初步构建分析器，增加控制流分析，实现支配节点计算，支配树构建，支配边界计算，为后续Mem2reg做准备
This commit is contained in:
rain2133
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#include "SysYIRAnalyser.h"
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namespace sysy {
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void ControlFlowAnalysis::init() {
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// 初始化分析器
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auto &functions = pModule->getFunctions();
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for (const auto &function : functions) {
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auto func = function.second.get();
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auto basicBlocks = func->getBasicBlocks();
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for (auto &basicBlock : basicBlocks) {
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blockAnalysisInfo[basicBlock.get()] = new BlockAnalysisInfo();
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blockAnalysisInfo[basicBlock.get()]->clear();
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}
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functionAnalysisInfo[func] = new FunctionAnalysisInfo();
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functionAnalysisInfo[func]->clear();
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}
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}
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void ControlFlowAnalysis::runControlFlowAnalysis() {
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// 运行控制流分析
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clear(); // 清空之前的分析结果
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init(); // 初始化分析器
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computeDomNode();
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computeDomTree();
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computeDomFrontierAllBlk();
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}
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void ControlFlowAnalysis::intersectOP4Dom(std::unordered_set<BasicBlock *> &dom, const std::unordered_set<BasicBlock *> &other) {
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// 计算交集
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for (auto it = dom.begin(); it != dom.end();) {
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if (other.find(*it) == other.end()) {
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// 如果other中没有这个基本块，则从dom中删除
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it = dom.erase(it);
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} else {
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++it;
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}
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}
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}
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auto ControlFlowAnalysis::findCommonDominator(BasicBlock *a, BasicBlock *b) -> BasicBlock * {
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// 查找两个基本块的共同支配结点
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while (a != b) {
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BlockAnalysisInfo* infoA = blockAnalysisInfo[a];
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BlockAnalysisInfo* infoB = blockAnalysisInfo[b];
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// 如果深度不同，则向上移动到直接支配结点
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// TODO：空间换时间倍增优化，优先级较低
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while (infoA->getDomDepth() > infoB->getDomDepth()) a = const_cast<BasicBlock*>(infoA->getIdom());
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while (infoB->getDomDepth() > infoA->getDomDepth()) b = const_cast<BasicBlock*>(infoB->getIdom());
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if (a == b) break;
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a = const_cast<BasicBlock*>(infoA->getIdom());
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b = const_cast<BasicBlock*>(infoB->getIdom());
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}
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return a;
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}
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void ControlFlowAnalysis::computeDomNode(){
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auto &functions = pModule->getFunctions();
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// 分析每个函数内的基本块
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for (const auto &function : functions) {
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auto func = function.second.get();
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auto basicBlocks = func->getBasicBlocks();
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std::unordered_set<BasicBlock *> domSetTmp;
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// 一开始把domSetTmp置为所有block
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auto entry_block = func->getEntryBlock();
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entry_block->setName("Entry");
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blockAnalysisInfo[entry_block]->addDominants(entry_block);
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for (auto &basicBlock : basicBlocks) {
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domSetTmp.emplace(basicBlock.get());
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}
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// 初始化
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for (auto &basicBlock : basicBlocks) {
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if (basicBlock.get() != entry_block) {
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blockAnalysisInfo[basicBlock.get()]->setDominants(domSetTmp);
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// 先把所有block的必经结点都设为N
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}
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}
