publish lab4

CMakeLists.txt

@@ -63,4 +63,4 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
 include_directories(${PROJECT_SOURCE_DIR})
 include_directories(${PROJECT_BINARY_DIR})
 add_subdirectory(src)
-# add_subdirectory(tests)
+add_subdirectory(tests)

include/cminusfc/cminusf_builder.hpp

@@ -67,15 +67,10 @@ class CminusfBuilder : public ASTVisitor {
         auto *output_float_fun =
             Function::create(output_float_type, "outputFloat", module);
 
-        auto *neg_idx_except_type = FunctionType::get(TyVoid, {});
-        auto *neg_idx_except_fun = Function::create(
-            neg_idx_except_type, "neg_idx_except", module);
-
         scope.enter();
         scope.push("input", input_fun);
         scope.push("output", output_fun);
         scope.push("outputFloat", output_float_fun);
-        scope.push("neg_idx_except", neg_idx_except_fun);
     }
 
     Module* getModule() const { return module; }

include/codegen/CodeGen.hpp

@@ -64,18 +64,6 @@ class CodeGen {
     void gen_fptosi();
     void gen_epilogue();
 
-    static std::string label_name(BasicBlock *bb) {
-        return "." + bb->get_parent()->get_name() + "_" + bb->get_name();
-    }
-
-    static std::string func_exit_label_name(Function *func) {
-        return func->get_name() + "_exit";
-    }
-
-    static std::string fcmp_label_name(BasicBlock *bb, unsigned cnt) {
-        return label_name(bb) + "_fcmp_" + std::to_string(cnt);
-    }
-
     struct {
         /* 随着ir遍历设置 */
         Function *func{nullptr};    // 当前函数
@@ -84,14 +72,12 @@ class CodeGen {
         /* 在allocate()中设置 */
         unsigned frame_size{0}; // 当前函数的栈帧大小
         std::unordered_map<Value *, int> offset_map{}; // 指针相对 fp 的偏移
-        unsigned fcmp_cnt{0}; // fcmp 的计数器, 用于创建 fcmp 需要的 label
 
         void clear() {
             func = nullptr;
             bb = nullptr;
             inst = nullptr;
             frame_size = 0;
-            fcmp_cnt = 0;
             offset_map.clear();
         }
 

include/codegen/Register.hpp

@@ -17,7 +17,7 @@
  * $r23 - $r31  $s0 - $s8   static
  *
  * Floating-point Register Convention
- * Name	        Alias	    Meaning
+ * Name         Alias       Meaning
  * $f0-$f1      $fa0-$fa1   argument/return value
  * $f2-$f7      $fa2-$fa7   argument
  * $f8-$f23     $ft0-$ft15  temporary

include/lightir/BasicBlock.hpp

@@ -20,8 +20,7 @@ class BasicBlock : public Value {
     ~BasicBlock() override;
     static BasicBlock *create(Module *m, const std::string &name,
                               Function *parent) {
-        auto prefix = name.empty() ? "" : "label_";
-        return new BasicBlock(m, prefix + name, parent);
+        return new BasicBlock(m, name, parent);
     }
 
     /****************api about cfg****************/

include/lightir/Instruction.hpp

@@ -214,6 +214,8 @@ public:
 
     Value *get_condition() const { return get_operand(0); }
 
+    void replace_all_bb_match(BasicBlock* need_replace, BasicBlock* replace_to);
+
     std::string print() override;
 };
 
@@ -251,8 +253,8 @@ class StoreInst : public Instruction {
   public:
     static StoreInst *create_store(Value *val, Value *ptr, BasicBlock *bb);
 
-    Value *get_rval() const { return this->get_operand(0); }
-    Value *get_lval() const { return this->get_operand(1); }
+    Value *get_val() const { return this->get_operand(0); }
+    Value *get_ptr() const { return this->get_operand(1); }
 
     std::string print() override;
 };
@@ -264,7 +266,7 @@ class LoadInst : public Instruction {
   public:
     static LoadInst *create_load(Value *ptr, BasicBlock *bb, const std::string& name = "");
 
-    Value *get_lval() const { return this->get_operand(0); }
+    Value *get_ptr() const { return this->get_operand(0); }
     Type *get_load_type() const { return get_type(); }
 
     std::string print() override;

include/passes/DeadCode.hpp

@@ -15,7 +15,7 @@ class FuncInfo;
 class DeadCode : public TransformPass {
   public:
     
-	/**
+    /**
      * 
      * @param m 所属 Module
      * @param remove_unreachable_bb 是否需要删除不可达的 BasicBlocks

include/passes/Dominators.hpp

@@ -20,11 +20,11 @@ class Dominators : public FunctionAnalysisPass {
     void run() override;
 
     // 获取基本块的直接支配节点
-    BasicBlock *get_idom(const BasicBlock *bb) const { return idom_.at(bb); }
-    const std::set<BasicBlock*> &get_dominance_frontier(const BasicBlock *bb) {
+    BasicBlock *get_idom(BasicBlock *bb) const { return idom_.at(bb); }
+    const std::set<BasicBlock*> &get_dominance_frontier(BasicBlock *bb) {
         return dom_frontier_.at(bb);
     }
-    const std::set<BasicBlock*> &get_dom_tree_succ_blocks(const BasicBlock *bb) {
+    const std::set<BasicBlock*> &get_dom_tree_succ_blocks(BasicBlock *bb) {
         return dom_tree_succ_blocks_.at(bb);
     }
 
@@ -33,7 +33,7 @@ class Dominators : public FunctionAnalysisPass {
     void dump_dominator_tree();
 
     // functions for dominance tree
-    bool is_dominate(const BasicBlock *bb1, const BasicBlock *bb2) const {
+    bool is_dominate(BasicBlock *bb1, BasicBlock *bb2) const {
         return dom_tree_L_.at(bb1) <= dom_tree_L_.at(bb2) &&
                dom_tree_R_.at(bb1) >= dom_tree_L_.at(bb2);
     }
@@ -54,33 +54,33 @@ class Dominators : public FunctionAnalysisPass {
     void create_dom_tree_succ();
     void create_dom_dfs_order();
 
-    BasicBlock * intersect(BasicBlock *b1, const BasicBlock *b2) const;
+    BasicBlock * intersect(BasicBlock *b1, BasicBlock *b2) const;
 
     void create_reverse_post_order();
-    void set_idom(const BasicBlock *bb, BasicBlock *idom) { idom_[bb] = idom; }
-    void set_dominance_frontier(const BasicBlock *bb, std::set<BasicBlock*>&df) {
+    void set_idom(BasicBlock *bb, BasicBlock *idom) { idom_[bb] = idom; }
+    void set_dominance_frontier(BasicBlock *bb, std::set<BasicBlock*>&df) {
         dom_frontier_[bb].clear();
         dom_frontier_[bb].insert(df.begin(), df.end());
     }
-    void add_dom_tree_succ_block(const BasicBlock *bb, BasicBlock *dom_tree_succ_bb) {
+    void add_dom_tree_succ_block(BasicBlock *bb, BasicBlock *dom_tree_succ_bb) {
         dom_tree_succ_blocks_[bb].insert(dom_tree_succ_bb);
     }
-    unsigned int get_post_order(const BasicBlock *bb) const {
-        return post_order_.at(bb);
+    unsigned int get_reversed_post_order(BasicBlock *bb) const {
+        return reversed_post_order_.at(bb);
     }
     // for debug
     void print_idom() const;
     void print_dominance_frontier();
 
