forked from NUDT-compiler/nudt-compiler-cpp
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116 lines
4.4 KiB
116 lines
4.4 KiB
// 将语法树翻译为 IR。
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// 实现拆分在 IRGenFunc/IRGenStmt/IRGenExp/IRGenDecl。
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#pragma once
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#include <any>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "SysYBaseVisitor.h"
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#include "SysYParser.h"
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#include "ir/IR.h"
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#include "sem/Sema.h"
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namespace ir {
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class Module;
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class Function;
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class IRBuilder;
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class Value;
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}
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class IRGenImpl final : public SysYBaseVisitor {
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public:
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IRGenImpl(ir::Module& module, const SemanticContext& sema);
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std::any visitCompUnit(SysYParser::CompUnitContext* ctx) override;
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std::any visitFuncDef(SysYParser::FuncDefContext* ctx) override;
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std::any visitBlock(SysYParser::BlockContext* ctx) override;
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std::any visitBlockItem(SysYParser::BlockItemContext* ctx) override;
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std::any visitDecl(SysYParser::DeclContext* ctx) override;
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std::any visitConstDecl(SysYParser::ConstDeclContext* ctx) override;
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std::any visitConstDef(SysYParser::ConstDefContext* ctx) override;
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std::any visitStmt(SysYParser::StmtContext* ctx) override;
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std::any visitVarDef(SysYParser::VarDefContext* ctx) override;
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std::any visitPrimaryExp(SysYParser::PrimaryExpContext* ctx) override;
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std::any visitNumber(SysYParser::NumberContext* ctx) override;
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std::any visitLVal(SysYParser::LValContext* ctx) override;
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std::any visitAddExp(SysYParser::AddExpContext* ctx) override;
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std::any visitMulExp(SysYParser::MulExpContext* ctx) override;
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std::any visitUnaryExp(SysYParser::UnaryExpContext* ctx) override;
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std::any visitRelExp(SysYParser::RelExpContext* ctx) override;
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std::any visitEqExp(SysYParser::EqExpContext* ctx) override;
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std::any visitLAndExp(SysYParser::LAndExpContext* ctx) override;
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std::any visitLOrExp(SysYParser::LOrExpContext* ctx) override;
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std::any visitCondUnaryExp(SysYParser::CondUnaryExpContext* ctx) override;
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std::any visitCond(SysYParser::CondContext* ctx) override;
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std::any visitFuncRParams(SysYParser::FuncRParamsContext* ctx) override;
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private:
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enum class BlockFlow {
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Continue,
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Terminated,
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};
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BlockFlow VisitBlockItemResult(SysYParser::BlockItemContext& item);
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ir::Value* EvalExpr(SysYParser::ExpContext& expr);
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ir::ConstantValue* EvaluateConst(antlr4::tree::ParseTree* tree);
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int EvaluateConstInt(SysYParser::ConstExpContext* ctx);
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int EvaluateConstInt(SysYParser::ExpContext* ctx);
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std::shared_ptr<ir::Type> GetGEPResultType(ir::Value* ptr, const std::vector<ir::Value*>& indices);
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// Flatten array initializers
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void FlattenInitVal(SysYParser::InitValContext* ctx,
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const std::vector<int>& dims,
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const std::vector<int>& sub_sizes,
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int dim_idx,
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size_t& current_pos,
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std::vector<ir::Value*>& results,
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bool is_float);
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void FlattenConstInitVal(SysYParser::ConstInitValContext* ctx,
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const std::vector<int>& dims,
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const std::vector<int>& sub_sizes,
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int dim_idx,
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size_t& current_pos,
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std::vector<ir::ConstantValue*>& results,
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bool is_float);
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ir::Module& module_;
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const SemanticContext& sema_;
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ir::Function* func_;
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ir::IRBuilder builder_;
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// 考虑到嵌套作用域（全局、函数、语句块），使用 vector 模拟栈来管理 storage_map_ 和 const_values_
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std::vector<std::unordered_map<std::string, ir::Value*>> storage_map_stack_;
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std::vector<std::unordered_map<std::string, ir::ConstantValue*>> const_values_stack_;
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// 用于在栈中查找变量
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ir::Value* FindStorage(const std::string& name) const {
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for (auto it = storage_map_stack_.rbegin(); it != storage_map_stack_.rend(); ++it) {
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if (it->count(name)) return it->at(name);
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}
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return nullptr;
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}
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ir::ConstantValue* FindConst(const std::string& name) const {
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for (auto it = const_values_stack_.rbegin(); it != const_values_stack_.rend(); ++it) {
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if (it->count(name)) return it->at(name);
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}
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return nullptr;
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}
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// 用于 break 和 continue 跳转的目标位置
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ir::BasicBlock* current_loop_cond_bb_ = nullptr;
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ir::BasicBlock* current_loop_exit_bb_ = nullptr;
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int bb_cnt_ = 0;
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std::string NextBlockName(const std::string& prefix = "bb") {
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return prefix + "_" + std::to_string(++bb_cnt_);
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}
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};
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std::unique_ptr<ir::Module> GenerateIR(SysYParser::CompUnitContext& tree,
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const SemanticContext& sema);
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