High level conclusions

Fuzzers reach 75.86% code coverage.

Fuzzers reach 83.88% of cyclomatic complexity.

Fuzzers reach 72.56% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

1452 / 2001

Cyclomatic complexity statically reachable by fuzzers

12898 / 15376

Runtime code coverage of functions

1518 / 2001

Warning: The number of runtime covered functions are larger than the number of reachable functions. This means that Fuzz Introspector found there are more functions covered at runtime than what is considered reachable based on the static analysis. This is a limitation in the analysis as anything covered at runtime is by definition reachable by the fuzzers.
This is likely due to a limitation in the static analysis. In this case, the count of functions covered at runtime is the true value, which means this is what should be considered "achieved" by the fuzzer.

Use the project functions table below to query all functions that were not covered at runtime.

The following table shows data about each function in the project. The functions included in this table correspond to all functions that exist in the executables of the fuzzers. As such, there may be functions that are from third-party libraries.

For further technical details on the meaning of columns in the below table, please see the Glossary .

Func name	Functions filename	Args	Function call depth	Reached by Fuzzers	Runtime reached by Fuzzers	Combined reached by Fuzzers	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzzer: flexverifier_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	1	1.02%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	97	98.9%
All colors	98	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
1	58	flexbuffers::Vector::operator[](unsigned long) const	call site: 00058

Runtime coverage analysis

Covered functions

47

Functions that are reachable but not covered

2

Reachable functions

95

Percentage of reachable functions covered

97.89%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flexbuffers_verifier_fuzzer.cc	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	39
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	8

Fuzzer: verifier_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	2	0.46%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	425	99.5%
All colors	427	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
1	204	flexbuffers::VerifyBuffer(unsigned char const*, unsigned long, std::__1::vector >*)	call site: 00204
1	257	flexbuffers::Vector::operator[](unsigned long) const	call site: 00257

Runtime coverage analysis

Covered functions

215

Functions that are reachable but not covered

8

Reachable functions

424

Percentage of reachable functions covered

98.11%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_verifier_fuzzer.cc	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/verifier.h	55
/src/flatbuffers/tests/fuzzer/../../tests/cpp17/generated_cpp17/monster_test_generated.h	42
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	6
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	10
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	50
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	15
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flex_flat_util.h	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	39

Fuzzer: 64bit_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	13	4.98%
gold	[1:9]	2	0.76%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	246	94.2%
All colors	261	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
12	165	flatbuffers::AccessBuffer(unsigned char const*, unsigned long, bool)	call site: 00165	_Z20scalar_as_underlyingIbEN20underlying_of_scalarIT_Xsr11flatbuffers7is_enumIS1_EE5valueEE4typeES1_
1	14	bool flatbuffers::VerifierTemplate ::VerifyBufferFromStart (char const*, unsigned long)	call site: 00014

Runtime coverage analysis

Covered functions

253

Functions that are reachable but not covered

12

Reachable functions

312

Percentage of reachable functions covered

96.15%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_64bit_fuzzer.cc	12
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/verifier.h	34
/src/flatbuffers/tests/fuzzer/../../tests/64bit/test_64bit_generated.h	20
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	11
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	9
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	30
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	38
/src/flatbuffers/tests/fuzzer/../../tests/test_assert.h	2
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	1
/src/flatbuffers/tests/test_assert.cpp	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	2

