1 //===- llvm/unittest/DebugInfo/DWARFExpressionCompactPrinterTest.cpp ------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "DwarfGenerator.h"
10 #include "llvm/ADT/ArrayRef.h"
11 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
12 #include "llvm/DebugInfo/DWARF/DWARFDie.h"
13 #include "llvm/DebugInfo/DWARF/DWARFExpression.h"
14 #include "llvm/MC/MCInstrInfo.h"
15 #include "llvm/MC/MCRegisterInfo.h"
16 #include "llvm/MC/TargetRegistry.h"
17 #include "llvm/Support/DataExtractor.h"
18 #include "llvm/Support/TargetSelect.h"
19 #include "llvm/Testing/Support/Error.h"
20 #include "gtest/gtest.h"
21 
22 using namespace llvm;
23 using namespace dwarf;
24 
25 namespace {
26 class DWARFExpressionCompactPrinterTest : public ::testing::Test {
27 public:
28   std::unique_ptr<MCRegisterInfo> MRI;
29 
30   DWARFExpressionCompactPrinterTest() {
31     InitializeAllTargets();
32     InitializeAllTargetMCs();
33     InitializeAllAsmPrinters();
34 
35     std::string TripleName = "armv8a-linux-gnueabi";
36     std::string ErrorStr;
37 
38     const Target *TheTarget =
39         TargetRegistry::lookupTarget(TripleName, ErrorStr);
40 
41     if (!TheTarget)
42       return;
43 
44     MRI.reset(TheTarget->createMCRegInfo(TripleName));
45   }
46 
47   void TestExprPrinter(ArrayRef<uint8_t> ExprData, StringRef Expected);
48 };
49 } // namespace
50 
51 void DWARFExpressionCompactPrinterTest::TestExprPrinter(
52     ArrayRef<uint8_t> ExprData, StringRef Expected) {
53   // If we didn't build ARM, do not run the test.
54   if (!MRI)
55     GTEST_SKIP();
56 
57   // Print the expression, passing in the subprogram DIE, and check that the
58   // result is as expected.
59   std::string Result;
60   raw_string_ostream OS(Result);
61   DataExtractor DE(ExprData, true, 8);
62   DWARFExpression Expr(DE, 8);
63   Expr.printCompact(OS, *MRI);
64   EXPECT_EQ(OS.str(), Expected);
65 }
66 
67 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_reg0) {
68   TestExprPrinter({DW_OP_reg0}, "R0");
69 }
70 
71 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_reg10) {
72   TestExprPrinter({DW_OP_reg10}, "R10");
73 }
74 
75 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_regx) {
76   TestExprPrinter({DW_OP_regx, 0x80, 0x02}, "D0");
77 }
78 
79 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0) {
80   TestExprPrinter({DW_OP_breg0, 0x04}, "[R0+4]");
81 }
82 
83 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0_large_offset) {
84   TestExprPrinter({DW_OP_breg0, 0x80, 0x02}, "[R0+256]");
85 }
86 
87 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg13) {
88   TestExprPrinter({DW_OP_breg13, 0x10}, "[SP+16]");
89 }
90 
91 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg13_zero_offset) {
92   TestExprPrinter({DW_OP_breg13, 0x00}, "[SP]");
93 }
94 
95 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0_negative) {
96   TestExprPrinter({DW_OP_breg0, 0x70}, "[R0-16]");
97 }
98 
99 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_bregx) {
100   TestExprPrinter({DW_OP_bregx, 0x0d, 0x28}, "[SP+40]");
101 }
102 
103 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_stack_value) {
104   TestExprPrinter({DW_OP_breg13, 0x04, DW_OP_stack_value}, "SP+4");
105 }
106 
107 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value) {
108   TestExprPrinter({DW_OP_entry_value, 0x01, DW_OP_reg0, DW_OP_stack_value},
109                   "entry(R0)");
110 }
111 
112 TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value_mem) {
113   TestExprPrinter(
114       {DW_OP_entry_value, 0x02, DW_OP_breg13, 0x10, DW_OP_stack_value},
115       "entry([SP+16])");
116 }
117