368 lines
12 KiB
Rust
368 lines
12 KiB
Rust
import syntax::ast;
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import driver::session::session;
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import lib::llvm::{ValueRef, TypeRef};
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import back::abi;
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import base::{call_memmove,
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INIT, copy_val, load_if_immediate, get_tydesc,
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sub_block, do_spill_noroot,
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dest, bcx_icx, non_gc_box_cast};
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import syntax::codemap::span;
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import shape::llsize_of;
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import build::*;
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import common::*;
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import util::ppaux::ty_to_str;
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// Boxed vector types are in some sense currently a "shorthand" for a box
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// containing an unboxed vector. This expands a boxed vector type into such an
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// expanded type. It doesn't respect mutability, but that doesn't matter at
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// this point.
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fn expand_boxed_vec_ty(tcx: ty::ctxt, t: ty::t) -> ty::t {
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let unit_ty = ty::sequence_element_type(tcx, t);
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let unboxed_vec_ty = ty::mk_mut_unboxed_vec(tcx, unit_ty);
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alt ty::get(t).struct {
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ty::ty_estr(ty::vstore_uniq) | ty::ty_evec(_, ty::vstore_uniq) {
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ty::mk_imm_uniq(tcx, unboxed_vec_ty)
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}
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ty::ty_estr(ty::vstore_box) | ty::ty_evec(_, ty::vstore_box) {
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ty::mk_imm_box(tcx, unboxed_vec_ty)
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}
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_ { tcx.sess.bug(~"non boxed-vec type \
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in tvec::expand_boxed_vec_ty");
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}
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}
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}
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fn get_fill(bcx: block, vptr: ValueRef) -> ValueRef {
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let _icx = bcx.insn_ctxt(~"tvec::get_fill");
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Load(bcx, GEPi(bcx, vptr, ~[0u, abi::vec_elt_fill]))
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}
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fn set_fill(bcx: block, vptr: ValueRef, fill: ValueRef) {
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Store(bcx, fill, GEPi(bcx, vptr, ~[0u, abi::vec_elt_fill]));
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}
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fn get_alloc(bcx: block, vptr: ValueRef) -> ValueRef {
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Load(bcx, GEPi(bcx, vptr, ~[0u, abi::vec_elt_alloc]))
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}
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fn get_bodyptr(bcx: block, vptr: ValueRef) -> ValueRef {
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non_gc_box_cast(bcx, GEPi(bcx, vptr, ~[0u, abi::box_field_body]))
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}
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fn get_dataptr(bcx: block, vptr: ValueRef)
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-> ValueRef {
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let _icx = bcx.insn_ctxt(~"tvec::get_dataptr");
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GEPi(bcx, vptr, ~[0u, abi::vec_elt_elems, 0u])
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}
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fn pointer_add(bcx: block, ptr: ValueRef, bytes: ValueRef) -> ValueRef {
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let _icx = bcx.insn_ctxt(~"tvec::pointer_add");
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let old_ty = val_ty(ptr);
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let bptr = PointerCast(bcx, ptr, T_ptr(T_i8()));
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ret PointerCast(bcx, InBoundsGEP(bcx, bptr, ~[bytes]), old_ty);
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}
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fn alloc_raw(bcx: block, unit_ty: ty::t,
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fill: ValueRef, alloc: ValueRef, heap: heap) -> result {
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let _icx = bcx.insn_ctxt(~"tvec::alloc_uniq");
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let ccx = bcx.ccx();
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let vecbodyty = ty::mk_mut_unboxed_vec(bcx.tcx(), unit_ty);
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let vecsize = Add(bcx, alloc, llsize_of(ccx, ccx.opaque_vec_type));