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// 支配节点计算公式
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//DOM[B]={B}∪ {⋂P∈pred(B) DOM[P]}
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// 其中pred(B)是B的所有前驱结点
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// 迭代计算支配结点，直到不再变化
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// 这里使用迭代法，直到支配结点不再变化
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// TODO：Lengauer-Tarjan 算法可以更高效地计算支配结点
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// 或者按照CFG拓扑序遍历效率更高
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bool changed = true;
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while (changed) {
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changed = false;
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// 循环非start结点
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for (auto &basicBlock : basicBlocks) {
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if (basicBlock.get() != entry_block) {
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auto olddom =
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blockAnalysisInfo[basicBlock.get()]->getDominants();
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std::unordered_set<BasicBlock *> dom =
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blockAnalysisInfo[basicBlock->getPredecessors().front()]->getDominants();
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// 对于每个基本块，计算其支配结点
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// 取其前驱结点的支配结点的交集和自己
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for (auto pred : basicBlock->getPredecessors()) {
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intersectOP4Dom(dom, blockAnalysisInfo[pred]->getDominants());
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}
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dom.emplace(basicBlock.get());
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blockAnalysisInfo[basicBlock.get()]->setDominants(dom);
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if (dom != olddom) {
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changed = true;
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}
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}
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}
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}
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}
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}
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void ControlFlowAnalysis::computeDomTree() {
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// 构造支配树
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auto &functions = pModule->getFunctions();
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for (const auto &function : functions) {
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auto func = function.second.get();
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auto basicBlocks = func->getBasicBlocks();
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auto entry_block = func->getEntryBlock();
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blockAnalysisInfo[entry_block]->setIdom(entry_block);
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blockAnalysisInfo[entry_block]->setDomDepth(0); // 入口块深度为0
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bool changed = true;
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while (changed) {
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changed = false;
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for (auto &basicBlock : basicBlocks) {
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if (basicBlock.get() == entry_block) continue;
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BasicBlock *new_idom = nullptr;
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for (auto pred : basicBlock->getPredecessors()) {
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// 跳过未处理的前驱
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if (blockAnalysisInfo[pred]->getIdom() == nullptr) continue;
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new_idom = (new_idom == nullptr) ? pred : findCommonDominator(new_idom, pred);
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// if (new_idom == nullptr)
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// new_idom = pred;
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// else
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// new_idom = findCommonDominator(new_idom, pred);
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}
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// 更新直接支配节点
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if (new_idom && new_idom != blockAnalysisInfo[basicBlock.get()]->getIdom()) {
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// 移除旧的支配关系
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if (blockAnalysisInfo[basicBlock.get()]->getIdom()) {
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blockAnalysisInfo[const_cast<BasicBlock*>(blockAnalysisInfo[basicBlock.get()]->getIdom())]->removeSdoms(basicBlock.get());
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}
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// 设置新的支配关系
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blockAnalysisInfo[basicBlock.get()]->setIdom(new_idom);
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blockAnalysisInfo[new_idom]->addSdoms(basicBlock.get());
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// 更新深度 = 直接支配节点深度 + 1
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blockAnalysisInfo[basicBlock.get()]->setDomDepth(
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blockAnalysisInfo[new_idom]->getDomDepth() + 1);
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changed = true;
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}
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}
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}
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}
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// for (auto &basicBlock : basicBlocks) {
