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https://github.com/KhronosGroup/SPIRV-Tools
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8d4261bc44
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.
116 lines
4.2 KiB
C++
116 lines
4.2 KiB
C++
// Copyright (c) 2019 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_copy_object.h"
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#include "source/fuzz/data_descriptor.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/opt/instruction.h"
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#include "source/util/make_unique.h"
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namespace spvtools {
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namespace fuzz {
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TransformationCopyObject::TransformationCopyObject(
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const protobufs::TransformationCopyObject& message)
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: message_(message) {}
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TransformationCopyObject::TransformationCopyObject(
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uint32_t object,
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const protobufs::InstructionDescriptor& instruction_to_insert_before,
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uint32_t fresh_id) {
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message_.set_object(object);
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*message_.mutable_instruction_to_insert_before() =
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instruction_to_insert_before;
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message_.set_fresh_id(fresh_id);
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}
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bool TransformationCopyObject::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
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// We require the id for the object copy to be unused.
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return false;
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}
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// The id of the object to be copied must exist
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auto object_inst = ir_context->get_def_use_mgr()->GetDef(message_.object());
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if (!object_inst) {
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return false;
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}
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if (!fuzzerutil::CanMakeSynonymOf(ir_context, object_inst)) {
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return false;
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}
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auto insert_before =
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FindInstruction(message_.instruction_to_insert_before(), ir_context);
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if (!insert_before) {
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// The instruction before which the copy should be inserted was not found.
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return false;
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}
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyObject,
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insert_before)) {
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return false;
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}
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// |message_object| must be available directly before the point where we want
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// to add the copy.
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return fuzzerutil::IdIsAvailableBeforeInstruction(ir_context, insert_before,
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message_.object());
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}
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void TransformationCopyObject::Apply(
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opt::IRContext* ir_context,
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TransformationContext* transformation_context) const {
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auto object_inst = ir_context->get_def_use_mgr()->GetDef(message_.object());
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assert(object_inst && "The object to be copied must exist.");
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auto insert_before_inst =
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FindInstruction(message_.instruction_to_insert_before(), ir_context);
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auto destination_block = ir_context->get_instr_block(insert_before_inst);
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assert(destination_block && "The base instruction must be in a block.");
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auto insert_before = fuzzerutil::GetIteratorForInstruction(
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destination_block, insert_before_inst);
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assert(insert_before != destination_block->end() &&
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"There must be an instruction before which the copy can be inserted.");
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opt::Instruction::OperandList operands = {
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{SPV_OPERAND_TYPE_ID, {message_.object()}}};
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insert_before->InsertBefore(MakeUnique<opt::Instruction>(
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ir_context, SpvOp::SpvOpCopyObject, object_inst->type_id(),
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message_.fresh_id(), operands));
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fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
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ir_context->InvalidateAnalysesExceptFor(
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opt::IRContext::Analysis::kAnalysisNone);
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transformation_context->GetFactManager()->AddFactDataSynonym(
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MakeDataDescriptor(message_.object(), {}),
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MakeDataDescriptor(message_.fresh_id(), {}), ir_context);
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if (transformation_context->GetFactManager()->PointeeValueIsIrrelevant(
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message_.object())) {
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transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
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message_.fresh_id());
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}
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}
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protobufs::Transformation TransformationCopyObject::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_copy_object() = 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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