[midend-CallGraph]增加调用图分析遍
This commit is contained in:
rain2133
417
src/midend/Pass/Analysis/CallGraphAnalysis.cpp
Normal file
417
src/midend/Pass/Analysis/CallGraphAnalysis.cpp
Normal file
@@ -0,0 +1,417 @@
|
||||
#include "CallGraphAnalysis.h"
|
||||
#include "SysYIRPrinter.h"
|
||||
#include <iostream>
|
||||
#include <stack>
|
||||
#include <unordered_set>
|
||||
|
||||
extern int DEBUG;
|
||||
|
||||
namespace sysy {
|
||||
|
||||
// 静态成员初始化
|
||||
void* CallGraphAnalysisPass::ID = (void*)&CallGraphAnalysisPass::ID;
|
||||
|
||||
// ========== CallGraphAnalysisResult 实现 ==========
|
||||
|
||||
CallGraphAnalysisResult::Statistics CallGraphAnalysisResult::getStatistics() const {
|
||||
Statistics stats = {};
|
||||
stats.totalFunctions = nodes.size();
|
||||
|
||||
size_t totalCallEdges = 0;
|
||||
size_t recursiveFunctions = 0;
|
||||
size_t selfRecursiveFunctions = 0;
|
||||
size_t totalCallers = 0;
|
||||
size_t totalCallees = 0;
|
||||
|
||||
for (const auto& pair : nodes) {
|
||||
const auto& node = pair.second;
|
||||
totalCallEdges += node->callees.size();
|
||||
totalCallers += node->callers.size();
|
||||
totalCallees += node->callees.size();
|
||||
|
||||
if (node->isRecursive) recursiveFunctions++;
|
||||
if (node->isSelfRecursive) selfRecursiveFunctions++;
|
||||
}
|
||||
|
||||
stats.totalCallEdges = totalCallEdges;
|
||||
stats.recursiveFunctions = recursiveFunctions;
|
||||
stats.selfRecursiveFunctions = selfRecursiveFunctions;
|
||||
stats.stronglyConnectedComponents = sccs.size();
|
||||
|
||||
// 计算最大SCC大小
|
||||
size_t maxSCCSize = 0;
|
||||
for (const auto& scc : sccs) {
|
||||
maxSCCSize = std::max(maxSCCSize, scc.size());
|
||||
}
|
||||
stats.maxSCCSize = maxSCCSize;
|
||||
|
||||
// 计算平均值
|
||||
if (stats.totalFunctions > 0) {
|
||||
stats.avgCallersPerFunction = static_cast<double>(totalCallers) / stats.totalFunctions;
|
||||
stats.avgCalleesPerFunction = static_cast<double>(totalCallees) / stats.totalFunctions;
|
||||
}
|
||||
|
||||
return stats;
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::print() const {
|
||||
std::cout << "---- Call Graph Analysis Results for Module ----\n";
|
||||
|
||||
// 打印基本统计信息
|
||||
auto stats = getStatistics();
|
||||
std::cout << " Statistics:\n";
|
||||
std::cout << " Total Functions: " << stats.totalFunctions << "\n";
|
||||
std::cout << " Total Call Edges: " << stats.totalCallEdges << "\n";
|
||||
std::cout << " Recursive Functions: " << stats.recursiveFunctions << "\n";
|
||||
std::cout << " Self-Recursive Functions: " << stats.selfRecursiveFunctions << "\n";
|
||||
std::cout << " Strongly Connected Components: " << stats.stronglyConnectedComponents << "\n";
|
||||
std::cout << " Max SCC Size: " << stats.maxSCCSize << "\n";
|
||||
std::cout << " Avg Callers per Function: " << stats.avgCallersPerFunction << "\n";
|
||||
std::cout << " Avg Callees per Function: " << stats.avgCalleesPerFunction << "\n";
|
||||
|
||||
// 打印拓扑排序结果
|
||||
std::cout << " Topological Order (" << topologicalOrder.size() << "):\n";
|
||||
for (size_t i = 0; i < topologicalOrder.size(); ++i) {
|
||||
std::cout << " " << i << ": " << topologicalOrder[i]->getName() << "\n";
|
||||
}
|
||||
|
||||
// 打印强连通分量
|
||||
if (!sccs.empty()) {
|
||||
std::cout << " Strongly Connected Components:\n";
|
||||
for (size_t i = 0; i < sccs.size(); ++i) {