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// if (basicBlock.get() != func->getEntryBlock()) {
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// auto dominats =
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// blockAnalysisInfo[basicBlock.get()]->getDominants();
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// bool found = false;
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// // 从前驱结点开始寻找直接支配结点
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// std::queue<BasicBlock *> q;
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// for (auto pred : basicBlock->getPredecessors()) {
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// q.push(pred);
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// }
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// // BFS遍历前驱结点，直到找到直接支配结点
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// while (!found && !q.empty()) {
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// auto curr = q.front();
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// q.pop();
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// if (curr == basicBlock.get())
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// continue;
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// if (dominats.count(curr) != 0U) {
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// blockAnalysisInfo[basicBlock.get()]->setIdom(curr);
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// blockAnalysisInfo[curr]->addSdoms(basicBlock.get());
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// found = true;
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// } else {
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// for (auto pred : curr->getPredecessors()) {
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// q.push(pred);
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// }
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// }
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// }
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// }
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// }
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}
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// std::unordered_set<BasicBlock *> ControlFlowAnalysis::computeDomFrontier(BasicBlock *block) {
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// std::unordered_set<BasicBlock *> ret_list;
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// // 计算 localDF
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// for (auto local_successor : block->getSuccessors()) {
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// if (local_successor->getIdom() != block) {
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// ret_list.emplace(local_successor);
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// }
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// }
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// // 计算 upDF
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// for (auto up_successor : block->getSdoms()) {
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// auto childrenDF = computeDF(up_successor);
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// for (auto w : childrenDF) {
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// if (block != w->getIdom() || block == w) {
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// ret_list.emplace(w);
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// }
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// }
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// }
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// return ret_list;
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// }
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void ControlFlowAnalysis::computeDomFrontierAllBlk() {
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auto &functions = pModule->getFunctions();
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for (const auto &function : functions) {
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auto func = function.second.get();
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auto basicBlocks = func->getBasicBlocks();
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// 按支配树深度排序（从深到浅）
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std::vector<BasicBlock *> orderedBlocks;
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for (auto &bb : basicBlocks) {
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orderedBlocks.push_back(bb.get());
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}
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std::sort(orderedBlocks.begin(), orderedBlocks.end(),
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[this](BasicBlock *a, BasicBlock *b) {
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return blockAnalysisInfo[a]->getDomDepth() > blockAnalysisInfo[b]->getDomDepth();
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});
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// 计算支配边界
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for (auto block : orderedBlocks) {
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std::unordered_set<BasicBlock *> df;
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// Local DF: 直接后继中不被当前块支配的
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for (auto succ : block->getSuccessors()) {
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// 当前块不支配该后继（即不是其直接支配节点）
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if (blockAnalysisInfo[succ]->getIdom() != block) {
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df.insert(succ);
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}
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}
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// Up DF: 从支配子树中继承
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for (auto child : blockAnalysisInfo[block]->getSdoms()) {
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for (auto w : blockAnalysisInfo[child]->getDomFrontiers()) {
