High level conclusions

Fuzzers reach 64.27% code coverage.

Fuzzers reach 0.691% of cyclomatic complexity.

Fuzzers reach 1.030% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

33 / 3202

Cyclomatic complexity statically reachable by fuzzers

15 / 2168

Runtime code coverage of functions

2058 / 3202

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: translate

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	538	68.2%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	250	31.7%
All colors	788	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
155	256	FuzzSmithConfig::arbitrary	call site: 00256	FuzzInput::arbitrary
39	211	ModuleParser::process_types	call site: 00211	FuzzInput::arbitrary
36	128	Module::validate	call site: 00128	fuzz_target
21	650	ModuleParser::consume_buffer	call site: 00650	impl_try_truncate_into
19	690	ModuleParser::parse_buffered_unchecked	call site: 00690	StoreInner::try_resolve_memory
17	39	Config::default_features	call site: 00039	impl_try_truncate_into
16	2	FuzzModule::wasm	call site: 00002	impl_try_truncate_into
16	586	ModuleParser::process_exports	call site: 00586	impl_try_truncate_into
13	674	GuardedEntity::entity_index	call site: 00674	Module::validate
12	524	TableType::from_wasmparser	call site: 00524
11	455	ModuleParser::process_imports	call site: 00455	HeadVec::push
9	61	Engine::new	call site: 00061

Runtime coverage analysis

Covered functions

8422

Functions that are reachable but not covered

12

Reachable functions

45

Percentage of reachable functions covered

73.33%

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.

Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
fuzz/fuzz_targets/translate.rs	11
crates/fuzz/src/module.rs	3
crates/core/src/value.rs	6
crates/c_api/src/global.rs	13
crates/c_api/src/val.rs	6
crates/wasmi/src/engine/config.rs	2
crates/collections/src/string_interner.rs	8
crates/core/src/untyped.rs	1
crates/c_api/src/config.rs	46
crates/cli/src/args.rs	1
crates/core/src/fuel.rs	9
crates/c_api/src/trap.rs	1
crates/wasmi/src/error.rs	1
crates/c_api/src/module.rs	15
crates/c_api/src/engine.rs	2
crates/wasmi/src/module/parser/buffered.rs	36
crates/wasmi/src/engine/translator/func/utils.rs	1
crates/c_api/src/store.rs	2
fuzz/fuzz_targets/execute.rs	29
crates/core/src/table/element.rs	1
crates/c_api/macro/lib.rs	8
crates/collections/src/set.rs	7
crates/core/src/limiter.rs	2
crates/wasmi/src/module/parser/mod.rs	67
fuzz/fuzz_targets/differential.rs	7
crates/core/src/memory/access.rs	5
crates/fuzz/src/value.rs	7
crates/fuzz/src/config.rs	3
crates/fuzz/src/oracle/wasmi_stack.rs	6
crates/c_api/src/func.rs	4
crates/wasmi/src/module/utils.rs	10
crates/wasmi/src/module/builder.rs	12
crates/wasmi/src/engine/mod.rs	3
crates/collections/src/head_vec.rs	2
crates/core/src/table/ty.rs	1
crates/c_api/src/vec.rs	2
crates/c_api/src/memory.rs	3
crates/core/src/memory/mod.rs	3
crates/wasmi/src/func/caller.rs	1
crates/wasmi/src/store/inner.rs	6
crates/collections/src/arena/guarded.rs	2
crates/wasmi/src/store/error.rs	1
crates/ir/src/span.rs	2
crates/collections/src/hash.rs	1
crates/wasmi/src/engine/code_map.rs	3
crates/core/src/memory/ty.rs	1

Fuzzer: execute

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	912	73.1%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	334	26.8%
All colors	1246	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
93	807	Module::func_types_cloned	call site: 00807	impl_try_truncate_into
86	909	LinkerError::missing_definition	call site: 00909	fuzz_target
64	1064	StoreInner::try_resolve_memory_mut	call site: 01064	wasm_val_t::from
53	329	FuzzSmithConfig::allow_execution	call site: 00329	FuzzInput::arbitrary
45	1200	ModuleParser::parse_buffered_data	call site: 01200	Linker::instantiate_and_start
39	766	ModuleParser::parse_buffered_unchecked	call site: 00766	Linker::instantiate_and_start
30	1024	ResourceLimiterRef::as_resource_limiter	call site: 01024	SmallByteSlice::as_slice
24	116	StoreLimitsBuilder::new	call site: 00116	fuzz_target
21	742	GuardedEntity::entity_index	call site: 00742	Module::validate
17	462	Error::from	call site: 00462	Error::from
16	216	ResourceLimiterRef::as_resource_limiter	call site: 00216	impl_try_truncate_into
16	654	ModuleParser::process_exports	call site: 00654	impl_try_truncate_into

Runtime coverage analysis

Covered functions

11579

Functions that are reachable but not covered

26

Reachable functions

98

Percentage of reachable functions covered

73.47%

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.

Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
fuzz/fuzz_targets/execute.rs	50
crates/fuzz/src/module.rs	3
crates/core/src/value.rs	6
crates/c_api/src/global.rs	20
crates/c_api/src/val.rs	7
crates/wasmi/src/engine/config.rs	2
crates/collections/src/string_interner.rs	8
crates/core/src/untyped.rs	1
crates/c_api/src/config.rs	84
crates/cli/src/args.rs	1
crates/core/src/fuel.rs	9
crates/c_api/src/trap.rs	1
crates/wasmi/src/error.rs	1
crates/c_api/src/memory.rs	6
crates/c_api/src/store.rs	5
crates/core/src/memory/ty.rs	5
crates/c_api/src/engine.rs	2
crates/core/src/limiter.rs	2
crates/c_api/src/error.rs	3
crates/c_api/src/module.rs	28
crates/wasmi/src/module/parser/buffered.rs	36
crates/wasmi/src/engine/translator/func/utils.rs	1
crates/wasmi/src/engine/code_map.rs	3
crates/core/src/table/element.rs	1
crates/c_api/macro/lib.rs	8
crates/collections/src/set.rs	7
crates/wasmi/src/module/parser/mod.rs	67
fuzz/fuzz_targets/differential.rs	5
crates/core/src/memory/access.rs	5
crates/fuzz/src/value.rs	7
crates/fuzz/src/config.rs	3
crates/fuzz/src/oracle/wasmi_stack.rs	6
crates/c_api/src/func.rs	30
crates/wasmi/src/module/utils.rs	10
crates/wasmi/src/module/builder.rs	12
crates/wasmi/src/engine/mod.rs	3
crates/collections/src/head_vec.rs	2
crates/core/src/table/ty.rs	1
crates/c_api/src/vec.rs	2
crates/core/src/memory/mod.rs	6
crates/wasmi/src/func/caller.rs	2
crates/wasmi/src/store/inner.rs	10
crates/collections/src/arena/guarded.rs	2
crates/wasmi/src/store/error.rs	1
crates/ir/src/span.rs	2
crates/wasmi/src/linker.rs	27
crates/wasmi/src/module/mod.rs	2
crates/c_api/src/types/global.rs	1
crates/c_api/src/types/table.rs	1
crates/wasmi/tests/integration/resource_limiter.rs	3
crates/c_api/src/instance.rs	9
crates/c_api/src/ref.rs	3
crates/collections/src/map.rs	2
crates/c_api/src/utils.rs	1
crates/collections/src/hash.rs	1

Fuzzer: differential

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	850	69.3%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	375	30.6%
All colors	1225	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
90	1067	Module::func_types_cloned	call site: 01067	impl_try_truncate_into
61	421	StoreInner::try_resolve_memory_mut	call site: 00421	wasm_val_t::from
51	1162	LinkerError::missing_definition	call site: 01162	impl_try_truncate_into
40	1025	ModuleParser::parse_buffered_impl	call site: 01025	Linker::instantiate_and_start
30	373	ResourceLimiterRef::as_resource_limiter	call site: 00373	SmallByteSlice::as_slice
28	683	FuzzState::init_params	call site: 00683	Error::from
17	155	WasmSource::into_bytes	call site: 00155	wasm_global_t::try_from
17	940	ModuleParser::consume_buffer	call site: 00940	ModuleParser::process_invalid_payload
16	876	ModuleParser::process_exports	call site: 00876	impl_try_truncate_into
15	133	FuzzState::run	call site: 00133	fuzz_target
15	174	ResourceLimiterRef::as_resource_limiter	call site: 00174	impl_try_truncate_into
15	356	SmallByteSlice::as_slice	call site: 00356	ResourceLimiterRef::as_resource_limiter

Runtime coverage analysis

Covered functions

12882

Functions that are reachable but not covered

10

Reachable functions

71

Percentage of reachable functions covered

85.92%

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.