-    std::vector<BasicBlock *> post_order_vec_{}; // 逆后序
-    std::map<const BasicBlock *, unsigned int> post_order_{}; // 逆后序
-    std::map<const BasicBlock *, BasicBlock *> idom_{};  // 直接支配
-    std::map<const BasicBlock *, std::set<BasicBlock*>> dom_frontier_{}; // 支配边界集合
-    std::map<const BasicBlock *, std::set<BasicBlock*>> dom_tree_succ_blocks_{}; // 支配树中的后继节点
+    std::vector<BasicBlock *> reversed_post_order_vec_{}; // 逆后序
+    std::map<BasicBlock *, unsigned int> reversed_post_order_{}; // 逆后序索引
+    std::map<BasicBlock *, BasicBlock *> idom_{};  // 直接支配
+    std::map<BasicBlock *, std::set<BasicBlock*>> dom_frontier_{}; // 支配边界集合
+    std::map<BasicBlock *, std::set<BasicBlock*>> dom_tree_succ_blocks_{}; // 支配树中的后继节点
 
     // 支配树上的dfs序L,R
-    std::map<const BasicBlock *, unsigned int> dom_tree_L_;
-    std::map<const BasicBlock *, unsigned int> dom_tree_R_;
+    std::map<BasicBlock *, unsigned int> dom_tree_L_;
+    std::map<BasicBlock *, unsigned int> dom_tree_R_;
 
     std::vector<BasicBlock *> dom_dfs_order_;
     std::vector<BasicBlock *> dom_post_order_;

include/passes/FuncInfo.hpp

@@ -27,13 +27,17 @@ class FuncInfo : public ModuleAnalysisPass {
     void run() override;
 
     // 函数是否是纯函数
-    bool is_pure(Function *func) { return !func->is_declaration() && !use_libs.count(func) && loads[func].empty() && stores[func].empty(); }
+    bool is_pure(Function *func) { return !func->is_declaration() && !use_libs[func] && loads[func].empty() && stores[func].empty(); }
+    // 函数是否使用了 io
+    bool use_io(Function* func) { return func->is_declaration() || use_libs[func]; }
     // 返回 StoreInst 存入的变量(全局/局部变量或函数参数)
     static Value* store_ptr(const StoreInst* st);
     // 返回 LoadInst 加载的变量(全局/局部变量或函数参数)
     static Value* load_ptr(const LoadInst* ld);
     // 返回 CallInst 代表的函数调用间接存入的变量(全局/局部变量或函数参数)
-	std::unordered_set<Value*> get_stores(const CallInst* call);
+    std::unordered_set<Value*> get_stores(const CallInst* call);
+    // 返回 CallInst 代表的函数调用间接加载的变量(全局/局部变量或函数参数)
+    std::unordered_set<Value*> get_loads(const CallInst* call);
   private:
     // 函数存储的值
     std::unordered_map<Function*, UseMessage> stores;

include/passes/LICM.hpp

@@ -18,8 +18,4 @@ class LoopInvariantCodeMotion : public TransformPass {
     std::vector<Instruction*> collect_insts(Loop* loop);
     void traverse_loop(Loop* loop);
     void run_on_loop(Loop* loop);
-    void collect_loop_info(Loop* loop,
-                          std::set<Value *> &loop_instructions,
-                          std::set<Value *> &updated_global,
-                          bool &contains_impure_call);
 };
\ No newline at end of file

include/passes/LoopDetection.hpp

@@ -40,6 +40,7 @@ class Loop {
     const std::vector<Loop*>& get_sub_loops() { return sub_loops_; }
     const std::unordered_set<BasicBlock *>& get_latches() { return latches_; }
     void add_latch(BasicBlock *bb) { latches_.insert(bb); }
+    std::string safe_print() const;
 };
 
 class LoopDetection : public FunctionAnalysisPass {

lldb_formatters.py

@@ -25,7 +25,8 @@ def __lldb_init_module(debugger: lldb.SBDebugger, internal_dict):
              , "BasicBlock"
              , "GlobalVariable"
              , "Instruction", "IBinaryInst", "FBinaryInst", "ICmpInst", "FCmpInst", "CallInst", "BranchInst", "ReturnInst", "GetElementPtrInst", "StoreInst", "LoadInst", "AllocaInst", "ZextInst", "FpToSiInst", "SiToFpInst", "PhiInst"
-             , "ASMInstruction", "Reg", "FReg", "CFReg" ]
+             , "ASMInstruction", "Reg", "FReg", "CFReg"
+             , "Loop" ]
     for i in types:
         debugger.HandleCommand(
             f"type summary add -F lldb_formatters.SafePrintSummary {i} -w my"

src/cminusfc/cminusf_builder.cpp

@@ -329,27 +329,10 @@ Value* CminusfBuilder::visit(ASTVar &node) {
         }
     } else {
         auto *val = node.expression->accept(*this);
-        auto *exceptBB = BasicBlock::create(module, "", context.func);
-        auto *contBB = BasicBlock::create(module, "", context.func);
         if (val->get_type()->is_float_type()) {
             val = builder->create_fptosi(val, INT32_T);
         }
 
-        Value* is_neg = builder->create_icmp_lt(val, CONST_INT(0));
-
-        builder->create_cond_br(is_neg, exceptBB, contBB);
-        builder->set_insert_point(exceptBB);
-        auto *neg_idx_except_fun = scope.find("neg_idx_except");
-        builder->create_call(dynamic_cast<Function *>(neg_idx_except_fun), {});
-        if (context.func->get_return_type()->is_void_type()) {
-            builder->create_void_ret();
-        } else if (context.func->get_return_type()->is_float_type()) {
-            builder->create_ret(CONST_FP(0.));
-        } else {
-            builder->create_ret(CONST_INT(0));
-        }
-
-        builder->set_insert_point(contBB);
         Value *tmp_ptr;
         if (is_int || is_float) {
             tmp_ptr = builder->create_gep(var, {val});

src/cminusfc/main.cpp

@@ -23,30 +23,30 @@ struct Config {
     std::filesystem::path input_file;
     std::filesystem::path output_file;
 
-    bool emitast{false};
-    bool emitasm{false};
-    bool emitllvm{false};
+    bool emitast{ false };
+    bool emitasm{ false };
+    bool emitllvm{ false };
     // optization conifg
-    bool mem2reg{false};
-    bool licm{false};
+    bool mem2reg{ false };
+    bool licm{ false };
 
-    Config(int argc, char **argv) : argc(argc), argv(argv) {
+    Config(int argc, char** argv) : argc(argc), argv(argv) {
         parse_cmd_line();
         check();
     }
 
-  private:
-    int argc{-1};
-    char **argv{nullptr};
+private:
+    int argc{ -1 };
+    char** argv{ nullptr };
 
     void parse_cmd_line();
     void check();
     // print helper infomation and exit
     void print_help() const;
-    void print_err(const string &msg) const;
+    void print_err(const string& msg) const;
 };
 
