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rustc: Determine the region of pointer dereference expressions

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This commit is contained in:
Patrick Walton 2012-03-14 15:12:09 -07:00
parent 1600be2c3b
commit 1ed768bc3b
1 changed files with 16 additions and 6 deletions
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22
src/rustc/middle/typeck.rs
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@ -1933,8 +1933,8 @@ fn lookup_field_ty(cx: ty::ctxt, items:[@ast::class_item],
/*
* Returns the region that the value named by the given expression lives in.
* If the expression is not an lvalue, reports an error and returns the block
* region.
* The expression must have been typechecked. If the expression is not an
* lvalue, returns the block region.
*
* Note that borrowing is not detected here, because we would have to
* immediately structurally resolve too many types otherwise. Thus the
@ -1958,10 +1958,20 @@ fn region_of(fcx: @fn_ctxt, expr: @ast::expr) -> ty::region {
}
}
}
ast::expr_field(base, _, _) | ast::expr_index(base, _) |
ast::expr_unary(ast::deref, base) {
fcx.ccx.tcx.sess.span_unimpl(expr.span, "regions of field, " +
"index, or deref operations");
ast::expr_field(base, _, _) | ast::expr_index(base, _) {
fcx.ccx.tcx.sess.span_unimpl(expr.span, "regions of field or " +
"index operations");
}
ast::expr_unary(ast::deref, base) {
let expr_ty = ty::expr_ty(fcx.ccx.tcx, base);
let expr_ty = structurally_resolved_type(fcx, expr.span, expr_ty);
alt ty::get(expr_ty).struct {
ty::ty_rptr(region, _) { region }
ty::ty_box(_) | ty::ty_uniq(_) {
fcx.ccx.tcx.sess.span_unimpl(expr.span, "borrowing");
}
_ { ret region_of(fcx, base); }
}
}
_ {
let blk_id = fcx.ccx.tcx.region_map.rvalue_to_block.get(expr.id);