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hanchenye-llvm-project/llvm/unittests/ADT/IListNodeTest.cpp

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ADT: Add sentinel tracking and custom tags to ilists 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
2016-09-12 00:20:53 +08:00
//===- unittests/ADT/IListNodeTest.cpp - ilist_node unit tests ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/ilist_node.h"
#include "gtest/gtest.h"
#include <type_traits>
using namespace llvm;
using namespace llvm::ilist_detail;
namespace {
struct Node;
struct TagA {};
struct TagB {};
TEST(IListNodeTest, Options) {
static_assert(
std::is_same<compute_node_options<Node>::type,
compute_node_options<Node, ilist_tag<void>>::type>::value,
"default tag is void");
static_assert(
!std::is_same<compute_node_options<Node, ilist_tag<TagA>>::type,
compute_node_options<Node, ilist_tag<void>>::type>::value,
"default tag is void, different from TagA");
static_assert(
!std::is_same<compute_node_options<Node, ilist_tag<TagA>>::type,
compute_node_options<Node, ilist_tag<TagB>>::type>::value,
"TagA is not TagB");
static_assert(
std::is_same<
compute_node_options<Node, ilist_sentinel_tracking<false>>::type,
compute_node_options<Node, ilist_sentinel_tracking<false>,
ilist_tag<void>>::type>::value,
"default tag is void, even with sentinel tracking off");
static_assert(
std::is_same<
compute_node_options<Node, ilist_sentinel_tracking<false>>::type,
compute_node_options<Node, ilist_tag<void>,
ilist_sentinel_tracking<false>>::type>::value,
"order shouldn't matter");
static_assert(
std::is_same<
compute_node_options<Node, ilist_sentinel_tracking<true>>::type,
compute_node_options<Node, ilist_sentinel_tracking<true>,
ilist_tag<void>>::type>::value,
"default tag is void, even with sentinel tracking on");
static_assert(
std::is_same<
compute_node_options<Node, ilist_sentinel_tracking<true>>::type,
compute_node_options<Node, ilist_tag<void>,
ilist_sentinel_tracking<true>>::type>::value,
"order shouldn't matter");
static_assert(
std::is_same<
compute_node_options<Node, ilist_sentinel_tracking<true>,
ilist_tag<TagA>>::type,
compute_node_options<Node, ilist_tag<TagA>,
ilist_sentinel_tracking<true>>::type>::value,
"order shouldn't matter with real tags");
}
} // end namespace