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;
33 use arena::TypedArena;
34 use std::c_str::ToCStr;
35 use std::cell::{Cell, RefCell};
36 use collections::HashMap;
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[0].ident.name == token::special_idents::unnamed_field.name &&
53 type_is_immediate(ccx, fields[0].mt.ty)
59 pub fn type_is_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
60 use middle::trans::machine::llsize_of_alloc;
61 use middle::trans::type_of::sizing_type_of;
63 let simple = ty::type_is_scalar(ty) || ty::type_is_boxed(ty) ||
64 ty::type_is_unique(ty) || ty::type_is_region_ptr(ty) ||
65 type_is_newtype_immediate(ccx, ty) || ty::type_is_bot(ty) ||
66 ty::type_is_simd(tcx, ty);
70 match ty::get(ty).sty {
72 ty::ty_struct(..) | ty::ty_enum(..) | ty::ty_tup(..) => {
73 let llty = sizing_type_of(ccx, ty);
74 llsize_of_alloc(ccx, llty) <= llsize_of_alloc(ccx, ccx.int_type)
76 _ => type_is_zero_size(ccx, ty)
80 pub fn type_is_zero_size(ccx: &CrateContext, ty: ty::t) -> bool {
82 * Identify types which have size zero at runtime.
85 use middle::trans::machine::llsize_of_alloc;
86 use middle::trans::type_of::sizing_type_of;
87 let llty = sizing_type_of(ccx, ty);
88 llsize_of_alloc(ccx, llty) == 0
91 pub fn return_type_is_void(ccx: &CrateContext, ty: ty::t) -> bool {
93 * Identifies types which we declare to be equivalent to `void`
94 * in C for the purpose of function return types. These are
95 * `()`, bot, and uninhabited enums. Note that all such types
96 * are also zero-size, but not all zero-size types use a `void`
97 * return type (in order to aid with C ABI compatibility).
100 ty::type_is_nil(ty) || ty::type_is_bot(ty) || ty::type_is_empty(ccx.tcx, ty)
103 pub fn gensym_name(name: &str) -> PathElem {
104 PathName(token::gensym(name))
107 pub struct tydesc_info {
113 visit_glue: Cell<Option<ValueRef>>,
117 * A note on nomenclature of linking: "extern", "foreign", and "upcall".
119 * An "extern" is an LLVM symbol we wind up emitting an undefined external
120 * reference to. This means "we don't have the thing in this compilation unit,
121 * please make sure you link it in at runtime". This could be a reference to
122 * C code found in a C library, or rust code found in a rust crate.
124 * Most "externs" are implicitly declared (automatically) as a result of a
125 * user declaring an extern _module_ dependency; this causes the rust driver
126 * to locate an extern crate, scan its compilation metadata, and emit extern
127 * declarations for any symbols used by the declaring crate.
129 * A "foreign" is an extern that references C (or other non-rust ABI) code.
130 * There is no metadata to scan for extern references so in these cases either
131 * a header-digester like bindgen, or manual function prototypes, have to
132 * serve as declarators. So these are usually given explicitly as prototype
133 * declarations, in rust code, with ABI attributes on them noting which ABI to
136 * An "upcall" is a foreign call generated by the compiler (not corresponding
137 * to any user-written call in the code) into the runtime library, to perform
138 * some helper task such as bringing a task to life, allocating memory, etc.
142 pub struct NodeInfo {
147 pub fn expr_info(expr: &ast::Expr) -> NodeInfo {
148 NodeInfo { id: expr.id, span: expr.span }
152 n_static_tydescs: Cell<uint>,
153 n_glues_created: Cell<uint>,
154 n_null_glues: Cell<uint>,
155 n_real_glues: Cell<uint>,
158 n_inlines: Cell<uint>,
159 n_closures: Cell<uint>,
160 n_llvm_insns: Cell<uint>,
161 llvm_insns: RefCell<HashMap<~str, uint>>,
162 // (ident, time-in-ms, llvm-instructions)
163 fn_stats: RefCell<~[(~str, uint, uint)]>,
166 pub struct BuilderRef_res {
170 impl Drop for BuilderRef_res {
173 llvm::LLVMDisposeBuilder(self.B);
178 pub fn BuilderRef_res(B: BuilderRef) -> BuilderRef_res {
184 pub type ExternMap = HashMap<~str, ValueRef>;
186 // Here `self_ty` is the real type of the self parameter to this method. It
187 // will only be set in the case of default methods.
