JCNC/SCompiler
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Luke 2025-05-07 20:05:20 +08:00
parent de21808c2c
commit d4c8aea05f
2 changed files with 46 additions and 37 deletions
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63
src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java
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@ -2,7 +2,10 @@ package org.jcnc.snow.compiler.backend;
import org.jcnc.snow.compiler.ir.core.IRFunction;
import org.jcnc.snow.compiler.ir.core.IRInstruction;
import org.jcnc.snow.compiler.ir.instruction.*;
import org.jcnc.snow.compiler.ir.instruction.BinaryOperationInstruction;
import org.jcnc.snow.compiler.ir.instruction.LoadConstInstruction;
import org.jcnc.snow.compiler.ir.instruction.ReturnInstruction;
import org.jcnc.snow.compiler.ir.instruction.UnaryOperationInstruction;
import org.jcnc.snow.compiler.ir.value.IRConstant;
import org.jcnc.snow.compiler.ir.value.IRVirtualRegister;
import org.jcnc.snow.vm.engine.VMOpCode;
@ -18,17 +21,19 @@ import java.util.Map;
*/
public final class VMCodeGenerator {
private final Map<IRVirtualRegister,Integer> slotMap;
private final Map<IRVirtualRegister, Integer> slotMap;
private final List<String> code = new ArrayList<>();
private String currentFnName; // ← 当前正在生成的函数名
public VMCodeGenerator(Map<IRVirtualRegister,Integer> slotMap){
public VMCodeGenerator(Map<IRVirtualRegister, Integer> slotMap) {
this.slotMap = slotMap;
}
/** 主入口：IR → 指令序列 */
public List<String> generate(IRFunction fn){
/**
* 主入口：IR → 指令序列
*/
public List<String> generate(IRFunction fn) {
currentFnName = fn.name(); // ← 保存函数名
for (IRInstruction inst : fn.body()) {
@ -37,7 +42,7 @@ public final class VMCodeGenerator {
case BinaryOperationInstruction b -> genBinOp(b);
case UnaryOperationInstruction u -> genUnary(u);
case ReturnInstruction r -> genRet(r);
default -> throw new IllegalStateException("Unsupported IR: "+inst);
default -> throw new IllegalStateException("Unsupported IR: " + inst);
}
}
/* 注意：不再额外添加 HALT，结束行为由 genRet 决定 */
@ -46,43 +51,43 @@ public final class VMCodeGenerator {
/* ───────────── 指令生成 ───────────── */
private void genLoadConst(LoadConstInstruction c){
IRConstant k = (IRConstant)c.operands().get(0);
private void genLoadConst(LoadConstInstruction c) {
IRConstant k = (IRConstant) c.operands().get(0);
emit(op("I_PUSH"), k.value().toString());
emit(op("I_STORE"), slot(c.dest())+"");
emit(op("I_STORE"), slot(c.dest()) + "");
}
private void genBinOp(BinaryOperationInstruction b){
emit(op("I_LOAD"), slot((IRVirtualRegister)b.operands().get(0))+"");
emit(op("I_LOAD"), slot((IRVirtualRegister)b.operands().get(1))+"");
private void genBinOp(BinaryOperationInstruction b) {
emit(op("I_LOAD"), slot((IRVirtualRegister) b.operands().get(0)) + "");
emit(op("I_LOAD"), slot((IRVirtualRegister) b.operands().get(1)) + "");
String opcode = switch (b.op()){
String opcode = switch (b.op()) {
case ADD_I32 -> "I_ADD";
case SUB_I32 -> "I_SUB";
case MUL_I32 -> "I_MUL";
case DIV_I32 -> "I_DIV";
default -> throw new IllegalStateException("Unsupported bin op "+b.op());
default -> throw new IllegalStateException("Unsupported bin op " + b.op());
};
emit(op(opcode));
emit(op("I_STORE"), slot(b.dest())+"");
emit(op("I_STORE"), slot(b.dest()) + "");
}
private void genUnary(UnaryOperationInstruction u){
emit(op("I_LOAD"), slot((IRVirtualRegister)u.operands().get(0))+"");
private void genUnary(UnaryOperationInstruction u) {
emit(op("I_LOAD"), slot((IRVirtualRegister) u.operands().get(0)) + "");
String opcode = switch (u.op()){
String opcode = switch (u.op()) {
case NEG_I32 -> "I_NEG";
default -> throw new IllegalStateException("Unsupported unary op "+u.op());
default -> throw new IllegalStateException("Unsupported unary op " + u.op());
};
emit(op(opcode));
emit(op("I_STORE"), slot(u.dest())+"");
emit(op("I_STORE"), slot(u.dest()) + "");
}
private void genRet(ReturnInstruction r){
private void genRet(ReturnInstruction r) {
/* — 主函数：加载返回值(若有) → HALT — */
if ("main".equals(currentFnName)) {
if (r.value() != null) {
emit(op("I_LOAD"), slot(r.value())+"");
emit(op("I_LOAD"), slot(r.value()) + "");
}
emit(op("HALT")); // 结束整个程序
return;
@ -90,29 +95,29 @@ public final class VMCodeGenerator {
/* — 普通函数：LOAD (可选) → RET — */
if (r.value() != null) {
emit(op("I_LOAD"), slot(r.value())+"");
emit(op("I_LOAD"), slot(r.value()) + "");
}
emit(op("RET"));
}
/* ───────────── 工具函数 ───────────── */
private int slot(IRVirtualRegister r){
private int slot(IRVirtualRegister r) {
Integer s = slotMap.get(r);
if (s == null) throw new IllegalStateException("Register "+r+" 未映射槽位");
if (s == null) throw new IllegalStateException("Register " + r + " 未映射槽位");
return s;
}
private String op(String name){
private String op(String name) {
try {
Field f = VMOpCode.class.getField(name);
return f.get(null).toString();
} catch (Exception e){
throw new RuntimeException("Unknown opcode "+name, e);
} catch (Exception e) {
throw new RuntimeException("Unknown opcode " + name, e);
}
}
private void emit(String opcode, String... args){
private void emit(String opcode, String... args) {
StringBuilder sb = new StringBuilder(opcode);
for (String a : args) sb.append(' ').append(a);
code.add(sb.toString());

8
src/main/java/org/jcnc/snow/compiler/ir/instruction/LoadConstInstruction.java
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@ -14,10 +14,14 @@ import java.util.List;
* 将字面量常量 k 加载到目标虚拟寄存器 dest 中，以便后续指令使用该常量值。
*/
public final class LoadConstInstruction extends IRInstruction {
/** 要加载的常量值 */
/**
* 要加载的常量值
*/
private final IRConstant k;
/** 存放常量的目标虚拟寄存器 */
/**
* 存放常量的目标虚拟寄存器
*/
private final IRVirtualRegister dest;
/**