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;
29 use util::ppaux::Repr;
30 use util::nodemap::NodeMap;
32 use arena::TypedArena;
33 use collections::HashMap;
34 use std::c_str::ToCStr;
35 use std::cell::{Cell, RefCell};
36 use std::libc::{c_uint, c_longlong, c_ulonglong, c_char};
37 use syntax::ast::Ident;
39 use syntax::ast_map::{PathElem, PathName};
40 use syntax::codemap::Span;
41 use syntax::parse::token::InternedString;
42 use syntax::parse::token;
44 pub use middle::trans::context::CrateContext;
46 fn type_is_newtype_immediate(ccx: &CrateContext, ty: ty::t) -> bool {
47 match ty::get(ty).sty {
48 ty::ty_struct(def_id, ref substs) => {
49 let fields = ty::struct_fields(ccx.tcx(), def_id, substs);
51 fields.get(0).ident.name ==
52 token::special_idents::unnamed_field.name &&
53 type_is_immediate(ccx, fields.get(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 /// Generates a unique symbol based off the name given. This is used to create
104 /// unique symbols for things like closures.
105 pub fn gensym_name(name: &str) -> PathElem {
106 let num = token::gensym(name);
107 // use one colon which will get translated to a period by the mangler, and
108 // we're guaranteed that `num` is globally unique for this crate.
109 PathName(token::gensym(format!("{}:{}", name, num)))
112 pub struct tydesc_info {
114 pub tydesc: ValueRef,
118 pub visit_glue: Cell<Option<ValueRef>>,
122 * A note on nomenclature of linking: "extern", "foreign", and "upcall".
124 * An "extern" is an LLVM symbol we wind up emitting an undefined external
125 * reference to. This means "we don't have the thing in this compilation unit,
126 * please make sure you link it in at runtime". This could be a reference to
127 * C code found in a C library, or rust code found in a rust crate.
129 * Most "externs" are implicitly declared (automatically) as a result of a
130 * user declaring an extern _module_ dependency; this causes the rust driver
131 * to locate an extern crate, scan its compilation metadata, and emit extern
132 * declarations for any symbols used by the declaring crate.
134 * A "foreign" is an extern that references C (or other non-rust ABI) code.
135 * There is no metadata to scan for extern references so in these cases either
136 * a header-digester like bindgen, or manual function prototypes, have to
137 * serve as declarators. So these are usually given explicitly as prototype
138 * declarations, in rust code, with ABI attributes on them noting which ABI to
141 * An "upcall" is a foreign call generated by the compiler (not corresponding
142 * to any user-written call in the code) into the runtime library, to perform
143 * some helper task such as bringing a task to life, allocating memory, etc.
147 pub struct NodeInfo {
152 pub fn expr_info(expr: &ast::Expr) -> NodeInfo {
153 NodeInfo { id: expr.id, span: expr.span }
157 pub n_static_tydescs: Cell<uint>,
158 pub n_glues_created: Cell<uint>,
159 pub n_null_glues: Cell<uint>,
160 pub n_real_glues: Cell<uint>,
161 pub n_fns: Cell<uint>,
162 pub n_monos: Cell<uint>,
163 pub n_inlines: Cell<uint>,
164 pub n_closures: Cell<uint>,
165 pub n_llvm_insns: Cell<uint>,
166 pub llvm_insns: RefCell<HashMap<~str, uint>>,
167 // (ident, time-in-ms, llvm-instructions)
168 pub fn_stats: RefCell<Vec<(~str, uint, uint)> >,
171 pub struct BuilderRef_res {
175 impl Drop for BuilderRef_res {
178 llvm::LLVMDisposeBuilder(self.b);
183 pub fn BuilderRef_res(b: BuilderRef) -> BuilderRef_res {
189 pub type ExternMap = HashMap<~str, ValueRef>;
191 // Here `self_ty` is the real type of the self parameter to this method. It
192 // will only be set in the case of default methods.
