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[midend-SideEffect]将副作用分析遍重构为Module级别，更新其他优化遍用法，注册到PassMananger中，修改CMakeLists。

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This commit is contained in:
rain2133
2025-08-08 16:25:41 +08:00
parent 126c38a1d9
commit bd23f6154d
6 changed files with 196 additions and 88 deletions
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1
src/midend/CMakeLists.txt
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@@ -10,6 +10,7 @@ add_library(midend_lib STATIC
Pass/Analysis/LoopCharacteristics.cpp
Pass/Analysis/AliasAnalysis.cpp
Pass/Analysis/SideEffectAnalysis.cpp
Pass/Analysis/CallGraphAnalysis.cpp
Pass/Optimize/DCE.cpp
Pass/Optimize/Mem2Reg.cpp
Pass/Optimize/Reg2Mem.cpp

238
src/midend/Pass/Analysis/SideEffectAnalysis.cpp
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@@ -1,5 +1,6 @@
#include "SideEffectAnalysis.h"
#include "AliasAnalysis.h"
#include "CallGraphAnalysis.h"
#include "SysYIRPrinter.h"
#include <iostream>
@@ -110,78 +111,71 @@ const SideEffectInfo* SideEffectAnalysisResult::getKnownFunctionSideEffect(const
// SysYSideEffectAnalysisPass 类的实现
// ======================================================================
bool SysYSideEffectAnalysisPass::runOnFunction(Function* F, AnalysisManager& AM) {
bool SysYSideEffectAnalysisPass::runOnModule(Module* M, AnalysisManager& AM) {
if (DEBUG) {
std::cout << "Running SideEffect analysis on function: " << F->getName() << std::endl;
std::cout << "Running SideEffect analysis on module" << std::endl;
}
// 创建分析结果（构造函数中已经调用了initializeKnownFunctions）
result = std::make_unique<SideEffectAnalysisResult>();
// 获取别名分析结果，在整个函数分析过程中重复使用
aliasAnalysis = AM.getAnalysisResult<AliasAnalysisResult, SysYAliasAnalysisPass>(F);
// 获取调用图分析结果
callGraphAnalysis = AM.getAnalysisResult<CallGraphAnalysisResult, CallGraphAnalysisPass>();
if (!callGraphAnalysis) {
std::cerr << "Warning: CallGraphAnalysis not available, falling back to conservative analysis" << std::endl;
}
// TODO: 重构为Module级别的分析，利用独立的调用图分析
//
// 建议的架构：
// 1. SysYCallGraphAnalysisPass - 独立的调用图分析（Module级别）
// - 构建完整的函数调用关系
// - 提供拓扑排序和强连通分量
// - 识别递归调用模式
//
// 2. SysYSideEffectAnalysisPass - 重构为Module级别
// - 依赖调用图分析结果
// - 按拓扑序分析函数，确保依赖函数先分析
// - 使用不动点算法处理递归函数群
//
// 优势：
// - 调用图可被多个Pass复用（内联、DCE等）
// - 准确的函数间副作用传播
// - 正确处理递归调用
// - 避免保守的"未分析函数"假设
// 分析函数中的每条指令
SideEffectInfo functionSideEffect;
for (auto& BB : F->getBasicBlocks()) {
for (auto& I : BB->getInstructions_Range()) {
Instruction* inst = I.get();
SideEffectInfo instEffect = analyzeInstruction(inst, AM);
// 记录指令的副作用信息
result->setInstructionSideEffect(inst, instEffect);
// 合并到函数级别的副作用信息中
functionSideEffect = functionSideEffect.merge(instEffect);
// 按拓扑序分析函数，确保被调用函数先于调用者分析
if (callGraphAnalysis) {
// 使用调用图的拓扑排序结果
const auto& topOrder = callGraphAnalysis->getTopologicalOrder();
// 处理强连通分量（递归函数群）
const auto& sccs = callGraphAnalysis->getStronglyConnectedComponents();
for (const auto& scc : sccs) {
if (scc.size() > 1) {
// 多个函数的强连通分量，使用不动点算法
analyzeStronglyConnectedComponent(scc, AM);
} else {
// 单个函数，检查是否自递归
Function* func = scc[0];
if (callGraphAnalysis->isSelfRecursive(func)) {
// 自递归函数也需要不动点算法
analyzeStronglyConnectedComponent(scc, AM);
} else {
// 非递归函数，直接分析
SideEffectInfo funcEffect = analyzeFunction(func, AM);
result->setFunctionSideEffect(func, funcEffect);
}
}
}
} else {
// 没有调用图，保守地分析每个函数
