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// Copyright (c) 2017 Google Inc.
//
// 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/compact_ids_pass.h"
#include <cassert>
#include <unordered_map>
#include "source/opt/ir_context.h"
namespace spvtools {
namespace opt {
namespace {
// Returns the remapped id of |id| from |result_id_mapping|. If the remapped
// id does not exist, adds a new one to |result_id_mapping| and returns it.
uint32_t GetRemappedId(
std::unordered_map<uint32_t, uint32_t>* result_id_mapping, uint32_t id) {
auto it = result_id_mapping->find(id);
if (it == result_id_mapping->end()) {
const uint32_t new_id =
static_cast<uint32_t>(result_id_mapping->size()) + 1;
const auto insertion_result = result_id_mapping->emplace(id, new_id);
it = insertion_result.first;
assert(insertion_result.second);
}
return it->second;
}
} // namespace
Pass::Status CompactIdsPass::Process() {
bool modified = false;
std::unordered_map<uint32_t, uint32_t> result_id_mapping;
// Disable automatic DebugInfo analysis for the life of the CompactIds pass.
// The DebugInfo manager requires the SPIR-V to be valid to run, but this is
// not true at all times in CompactIds as it remaps all ids.
context()->InvalidateAnalyses(IRContext::kAnalysisDebugInfo);
context()->module()->ForEachInst(
[&result_id_mapping, &modified](Instruction* inst) {
auto operand = inst->begin();
while (operand != inst->end()) {
const auto type = operand->type;
if (spvIsIdType(type)) {
assert(operand->words.size() == 1);
uint32_t& id = operand->words[0];
uint32_t new_id = GetRemappedId(&result_id_mapping, id);
if (id != new_id) {
modified = true;
id = new_id;
// Update data cached in the instruction object.
if (type == SPV_OPERAND_TYPE_RESULT_ID) {
inst->SetResultId(id);
} else if (type == SPV_OPERAND_TYPE_TYPE_ID) {
inst->SetResultType(id);
}
}
}
++operand;
}
uint32_t scope_id = inst->GetDebugScope().GetLexicalScope();
if (scope_id != kNoDebugScope) {
uint32_t new_id = GetRemappedId(&result_id_mapping, scope_id);
if (scope_id != new_id) {
inst->UpdateLexicalScope(new_id);
modified = true;
}
}
uint32_t inlinedat_id = inst->GetDebugInlinedAt();
if (inlinedat_id != kNoInlinedAt) {
uint32_t new_id = GetRemappedId(&result_id_mapping, inlinedat_id);
if (inlinedat_id != new_id) {
inst->UpdateDebugInlinedAt(new_id);
modified = true;
}
}
},
true);
if (context()->module()->id_bound() != result_id_mapping.size() + 1) {
modified = true;
context()->module()->SetIdBound(
static_cast<uint32_t>(result_id_mapping.size() + 1));
// There are ids in the feature manager that could now be invalid
context()->ResetFeatureManager();
}
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
} // namespace opt
} // namespace spvtools
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