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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_permute_function_parameters.h"
#include <vector>
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationPermuteFunctionParameters::
TransformationPermuteFunctionParameters(
protobufs::TransformationPermuteFunctionParameters message)
: message_(std::move(message)) {}
TransformationPermuteFunctionParameters::
TransformationPermuteFunctionParameters(
uint32_t function_id, uint32_t function_type_fresh_id,
const std::vector<uint32_t>& permutation) {
message_.set_function_id(function_id);
message_.set_function_type_fresh_id(function_type_fresh_id);
for (auto index : permutation) {
message_.add_permutation(index);
}
}
bool TransformationPermuteFunctionParameters::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// Check that function exists
const auto* function =
fuzzerutil::FindFunction(ir_context, message_.function_id());
if (!function || function->DefInst().opcode() != SpvOpFunction ||
fuzzerutil::FunctionIsEntryPoint(ir_context, function->result_id())) {
return false;
}
// Check that permutation has valid indices
const auto* function_type = fuzzerutil::GetFunctionType(ir_context, function);
assert(function_type && "Function type is null");
std::vector<uint32_t> permutation(message_.permutation().begin(),
message_.permutation().end());
// Don't take return type into account
auto arg_size = function_type->NumInOperands() - 1;
// |permutation| vector should be equal to the number of arguments
if (static_cast<uint32_t>(permutation.size()) != arg_size) {
return false;
}
// Check that permutation doesn't have duplicated values.
assert(!fuzzerutil::HasDuplicates(permutation) &&
"Permutation has duplicates");
// Check that elements in permutation are in range [0, arg_size - 1].
//
// We must check whether the permutation is empty first because in that case
// |arg_size - 1| will produce |std::numeric_limits<uint32_t>::max()| since
// it's an unsigned integer.
if (!permutation.empty() &&
!fuzzerutil::IsPermutationOfRange(permutation, 0, arg_size - 1)) {
return false;
}
return fuzzerutil::IsFreshId(ir_context, message_.function_type_fresh_id());
}
void TransformationPermuteFunctionParameters::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
// Find the function that will be transformed
auto* function = fuzzerutil::FindFunction(ir_context, message_.function_id());
assert(function && "Can't find the function");
// Adjust OpFunctionParameter instructions
// Collect ids and types from OpFunctionParameter instructions
std::vector<uint32_t> param_id, param_type;
function->ForEachParam(
[¶m_id, ¶m_type](const opt::Instruction* param) {
param_id.push_back(param->result_id());
param_type.push_back(param->type_id());
});
// Permute parameters' ids and types
std::vector<uint32_t> permuted_param_id, permuted_param_type;
for (auto index : message_.permutation()) {
permuted_param_id.push_back(param_id[index]);
permuted_param_type.push_back(param_type[index]);
}
// Set OpFunctionParameter instructions to point to new parameters
size_t i = 0;
function->ForEachParam(
[&i, &permuted_param_id, &permuted_param_type](opt::Instruction* param) {
param->SetResultType(permuted_param_type[i]);
param->SetResultId(permuted_param_id[i]);
++i;
});
// Fix all OpFunctionCall instructions
for (auto* call : fuzzerutil::GetCallers(ir_context, function->result_id())) {
opt::Instruction::OperandList call_operands = {
call->GetInOperand(0) // Function id
};
for (auto index : message_.permutation()) {
// Take function id into account
call_operands.push_back(call->GetInOperand(index + 1));
}
call->SetInOperands(std::move(call_operands));
}
// Update function type.
{
// We use a separate scope here since |old_function_type_inst| might become
// a dangling pointer after the call to the fuzzerutil::UpdateFunctionType.
auto* old_function_type_inst =
fuzzerutil::GetFunctionType(ir_context, function);
assert(old_function_type_inst && "Function must have a valid type");
std::vector<uint32_t> parameter_type_ids;
for (auto index : message_.permutation()) {
// +1 since the first operand to OpTypeFunction is a return type.
parameter_type_ids.push_back(
old_function_type_inst->GetSingleWordInOperand(index + 1));
}
// Change function's type.
fuzzerutil::UpdateFunctionType(
ir_context, function->result_id(), message_.function_type_fresh_id(),
old_function_type_inst->GetSingleWordInOperand(0), parameter_type_ids);
}
// Make sure our changes are analyzed
ir_context->InvalidateAnalysesExceptFor(
opt::IRContext::Analysis::kAnalysisNone);
}
protobufs::Transformation TransformationPermuteFunctionParameters::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_permute_function_parameters() = message_;
return result;
}
std::unordered_set<uint32_t>
TransformationPermuteFunctionParameters::GetFreshIds() const {
return {message_.function_type_fresh_id()};
}
} // namespace fuzz
} // namespace spvtools
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