High level conclusions

Fuzzers reach 63.32% code coverage.

Fuzzers reach 0.609% of cyclomatic complexity.

Fuzzers reach 0.977% of all functions.

Reachability and coverage overview

Functions statically reachable by fuzzers

33 / 3376

Cyclomatic complexity statically reachable by fuzzers

15 / 2463

Runtime code coverage of functions

2138 / 3376

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	499	66.5%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	251	33.4%
All colors	750	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
131	260	FuzzSmithConfig::arbitrary	call site: 00260	FuzzInput::arbitrary
38	211	ModuleParser::process_types	call site: 00211	FuzzInput::arbitrary
36	128	Module::validate	call site: 00128	fuzz_target
21	619	ModuleParser::consume_buffer	call site: 00619	impl_try_truncate_into
17	39	Config::default_features	call site: 00039	impl_try_truncate_into
16	2	FuzzModule::wasm	call site: 00002	impl_try_truncate_into
16	555	ModuleParser::process_exports	call site: 00555	impl_try_truncate_into
16	656	ModuleParser::parse_buffered_unchecked	call site: 00656	ModuleParser::next_payload
11	435	ModuleParser::process_imports	call site: 00435	HeadVec::push
10	643	GuardedEntity::entity_index	call site: 00643	Module::validate
9	61	Engine::new	call site: 00061
8	735	ModuleParser::parse_buffered_impl	call site: 00735	Module::new_unchecked

Runtime coverage analysis

Covered functions

7993

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	12
crates/c_api/src/val.rs	6
crates/wasmi/src/engine/config.rs	2
crates/collections/src/string_interner.rs	5
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	66
fuzz/fuzz_targets/differential.rs	8
crates/core/src/memory/access.rs	5
crates/fuzz/src/value.rs	7
crates/fuzz/src/oracle/wasmi_stack.rs	6
crates/fuzz/src/config.rs	1
crates/c_api/src/func.rs	6
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	4
crates/collections/src/arena/guarded.rs	2
crates/ir2/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	873	72.2%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	335	27.7%
All colors	1208	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	772	Module::func_types_cloned	call site: 00772	impl_try_truncate_into
86	874	LinkerError::missing_definition	call site: 00874	fuzz_target
52	327	FuzzSmithConfig::arbitrary	call site: 00327	FuzzInput::arbitrary
45	1162	ModuleParser::parse_buffered_data	call site: 01162	Linker::instantiate_and_start
43	1047	V128::as_u128	call site: 01047	wasm_val_t::from
39	731	ModuleParser::parse_buffered_unchecked	call site: 00731	Linker::instantiate_and_start
30	988	ResourceLimiterRef::as_resource_limiter	call site: 00988	SmallByteSlice::as_slice
24	116	StoreLimitsBuilder::new	call site: 00116	fuzz_target
18	440	FuzzVal::with_type	call site: 00440
18	710	GuardedEntity::entity_index	call site: 00710	Module::validate
18	1028	StoreInner::resolve_memory_mut	call site: 01028	wasm_val_t::from
16	215	ResourceLimiterRef::as_resource_limiter	call site: 00215	impl_try_truncate_into

