mips without optimize

Compiler.java

@@ -1,42 +1,48 @@
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import frontend.lexer.Lexer;
-import frontend.lexer.TokenStream;
-import frontend.parser.Parser;
-import midend.Midend;
-import midend.errorhandle.ErrorHandler;
-
-import error.Errors;
-import midend.symbol.SymbolManager;
-
-public class Compiler {
-    public static void main(String[] args) {
-        Errors errors = new Errors();
-        try {
-            String content = new String(Files.readAllBytes(Paths.get("testfile.txt")));
-            String llvmFile = "llvm_ir.txt";
-            String errorFile = "error.txt";
-            Lexer lexer = new Lexer(content);
-            lexer.lex(errors);
-            TokenStream ts = new TokenStream(lexer.getTokens());
-            Parser parser = new Parser(ts);
-            parser.parse(errors);
-            ErrorHandler errorHandler = new ErrorHandler(parser.getCompUnit());
-            errorHandler.visit(errors);
-            // for (int i : SymbolManager.getSequence()) {
-            //     System.out.print(i + " ");
-            // }
-            // System.out.println();  // TODO:debug
-            if (errors.size() > 0) {
-                StringBuilder sb = errors.toStringBuilder();
-                Files.write(Paths.get(errorFile), sb.toString().getBytes());
-            } else {
-                Midend midend = new Midend(parser.getCompUnit());
-                midend.generateLLvmIr();
-                midend.writeToFile(llvmFile);
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-}
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import backend.BackEnd;
+import frontend.lexer.Lexer;
+import frontend.lexer.TokenStream;
+import frontend.parser.Parser;
+import midend.Midend;
+import midend.errorhandle.ErrorHandler;
+
+import error.Errors;
+import midend.symbol.SymbolManager;
+
+public class Compiler {
+    public static void main(String[] args) {
+        Errors errors = new Errors();
+        try {
+            String content = new String(Files.readAllBytes(Paths.get("testfile.txt")));
+            String llvmFile = "llvm_ir.txt";
+            String mipsFile = "mips.txt";
+            String errorFile = "error.txt";
+            Lexer lexer = new Lexer(content);
+            lexer.lex(errors);
+            TokenStream ts = new TokenStream(lexer.getTokens());
+            Parser parser = new Parser(ts);
+            parser.parse(errors);
+            ErrorHandler errorHandler = new ErrorHandler(parser.getCompUnit());
+            errorHandler.visit(errors);
+            // for (int i : SymbolManager.getSequence()) {
+            //     System.out.print(i + " ");
+            // }
+            // System.out.println();  // TODO:debug
+            if (errors.size() > 0) {
+                StringBuilder sb = errors.toStringBuilder();
+                Files.write(Paths.get(errorFile), sb.toString().getBytes());
+            } else {
+                Midend midend = new Midend(parser.getCompUnit());
+                midend.generateLLvmIr();
+                // midend.writeToFile(llvmFile);
+                BackEnd backEnd = new BackEnd(midend.getModule());
+                backEnd.toMips();
+                backEnd.writeToFile(mipsFile);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

backend/BackEnd.java

@@ -0,0 +1,32 @@
+package backend;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import backend.mips.MipsBuilder;
+import backend.mips.MipsModule;
+import midend.llvm.IrModule;
+
+public class BackEnd {
+    private MipsModule mipsModule;
+    private IrModule irModule;
+
+    public BackEnd(IrModule irModule) {
+        this.irModule = irModule;
+        this.mipsModule = new MipsModule();
+    }
+
+    public void toMips() {
+        MipsBuilder.setModule(mipsModule);
+        irModule.toMips();
+    }
+
+    public void writeToFile(String fileName) {
+        try {
+            Files.write(Paths.get(fileName), mipsModule.toString().getBytes());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

backend/mips/MipsBuilder.java

@@ -0,0 +1,93 @@
+package backend.mips;
+
+import java.util.HashMap;
+import java.util.ArrayList;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.data.MipsAsciiz;
+import backend.mips.instr.data.MipsSpace;
+import backend.mips.instr.data.MipsWord;
+import midend.llvm.value.IrFuncValue;
+import midend.llvm.value.IrValue;
+
+public class MipsBuilder {
+    private static MipsModule module = null;
+    private static int offset = 0;
+    private static HashMap<IrValue, Integer> valueOffsetMap = new HashMap<>();
+    private static HashMap<IrValue, Register> valueRegisterMap = new HashMap<>();
+
+    public static void setModule(MipsModule module) {
+        MipsBuilder.module = module;
+    }
+
+    public static int getOffset() {
+        return offset;
+    }
+
+    public static void setOffset(int offset) {
+        MipsBuilder.offset = offset;
+    }
+
+    public static void setValueOffsetMap(HashMap<IrValue, Integer> valueOffsetMap) {
+        MipsBuilder.valueOffsetMap = valueOffsetMap;
+    }
+
+    public static HashMap<IrValue, Integer> getValueOffsetMap() {
+        return valueOffsetMap;
+    }
+
+    public static void setValueRegisterMap(HashMap<IrValue, Register> valueRegisterMap) {
+        MipsBuilder.valueRegisterMap = valueRegisterMap;
+    }
+
+    public static HashMap<IrValue, Register> getValueRegisterMap() {
+        return valueRegisterMap;
+    }
+
+    public static MipsModule getModule() {
+        return module;
+    }
+
+    public static void addMipsInstr(MipsInstr instr) {
+        if (instr instanceof MipsAsciiz || instr instanceof MipsWord || instr instanceof MipsSpace) { //data段
+            module.addData(instr);
+        } else {
+            module.addText(instr);
+        }
+    }
+
+    public static void enterNewFunc(IrFuncValue func) {
+        offset = 0;
+        valueOffsetMap = func.getValueOffsetMap();
+        valueOffsetMap.clear(); //TODO：是否需要清空？
+        valueRegisterMap = func.getValueRegisterMap();
+    }
+
+    public static Register getRegister(IrValue value) {
+        return valueRegisterMap.get(value);
+    }
+
+    public static Integer getOffset(IrValue value) {
+        return valueOffsetMap.get(value);
+    }
+
+    public static void allocaRegister(IrValue value, Register reg) {
+        valueRegisterMap.put(value, reg);
+    }
+
+    public static void allocaOffset(IrValue value) {
+        if (!valueOffsetMap.containsKey(value)) {
+            offset -= 4;
+            int valueOffset = offset;
+            valueOffsetMap.put(value, valueOffset);
+        }
+    }
+
+    public static void allocaOffset(int extra) {
+        offset -= extra;
+    }
+
+    public static ArrayList<Register> getUsedRegisters() {
+        return new ArrayList<>(valueRegisterMap.values());
+    }
+}

backend/mips/MipsModule.java

@@ -0,0 +1,51 @@
+package backend.mips;
+
+import java.util.ArrayList;
+
+import backend.mips.instr.MipsAnnotation;
+import backend.mips.instr.MipsLabel;
+import backend.mips.instr.MipsInstr;
+
+public class MipsModule {
+    private ArrayList<MipsInstr> dataList;
+    private ArrayList<MipsInstr> textList;
+
+    public MipsModule() {
+        this.dataList = new ArrayList<MipsInstr>();
+        this.textList = new ArrayList<MipsInstr>();
+    }
+
+    public ArrayList<MipsInstr> getDataList() {
+        return dataList;
+    }
+
+    public ArrayList<MipsInstr> getTextList() {
+        return textList;
+    }
+
+    public void addData(MipsInstr instr) {
+        dataList.add(instr);
+    }
+
+    public void addText(MipsInstr instr) {
+        textList.add(instr);
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(".data\n");
+        for (MipsInstr instr : dataList) {
+            sb.append("\t" + instr.toString());
+        }
+        sb.append("\n.text\n");
+        for (MipsInstr instr : textList) {
+            if (instr instanceof MipsLabel || instr instanceof MipsAnnotation) {
+                sb.append(instr.toString());
+                continue;
+            }
+            sb.append("\t" + instr.toString());
+        }
+        return sb.toString();
+    }
+    
+}

backend/mips/Register.java

@@ -0,0 +1,58 @@
+package backend.mips;
+
+import java.util.ArrayList;
+
+public enum Register {
+    ZERO("$zero"),
+    AT("$at"),
+    V0("$v0"),
+    V1("$v1"),
+    A0("$a0"),
+    A1("$a1"),
+    A2("$a2"),
+    A3("$a3"),
+    T0("$t0"),
+    T1("$t1"),
+    T2("$t2"),
+    T3("$t3"),
+    T4("$t4"),
+    T5("$t5"),
+    T6("$t6"),
+    T7("$t7"),
+    S0("$s0"),
+    S1("$s1"),
+    S2("$s2"),
+    S3("$s3"),
+    S4("$s4"),
+    S5("$s5"),
+    S6("$s6"),
+    S7("$s7"),
+    T8("$t8"),
+    T9("$t9"),
+    K0("$k0"),
+    K1("$k1"),
+    GP("$gp"),
+    SP("$sp"),
+    FP("$fp"),
+    RA("$ra");
+
+    private String regName;
+
+    Register(String regName) {
+        this.regName = regName;
+    }
+
+    public String toString() {
+        return regName;
+    }
+
+    public static ArrayList<Register> availableRegisters() {
+        ArrayList<Register> regs = new ArrayList<>();
+        for (Register reg : Register.values()) {
+            if (reg.toString().charAt(1) == 't' || reg.toString().charAt(1) == 's') {
+                regs.add(reg);
+            }
+        }
+        return regs;
+    }
+}

backend/mips/instr/MipsAlu.java

@@ -0,0 +1,39 @@
+package backend.mips.instr;
+
+import backend.mips.Register;
+import backend.mips.instr.type.MipsAluType;
+import backend.mips.instr.type.MipsType;
+
+public class MipsAlu extends MipsInstr {
+    private MipsAluType aluType;
+    private Register rd;
+    private Register rs;
+    private Register rt;
+    private int immediate;
+    private boolean isImInstr;
+
+    public MipsAlu(MipsAluType aluType, Register rd, Register rs, Register rt) {
+        super(MipsType.ALU);
+        this.aluType = aluType;
+        this.rd = rd;
+        this.rs = rs;
+        this.rt = rt;
+        this.immediate = 0;
+        this.isImInstr = false;
+    }
+
+    public MipsAlu(MipsAluType aluType, Register rd, Register rs, int immediate) {
+        super(MipsType.ALU);
+        this.aluType = aluType;
+        this.rd = rd;
+        this.rs = rs;
+        this.rt = null;
+        this.immediate = immediate;
+        this.isImInstr = true;
+    }
+
+    public String toString() {
+        return isImInstr ? aluType.toString() + " " + rd + ", " + rs + ", " + immediate + "\n"
+                : aluType.toString() + " " + rd + ", " + rs + ", " + rt + "\n";
+    }
+}

backend/mips/instr/MipsAnnotation.java

@@ -0,0 +1,16 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsType;
+
+public class MipsAnnotation extends MipsInstr {
+    private String annotation;
+
+    public MipsAnnotation(String anno) {
+        super(MipsType.ANNOTATION);
+        this.annotation = anno;
+    }
+
+    public String toString() {
+        return "# " + this.annotation + "\n";
+    }
+}

backend/mips/instr/MipsBranch.java

@@ -0,0 +1,36 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsBranchType;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsBranch extends MipsInstr{
+    private MipsBranchType branchType;
+    private Register rs;
+    private Register rt;
+    private String label;
+
+    public MipsBranch(MipsBranchType branchType, Register rs, Register rt, String label) {
+        super(MipsType.BRANCH);
+        this.branchType = branchType;
+        this.rs = rs;
+        this.rt = rt;
+        this.label = label;
+    }
+
+    public MipsBranch(MipsBranchType branchType, Register rs, String label) {
+        super(MipsType.BRANCH);
+        this.branchType = branchType;
+        this.rs = rs;
+        this.rt = null;
+        this.label = label;
+    }
+
+    public String toString() {
+        if (this.rt == null) {
+            return this.branchType.toString() + " " + this.rs + ", " + this.label + "\n";
+        } else {
+            return this.branchType.toString() + " " + this.rs + ", " + this.rt + ", " + this.label + "\n";
+        }
+    }
+}

backend/mips/instr/MipsComp.java

@@ -0,0 +1,42 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsCompareType;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsComp extends MipsInstr {
+    private MipsCompareType compareType;
+    private Register rd;
+    private Register rs;
+    private Register rt;
+    private int immediate;
+    private boolean isImmediate;
+
+    public MipsComp(MipsCompareType compareType, Register rd, Register rs, Register rt) {
+        super(MipsType.COMPARE);
+        this.compareType = compareType;
+        this.rd = rd;
+        this.rs = rs;
+        this.rt = rt;
+        this.immediate = 0;
+        this.isImmediate = false;
+    }
+
+    public MipsComp(MipsCompareType compareType, Register rd, Register rs, int immediate) {
+        super(MipsType.COMPARE);
+        this.compareType = compareType;
+        this.rd = rd;
+        this.rs = rs;
+        this.rt = null;
+        this.immediate = immediate;
+        this.isImmediate = true;
+    }
+
+    public String toString() {
+        if (this.isImmediate) {
+            return this.compareType.toString() + " " + this.rd + ", " + this.rs + ", " + this.immediate + "\n";
+        } else {
+            return this.compareType.toString() + " " + this.rd + ", " + this.rs + ", " + this.rt + "\n";
+        }
+    }
+}

backend/mips/instr/MipsInstr.java

@@ -0,0 +1,21 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsType;
+import backend.mips.MipsBuilder;
+
+public class MipsInstr {
+    private MipsType mt;
+
+    public MipsInstr(MipsType mt) {
+        this.mt = mt;
+        MipsBuilder.addMipsInstr(this);
+    }
+
+    public String toString() {
+        return "";
+    }
+
+    public MipsType getType() {
+        return mt;
+    }
+}

backend/mips/instr/MipsJump.java

@@ -0,0 +1,33 @@
+package backend.mips.instr;
+
+import backend.mips.Register;
+import backend.mips.instr.type.MipsJumpType;
+import backend.mips.instr.type.MipsType;
+
+public class MipsJump extends MipsInstr {
+    private MipsJumpType jumpType;
+    private String label;
+    private Register rd;
+
+    public MipsJump(MipsJumpType jumpType, String label) {
+        super(MipsType.JUMP);
+        this.jumpType = jumpType;
+        this.label = label;
+        this.rd = null;
+    }
+
+    public MipsJump(MipsJumpType jumpType, Register rd) {
+        super(MipsType.JUMP);
+        this.jumpType = jumpType;
+        this.label = null;
+        this.rd = rd;
+    }
+
+    public String toString() {
+        if (this.rd == null) {
+            return this.jumpType.toString() + " " + this.label + "\n";
+        } else {
+            return this.jumpType.toString() + " " + this.rd + "\n";
+        }
+    }
+}

backend/mips/instr/MipsLabel.java

@@ -0,0 +1,16 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsType;
+
+public class MipsLabel extends MipsInstr {
+    private String label;
+
+    public MipsLabel(String label) {
+        super(MipsType.LABEL);
+        this.label = label;
+    }
+
+    public String toString() {
+        return this.label + ":\n";
+    }
+}

backend/mips/instr/MipsLs.java

@@ -0,0 +1,39 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsLsType;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsLs extends MipsInstr {
+    private MipsLsType lsType;
+    private Register rd;
+    private Register rt;
+    private int offset;
+    private String label;
+
+    public MipsLs(MipsLsType lsType, Register rd, Register rt, int offset) {
+        super(MipsType.LS);
+        this.lsType = lsType;
+        this.rd = rd;
+        this.rt = rt;
+        this.offset = offset;
+        this.label = null;
+    }
+
+    public MipsLs(MipsLsType lsType, Register rd, int offset, String label) {
+        super(MipsType.LS);
+        this.lsType = lsType;
+        this.rd = rd;
+        this.rt = null;
+        this.offset = offset;
+        this.label = label;
+    }
+
+    public String toString() {
+        if (this.label == null) {
+            return this.lsType.toString() + " " + this.rd + ", " + this.offset + "(" + this.rt + ")\n";
+        } else {
+            return this.lsType.toString() + " " + this.rd + ", " + this.label + " + " + this.offset + "\n";
+        }
+    }
+}

backend/mips/instr/MipsMd.java

@@ -0,0 +1,33 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsMdType;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsMd extends MipsInstr {
+    private MipsMdType mdType;
+    private Register rd;
+    private Register rt;
+    
+    public MipsMd(MipsMdType mdType, Register rd, Register rt) {
+        super(MipsType.MD);
+        this.mdType = mdType;
+        this.rd = rd;
+        this.rt = rt;
+    }
+
+    public MipsMd(MipsMdType mdType, Register rd) {
+        super(MipsType.MD);
+        this.mdType = mdType;
+        this.rd = rd;
+        this.rt = null;
+    }
+
+    public String toString() {
+        if (this.rt == null) {
+            return this.mdType.toString() + " " + this.rd + "\n";
+        } else {
+            return this.mdType.toString() + " " + this.rd + ", " + this.rt + "\n";
+        }
+    }
+}

backend/mips/instr/MipsSyscall.java

@@ -0,0 +1,13 @@
+package backend.mips.instr;
+
+import backend.mips.instr.type.MipsType;
+
+public class MipsSyscall extends MipsInstr {
+    public MipsSyscall() {
+        super(MipsType.SYSCALL);
+    }
+
+    public String toString() {
+        return "syscall\n";
+    }
+}

backend/mips/instr/data/MipsAsciiz.java

@@ -0,0 +1,19 @@
+package backend.mips.instr.data;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+
+public class MipsAsciiz extends MipsInstr {
+    private String name;
+    private String str;
+
+    public MipsAsciiz(String name, String str) {
+        super(MipsType.DATA);
+        this.name = name;
+        this.str = str;
+    }
+
+    public String toString() {
+        return name + ": .asciiz \"" + str.replaceAll("\n", "\\n") + "\"\n";
+    }
+}

backend/mips/instr/data/MipsSpace.java

@@ -0,0 +1,19 @@
+package backend.mips.instr.data;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+
+public class MipsSpace extends MipsInstr {
+    private int size;
+    private String name;
+
+    public MipsSpace(int size, String name) {
+        super(MipsType.DATA);
+        this.size = size;
+        this.name = name;
+    }
+
+    public String toString() {
+        return name + ": .space " + size + "\n";
+    }
+}

backend/mips/instr/data/MipsWord.java

@@ -0,0 +1,39 @@
+package backend.mips.instr.data;
+
+import java.util.ArrayList;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+
+public class MipsWord extends MipsInstr {
+    private String name;
+    private ArrayList<Integer> valueList;
+
+    public MipsWord(String name, ArrayList<Integer> valueList) {
+        super(MipsType.DATA);
+        this.name = name;
+        this.valueList = valueList;
+    }
+
+    public MipsWord(String name, int value) {
+        super(MipsType.DATA);
+        this.name = name;
+        this.valueList = new ArrayList<Integer>();
+        this.valueList.add(value);
+    }
+
+    public int getValueNum() {
+        return valueList.size();
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(name).append(": .word ");
+        for (int value : valueList) {
+            sb.append(value).append(", ");
+        }
+        sb.delete(sb.length() - 2, sb.length());
+        sb.append("\n");
+        return sb.toString();
+    }
+}

backend/mips/instr/fake/MipsLa.java

@@ -0,0 +1,28 @@
+package backend.mips.instr.fake;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsLa extends MipsInstr {
+    private Register rd;
+    private String label;
+
+    public MipsLa(Register rd, String label) {
+        super(MipsType.FAKE);
+        this.rd = rd;
+        this.label = label;
+    }
+
+    public Register getRd() {
+        return rd;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public String toString() {
+        return "la " + rd + ", " + label + "\n";
+    }
+}

backend/mips/instr/fake/MipsLi.java

@@ -0,0 +1,29 @@
+package backend.mips.instr.fake;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+
+public class MipsLi extends MipsInstr {
+    private Register rd;
+    private int value;
+
+    public MipsLi(Register rd, int value) {
+        super(MipsType.FAKE);
+        this.rd = rd;
+        this.value = value;
+    }
+
+    public Register getRd() {
+        return rd;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    public String toString() {
+        return "li " + rd + ", " + value + "\n";
+    }
+}

backend/mips/instr/fake/MipsMove.java

@@ -0,0 +1,28 @@
+package backend.mips.instr.fake;
+
+import backend.mips.instr.MipsInstr;
+import backend.mips.instr.type.MipsType;
+import backend.mips.Register;
+
+public class MipsMove extends MipsInstr {
+    private Register rd;
+    private Register rt;
+
+    public MipsMove(Register rd, Register rt) {
+        super(MipsType.FAKE);
+        this.rd = rd;
+        this.rt = rt;
+    }
+
+    public Register getDest() {
+        return rd;
+    }
+
+    public Register getSrc() {
+        return rt;
+    }
+
+    public String toString() {
+        return "move " + rd + ", " + rt + "\n";
+    }
+}

backend/mips/instr/type/MipsAluType.java

@@ -0,0 +1,16 @@
+package backend.mips.instr.type;
+
+public enum MipsAluType {
+    // calc_R
+    ADD, SUB, ADDU, SUBU, AND, OR, NOR, XOR, SLT, SLTU,
+    // shiftv
+    SLLV, SRAV, SRLV,
+    // calc_I
+    ADDI, ADDIU, ANDI, ORI, XORI, SLTI, SLTIU,
+    // shift
+    SLL, SRA, SRL;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsBranchType.java

@@ -0,0 +1,9 @@
+package backend.mips.instr.type;
+
+public enum MipsBranchType {
+    BEQ, BNE, BLEZ, BGTZ, BLTZ, BGEZ;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsCompareType.java

@@ -0,0 +1,9 @@
+package backend.mips.instr.type;
+
+public enum MipsCompareType {
+    SLT, SLE, SGT, SGE, SEQ, SNE, SLTI;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsJumpType.java

@@ -0,0 +1,9 @@
+package backend.mips.instr.type;
+
+public enum MipsJumpType {
+    J, JAL, JR;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsLsType.java

