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spirv-fuzz: Implement MaybeApplyTransformation helper function (#3540)

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This function can be used to apply a transformation only if it is
applicable and use it wherever this pattern is used.

Fixes #3530.
This commit is contained in:
Stefano Milizia 2020-07-17 12:01:35 +00:00 committed by GitHub
parent de1ff50f28
commit 7dfd9b8680
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8 changed files with 21 additions and 39 deletions
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11
source/fuzz/fuzzer_pass.h
View File

@ -103,6 +103,17 @@ class FuzzerPass {
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
// A generic helper for applying a transformation only if it is applicable.
// If it is applicable, the transformation is applied and then added to the
// sequence of applied transformations. Otherwise, nothing happens.
void MaybeApplyTransformation(const Transformation& transformation) {
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
}
// Returns the id of an OpTypeBool instruction. If such an instruction does
// not exist, a transformation is applied to add it.
uint32_t FindOrCreateBoolType();

6
source/fuzz/fuzzer_pass_add_dead_blocks.cpp
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@ -59,11 +59,7 @@ void FuzzerPassAddDeadBlocks::Apply() {
}
// Apply all those transformations that are in fact applicable.
for (auto& transformation : candidate_transformations) {
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
MaybeApplyTransformation(transformation);
}
}

7
source/fuzz/fuzzer_pass_add_dead_breaks.cpp
View File

@ -114,12 +114,9 @@ void FuzzerPassAddDeadBreaks::Apply() {
candidate_transformations.erase(candidate_transformations.begin() + index);
// Probabilistically decide whether to try to apply it vs. ignore it, in the
// case that it is applicable.
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext()) &&
GetFuzzerContext()->ChoosePercentage(
if (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingDeadBreak())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
MaybeApplyTransformation(transformation);
}
}
}

9
source/fuzz/fuzzer_pass_add_dead_continues.cpp
View File

@ -80,14 +80,9 @@ void FuzzerPassAddDeadContinues::Apply() {
block.id(), condition_value, std::move(phi_ids));
// Probabilistically decide whether to apply the transformation in the
// case that it is applicable.
if (candidate_transformation.IsApplicable(GetIRContext(),
*GetTransformationContext()) &&
GetFuzzerContext()->ChoosePercentage(
if (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingDeadContinue())) {
candidate_transformation.Apply(GetIRContext(),
GetTransformationContext());
*GetTransformations()->add_transformation() =
candidate_transformation.ToMessage();
MaybeApplyTransformation(candidate_transformation);
}
}
}

9
source/fuzz/fuzzer_pass_interchange_zero_like_constants.cpp
View File

@ -111,13 +111,8 @@ void FuzzerPassInterchangeZeroLikeConstants::Apply() {
// Replace the ids
for (auto use_to_replace : uses_to_replace) {
auto transformation = TransformationReplaceIdWithSynonym(
use_to_replace.first, use_to_replace.second);
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
MaybeApplyTransformation(TransformationReplaceIdWithSynonym(
use_to_replace.first, use_to_replace.second));
}
}
} // namespace fuzz

6
source/fuzz/fuzzer_pass_merge_blocks.cpp
View File

@ -56,11 +56,7 @@ void FuzzerPassMergeBlocks::Apply() {
uint32_t index = GetFuzzerContext()->RandomIndex(potential_transformations);
auto transformation = potential_transformations.at(index);
potential_transformations.erase(potential_transformations.begin() + index);
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
MaybeApplyTransformation(transformation);
}
}

6
source/fuzz/fuzzer_pass_outline_functions.cpp
View File

@ -89,11 +89,7 @@ void FuzzerPassOutlineFunctions::Apply() {
/*new_callee_result_id*/ GetFuzzerContext()->GetFreshId(),
/*input_id_to_fresh_id*/ std::move(input_id_to_fresh_id),
/*output_id_to_fresh_id*/ std::move(output_id_to_fresh_id));
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
MaybeApplyTransformation(transformation);
}
}

6
source/fuzz/fuzzer_pass_split_blocks.cpp
View File

@ -96,11 +96,7 @@ void FuzzerPassSplitBlocks::Apply() {
// If the position we have chosen turns out to be a valid place to split
// the block, we apply the split. Otherwise the block just doesn't get
// split.
if (transformation.IsApplicable(GetIRContext(),
*GetTransformationContext())) {
transformation.Apply(GetIRContext(), GetTransformationContext());
*GetTransformations()->add_transformation() = transformation.ToMessage();
}
MaybeApplyTransformation(transformation);
}
}