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llvm-mirror/unittests/Analysis/LazyCallGraphTest.cpp
Fangrui Song c9829bfb08 [LazyCallGraph] Build SCCs of the reference graph in order 
```
// The legacy PM CGPassManager discovers SCCs this way:
for function in the source order
  tarjanSCC(function)

// While the new PM CGSCCPassManager does:
for function in the reversed source order [1]
  discover a reference graph SCC
  build call graph SCCs inside the reference graph SCC
```

In the common cases, reference graph ~= call graph, the new PM order is
undesired because for `a | b | c` (3 independent functions), the new PM will
process them in the reversed order: c, b, a. If `a <-> b <-> c`, we can see
that `-print-after-all` will report the sole SCC as `scc: (c, b, a)`.

This patch corrects the iteration order. The discovered SCC order will match
the legacy PM in the common cases.

For some tests (`Transforms/Inline/cgscc-*.ll` and
`unittests/Analysis/CGSCCPassManagerTest.cpp`), the behaviors are dependent on
the SCC discovery order and there are too many check lines for the particular
order.  This patch simply reverses the function order to avoid changing too many
check lines.

Differential Revision: https://reviews.llvm.org/D90566
2020-11-02 13:22:42 -08:00

2174 lines
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//===- LazyCallGraphTest.cpp - Unit tests for the lazy CG analysis --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/ADT/Triple.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
#include <memory>
using namespace llvm;
namespace {
std::unique_ptr<Module> parseAssembly(LLVMContext &Context,
const char *Assembly) {
SMDiagnostic Error;
std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
std::string ErrMsg;
raw_string_ostream OS(ErrMsg);
Error.print("", OS);
// A failure here means that the test itself is buggy.
if (!M)
report_fatal_error(OS.str().c_str());
return M;
}
/*
IR forming a call graph with a diamond of triangle-shaped SCCs:
d1
/ \
d3--d2
/ \
b1 c1
/ \ / \
b3--b2 c3--c2
\ /
a1
/ \
a3--a2
All call edges go up between SCCs, and clockwise around the SCC.
*/
static const char DiamondOfTriangles[] =
"define void @a1() {\n"
"entry:\n"
" call void @a2()\n"
" call void @b2()\n"
" call void @c3()\n"
" ret void\n"
"}\n"
"define void @a2() {\n"
"entry:\n"
" call void @a3()\n"
" ret void\n"
"}\n"
"define void @a3() {\n"
"entry:\n"
" call void @a1()\n"
" ret void\n"
"}\n"
"define void @b1() {\n"
"entry:\n"
" call void @b2()\n"
" call void @d3()\n"
" ret void\n"
"}\n"
"define void @b2() {\n"
"entry:\n"
" call void @b3()\n"
" ret void\n"
"}\n"
"define void @b3() {\n"
"entry:\n"
" call void @b1()\n"
" ret void\n"
"}\n"
"define void @c1() {\n"
"entry:\n"
" call void @c2()\n"
" call void @d2()\n"
" ret void\n"
"}\n"
"define void @c2() {\n"
"entry:\n"
" call void @c3()\n"
" ret void\n"
"}\n"
"define void @c3() {\n"
"entry:\n"
" call void @c1()\n"
" ret void\n"
"}\n"
"define void @d1() {\n"
"entry:\n"
" call void @d2()\n"
" ret void\n"
"}\n"
"define void @d2() {\n"
"entry:\n"
" call void @d3()\n"
" ret void\n"
"}\n"
"define void @d3() {\n"
"entry:\n"
" call void @d1()\n"
" ret void\n"
"}\n";
/*
IR forming a reference graph with a diamond of triangle-shaped RefSCCs
d1
/ \
d3--d2
/ \
b1 c1
/ \ / \
b3--b2 c3--c2
\ /
a1
/ \
a3--a2
All call edges go up between RefSCCs, and clockwise around the RefSCC.
*/
static const char DiamondOfTrianglesRefGraph[] =
"define void @a1() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @a2, void ()** %a\n"
" store void ()* @b2, void ()** %a\n"
" store void ()* @c3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @a2() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @a3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @a3() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @a1, void ()** %a\n"
" ret void\n"
"}\n"
"define void @b1() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @b2, void ()** %a\n"
" store void ()* @d3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @b2() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @b3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @b3() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @b1, void ()** %a\n"
" ret void\n"
"}\n"
"define void @c1() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @c2, void ()** %a\n"
" store void ()* @d2, void ()** %a\n"
" ret void\n"
"}\n"
"define void @c2() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @c3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @c3() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @c1, void ()** %a\n"
" ret void\n"
"}\n"
"define void @d1() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @d2, void ()** %a\n"
" ret void\n"
"}\n"
"define void @d2() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @d3, void ()** %a\n"
" ret void\n"
"}\n"
"define void @d3() {\n"
"entry:\n"
" %a = alloca void ()*\n"
" store void ()* @d1, void ()** %a\n"
" ret void\n"
"}\n";
static LazyCallGraph buildCG(Module &M) {
TargetLibraryInfoImpl TLII(Triple(M.getTargetTriple()));
TargetLibraryInfo TLI(TLII);
auto GetTLI = [&TLI](Function &F) -> TargetLibraryInfo & { return TLI; };
LazyCallGraph CG(M, GetTLI);
return CG;
}
TEST(LazyCallGraphTest, BasicGraphFormation) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, DiamondOfTriangles);
LazyCallGraph CG = buildCG(*M);
// The order of the entry nodes should be stable w.r.t. the source order of
// the IR, and everything in our module is an entry node, so just directly
// build variables for each node.
auto I = CG.begin();
LazyCallGraph::Node &A1 = (I++)->getNode();
EXPECT_EQ("a1", A1.getFunction().getName());
LazyCallGraph::Node &A2 = (I++)->getNode();
EXPECT_EQ("a2", A2.getFunction().getName());
LazyCallGraph::Node &A3 = (I++)->getNode();
EXPECT_EQ("a3", A3.getFunction().getName());
LazyCallGraph::Node &B1 = (I++)->getNode();
EXPECT_EQ("b1", B1.getFunction().getName());
LazyCallGraph::Node &B2 = (I++)->getNode();
EXPECT_EQ("b2", B2.getFunction().getName());
LazyCallGraph::Node &B3 = (I++)->getNode();
EXPECT_EQ("b3", B3.getFunction().getName());
LazyCallGraph::Node &C1 = (I++)->getNode();
EXPECT_EQ("c1", C1.getFunction().getName());
LazyCallGraph::Node &C2 = (I++)->getNode();
EXPECT_EQ("c2", C2.getFunction().getName());
LazyCallGraph::Node &C3 = (I++)->getNode();
EXPECT_EQ("c3", C3.getFunction().getName());
LazyCallGraph::Node &D1 = (I++)->getNode();
EXPECT_EQ("d1", D1.getFunction().getName());
LazyCallGraph::Node &D2 = (I++)->getNode();
EXPECT_EQ("d2", D2.getFunction().getName());
LazyCallGraph::Node &D3 = (I++)->getNode();
EXPECT_EQ("d3", D3.getFunction().getName());
EXPECT_EQ(CG.end(), I);
// Build vectors and sort them for the rest of the assertions to make them
// independent of order.
std::vector<std::string> Nodes;
for (LazyCallGraph::Edge &E : A1.populate())
Nodes.push_back(std::string(E.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ("a2", Nodes[0]);
EXPECT_EQ("b2", Nodes[1]);
EXPECT_EQ("c3", Nodes[2]);
Nodes.clear();
A2.populate();
EXPECT_EQ(A2->end(), std::next(A2->begin()));
EXPECT_EQ("a3", A2->begin()->getFunction().getName());
A3.populate();
EXPECT_EQ(A3->end(), std::next(A3->begin()));
EXPECT_EQ("a1", A3->begin()->getFunction().getName());
for (LazyCallGraph::Edge &E : B1.populate())
Nodes.push_back(std::string(E.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ("b2", Nodes[0]);
EXPECT_EQ("d3", Nodes[1]);
Nodes.clear();
B2.populate();
EXPECT_EQ(B2->end(), std::next(B2->begin()));
EXPECT_EQ("b3", B2->begin()->getFunction().getName());
B3.populate();
EXPECT_EQ(B3->end(), std::next(B3->begin()));
EXPECT_EQ("b1", B3->begin()->getFunction().getName());
for (LazyCallGraph::Edge &E : C1.populate())
Nodes.push_back(std::string(E.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ("c2", Nodes[0]);
EXPECT_EQ("d2", Nodes[1]);
Nodes.clear();
C2.populate();
EXPECT_EQ(C2->end(), std::next(C2->begin()));
EXPECT_EQ("c3", C2->begin()->getFunction().getName());
C3.populate();
EXPECT_EQ(C3->end(), std::next(C3->begin()));
EXPECT_EQ("c1", C3->begin()->getFunction().getName());
D1.populate();
EXPECT_EQ(D1->end(), std::next(D1->begin()));
EXPECT_EQ("d2", D1->begin()->getFunction().getName());
D2.populate();
EXPECT_EQ(D2->end(), std::next(D2->begin()));
EXPECT_EQ("d3", D2->begin()->getFunction().getName());
D3.populate();
EXPECT_EQ(D3->end(), std::next(D3->begin()));
EXPECT_EQ("d1", D3->begin()->getFunction().getName());
// Now lets look at the RefSCCs and SCCs.