Fuzzer: annotator_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	195	17.8%
gold	[1:9]	0	0.0%
yellow	[10:29]	6	0.54%
greenyellow	[30:49]	27	2.47%
lawngreen	50+	863	79.1%
All colors	1091	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
44	320	flatbuffers::Vector , unsigned int>::Get(unsigned int) const	call site: 00320	_ZNK11flatbuffers16VerifierTemplateILb0EE12VerifyVectorITpTnRiJENS_6OffsetIN10reflection8KeyValueEEEjEEbPKNS_6VectorIT0_T1_EE
15	302	flatbuffers::Vector , unsigned int>::Get(unsigned int) const	call site: 00302	_ZNK11flatbuffers16VerifierTemplateILb0EE12VerifyVectorITpTnRiJENS_6OffsetIN10reflection7RPCCallEEEjEEbPKNS_6VectorIT0_T1_EE
13	378	flatbuffers::Vector , unsigned int>::Get(unsigned int) const	call site: 00378	_ZNK11flatbuffers16VerifierTemplateILb0EE12VerifyVectorITpTnRiJENS_6OffsetINS_6StringEEEjEEbPKNS_6VectorIT0_T1_EE
11	152	flatbuffers::Vector , unsigned int>::Get(unsigned int) const	call site: 00152
10	430	flatbuffers::BinaryAnnotator::BuildHeader(unsigned long)	call site: 00430	bsearch
9	550	flatbuffers::BinaryAnnotator::GetOrBuildVTable(unsigned long, reflection::Object const*, unsigned long)	call site: 00550
8	418	std::__1::optional flatbuffers::BinaryAnnotator::ReadScalar (unsigned long) const	call site: 00418
6	402	flatbuffers::BinaryAnnotator::IsValidRead(unsigned long, unsigned long) const	call site: 00402
6	582	flatbuffers::BinaryAnnotator::GetOrBuildVTable(unsigned long, reflection::Object const*, unsigned long)	call site: 00582
6	855	flatbuffers::BinaryAnnotator::BuildVector(unsigned long, reflection::Object const*, reflection::Field const*, unsigned long, std::__1::map , std::__1::allocator > >)	call site: 00855
6	887	flatbuffers::BinaryAnnotator::BuildVector(unsigned long, reflection::Object const*, reflection::Field const*, unsigned long, std::__1::map , std::__1::allocator > >)	call site: 00887
6	920	flatbuffers::BinaryAnnotator::BuildVector(unsigned long, reflection::Object const*, reflection::Field const*, unsigned long, std::__1::map , std::__1::allocator > >)	call site: 00920

Runtime coverage analysis

Covered functions

233

Functions that are reachable but not covered

133

Reachable functions

573

Percentage of reachable functions covered

76.79%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_annotator_fuzzer.cc	1
/src/flatbuffers/tests/fuzzer/../../src/binary_annotator.h	6
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection_generated.h	64
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	14
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	13
/src/flatbuffers/src/binary_annotator.cpp	19
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/verifier.h	48
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	41
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	31
/src/flatbuffers/src/binary_annotator.h	30
/usr/local/bin/../include/c++/v1/optional	17
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	2
/src/flatbuffers/src/reflection.cpp	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection.h	2
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	1

Fuzzer: scalar_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	2266	68.6%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	1033	31.3%
All colors	3299	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
341	932	flatbuffers::Parser::ParseMetaData(flatbuffers::SymbolTable *)	call site: 00932	tolower
227	3042	flatbuffers::JsonPrinter::GenStruct(flatbuffers::StructDef const&, flatbuffers::Table const*, int)	call site: 03042
212	2827	void flatbuffers::JsonPrinter::GenField (flatbuffers::FieldDef const&, flatbuffers::Table const*, bool, int)	call site: 02827	strlen
131	1297	flatbuffers::Parser::AddField(flatbuffers::StructDef&, std::__1::basic_string , std::__1::allocator > const&, flatbuffers::Type const&, flatbuffers::FieldDef**)	call site: 01297	strpbrk
109	2285	flatbuffers::Parser::ParseTable(flatbuffers::StructDef const&, std::__1::basic_string , std::__1::allocator >*, unsigned int*)	call site: 02285	_ZN11flatbuffers21FlatBufferBuilderImplILb0EE15CalculateOffsetIjEENSt3__19enable_ifIXsr3std7is_sameIT_jEE5valueES5_E4typeEv
66	270	flatbuffers::CheckedError::CheckedError(flatbuffers::CheckedError const&)	call site: 00270
61	2422	flatbuffers::Parser::ParseAnyValue(flatbuffers::Value&, flatbuffers::FieldDef*, unsigned long, flatbuffers::StructDef const*, unsigned long, bool)	call site: 02422
57	1542	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 01542
57	2028	std::__1::enable_if ::type flatbuffers::FlatBufferBuilderImpl ::GetSizeRelative32BitRegion () const	call site: 02028
54	528	flatbuffers::Parser::StartStruct(std::__1::basic_string , std::__1::allocator > const&, flatbuffers::StructDef**)	call site: 00528
53	353	flatbuffers::strtoval_impl(double*, char const*, char**)	call site: 00353
35	457	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 00457

