High level conclusions

Fuzzers reach 69.63% code coverage.

Fuzzers reach 31.56% of cyclomatic complexity.

Fuzzers reach 58.41% of all functions.

Fuzzer decompress_cross_format is blocked:

The runtime code coverage of decompress_cross_format covers 25.44% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Fuzzer generate_sequences is blocked:

The runtime code coverage of generate_sequences covers 0.0% of its statically reachable code. This means there is some place that blocks the fuzzer to continue exploring more code at run time.

Reachability and coverage overview

Functions statically reachable by fuzzers

1010 / 1729

Cyclomatic complexity statically reachable by fuzzers

7192 / 22786

Runtime code coverage of functions

1204 / 1729

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

Fuzzer: block_decompress

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	289	48.9%
gold	[1:9]	3	0.50%
yellow	[10:29]	1	0.16%
greenyellow	[30:49]	1	0.16%
lawngreen	50+	297	50.2%
All colors	591	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
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00191	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 00508	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00193	/src/zstd/lib/common/fse_decompress.c:307
22	22	1 : View List ['ZSTD_buildFSETable_body_default']	22	22	ZSTD_buildFSETable	call site: 00359	/src/zstd/lib/decompress/zstd_decompress_block.c:632
21	21	2 : View List ['FUZZ_dataProducer_uint32Range', 'FUZZ_dataProducer_int32Range']	21	21	FUZZ_malloc_rand	call site: 00005	/src/zstd/tests/fuzz/fuzz_helpers.c:28
0	0	None	0	0	ZSTD_customFree	call site: 00574	/src/zstd/lib/decompress/../common/allocations.h:48
0	0	None	0	0	ZSTD_customMalloc	call site: 00018	/src/zstd/lib/decompress/../common/allocations.h:28
0	0	None	0	0	HUF_DEltX1_set4	call site: 00283	/src/zstd/lib/decompress/huf_decompress.c:337
0	0	None	0	0	HUF_buildDEltX2U32	call site: 00310	/src/zstd/lib/decompress/huf_decompress.c:968
0	0	None	0	0	HUF_decompress4X2_usingDTable_internal	call site: 00134	/src/zstd/lib/decompress/huf_decompress.c:1726
0	0	None	0	0	HUF_decompress4X2_usingDTable_internal_fast	call site: 00169	/src/zstd/lib/decompress/huf_decompress.c:1710
0	0	None	0	0	HUF_DecompressFastArgs_init	call site: 00141	/src/zstd/lib/decompress/huf_decompress.c:203

Runtime coverage analysis

Covered functions

136

Functions that are reachable but not covered

19

Reachable functions

58

Percentage of reachable functions covered

67.24%

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
tests/fuzz/block_decompress.c	1
tests/fuzz/fuzz_data_producer.c	4
tests/fuzz/fuzz_helpers.c	2
lib/decompress/zstd_decompress.c	9
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_decompress_block.c	31
lib/decompress/../common/mem.h	14
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/huf_decompress.c	31
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/bits.h	3
lib/decompress/../common/error_private.h	1
lib/decompress/../common/compiler.h	3
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/error_private.h	1
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/zstd_ddict.c	1
lib/decompress/../legacy/zstd_legacy.h	1
lib/legacy/zstd_v04.c	3
lib/legacy/zstd_v05.c	2
lib/legacy/zstd_v06.c	2
lib/legacy/zstd_v07.c	2

Fuzzer: raw_dictionary_round_trip

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	2016	49.4%
gold	[1:9]	1	0.02%
yellow	[10:29]	2	0.04%
greenyellow	[30:49]	3	0.07%
lawngreen	50+	2055	50.4%
All colors	4077	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
551	551	2 : View List ['ZSTD_loadZstdDictionary', 'MEM_readLE32.984']	551	883	ZSTD_compress_insertDictionary	call site: 00433	/src/zstd/lib/compress/zstd_compress.c:5166
484	484	4 : View List ['ZSTD_compressBlock_fast_noDict_7_0', 'ZSTD_compressBlock_fast_noDict_6_0', 'ZSTD_compressBlock_fast_noDict_5_0', 'ZSTD_compressBlock_fast_noDict_4_0']	484	484	ZSTD_compressBlock_fast	call site: 00000	/src/zstd/lib/compress/zstd_fast.c:451
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01777	/src/zstd/lib/compress/huf_compress.c:1143
442	442	3 : View List ['MEM_readLE32.3341', 'ERR_isError.3342', 'ZSTD_loadDEntropy']	442	442	ZSTD_loadEntropy_intoDDict	call site: 02182	/src/zstd/lib/decompress/zstd_ddict.c:95
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 03844	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00682	/src/zstd/lib/common/entropy_common.c:334
310	310	2 : View List ['ZSTDMT_resize', 'ERR_isError.2987']	320	1379	ZSTDMT_initCStream_internal	call site: 00956	/src/zstd/lib/compress/zstdmt_compress.c:1247
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00684	/src/zstd/lib/common/fse_decompress.c:307
133	133	1 : View List ['ZSTDMT_updateCParams_whileCompressing']	133	3405	ZSTD_compressStream2	call site: 01164	/src/zstd/lib/compress/zstd_compress.c:6434
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 03621	/src/zstd/lib/decompress/zstd_decompress.c:707
45	45	1 : View List ['ZSTD_isUpdateAuthorized']	45	164	ZSTD_CCtx_setParameter	call site: 00101	/src/zstd/lib/compress/zstd_compress.c:719
36	36	1 : View List ['ZSTDMT_writeLastEmptyBlock']	36	36	ZSTDMT_createCompressionJob	call site: 01213	/src/zstd/lib/compress/zstdmt_compress.c:1419

Runtime coverage analysis

Covered functions

800

Functions that are reachable but not covered

83

Reachable functions

587

Percentage of reachable functions covered

85.86%

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
tests/fuzz/raw_dictionary_round_trip.c	2
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	142
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	33
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	6
lib/compress/../common/mem.h	19
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/bits.h	7
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/zstd_ddict.c	8
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: dictionary_loader

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	2696	67.8%
gold	[1:9]	6	0.15%
yellow	[10:29]	5	0.12%
greenyellow	[30:49]	1	0.02%
lawngreen	50+	1268	31.8%
All colors	3976	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
3368	3402	4 : View List ['ZSTDMT_compressStream_generic', 'ZSTD_CCtx_reset', 'ZSTDMT_updateCParams_whileCompressing', 'ZSTD_CCtx_trace']	3368	3405	ZSTD_compressStream2	call site: 01054	/src/zstd/lib/compress/zstd_compress.c:6432
1469	1469	3 : View List ['ZSTD_trace_compress_begin', 'ZSTDMT_initCStream_internal', 'ZSTDMT_createCCtx_advanced']	1469	1469	ZSTD_CCtx_init_compressStream2	call site: 00678	/src/zstd/lib/compress/zstd_compress.c:6339
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01667	/src/zstd/lib/compress/huf_compress.c:1143
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 03744	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 01347	/src/zstd/lib/compress/zstd_compress.c:3284
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 03873	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 00801	/src/zstd/lib/compress/zstdmt_compress.c:1030
136	144	2 : View List ['ZSTD_overrideCParams', 'ZSTD_dedicatedDictSearch_getCParams']	136	1066	ZSTD_createCDict_advanced2	call site: 00068	/src/zstd/lib/compress/zstd_compress.c:5623
120	120	5 : View List ['ZSTD_crossEntropyCost', 'ZSTD_fseBitCost', 'ZSTD_entropyCost', 'ZSTD_NCountCost', 'ERR_isError.1234']	120	120	ZSTD_selectEncodingType	call site: 01560	/src/zstd/lib/compress/zstd_compress_sequences.c:179
80	82	5 : View List ['ZSTD_copySequencesToSeqStoreExplicitBlockDelim', 'ERR_isError.969', 'ZSTD_fastSequenceLengthSum', 'ZSTD_postProcessSequenceProducerResult', 'ZSTD_sequenceBound']	80	153	ZSTD_buildSeqStore	call site: 01353	/src/zstd/lib/compress/zstd_compress.c:3309
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01748	/src/zstd/lib/compress/zstd_compress_sequences.c:428
61	71	2 : View List ['ZSTD_ldm_fillHashTable', 'ZSTD_window_update']	369	497	ZSTD_loadDictionaryContent	call site: 00258	/src/zstd/lib/compress/zstd_compress.c:4908

