Report generation date: 2025-06-13

Project overview: spirv-cross

High level conclusions

Fuzzers reach 81.18% code coverage.

Fuzzers reach 71.14% of cyclomatic complexity.

Fuzzers reach 67.11% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

553 / 824

Cyclomatic complexity statically reachable by fuzzers

2083 / 2928

Runtime code coverage of functions

669 / 824

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.

Fuzzers overview

Fuzzer	Fuzzer filename	Functions Reached	Functions unreached	Fuzzer depth	Files reached	Basic blocks reached	Cyclomatic complexity	Details
parser_fuzzer	/src/parser_fuzzer.cpp	1117	281	11	8	4393	2121	parser_fuzzer.cpp

Project functions overview

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	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzzer details

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

Full calltree

Call tree overview bitmap:

The distribution of callsites in terms of coloring is

Color Runtime hitcount Callsite count Percentage

red 0 386 29.2%

gold [1:9] 98 7.41%

yellow [10:29] 56 4.23%

greenyellow [30:49] 4 0.30%

lawngreen 50+ 777 58.8%

All colors 1321 100

Color	Runtime hitcount	Callsite count	Percentage
red	0	386	29.2%
gold	[1:9]	98	7.41%
yellow	[10:29]	56	4.23%
greenyellow	[30:49]	4	0.30%
lawngreen	50+	777	58.8%
All colors	1321	100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity	Unique Reachable Complexities	Unique Reachable Functions	All non-covered Complexity	All Reachable Complexity	Function Name	Function Callsite	Blocked Branch
6	10	4 : View List ['__cxa_throw', '__cxa_free_exception', '__cxa_allocate_exception', 'spirv_cross::CompilerError::CompilerError(char const*)']	6	16	spirv_cross::ParsedIR::add_typed_id(spirv_cross::Types,spirv_cross::TypedID<(spirv_cross::Types)0>)	call site: 00000	/src/spirv-cross/spirv_cross_parsed_ir.cpp:936
6	10	4 : View List ['__cxa_throw', '__cxa_free_exception', '__cxa_allocate_exception', 'spirv_cross::CompilerError::CompilerError(char const*)']	6	10	spirv_cross::SPIRTypeconst&spirv_cross::Variant::get ()const	call site: 00000	/src/spirv-cross/spirv_common.hpp:1563
6	10	4 : View List ['__cxa_throw', '__cxa_free_exception', '__cxa_allocate_exception', 'spirv_cross::CompilerError::CompilerError(char const*)']	6	10	spirv_cross::Parser::stream(spirv_cross::Instructionconst&)const	call site: 00000	/src/spirv-cross/spirv_parser.cpp:156
6	10	4 : View List ['__cxa_throw', '__cxa_free_exception', '__cxa_allocate_exception', 'spirv_cross::CompilerError::CompilerError(char const*)']	6	10	spirv_cross::Parser::parse(spirv_cross::Instructionconst&)	call site: 00000	/src/spirv-cross/spirv_parser.cpp:261
6	6	1 : View List ['spirv_cross::Meta::Decoration::~Decoration()']	6	6	spirv_cross::SmallVector ::resize(unsignedlong)	call site: 00000	/src/spirv-cross/spirv_cross_containers.hpp:513
2	4	3 : View List ['spirv_cross::VectorView >::end()', 'spirv_cross::TypedID<(spirv_cross::Types)0>* std::__1::move[abi:ne180100] , spirv_cross::TypedID<(spirv_cross::Types)0>>(spirv_cross::TypedID<(spirv_cross::Types)0>, spirv_cross::TypedID<(spirv_cross::Types)0>, spirv_cross::TypedID<(spirv_cross::Types)0>*)', '__clang_call_terminate']	2	26	spirv_cross::SmallVector ,8ul>::erase(spirv_cross::TypedID<(spirv_cross::Types)0>,spirv_cross::TypedID<(spirv_cross::Types)0>)	call site: 00000	/src/spirv-cross/spirv_cross_containers.hpp:499
2	2	2 : View List ['std::__1::unique_ptr >::operator->[abi:ne180100]() const', '__clang_call_terminate']	2	2	spirv_cross::Variant::operator=(spirv_cross::Variant&&)	call site: 00000	/src/spirv-cross/spirv_common.hpp:1484
0	42	5 : View List ['spirv_cross::SmallVector ::push_back(spirv_cross::SPIRConstant&&)', 'malloc', 'void spirv_cross::SmallVector ::MallocDeleter>, 8ul>::emplace_back (spirv_cross::SPIRConstant&)', 'spirv_cross::SmallVector ::reserve(unsigned long)', 'spirv_cross::VectorView ::MallocDeleter> >::size() const']	0	127	spirv_cross::SPIRConstantspirv_cross::ObjectPool ::allocate (unsignedint&,unsignedintconst&&,unsignedint&&,bool&&)	call site: 00000	/src/spirv-cross/spirv_cross_containers.hpp:572
0	29	1 : View List ['spirv_cross::SPIRConstantOp& spirv_cross::Parser::get (unsigned int)']	0	29	spirv_cross::SPIRConstantOp*spirv_cross::Parser::maybe_get (unsignedint)	call site: 00000	/src/spirv-cross/spirv_parser.hpp:73
0	29	1 : View List ['spirv_cross::SPIRUndef& spirv_cross::Parser::get (unsigned int)']	0	29	spirv_cross::SPIRUndef*spirv_cross::Parser::maybe_get (unsignedint)	call site: 00000	/src/spirv-cross/spirv_parser.hpp:73
0	16	2 : View List ['spirv_cross::TypedID<(spirv_cross::Types)0>::TypedID()', 'spirv_cross::SmallVector , 8ul>::reserve(unsigned long)']	0	16	spirv_cross::SmallVector ,8ul>::resize(unsignedlong)	call site: 00000	/src/spirv-cross/spirv_cross_containers.hpp:513
0	16	1 : View List ['spirv_cross::SmallVector ::push_back(spirv_cross::Instruction const&)']	0	16	spirv_cross::Parser::parse(spirv_cross::Instructionconst&)	call site: 00000	/src/spirv-cross/spirv_parser.cpp:1268