Warning: The number of covered functions are larger than the number of reachable functions. This means that there are more functions covered at runtime than are extracted using static analysis. This is likely a result of the static analysis component failing to extract the right call graph or the coverage runtime being compiled with sanitizers in code that the static analysis has not analysed. This can happen if lto/gold is not used in all places that coverage instrumentation is used.

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
fuzz/fuzz_targets/differential.rs	49
crates/fuzz/src/module.rs	3
crates/core/src/value.rs	7
crates/c_api/src/val.rs	7
crates/wasmi/src/engine/config.rs	6
crates/collections/src/string_interner.rs	8
crates/core/src/untyped.rs	1
crates/c_api/src/config.rs	84
crates/c_api/src/trap.rs	1
crates/wasmi/src/error.rs	1
crates/c_api/src/memory.rs	6
crates/c_api/src/store.rs	3
fuzz/fuzz_targets/execute.rs	21
crates/c_api/src/instance.rs	9
crates/wasmi/src/func/caller.rs	2
crates/cli/src/context.rs	6
crates/c_api/src/vec.rs	2
crates/c_api/macro/lib.rs	8
crates/c_api/src/global.rs	24
crates/collections/src/set.rs	7
crates/core/src/limiter.rs	2
crates/core/src/memory/access.rs	5
crates/fuzz/src/value.rs	7
crates/fuzz/src/config.rs	3
crates/fuzz/src/oracle/wasmi_stack.rs	12
crates/c_api/src/func.rs	30
crates/wasmi/src/engine/code_map.rs	3
crates/c_api/src/ref.rs	3
crates/collections/src/map.rs	2
crates/wasmi/src/module/mod.rs	2
crates/c_api/src/utils.rs	1
crates/core/src/memory/mod.rs	6
crates/wasmi/src/store/inner.rs	10
crates/collections/src/arena/guarded.rs	2
crates/wasmi/src/store/error.rs	1
crates/fuzz/src/oracle/exports.rs	1
crates/core/src/simd.rs	1
crates/wasmi/src/limits.rs	1
crates/core/src/memory/ty.rs	5
crates/c_api/src/engine.rs	2
crates/core/src/table/element.rs	1
crates/wasmi/src/module/parser/buffered.rs	36
crates/wasmi/src/engine/translator/func/utils.rs	1
crates/wasmi/src/module/parser/mod.rs	67
crates/wasmi/src/module/utils.rs	10
crates/wasmi/src/module/builder.rs	12
crates/wasmi/src/engine/mod.rs	3
crates/collections/src/head_vec.rs	2
crates/core/src/table/ty.rs	1
crates/collections/src/hash.rs	1
crates/wasmi/src/linker.rs	27
crates/c_api/src/module.rs	13
crates/c_api/src/types/global.rs	1
crates/c_api/src/types/table.rs	1
crates/wasmi/tests/integration/resource_limiter.rs	3

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

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

Functions statically reachable by fuzzers

33 / 3202

Cyclomatic complexity statically reachable by fuzzers

15 / 2168

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.

fuzz/fuzz_targets/translate.rs

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=['FuzzSmithConfig::arbitrary', 'ModuleParser::process_types', 'Module::validate', 'ModuleParser::consume_buffer', 'ModuleParser::parse_buffered_unchecked', 'Config::default_features', 'FuzzModule::wasm', 'ModuleParser::process_exports', 'GuardedEntity::entity_index', 'TableType::from_wasmparser']

fuzz/fuzz_targets/execute.rs

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=['Module::func_types_cloned', 'LinkerError::missing_definition', 'StoreInner::try_resolve_memory_mut', 'FuzzSmithConfig::allow_execution', 'ModuleParser::parse_buffered_data', 'ModuleParser::parse_buffered_unchecked', 'ResourceLimiterRef::as_resource_limiter', 'StoreLimitsBuilder::new', 'GuardedEntity::entity_index', 'Error::from']

fuzz/fuzz_targets/differential.rs

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=['Module::func_types_cloned', 'StoreInner::try_resolve_memory_mut', 'LinkerError::missing_definition', 'ModuleParser::parse_buffered_impl', 'ResourceLimiterRef::as_resource_limiter', 'FuzzState::init_params', 'WasmSource::into_bytes', 'ModuleParser::consume_buffer', 'ModuleParser::process_exports', 'FuzzState::run']

