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Reuse landing pads when possible

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Cuts the optimized rustc bin from 5.2 to 4.7MB
This commit is contained in:
Brian Anderson 2011-09-13 16:10:39 -07:00
parent e45c91135a
commit 74c39469be
2 changed files with 32 additions and 7 deletions
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27
src/comp/middle/trans.rs
View File

@ -3731,15 +3731,25 @@ fn invoke_(bcx: @block_ctxt, llfn: ValueRef,
// FIXME: May be worth turning this into a plain call when there are no
// cleanups to run
let normal_bcx = new_sub_block_ctxt(bcx, "normal return");
let unwind_bcx = new_sub_block_ctxt(bcx, "unwind");
let retval = invoker(bcx, llfn, llargs,
normal_bcx.llbb,
unwind_bcx.llbb);
trans_landing_pad(unwind_bcx);
get_landing_pad(bcx));
ret rslt(normal_bcx, retval);
}
fn trans_landing_pad(bcx: @block_ctxt) {
fn get_landing_pad(bcx: @block_ctxt) -> BasicBlockRef {
let scope_bcx = find_scope_cx(bcx);
if scope_bcx.cleanups_dirty {
let unwind_bcx = new_sub_block_ctxt(bcx, "unwind");
let lpadbb = trans_landing_pad(unwind_bcx);
scope_bcx.lpad = some(lpadbb);
scope_bcx.cleanups_dirty = false;
}
assert option::is_some(scope_bcx.lpad);
ret option::get(scope_bcx.lpad);
}
fn trans_landing_pad(bcx: @block_ctxt) -> BasicBlockRef {
// The landing pad return type (the type being propagated). Not sure what
// this represents but it's determined by the personality function and
// this is what the EH proposal example uses.
@ -3773,6 +3783,7 @@ fn trans_landing_pad(bcx: @block_ctxt) {
// Continue unwinding
Resume(bcx, llretval);
ret bcx.llbb;
}
fn trans_tup(cx: @block_ctxt, elts: [@ast::expr], id: ast::node_id) ->
@ -4522,6 +4533,8 @@ fn new_block_ctxt(cx: @fn_ctxt, parent: block_parent, kind: block_kind,
parent: parent,
kind: kind,
mutable cleanups: [],
mutable cleanups_dirty: true,
mutable lpad: option::none,
sp: cx.sp,
fcx: cx};
}
@ -4556,6 +4569,8 @@ fn new_raw_block_ctxt(fcx: @fn_ctxt, llbb: BasicBlockRef) -> @block_ctxt {
parent: parent_none,
kind: NON_SCOPE_BLOCK,
mutable cleanups: [],
mutable cleanups_dirty: true,
mutable lpad: option::none,
sp: fcx.sp,
fcx: fcx};
}
@ -4622,6 +4637,8 @@ fn llstaticallocas_block_ctxt(fcx: @fn_ctxt) -> @block_ctxt {
parent: parent_none,
kind: SCOPE_BLOCK,
mutable cleanups: [],
mutable cleanups_dirty: true,
mutable lpad: option::none,
sp: fcx.sp,
fcx: fcx};
}
@ -4632,6 +4649,8 @@ fn llderivedtydescs_block_ctxt(fcx: @fn_ctxt) -> @block_ctxt {
parent: parent_none,
kind: SCOPE_BLOCK,
mutable cleanups: [],
mutable cleanups_dirty: true,
mutable lpad: option::none,
sp: fcx.sp,
fcx: fcx};
}

12
src/comp/middle/trans_common.rs
View File

@ -270,7 +270,9 @@ tag cleanup {
}
fn add_clean(cx: @block_ctxt, val: ValueRef, ty: ty::t) {
find_scope_cx(cx).cleanups += [clean(bind drop_ty(_, val, ty))];
let scope_cx = find_scope_cx(cx);
scope_cx.cleanups += [clean(bind drop_ty(_, val, ty))];
scope_cx.cleanups_dirty = true;
}
fn add_clean_temp(cx: @block_ctxt, val: ValueRef, ty: ty::t) {
fn spill_and_drop(cx: @block_ctxt, val: ValueRef, ty: ty::t) ->
@ -281,8 +283,10 @@ fn add_clean_temp(cx: @block_ctxt, val: ValueRef, ty: ty::t) {
bcx = r.bcx;
ret drop_ty(bcx, spilled, ty);
}
find_scope_cx(cx).cleanups +=
let scope_cx = find_scope_cx(cx);
scope_cx.cleanups +=
[clean_temp(val, bind spill_and_drop(_, val, ty))];
scope_cx.cleanups_dirty = true;
}
// Note that this only works for temporaries. We should, at some point, move
@ -316,7 +320,7 @@ fn revoke_clean(cx: @block_ctxt, val: ValueRef, t: ty::t) -> @block_ctxt {
std::vec::slice(sc_cx.cleanups, 0u, found as uint) +
std::vec::slice(sc_cx.cleanups, (found as uint) + 1u,
std::vec::len(sc_cx.cleanups));
sc_cx.cleanups_dirty = true;
ret cx;
}
@ -389,6 +393,8 @@ type block_ctxt =
parent: block_parent,
kind: block_kind,
mutable cleanups: [cleanup],
mutable cleanups_dirty: bool,
mutable lpad: option::t<BasicBlockRef>,
sp: span,
fcx: @fn_ctxt};