@@ -0,0 +1,9 @@
+package backend.mips.instr.type;
+
+public enum MipsLsType {
+    LW, SW, LH, SH, LHU, LB, SB, LBU;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsMdType.java

@@ -0,0 +1,9 @@
+package backend.mips.instr.type;
+
+public enum MipsMdType {
+    MFHI, MFLO, MULT, DIV, MTHI, MTLO;
+
+    public String toString() {
+        return this.name().toLowerCase();
+    }
+}

backend/mips/instr/type/MipsType.java

@@ -0,0 +1,15 @@
+package backend.mips.instr.type;
+
+public enum MipsType {
+    ALU,
+    COMPARE,
+    BRANCH,
+    JUMP,
+    SYSCALL,
+    DATA,
+    LABEL,
+    ANNOTATION,
+    LS,
+    MD,
+    FAKE
+}

config.json

@@ -0,0 +1,4 @@
+{
+    "programming language": "java",
+    "object code": "mips"
+}

error/Error.java

@@ -1,27 +1,27 @@
-package error;
-
-public class Error {
-    private int line;
-    private ErrorType type;
-
-    public Error(int line, ErrorType type) {
-        this.line = line;
-        this.type = type;
-    }
-
-    public void printError() {
-        System.out.println(this.line + " " + this.type);
-    }
-
-    public int getLine() {
-        return this.line;
-    }
-
-    public ErrorType getType() {
-        return this.type;
-    }
-
-    public String toString() {
-        return this.line + " " + this.type + "\n";
-    }
-}
+package error;
+
+public class Error {
+    private int line;
+    private ErrorType type;
+
+    public Error(int line, ErrorType type) {
+        this.line = line;
+        this.type = type;
+    }
+
+    public void printError() {
+        System.out.println(this.line + " " + this.type);
+    }
+
+    public int getLine() {
+        return this.line;
+    }
+
+    public ErrorType getType() {
+        return this.type;
+    }
+
+    public String toString() {
+        return this.line + " " + this.type + "\n";
+    }
+}

error/ErrorType.java

@@ -1,17 +1,17 @@
-package error;
-
-public enum ErrorType {
-    a,
-    b,
-    c,
-    d,
-    e,
-    f,
-    g,
-    h,
-    i,
-    j,
-    k,
-    l,
-    m
-}
+package error;
+
+public enum ErrorType {
+    a,
+    b,
+    c,
+    d,
+    e,
+    f,
+    g,
+    h,
+    i,
+    j,
+    k,
+    l,
+    m
+}

frontend/ast/NodeStack.java

@@ -1,23 +1,23 @@
-package frontend.ast;
-
-import java.util.ArrayList;
-
-public class NodeStack {
-    private ArrayList<Node> stack;
-
-    public NodeStack() {
-        stack = new ArrayList<Node>();
-    }
-
-    public void push(Node node) {
-        stack.add(node);
-    }
-
-    public Node pop() {
-        return stack.remove(stack.size() - 1);
-    }
-
-    public int size() {
-        return stack.size();
-    }
-}
+package frontend.ast;
+
+import java.util.ArrayList;
+
+public class NodeStack {
+    private ArrayList<Node> stack;
+
+    public NodeStack() {
+        stack = new ArrayList<Node>();
+    }
+
+    public void push(Node node) {
+        stack.add(node);
+    }
+
+    public Node pop() {
+        return stack.remove(stack.size() - 1);
+    }
+
+    public int size() {
+        return stack.size();
+    }
+}

frontend/ast/block/BlockItem.java

@@ -1,28 +1,28 @@
-package frontend.ast.block;
-
-import error.Errors;
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.decl.Decl;
-
-public class BlockItem extends Node {
-    public BlockItem(TokenStream ts) {
-        super(SyntaxType.BLOCK_ITEM, ts);
-    }
-
-    public void parse(Errors errors) {
-        if (getCurrToken().getType() == TokenType.CONSTTK
-                || getCurrToken().getType() == TokenType.STATICTK
-                || getCurrToken().getType() == TokenType.INTTK) {
-            Decl decl = new Decl(this.ts);
-            decl.parse(errors);
-            addChild(decl);
-        } else {
-            Stmt stmt = new Stmt(this.ts);
-            stmt.parse(errors);
-            addChild(stmt);
-        }
-    }
-}
+package frontend.ast.block;
+
+import error.Errors;
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.decl.Decl;
+
+public class BlockItem extends Node {
+    public BlockItem(TokenStream ts) {
+        super(SyntaxType.BLOCK_ITEM, ts);
+    }
+
+    public void parse(Errors errors) {
+        if (getCurrToken().getType() == TokenType.CONSTTK
+                || getCurrToken().getType() == TokenType.STATICTK
+                || getCurrToken().getType() == TokenType.INTTK) {
+            Decl decl = new Decl(this.ts);
+            decl.parse(errors);
+            addChild(decl);
+        } else {
+            Stmt stmt = new Stmt(this.ts);
+            stmt.parse(errors);
+            addChild(stmt);
+        }
+    }
+}

frontend/ast/block/ForStmt.java

@@ -1,57 +1,57 @@
-package frontend.ast.block;
-
-import frontend.ast.SyntaxType;
-import frontend.ast.token.TokenNode;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.Node;
-import frontend.ast.exp.Exp;
-import frontend.ast.exp.LVal;
-
-import java.util.ArrayList;
-
-import error.Errors;
-
-public class ForStmt extends Node {
-    public ForStmt(TokenStream ts) {
-        super(SyntaxType.FOR_STMT, ts);
-    }
-
-    public void parse(Errors errors) {
-        handleAssign(errors);
-        while (getCurrToken().getType() == TokenType.COMMA) {
-            addChild(new TokenNode(ts)); // comma
-            handleAssign(errors);
-        }
-    }
-
-    public void handleAssign(Errors errors) {
-        LVal lval = new LVal(this.ts);
-        lval.parse(errors);
-        addChild(lval);
-        addChild(new TokenNode(ts)); // assign
-        Exp exp = new Exp(this.ts);
-        exp.parse(errors);
-        addChild(exp);
-    }
-
-    public ArrayList<LVal> getLValList() {
-        ArrayList<LVal> lvalList = new ArrayList<>();
-        for (int i = 0; i < getChildren().size(); i++) {
-            if (getChild(i) instanceof LVal) {
-                lvalList.add((LVal) getChild(i));
-            }
-        }
-        return lvalList;
-    }
-
-    public ArrayList<Exp> getExpList() {
-        ArrayList<Exp> expList = new ArrayList<>();
-        for (int i = 0; i < getChildren().size(); i++) {
-            if (getChild(i) instanceof Exp) {
-                expList.add((Exp) getChild(i));
-            }
-        }
-        return expList;
-    }
-}
+package frontend.ast.block;
+
+import frontend.ast.SyntaxType;
+import frontend.ast.token.TokenNode;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.Node;
+import frontend.ast.exp.Exp;
+import frontend.ast.exp.LVal;
+
+import java.util.ArrayList;
+
+import error.Errors;
+
+public class ForStmt extends Node {
+    public ForStmt(TokenStream ts) {
+        super(SyntaxType.FOR_STMT, ts);
+    }
+
+    public void parse(Errors errors) {
+        handleAssign(errors);
+        while (getCurrToken().getType() == TokenType.COMMA) {
+            addChild(new TokenNode(ts)); // comma
+            handleAssign(errors);
+        }
+    }
+
+    public void handleAssign(Errors errors) {
+        LVal lval = new LVal(this.ts);
+        lval.parse(errors);
+        addChild(lval);
+        addChild(new TokenNode(ts)); // assign
+        Exp exp = new Exp(this.ts);
+        exp.parse(errors);
+        addChild(exp);
+    }
+
+    public ArrayList<LVal> getLValList() {
+        ArrayList<LVal> lvalList = new ArrayList<>();
+        for (int i = 0; i < getChildren().size(); i++) {
+            if (getChild(i) instanceof LVal) {
+                lvalList.add((LVal) getChild(i));
+            }
+        }
+        return lvalList;
+    }
+
+    public ArrayList<Exp> getExpList() {
+        ArrayList<Exp> expList = new ArrayList<>();
+        for (int i = 0; i < getChildren().size(); i++) {
+            if (getChild(i) instanceof Exp) {
+                expList.add((Exp) getChild(i));
+            }
+        }
+        return expList;
+    }
+}

frontend/ast/block/Stmt.java

@@ -1,274 +1,274 @@
-package frontend.ast.block;
-
-import error.Errors;
-
-import java.util.ArrayList;
-
-import error.Error;
-import error.ErrorType;
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import frontend.ast.exp.Exp;
-import frontend.ast.exp.Cond;
-import frontend.ast.exp.LVal;
-
-public class Stmt extends Node {
-    private boolean getint;
-
-    public Stmt(TokenStream ts) {
-        super(SyntaxType.STMT, ts);
-        getint = false;
-    }
-
-    public void parse(Errors errors) {
-        if (getCurrToken().getType() == TokenType.LBRACE) {
-            Block block = new Block(this.ts);
-            block.parse(errors);
-            addChild(block);
-        } else if (getCurrToken().getType() == TokenType.IFTK) {
-            handleIf(errors);
-        } else if (getCurrToken().getType() == TokenType.FORTK) {
-            handleFor(errors);
-        } else if (getCurrToken().getType() == TokenType.BREAKTK) {
-            TokenNode breakkk = new TokenNode(this.ts);
-            addChild(breakkk);
-            if (getCurrToken().getType() == TokenType.SEMICN) {
-                TokenNode semicolon = new TokenNode(this.ts);
-                addChild(semicolon);
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-            }
-        } else if (getCurrToken().getType() == TokenType.CONTINUETK) {
-            TokenNode continuekk = new TokenNode(this.ts);
-            addChild(continuekk);
-            if (getCurrToken().getType() == TokenType.SEMICN) {
-                TokenNode semicolon = new TokenNode(this.ts);
-                addChild(semicolon);
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-            }
-        } else if (getCurrToken().getType() == TokenType.RETURNTK) {
-            handleReturn(errors);
-        } else if (getCurrToken().getType() == TokenType.PRINTFTK) {
-            handlePrintf(errors);
-        } else {
-            handleAssign(errors);
-        }
-    }
-
-    public void handleIf(Errors errors) {
-        TokenNode ifkk = new TokenNode(this.ts);
-        addChild(ifkk);
-        TokenNode lparent = new TokenNode(this.ts);
-        addChild(lparent);
-        Cond cond = new Cond(this.ts);
-        cond.parse(errors);
-        addChild(cond);
-        if (getCurrToken().getType() == TokenType.RPARENT) {
-            TokenNode rparent = new TokenNode(this.ts);
-            addChild(rparent);
-        } else {
-            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
-        }
-        Stmt stmt = new Stmt(this.ts);
-        stmt.parse(errors);
-        addChild(stmt);
-        if (getCurrToken().getType() == TokenType.ELSETK) {
-            TokenNode elsekk = new TokenNode(this.ts);
-            addChild(elsekk);
-            Stmt elseStmt = new Stmt(this.ts);
-            elseStmt.parse(errors);
-            addChild(elseStmt);
-        }
-    }
-
-    public void handleFor(Errors errors) {
-        TokenNode forkk = new TokenNode(this.ts);
-        addChild(forkk);
-        TokenNode lparent = new TokenNode(this.ts);
-        addChild(lparent);
-        if (getCurrToken().getType() == TokenType.SEMICN) {
-            TokenNode semicolon = new TokenNode(this.ts);
-            addChild(semicolon);
-        } else {
-            ForStmt fst = new ForStmt(this.ts);
-            fst.parse(errors);
-            addChild(fst);
-            TokenNode semicolon = new TokenNode(this.ts);
-            addChild(semicolon);
-        }
-        if (getCurrToken().getType() == TokenType.SEMICN) {
-            TokenNode semicolon = new TokenNode(this.ts);
-            addChild(semicolon);
-        } else {
-            Cond cond = new Cond(this.ts);
-            cond.parse(errors);
-            addChild(cond);
-            TokenNode semicolon = new TokenNode(this.ts);
-            addChild(semicolon);
-        }
-        if (getCurrToken().getType() == TokenType.RPARENT) {
-            TokenNode rparent = new TokenNode(this.ts);
-            addChild(rparent);
-        } else {
-            ForStmt fst = new ForStmt(this.ts);
-            fst.parse(errors);
-            addChild(fst);
-            TokenNode rparent = new TokenNode(this.ts);
-            addChild(rparent);
-        }
-        Stmt stmt = new Stmt(this.ts);
-        stmt.parse(errors);
-        addChild(stmt);
-    }
-
-    public void handleReturn(Errors errors) {
-        TokenNode returnkk = new TokenNode(this.ts);
-        addChild(returnkk);
-        if (currentIsExp()) {
-            Exp exp = new Exp(this.ts);
-            exp.parse(errors);
-            addChild(exp);
-        }
-        if (getCurrToken().getType() == TokenType.SEMICN) {
-            TokenNode semicolon = new TokenNode(this.ts);
-            addChild(semicolon);
-        } else {
-            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-        }
-    }
-
-    public void handlePrintf(Errors errors) {
-        TokenNode printfkk = new TokenNode(this.ts);
-        addChild(printfkk);
-        addChild(new TokenNode(this.ts)); // lparent
-        addChild(new TokenNode(this.ts)); // strconst
-        while (getCurrToken().getType() == TokenType.COMMA) {
-            addChild(new TokenNode(this.ts)); // comma
-            Exp exp = new Exp(this.ts);
-            exp.parse(errors);
-            addChild(exp);
-        }
-        if (getCurrToken().getType() != TokenType.RPARENT) {
-            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
-        } else {
-            addChild(new TokenNode(this.ts)); // rparent
-        }
-        if (getCurrToken().getType() != TokenType.SEMICN) {
-            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-        } else {
-            addChild(new TokenNode(this.ts)); // semicolon
-        }
-    }
-
-    public void handleAssign(Errors errors) {
-        if (getCurrToken().getType() == TokenType.IDENFR) {
-            if (this.ts.peek(1).getType() == TokenType.ASSIGN) {
-                LVal lval = new LVal(this.ts);
-                lval.parse(errors);
-                addChild(lval);
-                addChild(new TokenNode(this.ts)); // assign
-                if (getCurrToken().getValue().equals("getint")) {
-                    getint = true;
-                }
-                Exp exp = new Exp(this.ts);
-                exp.parse(errors);
-                addChild(exp);
-                if (getCurrToken().getType() == TokenType.SEMICN) {
-                    addChild(new TokenNode(this.ts)); // semicolon
-                } else {
-                    errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-                }
-            } else if (this.ts.peek(1).getType() == TokenType.LBRACK) {
-                int start = this.ts.getCurrentIndex();
-                LVal lval = new LVal(this.ts);
-                lval.parse(errors);
-                if (getCurrToken().getType() == TokenType.ASSIGN) {
-                    addChild(lval);
-                    addChild(new TokenNode(this.ts)); // assign
-                    if (getCurrToken().getValue().equals("getint")) {
-                        getint = true;
-                    }
-                    handleExpInAssign(errors);
-                } else {
-                    this.ts.resetIndex(start);
-                    // parse exp ;
-                    handleExpInAssign(errors);
-                }
-            } else {
-                handleExpInAssign(errors);
-            }
-        } else {
-            if (currentIsExp()) {
-                handleExpInAssign(errors);
-            } else {
-                if (getCurrToken().getType() == TokenType.SEMICN) {
-                    addChild(new TokenNode(this.ts)); // semicolon
-                } else {
-                    errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-                }
-            }
-        }
-    }
-
-    public void handleExpInAssign(Errors errors) {
-        Exp exp = new Exp(this.ts);
-        exp.parse(errors);
-        addChild(exp);
-        if (getCurrToken().getType() == TokenType.SEMICN) {
-            addChild(new TokenNode(this.ts)); // semicolon
-        } else {
-            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
-        }
-    }
-
-    public boolean currentIsExp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.PLUS || t == TokenType.MINU || t == TokenType.NOT
-                || t == TokenType.IDENFR || t == TokenType.LPARENT || t == TokenType.INTCON;
-    }
-
-    public boolean isGetint() {
-        return getint;
-    }
-
-    public ArrayList<Exp> getExpList() {
-        ArrayList<Exp> expList = new ArrayList<>();
-        for (int i = 0; i < getChildren().size(); i++) {
-            if (getChild(i) instanceof Exp) {
-                expList.add((Exp) getChild(i));
-            }
-        }
-        return expList;
-    }
-
-    public Cond getCond() { //just for fortype stmt
-        for (int i = 0; i < getChildren().size(); i++) {
-            if (getChild(i) instanceof Cond) {
-                return (Cond) getChild(i);
-            }
-        }
-        return null;
-    }
-
-    public ForStmt getinitStmt() {
-        if (getChild(2) instanceof ForStmt) {
-            return (ForStmt) getChild(2);
-        }
-        return null;
-    }
-
-    public ForStmt getStepStmt() {
-        if (getChild(getChildren().size() - 3) instanceof ForStmt) {
-            return (ForStmt) getChild(getChildren().size() - 3);
-        }
-        return null;
-    }
-
-    public Stmt getBodyStmt() {
-        return (Stmt) getChild(getChildren().size() - 1);
-    }
-}
+package frontend.ast.block;
+
+import error.Errors;
+
+import java.util.ArrayList;
+
+import error.Error;
+import error.ErrorType;
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import frontend.ast.exp.Exp;
+import frontend.ast.exp.Cond;
+import frontend.ast.exp.LVal;
+
+public class Stmt extends Node {
+    private boolean getint;
+
+    public Stmt(TokenStream ts) {
+        super(SyntaxType.STMT, ts);
+        getint = false;
+    }
+
+    public void parse(Errors errors) {
+        if (getCurrToken().getType() == TokenType.LBRACE) {
+            Block block = new Block(this.ts);
+            block.parse(errors);
+            addChild(block);
+        } else if (getCurrToken().getType() == TokenType.IFTK) {
+            handleIf(errors);
+        } else if (getCurrToken().getType() == TokenType.FORTK) {
+            handleFor(errors);
+        } else if (getCurrToken().getType() == TokenType.BREAKTK) {
+            TokenNode breakkk = new TokenNode(this.ts);
+            addChild(breakkk);
+            if (getCurrToken().getType() == TokenType.SEMICN) {
+                TokenNode semicolon = new TokenNode(this.ts);
+                addChild(semicolon);
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+            }
+        } else if (getCurrToken().getType() == TokenType.CONTINUETK) {
+            TokenNode continuekk = new TokenNode(this.ts);
+            addChild(continuekk);
+            if (getCurrToken().getType() == TokenType.SEMICN) {
+                TokenNode semicolon = new TokenNode(this.ts);
+                addChild(semicolon);
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+            }
+        } else if (getCurrToken().getType() == TokenType.RETURNTK) {
+            handleReturn(errors);
+        } else if (getCurrToken().getType() == TokenType.PRINTFTK) {
+            handlePrintf(errors);
+        } else {
+            handleAssign(errors);
+        }
+    }
+
+    public void handleIf(Errors errors) {
+        TokenNode ifkk = new TokenNode(this.ts);
+        addChild(ifkk);
+        TokenNode lparent = new TokenNode(this.ts);
+        addChild(lparent);
+        Cond cond = new Cond(this.ts);
+        cond.parse(errors);
+        addChild(cond);
+        if (getCurrToken().getType() == TokenType.RPARENT) {
+            TokenNode rparent = new TokenNode(this.ts);
+            addChild(rparent);
+        } else {
+            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
+        }
+        Stmt stmt = new Stmt(this.ts);
+        stmt.parse(errors);
+        addChild(stmt);
+        if (getCurrToken().getType() == TokenType.ELSETK) {
+            TokenNode elsekk = new TokenNode(this.ts);
+            addChild(elsekk);
+            Stmt elseStmt = new Stmt(this.ts);
+            elseStmt.parse(errors);
+            addChild(elseStmt);
+        }
+    }
+
+    public void handleFor(Errors errors) {
+        TokenNode forkk = new TokenNode(this.ts);
+        addChild(forkk);
+        TokenNode lparent = new TokenNode(this.ts);
+        addChild(lparent);
+        if (getCurrToken().getType() == TokenType.SEMICN) {
+            TokenNode semicolon = new TokenNode(this.ts);
+            addChild(semicolon);
+        } else {
+            ForStmt fst = new ForStmt(this.ts);
+            fst.parse(errors);
+            addChild(fst);
+            TokenNode semicolon = new TokenNode(this.ts);
+            addChild(semicolon);
+        }
+        if (getCurrToken().getType() == TokenType.SEMICN) {
+            TokenNode semicolon = new TokenNode(this.ts);
+            addChild(semicolon);
+        } else {
+            Cond cond = new Cond(this.ts);
+            cond.parse(errors);
+            addChild(cond);
+            TokenNode semicolon = new TokenNode(this.ts);
+            addChild(semicolon);
+        }
+        if (getCurrToken().getType() == TokenType.RPARENT) {
+            TokenNode rparent = new TokenNode(this.ts);
+            addChild(rparent);
+        } else {
+            ForStmt fst = new ForStmt(this.ts);
+            fst.parse(errors);
+            addChild(fst);
+            TokenNode rparent = new TokenNode(this.ts);
+            addChild(rparent);
+        }
+        Stmt stmt = new Stmt(this.ts);
+        stmt.parse(errors);
+        addChild(stmt);
+    }
+
+    public void handleReturn(Errors errors) {
+        TokenNode returnkk = new TokenNode(this.ts);
+        addChild(returnkk);
+        if (currentIsExp()) {
+            Exp exp = new Exp(this.ts);
+            exp.parse(errors);
+            addChild(exp);
+        }
+        if (getCurrToken().getType() == TokenType.SEMICN) {
+            TokenNode semicolon = new TokenNode(this.ts);
+            addChild(semicolon);
+        } else {
+            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+        }
+    }
+
+    public void handlePrintf(Errors errors) {
+        TokenNode printfkk = new TokenNode(this.ts);
+        addChild(printfkk);
+        addChild(new TokenNode(this.ts)); // lparent
+        addChild(new TokenNode(this.ts)); // strconst
+        while (getCurrToken().getType() == TokenType.COMMA) {
+            addChild(new TokenNode(this.ts)); // comma
+            Exp exp = new Exp(this.ts);
+            exp.parse(errors);
+            addChild(exp);
+        }
+        if (getCurrToken().getType() != TokenType.RPARENT) {
+            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
+        } else {
+            addChild(new TokenNode(this.ts)); // rparent
+        }
+        if (getCurrToken().getType() != TokenType.SEMICN) {
+            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+        } else {
+            addChild(new TokenNode(this.ts)); // semicolon
+        }
+    }
+
+    public void handleAssign(Errors errors) {
+        if (getCurrToken().getType() == TokenType.IDENFR) {
+            if (this.ts.peek(1).getType() == TokenType.ASSIGN) {
+                LVal lval = new LVal(this.ts);
+                lval.parse(errors);
+                addChild(lval);
+                addChild(new TokenNode(this.ts)); // assign
+                if (getCurrToken().getValue().equals("getint")) {
+                    getint = true;
+                }
+                Exp exp = new Exp(this.ts);
+                exp.parse(errors);
+                addChild(exp);
+                if (getCurrToken().getType() == TokenType.SEMICN) {
+                    addChild(new TokenNode(this.ts)); // semicolon
+                } else {
+                    errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+                }
+            } else if (this.ts.peek(1).getType() == TokenType.LBRACK) {
+                int start = this.ts.getCurrentIndex();
+                LVal lval = new LVal(this.ts);
+                lval.parse(errors);
+                if (getCurrToken().getType() == TokenType.ASSIGN) {
+                    addChild(lval);
+                    addChild(new TokenNode(this.ts)); // assign
+                    if (getCurrToken().getValue().equals("getint")) {
+                        getint = true;
+                    }
+                    handleExpInAssign(errors);
+                } else {
+                    this.ts.resetIndex(start);
+                    // parse exp ;
+                    handleExpInAssign(errors);
+                }
+            } else {
+                handleExpInAssign(errors);
+            }
+        } else {
+            if (currentIsExp()) {
+                handleExpInAssign(errors);
+            } else {
+                if (getCurrToken().getType() == TokenType.SEMICN) {
+                    addChild(new TokenNode(this.ts)); // semicolon
+                } else {
+                    errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+                }
+            }
+        }
+    }
+
+    public void handleExpInAssign(Errors errors) {
+        Exp exp = new Exp(this.ts);
+        exp.parse(errors);
+        addChild(exp);
+        if (getCurrToken().getType() == TokenType.SEMICN) {
+            addChild(new TokenNode(this.ts)); // semicolon
+        } else {
+            errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.i));
+        }
+    }
+
+    public boolean currentIsExp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.PLUS || t == TokenType.MINU || t == TokenType.NOT
+                || t == TokenType.IDENFR || t == TokenType.LPARENT || t == TokenType.INTCON;
+    }
+
+    public boolean isGetint() {
+        return getint;
+    }
+
+    public ArrayList<Exp> getExpList() {
+        ArrayList<Exp> expList = new ArrayList<>();
+        for (int i = 0; i < getChildren().size(); i++) {
+            if (getChild(i) instanceof Exp) {
+                expList.add((Exp) getChild(i));
+            }
+        }
+        return expList;
+    }
+
+    public Cond getCond() { //just for fortype stmt
+        for (int i = 0; i < getChildren().size(); i++) {
+            if (getChild(i) instanceof Cond) {
+                return (Cond) getChild(i);
+            }
+        }
+        return null;
+    }
+
+    public ForStmt getinitStmt() {
+        if (getChild(2) instanceof ForStmt) {
+            return (ForStmt) getChild(2);
+        }
+        return null;
+    }
+
+    public ForStmt getStepStmt() {
+        if (getChild(getChildren().size() - 3) instanceof ForStmt) {
+            return (ForStmt) getChild(getChildren().size() - 3);
+        }
+        return null;
+    }
+
+    public Stmt getBodyStmt() {
+        return (Stmt) getChild(getChildren().size() - 1);
+    }
+}