for (auto& pair : M->getFunctions()) {
Function* func = pair.second.get();
SideEffectInfo funcEffect = analyzeFunction(func, AM);
result->setFunctionSideEffect(func, funcEffect);
}
}
// 记录函数级别的副作用信息
result->setFunctionSideEffect(F, functionSideEffect);
if (DEBUG) {
std::cout << "---- Side Effect Analysis Results for Function: " << F->getName() << " ----\n";
for (auto& BB : F->getBasicBlocks()) {
for (auto& I : BB->getInstructions_Range()) {
Instruction* inst = I.get();
const auto& info = result->getInstructionSideEffect(inst);
SysYPrinter::printInst(inst);
std::cout << " -> Side Effect: ";
switch (info.type) {
case SideEffectType::NO_SIDE_EFFECT: std::cout << "None"; break;
case SideEffectType::MEMORY_WRITE: std::cout << "Memory Write"; break;
case SideEffectType::FUNCTION_CALL: std::cout << "Function Call"; break;
case SideEffectType::IO_OPERATION: std::cout << "I/O Operation"; break;
case SideEffectType::UNKNOWN: std::cout << "Unknown"; break;
}
std::cout << " (Modifies Global: " << (info.mayModifyGlobal ? "Yes" : "No")
<< ", Modifies Memory: " << (info.mayModifyMemory ? "Yes" : "No")
<< ", Is Pure: " << (info.isPure ? "Yes" : "No") << ")\n";
std::cout << "---- Side Effect Analysis Results for Module ----\n";
for (auto& pair : M->getFunctions()) {
Function* func = pair.second.get();
const auto& funcInfo = result->getFunctionSideEffect(func);
std::cout << "Function " << func->getName() << ": ";
switch (funcInfo.type) {
case SideEffectType::NO_SIDE_EFFECT: std::cout << "No Side Effect"; break;
case SideEffectType::MEMORY_WRITE: std::cout << "Memory Write"; break;
case SideEffectType::FUNCTION_CALL: std::cout << "Function Call"; break;
case SideEffectType::IO_OPERATION: std::cout << "I/O Operation"; break;
case SideEffectType::UNKNOWN: std::cout << "Unknown"; break;
}
std::cout << " (Pure: " << (funcInfo.isPure ? "Yes" : "No")
<< ", Modifies Global: " << (funcInfo.mayModifyGlobal ? "Yes" : "No") << ")\n";
}
std::cout << "------------------------------------------------------------------\n";
std::cout << "--------------------------------------------------\n";
}
return false; // Analysis passes return false since they don't modify the IR
@@ -191,16 +185,100 @@ std::unique_ptr<AnalysisResultBase> SysYSideEffectAnalysisPass::getResult() {
return std::move(result);
}
SideEffectInfo SysYSideEffectAnalysisPass::analyzeInstruction(Instruction* inst, AnalysisManager& AM) {
SideEffectInfo SysYSideEffectAnalysisPass::analyzeFunction(Function* func, AnalysisManager& AM) {
SideEffectInfo functionSideEffect;
// 为每个指令分析副作用
for (auto& BB : func->getBasicBlocks()) {
for (auto& I : BB->getInstructions_Range()) {
Instruction* inst = I.get();
SideEffectInfo instEffect = analyzeInstruction(inst, func, AM);
// 记录指令的副作用信息
result->setInstructionSideEffect(inst, instEffect);
// 合并到函数级别的副作用信息中
functionSideEffect = functionSideEffect.merge(instEffect);
}
}
return functionSideEffect;
}
void SysYSideEffectAnalysisPass::analyzeStronglyConnectedComponent(const std::vector<Function*>& scc, AnalysisManager& AM) {
// 使用不动点算法处理递归函数群
std::unordered_map<Function*, SideEffectInfo> currentEffects;
std::unordered_map<Function*, SideEffectInfo> previousEffects;
// 初始化：所有函数都假设为纯函数
for (Function* func : scc) {
SideEffectInfo initialEffect;
initialEffect.isPure = true;
currentEffects[func] = initialEffect;
result->setFunctionSideEffect(func, initialEffect);