CG.buildRefSCCs();
auto J = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &D = *J++;
ASSERT_EQ(1, D.size());
for (LazyCallGraph::Node &N : *D.begin())
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("d1", Nodes[0]);
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));
EXPECT_EQ(&D, &*CG.postorder_ref_scc_begin());
LazyCallGraph::RefSCC &B = *J++;
ASSERT_EQ(1, B.size());
for (LazyCallGraph::Node &N : *B.begin())
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("b1", Nodes[0]);
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_EQ(&B, &*std::next(CG.postorder_ref_scc_begin()));
LazyCallGraph::RefSCC &C = *J++;
ASSERT_EQ(1, C.size());
for (LazyCallGraph::Node &N : *C.begin())
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("c1", Nodes[0]);
EXPECT_EQ("c2", Nodes[1]);
EXPECT_EQ("c3", Nodes[2]);
Nodes.clear();
EXPECT_FALSE(B.isAncestorOf(C));
EXPECT_FALSE(C.isAncestorOf(B));
EXPECT_TRUE(C.isParentOf(D));
EXPECT_FALSE(C.isChildOf(D));
EXPECT_TRUE(C.isAncestorOf(D));
EXPECT_FALSE(C.isDescendantOf(D));
EXPECT_EQ(&C, &*std::next(CG.postorder_ref_scc_begin(), 2));
LazyCallGraph::RefSCC &A = *J++;
ASSERT_EQ(1, A.size());
for (LazyCallGraph::Node &N : *A.begin())
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("a1", Nodes[0]);
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(&A, &*std::next(CG.postorder_ref_scc_begin(), 3));
EXPECT_EQ(CG.postorder_ref_scc_end(), J);
EXPECT_EQ(J, std::next(CG.postorder_ref_scc_begin(), 4));
}
static Function &lookupFunction(Module &M, StringRef Name) {
for (Function &F : M)
if (F.getName() == Name)
return F;
report_fatal_error("Couldn't find function!");
}
TEST(LazyCallGraphTest, BasicGraphMutation) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
LazyCallGraph::Node &A = CG.get(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = CG.get(lookupFunction(*M, "b"));
A.populate();
EXPECT_EQ(2, std::distance(A->begin(), A->end()));
B.populate();
EXPECT_EQ(0, std::distance(B->begin(), B->end()));
LazyCallGraph::Node &C = CG.get(lookupFunction(*M, "c"));
C.populate();
CG.insertEdge(B, C, LazyCallGraph::Edge::Call);
EXPECT_EQ(1, std::distance(B->begin(), B->end()));
EXPECT_EQ(0, std::distance(C->begin(), C->end()));
CG.insertEdge(C, B, LazyCallGraph::Edge::Call);
EXPECT_EQ(1, std::distance(C->begin(), C->end()));
EXPECT_EQ(&B, &C->begin()->getNode());
CG.insertEdge(C, C, LazyCallGraph::Edge::Call);
EXPECT_EQ(2, std::distance(C->begin(), C->end()));
EXPECT_EQ(&B, &C->begin()->getNode());
EXPECT_EQ(&C, &std::next(C->begin())->getNode());
CG.removeEdge(C, B);
EXPECT_EQ(1, std::distance(C->begin(), C->end()));
EXPECT_EQ(&C, &C->begin()->getNode());
CG.removeEdge(C, C);
EXPECT_EQ(0, std::distance(C->begin(), C->end()));
CG.removeEdge(B, C);
EXPECT_EQ(0, std::distance(B->begin(), B->end()));
}
TEST(LazyCallGraphTest, InnerSCCFormation) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, DiamondOfTriangles);
LazyCallGraph CG = buildCG(*M);
// Now mutate the graph to connect every node into a single RefSCC to ensure
// that our inner SCC formation handles the rest.
LazyCallGraph::Node &D1 = CG.get(lookupFunction(*M, "d1"));
LazyCallGraph::Node &A1 = CG.get(lookupFunction(*M, "a1"));
A1.populate();
D1.populate();
CG.insertEdge(D1, A1, LazyCallGraph::Edge::Ref);
// Build vectors and sort them for the rest of the assertions to make them
// independent of order.
std::vector<std::string> Nodes;
// We should build a single RefSCC for the entire graph.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
// Now walk the four SCCs which should be in post-order.
auto J = RC.begin();
LazyCallGraph::SCC &D = *J++;
for (LazyCallGraph::Node &N : D)
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("d1", Nodes[0]);
EXPECT_EQ("d2", Nodes[1]);
EXPECT_EQ("d3", Nodes[2]);
Nodes.clear();
LazyCallGraph::SCC &B = *J++;
for (LazyCallGraph::Node &N : B)
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("b1", Nodes[0]);
EXPECT_EQ("b2", Nodes[1]);
EXPECT_EQ("b3", Nodes[2]);
Nodes.clear();
LazyCallGraph::SCC &C = *J++;
for (LazyCallGraph::Node &N : C)
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("c1", Nodes[0]);
EXPECT_EQ("c2", Nodes[1]);
EXPECT_EQ("c3", Nodes[2]);
Nodes.clear();
LazyCallGraph::SCC &A = *J++;
for (LazyCallGraph::Node &N : A)
Nodes.push_back(std::string(N.getFunction().getName()));
llvm::sort(Nodes);
EXPECT_EQ(3u, Nodes.size());
EXPECT_EQ("a1", Nodes[0]);
EXPECT_EQ("a2", Nodes[1]);
EXPECT_EQ("a3", Nodes[2]);
Nodes.clear();
EXPECT_EQ(RC.end(), J);
}
TEST(LazyCallGraphTest, MultiArmSCC) {
LLVMContext Context;
// Two interlocking cycles. The really useful thing about this SCC is that it
// will require Tarjan's DFS to backtrack and finish processing all of the
// children of each node in the SCC. Since this involves call edges, both
// Tarjan implementations will have to successfully navigate the structure.
std::unique_ptr<Module> M = parseAssembly(Context, "define void @f1() {\n"
"entry:\n"
" call void @f2()\n"
" call void @f4()\n"
" ret void\n"
"}\n"
"define void @f2() {\n"
"entry:\n"
" call void @f3()\n"
" ret void\n"
"}\n"
"define void @f3() {\n"
"entry:\n"
" call void @f1()\n"
" ret void\n"
"}\n"
"define void @f4() {\n"
"entry:\n"
" call void @f5()\n"
" ret void\n"
"}\n"
"define void @f5() {\n"
"entry:\n"
" call void @f1()\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &N1 = *CG.lookup(lookupFunction(*M, "f1"));
LazyCallGraph::Node &N2 = *CG.lookup(lookupFunction(*M, "f2"));
LazyCallGraph::Node &N3 = *CG.lookup(lookupFunction(*M, "f3"));
LazyCallGraph::Node &N4 = *CG.lookup(lookupFunction(*M, "f4"));
LazyCallGraph::Node &N5 = *CG.lookup(lookupFunction(*M, "f4"));
EXPECT_EQ(&RC, CG.lookupRefSCC(N1));
EXPECT_EQ(&RC, CG.lookupRefSCC(N2));
EXPECT_EQ(&RC, CG.lookupRefSCC(N3));
EXPECT_EQ(&RC, CG.lookupRefSCC(N4));
EXPECT_EQ(&RC, CG.lookupRefSCC(N5));
ASSERT_EQ(1, RC.size());
LazyCallGraph::SCC &C = *RC.begin();
EXPECT_EQ(&C, CG.lookupSCC(N1));
EXPECT_EQ(&C, CG.lookupSCC(N2));
EXPECT_EQ(&C, CG.lookupSCC(N3));
EXPECT_EQ(&C, CG.lookupSCC(N4));
EXPECT_EQ(&C, CG.lookupSCC(N5));
}
TEST(LazyCallGraphTest, OutgoingEdgeMutation) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &BC = *CG.lookupSCC(B);
LazyCallGraph::SCC &CC = *CG.lookupSCC(C);
LazyCallGraph::SCC &DC = *CG.lookupSCC(D);
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D);
EXPECT_TRUE(ARC.isParentOf(BRC));
EXPECT_TRUE(AC.isParentOf(BC));
EXPECT_TRUE(ARC.isParentOf(CRC));
EXPECT_TRUE(AC.isParentOf(CC));
EXPECT_FALSE(ARC.isParentOf(DRC));
EXPECT_FALSE(AC.isParentOf(DC));
EXPECT_TRUE(ARC.isAncestorOf(DRC));
EXPECT_TRUE(AC.isAncestorOf(DC));
EXPECT_FALSE(DRC.isChildOf(ARC));
EXPECT_FALSE(DC.isChildOf(AC));
EXPECT_TRUE(DRC.isDescendantOf(ARC));
EXPECT_TRUE(DC.isDescendantOf(AC));
EXPECT_TRUE(DRC.isChildOf(BRC));
EXPECT_TRUE(DC.isChildOf(BC));
EXPECT_TRUE(DRC.isChildOf(CRC));
EXPECT_TRUE(DC.isChildOf(CC));
EXPECT_EQ(2, std::distance(A->begin(), A->end()));
ARC.insertOutgoingEdge(A, D, LazyCallGraph::Edge::Call);
EXPECT_EQ(3, std::distance(A->begin(), A->end()));
const LazyCallGraph::Edge &NewE = (*A)[D];
EXPECT_TRUE(NewE);
EXPECT_TRUE(NewE.isCall());
EXPECT_EQ(&D, &NewE.getNode());
// Only the parent and child tests sholud have changed. The rest of the graph
// remains the same.
