384 lines
18 KiB
C++
384 lines
18 KiB
C++
#pragma once
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <vector>
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#include "IR.h"
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/**
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* @file IRBuilder.h
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*
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* @brief 定义IR构建器的头文件
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*/
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namespace sysy {
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/**
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* @brief 中间IR的构建器
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*
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*/
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class IRBuilder {
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private:
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unsigned labelIndex; ///< 基本块标签编号
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unsigned tmpIndex; ///< 临时变量编号
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BasicBlock *block; ///< 当前基本块
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BasicBlock::iterator position; ///< 当前基本块指令列表位置的迭代器
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std::vector<BasicBlock *> trueBlocks; ///< true分支基本块列表
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std::vector<BasicBlock *> falseBlocks; ///< false分支基本块列表
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std::vector<BasicBlock *> breakBlocks; ///< break目标块列表
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std::vector<BasicBlock *> continueBlocks; ///< continue目标块列表
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public:
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IRBuilder() : labelIndex(0), tmpIndex(0), block(nullptr) {}
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explicit IRBuilder(BasicBlock *block) : labelIndex(0), tmpIndex(0), block(block), position(block->end()) {}
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IRBuilder(BasicBlock *block, BasicBlock::iterator position)
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: labelIndex(0), tmpIndex(0), block(block), position(position) {}
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public:
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unsigned getLabelIndex() {
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labelIndex += 1;
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return labelIndex - 1;
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} ///< 获取基本块标签编号
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unsigned getTmpIndex() {
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tmpIndex += 1;
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return tmpIndex - 1;
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} ///< 获取临时变量编号
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BasicBlock * getBasicBlock() const { return block; } ///< 获取当前基本块
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BasicBlock * getBreakBlock() const { return breakBlocks.back(); } ///< 获取break目标块
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BasicBlock * popBreakBlock() {
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auto result = breakBlocks.back();
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breakBlocks.pop_back();
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return result;
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} ///< 弹出break目标块
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BasicBlock * getContinueBlock() const { return continueBlocks.back(); } ///< 获取continue目标块
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BasicBlock * popContinueBlock() {
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auto result = continueBlocks.back();
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continueBlocks.pop_back();
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return result;
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} ///< 弹出continue目标块
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BasicBlock * getTrueBlock() const { return trueBlocks.back(); } ///< 获取true分支基本块
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BasicBlock * getFalseBlock() const { return falseBlocks.back(); } ///< 获取false分支基本块
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BasicBlock * popTrueBlock() {
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auto result = trueBlocks.back();
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trueBlocks.pop_back();
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return result;
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} ///< 弹出true分支基本块
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BasicBlock * popFalseBlock() {
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auto result = falseBlocks.back();
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falseBlocks.pop_back();
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return result;
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} ///< 弹出false分支基本块
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BasicBlock::iterator getPosition() const { return position; } ///< 获取当前基本块指令列表位置的迭代器
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void setPosition(BasicBlock *block, BasicBlock::iterator position) {
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this->block = block;
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this->position = position;
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} ///< 设置基本块和基本块指令列表位置的迭代器
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void setPosition(BasicBlock::iterator position) {
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this->position = position;
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} ///< 设置当前基本块指令列表位置的迭代器
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void pushBreakBlock(BasicBlock *block) { breakBlocks.push_back(block); } ///< 压入break目标基本块
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void pushContinueBlock(BasicBlock *block) { continueBlocks.push_back(block); } ///< 压入continue目标基本块
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void pushTrueBlock(BasicBlock *block) { trueBlocks.push_back(block); } ///< 压入true分支基本块
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void pushFalseBlock(BasicBlock *block) { falseBlocks.push_back(block); } ///< 压入false分支基本块
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public:
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Instruction * insertInst(Instruction *inst) {
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 插入指令
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UnaryInst * createUnaryInst(Instruction::Kind kind, Type *type, Value *operand, const std::string &name = "") {
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std::string newName;
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if (name.empty()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new UnaryInst(kind, type, operand, block, newName);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建一元指令
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UnaryInst * createNegInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kNeg, Type::getIntType(), operand, name);
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} ///< 创建取反指令
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UnaryInst * createNotInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kNot, Type::getIntType(), operand, name);
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} ///< 创建取非指令
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UnaryInst * createFtoIInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kFtoI, Type::getIntType(), operand, name);
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} ///< 创建浮点转整型指令
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UnaryInst * createBitFtoIInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kBitFtoI, Type::getIntType(), operand, name);
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} ///< 创建按位浮点转整型指令
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UnaryInst * createFNegInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kFNeg, Type::getFloatType(), operand, name);