-int main(int argc, char **argv) {
+int main(int argc, char** argv) {
     Config config(argc, argv);
 
     auto syntax_tree = parse(config.input_file.c_str());
@@ -55,7 +55,8 @@ int main(int argc, char **argv) {
     if (config.emitast) { // if emit ast (lab1), print ast and return
         ASTPrinter printer;
         ast.run_visitor(printer);
-    } else {
+    }
+    else {
         Module* m;
         CminusfBuilder builder;
         ast.run_visitor(builder);
@@ -63,11 +64,12 @@ int main(int argc, char **argv) {
 
         PassManager PM(m);
         // optimization 
-        if(config.mem2reg) {
+        if (config.mem2reg) {
+            PM.add_pass<DeadCode>(true);
             PM.add_pass<Mem2Reg>();
             PM.add_pass<DeadCode>(false);
         }
-        if(config.licm) {
+        if (config.licm) {
             PM.add_pass<LoopInvariantCodeMotion>();
             PM.add_pass<DeadCode>(false);
         }
@@ -79,13 +81,20 @@ int main(int argc, char **argv) {
             output_stream << "; ModuleID = 'cminus'\n";
             output_stream << "source_filename = " << abs_path << "\n\n";
             output_stream << m->print();
-        } else if (config.emitasm) {
+        }
+        else if (config.emitasm) {
+            auto abs_path = std::filesystem::canonical(config.input_file);
+            config.output_file.replace_extension("ll");
+            std::ofstream output_stream2(config.output_file);
+            output_stream2 << "; ModuleID = 'cminus'\n";
+            output_stream2 << "source_filename = " << abs_path << "\n\n";
+            output_stream2 << m->print();
             CodeGen codegen(m);
             codegen.run();
             output_stream << codegen.print();
         }
 
-		delete m;
+        delete m;
     }
 
     return 0;
@@ -96,27 +105,36 @@ void Config::parse_cmd_line() {
     for (int i = 1; i < argc; ++i) {
         if (argv[i] == "-h"s || argv[i] == "--help"s) {
             print_help();
-        } else if (argv[i] == "-o"s) {
+        }
+        else if (argv[i] == "-o"s) {
             if (output_file.empty() && i + 1 < argc) {
                 output_file = argv[i + 1];
                 i += 1;
-            } else {
+            }
+            else {
                 print_err("bad output file");
             }
-        } else if (argv[i] == "-emit-ast"s) {
+        }
+        else if (argv[i] == "-emit-ast"s) {
             emitast = true;
-        } else if (argv[i] == "-S"s) {
+        }
+        else if (argv[i] == "-S"s) {
             emitasm = true;
-        } else if (argv[i] == "-emit-llvm"s) {
+        }
+        else if (argv[i] == "-emit-llvm"s) {
             emitllvm = true;
-        } else if (argv[i] == "-mem2reg"s) {
+        }
+        else if (argv[i] == "-mem2reg"s) {
             mem2reg = true;
-        } else if (argv[i] == "-licm"s) {
+        }
+        else if (argv[i] == "-licm"s) {
             licm = true;
-        }else {
+        }
+        else {
             if (input_file.empty()) {
                 input_file = argv[i];
-            } else {
+            }
+            else {
                 string err =
                     "unrecognized command-line option \'"s + argv[i] + "\'"s;
                 print_err(err);
@@ -143,24 +161,25 @@ void Config::check() {
     }
     if (output_file.empty()) {
         output_file = input_file.stem();
-        if (emitllvm) {
-            output_file.replace_extension(".ll");
-        } else if (emitasm) {
-            output_file.replace_extension(".s");
-        }
+    }
+    if (emitllvm) {
+        output_file.replace_extension(".ll");
+    }
+    else if (emitasm) {
+        output_file.replace_extension(".s");
     }
 }
 
 void Config::print_help() const {
     std::cout << "Usage: " << exe_name
-              << " [-h|--help] [-o <target-file>] [-emit-llvm] [-S] [-dump-json]"
-                 "[-mem2reg] [-licm]"
-                 "<input-file>"
-              << std::endl;
+        << " [-h|--help] [-o <target-file>] [-emit-llvm] [-S] [-dump-json]"
+        "[-mem2reg] [-licm]"
+        "<input-file>"
+        << std::endl;
     exit(0);
 }
 
-void Config::print_err(const string &msg) const {
+void Config::print_err(const string& msg) const {
     std::cout << exe_name << ": " << msg << std::endl;
     exit(-1);
 }

src/io/io.c

 #include <stdio.h>
 #include <stdlib.h>
-int input() {
+#include <sys/time.h>
+
+struct timeval time_start, time_end;
+int end_set;
+int flags[2];
+
+int input(void)
+{
     int a;
     scanf("%d", &a);
+    gettimeofday(&time_start, NULL);
+    end_set = 0;
     return a;
 }
 
-void output(int a) { printf("%d\n", a); }
+void output(int a)
+{
+    if (end_set == 0)
+    {
+        gettimeofday(&time_end, NULL);
+        end_set = 1;
+    }
+    printf("%d\n", a);
+}
+
+void outputFloat(float a)
+{
+    if (end_set == 0)
+    {
+        gettimeofday(&time_end, NULL);
+        end_set = 1;
+    }
+    printf("%f\n", a);
+}
+
+void add_lab4_flag(int idx, int val)
+{
+    flags[idx] += val;
+}
 
-void outputFloat(float a) { printf("%f\n", a); }
+__attribute((constructor)) void before_main(void)
+{
+    flags[0] = 0;
+    flags[1] = 0;
+    end_set = 0;
+    gettimeofday(&time_start, NULL);
+}
 
-void neg_idx_except() {
-    printf("negative index exception\n");
-    exit(0);
+__attribute((destructor)) void after_main(void)
+{
+    long time_us = 0;
+    fprintf(stderr, "Allocate Size (bytes):\n%d\n", flags[0]);
+    fprintf(stderr, "Execute Cost:\n%d\n", flags[1]);
+    if (end_set == 0)
+    {
+        gettimeofday(&time_end, NULL);
+    }
+    time_us += 1000000L * (time_end.tv_sec - time_start.tv_sec) +
+        time_end.tv_usec - time_start.tv_usec;
+    fprintf(stderr, "Take Times (us):\n%ld\n", time_us);
 }

src/io/io.h

-int input();
+int input(void);
 
 void output(int a);
 
 void outputFloat(float a);
 
-void neg_idx_except();
+void add_lab4_flag(int idx, int val);
\ No newline at end of file

src/lightir/BasicBlock.cpp

@@ -11,14 +11,14 @@
 
 BasicBlock::BasicBlock(const Module* m, const std::string& name = "",
     Function* parent = nullptr)
-    : Value(m->get_label_type(), 
-parent == nullptr ? GLOBAL_BASICBLOCK_NAMES_.get_name(name) : parent->names4blocks_.get_name(name))
-, parent_(parent) {
+    : Value(m->get_label_type(),
+        parent == nullptr ? GLOBAL_BASICBLOCK_NAMES_.get_name(name) : parent->names4blocks_.get_name(name))
+    , parent_(parent) {
     assert(parent && "currently parent should not be nullptr");
     parent_->add_basic_block(this);
 }
 
-Module *BasicBlock::get_module() const { return get_parent()->get_parent(); }
+Module* BasicBlock::get_module() const { return get_parent()->get_parent(); }
 void BasicBlock::erase_from_parent() { this->get_parent()->remove(this); }
 
 bool BasicBlock::is_terminated() const {
@@ -34,18 +34,18 @@ bool BasicBlock::is_terminated() const {
     }
 }
 