EXPECT_TRUE(ARC.isParentOf(DRC));
EXPECT_TRUE(AC.isParentOf(DC));
EXPECT_TRUE(ARC.isAncestorOf(DRC));
EXPECT_TRUE(AC.isAncestorOf(DC));
EXPECT_TRUE(DRC.isChildOf(ARC));
EXPECT_TRUE(DC.isChildOf(AC));
EXPECT_TRUE(DRC.isDescendantOf(ARC));
EXPECT_TRUE(DC.isDescendantOf(AC));
EXPECT_EQ(&AC, CG.lookupSCC(A));
EXPECT_EQ(&BC, CG.lookupSCC(B));
EXPECT_EQ(&CC, CG.lookupSCC(C));
EXPECT_EQ(&DC, CG.lookupSCC(D));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C));
EXPECT_EQ(&DRC, CG.lookupRefSCC(D));
ARC.switchOutgoingEdgeToRef(A, D);
EXPECT_FALSE(NewE.isCall());
// Verify the reference graph remains the same but the SCC graph is updated.
EXPECT_TRUE(ARC.isParentOf(DRC));
EXPECT_FALSE(AC.isParentOf(DC));
EXPECT_TRUE(ARC.isAncestorOf(DRC));
EXPECT_TRUE(AC.isAncestorOf(DC));
EXPECT_TRUE(DRC.isChildOf(ARC));
EXPECT_FALSE(DC.isChildOf(AC));
EXPECT_TRUE(DRC.isDescendantOf(ARC));
EXPECT_TRUE(DC.isDescendantOf(AC));
EXPECT_EQ(&AC, CG.lookupSCC(A));
EXPECT_EQ(&BC, CG.lookupSCC(B));
EXPECT_EQ(&CC, CG.lookupSCC(C));
EXPECT_EQ(&DC, CG.lookupSCC(D));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C));
EXPECT_EQ(&DRC, CG.lookupRefSCC(D));
ARC.switchOutgoingEdgeToCall(A, D);
EXPECT_TRUE(NewE.isCall());
// Verify the reference graph remains the same but the SCC graph is updated.
EXPECT_TRUE(ARC.isParentOf(DRC));
EXPECT_TRUE(AC.isParentOf(DC));
EXPECT_TRUE(ARC.isAncestorOf(DRC));
EXPECT_TRUE(AC.isAncestorOf(DC));
EXPECT_TRUE(DRC.isChildOf(ARC));
EXPECT_TRUE(DC.isChildOf(AC));
EXPECT_TRUE(DRC.isDescendantOf(ARC));
EXPECT_TRUE(DC.isDescendantOf(AC));
EXPECT_EQ(&AC, CG.lookupSCC(A));
EXPECT_EQ(&BC, CG.lookupSCC(B));
EXPECT_EQ(&CC, CG.lookupSCC(C));
EXPECT_EQ(&DC, CG.lookupSCC(D));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C));
EXPECT_EQ(&DRC, CG.lookupRefSCC(D));
ARC.removeOutgoingEdge(A, D);
EXPECT_EQ(2, std::distance(A->begin(), A->end()));
// Now the parent and child tests fail again but the rest remains the same.
EXPECT_FALSE(ARC.isParentOf(DRC));
EXPECT_FALSE(AC.isParentOf(DC));
EXPECT_TRUE(ARC.isAncestorOf(DRC));
EXPECT_TRUE(AC.isAncestorOf(DC));
EXPECT_FALSE(DRC.isChildOf(ARC));
EXPECT_FALSE(DC.isChildOf(AC));
EXPECT_TRUE(DRC.isDescendantOf(ARC));
EXPECT_TRUE(DC.isDescendantOf(AC));
EXPECT_EQ(&AC, CG.lookupSCC(A));
EXPECT_EQ(&BC, CG.lookupSCC(B));
EXPECT_EQ(&CC, CG.lookupSCC(C));
EXPECT_EQ(&DC, CG.lookupSCC(D));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C));
EXPECT_EQ(&DRC, CG.lookupRefSCC(D));
}
TEST(LazyCallGraphTest, IncomingEdgeInsertion) {
LLVMContext Context;
// We want to ensure we can add edges even across complex diamond graphs, so
// we use the diamond of triangles graph defined above. The ascii diagram is
// repeated here for easy reference.
//
// d1 |
// / \ |
// d3--d2 |
// / \ |
// b1 c1 |
// / \ / \ |
// b3--b2 c3--c2 |
// \ / |
// a1 |
// / \ |
// a3--a2 |
//
std::unique_ptr<Module> M = parseAssembly(Context, DiamondOfTriangles);
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A1 = *CG.lookup(lookupFunction(*M, "a1"));
LazyCallGraph::Node &A2 = *CG.lookup(lookupFunction(*M, "a2"));
LazyCallGraph::Node &A3 = *CG.lookup(lookupFunction(*M, "a3"));
LazyCallGraph::Node &B1 = *CG.lookup(lookupFunction(*M, "b1"));
LazyCallGraph::Node &B2 = *CG.lookup(lookupFunction(*M, "b2"));
LazyCallGraph::Node &B3 = *CG.lookup(lookupFunction(*M, "b3"));
LazyCallGraph::Node &C1 = *CG.lookup(lookupFunction(*M, "c1"));
LazyCallGraph::Node &C2 = *CG.lookup(lookupFunction(*M, "c2"));
LazyCallGraph::Node &C3 = *CG.lookup(lookupFunction(*M, "c3"));
LazyCallGraph::Node &D1 = *CG.lookup(lookupFunction(*M, "d1"));
LazyCallGraph::Node &D2 = *CG.lookup(lookupFunction(*M, "d2"));
LazyCallGraph::Node &D3 = *CG.lookup(lookupFunction(*M, "d3"));
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A1);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B1);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C1);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D1);
ASSERT_EQ(&ARC, CG.lookupRefSCC(A2));
ASSERT_EQ(&ARC, CG.lookupRefSCC(A3));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B2));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B3));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C2));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C3));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D2));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D3));
ASSERT_EQ(1, std::distance(D2->begin(), D2->end()));
// Add an edge to make the graph:
//
// d1 |
// / \ |
// d3--d2---. |
// / \ | |
// b1 c1 | |
// / \ / \ / |
// b3--b2 c3--c2 |
// \ / |
// a1 |
// / \ |
// a3--a2 |
auto MergedRCs = CRC.insertIncomingRefEdge(D2, C2);
// Make sure we connected the nodes.
for (LazyCallGraph::Edge E : *D2) {
if (&E.getNode() == &D3)
continue;
EXPECT_EQ(&C2, &E.getNode());
}
// And marked the D ref-SCC as no longer valid.
EXPECT_EQ(1u, MergedRCs.size());
EXPECT_EQ(&DRC, MergedRCs[0]);
// Make sure we have the correct nodes in the SCC sets.
EXPECT_EQ(&ARC, CG.lookupRefSCC(A1));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A2));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A3));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B1));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B2));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B3));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C1));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C2));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C3));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D1));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D2));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D3));
// And that ancestry tests have been updated.
EXPECT_TRUE(ARC.isParentOf(CRC));
EXPECT_TRUE(BRC.isParentOf(CRC));
// And verify the post-order walk reflects the updated structure.