193 pub struct param_substs {
194 pub tys: Vec<ty::t> ,
195 pub self_ty: Option<ty::t>,
196 pub vtables: Option<typeck::vtable_res>,
197 pub self_vtables: Option<typeck::vtable_param_res>
201 pub fn validate(&self) {
202 for t in self.tys.iter() { assert!(!ty::type_needs_infer(*t)); }
203 for t in self.self_ty.iter() { assert!(!ty::type_needs_infer(*t)); }
207 fn param_substs_to_str(this: ¶m_substs, tcx: &ty::ctxt) -> ~str {
208 format!("param_substs \\{tys:{}, vtables:{}\\}",
210 this.vtables.repr(tcx))
213 impl Repr for param_substs {
214 fn repr(&self, tcx: &ty::ctxt) -> ~str {
215 param_substs_to_str(self, tcx)
219 // work around bizarre resolve errors
220 pub type RvalueDatum = datum::Datum<datum::Rvalue>;
221 pub type LvalueDatum = datum::Datum<datum::Lvalue>;
223 // Function context. Every LLVM function we create will have one of
225 pub struct FunctionContext<'a> {
226 // The ValueRef returned from a call to llvm::LLVMAddFunction; the
227 // address of the first instruction in the sequence of
228 // instructions for this function that will go in the .text
229 // section of the executable we're generating.
232 // The environment argument in a closure.
233 pub llenv: Option<ValueRef>,
235 // The place to store the return value. If the return type is immediate,
236 // this is an alloca in the function. Otherwise, it's the hidden first
237 // parameter to the function. After function construction, this should
239 pub llretptr: Cell<Option<ValueRef>>,
241 pub entry_bcx: RefCell<Option<&'a Block<'a>>>,
243 // These pub elements: "hoisted basic blocks" containing
244 // administrative activities that have to happen in only one place in
245 // the function, due to LLVM's quirks.
246 // A marker for the place where we want to insert the function's static
247 // allocas, so that LLVM will coalesce them into a single alloca call.
248 pub alloca_insert_pt: Cell<Option<ValueRef>>,
249 pub llreturn: Cell<Option<BasicBlockRef>>,
251 // The a value alloca'd for calls to upcalls.rust_personality. Used when
252 // outputting the resume instruction.
253 pub personality: Cell<Option<ValueRef>>,
255 // True if the caller expects this fn to use the out pointer to
256 // return. Either way, your code should write into llretptr, but if
257 // this value is false, llretptr will be a local alloca.
258 pub caller_expects_out_pointer: bool,
260 // Maps arguments to allocas created for them in llallocas.
261 pub llargs: RefCell<NodeMap<LvalueDatum>>,
263 // Maps the def_ids for local variables to the allocas created for
264 // them in llallocas.
265 pub lllocals: RefCell<NodeMap<LvalueDatum>>,
267 // Same as above, but for closure upvars
268 pub llupvars: RefCell<NodeMap<ValueRef>>,
270 // The NodeId of the function, or -1 if it doesn't correspond to
271 // a user-defined function.
274 // If this function is being monomorphized, this contains the type
275 // substitutions used.
276 pub param_substs: Option<@param_substs>,
278 // The source span and nesting context where this function comes from, for
279 // error reporting and symbol generation.
280 pub span: Option<Span>,
282 // The arena that blocks are allocated from.
283 pub block_arena: &'a TypedArena<Block<'a>>,
285 // This function's enclosing crate context.
286 pub ccx: &'a CrateContext,
288 // Used and maintained by the debuginfo module.
289 pub debug_context: debuginfo::FunctionDebugContext,
292 pub scopes: RefCell<Vec<cleanup::CleanupScope<'a>> >,
295 impl<'a> FunctionContext<'a> {
296 pub fn arg_pos(&self, arg: uint) -> uint {
297 let arg = self.env_arg_pos() + arg;
298 if self.llenv.is_some() {
305 pub fn out_arg_pos(&self) -> uint {
306 assert!(self.caller_expects_out_pointer);
310 pub fn env_arg_pos(&self) -> uint {
311 if self.caller_expects_out_pointer {
318 pub fn cleanup(&self) {
320 llvm::LLVMInstructionEraseFromParent(self.alloca_insert_pt
324 // Remove the cycle between fcx and bcx, so memory can be freed
325 self.entry_bcx.set(None);
328 pub fn get_llreturn(&self) -> BasicBlockRef {
329 if self.llreturn.get().is_none() {
331 self.llreturn.set(Some(unsafe {
332 "return".with_c_str(|buf| {
333 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx, self.llfn, buf)
338 self.llreturn.get().unwrap()
341 pub fn new_block(&'a self,
344 opt_node_id: Option<ast::NodeId>)
347 let llbb = name.with_c_str(|buf| {
348 llvm::LLVMAppendBasicBlockInContext(self.ccx.llcx,
352 Block::new(llbb, is_lpad, opt_node_id, self)
356 pub fn new_id_block(&'a self,
358 node_id: ast::NodeId)
360 self.new_block(false, name, Some(node_id))
363 pub fn new_temp_block(&'a self,
366 self.new_block(false, name, None)
369 pub fn join_blocks(&'a self,
371 in_cxs: &[&'a Block<'a>])
373 let out = self.new_id_block("join", id);
374 let mut reachable = false;
375 for bcx in in_cxs.iter() {
376 if !bcx.unreachable.get() {
377 build::Br(*bcx, out.llbb);
382 build::Unreachable(out);
388 // Heap selectors. Indicate which heap something should go on.