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// 如果w不被当前块支配
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if (block != blockAnalysisInfo[w]->getIdom()) {
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df.insert(w);
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}
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}
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}
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blockAnalysisInfo[block]->setDomFrontiers(df);
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}
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}
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}
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} // namespace sysy
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@ -0,0 +1,299 @@
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#pragma once
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#include "IR.h"
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namespace sysy {
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// 前向声明
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class Loop;
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// 基本块分析信息类
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class BlockAnalysisInfo {
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public:
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using block_list = std::vector<BasicBlock*>;
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using block_set = std::unordered_set<BasicBlock*>;
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protected:
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// 支配树相关
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int domdepth = 0; ///< 支配节点所在深度
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BasicBlock* idom = nullptr; ///< 直接支配结点
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block_list sdoms; ///< 支配树后继
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block_set dominants; ///< 必经结点集合
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block_set dominant_frontiers; ///< 支配边界
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// 后续添加循环分析相关
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// Loop* loopbelong = nullptr; ///< 所属循环
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// int loopdepth = 0; ///< 循环深度
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public:
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// getterface
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const int getDomDepth() const { return domdepth; }
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const BasicBlock* getIdom() const { return idom; }
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const block_list& getSdoms() const { return sdoms; }
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const block_set& getDominants() const { return dominants; }
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const block_set& getDomFrontiers() const { return dominant_frontiers; }
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// 支配树操作
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void setDomDepth(int depth) { domdepth = depth; }
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void setIdom(BasicBlock* block) { idom = block; }
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void addSdoms(BasicBlock* block) { sdoms.push_back(block); }
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void clearSdoms() { sdoms.clear(); }
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void removeSdoms(BasicBlock* block) {
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sdoms.erase(std::remove(sdoms.begin(), sdoms.end(), block), sdoms.end());
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}
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void addDominants(BasicBlock* block) { dominants.emplace(block); }
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void addDominants(const block_set& blocks) { dominants.insert(blocks.begin(), blocks.end()); }
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void setDominants(BasicBlock* block) {
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dominants.clear();
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addDominants(block);
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}
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void setDominants(const block_set& doms) {
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dominants = doms;
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}
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void setDomFrontiers(const block_set& df) {
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dominant_frontiers = df;
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}
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// TODO：循环分析操作方法
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// 清空所有分析信息
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void clear() {
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domdepth = -1;
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idom = nullptr;
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sdoms.clear();
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dominants.clear();
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dominant_frontiers.clear();
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// loopbelong = nullptr;
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// loopdepth = 0;
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}
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};
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// 函数分析信息类
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class FunctionAnalysisInfo {
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public:
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// 函数属性
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enum FunctionAttribute : uint64_t {
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PlaceHolder = 0x0UL,
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Pure = 0x1UL << 0,