Runtime coverage analysis

Covered functions

459

Functions that are reachable but not covered

240

Reachable functions

574

Percentage of reachable functions covered

58.19%

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
tests/fuzz/dictionary_loader.c	3
tests/fuzz/fuzz_data_producer.c	4
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	136
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/zstd_decompress.c	33
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_ddict.c	8
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: generate_sequences

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	4118	100.%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	0	0.0%
All colors	4118	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
4117	0	EP	call site: 00000	ZSTD_generateSequences

Runtime coverage analysis

Covered functions

0

Functions that are reachable but not covered

563

Reachable functions

563

Percentage of reachable functions covered

0.0%

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
tests/fuzz/generate_sequences.c	2
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	1
lib/compress/zstd_compress.c	150
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
tests/fuzz/zstd_helpers.c	6
lib/compress/../common/mem.h	19
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/bits.h	7
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/zstd_decompress.c	31
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_ddict.c	5
lib/decompress/../legacy/zstd_legacy.h	6
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/../common/error_private.h	1
lib/decompress/huf_decompress.c	31
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: simple_decompress

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	810	39.0%
gold	[1:9]	4	0.19%
yellow	[10:29]	23	1.10%
greenyellow	[30:49]	5	0.24%
lawngreen	50+	1232	59.4%
All colors	2074	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
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 01423	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 01943	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 01425	/src/zstd/lib/common/fse_decompress.c:307
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 01565	/src/zstd/lib/decompress/zstd_decompress.c:707
22	22	1 : View List ['ZSTD_buildFSETable_body_default']	22	22	ZSTD_buildFSETable	call site: 01538	/src/zstd/lib/decompress/zstd_decompress_block.c:632
8	8	2 : View List ['ZSTD_DDict_dictSize', 'ZSTD_DDict_dictContent']	32	2185	ZSTD_decompressMultiFrame	call site: 00033	/src/zstd/lib/decompress/zstd_decompress.c:1080
4	4	1 : View List ['XXH_readLE32']	4	4	XXH_readLE32_align	call site: 01591	/src/zstd/lib/common/xxhash.h:2765
2	2	2 : View List ['ZSTD_decompress_insertDictionary', 'ERR_isError.3611']	2	2	ZSTD_decompressBegin_usingDict	call site: 01412	/src/zstd/lib/decompress/zstd_decompress.c:1589
2	2	1 : View List ['ZSTD_errorFrameSizeInfo']	2	2	ZSTD_findFrameSizeInfo	call site: 02048	/src/zstd/lib/decompress/zstd_decompress.c:785
0	14	3 : View List ['ZSTDv05_copy4', 'ZSTDv05_wildcopy', 'ZSTDv05_copy8']	0	14	ZSTDv05_execSequence	call site: 00791	/src/zstd/lib/legacy/zstd_v05.c:3204
0	14	3 : View List ['ZSTDv06_copy4', 'ZSTDv06_wildcopy', 'ZSTDv06_copy8']	0	14	ZSTDv06_execSequence	call site: 00993	/src/zstd/lib/legacy/zstd_v06.c:3336
0	14	3 : View List ['ZSTDv07_copy4', 'ZSTDv07_wildcopy', 'ZSTDv07_copy8']	0	14	ZSTDv07_execSequence	call site: 01320	/src/zstd/lib/legacy/zstd_v07.c:3561

Runtime coverage analysis

Covered functions

462

Functions that are reachable but not covered

8

Reachable functions

94

Percentage of reachable functions covered

91.49%

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
tests/fuzz/simple_decompress.c	1
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	1
lib/decompress/zstd_decompress.c	36
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_ddict.c	5
lib/decompress/../legacy/zstd_legacy.h	6
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/../common/error_private.h	1
lib/common/xxhash.h	16
lib/decompress/huf_decompress.c	31
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/error_private.h	2
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/zstd_decompress_block.c	30
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3
lib/common/zstd_common.c	2

Fuzzer: block_round_trip

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	1094	53.0%
gold	[1:9]	8	0.38%
yellow	[10:29]	2	0.09%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	959	46.4%
All colors	2063	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
2232	2232	1 : View List ['ZSTD_compress_frameChunk']	2232	2232	ZSTD_compressContinue_internal	call site: 00793	/src/zstd/lib/compress/zstd_compress.c:4788
1215	1217	4 : View List ['ZSTD_reset_compressedBlockState', 'MEM_readLE32.984', 'ZSTD_loadZstdDictionary', 'ZSTD_loadDictionaryContent']	1215	1217	ZSTD_compress_insertDictionary	call site: 00328	/src/zstd/lib/compress/zstd_compress.c:5158
484	484	4 : View List ['ZSTD_compressBlock_fast_noDict_7_0', 'ZSTD_compressBlock_fast_noDict_6_0', 'ZSTD_compressBlock_fast_noDict_5_0', 'ZSTD_compressBlock_fast_noDict_4_0']	484	484	ZSTD_compressBlock_fast	call site: 00000	/src/zstd/lib/compress/zstd_fast.c:451
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01254	/src/zstd/lib/compress/huf_compress.c:1143
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 00902	/src/zstd/lib/compress/zstd_compress.c:3284
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 00108	/src/zstd/lib/compress/zstd_compress.c:5206
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00618	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 01911	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00620	/src/zstd/lib/common/fse_decompress.c:307
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 01992	/src/zstd/lib/compress/zstdmt_compress.c:1030
89	89	1 : View List ['ZSTD_DUBT_findBetterDictMatch']	89	89	ZSTD_DUBT_findBestMatch	call site: 00000	/src/zstd/lib/compress/zstd_lazy.c:373
80	82	5 : View List ['ZSTD_copySequencesToSeqStoreExplicitBlockDelim', 'ERR_isError.969', 'ZSTD_fastSequenceLengthSum', 'ZSTD_postProcessSequenceProducerResult', 'ZSTD_sequenceBound']	80	153	ZSTD_buildSeqStore	call site: 00936	/src/zstd/lib/compress/zstd_compress.c:3309

Runtime coverage analysis

Covered functions

444

Functions that are reachable but not covered

182

Reachable functions

456

Percentage of reachable functions covered

60.09%

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
tests/fuzz/block_round_trip.c	2
tests/fuzz/fuzz_data_producer.c	6
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	115
lib/compress/../common/allocations.h	2
lib/compress/../common/zstd_internal.h	4
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	34
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	9
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/compress/zstd_compress_internal.h	40
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/zstd_ldm.c	20
lib/compress/../common/compiler.h	1
lib/common/xxhash.h	15
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/common/zstd_common.c	2
lib/common/error_private.c	1
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/zstd_decompress_block.c	33
lib/decompress/../common/mem.h	14
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/huf_decompress.c	31
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/bits.h	3
lib/decompress/../common/error_private.h	1
lib/decompress/../common/compiler.h	3
lib/compress/zstdmt_compress.c	8
lib/common/pool.c	2
lib/common/threading.c	2
lib/common/../common/allocations.h	1
lib/decompress/zstd_ddict.c	1
lib/decompress/../legacy/zstd_legacy.h	1
lib/legacy/zstd_v04.c	3
lib/legacy/zstd_v05.c	2
lib/legacy/zstd_v06.c	2
lib/legacy/zstd_v07.c	2