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
ASSERT_NE(I, E);
EXPECT_EQ(&CRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&BRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&ARC, &*I) << "Actual RefSCC: " << *I;
EXPECT_EQ(++I, E);
}
TEST(LazyCallGraphTest, IncomingEdgeInsertionRefGraph) {
LLVMContext Context;
// Another variation of the above test but with all the edges switched to
// references rather than calls.
std::unique_ptr<Module> M =
parseAssembly(Context, DiamondOfTrianglesRefGraph);
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A1 = *CG.lookup(lookupFunction(*M, "a1"));
LazyCallGraph::Node &A2 = *CG.lookup(lookupFunction(*M, "a2"));
LazyCallGraph::Node &A3 = *CG.lookup(lookupFunction(*M, "a3"));
LazyCallGraph::Node &B1 = *CG.lookup(lookupFunction(*M, "b1"));
LazyCallGraph::Node &B2 = *CG.lookup(lookupFunction(*M, "b2"));
LazyCallGraph::Node &B3 = *CG.lookup(lookupFunction(*M, "b3"));
LazyCallGraph::Node &C1 = *CG.lookup(lookupFunction(*M, "c1"));
LazyCallGraph::Node &C2 = *CG.lookup(lookupFunction(*M, "c2"));
LazyCallGraph::Node &C3 = *CG.lookup(lookupFunction(*M, "c3"));
LazyCallGraph::Node &D1 = *CG.lookup(lookupFunction(*M, "d1"));
LazyCallGraph::Node &D2 = *CG.lookup(lookupFunction(*M, "d2"));
LazyCallGraph::Node &D3 = *CG.lookup(lookupFunction(*M, "d3"));
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A1);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B1);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C1);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D1);
ASSERT_EQ(&ARC, CG.lookupRefSCC(A2));
ASSERT_EQ(&ARC, CG.lookupRefSCC(A3));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B2));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B3));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C2));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C3));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D2));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D3));
ASSERT_EQ(1, std::distance(D2->begin(), D2->end()));
// Add an edge to make the graph:
//
// d1 |
// / \ |
// d3--d2---. |
// / \ | |
// b1 c1 | |
// / \ / \ / |
// b3--b2 c3--c2 |
// \ / |
// a1 |
// / \ |
// a3--a2 |
auto MergedRCs = CRC.insertIncomingRefEdge(D2, C2);
// Make sure we connected the nodes.
for (LazyCallGraph::Edge E : *D2) {
if (&E.getNode() == &D3)
continue;
EXPECT_EQ(&C2, &E.getNode());
}
// And marked the D ref-SCC as no longer valid.
EXPECT_EQ(1u, MergedRCs.size());
EXPECT_EQ(&DRC, MergedRCs[0]);
// Make sure we have the correct nodes in the SCC sets.
EXPECT_EQ(&ARC, CG.lookupRefSCC(A1));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A2));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A3));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B1));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B2));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B3));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C1));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C2));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C3));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D1));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D2));
EXPECT_EQ(&CRC, CG.lookupRefSCC(D3));
// And that ancestry tests have been updated.
EXPECT_TRUE(ARC.isParentOf(CRC));
EXPECT_TRUE(BRC.isParentOf(CRC));
// And verify the post-order walk reflects the updated structure.
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
ASSERT_NE(I, E);
EXPECT_EQ(&CRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&BRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&ARC, &*I) << "Actual RefSCC: " << *I;
EXPECT_EQ(++I, E);
}
TEST(LazyCallGraphTest, IncomingEdgeInsertionLargeCallCycle) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &BC = *CG.lookupSCC(B);
LazyCallGraph::SCC &CC = *CG.lookupSCC(C);
LazyCallGraph::SCC &DC = *CG.lookupSCC(D);
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D);
// Connect the top to the bottom forming a large RefSCC made up mostly of calls.
auto MergedRCs = ARC.insertIncomingRefEdge(D, A);
// Make sure we connected the nodes.
EXPECT_NE(D->begin(), D->end());
EXPECT_EQ(&A, &D->begin()->getNode());
// Check that we have the dead RCs, but ignore the order.
EXPECT_EQ(3u, MergedRCs.size());
EXPECT_NE(find(MergedRCs, &BRC), MergedRCs.end());
EXPECT_NE(find(MergedRCs, &CRC), MergedRCs.end());
EXPECT_NE(find(MergedRCs, &DRC), MergedRCs.end());
// Make sure the nodes point to the right place now.
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&ARC, CG.lookupRefSCC(B));
EXPECT_EQ(&ARC, CG.lookupRefSCC(C));
EXPECT_EQ(&ARC, CG.lookupRefSCC(D));
// Check that the SCCs are in postorder.
EXPECT_EQ(4, ARC.size());
EXPECT_EQ(&DC, &ARC[0]);
EXPECT_EQ(&CC, &ARC[1]);
EXPECT_EQ(&BC, &ARC[2]);
EXPECT_EQ(&AC, &ARC[3]);
// And verify the post-order walk reflects the updated structure.
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
ASSERT_NE(I, E);
EXPECT_EQ(&ARC, &*I) << "Actual RefSCC: " << *I;
EXPECT_EQ(++I, E);
}
TEST(LazyCallGraphTest, IncomingEdgeInsertionLargeRefCycle) {
LLVMContext Context;
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" %p = alloca void ()*\n"
" store void ()* @b, void ()** %p\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" %p = alloca void ()*\n"
" store void ()* @c, void ()** %p\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" %p = alloca void ()*\n"
" store void ()* @d, void ()** %p\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D);
// Connect the top to the bottom forming a large RefSCC made up just of
// references.
auto MergedRCs = ARC.insertIncomingRefEdge(D, A);
// Make sure we connected the nodes.
EXPECT_NE(D->begin(), D->end());
EXPECT_EQ(&A, &D->begin()->getNode());
// Check that we have the dead RCs, but ignore the order.
EXPECT_EQ(3u, MergedRCs.size());
EXPECT_NE(find(MergedRCs, &BRC), MergedRCs.end());
EXPECT_NE(find(MergedRCs, &CRC), MergedRCs.end());
EXPECT_NE(find(MergedRCs, &DRC), MergedRCs.end());
// Make sure the nodes point to the right place now.
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(&ARC, CG.lookupRefSCC(B));
EXPECT_EQ(&ARC, CG.lookupRefSCC(C));
EXPECT_EQ(&ARC, CG.lookupRefSCC(D));
// And verify the post-order walk reflects the updated structure.
auto I = CG.postorder_ref_scc_begin(), End = CG.postorder_ref_scc_end();
ASSERT_NE(I, End);
EXPECT_EQ(&ARC, &*I) << "Actual RefSCC: " << *I;
EXPECT_EQ(++I, End);
}
TEST(LazyCallGraphTest, InlineAndDeleteFunction) {
LLVMContext Context;
// We want to ensure we can delete nodes from relatively complex graphs and
// so use the diamond of triangles graph defined above.
//
// The ascii diagram is repeated here for easy reference.
//
// d1 |
// / \ |
// d3--d2 |
// / \ |
// b1 c1 |
// / \ / \ |
// b3--b2 c3--c2 |
// \ / |
// a1 |
// / \ |
// a3--a2 |
//
std::unique_ptr<Module> M = parseAssembly(Context, DiamondOfTriangles);
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
for (LazyCallGraph::RefSCC &RC : CG.postorder_ref_sccs())
dbgs() << "Formed RefSCC: " << RC << "\n";
LazyCallGraph::Node &A1 = *CG.lookup(lookupFunction(*M, "a1"));
LazyCallGraph::Node &A2 = *CG.lookup(lookupFunction(*M, "a2"));
LazyCallGraph::Node &A3 = *CG.lookup(lookupFunction(*M, "a3"));
LazyCallGraph::Node &B1 = *CG.lookup(lookupFunction(*M, "b1"));
LazyCallGraph::Node &B2 = *CG.lookup(lookupFunction(*M, "b2"));
LazyCallGraph::Node &B3 = *CG.lookup(lookupFunction(*M, "b3"));
LazyCallGraph::Node &C1 = *CG.lookup(lookupFunction(*M, "c1"));
LazyCallGraph::Node &C2 = *CG.lookup(lookupFunction(*M, "c2"));
LazyCallGraph::Node &C3 = *CG.lookup(lookupFunction(*M, "c3"));
LazyCallGraph::Node &D1 = *CG.lookup(lookupFunction(*M, "d1"));
LazyCallGraph::Node &D2 = *CG.lookup(lookupFunction(*M, "d2"));
LazyCallGraph::Node &D3 = *CG.lookup(lookupFunction(*M, "d3"));
LazyCallGraph::RefSCC &ARC = *CG.lookupRefSCC(A1);
LazyCallGraph::RefSCC &BRC = *CG.lookupRefSCC(B1);
LazyCallGraph::RefSCC &CRC = *CG.lookupRefSCC(C1);
LazyCallGraph::RefSCC &DRC = *CG.lookupRefSCC(D1);
ASSERT_EQ(&ARC, CG.lookupRefSCC(A2));
ASSERT_EQ(&ARC, CG.lookupRefSCC(A3));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B2));
ASSERT_EQ(&BRC, CG.lookupRefSCC(B3));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C2));
ASSERT_EQ(&CRC, CG.lookupRefSCC(C3));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D2));
ASSERT_EQ(&DRC, CG.lookupRefSCC(D3));
ASSERT_EQ(1, std::distance(D2->begin(), D2->end()));
// Delete d2 from the graph, as if it had been inlined.