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
wasmi_ir::op::Op as wasmi::engine::translator::comparator::TryIntoCmpSelectInstr::try_into_cmp_select_instr::wasmi::engine::translator::func::FuncTranslator::try_fuse_select::{closure:#0}	106	48	45.28%
wasmi_ir::op::Op as wasmi::engine::translator::comparator::CompareResult::compare_result	97	39	40.20%
wasmi_ir::op::Op::result_ref	600	266	44.33%
wasmi::linker::Linkerwasmi::limits::StoreLimits::process_import::&mut &mut wasmi::store::Storewasmi::limits::StoreLimits	40	12	30.0%
wasmi::module::Module::extract_imports::alloc::vec::Vecwasmi::instance::exports::Extern, &&mut wasmi::store::Storewasmi::limits::StoreLimits	62	15	24.19%
differential::FuzzState::assert_memories_match	32	7	21.87%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::is_available::&cranelift_codegen::isa::x64::inst::EmitInfo	1074	342	31.84%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::visit::cranelift_codegen::isa::x64::inst::external::RegallocVisitorcranelift_codegen::machinst::reg::OperandCollectorcranelift_codegen::machinst::vcode::VCodeBuildercranelift_codegen::isa::x64::lower::isle::generated_code::MInst::collect_operands::{closure:#0}	1074	308	28.67%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::visit::cranelift_codegen::isa::x64::inst::external::RegallocVisitorcranelift_codegen::machinst::vcode::VCodecranelift_codegen::isa::x64::lower::isle::generated_code::MInst::emit::{closure:#3}	1074	308	28.67%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::encode::cranelift_codegen::isa::x64::inst::external::AsmCodeSink	1074	353	32.86%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_cmove::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	155	33	21.29%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_lower::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	8064	4171	51.72%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_sar::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	57	26	45.61%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_shl::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	57	28	49.12%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_shr::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	57	28	49.12%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_load::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	48	22	45.83%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_rotl::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	59	24	40.67%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_rotr::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	57	22	38.59%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_emit_fcmp::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	180	76	42.22%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_round::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	95	28	29.47%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_with_flags::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	82	31	37.80%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_pcmpgt::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	48	18	37.5%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_add_raw::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	66	29	43.93%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_sub_mem::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	91	14	15.38%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_x64_xor_mem::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	97	49	50.51%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_f32x4_insertlane::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	33	13	39.39%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_lower_i64x2_sshr_imm::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	48	26	54.16%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_all_ones_or_all_zeros::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	69	27	39.13%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_with_flags_side_effect::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	51	15	29.41%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_consumes_flags_return_last::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	38	19	50.0%

New fuzzers

The below fuzzers are templates and suggestions for how to target the set of optimal functions above