188 pub struct param_substs {
190 self_ty: Option<ty::t>,
191 vtables: Option<typeck::vtable_res>,
192 self_vtables: Option<typeck::vtable_param_res>
196 pub fn validate(&self) {
197 for t in self.tys.iter() { assert!(!ty::type_needs_infer(*t)); }
198 for t in self.self_ty.iter() { assert!(!ty::type_needs_infer(*t)); }
202 fn param_substs_to_str(this: ¶m_substs, tcx: ty::ctxt) -> ~str {
203 format!("param_substs \\{tys:{}, vtables:{}\\}",
205 this.vtables.repr(tcx))
208 impl Repr for param_substs {
209 fn repr(&self, tcx: ty::ctxt) -> ~str {
210 param_substs_to_str(self, tcx)
214 // work around bizarre resolve errors
215 type RvalueDatum = datum::Datum<datum::Rvalue>;
216 type LvalueDatum = datum::Datum<datum::Lvalue>;
218 // Function context. Every LLVM function we create will have one of
220 pub struct FunctionContext<'a> {
221 // The ValueRef returned from a call to llvm::LLVMAddFunction; the
222 // address of the first instruction in the sequence of
223 // instructions for this function that will go in the .text
224 // section of the executable we're generating.
227 // The environment argument in a closure.
228 llenv: Option<ValueRef>,
230 // The place to store the return value. If the return type is immediate,
231 // this is an alloca in the function. Otherwise, it's the hidden first
232 // parameter to the function. After function construction, this should
234 llretptr: Cell<Option<ValueRef>>,
236 entry_bcx: RefCell<Option<&'a Block<'a>>>,
238 // These elements: "hoisted basic blocks" containing
239 // administrative activities that have to happen in only one place in
240 // the function, due to LLVM's quirks.
241 // A marker for the place where we want to insert the function's static
242 // allocas, so that LLVM will coalesce them into a single alloca call.
243 alloca_insert_pt: Cell<Option<ValueRef>>,
244 llreturn: Cell<Option<BasicBlockRef>>,
246 // The a value alloca'd for calls to upcalls.rust_personality. Used when
247 // outputting the resume instruction.
248 personality: Cell<Option<ValueRef>>,
250 // True if the caller expects this fn to use the out pointer to
251 // return. Either way, your code should write into llretptr, but if
252 // this value is false, llretptr will be a local alloca.
253 caller_expects_out_pointer: bool,
255 // Maps arguments to allocas created for them in llallocas.
256 llargs: RefCell<HashMap<ast::NodeId, LvalueDatum>>,
258 // Maps the def_ids for local variables to the allocas created for
259 // them in llallocas.
260 lllocals: RefCell<HashMap<ast::NodeId, LvalueDatum>>,
262 // Same as above, but for closure upvars
263 llupvars: RefCell<HashMap<ast::NodeId, ValueRef>>,
265 // The NodeId of the function, or -1 if it doesn't correspond to
266 // a user-defined function.
269 // If this function is being monomorphized, this contains the type
270 // substitutions used.
271 param_substs: Option<@param_substs>,
273 // The source span and nesting context where this function comes from, for
274 // error reporting and symbol generation.
277 // The arena that blocks are allocated from.
278 block_arena: &'a TypedArena<Block<'a>>,
280 // This function's enclosing crate context.
283 // Used and maintained by the debuginfo module.