Fuzzer: dictionary_decompress

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	1543	42.0%
gold	[1:9]	8	0.21%
yellow	[10:29]	18	0.49%
greenyellow	[30:49]	7	0.19%
lawngreen	50+	2092	57.0%
All colors	3668	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
2232	2232	1 : View List ['ZSTD_compress_frameChunk']	2232	2232	ZSTD_compressContinue_internal	call site: 00919	/src/zstd/lib/compress/zstd_compress.c:4788
551	551	2 : View List ['ZSTD_loadZstdDictionary', 'MEM_readLE32.984']	551	883	ZSTD_compress_insertDictionary	call site: 00321	/src/zstd/lib/compress/zstd_compress.c:5166
484	484	4 : View List ['ZSTD_compressBlock_fast_noDict_7_0', 'ZSTD_compressBlock_fast_noDict_6_0', 'ZSTD_compressBlock_fast_noDict_5_0', 'ZSTD_compressBlock_fast_noDict_4_0']	484	484	ZSTD_compressBlock_fast	call site: 00000	/src/zstd/lib/compress/zstd_fast.c:451
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01379	/src/zstd/lib/compress/huf_compress.c:1143
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 03446	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 01027	/src/zstd/lib/compress/zstd_compress.c:3284
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 03565	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
309	309	1 : View List ['ZSTD_resetCCtx_byCopyingCDict']	309	309	ZSTD_resetCCtx_usingCDict	call site: 00767	/src/zstd/lib/compress/zstd_compress.c:2505
210	214	2 : View List ['ZSTDv05_isError', 'ZSTDv05_loadEntropy']	210	216	ZSTDv05_decompress_insertDictionary	call site: 02421	/src/zstd/lib/legacy/zstd_v05.c:3666
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 01701	/src/zstd/lib/compress/zstdmt_compress.c:1030
186	186	2 : View List ['ERR_isError.5890', 'ZSTDv06_loadEntropy']	186	188	ZSTDv06_decompress_insertDictionary	call site: 02625	/src/zstd/lib/legacy/zstd_v06.c:3806
136	144	2 : View List ['ZSTD_overrideCParams', 'ZSTD_dedicatedDictSearch_getCParams']	136	1066	ZSTD_createCDict_advanced2	call site: 00182	/src/zstd/lib/compress/zstd_compress.c:5623

Runtime coverage analysis

Covered functions

746

Functions that are reachable but not covered

178

Reachable functions

767

Percentage of reachable functions covered

76.79%

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

Function name	source code lines	source lines hit	percentage hit

Files reached

filename	functions hit
tests/fuzz/dictionary_decompress.c	1
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	1
lib/decompress/zstd_decompress.c	33
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	1
lib/dictBuilder/fastcover.c	9
lib/dictBuilder/cover.c	3
lib/dictBuilder/../compress/zstd_compress_internal.h	4
lib/dictBuilder/../common/mem.h	7
lib/dictBuilder/../common/error_private.h	1
lib/dictBuilder/zdict.c	8
lib/common/xxhash.h	16
lib/dictBuilder/../common/bits.h	2
lib/compress/zstd_compress.c	124
lib/compress/zstd_compress_internal.h	40
lib/compress/../common/mem.h	19
lib/compress/../common/error_private.h	1
lib/compress/../common/bits.h	7
lib/compress/zstd_cwksp.h	35
lib/compress/../common/compiler.h	1
lib/compress/../common/allocations.h	2
lib/compress/zstd_ldm.c	20
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/../common/zstd_internal.h	4
lib/compress/../common/cpu.h	3
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/compress/zstdmt_compress.c	8
lib/common/pool.c	2
lib/common/threading.c	2
lib/common/../common/allocations.h	1
lib/common/zstd_common.c	3
lib/decompress/zstd_ddict.c	9
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	30
lib/decompress/../common/bits.h	3
lib/common/error_private.c	1
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: decompress_dstSize_tooSmall

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	2431	70.4%
gold	[1:9]	7	0.20%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	1011	29.3%
All colors	3449	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
1215	1217	4 : View List ['ZSTD_reset_compressedBlockState', 'MEM_readLE32.984', 'ZSTD_loadZstdDictionary', 'ZSTD_loadDictionaryContent']	1215	1217	ZSTD_compress_insertDictionary	call site: 00322	/src/zstd/lib/compress/zstd_compress.c:5158
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01236	/src/zstd/lib/compress/huf_compress.c:1143
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 00884	/src/zstd/lib/compress/zstd_compress.c:3284
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 00102	/src/zstd/lib/compress/zstd_compress.c:5206
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00612	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 03293	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00614	/src/zstd/lib/common/fse_decompress.c:307
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 03381	/src/zstd/lib/compress/zstdmt_compress.c:1030
120	120	5 : View List ['ZSTD_crossEntropyCost', 'ZSTD_fseBitCost', 'ZSTD_entropyCost', 'ZSTD_NCountCost', 'ERR_isError.1234']	120	120	ZSTD_selectEncodingType	call site: 01127	/src/zstd/lib/compress/zstd_compress_sequences.c:179
80	82	5 : View List ['ZSTD_copySequencesToSeqStoreExplicitBlockDelim', 'ERR_isError.969', 'ZSTD_fastSequenceLengthSum', 'ZSTD_postProcessSequenceProducerResult', 'ZSTD_sequenceBound']	80	153	ZSTD_buildSeqStore	call site: 00918	/src/zstd/lib/compress/zstd_compress.c:3309
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01317	/src/zstd/lib/compress/zstd_compress_sequences.c:428
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 02950	/src/zstd/lib/decompress/zstd_decompress.c:707

Runtime coverage analysis

Covered functions

394

Functions that are reachable but not covered

180

Reachable functions

454

Percentage of reachable functions covered

60.35%

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
tests/fuzz/decompress_dstSize_tooSmall.c	1
tests/fuzz/fuzz_data_producer.c	4
tests/fuzz/fuzz_helpers.c	1
lib/compress/zstd_compress.c	115
lib/compress/../common/allocations.h	2
lib/compress/../common/zstd_internal.h	4
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	34
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	31
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/compress/zstd_compress_internal.h	40
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/zstd_ldm.c	20
lib/compress/../common/compiler.h	1
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/common/zstd_common.c	3
lib/common/error_private.c	1
lib/decompress/zstd_ddict.c	5
lib/decompress/../legacy/zstd_legacy.h	6
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/../common/error_private.h	1
lib/decompress/huf_decompress.c	31
lib/decompress/zstd_decompress_block.c	30
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3
lib/compress/zstdmt_compress.c	8
lib/common/pool.c	2
lib/common/threading.c	2
lib/common/../common/allocations.h	1

Fuzzer: zstd_frame_info

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	52	25.0%
gold	[1:9]	3	1.44%
yellow	[10:29]	6	2.88%
greenyellow	[30:49]	2	0.96%
lawngreen	50+	145	69.7%
All colors	208	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
0	0	None	0	2	ZSTDv01_findFrameSizeInfoLegacy	call site: 00094	/src/zstd/lib/legacy/zstd_v01.c:1994
0	0	1 : View List ['MEM_swap32.4384']	0	0	MEM_writeLE32	call site: 00058	/src/zstd/lib/dictBuilder/../common/mem.h:336
0	0	None	0	0	ZSTD_getDecompressedSize_legacy	call site: 00016	/src/zstd/lib/decompress/../legacy/zstd_legacy.h:110
0	0	None	0	0	ZSTDv02_findFrameSizeInfoLegacy	call site: 00103	/src/zstd/lib/legacy/zstd_v02.c:3295
0	0	None	0	0	ZSTDv03_findFrameSizeInfoLegacy	call site: 00114	/src/zstd/lib/legacy/zstd_v03.c:2934
0	0	None	0	0	ZSTDv04_findFrameSizeInfoLegacy	call site: 00125	/src/zstd/lib/legacy/zstd_v04.c:3105
0	0	None	0	0	ZSTDv05_findFrameSizeInfoLegacy	call site: 00136	/src/zstd/lib/legacy/zstd_v05.c:3496
0	0	None	0	0	ZSTDv06_findFrameSizeInfoLegacy	call site: 00147	/src/zstd/lib/legacy/zstd_v06.c:3630
0	0	None	0	0	ZSTDv07_getFrameParams	call site: 00032	/src/zstd/lib/legacy/zstd_v07.c:3101
0	0	None	0	0	ZSTDv07_findFrameSizeInfoLegacy	call site: 00157	/src/zstd/lib/legacy/zstd_v07.c:3874
0	0	None	0	0	ZSTDv07_findFrameSizeInfoLegacy	call site: 00159	/src/zstd/lib/legacy/zstd_v07.c:3878
0	0	1 : View List ['MEM_swap32.6228']	0	0	MEM_readLE32	call site: 00007	/src/zstd/lib/legacy/zstd_v07.c:351