Runtime coverage analysis

Covered functions

385

Functions that are reachable but not covered

1048

Reachable functions

1922

Percentage of reachable functions covered

45.47%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_scalar_fuzzer.cc	18
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/idl.h	105
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	29
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flatbuffer_builder.h	92
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector_downward.h	33
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/default_allocator.h	7
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/allocator.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	121
/src/flatbuffers/src/idl_parser.cpp	177
/src/flatbuffers/src/util.cpp	18
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	47
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	35
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/hash.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection.h	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	57
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	30
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	2
/src/flatbuffers/tests/fuzzer/../../tests/test_assert.h	2
/src/flatbuffers/tests/test_assert.cpp	2
/src/flatbuffers/tests/fuzzer/test_init.h	1
/src/flatbuffers/src/idl_gen_text.cpp	89
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/struct.h	11
/usr/local/bin/../include/c++/v1/optional	20
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/array.h	44

Fuzzer: parser_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	595	23.1%
gold	[1:9]	66	2.57%
yellow	[10:29]	27	1.05%
greenyellow	[30:49]	31	1.20%
lawngreen	50+	1846	71.9%
All colors	2565	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
158	1050	flatbuffers::EnumValBuilder::~EnumValBuilder()	call site: 01050	tolower
131	1232	flatbuffers::Parser::AddField(flatbuffers::StructDef&, std::__1::basic_string , std::__1::allocator > const&, flatbuffers::Type const&, flatbuffers::FieldDef**)	call site: 01232	strpbrk
47	923	flatbuffers::Parser::ParseEnum(bool, flatbuffers::EnumDef**, char const*)	call site: 00923
19	463	flatbuffers::Parser::StartStruct(std::__1::basic_string , std::__1::allocator > const&, flatbuffers::StructDef**)	call site: 00463
17	1828	flatbuffers::Parser::CheckPrivateLeak()	call site: 01828
14	413	flatbuffers::Parser::ParseNamespace()	call site: 00413
14	2504	flatbuffers::Parser::Parse(char const*, char const**, char const*)	call site: 02504	_ZN11flatbuffers21FlatBufferBuilderImplILb0EE12CreateVectorIhTtTpTyENS_6OffsetETtTpTyENS_6VectorEEET0_IJT1_IJT_EEEEPKS7_m
12	2490	flatbuffers::Parser::ParseVector(flatbuffers::Type const&, unsigned int*, flatbuffers::FieldDef*, unsigned long)	call site: 02490
11	1395	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 01395
9	500	flatbuffers::Parser::ParseEnum(bool, flatbuffers::EnumDef**, char const*)	call site: 00500
9	1003	flatbuffers::Parser::ParseEnum(bool, flatbuffers::EnumDef**, char const*)	call site: 01003
7	2	LLVMFuzzerTestOneInput	call site: 00002

Runtime coverage analysis

Covered functions

541

Functions that are reachable but not covered

152

Reachable functions

1223

Percentage of reachable functions covered

87.57%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_parser_fuzzer.cc	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/idl.h	105
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	15
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flatbuffer_builder.h	92
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector_downward.h	33
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/default_allocator.h	7
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/allocator.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	50
/src/flatbuffers/src/idl_parser.cpp	176
/src/flatbuffers/src/util.cpp	18
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	43
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	35
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/hash.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection.h	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	11
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	1

Fuzzer: monster_fuzzer

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color	Runtime hitcount	Callsite count	Percentage
red	0	1693	47.0%
gold	[1:9]	52	1.44%
yellow	[10:29]	20	0.55%
greenyellow	[30:49]	14	0.38%
lawngreen	50+	1821	50.5%
All colors	3600	100

Fuzz blockers

The following nodes represent call sites where fuzz blockers occur.