284 debug_context: debuginfo::FunctionDebugContext,
287 scopes: RefCell<~[cleanup::CleanupScope<'a>]>,
290 impl<'a> FunctionContext<'a> {
291 pub fn arg_pos(&self, arg: uint) -> uint {
292 let arg = self.env_arg_pos() + arg;
293 if self.llenv.is_some() {
300 pub fn out_arg_pos(&self) -> uint {
301 assert!(self.caller_expects_out_pointer);
305 pub fn env_arg_pos(&self) -> uint {
306 if self.caller_expects_out_pointer {
313 pub fn cleanup(&self) {
315 llvm::LLVMInstructionEraseFromParent(self.alloca_insert_pt
319 // Remove the cycle between fcx and bcx, so memory can be freed
320 self.entry_bcx.set(None);
323 pub fn get_llreturn(&self) -> BasicBlockRef {
324 if self.llreturn.get().is_none() {
325 self.llreturn.set(Some(base::mk_return_basic_block(self.llfn)));
328 self.llreturn.get().unwrap()
331 pub fn new_block(&'a self,
334 opt_node_id: Option<ast::NodeId>)
337 let llbb = name.with_c_str(|buf| {
338 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx,
342 Block::new(llbb, is_lpad, opt_node_id, self)
346 pub fn new_id_block(&'a self,
348 node_id: ast::NodeId)
350 self.new_block(false, name, Some(node_id))
353 pub fn new_temp_block(&'a self,
356 self.new_block(false, name, None)
359 pub fn join_blocks(&'a self,
361 in_cxs: &[&'a Block<'a>])
363 let out = self.new_id_block("join", id);
364 let mut reachable = false;
365 for bcx in in_cxs.iter() {
366 if !bcx.unreachable.get() {
367 build::Br(*bcx, out.llbb);
372 build::Unreachable(out);
378 pub fn warn_not_to_commit(ccx: &mut CrateContext, msg: &str) {
379 if !ccx.do_not_commit_warning_issued.get() {
380 ccx.do_not_commit_warning_issued.set(true);
381 ccx.sess.warn(msg.to_str() + " -- do not commit like this!");
385 // Heap selectors. Indicate which heap something should go on.
390 heap_exchange_closure
393 // Basic block context. We create a block context for each basic block
394 // (single-entry, single-exit sequence of instructions) we generate from Rust
395 // code. Each basic block we generate is attached to a function, typically
396 // with many basic blocks per function. All the basic blocks attached to a
397 // function are organized as a directed graph.
398 pub struct Block<'a> {
399 // The BasicBlockRef returned from a call to
400 // llvm::LLVMAppendBasicBlock(llfn, name), which adds a basic
401 // block to the function pointed to by llfn. We insert
402 // instructions into that block by way of this block context.
403 // The block pointing to this one in the function's digraph.
405 terminated: Cell<bool>,
406 unreachable: Cell<bool>,
408 // Is this block part of a landing pad?
411 // AST node-id associated with this block, if any. Used for
412 // debugging purposes only.
413 opt_node_id: Option<ast::NodeId>,
415 // The function context for the function to which this block is
417 fcx: &'a FunctionContext<'a>,
424 opt_node_id: Option<ast::NodeId>,
425 fcx: &'a FunctionContext<'a>)
427 fcx.block_arena.alloc(Block {
429 terminated: Cell::new(false),
430 unreachable: Cell::new(false),
432 opt_node_id: opt_node_id,
437 pub fn ccx(&self) -> @CrateContext { self.fcx.ccx }
438 pub fn tcx(&self) -> ty::ctxt {
441 pub fn sess(&self) -> Session { self.fcx.ccx.sess }
443 pub fn ident(&self, ident: Ident) -> ~str {
444 token::get_ident(ident).get().to_str()
447 pub fn node_id_to_str(&self, id: ast::NodeId) -> ~str {
448 self.tcx().map.node_to_str(id)
451 pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
455 pub fn expr_is_lval(&self, e: &ast::Expr) -> bool {
456 ty::expr_is_lval(self.tcx(), self.ccx().maps.method_map, e)
459 pub fn expr_kind(&self, e: &ast::Expr) -> ty::ExprKind {
460 ty::expr_kind(self.tcx(), self.ccx().maps.method_map, e)
463 pub fn def(&self, nid: ast::NodeId) -> ast::Def {
464 let def_map = self.tcx().def_map.borrow();
465 match def_map.get().find(&nid) {
468 self.tcx().sess.bug(format!(
469 "no def associated with node id {:?}", nid));
474 pub fn val_to_str(&self, val: ValueRef) -> ~str {
475 self.ccx().tn.val_to_str(val)
478 pub fn llty_str(&self, ty: Type) -> ~str {
479 self.ccx().tn.type_to_str(ty)
482 pub fn ty_to_str(&self, t: ty::t) -> ~str {
486 pub fn to_str(&self) -> ~str {
487 let blk: *Block = self;
488 format!("[block {}]", blk)
492 pub struct Result<'a> {
497 pub fn rslt<'a>(bcx: &'a Block<'a>, val: ValueRef) -> Result<'a> {
504 impl<'a> Result<'a> {
505 pub fn unpack(&self, bcx: &mut &'a Block<'a>) -> ValueRef {
511 pub fn val_ty(v: ValueRef) -> Type {
513 Type::from_ref(llvm::LLVMTypeOf(v))
517 // LLVM constant constructors.