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let {box, body} = base::malloc_general_dyn(bcx, vecbodyty, heap, vecsize);
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Store(bcx, fill, GEPi(bcx, body, ~[0u, abi::vec_elt_fill]));
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Store(bcx, alloc, GEPi(bcx, body, ~[0u, abi::vec_elt_alloc]));
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ret {bcx: bcx, val: box};
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}
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fn alloc_uniq_raw(bcx: block, unit_ty: ty::t,
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fill: ValueRef, alloc: ValueRef) -> result {
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alloc_raw(bcx, unit_ty, fill, alloc, heap_exchange)
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}
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fn alloc_vec(bcx: block, unit_ty: ty::t, elts: uint, heap: heap) -> result {
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let _icx = bcx.insn_ctxt(~"tvec::alloc_uniq");
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let ccx = bcx.ccx();
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let llunitty = type_of::type_of(ccx, unit_ty);
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let unit_sz = llsize_of(ccx, llunitty);
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let fill = Mul(bcx, C_uint(ccx, elts), unit_sz);
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let alloc = if elts < 4u { Mul(bcx, C_int(ccx, 4), unit_sz) }
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else { fill };
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let {bcx: bcx, val: vptr} = alloc_raw(bcx, unit_ty, fill, alloc, heap);
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ret {bcx: bcx, val: vptr};
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}
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fn duplicate_uniq(bcx: block, vptr: ValueRef, vec_ty: ty::t) -> result {
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let _icx = bcx.insn_ctxt(~"tvec::duplicate_uniq");
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let fill = get_fill(bcx, get_bodyptr(bcx, vptr));
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let unit_ty = ty::sequence_element_type(bcx.tcx(), vec_ty);
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let {bcx, val: newptr} = alloc_uniq_raw(bcx, unit_ty, fill, fill);
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let data_ptr = get_dataptr(bcx, get_bodyptr(bcx, vptr));
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let new_data_ptr = get_dataptr(bcx, get_bodyptr(bcx, newptr));
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call_memmove(bcx, new_data_ptr, data_ptr, fill);
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let bcx = if ty::type_needs_drop(bcx.tcx(), unit_ty) {
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iter_vec_raw(bcx, new_data_ptr, vec_ty, fill, base::take_ty)
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} else { bcx };
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ret rslt(bcx, newptr);
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}
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fn make_drop_glue_unboxed(bcx: block, vptr: ValueRef, vec_ty: ty::t) ->
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block {
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let _icx = bcx.insn_ctxt(~"tvec::make_drop_glue_unboxed");
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let tcx = bcx.tcx(), unit_ty = ty::sequence_element_type(tcx, vec_ty);
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if ty::type_needs_drop(tcx, unit_ty) {
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iter_vec_unboxed(bcx, vptr, vec_ty, base::drop_ty)
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} else { bcx }
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}
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fn trans_evec(bcx: block, args: ~[@ast::expr],
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vst: ast::vstore, id: ast::node_id, dest: dest) -> block {
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let _icx = bcx.insn_ctxt(~"tvec::trans_evec");
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let ccx = bcx.ccx();
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let mut bcx = bcx;
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if dest == base::ignore {
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for vec::each(args) |arg| {
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bcx = base::trans_expr(bcx, arg, base::ignore);
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}
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ret bcx;
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}
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let vec_ty = node_id_type(bcx, id);
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let unit_ty = ty::sequence_element_type(bcx.tcx(), vec_ty);
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let llunitty = type_of::type_of(ccx, unit_ty);
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let unit_sz = llsize_of(ccx, llunitty);
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let mut {bcx, val, dataptr} =
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alt vst {
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ast::vstore_fixed(_) {
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// Destination should be pre-allocated for us.