Amount of callsites blocked	Calltree index	Parent function	Callsite	Largest blocked function
494	1402	flatbuffers::EnumDef::EnumDef()	call site: 01402	tolower
251	2211	flatbuffers::Parser::ParseDecl(char const*)	call site: 02211	strlen
139	1897	flatbuffers::FieldDef::FieldDef()	call site: 01897	strpbrk
82	3505	flatbuffers::Vector , unsigned int>::Get(unsigned int) const	call site: 03505
57	2150	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 02150
38	3317	flexbuffers::Reference::ToString(bool, bool, std::__1::basic_string , std::__1::allocator >&, bool, int, char const*, bool) const	call site: 03317
35	1355	flatbuffers::StructDef* flatbuffers::(anonymous namespace)::LookupTableByName (flatbuffers::SymbolTable const&, std::__1::basic_string , std::__1::allocator > const&, flatbuffers::Namespace const&, unsigned long)	call site: 01355
34	1005	flatbuffers::Parser::ParseFunction(std::__1::basic_string , std::__1::allocator > const*, flatbuffers::Value&)	call site: 01005
32	2047	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 02047
31	955	flatbuffers::Parser::ParseSingleValue(std::__1::basic_string , std::__1::allocator > const*, flatbuffers::Value&, bool)	call site: 00955
31	1317	flatbuffers::Parser::UniqueNamespace(flatbuffers::Namespace*)	call site: 01317
18	2093	flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)	call site: 02093

Runtime coverage analysis

Covered functions

967

Functions that are reachable but not covered

561

Reachable functions

2227

Percentage of reachable functions covered

74.81%

NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
/src/flatbuffers/tests/fuzzer/flatbuffers_monster_fuzzer.cc	2
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/idl.h	105
/src/flatbuffers/src/idl_parser.cpp	177
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flatbuffer_builder.h	92
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector_downward.h	33
/src/flatbuffers/src/util.cpp	18
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	47
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	139
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	35
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/default_allocator.h	7
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/allocator.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	35
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection.h	1
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	69
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/hash.h	4
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	73
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	2
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/verifier.h	55
/src/flatbuffers/tests/fuzzer/../../tests/cpp17/generated_cpp17/monster_test_generated.h	42
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flex_flat_util.h	1
/src/flatbuffers/tests/fuzzer/../../tests/test_assert.h	3
/src/flatbuffers/tests/test_assert.cpp	2
/src/flatbuffers/src/idl_gen_text.cpp	89
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/struct.h	11
/usr/local/bin/../include/c++/v1/optional	20
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/array.h	44

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name	Functions filename	Arg count	Args	Function depth	hitcount	instr count	bb count	cyclomatic complexity	Reachable functions	Incoming references	total cyclomatic complexity	Unreached complexity
flatbuffers::Parser::Serialize()	/src/flatbuffers/src/idl_parser.cpp	1	['N/A']	18	0	630	90	64	729	0	1113	693
flatbuffers::Parser::Deserialize(unsignedcharconst*,unsignedlong)	/src/flatbuffers/src/idl_parser.cpp	3	['N/A', 'N/A', 'size_t']	12	0	86	15	6	513	0	894	377
flatbuffers::CopyTable(flatbuffers::FlatBufferBuilderImpl &,reflection::Schemaconst&,reflection::Objectconst&,flatbuffers::Tableconst&,bool)	/src/flatbuffers/src/reflection.cpp	5	['N/A', 'N/A', 'N/A', 'N/A', 'bool']	14	0	852	170	95	366	1	629	302
flatbuffers::(anonymousnamespace)::VerifyObject(flatbuffers::VerifierTemplate &,reflection::Schemaconst&,reflection::Objectconst&,flatbuffers::Tableconst*,bool)	/src/flatbuffers/src/reflection.cpp	5	['N/A', 'N/A', 'N/A', 'N/A', 'bool']	13	0	361	67	19	304	5	472	191
flatbuffers::Parser::ConformTo(flatbuffers::Parserconst&)	/src/flatbuffers/src/idl_parser.cpp	3	['N/A', 'N/A', 'N/A']	2	0	734	129	114	22	0	179	129
flatbuffers::GetAnyValueS(reflection::BaseType,unsignedcharconst*,reflection::Schemaconst*,int)	/src/flatbuffers/src/reflection.cpp	5	['N/A', 'int', 'N/A', 'N/A', 'int']	9	0	305	63	46	171	2	337	99
flatbuffers::BinaryAnnotator::BuildStruct(unsignedlong,std::__1::vector >&,std::__1::basic_string ,std::__1::allocator >,reflection::Objectconst*)::$_0::operator()(reflection::Fieldconst*)const	/src/flatbuffers/src/binary_annotator.cpp	2	['N/A', 'N/A']	9	0	896	142	91	134	0	285	91

