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// Copyright (c) 2022 Advanced Micro Devices, 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 "fix_func_call_arguments.h"
#include "ir_builder.h"
using namespace spvtools;
using namespace opt;
bool FixFuncCallArgumentsPass::ModuleHasASingleFunction() {
auto funcsNum = get_module()->end() - get_module()->begin();
return funcsNum == 1;
}
Pass::Status FixFuncCallArgumentsPass::Process() {
bool modified = false;
if (ModuleHasASingleFunction()) return Status::SuccessWithoutChange;
for (auto& func : *get_module()) {
func.ForEachInst([this, &modified](Instruction* inst) {
if (inst->opcode() == spv::Op::OpFunctionCall) {
modified |= FixFuncCallArguments(inst);
}
});
}
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
bool FixFuncCallArgumentsPass::FixFuncCallArguments(
Instruction* func_call_inst) {
bool modified = false;
for (uint32_t i = 0; i < func_call_inst->NumInOperands(); ++i) {
Operand& op = func_call_inst->GetInOperand(i);
if (op.type != SPV_OPERAND_TYPE_ID) continue;
Instruction* operand_inst = get_def_use_mgr()->GetDef(op.AsId());
if (operand_inst->opcode() == spv::Op::OpAccessChain) {
uint32_t var_id =
ReplaceAccessChainFuncCallArguments(func_call_inst, operand_inst);
func_call_inst->SetInOperand(i, {var_id});
modified = true;
}
}
if (modified) {
context()->UpdateDefUse(func_call_inst);
}
return modified;
}
uint32_t FixFuncCallArgumentsPass::ReplaceAccessChainFuncCallArguments(
Instruction* func_call_inst, Instruction* operand_inst) {
InstructionBuilder builder(
context(), func_call_inst,
IRContext::kAnalysisDefUse | IRContext::kAnalysisInstrToBlockMapping);
Instruction* next_insert_point = func_call_inst->NextNode();
// Get Variable insertion point
Function* func = context()->get_instr_block(func_call_inst)->GetParent();
Instruction* variable_insertion_point = &*(func->begin()->begin());
Instruction* op_ptr_type = get_def_use_mgr()->GetDef(operand_inst->type_id());
Instruction* op_type =
get_def_use_mgr()->GetDef(op_ptr_type->GetSingleWordInOperand(1));
uint32_t varType = context()->get_type_mgr()->FindPointerToType(
op_type->result_id(), spv::StorageClass::Function);
// Create new variable
builder.SetInsertPoint(variable_insertion_point);
// TODO(1841): Handle id overflow.
Instruction* var =
builder.AddVariable(varType, uint32_t(spv::StorageClass::Function));
// Load access chain to the new variable before function call
builder.SetInsertPoint(func_call_inst);
uint32_t operand_id = operand_inst->result_id();
// TODO(1841): Handle id overflow.
Instruction* load = builder.AddLoad(op_type->result_id(), operand_id);
builder.AddStore(var->result_id(), load->result_id());
// Load return value to the acesschain after function call
builder.SetInsertPoint(next_insert_point);
// TODO(1841): Handle id overflow.
load = builder.AddLoad(op_type->result_id(), var->result_id());
builder.AddStore(operand_id, load->result_id());
return var->result_id();
}
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