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// Copyright (c) 2017 The Khronos Group Inc.
// Copyright (c) 2017 Valve Corporation
// Copyright (c) 2017 LunarG 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/pass.h"
#include "source/opt/ir_builder.h"
#include "source/opt/iterator.h"
namespace spvtools {
namespace opt {
namespace {
const uint32_t kTypePointerTypeIdInIdx = 1;
} // namespace
Pass::Pass() : consumer_(nullptr), context_(nullptr), already_run_(false) {}
Pass::Status Pass::Run(IRContext* ctx) {
if (already_run_) {
return Status::Failure;
}
already_run_ = true;
context_ = ctx;
Pass::Status status = Process();
context_ = nullptr;
if (status == Status::SuccessWithChange) {
ctx->InvalidateAnalysesExceptFor(GetPreservedAnalyses());
}
if (!(status == Status::Failure || ctx->IsConsistent()))
assert(false && "An analysis in the context is out of date.");
return status;
}
uint32_t Pass::GetPointeeTypeId(const Instruction* ptrInst) const {
const uint32_t ptrTypeId = ptrInst->type_id();
const Instruction* ptrTypeInst = get_def_use_mgr()->GetDef(ptrTypeId);
return ptrTypeInst->GetSingleWordInOperand(kTypePointerTypeIdInIdx);
}
Instruction* Pass::GetBaseType(uint32_t ty_id) {
Instruction* ty_inst = get_def_use_mgr()->GetDef(ty_id);
if (ty_inst->opcode() == SpvOpTypeMatrix) {
uint32_t vty_id = ty_inst->GetSingleWordInOperand(0);
ty_inst = get_def_use_mgr()->GetDef(vty_id);
}
if (ty_inst->opcode() == SpvOpTypeVector) {
uint32_t cty_id = ty_inst->GetSingleWordInOperand(0);
ty_inst = get_def_use_mgr()->GetDef(cty_id);
}
return ty_inst;
}
bool Pass::IsFloat(uint32_t ty_id, uint32_t width) {
Instruction* ty_inst = GetBaseType(ty_id);
if (ty_inst->opcode() != SpvOpTypeFloat) return false;
return ty_inst->GetSingleWordInOperand(0) == width;
}
uint32_t Pass::GetNullId(uint32_t type_id) {
if (IsFloat(type_id, 16)) context()->AddCapability(SpvCapabilityFloat16);
analysis::TypeManager* type_mgr = context()->get_type_mgr();
analysis::ConstantManager* const_mgr = context()->get_constant_mgr();
const analysis::Type* type = type_mgr->GetType(type_id);
const analysis::Constant* null_const = const_mgr->GetConstant(type, {});
Instruction* null_inst =
const_mgr->GetDefiningInstruction(null_const, type_id);
return null_inst->result_id();
}
uint32_t Pass::GenerateCopy(Instruction* object_to_copy, uint32_t new_type_id,
Instruction* insertion_position) {
analysis::TypeManager* type_mgr = context()->get_type_mgr();
analysis::ConstantManager* const_mgr = context()->get_constant_mgr();
uint32_t original_type_id = object_to_copy->type_id();
if (original_type_id == new_type_id) {
return object_to_copy->result_id();
}
InstructionBuilder ir_builder(
context(), insertion_position,
IRContext::kAnalysisInstrToBlockMapping | IRContext::kAnalysisDefUse);
analysis::Type* original_type = type_mgr->GetType(original_type_id);
analysis::Type* new_type = type_mgr->GetType(new_type_id);
if (const analysis::Array* original_array_type = original_type->AsArray()) {
uint32_t original_element_type_id =
type_mgr->GetId(original_array_type->element_type());
analysis::Array* new_array_type = new_type->AsArray();
assert(new_array_type != nullptr && "Can't copy an array to a non-array.");
uint32_t new_element_type_id =
type_mgr->GetId(new_array_type->element_type());
std::vector<uint32_t> element_ids;
const analysis::Constant* length_const =
const_mgr->FindDeclaredConstant(original_array_type->LengthId());
assert(length_const->AsIntConstant());
uint32_t array_length = length_const->AsIntConstant()->GetU32();
for (uint32_t i = 0; i < array_length; i++) {
Instruction* extract = ir_builder.AddCompositeExtract(
original_element_type_id, object_to_copy->result_id(), {i});
element_ids.push_back(
GenerateCopy(extract, new_element_type_id, insertion_position));
}
return ir_builder.AddCompositeConstruct(new_type_id, element_ids)
->result_id();
} else if (const analysis::Struct* original_struct_type =
original_type->AsStruct()) {
analysis::Struct* new_struct_type = new_type->AsStruct();
const std::vector<const analysis::Type*>& original_types =
original_struct_type->element_types();
const std::vector<const analysis::Type*>& new_types =
new_struct_type->element_types();
std::vector<uint32_t> element_ids;
for (uint32_t i = 0; i < original_types.size(); i++) {
Instruction* extract = ir_builder.AddCompositeExtract(
type_mgr->GetId(original_types[i]), object_to_copy->result_id(), {i});
element_ids.push_back(GenerateCopy(extract, type_mgr->GetId(new_types[i]),
insertion_position));
}
return ir_builder.AddCompositeConstruct(new_type_id, element_ids)
->result_id();
} else {
// If we do not have an aggregate type, then we have a problem. Either we
// found multiple instances of the same type, or we are copying to an
// incompatible type. Either way the code is illegal.
assert(false &&
"Don't know how to copy this type. Code is likely illegal.");
}
return 0;
}
} // namespace opt
} // namespace spvtools
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