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers

1846 / 2001

Cyclomatic complexity statically reachable by fuzzers

14620 / 15376

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name	Functions filename	Args	Function call depth	Reached by Fuzzers	Runtime reached by Fuzzers	Combined reached by Fuzzers	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

This sections provides heuristics that can be used as input to a fuzz engine when running a given fuzz target. The current focus is on providing input that is usable by libFuzzer.

/src/flatbuffers/tests/fuzzer/flexbuffers_verifier_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flexbuffers::Vector::operator[](unsigned long) const']

/src/flatbuffers/tests/fuzzer/flatbuffers_verifier_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flexbuffers::VerifyBuffer(unsigned char const*, unsigned long, std::__1::vector >*)', 'flexbuffers::Vector::operator[](unsigned long) const']

/src/flatbuffers/tests/fuzzer/flatbuffers_64bit_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flatbuffers::AccessBuffer(unsigned char const*, unsigned long, bool)', 'bool flatbuffers::VerifierTemplate::VerifyBufferFromStart(char const*, unsigned long)']

/src/flatbuffers/tests/fuzzer/flatbuffers_annotator_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flatbuffers::Vector, unsigned int>::Get(unsigned int) const', 'flatbuffers::Vector, unsigned int>::Get(unsigned int) const', 'flatbuffers::Vector, unsigned int>::Get(unsigned int) const', 'flatbuffers::Vector, unsigned int>::Get(unsigned int) const', 'flatbuffers::BinaryAnnotator::BuildHeader(unsigned long)', 'flatbuffers::BinaryAnnotator::GetOrBuildVTable(unsigned long, reflection::Object const*, unsigned long)', 'std::__1::optional flatbuffers::BinaryAnnotator::ReadScalar(unsigned long) const', 'flatbuffers::BinaryAnnotator::IsValidRead(unsigned long, unsigned long) const', 'flatbuffers::BinaryAnnotator::GetOrBuildVTable(unsigned long, reflection::Object const*, unsigned long)', 'flatbuffers::BinaryAnnotator::BuildVector(unsigned long, reflection::Object const*, reflection::Field const*, unsigned long, std::__1::map, std::__1::allocator > >)']

/src/flatbuffers/tests/fuzzer/flatbuffers_scalar_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flatbuffers::Parser::ParseMetaData(flatbuffers::SymbolTable*)', 'flatbuffers::JsonPrinter::GenStruct(flatbuffers::StructDef const&, flatbuffers::Table const*, int)', 'void flatbuffers::JsonPrinter::GenField(flatbuffers::FieldDef const&, flatbuffers::Table const*, bool, int)', 'flatbuffers::Parser::AddField(flatbuffers::StructDef&, std::__1::basic_string, std::__1::allocator > const&, flatbuffers::Type const&, flatbuffers::FieldDef**)', 'flatbuffers::Parser::ParseTable(flatbuffers::StructDef const&, std::__1::basic_string, std::__1::allocator >*, unsigned int*)', 'flatbuffers::CheckedError::CheckedError(flatbuffers::CheckedError const&)', 'flatbuffers::Parser::ParseAnyValue(flatbuffers::Value&, flatbuffers::FieldDef*, unsigned long, flatbuffers::StructDef const*, unsigned long, bool)', 'flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)', 'std::__1::enable_if::type flatbuffers::FlatBufferBuilderImpl::GetSizeRelative32BitRegion() const', 'flatbuffers::Parser::StartStruct(std::__1::basic_string, std::__1::allocator > const&, flatbuffers::StructDef**)']