Runtime coverage analysis

Covered functions

635

Functions that are reachable but not covered

60

Reachable functions

1117

Percentage of reachable functions covered

94.63%

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/parser_fuzzer.cpp	1
/src/spirv-cross/spirv_parser.cpp	11
/src/spirv-cross/spirv_cross_parsed_ir.cpp	23
/src/spirv-cross/spirv_cross_containers.hpp	363
/src/spirv-cross/spirv_common.hpp	120
/src/spirv-cross/spirv_cross_parsed_ir.hpp	5
/src/spirv-cross/spirv_parser.hpp	29
/src/spirv-cross/spirv_cross_error_handling.hpp	2

Analyses and suggestions

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	instr count	bb count	cyclomatic complexity	Reachable functions	total cyclomatic complexity	Unreached complexity
`spirv_cross::Parser::variable_storage_is_aliased(spirv_cross::SPIRVariableconst&)const`	/src/spirv-cross/spirv_parser.cpp	2	['N/A', 'N/A']	6	164	23	6	64	140	87
`spirv_cross::SPIRFunction::clone(spirv_cross::ObjectPoolBase*)`	/src/spirv-cross/spirv_common.hpp	2	['N/A', 'N/A']	7	20	3	2	114	191	66
`spirv_cross::ParsedIR::fixup_reserved_names()`	/src/spirv-cross/spirv_cross_parsed_ir.cpp	1	['N/A']	6	123	16	6	45	99	43
`spirv_cross::Meta::Meta(spirv_cross::Metaconst&)`	/src/spirv-cross/spirv_common.hpp	2	['N/A', 'N/A']	6	55	6	6	36	70	42
`spirv_cross::SPIRBlock::clone(spirv_cross::ObjectPoolBase*)`	/src/spirv-cross/spirv_common.hpp	2	['N/A', 'N/A']	7	20	3	2	114	192	41
`spirv_cross::ParsedIR::ParsedIR(spirv_cross::ParsedIR&&)`	/src/spirv-cross/spirv_cross_parsed_ir.cpp	2	['N/A', 'N/A']	7	85	8	9	76	155	38