}
bool converged = false;
int iterations = 0;
const int maxIterations = 10; // 防止无限循环
while (!converged && iterations < maxIterations) {
previousEffects = currentEffects;
// 重新分析每个函数
for (Function* func : scc) {
SideEffectInfo newEffect = analyzeFunction(func, AM);
currentEffects[func] = newEffect;
result->setFunctionSideEffect(func, newEffect);
}
// 检查是否收敛
converged = hasConverged(previousEffects, currentEffects);
iterations++;
}
if (iterations >= maxIterations) {
std::cerr << "Warning: SideEffect analysis did not converge for SCC after "
<< maxIterations << " iterations" << std::endl;
}
}
bool SysYSideEffectAnalysisPass::hasConverged(const std::unordered_map<Function*, SideEffectInfo>& oldEffects,
const std::unordered_map<Function*, SideEffectInfo>& newEffects) const {
for (const auto& pair : oldEffects) {
Function* func = pair.first;
const SideEffectInfo& oldEffect = pair.second;
auto it = newEffects.find(func);
if (it == newEffects.end()) {
return false; // 函数不存在于新结果中
}
const SideEffectInfo& newEffect = it->second;
// 比较关键属性是否相同
if (oldEffect.type != newEffect.type ||
oldEffect.mayModifyGlobal != newEffect.mayModifyGlobal ||
oldEffect.mayModifyMemory != newEffect.mayModifyMemory ||
oldEffect.mayCallFunction != newEffect.mayCallFunction ||
oldEffect.isPure != newEffect.isPure) {
return false;
}
}
return true;
}
SideEffectInfo SysYSideEffectAnalysisPass::analyzeInstruction(Instruction* inst, Function* currentFunc, AnalysisManager& AM) {
SideEffectInfo info;
// 根据指令类型进行分析
if (inst->isCall()) {
return analyzeCallInstruction(static_cast<CallInst*>(inst), AM);
return analyzeCallInstruction(static_cast<CallInst*>(inst), currentFunc, AM);
} else if (inst->isStore()) {
return analyzeStoreInstruction(static_cast<StoreInst*>(inst), AM);
return analyzeStoreInstruction(static_cast<StoreInst*>(inst), currentFunc, AM);
} else if (inst->isMemset()) {
return analyzeMemsetInstruction(static_cast<MemsetInst*>(inst), AM);
return analyzeMemsetInstruction(static_cast<MemsetInst*>(inst), currentFunc, AM);
} else if (inst->isBranch() || inst->isReturn()) {
// 控制流指令无副作用，但必须保留
info.type = SideEffectType::NO_SIDE_EFFECT;
@@ -214,7 +292,7 @@ SideEffectInfo SysYSideEffectAnalysisPass::analyzeInstruction(Instruction* inst,
return info;
}
SideEffectInfo SysYSideEffectAnalysisPass::analyzeCallInstruction(CallInst* call, AnalysisManager& AM) {
SideEffectInfo SysYSideEffectAnalysisPass::analyzeCallInstruction(CallInst* call, Function* currentFunc, AnalysisManager& AM) {
SideEffectInfo info;
// 获取被调用的函数
@@ -237,10 +315,24 @@ SideEffectInfo SysYSideEffectAnalysisPass::analyzeCallInstruction(CallInst* call
return *knownInfo;
}
// 对于用户定义的函数，检查是否已经分析过
const SideEffectInfo& funcEffect = result->getFunctionSideEffect(calledFunc);
if (funcEffect.type != SideEffectType::NO_SIDE_EFFECT || !funcEffect.isPure) {
return funcEffect;
// 利用调用图分析结果进行精确分析
if (callGraphAnalysis) {
// 检查被调用函数是否已分析过
const SideEffectInfo& funcEffect = result->getFunctionSideEffect(calledFunc);
if (funcEffect.type != SideEffectType::NO_SIDE_EFFECT || !funcEffect.isPure) {
return funcEffect;
}
// 检查递归调用
if (callGraphAnalysis->isRecursive(calledFunc)) {
// 递归函数保守处理（在不动点算法中会精确分析）
info.type = SideEffectType::FUNCTION_CALL;
info.mayModifyGlobal = true;
info.mayModifyMemory = true;
info.mayCallFunction = true;
info.isPure = false;
return info;
}
}
// 对于未分析的用户函数，保守处理