/src/flatbuffers/tests/fuzzer/flatbuffers_parser_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flatbuffers::EnumValBuilder::~EnumValBuilder()', 'flatbuffers::Parser::AddField(flatbuffers::StructDef&, std::__1::basic_string, std::__1::allocator > const&, flatbuffers::Type const&, flatbuffers::FieldDef**)', 'flatbuffers::Parser::ParseEnum(bool, flatbuffers::EnumDef**, char const*)', 'flatbuffers::Parser::StartStruct(std::__1::basic_string, std::__1::allocator > const&, flatbuffers::StructDef**)', 'flatbuffers::Parser::CheckPrivateLeak()', 'flatbuffers::Parser::ParseNamespace()', 'flatbuffers::Parser::Parse(char const*, char const**, char const*)', 'flatbuffers::Parser::ParseVector(flatbuffers::Type const&, unsigned int*, flatbuffers::FieldDef*, unsigned long)', 'flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)', 'flatbuffers::Parser::ParseEnum(bool, flatbuffers::EnumDef**, char const*)']

/src/flatbuffers/tests/fuzzer/flatbuffers_monster_fuzzer.cc

Dictionary

Use this with the libFuzzer -dict=DICT.file flag

Fuzzer function priority

Use one of these functions as input to libfuzzer with flag: -focus_function name

-focus_function=['flatbuffers::EnumDef::EnumDef()', 'flatbuffers::Parser::ParseDecl(char const*)', 'flatbuffers::FieldDef::FieldDef()', 'flatbuffers::Vector, unsigned int>::Get(unsigned int) const', 'flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)', 'flexbuffers::Reference::ToString(bool, bool, std::__1::basic_string, std::__1::allocator >&, bool, int, char const*, bool) const', 'flatbuffers::StructDef* flatbuffers::(anonymous namespace)::LookupTableByName(flatbuffers::SymbolTable const&, std::__1::basic_string, std::__1::allocator > const&, flatbuffers::Namespace const&, unsigned long)', 'flatbuffers::Parser::ParseFunction(std::__1::basic_string, std::__1::allocator > const*, flatbuffers::Value&)', 'flatbuffers::Parser::DoParse(char const*, char const**, char const*, char const*)', 'flatbuffers::Parser::ParseSingleValue(std::__1::basic_string, std::__1::allocator > const*, flatbuffers::Value&, bool)']

This section shows analysis of runtime coverage data.

For futher technical details on how this section is generated, please see the Glossary .

Complex functions with low coverage

Func name	Function total lines	Lines covered at runtime	percentage covered	Reached by fuzzers
flatbuffers::BinaryAnnotator::BuildHeader(unsignedlong)	58	31	53.44%	['annotator_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (signedchar,flatbuffers::Typeconst&,int)	36	14	38.88%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (short,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (unsignedshort,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (int,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (unsignedint,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (long,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (float,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
voidflatbuffers::JsonPrinter::PrintScalar (double,flatbuffers::Typeconst&,int)	36	6	16.66%	['monster_fuzzer', 'scalar_fuzzer']
flatbuffers::Parser::ParseRoot(charconst*,charconst**,charconst*)	76	35	46.05%	['monster_fuzzer', 'parser_fuzzer', 'scalar_fuzzer']
flatbuffers::Parser::CheckPrivateLeak()	40	2	5.0%	['monster_fuzzer', 'parser_fuzzer', 'scalar_fuzzer']
flatbuffers::JsonPrinter::PrintOffset(voidconst*,flatbuffers::Typeconst&,int,unsignedcharconst*,int)	59	30	50.84%	['monster_fuzzer', 'scalar_fuzzer']