-Instruction *BasicBlock::get_terminator() const
+Instruction* BasicBlock::get_terminator() const
 {
     assert(is_terminated() &&
-           "Trying to get terminator from an bb which is not terminated");
+        "Trying to get terminator from an bb which is not terminated");
     return instr_list_.back();
 }
 
-void BasicBlock::add_instruction(Instruction *instr) {
+void BasicBlock::add_instruction(Instruction* instr) {
     if (instr->is_alloca() || instr->is_phi())
     {
         auto it = instr_list_.begin();
-        for (;  it != instr_list_.end() && ((*it)->is_alloca() || (*it)->is_phi()); ++it){}
+        for (; it != instr_list_.end() && ((*it)->is_alloca() || (*it)->is_phi()); ++it) {}
         instr_list_.emplace(it, instr);
         return;
     }
@@ -146,4 +146,4 @@ BasicBlock* BasicBlock::get_entry_block_of_same_function() const
     return parent_->get_entry_block();
 }
 
-Names GLOBAL_BASICBLOCK_NAMES_{"label", "_"};
\ No newline at end of file
+Names GLOBAL_BASICBLOCK_NAMES_{ "label", "_" };
\ No newline at end of file

src/lightir/Function.cpp

@@ -7,17 +7,8 @@
 #include <unordered_set>
 #include <queue>
 
-namespace
-{
-    std::string chopName(std::string name)
-    {
-        if (name.size() > 3) return { name.begin(), name.begin() + 3 };
-        return name;
-    }
-}
-
 Function::Function(FunctionType* ty, const std::string& name, Module* parent)
-    : Value(ty, name), names4blocks_("label", chopName(name) + "_"), names4insts_("op", ""), parent_(parent), seq_cnt_(0) {
+    : Value(ty, name), names4blocks_("", name + "_"), names4insts_("op", ""), parent_(parent), seq_cnt_(0) {
     // num_args_ = ty->getNumParams();
     parent->add_function(this);
     // build args

src/lightir/IRprinter.cpp

@@ -382,7 +382,7 @@ std::string Instruction::safe_print() const
                 }
                 else
                 {
-                    if (auto fty = dynamic_cast<FunctionType*>(ty))
+                    if (auto fty = dynamic_cast<FunctionType*>(op0->get_type()))
                     {
                         auto ty3 = fty->get_return_type();
                         if (ty3 == nullptr)

src/lightir/Instruction.cpp

@@ -197,6 +197,23 @@ BranchInst *BranchInst::create_br(BasicBlock *if_true, BasicBlock *bb) {
     return new BranchInst(nullptr, if_true, nullptr, bb);
 }
 
+void BranchInst::replace_all_bb_match(BasicBlock* need_replace, BasicBlock* replace_to)
+{
+    if (need_replace == nullptr || replace_to == nullptr || need_replace == replace_to) return;
+    int size = static_cast<int>(get_operands().size());
+    for (int i = 0; i < size; i ++)
+    {
+        auto op = get_operand(i);
+        if (op == need_replace) set_operand(i, replace_to);
+    }
+    auto parent = get_parent();
+    if (parent == nullptr) return;
+    parent->remove_succ_basic_block(need_replace);
+    need_replace->remove_pre_basic_block(parent);
+    parent->add_succ_basic_block(replace_to);
+    replace_to->add_pre_basic_block(parent);
+}
+
 ReturnInst::ReturnInst(Value *val, BasicBlock *bb)
     : Instruction(bb->get_module()->get_void_type(), ret, "", bb) {
     if (val == nullptr) {
@@ -352,14 +369,13 @@ SiToFpInst *SiToFpInst::create_sitofp(Value *val, BasicBlock *bb, const std::str
 
 PhiInst::PhiInst(Type *ty, const std::vector<Value *>& vals,
                  const std::vector<BasicBlock *>& val_bbs, BasicBlock *bb, const std::string& name)
-    : Instruction(ty, phi, name) {
+    : Instruction(ty, phi, name, bb) {
     assert(vals.size() == val_bbs.size() && "Unmatched vals and bbs");
     for (unsigned i = 0; i < vals.size(); i++) {
         assert(ty == vals[i]->get_type() && "Bad type for phi");
         add_operand(vals[i]);
         add_operand(val_bbs[i]);
     }
-    this->set_parent(bb);
 }
 
 PhiInst *PhiInst::create_phi(Type *ty, BasicBlock *bb,

src/lightir/Module.cpp

@@ -27,48 +27,48 @@ Module::~Module()
     for (auto i : global_list_) delete i;
 }
 
-Type *Module::get_void_type() const { return void_ty_; }
-Type *Module::get_label_type() const { return label_ty_; }
-IntegerType *Module::get_int1_type() const { return int1_ty_; }
-IntegerType *Module::get_int32_type() const { return int32_ty_; }
-FloatType *Module::get_float_type() const { return float32_ty_; }
-PointerType *Module::get_int32_ptr_type() {
+Type* Module::get_void_type() const { return void_ty_; }
+Type* Module::get_label_type() const { return label_ty_; }
+IntegerType* Module::get_int1_type() const { return int1_ty_; }
+IntegerType* Module::get_int32_type() const { return int32_ty_; }
+FloatType* Module::get_float_type() const { return float32_ty_; }
+PointerType* Module::get_int32_ptr_type() {
     return get_pointer_type(int32_ty_);
 }
-PointerType *Module::get_float_ptr_type() {
+PointerType* Module::get_float_ptr_type() {
     return get_pointer_type(float32_ty_);
 }
 
-PointerType *Module::get_pointer_type(Type *contained) {
+PointerType* Module::get_pointer_type(Type* contained) {
     if (pointer_map_.find(contained) == pointer_map_.end()) {
         pointer_map_[contained] = new PointerType(contained);
     }
     return pointer_map_[contained];
 }
 
-ArrayType *Module::get_array_type(Type *contained, unsigned num_elements) {
-    if (array_map_.find({contained, num_elements}) == array_map_.end()) {
+ArrayType* Module::get_array_type(Type* contained, unsigned num_elements) {
+    if (array_map_.find({ contained, num_elements }) == array_map_.end()) {
         array_map_[{contained, num_elements}] =
             new ArrayType(contained, num_elements);
     }
     return array_map_[{contained, num_elements}];
 }
 
-FunctionType *Module::get_function_type(Type *retty,
-                                        std::vector<Type *> &args) {
-    if (not function_map_.count({retty, args})) {
+FunctionType* Module::get_function_type(Type* retty,
+    std::vector<Type*>& args) {
+    if (not function_map_.count({ retty, args })) {
         function_map_[{retty, args}] =
             new FunctionType(retty, args);
     }
     return function_map_[{retty, args}];
 }
 
