(false),
434 unreachable: Cell::new(false),
436 opt_node_id: opt_node_id,
441 pub fn ccx(&self) -> &'a CrateContext { self.fcx.ccx }
442 pub fn tcx(&self) -> &'a ty::ctxt {
445 pub fn sess(&self) -> &'a Session { self.fcx.ccx.sess() }
447 pub fn ident(&self, ident: Ident) -> ~str {
448 token::get_ident(ident).get().to_str()
451 pub fn node_id_to_str(&self, id: ast::NodeId) -> ~str {
452 self.tcx().map.node_to_str(id)
455 pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
459 pub fn expr_is_lval(&self, e: &ast::Expr) -> bool {
460 ty::expr_is_lval(self.tcx(), self.ccx().maps.method_map, e)
463 pub fn expr_kind(&self, e: &ast::Expr) -> ty::ExprKind {
464 ty::expr_kind(self.tcx(), self.ccx().maps.method_map, e)
467 pub fn def(&self, nid: ast::NodeId) -> ast::Def {
468 match self.tcx().def_map.borrow().find(&nid) {
471 self.tcx().sess.bug(format!(
472 "no def associated with node id {:?}", nid));
477 pub fn val_to_str(&self, val: ValueRef) -> ~str {
478 self.ccx().tn.val_to_str(val)
481 pub fn llty_str(&self, ty: Type) -> ~str {
482 self.ccx().tn.type_to_str(ty)
485 pub fn ty_to_str(&self, t: ty::t) -> ~str {
489 pub fn to_str(&self) -> ~str {
490 let blk: *Block = self;
491 format!("[block {}]", blk)
495 pub struct Result<'a> {
500 pub fn rslt<'a>(bcx: &'a Block<'a>, val: ValueRef) -> Result<'a> {
507 impl<'a> Result<'a> {
508 pub fn unpack(&self, bcx: &mut &'a Block<'a>) -> ValueRef {
514 pub fn val_ty(v: ValueRef) -> Type {
516 Type::from_ref(llvm::LLVMTypeOf(v))
520 // LLVM constant constructors.
521 pub fn C_null(t: Type) -> ValueRef {
523 llvm::LLVMConstNull(t.to_ref())
527 pub fn C_undef(t: Type) -> ValueRef {
529 llvm::LLVMGetUndef(t.to_ref())
533 pub fn C_integral(t: Type, u: u64, sign_extend: bool) -> ValueRef {
535 llvm::LLVMConstInt(t.to_ref(), u, sign_extend as Bool)
539 pub fn C_floating(s: &str, t: Type) -> ValueRef {
541 s.with_c_str(|buf| llvm::LLVMConstRealOfString(t.to_ref(), buf))
545 pub fn C_nil(ccx: &CrateContext) -> ValueRef {
546 C_struct(ccx, [], false)
549 pub fn C_bool(ccx: &CrateContext, val: bool) -> ValueRef {
550 C_integral(Type::bool(ccx), val as u64, false)
553 pub fn C_i1(ccx: &CrateContext, val: bool) -> ValueRef {
554 C_integral(Type::i1(ccx), val as u64, false)
557 pub fn C_i32(ccx: &CrateContext, i: i32) -> ValueRef {
558 C_integral(Type::i32(ccx), i as u64, true)
561 pub fn C_i64(ccx: &CrateContext, i: i64) -> ValueRef {
562 C_integral(Type::i64(ccx), i as u64, true)
565 pub fn C_u64(ccx: &CrateContext, i: u64) -> ValueRef {
566 C_integral(Type::i64(ccx), i, false)
569 pub fn C_int(ccx: &CrateContext, i: int) -> ValueRef {
570 C_integral(ccx.int_type, i as u64, true)
573 pub fn C_uint(ccx: &CrateContext, i: uint) -> ValueRef {
574 C_integral(ccx.int_type, i as u64, false)
577 pub fn C_u8(ccx: &CrateContext, i: uint) -> ValueRef {
578 C_integral(Type::i8(ccx), i as u64, false)
582 // This is a 'c-like' raw string, which differs from
583 // our boxed-and-length-annotated strings.