Runtime coverage analysis

Covered functions

54

Functions that are reachable but not covered

3

Reachable functions

56

Percentage of reachable functions covered

94.64%

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
tests/fuzz/zstd_frame_info.c	1
lib/decompress/zstd_decompress.c	16
lib/decompress/../legacy/zstd_legacy.h	3
lib/decompress/../common/mem.h	12
lib/legacy/zstd_v05.c	5
lib/legacy/../common/mem.h	4
lib/legacy/zstd_v06.c	14
lib/legacy/zstd_v07.c	15
lib/legacy/zstd_v01.c	5
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	7
lib/legacy/zstd_v03.c	7
lib/legacy/zstd_v04.c	7
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	1

Fuzzer: seekable_roundtrip

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	2917	67.6%
gold	[1:9]	0	0.0%
yellow	[10:29]	3	0.06%
greenyellow	[30:49]	1	0.02%
lawngreen	50+	1391	32.2%
All colors	4312	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
3368	3402	4 : View List ['ZSTDMT_compressStream_generic', 'ZSTD_CCtx_reset', 'ZSTDMT_updateCParams_whileCompressing', 'ZSTD_CCtx_trace']	3368	3405	ZSTD_compressStream2	call site: 01080	/src/zstd/lib/compress/zstd_compress.c:6432
1469	1469	3 : View List ['ZSTD_trace_compress_begin', 'ZSTDMT_initCStream_internal', 'ZSTDMT_createCCtx_advanced']	1469	1469	ZSTD_CCtx_init_compressStream2	call site: 00804	/src/zstd/lib/compress/zstd_compress.c:6339
1215	1217	4 : View List ['ZSTD_reset_compressedBlockState', 'MEM_readLE32.984', 'ZSTD_loadZstdDictionary', 'ZSTD_loadDictionaryContent']	1215	1217	ZSTD_compress_insertDictionary	call site: 00365	/src/zstd/lib/compress/zstd_compress.c:5158
835	835	1 : View List ['ZSTD_createCDict_advanced2']	835	835	ZSTD_initLocalDict	call site: 00191	/src/zstd/lib/compress/zstd_compress.c:1263
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01692	/src/zstd/lib/compress/huf_compress.c:1143
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 01372	/src/zstd/lib/compress/zstd_compress.c:3284
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 00955	/src/zstd/lib/compress/zstd_compress.c:5206
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00655	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 04139	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00657	/src/zstd/lib/common/fse_decompress.c:307
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 00054	/src/zstd/lib/compress/zstdmt_compress.c:1030
89	89	1 : View List ['ZSTD_DUBT_findBetterDictMatch']	89	89	ZSTD_DUBT_findBestMatch	call site: 00000	/src/zstd/lib/compress/zstd_lazy.c:373

Runtime coverage analysis

Covered functions

598

Functions that are reachable but not covered

486

Reachable functions

905

Percentage of reachable functions covered

46.3%

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
tests/fuzz/seekable_roundtrip.c	1
tests/fuzz/fuzz_data_producer.c	6
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	142
tests/fuzz/../../contrib/seekable_format/zstdseek_compress.c	12
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/compress/zstdmt_compress.c	52
lib/common/pool.c	9
lib/common/threading.c	4
lib/common/../common/allocations.h	2
tests/fuzz/../../contrib/seekable_format/zstdseek_decompress.c	8
lib/decompress/zstd_decompress.c	53
lib/decompress/../common/allocations.h	3
lib/decompress/../common/zstd_internal.h	4
lib/decompress/../common/cpu.h	3
lib/common/xxhash.h	16
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	16
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/zstd_ddict.c	5
lib/decompress/../common/error_private.h	1
lib/common/error_private.c	1
lib/decompress/../legacy/zstd_legacy.h	8
lib/legacy/zstd_v04.c	67
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v05.c	72
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	83
lib/legacy/zstd_v07.c	95
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/decompress/zstd_decompress_block.c	32
lib/decompress/huf_decompress.c	31
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: stream_round_trip

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	2276	52.1%
gold	[1:9]	1	0.02%
yellow	[10:29]	6	0.13%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	2078	47.6%
All colors	4361	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
839	839	1 : View List ['ZSTD_createCDict_advanced']	839	1031	ZSTDMT_initCStream_internal	call site: 00983	/src/zstd/lib/compress/zstdmt_compress.c:1263
835	835	1 : View List ['ZSTD_createCDict_advanced2']	835	835	ZSTD_initLocalDict	call site: 00277	/src/zstd/lib/compress/zstd_compress.c:1263
551	551	2 : View List ['ZSTD_loadZstdDictionary', 'MEM_readLE32.984']	551	883	ZSTD_compress_insertDictionary	call site: 00428	/src/zstd/lib/compress/zstd_compress.c:5166
484	484	4 : View List ['ZSTD_compressBlock_fast_noDict_7_0', 'ZSTD_compressBlock_fast_noDict_6_0', 'ZSTD_compressBlock_fast_noDict_5_0', 'ZSTD_compressBlock_fast_noDict_4_0']	484	484	ZSTD_compressBlock_fast	call site: 00000	/src/zstd/lib/compress/zstd_fast.c:451
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01772	/src/zstd/lib/compress/huf_compress.c:1143
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 01034	/src/zstd/lib/compress/zstd_compress.c:5206
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00677	/src/zstd/lib/common/entropy_common.c:334
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00679	/src/zstd/lib/common/fse_decompress.c:307
133	133	1 : View List ['ZSTDMT_updateCParams_whileCompressing']	133	3405	ZSTD_compressStream2	call site: 01159	/src/zstd/lib/compress/zstd_compress.c:6434
89	89	1 : View List ['ZSTD_DUBT_findBetterDictMatch']	89	89	ZSTD_DUBT_findBestMatch	call site: 00000	/src/zstd/lib/compress/zstd_lazy.c:373
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01853	/src/zstd/lib/compress/zstd_compress_sequences.c:428
61	71	2 : View List ['ZSTD_ldm_fillHashTable', 'ZSTD_window_update']	119	497	ZSTD_loadDictionaryContent	call site: 00446	/src/zstd/lib/compress/zstd_compress.c:4908

Runtime coverage analysis

Covered functions

739

Functions that are reachable but not covered

353

Reachable functions

866

Percentage of reachable functions covered

59.24%

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
tests/fuzz/stream_round_trip.c	5
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	140
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	50
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	4
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	6
lib/compress/../common/mem.h	19
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/bits.h	7
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/../common/error_private.h	1
lib/decompress/../legacy/zstd_legacy.h	8
lib/legacy/zstd_v04.c	67
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v05.c	72
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	83
lib/legacy/zstd_v07.c	95
lib/decompress/../common/mem.h	16
lib/decompress/zstd_ddict.c	5
lib/legacy/zstd_v01.c	57
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/decompress/zstd_decompress_block.c	32
lib/decompress/huf_decompress.c	31
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: decompress_cross_format

