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use back::abi;
use back::link::*;
use llvm::{ValueRef, True, get_param};
use llvm;
use middle::lang_items::ExchangeFreeFnLangItem;
use middle::subst;
use middle::subst::{Subst, Substs};
use trans::adt;
use trans::base::*;
use trans::build::*;
use trans::callee;
use trans::cleanup;
use trans::cleanup::CleanupMethods;
use trans::common::*;
use trans::datum;
use trans::debuginfo;
use trans::expr;
use trans::machine::*;
use trans::tvec;
use trans::type_::Type;
use trans::type_of::{type_of, sizing_type_of, align_of};
use middle::ty::{mod, Ty};
use util::ppaux::{ty_to_short_str, Repr};
use util::ppaux;
use arena::TypedArena;
use std::c_str::ToCStr;
use libc::c_uint;
use syntax::ast;
use syntax::parse::token;
pub fn trans_exchange_free_dyn<'blk, 'tcx>(cx: Block<'blk, 'tcx>, v: ValueRef,
size: ValueRef, align: ValueRef)
-> Block<'blk, 'tcx> {
let _icx = push_ctxt("trans_exchange_free");
let ccx = cx.ccx();
callee::trans_lang_call(cx,
langcall(cx, None, "", ExchangeFreeFnLangItem),
&[PointerCast(cx, v, Type::i8p(ccx)), size, align],
Some(expr::Ignore)).bcx
}
pub fn trans_exchange_free<'blk, 'tcx>(cx: Block<'blk, 'tcx>, v: ValueRef,
size: u64, align: u32) -> Block<'blk, 'tcx> {
trans_exchange_free_dyn(cx, v, C_uint(cx.ccx(), size),
C_uint(cx.ccx(), align))
}
pub fn trans_exchange_free_ty<'blk, 'tcx>(bcx: Block<'blk, 'tcx>, ptr: ValueRef,
content_ty: Ty<'tcx>) -> Block<'blk, 'tcx> {
assert!(type_is_sized(bcx.ccx().tcx(), content_ty));
let sizing_type = sizing_type_of(bcx.ccx(), content_ty);
let content_size = llsize_of_alloc(bcx.ccx(), sizing_type);
if content_size != 0 {
let content_align = align_of(bcx.ccx(), content_ty);
trans_exchange_free(bcx, ptr, content_size, content_align)
} else {
bcx
}
}
pub fn get_drop_glue_type<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
t: Ty<'tcx>) -> Ty<'tcx> {
let tcx = ccx.tcx();
if !type_is_sized(tcx, t) {
return t
}
if !type_needs_drop(tcx, t) {
return tcx.types.i8;
}
match t.sty {
ty::ty_uniq(typ) if !type_needs_drop(tcx, typ)
&& type_is_sized(tcx, typ) => {
let llty = sizing_type_of(ccx, typ);
if llsize_of_alloc(ccx, llty) == 0 {
tcx.types.i8
} else {
t
}
}
_ => t
}
}
pub fn drop_ty<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
v: ValueRef,
t: Ty<'tcx>,
source_location: Option<NodeInfo>)
-> Block<'blk, 'tcx> {
debug!("drop_ty(t={})", t.repr(bcx.tcx()));
let _icx = push_ctxt("drop_ty");
if type_needs_drop(bcx.tcx(), t) {
let ccx = bcx.ccx();
let glue = get_drop_glue(ccx, t);
let glue_type = get_drop_glue_type(ccx, t);
let ptr = if glue_type != t {
PointerCast(bcx, v, type_of(ccx, glue_type).ptr_to())
} else {
v
};
match source_location {
Some(sl) => debuginfo::set_source_location(bcx.fcx, sl.id, sl.span),
None => debuginfo::clear_source_location(bcx.fcx)
};
Call(bcx, glue, &[ptr], None);
}
bcx
}
pub fn drop_ty_immediate<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
v: ValueRef,
t: Ty<'tcx>,
source_location: Option<NodeInfo>)
-> Block<'blk, 'tcx> {
let _icx = push_ctxt("drop_ty_immediate");
