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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_synonyms.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_add_synonym.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAddSynonyms::FuzzerPassAddSynonyms(
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 FuzzerPassAddSynonyms::Apply() {
ForEachInstructionWithInstructionDescriptor(
[this](opt::Function* function, opt::BasicBlock* block,
opt::BasicBlock::iterator inst_it,
const protobufs::InstructionDescriptor& instruction_descriptor) {
if (GetTransformationContext()->GetFactManager()->BlockIsDead(
block->id())) {
// Don't create synonyms in dead blocks.
return;
}
// Skip |inst_it| if we can't insert anything above it. OpIAdd is just
// a representative of some instruction that might be produced by the
// transformation.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(spv::Op::OpIAdd,
inst_it)) {
return;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingSynonyms())) {
return;
}
auto synonym_type = GetFuzzerContext()->GetRandomSynonymType();
// Select all instructions that can be used to create a synonym to.
auto available_instructions = FindAvailableInstructions(
function, block, inst_it,
[synonym_type, this](opt::IRContext* ir_context,
opt::Instruction* inst) {
// Check that we can create a synonym to |inst| as described by
// the |synonym_type| and insert it before |inst_it|.
return TransformationAddSynonym::IsInstructionValid(
ir_context, *GetTransformationContext(), inst, synonym_type);
});
if (available_instructions.empty()) {
return;
}
const auto* existing_synonym =
available_instructions[GetFuzzerContext()->RandomIndex(
available_instructions)];
// Make sure the module contains all instructions required to apply the
// transformation.
switch (synonym_type) {
case protobufs::TransformationAddSynonym::ADD_ZERO:
case protobufs::TransformationAddSynonym::SUB_ZERO:
case protobufs::TransformationAddSynonym::LOGICAL_OR:
case protobufs::TransformationAddSynonym::BITWISE_OR:
case protobufs::TransformationAddSynonym::BITWISE_XOR:
// Create a zero constant to be used as an operand of the synonymous
// instruction.
FindOrCreateZeroConstant(existing_synonym->type_id(), false);
break;
case protobufs::TransformationAddSynonym::MUL_ONE:
case protobufs::TransformationAddSynonym::LOGICAL_AND: {
const auto* existing_synonym_type =
GetIRContext()->get_type_mgr()->GetType(
existing_synonym->type_id());
assert(existing_synonym_type && "Instruction has invalid type");
if (const auto* vector = existing_synonym_type->AsVector()) {
auto element_type_id =
GetIRContext()->get_type_mgr()->GetId(vector->element_type());
assert(element_type_id && "Vector's element type is invalid");
auto one_word = vector->element_type()->AsFloat()
? fuzzerutil::FloatToWord(1)
: 1u;
FindOrCreateCompositeConstant(
std::vector<uint32_t>(
vector->element_count(),
FindOrCreateConstant({one_word}, element_type_id, false)),
existing_synonym->type_id(), false);
} else {
FindOrCreateConstant(
{existing_synonym_type->AsFloat() ? fuzzerutil::FloatToWord(1)
: 1u},
existing_synonym->type_id(), false);
}
} break;
default:
// This assertion will fail if some SynonymType is missing from the
// switch statement.
assert(
!TransformationAddSynonym::IsAdditionalConstantRequired(
synonym_type) &&
"|synonym_type| requires an additional constant to be present "
"in the module");
break;
}
ApplyTransformation(TransformationAddSynonym(
existing_synonym->result_id(), synonym_type,
GetFuzzerContext()->GetFreshId(), instruction_descriptor));
});
}
} // namespace fuzz
} // namespace spvtools
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