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	1825	76.8%
gold	[1:9]	3	0.12%
yellow	[10:29]	5	0.21%
greenyellow	[30:49]	1	0.04%
lawngreen	50+	540	22.7%
All colors	2374	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
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 01472	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 01988	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 01474	/src/zstd/lib/common/fse_decompress.c:307
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 01614	/src/zstd/lib/decompress/zstd_decompress.c:707
22	22	1 : View List ['ZSTD_buildFSETable_body_default']	22	22	ZSTD_buildFSETable	call site: 01587	/src/zstd/lib/decompress/zstd_decompress_block.c:632
8	8	2 : View List ['ZSTD_DDict_dictSize', 'ZSTD_DDict_dictContent']	1773	2185	ZSTD_decompressMultiFrame	call site: 00206	/src/zstd/lib/decompress/zstd_decompress.c:1080
8	8	2 : View List ['ZSTD_DDict_dictSize', 'ZSTD_DDict_dictContent']	13	23	ZSTD_decompressBegin_usingDDict	call site: 01447	/src/zstd/lib/decompress/zstd_decompress.c:1603
5	5	1 : View List ['ZSTD_copyDDictParameters']	5	5	ZSTD_decompressBegin_usingDDict	call site: 01454	/src/zstd/lib/decompress/zstd_decompress.c:1612
4	4	1 : View List ['XXH_readLE32']	4	4	XXH_readLE32_align	call site: 01640	/src/zstd/lib/common/xxhash.h:2765
2	2	2 : View List ['ZSTD_decompress_insertDictionary', 'ERR_isError.3611']	2	2	ZSTD_decompressBegin_usingDict	call site: 01461	/src/zstd/lib/decompress/zstd_decompress.c:1589
0	4	1 : View List ['XXH_readLE64']	0	4	XXH_readLE64_align	call site: 01622	/src/zstd/lib/common/xxhash.h:3295
0	0	None	3687	6501	ZSTD_decompressStream	call site: 02222	/src/zstd/lib/decompress/zstd_decompress.c:2136

Runtime coverage analysis

Covered functions

194

Functions that are reachable but not covered

296

Reachable functions

397

Percentage of reachable functions covered

25.44%

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
tests/fuzz/decompress_cross_format.c	1
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	1
lib/decompress/zstd_decompress.c	51
lib/decompress/../legacy/zstd_legacy.h	8
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	67
lib/legacy/zstd_v05.c	72
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	83
lib/legacy/zstd_v07.c	95
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	30
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	4
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_ddict.c	5
lib/common/error_private.c	1
lib/common/xxhash.h	16
lib/decompress/huf_decompress.c	31
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: dictionary_round_trip

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	1943	45.1%
gold	[1:9]	7	0.16%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	5	0.11%
lawngreen	50+	2352	54.6%
All colors	4307	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
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01387	/src/zstd/lib/compress/huf_compress.c:1143
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 04074	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 04203	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
310	310	2 : View List ['ZSTDMT_resize', 'ERR_isError.2987']	320	1379	ZSTDMT_initCStream_internal	call site: 02063	/src/zstd/lib/compress/zstdmt_compress.c:1247
133	133	1 : View List ['ZSTDMT_updateCParams_whileCompressing']	133	3405	ZSTD_compressStream2	call site: 02140	/src/zstd/lib/compress/zstd_compress.c:6434
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 03851	/src/zstd/lib/decompress/zstd_decompress.c:707
45	45	1 : View List ['ZSTD_isUpdateAuthorized']	45	164	ZSTD_CCtx_setParameter	call site: 01838	/src/zstd/lib/compress/zstd_compress.c:719
36	36	1 : View List ['ZSTDMT_writeLastEmptyBlock']	36	36	ZSTDMT_createCompressionJob	call site: 02189	/src/zstd/lib/compress/zstdmt_compress.c:1419
31	31	2 : View List ['ZSTD_XXH64_digest', 'MEM_readLE32.3617']	31	44	ZSTD_decompressFrame	call site: 04267	/src/zstd/lib/decompress/zstd_decompress.c:1047
31	31	2 : View List ['MEM_writeLE32.1047', 'ZSTD_XXH64_digest']	31	31	ZSTD_writeEpilogue	call site: 01790	/src/zstd/lib/compress/zstd_compress.c:5323
22	24	2 : View List ['ZSTD_getSeqStore', 'ZSTD_copyBlockSequences']	22	26	ZSTD_compressBlock_internal	call site: 01633	/src/zstd/lib/compress/zstd_compress.c:4365
22	22	1 : View List ['ZSTD_copyBlockSequences']	22	24	ZSTD_compressSeqStore_singleBlock	call site: 01598	/src/zstd/lib/compress/zstd_compress.c:4102

Runtime coverage analysis

Covered functions

870

Functions that are reachable but not covered

66

Reachable functions

624

Percentage of reachable functions covered

89.42%

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
tests/fuzz/dictionary_round_trip.c	2
tests/fuzz/fuzz_data_producer.c	8
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	153
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	33
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	7
lib/dictBuilder/fastcover.c	9
lib/dictBuilder/cover.c	3
lib/dictBuilder/../compress/zstd_compress_internal.h	4
lib/dictBuilder/../common/mem.h	7
lib/dictBuilder/../common/error_private.h	1
lib/dictBuilder/zdict.c	8
lib/common/xxhash.h	16
lib/dictBuilder/../common/bits.h	2
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/threading.c	4
lib/common/../common/allocations.h	2
lib/common/zstd_common.c	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/decompress/zstd_ddict.c	8
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: huf_round_trip

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	129	21.5%
gold	[1:9]	5	0.83%
yellow	[10:29]	2	0.33%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	463	77.2%
All colors	599	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
0	14	1 : View List ['HIST_count_parallel_wksp']	0	14	HIST_count_wksp	call site: 00026	/src/zstd/lib/compress/hist.c:170
0	0	None	0	9	FUZZ_dataProducer_int32Range	call site: 00007	/src/zstd/tests/fuzz/fuzz_data_producer.c:60
0	0	None	0	4	FSE_buildDTable_internal	call site: 00259	/src/zstd/lib/common/fse_decompress.c:81
0	0	None	0	0	FSE_buildDTable_internal	call site: 00259	/src/zstd/lib/common/fse_decompress.c:92
0	0	1 : View List ['MEM_writeLE32.1215']	0	0	MEM_writeLEST	call site: 00175	/src/zstd/lib/compress/../common/mem.h:368
0	0	1 : View List ['MEM_swap64.1209']	0	0	MEM_writeLE64	call site: 00182	/src/zstd/lib/compress/../common/mem.h:352
0	0	None	0	0	FSE_buildCTable_wksp	call site: 00145	/src/zstd/lib/compress/fse_compress.c:104
0	0	None	0	0	FSE_buildCTable_wksp	call site: 00147	/src/zstd/lib/compress/fse_compress.c:116
0	0	None	0	0	FSE_writeNCount_generic	call site: 00138	/src/zstd/lib/compress/fse_compress.c:314
0	0	None	0	0	FSE_normalizeM2	call site: 00133	/src/zstd/lib/compress/fse_compress.c:412
0	0	None	0	0	FSE_normalizeM2	call site: 00133	/src/zstd/lib/compress/fse_compress.c:415
0	0	None	0	0	FSE_normalizeM2	call site: 00133	/src/zstd/lib/compress/fse_compress.c:428

Runtime coverage analysis

Covered functions

175

Functions that are reachable but not covered

13

Reachable functions

158

Percentage of reachable functions covered

91.77%

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
tests/fuzz/huf_round_trip.c	2
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	2
lib/common/cpu.h	2
lib/compress/hist.c	5
lib/compress/../common/mem.h	13
lib/common/zstd_common.c	2
lib/common/error_private.h	3
lib/common/error_private.c	1
lib/common/bits.h	3
lib/compress/huf_compress.c	35
lib/compress/fse_compress.c	11
lib/compress/../common/bits.h	2
lib/compress/../common/error_private.h	1
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	4
lib/decompress/huf_decompress.c	26
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/../common/error_private.h	1
lib/decompress/../common/mem.h	13
lib/decompress/../common/bitstream.h	4
lib/decompress/../common/bits.h	3
lib/decompress/../common/compiler.h	1