-void Module::add_function(Function *f) { function_list_.push_back(f); }
-std::list<Function*> &Module::get_functions() { return function_list_; }
-void Module::add_global_variable(GlobalVariable *g) {
+void Module::add_function(Function* f) { function_list_.push_back(f); }
+std::list<Function*>& Module::get_functions() { return function_list_; }
+void Module::add_global_variable(GlobalVariable* g) {
     global_list_.push_back(g);
 }
-std::list<GlobalVariable*> &Module::get_global_variable() {
+std::list<GlobalVariable*>& Module::get_global_variable() {
     return global_list_;
 }
 

src/lightir/User.cpp

@@ -42,6 +42,6 @@ void User::remove_operand(unsigned idx) {
     }
     // remove the designated operand
     if (operands_[idx])
-		operands_[idx]->remove_use(this, idx);
+        operands_[idx]->remove_use(this, idx);
     operands_.erase(operands_.begin() + idx);
 }

src/passes/DeadCode.cpp

@@ -10,11 +10,12 @@
 // 处理流程：两趟处理，mark 标记有用变量，sweep 删除无用指令
 void DeadCode::run() {
     bool changed;
-	func_info = new FuncInfo(m_);
+    func_info = new FuncInfo(m_);
     func_info->run();
     do {
         changed = false;
         for (auto func : m_->get_functions()) {
+            if (func->is_declaration()) continue;
             if (remove_bb_) changed |= clear_basic_blocks(func);
             mark(func);
             changed |= sweep(func);
@@ -133,7 +134,7 @@ bool DeadCode::sweep(Function *func) {
     for (auto bb : func->get_basic_blocks()) {
         for (auto inst : bb->get_instructions()) {
             if (marked[inst]) continue; 
-        	wait_del.emplace(inst);
+            wait_del.emplace(inst);
         }
         bb->get_instructions().remove_if([&wait_del](Instruction* i) -> bool {return wait_del.count(i); });
         if (!wait_del.empty()) rm = true;
@@ -172,12 +173,12 @@ void DeadCode::sweep_globally() const {
     // changed |= unused_funcs.size() or unused_globals.size();
     for (auto func : unused_funcs)
     {
-		m_->get_functions().remove(func);
-		delete func;
-	}
+        m_->get_functions().remove(func);
+        delete func;
+    }
     for (auto glob : unused_globals)
     {
-		m_->get_global_variable().remove(glob);
-		delete glob;
-	}
+        m_->get_global_variable().remove(glob);
+        delete glob;
+    }
 }

src/passes/Dominators.cpp

@@ -62,13 +62,13 @@ void Dominators::run() {
  * 该函数使用后序号来查找两个节点的最近公共支配者。
  * 通过在支配树上向上遍历直到找到交点。
  */
-BasicBlock *Dominators::intersect(BasicBlock *b1, const BasicBlock *b2) const
+BasicBlock *Dominators::intersect(BasicBlock *b1, BasicBlock *b2) const
 {
     while (b1 != b2) {
-        while (get_post_order(b1) < get_post_order(b2)) {
+        while (get_reversed_post_order(b1) > get_reversed_post_order(b2)) {
             b1 = get_idom(b1);
         }
-        while (get_post_order(b2) < get_post_order(b1)) {
+        while (get_reversed_post_order(b2) > get_reversed_post_order(b1)) {
             b2 = get_idom(b2);
         }
     }
@@ -84,6 +84,12 @@ BasicBlock *Dominators::intersect(BasicBlock *b1, const BasicBlock *b2) const
 void Dominators::create_reverse_post_order() {
     std::set<BasicBlock*> visited;
     dfs(f_->get_entry_block(), visited);
+    int size = static_cast<int>(reversed_post_order_vec_.size()) - 1;
+    for (auto& it : reversed_post_order_)
+    {
+        it.second = size - it.second;
+        reversed_post_order_vec_[it.second] = it.first;
+    }
 }
 
 /**
@@ -100,8 +106,8 @@ void Dominators::dfs(BasicBlock *bb, std::set<BasicBlock *> &visited) {
             dfs(succ, visited);
         }
     }
-    post_order_vec_.push_back(bb);
-    post_order_.insert({bb, post_order_.size()});
+    reversed_post_order_vec_.push_back(bb);
+    reversed_post_order_.insert({bb, reversed_post_order_.size()});
 }
 
 /**
@@ -111,38 +117,28 @@ void Dominators::dfs(BasicBlock *bb, std::set<BasicBlock *> &visited) {
  */
 void Dominators::create_idom() {
     // 可能有用的数据结构
-    // post_order_vec_ vector<BasicBlock*>, 其中基本块按照逆后续排列
-    // post_order_ map<BasicBlock*, unsigned int>, 每个基本块在 post_order_vec_ 中的索引
-	// 可能有用的函数
+    // reversed_post_order_vec_ vector<BasicBlock*>, 其中基本块按照逆后续排列
+    // reversed_post_order_ map<BasicBlock*, unsigned int>, 每个基本块在 reversed_post_order_vec_ 中的索引
+    // 可能有用的函数
     // intersect(BasicBlock *, BasicBlock *) 寻找两个基本块在支配树上的最近祖先
-	// 需要填写
+    // 需要填写
     // idom_ map<BasicBlock *, BasicBlock *> 直接支配者, idom_[a] = b 代表 b 直接支配 a (或者 idom_[a] = a 代表 a 没有直接支配者)
 
-    // 代表基本块的直接支配者是否已经确定, 不会在迭代中改变 (默认初始化为 false)
-    bool* already_determined = new bool[post_order_vec_.size()]{};
+    int bb_count = static_cast<int>(reversed_post_order_vec_.size());
 
-    int bb_count = static_cast<int>(post_order_vec_.size());
-    for (int i = 0; i < bb_count; i++)
-    {
-        auto bb = post_order_vec_[i];
-        // TODO 填写可以直接确定直接支配者, 无需参与迭代的基本块的 idom_ 和 already_determined
-        throw "Unimplemented create_idom";
-    }
+    idom_[reversed_post_order_vec_[0]] = reversed_post_order_vec_[0];
 
     bool changed;
     do
     {
         changed = false;
-        for (int i = 0; i < bb_count; i++)
+        for (int i = 1; i < bb_count; i++)
         {
-            if (already_determined[i]) continue;
-            auto bb = post_order_vec_[i];
+            auto bb = reversed_post_order_vec_[i];
             // TODO 更新基本块 bb 的 idom_, 设置 changed(如果 idom_ 有变化)
-            throw "Unimplemented create_idom";
+            throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
         }
     } while (changed);
-
-    delete[] already_determined;
 }
 
 /**
@@ -154,19 +150,19 @@ void Dominators::create_idom() {
  */
 void Dominators::create_dominance_frontier() {
     // 可能有用的数据结构
-    // post_order_vec_ vector<BasicBlock*>, 其中基本块按照逆后续排列
-    // post_order_ map<BasicBlock*, unsigned int>, 每个基本块在 post_order_vec_ 中的索引
-	// idom_ map<BasicBlock *, BasicBlock *> 直接支配者, idom_[a] = b 代表 b 直接支配 a, 支配树中 b 是 a 的 parent
-	// (或者 idom_[a] = a 代表 a 没有直接支配者)
+    // reversed_post_order_vec_ vector<BasicBlock*>, 其中基本块按照逆后续排列
+    // reversed_post_order_ map<BasicBlock*, unsigned int>, 每个基本块在 reversed_post_order_vec_ 中的索引
+    // idom_ map<BasicBlock *, BasicBlock *> 直接支配者, idom_[a] = b 代表 b 直接支配 a, 支配树中 b 是 a 的 parent
+    // (或者 idom_[a] = a 代表 a 没有直接支配者)
     // 需要填写
     // dom_frontier_ map<BasicBlock*, set<BasicBlock*>> 支配边界
 
