mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
// Copyright (c) 2019 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/opt/generate_webgpu_initializers_pass.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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using inst_iterator = InstructionList::iterator;
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namespace {
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bool NeedsWebGPUInitializer(Instruction* inst) {
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if (inst->opcode() != SpvOpVariable) return false;
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auto storage_class = inst->GetSingleWordOperand(2);
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if (storage_class != SpvStorageClassOutput &&
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storage_class != SpvStorageClassPrivate &&
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storage_class != SpvStorageClassFunction) {
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return false;
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}
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if (inst->NumOperands() > 3) return false;
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return true;
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}
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} // namespace
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Pass::Status GenerateWebGPUInitializersPass::Process() {
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auto* module = context()->module();
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bool changed = false;
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// Handle global/module scoped variables
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for (auto iter = module->types_values_begin();
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iter != module->types_values_end(); ++iter) {
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Instruction* inst = &(*iter);
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if (inst->opcode() == SpvOpConstantNull) {
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null_constant_type_map_[inst->type_id()] = inst;
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seen_null_constants_.insert(inst);
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continue;
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}
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if (!NeedsWebGPUInitializer(inst)) continue;
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changed = true;
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auto* constant_inst = GetNullConstantForVariable(inst);
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if (!constant_inst) return Status::Failure;
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if (seen_null_constants_.find(constant_inst) ==
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seen_null_constants_.end()) {
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constant_inst->InsertBefore(inst);
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null_constant_type_map_[inst->type_id()] = inst;
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seen_null_constants_.insert(inst);
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}
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AddNullInitializerToVariable(constant_inst, inst);
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}
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// Handle local/function scoped variables
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for (auto func = module->begin(); func != module->end(); ++func) {
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auto block = func->entry().get();
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for (auto iter = block->begin();
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iter != block->end() && iter->opcode() == SpvOpVariable; ++iter) {
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Instruction* inst = &(*iter);
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if (!NeedsWebGPUInitializer(inst)) continue;
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changed = true;
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auto* constant_inst = GetNullConstantForVariable(inst);
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if (!constant_inst) return Status::Failure;
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AddNullInitializerToVariable(constant_inst, inst);
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}
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}
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return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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Instruction* GenerateWebGPUInitializersPass::GetNullConstantForVariable(
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Instruction* variable_inst) {
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auto constant_mgr = context()->get_constant_mgr();
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auto* def_use_mgr = get_def_use_mgr();
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auto* ptr_inst = def_use_mgr->GetDef(variable_inst->type_id());
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auto type_id = ptr_inst->GetInOperand(1).words[0];
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if (null_constant_type_map_.find(type_id) == null_constant_type_map_.end()) {
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auto* constant_type = context()->get_type_mgr()->GetType(type_id);
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auto* constant = constant_mgr->GetConstant(constant_type, {});
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return constant_mgr->GetDefiningInstruction(constant, type_id);
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} else {
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return null_constant_type_map_[type_id];
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}
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}
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void GenerateWebGPUInitializersPass::AddNullInitializerToVariable(
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Instruction* constant_inst, Instruction* variable_inst) {
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auto constant_id = constant_inst->result_id();
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variable_inst->AddOperand(Operand(SPV_OPERAND_TYPE_ID, {constant_id}));
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get_def_use_mgr()->AnalyzeInstUse(variable_inst);
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}
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} // namespace opt
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} // namespace spvtools
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