//
// d1 |
// / / |
// d3--. |
// / \ |
// b1 c1 |
// / \ / \ |
// b3--b2 c3--c2 |
// \ / |
// a1 |
// / \ |
// a3--a2 |
Function &D2F = D2.getFunction();
CallInst *C1Call = nullptr, *D1Call = nullptr;
for (User *U : D2F.users()) {
CallInst *CI = dyn_cast<CallInst>(U);
ASSERT_TRUE(CI) << "Expected a call: " << *U;
if (CI->getParent()->getParent() == &C1.getFunction()) {
ASSERT_EQ(nullptr, C1Call) << "Found too many C1 calls: " << *CI;
C1Call = CI;
} else if (CI->getParent()->getParent() == &D1.getFunction()) {
ASSERT_EQ(nullptr, D1Call) << "Found too many D1 calls: " << *CI;
D1Call = CI;
} else {
FAIL() << "Found an unexpected call instruction: " << *CI;
}
}
ASSERT_NE(C1Call, nullptr);
ASSERT_NE(D1Call, nullptr);
ASSERT_EQ(&D2F, C1Call->getCalledFunction());
ASSERT_EQ(&D2F, D1Call->getCalledFunction());
C1Call->setCalledFunction(&D3.getFunction());
D1Call->setCalledFunction(&D3.getFunction());
ASSERT_EQ(0u, D2F.getNumUses());
// Insert new edges first.
CRC.insertTrivialCallEdge(C1, D3);
DRC.insertTrivialCallEdge(D1, D3);
// Then remove the old ones.
LazyCallGraph::SCC &DC = *CG.lookupSCC(D2);
auto NewCs = DRC.switchInternalEdgeToRef(D1, D2);
EXPECT_EQ(&DC, CG.lookupSCC(D2));
EXPECT_EQ(NewCs.end(), std::next(NewCs.begin()));
LazyCallGraph::SCC &NewDC = *NewCs.begin();
EXPECT_EQ(&NewDC, CG.lookupSCC(D1));
EXPECT_EQ(&NewDC, CG.lookupSCC(D3));
auto NewRCs = DRC.removeInternalRefEdge(D1, {&D2});
ASSERT_EQ(2u, NewRCs.size());
LazyCallGraph::RefSCC &NewDRC = *NewRCs[0];
EXPECT_EQ(&NewDRC, CG.lookupRefSCC(D1));
EXPECT_EQ(&NewDRC, CG.lookupRefSCC(D3));
LazyCallGraph::RefSCC &D2RC = *NewRCs[1];
EXPECT_EQ(&D2RC, CG.lookupRefSCC(D2));
EXPECT_FALSE(NewDRC.isParentOf(D2RC));
EXPECT_TRUE(CRC.isParentOf(D2RC));
EXPECT_TRUE(CRC.isParentOf(NewDRC));
EXPECT_TRUE(D2RC.isParentOf(NewDRC));
CRC.removeOutgoingEdge(C1, D2);
EXPECT_FALSE(CRC.isParentOf(D2RC));
EXPECT_TRUE(CRC.isParentOf(NewDRC));
EXPECT_TRUE(D2RC.isParentOf(NewDRC));
// Now that we've updated the call graph, D2 is dead, so remove it.
CG.removeDeadFunction(D2F);
// Check that the graph still looks the same.
EXPECT_EQ(&ARC, CG.lookupRefSCC(A1));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A2));
EXPECT_EQ(&ARC, CG.lookupRefSCC(A3));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B1));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B2));
EXPECT_EQ(&BRC, CG.lookupRefSCC(B3));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C1));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C2));
EXPECT_EQ(&CRC, CG.lookupRefSCC(C3));
EXPECT_EQ(&NewDRC, CG.lookupRefSCC(D1));
EXPECT_EQ(&NewDRC, CG.lookupRefSCC(D3));
EXPECT_TRUE(CRC.isParentOf(NewDRC));
// Verify the post-order walk hasn't changed.
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
ASSERT_NE(I, E);
EXPECT_EQ(&NewDRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&BRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&CRC, &*I) << "Actual RefSCC: " << *I;
ASSERT_NE(++I, E);
EXPECT_EQ(&ARC, &*I) << "Actual RefSCC: " << *I;
EXPECT_EQ(++I, E);
}
TEST(LazyCallGraphTest, InternalEdgeMutation) {
LLVMContext Context;
std::unique_ptr<Module> M = parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" call void @a()\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
EXPECT_EQ(1, RC.size());
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(A));
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(B));
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(C));
// Insert an edge from 'a' to 'c'. Nothing changes about the graph.
RC.insertInternalRefEdge(A, C);
EXPECT_EQ(2, std::distance(A->begin(), A->end()));
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
EXPECT_EQ(1, RC.size());
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(A));
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(B));
EXPECT_EQ(&*RC.begin(), CG.lookupSCC(C));
// Switch the call edge from 'b' to 'c' to a ref edge. This will break the
// call cycle and cause us to form more SCCs. The RefSCC will remain the same
// though.
auto NewCs = RC.switchInternalEdgeToRef(B, C);
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
auto J = RC.begin();
// The SCCs must be in *post-order* which means successors before
// predecessors. At this point we have call edges from C to A and from A to
// B. The only valid postorder is B, A, C.
EXPECT_EQ(&*J++, CG.lookupSCC(B));
EXPECT_EQ(&*J++, CG.lookupSCC(A));
EXPECT_EQ(&*J++, CG.lookupSCC(C));
EXPECT_EQ(RC.end(), J);
// And the returned range must be the slice of this sequence containing new
// SCCs.
EXPECT_EQ(RC.begin(), NewCs.begin());
EXPECT_EQ(std::prev(RC.end()), NewCs.end());
// Test turning the ref edge from A to C into a call edge. This will form an
// SCC out of A and C. Since we previously had a call edge from C to A, the
// C SCC should be preserved and have A merged into it while the A SCC should
// be invalidated.
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &CC = *CG.lookupSCC(C);
EXPECT_TRUE(RC.switchInternalEdgeToCall(A, C, [&](ArrayRef<LazyCallGraph::SCC *> MergedCs) {
ASSERT_EQ(1u, MergedCs.size());
EXPECT_EQ(&AC, MergedCs[0]);
}));
EXPECT_EQ(2, CC.size());
EXPECT_EQ(&CC, CG.lookupSCC(A));
EXPECT_EQ(&CC, CG.lookupSCC(C));
J = RC.begin();
EXPECT_EQ(&*J++, CG.lookupSCC(B));
EXPECT_EQ(&*J++, CG.lookupSCC(C));
EXPECT_EQ(RC.end(), J);
}
TEST(LazyCallGraphTest, InternalEdgeRemoval) {
LLVMContext Context;
// A nice fully connected (including self-edges) RefSCC.
std::unique_ptr<Module> M = parseAssembly(
Context, "define void @a(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @b(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @c(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
LazyCallGraph::RefSCC &RC = *I;
EXPECT_EQ(E, std::next(I));
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
// Remove the edge from b -> a, which should leave the 3 functions still in
// a single connected component because of a -> b -> c -> a.
SmallVector<LazyCallGraph::RefSCC *, 1> NewRCs =
RC.removeInternalRefEdge(B, {&A});
EXPECT_EQ(0u, NewRCs.size());
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
auto J = CG.postorder_ref_scc_begin();
EXPECT_EQ(I, J);
EXPECT_EQ(&RC, &*J);
EXPECT_EQ(E, std::next(J));
// Increment I before we actually mutate the structure so that it remains
// a valid iterator.
++I;
// Remove the edge from c -> a, which should leave 'a' in the original RefSCC
// and form a new RefSCC for 'b' and 'c'.
