mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
// Copyright (c) 2020 Vasyl Teliman
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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_swap_conditional_branch_operands.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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TransformationSwapConditionalBranchOperands::
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TransformationSwapConditionalBranchOperands(
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const spvtools::fuzz::protobufs::
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TransformationSwapConditionalBranchOperands& message)
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: message_(message) {}
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TransformationSwapConditionalBranchOperands::
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TransformationSwapConditionalBranchOperands(
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const protobufs::InstructionDescriptor& instruction_descriptor,
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uint32_t fresh_id) {
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*message_.mutable_instruction_descriptor() = instruction_descriptor;
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message_.set_fresh_id(fresh_id);
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}
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bool TransformationSwapConditionalBranchOperands::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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const auto* inst =
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FindInstruction(message_.instruction_descriptor(), ir_context);
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return fuzzerutil::IsFreshId(ir_context, message_.fresh_id()) && inst &&
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inst->opcode() == SpvOpBranchConditional;
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}
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void TransformationSwapConditionalBranchOperands::Apply(
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opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
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auto* branch_inst =
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FindInstruction(message_.instruction_descriptor(), ir_context);
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assert(branch_inst);
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auto* block = ir_context->get_instr_block(branch_inst);
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assert(block);
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// Compute the last instruction in the |block| that allows us to insert
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// OpLogicalNot above it.
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auto iter = fuzzerutil::GetIteratorForInstruction(block, branch_inst);
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLogicalNot, iter)) {
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// There might be a merge instruction before OpBranchConditional.
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--iter;
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}
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assert(fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLogicalNot, iter) &&
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"We should now be able to insert SpvOpLogicalNot before |iter|");
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// Get the instruction whose result is used as a condition for
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// OpBranchConditional.
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const auto* condition_inst = ir_context->get_def_use_mgr()->GetDef(
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branch_inst->GetSingleWordInOperand(0));
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assert(condition_inst);
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// We are swapping the labels in OpBranchConditional. This means that we must
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// invert the guard as well. We are using OpLogicalNot for that purpose here.
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iter.InsertBefore(MakeUnique<opt::Instruction>(
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ir_context, SpvOpLogicalNot, condition_inst->type_id(),
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message_.fresh_id(),
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opt::Instruction::OperandList{
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{SPV_OPERAND_TYPE_ID, {condition_inst->result_id()}}}));
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fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
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// Update OpBranchConditional condition operand.
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branch_inst->GetInOperand(0).words[0] = message_.fresh_id();
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// Swap label operands.
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std::swap(branch_inst->GetInOperand(1), branch_inst->GetInOperand(2));
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// Additionally, swap branch weights if present.
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if (branch_inst->NumInOperands() > 3) {
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std::swap(branch_inst->GetInOperand(3), branch_inst->GetInOperand(4));
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}
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// Make sure the changes are analyzed.
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ir_context->InvalidateAnalysesExceptFor(
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opt::IRContext::Analysis::kAnalysisNone);
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}
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protobufs::Transformation
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TransformationSwapConditionalBranchOperands::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_swap_conditional_branch_operands() = 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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