1 //===- llvm/unittest/DebugInfo/DWARFFormValueTest.cpp ---------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/Support/Dwarf.h"
13 #include "llvm/Support/Host.h"
14 #include "llvm/Support/LEB128.h"
15 #include "gtest/gtest.h"
16 #include <climits>
17 using namespace llvm;
18 using namespace dwarf;
19
20 namespace {
21
TEST(DWARFFormValue,FixedFormSizes)22 TEST(DWARFFormValue, FixedFormSizes) {
23 // Size of DW_FORM_addr and DW_FORM_ref_addr are equal in DWARF2,
24 // DW_FORM_ref_addr is always 4 bytes in DWARF32 starting from DWARF3.
25 ArrayRef<uint8_t> sizes = DWARFFormValue::getFixedFormSizes(4, 2);
26 EXPECT_EQ(sizes[DW_FORM_addr], sizes[DW_FORM_ref_addr]);
27 sizes = DWARFFormValue::getFixedFormSizes(8, 2);
28 EXPECT_EQ(sizes[DW_FORM_addr], sizes[DW_FORM_ref_addr]);
29 sizes = DWARFFormValue::getFixedFormSizes(8, 3);
30 EXPECT_EQ(4, sizes[DW_FORM_ref_addr]);
31 // Check that we don't have fixed form sizes for weird address sizes.
32 EXPECT_EQ(0U, DWARFFormValue::getFixedFormSizes(16, 2).size());
33 }
34
isFormClass(uint16_t Form,DWARFFormValue::FormClass FC)35 bool isFormClass(uint16_t Form, DWARFFormValue::FormClass FC) {
36 return DWARFFormValue(Form).isFormClass(FC);
37 }
38
TEST(DWARFFormValue,FormClass)39 TEST(DWARFFormValue, FormClass) {
40 EXPECT_TRUE(isFormClass(DW_FORM_addr, DWARFFormValue::FC_Address));
41 EXPECT_FALSE(isFormClass(DW_FORM_data8, DWARFFormValue::FC_Address));
42 EXPECT_TRUE(isFormClass(DW_FORM_data8, DWARFFormValue::FC_Constant));
43 EXPECT_TRUE(isFormClass(DW_FORM_data8, DWARFFormValue::FC_SectionOffset));
44 EXPECT_TRUE(
45 isFormClass(DW_FORM_sec_offset, DWARFFormValue::FC_SectionOffset));
46 EXPECT_TRUE(isFormClass(DW_FORM_GNU_str_index, DWARFFormValue::FC_String));
47 EXPECT_TRUE(isFormClass(DW_FORM_GNU_addr_index, DWARFFormValue::FC_Address));
48 EXPECT_FALSE(isFormClass(DW_FORM_ref_addr, DWARFFormValue::FC_Address));
49 EXPECT_TRUE(isFormClass(DW_FORM_ref_addr, DWARFFormValue::FC_Reference));
50 EXPECT_TRUE(isFormClass(DW_FORM_ref_sig8, DWARFFormValue::FC_Reference));
51 }
52
53 template<typename RawTypeT>
createDataXFormValue(uint16_t Form,RawTypeT Value)54 DWARFFormValue createDataXFormValue(uint16_t Form, RawTypeT Value) {
55 char Raw[sizeof(RawTypeT)];
56 memcpy(Raw, &Value, sizeof(RawTypeT));
57 uint32_t Offset = 0;
58 DWARFFormValue Result(Form);
59 DataExtractor Data(StringRef(Raw, sizeof(RawTypeT)),
60 sys::IsLittleEndianHost, sizeof(void*));
61 Result.extractValue(Data, &Offset, nullptr);
62 return Result;
63 }
64
createULEBFormValue(uint64_t Value)65 DWARFFormValue createULEBFormValue(uint64_t Value) {
66 SmallString<10> RawData;
67 raw_svector_ostream OS(RawData);
68 encodeULEB128(Value, OS);
69 uint32_t Offset = 0;
70 DWARFFormValue Result(DW_FORM_udata);
71 DataExtractor Data(OS.str(), sys::IsLittleEndianHost, sizeof(void*));
72 Result.extractValue(Data, &Offset, nullptr);
73 return Result;
74 }
75
createSLEBFormValue(int64_t Value)76 DWARFFormValue createSLEBFormValue(int64_t Value) {
77 SmallString<10> RawData;
78 raw_svector_ostream OS(RawData);
79 encodeSLEB128(Value, OS);
80 uint32_t Offset = 0;
81 DWARFFormValue Result(DW_FORM_sdata);
82 DataExtractor Data(OS.str(), sys::IsLittleEndianHost, sizeof(void*));
83 Result.extractValue(Data, &Offset, nullptr);
84 return Result;
85 }
86
TEST(DWARFFormValue,SignedConstantForms)87 TEST(DWARFFormValue, SignedConstantForms) {
88 // Check that we correctly sign extend fixed size forms.
89 auto Sign1 = createDataXFormValue<uint8_t>(DW_FORM_data1, -123);
90 auto Sign2 = createDataXFormValue<uint16_t>(DW_FORM_data2, -12345);
91 auto Sign4 = createDataXFormValue<uint32_t>(DW_FORM_data4, -123456789);
92 auto Sign8 = createDataXFormValue<uint64_t>(DW_FORM_data8, -1);
93 EXPECT_EQ(Sign1.getAsSignedConstant().getValue(), -123);
94 EXPECT_EQ(Sign2.getAsSignedConstant().getValue(), -12345);
95 EXPECT_EQ(Sign4.getAsSignedConstant().getValue(), -123456789);
96 EXPECT_EQ(Sign8.getAsSignedConstant().getValue(), -1);
97
98 // Check that we can handle big positive values, but that we return
99 // an error just over the limit.
100 auto UMax = createULEBFormValue(LLONG_MAX);
101 auto TooBig = createULEBFormValue(uint64_t(LLONG_MAX) + 1);
102 EXPECT_EQ(UMax.getAsSignedConstant().getValue(), LLONG_MAX);
103 EXPECT_EQ(TooBig.getAsSignedConstant().hasValue(), false);
104
105 // Sanity check some other forms.
106 auto Data1 = createDataXFormValue<uint8_t>(DW_FORM_data1, 120);
107 auto Data2 = createDataXFormValue<uint16_t>(DW_FORM_data2, 32000);
108 auto Data4 = createDataXFormValue<uint32_t>(DW_FORM_data4, 2000000000);
109 auto Data8 = createDataXFormValue<uint64_t>(DW_FORM_data8, 0x1234567812345678LL);
110 auto LEBMin = createSLEBFormValue(LLONG_MIN);
111 auto LEBMax = createSLEBFormValue(LLONG_MAX);
112 auto LEB1 = createSLEBFormValue(-42);
113 auto LEB2 = createSLEBFormValue(42);
114 EXPECT_EQ(Data1.getAsSignedConstant().getValue(), 120);
115 EXPECT_EQ(Data2.getAsSignedConstant().getValue(), 32000);
116 EXPECT_EQ(Data4.getAsSignedConstant().getValue(), 2000000000);
117 EXPECT_EQ(Data8.getAsSignedConstant().getValue(), 0x1234567812345678LL);
118 EXPECT_EQ(LEBMin.getAsSignedConstant().getValue(), LLONG_MIN);
119 EXPECT_EQ(LEBMax.getAsSignedConstant().getValue(), LLONG_MAX);
120 EXPECT_EQ(LEB1.getAsSignedConstant().getValue(), -42);
121 EXPECT_EQ(LEB2.getAsSignedConstant().getValue(), 42);
122 }
123
124 } // end anonymous namespace
125