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// Copyright (c) 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/opt/strip_nonsemantic_info_pass.h"
#include <cstring>
#include <vector>
#include "source/opt/instruction.h"
#include "source/opt/ir_context.h"
#include "source/util/string_utils.h"
namespace spvtools {
namespace opt {
Pass::Status StripNonSemanticInfoPass::Process() {
bool modified = false;
std::vector<Instruction*> to_remove;
bool other_uses_for_decorate_string = false;
for (auto& inst : context()->module()->annotations()) {
switch (inst.opcode()) {
case SpvOpDecorateStringGOOGLE:
if (inst.GetSingleWordInOperand(1) == SpvDecorationHlslSemanticGOOGLE ||
inst.GetSingleWordInOperand(1) == SpvDecorationUserTypeGOOGLE) {
to_remove.push_back(&inst);
} else {
other_uses_for_decorate_string = true;
}
break;
case SpvOpMemberDecorateStringGOOGLE:
if (inst.GetSingleWordInOperand(2) == SpvDecorationHlslSemanticGOOGLE ||
inst.GetSingleWordInOperand(2) == SpvDecorationUserTypeGOOGLE) {
to_remove.push_back(&inst);
} else {
other_uses_for_decorate_string = true;
}
break;
case SpvOpDecorateId:
if (inst.GetSingleWordInOperand(1) ==
SpvDecorationHlslCounterBufferGOOGLE) {
to_remove.push_back(&inst);
}
break;
default:
break;
}
}
for (auto& inst : context()->module()->extensions()) {
const std::string ext_name = inst.GetInOperand(0).AsString();
if (ext_name == "SPV_GOOGLE_hlsl_functionality1") {
to_remove.push_back(&inst);
} else if (ext_name == "SPV_GOOGLE_user_type") {
to_remove.push_back(&inst);
} else if (!other_uses_for_decorate_string &&
ext_name == "SPV_GOOGLE_decorate_string") {
to_remove.push_back(&inst);
} else if (ext_name == "SPV_KHR_non_semantic_info") {
to_remove.push_back(&inst);
}
}
// remove any extended inst imports that are non semantic
std::unordered_set<uint32_t> non_semantic_sets;
for (auto& inst : context()->module()->ext_inst_imports()) {
assert(inst.opcode() == SpvOpExtInstImport &&
"Expecting an import of an extension's instruction set.");
const std::string extension_name = inst.GetInOperand(0).AsString();
if (spvtools::utils::starts_with(extension_name, "NonSemantic.")) {
non_semantic_sets.insert(inst.result_id());
to_remove.push_back(&inst);
}
}
// if we removed some non-semantic sets, then iterate over the instructions in
// the module to remove any OpExtInst that referenced those sets
if (!non_semantic_sets.empty()) {
context()->module()->ForEachInst(
[&non_semantic_sets, &to_remove](Instruction* inst) {
if (inst->opcode() == SpvOpExtInst) {
if (non_semantic_sets.find(inst->GetSingleWordInOperand(0)) !=
non_semantic_sets.end()) {
to_remove.push_back(inst);
}
}
},
true);
}
for (auto* inst : to_remove) {
modified = true;
context()->KillInst(inst);
}
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
} // namespace opt
} // namespace spvtools
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