frontend/ast/exp/AddExp.java

@@ -1,73 +1,73 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.NodeStack;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import midend.symbol.SymbolManager;
-import error.Errors;
-
-public class AddExp extends Node {
-    public AddExp(TokenStream ts) {
-        super(SyntaxType.ADD_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            MulExp mep = new MulExp(this.ts);
-            mep.parse(errors);
-            stack.push(mep);
-            if (isAddOp()) {
-                stack.push(new TokenNode(ts)); // addop
-            } else {
-                break;
-            }
-        }
-        if (stack.size() == 1) {
-            this.addChild((MulExp) stack.pop());
-        } else {
-            AddExp temp = this;
-            while (stack.size() > 1) {
-                AddExp ae = new AddExp(this.ts);
-                MulExp mep = (MulExp) stack.pop();
-                TokenNode op = (TokenNode) stack.pop();
-                temp.addChild(ae);
-                temp.addChild(op);
-                temp.addChild(mep);
-                temp = ae;
-            }
-            temp.addChild((MulExp) stack.pop());
-        }
-    }
-
-    public boolean isAddOp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.PLUS || t == TokenType.MINU;
-    }
-
-    public int getType() {
-        if (getChildren().size() == 1) {
-            return ((MulExp) getChild(0)).getType();
-        } else {
-            return ((AddExp) getChild(0)).getType()
-                | ((MulExp) getChild(2)).getType();
-        }
-    }
-
-    public int getValue() {
-        if (getChild(0) instanceof MulExp) {
-            return ((MulExp) getChild(0)).getValue();
-        } else {
-            int left = ((AddExp) getChild(0)).getValue();
-            int right = ((MulExp) getChild(2)).getValue();
-            if (((TokenNode) getChild(1)).getType() == TokenType.PLUS) {
-                return left + right;
-            } else {
-                return left - right;
-            }
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import midend.symbol.SymbolManager;
+import error.Errors;
+
+public class AddExp extends Node {
+    public AddExp(TokenStream ts) {
+        super(SyntaxType.ADD_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            MulExp mep = new MulExp(this.ts);
+            mep.parse(errors);
+            stack.push(mep);
+            if (isAddOp()) {
+                stack.push(new TokenNode(ts)); // addop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            this.addChild((MulExp) stack.pop());
+        } else {
+            AddExp temp = this;
+            while (stack.size() > 1) {
+                AddExp ae = new AddExp(this.ts);
+                MulExp mep = (MulExp) stack.pop();
+                TokenNode op = (TokenNode) stack.pop();
+                temp.addChild(ae);
+                temp.addChild(op);
+                temp.addChild(mep);
+                temp = ae;
+            }
+            temp.addChild((MulExp) stack.pop());
+        }
+    }
+
+    public boolean isAddOp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.PLUS || t == TokenType.MINU;
+    }
+
+    public int getType() {
+        if (getChildren().size() == 1) {
+            return ((MulExp) getChild(0)).getType();
+        } else {
+            return ((AddExp) getChild(0)).getType()
+                | ((MulExp) getChild(2)).getType();
+        }
+    }
+
+    public int getValue() {
+        if (getChild(0) instanceof MulExp) {
+            return ((MulExp) getChild(0)).getValue();
+        } else {
+            int left = ((AddExp) getChild(0)).getValue();
+            int right = ((MulExp) getChild(2)).getValue();
+            if (((TokenNode) getChild(1)).getType() == TokenType.PLUS) {
+                return left + right;
+            } else {
+                return left - right;
+            }
+        }
+    }
+}

frontend/ast/exp/Cond.java

@@ -1,18 +1,18 @@
-package frontend.ast.exp;
-
-import frontend.ast.SyntaxType;
-import error.Errors;
-import frontend.lexer.TokenStream;
-import frontend.ast.Node;
-
-public class Cond extends Node {
-    public Cond(TokenStream ts) {
-        super(SyntaxType.COND_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        LOrExp lep = new LOrExp(this.ts);
-        lep.parse(errors);
-        addChild(lep);
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.SyntaxType;
+import error.Errors;
+import frontend.lexer.TokenStream;
+import frontend.ast.Node;
+
+public class Cond extends Node {
+    public Cond(TokenStream ts) {
+        super(SyntaxType.COND_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        LOrExp lep = new LOrExp(this.ts);
+        lep.parse(errors);
+        addChild(lep);
+    }
+}

frontend/ast/exp/EqExp.java

@@ -1,49 +1,49 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.NodeStack;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import error.Errors;
-
-public class EqExp extends Node {
-    public EqExp(TokenStream ts) {
-        super(SyntaxType.EQ_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            RelExp relexp = new RelExp(this.ts);
-            relexp.parse(errors);
-            stack.push(relexp);
-            if (isEqOp()) {
-                stack.push(new TokenNode(ts)); // eqop
-            } else {
-                break;
-            }
-        }
-        if(stack.size() == 1) {
-            this.addChild((RelExp)stack.pop());
-        } else {
-            EqExp temp = this;
-            while (stack.size() > 1) {
-                EqExp eep = new EqExp(this.ts);
-                RelExp relexp = (RelExp)stack.pop();
-                TokenNode eqop = (TokenNode)stack.pop();
-                temp.addChild(eep);
-                temp.addChild(eqop);
-                temp.addChild(relexp);
-                temp = eep;
-            }
-            temp.addChild((RelExp)stack.pop());
-        }
-    }
-
-    public boolean isEqOp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.EQL || t == TokenType.NEQ;
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+
+public class EqExp extends Node {
+    public EqExp(TokenStream ts) {
+        super(SyntaxType.EQ_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            RelExp relexp = new RelExp(this.ts);
+            relexp.parse(errors);
+            stack.push(relexp);
+            if (isEqOp()) {
+                stack.push(new TokenNode(ts)); // eqop
+            } else {
+                break;
+            }
+        }
+        if(stack.size() == 1) {
+            this.addChild((RelExp)stack.pop());
+        } else {
+            EqExp temp = this;
+            while (stack.size() > 1) {
+                EqExp eep = new EqExp(this.ts);
+                RelExp relexp = (RelExp)stack.pop();
+                TokenNode eqop = (TokenNode)stack.pop();
+                temp.addChild(eep);
+                temp.addChild(eqop);
+                temp.addChild(relexp);
+                temp = eep;
+            }
+            temp.addChild((RelExp)stack.pop());
+        }
+    }
+
+    public boolean isEqOp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.EQL || t == TokenType.NEQ;
+    }
+}

frontend/ast/exp/LAndExp.java

@@ -1,44 +1,44 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.NodeStack;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import error.Errors;
-
-public class LAndExp extends Node {
-    public LAndExp(TokenStream ts) {
-        super(SyntaxType.LAND_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            EqExp eep = new EqExp(this.ts);
-            eep.parse(errors);
-            stack.push(eep);
-            if (getCurrToken().getType() == TokenType.AND) {
-                stack.push(new TokenNode(ts)); // landop
-            } else {
-                break;
-            }
-        }
-        if (stack.size() == 1) {
-            this.addChild((EqExp)stack.pop());
-        } else {
-            LAndExp temp = this;
-            while(stack.size() > 1) {
-                LAndExp lae = new LAndExp(this.ts);
-                EqExp eep = (EqExp)stack.pop();
-                TokenNode landop = (TokenNode)stack.pop();
-                temp.addChild(lae);
-                temp.addChild(landop);
-                temp.addChild(eep);
-                temp = lae;
-            }
-            temp.addChild((EqExp)stack.pop());
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+
+public class LAndExp extends Node {
+    public LAndExp(TokenStream ts) {
+        super(SyntaxType.LAND_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            EqExp eep = new EqExp(this.ts);
+            eep.parse(errors);
+            stack.push(eep);
+            if (getCurrToken().getType() == TokenType.AND) {
+                stack.push(new TokenNode(ts)); // landop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            this.addChild((EqExp)stack.pop());
+        } else {
+            LAndExp temp = this;
+            while(stack.size() > 1) {
+                LAndExp lae = new LAndExp(this.ts);
+                EqExp eep = (EqExp)stack.pop();
+                TokenNode landop = (TokenNode)stack.pop();
+                temp.addChild(lae);
+                temp.addChild(landop);
+                temp.addChild(eep);
+                temp = lae;
+            }
+            temp.addChild((EqExp)stack.pop());
+        }
+    }
+}

frontend/ast/exp/LOrExp.java

@@ -1,44 +1,44 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.NodeStack;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import error.Errors;
-
-public class LOrExp extends Node {
-    public LOrExp(TokenStream ts) {
-        super(SyntaxType.LOR_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            LAndExp andexp = new LAndExp(this.ts);
-            andexp.parse(errors);
-            stack.push(andexp);
-            if (getCurrToken().getType() == TokenType.OR) {
-                stack.push(new TokenNode(ts)); // lorop
-            } else {
-                break;
-            }
-        }
-        if (stack.size() == 1) {
-            this.addChild((LAndExp)stack.pop());
-        } else {
-            LOrExp temp = this;
-            while(stack.size() > 1) {
-                LOrExp loe = new LOrExp(this.ts);
-                LAndExp lae = (LAndExp)stack.pop();
-                TokenNode lorop = (TokenNode)stack.pop();
-                temp.addChild(loe);
-                temp.addChild(lorop);
-                temp.addChild(lae);
-                temp = loe;
-            }
-            temp.addChild((LAndExp)stack.pop());
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+
+public class LOrExp extends Node {
+    public LOrExp(TokenStream ts) {
+        super(SyntaxType.LOR_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            LAndExp andexp = new LAndExp(this.ts);
+            andexp.parse(errors);
+            stack.push(andexp);
+            if (getCurrToken().getType() == TokenType.OR) {
+                stack.push(new TokenNode(ts)); // lorop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            this.addChild((LAndExp)stack.pop());
+        } else {
+            LOrExp temp = this;
+            while(stack.size() > 1) {
+                LOrExp loe = new LOrExp(this.ts);
+                LAndExp lae = (LAndExp)stack.pop();
+                TokenNode lorop = (TokenNode)stack.pop();
+                temp.addChild(loe);
+                temp.addChild(lorop);
+                temp.addChild(lae);
+                temp = loe;
+            }
+            temp.addChild((LAndExp)stack.pop());
+        }
+    }
+}

frontend/ast/exp/LVal.java

@@ -1,59 +1,59 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.ast.token.TokenNode;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import midend.symbol.SymbolManager;
-import midend.symbol.Symbol;
-import midend.symbol.ArraySymbol;
-import error.Errors;
-import error.Error;
-import error.ErrorType;
-
-public class LVal extends Node {
-    public LVal(TokenStream ts) {
-        super(SyntaxType.LVAL_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        addChild(new TokenNode(this.ts)); // idenfr
-        if (getCurrToken().getType() == TokenType.LBRACK) {
-            addChild(new TokenNode(this.ts)); // lbrack
-            Exp exp = new Exp(this.ts);
-            exp.parse(errors);
-            addChild(exp);
-            if (getCurrToken().getType() == TokenType.RBRACK) {
-                addChild(new TokenNode(this.ts)); // rbrack
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.k));
-            }
-        }
-    }
-
-    public int getType() {
-        if (getChildren().size() == 1) {
-            TokenNode idenfr = (TokenNode) getChild(0);
-            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
-            if (symbol instanceof ArraySymbol) {
-                return 1;
-            }
-            return 0;
-        } else {
-            return 0;
-        }
-    }
-
-    public int getValue() {
-        TokenNode idenfr = (TokenNode) getChild(0); //idenfr一定是个常量，可在符号表找到且有值
-        if (getChildren().size() == 1) {
-            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
-            return symbol.getValue(0);
-        } else {
-            int index = ((Exp) getChild(2)).getValue();
-            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
-            return symbol.getValue(index);
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.ast.token.TokenNode;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import midend.symbol.SymbolManager;
+import midend.symbol.Symbol;
+import midend.symbol.ArraySymbol;
+import error.Errors;
+import error.Error;
+import error.ErrorType;
+
+public class LVal extends Node {
+    public LVal(TokenStream ts) {
+        super(SyntaxType.LVAL_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        addChild(new TokenNode(this.ts)); // idenfr
+        if (getCurrToken().getType() == TokenType.LBRACK) {
+            addChild(new TokenNode(this.ts)); // lbrack
+            Exp exp = new Exp(this.ts);
+            exp.parse(errors);
+            addChild(exp);
+            if (getCurrToken().getType() == TokenType.RBRACK) {
+                addChild(new TokenNode(this.ts)); // rbrack
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.k));
+            }
+        }
+    }
+
+    public int getType() {
+        if (getChildren().size() == 1) {
+            TokenNode idenfr = (TokenNode) getChild(0);
+            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
+            if (symbol instanceof ArraySymbol) {
+                return 1;
+            }
+            return 0;
+        } else {
+            return 0;
+        }
+    }
+
+    public int getValue() {
+        TokenNode idenfr = (TokenNode) getChild(0); //idenfr一定是个常量，可在符号表找到且有值
+        if (getChildren().size() == 1) {
+            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
+            return symbol.getValue(0);
+        } else {
+            int index = ((Exp) getChild(2)).getValue();
+            Symbol symbol = SymbolManager.getSymbol(idenfr.getName());
+            return symbol.getValue(index);
+        }
+    }
+}

frontend/ast/exp/MulExp.java

@@ -1,75 +1,75 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import frontend.ast.NodeStack;
-import midend.symbol.SymbolManager;
-import error.Errors;
-
-public class MulExp extends Node {
-    public MulExp(TokenStream ts) {
-        super(SyntaxType.MUL_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            UnaryExp uep = new UnaryExp(this.ts);
-            uep.parse(errors);
-            stack.push(uep);
-            if (isMulOp()) {
-                stack.push(new TokenNode(ts)); // mulop
-            } else {
-                break;
-            }
-        }
-        if (stack.size() == 1) {
-            addChild((UnaryExp)stack.pop());
-        } else {
-            MulExp temp = this;
-            while (stack.size() > 1) {
-                MulExp mep = new MulExp(this.ts);
-                UnaryExp uep = (UnaryExp) stack.pop();
-                TokenNode mulop = (TokenNode) stack.pop();
-                temp.addChild(mep);
-                temp.addChild(mulop);
-                temp.addChild(uep);
-                temp = mep;
-            }
-            temp.addChild((UnaryExp)stack.pop());
-        }
-    }
-
-    public boolean isMulOp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.MULT || t == TokenType.DIV || t == TokenType.MOD;
-    }
-
-    public int getType() {
-        if (getChildren().size() == 1) {
-            return ((UnaryExp) getChild(0)).getType();
-        } else {
-            return ((MulExp) getChild(0)).getType()
-                | ((UnaryExp) getChild(2)).getType();
-        }
-    }
-
-    public int getValue() {
-        if (getChild(0) instanceof UnaryExp) {
-            return ((UnaryExp) getChild(0)).getValue();
-        } else {
-            int left = ((MulExp) getChild(0)).getValue();
-            int right = ((UnaryExp) getChild(2)).getValue();
-            if (((TokenNode) getChild(1)).getType() == TokenType.MULT) {
-                return left * right;
-            } else if (((TokenNode) getChild(1)).getType() == TokenType.DIV) {
-                return left / right;
-            } else {
-                return left % right;
-            }
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import frontend.ast.NodeStack;
+import midend.symbol.SymbolManager;
+import error.Errors;
+
+public class MulExp extends Node {
+    public MulExp(TokenStream ts) {
+        super(SyntaxType.MUL_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            UnaryExp uep = new UnaryExp(this.ts);
+            uep.parse(errors);
+            stack.push(uep);
+            if (isMulOp()) {
+                stack.push(new TokenNode(ts)); // mulop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            addChild((UnaryExp)stack.pop());
+        } else {
+            MulExp temp = this;
+            while (stack.size() > 1) {
+                MulExp mep = new MulExp(this.ts);
+                UnaryExp uep = (UnaryExp) stack.pop();
+                TokenNode mulop = (TokenNode) stack.pop();
+                temp.addChild(mep);
+                temp.addChild(mulop);
+                temp.addChild(uep);
+                temp = mep;
+            }
+            temp.addChild((UnaryExp)stack.pop());
+        }
+    }
+
+    public boolean isMulOp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.MULT || t == TokenType.DIV || t == TokenType.MOD;
+    }
+
+    public int getType() {
+        if (getChildren().size() == 1) {
+            return ((UnaryExp) getChild(0)).getType();
+        } else {
+            return ((MulExp) getChild(0)).getType()
+                | ((UnaryExp) getChild(2)).getType();
+        }
+    }
+
+    public int getValue() {
+        if (getChild(0) instanceof UnaryExp) {
+            return ((UnaryExp) getChild(0)).getValue();
+        } else {
+            int left = ((MulExp) getChild(0)).getValue();
+            int right = ((UnaryExp) getChild(2)).getValue();
+            if (((TokenNode) getChild(1)).getType() == TokenType.MULT) {
+                return left * right;
+            } else if (((TokenNode) getChild(1)).getType() == TokenType.DIV) {
+                return left / right;
+            } else {
+                return left % right;
+            }
+        }
+    }
+}

frontend/ast/exp/NumberExp.java

@@ -1,21 +1,21 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import error.Errors;
-import frontend.ast.token.TokenNode;
-
-public class NumberExp extends Node {
-    public NumberExp(TokenStream ts) {
-        super(SyntaxType.NUMBER, ts);
-    }
-
-    public void parse(Errors errors) {
-        addChild(new TokenNode(ts)); //intconst
-    }
-
-    public int getValue() {
-        return Integer.parseInt(((TokenNode) getChild(0)).getValue());
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import error.Errors;
+import frontend.ast.token.TokenNode;
+
+public class NumberExp extends Node {
+    public NumberExp(TokenStream ts) {
+        super(SyntaxType.NUMBER, ts);
+    }
+
+    public void parse(Errors errors) {
+        addChild(new TokenNode(ts)); //intconst
+    }
+
+    public int getValue() {
+        return Integer.parseInt(((TokenNode) getChild(0)).getValue());
+    }
+}

