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// Copyright (c) 2021 Shiyu Liu
//
// 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_wrap_vector_synonym.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/transformation_composite_construct.h"
#include "source/fuzz/transformation_wrap_vector_synonym.h"
namespace spvtools {
namespace fuzz {
FuzzerPassWrapVectorSynonym::FuzzerPassWrapVectorSynonym(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassWrapVectorSynonym::Apply() {
ForEachInstructionWithInstructionDescriptor(
[this](opt::Function* /*unused*/, opt::BasicBlock* /*unused*/,
opt::BasicBlock::iterator instruction_iterator,
const protobufs::InstructionDescriptor& instruction_descriptor)
-> void {
// Randomly decide whether to wrap it to a vector operation.
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfWrappingVectorSynonym())) {
return;
}
// The transformation is not applicable if the instruction has missing
// result id, type id, or is not supported type.
if (!TransformationWrapVectorSynonym::IsInstructionSupported(
GetIRContext(), *instruction_iterator)) {
return;
}
// It must be valid to insert an OpCompositeConstruct instruction
// before |instruction_iterator|.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
SpvOpCompositeConstruct, instruction_iterator)) {
return;
}
// Get the scalar operands from the original instruction.
opt::Instruction* operand1 = GetIRContext()->get_def_use_mgr()->GetDef(
instruction_iterator->GetSingleWordInOperand(0));
opt::Instruction* operand2 = GetIRContext()->get_def_use_mgr()->GetDef(
instruction_iterator->GetSingleWordInOperand(1));
// We need to be able to make a synonym of the scalar operation's result
// id, as well as the operand ids (for example, they cannot be
// irrelevant).
if (!fuzzerutil::CanMakeSynonymOf(GetIRContext(),
*GetTransformationContext(),
*instruction_iterator)) {
return;
}
if (!fuzzerutil::CanMakeSynonymOf(
GetIRContext(), *GetTransformationContext(), *operand1)) {
return;
}
if (!fuzzerutil::CanMakeSynonymOf(
GetIRContext(), *GetTransformationContext(), *operand2)) {
return;
}
// Get a random vector size from 2 to 4.
uint32_t vector_size = GetFuzzerContext()->GetWidthOfWrappingVector();
// Randomly choose a position that target ids should be placed at.
// The position is in range [0, n - 1], where n is the size of the
// vector.
uint32_t position =
GetFuzzerContext()->GetRandomIndexForWrappingVector(vector_size);
// Stores the ids of scalar constants.
std::vector<uint32_t> vec1_components;
std::vector<uint32_t> vec2_components;
// Populate components based on vector type and size.
for (uint32_t i = 0; i < vector_size; ++i) {
if (i == position) {
vec1_components.emplace_back(operand1->result_id());
vec2_components.emplace_back(operand2->result_id());
} else {
vec1_components.emplace_back(
FindOrCreateZeroConstant(operand1->type_id(), true));
vec2_components.emplace_back(
FindOrCreateZeroConstant(operand2->type_id(), true));
}
}
// Add two OpCompositeConstruct to the module with result id returned.
// The added vectors may have different types, for instance if the
// scalar instruction operates on integers with differing sign.
// Add the first OpCompositeConstruct that wraps the id of the first
// operand.
uint32_t result_id1 = GetFuzzerContext()->GetFreshId();
ApplyTransformation(TransformationCompositeConstruct(
FindOrCreateVectorType(operand1->type_id(), vector_size),
vec1_components, instruction_descriptor, result_id1));
// Add the second OpCompositeConstruct that wraps the id of the second
// operand.
uint32_t result_id2 = GetFuzzerContext()->GetFreshId();
ApplyTransformation(TransformationCompositeConstruct(
FindOrCreateVectorType(operand2->type_id(), vector_size),
vec2_components, instruction_descriptor, result_id2));
// The result of the vector instruction that
// TransformationWrapVectorSynonym will create should be a vector of the
// right size, with the scalar instruction's result type as its element
// type. This can be distinct from the types of the operands, if the
// scalar instruction adds two signed integers and stores the result in
// an unsigned id, for example. A transformation is applied to add the
// right type to the module.
FindOrCreateVectorType(instruction_iterator->type_id(), vector_size);
// Apply transformation to do vector operation and add synonym between
// the result vector id and the id of the original instruction.
ApplyTransformation(TransformationWrapVectorSynonym(
instruction_iterator->result_id(), result_id1, result_id2,
GetFuzzerContext()->GetFreshId(), position));
});
}
} // namespace fuzz
} // namespace spvtools
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