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SelfRecursive = 0x1UL << 1,
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SideEffect = 0x1UL << 2,
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NoPureCauseMemRead = 0x1UL << 3
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};
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// 数据结构
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using Loop_list = std::list<std::unique_ptr<Loop>>;
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using block_loop_map = std::unordered_map<BasicBlock*, Loop*>;
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using value_block_map = std::unordered_map<Value*, BasicBlock*>;
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using value_block_count_map = std::unordered_map<Value*, std::unordered_map<BasicBlock*, int>>;
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// 分析数据
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FunctionAttribute attribute = PlaceHolder; ///< 函数属性
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std::set<Function*> callees; ///< 函数调用集合
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Loop_list loops; ///< 所有循环
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Loop_list topLoops; ///< 顶层循环
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block_loop_map basicblock2Loop; ///< 基本块到循环映射
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std::list<std::unique_ptr<AllocaInst>> indirectAllocas; ///< 间接分配内存
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// 值定义/使用信息
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value_block_map value2AllocBlocks; ///< 值分配位置映射
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value_block_count_map value2DefBlocks; ///< 值定义位置映射
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value_block_count_map value2UseBlocks; ///< 值使用位置映射
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// 函数属性操作
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FunctionAttribute getAttribute() const { return attribute; }
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void setAttribute(FunctionAttribute attr) { attribute = static_cast<FunctionAttribute>(attribute | attr); }
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void clearAttribute() { attribute = PlaceHolder; }
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// 调用关系操作
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void addCallee(Function* callee) { callees.insert(callee); }
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void removeCallee(Function* callee) { callees.erase(callee); }
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void clearCallees() { callees.clear(); }
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// 循环分析操作
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Loop* getLoopOfBasicBlock(BasicBlock* bb) {
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auto it = basicblock2Loop.find(bb);
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return it != basicblock2Loop.end() ? it->second : nullptr;
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}
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void addBBToLoop(BasicBlock* bb, Loop* loop) { basicblock2Loop[bb] = loop; }
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unsigned getLoopDepthByBlock(BasicBlock* bb) {
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Loop* loop = getLoopOfBasicBlock(bb);
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return loop ? loop->getLoopDepth() : 0;
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}
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// 值-块映射操作
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void addValue2AllocBlocks(Value* value, BasicBlock* block) { value2AllocBlocks[value] = block; }
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BasicBlock* getAllocBlockByValue(Value* value) {
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auto it = value2AllocBlocks.find(value);
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return it != value2AllocBlocks.end() ? it->second : nullptr;
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}
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// 值定义/使用操作
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void addValue2DefBlocks(Value* value, BasicBlock* block) { ++value2DefBlocks[value][block]; }
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void addValue2UseBlocks(Value* value, BasicBlock* block) { ++value2UseBlocks[value][block]; }
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// 间接分配操作
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void addIndirectAlloca(AllocaInst* alloca) { indirectAllocas.emplace_back(alloca); }
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// 清空所有分析信息
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void clear() {
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attribute = PlaceHolder;
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callees.clear();
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loops.clear();
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topLoops.clear();
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basicblock2Loop.clear();
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indirectAllocas.clear();
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value2AllocBlocks.clear();
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value2DefBlocks.clear();
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value2UseBlocks.clear();
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}
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};
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// 循环类 - 未实现优化
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class Loop {
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public:
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using block_list = std::vector<BasicBlock *>;
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using block_set = std::unordered_set<BasicBlock *>;
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using Loop_list = std::vector<Loop *>;
