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Try harder still to generate fewer landing pads

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Scopes that don't have cleanups don't need their own landing pads

This takes the optimized rustc bin from 4.7MB to 4.4
This commit is contained in:
Brian Anderson 2011-09-13 16:40:18 -07:00
parent b8e31ac469
commit 6d3dd0e48c
1 changed files with 19 additions and 1 deletions
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20
src/comp/middle/trans.rs
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@ -3738,7 +3738,7 @@ fn invoke_(bcx: @block_ctxt, llfn: ValueRef,
}
fn get_landing_pad(bcx: @block_ctxt) -> BasicBlockRef {
let scope_bcx = find_scope_cx(bcx);
let scope_bcx = find_scope_for_lpad(bcx);
if scope_bcx.need_new_lpad {
let unwind_bcx = new_sub_block_ctxt(bcx, "unwind");
let lpadbb = trans_landing_pad(unwind_bcx);
@ -3747,6 +3747,24 @@ fn get_landing_pad(bcx: @block_ctxt) -> BasicBlockRef {
}
assert option::is_some(scope_bcx.lpad);
ret option::get(scope_bcx.lpad);
fn find_scope_for_lpad(bcx: @block_ctxt) -> @block_ctxt {
let scope_bcx = bcx;
while true {
scope_bcx = find_scope_cx(scope_bcx);
if vec::is_not_empty(scope_bcx.cleanups) {
ret scope_bcx;
} else {
scope_bcx = alt scope_bcx.parent {
parent_some(b) { b }
parent_none. {
ret scope_bcx;
}
}
}
}
fail;
}
}
fn trans_landing_pad(bcx: @block_ctxt) -> BasicBlockRef {