584 pub fn C_cstr(cx: &CrateContext, s: InternedString) -> ValueRef {
586 match cx.const_cstr_cache.borrow().find(&s) {
587 Some(&llval) => return llval,
591 let sc = llvm::LLVMConstStringInContext(cx.llcx,
592 s.get().as_ptr() as *c_char,
593 s.get().len() as c_uint,
596 let gsym = token::gensym("str");
597 let g = format!("str{}", gsym).with_c_str(|buf| {
598 llvm::LLVMAddGlobal(cx.llmod, val_ty(sc).to_ref(), buf)
600 llvm::LLVMSetInitializer(g, sc);
601 llvm::LLVMSetGlobalConstant(g, True);
602 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
604 cx.const_cstr_cache.borrow_mut().insert(s, g);
609 // NB: Do not use `do_spill_noroot` to make this into a constant string, or
610 // you will be kicked off fast isel. See issue #4352 for an example of this.
611 pub fn C_str_slice(cx: &CrateContext, s: InternedString) -> ValueRef {
613 let len = s.get().len();
614 let cs = llvm::LLVMConstPointerCast(C_cstr(cx, s), Type::i8p(cx).to_ref());
615 C_struct(cx, [cs, C_uint(cx, len)], false)
619 pub fn C_binary_slice(cx: &CrateContext, data: &[u8]) -> ValueRef {
621 let len = data.len();
622 let lldata = C_bytes(cx, data);
624 let gsym = token::gensym("binary");
625 let g = format!("binary{}", gsym).with_c_str(|buf| {
626 llvm::LLVMAddGlobal(cx.llmod, val_ty(lldata).to_ref(), buf)
628 llvm::LLVMSetInitializer(g, lldata);
629 llvm::LLVMSetGlobalConstant(g, True);
630 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
632 let cs = llvm::LLVMConstPointerCast(g, Type::i8p(cx).to_ref());
633 C_struct(cx, [cs, C_uint(cx, len)], false)
637 pub fn C_struct(ccx: &CrateContext, elts: &[ValueRef], packed: bool) -> ValueRef {
639 llvm::LLVMConstStructInContext(ccx.llcx,
640 elts.as_ptr(), elts.len() as c_uint,
645 pub fn C_named_struct(t: Type, elts: &[ValueRef]) -> ValueRef {
647 llvm::LLVMConstNamedStruct(t.to_ref(), elts.as_ptr(), elts.len() as c_uint)
651 pub fn C_array(ty: Type, elts: &[ValueRef]) -> ValueRef {
653 return llvm::LLVMConstArray(ty.to_ref(), elts.as_ptr(), elts.len() as c_uint);
657 pub fn C_bytes(ccx: &CrateContext, bytes: &[u8]) -> ValueRef {
659 let ptr = bytes.as_ptr() as *c_char;
660 return llvm::LLVMConstStringInContext(ccx.llcx, ptr, bytes.len() as c_uint, True);
664 pub fn get_param(fndecl: ValueRef, param: uint) -> ValueRef {
666 llvm::LLVMGetParam(fndecl, param as c_uint)
670 pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
673 let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
675 debug!("const_get_elt(v={}, us={:?}, r={})",
676 cx.tn.val_to_str(v), us, cx.tn.val_to_str(r));
682 pub fn is_const(v: ValueRef) -> bool {
684 llvm::LLVMIsConstant(v) == True
688 pub fn const_to_int(v: ValueRef) -> c_longlong {
690 llvm::LLVMConstIntGetSExtValue(v)
694 pub fn const_to_uint(v: ValueRef) -> c_ulonglong {
696 llvm::LLVMConstIntGetZExtValue(v)
700 pub fn is_undef(val: ValueRef) -> bool {
702 llvm::LLVMIsUndef(val) != False
706 pub fn is_null(val: ValueRef) -> bool {
708 llvm::LLVMIsNull(val) != False
712 // Used to identify cached monomorphized functions and vtables
713 #[deriving(Eq, TotalEq, Hash)]
714 pub enum mono_param_id {
715 mono_precise(ty::t, Option<@Vec<mono_id> >),
717 mono_repr(uint /* size */,
723 #[deriving(Eq, TotalEq, Hash)]
724 pub enum MonoDataClass {
725 MonoBits, // Anything not treated differently from arbitrary integer data
726 MonoNonNull, // Non-null pointers (used for optional-pointer optimization)
727 // FIXME(#3547)---scalars and floats are
728 // treated differently in most ABIs. But we
729 // should be doing something more detailed
734 pub fn mono_data_classify(t: ty::t) -> MonoDataClass {
735 match ty::get(t).sty {
736 ty::ty_float(_) => MonoFloat,
737 ty::ty_rptr(..) | ty::ty_uniq(..) | ty::ty_box(..) |
738 ty::ty_str(ty::vstore_uniq) | ty::ty_vec(_, ty::vstore_uniq) |
739 ty::ty_bare_fn(..) => MonoNonNull,
740 // Is that everything? Would closures or slices qualify?
