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// Copyright (c) 2020 Vasyl Teliman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/fuzzer_pass_add_composite_extract.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_composite_extract.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAddCompositeExtract::FuzzerPassAddCompositeExtract(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
FuzzerPassAddCompositeExtract::~FuzzerPassAddCompositeExtract() = default;
void FuzzerPassAddCompositeExtract::Apply() {
std::vector<const protobufs::DataDescriptor*> composite_synonyms;
for (const auto* dd :
GetTransformationContext()->GetFactManager()->GetAllSynonyms()) {
// |dd| must describe a component of a composite.
if (!dd->index().empty()) {
composite_synonyms.push_back(dd);
}
}
// We don't want to invalidate the module every time we apply this
// transformation since rebuilding DominatorAnalysis can be expensive, so we
// collect up the transformations we wish to apply and apply them all later.
std::vector<TransformationCompositeExtract> transformations;
ForEachInstructionWithInstructionDescriptor(
[this, &composite_synonyms, &transformations](
opt::Function* function, opt::BasicBlock* block,
opt::BasicBlock::iterator inst_it,
const protobufs::InstructionDescriptor& instruction_descriptor) {
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCompositeExtract,
inst_it)) {
return;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingCompositeExtract())) {
return;
}
auto available_composites = FindAvailableInstructions(
function, block, inst_it,
[](opt::IRContext* ir_context, opt::Instruction* inst) {
return inst->type_id() && inst->result_id() &&
fuzzerutil::IsCompositeType(
ir_context->get_type_mgr()->GetType(inst->type_id()));
});
std::vector<const protobufs::DataDescriptor*> available_synonyms;
for (const auto* dd : composite_synonyms) {
if (fuzzerutil::IdIsAvailableBeforeInstruction(
GetIRContext(), &*inst_it, dd->object())) {
available_synonyms.push_back(dd);
}
}
if (available_synonyms.empty() && available_composites.empty()) {
return;
}
uint32_t composite_id = 0;
std::vector<uint32_t> indices;
if (available_synonyms.empty() || (!available_composites.empty() &&
GetFuzzerContext()->ChooseEven())) {
const auto* inst =
available_composites[GetFuzzerContext()->RandomIndex(
available_composites)];
composite_id = inst->result_id();
auto type_id = inst->type_id();
do {
uint32_t number_of_members = 0;
const auto* type_inst =
GetIRContext()->get_def_use_mgr()->GetDef(type_id);
assert(type_inst && "Composite instruction has invalid type id");
switch (type_inst->opcode()) {
case SpvOpTypeArray:
number_of_members =
fuzzerutil::GetArraySize(*type_inst, GetIRContext());
break;
case SpvOpTypeVector:
case SpvOpTypeMatrix:
number_of_members = type_inst->GetSingleWordInOperand(1);
break;
case SpvOpTypeStruct:
number_of_members = type_inst->NumInOperands();
break;
default:
assert(false && "|type_inst| is not a composite");
return;
}
if (number_of_members == 0) {
return;
}
indices.push_back(
GetFuzzerContext()->GetRandomCompositeExtractIndex(
number_of_members));
switch (type_inst->opcode()) {
case SpvOpTypeArray:
case SpvOpTypeVector:
case SpvOpTypeMatrix:
type_id = type_inst->GetSingleWordInOperand(0);
break;
case SpvOpTypeStruct:
type_id = type_inst->GetSingleWordInOperand(indices.back());
break;
default:
assert(false && "|type_inst| is not a composite");
return;
}
} while (fuzzerutil::IsCompositeType(
GetIRContext()->get_type_mgr()->GetType(type_id)) &&
GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()
->GetChanceOfGoingDeeperToExtractComposite()));
} else {
const auto* dd = available_synonyms[GetFuzzerContext()->RandomIndex(
available_synonyms)];
composite_id = dd->object();
indices.assign(dd->index().begin(), dd->index().end());
}
assert(composite_id != 0 && !indices.empty() &&
"Composite object should have been chosen correctly");
transformations.emplace_back(instruction_descriptor,
GetFuzzerContext()->GetFreshId(),
composite_id, indices);
});
for (const auto& transformation : transformations) {
ApplyTransformation(transformation);
}
}
} // namespace fuzz
} // namespace spvtools
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