393 heap_exchange_closure
396 // Basic block context. We create a block context for each basic block
397 // (single-entry, single-exit sequence of instructions) we generate from Rust
398 // code. Each basic block we generate is attached to a function, typically
399 // with many basic blocks per function. All the basic blocks attached to a
400 // function are organized as a directed graph.
401 pub struct Block<'a> {
402 // The BasicBlockRef returned from a call to
403 // llvm::LLVMAppendBasicBlock(llfn, name), which adds a basic
404 // block to the function pointed to by llfn. We insert
405 // instructions into that block by way of this block context.
406 // The block pointing to this one in the function's digraph.
407 pub llbb: BasicBlockRef,
408 pub terminated: Cell<bool>,
409 pub unreachable: Cell<bool>,
411 // Is this block part of a landing pad?
414 // AST node-id associated with this block, if any. Used for
415 // debugging purposes only.
416 pub opt_node_id: Option<ast::NodeId>,
418 // The function context for the function to which this block is
420 pub fcx: &'a FunctionContext<'a>,
427 opt_node_id: Option<ast::NodeId>,
428 fcx: &'a FunctionContext<'a>)
430 fcx.block_arena.alloc(Block {
432 terminated: Cell::new(false),
433 unreachable: Cell::new(false),
435 opt_node_id: opt_node_id,
440 pub fn ccx(&self) -> &'a CrateContext { self.fcx.ccx }
441 pub fn tcx(&self) -> &'a ty::ctxt {
444 pub fn sess(&self) -> &'a Session { self.fcx.ccx.sess() }
446 pub fn ident(&self, ident: Ident) -> ~str {
447 token::get_ident(ident).get().to_str()
450 pub fn node_id_to_str(&self, id: ast::NodeId) -> ~str {
451 self.tcx().map.node_to_str(id)
454 pub fn expr_to_str(&self, e: &ast::Expr) -> ~str {
458 pub fn def(&self, nid: ast::NodeId) -> ast::Def {
459 match self.tcx().def_map.borrow().find(&nid) {
462 self.tcx().sess.bug(format!(
463 "no def associated with node id {:?}", nid));
468 pub fn val_to_str(&self, val: ValueRef) -> ~str {
469 self.ccx().tn.val_to_str(val)
472 pub fn llty_str(&self, ty: Type) -> ~str {
473 self.ccx().tn.type_to_str(ty)
476 pub fn ty_to_str(&self, t: ty::t) -> ~str {
480 pub fn to_str(&self) -> ~str {
481 let blk: *Block = self;
482 format!("[block {}]", blk)
486 pub struct Result<'a> {
487 pub bcx: &'a Block<'a>,
491 pub fn rslt<'a>(bcx: &'a Block<'a>, val: ValueRef) -> Result<'a> {
498 pub fn val_ty(v: ValueRef) -> Type {
500 Type::from_ref(llvm::LLVMTypeOf(v))
504 // LLVM constant constructors.