NewRCs = RC.removeInternalRefEdge(C, {&A});
ASSERT_EQ(2u, NewRCs.size());
LazyCallGraph::RefSCC &BCRC = *NewRCs[0];
LazyCallGraph::RefSCC &ARC = *NewRCs[1];
EXPECT_EQ(&ARC, CG.lookupRefSCC(A));
EXPECT_EQ(1, std::distance(ARC.begin(), ARC.end()));
EXPECT_EQ(&BCRC, CG.lookupRefSCC(B));
EXPECT_EQ(&BCRC, CG.lookupRefSCC(C));
J = CG.postorder_ref_scc_begin();
EXPECT_NE(I, J);
EXPECT_EQ(&BCRC, &*J);
++J;
EXPECT_NE(I, J);
EXPECT_EQ(&ARC, &*J);
++J;
EXPECT_EQ(I, J);
EXPECT_EQ(E, J);
}
TEST(LazyCallGraphTest, InternalMultiEdgeRemoval) {
LLVMContext Context;
// A nice fully connected (including self-edges) RefSCC.
std::unique_ptr<Module> M = parseAssembly(
Context, "define void @a(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @b(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @c(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
LazyCallGraph::RefSCC &RC = *I;
EXPECT_EQ(E, std::next(I));
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
EXPECT_EQ(&RC, CG.lookupRefSCC(A));
EXPECT_EQ(&RC, CG.lookupRefSCC(B));
EXPECT_EQ(&RC, CG.lookupRefSCC(C));
// Increment I before we actually mutate the structure so that it remains
// a valid iterator.
++I;
// Remove the edges from b -> a and b -> c, leaving b in its own RefSCC.
SmallVector<LazyCallGraph::RefSCC *, 1> NewRCs =
RC.removeInternalRefEdge(B, {&A, &C});
ASSERT_EQ(2u, NewRCs.size());
LazyCallGraph::RefSCC &BRC = *NewRCs[0];
LazyCallGraph::RefSCC &ACRC = *NewRCs[1];
EXPECT_EQ(&BRC, CG.lookupRefSCC(B));
EXPECT_EQ(1, std::distance(BRC.begin(), BRC.end()));
EXPECT_EQ(&ACRC, CG.lookupRefSCC(A));
EXPECT_EQ(&ACRC, CG.lookupRefSCC(C));
auto J = CG.postorder_ref_scc_begin();
EXPECT_NE(I, J);
EXPECT_EQ(&BRC, &*J);
++J;
EXPECT_NE(I, J);
EXPECT_EQ(&ACRC, &*J);
++J;
EXPECT_EQ(I, J);
EXPECT_EQ(E, J);
}
TEST(LazyCallGraphTest, InternalNoOpEdgeRemoval) {
LLVMContext Context;
// A graph with a single cycle formed both from call and reference edges
// which makes the reference edges trivial to delete. The graph looks like:
//
// Reference edges: a -> b -> c -> a
// Call edges: a -> c -> b -> a
std::unique_ptr<Module> M = parseAssembly(
Context, "define void @a(i8** %ptr) {\n"
"entry:\n"
" call void @b(i8** %ptr)\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @b(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @a to i8*), i8** %ptr\n"
" call void @c(i8** %ptr)\n"
" ret void\n"
"}\n"
"define void @c(i8** %ptr) {\n"
"entry:\n"
" call void @a(i8** %ptr)\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin(), E = CG.postorder_ref_scc_end();
LazyCallGraph::RefSCC &RC = *I;
EXPECT_EQ(E, std::next(I));
LazyCallGraph::SCC &C = *RC.begin();
EXPECT_EQ(RC.end(), std::next(RC.begin()));
LazyCallGraph::Node &AN = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &BN = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &CN = *CG.lookup(lookupFunction(*M, "c"));
EXPECT_EQ(&RC, CG.lookupRefSCC(AN));
EXPECT_EQ(&RC, CG.lookupRefSCC(BN));
EXPECT_EQ(&RC, CG.lookupRefSCC(CN));
EXPECT_EQ(&C, CG.lookupSCC(AN));
EXPECT_EQ(&C, CG.lookupSCC(BN));
EXPECT_EQ(&C, CG.lookupSCC(CN));
// Remove the edge from a -> c which doesn't change anything.
SmallVector<LazyCallGraph::RefSCC *, 1> NewRCs =
RC.removeInternalRefEdge(AN, {&CN});
EXPECT_EQ(0u, NewRCs.size());
EXPECT_EQ(&RC, CG.lookupRefSCC(AN));
EXPECT_EQ(&RC, CG.lookupRefSCC(BN));
EXPECT_EQ(&RC, CG.lookupRefSCC(CN));
EXPECT_EQ(&C, CG.lookupSCC(AN));
EXPECT_EQ(&C, CG.lookupSCC(BN));
EXPECT_EQ(&C, CG.lookupSCC(CN));
auto J = CG.postorder_ref_scc_begin();
EXPECT_EQ(I, J);
EXPECT_EQ(&RC, &*J);
EXPECT_EQ(E, std::next(J));
// Remove the edge from b -> a and c -> b; again this doesn't change
// anything.
NewRCs = RC.removeInternalRefEdge(BN, {&AN});
NewRCs = RC.removeInternalRefEdge(CN, {&BN});
EXPECT_EQ(0u, NewRCs.size());
EXPECT_EQ(&RC, CG.lookupRefSCC(AN));
EXPECT_EQ(&RC, CG.lookupRefSCC(BN));
EXPECT_EQ(&RC, CG.lookupRefSCC(CN));
EXPECT_EQ(&C, CG.lookupSCC(AN));
EXPECT_EQ(&C, CG.lookupSCC(BN));
EXPECT_EQ(&C, CG.lookupSCC(CN));
J = CG.postorder_ref_scc_begin();
EXPECT_EQ(I, J);
EXPECT_EQ(&RC, &*J);
EXPECT_EQ(E, std::next(J));
}
TEST(LazyCallGraphTest, InternalCallEdgeToRef) {
LLVMContext Context;
// A nice fully connected (including self-edges) SCC (and RefSCC)
std::unique_ptr<Module> M = parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @a()\n"
" call void @b()\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" call void @a()\n"
" call void @b()\n"
" call void @c()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" call void @a()\n"
" call void @b()\n"
" call void @c()\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
EXPECT_EQ(1, RC.size());
LazyCallGraph::SCC &AC = *RC.begin();
LazyCallGraph::Node &AN = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &BN = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &CN = *CG.lookup(lookupFunction(*M, "c"));
EXPECT_EQ(&AC, CG.lookupSCC(AN));
EXPECT_EQ(&AC, CG.lookupSCC(BN));
EXPECT_EQ(&AC, CG.lookupSCC(CN));
// Remove the call edge from b -> a to a ref edge, which should leave the
// 3 functions still in a single connected component because of a -> b ->
// c -> a.
auto NewCs = RC.switchInternalEdgeToRef(BN, AN);
EXPECT_EQ(NewCs.begin(), NewCs.end());
EXPECT_EQ(1, RC.size());
EXPECT_EQ(&AC, CG.lookupSCC(AN));
EXPECT_EQ(&AC, CG.lookupSCC(BN));
EXPECT_EQ(&AC, CG.lookupSCC(CN));
// Remove the edge from c -> a, which should leave 'a' in the original SCC
// and form a new SCC for 'b' and 'c'.
NewCs = RC.switchInternalEdgeToRef(CN, AN);
EXPECT_EQ(1, std::distance(NewCs.begin(), NewCs.end()));
EXPECT_EQ(2, RC.size());
EXPECT_EQ(&AC, CG.lookupSCC(AN));
LazyCallGraph::SCC &BC = *CG.lookupSCC(BN);
EXPECT_NE(&BC, &AC);
EXPECT_EQ(&BC, CG.lookupSCC(CN));
auto J = RC.find(AC);
EXPECT_EQ(&AC, &*J);
--J;
EXPECT_EQ(&BC, &*J);
EXPECT_EQ(RC.begin(), J);
EXPECT_EQ(J, NewCs.begin());
// Remove the edge from c -> b, which should leave 'b' in the original SCC
// and form a new SCC for 'c'. It shouldn't change 'a's SCC.
NewCs = RC.switchInternalEdgeToRef(CN, BN);
EXPECT_EQ(1, std::distance(NewCs.begin(), NewCs.end()));
EXPECT_EQ(3, RC.size());
EXPECT_EQ(&AC, CG.lookupSCC(AN));
EXPECT_EQ(&BC, CG.lookupSCC(BN));
LazyCallGraph::SCC &CC = *CG.lookupSCC(CN);
EXPECT_NE(&CC, &AC);
EXPECT_NE(&CC, &BC);
J = RC.find(AC);
EXPECT_EQ(&AC, &*J);
--J;
EXPECT_EQ(&BC, &*J);
--J;
EXPECT_EQ(&CC, &*J);
EXPECT_EQ(RC.begin(), J);
EXPECT_EQ(J, NewCs.begin());
}
TEST(LazyCallGraphTest, InternalRefEdgeToCall) {
LLVMContext Context;
// Basic tests for making a ref edge a call. This hits the basics of the
// process only.
