SPIRV-Tools/source/fuzz/transformation_add_constant_scalar.cpp
Alastair Donaldson 620197bd65
Add fuzzer pass that adds useful constructs to a module (#2647)
This new pass adds some basic ingredients to a module on which future
passes are likely to depend, such as boolean constants and some
specfic integer and floating-point values.  This is not a fuzzer pass
in the true sense in that it does not employ randomization, but it
makes sense to define it as a fuzzer pass since it is the first of a
number of transformations passes that the fuzzer will run on a module.
2019-06-04 14:55:00 +01:00

84 lines
2.8 KiB
C++

// 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/transformation_add_constant_scalar.h"
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
namespace transformation {
using opt::IRContext;
bool IsApplicable(const protobufs::TransformationAddConstantScalar& message,
IRContext* context,
const spvtools::fuzz::FactManager& /*unused*/) {
// The id needs to be fresh.
if (!fuzzerutil::IsFreshId(context, message.fresh_id())) {
return false;
}
// The type id for the scalar must exist and be a type.
auto type = context->get_type_mgr()->GetType(message.type_id());
if (!type) {
return false;
}
uint32_t width;
if (type->AsFloat()) {
width = type->AsFloat()->width();
} else if (type->AsInteger()) {
width = type->AsInteger()->width();
} else {
return false;
}
// The number of words is the integer floor of the width.
auto words = (width + 32 - 1) / 32;
// The number of words provided by the transformation needs to match the
// width of the type.
return static_cast<uint32_t>(message.word().size()) == words;
}
void Apply(const protobufs::TransformationAddConstantScalar& message,
IRContext* context, spvtools::fuzz::FactManager* /*unused*/) {
opt::Instruction::OperandList operand_list;
for (auto word : message.word()) {
operand_list.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {word}});
}
context->module()->AddGlobalValue(
MakeUnique<opt::Instruction>(context, SpvOpConstant, message.type_id(),
message.fresh_id(), operand_list));
fuzzerutil::UpdateModuleIdBound(context, message.fresh_id());
// We have added an instruction to the module, so need to be careful about the
// validity of existing analyses.
context->InvalidateAnalysesExceptFor(IRContext::Analysis::kAnalysisNone);
}
protobufs::TransformationAddConstantScalar MakeTransformationAddConstantScalar(
uint32_t fresh_id, uint32_t type_id, std::vector<uint32_t> words) {
protobufs::TransformationAddConstantScalar result;
result.set_fresh_id(fresh_id);
result.set_type_id(type_id);
for (auto word : words) {
result.add_word(word);
}
return result;
}
} // namespace transformation
} // namespace fuzz
} // namespace spvtools