Fuzzer: sequence_compression_api

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	2228	67.4%
gold	[1:9]	74	2.24%
yellow	[10:29]	4	0.12%
greenyellow	[30:49]	1	0.03%
lawngreen	50+	995	30.1%
All colors	3302	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
1469	1469	3 : View List ['ZSTD_trace_compress_begin', 'ZSTDMT_initCStream_internal', 'ZSTDMT_createCCtx_advanced']	1469	1469	ZSTD_CCtx_init_compressStream2	call site: 00871	/src/zstd/lib/compress/zstd_compress.c:6339
551	551	2 : View List ['ZSTD_loadZstdDictionary', 'MEM_readLE32.984']	551	883	ZSTD_compress_insertDictionary	call site: 00290	/src/zstd/lib/compress/zstd_compress.c:5166
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 00000	/src/zstd/lib/compress/huf_compress.c:1143
442	442	3 : View List ['MEM_readLE32.3341', 'ERR_isError.3342', 'ZSTD_loadDEntropy']	442	442	ZSTD_loadEntropy_intoDDict	call site: 00721	/src/zstd/lib/decompress/zstd_ddict.c:95
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 03062	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00579	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 03193	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
309	309	1 : View List ['ZSTD_resetCCtx_byCopyingCDict']	309	309	ZSTD_resetCCtx_usingCDict	call site: 01078	/src/zstd/lib/compress/zstd_compress.c:2505
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00581	/src/zstd/lib/common/fse_decompress.c:307
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 00950	/src/zstd/lib/compress/zstdmt_compress.c:1030
136	144	2 : View List ['ZSTD_overrideCParams', 'ZSTD_dedicatedDictSearch_getCParams']	136	1066	ZSTD_createCDict_advanced2	call site: 00151	/src/zstd/lib/compress/zstd_compress.c:5623
82	82	3 : View List ['ZSTD_DDictHashSet_addDDict', 'ZSTD_createDDictHashSet', 'ERR_isError.3611']	82	82	ZSTD_DCtx_refDDict	call site: 00822	/src/zstd/lib/decompress/zstd_decompress.c:1785

Runtime coverage analysis

Covered functions

423

Functions that are reachable but not covered

154

Reachable functions

434

Percentage of reachable functions covered

64.52%

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
tests/fuzz/sequence_compression_api.c	6
tests/fuzz/fuzz_data_producer.c	6
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	92
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	1
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	36
lib/decompress/../common/allocations.h	3
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
lib/compress/zstd_compress_internal.h	36
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	8
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	5
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	10
lib/decompress/zstd_ddict.c	8
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/common/zstd_common.c	3
lib/common/error_private.c	1
lib/compress/zstdmt_compress.c	30
lib/common/pool.c	6
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_compress_literals.c	5
lib/compress/hist.c	3
lib/compress/zstd_compress_sequences.c	11
lib/compress/../common/fse.h	5
lib/compress/../common/bitstream.h	5
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: stream_decompress

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	818	35.1%
gold	[1:9]	14	0.60%
yellow	[10:29]	18	0.77%
greenyellow	[30:49]	12	0.51%
lawngreen	50+	1464	62.9%
All colors	2326	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
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 02042	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 01680	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 02166	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 01682	/src/zstd/lib/common/fse_decompress.c:307
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 01822	/src/zstd/lib/decompress/zstd_decompress.c:707
54	54	1 : View List ['ZSTD_getFrameHeader']	54	54	ZSTD_getFrameContentSize	call site: 01641	/src/zstd/lib/decompress/zstd_decompress.c:570
22	22	1 : View List ['ZSTD_buildFSETable_body_default']	22	22	ZSTD_buildFSETable	call site: 01795	/src/zstd/lib/decompress/zstd_decompress_block.c:632
8	8	2 : View List ['ZSTD_DDict_dictSize', 'ZSTD_DDict_dictContent']	13	23	ZSTD_decompressBegin_usingDDict	call site: 01655	/src/zstd/lib/decompress/zstd_decompress.c:1603
8	8	2 : View List ['ZSTD_DDict_dictSize', 'ZSTD_DDict_dictContent']	8	2185	ZSTD_decompressMultiFrame	call site: 01212	/src/zstd/lib/decompress/zstd_decompress.c:1080
5	5	1 : View List ['ZSTD_copyDDictParameters']	5	5	ZSTD_decompressBegin_usingDDict	call site: 01662	/src/zstd/lib/decompress/zstd_decompress.c:1612
4	4	1 : View List ['XXH_readLE32']	4	4	XXH_readLE32_align	call site: 00608	/src/zstd/lib/common/xxhash.h:2765
2	2	2 : View List ['ZSTD_decompress_insertDictionary', 'ERR_isError.3611']	2	2	ZSTD_decompressBegin_usingDict	call site: 01669	/src/zstd/lib/decompress/zstd_decompress.c:1589

Runtime coverage analysis

Covered functions

529

Functions that are reachable but not covered

35

Reachable functions

406

Percentage of reachable functions covered

91.38%

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
tests/fuzz/stream_decompress.c	3
tests/fuzz/fuzz_data_producer.c	6
tests/fuzz/fuzz_helpers.c	1
lib/decompress/zstd_decompress.c	50
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	4
lib/decompress/../common/cpu.h	3
lib/decompress/zstd_ddict.c	5
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
lib/decompress/../common/error_private.h	1
lib/decompress/../legacy/zstd_legacy.h	8
lib/legacy/zstd_v04.c	67
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v05.c	72
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	83
lib/legacy/zstd_v07.c	95
lib/common/xxhash.h	16
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/decompress/zstd_decompress_block.c	30
lib/decompress/huf_decompress.c	31
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: huf_decompress

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	92	31.0%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	0	0.0%
lawngreen	50+	204	68.9%
All colors	296	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
0	0	None	0	9	FUZZ_dataProducer_int32Range	call site: 00007	/src/zstd/tests/fuzz/fuzz_data_producer.c:60
0	0	None	0	0	HUF_DEltX1_set4	call site: 00125	/src/zstd/lib/decompress/huf_decompress.c:337
0	0	None	0	0	HUF_buildDEltX2U32	call site: 00147	/src/zstd/lib/decompress/huf_decompress.c:968
0	0	None	0	0	HUF_decompress4X2_usingDTable_internal_fast	call site: 00275	/src/zstd/lib/decompress/huf_decompress.c:1710
0	0	None	0	0	HUF_DecompressFastArgs_init	call site: 00247	/src/zstd/lib/decompress/huf_decompress.c:203
0	0	None	0	0	HUF_initRemainingDStream	call site: 00270	/src/zstd/lib/decompress/huf_decompress.c:284
0	0	None	0	0	FUZZ_dataProducer_uint32Range	call site: 00010	/src/zstd/tests/fuzz/fuzz_data_producer.c:44

Runtime coverage analysis

Covered functions

99

Functions that are reachable but not covered

7

Reachable functions

84

Percentage of reachable functions covered

91.67%

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
tests/fuzz/huf_decompress.c	1
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	1
lib/common/cpu.h	2
lib/decompress/huf_decompress.c	26
lib/common/entropy_common.c	8
lib/common/fse_decompress.c	4
lib/common/error_private.h	1
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/decompress/../common/error_private.h	1
lib/decompress/../common/mem.h	13
lib/common/zstd_common.c	1
lib/decompress/../common/bitstream.h	4
lib/decompress/../common/bits.h	3
lib/decompress/../common/compiler.h	1