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file	Reached by	Covered by
	[]	[]
/src/flatbuffers/tests/fuzzer/flexbuffers_verifier_fuzzer.cc	['flexverifier_fuzzer']	['flexverifier_fuzzer']
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/idl.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection.h	['annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/usr/local/bin/../include/c++/v1/sstream	[]	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/struct.h	['scalar_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../tests/64bit/test_64bit_generated.h	['64bit_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/base.h	['flexverifier_fuzzer', 'verifier_fuzzer', '64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/src/util.cpp	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']
/usr/local/bin/../include/c++/v1/__exception/exception.h	[]	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/array.h	['scalar_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector.h	['verifier_fuzzer', '64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/usr/local/bin/../include/c++/v1/stdexcept	[]	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/code_generator.h	[]	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/buffer.h	['verifier_fuzzer', '64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flatbuffer_builder.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/flatbuffers_verifier_fuzzer.cc	['verifier_fuzzer']	['verifier_fuzzer']
/src/flatbuffers/tests/fuzzer/../../tests/test_assert.h	['64bit_fuzzer', 'scalar_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/src/binary_annotator.h	['annotator_fuzzer']	['annotator_fuzzer']
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/default_allocator.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/string.h	['64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/src/binary_annotator.cpp	['annotator_fuzzer']	['annotator_fuzzer']
/src/flatbuffers/tests/fuzzer/test_init.h	['scalar_fuzzer']	['scalar_fuzzer']
/src/flatbuffers/tests/fuzzer/flatbuffers_monster_fuzzer.cc	['monster_fuzzer']	['monster_fuzzer']
/usr/local/bin/../include/c++/v1/optional	['annotator_fuzzer', 'scalar_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/allocator.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/verifier.h	['verifier_fuzzer', '64bit_fuzzer', 'annotator_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/hash.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/flatbuffers_64bit_fuzzer.cc	['64bit_fuzzer']	['64bit_fuzzer']
/src/flatbuffers/src/idl_parser.cpp	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']
/src/flatbuffers/tests/fuzzer/../../tests/cpp17/generated_cpp17/monster_test_generated.h	['verifier_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../src/binary_annotator.h	['annotator_fuzzer']	['annotator_fuzzer']
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/table.h	['verifier_fuzzer', '64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/test_assert.cpp	['64bit_fuzzer', 'scalar_fuzzer', 'monster_fuzzer']	['64bit_fuzzer', 'scalar_fuzzer', 'monster_fuzzer']
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flexbuffers.h	['flexverifier_fuzzer', 'verifier_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/usr/local/bin/../include/c++/v1/string	[]	[]
/src/flatbuffers/src/idl_gen_text.cpp	['scalar_fuzzer', 'monster_fuzzer']	['scalar_fuzzer', 'monster_fuzzer']
/src/flatbuffers/tests/fuzzer/flatbuffers_scalar_fuzzer.cc	['scalar_fuzzer']	['scalar_fuzzer']
/src/flatbuffers/tests/fuzzer/flatbuffers_annotator_fuzzer.cc	['annotator_fuzzer']	['annotator_fuzzer']
/src/flatbuffers/tests/fuzzer/../../tests/64bit/test_64bit_bfbs_generated.h	[]	[]
/src/flatbuffers/tests/fuzzer/flatbuffers_parser_fuzzer.cc	['parser_fuzzer']	['parser_fuzzer']
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/reflection_generated.h	['annotator_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/util.h	['64bit_fuzzer', 'annotator_fuzzer', 'scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/flex_flat_util.h	['verifier_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/vector_downward.h	['scalar_fuzzer', 'parser_fuzzer', 'monster_fuzzer']	[]
/src/flatbuffers/src/reflection.cpp	['annotator_fuzzer']	['annotator_fuzzer']

Directories in report

Directory
/src/flatbuffers/tests/fuzzer/../../include/flatbuffers/
/src/flatbuffers/tests/fuzzer/../../src/
/usr/local/bin/../include/c++/v1/
/src/flatbuffers/src/
/usr/local/bin/../include/c++/v1/__exception/
/src/flatbuffers/tests/fuzzer/../../tests/
/src/flatbuffers/tests/fuzzer/
/src/flatbuffers/tests/fuzzer/../../tests/64bit/
/src/flatbuffers/tests/
/src/flatbuffers/tests/fuzzer/../../tests/cpp17/generated_cpp17/