frontend/ast/exp/PrimaryExp.java

@@ -1,58 +1,58 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import error.Errors;
-import error.Error;
-import error.ErrorType;
-
-public class PrimaryExp extends Node {
-    public PrimaryExp(TokenStream ts) {
-        super(SyntaxType.PRIMARY_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        if (getCurrToken().getType() == TokenType.LPARENT) {
-            addChild(new TokenNode(ts)); // lparent
-            Exp exp = new Exp(this.ts);
-            exp.parse(errors);
-            addChild(exp);
-            if (getCurrToken().getType() == TokenType.RPARENT) {
-                addChild(new TokenNode(ts)); // rparent
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
-            }
-        } else if (getCurrToken().getType() == TokenType.IDENFR) {
-            LVal lval = new LVal(this.ts);
-            lval.parse(errors);
-            addChild(lval);
-        } else {
-            NumberExp num = new NumberExp(this.ts);
-            num.parse(errors);
-            addChild(num);
-        }
-    }
-
-    public int getType() {
-        if (getChild(0) instanceof TokenNode) {
-            return ((Exp) getChild(1)).getType();
-        } else if (getChild(0) instanceof LVal) {
-            return ((LVal) getChild(0)).getType();
-        } else {
-            return 0;
-        }
-    }
-
-    public int getValue() {
-        if (getChild(0) instanceof TokenNode) {
-            return ((Exp) getChild(1)).getValue();
-        } else if (getChild(0) instanceof LVal) {
-            return ((LVal) getChild(0)).getValue();
-        } else {
-            return ((NumberExp) getChild(0)).getValue();
-        }
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+import error.Error;
+import error.ErrorType;
+
+public class PrimaryExp extends Node {
+    public PrimaryExp(TokenStream ts) {
+        super(SyntaxType.PRIMARY_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        if (getCurrToken().getType() == TokenType.LPARENT) {
+            addChild(new TokenNode(ts)); // lparent
+            Exp exp = new Exp(this.ts);
+            exp.parse(errors);
+            addChild(exp);
+            if (getCurrToken().getType() == TokenType.RPARENT) {
+                addChild(new TokenNode(ts)); // rparent
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
+            }
+        } else if (getCurrToken().getType() == TokenType.IDENFR) {
+            LVal lval = new LVal(this.ts);
+            lval.parse(errors);
+            addChild(lval);
+        } else {
+            NumberExp num = new NumberExp(this.ts);
+            num.parse(errors);
+            addChild(num);
+        }
+    }
+
+    public int getType() {
+        if (getChild(0) instanceof TokenNode) {
+            return ((Exp) getChild(1)).getType();
+        } else if (getChild(0) instanceof LVal) {
+            return ((LVal) getChild(0)).getType();
+        } else {
+            return 0;
+        }
+    }
+
+    public int getValue() {
+        if (getChild(0) instanceof TokenNode) {
+            return ((Exp) getChild(1)).getValue();
+        } else if (getChild(0) instanceof LVal) {
+            return ((LVal) getChild(0)).getValue();
+        } else {
+            return ((NumberExp) getChild(0)).getValue();
+        }
+    }
+}

frontend/ast/exp/RelExp.java

@@ -1,50 +1,50 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.NodeStack;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import error.Errors;
-
-public class RelExp extends Node {
-    public RelExp(TokenStream ts) {
-        super(SyntaxType.REL_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        NodeStack stack = new NodeStack();
-        while (true) {
-            AddExp addexp = new AddExp(this.ts);
-            addexp.parse(errors);
-            stack.push(addexp);
-            if (isRelOp()) {
-                stack.push(new TokenNode(ts)); // relop
-            } else {
-                break;
-            }
-        }
-        if (stack.size() == 1) {
-            this.addChild((AddExp)stack.pop());
-        } else {
-            RelExp temp = this;
-            while(stack.size() > 1) {
-                RelExp rexp = new RelExp(this.ts);
-                AddExp addexp = (AddExp)stack.pop();
-                TokenNode relop = (TokenNode)stack.pop();
-                temp.addChild(rexp);
-                temp.addChild(relop);
-                temp.addChild(addexp);
-                temp = rexp;
-            }
-            temp.addChild((AddExp)stack.pop());
-        }
-    }
-
-    public boolean isRelOp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.LSS || t == TokenType.GRE
-                || t == TokenType.LEQ || t == TokenType.GEQ;
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.NodeStack;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import error.Errors;
+
+public class RelExp extends Node {
+    public RelExp(TokenStream ts) {
+        super(SyntaxType.REL_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        NodeStack stack = new NodeStack();
+        while (true) {
+            AddExp addexp = new AddExp(this.ts);
+            addexp.parse(errors);
+            stack.push(addexp);
+            if (isRelOp()) {
+                stack.push(new TokenNode(ts)); // relop
+            } else {
+                break;
+            }
+        }
+        if (stack.size() == 1) {
+            this.addChild((AddExp)stack.pop());
+        } else {
+            RelExp temp = this;
+            while(stack.size() > 1) {
+                RelExp rexp = new RelExp(this.ts);
+                AddExp addexp = (AddExp)stack.pop();
+                TokenNode relop = (TokenNode)stack.pop();
+                temp.addChild(rexp);
+                temp.addChild(relop);
+                temp.addChild(addexp);
+                temp = rexp;
+            }
+            temp.addChild((AddExp)stack.pop());
+        }
+    }
+
+    public boolean isRelOp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.LSS || t == TokenType.GRE
+                || t == TokenType.LEQ || t == TokenType.GEQ;
+    }
+}

frontend/ast/exp/UnaryExp.java

@@ -1,124 +1,124 @@
-package frontend.ast.exp;
-
-import java.util.ArrayList;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import frontend.ast.token.TokenNode;
-import frontend.ast.func.FuncRParams;
-import midend.symbol.FuncSymbol;
-import midend.symbol.SymbolManager;
-import error.Errors;
-
-import error.Error;
-import error.ErrorType;
-
-public class UnaryExp extends Node {
-    public UnaryExp(TokenStream ts) {
-        super(SyntaxType.UNARY_EXP, ts);
-    }
-
-    public void parse(Errors errors) {
-        if (isUnaryOp()) {
-            UnaryOp uop = new UnaryOp(ts);
-            uop.parse(errors);
-            addChild(uop);
-            UnaryExp uep = new UnaryExp(ts);
-            uep.parse(errors);
-            addChild(uep);
-        } else if (getCurrToken().getType() == TokenType.IDENFR
-                && this.ts.peek(1).getType() == TokenType.LPARENT) {
-            addChild(new TokenNode(ts)); // idenfr
-            addChild(new TokenNode(ts)); // lparent
-            if (isExp()) {
-                FuncRParams frp = new FuncRParams(ts);
-                frp.parse(errors);
-                addChild(frp);
-            }
-            if (getCurrToken().getType() == TokenType.RPARENT) {
-                addChild(new TokenNode(ts)); // rparent
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
-            }
-        } else {
-            PrimaryExp pme = new PrimaryExp(ts);
-            pme.parse(errors);
-            addChild(pme);
-        }
-    }
-
-    public boolean isUnaryOp() {
-        return getCurrToken().getType() == TokenType.PLUS
-                || getCurrToken().getType() == TokenType.MINU
-                || getCurrToken().getType() == TokenType.NOT;
-    }
-
-    public boolean isExp() {
-        TokenType t = getCurrToken().getType();
-        return t == TokenType.PLUS || t == TokenType.MINU || t == TokenType.NOT
-                || t == TokenType.IDENFR || t == TokenType.LPARENT || t == TokenType.INTCON;
-    }
-
-    public void handleFuncCall(Errors errors) { // 当其为函数调用形式时才会调用
-        TokenNode funcIdenfr = (TokenNode) getChild(0);
-        if (funcIdenfr.getName().equals("getint")) {
-            if (getChildren().size() == 4) {
-                errors.addError(new Error(funcIdenfr.getLine(), ErrorType.d));
-            }
-            return;
-        }
-        FuncSymbol funcSymbol = (FuncSymbol) SymbolManager.getSymbol(funcIdenfr.getName());
-        if (funcSymbol == null) {
-            errors.addError(new Error(funcIdenfr.getLine(), ErrorType.c));
-            return;
-        }
-        int fparaNum = funcSymbol.getParamNum();
-        int rparaNum = 0;
-        if (getChildren().size() >= 3 && getChild(2) instanceof FuncRParams) {
-            FuncRParams frp = (FuncRParams) getChild(2);
-            rparaNum = frp.getParamNum();
-            if (rparaNum == fparaNum) {
-                frp.checkParamType(funcSymbol, errors, funcIdenfr.getLine());
-            }
-        }
-        if (fparaNum != rparaNum) {
-            errors.addError(new Error(funcIdenfr.getLine(), ErrorType.d));
-        }
-    }
-
-    public int getType() {
-        if (getChild(0) instanceof PrimaryExp) {
-            return ((PrimaryExp) getChild(0)).getType();
-        } else if (getChild(0) instanceof TokenNode) {
-            return 0;
-        } else {
-            return ((UnaryExp) getChild(1)).getType();
-        }
-    }
-
-    public int getValue() {
-        if (getChild(0) instanceof UnaryOp) {
-            UnaryOp uop = (UnaryOp) getChild(0);
-            TokenNode opToken = (TokenNode) uop.getChild(0);
-            return opToken.getType() == TokenType.PLUS ? ((UnaryExp) getChild(1)).getValue()
-                    : -((UnaryExp) getChild(1)).getValue();
-        } else if (getChild(0) instanceof PrimaryExp) {
-            return ((PrimaryExp) getChild(0)).getValue();
-        } else {
-            return 0; // 0表示这个是函数，getvalue只是对于常量或常量表达式取值，所以正常情况调用getvalue函数时是不会跳转到这个分支的
-        }
-    }
-
-    public ArrayList<Exp> getParamList() {
-        if (!(getChild(0) instanceof TokenNode)) {
-            return null;
-        } else {
-            if (getChildren().size() >= 3 && (getChild(2) instanceof FuncRParams)) {
-                return ((FuncRParams) getChild(2)).getParamList();
-            }
-            return new ArrayList<Exp>();
-        }
-    }
-}
+package frontend.ast.exp;
+
+import java.util.ArrayList;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import frontend.ast.token.TokenNode;
+import frontend.ast.func.FuncRParams;
+import midend.symbol.FuncSymbol;
+import midend.symbol.SymbolManager;
+import error.Errors;
+
+import error.Error;
+import error.ErrorType;
+
+public class UnaryExp extends Node {
+    public UnaryExp(TokenStream ts) {
+        super(SyntaxType.UNARY_EXP, ts);
+    }
+
+    public void parse(Errors errors) {
+        if (isUnaryOp()) {
+            UnaryOp uop = new UnaryOp(ts);
+            uop.parse(errors);
+            addChild(uop);
+            UnaryExp uep = new UnaryExp(ts);
+            uep.parse(errors);
+            addChild(uep);
+        } else if (getCurrToken().getType() == TokenType.IDENFR
+                && this.ts.peek(1).getType() == TokenType.LPARENT) {
+            addChild(new TokenNode(ts)); // idenfr
+            addChild(new TokenNode(ts)); // lparent
+            if (isExp()) {
+                FuncRParams frp = new FuncRParams(ts);
+                frp.parse(errors);
+                addChild(frp);
+            }
+            if (getCurrToken().getType() == TokenType.RPARENT) {
+                addChild(new TokenNode(ts)); // rparent
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.j));
+            }
+        } else {
+            PrimaryExp pme = new PrimaryExp(ts);
+            pme.parse(errors);
+            addChild(pme);
+        }
+    }
+
+    public boolean isUnaryOp() {
+        return getCurrToken().getType() == TokenType.PLUS
+                || getCurrToken().getType() == TokenType.MINU
+                || getCurrToken().getType() == TokenType.NOT;
+    }
+
+    public boolean isExp() {
+        TokenType t = getCurrToken().getType();
+        return t == TokenType.PLUS || t == TokenType.MINU || t == TokenType.NOT
+                || t == TokenType.IDENFR || t == TokenType.LPARENT || t == TokenType.INTCON;
+    }
+
+    public void handleFuncCall(Errors errors) { // 当其为函数调用形式时才会调用
+        TokenNode funcIdenfr = (TokenNode) getChild(0);
+        if (funcIdenfr.getName().equals("getint")) {
+            if (getChildren().size() == 4) {
+                errors.addError(new Error(funcIdenfr.getLine(), ErrorType.d));
+            }
+            return;
+        }
+        FuncSymbol funcSymbol = (FuncSymbol) SymbolManager.getSymbol(funcIdenfr.getName());
+        if (funcSymbol == null) {
+            errors.addError(new Error(funcIdenfr.getLine(), ErrorType.c));
+            return;
+        }
+        int fparaNum = funcSymbol.getParamNum();
+        int rparaNum = 0;
+        if (getChildren().size() >= 3 && getChild(2) instanceof FuncRParams) {
+            FuncRParams frp = (FuncRParams) getChild(2);
+            rparaNum = frp.getParamNum();
+            if (rparaNum == fparaNum) {
+                frp.checkParamType(funcSymbol, errors, funcIdenfr.getLine());
+            }
+        }
+        if (fparaNum != rparaNum) {
+            errors.addError(new Error(funcIdenfr.getLine(), ErrorType.d));
+        }
+    }
+
+    public int getType() {
+        if (getChild(0) instanceof PrimaryExp) {
+            return ((PrimaryExp) getChild(0)).getType();
+        } else if (getChild(0) instanceof TokenNode) {
+            return 0;
+        } else {
+            return ((UnaryExp) getChild(1)).getType();
+        }
+    }
+
+    public int getValue() {
+        if (getChild(0) instanceof UnaryOp) {
+            UnaryOp uop = (UnaryOp) getChild(0);
+            TokenNode opToken = (TokenNode) uop.getChild(0);
+            return opToken.getType() == TokenType.PLUS ? ((UnaryExp) getChild(1)).getValue()
+                    : -((UnaryExp) getChild(1)).getValue();
+        } else if (getChild(0) instanceof PrimaryExp) {
+            return ((PrimaryExp) getChild(0)).getValue();
+        } else {
+            return 0; // 0表示这个是函数，getvalue只是对于常量或常量表达式取值，所以正常情况调用getvalue函数时是不会跳转到这个分支的
+        }
+    }
+
+    public ArrayList<Exp> getParamList() {
+        if (!(getChild(0) instanceof TokenNode)) {
+            return null;
+        } else {
+            if (getChildren().size() >= 3 && (getChild(2) instanceof FuncRParams)) {
+                return ((FuncRParams) getChild(2)).getParamList();
+            }
+            return new ArrayList<Exp>();
+        }
+    }
+}

frontend/ast/exp/UnaryOp.java

@@ -1,17 +1,17 @@
-package frontend.ast.exp;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import error.Errors;
-import frontend.ast.token.TokenNode;
-
-public class UnaryOp extends Node {
-    public UnaryOp(TokenStream ts) {
-        super(SyntaxType.UNARY_OP, ts);
-    }
-    
-    public void parse(Errors errors) {
-        addChild(new TokenNode(ts)); // unary op
-    }
-}
+package frontend.ast.exp;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import error.Errors;
+import frontend.ast.token.TokenNode;
+
+public class UnaryOp extends Node {
+    public UnaryOp(TokenStream ts) {
+        super(SyntaxType.UNARY_OP, ts);
+    }
+    
+    public void parse(Errors errors) {
+        addChild(new TokenNode(ts)); // unary op
+    }
+}

frontend/ast/func/FuncFParam.java

@@ -1,49 +1,49 @@
-package frontend.ast.func;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-
-import midend.symbol.Symbol;
-import midend.symbol.SymbolType;
-import midend.symbol.ArraySymbol;
-
-import error.Errors;
-import frontend.ast.token.TokenNode;
-import error.ErrorType;
-import error.Error;
-
-public class FuncFParam extends Node {
-    public FuncFParam(TokenStream ts) {
-        super(SyntaxType.FUNC_FORMAL_PARAM, ts);
-    }
-
-    public void parse(Errors errors) {
-        TokenNode intkk = new TokenNode(this.ts);
-        addChild(intkk);
-        TokenNode ident = new TokenNode(this.ts);
-        addChild(ident);
-        if (getCurrToken().getType() == TokenType.LBRACK) {
-            TokenNode lbrack = new TokenNode(this.ts);
-            addChild(lbrack);
-            if (getCurrToken().getType() == TokenType.RBRACK) {
-                TokenNode rbrack = new TokenNode(this.ts);
-                addChild(rbrack);
-            } else {
-                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.k));
-            }
-        }
-    }
-
-    public Symbol getSymbol() {
-        if (getChildren().size() == 2) {
-            TokenNode tn = (TokenNode) getChild(1);
-            return new Symbol(tn.getName(), SymbolType.INT, tn.getLine());
-        } else {
-            TokenNode tn = (TokenNode) getChild(1);
-            return new ArraySymbol(tn.getName(), SymbolType.INT_ARRAY, tn.getLine(), -1);   
-            //这里不求维数，因为函数形参为数组只是相当于一个指针
-        }
-    }
+package frontend.ast.func;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+
+import midend.symbol.Symbol;
+import midend.symbol.SymbolType;
+import midend.symbol.ArraySymbol;
+
+import error.Errors;
+import frontend.ast.token.TokenNode;
+import error.ErrorType;
+import error.Error;
+
+public class FuncFParam extends Node {
+    public FuncFParam(TokenStream ts) {
+        super(SyntaxType.FUNC_FORMAL_PARAM, ts);
+    }
+
+    public void parse(Errors errors) {
+        TokenNode intkk = new TokenNode(this.ts);
+        addChild(intkk);
+        TokenNode ident = new TokenNode(this.ts);
+        addChild(ident);
+        if (getCurrToken().getType() == TokenType.LBRACK) {
+            TokenNode lbrack = new TokenNode(this.ts);
+            addChild(lbrack);
+            if (getCurrToken().getType() == TokenType.RBRACK) {
+                TokenNode rbrack = new TokenNode(this.ts);
+                addChild(rbrack);
+            } else {
+                errors.addError(new Error(this.ts.peek(-1).getLine(), ErrorType.k));
+            }
+        }
+    }
+
+    public Symbol getSymbol() {
+        if (getChildren().size() == 2) {
+            TokenNode tn = (TokenNode) getChild(1);
+            return new Symbol(tn.getName(), SymbolType.INT, tn.getLine());
+        } else {
+            TokenNode tn = (TokenNode) getChild(1);
+            return new ArraySymbol(tn.getName(), SymbolType.INT_ARRAY, tn.getLine(), -1);   
+            //这里不求维数，因为函数形参为数组只是相当于一个指针
+        }
+    }
 }

frontend/ast/func/FuncRParams.java

@@ -1,57 +1,57 @@
-package frontend.ast.func;
-
-import java.util.ArrayList;
-
-import frontend.ast.Node;
-import frontend.ast.SyntaxType;
-import frontend.lexer.TokenStream;
-import frontend.lexer.TokenType;
-import error.Errors;
-import error.Error;
-import error.ErrorType;
-import frontend.ast.token.TokenNode;
-import frontend.ast.exp.Exp;
-import midend.symbol.FuncSymbol;
-
-public class FuncRParams extends Node {
-    public FuncRParams(TokenStream ts) {
-        super(SyntaxType.FUNC_REAL_PARAM_S, ts);
-    }
-
-    public void parse(Errors errors) {
-        while (true) {
-            Exp ep = new Exp(ts);
-            ep.parse(errors);
-            addChild(ep);
-            if (getCurrToken().getType() == TokenType.COMMA) {
-                addChild(new TokenNode(ts)); // comma
-            } else {
-                break;
-            }
-        }
-    }
-
-    public int getParamNum() {
-        return (getChildren().size() + 1) / 2;
-    }
-
-    public void checkParamType(FuncSymbol funcSymbol, Errors errors, int line) {
-        int fparaNum = funcSymbol.getParamNum();
-        int rparaNum = getParamNum();
-        int size = rparaNum < fparaNum ? rparaNum : fparaNum;
-        for (int i = 0; i < size; i++) {
-            Exp exp = (Exp) getChild(i * 2);
-            if (exp.getType() != funcSymbol.getParamType(i)) {
-                errors.addError(new Error(line, ErrorType.e));
-            }
-        }
-    }
-
-    public ArrayList<Exp> getParamList() {
-        ArrayList<Exp> paramList = new ArrayList<Exp>();
-        for (int i = 0; i < getChildren().size(); i += 2) {
-            paramList.add((Exp) getChild(i));
-        }
-        return paramList;
-    }
-}
+package frontend.ast.func;
+
+import java.util.ArrayList;
+
+import frontend.ast.Node;
+import frontend.ast.SyntaxType;
+import frontend.lexer.TokenStream;
+import frontend.lexer.TokenType;
+import error.Errors;
+import error.Error;
+import error.ErrorType;
+import frontend.ast.token.TokenNode;
+import frontend.ast.exp.Exp;
+import midend.symbol.FuncSymbol;
+
+public class FuncRParams extends Node {
+    public FuncRParams(TokenStream ts) {
+        super(SyntaxType.FUNC_REAL_PARAM_S, ts);
+    }
+
+    public void parse(Errors errors) {
+        while (true) {
+            Exp ep = new Exp(ts);
+            ep.parse(errors);
+            addChild(ep);
+            if (getCurrToken().getType() == TokenType.COMMA) {
+                addChild(new TokenNode(ts)); // comma
+            } else {
+                break;
+            }
+        }
+    }
+
+    public int getParamNum() {
+        return (getChildren().size() + 1) / 2;
+    }
+
+    public void checkParamType(FuncSymbol funcSymbol, Errors errors, int line) {
+        int fparaNum = funcSymbol.getParamNum();
+        int rparaNum = getParamNum();
+        int size = rparaNum < fparaNum ? rparaNum : fparaNum;
+        for (int i = 0; i < size; i++) {
+            Exp exp = (Exp) getChild(i * 2);
+            if (exp.getType() != funcSymbol.getParamType(i)) {
+                errors.addError(new Error(line, ErrorType.e));
+            }
+        }
+    }
+
+    public ArrayList<Exp> getParamList() {
+        ArrayList<Exp> paramList = new ArrayList<Exp>();
+        for (int i = 0; i < getChildren().size(); i += 2) {
+            paramList.add((Exp) getChild(i));
+        }
+        return paramList;
+    }
+}

