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9200890ea3
Split out a new, low-level intrusive list type with clear semantics.
Unlike iplist (and ilist), all operations on simple_ilist are intrusive,
and simple_ilist never takes ownership of its nodes. This enables an
intuitive API that has the right defaults for intrusive lists.
- insert() takes references (not pointers!) to nodes (in iplist/ilist,
passing a reference will cause the node to be copied).
- erase() takes only iterators (like std::list), and does not destroy
the nodes.
- remove() takes only references and has the same behaviour as erase().
- clear() does not destroy the nodes.
- The destructor does not destroy the nodes.
- New API {erase,remove,clear}AndDispose() take an extra Disposer
functor for callsites that want to call some disposal routine (e.g.,
std::default_delete).
This list is not currently configurable, and has no callbacks.
The initial motivation was to fix iplist<>::sort to work correctly (even
with callbacks in ilist_traits<>). iplist<> uses simple_ilist<>::sort
directly. The new test in unittests/IR/ModuleTest.cpp crashes without
this commit.
Fixing sort() via a low-level layer provided a good opportunity to:
- Unit test the low-level functionality thoroughly.
- Modernize the API, largely inspired by other intrusive list
implementations.
Here's a sketch of a longer-term plan:
- Create BumpPtrList<>, a non-intrusive list implemented using
simple_ilist<>, and use it for the Token list in
lib/Support/YAMLParser.cpp. This will factor out the only real use of
createNode().
- Evolve the iplist<> and ilist<> APIs in the direction of
simple_ilist<>, making allocation/deallocation explicit at call sites
(similar to simple_ilist<>::eraseAndDispose()).
- Factor out remaining calls to createNode() and deleteNode() and remove
the customization from ilist_traits<>.
- Transition uses of iplist<>/ilist<> that don't need callbacks over to
simple_ilist<>.
llvm-svn: 280107
135 lines
3.3 KiB
C++
135 lines
3.3 KiB
C++
//===- unittests/ADT/IListIteratorTest.cpp - ilist_iterator unit tests ----===//
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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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#include "llvm/ADT/simple_ilist.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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struct Node : ilist_node<Node> {};
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TEST(IListIteratorTest, DefaultConstructor) {
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simple_ilist<Node>::iterator I;
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simple_ilist<Node>::reverse_iterator RI;
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simple_ilist<Node>::const_iterator CI;
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simple_ilist<Node>::const_reverse_iterator CRI;
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EXPECT_EQ(nullptr, I.getNodePtr());
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EXPECT_EQ(nullptr, CI.getNodePtr());
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EXPECT_EQ(nullptr, RI.getNodePtr());
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EXPECT_EQ(nullptr, CRI.getNodePtr());
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EXPECT_EQ(I, I);
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EXPECT_EQ(I, CI);
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EXPECT_EQ(CI, I);
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EXPECT_EQ(CI, CI);
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EXPECT_EQ(RI, RI);
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EXPECT_EQ(RI, CRI);
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EXPECT_EQ(CRI, RI);
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EXPECT_EQ(CRI, CRI);
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EXPECT_EQ(I, RI.getReverse());
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EXPECT_EQ(RI, I.getReverse());
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}
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TEST(IListIteratorTest, Empty) {
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simple_ilist<Node> L;
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// Check iterators of L.
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EXPECT_EQ(L.begin(), L.end());
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EXPECT_EQ(L.rbegin(), L.rend());
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// Reverse of end should be rend (since the sentinel sits on both sides).
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EXPECT_EQ(L.end(), L.rend().getReverse());
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EXPECT_EQ(L.rend(), L.end().getReverse());
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// Iterators shouldn't match default constructors.
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simple_ilist<Node>::iterator I;
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simple_ilist<Node>::reverse_iterator RI;
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EXPECT_NE(I, L.begin());
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EXPECT_NE(I, L.end());
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EXPECT_NE(RI, L.rbegin());
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EXPECT_NE(RI, L.rend());
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}
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TEST(IListIteratorTest, OneNodeList) {
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simple_ilist<Node> L;
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Node A;
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L.insert(L.end(), A);
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// Check address of reference.
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EXPECT_EQ(&A, &*L.begin());
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EXPECT_EQ(&A, &*L.rbegin());
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// Check that the handle matches.
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EXPECT_EQ(L.rbegin().getNodePtr(), L.begin().getNodePtr());
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// Check iteration.
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EXPECT_EQ(L.end(), ++L.begin());
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EXPECT_EQ(L.begin(), --L.end());
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EXPECT_EQ(L.rend(), ++L.rbegin());
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EXPECT_EQ(L.rbegin(), --L.rend());
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// Check conversions.
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EXPECT_EQ(L.rbegin(), L.begin().getReverse());
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EXPECT_EQ(L.begin(), L.rbegin().getReverse());
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}
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TEST(IListIteratorTest, TwoNodeList) {
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simple_ilist<Node> L;
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Node A, B;
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L.insert(L.end(), A);
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L.insert(L.end(), B);
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// Check order.
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EXPECT_EQ(&A, &*L.begin());
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EXPECT_EQ(&B, &*++L.begin());
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EXPECT_EQ(L.end(), ++++L.begin());
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EXPECT_EQ(&B, &*L.rbegin());
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EXPECT_EQ(&A, &*++L.rbegin());
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EXPECT_EQ(L.rend(), ++++L.rbegin());
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// Check conversions.
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EXPECT_EQ(++L.rbegin(), L.begin().getReverse());
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EXPECT_EQ(L.rbegin(), (++L.begin()).getReverse());
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EXPECT_EQ(++L.begin(), L.rbegin().getReverse());
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EXPECT_EQ(L.begin(), (++L.rbegin()).getReverse());
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}
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TEST(IListIteratorTest, CheckEraseForward) {
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simple_ilist<Node> L;
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Node A, B;
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L.insert(L.end(), A);
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L.insert(L.end(), B);
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// Erase nodes.
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auto I = L.begin();
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EXPECT_EQ(&A, &*I);
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L.remove(*I++);
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EXPECT_EQ(&B, &*I);
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L.remove(*I++);
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EXPECT_EQ(L.end(), I);
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}
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TEST(IListIteratorTest, CheckEraseReverse) {
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simple_ilist<Node> L;
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Node A, B;
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L.insert(L.end(), A);
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L.insert(L.end(), B);
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// Erase nodes.
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auto RI = L.rbegin();
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EXPECT_EQ(&B, &*RI);
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L.remove(*RI++);
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EXPECT_EQ(&A, &*RI);
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L.remove(*RI++);
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EXPECT_EQ(L.rend(), RI);
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}
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} // end namespace
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