505 pub fn C_null(t: Type) -> ValueRef {
507 llvm::LLVMConstNull(t.to_ref())
511 pub fn C_undef(t: Type) -> ValueRef {
513 llvm::LLVMGetUndef(t.to_ref())
517 pub fn C_integral(t: Type, u: u64, sign_extend: bool) -> ValueRef {
519 llvm::LLVMConstInt(t.to_ref(), u, sign_extend as Bool)
523 pub fn C_floating(s: &str, t: Type) -> ValueRef {
525 s.with_c_str(|buf| llvm::LLVMConstRealOfString(t.to_ref(), buf))
529 pub fn C_nil(ccx: &CrateContext) -> ValueRef {
530 C_struct(ccx, [], false)
533 pub fn C_bool(ccx: &CrateContext, val: bool) -> ValueRef {
534 C_integral(Type::bool(ccx), val as u64, false)
537 pub fn C_i1(ccx: &CrateContext, val: bool) -> ValueRef {
538 C_integral(Type::i1(ccx), val as u64, false)
541 pub fn C_i32(ccx: &CrateContext, i: i32) -> ValueRef {
542 C_integral(Type::i32(ccx), i as u64, true)
545 pub fn C_i64(ccx: &CrateContext, i: i64) -> ValueRef {
546 C_integral(Type::i64(ccx), i as u64, true)
549 pub fn C_u64(ccx: &CrateContext, i: u64) -> ValueRef {
550 C_integral(Type::i64(ccx), i, false)
553 pub fn C_int(ccx: &CrateContext, i: int) -> ValueRef {
554 C_integral(ccx.int_type, i as u64, true)
557 pub fn C_uint(ccx: &CrateContext, i: uint) -> ValueRef {
558 C_integral(ccx.int_type, i as u64, false)
561 pub fn C_u8(ccx: &CrateContext, i: uint) -> ValueRef {
562 C_integral(Type::i8(ccx), i as u64, false)
566 // This is a 'c-like' raw string, which differs from
567 // our boxed-and-length-annotated strings.
568 pub fn C_cstr(cx: &CrateContext, s: InternedString, null_terminated: bool) -> ValueRef {
570 match cx.const_cstr_cache.borrow().find(&s) {
571 Some(&llval) => return llval,
575 let sc = llvm::LLVMConstStringInContext(cx.llcx,
576 s.get().as_ptr() as *c_char,
577 s.get().len() as c_uint,
578 !null_terminated as Bool);
580 let gsym = token::gensym("str");
581 let g = format!("str{}", gsym).with_c_str(|buf| {
582 llvm::LLVMAddGlobal(cx.llmod, val_ty(sc).to_ref(), buf)
584 llvm::LLVMSetInitializer(g, sc);
585 llvm::LLVMSetGlobalConstant(g, True);
586 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
588 cx.const_cstr_cache.borrow_mut().insert(s, g);
593 // NB: Do not use `do_spill_noroot` to make this into a constant string, or
594 // you will be kicked off fast isel. See issue #4352 for an example of this.
595 pub fn C_str_slice(cx: &CrateContext, s: InternedString) -> ValueRef {
597 let len = s.get().len();
598 let cs = llvm::LLVMConstPointerCast(C_cstr(cx, s, false), Type::i8p(cx).to_ref());
599 C_struct(cx, [cs, C_uint(cx, len)], false)
603 pub fn C_binary_slice(cx: &CrateContext, data: &[u8]) -> ValueRef {
605 let len = data.len();
606 let lldata = C_bytes(cx, data);
608 let gsym = token::gensym("binary");
609 let g = format!("binary{}", gsym).with_c_str(|buf| {
610 llvm::LLVMAddGlobal(cx.llmod, val_ty(lldata).to_ref(), buf)
612 llvm::LLVMSetInitializer(g, lldata);
613 llvm::LLVMSetGlobalConstant(g, True);
614 lib::llvm::SetLinkage(g, lib::llvm::InternalLinkage);
616 let cs = llvm::LLVMConstPointerCast(g, Type::i8p(cx).to_ref());
617 C_struct(cx, [cs, C_uint(cx, len)], false)
621 pub fn C_struct(ccx: &CrateContext, elts: &[ValueRef], packed: bool) -> ValueRef {