|
||||
std::cout << " SCC " << i << " (size " << sccs[i].size() << "): ";
|
||||
for (size_t j = 0; j < sccs[i].size(); ++j) {
|
||||
if (j > 0) std::cout << ", ";
|
||||
std::cout << sccs[i][j]->getName();
|
||||
}
|
||||
std::cout << "\n";
|
||||
}
|
||||
}
|
||||
|
||||
// 打印每个函数的详细信息
|
||||
std::cout << " Function Details:\n";
|
||||
for (const auto& pair : nodes) {
|
||||
const auto& node = pair.second;
|
||||
std::cout << " Function: " << node->function->getName();
|
||||
|
||||
if (node->isRecursive) {
|
||||
std::cout << " (Recursive";
|
||||
if (node->isSelfRecursive) std::cout << ", Self";
|
||||
if (node->recursiveDepth >= 0) std::cout << ", Depth=" << node->recursiveDepth;
|
||||
std::cout << ")";
|
||||
}
|
||||
std::cout << "\n";
|
||||
|
||||
if (!node->callers.empty()) {
|
||||
std::cout << " Callers (" << node->callers.size() << "): ";
|
||||
bool first = true;
|
||||
for (Function* caller : node->callers) {
|
||||
if (!first) std::cout << ", ";
|
||||
std::cout << caller->getName();
|
||||
first = false;
|
||||
}
|
||||
std::cout << "\n";
|
||||
}
|
||||
|
||||
if (!node->callees.empty()) {
|
||||
std::cout << " Callees (" << node->callees.size() << "): ";
|
||||
bool first = true;
|
||||
for (Function* callee : node->callees) {
|
||||
if (!first) std::cout << ", ";
|
||||
std::cout << callee->getName();
|
||||
first = false;
|
||||
}
|
||||
std::cout << "\n";
|
||||
}
|
||||
}
|
||||
|
||||
std::cout << "--------------------------------------------------\n";
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::addNode(Function* F) {
|
||||
if (nodes.find(F) == nodes.end()) {
|
||||
nodes[F] = std::make_unique<CallGraphNode>(F);
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::addCallEdge(Function* caller, Function* callee) {
|
||||
// 确保两个函数都有对应的节点
|
||||
addNode(caller);
|
||||
addNode(callee);
|
||||
|
||||
// 添加调用边
|
||||
nodes[caller]->callees.insert(callee);
|
||||
nodes[callee]->callers.insert(caller);
|
||||
|
||||
// 更新统计信息
|
||||
nodes[caller]->totalCallees = nodes[caller]->callees.size();
|
||||
nodes[callee]->totalCallers = nodes[callee]->callers.size();
|
||||
|
||||
// 检查自递归
|
||||
if (caller == callee) {
|
||||
nodes[caller]->isSelfRecursive = true;
|
||||
nodes[caller]->isRecursive = true;
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::computeTopologicalOrder() {
|
||||
topologicalOrder.clear();
|
||||
std::unordered_set<Function*> visited;
|
||||
|
||||
// 对每个未访问的函数进行DFS
|
||||
for (const auto& pair : nodes) {
|
||||
Function* F = pair.first;
|
||||
if (visited.find(F) == visited.end()) {
|
||||
dfsTopological(F, visited, topologicalOrder);
|
||||
}
|
||||
}
|
||||
|
||||
// 反转结果（因为我们在后序遍历中添加）
|
||||
std::reverse(topologicalOrder.begin(), topologicalOrder.end());
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::dfsTopological(Function* F, std::unordered_set<Function*>& visited,
|
||||
std::vector<Function*>& result) {
|
||||
visited.insert(F);
|
||||
|
||||
auto node = getNode(F);
|
||||
if (node) {
|
||||
// 先访问所有被调用的函数
|
||||
for (Function* callee : node->callees) {
|
||||
if (visited.find(callee) == visited.end()) {
|
||||
dfsTopological(callee, visited, result);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 后序遍历：访问完所有子节点后添加当前节点
|
||||
result.push_back(F);