let vp = alloca(bcx, type_of(bcx.ccx(), t), "");
Store(bcx, v, vp);
drop_ty(bcx, vp, t, source_location)
}
pub fn get_drop_glue<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>) -> ValueRef {
debug!("make drop glue for {}", ppaux::ty_to_string(ccx.tcx(), t));
let t = get_drop_glue_type(ccx, t);
debug!("drop glue type {}", ppaux::ty_to_string(ccx.tcx(), t));
match ccx.drop_glues().borrow().get(&t) {
Some(&glue) => return glue,
_ => { }
}
let llty = if type_is_sized(ccx.tcx(), t) {
type_of(ccx, t).ptr_to()
} else {
type_of(ccx, ty::mk_uniq(ccx.tcx(), t)).ptr_to()
};
let llfnty = Type::glue_fn(ccx, llty);
let (glue, new_sym) = match ccx.available_drop_glues().borrow().get(&t) {
Some(old_sym) => {
let glue = decl_cdecl_fn(ccx, old_sym[], llfnty, ty::mk_nil(ccx.tcx()));
(glue, None)
},
None => {
let (sym, glue) = declare_generic_glue(ccx, t, llfnty, "drop");
(glue, Some(sym))
},
};
ccx.drop_glues().borrow_mut().insert(t, glue);
match new_sym {
Some(sym) => {
ccx.available_drop_glues().borrow_mut().insert(t, sym);
make_generic_glue(ccx, t, glue, make_drop_glue, "drop");
},
None => {},
}
glue
}
fn trans_struct_drop_flag<'blk, 'tcx>(mut bcx: Block<'blk, 'tcx>,
t: Ty<'tcx>,
v0: ValueRef,
dtor_did: ast::DefId,
class_did: ast::DefId,
substs: &subst::Substs<'tcx>)
-> Block<'blk, 'tcx> {
let repr = adt::represent_type(bcx.ccx(), t);
let struct_data = if type_is_sized(bcx.tcx(), t) {
v0
} else {
let llval = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
Load(bcx, llval)
};
let drop_flag = unpack_datum!(bcx, adt::trans_drop_flag_ptr(bcx, &*repr, struct_data));
with_cond(bcx, load_ty(bcx, drop_flag.val, bcx.tcx().types.bool), |cx| {
trans_struct_drop(cx, t, v0, dtor_did, class_did, substs)
})
}
fn trans_struct_drop<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
t: Ty<'tcx>,
v0: ValueRef,
dtor_did: ast::DefId,
class_did: ast::DefId,
substs: &subst::Substs<'tcx>)
-> Block<'blk, 'tcx> {
let repr = adt::represent_type(bcx.ccx(), t);
let dtor_addr = get_res_dtor(bcx.ccx(), dtor_did, t,
class_did, substs);
let params = unsafe {
let ty = Type::from_ref(llvm::LLVMTypeOf(dtor_addr));
ty.element_type().func_params()
};
let fty = ty::lookup_item_type(bcx.tcx(), dtor_did).ty.subst(bcx.tcx(), substs);
let self_ty = match fty.sty {
ty::ty_bare_fn(_, ref f) => {
assert!(f.sig.0.inputs.len() == 1);
f.sig.0.inputs[0]
}
_ => bcx.sess().bug(format!("Expected function type, found {}",
bcx.ty_to_string(fty))[])
};
let (struct_data, info) = if type_is_sized(bcx.tcx(), t) {
(v0, None)
} else {
let data = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
let info = GEPi(bcx, v0, &[0, abi::FAT_PTR_EXTRA]);
(Load(bcx, data), Some(Load(bcx, info)))
};
adt::fold_variants(bcx, &*repr, struct_data, |variant_cx, st, value| {
let field_scope = variant_cx.fcx.push_custom_cleanup_scope();
assert_eq!(params.len(), 1);
let self_arg = if type_is_fat_ptr(bcx.tcx(), self_ty) {
let boxed_ty = ty::mk_open(bcx.tcx(), t);
let scratch = datum::rvalue_scratch_datum(bcx, boxed_ty, "__fat_ptr_drop_self");
