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/* Copyright (c) 2024-2025 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 "function_basic_block.h"
#include "state_tracker/shader_instruction.h"
#include "module.h"
namespace gpuav {
namespace spirv {
void BasicBlock::ToBinary(std::vector<uint32_t>& out) {
for (const auto& inst : instructions_) {
inst->ToBinary(out);
}
}
void Function::ToBinary(std::vector<uint32_t>& out) {
for (const auto& inst : pre_block_inst_) {
inst->ToBinary(out);
}
for (const auto& block : blocks_) {
block->ToBinary(out);
}
for (const auto& inst : post_block_inst_) {
inst->ToBinary(out);
}
}
BasicBlock::BasicBlock(std::unique_ptr<Instruction> label, Function& function) : function_(function) {
// Used when loading initial SPIR-V
instructions_.emplace_back(std::move(label)); // OpLabel
}
BasicBlock::BasicBlock(Module& module, Function& function) : function_(function) {
uint32_t new_label_id = module.TakeNextId();
CreateInstruction(spv::OpLabel, {new_label_id});
}
uint32_t BasicBlock::GetLabelId() const { return (*(instructions_[0])).ResultId(); }
InstructionIt BasicBlock::GetFirstInjectableInstrution() {
InstructionIt inst_it;
for (inst_it = instructions_.begin(); inst_it != instructions_.end(); ++inst_it) {
if ((*inst_it)->Opcode() != spv::OpLabel && (*inst_it)->Opcode() != spv::OpVariable) {
break;
}
}
return inst_it;
}
InstructionIt BasicBlock::GetLastInjectableInstrution() {
for (auto inst_it = instructions_.rbegin(); inst_it != instructions_.rend(); ++inst_it) {
switch ((*inst_it)->Opcode()) {
case spv::OpBranch:
case spv::OpBranchConditional:
case spv::OpSwitch:
case spv::OpReturn:
case spv::OpReturnValue:
case spv::OpKill:
case spv::OpUnreachable:
case spv::OpTerminateInvocation:
break;
default:
// this works because we know we are not at rend() and there MUST be at least one termination instruction
return (inst_it).base();
}
}
return instructions_.end();
}
void BasicBlock::CreateInstruction(spv::Op opcode, const std::vector<uint32_t>& words, InstructionIt* inst_it) {
const bool add_to_end = inst_it == nullptr;
InstructionIt last_inst = instructions_.end();
if (add_to_end) {
inst_it = &last_inst;
}
// Add 1 as we need to reserve the first word for the opcode/length
auto new_inst = std::make_unique<Instruction>((uint32_t)(words.size() + 1), opcode);
new_inst->Fill(words);
const uint32_t result_id = new_inst->ResultId();
if (result_id != 0) {
function_.inst_map_[result_id] = new_inst.get();
}
InstructionIt it = instructions_.insert(*inst_it, std::move(new_inst));
// update after insertion because allows for easy adding of multiple instructions.
// The caller already knows the added instructions info (since it passed it in).
if (!add_to_end) {
*inst_it = ++it;
}
}
Function::Function(Module& module, std::unique_ptr<Instruction> function_inst, bool is_entry_point)
: module_(module), is_entry_point_(is_entry_point), instrumentation_added_(false) {
// Used when loading initial SPIR-V
pre_block_inst_.emplace_back(std::move(function_inst)); // OpFunction
}
BasicBlockIt Function::InsertNewBlock(BasicBlockIt it) {
it++; // make sure it inserted after
BasicBlockIt new_block_it = blocks_.emplace(it, std::make_unique<BasicBlock>(module_, *this));
return new_block_it;
}
BasicBlock& Function::InsertNewBlockEnd() {
std::unique_ptr<BasicBlock>& new_block = blocks_.emplace_back(std::make_unique<BasicBlock>(module_, *this));
return *new_block;
}
const Instruction* Function::FindInstruction(uint32_t id) const {
auto it = inst_map_.find(id);
return (it == inst_map_.end()) ? nullptr : it->second;
}
void Function::CreateInstruction(spv::Op opcode, const std::vector<uint32_t>& words, uint32_t id) {
for (auto& block : blocks_) {
for (auto inst_it = block->instructions_.begin(); inst_it != block->instructions_.end(); ++inst_it) {
if ((*inst_it)->ResultId() == id) {
inst_it++; // insert after
block->CreateInstruction(opcode, words, &inst_it);
return;
}
}
}
}
// Will not touch control flow logic
void Function::ReplaceAllUsesWith(uint32_t old_word, uint32_t new_word) {
// Shouldn't have to replace anything outside the IDs in function blocks.
//
// This call only needed at a Function block level when not dealing with OpVariable as other instructions won't have to worry
// about decorations/types/etc from pre-Function blocks (such as OpEntryPoint)
assert(FindInstruction(old_word)->Opcode() != spv::OpVariable);
// Because the caller might still be moving around blocks, need to just search all blocks currently
for (auto& block : blocks_) {
for (auto& inst : block->instructions_) {
inst->ReplaceOperandId(old_word, new_word);
}
}
}
} // namespace spirv
} // namespace gpuav
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