-    int bb_count = static_cast<int>(post_order_vec_.size());
+    int bb_count = static_cast<int>(reversed_post_order_vec_.size());
     for (int i = 0; i < bb_count; i++)
     {
-        auto bb = post_order_vec_[i];
+        auto bb = reversed_post_order_vec_[i];
         // TODO 计算 bb 的支配边界集合, 填入 dom_frontier_
-        throw "Unimplemented create_dominance_frontier";
+        throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
     }
 }
 
@@ -178,12 +174,13 @@ void Dominators::create_dominance_frontier() {
  */
 void Dominators::create_dom_tree_succ() {
     // 可能有用的数据结构
-	// idom_ map<BasicBlock *, BasicBlock *> 直接支配者, idom_[a] = b 代表 b 直接支配 a, 支配树中 b 是 a 的 parent
+    // idom_ map<BasicBlock *, BasicBlock *> 直接支配者, idom_[a] = b 代表 b 直接支配 a, 支配树中 b 是 a 的 parent
     // 需要填写
     // dom_tree_succ_blocks_ map<BasicBlock*, set<BasicBlock*>> 支配树中后继(孩子)节点
 
     // TODO 分析得到 f_ 中各个基本块的支配树后继
-    throw "Unimplemented create_dom_tree_succ";
+    // 注意如果 idom_[n] = n, 这意味着 n 没有直接支配者，因此 n 的后继中没有 n
+    throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
 }
 
 /**

src/passes/LICM.cpp

@@ -14,23 +14,23 @@
  */
 void LoopInvariantCodeMotion::run()
 {
-	func_info_ = new FuncInfo(m_);
-	func_info_->run();
-	for (auto func : m_->get_functions())
-	{
-		if (func->is_declaration()) continue;
-		loop_detection_ = new LoopDetection(func);
-		loop_detection_->run();
-		for (auto loop : loop_detection_->get_loops())
-		{
-			// 遍历处理顶层循环
-			if (loop->get_parent() == nullptr) traverse_loop(loop);
-		}
-		delete loop_detection_;
-		loop_detection_ = nullptr;
-	}
-	delete func_info_;
-	func_info_ = nullptr;
+    func_info_ = new FuncInfo(m_);
+    func_info_->run();
+    for (auto func : m_->get_functions())
+    {
+        if (func->is_declaration()) continue;
+        loop_detection_ = new LoopDetection(func);
+        loop_detection_->run();
+        for (auto loop : loop_detection_->get_loops())
+        {
+            // 遍历处理顶层循环
+            if (loop->get_parent() == nullptr) traverse_loop(loop);
+        }
+        delete loop_detection_;
+        loop_detection_ = nullptr;
+    }
+    delete func_info_;
+    func_info_ = nullptr;
 }
 
 /**
@@ -40,12 +40,12 @@ void LoopInvariantCodeMotion::run()
  */
 void LoopInvariantCodeMotion::traverse_loop(Loop* loop)
 {
-	// 先外层再内层，这样不用在插入 preheader 后更改循环
-	run_on_loop(loop);
-	for (auto sub_loop : loop->get_sub_loops())
-	{
-		traverse_loop(sub_loop);
-	}
+    // 先外层再内层，这样不用在插入 preheader 后更改循环
+    run_on_loop(loop);
+    for (auto sub_loop : loop->get_sub_loops())
+    {
+        traverse_loop(sub_loop);
+    }
 }
 
 // TODO: 收集并返回循环 store 过的变量
@@ -56,35 +56,20 @@ void LoopInvariantCodeMotion::traverse_loop(Loop* loop)
 // 则你应该返回 %a 而非 %b
 std::unordered_set<Value*> LoopInvariantCodeMotion::collect_loop_store_vars(Loop* loop)
 {
-	// 可能用到
-	// FuncInfo::store_ptr, FuncInfo::get_stores
-	throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+    // 可能用到
+    // FuncInfo::store_ptr, FuncInfo::get_stores
+    throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
 }
 
 // TODO: 收集并返回循环中的所有指令
 std::vector<Instruction*> LoopInvariantCodeMotion::collect_insts(Loop* loop)
 {
-	throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
-}
-
-
-// TODO: 实现collect_loop_info函数
-// 1. 遍历当前循环及其子循环的所有指令
-// 2. 收集所有指令到loop_instructions中
-// 3. 检查store指令是否修改了全局变量，如果是则添加到updated_global中
-// 4. 检查是否包含非纯函数调用，如果有则设置contains_impure_call为true
-void LoopInvariantCodeMotion::collect_loop_info(
-	Loop* loop,
-	std::set<Value*>& loop_instructions,
-	std::set<Value*>& updated_global,
-	bool& contains_impure_call)
-{
-	throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+    throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
 }
 
 enum InstructionType: std::uint8_t
 {
-	UNKNOWN, VARIANT, INVARIANT
+    UNKNOWN, VARIANT, INVARIANT
 };
 
