Bug Summary

File:lldb/source/DataFormatters/VectorType.cpp
Warning:line 282, column 3
Potential leak of memory pointed to by 'synthetic_children'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name VectorType.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm/tools/clang/stage2-bins -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -isystem /usr/include/libxml2 -D HAVE_ROUND -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/lldb/source/DataFormatters -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/lldb/source/DataFormatters -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/lldb/include -I tools/lldb/include -I include -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/llvm/include -I /usr/include/python3.9 -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/clang/include -I tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/lldb/source -I tools/lldb/source -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fmacro-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-deprecated-register -Wno-vla-extension -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-01-19-134126-35450-1 -x c++ /build/llvm-toolchain-snapshot-14~++20220119111520+da61cb019eb2/lldb/source/DataFormatters/VectorType.cpp
1//===-- VectorType.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 "lldb/DataFormatters/VectorType.h"
10
11#include "lldb/Core/ValueObject.h"
12#include "lldb/DataFormatters/FormattersHelpers.h"
13#include "lldb/Symbol/CompilerType.h"
14#include "lldb/Symbol/TypeSystem.h"
15#include "lldb/Target/Target.h"
16
17#include "lldb/Utility/LLDBAssert.h"
18#include "lldb/Utility/Log.h"
19
20using namespace lldb;
21using namespace lldb_private;
22using namespace lldb_private::formatters;
23
24static CompilerType GetCompilerTypeForFormat(lldb::Format format,
25 CompilerType element_type,
26 TypeSystem *type_system) {
27 lldbassert(type_system && "type_system needs to be not NULL")lldb_private::lldb_assert(static_cast<bool>(type_system
&& "type_system needs to be not NULL"), "type_system && \"type_system needs to be not NULL\""
, __FUNCTION__, "lldb/source/DataFormatters/VectorType.cpp", 27
)
;
28
29 switch (format) {
30 case lldb::eFormatAddressInfo:
31 case lldb::eFormatPointer:
32 return type_system->GetBuiltinTypeForEncodingAndBitSize(
33 eEncodingUint, 8 * type_system->GetPointerByteSize());
34
35 case lldb::eFormatBoolean:
36 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeBool);
37
38 case lldb::eFormatBytes:
39 case lldb::eFormatBytesWithASCII:
40 case lldb::eFormatChar:
41 case lldb::eFormatCharArray:
42 case lldb::eFormatCharPrintable:
43 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeChar);
44
45 case lldb::eFormatComplex /* lldb::eFormatComplexFloat */:
46 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeFloatComplex);
47
48 case lldb::eFormatCString:
49 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeChar)
50 .GetPointerType();
51
52 case lldb::eFormatFloat:
53 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeFloat);
54
55 case lldb::eFormatHex:
56 case lldb::eFormatHexUppercase:
57 case lldb::eFormatOctal:
58 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeInt);
59
60 case lldb::eFormatHexFloat:
61 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeFloat);
62
63 case lldb::eFormatUnicode16:
64 case lldb::eFormatUnicode32:
65
66 case lldb::eFormatUnsigned:
67 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeUnsignedInt);
68
69 case lldb::eFormatVectorOfChar:
70 return type_system->GetBasicTypeFromAST(lldb::eBasicTypeChar);
71
72 case lldb::eFormatVectorOfFloat32:
73 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingIEEE754,
74 32);
75
76 case lldb::eFormatVectorOfFloat64:
77 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingIEEE754,
78 64);
79
80 case lldb::eFormatVectorOfSInt16:
81 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingSint, 16);
82
83 case lldb::eFormatVectorOfSInt32:
84 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingSint, 32);
85
86 case lldb::eFormatVectorOfSInt64:
87 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingSint, 64);
88
89 case lldb::eFormatVectorOfSInt8:
90 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingSint, 8);
91
92 case lldb::eFormatVectorOfUInt128:
93 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 128);
94
95 case lldb::eFormatVectorOfUInt16:
96 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 16);
97
98 case lldb::eFormatVectorOfUInt32:
99 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 32);
100
101 case lldb::eFormatVectorOfUInt64:
102 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 64);
103
104 case lldb::eFormatVectorOfUInt8:
105 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 8);
106
107 case lldb::eFormatDefault:
108 return element_type;
109
110 case lldb::eFormatBinary:
111 case lldb::eFormatComplexInteger:
112 case lldb::eFormatDecimal:
113 case lldb::eFormatEnum:
114 case lldb::eFormatInstruction:
115 case lldb::eFormatOSType:
116 case lldb::eFormatVoid:
117 default:
118 return type_system->GetBuiltinTypeForEncodingAndBitSize(eEncodingUint, 8);
119 }
120}
121
122static lldb::Format GetItemFormatForFormat(lldb::Format format,
123 CompilerType element_type) {
124 switch (format) {
125 case lldb::eFormatVectorOfChar:
126 return lldb::eFormatChar;
127
128 case lldb::eFormatVectorOfFloat32:
129 case lldb::eFormatVectorOfFloat64:
130 return lldb::eFormatFloat;
131
132 case lldb::eFormatVectorOfSInt16:
133 case lldb::eFormatVectorOfSInt32:
134 case lldb::eFormatVectorOfSInt64:
135 case lldb::eFormatVectorOfSInt8:
136 return lldb::eFormatDecimal;
137
138 case lldb::eFormatVectorOfUInt128:
139 case lldb::eFormatVectorOfUInt16:
140 case lldb::eFormatVectorOfUInt32:
141 case lldb::eFormatVectorOfUInt64:
142 case lldb::eFormatVectorOfUInt8:
143 return lldb::eFormatUnsigned;
144
145 case lldb::eFormatBinary:
146 case lldb::eFormatComplexInteger:
147 case lldb::eFormatDecimal:
148 case lldb::eFormatEnum:
149 case lldb::eFormatInstruction:
150 case lldb::eFormatOSType:
151 case lldb::eFormatVoid:
152 return eFormatHex;
153
154 case lldb::eFormatDefault: {
155 // special case the (default, char) combination to actually display as an
156 // integer value most often, you won't want to see the ASCII characters...
