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This adds two declarative configuration options for intrusive lists
(available for simple_ilist, iplist, and ilist). Both of these options
affect ilist_node interoperability and need to be passed both to the
node and the list. Instead of adding a new traits class, they're
specified as optional template parameters (in any order).
The two options:
1. Pass ilist_sentinel_tracking<true> or ilist_sentinel_tracking<false>
to control whether there's a bit on ilist_node "prev" pointer
indicating whether it's the sentinel. The default behaviour is to
use a bit if and only if LLVM_ENABLE_ABI_BREAKING_CHECKS.
2. Pass ilist_tag<TagA> and ilist_tag<TagB> to allow insertion of a
single node into two different lists (simultaneously).
I have an immediate use-case for (1) ilist_sentinel_tracking: fixing the
validation semantics of MachineBasicBlock::reverse_iterator to match
ilist::reverse_iterator (ala r280032: see the comments at the end of the
commit message there). I'm adding (2) ilist_tag in the same commit to
validate that the options framework supports expansion. Justin Bogner
mentioned this might enable a possible cleanup in SelectionDAG, but I'll
leave this to others to explore. In the meantime, the unit tests and
the comments for simple_ilist and ilist_node have usage examples.
Note that there's a layer of indirection to support optional,
out-of-order, template paramaters. Internal classes are templated on an
instantiation of the non-variadic ilist_detail::node_options.
User-facing classes use ilist_detail::compute_node_options to compute
the correct instantiation of ilist_detail::node_options.
The comments for ilist_detail::is_valid_option describe how to add new
options (e.g., ilist_packed_int<int NumBits>).
llvm-svn: 281167
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
//===- llvm/ADT/ilist_base.h - Intrusive List Base ---------------*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ILIST_BASE_H
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#define LLVM_ADT_ILIST_BASE_H
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#include "llvm/ADT/ilist_node_base.h"
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#include <cassert>
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#include <cstddef>
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#include <type_traits>
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namespace llvm {
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/// Implementations of list algorithms using ilist_node_base.
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template <bool EnableSentinelTracking> class ilist_base {
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public:
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typedef ilist_node_base<EnableSentinelTracking> node_base_type;
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static void insertBeforeImpl(node_base_type &Next, node_base_type &N) {
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node_base_type &Prev = *Next.getPrev();
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N.setNext(&Next);
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N.setPrev(&Prev);
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Prev.setNext(&N);
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Next.setPrev(&N);
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}
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static void removeImpl(node_base_type &N) {
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node_base_type *Prev = N.getPrev();
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node_base_type *Next = N.getNext();
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Next->setPrev(Prev);
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Prev->setNext(Next);
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// Not strictly necessary, but helps catch a class of bugs.
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N.setPrev(nullptr);
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N.setNext(nullptr);
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}
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static void removeRangeImpl(node_base_type &First, node_base_type &Last) {
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node_base_type *Prev = First.getPrev();
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node_base_type *Final = Last.getPrev();
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Last.setPrev(Prev);
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Prev->setNext(&Last);
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// Not strictly necessary, but helps catch a class of bugs.
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First.setPrev(nullptr);
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Final->setNext(nullptr);
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}
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static void transferBeforeImpl(node_base_type &Next, node_base_type &First,
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node_base_type &Last) {
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if (&Next == &Last || &First == &Last)
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return;
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// Position cannot be contained in the range to be transferred.
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assert(&Next != &First &&
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// Check for the most common mistake.
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"Insertion point can't be one of the transferred nodes");
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node_base_type &Final = *Last.getPrev();
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// Detach from old list/position.
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First.getPrev()->setNext(&Last);
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Last.setPrev(First.getPrev());
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// Splice [First, Final] into its new list/position.
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node_base_type &Prev = *Next.getPrev();
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Final.setNext(&Next);
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First.setPrev(&Prev);
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Prev.setNext(&First);
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Next.setPrev(&Final);
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}
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template <class T> static void insertBefore(T &Next, T &N) {
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insertBeforeImpl(Next, N);
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}
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template <class T> static void remove(T &N) { removeImpl(N); }
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template <class T> static void removeRange(T &First, T &Last) {
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removeRangeImpl(First, Last);
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}
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template <class T> static void transferBefore(T &Next, T &First, T &Last) {
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transferBeforeImpl(Next, First, Last);
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}
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};
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} // end namespace llvm
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#endif // LLVM_ADT_ILIST_BASE_H
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