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/wasmi/crates/wasmi/src/table/element.rs	[]	[]
/src/wasmi/crates/cli/src/main.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/instantitation.rs	[]	[]
/src/wasmi/crates/c_api/src/frame.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/limits/engine.rs	[]	[]
/src/wasmi/crates/core/src/memory/tests.rs	[]	[]
/src/wasmi/crates/c_api/src/utils.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/core/src/hint.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/utils.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/driver.rs	[]	[]
/src/wasmi/crates/c_api/src/module.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/store/typeid.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/export.rs	[]	[]
/src/wasmi/crates/wasmi/src/global.rs	[]	[]
/src/wasmi/crates/fuzz/src/error.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/resumable.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/mod.rs	[]	[]
/src/wasmi/crates/core/src/memory/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/host_call_instantiation.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/dispatch/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/instance.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/c_api/src/trap.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/cli/src/display.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/mod.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/wasmi_stack.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/table/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/extern.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/exports.rs	[]	[]
/src/wasmi/crates/ir/src/op.rs	[]	[]
/src/wasmi/crates/wasmi/src/memory/data.rs	[]	[]
/src/wasmi/crates/wasmi/benches/benches.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/mod.rs	[]	[]
/src/wasmi/crates/cli/src/context.rs	['differential']	['differential']
/src/wasmi/crates/wasmi/src/linker.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/core/src/untyped.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/func.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/index_ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/mod.rs	[]	[]
/src/wasmi/crates/collections/src/tests.rs	[]	[]
/src/wasmi/crates/ir/src/encode.rs	[]	[]
/src/wasmi/crates/wasmi/src/value.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/error.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/data.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/labels.rs	[]	[]
/src/wasmi/crates/core/src/typed.rs	[]	[]
/src/wasmi/crates/fuzz/src/module.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/func/error.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/builder.rs	[]	[]
/src/wasmi/crates/c_api/src/types/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/error.rs	['execute']	['execute']
/src/wasmi/crates/wasmi/src/engine/translator/func/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/instantiate/error.rs	[]	[]
/src/wasmi/crates/c_api/src/types/import.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/global.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/pruned.rs	[]	[]
/src/wasmi/crates/c_api/src/val.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/float.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/locals.rs	[]	[]
/src/wasmi/crates/core/src/table/ty.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/fuzz/src/oracle/wasmtime.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/func_inout.rs	[]	[]
/src/wasmi/crates/ir/src/opcode.rs	[]	[]
/src/wasmi/crates/core/src/global.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/encoder.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/resource_limiter.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/core/src/func_type.rs	[]	[]
/src/wasmi/crates/core/src/memory/access.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/memory/ty.rs	[]	[]
/src/wasmi/crates/collections/src/arena/dedup.rs	[]	[]
/src/wasmi/crates/c_api/src/engine.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/wasmi/src/func/typed_func.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/op.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/import.rs	[]	[]
/src/wasmi/crates/cli/src/tests.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/wasmi.rs	[]	[]
/src/wasmi/crates/ir/src/decode/op.rs	[]	[]
/src/wasmi/crates/wasmi/src/memory/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/into_func.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/operands.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/limits/stack.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/exec/simd.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/instantiate/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/operand.rs	[]	[]
/src/wasmi/crates/core/src/wasm.rs	[]	[]
/src/wasmi/crates/ir/src/index.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/element.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/exec.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/ty.rs	[]	[]
/src/wasmi/crates/ir/src/decode/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/foreign.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/utils.rs	[]	[]
/src/wasmi/crates/core/src/table/tests.rs	[]	[]
/src/wasmi/crates/wasi/tests/wasi_wat.rs	[]	[]
/src/wasmi/crates/core/src/table/element.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/host_calls_wasm.rs	[]	[]
/src/wasmi/crates/c_api/src/types/func.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/mod.rs	[]	[]
/src/wasmi/crates/wasi/src/guest_memory.rs	[]	[]
/src/wasmi/crates/c_api/src/types/memory.rs	[]	[]
/src/wasmi/crates/wasmi/src/tests.rs	[]	[]
/src/wasmi/crates/core/src/table/error.rs	[]	[]
/src/wasmi/crates/core/src/memory/ty.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/trap.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/visit.rs	[]	[]
/src/wasmi/crates/wasmi/src/reftype.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/layout.rs	[]	[]
/src/wasmi/crates/core/src/memory/buffer.rs	[]	[]
/src/wasmi/crates/wasmi/src/foreach_tuple.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/builder.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasi/src/sync/snapshots/preview_1.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/host_call_error.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/func.rs	[]	[]
/src/wasmi/crates/core/src/memory/error.rs	[]	[]
/src/wasmi/crates/cli/tests/run.rs	[]	[]
/src/wasmi/crates/c_api/src/types/extern.rs	[]	[]
/src/wasmi/crates/collections/src/set.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/value.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/custom_section.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/limits/tests.rs	[]	[]
/src/wasmi/crates/wasmi/benches/bench/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/store.rs	['translate', 'execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/utils.rs	[]	[]
/src/wasmi/crates/c_api/src/vec.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/c_api/src/global.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/types/table.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/c_api/src/types/val.rs	[]	[]
/src/wasmi/crates/collections/src/map.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/traits.rs	[]	[]
/src/wasmi/crates/collections/src/arena/component_vec.rs	[]	[]
/src/wasmi/crates/c_api/src/types/global.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/executor/handler/dispatch/backend/loop.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/locals.rs	[]	[]
/src/wasmi/crates/fuzz/src/value.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wast/src/lib.rs	[]	[]
/src/wasmi/crates/collections/src/string_interner/detail.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/call_hook.rs	[]	[]
/src/wasmi/crates/collections/src/arena/guarded.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/block_type.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/read.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/exec/macros.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/code_map.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/cli/src/args.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/src/table/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/parser/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/fuel_consumption.rs	[]	[]
/src/wasmi/crates/fuzz/src/config.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/fuzz/src/oracle/wasmi_v049.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/fuel_metering.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/init_expr.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/utils.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/limiter.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wast/tests/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/control.rs	[]	[]
/src/wasmi/crates/c_api/src/table.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/func_types.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/dispatch/backend/tail.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/instantiate/tests.rs	[]	[]
/src/wasmi/crates/collections/src/head_vec.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/resumable_call.rs	[]	[]
/src/wasmi/crates/wasmi/src/error.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/cli/src/utils.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/func.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/config.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/ir/build.rs	[]	[]
/src/wasmi/crates/fuzz/src/crash_inputs.rs	[]	[]
/src/wasmi/crates/core/src/simd.rs	['differential']	['differential']
/src/wasmi/crates/ir/src/primitive.rs	[]	[]
/src/wasmi/crates/core/src/host_error.rs	[]	[]
/src/wasmi/crates/core/src/fuel.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/src/func/caller.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/config.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/wasmi/src/engine/executor/handler/eval.rs	[]	[]
/src/wasmi/fuzz/fuzz_targets/translate.rs	['translate']	[]
/src/wasmi/crates/collections/src/hash.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/executor/handler/utils.rs	[]	[]
/src/wasmi/crates/wasmi/src/limits.rs	['differential']	['differential']
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/visit.rs	[]	[]
/src/wasmi/crates/c_api/macro/lib.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/ir/src/span.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/src/engine/executor/handler/state.rs	[]	[]
/src/wasmi/fuzz/fuzz_targets/differential.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/ref.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/collections/src/string_interner.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/error.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/comparator.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/context.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/mod.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/fuzz/src/oracle/exports.rs	['differential']	['differential']
/src/wasmi/crates/wasmi/src/engine/translator/func/op.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/parser/buffered.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/table/ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/inner.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/types/export.rs	[]	[]
/src/wasmi/crates/c_api/src/memory.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/call_host_via_engine.rs	[]	[]
/src/wasmi/crates/collections/src/arena/mod.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/host_call_compilation.rs	[]	[]
/src/wasmi/fuzz/fuzz_targets/execute.rs	['translate', 'execute', 'differential']	['execute']

