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https://github.com/KhronosGroup/SPIRV-Tools
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Some transformations (e.g. TransformationAddFunction) rely on running the validator to decide whether the transformation is applicable. A recent change allowed spirv-fuzz to take validator options, to cater for the case where a module should be considered valid under particular conditions. However, validation during the checking of transformations had no access to these validator options. This change introduced TransformationContext, which currently consists of a fact manager and a set of validator options, but could in the future have other fields corresponding to other objects that it is useful to have access to when applying transformations. Now, instead of checking and applying transformations in the context of a FactManager, a TransformationContext is used. This gives access to the fact manager as before, and also access to the validator options when they are needed.
100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
// Copyright (c) 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/transformation_add_local_variable.h"
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#include "source/fuzz/fuzzer_util.h"
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namespace spvtools {
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namespace fuzz {
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TransformationAddLocalVariable::TransformationAddLocalVariable(
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const spvtools::fuzz::protobufs::TransformationAddLocalVariable& message)
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: message_(message) {}
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TransformationAddLocalVariable::TransformationAddLocalVariable(
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uint32_t fresh_id, uint32_t type_id, uint32_t function_id,
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uint32_t initializer_id, bool value_is_irrelevant) {
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message_.set_fresh_id(fresh_id);
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message_.set_type_id(type_id);
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message_.set_function_id(function_id);
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message_.set_initializer_id(initializer_id);
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message_.set_value_is_irrelevant(value_is_irrelevant);
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}
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bool TransformationAddLocalVariable::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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// The provided id must be fresh.
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if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
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return false;
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}
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// The pointer type id must indeed correspond to a pointer, and it must have
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// function storage class.
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auto type_instruction =
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ir_context->get_def_use_mgr()->GetDef(message_.type_id());
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if (!type_instruction || type_instruction->opcode() != SpvOpTypePointer ||
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type_instruction->GetSingleWordInOperand(0) != SpvStorageClassFunction) {
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return false;
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}
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// The initializer must...
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auto initializer_instruction =
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ir_context->get_def_use_mgr()->GetDef(message_.initializer_id());
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// ... exist, ...
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if (!initializer_instruction) {
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return false;
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}
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// ... be a constant, ...
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if (!spvOpcodeIsConstant(initializer_instruction->opcode())) {
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return false;
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}
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// ... and have the same type as the pointee type.
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if (initializer_instruction->type_id() !=
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type_instruction->GetSingleWordInOperand(1)) {
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return false;
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}
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// The function to which the local variable is to be added must exist.
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return fuzzerutil::FindFunction(ir_context, message_.function_id());
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}
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void TransformationAddLocalVariable::Apply(
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opt::IRContext* ir_context,
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TransformationContext* transformation_context) const {
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fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
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fuzzerutil::FindFunction(ir_context, message_.function_id())
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->begin()
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->begin()
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->InsertBefore(MakeUnique<opt::Instruction>(
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ir_context, SpvOpVariable, message_.type_id(), message_.fresh_id(),
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opt::Instruction::OperandList(
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{{SPV_OPERAND_TYPE_STORAGE_CLASS,
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{
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SpvStorageClassFunction}},
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{SPV_OPERAND_TYPE_ID, {message_.initializer_id()}}})));
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if (message_.value_is_irrelevant()) {
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transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
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message_.fresh_id());
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}
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ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
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}
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protobufs::Transformation TransformationAddLocalVariable::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_add_local_variable() = message_;
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return result;
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}
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} // namespace fuzz
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} // namespace spvtools
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