 /**
@@ -94,91 +79,95 @@ enum InstructionType: std::uint8_t
  */
 void LoopInvariantCodeMotion::run_on_loop(Loop* loop)
 {
-	// 循环 store 过的变量
-	std::unordered_set<Value*> loop_stores_var = collect_loop_store_vars(loop);
-	// 循环中的所有指令
-	std::vector<Instruction*> instructions = collect_insts(loop);
-	int insts_count = static_cast<int>(instructions.size());
-	// 循环的所有基本块
-	std::unordered_set<BasicBlock*> bbs;
-	for (auto i : loop->get_blocks()) bbs.emplace(i);
-	// val 是否在循环内定义，可以当成函数进行调用
-	auto is_val_in_loop = [&bbs](Value* val)->bool
-	{
-		auto inst = dynamic_cast<Instruction*>(val);
-		if (inst == nullptr) return true;
-		return bbs.count(inst->get_parent());
-	};
-	// inst_type[i] 代表 instructions[i] 是循环变量（每次循环都会变）/ 循环不变量 还是 不知道
-	std::vector<InstructionType> inst_type;
-	inst_type.resize(insts_count);
-
-	// 遍历后是不是还有指令不知道 InstructionType
-	bool have_inst_can_not_decide;
-	// 是否存在 invariant
-	bool have_invariant = false;
-	do
-	{
-		have_inst_can_not_decide = false;
-		for (int i = 0; i < insts_count; i++)
-		{
-			Instruction* inst = instructions[i];
-			InstructionType type = inst_type[i];
-			if (type != UNKNOWN) continue;
-			// 可能有用的函数
-			// FuncInfo::load_ptr
-
-			// TODO: 识别循环不变式指令
-			// - 将 store、ret、br、phi 等指令与非纯函数调用标记为 VARIANT
-			// - 如果 load 指令加载的变量是循环 store 过的变量，标记为 VARIANT
-			// - 如果指令有 VARIANT 操作数，标记为 VARIANT
-			// - 如果指令所有操作数都是 INVARIANT (或者不在循环内)，标记为 INVARIANT, 设置 have_invariant
-			// - 否则设置 have_inst_can_not_decide
-			throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
-		}
-	}
-	while (have_inst_can_not_decide);
-
-	if (!have_invariant) return;
-
-	auto header = loop->get_header();
-
-	if (header->get_pre_basic_blocks().size() > 1 || header->get_pre_basic_blocks().front()->get_succ_basic_blocks().size() > 1)
-	{
-		// 插入 preheader
-		auto bb = BasicBlock::create(m_, "", loop->get_header()->get_parent());
-		loop->set_preheader(bb);
-
-		for (auto phi : loop->get_header()->get_instructions())
-		{
-			if (phi->get_instr_type() != Instruction::phi) break;
-			// TODO: 分裂 phi 指令
-			throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
-		}
-
-		// TODO: 维护 bb, header, 与 header 前驱块的基本块关系
-		throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
-
-		bb->add_instruction(BranchInst::create_br(header, bb));
-
-		// 若你想维护 LoopDetection 在 LICM 后保持正确
-		// auto loop2 = loop->get_parent();
-		// while (loop2 != nullptr)
-		// {
-		// 	 loop2->get_parent()->add_block(bb);
-		//	 loop2 = loop2->get_parent();
-		// }
-	}
-	else loop->set_preheader(header->get_pre_basic_blocks().front());
-
-	// insert preheader
-	auto preheader = loop->get_preheader();
-
-	auto terminator = preheader->get_instructions().back();
-	preheader->get_instructions().pop_back();
-
-	// TODO: 外提循环不变指令
-	throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
-
-	preheader->add_instruction(terminator);
+    // 循环 store 过的变量
+    std::unordered_set<Value*> loop_stores_var = collect_loop_store_vars(loop);
+    // 循环中的所有指令
+    std::vector<Instruction*> instructions = collect_insts(loop);
+    int insts_count = static_cast<int>(instructions.size());
+    // Value* 在 map 内说明它是循环内的指令，InstructionType 指示它是循环变量（每次循环都会变）/ 循环不变量 还是 不知道
+    std::unordered_map<Value*, InstructionType> inst_type;
+    for (auto i : instructions) inst_type[i] = UNKNOWN;
+
+    // 遍历后是不是还有指令不知道 InstructionType
+    bool have_inst_can_not_decide;
+    // 是否存在 invariant
+    bool have_invariant = false;
+    do
+    {
+        have_inst_can_not_decide = false;
+        for (int i = 0; i < insts_count; i++)
+        {
+            Instruction* inst = instructions[i];
+            InstructionType type = inst_type[inst];
+            if (type != UNKNOWN) continue;
+            // 可能有用的函数
+            // FuncInfo::load_ptr, FuncInfo::get_stores, FuncInfo::use_io
+
+            // TODO: 识别循环不变式指令
+            // - 将 store、ret、br、phi 等指令与非纯函数调用标记为 VARIANT
+            // - 如果 load 指令加载的变量是循环 store 过的变量，标记为 VARIANT
+            // - 如果指令有 VARIANT 操作数，标记为 VARIANT
+            // - 如果指令所有操作数都是 INVARIANT (或者不在循环内)，标记为 INVARIANT, 设置 have_invariant
+            // - 否则设置 have_inst_can_not_decide
+
+            // TODO: 外提循环不变的非纯函数调用
+            // 注意: 你不应该外提使用了 io 的函数调用
+
+            throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+        }
+    }
+    while (have_inst_can_not_decide);
+
+    if (!have_invariant) return;
+
+    auto header = loop->get_header();
+
+    if (header->get_pre_basic_blocks().size() > 1 || header->get_pre_basic_blocks().front()->get_succ_basic_blocks().size() > 1)
+    {
+        // 插入 preheader
+        auto bb = BasicBlock::create(m_, "", loop->get_header()->get_parent());
+        loop->set_preheader(bb);
+
+        for (auto phi : loop->get_header()->get_instructions())
+        {
+            if (phi->get_instr_type() != Instruction::phi) break;
+            // 可能有用的函数
+            // PhiInst::create_phi
+
+            // TODO: 分裂 phi 指令
+            throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+        }
+
+        // 可能有用的函数
+        // BranchInst::replace_all_bb_match
+
+        // TODO: 维护 bb, header, 与 header 前驱块的基本块关系
+        throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+
+        BranchInst::create_br(header, bb);
+
+        // 若你想维护 LoopDetection 在 LICM 后保持正确
+        // auto loop2 = loop->get_parent();
+        // while (loop2 != nullptr)
+        // {
+        //      loop2->add_block(bb);
+        //     loop2 = loop2->get_parent();
+        // }
+    }
+    else loop->set_preheader(header->get_pre_basic_blocks().front());
+
+    // insert preheader
+    auto preheader = loop->get_preheader();
+
+    auto terminator = preheader->get_instructions().back();
+    preheader->get_instructions().pop_back();
+
+    // 可以使用 Function::check_for_block_relation_error 检查基本块间的关系是否正确维护
+
+    // TODO: 外提循环不变指令
+    throw std::runtime_error("Lab4: 你有一个TODO需要完成！");
+
+    preheader->add_instruction(terminator);
+
+    std::cerr << "licm done\n";
 }

src/passes/LoopDetection.cpp

@@ -54,6 +54,21 @@ void LoopDetection::run() {
     delete dominators_;
 }
 
+std::string Loop::safe_print() const
+{
+    std::string ret;
+    if (header_ == nullptr) ret += "b<null>";
+    else ret += header_->get_name();
+    ret += " ";
+    ret += std::to_string(blocks_.size());
+    ret += "b ";
+    ret += std::to_string(latches_.size());
+    ret += "latch ";
+    ret += std::to_string(sub_loops_.size());
+    ret += "sub";
+    return ret;
+}
+
 /**
  * @brief 发现循环及其子循环
  * @param bb 循环的header块
@@ -69,10 +84,12 @@ void LoopDetection::discover_loop_and_sub_loops(BasicBlock *bb, std::set<BasicBl
     // 5. 建立正确的循环嵌套关系
 
     std::vector<BasicBlock*> work_list = {latches.begin(), latches.end()}; // 初始化工作表
+    std::unordered_set<BasicBlock*> already_in_work_list = { latches.begin(), latches.end() }; // 已经在工作表，防止重复加入
 
     while (!work_list.empty()) { // 当工作表非空时继续处理
         auto bb2 = work_list.back();
         work_list.pop_back();
+        already_in_work_list.erase(bb2);
 
         // TODO-1: 处理未分配给任何循环的节点
         if (bb_to_loop_.find(bb2) == bb_to_loop_.end()) {
@@ -85,7 +102,7 @@ void LoopDetection::discover_loop_and_sub_loops(BasicBlock *bb, std::set<BasicBl
         
         }
         // TODO-2: 处理已属于其他循环的节点
-    	if (bb_to_loop_[bb2] != loop) {
+        if (bb_to_loop_[bb2] != loop) {
             /* 在此添加代码：
              * 1. 获取bb当前所属的循环sub_loop
              * 2. 找到sub_loop的最顶层父循环

src/passes/Mem2Reg.cpp

@@ -4,16 +4,17 @@
 #include "Value.hpp"
 
 
-// l_val 是否是非数组 alloca 变量
-static bool is_not_array_alloca(Value* l_val)
+// ptr 是否是非数组 alloca 变量(是则转换为 AllocaInst)
+static AllocaInst* is_not_array_alloca(Value* ptr)
 {
-    auto alloca = dynamic_cast<AllocaInst*>(l_val);
-    return alloca != nullptr && !alloca->get_alloca_type()->is_array_type();
+    auto alloca = dynamic_cast<AllocaInst*>(ptr);
+    if (alloca != nullptr && !alloca->get_alloca_type()->is_array_type()) return alloca;
+    return nullptr;
 }
 
