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Make trans understand by-ref bindings

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Issue #918
This commit is contained in:
Marijn Haverbeke 2011-09-15 14:00:58 +02:00
parent 8aad16112b
commit d7a1d6a1cb
1 changed files with 19 additions and 8 deletions
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27
src/comp/middle/trans.rs
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@ -4444,7 +4444,7 @@ fn trans_be(cx: @block_ctxt, e: @ast::expr) : ast_util::is_call_expr(e) ->
ret trans_ret(cx, some(e));
}
fn init_local(bcx: @block_ctxt, local: @ast::local) -> result {
fn init_local(bcx: @block_ctxt, local: @ast::local) -> @block_ctxt {
let ty = node_id_type(bcx_ccx(bcx), local.node.id);
let llptr = bcx.fcx.lllocals.get(local.node.id);
// Make a note to drop this slot on the way out.
@ -4476,7 +4476,7 @@ fn init_local(bcx: @block_ctxt, local: @ast::local) -> result {
bcx =
trans_alt::bind_irrefutable_pat(bcx, local.node.pat, llptr,
bcx.fcx.lllocals, false);
ret rslt(bcx, llptr);
ret bcx;
fn must_zero(ccx: @crate_ctxt, local: @ast::local) -> bool {
alt local.node.init {
@ -4513,6 +4513,14 @@ fn init_local(bcx: @block_ctxt, local: @ast::local) -> result {
}
}
fn init_ref_local(bcx: @block_ctxt, local: @ast::local) -> @block_ctxt {
let init_expr = option::get(local.node.init).expr;
let val = trans_lval(bcx, init_expr);
assert val.is_mem;
ret trans_alt::bind_irrefutable_pat(bcx, local.node.pat, val.res.val,
bcx.fcx.lllocals, false);
}
fn zero_alloca(cx: @block_ctxt, llptr: ValueRef, t: ty::t) -> result {
let bcx = cx;
let ccx = bcx_ccx(cx);
@ -4538,8 +4546,12 @@ fn trans_stmt(cx: @block_ctxt, s: ast::stmt) -> result {
ast::stmt_decl(d, _) {
alt d.node {
ast::decl_local(locals) {
for (_, local) in locals {
bcx = init_local(bcx, local).bcx;
for (style, local) in locals {
if style == ast::let_copy {
bcx = init_local(bcx, local);
} else {
bcx = init_ref_local(bcx, local);
}
}
}
ast::decl_item(i) { trans_item(cx.fcx.lcx, *i); }
@ -4646,15 +4658,14 @@ fn trans_fn_cleanups(fcx: @fn_ctxt, cx: @block_ctxt) {
}
iter block_locals(b: ast::blk) -> @ast::local {
// FIXME: putting from inside an iter block doesn't work, so we can't
// use the index here.
for s: @ast::stmt in b.node.stmts {
alt s.node {
ast::stmt_decl(d, _) {
alt d.node {
ast::decl_local(locals) {
for (_, local) in locals { put local; }
for (style, local) in locals {
if style == ast::let_copy { put local; }
}
}
_ {/* fall through */ }
}