Store(bcx, value, GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_ADDR]));
Store(bcx,
info.unwrap_or(C_null(Type::i8p(bcx.ccx()))),
GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_EXTRA]));
PointerCast(variant_cx, scratch.val, params[0])
} else {
PointerCast(variant_cx, value, params[0])
};
let args = vec!(self_arg);
for (i, ty) in st.fields.iter().enumerate().rev() {
let llfld_a = adt::struct_field_ptr(variant_cx, &*st, value, i, false);
let val = if type_is_sized(bcx.tcx(), *ty) {
llfld_a
} else {
let boxed_ty = ty::mk_open(bcx.tcx(), *ty);
let scratch = datum::rvalue_scratch_datum(bcx, boxed_ty, "__fat_ptr_drop_field");
Store(bcx, llfld_a, GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_ADDR]));
Store(bcx, info.unwrap(), GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_EXTRA]));
scratch.val
};
variant_cx.fcx.schedule_drop_mem(cleanup::CustomScope(field_scope),
val, *ty);
}
let dtor_ty = ty::mk_ctor_fn(bcx.tcx(),
class_did,
&[get_drop_glue_type(bcx.ccx(), t)],
ty::mk_nil(bcx.tcx()));
let (_, variant_cx) = invoke(variant_cx, dtor_addr, args[], dtor_ty, None);
variant_cx.fcx.pop_and_trans_custom_cleanup_scope(variant_cx, field_scope);
variant_cx
})
}
fn size_and_align_of_dst<'blk, 'tcx>(bcx: Block<'blk, 'tcx>, t: Ty<'tcx>, info: ValueRef)
-> (ValueRef, ValueRef) {
debug!("calculate size of DST: {}; with lost info: {}",
bcx.ty_to_string(t), bcx.val_to_string(info));
if type_is_sized(bcx.tcx(), t) {
let sizing_type = sizing_type_of(bcx.ccx(), t);
let size = C_uint(bcx.ccx(), llsize_of_alloc(bcx.ccx(), sizing_type));
let align = C_uint(bcx.ccx(), align_of(bcx.ccx(), t));
return (size, align);
}
match t.sty {
ty::ty_struct(id, substs) => {
let ccx = bcx.ccx();
assert!(!ty::type_is_simd(bcx.tcx(), t));
let repr = adt::represent_type(ccx, t);
let sizing_type = adt::sizing_type_of(ccx, &*repr, true);
let sized_size = C_uint(ccx, llsize_of_alloc(ccx, sizing_type));
let sized_align = C_uint(ccx, llalign_of_min(ccx, sizing_type));
let fields = ty::struct_fields(bcx.tcx(), id, substs);
let last_field = fields[fields.len()-1];
let field_ty = last_field.mt.ty;
let (unsized_size, unsized_align) = size_and_align_of_dst(bcx, field_ty, info);
let size = Add(bcx, sized_size, unsized_size);
let align = Select(bcx,
ICmp(bcx, llvm::IntULT, sized_align, unsized_align),
sized_align,
unsized_align);
(size, align)
}
ty::ty_trait(..) => {
let info = PointerCast(bcx, info, Type::int(bcx.ccx()).ptr_to());
let size_ptr = GEPi(bcx, info, &[1u]);
let align_ptr = GEPi(bcx, info, &[2u]);
(Load(bcx, size_ptr), Load(bcx, align_ptr))
}
ty::ty_vec(unit_ty, None) => {
let llunit_ty = sizing_type_of(bcx.ccx(), unit_ty);
let unit_size = llsize_of_alloc(bcx.ccx(), llunit_ty);
(Mul(bcx, info, C_uint(bcx.ccx(), unit_size)), C_uint(bcx.ccx(), 8u))
}
_ => bcx.sess().bug(format!("Unexpected unsized type, found {}",
bcx.ty_to_string(t))[])
}
}
fn make_drop_glue<'blk, 'tcx>(bcx: Block<'blk, 'tcx>, v0: ValueRef, t: Ty<'tcx>)
-> Block<'blk, 'tcx> {
let _icx = push_ctxt("make_drop_glue");
match t.sty {
ty::ty_uniq(content_ty) => {