Runtime coverage analysis

Covered functions

10092

Functions that are reachable but not covered

23

Reachable functions

96

Percentage of reachable functions covered

76.04%

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	51
crates/fuzz/src/module.rs	3
crates/core/src/value.rs	7
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	5
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	66
fuzz/fuzz_targets/differential.rs	6
crates/core/src/memory/access.rs	5
crates/fuzz/src/value.rs	7
crates/fuzz/src/oracle/wasmi_stack.rs	6
crates/fuzz/src/config.rs	1
crates/c_api/src/func.rs	32
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	7
crates/collections/src/arena/guarded.rs	2
crates/ir2/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	2
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	805	68.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	378	31.9%
All colors	1183	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	1027	Module::func_types_cloned	call site: 01027	impl_try_truncate_into
49	1122	LinkerError::missing_definition	call site: 01122	impl_try_truncate_into
42	428	V128::as_u128	call site: 00428	wasm_val_t::from
40	985	ModuleParser::parse_buffered_impl	call site: 00985	Linker::instantiate_and_start
30	364	ResourceLimiterRef::as_resource_limiter	call site: 00364	SmallByteSlice::as_slice
18	409	StoreInner::resolve_memory_mut	call site: 00409	wasm_val_t::from
17	155	WasmSource::into_bytes	call site: 00155	wasm_global_t::try_from
16	548	FuzzState::run	call site: 00548	FuzzState::report_divergent_behavior
16	666	FuzzState::init_params	call site: 00666
16	836	ModuleParser::process_exports	call site: 00836	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

Runtime coverage analysis

Covered functions

9455

Functions that are reachable but not covered

10

Reachable functions

70

Percentage of reachable functions covered

85.71%

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	5
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	22
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/oracle/wasmi_stack.rs	12
crates/fuzz/src/config.rs	1
crates/c_api/src/func.rs	32
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	2
crates/core/src/memory/mod.rs	6
crates/wasmi/src/store/inner.rs	7
crates/collections/src/arena/guarded.rs	2
crates/fuzz/src/oracle/exports.rs	1
crates/core/src/simd.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	66
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 / 3376

Cyclomatic complexity statically reachable by fuzzers

15 / 2463

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', 'Config::default_features', 'FuzzModule::wasm', 'ModuleParser::process_exports', 'ModuleParser::parse_buffered_unchecked', 'ModuleParser::process_imports', 'GuardedEntity::entity_index']

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', 'FuzzSmithConfig::arbitrary', 'ModuleParser::parse_buffered_data', 'V128::as_u128', 'ModuleParser::parse_buffered_unchecked', 'ResourceLimiterRef::as_resource_limiter', 'StoreLimitsBuilder::new', 'FuzzVal::with_type', 'GuardedEntity::entity_index']

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', 'LinkerError::missing_definition', 'V128::as_u128', 'ModuleParser::parse_buffered_impl', 'ResourceLimiterRef::as_resource_limiter', 'StoreInner::resolve_memory_mut', 'WasmSource::into_bytes', 'FuzzState::run', 'FuzzState::init_params', 'ModuleParser::process_exports']

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::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::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}	538	93	17.28%
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:#2}	538	93	17.28%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::encode::cranelift_codegen::machinst::buffer::MachBuffercranelift_codegen::isa::x64::lower::isle::generated_code::MInst, [i32; 2]	538	117	21.74%
cranelift_assembler_x64::inst::Instcranelift_codegen::isa::x64::inst::external::CraneliftRegisters::features	538	117	21.74%
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	8152	4262	52.28%
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	41	22	53.65%
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	41	22	53.65%
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	41	22	53.65%
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_rotr::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	41	22	53.65%
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	96	28	29.16%
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	42	18	42.85%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_lower_branch::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	177	94	53.10%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_val_minus_one::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	47	25	53.19%
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	34	13	38.23%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_cmove_from_values::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	59	21	35.59%
cranelift_codegen::isa::x64::lower::isle::generated_code::constructor_cmove_or_from_values::cranelift_codegen::machinst::isle::IsleContextcranelift_codegen::isa::x64::lower::isle::generated_code::MInst, cranelift_codegen::isa::x64::X64Backend	84	16	19.04%
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%

