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// Copyright (c) 2019 Google LLC
//
// 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/fact_manager/constant_uniform_facts.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/uniform_buffer_element_descriptor.h"
namespace spvtools {
namespace fuzz {
namespace fact_manager {
ConstantUniformFacts::ConstantUniformFacts(opt::IRContext* ir_context)
: ir_context_(ir_context) {}
uint32_t ConstantUniformFacts::GetConstantId(
const protobufs::FactConstantUniform& constant_uniform_fact,
uint32_t type_id) const {
auto type = ir_context_->get_type_mgr()->GetType(type_id);
assert(type != nullptr && "Unknown type id.");
const opt::analysis::Constant* known_constant;
if (type->AsInteger()) {
opt::analysis::IntConstant candidate_constant(
type->AsInteger(), GetConstantWords(constant_uniform_fact));
known_constant =
ir_context_->get_constant_mgr()->FindConstant(&candidate_constant);
} else {
assert(
type->AsFloat() &&
"Uniform constant facts are only supported for int and float types.");
opt::analysis::FloatConstant candidate_constant(
type->AsFloat(), GetConstantWords(constant_uniform_fact));
known_constant =
ir_context_->get_constant_mgr()->FindConstant(&candidate_constant);
}
if (!known_constant) {
return 0;
}
return ir_context_->get_constant_mgr()->FindDeclaredConstant(known_constant,
type_id);
}
std::vector<uint32_t> ConstantUniformFacts::GetConstantWords(
const protobufs::FactConstantUniform& constant_uniform_fact) {
std::vector<uint32_t> result;
for (auto constant_word : constant_uniform_fact.constant_word()) {
result.push_back(constant_word);
}
return result;
}
bool ConstantUniformFacts::DataMatches(
const opt::Instruction& constant_instruction,
const protobufs::FactConstantUniform& constant_uniform_fact) {
assert(constant_instruction.opcode() == SpvOpConstant);
std::vector<uint32_t> data_in_constant;
for (uint32_t i = 0; i < constant_instruction.NumInOperands(); i++) {
data_in_constant.push_back(constant_instruction.GetSingleWordInOperand(i));
}
return data_in_constant == GetConstantWords(constant_uniform_fact);
}
std::vector<uint32_t>
ConstantUniformFacts::GetConstantsAvailableFromUniformsForType(
uint32_t type_id) const {
std::vector<uint32_t> result;
std::set<uint32_t> already_seen;
for (auto& fact_and_type_id : facts_and_type_ids_) {
if (fact_and_type_id.second != type_id) {
continue;
}
if (auto constant_id = GetConstantId(fact_and_type_id.first, type_id)) {
if (already_seen.find(constant_id) == already_seen.end()) {
result.push_back(constant_id);
already_seen.insert(constant_id);
}
}
}
return result;
}
std::vector<protobufs::UniformBufferElementDescriptor>
ConstantUniformFacts::GetUniformDescriptorsForConstant(
uint32_t constant_id) const {
std::vector<protobufs::UniformBufferElementDescriptor> result;
auto constant_inst = ir_context_->get_def_use_mgr()->GetDef(constant_id);
assert(constant_inst->opcode() == SpvOpConstant &&
"The given id must be that of a constant");
auto type_id = constant_inst->type_id();
for (auto& fact_and_type_id : facts_and_type_ids_) {
if (fact_and_type_id.second != type_id) {
continue;
}
if (DataMatches(*constant_inst, fact_and_type_id.first)) {
result.emplace_back(
fact_and_type_id.first.uniform_buffer_element_descriptor());
}
}
return result;
}
uint32_t ConstantUniformFacts::GetConstantFromUniformDescriptor(
const protobufs::UniformBufferElementDescriptor& uniform_descriptor) const {
// Consider each fact.
for (auto& fact_and_type : facts_and_type_ids_) {
// Check whether the uniform descriptor associated with the fact matches
// |uniform_descriptor|.