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let v = alt dest {
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base::save_in(v) {
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PointerCast(bcx, v, T_ptr(llunitty))
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}
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_ {
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bcx.ccx().sess.bug(~"bad dest for vstore_fixed \
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in tvec::trans_evec");
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}
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};
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{bcx: bcx, val: v, dataptr: v}
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}
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ast::vstore_slice(_) {
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let n = vec::len(args);
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// Make a fake type to use for the cleanup
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let ty = ty::mk_evec(bcx.tcx(),
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{ty: unit_ty, mutbl: ast::m_mutbl},
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ty::vstore_fixed(n));
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let n = C_uint(ccx, n);
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let vp = base::arrayalloca(bcx, llunitty, n);
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add_clean(bcx, vp, ty);
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let len = Mul(bcx, n, unit_sz);
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let p = base::alloca(bcx, T_struct(~[T_ptr(llunitty),
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ccx.int_type]));
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Store(bcx, vp, GEPi(bcx, p, ~[0u, abi::slice_elt_base]));
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Store(bcx, len, GEPi(bcx, p, ~[0u, abi::slice_elt_len]));
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{bcx: bcx, val: p, dataptr: vp}
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}
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ast::vstore_uniq {
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let {bcx, val} = alloc_vec(bcx, unit_ty, args.len(),
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heap_exchange);
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add_clean_free(bcx, val, heap_exchange);
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let dataptr = get_dataptr(bcx, get_bodyptr(bcx, val));
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{bcx: bcx, val: val, dataptr: dataptr}
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}
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ast::vstore_box {
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let {bcx, val} = alloc_vec(bcx, unit_ty, args.len(),
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heap_shared);
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add_clean_free(bcx, val, heap_shared);
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let dataptr = get_dataptr(bcx, get_bodyptr(bcx, val));
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{bcx: bcx, val: val, dataptr: dataptr}
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}
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};
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// Store the individual elements.
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let mut i = 0u, temp_cleanups = ~[val];
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#debug("trans_evec: v: %s, dataptr: %s",
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val_str(ccx.tn, val),
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val_str(ccx.tn, dataptr));
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for vec::each(args) |e| {
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let lleltptr = InBoundsGEP(bcx, dataptr, ~[C_uint(ccx, i)]);
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bcx = base::trans_expr_save_in(bcx, e, lleltptr);
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add_clean_temp_mem(bcx, lleltptr, unit_ty);
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vec::push(temp_cleanups, lleltptr);
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i += 1u;
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}
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for vec::each(temp_cleanups) |cln| { revoke_clean(bcx, cln); }
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alt vst {
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ast::vstore_fixed(_) {
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// We wrote into the destination in the fixed case.
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ret bcx;
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}
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ast::vstore_slice(_) {
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ret base::store_in_dest(bcx, Load(bcx, val), dest);
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}
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_ {
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ret base::store_in_dest(bcx, val, dest);
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}
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}
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}
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fn trans_vstore(bcx: block, e: @ast::expr,
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v: ast::vstore, dest: dest) -> block {
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alt e.node {
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ast::expr_lit(@{node: ast::lit_str(s), span: _}) {
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ret trans_estr(bcx, s, v, dest);
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}
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ast::expr_vec(es, mutbl) {
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ret trans_evec(bcx, es, v, e.id, dest);
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}
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_ {
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bcx.sess().span_bug(e.span, ~"vstore on non-sequence type");
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}
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}
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}
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fn get_base_and_len(cx: block, v: ValueRef, e_ty: ty::t)
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-> (ValueRef, ValueRef) {
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let ccx = cx.ccx();
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let tcx = ccx.tcx;
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let vec_ty = ty::type_autoderef(tcx, e_ty);
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let unit_ty = ty::sequence_element_type(tcx, vec_ty);
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let llunitty = type_of::type_of(ccx, unit_ty);
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let unit_sz = llsize_of(ccx, llunitty);
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let vstore = alt ty::get(vec_ty).struct {
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ty::ty_estr(vst) | ty::ty_evec(_, vst) { vst }
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_ { ty::vstore_uniq }
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};
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alt vstore {
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ty::vstore_fixed(n) {
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let base = GEPi(cx, v, ~[0u, 0u]);
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let n = if ty::type_is_str(e_ty) { n + 1u } else { n };
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let len = Mul(cx, C_uint(ccx, n), unit_sz);