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/core/src/memory/error.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/table.rs	[]	[]
/src/wasmi/crates/c_api/src/types/func.rs	[]	[]
/src/wasmi/crates/core/src/fuel.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/src/module/custom_section.rs	[]	[]
/src/wasmi/crates/collections/src/arena/guarded.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/fuel_metering.rs	[]	[]
/src/wasmi/crates/collections/src/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/reftype.rs	[]	[]
/src/wasmi/crates/ir/src/enum.rs	[]	[]
/src/wasmi/crates/wasmi/src/linker.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/store/inner.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/labels.rs	[]	[]
/src/wasmi/crates/c_api/src/extern.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/instantitation.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/instantiate/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/store.rs	['translate', 'execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/executor/instrs/simd.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/exports.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/call.rs	[]	[]
/src/wasmi/crates/ir2/build.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/exports.rs	['differential']	['differential']
/src/wasmi/crates/fuzz/src/oracle/wasmi_v049.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/context.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/engine.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/collections/src/set.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/operand.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/stack/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/error.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/host_call_instantiation.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/typeid.rs	[]	[]
/src/wasmi/crates/ir/src/immeditate.rs	[]	[]
/src/wasmi/crates/cli/src/utils.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/builder.rs	[]	[]
/src/wasmi/crates/core/src/table/ty.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/module.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/vec.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/wasmi/tests/integration/resource_limiter.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasi/src/guest_memory.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/wasmi.rs	[]	[]
/src/wasmi/crates/ir2/src/op.rs	[]	[]
/src/wasmi/crates/fuzz/src/error.rs	[]	[]
/src/wasmi/crates/wast/src/lib.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/export.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/code_map.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/memory/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/utils.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/core/src/memory/access.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/host_call_compilation.rs	[]	[]
/src/wasmi/crates/cli/src/main.rs	[]	[]
/src/wasmi/crates/core/src/value.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/table/error.rs	[]	[]
/src/wasmi/crates/cli/src/display.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/visit.rs	[]	[]
/src/wasmi/crates/ir/src/index.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/builder.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/hint.rs	[]	[]
/src/wasmi/crates/ir2/src/index.rs	[]	[]
/src/wasmi/crates/ir2/src/decode/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/limits/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/cache.rs	[]	[]
/src/wasmi/crates/c_api/src/types/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/config.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/resumable.rs	[]	[]
/src/wasmi/crates/c_api/src/types/extern.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/read.rs	[]	[]
/src/wasmi/crates/c_api/src/config.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/wasmi/src/module/instantiate/tests.rs	[]	[]
/src/wasmi/crates/fuzz/src/crash_inputs.rs	[]	[]
/src/wasmi/crates/core/src/index_ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/wide_arithmetic.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/mod.rs	[]	[]
/src/wasmi/crates/core/src/simd.rs	['differential']	['differential']
/src/wasmi/crates/wasmi/src/foreach_tuple.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/element.rs	[]	[]
/src/wasmi/crates/fuzz/src/value.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/limits/engine.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/branch.rs	[]	[]
/src/wasmi/crates/c_api/src/foreign.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/parser/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/table/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/utils.rs	[]	[]
/src/wasmi/crates/core/src/memory/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/init_expr.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/select.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/global.rs	[]	[]
/src/wasmi/crates/wasmi/src/global.rs	[]	[]
/src/wasmi/crates/collections/src/arena/mod.rs	[]	[]
/src/wasmi/crates/core/src/memory/ty.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/mod.rs	[]	[]
/src/wasmi/crates/ir2/src/opcode.rs	[]	[]
/src/wasmi/crates/c_api/src/instance.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/func/ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/utils.rs	[]	[]
/src/wasmi/crates/core/src/func_type.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/layout/consts.rs	[]	[]
/src/wasmi/crates/c_api/src/val.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/value.rs	[]	[]
/src/wasmi/crates/collections/src/arena/component_vec.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/parser/buffered.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/instance/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/into_func.rs	[]	[]
/src/wasmi/crates/wasi/tests/wasi_wat.rs	[]	[]
/src/wasmi/crates/ir2/src/span.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/src/limits.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/typed_func.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/locals.rs	[]	[]
/src/wasmi/crates/ir2/src/encode.rs	[]	[]
/src/wasmi/crates/collections/src/hash.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/data.rs	[]	[]