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

Functions statically reachable by fuzzers

625 / 824

Cyclomatic complexity statically reachable by fuzzers

2400 / 2928

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	Fuzzers runtime hit	Func lines hit %	I Count	BB Count	Cyclomatic complexity	Functions reached	Reached by functions	Accumulated cyclomatic complexity	Undiscovered complexity

Fuzz engine guidance

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/parser_fuzzer.cpp

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=['spirv_cross::Parser::parse(spirv_cross::Instruction const&)', 'spirv_cross::SPIRConstantOp& spirv_cross::variant_get(spirv_cross::Variant&)', 'spirv_cross::ParsedIR::add_typed_id(spirv_cross::Types, spirv_cross::TypedID<(spirv_cross::Types)0>)', 'spirv_cross::SPIRBlock* spirv_cross::ObjectPool::allocate<>()', 'spirv_cross::Parser::parse(spirv_cross::Instruction const&)', 'spirv_cross::SPIRType const& spirv_cross::variant_get(spirv_cross::Variant const&)', 'spirv_cross::Parser::parse(spirv_cross::Instruction const&)', 'spirv_cross::Parser::parse(spirv_cross::Instruction const&)', 'spirv_cross::SmallVector, 8ul>::~SmallVector()', 'spirv_cross::SPIRConstant* spirv_cross::ObjectPool::allocate(unsigned int const&, unsigned long&&, bool&&)']

Runtime coverage analysis

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
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']
spirv_cross::SmallVector ::MallocDeleter>,8ul>::reserve(unsignedlong)	32	5	15.62%	['parser_fuzzer']

Files and Directories in report

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/spirv-cross/spirv_parser.hpp	['parser_fuzzer']	['parser_fuzzer']
/src/spirv-cross/spirv_cross_error_handling.hpp	['parser_fuzzer']	['parser_fuzzer']
/src/spirv-cross/spirv_cross_parsed_ir.hpp	['parser_fuzzer']	['parser_fuzzer']
/usr/local/bin/../include/c++/v1/stdexcept	[]	[]
/src/parser_fuzzer.cpp	['parser_fuzzer']	['parser_fuzzer']
/src/spirv-cross/spirv_common.hpp	['parser_fuzzer']	['parser_fuzzer']
/src/spirv-cross/spirv_cross_containers.hpp	['parser_fuzzer']	['parser_fuzzer']
/src/spirv-cross/spirv_parser.cpp	['parser_fuzzer']	['parser_fuzzer']
/usr/local/bin/../include/c++/v1/string	[]	[]
/src/spirv-cross/spirv_cross_parsed_ir.cpp	['parser_fuzzer']	['parser_fuzzer']

Directories in report

Directory

/usr/local/bin/../include/c++/v1/
/src/spirv-cross/
/src/

Metadata section

This sections shows the raw data that is used to produce this report. This is mainly used for further processing and developer debugging.

Fuzzer Calltree file Program data file Coverage file

parser_fuzzer fuzzerLogFile-0-q9dOhJFXsh.data fuzzerLogFile-0-q9dOhJFXsh.data.yaml parser_fuzzer.covreport

Table of contents

Project overview: spirv-cross

High level conclusions

Reachability and coverage overview

Fuzzers overview

Project functions overview

Fuzzer details

Fuzzer: parser_fuzzer

Call tree

Fuzz blockers

Runtime coverage analysis

Files reached

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

All functions overview

Fuzz engine guidance

/src/parser_fuzzer.cpp

Dictionary

Fuzzer function priority

Runtime coverage analysis

Complex functions with low coverage

Files and Directories in report

Files in report

Directories in report

Metadata section