518 pub fn C_null(t: Type) -> ValueRef {
520 llvm::LLVMConstNull(t.to_ref())
524 pub fn C_undef(t: Type) -> ValueRef {
526 llvm::LLVMGetUndef(t.to_ref())
530 pub fn C_integral(t: Type, u: u64, sign_extend: bool) -> ValueRef {
532 llvm::LLVMConstInt(t.to_ref(), u, sign_extend as Bool)
536 pub fn C_floating(s: &str, t: Type) -> ValueRef {
538 s.with_c_str(|buf| llvm::LLVMConstRealOfString(t.to_ref(), buf))
542 pub fn C_nil() -> ValueRef {
546 pub fn C_bool(val: bool) -> ValueRef {
547 C_integral(Type::bool(), val as u64, false)
550 pub fn C_i1(val: bool) -> ValueRef {
551 C_integral(Type::i1(), val as u64, false)
554 pub fn C_i32(i: i32) -> ValueRef {
555 return C_integral(Type::i32(), i as u64, true);
558 pub fn C_i64(i: i64) -> ValueRef {
559 return C_integral(Type::i64(), i as u64, true);
562 pub fn C_u64(i: u64) -> ValueRef {
563 return C_integral(Type::i64(), i, false);
566 pub fn C_int(cx: &CrateContext, i: int) -> ValueRef {
567 return C_integral(cx.int_type, i as u64, true);
570 pub fn C_uint(cx: &CrateContext, i: uint) -> ValueRef {
571 return C_integral(cx.int_type, i as u64, false);
574 pub fn C_u8(i: uint) -> ValueRef {
575 return C_integral(Type::i8(), i as u64, false);
579 // This is a 'c-like' raw string, which differs from
580 // our boxed-and-length-annotated strings.
581 pub fn C_cstr(cx: &CrateContext, s: InternedString) -> ValueRef {
584 let const_cstr_cache = cx.const_cstr_cache.borrow();
585 match const_cstr_cache.get().find(&s) {
586 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 let mut const_cstr_cache = cx.const_cstr_cache.borrow_mut();
605 const_cstr_cache.get().insert(s, g);
610 // NB: Do not use `do_spill_noroot` to make this into a constant string, or
611 // you will be kicked off fast isel. See issue #4352 for an example of this.
612 pub fn C_str_slice(cx: &CrateContext, s: InternedString) -> ValueRef {
614 let len = s.get().len();
615 let cs = llvm::LLVMConstPointerCast(C_cstr(cx, s), Type::i8p().to_ref());
616 C_struct([cs, C_uint(cx, len)], false)
620 pub fn C_binary_slice(cx: &CrateContext, data: &[u8]) -> ValueRef {
622 let len = data.len();
623 let lldata = C_bytes(data);
625 let gsym = token::gensym("binary");
626 let g = format!("binary{}", gsym).with_c_str(|buf| {
627 llvm::LLVMAddGlobal(cx.llmod, val_ty(lldata).to_ref(), buf)
629 llvm::LLVMSetInitializer(g, lldata);
630 llvm::LLVMSetGlobalConstant(g, True);
631 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
633 let cs = llvm::LLVMConstPointerCast(g, Type::i8p().to_ref());
634 C_struct([cs, C_uint(cx, len)], false)
638 pub fn C_zero_byte_arr(size: uint) -> ValueRef {
641 let mut elts: ~[ValueRef] = ~[];
642 while i < size { elts.push(C_u8(0u)); i += 1u; }
643 return llvm::LLVMConstArray(Type::i8().to_ref(),
644 elts.as_ptr(), elts.len() as c_uint);
648 pub fn C_struct(elts: &[ValueRef], packed: bool) -> ValueRef {
651 llvm::LLVMConstStructInContext(base::task_llcx(),
652 elts.as_ptr(), elts.len() as c_uint,
657 pub fn C_named_struct(T: Type, elts: &[ValueRef]) -> ValueRef {
659 llvm::LLVMConstNamedStruct(T.to_ref(), elts.as_ptr(), elts.len() as c_uint)
663 pub fn C_array(ty: Type, elts: &[ValueRef]) -> ValueRef {
665 return llvm::LLVMConstArray(ty.to_ref(), elts.as_ptr(), elts.len() as c_uint);
669 pub fn C_bytes(bytes: &[u8]) -> ValueRef {
671 let ptr = bytes.as_ptr() as *c_char;
672 return llvm::LLVMConstStringInContext(base::task_llcx(), ptr, bytes.len() as c_uint, True);
676 pub fn get_param(fndecl: ValueRef, param: uint) -> ValueRef {
678 llvm::LLVMGetParam(fndecl, param as c_uint)
682 pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
685 let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
