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[lib/Fuzzer] make assertions more informative and update comments for the user-supplied mutator

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llvm-svn: 238658
This commit is contained in:
Kostya Serebryany 2015-05-30 17:33:13 +00:00
parent 54e2da2000
commit 444683ece7
2 changed files with 8 additions and 4 deletions
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4
lib/Fuzzer/FuzzerInterface.h
View File

@ -69,12 +69,12 @@ class UserSuppliedFuzzer {
/// Executes the target function on 'Size' bytes of 'Data'.
virtual void TargetFunction(const uint8_t *Data, size_t Size) = 0;
/// Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
/// returns the new size of the data.
/// returns the new size of the data, which should be positive.
virtual size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
return BasicMutate(Data, Size, MaxSize);
}
/// Crosses 'Data1' and 'Data2', writes up to 'MaxOutSize' bytes into Out,
/// returns the number of bytes written.
/// returns the number of bytes written, which should be positive.
virtual size_t CrossOver(const uint8_t *Data1, size_t Size1,
const uint8_t *Data2, size_t Size2,
uint8_t *Out, size_t MaxOutSize) {

8
lib/Fuzzer/FuzzerLoop.cpp
View File

@ -289,7 +289,9 @@ void Fuzzer::MutateAndTestOne(Unit *U) {
size_t Size = U->size();
U->resize(Options.MaxLen);
size_t NewSize = USF.Mutate(U->data(), Size, U->size());
assert(NewSize > 0 && NewSize <= (size_t)Options.MaxLen);
assert(NewSize > 0 && "Mutator returned empty unit");
assert(NewSize <= (size_t)Options.MaxLen &&
"Mutator return overisized unit");
U->resize(NewSize);
RunOneAndUpdateCorpus(*U);
size_t NumTraceBasedMutations = StopTraceRecording();
@ -317,7 +319,9 @@ void Fuzzer::Loop(size_t NumIterations) {
size_t NewSize = USF.CrossOver(
Corpus[J1].data(), Corpus[J1].size(), Corpus[J2].data(),
Corpus[J2].size(), CurrentUnit.data(), CurrentUnit.size());
assert(NewSize > 0 && NewSize <= (size_t)Options.MaxLen);
assert(NewSize > 0 && "CrossOver returned empty unit");
assert(NewSize <= (size_t)Options.MaxLen &&
"CrossOver return overisized unit");
CurrentUnit.resize(NewSize);
MutateAndTestOne(&CurrentUnit);
}