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protected:
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Function *parent; // 所属函数
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block_list blocksInLoop; // 循环内的基本块
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BasicBlock *preheaderBlock = nullptr; // 前驱块
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BasicBlock *headerBlock = nullptr; // 循环头
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block_list latchBlock; // 回边块
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block_set exitingBlocks; // 退出块
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block_set exitBlocks; // 退出目标块
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Loop *parentloop = nullptr; // 父循环
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Loop_list subLoops; // 子循环
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size_t loopID; // 循环ID
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unsigned loopDepth; // 循环深度
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Instruction *indCondVar = nullptr; // 循环条件变量
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Instruction::Kind IcmpKind; // 比较类型
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Value *indEnd = nullptr; // 循环结束值
|
||||
AllocaInst *IndPhi = nullptr; // 循环变量
|
||||
|
||||
ConstantValue *indBegin = nullptr; // 循环起始值
|
||||
ConstantValue *indStep = nullptr; // 循环步长
|
||||
|
||||
std::set<GlobalValue *> GlobalValuechange; // 循环内改变的全局变量
|
||||
|
||||
int StepType = 0; // 循环步长类型
|
||||
bool parallelable = false; // 是否可并行
|
||||
|
||||
public:
|
||||
explicit Loop(BasicBlock *header, const std::string &name = "")
|
||||
: headerBlock(header) {
|
||||
blocksInLoop.push_back(header);
|
||||
}
|
||||
|
||||
void setloopID() {
|
||||
static unsigned loopCount = 0;
|
||||
loopCount = loopCount + 1;
|
||||
loopID = loopCount;
|
||||
}
|
||||
ConstantValue* getindBegin() { return indBegin; }
|
||||
ConstantValue* getindStep() { return indStep; }
|
||||
void setindBegin(ConstantValue *indBegin2set) { indBegin = indBegin2set; }
|
||||
void setindStep(ConstantValue *indStep2set) { indStep = indStep2set; }
|
||||
void setStepType(int StepType2Set) { StepType = StepType2Set; }
|
||||
int getStepType() { return StepType; }
|
||||
size_t getLoopID() { return loopID; }
|
||||
|
||||
BasicBlock* getHeader() const { return headerBlock; }
|
||||
BasicBlock* getPreheaderBlock() const { return preheaderBlock; }
|
||||
block_list& getLatchBlocks() { return latchBlock; }
|
||||
block_set& getExitingBlocks() { return exitingBlocks; }
|
||||
block_set& getExitBlocks() { return exitBlocks; }
|
||||
Loop* getParentLoop() const { return parentloop; }
|
||||
void setParentLoop(Loop *parent) { parentloop = parent; }
|
||||
void addBasicBlock(BasicBlock *bb) { blocksInLoop.push_back(bb); }
|
||||
void addSubLoop(Loop *loop) { subLoops.push_back(loop); }
|
||||
void setLoopDepth(unsigned depth) { loopDepth = depth; }
|
||||
block_list& getBasicBlocks() { return blocksInLoop; }
|
||||
Loop_list& getSubLoops() { return subLoops; }
|
||||
unsigned getLoopDepth() const { return loopDepth; }
|
||||
|
||||
bool isLoopContainsBasicBlock(BasicBlock *bb) const {
|
||||
return std::find(blocksInLoop.begin(), blocksInLoop.end(), bb) != blocksInLoop.end();
|
||||
}
|
||||
|
||||
void addExitingBlock(BasicBlock *bb) { exitingBlocks.insert(bb); }
|
||||
void addExitBlock(BasicBlock *bb) { exitBlocks.insert(bb); }
|
||||
void addLatchBlock(BasicBlock *bb) { latchBlock.push_back(bb); }
|
||||
void setPreheaderBlock(BasicBlock *bb) { preheaderBlock = bb; }
|
||||
|
||||
void setIndexCondInstr(Instruction *instr) { indCondVar = instr; }
|
||||
void setIcmpKind(Instruction::Kind kind) { IcmpKind = kind; }
|
||||
Instruction::Kind getIcmpKind() const { return IcmpKind; }
|
||||
|
||||
bool isSimpleLoopInvariant(Value *value) ;
|
||||
|
||||
void setIndEnd(Value *value) { indEnd = value; }
|
||||
void setIndPhi(AllocaInst *phi) { IndPhi = phi; }
|
||||
Value* getIndEnd() const { return indEnd; }
|
||||
AllocaInst* getIndPhi() const { return IndPhi; }
|
||||
Instruction* getIndCondVar() const { return indCondVar; }
|
||||
|
||||
void addGlobalValuechange(GlobalValue *globalvaluechange2add) {
|
||||
GlobalValuechange.insert(globalvaluechange2add);
|
||||
}
|
||||
std::set<GlobalValue *>& getGlobalValuechange() {
|
||||
return GlobalValuechange;
|
||||
}
|
||||
|
||||
void setParallelable(bool flag) { parallelable = flag; }
|
||||
bool isParallelable() const { return parallelable; }
|
||||
};
|
||||
|
||||
class ControlFlowAnalysis {
|
||||
private:
|
||||
Module *pModule; ///< 模块
|
||||
std::unordered_map<BasicBlock*, BlockAnalysisInfo*> blockAnalysisInfo; // 基本块分析信息
|
||||
std::unordered_map<Function*, FunctionAnalysisInfo*> functionAnalysisInfo; // 函数分析信息
|
||||
|
||||
public:
|
||||
explicit ControlFlowAnalysis(Module *pMoudle) : pModule(pMoudle) {}
|
||||
|
||||
void init(); // 初始化分析器
|
||||
void computeDomNode(); // 计算必经结点
|
||||
void computeDomTree(); // 构造支配树
|
||||
// std::unordered_set<BasicBlock *> computeDomFrontier(BasicBlock *block) ; // 计算单个块的支配边界(弃用)
|
||||
void computeDomFrontierAllBlk(); // 计算所有块的支配边界
|
||||
void runControlFlowAnalysis(); // 运行控制流分析(主要是支配树和支配边界)
|
||||
void clear(){
|
||||
for (auto &pair : blockAnalysisInfo) {
|
||||
delete pair.second; // 清理基本块分析信息
|
||||
}
|
||||
blockAnalysisInfo.clear();
|
||||
|
||||
for (auto &pair : functionAnalysisInfo) {
|
||||
delete pair.second; // 清理函数分析信息
|
||||
}
|
||||
functionAnalysisInfo.clear();
|
||||
} // 清空分析结果
|
||||
~ControlFlowAnalysis() {
|
||||
clear(); // 析构时清理所有分析信息
|
||||
}
|
||||
|
||||
private:
|
||||
void intersectOP4Dom(std::unordered_set<BasicBlock *> &dom, const std::unordered_set<BasicBlock *> &other); // 交集运算，
|
||||
BasicBlock* findCommonDominator(BasicBlock *a, BasicBlock *b); // 查找两个基本块的共同支配结点
|
||||
};
|
||||
|
||||
|
||||
// 分析管理器（整合版）
|
||||
class AnalysisManager {
|
||||
|
||||
};
|
||||
|
||||
|
||||
|
||||
|
||||
} // namespace sysy
|
||||
Reference in New Issue
Block a user