if (UniformBufferElementDescriptorEquals()(
&uniform_descriptor,
&fact_and_type.first.uniform_buffer_element_descriptor())) {
return GetConstantId(fact_and_type.first, fact_and_type.second);
}
}
// No fact associated with the given uniform descriptor was found.
return 0;
}
std::vector<uint32_t>
ConstantUniformFacts::GetTypesForWhichUniformValuesAreKnown() const {
std::vector<uint32_t> result;
for (auto& fact_and_type : facts_and_type_ids_) {
if (std::find(result.begin(), result.end(), fact_and_type.second) ==
result.end()) {
result.push_back(fact_and_type.second);
}
}
return result;
}
bool ConstantUniformFacts::FloatingPointValueIsSuitable(
const protobufs::FactConstantUniform& fact, uint32_t width) {
const uint32_t kFloatWidth = 32;
const uint32_t kDoubleWidth = 64;
if (width != kFloatWidth && width != kDoubleWidth) {
// Only 32- and 64-bit floating-point types are handled.
return false;
}
std::vector<uint32_t> words = GetConstantWords(fact);
if (width == 32) {
float value;
memcpy(&value, words.data(), sizeof(float));
if (!std::isfinite(value)) {
return false;
}
} else {
double value;
memcpy(&value, words.data(), sizeof(double));
if (!std::isfinite(value)) {
return false;
}
}
return true;
}
bool ConstantUniformFacts::MaybeAddFact(
const protobufs::FactConstantUniform& fact) {
// Try to find a unique instruction that declares a variable such that the
// variable is decorated with the descriptor set and binding associated with
// the constant uniform fact.
opt::Instruction* uniform_variable = FindUniformVariable(
fact.uniform_buffer_element_descriptor(), ir_context_, true);
if (!uniform_variable) {
return false;
}
assert(SpvOpVariable == uniform_variable->opcode());
assert(SpvStorageClassUniform == uniform_variable->GetSingleWordInOperand(0));
auto should_be_uniform_pointer_type =
ir_context_->get_type_mgr()->GetType(uniform_variable->type_id());
if (!should_be_uniform_pointer_type->AsPointer()) {
return false;
}
if (should_be_uniform_pointer_type->AsPointer()->storage_class() !=
SpvStorageClassUniform) {
return false;
}
auto should_be_uniform_pointer_instruction =
ir_context_->get_def_use_mgr()->GetDef(uniform_variable->type_id());
auto composite_type =
should_be_uniform_pointer_instruction->GetSingleWordInOperand(1);
auto final_element_type_id = fuzzerutil::WalkCompositeTypeIndices(
ir_context_, composite_type,
fact.uniform_buffer_element_descriptor().index());
if (!final_element_type_id) {
return false;
}
auto final_element_type =
ir_context_->get_type_mgr()->GetType(final_element_type_id);
assert(final_element_type &&
"There should be a type corresponding to this id.");
if (!(final_element_type->AsFloat() || final_element_type->AsInteger())) {
return false;
}
auto width = final_element_type->AsFloat()
? final_element_type->AsFloat()->width()
: final_element_type->AsInteger()->width();
if (final_element_type->AsFloat() &&
!FloatingPointValueIsSuitable(fact, width)) {
return false;
}
auto required_words = (width + 32 - 1) / 32;
if (static_cast<uint32_t>(fact.constant_word().size()) != required_words) {
return false;
}
facts_and_type_ids_.emplace_back(
std::pair<protobufs::FactConstantUniform, uint32_t>(
fact, final_element_type_id));
return true;
}
const std::vector<std::pair<protobufs::FactConstantUniform, uint32_t>>&
ConstantUniformFacts::GetConstantUniformFactsAndTypes() const {
return facts_and_type_ids_;
}
} // namespace fact_manager
} // namespace fuzz
} // namespace spvtools
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