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[LCG] Add some basic methods for querying the parent/child relationships

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of SCCs in the SCC DAG. Exercise them in the big graph test case. These
will be especially useful for establishing invariants in insertion
logic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207749 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-05-01 12:12:42 +00:00
parent 217b5866d1
commit b8f462501b
3 changed files with 49 additions and 0 deletions
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14
include/llvm/Analysis/LazyCallGraph.h
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@ -238,6 +238,20 @@ public:
return iterator_range<parent_iterator>(parent_begin(), parent_end());
}
/// \brief Test if this SCC is a parent of \a C.
bool isParentOf(const SCC &C) const { return C.isChildOf(*this); }
/// \brief Test if this SCC is an ancestor of \a C.
bool isAncestorOf(const SCC &C) const { return C.isDescendantOf(*this); }
/// \brief Test if this SCC is a child of \a C.
bool isChildOf(const SCC &C) const {
return ParentSCCs.count(const_cast<SCC *>(&C));
}
/// \brief Test if this SCC is a descendant of \a C.
bool isDescendantOf(const SCC &C) const;
///@{
/// \name Mutation API
///

15
lib/Analysis/LazyCallGraph.cpp
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@ -162,6 +162,21 @@ void LazyCallGraph::SCC::insert(Node &N) {
G->SCCMap[&N] = this;
}
bool LazyCallGraph::SCC::isDescendantOf(const SCC &C) const {
// Walk up the parents of this SCC and verify that we eventually find C.
SmallVector<const SCC *, 4> AncestorWorklist;
AncestorWorklist.push_back(this);
do {
const SCC *AncestorC = AncestorWorklist.pop_back_val();
if (AncestorC->isChildOf(C))
return true;
for (const SCC *ParentC : AncestorC->ParentSCCs)
AncestorWorklist.push_back(ParentC);
} while (!AncestorWorklist.empty());
return false;
}
void LazyCallGraph::SCC::insertIntraSCCEdge(Node &CallerN, Node &CalleeN) {
// First insert it into the caller.
CallerN.insertEdgeInternal(CalleeN);

20
unittests/Analysis/LazyCallGraphTest.cpp
View File

@ -214,6 +214,10 @@ TEST(LazyCallGraphTest, BasicGraphFormation) {
EXPECT_EQ("d2", Nodes[1]);
EXPECT_EQ("d3", Nodes[2]);
Nodes.clear();
EXPECT_FALSE(D.isParentOf(D));
EXPECT_FALSE(D.isChildOf(D));
EXPECT_FALSE(D.isAncestorOf(D));
EXPECT_FALSE(D.isDescendantOf(D));
LazyCallGraph::SCC &C = *SCCI++;
for (LazyCallGraph::Node *N : C)
@ -224,6 +228,10 @@ TEST(LazyCallGraphTest, BasicGraphFormation) {
EXPECT_EQ("c2", Nodes[1]);
EXPECT_EQ("c3", Nodes[2]);
Nodes.clear();
EXPECT_TRUE(C.isParentOf(D));
EXPECT_FALSE(C.isChildOf(D));
EXPECT_TRUE(C.isAncestorOf(D));
EXPECT_FALSE(C.isDescendantOf(D));
LazyCallGraph::SCC &B = *SCCI++;
for (LazyCallGraph::Node *N : B)
@ -234,6 +242,12 @@ TEST(LazyCallGraphTest, BasicGraphFormation) {
EXPECT_EQ("b2", Nodes[1]);
EXPECT_EQ("b3", Nodes[2]);
Nodes.clear();
EXPECT_TRUE(B.isParentOf(D));
EXPECT_FALSE(B.isChildOf(D));
EXPECT_TRUE(B.isAncestorOf(D));
EXPECT_FALSE(B.isDescendantOf(D));
EXPECT_FALSE(B.isAncestorOf(C));
EXPECT_FALSE(C.isAncestorOf(B));
LazyCallGraph::SCC &A = *SCCI++;
for (LazyCallGraph::Node *N : A)
@ -244,6 +258,12 @@ TEST(LazyCallGraphTest, BasicGraphFormation) {
EXPECT_EQ("a2", Nodes[1]);
EXPECT_EQ("a3", Nodes[2]);
Nodes.clear();
EXPECT_TRUE(A.isParentOf(B));
EXPECT_TRUE(A.isParentOf(C));
EXPECT_FALSE(A.isParentOf(D));
EXPECT_TRUE(A.isAncestorOf(B));
EXPECT_TRUE(A.isAncestorOf(C));
EXPECT_TRUE(A.isAncestorOf(D));
EXPECT_EQ(CG.postorder_scc_end(), SCCI);
}