mirror of
https://gitee.com/openharmony/third_party_spirv-tools
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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
// Copyright (c) 2020 André Perez Maselco
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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_adjust_branch_weights.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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namespace {
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const uint32_t kBranchWeightForTrueLabelIndex = 3;
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const uint32_t kBranchWeightForFalseLabelIndex = 4;
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} // namespace
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TransformationAdjustBranchWeights::TransformationAdjustBranchWeights(
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protobufs::TransformationAdjustBranchWeights message)
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: message_(std::move(message)) {}
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TransformationAdjustBranchWeights::TransformationAdjustBranchWeights(
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const protobufs::InstructionDescriptor& instruction_descriptor,
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const std::pair<uint32_t, uint32_t>& branch_weights) {
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*message_.mutable_instruction_descriptor() = instruction_descriptor;
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message_.mutable_branch_weights()->set_first(branch_weights.first);
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message_.mutable_branch_weights()->set_second(branch_weights.second);
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}
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bool TransformationAdjustBranchWeights::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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auto instruction =
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FindInstruction(message_.instruction_descriptor(), ir_context);
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if (instruction == nullptr) {
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return false;
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}
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spv::Op opcode = static_cast<spv::Op>(
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message_.instruction_descriptor().target_instruction_opcode());
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assert(instruction->opcode() == opcode &&
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"The located instruction must have the same opcode as in the "
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"descriptor.");
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// Must be an OpBranchConditional instruction.
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if (opcode != spv::Op::OpBranchConditional) {
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return false;
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}
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assert((message_.branch_weights().first() != 0 ||
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message_.branch_weights().second() != 0) &&
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"At least one weight must be non-zero.");
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assert(message_.branch_weights().first() <=
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UINT32_MAX - message_.branch_weights().second() &&
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"The sum of the two weights must not be greater than UINT32_MAX.");
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return true;
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}
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void TransformationAdjustBranchWeights::Apply(
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opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
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auto instruction =
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FindInstruction(message_.instruction_descriptor(), ir_context);
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if (instruction->HasBranchWeights()) {
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instruction->SetOperand(kBranchWeightForTrueLabelIndex,
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{message_.branch_weights().first()});
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instruction->SetOperand(kBranchWeightForFalseLabelIndex,
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{message_.branch_weights().second()});
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} else {
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instruction->AddOperand({SPV_OPERAND_TYPE_OPTIONAL_LITERAL_INTEGER,
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{message_.branch_weights().first()}});
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instruction->AddOperand({SPV_OPERAND_TYPE_OPTIONAL_LITERAL_INTEGER,
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{message_.branch_weights().second()}});
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}
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}
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protobufs::Transformation TransformationAdjustBranchWeights::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_adjust_branch_weights() = message_;
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return result;
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}
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std::unordered_set<uint32_t> TransformationAdjustBranchWeights::GetFreshIds()
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const {
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return std::unordered_set<uint32_t>();
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}
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} // namespace fuzz
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} // namespace spvtools
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