mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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d0c73fcee1
Avoids blanket invalidation of analyses in several transformations, instead updating the def-use manager and instruction to block mapping.
113 lines
4.1 KiB
C++
113 lines
4.1 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(protobufs::TransformationLoad message)
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: message_(std::move(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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auto insert_before =
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FindInstruction(message_.instruction_to_insert_before(), ir_context);
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auto new_instruction = 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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auto new_instruction_ptr = new_instruction.get();
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insert_before->InsertBefore(std::move(new_instruction));
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// Inform the def-use manager about the new instruction and record its basic
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// block.
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ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction_ptr);
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ir_context->set_instr_block(new_instruction_ptr,
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ir_context->get_instr_block(insert_before));
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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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