1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "gtest/gtest.h"
18
19 #include "berberis/backend/code_emitter.h"
20 #include "berberis/backend/x86_64/machine_ir.h"
21 #include "berberis/backend/x86_64/machine_ir_builder.h"
22 #include "berberis/backend/x86_64/machine_ir_check.h"
23 #include "berberis/base/arena_alloc.h"
24 #include "berberis/guest_state/guest_addr.h"
25
26 namespace berberis {
27
28 namespace {
29
TEST(MachineIR,SplitBasicBlock)30 TEST(MachineIR, SplitBasicBlock) {
31 Arena arena;
32 x86_64::MachineIR machine_ir(&arena);
33
34 x86_64::MachineIRBuilder builder(&machine_ir);
35 auto bb = machine_ir.NewBasicBlock();
36 builder.StartBasicBlock(bb);
37
38 builder.Gen<x86_64::MovqRegImm>(x86_64::kMachineRegRBP, 0);
39 builder.Gen<x86_64::MovqRegImm>(x86_64::kMachineRegRBP, 0);
40 builder.Gen<x86_64::MovqRegImm>(x86_64::kMachineRegRBP, 1);
41 builder.Gen<x86_64::MovqRegImm>(x86_64::kMachineRegRBP, 1);
42 builder.Gen<x86_64::MovqRegImm>(x86_64::kMachineRegRBP, 1);
43 builder.Gen<PseudoJump>(kNullGuestAddr);
44
45 auto insn_it = bb->insn_list().begin();
46 std::advance(insn_it, 2);
47 auto new_bb = machine_ir.SplitBasicBlock(bb, insn_it);
48
49 ASSERT_EQ(x86_64::CheckMachineIR(machine_ir), x86_64::kMachineIRCheckSuccess);
50 EXPECT_TRUE(machine_ir.bb_list().size() == 2);
51 EXPECT_EQ(bb->insn_list().size(), static_cast<unsigned int>(3));
52 EXPECT_EQ(bb->insn_list().back()->opcode(), kMachineOpPseudoBranch);
53 EXPECT_EQ(new_bb->insn_list().size(), static_cast<unsigned int>(4));
54 }
55
TEST(MachineIR,SplitBasicBlockWithOutcomingEdges)56 TEST(MachineIR, SplitBasicBlockWithOutcomingEdges) {
57 Arena arena;
58 x86_64::MachineIR machine_ir(&arena);
59 x86_64::MachineIRBuilder builder(&machine_ir);
60
61 auto* bb1 = machine_ir.NewBasicBlock();
62 auto* bb2 = machine_ir.NewBasicBlock();
63 auto* bb3 = machine_ir.NewBasicBlock();
64 MachineReg vreg = machine_ir.AllocVReg();
65 machine_ir.AddEdge(bb1, bb2);
66 machine_ir.AddEdge(bb1, bb3);
67
68 builder.StartBasicBlock(bb1);
69 builder.Gen<x86_64::MovqRegImm>(vreg, 0);
70 builder.Gen<x86_64::MovqRegImm>(vreg, 0);
71 builder.Gen<PseudoCondBranch>(CodeEmitter::Condition::kZero, bb2, bb3, x86_64::kMachineRegFLAGS);
72
73 builder.StartBasicBlock(bb2);
74 builder.Gen<x86_64::MovqRegImm>(vreg, 0);
75 builder.Gen<PseudoJump>(kNullGuestAddr);
76
77 builder.StartBasicBlock(bb3);
78 builder.Gen<x86_64::MovqRegImm>(vreg, 0);
79 builder.Gen<PseudoJump>(kNullGuestAddr);
80
81 auto insn_it = std::next(bb1->insn_list().begin());
82 MachineBasicBlock* new_bb = machine_ir.SplitBasicBlock(bb1, insn_it);
83
84 ASSERT_EQ(x86_64::CheckMachineIR(machine_ir), x86_64::kMachineIRCheckSuccess);
85 EXPECT_EQ(bb1->out_edges().size(), 1UL);
86 EXPECT_EQ(bb1->out_edges().front()->src(), bb1);
87 EXPECT_EQ(bb1->out_edges().front()->dst(), new_bb);
88
89 EXPECT_EQ(new_bb->in_edges().size(), 1UL);
90 EXPECT_EQ(new_bb->in_edges().front()->src(), bb1);
91 EXPECT_EQ(new_bb->in_edges().front()->dst(), new_bb);
92 EXPECT_EQ(new_bb->out_edges().size(), 2UL);
93 EXPECT_EQ(new_bb->out_edges().front()->src(), new_bb);
94 EXPECT_EQ(new_bb->out_edges().front()->dst(), bb2);
95 EXPECT_EQ(new_bb->out_edges().back()->src(), new_bb);
96 EXPECT_EQ(new_bb->out_edges().back()->dst(), bb3);
97
98 EXPECT_EQ(bb2->in_edges().size(), 1UL);
99 EXPECT_EQ(bb2->in_edges().front()->src(), new_bb);
100 EXPECT_EQ(bb2->in_edges().front()->dst(), bb2);
101
102 EXPECT_EQ(bb3->in_edges().size(), 1UL);
103 EXPECT_EQ(bb3->in_edges().front()->src(), new_bb);
104 EXPECT_EQ(bb3->in_edges().front()->dst(), bb3);
105 }
106
107 } // namespace
108
109 } // namespace berberis
110