frontend/lexer/Lexer.java

@@ -1,245 +1,245 @@
-package frontend.lexer;
-
-import java.util.ArrayList;
-
-import error.Error;
-import error.ErrorType;
-import error.Errors;
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import java.io.IOException;
-
-public class Lexer {
-    private String input;
-    private ArrayList<Token> tokens;
-    private int position;
-    private int line;
-    private char currentChar;
-
-    public Lexer(String input) {
-        this.input = input;
-        this.tokens = new ArrayList<Token>();
-        this.position = 0;
-        this.line = 1;
-    }
-
-    public void lex(Errors errors) {
-        int sigComment = 0;
-        while (this.position < this.input.length()) {
-            currentChar = this.input.charAt(this.position);
-            if (currentChar == ' ' || currentChar == '\t') {
-                this.position++;
-                continue;
-            }
-            if (currentChar == '\n' || currentChar == '\r') {
-                if (currentChar == '\r') {
-                    if (this.position + 1 < this.input.length() &&
-                            this.input.charAt(this.position + 1) == '\n') {
-                        this.position++;
-                    }
-                }
-                this.line++;
-                this.position++;
-                if (sigComment == 1) {
-                    sigComment = 0;
-                }
-                continue;
-            }
-            if (sigComment == 0) {
-                if (currentChar == '/') {
-                    if (this.position + 1 < this.input.length() &&
-                            this.input.charAt(this.position + 1) == '/') {
-                        sigComment = 1;
-                        this.position += 2;
-                        continue;
-                    }
-                    if (this.position + 1 < this.input.length() &&
-                            this.input.charAt(this.position + 1) == '*') {
-                        sigComment = 2;
-                        this.position += 2;
-                        continue;
-                    }
-                }
-                if (this.isIntCons()) {
-                    lexInt();
-                    continue;
-                }
-                if (this.isStrCons()) {
-                    lexStr();
-                    continue;
-                }
-                if (this.isIdenfr()) {
-                    lexIdenfr();
-                    continue;
-                }
-                lexOp(errors);
-            }
-            if (sigComment == 2) {
-                if (this.position + 1 < this.input.length() &&
-                        this.currentChar == '*' && this.input.charAt(this.position + 1) == '/') {
-                    sigComment = 0;
-                    this.position += 2;
-                    continue;
-                }
-            }
-            if (sigComment != 0) {
-                this.position++;
-            }
-        }
-    }
-
-    public boolean isIntCons() {
-        return Character.isDigit(this.currentChar);
-    }
-
-    public boolean isStrCons() {
-        return this.currentChar == '"';
-    }
-
-    public boolean isIdenfr() {
-        return Character.isLowerCase(this.currentChar) || Character.isUpperCase(this.currentChar)
-                || this.currentChar == '_';
-    }
-
-    public boolean isNotWp() {
-        return !Character.isWhitespace(this.currentChar);
-    }
-
-    public boolean isOp() {
-        return !this.isIntCons() && !this.isStrCons() && !this.isIdenfr();
-    }
-
-    public void lexInt() {
-        StringBuilder sb = new StringBuilder();
-        while (this.position < this.input.length() && this.isIntCons()) {
-            sb.append(this.currentChar);
-            this.position++;
-            updateCurrentChar();
-        }
-        this.tokens.add(new Token(sb.toString(), this.line));
-    }
-
-    public void lexStr() {
-        StringBuilder sb = new StringBuilder();
-        sb.append(this.currentChar);
-        this.position++;
-        updateCurrentChar();
-        while (this.position < this.input.length() && this.currentChar != '"') {
-            sb.append(this.currentChar);
-            this.position++;
-            updateCurrentChar();
-        }
-        if (this.position < this.input.length() && this.currentChar == '"') {
-            sb.append(this.currentChar);
-            this.position++;
-        }
-        this.tokens.add(new Token(sb.toString(), this.line));
-    }
-
-    public void lexIdenfr() {
-        StringBuilder sb = new StringBuilder();
-        while (this.position < this.input.length() && (this.isIdenfr() || this.isIntCons())) {
-            sb.append(this.currentChar);
-            this.position++;
-            updateCurrentChar();
-        }
-        this.tokens.add(new Token(sb.toString(), this.line));
-    }
-
-    public void lexOp(Errors errors) {
-        StringBuilder sb = new StringBuilder();
-        if (this.currentChar == '/' && this.position + 1 < this.input.length() &&
-                (this.input.charAt(this.position + 1) == '/' ||
-                        this.input.charAt(this.position + 1) == '*')) {
-            return;
-        }
-        sb.append(this.currentChar);
-        switch (this.currentChar) {
-            case '&':
-                readAnd(sb);
-                break;
-            case '|':
-                readOr(sb);
-                break;
-            case '<':
-                readEq(sb);
-                break;
-            case '>':
-                readEq(sb);
-                break;
-            case '=':
-                readEq(sb);
-                break;
-            case '!':
-                readEq(sb);
-                break;
-            default:
-                break;
-        }
-        this.position++;
-        if (sb.toString().equals("&") || sb.toString().equals("|")) {
-            errors.addError(new Error(this.line, ErrorType.a));
-        }
-        this.tokens.add(new Token(sb.toString(), this.line));
-    }
-
-    public void readAnd(StringBuilder sb) {
-        if (this.position + 1 < this.input.length() &&
-                this.input.charAt(this.position + 1) == '&') {
-            this.position++;
-            currentChar = this.input.charAt(this.position);
-            sb.append(currentChar);
-        }
-    }
-
-    public void readOr(StringBuilder sb) {
-        if (this.position + 1 < this.input.length() &&
-                this.input.charAt(this.position + 1) == '|') {
-            this.position++;
-            currentChar = this.input.charAt(this.position);
-            sb.append(currentChar);
-        }
-    }
-
-    public void readEq(StringBuilder sb) {
-        if (this.position + 1 < this.input.length() &&
-                this.input.charAt(this.position + 1) == '=') {
-            this.position++;
-            currentChar = this.input.charAt(this.position);
-            sb.append(currentChar);
-        }
-    }
-
-    public void updateCurrentChar() {
-        if (this.position < this.input.length()) {
-            currentChar = this.input.charAt(this.position);
-        }
-    }
-
-    public void printTokens() {
-        for (Token token : this.tokens) {
-            token.adjustType();
-            System.out.println(token.getType() + " " + token.getValue() + " " + token.getLine());
-        }
-    }
-
-    public void writeToFile(String fileName) {
-        try {
-            StringBuilder sb = new StringBuilder();
-            for (Token token : this.tokens) {
-                token.adjustType();
-                sb.append(token.toString());
-            }
-            Files.write(Paths.get(fileName), sb.toString().getBytes());
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    public ArrayList<Token> getTokens() {
-        for (Token token : this.tokens) {
-            token.adjustType();
-        }
-        return this.tokens;
-    }
-}
+package frontend.lexer;
+
+import java.util.ArrayList;
+
+import error.Error;
+import error.ErrorType;
+import error.Errors;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.io.IOException;
+
+public class Lexer {
+    private String input;
+    private ArrayList<Token> tokens;
+    private int position;
+    private int line;
+    private char currentChar;
+
+    public Lexer(String input) {
+        this.input = input;
+        this.tokens = new ArrayList<Token>();
+        this.position = 0;
+        this.line = 1;
+    }
+
+    public void lex(Errors errors) {
+        int sigComment = 0;
+        while (this.position < this.input.length()) {
+            currentChar = this.input.charAt(this.position);
+            if (currentChar == ' ' || currentChar == '\t') {
+                this.position++;
+                continue;
+            }
+            if (currentChar == '\n' || currentChar == '\r') {
+                if (currentChar == '\r') {
+                    if (this.position + 1 < this.input.length() &&
+                            this.input.charAt(this.position + 1) == '\n') {
+                        this.position++;
+                    }
+                }
+                this.line++;
+                this.position++;
+                if (sigComment == 1) {
+                    sigComment = 0;
+                }
+                continue;
+            }
+            if (sigComment == 0) {
+                if (currentChar == '/') {
+                    if (this.position + 1 < this.input.length() &&
+                            this.input.charAt(this.position + 1) == '/') {
+                        sigComment = 1;
+                        this.position += 2;
+                        continue;
+                    }
+                    if (this.position + 1 < this.input.length() &&
+                            this.input.charAt(this.position + 1) == '*') {
+                        sigComment = 2;
+                        this.position += 2;
+                        continue;
+                    }
+                }
+                if (this.isIntCons()) {
+                    lexInt();
+                    continue;
+                }
+                if (this.isStrCons()) {
+                    lexStr();
+                    continue;
+                }
+                if (this.isIdenfr()) {
+                    lexIdenfr();
+                    continue;
+                }
+                lexOp(errors);
+            }
+            if (sigComment == 2) {
+                if (this.position + 1 < this.input.length() &&
+                        this.currentChar == '*' && this.input.charAt(this.position + 1) == '/') {
+                    sigComment = 0;
+                    this.position += 2;
+                    continue;
+                }
+            }
+            if (sigComment != 0) {
+                this.position++;
+            }
+        }
+    }
+
+    public boolean isIntCons() {
+        return Character.isDigit(this.currentChar);
+    }
+
+    public boolean isStrCons() {
+        return this.currentChar == '"';
+    }
+
+    public boolean isIdenfr() {
+        return Character.isLowerCase(this.currentChar) || Character.isUpperCase(this.currentChar)
+                || this.currentChar == '_';
+    }
+
+    public boolean isNotWp() {
+        return !Character.isWhitespace(this.currentChar);
+    }
+
+    public boolean isOp() {
+        return !this.isIntCons() && !this.isStrCons() && !this.isIdenfr();
+    }
+
+    public void lexInt() {
+        StringBuilder sb = new StringBuilder();
+        while (this.position < this.input.length() && this.isIntCons()) {
+            sb.append(this.currentChar);
+            this.position++;
+            updateCurrentChar();
+        }
+        this.tokens.add(new Token(sb.toString(), this.line));
+    }
+
+    public void lexStr() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(this.currentChar);
+        this.position++;
+        updateCurrentChar();
+        while (this.position < this.input.length() && this.currentChar != '"') {
+            sb.append(this.currentChar);
+            this.position++;
+            updateCurrentChar();
+        }
+        if (this.position < this.input.length() && this.currentChar == '"') {
+            sb.append(this.currentChar);
+            this.position++;
+        }
+        this.tokens.add(new Token(sb.toString(), this.line));
+    }
+
+    public void lexIdenfr() {
+        StringBuilder sb = new StringBuilder();
+        while (this.position < this.input.length() && (this.isIdenfr() || this.isIntCons())) {
+            sb.append(this.currentChar);
+            this.position++;
+            updateCurrentChar();
+        }
+        this.tokens.add(new Token(sb.toString(), this.line));
+    }
+
+    public void lexOp(Errors errors) {
+        StringBuilder sb = new StringBuilder();
+        if (this.currentChar == '/' && this.position + 1 < this.input.length() &&
+                (this.input.charAt(this.position + 1) == '/' ||
+                        this.input.charAt(this.position + 1) == '*')) {
+            return;
+        }
+        sb.append(this.currentChar);
+        switch (this.currentChar) {
+            case '&':
+                readAnd(sb);
+                break;
+            case '|':
+                readOr(sb);
+                break;
+            case '<':
+                readEq(sb);
+                break;
+            case '>':
+                readEq(sb);
+                break;
+            case '=':
+                readEq(sb);
+                break;
+            case '!':
+                readEq(sb);
+                break;
+            default:
+                break;
+        }
+        this.position++;
+        if (sb.toString().equals("&") || sb.toString().equals("|")) {
+            errors.addError(new Error(this.line, ErrorType.a));
+        }
+        this.tokens.add(new Token(sb.toString(), this.line));
+    }
+
+    public void readAnd(StringBuilder sb) {
+        if (this.position + 1 < this.input.length() &&
+                this.input.charAt(this.position + 1) == '&') {
+            this.position++;
+            currentChar = this.input.charAt(this.position);
+            sb.append(currentChar);
+        }
+    }
+
+    public void readOr(StringBuilder sb) {
+        if (this.position + 1 < this.input.length() &&
+                this.input.charAt(this.position + 1) == '|') {
+            this.position++;
+            currentChar = this.input.charAt(this.position);
+            sb.append(currentChar);
+        }
+    }
+
+    public void readEq(StringBuilder sb) {
+        if (this.position + 1 < this.input.length() &&
+                this.input.charAt(this.position + 1) == '=') {
+            this.position++;
+            currentChar = this.input.charAt(this.position);
+            sb.append(currentChar);
+        }
+    }
+
+    public void updateCurrentChar() {
+        if (this.position < this.input.length()) {
+            currentChar = this.input.charAt(this.position);
+        }
+    }
+
+    public void printTokens() {
+        for (Token token : this.tokens) {
+            token.adjustType();
+            System.out.println(token.getType() + " " + token.getValue() + " " + token.getLine());
+        }
+    }
+
+    public void writeToFile(String fileName) {
+        try {
+            StringBuilder sb = new StringBuilder();
+            for (Token token : this.tokens) {
+                token.adjustType();
+                sb.append(token.toString());
+            }
+            Files.write(Paths.get(fileName), sb.toString().getBytes());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public ArrayList<Token> getTokens() {
+        for (Token token : this.tokens) {
+            token.adjustType();
+        }
+        return this.tokens;
+    }
+}

frontend/lexer/Token.java

@@ -1,42 +1,42 @@
-package frontend.lexer;
-
-public class Token {
-    private TokenType type;
-    private String value;
-    private int line;
-
-    public Token(String value, int line) {
-        this.value = value;
-        this.type = TokenType.isWhatType(value);
-        this.line = line;
-    }
-    
-    public void adjustType() {
-        if (this.type == TokenType.IDENFR) {
-            if (this.value.charAt(0) == '\"' && 
-                this.value.charAt(this.value.length() - 1) == '\"') {
-                this.type = TokenType.STRCON;
-            }
-            String regex = "^\\d+$";
-            if (this.value.matches(regex)) {
-                this.type = TokenType.INTCON;
-            }
-        }
-    }
-
-    public String getValue() {
-        return this.value;
-    }
-
-    public TokenType getType() {
-        return this.type;
-    }
-
-    public int getLine() {
-        return this.line;
-    }
-
-    public String toString() {
-        return this.type + " " + this.value + "\n";
-    }
-}
+package frontend.lexer;
+
+public class Token {
+    private TokenType type;
+    private String value;
+    private int line;
+
+    public Token(String value, int line) {
+        this.value = value;
+        this.type = TokenType.isWhatType(value);
+        this.line = line;
+    }
+    
+    public void adjustType() {
+        if (this.type == TokenType.IDENFR) {
+            if (this.value.charAt(0) == '\"' && 
+                this.value.charAt(this.value.length() - 1) == '\"') {
+                this.type = TokenType.STRCON;
+            }
+            String regex = "^\\d+$";
+            if (this.value.matches(regex)) {
+                this.type = TokenType.INTCON;
+            }
+        }
+    }
+
+    public String getValue() {
+        return this.value;
+    }
+
+    public TokenType getType() {
+        return this.type;
+    }
+
+    public int getLine() {
+        return this.line;
+    }
+
+    public String toString() {
+        return this.type + " " + this.value + "\n";
+    }
+}

frontend/lexer/TokenType.java

@@ -1,123 +1,123 @@
-package frontend.lexer;
-
-public enum TokenType {
-    IDENFR,
-    INTCON,
-    STRCON,
-    CONSTTK,
-    INTTK,
-    STATICTK,
-    BREAKTK,
-    CONTINUETK,
-    IFTK,
-    MAINTK,
-    ELSETK,
-    NOT,
-    AND,
-    OR,
-    FORTK,
-    RETURNTK,
-    VOIDTK,
-    PLUS,
-    MINU,
-    PRINTFTK,
-    MULT,
-    DIV,
-    MOD,
-    LSS,
-    LEQ,
-    GRE,
-    GEQ,
-    EQL,
-    NEQ,
-    SEMICN,
-    COMMA,
-    LPARENT,
-    RPARENT,
-    LBRACK,
-    RBRACK,
-    LBRACE,
-    RBRACE,
-    ASSIGN;
-
-    public static TokenType isWhatType(String str) {
-        switch (str) {
-            case "const":
-                return TokenType.CONSTTK;
-            case "int":
-                return TokenType.INTTK;
-            case "static":
-                return TokenType.STATICTK;
-            case "break":
-                return TokenType.BREAKTK;
-            case "continue":
-                return TokenType.CONTINUETK;
-            case "if":
-                return TokenType.IFTK;
-            case "main":
-                return TokenType.MAINTK;
-            case "else":
-                return TokenType.ELSETK;
-            case "!":
-                return TokenType.NOT;
-            case "&&":
-                return TokenType.AND;
-            case "&":
-                return TokenType.AND;
-            case "||":
-                return TokenType.OR;
-            case "|":
-                return TokenType.OR;
-            case "for":
-                return TokenType.FORTK;
-            case "return":
-                return TokenType.RETURNTK;
-            case "void":
-                return TokenType.VOIDTK;
-            case "+":
-                return TokenType.PLUS;
-            case "-":
-                return TokenType.MINU;
-            case "printf":
-                return TokenType.PRINTFTK;
-            case "*":
-                return TokenType.MULT;
-            case "/":
-                return TokenType.DIV;
-            case "%":
-                return TokenType.MOD;
-            case "<":
-                return TokenType.LSS;
-            case "<=":
-                return TokenType.LEQ;
-            case ">":
-                return TokenType.GRE;
-            case ">=":
-                return TokenType.GEQ;
-            case "==":
-                return TokenType.EQL;
-            case "!=":
-                return TokenType.NEQ;
-            case ";":
-                return TokenType.SEMICN;
-            case ",":
-                return TokenType.COMMA;
-            case "(":
-                return TokenType.LPARENT;
-            case ")":
-                return TokenType.RPARENT;
-            case "[":
-                return TokenType.LBRACK;
-            case "]":
-                return TokenType.RBRACK;
-            case "{":
-                return TokenType.LBRACE;
-            case "}":
-                return TokenType.RBRACE;
-            case "=":
-                return TokenType.ASSIGN;
-            default:
-                return TokenType.IDENFR;
-        }
-    }
-}
+package frontend.lexer;
+
+public enum TokenType {
+    IDENFR,
+    INTCON,
+    STRCON,
+    CONSTTK,
+    INTTK,
+    STATICTK,
+    BREAKTK,
+    CONTINUETK,
+    IFTK,
+    MAINTK,
+    ELSETK,
+    NOT,
+    AND,
+    OR,
+    FORTK,
+    RETURNTK,
+    VOIDTK,
+    PLUS,
+    MINU,
+    PRINTFTK,
+    MULT,
+    DIV,
+    MOD,
+    LSS,
+    LEQ,
+    GRE,
+    GEQ,
+    EQL,
+    NEQ,
+    SEMICN,
+    COMMA,
+    LPARENT,
+    RPARENT,
+    LBRACK,
+    RBRACK,
+    LBRACE,
+    RBRACE,
+    ASSIGN;
+
+    public static TokenType isWhatType(String str) {
+        switch (str) {
+            case "const":
+                return TokenType.CONSTTK;
+            case "int":
+                return TokenType.INTTK;
+            case "static":
+                return TokenType.STATICTK;
+            case "break":
+                return TokenType.BREAKTK;
+            case "continue":
+                return TokenType.CONTINUETK;
+            case "if":
+                return TokenType.IFTK;
+            case "main":
+                return TokenType.MAINTK;
+            case "else":
+                return TokenType.ELSETK;
+            case "!":
+                return TokenType.NOT;
+            case "&&":
+                return TokenType.AND;
+            case "&":
+                return TokenType.AND;
+            case "||":
+                return TokenType.OR;
+            case "|":
+                return TokenType.OR;
+            case "for":
+                return TokenType.FORTK;
+            case "return":
+                return TokenType.RETURNTK;
+            case "void":
+                return TokenType.VOIDTK;
+            case "+":
+                return TokenType.PLUS;
+            case "-":
+                return TokenType.MINU;
+            case "printf":
+                return TokenType.PRINTFTK;
+            case "*":
+                return TokenType.MULT;
+            case "/":
+                return TokenType.DIV;
+            case "%":
+                return TokenType.MOD;
+            case "<":
+                return TokenType.LSS;
+            case "<=":
+                return TokenType.LEQ;
+            case ">":
+                return TokenType.GRE;
+            case ">=":
+                return TokenType.GEQ;
+            case "==":
+                return TokenType.EQL;
+            case "!=":
+                return TokenType.NEQ;
+            case ";":
+                return TokenType.SEMICN;
+            case ",":
+                return TokenType.COMMA;
+            case "(":
+                return TokenType.LPARENT;
+            case ")":
+                return TokenType.RPARENT;
+            case "[":
+                return TokenType.LBRACK;
+            case "]":
+                return TokenType.RBRACK;
+            case "{":
+                return TokenType.LBRACE;
+            case "}":
+                return TokenType.RBRACE;
+            case "=":
+                return TokenType.ASSIGN;
+            default:
+                return TokenType.IDENFR;
+        }
+    }
+}

