Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzzer details

Fuzzer: cxa_demangle_fuzzer

Call tree

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

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 36 57.1%
gold [1:9] 5 7.93%
yellow [10:29] 11 17.4%
greenyellow [30:49] 0 0.0%
lawngreen 50+ 11 17.4%
All colors 63 100

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
55 55 1 :

['(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::parseCtorDtorName((anonymous namespace)::itanium_demangle::Node*&, (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::NameState*)']

55 137 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseUnqualifiedName((anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::NameState*,(anonymousnamespace)::itanium_demangle::Node*,(anonymousnamespace)::itanium_demangle::ModuleName*) call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:2811
42 42 2 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::NodeArrayNode, (anonymous namespace)::itanium_demangle::NodeArray>((anonymous namespace)::itanium_demangle::NodeArray&&)', '(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::EnclosingExpr, char const (&) [11], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [11], (anonymous namespace)::itanium_demangle::Node*&)']

42 110 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseExpr() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4765
40 42 3 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [18], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [18], (anonymous namespace)::itanium_demangle::Node*&)', '(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [22], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [22], (anonymous namespace)::itanium_demangle::Node*&)', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::look(unsigned int) const']

68 270 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
38 100 3 :

['(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::parseSubstitution()', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::parseDecltype()', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::look(unsigned int) const']

38 109 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseUnresolvedType() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:3310
22 22 6 :

['(anonymous namespace)::itanium_demangle::PODSmallVector<(anonymous namespace)::itanium_demangle::ForwardTemplateReference*, 4ul>::empty() const', '(anonymous namespace)::itanium_demangle::OutputBuffer::getCurrentPosition() const', '(anonymous namespace)::itanium_demangle::OutputBuffer::OutputBuffer(char*, unsigned long*)', '(anonymous namespace)::itanium_demangle::OutputBuffer::operator+=(char)', '(anonymous namespace)::itanium_demangle::OutputBuffer::getBuffer()', '(anonymous namespace)::itanium_demangle::Node::print((anonymous namespace)::itanium_demangle::OutputBuffer&) const']

82 82 __cxa_demangle call site: 00012 /src/llvm-project/libcxxabi/src/cxa_demangle.cpp:391
20 254 8 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [34], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [34], (anonymous namespace)::itanium_demangle::Node*&)', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::look(unsigned int) const', '(anonymous namespace)::itanium_demangle::StringView::empty() const', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::parseEncoding()', '(anonymous namespace)::itanium_demangle::StringView::StringView(char const*)', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::consumeIf((anonymous namespace)::itanium_demangle::StringView)', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::consumeIf(char)', '(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::parseNumber(bool)']

20 258 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parse() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:5481
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [27], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [27], (anonymous namespace)::itanium_demangle::Node*&)']

76 276 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [12], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [12], (anonymous namespace)::itanium_demangle::Node*&)']

20 224 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [9], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [9], (anonymous namespace)::itanium_demangle::Node*&)']

20 224 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [14], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [14], (anonymous namespace)::itanium_demangle::Node*&)']

20 224 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [19], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [19], (anonymous namespace)::itanium_demangle::Node*&)']

20 224 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885
20 20 1 :

['(anonymous namespace)::itanium_demangle::Node* (anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::make<(anonymous namespace)::itanium_demangle::SpecialName, char const (&) [34], (anonymous namespace)::itanium_demangle::Node*&>(char const (&) [34], (anonymous namespace)::itanium_demangle::Node*&)']

20 57 (anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() call site: 00000 /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h:4885

Runtime coverage analysis

Covered functions
379
Functions that are reachable but not covered
44
Reachable functions
101
Percentage of reachable functions covered
56.44%
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.
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
/src/llvm-project/libcxxabi/fuzz/cxa_demangle_fuzzer.cpp 1
cxa_demangle.cpp 8
demangle/ItaniumDemangle.h 20
demangle/StringView.h 5
demangle/Utility.h 6

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

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

Func name Functions filename Arg count Args Function depth hitcount instr count bb count cyclomatic complexity Reachable functions Incoming references total cyclomatic complexity Unreached complexity
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseExprPrimary() /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 1 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *'] 6 0 554 64 17 291 0 425 376
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseExpr() /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 1 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *'] 4 0 1300 178 68 159 0 231 162
void(anonymousnamespace)::DumpVisitor::operator()<(anonymousnamespace)::itanium_demangle::NewExpr>((anonymousnamespace)::itanium_demangle::NewExprconst*) /src/llvm-project/libcxxabi/src/cxa_demangle.cpp 2 ['struct.(anonymous namespace)::DumpVisitor *', 'class.(anonymous namespace)::itanium_demangle::NewExpr *'] 5 0 38 3 2 45 0 140 136
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseEncoding() /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 1 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *'] 4 0 335 67 58 112 0 198 133
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseSpecialName() /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 1 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *'] 3 0 463 71 22 97 0 138 94
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseTemplateArgs(bool) /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 2 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *', 'N/A'] 3 0 215 36 37 72 0 144 84
(anonymousnamespace)::itanium_demangle::ReferenceType::printLeft((anonymousnamespace)::itanium_demangle::OutputBuffer&)const /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 2 ['class.(anonymous namespace)::itanium_demangle::ReferenceType *', 'class.(anonymous namespace)::itanium_demangle::OutputBuffer *'] 2 0 181 31 27 35 0 83 65
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseNestedName((anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::NameState*) /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 2 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *', 'struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser<(anonymous namespace)::itanium_demangle::ManglingParser<(anonymous namespace)::DefaultAllocator>, (anonymous namespace)::DefaultAllocator>::NameState *'] 3 0 365 78 30 50 0 84 42
(anonymousnamespace)::itanium_demangle::SizeofParamPackExpr::printLeft((anonymousnamespace)::itanium_demangle::OutputBuffer&)const /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 2 ['class.(anonymous namespace)::itanium_demangle::PointerType *', 'class.(anonymous namespace)::itanium_demangle::OutputBuffer *'] 3 0 62 7 6 36 0 68 40
(anonymousnamespace)::itanium_demangle::AbstractManglingParser<(anonymousnamespace)::itanium_demangle::ManglingParser<(anonymousnamespace)::DefaultAllocator>,(anonymousnamespace)::DefaultAllocator>::parseUnresolvedName(bool) /src/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h 2 ['struct.(anonymous namespace)::itanium_demangle::AbstractManglingParser *', 'N/A'] 3 0 321 63 25 48 0 75 37

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

Functions statically reachable by fuzzers
28.1%
311/1104
Cyclomatic complexity statically reachable by fuzzers
36.6%
1308 / 3572

All functions overview

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

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