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bd2bad88ac
At the moment, ReversePostOrderTraversal performs a post-order walk on the entry node of the passed in graph, rather than the graph type itself. If GT::NodeRef is the same as GraphT, everything works as expected and this is the case for the current uses in-tree. But it does not work as expected if GraphT != GT::NodeRef. In that case, we either fail to build (if there is no GraphTrait specialization for GT:NodeRef) or we pick the GraphTrait specialization for GT::NodeRef, instead of the specialization of GraphT. Both the depth-first and post-order iterators pick the expected specalization and this patch updates ReversePostOrderTraversal to delegate to po_begin & po_end to pick the right specialization, rather than forcing using GraphTraits<GT::NodeRef>, by first getting the entry node. This makes `ReversePostOrderTraversal<Graph<6>> RPOT(G);` build and work as expected in the test. Reviewed By: dexonsmith Differential Revision: https://reviews.llvm.org/D100169
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
//===- PostOrderIteratorTest.cpp - PostOrderIterator unit tests -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/PostOrderIterator.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/CFG.h"
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#include "gtest/gtest.h"
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#include "TestGraph.h"
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using namespace llvm;
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namespace {
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// Whether we're able to compile
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TEST(PostOrderIteratorTest, Compiles) {
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typedef SmallPtrSet<void *, 4> ExtSetTy;
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// Tests that template specializations are kept up to date
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void *Null = nullptr;
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po_iterator_storage<std::set<void *>, false> PIS;
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PIS.insertEdge(Optional<void *>(), Null);
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ExtSetTy Ext;
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po_iterator_storage<ExtSetTy, true> PISExt(Ext);
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PIS.insertEdge(Optional<void *>(), Null);
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// Test above, but going through po_iterator (which inherits from template
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// base)
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BasicBlock *NullBB = nullptr;
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auto PI = po_end(NullBB);
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PI.insertEdge(Optional<BasicBlock *>(), NullBB);
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auto PIExt = po_ext_end(NullBB, Ext);
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PIExt.insertEdge(Optional<BasicBlock *>(), NullBB);
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}
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// Test post-order and reverse post-order traversals for simple graph type.
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TEST(PostOrderIteratorTest, PostOrderAndReversePostOrderTraverrsal) {
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Graph<6> G;
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G.AddEdge(0, 1);
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G.AddEdge(0, 2);
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G.AddEdge(0, 3);
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G.AddEdge(1, 4);
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G.AddEdge(2, 5);
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G.AddEdge(5, 2);
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G.AddEdge(2, 4);
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G.AddEdge(1, 4);
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SmallVector<int> FromIterator;
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for (auto N : post_order(G))
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FromIterator.push_back(N->first);
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EXPECT_EQ(6u, FromIterator.size());
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EXPECT_EQ(4, FromIterator[0]);
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EXPECT_EQ(1, FromIterator[1]);
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EXPECT_EQ(5, FromIterator[2]);
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EXPECT_EQ(2, FromIterator[3]);
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EXPECT_EQ(3, FromIterator[4]);
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EXPECT_EQ(0, FromIterator[5]);
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FromIterator.clear();
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ReversePostOrderTraversal<Graph<6>> RPOT(G);
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for (auto N : RPOT)
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FromIterator.push_back(N->first);
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EXPECT_EQ(6u, FromIterator.size());
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EXPECT_EQ(0, FromIterator[0]);
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EXPECT_EQ(3, FromIterator[1]);
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EXPECT_EQ(2, FromIterator[2]);
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EXPECT_EQ(5, FromIterator[3]);
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EXPECT_EQ(1, FromIterator[4]);
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EXPECT_EQ(4, FromIterator[5]);
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}
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}
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