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https://github.com/KhronosGroup/SPIRV-Tools
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fcb22ecf0f
Adds a virtual method, GetFreshIds(), to Transformation. Every transformation uses this to indicate which ids in its protobuf message are fresh ids. This means that when replaying a sequence of transformations the replayer can obtain a smallest id that is not in use by the module already and that will not be used by any transformation by necessity. Ids greater than or equal to this id can be used as overflow ids. Fixes #3851.
107 lines
3.8 KiB
C++
107 lines
3.8 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_load.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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namespace spvtools {
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namespace fuzz {
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TransformationLoad::TransformationLoad(
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const spvtools::fuzz::protobufs::TransformationLoad& message)
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: message_(message) {}
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TransformationLoad::TransformationLoad(
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uint32_t fresh_id, uint32_t pointer_id,
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const protobufs::InstructionDescriptor& instruction_to_insert_before) {
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message_.set_fresh_id(fresh_id);
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message_.set_pointer_id(pointer_id);
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*message_.mutable_instruction_to_insert_before() =
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instruction_to_insert_before;
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}
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bool TransformationLoad::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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// The result 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 must exist and have a type.
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auto pointer = ir_context->get_def_use_mgr()->GetDef(message_.pointer_id());
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if (!pointer || !pointer->type_id()) {
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return false;
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}
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// The type must indeed be a pointer type.
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auto pointer_type = ir_context->get_def_use_mgr()->GetDef(pointer->type_id());
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assert(pointer_type && "Type id must be defined.");
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if (pointer_type->opcode() != SpvOpTypePointer) {
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return false;
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}
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// We do not want to allow loading from null or undefined pointers, as it is
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// not clear how punishing the consequences of doing so are from a semantics
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// point of view.
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switch (pointer->opcode()) {
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case SpvOpConstantNull:
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case SpvOpUndef:
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return false;
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default:
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break;
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}
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// Determine which instruction we should be inserting before.
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auto insert_before =
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FindInstruction(message_.instruction_to_insert_before(), ir_context);
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// It must exist, ...
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if (!insert_before) {
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return false;
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}
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// ... and it must be legitimate to insert a store before it.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLoad, insert_before)) {
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return false;
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}
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// The pointer needs to be available at the insertion point.
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return fuzzerutil::IdIsAvailableBeforeInstruction(ir_context, insert_before,
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message_.pointer_id());
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}
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void TransformationLoad::Apply(opt::IRContext* ir_context,
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TransformationContext* /*unused*/) const {
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uint32_t result_type = fuzzerutil::GetPointeeTypeIdFromPointerType(
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ir_context, fuzzerutil::GetTypeId(ir_context, message_.pointer_id()));
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fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
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FindInstruction(message_.instruction_to_insert_before(), ir_context)
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->InsertBefore(MakeUnique<opt::Instruction>(
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ir_context, SpvOpLoad, result_type, message_.fresh_id(),
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opt::Instruction::OperandList(
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{{SPV_OPERAND_TYPE_ID, {message_.pointer_id()}}})));
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ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
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}
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protobufs::Transformation TransformationLoad::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_load() = message_;
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return result;
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}
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std::unordered_set<uint32_t> TransformationLoad::GetFreshIds() const {
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return {message_.fresh_id()};
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}
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} // namespace fuzz
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} // namespace spvtools
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