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::computeStronglyConnectedComponents() {
|
||||
tarjanSCC();
|
||||
|
||||
// 为每个函数设置其所属的SCC
|
||||
functionToSCC.clear();
|
||||
for (size_t i = 0; i < sccs.size(); ++i) {
|
||||
for (Function* F : sccs[i]) {
|
||||
functionToSCC[F] = static_cast<int>(i);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::tarjanSCC() {
|
||||
sccs.clear();
|
||||
|
||||
std::vector<int> indices(nodes.size(), -1);
|
||||
std::vector<int> lowlinks(nodes.size(), -1);
|
||||
std::vector<Function*> stack;
|
||||
std::unordered_set<Function*> onStack;
|
||||
int index = 0;
|
||||
|
||||
// 为函数分配索引
|
||||
std::map<Function*, int> functionIndex;
|
||||
int idx = 0;
|
||||
for (const auto& pair : nodes) {
|
||||
functionIndex[pair.first] = idx++;
|
||||
}
|
||||
|
||||
// 对每个未访问的函数运行Tarjan算法
|
||||
for (const auto& pair : nodes) {
|
||||
Function* F = pair.first;
|
||||
int fIdx = functionIndex[F];
|
||||
if (indices[fIdx] == -1) {
|
||||
tarjanDFS(F, index, indices, lowlinks, stack, onStack);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::tarjanDFS(Function* F, int& index, std::vector<int>& indices,
|
||||
std::vector<int>& lowlinks, std::vector<Function*>& stack,
|
||||
std::unordered_set<Function*>& onStack) {
|
||||
// 这里需要函数到索引的映射，简化实现
|
||||
// 在实际实现中应该维护一个全局的函数索引映射
|
||||
static std::map<Function*, int> functionIndex;
|
||||
static int nextIndex = 0;
|
||||
|
||||
if (functionIndex.find(F) == functionIndex.end()) {
|
||||
functionIndex[F] = nextIndex++;
|
||||
}
|
||||
|
||||
int fIdx = functionIndex[F];
|
||||
|
||||
// 确保向量足够大
|
||||
if (fIdx >= static_cast<int>(indices.size())) {
|
||||
indices.resize(fIdx + 1, -1);
|
||||
lowlinks.resize(fIdx + 1, -1);
|
||||
}
|
||||
|
||||
indices[fIdx] = index;
|
||||
lowlinks[fIdx] = index;
|
||||
index++;
|
||||
|
||||
stack.push_back(F);
|
||||
onStack.insert(F);
|
||||
|
||||
auto node = getNode(F);
|
||||
if (node) {
|
||||
for (Function* callee : node->callees) {
|
||||
int calleeIdx = functionIndex[callee];
|
||||
|
||||
// 确保向量足够大
|
||||
if (calleeIdx >= static_cast<int>(indices.size())) {
|
||||
indices.resize(calleeIdx + 1, -1);
|
||||
lowlinks.resize(calleeIdx + 1, -1);
|
||||
}
|
||||
|
||||
if (indices[calleeIdx] == -1) {
|
||||
// 递归访问
|
||||
tarjanDFS(callee, index, indices, lowlinks, stack, onStack);
|
||||
lowlinks[fIdx] = std::min(lowlinks[fIdx], lowlinks[calleeIdx]);
|
||||
} else if (onStack.find(callee) != onStack.end()) {
|
||||
// 后向边
|
||||
lowlinks[fIdx] = std::min(lowlinks[fIdx], indices[calleeIdx]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 如果F是SCC的根
|
||||
if (lowlinks[fIdx] == indices[fIdx]) {
|
||||
std::vector<Function*> scc;
|
||||
Function* w;
|
||||
do {
|
||||
w = stack.back();
|
||||
stack.pop_back();
|
||||
onStack.erase(w);
|
||||
scc.push_back(w);
|
||||
} while (w != F);
|
||||
|
||||
sccs.push_back(std::move(scc));
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisResult::analyzeRecursion() {
|
||||
// 基于SCC分析递归
|
||||
for (const auto& scc : sccs) {
|
||||
if (scc.size() > 1) {
|
||||
// 多函数的SCC，标记为相互递归
|
||||
for (Function* F : scc) {
|
||||
auto* node = getMutableNode(F);
|
||||
if (node) {
|
||||
node->isRecursive = true;
|
||||
node->recursiveDepth = -1; // 相互递归，深度未定义
|
||||
}
|
||||
}
|
||||
} else if (scc.size() == 1) {
|
||||
// 单函数SCC，检查是否自递归
