Skip to content

Generate interesting strings in fuzzer #6430

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
tlively merged 1 commit into from
Mar 23, 2024
Merged

Generate interesting strings in fuzzer #6430

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
40 changes: 38 additions & 2 deletions src/tools/fuzzing/fuzzing.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2467,10 +2467,46 @@ Expression* TranslateToFuzzReader::makeBasicRef(Type type) {
return null;
}
case HeapType::string: {
auto wtf8 = std::to_string(upTo(1024));
// Construct an interesting WTF-8 string from parts.
std::stringstream wtf8;
bool lastWasLeadingSurrogate = false;
for (size_t i = 0, end = upTo(4); i < end; ++i) {
switch (upTo(6)) {
case 0:
// A simple ascii string.
wtf8 << std::to_string(upTo(1024));
break;
case 1:
// '£'
wtf8 << "\xC2\xA3";
break;
case 2:
// '€'
wtf8 << "\xE2\x82\xAC";
break;
case 3:
// '𐍈'
wtf8 << "\xF0\x90\x8D\x88";
break;
case 4:
// The leading surrogate in '𐍈'
wtf8 << "\xED\xA0\x80";
lastWasLeadingSurrogate = true;
continue;
case 5:
if (lastWasLeadingSurrogate) {
// Avoid invalid WTF-8.
continue;
}
// The trailing surrogate in '𐍈'
wtf8 << "\xED\xBD\x88";
break;
}
lastWasLeadingSurrogate = false;
}
std::stringstream wtf16;
String::convertWTF8ToWTF16(wtf16, wtf8);
// TODO: Use wtf16.view() once we have C++20.
String::convertWTF8ToWTF16(wtf16, wtf8.str());
return builder.makeStringConst(wtf16.str());
}
case HeapType::stringview_wtf8:
Expand Down