745 #[deriving(Eq, TotalEq, Hash)]
746 pub struct mono_id_ {
748 params: Vec<mono_param_id> }
750 pub type mono_id = @mono_id_;
752 pub fn umax(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
753 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
754 return build::Select(cx, cond, b, a);
757 pub fn umin(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
758 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
759 return build::Select(cx, cond, a, b);
762 pub fn align_to(cx: &Block, off: ValueRef, align: ValueRef) -> ValueRef {
763 let mask = build::Sub(cx, align, C_int(cx.ccx(), 1));
764 let bumped = build::Add(cx, off, mask);
765 return build::And(cx, bumped, build::Not(cx, mask));
768 pub fn monomorphize_type(bcx: &Block, t: ty::t) -> ty::t {
769 match bcx.fcx.param_substs {
771 ty::subst_tps(bcx.tcx(), substs.tys.as_slice(), substs.self_ty, t)
774 assert!(!ty::type_has_params(t));
775 assert!(!ty::type_has_self(t));
781 pub fn node_id_type(bcx: &Block, id: ast::NodeId) -> ty::t {
783 let t = ty::node_id_to_type(tcx, id);
784 monomorphize_type(bcx, t)
787 pub fn expr_ty(bcx: &Block, ex: &ast::Expr) -> ty::t {
788 node_id_type(bcx, ex.id)
791 pub fn expr_ty_adjusted(bcx: &Block, ex: &ast::Expr) -> ty::t {
793 let t = ty::expr_ty_adjusted(tcx, ex, &*bcx.ccx().maps.method_map.borrow());
794 monomorphize_type(bcx, t)
797 // Key used to lookup values supplied for type parameters in an expr.
799 pub enum ExprOrMethodCall {
800 // Type parameters for a path like `None::<int>`
803 // Type parameters for a method call like `a.foo::<int>()`
804 MethodCall(typeck::MethodCall)
807 pub fn node_id_type_params(bcx: &Block, node: ExprOrMethodCall) -> Vec<ty::t> {
809 let params = match node {
810 ExprId(id) => ty::node_id_to_type_params(tcx, id),
811 MethodCall(method_call) => {
812 bcx.ccx().maps.method_map.borrow().get(&method_call).substs.tps.clone()
816 if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
818 format!("type parameters for node {:?} include inference types: {}",
819 node, params.map(|t| bcx.ty_to_str(*t)).connect(",")));
822 match bcx.fcx.param_substs {
824 params.iter().map(|t| {
825 ty::subst_tps(tcx, substs.tys.as_slice(), substs.self_ty, *t)
832 pub fn node_vtables(bcx: &Block, id: typeck::MethodCall)
833 -> Option<typeck::vtable_res> {
834 let vtable_map = bcx.ccx().maps.vtable_map.borrow();
835 let raw_vtables = vtable_map.find(&id);
836 raw_vtables.map(|vts| resolve_vtables_in_fn_ctxt(bcx.fcx, *vts))
839 // Apply the typaram substitutions in the FunctionContext to some
840 // vtables. This should eliminate any vtable_params.
841 pub fn resolve_vtables_in_fn_ctxt(fcx: &FunctionContext, vts: typeck::vtable_res)
842 -> typeck::vtable_res {
843 resolve_vtables_under_param_substs(fcx.ccx.tcx(),
848 pub fn resolve_vtables_under_param_substs(tcx: &ty::ctxt,
849 param_substs: Option<@param_substs>,
850 vts: typeck::vtable_res)
851 -> typeck::vtable_res {
853 resolve_param_vtables_under_param_substs(tcx,
859 pub fn resolve_param_vtables_under_param_substs(
861 param_substs: Option<@param_substs>,
862 ds: typeck::vtable_param_res)
863 -> typeck::vtable_param_res {
865 |d| resolve_vtable_under_param_substs(tcx,
873 pub fn resolve_vtable_under_param_substs(tcx: &ty::ctxt,
874 param_substs: Option<@param_substs>,
875 vt: &typeck::vtable_origin)
876 -> typeck::vtable_origin {
878 typeck::vtable_static(trait_id, ref tys, sub) => {
879 let tys = match param_substs {
883 substs.tys.as_slice(),
888 _ => Vec::from_slice(tys.as_slice())
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.get(n_bound).clone()
928 pub fn dummy_substs(tps: Vec<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().codemap().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(bcx.ccx()));
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(bcx.ccx(), 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); }