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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/transformation_add_synonym.h"
#include <utility>
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationAddSynonym::TransformationAddSynonym(
protobufs::TransformationAddSynonym message)
: message_(std::move(message)) {}
TransformationAddSynonym::TransformationAddSynonym(
uint32_t result_id,
protobufs::TransformationAddSynonym::SynonymType synonym_type,
uint32_t synonym_fresh_id,
const protobufs::InstructionDescriptor& insert_before) {
message_.set_result_id(result_id);
message_.set_synonym_type(synonym_type);
message_.set_synonym_fresh_id(synonym_fresh_id);
*message_.mutable_insert_before() = insert_before;
}
bool TransformationAddSynonym::IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const {
assert(protobufs::TransformationAddSynonym::SynonymType_IsValid(
message_.synonym_type()) &&
"Synonym type is invalid");
// |synonym_fresh_id| must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.synonym_fresh_id())) {
return false;
}
// Check that |message_.result_id| is valid.
auto* synonym = ir_context->get_def_use_mgr()->GetDef(message_.result_id());
if (!synonym) {
return false;
}
// Check that we can apply |synonym_type| to |result_id|.
if (!IsInstructionValid(ir_context, transformation_context, synonym,
message_.synonym_type())) {
return false;
}
// Check that |insert_before| is valid.
auto* insert_before_inst =
FindInstruction(message_.insert_before(), ir_context);
if (!insert_before_inst) {
return false;
}
const auto* insert_before_inst_block =
ir_context->get_instr_block(insert_before_inst);
assert(insert_before_inst_block &&
"|insert_before_inst| must be in some block");
if (transformation_context.GetFactManager()->BlockIsDead(
insert_before_inst_block->id())) {
// We don't create synonyms in dead blocks.
return false;
}
// Check that we can insert |message._synonymous_instruction| before
// |message_.insert_before| instruction. We use OpIAdd to represent some
// instruction that can produce a synonym.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpIAdd,
insert_before_inst)) {
return false;
}
// A constant instruction must be present in the module if required.
if (IsAdditionalConstantRequired(message_.synonym_type()) &&
MaybeGetConstantId(ir_context, transformation_context) == 0) {
return false;
}
// Domination rules must be satisfied.
return fuzzerutil::IdIsAvailableBeforeInstruction(
ir_context, insert_before_inst, message_.result_id());
}
void TransformationAddSynonym::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
// Add a synonymous instruction.
FindInstruction(message_.insert_before(), ir_context)
->InsertBefore(
MakeSynonymousInstruction(ir_context, *transformation_context));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.synonym_fresh_id());
ir_context->InvalidateAnalysesExceptFor(
opt::IRContext::Analysis::kAnalysisNone);
// Propagate PointeeValueIsIrrelevant fact.
const auto* new_synonym_type = ir_context->get_type_mgr()->GetType(
fuzzerutil::GetTypeId(ir_context, message_.synonym_fresh_id()));
assert(new_synonym_type && "New synonym should have a valid type");
if (transformation_context->GetFactManager()->PointeeValueIsIrrelevant(
message_.result_id()) &&
new_synonym_type->AsPointer()) {
transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
message_.synonym_fresh_id());
}
// Mark two ids as synonymous.
transformation_context->GetFactManager()->AddFactDataSynonym(
MakeDataDescriptor(message_.result_id(), {}),
MakeDataDescriptor(message_.synonym_fresh_id(), {}));
}
protobufs::Transformation TransformationAddSynonym::ToMessage() const {
protobufs::Transformation result;
*result.mutable_add_synonym() = message_;
return result;
}
bool TransformationAddSynonym::IsInstructionValid(
opt::IRContext* ir_context,
const TransformationContext& transformation_context, opt::Instruction* inst,
protobufs::TransformationAddSynonym::SynonymType synonym_type) {
// Instruction must have a result id, type id. We skip OpUndef and
// OpConstantNull.
if (!inst || !inst->result_id() || !inst->type_id() ||
inst->opcode() == SpvOpUndef || inst->opcode() == SpvOpConstantNull) {
return false;
}
if (!fuzzerutil::CanMakeSynonymOf(ir_context, transformation_context, inst)) {
return false;
}
switch (synonym_type) {
case protobufs::TransformationAddSynonym::ADD_ZERO:
case protobufs::TransformationAddSynonym::SUB_ZERO:
case protobufs::TransformationAddSynonym::MUL_ONE: {
// The instruction must be either scalar or vector of integers or floats.
const auto* type = ir_context->get_type_mgr()->GetType(inst->type_id());
assert(type && "Instruction's result id is invalid");
if (const auto* vector = type->AsVector()) {
return vector->element_type()->AsInteger() ||
vector->element_type()->AsFloat();
}
return type->AsInteger() || type->AsFloat();
}
case protobufs::TransformationAddSynonym::COPY_OBJECT:
// All checks for OpCopyObject are handled by
// fuzzerutil::CanMakeSynonymOf.
return true;
case protobufs::TransformationAddSynonym::LOGICAL_AND:
case protobufs::TransformationAddSynonym::LOGICAL_OR: {
// The instruction must be either a scalar or a vector of booleans.
const auto* type = ir_context->get_type_mgr()->GetType(inst->type_id());
assert(type && "Instruction's result id is invalid");
return (type->AsVector() && type->AsVector()->element_type()->AsBool()) ||
type->AsBool();
}
default:
assert(false && "Synonym type is not supported");
return false;
}
}
std::unique_ptr<opt::Instruction>
TransformationAddSynonym::MakeSynonymousInstruction(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const {
auto synonym_type_id =
fuzzerutil::GetTypeId(ir_context, message_.result_id());
assert(synonym_type_id && "Synonym has invalid type id");
switch (message_.synonym_type()) {
case protobufs::TransformationAddSynonym::SUB_ZERO:
case protobufs::TransformationAddSynonym::MUL_ONE:
case protobufs::TransformationAddSynonym::ADD_ZERO: {
const auto* synonym_type =
ir_context->get_type_mgr()->GetType(synonym_type_id);
assert(synonym_type && "Synonym has invalid type");
// Compute instruction's opcode based on the type of the operand.