@@ -253,13 +345,14 @@ SideEffectInfo SysYSideEffectAnalysisPass::analyzeCallInstruction(CallInst* call
return info;
}
SideEffectInfo SysYSideEffectAnalysisPass::analyzeStoreInstruction(StoreInst* store, AnalysisManager& AM) {
SideEffectInfo SysYSideEffectAnalysisPass::analyzeStoreInstruction(StoreInst* store, Function* currentFunc, AnalysisManager& AM) {
SideEffectInfo info;
info.type = SideEffectType::MEMORY_WRITE;
info.mayModifyMemory = true;
info.isPure = false;
// 使用缓存的别名分析结果
// 获取函数的别名分析结果
AliasAnalysisResult* aliasAnalysis = AM.getAnalysisResult<AliasAnalysisResult, SysYAliasAnalysisPass>(currentFunc);
if (aliasAnalysis) {
Value* storePtr = store->getPointer();
@@ -275,13 +368,14 @@ SideEffectInfo SysYSideEffectAnalysisPass::analyzeStoreInstruction(StoreInst* st
return info;
}
SideEffectInfo SysYSideEffectAnalysisPass::analyzeMemsetInstruction(MemsetInst* memset, AnalysisManager& AM) {
SideEffectInfo SysYSideEffectAnalysisPass::analyzeMemsetInstruction(MemsetInst* memset, Function* currentFunc, AnalysisManager& AM) {
SideEffectInfo info;
info.type = SideEffectType::MEMORY_WRITE;
info.mayModifyMemory = true;
info.isPure = false;
// 使用缓存的别名分析结果
// 获取函数的别名分析结果
AliasAnalysisResult* aliasAnalysis = AM.getAnalysisResult<AliasAnalysisResult, SysYAliasAnalysisPass>(currentFunc);
if (aliasAnalysis) {
Value* memsetPtr = memset->getPointer();

4
src/midend/Pass/Optimize/DCE.cpp
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@@ -20,8 +20,8 @@ void DCEContext::run(Function *func, AnalysisManager *AM, bool &changed) {
// 获取别名分析结果
if (AM) {
aliasAnalysis = AM->getAnalysisResult<AliasAnalysisResult, SysYAliasAnalysisPass>(func);
// 获取副作用分析结果
sideEffectAnalysis = AM->getAnalysisResult<SideEffectAnalysisResult, SysYSideEffectAnalysisPass>(func);
// 获取副作用分析结果（Module级别）
sideEffectAnalysis = AM->getAnalysisResult<SideEffectAnalysisResult, SysYSideEffectAnalysisPass>();
if (DEBUG) {
if (aliasAnalysis) {

4
src/midend/Pass/Optimize/SCCP.cpp
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@@ -1275,8 +1275,8 @@ bool SCCP::runOnFunction(Function *F, AnalysisManager &AM) {
}
}
// 获取副作用分析结果
if (auto *sideEffectResult = AM.getAnalysisResult<SideEffectAnalysisResult, SysYSideEffectAnalysisPass>(F)) {
// 获取副作用分析结果（Module级别）
if (auto *sideEffectResult = AM.getAnalysisResult<SideEffectAnalysisResult, SysYSideEffectAnalysisPass>()) {
context.setSideEffectAnalysis(sideEffectResult);
if (DEBUG) {
std::cout << "SCCP: Using side effect analysis results" << std::endl;

4
src/midend/Pass/Pass.cpp
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@@ -3,6 +3,7 @@
#include "Loop.h"
#include "LoopCharacteristics.h"
#include "AliasAnalysis.h"
#include "CallGraphAnalysis.h"
#include "SideEffectAnalysis.h"
#include "SysYIRCFGOpt.h"
#include "SysYIRPrinter.h"
@@ -42,7 +43,8 @@ void PassManager::runOptimizationPipeline(Module* moduleIR, IRBuilder* builderIR
registerAnalysisPass<sysy::DominatorTreeAnalysisPass>();
registerAnalysisPass<sysy::LivenessAnalysisPass>();
registerAnalysisPass<SysYAliasAnalysisPass>(); // 别名分析 (优先级高)
registerAnalysisPass<SysYSideEffectAnalysisPass>(); // 副作用分析 (依赖别名分析)
registerAnalysisPass<CallGraphAnalysisPass>(); // 调用图分析 (Module级别，独立分析)
registerAnalysisPass<SysYSideEffectAnalysisPass>(); // 副作用分析 (依赖别名分析和调用图)
registerAnalysisPass<LoopAnalysisPass>();
registerAnalysisPass<LoopCharacteristicsPass>(); // 循环特征分析依赖别名分析