/src/wasmi/crates/core/src/typed.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/resumable_call.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/comparator.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/error.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/limits/stack.rs	[]	[]
/src/wasmi/crates/c_api/src/table.rs	[]	[]
/src/wasmi/crates/fuzz/src/oracle/wasmtime.rs	[]	[]
/src/wasmi/crates/core/src/float.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/instantiate/error.rs	[]	[]
/src/wasmi/crates/core/src/table/element.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/macro/lib.rs	['translate', 'execute', 'differential']	[]
/src/wasmi/crates/wasmi/src/store/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/types/val.rs	[]	[]
/src/wasmi/fuzz/fuzz_targets/execute.rs	['translate', 'execute', 'differential']	['execute']
/src/wasmi/crates/ir/src/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/locals.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/driver.rs	[]	[]
/src/wasmi/crates/wasmi/src/store/pruned.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/func_inout.rs	[]	[]
/src/wasmi/crates/ir2/src/primitive.rs	[]	[]
/src/wasmi/crates/cli/src/args.rs	['translate', 'execute']	['translate', 'execute']
/src/wasmi/crates/wasmi/tests/integration/call_hook.rs	[]	[]
/src/wasmi/crates/c_api/src/ref.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/c_api/src/error.rs	['execute']	['execute']
/src/wasmi/crates/core/src/table/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/relink_result.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/store.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/visit.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/block_type.rs	[]	[]
/src/wasmi/crates/c_api/src/func.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/func.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/host_calls_wasm.rs	[]	[]
/src/wasmi/crates/wasmi/src/instance/mod.rs	[]	[]
/src/wasmi/crates/core/src/untyped.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/executor/instrs/copy.rs	[]	[]
/src/wasmi/crates/wasmi/benches/benches.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/global.rs	[]	[]
/src/wasmi/crates/collections/src/arena/dedup.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/func_types.rs	[]	[]
/src/wasmi/crates/c_api/src/types/export.rs	[]	[]
/src/wasmi/crates/c_api/src/types/table.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/tests/integration/call_host_via_engine.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/memory.rs	[]	[]
/src/wasmi/crates/wasmi/src/module/import.rs	[]	[]
/src/wasmi/crates/core/src/trap.rs	[]	[]
/src/wasmi/crates/wasmi/src/error.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/limiter.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/translator/func/mod.rs	[]	[]
/src/wasmi/crates/core/src/global.rs	[]	[]
/src/wasmi/crates/c_api/src/global.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/cli/src/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/binary.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/instrs.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/utils.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/utils.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/module/mod.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/fuzz/src/config.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/frame.rs	[]	[]
/src/wasmi/crates/c_api/src/types/memory.rs	[]	[]
/src/wasmi/crates/wasmi/src/table/ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/utils.rs	[]	[]
/src/wasmi/crates/wasi/src/sync/snapshots/preview_1.rs	[]	[]
/src/wasmi/crates/core/src/host_error.rs	[]	[]
/src/wasmi/crates/wast/tests/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/layout/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/memory/data.rs	[]	[]
/src/wasmi/crates/wasmi/tests/integration/fuel_consumption.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/comparison.rs	[]	[]
/src/wasmi/crates/core/src/wasm.rs	[]	[]
/src/wasmi/crates/wasmi/src/memory/ty.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/op.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/stack/calls.rs	[]	[]
/src/wasmi/crates/wasmi/src/func/caller.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/types/global.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/wasmi/src/table/element.rs	[]	[]
/src/wasmi/crates/collections/src/string_interner/detail.rs	[]	[]
/src/wasmi/crates/collections/src/head_vec.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/memory/mod.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/c_api/src/types/import.rs	[]	[]
/src/wasmi/crates/ir/src/primitive.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/control.rs	[]	[]
/src/wasmi/crates/core/src/table/tests.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/stack/values.rs	[]	[]
/src/wasmi/crates/wasmi/benches/bench/mod.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/traits.rs	[]	[]
/src/wasmi/crates/ir2/src/decode/op.rs	[]	[]
/src/wasmi/crates/c_api/src/memory.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/fuzz/src/oracle/mod.rs	[]	[]
/src/wasmi/crates/c_api/src/trap.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/fuzz/fuzz_targets/differential.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/collections/src/string_interner.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/ir/src/span.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/return_.rs	[]	[]
/src/wasmi/crates/ir/src/visit_results.rs	[]	[]
/src/wasmi/crates/cli/tests/run.rs	[]	[]
/src/wasmi/crates/collections/src/map.rs	['execute', 'differential']	['execute', 'differential']
/src/wasmi/crates/fuzz/src/oracle/wasmi_stack.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/wasmi/src/engine/executor/instrs/load.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/op.rs	[]	[]
/src/wasmi/crates/cli/src/context.rs	['differential']	['differential']
/src/wasmi/crates/wasmi/src/engine/executor/instr_ptr.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/operands.rs	[]	[]
/src/wasmi/fuzz/fuzz_targets/translate.rs	['translate']	[]
/src/wasmi/crates/fuzz/src/module.rs	['translate', 'execute', 'differential']	['translate', 'execute', 'differential']
/src/wasmi/crates/core/src/memory/buffer.rs	[]	[]
/src/wasmi/crates/wasmi/src/engine/executor/instrs/conversion.rs	[]	[]
/src/wasmi/crates/ir/src/for_each_op.rs	[]	[]

