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Use annotations on blocks 

Previously, block_ty returned the type of the terminating
expression of the block (or nil if said expression was absent).
I changed check_expr to write the type of that expression into
the annotation for the block itself, so now block_ty can use the
block's annotation.
This commit is contained in:
Tim Chevalier 2011-05-27 12:03:39 -07:00
parent a7a42c24be
commit 0cbcf92749
2 changed files with 9 additions and 10 deletions
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5
src/comp/middle/ty.rs
View File

@ -1716,10 +1716,7 @@ fn stmt_ty(&ctxt cx, &@ast::stmt s) -> t {
}
fn block_ty(&ctxt cx, &ast::block b) -> t {
alt (b.node.expr) {
case (some[@ast::expr](?e)) { ret expr_ty(cx, e); }
case (none[@ast::expr]) { ret mk_nil(cx); }
}
ret ann_to_type(cx.node_types, b.node.a);
}
// Returns the type of a pattern as a monotype. Like @expr_ty, this function

14
src/comp/middle/typeck.rs
View File

@ -1376,6 +1376,7 @@ mod pushdown {
auto t = demand::autoderef(scx, e.span, expected,
ann_to_type(scx.fcx.ccx.tcx.node_types, ann), adk);
write::ty_only_fixup(scx, ann.id, t);
pushdown_block(scx, t, bloc);
}
case (ast::expr_assign(?lhs_0, ?rhs_0, ?ann)) {
auto t = demand::autoderef(scx, e.span, expected,
@ -1517,14 +1518,13 @@ mod pushdown {
alt (bloc.node.expr) {
case (some[@ast::expr](?e_0)) {
pushdown_expr(scx, expected, e_0);
write::nil_ty(scx.fcx.ccx.tcx, bloc.node.a.id);
}
case (none[@ast::expr]) {
demand::simple(scx, bloc.span, expected,
ty::mk_nil(scx.fcx.ccx.tcx));
write::nil_ty(scx.fcx.ccx.tcx, bloc.node.a.id);
/* empty */
}
}
demand::simple(scx, bloc.span, expected,
ann_to_type(scx.fcx.ccx.tcx.node_types, bloc.node.a));
}
}
@ -2746,15 +2746,17 @@ fn check_block(&@stmt_ctxt scx, &ast::block block) {
for (@ast::stmt s in block.node.stmts) { check_stmt(scx.fcx, s); }
alt (block.node.expr) {
case (none[@ast::expr]) { /* empty */ }
case (none[@ast::expr]) {
write::nil_ty(scx.fcx.ccx.tcx, block.node.a.id);
}
case (some[@ast::expr](?e)) {
check_expr(scx, e);
auto ety = expr_ty(scx.fcx.ccx.tcx, e);
pushdown::pushdown_expr(scx, ety, e);
write::ty_only_fixup(scx, block.node.a.id, ety);
}
}
write::nil_ty(scx.fcx.ccx.tcx, block.node.a.id);
}
fn check_const(&@crate_ctxt ccx, &span sp, &@ast::expr e, &ast::ann ann) {