Directories in report

Directory
/src/wasmi/crates/cli/src/
/src/wasmi/crates/wasmi/src/engine/executor/handler/dispatch/backend/
/src/wasmi/crates/c_api/src/
/src/wasmi/crates/wasmi/src/engine/executor/
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/
/src/wasmi/crates/core/src/memory/
/src/wasmi/crates/wasmi/src/engine/translator/func/
/src/wasmi/crates/core/src/table/
/src/wasmi/crates/wasmi/benches/
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/
/src/wasmi/crates/wasmi/src/engine/executor/handler/exec/
/src/wasmi/crates/wasmi/src/engine/executor/handler/
/src/wasmi/crates/wasi/tests/
/src/wasmi/crates/collections/src/string_interner/
/src/wasmi/crates/collections/src/
/src/wasmi/crates/wasmi/src/module/
/src/wasmi/crates/wasmi/src/store/
/src/wasmi/crates/cli/tests/
/src/wasmi/crates/wasmi/src/engine/limits/
/src/wasmi/crates/wasmi/src/table/
/src/wasmi/crates/wasmi/src/instance/
/src/wasmi/crates/wasi/src/sync/snapshots/
/src/wasmi/crates/wasi/src/
/src/wasmi/crates/wasmi/src/
/src/wasmi/crates/ir/
/src/wasmi/crates/collections/src/arena/
/src/wasmi/crates/wasmi/src/engine/
/src/wasmi/crates/wasmi/src/module/instantiate/
/src/wasmi/crates/wasmi/tests/integration/
/src/wasmi/crates/ir/src/
/src/wasmi/crates/fuzz/src/
/src/wasmi/crates/wasmi/src/memory/
/src/wasmi/crates/wast/src/
/src/wasmi/crates/wasmi/src/module/parser/
/src/wasmi/crates/wasmi/benches/bench/
/src/wasmi/crates/core/src/
/src/wasmi/crates/wasmi/src/engine/translator/
/src/wasmi/crates/wasmi/src/func/
/src/wasmi/crates/wast/tests/
/src/wasmi/crates/c_api/src/types/
/src/wasmi/crates/wasmi/src/engine/executor/handler/dispatch/
/src/wasmi/crates/c_api/macro/
/src/wasmi/crates/fuzz/src/oracle/
/src/wasmi/crates/ir/src/decode/
/src/wasmi/fuzz/fuzz_targets/

This section shows a list of 3rd party function calls and their relative coverage information. By static analysis of the target project code, all of the 3rd party function call and their caller information, including the source file and line number that initiate the call are captured. The caller source code file and line number are shown in column 2 while column 1 is the function name of the 3rd party function call. Each occurrent of the 3rd party function call will occuply a separate row. Column 3 of each row indicate if the 3rd party call in the source file line is unreachable. Column 4 lists all fuzzers that have covered that particular system call in that specific location (source file and line)during their dynamic fuzzing.

Function in each files in report

Target sink	Callsite location	Reached by fuzzer	Covered by Fuzzers