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Only use allocas to hold expression results for boxed types

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This commit is contained in:
Brian Anderson 2011-03-31 22:32:02 -04:00
parent f05d3c516b
commit 524e803582
1 changed files with 3 additions and 18 deletions
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21
src/comp/middle/trans.rs
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@ -5393,25 +5393,10 @@ fn trans_block(@block_ctxt cx, &ast.block b) -> result {
auto r_ty = ty.expr_ty(e); auto r_ty = ty.expr_ty(e);
fn is_nil(@ty.t r_ty) -> bool { if (ty.type_is_boxed(r_ty)) {
alt (r_ty.struct) {
case (ty.ty_nil) {
ret true;
}
case (_) {
ret false;
}
}
}
// FIXME: This is a temporary hack to prevent compile // Create an alloca up in the llallocas block to hold the
// failures. There's some expression variant that claims // expression result.
// to be ty_nil but but does not translate to T_nil. Need
// to hunt it down. Of course, if we're talking about nil,
// do we really want to do this whole business anyway?
if (!is_nil(r_ty)) {
// This alloca is declared at the function level, above
// the block scope
auto res_alloca = alloc_ty(bcx, r_ty); auto res_alloca = alloc_ty(bcx, r_ty);
bcx = res_alloca.bcx; bcx = res_alloca.bcx;
auto res_copy = copy_ty(bcx, INIT, auto res_copy = copy_ty(bcx, INIT,