match content_ty.sty {
ty::ty_vec(ty, None) => {
tvec::make_drop_glue_unboxed(bcx, v0, ty, true)
}
ty::ty_str => {
let unit_ty = ty::sequence_element_type(bcx.tcx(), content_ty);
tvec::make_drop_glue_unboxed(bcx, v0, unit_ty, true)
}
ty::ty_trait(..) => {
let lluniquevalue = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
let concrete_ptr = Load(bcx, lluniquevalue);
with_cond(bcx, IsNotNull(bcx, concrete_ptr), |bcx| {
let dtor_ptr = Load(bcx, GEPi(bcx, v0, &[0, abi::FAT_PTR_EXTRA]));
let dtor = Load(bcx, dtor_ptr);
Call(bcx,
dtor,
&[PointerCast(bcx, lluniquevalue, Type::i8p(bcx.ccx()))],
None);
bcx
})
}
ty::ty_struct(..) if !type_is_sized(bcx.tcx(), content_ty) => {
let llval = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
let llbox = Load(bcx, llval);
let not_null = IsNotNull(bcx, llbox);
with_cond(bcx, not_null, |bcx| {
let bcx = drop_ty(bcx, v0, content_ty, None);
let info = GEPi(bcx, v0, &[0, abi::FAT_PTR_EXTRA]);
let info = Load(bcx, info);
let (llsize, llalign) = size_and_align_of_dst(bcx, content_ty, info);
trans_exchange_free_dyn(bcx, llbox, llsize, llalign)
})
}
_ => {
assert!(type_is_sized(bcx.tcx(), content_ty));
let llval = v0;
let llbox = Load(bcx, llval);
let not_null = IsNotNull(bcx, llbox);
with_cond(bcx, not_null, |bcx| {
let bcx = drop_ty(bcx, llbox, content_ty, None);
trans_exchange_free_ty(bcx, llbox, content_ty)
})
}
}
}
ty::ty_struct(did, substs) | ty::ty_enum(did, substs) => {
let tcx = bcx.tcx();
match ty::ty_dtor(tcx, did) {
ty::TraitDtor(dtor, true) => {
if type_is_sized(bcx.tcx(), t) {
trans_struct_drop_flag(bcx, t, v0, dtor, did, substs)
} else {
bcx.sess().warn(format!("Ignoring drop flag in destructor for {}\
because the struct is unsized. See issue\
#16758",
bcx.ty_to_string(t))[]);
trans_struct_drop(bcx, t, v0, dtor, did, substs)
}
}
ty::TraitDtor(dtor, false) => {
trans_struct_drop(bcx, t, v0, dtor, did, substs)
}
ty::NoDtor => {
iter_structural_ty(bcx, v0, t, |bb, vv, tt| drop_ty(bb, vv, tt, None))
}
}
}
ty::ty_unboxed_closure(..) => iter_structural_ty(bcx,
v0,
t,
|bb, vv, tt| drop_ty(bb, vv, tt, None)),
ty::ty_closure(ref f) if f.store == ty::UniqTraitStore => {
let box_cell_v = GEPi(bcx, v0, &[0u, abi::FAT_PTR_EXTRA]);
let env = Load(bcx, box_cell_v);
let env_ptr_ty = Type::at_box(bcx.ccx(), Type::i8(bcx.ccx())).ptr_to();
let env = PointerCast(bcx, env, env_ptr_ty);
with_cond(bcx, IsNotNull(bcx, env), |bcx| {
let dtor_ptr = GEPi(bcx, env, &[0u, abi::BOX_FIELD_DROP_GLUE]);
let dtor = Load(bcx, dtor_ptr);
Call(bcx, dtor, &[PointerCast(bcx, box_cell_v, Type::i8p(bcx.ccx()))], None);
bcx
})
}
ty::ty_trait(..) => {
let lluniquevalue = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
let dtor_ptr = Load(bcx, GEPi(bcx, v0, &[0, abi::FAT_PTR_EXTRA]));
let dtor = Load(bcx, dtor_ptr);
Call(bcx,
dtor,
&[PointerCast(bcx, Load(bcx, lluniquevalue), Type::i8p(bcx.ccx()))],
None);
bcx
}
ty::ty_vec(ty, None) => tvec::make_drop_glue_unboxed(bcx, v0, ty, false),
_ => {
assert!(type_is_sized(bcx.tcx(), t));
if type_needs_drop(bcx.tcx(), t) &&
ty::type_is_structural(t) {