Fuzzer: fse_read_ncount

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	16	21.3%
gold	[1:9]	0	0.0%
yellow	[10:29]	0	0.0%
greenyellow	[30:49]	1	1.33%
lawngreen	50+	58	77.3%
All colors	75	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
67	67	1 : View List ['FSE_readNCount_body_bmi2']	67	67	FSE_readNCount_bmi2	call site: 00038	/src/zstd/lib/common/entropy_common.c:211
0	0	None	0	27	FSE_writeNCount	call site: 00020	/src/zstd/lib/compress/fse_compress.c:336
0	0	None	0	9	FUZZ_dataProducer_int32Range	call site: 00011	/src/zstd/tests/fuzz/fuzz_data_producer.c:60
0	0	None	0	0	FSE_writeNCount_generic	call site: 00021	/src/zstd/lib/compress/fse_compress.c:268
0	0	None	0	0	FSE_writeNCount_generic	call site: 00021	/src/zstd/lib/compress/fse_compress.c:283
0	0	None	0	0	FSE_writeNCount_generic	call site: 00021	/src/zstd/lib/compress/fse_compress.c:305
0	0	None	0	0	FSE_writeNCount_generic	call site: 00021	/src/zstd/lib/compress/fse_compress.c:314
0	0	None	0	0	FSE_writeNCount_generic	call site: 00022	/src/zstd/lib/compress/fse_compress.c:319
0	0	None	0	0	FUZZ_dataProducer_uint32Range	call site: 00007	/src/zstd/tests/fuzz/fuzz_data_producer.c:44
0	0	None	0	0	FUZZ_malloc	call site: 00002	/src/zstd/tests/fuzz/fuzz_helpers.c:18

Runtime coverage analysis

Covered functions

22

Functions that are reachable but not covered

9

Reachable functions

24

Percentage of reachable functions covered

62.5%

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
tests/fuzz/fse_read_ncount.c	1
tests/fuzz/fuzz_data_producer.c	4
tests/fuzz/fuzz_helpers.c	1
lib/compress/fse_compress.c	3
lib/common/zstd_common.c	2
lib/common/error_private.h	3
lib/common/error_private.c	1
lib/common/entropy_common.c	5
lib/common/mem.h	4
lib/common/bits.h	3

Fuzzer: simple_compress

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	707	44.9%
gold	[1:9]	2	0.12%
yellow	[10:29]	3	0.19%
greenyellow	[30:49]	3	0.19%
lawngreen	50+	859	54.5%
All colors	1574	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
1215	1217	4 : View List ['ZSTD_reset_compressedBlockState', 'MEM_readLE32.984', 'ZSTD_loadZstdDictionary', 'ZSTD_loadDictionaryContent']	1215	1217	ZSTD_compress_insertDictionary	call site: 00316	/src/zstd/lib/compress/zstd_compress.c:5158
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01230	/src/zstd/lib/compress/huf_compress.c:1143
374	374	2 : View List ['ZSTD_ldm_generateSequences', 'ZSTD_ldm_blockCompress']	374	378	ZSTD_buildSeqStore	call site: 00878	/src/zstd/lib/compress/zstd_compress.c:3284
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 00096	/src/zstd/lib/compress/zstd_compress.c:5206
200	213	9 : View List ['ZSTD_freeCDict', 'ZSTDMT_freeCCtxPool', 'ZSTDMT_serialState_free', 'ZSTDMT_freeJobsTable', 'ZSTDMT_freeBufferPool', 'POOL_free', 'ZSTDMT_freeSeqPool', 'ZSTD_customFree.2986', 'ZSTDMT_releaseAllJobResources']	200	213	ZSTDMT_freeCCtx	call site: 01523	/src/zstd/lib/compress/zstdmt_compress.c:1030
89	89	1 : View List ['ZSTD_DUBT_findBetterDictMatch']	89	89	ZSTD_DUBT_findBestMatch	call site: 00000	/src/zstd/lib/compress/zstd_lazy.c:373
80	82	5 : View List ['ZSTD_copySequencesToSeqStoreExplicitBlockDelim', 'ERR_isError.969', 'ZSTD_fastSequenceLengthSum', 'ZSTD_postProcessSequenceProducerResult', 'ZSTD_sequenceBound']	80	153	ZSTD_buildSeqStore	call site: 00912	/src/zstd/lib/compress/zstd_compress.c:3309
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01311	/src/zstd/lib/compress/zstd_compress_sequences.c:428
31	31	2 : View List ['MEM_writeLE32.1047', 'ZSTD_XXH64_digest']	31	31	ZSTD_writeEpilogue	call site: 01498	/src/zstd/lib/compress/zstd_compress.c:5323
24	24	2 : View List ['ZSTD_getSeqStore', 'ZSTD_copyBlockSequences']	24	26	ZSTD_compressBlock_internal	call site: 01476	/src/zstd/lib/compress/zstd_compress.c:4365
22	22	1 : View List ['ZSTD_copyBlockSequences']	22	24	ZSTD_compressSeqStore_singleBlock	call site: 01441	/src/zstd/lib/compress/zstd_compress.c:4102
18	18	1 : View List ['ZSTD_XXH64_update']	1971	4107	ZSTD_compress_frameChunk	call site: 00771	/src/zstd/lib/compress/zstd_compress.c:4564

Runtime coverage analysis

Covered functions

404

Functions that are reachable but not covered

139

Reachable functions

432

Percentage of reachable functions covered

67.82%

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
tests/fuzz/simple_compress.c	1
tests/fuzz/fuzz_data_producer.c	6
tests/fuzz/fuzz_helpers.c	1
lib/compress/zstd_compress.c	115
lib/compress/../common/allocations.h	2
lib/compress/../common/zstd_internal.h	4
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	34
lib/compress/../common/error_private.h	1
lib/compress/zstd_compress_internal.h	40
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/zstd_ldm.c	20
lib/compress/../common/compiler.h	1
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	2
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/common/zstd_common.c	2
lib/compress/zstdmt_compress.c	8
lib/common/pool.c	2
lib/common/threading.c	2
lib/common/../common/allocations.h	1

Fuzzer: dictionary_stream_round_trip

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	1910	44.4%
gold	[1:9]	4	0.09%
yellow	[10:29]	2	0.04%
greenyellow	[30:49]	9	0.20%
lawngreen	50+	2370	55.1%
All colors	4295	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
484	484	4 : View List ['ZSTD_compressBlock_fast_noDict_7_0', 'ZSTD_compressBlock_fast_noDict_6_0', 'ZSTD_compressBlock_fast_noDict_5_0', 'ZSTD_compressBlock_fast_noDict_4_0']	484	484	ZSTD_compressBlock_fast	call site: 00000	/src/zstd/lib/compress/zstd_fast.c:451
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01386	/src/zstd/lib/compress/huf_compress.c:1143
431	431	1 : View List ['ZSTD_decompressSequencesLong_default']	431	431	ZSTD_decompressSequencesLong	call site: 04062	/src/zstd/lib/decompress/zstd_decompress_block.c:1988
133	133	1 : View List ['ZSTDMT_updateCParams_whileCompressing']	133	3405	ZSTD_compressStream2	call site: 02107	/src/zstd/lib/compress/zstd_compress.c:6434
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01467	/src/zstd/lib/compress/zstd_compress_sequences.c:428
57	57	1 : View List ['ZSTD_DCtx_selectFrameDDict']	57	61	ZSTD_decodeFrameHeader	call site: 03839	/src/zstd/lib/decompress/zstd_decompress.c:707
45	45	1 : View List ['ZSTD_isUpdateAuthorized']	45	164	ZSTD_CCtx_setParameter	call site: 01792	/src/zstd/lib/compress/zstd_compress.c:719
22	24	2 : View List ['ZSTD_getSeqStore', 'ZSTD_copyBlockSequences']	22	26	ZSTD_compressBlock_internal	call site: 01632	/src/zstd/lib/compress/zstd_compress.c:4365
22	22	1 : View List ['ZSTD_copyBlockSequences']	22	24	ZSTD_compressSeqStore_singleBlock	call site: 01597	/src/zstd/lib/compress/zstd_compress.c:4102
10	25	2 : View List ['ZSTDMT_releaseAllJobResources', 'ZSTDMT_waitForAllJobsCompleted']	10	1069	ZSTDMT_initCStream_internal	call site: 02057	/src/zstd/lib/compress/zstdmt_compress.c:1255
10	25	2 : View List ['ZSTDMT_releaseAllJobResources', 'ZSTDMT_waitForAllJobsCompleted']	10	25	ZSTDMT_flushProduced	call site: 02306	/src/zstd/lib/compress/zstdmt_compress.c:1479
6	6	1 : View List ['ZSTD_window_isEmpty']	6	513	ZSTD_loadDictionaryContent	call site: 00361	/src/zstd/lib/compress/zstd_compress.c:4899