623 llvm::LLVMConstStructInContext(ccx.llcx,
624 elts.as_ptr(), elts.len() as c_uint,
629 pub fn C_named_struct(t: Type, elts: &[ValueRef]) -> ValueRef {
631 llvm::LLVMConstNamedStruct(t.to_ref(), elts.as_ptr(), elts.len() as c_uint)
635 pub fn C_array(ty: Type, elts: &[ValueRef]) -> ValueRef {
637 return llvm::LLVMConstArray(ty.to_ref(), elts.as_ptr(), elts.len() as c_uint);
641 pub fn C_bytes(ccx: &CrateContext, bytes: &[u8]) -> ValueRef {
643 let ptr = bytes.as_ptr() as *c_char;
644 return llvm::LLVMConstStringInContext(ccx.llcx, ptr, bytes.len() as c_uint, True);
648 pub fn get_param(fndecl: ValueRef, param: uint) -> ValueRef {
650 llvm::LLVMGetParam(fndecl, param as c_uint)
654 pub fn const_get_elt(cx: &CrateContext, v: ValueRef, us: &[c_uint])
657 let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
659 debug!("const_get_elt(v={}, us={:?}, r={})",
660 cx.tn.val_to_str(v), us, cx.tn.val_to_str(r));
666 pub fn is_const(v: ValueRef) -> bool {
668 llvm::LLVMIsConstant(v) == True
672 pub fn const_to_int(v: ValueRef) -> c_longlong {
674 llvm::LLVMConstIntGetSExtValue(v)
678 pub fn const_to_uint(v: ValueRef) -> c_ulonglong {
680 llvm::LLVMConstIntGetZExtValue(v)
684 pub fn is_undef(val: ValueRef) -> bool {
686 llvm::LLVMIsUndef(val) != False
690 pub fn is_null(val: ValueRef) -> bool {
692 llvm::LLVMIsNull(val) != False
696 // Used to identify cached monomorphized functions and vtables
697 #[deriving(Eq, TotalEq, Hash)]
698 pub enum mono_param_id {
699 mono_precise(ty::t, Option<@Vec<mono_id> >),
701 mono_repr(uint /* size */,
707 #[deriving(Eq, TotalEq, Hash)]
708 pub enum MonoDataClass {
709 MonoBits, // Anything not treated differently from arbitrary integer data
710 MonoNonNull, // Non-null pointers (used for optional-pointer optimization)
711 // FIXME(#3547)---scalars and floats are
712 // treated differently in most ABIs. But we
713 // should be doing something more detailed
718 pub fn mono_data_classify(t: ty::t) -> MonoDataClass {
719 match ty::get(t).sty {
720 ty::ty_float(_) => MonoFloat,
721 ty::ty_rptr(..) | ty::ty_uniq(..) | ty::ty_box(..) |
722 ty::ty_str(ty::vstore_uniq) | ty::ty_vec(_, ty::vstore_uniq) |
723 ty::ty_bare_fn(..) => MonoNonNull,
724 // Is that everything? Would closures or slices qualify?
729 #[deriving(Eq, TotalEq, Hash)]
730 pub struct mono_id_ {
732 pub params: Vec<mono_param_id> }
734 pub type mono_id = @mono_id_;
736 pub fn monomorphize_type(bcx: &Block, t: ty::t) -> ty::t {
737 match bcx.fcx.param_substs {
739 ty::subst_tps(bcx.tcx(), substs.tys.as_slice(), substs.self_ty, t)
742 assert!(!ty::type_has_params(t));
743 assert!(!ty::type_has_self(t));
749 pub fn node_id_type(bcx: &Block, id: ast::NodeId) -> ty::t {
751 let t = ty::node_id_to_type(tcx, id);
752 monomorphize_type(bcx, t)
755 pub fn expr_ty(bcx: &Block, ex: &ast::Expr) -> ty::t {
756 node_id_type(bcx, ex.id)
759 pub fn expr_ty_adjusted(bcx: &Block, ex: &ast::Expr) -> ty::t {
761 let t = ty::expr_ty_adjusted(tcx, ex, &*bcx.ccx().maps.method_map.borrow());
762 monomorphize_type(bcx, t)
765 // Key used to lookup values supplied for type parameters in an expr.