|
||||
Function* F = scc[0];
|
||||
auto* node = getMutableNode(F);
|
||||
if (node && node->callees.count(F) > 0) {
|
||||
node->isSelfRecursive = true;
|
||||
node->isRecursive = true;
|
||||
node->recursiveDepth = -1; // 简化：不计算递归深度
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ========== CallGraphAnalysisPass 实现 ==========
|
||||
|
||||
bool CallGraphAnalysisPass::runOnModule(Module* M, AnalysisManager& AM) {
|
||||
if (DEBUG) {
|
||||
std::cout << "Running Call Graph Analysis on module\n";
|
||||
}
|
||||
|
||||
// 创建分析结果
|
||||
CurrentResult = std::make_unique<CallGraphAnalysisResult>(M);
|
||||
|
||||
// 执行主要分析步骤
|
||||
buildCallGraph(M);
|
||||
CurrentResult->computeTopologicalOrder();
|
||||
CurrentResult->computeStronglyConnectedComponents();
|
||||
CurrentResult->analyzeRecursion();
|
||||
|
||||
if (DEBUG) {
|
||||
CurrentResult->print();
|
||||
}
|
||||
|
||||
return false; // 分析遍不修改IR
|
||||
}
|
||||
|
||||
void CallGraphAnalysisPass::buildCallGraph(Module* M) {
|
||||
// 1. 为所有函数创建节点（包括声明但未定义的函数）
|
||||
for (auto& pair : M->getFunctions()) {
|
||||
Function* F = pair.second.get();
|
||||
if (!isLibraryFunction(F) && !isIntrinsicFunction(F)) {
|
||||
CurrentResult->addNode(F);
|
||||
}
|
||||
}
|
||||
|
||||
// 2. 扫描所有函数的调用关系
|
||||
for (auto& pair : M->getFunctions()) {
|
||||
Function* F = pair.second.get();
|
||||
if (!isLibraryFunction(F) && !isIntrinsicFunction(F)) {
|
||||
scanFunctionCalls(F);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisPass::scanFunctionCalls(Function* F) {
|
||||
// 遍历函数中的所有基本块和指令
|
||||
for (auto& BB : F->getBasicBlocks_NoRange()) {
|
||||
for (auto& I : BB->getInstructions()) {
|
||||
if (CallInst* call = dynamic_cast<CallInst*>(I.get())) {
|
||||
processCallInstruction(call, F);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void CallGraphAnalysisPass::processCallInstruction(CallInst* call, Function* caller) {
|
||||
Function* callee = call->getCallee();
|
||||
|
||||
if (!callee) {
|
||||
// 间接调用，无法静态确定目标函数
|
||||
return;
|
||||
}
|
||||
|
||||
if (isLibraryFunction(callee) || isIntrinsicFunction(callee)) {
|
||||
// 跳过标准库函数和内置函数
|
||||
return;
|
||||
}
|
||||
|
||||
// 添加调用边
|
||||
CurrentResult->addCallEdge(caller, callee);
|
||||
|
||||
// 更新调用点统计
|
||||
auto* node = CurrentResult->getMutableNode(caller);
|
||||
if (node) {
|
||||
node->callSiteCount++;
|
||||
}
|
||||
}
|
||||
|
||||
bool CallGraphAnalysisPass::isLibraryFunction(Function* F) const {
|
||||
std::string name = F->getName();
|
||||
|
||||
// SysY标准库函数
|
||||
return name == "getint" || name == "getch" || name == "getfloat" ||
|
||||
name == "getarray" || name == "getfarray" ||
|
||||
name == "putint" || name == "putch" || name == "putfloat" ||
|
||||
name == "putarray" || name == "putfarray" ||
|
||||
name == "_sysy_starttime" || name == "_sysy_stoptime";
|
||||
}
|
||||
|
||||
bool CallGraphAnalysisPass::isIntrinsicFunction(Function* F) const {
|
||||
std::string name = F->getName();
|
||||
|
||||
// 编译器内置函数（后续可以增加某些内置函数）
|
||||
return name.substr(0, 5) == "llvm." || name.substr(0, 5) == "sysy.";
|
||||
}
|
||||
|
||||
void CallGraphAnalysisPass::printStatistics() const {
|
||||
if (CurrentResult) {
|
||||
CurrentResult->print();
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace sysy
|
||||
Reference in New Issue
Block a user