frontend/parser/Parser.java

@@ -1,38 +1,38 @@
-package frontend.parser;
-
-import frontend.ast.CompUnit;
-import frontend.lexer.TokenStream;
-
-import java.nio.file.Files;
-
-import error.Errors;
-
-import java.nio.file.Paths;
-import java.io.IOException;
-
-public class Parser {
-    private TokenStream ts;
-    private CompUnit compUnit;
-
-    public Parser(TokenStream ts) {
-        this.ts = ts;
-        this.compUnit = new CompUnit(this.ts);
-    }
-
-    public void parse(Errors errors) {
-        compUnit.parse(errors);
-    }
-
-    public CompUnit getCompUnit() {
-        return compUnit;
-    }
-
-    public void writeToFile(String fileName) {
-        try {
-            String info = this.compUnit.getInfo();
-            Files.write(Paths.get(fileName), info.getBytes());
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-}
+package frontend.parser;
+
+import frontend.ast.CompUnit;
+import frontend.lexer.TokenStream;
+
+import java.nio.file.Files;
+
+import error.Errors;
+
+import java.nio.file.Paths;
+import java.io.IOException;
+
+public class Parser {
+    private TokenStream ts;
+    private CompUnit compUnit;
+
+    public Parser(TokenStream ts) {
+        this.ts = ts;
+        this.compUnit = new CompUnit(this.ts);
+    }
+
+    public void parse(Errors errors) {
+        compUnit.parse(errors);
+    }
+
+    public CompUnit getCompUnit() {
+        return compUnit;
+    }
+
+    public void writeToFile(String fileName) {
+        try {
+            String info = this.compUnit.getInfo();
+            Files.write(Paths.get(fileName), info.getBytes());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

midend/Midend.java

@@ -1,31 +1,36 @@
-package midend;
-
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import frontend.ast.CompUnit;
-import midend.llvm.IrBuilder;
-import midend.llvm.IrModule;
-import midend.visit.Visitor;
-
-public class Midend {
-    private IrModule module;
-    private Visitor visitor;
-
-    public Midend(CompUnit compUnit) {
-        this.module = new IrModule();
-        this.visitor = new Visitor(compUnit);
-    }
-
-    public void generateLLvmIr() {
-        IrBuilder.setCurrentModule(module);
-        visitor.visit();
-    }
-
-    public void writeToFile(String fileName) {
-        try {
-            Files.write(Paths.get(fileName), module.toString().getBytes());
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-}
+package midend;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import frontend.ast.CompUnit;
+import midend.llvm.IrBuilder;
+import midend.llvm.IrModule;
+import midend.visit.Visitor;
+
+public class Midend {
+    private IrModule module;
+    private Visitor visitor;
+
+    public Midend(CompUnit compUnit) {
+        this.module = new IrModule();
+        this.visitor = new Visitor(compUnit);
+    }
+
+    public void generateLLvmIr() {
+        IrBuilder.setCurrentModule(module);
+        visitor.visit();
+    }
+
+    public IrModule getModule() {
+        return module;
+    }
+
+    public void writeToFile(String fileName) {
+        try {
+            Files.write(Paths.get(fileName), module.toString().getBytes());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
+//

midend/errorhandle/ErrorHandler.java

@@ -1,32 +1,32 @@
-package midend.errorhandle;
-
-import frontend.ast.CompUnit;
-
-import midend.symbol.SymbolManager;
-
-import error.Errors;
-
-import java.nio.file.Files;
-import java.nio.file.Paths;
-
-public class ErrorHandler {
-    private CompUnit compUnit;
-
-    public ErrorHandler(CompUnit compUnit) {
-        this.compUnit = compUnit;
-        SymbolManager.init();
-    }
-
-    public void visit(Errors errors) {
-        compUnit.fillSymbolTable(false, false, errors);
-    }
-
-    public void writeToFile(String fileName) {
-        try {
-            String info = SymbolManager.getSymbolTableInfo();
-            Files.write(Paths.get(fileName), info.getBytes());
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-}
+package midend.errorhandle;
+
+import frontend.ast.CompUnit;
+
+import midend.symbol.SymbolManager;
+
+import error.Errors;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public class ErrorHandler {
+    private CompUnit compUnit;
+
+    public ErrorHandler(CompUnit compUnit) {
+        this.compUnit = compUnit;
+        SymbolManager.init();
+    }
+
+    public void visit(Errors errors) {
+        compUnit.fillSymbolTable(false, false, errors);
+    }
+
+    public void writeToFile(String fileName) {
+        try {
+            String info = SymbolManager.getSymbolTableInfo();
+            Files.write(Paths.get(fileName), info.getBytes());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

midend/llvm/IrBuilder.java

@@ -1,143 +1,143 @@
-package midend.llvm;
-
-import java.util.HashMap;
-import java.util.Stack;
-
-import midend.llvm.value.IrFuncValue;
-import midend.llvm.value.IrBasicBlock;
-import midend.llvm.value.IrLoop;
-import midend.llvm.type.IrType;
-import midend.llvm.constant.IrConstant;
-import midend.llvm.value.IrGlobalValue;
-import midend.llvm.constant.IrConstantStr;
-import midend.llvm.instr.IrInstr;
-
-public class IrBuilder {
-    private static final String prebb = "b_";
-    private static final String prestr = "@s_";
-    private static final String prefunc = "@f_";
-    private static final String preglobal = "@g_";
-    private static final String prelocal = "%v_";
-
-    private static IrModule module = null;
-    private static IrFuncValue currentFunc = null;
-    private static IrBasicBlock currentBB = null;
-    private static int strId = 0;
-    private static int globalId = 0;
-    private static int bblockId = 0;
-    private static HashMap<IrFuncValue, Integer> funcIdMap = new HashMap<>(); // func, localId
-    private static Stack<IrLoop> loopStack = new Stack<>();
-    
-    public static void setCurrentModule(IrModule module) {
-        IrBuilder.module = module;
-    }
-
-    public static void addNewFunc(String name, IrType retType) {
-        IrFuncValue func = new IrFuncValue(geFuncName(name), retType);
-        module.addFunc(func);
-        funcIdMap.put(func, 0);
-        currentFunc = func;
-        IrBasicBlock entryBB = new IrBasicBlock(getBlockName(), func);
-        func.addBBlock(entryBB);
-        currentBB = entryBB;
-    }
-
-    public static void addNewFunc(IrFuncValue func) {
-        module.addFunc(func);
-        funcIdMap.put(func, 0);
-        currentFunc = func;
-        IrBasicBlock entryBB = new IrBasicBlock(getBlockName(), func);
-        func.addBBlock(entryBB);
-        currentBB = entryBB;
-    }
-
-    public static void addNewBB() {
-        IrBasicBlock bb = new IrBasicBlock(getBlockName(), currentFunc);
-        currentFunc.addBBlock(bb);
-    }
-
-    public static void addNewBB(IrBasicBlock bb) {
-        currentFunc.addBBlock(bb);
-    }
-
-    public static void setCurrentBBlock(IrBasicBlock bb) {
-        currentBB = bb;
-    }
-
-    public static void addNewGlobal(IrType type, boolean isConstant, IrConstant initVal) {
-        IrGlobalValue global = new IrGlobalValue(type, getGlobalName(), isConstant, initVal);
-        module.addGlobalVar(global);
-    }
-
-    public static void addNewGlobal(IrGlobalValue global) {
-        module.addGlobalVar(global);
-    }
-
-    public static void addNewStr(String str) {
-        if (module.containStr(str)) {
-            return;
-        }
-        module.addStr(new IrConstantStr(str, getStrName()));
-    }
-
-    public static void addNewStr(IrConstantStr str) {
-        module.addStr(str);
-    }
-
-    public static void addInstr(IrInstr instr) {
-        currentBB.addInstr(instr);
-        instr.setBBlock(currentBB);
-    }
-
-    public static String geFuncName(String name) {
-        return name.equals("main") ? "@main" : prefunc + name;
-    }
-
-    public static String getBlockName() {
-        return prebb + bblockId++;
-    }
-
-    public static String getStrName() {
-        return prestr + strId++;
-    }
-
-    public static String getGlobalName() {
-        return preglobal + globalId++;
-    }
-
-    public static String getLocalName() {
-        int id = funcIdMap.get(currentFunc);
-        funcIdMap.put(currentFunc, id + 1);
-        return prelocal + id;
-    }
-
-    public static String getLocalName(IrFuncValue func) {
-        int id = funcIdMap.get(func);
-        funcIdMap.put(func, id + 1);
-        return prelocal + id;
-    }
-
-    public static IrModule getCurrentModule() {
-        return module;
-    }
-
-    public static IrFuncValue getCurrentFunc() {
-        return currentFunc;
-    }
-
-    public static IrBasicBlock getCurrentBB() {
-        return currentBB;
-    }
-
-    public static void pushLoop(IrLoop loop) {
-        loopStack.push(loop);
-    }
-
-    public static IrLoop popLoop() {
-        return loopStack.pop();
-    }
-
-    public static IrLoop getCurrentLoop() {
-        return loopStack.peek();
-    }
-}
+package midend.llvm;
+
+import java.util.HashMap;
+import java.util.Stack;
+
+import midend.llvm.value.IrFuncValue;
+import midend.llvm.value.IrBasicBlock;
+import midend.llvm.value.IrLoop;
+import midend.llvm.type.IrType;
+import midend.llvm.constant.IrConstant;
+import midend.llvm.value.IrGlobalValue;
+import midend.llvm.constant.IrConstantStr;
+import midend.llvm.instr.IrInstr;
+
+public class IrBuilder {
+    private static final String prebb = "b_";
+    private static final String prestr = "@s_";
+    private static final String prefunc = "@f_";
+    private static final String preglobal = "@g_";
+    private static final String prelocal = "%v_";
+
+    private static IrModule module = null;
+    private static IrFuncValue currentFunc = null;
+    private static IrBasicBlock currentBB = null;
+    private static int strId = 0;
+    private static int globalId = 0;
+    private static int bblockId = 0;
+    private static HashMap<IrFuncValue, Integer> funcIdMap = new HashMap<>(); // func, localId
+    private static Stack<IrLoop> loopStack = new Stack<>();
+    
+    public static void setCurrentModule(IrModule module) {
+        IrBuilder.module = module;
+    }
+
+    public static void addNewFunc(String name, IrType retType) {
+        IrFuncValue func = new IrFuncValue(geFuncName(name), retType);
+        module.addFunc(func);
+        funcIdMap.put(func, 0);
+        currentFunc = func;
+        IrBasicBlock entryBB = new IrBasicBlock(getBlockName(), func);
+        func.addBBlock(entryBB);
+        currentBB = entryBB;
+    }
+
+    public static void addNewFunc(IrFuncValue func) {
+        module.addFunc(func);
+        funcIdMap.put(func, 0);
+        currentFunc = func;
+        IrBasicBlock entryBB = new IrBasicBlock(getBlockName(), func);
+        func.addBBlock(entryBB);
+        currentBB = entryBB;
+    }
+
+    public static void addNewBB() {
+        IrBasicBlock bb = new IrBasicBlock(getBlockName(), currentFunc);
+        currentFunc.addBBlock(bb);
+    }
+
+    public static void addNewBB(IrBasicBlock bb) {
+        currentFunc.addBBlock(bb);
+    }
+
+    public static void setCurrentBBlock(IrBasicBlock bb) {
+        currentBB = bb;
+    }
+
+    public static void addNewGlobal(IrType type, boolean isConstant, IrConstant initVal) {
+        IrGlobalValue global = new IrGlobalValue(type, getGlobalName(), isConstant, initVal);
+        module.addGlobalVar(global);
+    }
+
+    public static void addNewGlobal(IrGlobalValue global) {
+        module.addGlobalVar(global);
+    }
+
+    public static void addNewStr(String str) {
+        if (module.containStr(str)) {
+            return;
+        }
+        module.addStr(new IrConstantStr(str, getStrName()));
+    }
+
+    public static void addNewStr(IrConstantStr str) {
+        module.addStr(str);
+    }
+
+    public static void addInstr(IrInstr instr) {
+        currentBB.addInstr(instr);
+        instr.setBBlock(currentBB);
+    }
+
+    public static String geFuncName(String name) {
+        return name.equals("main") ? "@main" : prefunc + name;
+    }
+
+    public static String getBlockName() {
+        return prebb + bblockId++;
+    }
+
+    public static String getStrName() {
+        return prestr + strId++;
+    }
+
+    public static String getGlobalName() {
+        return preglobal + globalId++;
+    }
+
+    public static String getLocalName() {
+        int id = funcIdMap.get(currentFunc);
+        funcIdMap.put(currentFunc, id + 1);
+        return prelocal + id;
+    }
+
+    public static String getLocalName(IrFuncValue func) {
+        int id = funcIdMap.get(func);
+        funcIdMap.put(func, id + 1);
+        return prelocal + id;
+    }
+
+    public static IrModule getCurrentModule() {
+        return module;
+    }
+
+    public static IrFuncValue getCurrentFunc() {
+        return currentFunc;
+    }
+
+    public static IrBasicBlock getCurrentBB() {
+        return currentBB;
+    }
+
+    public static void pushLoop(IrLoop loop) {
+        loopStack.push(loop);
+    }
+
+    public static IrLoop popLoop() {
+        return loopStack.pop();
+    }
+
+    public static IrLoop getCurrentLoop() {
+        return loopStack.peek();
+    }
+}

midend/llvm/IrModule.java

@@ -1,100 +1,125 @@
-package midend.llvm;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-
-import midend.llvm.constant.IrConstantStr;
-import midend.llvm.value.IrFuncValue;
-import midend.llvm.value.IrGlobalValue;
-import midend.llvm.instr.GetIntInstr;
-import midend.llvm.instr.PutChInstr;
-import midend.llvm.instr.PutIntInstr;
-import midend.llvm.instr.PutStrInstr;
-
-public class IrModule {
-    private ArrayList<String> decls;
-    private HashMap<String, IrConstantStr> strs;
-    private ArrayList<IrGlobalValue> globalVars;
-    private ArrayList<IrFuncValue> funcs;
-
-    public IrModule() {
-        decls = new ArrayList<>();
-        strs = new HashMap<>();
-        globalVars = new ArrayList<>();
-        funcs = new ArrayList<>();
-        decls.add(GetIntInstr.getIntDecl());
-        decls.add(PutChInstr.putChDecl());
-        decls.add(PutIntInstr.putIntDecl());
-        decls.add(PutStrInstr.putStrDecl());
-    }
-
-    public ArrayList<String> getDecls() {
-        return decls;
-    }
-
-    public HashMap<String, IrConstantStr> getStrs() {
-        return strs;
-    }
-
-    public ArrayList<IrGlobalValue> getGlobalVars() {
-        return globalVars;
-    }
-
-    public ArrayList<IrFuncValue> getFuncs() {
-        return funcs;
-    }
-
-    public void addFunc(IrFuncValue func) {
-        funcs.add(func);
-    }
-
-    public void addStr(IrConstantStr str) {
-        if (strs.containsKey(str.getValue())) {
-            return;
-        }
-        strs.put(str.getValue(), str);
-    }
-
-    public boolean containStr(String str) {
-        return strs.containsKey(str);
-    }
-
-    public IrConstantStr getStr(String str) {
-        if (containStr(str)) {
-            return strs.get(str);
-        }
-        return null;
-    }
-
-    public void addGlobalVar(IrGlobalValue globalVar) {
-        globalVars.add(globalVar);
-    }
-
-    public IrFuncValue getMainFunc() {
-        for (IrFuncValue func : funcs) {
-            if (func.isMain()) {
-                return func;
-            }
-        }
-        return null;
-    }
-
-    //TODO: toString()方法编写
-    public String toString() {
-        StringBuilder sb = new StringBuilder();
-        for (String decl : decls) {
-            sb.append(decl).append("\n");
-        }
-        for (IrConstantStr str : strs.values()) {
-            sb.append(str.toString()).append("\n");
-        }
-        for (IrGlobalValue globalVar : globalVars) {
-            sb.append(globalVar.toString()).append("\n");
-        }
-        for (IrFuncValue func : funcs) {
-            sb.append(func.toString()).append("\n");
-        }
-        // System.out.println(funcs.size());
-        return sb.toString();
-    }
-}
+package midend.llvm;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import backend.mips.Register;
+import backend.mips.instr.MipsAnnotation;
+import backend.mips.instr.MipsJump;
+import backend.mips.instr.MipsLabel;
+import backend.mips.instr.fake.MipsLi;
+import backend.mips.instr.MipsSyscall;
+import backend.mips.instr.type.MipsJumpType;
+import midend.llvm.constant.IrConstantStr;
+import midend.llvm.value.IrFuncValue;
+import midend.llvm.value.IrGlobalValue;
+import midend.llvm.instr.GetIntInstr;
+import midend.llvm.instr.PutChInstr;
+import midend.llvm.instr.PutIntInstr;
+import midend.llvm.instr.PutStrInstr;
+
+public class IrModule {
+    private ArrayList<String> decls;
+    private HashMap<String, IrConstantStr> strs;
+    private ArrayList<IrGlobalValue> globalVars;
+    private ArrayList<IrFuncValue> funcs;
+
+    public IrModule() {
+        decls = new ArrayList<>();
+        strs = new HashMap<>();
+        globalVars = new ArrayList<>();
+        funcs = new ArrayList<>();
+        decls.add(GetIntInstr.getIntDecl());
+        decls.add(PutChInstr.putChDecl());
+        decls.add(PutIntInstr.putIntDecl());
+        decls.add(PutStrInstr.putStrDecl());
+    }
+
+    public ArrayList<String> getDecls() {
+        return decls;
+    }
+
+    public HashMap<String, IrConstantStr> getStrs() {
+        return strs;
+    }
+
+    public ArrayList<IrGlobalValue> getGlobalVars() {
+        return globalVars;
+    }
+
+    public ArrayList<IrFuncValue> getFuncs() {
+        return funcs;
+    }
+
+    public void addFunc(IrFuncValue func) {
+        funcs.add(func);
+    }
+
+    public void addStr(IrConstantStr str) {
+        if (strs.containsKey(str.getValue())) {
+            return;
+        }
+        strs.put(str.getValue(), str);
+    }
+
+    public boolean containStr(String str) {
+        return strs.containsKey(str);
+    }
+
+    public IrConstantStr getStr(String str) {
+        if (containStr(str)) {
+            return strs.get(str);
+        }
+        return null;
+    }
+
+    public void addGlobalVar(IrGlobalValue globalVar) {
+        globalVars.add(globalVar);
+    }
+
+    public IrFuncValue getMainFunc() {
+        for (IrFuncValue func : funcs) {
+            if (func.isMain()) {
+                return func;
+            }
+        }
+        return null;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (String decl : decls) {
+            sb.append(decl).append("\n");
+        }
+        for (IrConstantStr str : strs.values()) {
+            sb.append(str.toString()).append("\n");
+        }
+        for (IrGlobalValue globalVar : globalVars) {
+            sb.append(globalVar.toString()).append("\n");
+        }
+        for (IrFuncValue func : funcs) {
+            sb.append(func.toString()).append("\n");
+        }
+        // System.out.println(funcs.size());
+        return sb.toString();
+    }
+
+    public void toMips() {
+        for (IrGlobalValue globalVar : this.globalVars) {
+            globalVar.toMips();
+        }
+        for (IrConstantStr str : this.strs.values()) {
+            str.toMips(str.getMipsLabel());
+        }
+        new MipsAnnotation("jump to main");
+        new MipsJump(MipsJumpType.JAL, "main");
+        new MipsJump(MipsJumpType.J, "end");
+
+        for (IrFuncValue irFunction : this.funcs) {
+            irFunction.toMips();
+        }
+        new MipsLabel("end");
+        new MipsLi(Register.V0, 10);
+        new MipsSyscall();
+    }
+}

midend/llvm/constant/IrConstant.java

@@ -11,4 +11,8 @@ public class IrConstant extends IrValue {
     public String toString() {
         return "";
     }
+
+    public void toMips(String label) {
+
+    }
 }

midend/llvm/constant/IrConstantArray.java

@@ -2,6 +2,8 @@ package midend.llvm.constant;
 
 import java.util.ArrayList;
 
+import backend.mips.instr.data.MipsSpace;
+import backend.mips.instr.data.MipsWord;
 import midend.llvm.type.IrInterType;
 import midend.llvm.type.IrArrayType;
 
@@ -44,4 +46,19 @@ public class IrConstantArray extends IrConstant {
         }
         return sb.toString();
     }
+
+    public void toMips(String label) {
+        ArrayList<Integer> values = new ArrayList<>();
+        if (elements.size() == 0) {
+            new MipsSpace(size * 4, label);
+        } else {
+            for (IrConstant element : elements) {
+                values.add(((IrConstantInt) element).getValue());
+            }
+            for (int i = 0; i < size - elements.size(); i++) {
+                values.add(0);
+            }
+            new MipsWord(label, values);
+        }
+    }
 }

midend/llvm/constant/IrConstantInt.java

@@ -1,5 +1,6 @@
 package midend.llvm.constant;
 
