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// Copyright (c) 2020 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 "fuzzer_pass_interchange_signedness_of_integer_operands.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/id_use_descriptor.h"
#include "source/fuzz/transformation_record_synonymous_constants.h"
#include "source/fuzz/transformation_replace_id_with_synonym.h"
namespace spvtools {
namespace fuzz {
FuzzerPassInterchangeSignednessOfIntegerOperands::
FuzzerPassInterchangeSignednessOfIntegerOperands(
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 FuzzerPassInterchangeSignednessOfIntegerOperands::Apply() {
assert(!GetFuzzerContext()->IsWgslCompatible() &&
"Cannot interchange signedness in WGSL");
// Make vector keeping track of all the uses we want to replace.
// This is a vector of pairs, where the first element is an id use descriptor
// identifying the use of a constant id and the second is the id that should
// be used to replace it.
std::vector<std::pair<protobufs::IdUseDescriptor, uint32_t>> uses_to_replace;
for (auto constant : GetIRContext()->GetConstants()) {
uint32_t constant_id = constant->result_id();
// We want to record the synonymity of an integer constant with another
// constant with opposite signedness, and this can only be done if they are
// not irrelevant.
if (GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
constant_id)) {
continue;
}
uint32_t toggled_id =
FindOrCreateToggledIntegerConstant(constant->result_id());
if (!toggled_id) {
// Not an integer constant
continue;
}
assert(!GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
toggled_id) &&
"FindOrCreateToggledConstant can't produce an irrelevant id");
// Record synonymous constants
ApplyTransformation(
TransformationRecordSynonymousConstants(constant_id, toggled_id));
// Find all the uses of the constant and, for each, probabilistically
// decide whether to replace it.
GetIRContext()->get_def_use_mgr()->ForEachUse(
constant_id,
[this, toggled_id, &uses_to_replace](opt::Instruction* use_inst,
uint32_t use_index) -> void {
if (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()
->GetChanceOfInterchangingSignednessOfIntegerOperands())) {
MaybeAddUseToReplace(use_inst, use_index, toggled_id,
&uses_to_replace);
}
});
}
// Replace the ids if it is allowed.
for (auto use_to_replace : uses_to_replace) {
MaybeApplyTransformation(TransformationReplaceIdWithSynonym(
use_to_replace.first, use_to_replace.second));
}
}
uint32_t FuzzerPassInterchangeSignednessOfIntegerOperands::
FindOrCreateToggledIntegerConstant(uint32_t id) {
// |id| must not be a specialization constant because we do not know the value
// of specialization constants.
if (opt::IsSpecConstantInst(
GetIRContext()->get_def_use_mgr()->GetDef(id)->opcode())) {
return 0;
}
auto constant = GetIRContext()->get_constant_mgr()->FindDeclaredConstant(id);
// This pass only toggles integer constants.
if (!constant->AsIntConstant() &&
(!constant->AsVectorConstant() ||
!constant->AsVectorConstant()->component_type()->AsInteger())) {
return 0;
}
if (auto integer = constant->AsIntConstant()) {
auto type = integer->type()->AsInteger();
// Find or create and return the toggled constant.
return FindOrCreateIntegerConstant(std::vector<uint32_t>(integer->words()),
type->width(), !type->IsSigned(), false);
}
// The constant is an integer vector.
// Find the component type.
auto component_type =
constant->AsVectorConstant()->component_type()->AsInteger();
// Find or create the toggled component type.
uint32_t toggled_component_type = FindOrCreateIntegerType(
component_type->width(), !component_type->IsSigned());
// Get the information about the toggled components. We need to extract this
// information now because the analyses might be invalidated, which would make
// the constant and component_type variables invalid.
std::vector<std::vector<uint32_t>> component_words;
for (auto component : constant->AsVectorConstant()->GetComponents()) {
component_words.push_back(component->AsIntConstant()->words());
}
uint32_t width = component_type->width();
bool is_signed = !component_type->IsSigned();
std::vector<uint32_t> toggled_components;
// Find or create the toggled components.
for (auto words : component_words) {
toggled_components.push_back(
FindOrCreateIntegerConstant(words, width, is_signed, false));
}
// Find or create the required toggled vector type.
uint32_t toggled_type = FindOrCreateVectorType(
toggled_component_type, (uint32_t)toggled_components.size());
// Find or create and return the toggled vector constant.
return FindOrCreateCompositeConstant(toggled_components, toggled_type, false);
}
} // namespace fuzz
} // namespace spvtools
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