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(base, len)
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}
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ty::vstore_slice(_) {
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let base = Load(cx, GEPi(cx, v, ~[0u, abi::slice_elt_base]));
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let len = Load(cx, GEPi(cx, v, ~[0u, abi::slice_elt_len]));
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(base, len)
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}
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ty::vstore_uniq | ty::vstore_box {
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#debug["get_base_and_len: %s", val_str(ccx.tn, v)];
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let body = tvec::get_bodyptr(cx, v);
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(tvec::get_dataptr(cx, body), tvec::get_fill(cx, body))
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}
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}
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}
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fn trans_estr(bcx: block, s: @~str, vstore: ast::vstore,
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dest: dest) -> block {
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let _icx = bcx.insn_ctxt(~"tvec::trans_estr");
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if dest == base::ignore { ret bcx; }
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let ccx = bcx.ccx();
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let c = alt vstore {
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ast::vstore_fixed(_)
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{
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// "hello"/_ => "hello"/5 => ~[i8 x 6] in llvm
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#debug("trans_estr: fixed: %s", *s);
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C_postr(*s)
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}
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ast::vstore_slice(_) {
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// "hello" => (*i8, 6u) in llvm
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#debug("trans_estr: slice '%s'", *s);
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C_estr_slice(ccx, *s)
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}
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ast::vstore_uniq {
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let cs = PointerCast(bcx, C_cstr(ccx, *s), T_ptr(T_i8()));
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let len = C_uint(ccx, str::len(*s));
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let c = Call(bcx, ccx.upcalls.str_new_uniq, ~[cs, len]);
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PointerCast(bcx, c,
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T_unique_ptr(T_unique(ccx, T_vec(ccx, T_i8()))))
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}
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ast::vstore_box {
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let cs = PointerCast(bcx, C_cstr(ccx, *s), T_ptr(T_i8()));
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let len = C_uint(ccx, str::len(*s));
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let c = Call(bcx, ccx.upcalls.str_new_shared, ~[cs, len]);
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PointerCast(bcx, c,
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T_box_ptr(T_box(ccx, T_vec(ccx, T_i8()))))
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}
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};
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#debug("trans_estr: type: %s", val_str(ccx.tn, c));
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base::store_in_dest(bcx, c, dest)
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}
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type val_and_ty_fn = fn@(block, ValueRef, ty::t) -> result;
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type iter_vec_block = fn(block, ValueRef, ty::t) -> block;
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fn iter_vec_raw(bcx: block, data_ptr: ValueRef, vec_ty: ty::t,
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fill: ValueRef, f: iter_vec_block) -> block {
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let _icx = bcx.insn_ctxt(~"tvec::iter_vec_raw");
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let unit_ty = ty::sequence_element_type(bcx.tcx(), vec_ty);
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// Calculate the last pointer address we want to handle.
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// FIXME (#2536): Optimize this when the size of the unit type is
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// statically known to not use pointer casts, which tend to confuse
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// LLVM.
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let data_end_ptr = pointer_add(bcx, data_ptr, fill);
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// Now perform the iteration.
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let header_cx = sub_block(bcx, ~"iter_vec_loop_header");
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Br(bcx, header_cx.llbb);
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let data_ptr =
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Phi(header_cx, val_ty(data_ptr), ~[data_ptr], ~[bcx.llbb]);
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let not_yet_at_end =
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ICmp(header_cx, lib::llvm::IntULT, data_ptr, data_end_ptr);
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let body_cx = sub_block(header_cx, ~"iter_vec_loop_body");
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let next_cx = sub_block(header_cx, ~"iter_vec_next");
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CondBr(header_cx, not_yet_at_end, body_cx.llbb, next_cx.llbb);
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let body_cx = f(body_cx, data_ptr, unit_ty);
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AddIncomingToPhi(data_ptr, InBoundsGEP(body_cx, data_ptr,
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~[C_int(bcx.ccx(), 1)]),
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body_cx.llbb);
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Br(body_cx, header_cx.llbb);
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ret next_cx;
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}
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fn iter_vec_uniq(bcx: block, vptr: ValueRef, vec_ty: ty::t,
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fill: ValueRef, f: iter_vec_block) -> block {
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let _icx = bcx.insn_ctxt(~"tvec::iter_vec_uniq");
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let data_ptr = get_dataptr(bcx, get_bodyptr(bcx, vptr));
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iter_vec_raw(bcx, data_ptr, vec_ty, fill, f)
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}
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fn iter_vec_unboxed(bcx: block, body_ptr: ValueRef, vec_ty: ty::t,
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f: iter_vec_block) -> block {
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let _icx = bcx.insn_ctxt(~"tvec::iter_vec_unboxed");
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let fill = get_fill(bcx, body_ptr);
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let dataptr = get_dataptr(bcx, body_ptr);
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ret iter_vec_raw(bcx, dataptr, vec_ty, fill, f);
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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