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" call void @c()\n"
" store void()* @d, void()** undef\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" store void()* @c, void()** undef\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" store void()* @b, void()** undef\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" store void()* @a, void()** undef\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &BC = *CG.lookupSCC(B);
LazyCallGraph::SCC &CC = *CG.lookupSCC(C);
LazyCallGraph::SCC &DC = *CG.lookupSCC(D);
// Check the initial post-order. Note that B and C could be flipped here (and
// in our mutation) without changing the nature of this test.
ASSERT_EQ(4, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&BC, &RC[1]);
EXPECT_EQ(&CC, &RC[2]);
EXPECT_EQ(&AC, &RC[3]);
// Switch the ref edge from A -> D to a call edge. This should have no
// effect as it is already in postorder and no new cycles are formed.
EXPECT_FALSE(RC.switchInternalEdgeToCall(A, D));
ASSERT_EQ(4, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&BC, &RC[1]);
EXPECT_EQ(&CC, &RC[2]);
EXPECT_EQ(&AC, &RC[3]);
// Switch B -> C to a call edge. This doesn't form any new cycles but does
// require reordering the SCCs.
EXPECT_FALSE(RC.switchInternalEdgeToCall(B, C));
ASSERT_EQ(4, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&CC, &RC[1]);
EXPECT_EQ(&BC, &RC[2]);
EXPECT_EQ(&AC, &RC[3]);
// Switch C -> B to a call edge. This forms a cycle and forces merging SCCs.
EXPECT_TRUE(RC.switchInternalEdgeToCall(C, B, [&](ArrayRef<LazyCallGraph::SCC *> MergedCs) {
ASSERT_EQ(1u, MergedCs.size());
EXPECT_EQ(&CC, MergedCs[0]);
}));
ASSERT_EQ(3, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&BC, &RC[1]);
EXPECT_EQ(&AC, &RC[2]);
EXPECT_EQ(2, BC.size());
EXPECT_EQ(&BC, CG.lookupSCC(B));
EXPECT_EQ(&BC, CG.lookupSCC(C));
}
TEST(LazyCallGraphTest, InternalRefEdgeToCallNoCycleInterleaved) {
LLVMContext Context;
// Test for having a post-order prior to changing a ref edge to a call edge
// with SCCs connecting to the source and connecting to the target, but not
// connecting to both, interleaved between the source and target. This
// ensures we correctly partition the range rather than simply moving one or
// the other.
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b1()\n"
" call void @c1()\n"
" ret void\n"
"}\n"
"define void @b1() {\n"
"entry:\n"
" call void @c1()\n"
" call void @b2()\n"
" ret void\n"
"}\n"
"define void @c1() {\n"
"entry:\n"
" call void @b2()\n"
" call void @c2()\n"
" ret void\n"
"}\n"
"define void @b2() {\n"
"entry:\n"
" call void @c2()\n"
" call void @b3()\n"
" ret void\n"
"}\n"
"define void @c2() {\n"
"entry:\n"
" call void @b3()\n"
" call void @c3()\n"
" ret void\n"
"}\n"
"define void @b3() {\n"
"entry:\n"
" call void @c3()\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @c3() {\n"
"entry:\n"
" store void()* @b1, void()** undef\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" store void()* @a, void()** undef\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B1 = *CG.lookup(lookupFunction(*M, "b1"));
LazyCallGraph::Node &B2 = *CG.lookup(lookupFunction(*M, "b2"));
LazyCallGraph::Node &B3 = *CG.lookup(lookupFunction(*M, "b3"));
LazyCallGraph::Node &C1 = *CG.lookup(lookupFunction(*M, "c1"));
LazyCallGraph::Node &C2 = *CG.lookup(lookupFunction(*M, "c2"));
LazyCallGraph::Node &C3 = *CG.lookup(lookupFunction(*M, "c3"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &B1C = *CG.lookupSCC(B1);
LazyCallGraph::SCC &B2C = *CG.lookupSCC(B2);
LazyCallGraph::SCC &B3C = *CG.lookupSCC(B3);
LazyCallGraph::SCC &C1C = *CG.lookupSCC(C1);
LazyCallGraph::SCC &C2C = *CG.lookupSCC(C2);
LazyCallGraph::SCC &C3C = *CG.lookupSCC(C3);
LazyCallGraph::SCC &DC = *CG.lookupSCC(D);
// Several call edges are initially present to force a particual post-order.
// Remove them now, leaving an interleaved post-order pattern.
RC.switchTrivialInternalEdgeToRef(B3, C3);
RC.switchTrivialInternalEdgeToRef(C2, B3);
RC.switchTrivialInternalEdgeToRef(B2, C2);
RC.switchTrivialInternalEdgeToRef(C1, B2);
RC.switchTrivialInternalEdgeToRef(B1, C1);
// Check the initial post-order. We ensure this order with the extra edges
// that are nuked above.
ASSERT_EQ(8, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&C3C, &RC[1]);
EXPECT_EQ(&B3C, &RC[2]);
EXPECT_EQ(&C2C, &RC[3]);
EXPECT_EQ(&B2C, &RC[4]);
EXPECT_EQ(&C1C, &RC[5]);
EXPECT_EQ(&B1C, &RC[6]);
EXPECT_EQ(&AC, &RC[7]);
// Switch C3 -> B1 to a call edge. This doesn't form any new cycles but does
// require reordering the SCCs in the face of tricky internal node
// structures.
EXPECT_FALSE(RC.switchInternalEdgeToCall(C3, B1));
ASSERT_EQ(8, RC.size());
EXPECT_EQ(&DC, &RC[0]);
EXPECT_EQ(&B3C, &RC[1]);
EXPECT_EQ(&B2C, &RC[2]);
EXPECT_EQ(&B1C, &RC[3]);
EXPECT_EQ(&C3C, &RC[4]);
EXPECT_EQ(&C2C, &RC[5]);
EXPECT_EQ(&C1C, &RC[6]);
EXPECT_EQ(&AC, &RC[7]);
}
TEST(LazyCallGraphTest, InternalRefEdgeToCallBothPartitionAndMerge) {
LLVMContext Context;
// Test for having a postorder where between the source and target are all
// three kinds of other SCCs:
// 1) One connected to the target only that have to be shifted below the
// source.
// 2) One connected to the source only that have to be shifted below the
// target.
// 3) One connected to both source and target that has to remain and get
// merged away.
//
// To achieve this we construct a heavily connected graph to force
// a particular post-order. Then we remove the forcing edges and connect
// a cycle.
//
// Diagram for the graph we want on the left and the graph we use to force
// the ordering on the right. Edges ponit down or right.
//
// A | A |
// / \ | / \ |
// B E | B \ |
// |\ | | |\ | |
// | D | | C-D-E |
// | \| | | \| |
// C F | \ F |
// \ / | \ / |
// G | G |
//
// And we form a cycle by connecting F to B.
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @a() {\n"
"entry:\n"
" call void @b()\n"
" call void @e()\n"
" ret void\n"
"}\n"
"define void @b() {\n"
"entry:\n"
" call void @c()\n"
" call void @d()\n"
" ret void\n"
"}\n"
"define void @c() {\n"
"entry:\n"
" call void @d()\n"
" call void @g()\n"
" ret void\n"
"}\n"
"define void @d() {\n"
"entry:\n"
" call void @e()\n"
" call void @f()\n"
" ret void\n"
"}\n"
"define void @e() {\n"
"entry:\n"
" call void @f()\n"
" ret void\n"
"}\n"
"define void @f() {\n"
"entry:\n"
" store void()* @b, void()** undef\n"
" call void @g()\n"
" ret void\n"
"}\n"
"define void @g() {\n"
"entry:\n"
" store void()* @a, void()** undef\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &A = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &B = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &C = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &D = *CG.lookup(lookupFunction(*M, "d"));
LazyCallGraph::Node &E = *CG.lookup(lookupFunction(*M, "e"));
LazyCallGraph::Node &F = *CG.lookup(lookupFunction(*M, "f"));
LazyCallGraph::Node &G = *CG.lookup(lookupFunction(*M, "g"));
LazyCallGraph::SCC &AC = *CG.lookupSCC(A);
LazyCallGraph::SCC &BC = *CG.lookupSCC(B);
LazyCallGraph::SCC &CC = *CG.lookupSCC(C);
LazyCallGraph::SCC &DC = *CG.lookupSCC(D);
LazyCallGraph::SCC &EC = *CG.lookupSCC(E);
LazyCallGraph::SCC &FC = *CG.lookupSCC(F);
LazyCallGraph::SCC &GC = *CG.lookupSCC(G);
// Remove the extra edges that were used to force a particular post-order.
RC.switchTrivialInternalEdgeToRef(C, D);
RC.switchTrivialInternalEdgeToRef(D, E);
// Check the initial post-order. We ensure this order with the extra edges
// that are nuked above.