+import backend.mips.instr.data.MipsWord;
 import midend.llvm.type.IrInterType;
 
 public class IrConstantInt extends IrConstant {
@@ -17,4 +18,8 @@ public class IrConstantInt extends IrConstant {
     public String toString() {
         return "i32 " + value;
     }
+        
+    public void toMips(String label) {
+        new MipsWord(label, value);
+    }
 }

midend/llvm/constant/IrConstantStr.java

@@ -1,53 +1,58 @@
-package midend.llvm.constant;
-
-import midend.llvm.type.IrArrayType;
-import midend.llvm.type.IrPointerType;
-import midend.llvm.type.IrInterType;
-
-public class IrConstantStr extends IrConstant {
-    private String value;
-
-    public IrConstantStr(String value, String name) {
-        super(new IrPointerType(
-                new IrArrayType(IrInterType.INT8, getLen(value) + 1)), name);
-        this.value = value;
-    }
-
-    public String getValue() {
-        return value;
-    }
-
-    public static int getLen(String value) {
-        int len = 0;
-        for (int i = 0; i < value.length(); i++) {
-            if (value.charAt(i) == '\\') {
-                i++;
-            } else if (value.charAt(i) == '"') {
-                continue;
-            }
-            len++;
-        }
-        return len;
-    }
-
-    public static String getRealStr(String str) {
-        boolean start = str.charAt(0) == '"';
-        boolean end = str.charAt(str.length() - 1) == '"';
-        if (start && end) {
-            return str.substring(1, str.length() - 1);
-        } else if (start) {
-            return str.substring(1);
-        } else if (end) {
-            return str.substring(0, str.length() - 1);
-        }
-        return str;
-    }
-
-    public String toString() {
-        StringBuilder sb = new StringBuilder();
-        sb.append(getName() + " = constant " + ((IrPointerType) getType()).getPointeeType());
-        sb.append(" c\"" + getRealStr(value).replace("\\n", "\\0A"));
-        sb.append("\\00\"");
-        return sb.toString();
-    }
-}
+package midend.llvm.constant;
+
+import backend.mips.instr.data.MipsAsciiz;
+import midend.llvm.type.IrArrayType;
+import midend.llvm.type.IrPointerType;
+import midend.llvm.type.IrInterType;
+
+public class IrConstantStr extends IrConstant {
+    private String value;
+
+    public IrConstantStr(String value, String name) {
+        super(new IrPointerType(
+                new IrArrayType(IrInterType.INT8, getLen(value) + 1)), name);
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public static int getLen(String value) {
+        int len = 0;
+        for (int i = 0; i < value.length(); i++) {
+            if (value.charAt(i) == '\\') {
+                i++;
+            } else if (value.charAt(i) == '"') {
+                continue;
+            }
+            len++;
+        }
+        return len;
+    }
+
+    public static String getRealStr(String str) {
+        boolean start = str.charAt(0) == '"';
+        boolean end = str.charAt(str.length() - 1) == '"';
+        if (start && end) {
+            return str.substring(1, str.length() - 1);
+        } else if (start) {
+            return str.substring(1);
+        } else if (end) {
+            return str.substring(0, str.length() - 1);
+        }
+        return str;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getName() + " = constant " + ((IrPointerType) getType()).getPointeeType());
+        sb.append(" c\"" + getRealStr(value).replace("\\n", "\\0A"));
+        sb.append("\\00\"");
+        return sb.toString();
+    }
+
+    public void toMips(String label) {
+        new MipsAsciiz(label, getRealStr(value));
+    }
+}

midend/llvm/instr/AllocateInstr.java

@@ -1,21 +1,49 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrPointerType;
-import midend.llvm.type.IrType;
-
-public class AllocateInstr extends IrInstr {
-    private IrType pointeeType;
-
-    public AllocateInstr(IrType pointeeType, String name) { // name即为局部变量的name，因为要声明一个局部变量
-        super(new IrPointerType(pointeeType), name, IrInstrType.ALLOCA);
-        this.pointeeType = pointeeType;
-    }
-
-    public IrType getPointeeType() {
-        return pointeeType;
-    }
-
-    public String toString() {
-        return getName() + " = alloca " + this.pointeeType;
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.MipsBuilder;
+import midend.llvm.type.IrArrayType;
+import midend.llvm.type.IrPointerType;
+import midend.llvm.type.IrType;
+import backend.mips.Register;
+import backend.mips.instr.MipsAlu;
+import backend.mips.instr.MipsLs;
+import backend.mips.instr.type.MipsAluType;
+import backend.mips.instr.type.MipsLsType;
+
+public class AllocateInstr extends IrInstr {
+    private IrType pointeeType;
+
+    public AllocateInstr(IrType pointeeType, String name) { // name即为局部变量的name，因为要声明一个局部变量
+        super(new IrPointerType(pointeeType), name, IrInstrType.ALLOCA);
+        this.pointeeType = pointeeType;
+    }
+
+    public IrType getPointeeType() {
+        return pointeeType;
+    }
+
+    public String toString() {
+        return getName() + " = alloca " + this.pointeeType;
+    }
+
+    public void toMips() {
+        // 想法：在栈上分配数据所需要的空间，再分配四字节的指针，这就是个指针，将其当作指针就好理解了
+        if (pointeeType instanceof IrArrayType) {
+            MipsBuilder.allocaOffset(4 * ((IrArrayType) pointeeType).getSize());
+        } else {
+            MipsBuilder.allocaOffset(4);
+        }
+
+        Register reg = MipsBuilder.getRegister(this);
+        if (reg == null) { // 未分配寄存器情况
+            int offset = MipsBuilder.getOffset();
+            new MipsAlu(MipsAluType.ADDI, Register.K0, Register.SP, offset);
+            MipsBuilder.allocaOffset(this);  // 将该变量的偏移量设置为其指针的偏移量，后续取值先取指针，再根据指针取值
+            offset = MipsBuilder.getOffset();
+            new MipsLs(MipsLsType.SW, Register.K0, Register.SP, offset);
+        } else {
+            int offset = MipsBuilder.getOffset();
+            new MipsAlu(MipsAluType.ADDI, reg, Register.SP, offset);
+        }
+    }
+}

midend/llvm/instr/AluInstr.java

@@ -1,24 +1,61 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrInterType;
-import midend.llvm.value.IrValue;
-
-public class AluInstr extends IrInstr {
-    private AluType alutype;
-
-    public AluInstr(String name, String op, IrValue left, IrValue right) {
-        super(IrInterType.INT32, name, IrInstrType.ALU);
-        this.alutype = AluType.getAluType(op);
-        addUse(left);
-        addUse(right);
-    }
-
-    public AluType getAluType() {
-        return alutype;
-    }
-
-    public String toString() {
-        return getName() + " = " + alutype.toString() + " " + getType() 
-            + " " + getUse(0).getName() + ", " + getUse(1).getName();
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.MipsBuilder;
+import backend.mips.instr.MipsAlu;
+import backend.mips.instr.MipsMd;
+import backend.mips.instr.type.MipsAluType;
+import backend.mips.instr.type.MipsMdType;
+import backend.mips.Register;
+
+import midend.llvm.type.IrInterType;
+import midend.llvm.value.IrValue;
+
+public class AluInstr extends IrInstr {
+    private AluType alutype;
+
+    public AluInstr(String name, String op, IrValue left, IrValue right) {
+        super(IrInterType.INT32, name, IrInstrType.ALU);
+        this.alutype = AluType.getAluType(op);
+        addUse(left);
+        addUse(right);
+    }
+
+    public AluType getAluType() {
+        return alutype;
+    }
+
+    public String toString() {
+        return getName() + " = " + alutype.toString() + " " + getType() 
+            + " " + getUse(0).getName() + ", " + getUse(1).getName();
+    }
+
+    public void toMips() {
+        IrValue left = getUse(0);
+        IrValue right = getUse(1);
+        Register leftReg = MipsBuilder.getRegister(left) != null ? MipsBuilder.getRegister(left) : Register.K0;
+        Register rightReg = MipsBuilder.getRegister(right) != null ? MipsBuilder.getRegister(right) : Register.K1;
+        Register resultReg = MipsBuilder.getRegister(this) != null ? MipsBuilder.getRegister(this) : Register.K1;
+        loadValueToReg(left, leftReg);
+        loadValueToReg(right, rightReg);
+
+        if (getAluType() == AluType.ADD) {
+            new MipsAlu(MipsAluType.ADDU, resultReg, leftReg, rightReg);
+        } else if (getAluType() == AluType.SUB) {
+            new MipsAlu(MipsAluType.SUBU, resultReg, leftReg, rightReg);
+        } else if (getAluType() == AluType.AND) {
+            new MipsAlu(MipsAluType.AND, resultReg, leftReg, rightReg);
+        } else if (getAluType() == AluType.OR) {
+            new MipsAlu(MipsAluType.OR, resultReg, leftReg, rightReg);
+        } else if (getAluType() == AluType.MUL) {
+            new MipsMd(MipsMdType.MULT, leftReg, rightReg);
+            new MipsMd(MipsMdType.MFLO, resultReg);
+        } else if (getAluType() == AluType.SDIV) {
+            new MipsMd(MipsMdType.DIV, leftReg, rightReg);
+            new MipsMd(MipsMdType.MFLO, resultReg);
+        } else if (getAluType() == AluType.SREM) {
+            new MipsMd(MipsMdType.DIV, leftReg, rightReg);
+            new MipsMd(MipsMdType.MFHI, resultReg);
+        }
+        saveResult(this, resultReg);
+    }
+}

midend/llvm/instr/AluType.java

@@ -1,53 +1,53 @@
-package midend.llvm.instr;
-
-public enum AluType {
-    ADD,
-    SUB,
-    MUL,
-    SDIV,
-    SREM,
-    AND,
-    OR;
-
-    public static AluType getAluType(String op) {
-        switch (op) {
-            case "+":
-                return ADD;
-            case "-":
-                return SUB;
-            case "*":
-                return MUL;
-            case "/":
-                return SDIV;
-            case "%":
-                return SREM;
-            case "&":
-                return AND;
-            case "|":
-                return OR;
-            default:
-                return null;
-        }
-    }
-
-    public String toString() {
-        switch (this) {
-            case ADD:
-                return "add";
-            case SUB:
-                return "sub";
-            case MUL:
-                return "mul";
-            case SDIV:
-                return "sdiv";
-            case SREM:
-                return "srem";
-            case AND:
-                return "and";
-            case OR:
-                return "or";
-            default:
-                return null;
-        }
-    }
+package midend.llvm.instr;
+
+public enum AluType {
+    ADD,
+    SUB,
+    MUL,
+    SDIV,
+    SREM,
+    AND,
+    OR;
+
+    public static AluType getAluType(String op) {
+        switch (op) {
+            case "+":
+                return ADD;
+            case "-":
+                return SUB;
+            case "*":
+                return MUL;
+            case "/":
+                return SDIV;
+            case "%":
+                return SREM;
+            case "&":
+                return AND;
+            case "|":
+                return OR;
+            default:
+                return null;
+        }
+    }
+
+    public String toString() {
+        switch (this) {
+            case ADD:
+                return "add";
+            case SUB:
+                return "sub";
+            case MUL:
+                return "mul";
+            case SDIV:
+                return "sdiv";
+            case SREM:
+                return "srem";
+            case AND:
+                return "and";
+            case OR:
+                return "or";
+            default:
+                return null;
+        }
+    }
 }

midend/llvm/instr/BranchInstr.java

@@ -1,33 +1,48 @@
-package midend.llvm.instr;
-
-import midend.llvm.value.IrBasicBlock;
-import midend.llvm.value.IrValue;
-import midend.llvm.type.IrInterType;
-
-public class BranchInstr extends IrInstr {
-    public BranchInstr(String name, IrValue cond, IrBasicBlock trueBB, IrBasicBlock falseBB) {
-        super(IrInterType.VOID, name, IrInstrType.BR);
-        addUse(cond);
-        addUse(trueBB);
-        addUse(falseBB);
-    }
-
-    public IrValue getCond() {
-        return getUse(0);
-    }
-
-    public IrBasicBlock getTrueBB() {
-        return (IrBasicBlock) getUse(1);
-    }
-
-    public IrBasicBlock getFalseBB() {
-        return (IrBasicBlock) getUse(2);
-    }
-
-    public String toString() {
-        return "br i1 " + getCond().getName() +
-                ", label %" + getTrueBB().getName() + 
-                ", label %" + getFalseBB().getName();
-    }
-
-}
+package midend.llvm.instr;
+
+import midend.llvm.value.IrBasicBlock;
+import midend.llvm.value.IrValue;
+import backend.mips.MipsBuilder;
+import backend.mips.Register;
+import backend.mips.instr.MipsBranch;
+import backend.mips.instr.type.MipsBranchType;
+import backend.mips.instr.type.MipsJumpType;
+import backend.mips.instr.MipsJump;
+import midend.llvm.type.IrInterType;
+
+public class BranchInstr extends IrInstr {
+    public BranchInstr(String name, IrValue cond, IrBasicBlock trueBB, IrBasicBlock falseBB) {
+        super(IrInterType.VOID, name, IrInstrType.BR);
+        addUse(cond);
+        addUse(trueBB);
+        addUse(falseBB);
+    }
+
+    public IrValue getCond() {
+        return getUse(0);
+    }
+
+    public IrBasicBlock getTrueBB() {
+        return (IrBasicBlock) getUse(1);
+    }
+
+    public IrBasicBlock getFalseBB() {
+        return (IrBasicBlock) getUse(2);
+    }
+
+    public String toString() {
+        return "br i1 " + getCond().getName() +
+                ", label %" + getTrueBB().getName() + 
+                ", label %" + getFalseBB().getName();
+    }
+
+    public void toMips() {
+        Register condReg = MipsBuilder.getRegister(getCond());
+        if (condReg == null) {
+            condReg = Register.K0;
+        }
+        loadValueToReg(getCond(), condReg);
+        new MipsBranch(MipsBranchType.BNE, condReg, Register.ZERO, getTrueBB().getMipsLabel());
+        new MipsJump(MipsJumpType.J, getFalseBB().getMipsLabel());
+    }
+}

midend/llvm/instr/CallInstr.java

@@ -1,48 +1,117 @@
-package midend.llvm.instr;
-
-import java.util.ArrayList;
-
-import midend.llvm.value.IrFuncValue;
-import midend.llvm.value.IrValue;
-
-public class CallInstr extends IrInstr {
-    public CallInstr(String name, IrFuncValue func, ArrayList<IrValue> args) {
-        super(func.getRetType(), name, IrInstrType.CALL);
-        addUse(func);
-        for (IrValue arg : args) {
-            addUse(arg);
-        }
-    }
-
-    public boolean callVoid() {
-        return getType().isVoid();
-    }
-
-    public IrFuncValue getCalledFunc() {
-        return (IrFuncValue) getUse(0);
-    }
-
-    public ArrayList<IrValue> getArgs() {
-        ArrayList<IrValue> args = new ArrayList<>();
-        for (int i = 1; i < getNumUses(); i++) {
-            args.add(getUse(i));
-        }
-        return args;
-    }
-
-    public String toString() {
-        StringBuilder sb = new StringBuilder();
-        if (!callVoid()) {
-            sb.append(getName() + " = ");
-        }
-        sb.append("call " + getType() + " " + getCalledFunc().getName() + "(");
-        for (int i = 1; i < getNumUses(); i++) {
-            sb.append(getUse(i).getType() + " " + getUse(i).getName());
-            if (i < getNumUses() - 1) {
-                sb.append(", ");
-            }
-        }
-        sb.append(")");
-        return sb.toString();
-    }
-}
+package midend.llvm.instr;
+
+import java.util.ArrayList;
+
+import backend.mips.Register;
+import backend.mips.instr.MipsAlu;
+import backend.mips.instr.MipsJump;
+import backend.mips.instr.MipsLs;
+import backend.mips.instr.type.MipsAluType;
+import backend.mips.instr.type.MipsJumpType;
+import backend.mips.instr.type.MipsLsType;
+import backend.mips.MipsBuilder;
+import midend.llvm.value.IrFuncValue;
+import midend.llvm.value.IrValue;
+
+public class CallInstr extends IrInstr {
+    public CallInstr(String name, IrFuncValue func, ArrayList<IrValue> args) {
+        super(func.getRetType(), name, IrInstrType.CALL);
+        addUse(func);
+        for (IrValue arg : args) {
+            addUse(arg);
+        }
+    }
+
+    public boolean callVoid() {
+        return getType().isVoid();
+    }
+
+    public IrFuncValue getCalledFunc() {
+        return (IrFuncValue) getUse(0);
+    }
+
+    public ArrayList<IrValue> getArgs() {
+        ArrayList<IrValue> args = new ArrayList<>();
+        for (int i = 1; i < getNumUses(); i++) {
+            args.add(getUse(i));
+        }
+        return args;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        if (!callVoid()) {
+            sb.append(getName() + " = ");
+        }
+        sb.append("call " + getType() + " " + getCalledFunc().getName() + "(");
+        for (int i = 1; i < getNumUses(); i++) {
+            sb.append(getUse(i).getType() + " " + getUse(i).getName());
+            if (i < getNumUses() - 1) {
+                sb.append(", ");
+            }
+        }
+        sb.append(")");
+        return sb.toString();
+    }
+
+    public void toMips() {
+        ArrayList<Register> usedRegisters = MipsBuilder.getUsedRegisters();
+        int offset = MipsBuilder.getOffset();
+        save(usedRegisters, offset);
+        ArrayList<IrValue> args = getArgs();
+        saveArgs(args, offset, usedRegisters);
+        offset -= (usedRegisters.size() + 2) * 4;
+        new MipsAlu(MipsAluType.ADDI, Register.SP, Register.SP, offset);
+        new MipsJump(MipsJumpType.JAL, getCalledFunc().getMipsLabel());
+        offset += (usedRegisters.size() + 2) * 4;
+        recover(usedRegisters, offset);
+        saveResult(this, Register.V0);
+    }
+
+    public void save(ArrayList<Register> usedRegisters, int offset) {
+        int num = 0;
+        for (Register reg : usedRegisters) {
+            num++;
+            new MipsLs(MipsLsType.SW, reg, Register.SP, offset - num * 4);
+        }
+        new MipsLs(MipsLsType.SW, Register.SP, Register.SP, offset - (num + 1) * 4);
+        new MipsLs(MipsLsType.SW, Register.RA, Register.SP, offset - (num + 2) * 4);
+    }
+
+    public void saveArgs(ArrayList<IrValue> args, int offset, ArrayList<Register> usedRegisters) {
+        int num = 0;
+        ArrayList<Register> argRegs = new ArrayList<>();
+        argRegs.add(Register.A1);
+        argRegs.add(Register.A2);
+        argRegs.add(Register.A3);
+        for (IrValue arg : args) {
+            num++;
+            if (num <= 3) { // 分配到A1、A2、A3
+                if (argRegs.contains(MipsBuilder.getRegister(arg))) {
+                    int index = usedRegisters.indexOf(MipsBuilder.getRegister(arg));
+                    new MipsLs(MipsLsType.LW, argRegs.get(num - 1), Register.SP, offset - (index + 1) * 4);
+                } else {
+                    loadValueToReg(arg, argRegs.get(num - 1));
+                }
+            } else {
+                if (MipsBuilder.getRegister(arg) == Register.K0 || argRegs.contains(MipsBuilder.getRegister(arg))) {
+                    int index = usedRegisters.indexOf(MipsBuilder.getRegister(arg));
+                    new MipsLs(MipsLsType.LW, Register.K0, Register.SP, offset - (index + 1) * 4);
+                } else {
+                    loadValueToReg(arg, Register.K0);
+                }
+                new MipsLs(MipsLsType.SW, Register.K0, Register.SP, offset - (usedRegisters.size() + num + 2) * 4);
+            }
+        }
+    }
+
+    public void recover(ArrayList<Register> usedRegisters, int offset) {
+        new MipsLs(MipsLsType.LW, Register.RA, Register.SP, 0);
+        new MipsLs(MipsLsType.LW, Register.SP, Register.SP, 4);
+        int num = 0;
+        for (Register reg : usedRegisters) {
+            num++;
+            new MipsLs(MipsLsType.LW, reg, Register.SP, offset - num * 4);
+        }
+    }
+}

midend/llvm/instr/CmpInstr.java

@@ -1,32 +1,58 @@
-package midend.llvm.instr;
-
-import midend.llvm.value.IrValue;
-import midend.llvm.type.IrInterType;
-
-public class CmpInstr extends IrInstr {
-    private CmpType cmpType;
-
-    public CmpInstr(String name, String op, IrValue lhs, IrValue rhs) {
-        super(IrInterType.BOOL, name, IrInstrType.CMP);
-        cmpType = CmpType.getCmpType(op);
-        addUse(lhs);
-        addUse(rhs);
-    }
-
-    public CmpType getCmpType() {
-        return cmpType;
-    }
-
-    public IrValue getLhs() {
-        return getUse(0);
-    }
-
-    public IrValue getRhs() {
-        return getUse(1);
-    }
-
-    public String toString() {
-        return getName() + " = " + "icmp " + cmpType.toString()
-                + " i32 " + getLhs().getName() + ", " + getRhs().getName();
-    }
-}
+package midend.llvm.instr;
+
+import midend.llvm.value.IrValue;
+import backend.mips.Register;
+import backend.mips.instr.MipsComp;
+import backend.mips.instr.type.MipsCompareType;
+import midend.llvm.type.IrInterType;
+import backend.mips.MipsBuilder;
+
+public class CmpInstr extends IrInstr {
+    private CmpType cmpType;
+
+    public CmpInstr(String name, String op, IrValue lhs, IrValue rhs) {
+        super(IrInterType.BOOL, name, IrInstrType.CMP);
+        cmpType = CmpType.getCmpType(op);
+        addUse(lhs);
+        addUse(rhs);
+    }
+
+    public CmpType getCmpType() {
+        return cmpType;
+    }
+
+    public IrValue getLhs() {
+        return getUse(0);
+    }
+
+    public IrValue getRhs() {
+        return getUse(1);
+    }
+
+    public String toString() {
+        return getName() + " = " + "icmp " + cmpType.toString()
+                + " i32 " + getLhs().getName() + ", " + getRhs().getName();
+    }
+
+    public void toMips() {
+        Register leftReg = MipsBuilder.getRegister(getLhs()) != null ? MipsBuilder.getRegister(getLhs()) : Register.K0;
+        Register rightReg = MipsBuilder.getRegister(getRhs()) != null ? MipsBuilder.getRegister(getRhs()) : Register.K1;
+        Register resultReg = MipsBuilder.getRegister(this) != null ? MipsBuilder.getRegister(this) : Register.K1;
+        loadValueToReg(getLhs(), leftReg);
+        loadValueToReg(getRhs(), rightReg);
+        if (getCmpType() == CmpType.EQ) {
+            new MipsComp(MipsCompareType.SEQ, resultReg, leftReg, rightReg);
+        } else if (getCmpType() == CmpType.NE) {
+            new MipsComp(MipsCompareType.SNE, resultReg, leftReg, rightReg);
+        } else if (getCmpType() == CmpType.SGE) {
+            new MipsComp(MipsCompareType.SGE, resultReg, leftReg, rightReg);
+        } else if (getCmpType() == CmpType.SLE) {
+            new MipsComp(MipsCompareType.SLE, resultReg, leftReg, rightReg);
+        } else if (getCmpType() == CmpType.SGT) {
+            new MipsComp(MipsCompareType.SGT, resultReg, leftReg, rightReg);
+        } else if (getCmpType() == CmpType.SLT) {
+            new MipsComp(MipsCompareType.SLT, resultReg, leftReg, rightReg);
+        }
+        saveResult(this, resultReg);
+    }
+}