Runtime coverage analysis

Covered functions

853

Functions that are reachable but not covered

62

Reachable functions

619

Percentage of reachable functions covered

89.98%

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
tests/fuzz/dictionary_stream_round_trip.c	4
tests/fuzz/fuzz_data_producer.c	5
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	149
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	33
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	7
lib/dictBuilder/fastcover.c	9
lib/dictBuilder/cover.c	3
lib/dictBuilder/../compress/zstd_compress_internal.h	4
lib/dictBuilder/../common/mem.h	7
lib/dictBuilder/../common/error_private.h	1
lib/dictBuilder/zdict.c	8
lib/common/xxhash.h	16
lib/dictBuilder/../common/bits.h	2
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/mem.h	19
lib/compress/../common/bits.h	7
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/error_private.h	3
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/threading.c	4
lib/common/../common/allocations.h	2
lib/common/zstd_common.c	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/decompress/zstd_ddict.c	8
lib/decompress/../common/mem.h	16
lib/decompress/huf_decompress.c	31
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/../legacy/zstd_legacy.h	6
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3

Fuzzer: simple_round_trip

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	2120	51.2%
gold	[1:9]	4	0.09%
yellow	[10:29]	2	0.04%
greenyellow	[30:49]	5	0.12%
lawngreen	50+	2004	48.4%
All colors	4135	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
839	839	1 : View List ['ZSTD_createCDict_advanced']	839	1031	ZSTDMT_initCStream_internal	call site: 00969	/src/zstd/lib/compress/zstdmt_compress.c:1263
835	835	1 : View List ['ZSTD_createCDict_advanced2']	835	835	ZSTD_initLocalDict	call site: 00263	/src/zstd/lib/compress/zstd_compress.c:1263
551	551	2 : View List ['ZSTD_loadZstdDictionary', 'MEM_readLE32.984']	551	883	ZSTD_compress_insertDictionary	call site: 00414	/src/zstd/lib/compress/zstd_compress.c:5166
464	464	1 : View List ['HUF_compress1X_usingCTable_internal_default']	464	464	HUF_compress1X_usingCTable_internal	call site: 01758	/src/zstd/lib/compress/huf_compress.c:1143
374	374	1 : View List ['ZSTD_resetCCtx_usingCDict']	374	374	ZSTD_compressBegin_internal	call site: 01020	/src/zstd/lib/compress/zstd_compress.c:5206
332	332	1 : View List ['HUF_readStats_body_default']	332	332	HUF_readStats_wksp	call site: 00663	/src/zstd/lib/common/entropy_common.c:334
329	329	1 : View List ['ZSTD_decompressSequencesSplitLitBuffer_default']	329	329	ZSTD_decompressSequencesSplitLitBuffer	call site: 03999	/src/zstd/lib/decompress/zstd_decompress_block.c:1965
310	310	2 : View List ['ZSTDMT_resize', 'ERR_isError.2987']	1159	1379	ZSTDMT_initCStream_internal	call site: 00937	/src/zstd/lib/compress/zstdmt_compress.c:1247
235	235	1 : View List ['FSE_decompress_wksp_body_default']	235	235	FSE_decompress_wksp_bmi2	call site: 00665	/src/zstd/lib/common/fse_decompress.c:307
133	133	1 : View List ['ZSTDMT_updateCParams_whileCompressing']	133	3405	ZSTD_compressStream2	call site: 01145	/src/zstd/lib/compress/zstd_compress.c:6434
89	89	1 : View List ['ZSTD_DUBT_findBetterDictMatch']	89	89	ZSTD_DUBT_findBestMatch	call site: 00000	/src/zstd/lib/compress/zstd_lazy.c:373
68	68	1 : View List ['ZSTD_encodeSequences_default']	68	68	ZSTD_encodeSequences	call site: 01839	/src/zstd/lib/compress/zstd_compress_sequences.c:428

Runtime coverage analysis

Covered functions

704

Functions that are reachable but not covered

106

Reachable functions

596

Percentage of reachable functions covered

82.21%

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
tests/fuzz/simple_round_trip.c	3
tests/fuzz/fuzz_helpers.c	2
lib/compress/zstd_compress.c	147
tests/fuzz/fuzz_data_producer.c	8
lib/compress/../common/allocations.h	3
lib/compress/../common/zstd_internal.h	5
lib/compress/../common/cpu.h	3
lib/compress/zstd_cwksp.h	35
lib/compress/../common/error_private.h	1
lib/decompress/zstd_decompress.c	37
lib/decompress/../common/allocations.h	2
lib/decompress/../common/zstd_internal.h	3
lib/decompress/../common/cpu.h	3
tests/fuzz/zstd_helpers.c	6
lib/compress/../common/mem.h	19
lib/compress/zstd_compress_internal.h	45
lib/compress/../common/bits.h	7
lib/common/zstd_common.c	3
lib/common/error_private.h	3
lib/common/error_private.c	1
tests/fuzz/../../contrib/externalSequenceProducer/sequence_producer.c	1
lib/compress/../common/compiler.h	1
lib/compress/zstd_ldm.c	20
lib/common/xxhash.h	16
lib/compress/zstd_fast.c	3
lib/compress/zstd_double_fast.c	3
lib/compress/zstd_lazy.c	4
lib/compress/zstd_opt.c	2
lib/compress/huf_compress.c	37
lib/common/entropy_common.c	9
lib/common/fse_decompress.c	4
lib/common/mem.h	10
lib/common/bits.h	3
lib/common/bitstream.h	4
lib/common/fse.h	3
lib/compress/fse_compress.c	12
lib/compress/zstdmt_compress.c	51
lib/common/pool.c	9
lib/common/../common/allocations.h	2
lib/common/threading.c	4
lib/compress/zstd_preSplit.c	8
lib/compress/hist.c	5
lib/compress/zstd_compress_superblock.c	13
lib/compress/../common/bitstream.h	6
lib/compress/../common/fse.h	5
lib/compress/zstd_compress_sequences.c	11
lib/compress/zstd_compress_literals.c	5
lib/decompress/../common/error_private.h	1
lib/decompress/zstd_ddict.c	5
lib/decompress/../legacy/zstd_legacy.h	6
lib/decompress/../common/mem.h	16
lib/legacy/zstd_v01.c	57
lib/legacy/../common/error_private.h	1
lib/legacy/zstd_v02.c	46
lib/legacy/zstd_v03.c	46
lib/legacy/zstd_v04.c	55
lib/legacy/zstd_v05.c	66
lib/legacy/../common/mem.h	14
lib/legacy/zstd_v06.c	77
lib/legacy/zstd_v07.c	87
lib/decompress/huf_decompress.c	31
lib/decompress/zstd_decompress_block.c	32
lib/decompress/../common/bits.h	3
lib/decompress/zstd_decompress_internal.h	1
lib/decompress/../common/bitstream.h	5
lib/decompress/../common/compiler.h	3