ASSERT_EQ(7, RC.size());
EXPECT_EQ(&GC, &RC[0]);
EXPECT_EQ(&FC, &RC[1]);
EXPECT_EQ(&EC, &RC[2]);
EXPECT_EQ(&DC, &RC[3]);
EXPECT_EQ(&CC, &RC[4]);
EXPECT_EQ(&BC, &RC[5]);
EXPECT_EQ(&AC, &RC[6]);
// Switch F -> B to a call edge. This merges B, D, and F into a single SCC,
// and has to place the C and E SCCs on either side of it:
// A A |
// / \ / \ |
// B E | E |
// |\ | \ / |
// | D | -> B |
// | \| / \ |
// C F C | |
// \ / \ / |
// G G |
EXPECT_TRUE(RC.switchInternalEdgeToCall(
F, B, [&](ArrayRef<LazyCallGraph::SCC *> MergedCs) {
ASSERT_EQ(2u, MergedCs.size());
EXPECT_EQ(&FC, MergedCs[0]);
EXPECT_EQ(&DC, MergedCs[1]);
}));
EXPECT_EQ(3, BC.size());
// And make sure the postorder was updated.
ASSERT_EQ(5, RC.size());
EXPECT_EQ(&GC, &RC[0]);
EXPECT_EQ(&CC, &RC[1]);
EXPECT_EQ(&BC, &RC[2]);
EXPECT_EQ(&EC, &RC[3]);
EXPECT_EQ(&AC, &RC[4]);
}
// Test for IR containing constants using blockaddress constant expressions.
// These are truly unique constructs: constant expressions with non-constant
// operands.
TEST(LazyCallGraphTest, HandleBlockAddress) {
LLVMContext Context;
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @f() {\n"
"entry:\n"
" ret void\n"
"bb:\n"
" unreachable\n"
"}\n"
"define void @g(i8** %ptr) {\n"
"entry:\n"
" store i8* blockaddress(@f, %bb), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &FRC = *I++;
LazyCallGraph::RefSCC &GRC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &F = *CG.lookup(lookupFunction(*M, "f"));
LazyCallGraph::Node &G = *CG.lookup(lookupFunction(*M, "g"));
EXPECT_EQ(&FRC, CG.lookupRefSCC(F));
EXPECT_EQ(&GRC, CG.lookupRefSCC(G));
EXPECT_TRUE(GRC.isParentOf(FRC));
}
// Test that a blockaddress that refers to itself creates no new RefSCC
// connections. https://bugs.llvm.org/show_bug.cgi?id=40722
TEST(LazyCallGraphTest, HandleBlockAddress2) {
LLVMContext Context;
std::unique_ptr<Module> M =
parseAssembly(Context, "define void @f() {\n"
" ret void\n"
"}\n"
"define void @g(i8** %ptr) {\n"
"bb:\n"
" store i8* blockaddress(@g, %bb), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &FRC = *I++;
LazyCallGraph::RefSCC &GRC = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
LazyCallGraph::Node &F = *CG.lookup(lookupFunction(*M, "f"));
LazyCallGraph::Node &G = *CG.lookup(lookupFunction(*M, "g"));
EXPECT_EQ(&FRC, CG.lookupRefSCC(F));
EXPECT_EQ(&GRC, CG.lookupRefSCC(G));
EXPECT_FALSE(GRC.isParentOf(FRC));
EXPECT_FALSE(FRC.isParentOf(GRC));
}
TEST(LazyCallGraphTest, ReplaceNodeFunction) {
LLVMContext Context;
// A graph with several different kinds of edges pointing at a particular
// function.
std::unique_ptr<Module> M =
parseAssembly(Context,
"define void @a(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @b(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" call void @d(i8** %ptr)"
" ret void\n"
"}\n"
"define void @c(i8** %ptr) {\n"
"entry:\n"
" call void @d(i8** %ptr)"
" call void @d(i8** %ptr)"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @d(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" call void @c(i8** %ptr)"
" call void @d(i8** %ptr)"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &RC1 = *I++;
LazyCallGraph::RefSCC &RC2 = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
ASSERT_EQ(2, RC1.size());
LazyCallGraph::SCC &C1 = RC1[0];
LazyCallGraph::SCC &C2 = RC1[1];
LazyCallGraph::Node &AN = *CG.lookup(lookupFunction(*M, "a"));
LazyCallGraph::Node &BN = *CG.lookup(lookupFunction(*M, "b"));
LazyCallGraph::Node &CN = *CG.lookup(lookupFunction(*M, "c"));
LazyCallGraph::Node &DN = *CG.lookup(lookupFunction(*M, "d"));
EXPECT_EQ(&C1, CG.lookupSCC(DN));
EXPECT_EQ(&C1, CG.lookupSCC(CN));
EXPECT_EQ(&C2, CG.lookupSCC(BN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(DN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(CN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(BN));
EXPECT_EQ(&RC2, CG.lookupRefSCC(AN));
// Now we need to build a new function 'e' with the same signature as 'd'.
Function &D = DN.getFunction();
Function &E = *Function::Create(D.getFunctionType(), D.getLinkage(), "e");
D.getParent()->getFunctionList().insert(D.getIterator(), &E);
// Change each use of 'd' to use 'e'. This is particularly easy as they have
// the same type.
D.replaceAllUsesWith(&E);
// Splice the body of the old function into the new one.
E.getBasicBlockList().splice(E.begin(), D.getBasicBlockList());
// And fix up the one argument.
D.arg_begin()->replaceAllUsesWith(&*E.arg_begin());
E.arg_begin()->takeName(&*D.arg_begin());
// Now replace the function in the graph.
RC1.replaceNodeFunction(DN, E);
EXPECT_EQ(&E, &DN.getFunction());
EXPECT_EQ(&DN, &(*CN)[DN].getNode());
EXPECT_EQ(&DN, &(*BN)[DN].getNode());
}
TEST(LazyCallGraphTest, RemoveFunctionWithSpurriousRef) {
LLVMContext Context;
// A graph with a couple of RefSCCs.
std::unique_ptr<Module> M =
parseAssembly(Context,
"define void @a(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @d to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @b(i8** %ptr) {\n"
"entry:\n"
" store i8* bitcast (void(i8**)* @c to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @c(i8** %ptr) {\n"
"entry:\n"
" call void @d(i8** %ptr)"
" ret void\n"
"}\n"
"define void @d(i8** %ptr) {\n"
"entry:\n"
" call void @c(i8** %ptr)"
" store i8* bitcast (void(i8**)* @b to i8*), i8** %ptr\n"
" ret void\n"
"}\n"
"define void @dead() {\n"
"entry:\n"
" ret void\n"
"}\n");
LazyCallGraph CG = buildCG(*M);
// Insert spurious ref edges.
LazyCallGraph::Node &AN = CG.get(lookupFunction(*M, "a"));
LazyCallGraph::Node &BN = CG.get(lookupFunction(*M, "b"));
LazyCallGraph::Node &CN = CG.get(lookupFunction(*M, "c"));
LazyCallGraph::Node &DN = CG.get(lookupFunction(*M, "d"));
LazyCallGraph::Node &DeadN = CG.get(lookupFunction(*M, "dead"));
AN.populate();
BN.populate();
CN.populate();
DN.populate();
DeadN.populate();
CG.insertEdge(AN, DeadN, LazyCallGraph::Edge::Ref);
CG.insertEdge(BN, DeadN, LazyCallGraph::Edge::Ref);
CG.insertEdge(CN, DeadN, LazyCallGraph::Edge::Ref);
CG.insertEdge(DN, DeadN, LazyCallGraph::Edge::Ref);
// Force the graph to be fully expanded.
CG.buildRefSCCs();
auto I = CG.postorder_ref_scc_begin();
LazyCallGraph::RefSCC &DeadRC = *I++;
LazyCallGraph::RefSCC &RC1 = *I++;
LazyCallGraph::RefSCC &RC2 = *I++;
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
ASSERT_EQ(2, RC1.size());
LazyCallGraph::SCC &C1 = RC1[0];
LazyCallGraph::SCC &C2 = RC1[1];
EXPECT_EQ(&DeadRC, CG.lookupRefSCC(DeadN));
EXPECT_EQ(&C1, CG.lookupSCC(DN));
EXPECT_EQ(&C1, CG.lookupSCC(CN));
EXPECT_EQ(&C2, CG.lookupSCC(BN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(DN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(CN));
EXPECT_EQ(&RC1, CG.lookupRefSCC(BN));
EXPECT_EQ(&RC2, CG.lookupRefSCC(AN));
// Now delete 'dead'. There are no uses of this function but there are
// spurious references.
CG.removeDeadFunction(DeadN.getFunction());
// The only observable change should be that the RefSCC is gone from the
// postorder sequence.
I = CG.postorder_ref_scc_begin();
EXPECT_EQ(&RC1, &*I++);
EXPECT_EQ(&RC2, &*I++);
EXPECT_EQ(CG.postorder_ref_scc_end(), I);
}
}
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