 /**
  * @brief Mem2Reg Pass的主入口函数
- * 
+ *
  * 该函数执行内存到寄存器的提升过程，将栈上的局部变量提升到SSA格式。
  * 主要步骤：
  * 1. 创建并运行支配树分析
@@ -21,7 +22,7 @@ static bool is_not_array_alloca(Value* l_val)
  *    - 清空相关数据结构
  *    - 插入必要的phi指令
  *    - 执行变量重命名
- * 
+ *
  * 注意：函数执行后，冗余的局部变量分配指令将由后续的死代码删除Pass处理
  */
 void Mem2Reg::run() {
@@ -43,7 +44,7 @@ void Mem2Reg::run() {
             generate_phi();
             // 确保每个局部变量的栈都有初始值
             for (auto var : allocas_)
-                var_val_stack[var].emplace_back(ConstantZero::get(var->get_alloca_type(), m_));
+                var_val_stack[var].emplace_back(var->get_alloca_type()->is_float_type() ? static_cast<Value*>(ConstantFP::get(0, m_)) : static_cast<Value*>(ConstantInt::get(0, m_)));
             // 对应伪代码中重命名阶段
             rename(func_->get_entry_block());
         }
@@ -55,17 +56,17 @@ void Mem2Reg::run() {
 
 /**
  * @brief 在必要的位置插入phi指令
- * 
+ *
  * 该函数实现了经典的phi节点插入算法：
  * 1. 收集全局活跃变量：
  *    - 扫描所有store指令
  *    - 识别在多个基本块中被赋值的变量
- * 
+ *
  * 2. 插入phi指令：
  *    - 对每个全局活跃变量
  *    - 在其定值点的支配边界处插入phi指令
  *    - 使用工作表法处理迭代式的phi插入
- * 
+ *
  * phi指令的插入遵循最小化原则，只在必要的位置插入phi节点
  */
 void Mem2Reg::generate_phi() {
@@ -80,11 +81,13 @@ void Mem2Reg::generate_phi() {
             if (instr->is_store()) {
                 // store i32 a, i32 *b
                 // a is r_val, b is l_val
-                auto l_val = dynamic_cast<StoreInst *>(instr)->get_lval();
-                if (is_not_array_alloca(l_val)) {
-                    auto lalloca = dynamic_cast<AllocaInst*>(instr);
-                    not_array_allocas.insert(lalloca);
-                    allocas_.emplace_back(lalloca);
+                auto l_val = dynamic_cast<StoreInst*>(instr)->get_ptr();
+                if (auto lalloca = is_not_array_alloca(l_val)) {
+                    if (!not_array_allocas.count(lalloca))
+                    {
+                        not_array_allocas.insert(lalloca);
+                        allocas_.emplace_back(lalloca);
+                    }
                     allocas_stored_bbs[lalloca].emplace_back(bb);
                 }
             }
@@ -105,7 +108,7 @@ void Mem2Reg::generate_phi() {
             if (already_handled.count(bb)) continue;
             already_handled.emplace(bb);
             for (auto bb_dominance_frontier_bb :
-                 dominators_->get_dominance_frontier(bb)) {
+                dominators_->get_dominance_frontier(bb)) {
                 if (bb_has_var_phi.find({bb_dominance_frontier_bb, var}) ==
                     bb_has_var_phi.end()) {
                     // generate phi for bb_dominance_frontier_bb & add
@@ -115,7 +118,6 @@ void Mem2Reg::generate_phi() {
                         bb_dominance_frontier_bb);
                     phi_to_alloca_.emplace(phi, var);
                     bb_to_phi_[bb_dominance_frontier_bb].emplace_back(phi);
-                    bb_dominance_frontier_bb->add_instr_begin(phi);
                     work_list.push_back(bb_dominance_frontier_bb);
                     bb_has_var_phi.emplace(bb_dominance_frontier_bb, var);
                 }
@@ -128,20 +130,23 @@ void Mem2Reg::rename(BasicBlock *bb) {
     // 可能用到的数据结构
     // list<AllocaInst*> allocas_ 所有 Mem2Reg 需要消除的局部变量，用于遍历
     // map<AllocaInst*,vector<Value *>> var_val_stack 每个局部变量的存储值栈，还未进行任何操作时已经存进去了 0，不会为空
-	// map<PhiInst *, AllocaInst*>; Phi 对应的局部变量
-	// map<BasicBlock*, list<PhiInst*>>; 在某个基本块的 Phi
+    // map<PhiInst *, AllocaInst*> phi_to_alloca_; Phi 对应的局部变量
+    // map<BasicBlock*, list<PhiInst*>> bb_to_phi_; 在某个基本块的 Phi
     // 可能用到的函数
     // Value::replace_all_use_with(Value* a) 将所有用到 this 的指令对应 this 的操作数都替换为 a
     // BasicBlock::erase_instrs(set<Instruction*>) 移除并 delete 列表中的指令
+    // StoreInst / LoadInst get_ptr 这些 Inst 所操作的变量
+    // is_not_array_alloca(Value* ptr) 一个变量是不是 Mem2Reg 所关心的非数组局部变量
 
     // TODO
     // 步骤一：对每个 alloca 非数组变量(局部变量), 在其存储值栈存入其当前的最新值(也就是目前的栈顶值)
-    // 步骤二：遍历基本块所有指令，执行操作并记录需要删除的 load/store/alloca 指令
-	// - 步骤三: 将 store 指令存储的值，作为其对应局部变量的最新值(更新栈顶)
-	// - 步骤四: 将 load 指令的所有使用替换为其读取的局部变量的最新值
-    // 步骤五：为所有后继块的 phi 添加参数
-    // 步骤六：对 bb 在支配树上的所有后继节点，递归执行 rename 操作
-    // 步骤七：pop 出所有局部变量的最新值
-    // 步骤八：删除需要删除的冗余指令
+    // 步骤二：遍历基本块所有指令，执行操作并记录需要删除的 load/store/alloca 指令(注意: 并非所有 load/store/alloca 都是 Mem2Reg 需要处理的)
+    // - 步骤三: 将 store 指令存储的值，作为其对应局部变量的最新值(更新栈顶)
+    // - 步骤四: 将 phi 指令的所有使用替换为其对应的局部变量的最新值
+    // - 步骤五: 将 load 指令的所有使用替换为其读取的局部变量的最新值
+    // 步骤六：为所有后继块的 phi 添加参数
+    // 步骤七：对 bb 在支配树上的所有后继节点，递归执行 rename 操作
+    // 步骤八：pop 出所有局部变量的最新值
+    // 步骤九：删除需要删除的冗余指令
 }
 

tests/4-opt/CMakeLists.txt

+add_executable(
+    eval_lab4
+    eval_lab4.cpp
+)
+
+
+install(
+    TARGETS eval_lab4
+)
\ No newline at end of file

tests/CMakeLists.txt

-add_subdirectory("2-ir-gen/warmup")
-add_subdirectory("3-codegen/warmup")
\ No newline at end of file
+# add_subdirectory("2-ir-gen/warmup")
+# add_subdirectory("3-codegen/warmup")
+add_subdirectory("4-opt")
\ No newline at end of file