687 debug!("const_get_elt(v={}, us={:?}, r={})",
688 cx.tn.val_to_str(v), us, cx.tn.val_to_str(r));
694 pub fn is_const(v: ValueRef) -> bool {
696 llvm::LLVMIsConstant(v) == True
700 pub fn const_to_int(v: ValueRef) -> c_longlong {
702 llvm::LLVMConstIntGetSExtValue(v)
706 pub fn const_to_uint(v: ValueRef) -> c_ulonglong {
708 llvm::LLVMConstIntGetZExtValue(v)
712 pub fn is_undef(val: ValueRef) -> bool {
714 llvm::LLVMIsUndef(val) != False
718 pub fn is_null(val: ValueRef) -> bool {
720 llvm::LLVMIsNull(val) != False
724 // Used to identify cached monomorphized functions and vtables
725 #[deriving(Eq, Hash)]
726 pub enum mono_param_id {
727 mono_precise(ty::t, Option<@~[mono_id]>),
729 mono_repr(uint /* size */,
735 #[deriving(Eq, Hash)]
736 pub enum MonoDataClass {
737 MonoBits, // Anything not treated differently from arbitrary integer data
738 MonoNonNull, // Non-null pointers (used for optional-pointer optimization)
739 // FIXME(#3547)---scalars and floats are
740 // treated differently in most ABIs. But we
741 // should be doing something more detailed
746 pub fn mono_data_classify(t: ty::t) -> MonoDataClass {
747 match ty::get(t).sty {
748 ty::ty_float(_) => MonoFloat,
749 ty::ty_rptr(..) | ty::ty_uniq(..) | ty::ty_box(..) |
750 ty::ty_str(ty::vstore_uniq) | ty::ty_vec(_, ty::vstore_uniq) |
751 ty::ty_bare_fn(..) => MonoNonNull,
752 // Is that everything? Would closures or slices qualify?
757 #[deriving(Eq, Hash)]
758 pub struct mono_id_ {
760 params: ~[mono_param_id]
763 pub type mono_id = @mono_id_;
765 pub fn umax(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
766 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
767 return build::Select(cx, cond, b, a);
770 pub fn umin(cx: &Block, a: ValueRef, b: ValueRef) -> ValueRef {
771 let cond = build::ICmp(cx, lib::llvm::IntULT, a, b);
772 return build::Select(cx, cond, a, b);
775 pub fn align_to(cx: &Block, off: ValueRef, align: ValueRef) -> ValueRef {
776 let mask = build::Sub(cx, align, C_int(cx.ccx(), 1));
777 let bumped = build::Add(cx, off, mask);
778 return build::And(cx, bumped, build::Not(cx, mask));
781 pub fn monomorphize_type(bcx: &Block, t: ty::t) -> ty::t {
782 match bcx.fcx.param_substs {
784 ty::subst_tps(bcx.tcx(), substs.tys, substs.self_ty, t)
787 assert!(!ty::type_has_params(t));
788 assert!(!ty::type_has_self(t));
794 pub fn node_id_type(bcx: &Block, id: ast::NodeId) -> ty::t {
796 let t = ty::node_id_to_type(tcx, id);
797 monomorphize_type(bcx, t)
800 pub fn expr_ty(bcx: &Block, ex: &ast::Expr) -> ty::t {
801 node_id_type(bcx, ex.id)
804 pub fn expr_ty_adjusted(bcx: &Block, ex: &ast::Expr) -> ty::t {
806 let t = ty::expr_ty_adjusted(tcx, ex);
807 monomorphize_type(bcx, t)
810 pub fn node_id_type_params(bcx: &Block, id: ast::NodeId, is_method: bool) -> ~[ty::t] {
812 let params = if is_method {
813 bcx.ccx().maps.method_map.borrow().get().get(&id).substs.tps.clone()
815 ty::node_id_to_type_params(tcx, id)
818 if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
820 format!("type parameters for node {} include inference types: {}",
821 id, params.map(|t| bcx.ty_to_str(*t)).connect(",")));
824 match bcx.fcx.param_substs {
826 params.iter().map(|t| {
827 ty::subst_tps(tcx, substs.tys, substs.self_ty, *t)
834 pub fn node_vtables(bcx: &Block, id: ast::NodeId)
835 -> Option<typeck::vtable_res> {
836 let vtable_map = bcx.ccx().maps.vtable_map.borrow();
837 let raw_vtables = vtable_map.get().find(&id);
838 raw_vtables.map(|vts| resolve_vtables_in_fn_ctxt(bcx.fcx, *vts))
841 // Apply the typaram substitutions in the FunctionContext to some
842 // vtables. This should eliminate any vtable_params.