iter_structural_ty(bcx, v0, t, |bb, vv, tt| drop_ty(bb, vv, tt, None))
} else {
bcx
}
}
}
}
pub fn declare_tydesc<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>)
-> tydesc_info<'tcx> {
assert!(!ccx.finished_tydescs().get());
let llty = type_of(ccx, t);
if ccx.sess().count_type_sizes() {
println!("{}\t{}", llsize_of_real(ccx, llty),
ppaux::ty_to_string(ccx.tcx(), t));
}
let llsize = llsize_of(ccx, llty);
let llalign = llalign_of(ccx, llty);
let name = mangle_internal_name_by_type_and_seq(ccx, t, "tydesc");
debug!("+++ declare_tydesc {} {}", ppaux::ty_to_string(ccx.tcx(), t), name);
let gvar = name.with_c_str(|buf| {
unsafe {
llvm::LLVMAddGlobal(ccx.llmod(), ccx.tydesc_type().to_ref(), buf)
}
});
note_unique_llvm_symbol(ccx, name);
let ty_name = token::intern_and_get_ident(
ppaux::ty_to_string(ccx.tcx(), t)[]);
let ty_name = C_str_slice(ccx, ty_name);
debug!("--- declare_tydesc {}", ppaux::ty_to_string(ccx.tcx(), t));
tydesc_info {
ty: t,
tydesc: gvar,
size: llsize,
align: llalign,
name: ty_name,
}
}
fn declare_generic_glue<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, t: Ty<'tcx>,
llfnty: Type, name: &str) -> (String, ValueRef) {
let _icx = push_ctxt("declare_generic_glue");
let fn_nm = mangle_internal_name_by_type_and_seq(
ccx,
t,
format!("glue_{}", name)[]);
let llfn = decl_cdecl_fn(ccx, fn_nm[], llfnty, ty::mk_nil(ccx.tcx()));
note_unique_llvm_symbol(ccx, fn_nm.clone());
return (fn_nm, llfn);
}
fn make_generic_glue<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
t: Ty<'tcx>,
llfn: ValueRef,
helper: for<'blk> |Block<'blk, 'tcx>, ValueRef, Ty<'tcx>|
-> Block<'blk, 'tcx>,
name: &str)
-> ValueRef {
let _icx = push_ctxt("make_generic_glue");
let glue_name = format!("glue {} {}", name, ty_to_short_str(ccx.tcx(), t));
let _s = StatRecorder::new(ccx, glue_name);
let arena = TypedArena::new();
let empty_param_substs = Substs::trans_empty();
let fcx = new_fn_ctxt(ccx, llfn, ast::DUMMY_NODE_ID, false,
ty::FnConverging(ty::mk_nil(ccx.tcx())),
&empty_param_substs, None, &arena);
let bcx = init_function(&fcx, false, ty::FnConverging(ty::mk_nil(ccx.tcx())));
update_linkage(ccx, llfn, None, OriginalTranslation);
ccx.stats().n_glues_created.set(ccx.stats().n_glues_created.get() + 1u);
let llrawptr0 = get_param(llfn, fcx.arg_pos(0) as c_uint);
let bcx = helper(bcx, llrawptr0, t);
finish_fn(&fcx, bcx, ty::FnConverging(ty::mk_nil(ccx.tcx())));
llfn
}
pub fn emit_tydescs(ccx: &CrateContext) {
let _icx = push_ctxt("emit_tydescs");
ccx.finished_tydescs().set(true);
let glue_fn_ty = Type::generic_glue_fn(ccx).ptr_to();
for (_, ti) in ccx.tydescs().borrow().iter() {
let drop_glue = unsafe {
llvm::LLVMConstPointerCast(get_drop_glue(ccx, ti.ty), glue_fn_ty.to_ref())
};
ccx.stats().n_real_glues.set(ccx.stats().n_real_glues.get() + 1);
let tydesc = C_named_struct(ccx.tydesc_type(),
&[ti.size,
ti.align,
drop_glue,
ti.name]);
unsafe {
let gvar = ti.tydesc;
llvm::LLVMSetInitializer(gvar, tydesc);
llvm::LLVMSetGlobalConstant(gvar, True);
llvm::SetLinkage(gvar, llvm::InternalLinkage);
}
};
}