// We have already checked that the operand is either a scalar or a vector
// of either integers or floats.
auto is_integral =
(synonym_type->AsVector() &&
synonym_type->AsVector()->element_type()->AsInteger()) ||
synonym_type->AsInteger();
auto opcode = SpvOpNop;
switch (message_.synonym_type()) {
case protobufs::TransformationAddSynonym::SUB_ZERO:
opcode = is_integral ? SpvOpISub : SpvOpFSub;
break;
case protobufs::TransformationAddSynonym::MUL_ONE:
opcode = is_integral ? SpvOpIMul : SpvOpFMul;
break;
case protobufs::TransformationAddSynonym::ADD_ZERO:
opcode = is_integral ? SpvOpIAdd : SpvOpFAdd;
break;
default:
assert(false && "Unreachable");
break;
}
return MakeUnique<opt::Instruction>(
ir_context, opcode, synonym_type_id, message_.synonym_fresh_id(),
opt::Instruction::OperandList{
{SPV_OPERAND_TYPE_ID, {message_.result_id()}},
{SPV_OPERAND_TYPE_ID,
{MaybeGetConstantId(ir_context, transformation_context)}}});
}
case protobufs::TransformationAddSynonym::COPY_OBJECT:
return MakeUnique<opt::Instruction>(
ir_context, SpvOpCopyObject, synonym_type_id,
message_.synonym_fresh_id(),
opt::Instruction::OperandList{
{SPV_OPERAND_TYPE_ID, {message_.result_id()}}});
case protobufs::TransformationAddSynonym::LOGICAL_OR:
case protobufs::TransformationAddSynonym::LOGICAL_AND: {
auto opcode = message_.synonym_type() ==
protobufs::TransformationAddSynonym::LOGICAL_OR
? SpvOpLogicalOr
: SpvOpLogicalAnd;
return MakeUnique<opt::Instruction>(
ir_context, opcode, synonym_type_id, message_.synonym_fresh_id(),
opt::Instruction::OperandList{
{SPV_OPERAND_TYPE_ID, {message_.result_id()}},
{SPV_OPERAND_TYPE_ID,
{MaybeGetConstantId(ir_context, transformation_context)}}});
}
default:
assert(false && "Unhandled synonym type");
return nullptr;
}
}
uint32_t TransformationAddSynonym::MaybeGetConstantId(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const {
assert(IsAdditionalConstantRequired(message_.synonym_type()) &&
"Synonym type doesn't require an additional constant");
auto synonym_type_id =
fuzzerutil::GetTypeId(ir_context, message_.result_id());
assert(synonym_type_id && "Synonym has invalid type id");
switch (message_.synonym_type()) {
case protobufs::TransformationAddSynonym::ADD_ZERO:
case protobufs::TransformationAddSynonym::SUB_ZERO:
case protobufs::TransformationAddSynonym::LOGICAL_OR:
return fuzzerutil::MaybeGetZeroConstant(
ir_context, transformation_context, synonym_type_id, false);
case protobufs::TransformationAddSynonym::MUL_ONE:
case protobufs::TransformationAddSynonym::LOGICAL_AND: {
auto synonym_type = ir_context->get_type_mgr()->GetType(synonym_type_id);
assert(synonym_type && "Synonym has invalid type");
if (const auto* vector = synonym_type->AsVector()) {
auto element_type_id =
ir_context->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;
if (auto scalar_one_id = fuzzerutil::MaybeGetScalarConstant(
ir_context, transformation_context, {one_word}, element_type_id,
false)) {
return fuzzerutil::MaybeGetCompositeConstant(
ir_context, transformation_context,
std::vector<uint32_t>(vector->element_count(), scalar_one_id),
synonym_type_id, false);
}
return 0;
} else {
return fuzzerutil::MaybeGetScalarConstant(
ir_context, transformation_context,
{synonym_type->AsFloat() ? fuzzerutil::FloatToWord(1) : 1u},
synonym_type_id, false);
}
}
default:
// The assertion at the beginning of the function will fail in the debug
// mode.
return 0;
}
}
bool TransformationAddSynonym::IsAdditionalConstantRequired(
protobufs::TransformationAddSynonym::SynonymType synonym_type) {
switch (synonym_type) {
case protobufs::TransformationAddSynonym::ADD_ZERO:
case protobufs::TransformationAddSynonym::SUB_ZERO:
case protobufs::TransformationAddSynonym::LOGICAL_OR:
case protobufs::TransformationAddSynonym::MUL_ONE:
case protobufs::TransformationAddSynonym::LOGICAL_AND:
return true;
default:
return false;
}
}
std::unordered_set<uint32_t> TransformationAddSynonym::GetFreshIds() const {
return {message_.synonym_fresh_id()};
}
} // namespace fuzz
} // namespace spvtools