Directories in report

Directory
/src/wasmi/crates/wasmi/src/engine/translator/func/
/src/wasmi/crates/wast/src/
/src/wasmi/crates/wasmi/src/
/src/wasmi/crates/wasmi/src/instance/
/src/wasmi/crates/wast/tests/
/src/wasmi/crates/collections/src/
/src/wasmi/crates/wasmi/src/engine/translator/
/src/wasmi/crates/ir2/src/decode/
/src/wasmi/crates/core/src/memory/
/src/wasmi/crates/wasmi/src/table/
/src/wasmi/crates/wasi/src/sync/snapshots/
/src/wasmi/crates/wasmi/src/func/
/src/wasmi/crates/wasmi/benches/bench/
/src/wasmi/crates/core/src/
/src/wasmi/crates/wasmi/src/store/
/src/wasmi/crates/c_api/macro/
/src/wasmi/crates/c_api/src/
/src/wasmi/crates/wasmi/src/engine/translator/func/layout/
/src/wasmi/crates/ir2/src/
/src/wasmi/crates/fuzz/src/
/src/wasmi/crates/ir/src/
/src/wasmi/crates/fuzz/src/oracle/
/src/wasmi/crates/wasmi/src/module/instantiate/
/src/wasmi/crates/wasi/tests/
/src/wasmi/crates/core/src/table/
/src/wasmi/crates/collections/src/string_interner/
/src/wasmi/crates/ir2/
/src/wasmi/crates/wasmi/src/engine/executor/stack/
/src/wasmi/crates/cli/tests/
/src/wasmi/crates/wasmi/src/engine/executor/
/src/wasmi/crates/wasmi/src/memory/
/src/wasmi/crates/collections/src/arena/
/src/wasmi/crates/wasmi/src/engine/limits/
/src/wasmi/crates/c_api/src/types/
/src/wasmi/crates/wasmi/src/module/parser/
/src/wasmi/crates/wasmi/src/module/
/src/wasmi/crates/wasi/src/
/src/wasmi/crates/cli/src/
/src/wasmi/crates/wasmi/src/engine/translator/func/stack/
/src/wasmi/crates/wasmi/src/engine/executor/instrs/
/src/wasmi/crates/wasmi/benches/
/src/wasmi/fuzz/fuzz_targets/
/src/wasmi/crates/wasmi/tests/integration/
/src/wasmi/crates/wasmi/src/engine/
/src/wasmi/crates/wasmi/src/engine/translator/func/simd/

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