843 pub fn resolve_vtables_in_fn_ctxt(fcx: &FunctionContext, vts: typeck::vtable_res)
844 -> typeck::vtable_res {
845 resolve_vtables_under_param_substs(fcx.ccx.tcx,
850 pub fn resolve_vtables_under_param_substs(tcx: ty::ctxt,
851 param_substs: Option<@param_substs>,
852 vts: typeck::vtable_res)
853 -> typeck::vtable_res {
855 resolve_param_vtables_under_param_substs(tcx,
861 pub fn resolve_param_vtables_under_param_substs(
863 param_substs: Option<@param_substs>,
864 ds: typeck::vtable_param_res)
865 -> typeck::vtable_param_res {
867 |d| resolve_vtable_under_param_substs(tcx,
875 pub fn resolve_vtable_under_param_substs(tcx: ty::ctxt,
876 param_substs: Option<@param_substs>,
877 vt: &typeck::vtable_origin)
878 -> typeck::vtable_origin {
880 typeck::vtable_static(trait_id, ref tys, sub) => {
881 let tys = match param_substs {
884 ty::subst_tps(tcx, substs.tys, substs.self_ty, *t)
889 typeck::vtable_static(
891 resolve_vtables_under_param_substs(tcx, param_substs, sub))
893 typeck::vtable_param(n_param, n_bound) => {
896 find_vtable(tcx, substs, n_param, n_bound)
899 tcx.sess.bug(format!(
900 "resolve_vtable_under_param_substs: asked to lookup \
901 but no vtables in the fn_ctxt!"))
908 pub fn find_vtable(tcx: ty::ctxt,
910 n_param: typeck::param_index,
912 -> typeck::vtable_origin {
913 debug!("find_vtable(n_param={:?}, n_bound={}, ps={})",
914 n_param, n_bound, ps.repr(tcx));
916 let param_bounds = match n_param {
917 typeck::param_self => ps.self_vtables.expect("self vtables missing"),
918 typeck::param_numbered(n) => {
919 let tables = ps.vtables
920 .expect("vtables missing where they are needed");
924 param_bounds[n_bound].clone()
927 pub fn dummy_substs(tps: ~[ty::t]) -> ty::substs {
929 regions: ty::ErasedRegions,
935 pub fn filename_and_line_num_from_span(bcx: &Block, span: Span)
936 -> (ValueRef, ValueRef) {
937 let loc = bcx.sess().parse_sess.cm.lookup_char_pos(span.lo);
938 let filename_cstr = C_cstr(bcx.ccx(),
939 token::intern_and_get_ident(loc.file.name));
940 let filename = build::PointerCast(bcx, filename_cstr, Type::i8p());
941 let line = C_int(bcx.ccx(), loc.line as int);
945 // Casts a Rust bool value to an i1.
946 pub fn bool_to_i1(bcx: &Block, llval: ValueRef) -> ValueRef {
947 build::ICmp(bcx, lib::llvm::IntNE, llval, C_bool(false))
950 pub fn langcall(bcx: &Block,
955 match bcx.tcx().lang_items.require(li) {
958 let msg = format!("{} {}", msg, s);
960 Some(span) => { bcx.tcx().sess.span_fatal(span, msg); }
961 None => { bcx.tcx().sess.fatal(msg); }