157 // (and if you do, eFormatChar is a keystroke away)
158 bool is_char = element_type.IsCharType();
159 bool is_signed = false;
160 element_type.IsIntegerType(is_signed);
161 return is_char ? (is_signed ? lldb::eFormatDecimal : eFormatHex) : format;
162 } break;
163
164 default:
165 return format;
166 }
167}
168
169static size_t CalculateNumChildren(
170 CompilerType container_type, CompilerType element_type,
171 lldb_private::ExecutionContextScope *exe_scope =
172 nullptr // does not matter here because all we trade in are basic types
173 ) {
174 llvm::Optional<uint64_t> container_size =
175 container_type.GetByteSize(exe_scope);
176 llvm::Optional<uint64_t> element_size = element_type.GetByteSize(exe_scope);
177
178 if (container_size && element_size && *element_size) {
179 if (*container_size % *element_size)
180 return 0;
181 return *container_size / *element_size;
182 }
183 return 0;
184}
185
186namespace lldb_private {
187namespace formatters {
188
189class VectorTypeSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
190public:
191 VectorTypeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
192 : SyntheticChildrenFrontEnd(*valobj_sp), m_parent_format(eFormatInvalid),
193 m_item_format(eFormatInvalid), m_child_type(), m_num_children(0) {}
194
195 ~VectorTypeSyntheticFrontEnd() override = default;
196
197 size_t CalculateNumChildren() override { return m_num_children; }
198
199 lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
200 if (idx >= CalculateNumChildren())
201 return {};
202 llvm::Optional<uint64_t> size = m_child_type.GetByteSize(nullptr);
203 if (!size)
204 return {};
205 auto offset = idx * *size;
206 StreamString idx_name;
207 idx_name.Printf("[%" PRIu64"l" "u" "]", (uint64_t)idx);
208 ValueObjectSP child_sp(m_backend.GetSyntheticChildAtOffset(
209 offset, m_child_type, true, ConstString(idx_name.GetString())));
210 if (!child_sp)
211 return child_sp;
212
213 child_sp->SetFormat(m_item_format);
214
215 return child_sp;
216 }
217
218 bool Update() override {
219 m_parent_format = m_backend.GetFormat();
220 CompilerType parent_type(m_backend.GetCompilerType());
221 CompilerType element_type;
222 parent_type.IsVectorType(&element_type);
223 m_child_type = ::GetCompilerTypeForFormat(m_parent_format, element_type,
224 parent_type.GetTypeSystem());
225 m_num_children = ::CalculateNumChildren(parent_type, m_child_type);
226 m_item_format = GetItemFormatForFormat(m_parent_format, m_child_type);
227 return false;
228 }
229
230 bool MightHaveChildren() override { return true; }
231
232 size_t GetIndexOfChildWithName(ConstString name) override {
233 const char *item_name = name.GetCString();
234 uint32_t idx = ExtractIndexFromString(item_name);
235 if (idx < UINT32_MAX(4294967295U) && idx >= CalculateNumChildren())
236 return UINT32_MAX(4294967295U);
237 return idx;
238 }
239
240private:
241 lldb::Format m_parent_format;
242 lldb::Format m_item_format;
243 CompilerType m_child_type;
244 size_t m_num_children;
245};
246
247} // namespace formatters
248} // namespace lldb_private
249
250bool lldb_private::formatters::VectorTypeSummaryProvider(
251 ValueObject &valobj, Stream &s, const TypeSummaryOptions &) {
252 auto synthetic_children =
253 VectorTypeSyntheticFrontEndCreator(nullptr, valobj.GetSP());
1
Calling 'VectorTypeSyntheticFrontEndCreator'
4
Returned allocated memory
254 if (!synthetic_children
4.1
'synthetic_children' is non-null
)
5
Taking false branch
255 return false;
256
257 synthetic_children->Update();
258
259 s.PutChar('(');
260 bool first = true;
261
262 size_t idx = 0, len = synthetic_children->CalculateNumChildren();
263
264 for (; idx < len; idx++) {
6
Loop condition is false. Execution continues on line 282
265 auto child_sp = synthetic_children->GetChildAtIndex(idx);
266 if (!child_sp)
267 continue;
268 child_sp = child_sp->GetQualifiedRepresentationIfAvailable(
269 lldb::eDynamicDontRunTarget, true);
270
271 const char *child_value = child_sp->GetValueAsCString();
272 if (child_value && *child_value) {
273 if (first) {
274 s.Printf("%s", child_value);
275 first = false;
276 } else {
277 s.Printf(", %s", child_value);
278 }
279 }
280 }
281
282 s.PutChar(')');
7
Potential leak of memory pointed to by 'synthetic_children'
283
284 return true;
285}
286
287lldb_private::SyntheticChildrenFrontEnd *
288lldb_private::formatters::VectorTypeSyntheticFrontEndCreator(
289 CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
290 if (!valobj_sp)
2
Taking false branch
291 return nullptr;
292 return new VectorTypeSyntheticFrontEnd(valobj_sp);
3
Memory is allocated
293}