767 pub enum ExprOrMethodCall {
768 // Type parameters for a path like `None::<int>`
771 // Type parameters for a method call like `a.foo::<int>()`
772 MethodCall(typeck::MethodCall)
775 pub fn node_id_type_params(bcx: &Block, node: ExprOrMethodCall) -> Vec<ty::t> {
777 let params = match node {
778 ExprId(id) => ty::node_id_to_type_params(tcx, id),
779 MethodCall(method_call) => {
780 bcx.ccx().maps.method_map.borrow().get(&method_call).substs.tps.clone()
784 if !params.iter().all(|t| !ty::type_needs_infer(*t)) {
786 format!("type parameters for node {:?} include inference types: {}",
788 .map(|t| bcx.ty_to_str(*t))
789 .collect::<Vec<~str>>()
793 match bcx.fcx.param_substs {
795 params.iter().map(|t| {
796 ty::subst_tps(tcx, substs.tys.as_slice(), substs.self_ty, *t)
803 pub fn node_vtables(bcx: &Block, id: typeck::MethodCall)
804 -> Option<typeck::vtable_res> {
805 let vtable_map = bcx.ccx().maps.vtable_map.borrow();
806 let raw_vtables = vtable_map.find(&id);
807 raw_vtables.map(|vts| resolve_vtables_in_fn_ctxt(bcx.fcx, *vts))
810 // Apply the typaram substitutions in the FunctionContext to some
811 // vtables. This should eliminate any vtable_params.
812 pub fn resolve_vtables_in_fn_ctxt(fcx: &FunctionContext, vts: typeck::vtable_res)
813 -> typeck::vtable_res {
814 resolve_vtables_under_param_substs(fcx.ccx.tcx(),
819 pub fn resolve_vtables_under_param_substs(tcx: &ty::ctxt,
820 param_substs: Option<@param_substs>,
821 vts: typeck::vtable_res)
822 -> typeck::vtable_res {
824 resolve_param_vtables_under_param_substs(tcx,
830 pub fn resolve_param_vtables_under_param_substs(
832 param_substs: Option<@param_substs>,
833 ds: typeck::vtable_param_res)
834 -> typeck::vtable_param_res {
836 |d| resolve_vtable_under_param_substs(tcx,
844 pub fn resolve_vtable_under_param_substs(tcx: &ty::ctxt,
845 param_substs: Option<@param_substs>,
846 vt: &typeck::vtable_origin)
847 -> typeck::vtable_origin {
849 typeck::vtable_static(trait_id, ref tys, sub) => {
850 let tys = match param_substs {
854 substs.tys.as_slice(),
859 _ => Vec::from_slice(tys.as_slice())
861 typeck::vtable_static(
863 resolve_vtables_under_param_substs(tcx, param_substs, sub))
865 typeck::vtable_param(n_param, n_bound) => {
868 find_vtable(tcx, substs, n_param, n_bound)
871 tcx.sess.bug(format!(
872 "resolve_vtable_under_param_substs: asked to lookup \
873 but no vtables in the fn_ctxt!"))
880 pub fn find_vtable(tcx: &ty::ctxt,
882 n_param: typeck::param_index,
884 -> typeck::vtable_origin {
885 debug!("find_vtable(n_param={:?}, n_bound={}, ps={})",
886 n_param, n_bound, ps.repr(tcx));
888 let param_bounds = match n_param {
889 typeck::param_self => ps.self_vtables.expect("self vtables missing"),
890 typeck::param_numbered(n) => {
891 let tables = ps.vtables
892 .expect("vtables missing where they are needed");
896 param_bounds.get(n_bound).clone()
899 pub fn filename_and_line_num_from_span(bcx: &Block, span: Span)
900 -> (ValueRef, ValueRef) {
901 let loc = bcx.sess().codemap().lookup_char_pos(span.lo);
902 let filename_cstr = C_cstr(bcx.ccx(),
903 token::intern_and_get_ident(loc.file.name), true);
904 let filename = build::PointerCast(bcx, filename_cstr, Type::i8p(bcx.ccx()));
905 let line = C_int(bcx.ccx(), loc.line as int);
909 // Casts a Rust bool value to an i1.
910 pub fn bool_to_i1(bcx: &Block, llval: ValueRef) -> ValueRef {
911 build::ICmp(bcx, lib::llvm::IntNE, llval, C_bool(bcx.ccx(), false))
914 pub fn langcall(bcx: &Block,
919 match bcx.tcx().lang_items.require(li) {
922 let msg = format!("{} {}", msg, s);
924 Some(span) => { bcx.tcx().sess.span_fatal(span, msg); }
925 None => { bcx.tcx().sess.fatal(msg); }