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} ///< 创建浮点取反指令
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UnaryInst * createFNotInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kFNot, Type::getIntType(), operand, name);
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} ///< 创建浮点取非指令
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UnaryInst * createItoFInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kItoF, Type::getFloatType(), operand, name);
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} ///< 创建整型转浮点指令
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UnaryInst * createBitItoFInst(Value *operand, const std::string &name = "") {
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return createUnaryInst(Instruction::kBitItoF, Type::getFloatType(), operand, name);
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} ///< 创建按位整型转浮点指令
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BinaryInst * createBinaryInst(Instruction::Kind kind, Type *type, Value *lhs, Value *rhs, const std::string &name = "") {
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std::string newName;
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if (name.empty()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new BinaryInst(kind, type, lhs, rhs, block, newName);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建二元指令
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BinaryInst * createAddInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kAdd, Type::getIntType(), lhs, rhs, name);
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} ///< 创建加法指令
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BinaryInst * createSubInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kSub, Type::getIntType(), lhs, rhs, name);
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} ///< 创建减法指令
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BinaryInst * createMulInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kMul, Type::getIntType(), lhs, rhs, name);
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} ///< 创建乘法指令
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BinaryInst * createDivInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kDiv, Type::getIntType(), lhs, rhs, name);
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} ///< 创建除法指令
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BinaryInst * createRemInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kRem, Type::getIntType(), lhs, rhs, name);
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} ///< 创建取余指令
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BinaryInst * createICmpEQInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpEQ, Type::getIntType(), lhs, rhs, name);
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} ///< 创建相等设置指令
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BinaryInst * createICmpNEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpNE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建不相等设置指令
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BinaryInst * createICmpLTInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpLT, Type::getIntType(), lhs, rhs, name);
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} ///< 创建小于设置指令
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BinaryInst * createICmpLEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpLE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建小于等于设置指令
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BinaryInst * createICmpGTInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpGT, Type::getIntType(), lhs, rhs, name);
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} ///< 创建大于设置指令
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BinaryInst * createICmpGEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kICmpGE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建大于等于设置指令
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BinaryInst * createFAddInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFAdd, Type::getFloatType(), lhs, rhs, name);
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} ///< 创建浮点加法指令
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BinaryInst * createFSubInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFSub, Type::getFloatType(), lhs, rhs, name);
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} ///< 创建浮点减法指令
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BinaryInst * createFMulInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFMul, Type::getFloatType(), lhs, rhs, name);
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} ///< 创建浮点乘法指令
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BinaryInst * createFDivInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFDiv, Type::getFloatType(), lhs, rhs, name);
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} ///< 创建浮点除法指令
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BinaryInst * createFCmpEQInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpEQ, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点相等设置指令
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BinaryInst * createFCmpNEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpNE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点不相等设置指令
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BinaryInst * createFCmpLTInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpLT, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点小于设置指令
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BinaryInst * createFCmpLEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpLE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点小于等于设置指令
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BinaryInst * createFCmpGTInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpGT, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点大于设置指令
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BinaryInst * createFCmpGEInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kFCmpGE, Type::getIntType(), lhs, rhs, name);
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} ///< 创建浮点相大于等于设置指令
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BinaryInst * createAndInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kAnd, Type::getIntType(), lhs, rhs, name);
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} ///< 创建按位且指令
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BinaryInst * createOrInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kOr, Type::getIntType(), lhs, rhs, name);
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} ///< 创建按位或指令
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BinaryInst * createSRAInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kSRA, Type::getIntType(), lhs, rhs, name);
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} ///< 创建算术右移指令
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BinaryInst * createMulhInst(Value *lhs, Value *rhs, const std::string &name = "") {
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return createBinaryInst(Instruction::kMulh, Type::getIntType(), lhs, rhs, name);
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} ///< 创建高位乘法指令
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CallInst * createCallInst(Function *callee, const std::vector<Value *> &args, const std::string &name = "") {
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std::string newName;
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if (name.empty() && callee->getReturnType() != Type::getVoidType()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new CallInst(callee, args, block, newName);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建Call指令
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ReturnInst * createReturnInst(Value *value = nullptr, const std::string &name = "") {
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auto inst = new ReturnInst(value, block, name);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建return指令
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UncondBrInst * createUncondBrInst(BasicBlock *thenBlock) {
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auto inst = new UncondBrInst(thenBlock, block);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建无条件指令