midend/llvm/instr/CmpType.java

@@ -1,48 +1,48 @@
-package midend.llvm.instr;
-
-public enum CmpType {
-    EQ,
-    NE,
-    SGT,
-    SGE,
-    SLT,
-    SLE;
-
-    public static CmpType getCmpType(String op) {
-        switch (op) {
-            case "==":
-                return EQ;
-            case "!=":
-                return NE;
-            case ">":
-                return SGT;
-            case ">=":
-                return SGE;
-            case "<":
-                return SLT;
-            case "<=":
-                return SLE;
-            default:
-                return null;
-        }
-    }
-
-    public String toString() {
-        switch (this) {
-            case EQ:
-                return "eq";
-            case NE:
-                return "ne";
-            case SGT:
-                return "sgt";
-            case SGE:
-                return "sge";
-            case SLT:
-                return "slt";
-            case SLE:
-                return "sle";
-            default:
-                return null;
-        }
-    }
-}
+package midend.llvm.instr;
+
+public enum CmpType {
+    EQ,
+    NE,
+    SGT,
+    SGE,
+    SLT,
+    SLE;
+
+    public static CmpType getCmpType(String op) {
+        switch (op) {
+            case "==":
+                return EQ;
+            case "!=":
+                return NE;
+            case ">":
+                return SGT;
+            case ">=":
+                return SGE;
+            case "<":
+                return SLT;
+            case "<=":
+                return SLE;
+            default:
+                return null;
+        }
+    }
+
+    public String toString() {
+        switch (this) {
+            case EQ:
+                return "eq";
+            case NE:
+                return "ne";
+            case SGT:
+                return "sgt";
+            case SGE:
+                return "sge";
+            case SLT:
+                return "slt";
+            case SLE:
+                return "sle";
+            default:
+                return null;
+        }
+    }
+}

midend/llvm/instr/ExtendInstr.java

@@ -1,31 +1,42 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrType;
-import midend.llvm.value.IrValue;
-
-public class ExtendInstr extends IrInstr {
-    private IrType targetType;
-
-    public ExtendInstr(String name, IrType targetType, IrValue src) {
-        super(targetType, name, IrInstrType.EXTEND);
-        this.targetType = targetType;
-        addUse(src);
-    }
-
-    public IrValue getSrc() {
-        return getUse(0);
-    }
-
-    public IrType getTargetType() {
-        return this.targetType;
-    }
-
-    public IrType getSrcType() {
-        return getSrc().getType();
-    }
-
-    public String toString() {
-        return getName() + " = zext " + getSrc().getType()
-                + " " + getSrc().getName() + " to " + getTargetType();
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.MipsBuilder;
+import backend.mips.Register;
+import midend.llvm.type.IrType;
+import midend.llvm.value.IrValue;
+
+public class ExtendInstr extends IrInstr {
+    private IrType targetType;
+
+    public ExtendInstr(String name, IrType targetType, IrValue src) {
+        super(targetType, name, IrInstrType.EXTEND);
+        this.targetType = targetType;
+        addUse(src);
+    }
+
+    public IrValue getSrc() {
+        return getUse(0);
+    }
+
+    public IrType getTargetType() {
+        return this.targetType;
+    }
+
+    public IrType getSrcType() {
+        return getSrc().getType();
+    }
+
+    public String toString() {
+        return getName() + " = zext " + getSrc().getType()
+                + " " + getSrc().getName() + " to " + getTargetType();
+    }
+
+    public void toMips() {
+        Register reg = MipsBuilder.getRegister(this);
+        if (reg == null) {
+            reg = Register.K0;
+        } 
+        loadValueToReg(getSrc(), reg);
+        saveResult(this, reg);
+    }
+}

midend/llvm/instr/GepInstr.java

@@ -1,57 +1,86 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrArrayType;
-import midend.llvm.type.IrPointerType;
-import midend.llvm.type.IrType;
-import midend.llvm.value.IrValue;
-
-public class GepInstr extends IrInstr {
-    public GepInstr(IrValue pointer, IrValue offset, String name) {
-        super(new IrPointerType(getTargetType(pointer)), name, IrInstrType.GEP);
-        addUse(pointer);
-        addUse(offset);
-    }
-
-    public IrValue getPointer() {
-        return getUse(0);
-    }
-
-    public IrValue getOffset() {
-        return getUse(1);
-    }
-
-    public String toString() {
-        IrValue pointer = this.getPointer();
-        IrValue offset = this.getOffset();
-
-        IrPointerType pointerType = (IrPointerType) pointer.getType();
-        IrType targetType = pointerType.getPointeeType();
-
-        if (targetType instanceof IrArrayType arrayType) {
-            return getName() + " = getelementptr inbounds " +
-                    arrayType + ", " +
-                    pointerType + " " +
-                    pointer.getName() + ", i32 0, " +
-                    offset.getType() + " " +
-                    offset.getName();
-        } else {
-            return getName() + " = getelementptr inbounds " +
-                    targetType + ", " +
-                    pointerType + " " +
-                    pointer.getName() + ", " +
-                    offset.getType() + " " +
-                    offset.getName();   
-        }
-    }
-
-    public static IrType getTargetType(IrValue pointer) {
-        IrType targetType = ((IrPointerType) pointer.getType()).getPointeeType();
-        if (targetType instanceof IrArrayType arrayType) {
-            return arrayType.getElementType();
-        } else if (targetType instanceof IrPointerType pointerType) {
-            return pointerType.getPointeeType();
-        } else {
-            return targetType;
-        }
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.MipsBuilder;
+import backend.mips.Register;
+import backend.mips.instr.MipsAlu;
+import backend.mips.instr.type.MipsAluType;
+import midend.llvm.constant.IrConstantInt;
+import midend.llvm.type.IrArrayType;
+import midend.llvm.type.IrPointerType;
+import midend.llvm.type.IrType;
+import midend.llvm.value.IrValue;
+
+public class GepInstr extends IrInstr {
+    public GepInstr(IrValue pointer, IrValue offset, String name) {
+        super(new IrPointerType(getTargetType(pointer)), name, IrInstrType.GEP);
+        addUse(pointer);
+        addUse(offset);
+    }
+
+    public IrValue getPointer() {
+        return getUse(0);
+    }
+
+    public IrValue getOffset() {
+        return getUse(1);
+    }
+
+    public String toString() {
+        IrValue pointer = this.getPointer();
+        IrValue offset = this.getOffset();
+
+        IrPointerType pointerType = (IrPointerType) pointer.getType();
+        IrType targetType = pointerType.getPointeeType();
+
+        if (targetType instanceof IrArrayType arrayType) {
+            return getName() + " = getelementptr inbounds " +
+                    arrayType + ", " +
+                    pointerType + " " +
+                    pointer.getName() + ", i32 0, " +
+                    offset.getType() + " " +
+                    offset.getName();
+        } else {
+            return getName() + " = getelementptr inbounds " +
+                    targetType + ", " +
+                    pointerType + " " +
+                    pointer.getName() + ", " +
+                    offset.getType() + " " +
+                    offset.getName();   
+        }
+    }
+
+    public static IrType getTargetType(IrValue pointer) {
+        IrType targetType = ((IrPointerType) pointer.getType()).getPointeeType();
+        if (targetType instanceof IrArrayType arrayType) {
+            return arrayType.getElementType();
+        } else if (targetType instanceof IrPointerType pointerType) {
+            return pointerType.getPointeeType();
+        } else {
+            return targetType;
+        }
+    }
+
+    public void toMips() {
+        Register pointerReg = MipsBuilder.getRegister(getPointer());
+        if (pointerReg == null) {
+            pointerReg = Register.K0;
+        }
+        loadValueToReg(getPointer(), pointerReg);
+        Register offsetReg = MipsBuilder.getRegister(getOffset());
+        if (offsetReg == null) {
+            offsetReg = Register.K1;
+        }
+        Register resultReg = MipsBuilder.getRegister(this);
+        if (resultReg == null) {
+            resultReg = Register.K1;
+        }
+        if (getOffset() instanceof IrConstantInt intOffset) {
+            new MipsAlu(MipsAluType.ADDI, resultReg, pointerReg, 4 * intOffset.getValue());
+        } else {
+            loadValueToReg(getOffset(), offsetReg);
+            new MipsAlu(MipsAluType.SLL, resultReg, offsetReg, 2);
+            new MipsAlu(MipsAluType.ADDU, resultReg, resultReg, pointerReg);
+        }
+        saveResult(this, resultReg);
+    }
+}

midend/llvm/instr/GetIntInstr.java

@@ -1,17 +1,26 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrInterType;
-
-public class GetIntInstr extends IrInstr {
-    public GetIntInstr(String name) {
-        super(IrInterType.INT32, name, IrInstrType.IO);
-    }
-
-    public String toString() {
-        return getName() + " = call i32 @getint()";
-    }
-
-    public static String getIntDecl() {
-        return "declare i32 @getint()";
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.Register;
+import backend.mips.instr.MipsSyscall;
+import backend.mips.instr.fake.MipsLi;
+import midend.llvm.type.IrInterType;
+
+public class GetIntInstr extends IrInstr {
+    public GetIntInstr(String name) {
+        super(IrInterType.INT32, name, IrInstrType.IO);
+    }
+
+    public String toString() {
+        return getName() + " = call i32 @getint()";
+    }
+
+    public static String getIntDecl() {
+        return "declare i32 @getint()";
+    }
+
+    public void toMips() {
+        new MipsLi(Register.V0, 5);
+        new MipsSyscall();
+        saveResult(this, Register.V0);
+    }
+}

midend/llvm/instr/IrInstr.java

@@ -1,28 +1,75 @@
-package midend.llvm.instr;
-
-import midend.llvm.use.IrUser;
-import midend.llvm.value.IrBasicBlock;
-import midend.llvm.type.IrType;
-
-public class IrInstr extends IrUser {
-    private IrInstrType type;
-    private IrBasicBlock block;
-
-    public IrInstr(IrType type, String name, IrInstrType instrType) {
-        super(type, name);
-        this.type = instrType;
-        this.block = null;
-    }
-
-    public IrInstrType getInstrType() {
-        return type;
-    }
-
-    public IrBasicBlock getBBlock() {
-        return block;
-    }
-
-    public void setBBlock(IrBasicBlock block) {
-        this.block = block;
-    }
-}
+package midend.llvm.instr;
+
+import midend.llvm.use.IrUser;
+import midend.llvm.value.IrBasicBlock;
+import midend.llvm.value.IrGlobalValue;
+import midend.llvm.value.IrValue;
+import midend.llvm.constant.IrConstantInt;
+import backend.mips.MipsBuilder;
+import backend.mips.Register;
+import backend.mips.instr.MipsLs;
+import backend.mips.instr.fake.MipsLa;
+import backend.mips.instr.fake.MipsLi;
+import backend.mips.instr.fake.MipsMove;
+import backend.mips.instr.type.MipsLsType;
+import midend.llvm.type.IrType;
+
+public class IrInstr extends IrUser {
+    private IrInstrType type;
+    private IrBasicBlock block;
+
+    public IrInstr(IrType type, String name, IrInstrType instrType) {
+        super(type, name);
+        this.type = instrType;
+        this.block = null;
+    }
+
+    public IrInstrType getInstrType() {
+        return type;
+    }
+
+    public IrBasicBlock getBBlock() {
+        return block;
+    }
+
+    public void setBBlock(IrBasicBlock block) {
+        this.block = block;
+    }
+
+    public void saveResult(IrValue value, Register reg) {
+        Register valueReg = MipsBuilder.getRegister(value);
+        if (valueReg == null) {
+            Integer offset = MipsBuilder.getOffset(value);
+            if (offset == null) {
+                MipsBuilder.allocaOffset(value);
+                offset = MipsBuilder.getOffset(value);
+            }
+            new MipsLs(MipsLsType.SW, reg, Register.SP, offset);
+        } else {
+            new MipsMove(valueReg, reg);
+        }
+    }
+
+    public void loadValueToReg(IrValue value, Register reg) {
+        if (value instanceof IrGlobalValue) {
+            new MipsLa(reg, value.getMipsLabel());
+            return;
+        }
+        if (value instanceof IrConstantInt) {
+            new MipsLi(reg, ((IrConstantInt) value).getValue());
+            return;
+        }
+
+        Register valueReg = MipsBuilder.getRegister(value);
+        if (valueReg != null) {
+            new MipsMove(reg, valueReg);
+            return;
+        }
+        Integer offset = MipsBuilder.getOffset(value);
+        if (offset == null) {
+            MipsBuilder.allocaOffset(value);
+            offset = MipsBuilder.getOffset(value);
+        }
+        new MipsLs(MipsLsType.LW, reg, Register.SP, offset);
+    }
+}

midend/llvm/instr/IrInstrType.java

@@ -1,18 +1,18 @@
-package midend.llvm.instr;
-
-public enum IrInstrType {
-    ALU,
-    CMP,
-    CALL,
-    ALLOCA,
-    LOAD,
-    STORE,
-    GEP,
-    PHI,
-    EXTEND,
-    TRUNC,
-    BR,
-    RET,
-    JUMP,
-    IO
-}
+package midend.llvm.instr;
+
+public enum IrInstrType {
+    ALU,
+    CMP,
+    CALL,
+    ALLOCA,
+    LOAD,
+    STORE,
+    GEP,
+    PHI,
+    EXTEND,
+    TRUNC,
+    BR,
+    RET,
+    JUMP,
+    IO
+}

midend/llvm/instr/JumpInstr.java

@@ -1,20 +1,25 @@
-package midend.llvm.instr;
-
-import midend.llvm.value.IrBasicBlock;
-import midend.llvm.type.IrInterType;
-
-public class JumpInstr extends IrInstr {
-    public JumpInstr(IrBasicBlock targetBlock) {
-        super(IrInterType.VOID, "jump", IrInstrType.JUMP);
-        addUse(targetBlock);
-    }
-
-    public IrBasicBlock getTargetBlock() {
-        return (IrBasicBlock) getUse(0);
-    }
-
-    public String toString() {
-        return "br label " + "%" + getTargetBlock().getName();
-    }
-}
-// TODO:所有的指令的基本块设置还需完善
+package midend.llvm.instr;
+
+import midend.llvm.value.IrBasicBlock;
+import backend.mips.instr.MipsJump;
+import backend.mips.instr.type.MipsJumpType;
+import midend.llvm.type.IrInterType;
+
+public class JumpInstr extends IrInstr {
+    public JumpInstr(IrBasicBlock targetBlock) {
+        super(IrInterType.VOID, "jump", IrInstrType.JUMP);
+        addUse(targetBlock);
+    }
+
+    public IrBasicBlock getTargetBlock() {
+        return (IrBasicBlock) getUse(0);
+    }
+
+    public String toString() {
+        return "br label " + "%" + getTargetBlock().getName();
+    }
+
+    public void toMips() {
+        new MipsJump(MipsJumpType.J, getTargetBlock().getMipsLabel()); //TODO: 该用JAL吗？
+    }
+}

midend/llvm/instr/LoadInstr.java

@@ -1,20 +1,39 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrPointerType;
-import midend.llvm.value.IrValue;
-
-public class LoadInstr extends IrInstr {
-    public LoadInstr(IrValue pointer, String name) {
-        super(((IrPointerType) pointer.getType()).getPointeeType(), name, IrInstrType.LOAD);
-        addUse(pointer);
-    }
-
-    public IrValue getPointer() {
-        return getUse(0);
-    }
-
-    public String toString() {
-        return getName() + " = load " + getType() + ", "
-                + getPointer().getType() + " " + getPointer().getName();
-    }
-}
+package midend.llvm.instr;
+
+import backend.mips.MipsBuilder;
+import backend.mips.Register;
+import backend.mips.instr.MipsLs;
+import backend.mips.instr.type.MipsLsType;
+import midend.llvm.type.IrPointerType;
+import midend.llvm.value.IrValue;
+
+public class LoadInstr extends IrInstr {
+    public LoadInstr(IrValue pointer, String name) {
+        super(((IrPointerType) pointer.getType()).getPointeeType(), name, IrInstrType.LOAD);
+        addUse(pointer);
+    }
+
+    public IrValue getPointer() {
+        return getUse(0);
+    }
+
+    public String toString() {
+        return getName() + " = load " + getType() + ", "
+                + getPointer().getType() + " " + getPointer().getName();
+    }
+
+    public void toMips() {
+        IrValue pointer = getPointer();
+        Register reg = MipsBuilder.getRegister(pointer);
+        if (reg == null) { // 未分配寄存器情况
+            reg = Register.K0;
+        }
+        loadValueToReg(pointer, reg);
+        Register resultReg = MipsBuilder.getRegister(this);
+        if (resultReg == null) {
+            resultReg = Register.K1;
+        }
+        new MipsLs(MipsLsType.LW, resultReg, reg, 0);
+        saveResult(this, resultReg);
+    }
+}

midend/llvm/instr/PutChInstr.java

@@ -1,19 +1,28 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrInterType;
-import midend.llvm.value.IrValue;
-
-public class PutChInstr extends IrInstr {
-    public PutChInstr(String name, IrValue putValue) {
-        super(IrInterType.VOID, name, IrInstrType.IO);
-        addUse(putValue);
-    }
-
-    public String toString() {
-        return "call void @putch(i32 " + getUses().get(0).getName() + ")";
-    }
-
-    public static String putChDecl() {
-        return "declare void @putch(i32)";
-    }
-}
+package midend.llvm.instr;
+
+import midend.llvm.type.IrInterType;
+import midend.llvm.value.IrValue;
+import backend.mips.Register;
+import backend.mips.instr.fake.MipsLi;
+import backend.mips.instr.MipsSyscall;
+
+public class PutChInstr extends IrInstr {
+    public PutChInstr(String name, IrValue putValue) {
+        super(IrInterType.VOID, name, IrInstrType.IO);
+        addUse(putValue);
+    }
+
+    public String toString() {
+        return "call void @putch(i32 " + getUses().get(0).getName() + ")";
+    }
+
+    public static String putChDecl() {
+        return "declare void @putch(i32)";
+    }
+
+    public void toMips() {
+        loadValueToReg(getUse(0), Register.A0);
+        new MipsLi(Register.V0, 11);
+        new MipsSyscall();
+    }
+}

midend/llvm/instr/PutIntInstr.java

@@ -1,19 +1,28 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrInterType;
-import midend.llvm.value.IrValue;
-
-public class PutIntInstr extends IrInstr {
-    public PutIntInstr(String name, IrValue putValue) {
-        super(IrInterType.VOID, name, IrInstrType.IO);
-        addUse(putValue);
-    }
-
-    public String toString() {
-        return "call void @putint(i32 " + getUses().get(0).getName() + ")";
-    }
-
-    public static String putIntDecl() {
-        return "declare void @putint(i32)";
-    }
-}
+package midend.llvm.instr;
+
+import midend.llvm.type.IrInterType;
+import midend.llvm.value.IrValue;
+import backend.mips.Register;
+import backend.mips.instr.fake.MipsLi;
+import backend.mips.instr.MipsSyscall;
+
+public class PutIntInstr extends IrInstr {
+    public PutIntInstr(String name, IrValue putValue) {
+        super(IrInterType.VOID, name, IrInstrType.IO);
+        addUse(putValue);
+    }
+
+    public String toString() {
+        return "call void @putint(i32 " + getUses().get(0).getName() + ")";
+    }
+
+    public static String putIntDecl() {
+        return "declare void @putint(i32)";
+    }
+
+    public void toMips() {
+        loadValueToReg(getUse(0), Register.A0);
+        new MipsLi(Register.V0, 1);
+        new MipsSyscall();
+    }
+}

midend/llvm/instr/PutStrInstr.java

@@ -1,26 +1,36 @@
-package midend.llvm.instr;
-
-import midend.llvm.type.IrInterType;
-import midend.llvm.type.IrPointerType;
-import midend.llvm.constant.IrConstantStr;
-
-public class PutStrInstr extends IrInstr {
-    private IrConstantStr strVal;
-
-    public PutStrInstr(String name, IrConstantStr putValue) {
-        super(IrInterType.VOID, name, IrInstrType.IO);
-        addUse(putValue);
-        strVal = putValue;
-    }
-
-    public static String putStrDecl() {
-        return "declare void @putstr(i8*)";
-    }
-
-    public String toString() {
-        IrPointerType ptrType = (IrPointerType) strVal.getType();
-        return "call void @putstr(i8* getelementptr inbounds ("
-                + ptrType.getPointeeType() + ", " + ptrType + 
-                " " + strVal.getName() + ", i32 0, i32 0))";
-    }
-}
+package midend.llvm.instr;
+
+import midend.llvm.type.IrInterType;
+import midend.llvm.type.IrPointerType;
+import backend.mips.instr.fake.MipsLa;
+import midend.llvm.constant.IrConstantStr;
+import backend.mips.instr.fake.MipsLi;
+import backend.mips.instr.MipsSyscall;
+import backend.mips.Register;
+
+public class PutStrInstr extends IrInstr {
+    private IrConstantStr strVal;
+
+    public PutStrInstr(String name, IrConstantStr putValue) {
+        super(IrInterType.VOID, name, IrInstrType.IO);
+        addUse(putValue);
+        strVal = putValue;
+    }
+
+    public static String putStrDecl() {
+        return "declare void @putstr(i8*)";
+    }
+
+    public String toString() {
+        IrPointerType ptrType = (IrPointerType) strVal.getType();
+        return "call void @putstr(i8* getelementptr inbounds ("
+                + ptrType.getPointeeType() + ", " + ptrType + 
+                " " + strVal.getName() + ", i32 0, i32 0))";
+    }
+
+    public void toMips() {
+        new MipsLa(Register.A0, strVal.getMipsLabel());
+        new MipsLi(Register.V0, 4);
+        new MipsSyscall();
+    }
+}