150 lines
4.3 KiB
C++
150 lines
4.3 KiB
C++
// Copyright (c) 2015-2016 The Khronos Group Inc.
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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/val/basic_block.h"
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#include <algorithm>
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#include <utility>
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#include <vector>
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namespace spvtools {
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namespace val {
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BasicBlock::BasicBlock(uint32_t label_id)
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: id_(label_id),
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immediate_dominator_(nullptr),
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immediate_post_dominator_(nullptr),
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predecessors_(),
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successors_(),
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type_(0),
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reachable_(false),
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label_(nullptr),
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terminator_(nullptr) {}
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void BasicBlock::SetImmediateDominator(BasicBlock* dom_block) {
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immediate_dominator_ = dom_block;
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}
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void BasicBlock::SetImmediatePostDominator(BasicBlock* pdom_block) {
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immediate_post_dominator_ = pdom_block;
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}
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const BasicBlock* BasicBlock::immediate_dominator() const {
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return immediate_dominator_;
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}
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const BasicBlock* BasicBlock::immediate_post_dominator() const {
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return immediate_post_dominator_;
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}
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BasicBlock* BasicBlock::immediate_dominator() { return immediate_dominator_; }
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BasicBlock* BasicBlock::immediate_post_dominator() {
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return immediate_post_dominator_;
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}
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void BasicBlock::RegisterSuccessors(
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const std::vector<BasicBlock*>& next_blocks) {
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for (auto& block : next_blocks) {
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block->predecessors_.push_back(this);
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successors_.push_back(block);
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if (block->reachable_ == false) block->set_reachable(reachable_);
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}
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}
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void BasicBlock::RegisterBranchInstruction(SpvOp branch_instruction) {
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if (branch_instruction == SpvOpUnreachable) reachable_ = false;
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return;
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}
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bool BasicBlock::dominates(const BasicBlock& other) const {
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return (this == &other) ||
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!(other.dom_end() ==
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std::find(other.dom_begin(), other.dom_end(), this));
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}
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bool BasicBlock::postdominates(const BasicBlock& other) const {
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return (this == &other) ||
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!(other.pdom_end() ==
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std::find(other.pdom_begin(), other.pdom_end(), this));
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}
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BasicBlock::DominatorIterator::DominatorIterator() : current_(nullptr) {}
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BasicBlock::DominatorIterator::DominatorIterator(
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const BasicBlock* block,
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std::function<const BasicBlock*(const BasicBlock*)> dominator_func)
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: current_(block), dom_func_(dominator_func) {}
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BasicBlock::DominatorIterator& BasicBlock::DominatorIterator::operator++() {
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if (current_ == dom_func_(current_)) {
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current_ = nullptr;
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} else {
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current_ = dom_func_(current_);
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}
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return *this;
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}
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const BasicBlock::DominatorIterator BasicBlock::dom_begin() const {
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return DominatorIterator(
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this, [](const BasicBlock* b) { return b->immediate_dominator(); });
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}
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BasicBlock::DominatorIterator BasicBlock::dom_begin() {
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return DominatorIterator(
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this, [](const BasicBlock* b) { return b->immediate_dominator(); });
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}
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const BasicBlock::DominatorIterator BasicBlock::dom_end() const {
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return DominatorIterator();
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}
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BasicBlock::DominatorIterator BasicBlock::dom_end() {
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return DominatorIterator();
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}
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const BasicBlock::DominatorIterator BasicBlock::pdom_begin() const {
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return DominatorIterator(
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this, [](const BasicBlock* b) { return b->immediate_post_dominator(); });
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}
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BasicBlock::DominatorIterator BasicBlock::pdom_begin() {
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return DominatorIterator(
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this, [](const BasicBlock* b) { return b->immediate_post_dominator(); });
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}
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const BasicBlock::DominatorIterator BasicBlock::pdom_end() const {
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return DominatorIterator();
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}
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BasicBlock::DominatorIterator BasicBlock::pdom_end() {
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return DominatorIterator();
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}
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bool operator==(const BasicBlock::DominatorIterator& lhs,
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const BasicBlock::DominatorIterator& rhs) {
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return lhs.current_ == rhs.current_;
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}
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bool operator!=(const BasicBlock::DominatorIterator& lhs,
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const BasicBlock::DominatorIterator& rhs) {
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return !(lhs == rhs);
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}
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const BasicBlock*& BasicBlock::DominatorIterator::operator*() {
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return current_;
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}
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} // namespace val
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} // namespace spvtools
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