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CondBrInst * createCondBrInst(Value *condition, BasicBlock *thenBlock, BasicBlock *elseBlock) {
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auto inst = new CondBrInst(condition, thenBlock, elseBlock, block);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建条件跳转指令
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UnreachableInst * createUnreachableInst(const std::string &name = "") {
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auto inst = new UnreachableInst(name, block);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建不可达指令
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AllocaInst * createAllocaInst(Type *type, const std::string &name = "") {
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auto inst = new AllocaInst(type, block, name);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建分配指令
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LoadInst * createLoadInst(Value *pointer, const std::vector<Value *> &indices = {}, const std::string &name = "") {
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std::string newName;
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if (name.empty()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new LoadInst(pointer, block, newName);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建load指令
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MemsetInst * createMemsetInst(Value *pointer, Value *begin, Value *size, Value *value, const std::string &name = "") {
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auto inst = new MemsetInst(pointer, begin, size, value, block, name);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建memset指令
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StoreInst * createStoreInst(Value *value, Value *pointer, const std::string &name = "") {
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auto inst = new StoreInst(value, pointer, block, name);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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} ///< 创建store指令
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PhiInst * createPhiInst(Type *type, const std::vector<Value*> &vals = {}, const std::vector<BasicBlock*> &blks = {}, const std::string &name = "") {
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std::string newName;
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if (name.empty()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new PhiInst(type, vals, blks, block, newName);
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assert(inst);
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block->getInstructions().emplace(block->begin(), inst);
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return inst;
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} ///< 创建Phi指令
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/**
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* @brief 根据 LLVM 设计模式创建 GEP 指令。
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* 它会自动推断返回类型，无需手动指定。
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*/
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GetElementPtrInst *createGetElementPtrInst(Value *basePointer, const std::vector<Value *> &indices,
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const std::string &name = "") {
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Type *ResultElementType = getIndexedType(basePointer->getType(), indices);
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if (!ResultElementType) {
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assert(false && "Invalid GEP indexing!");
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return nullptr;
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}
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Type *ResultType = PointerType::get(ResultElementType);
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std::string newName;
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if (name.empty()) {
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std::stringstream ss;
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ss << tmpIndex;
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newName = ss.str();
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tmpIndex++;
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} else {
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newName = name;
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}
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auto inst = new GetElementPtrInst(ResultType, basePointer, indices, block, newName);
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assert(inst);
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block->getInstructions().emplace(position, inst);
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return inst;
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}
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static Type *getIndexedType(Type *pointerType, const std::vector<Value *> &indices) {
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assert(pointerType->isPointer() && "base must be a pointer type!");
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// GEP 的类型推断从基指针所指向的类型开始。
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// 例如：
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// - 如果 pointerType 是 `[20 x [10 x i32]]*`，`currentWalkType` 初始为 `[20 x [10 x i32]]`。
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// - 如果 pointerType 是 `i32*`，`currentWalkType` 初始为 `i32`。
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// - 如果 pointerType 是 `i32**`，`currentWalkType` 初始为 `i32*`。
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Type *currentWalkType = pointerType->as<PointerType>()->getBaseType();
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// 遍历所有索引来深入类型层次结构。
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// 重要：第一个索引总是用于"解引用"指针，后续索引才用于数组/结构体的索引
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for (int i = 0; i < indices.size(); ++i) {
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if (i == 0) {
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// 第一个索引：总是用于"解引用"基指针，不改变currentWalkType
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// 例如：对于 `[4 x i32]* ptr, i32 0`，第一个0只是说"访问ptr指向的对象"
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// currentWalkType 保持为 `[4 x i32]`
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continue;
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} else {
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// 后续索引：用于实际的数组/结构体索引
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if (currentWalkType->isArray()) {
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// 数组索引：选择数组中的元素
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currentWalkType = currentWalkType->as<ArrayType>()->getElementType();
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} else if (currentWalkType->isPointer()) {
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// 指针索引：解引用指针并继续
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currentWalkType = currentWalkType->as<PointerType>()->getBaseType();
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} else {
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// 标量类型：不能进一步索引
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if (i < indices.size() - 1) {
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assert(false && "Invalid GEP indexing: attempting to index into a non-aggregate/non-pointer type with further indices.");
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return nullptr;
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}
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}
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}
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}
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// 所有索引处理完毕后，`currentWalkType` 就是 GEP 指令最终计算出的地址所指向的元素的类型。
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return currentWalkType;
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}
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};
|
||
|
||
} // namespace sysy
|