支持多参数

src/main/java/org/jcnc/snow/compiler/backend/VMCodeGenerator.java

@@ -9,39 +9,35 @@ import java.lang.reflect.Field;
 import java.util.Map;
 
 /**
- * 将单个 IRFunction 转换成 VM 指令并写入 VMProgramBuilder。
+ * Generates VM code for a single IRFunction.
  */
 public final class VMCodeGenerator {
 
-    private final Map<IRVirtualRegister, Integer> slotMap;
+    private final Map<IRVirtualRegister,Integer> slotMap;
     private final VMProgramBuilder out;
     private String currentFn;
 
-    public VMCodeGenerator(Map<IRVirtualRegister, Integer> slotMap,
+    public VMCodeGenerator(Map<IRVirtualRegister,Integer> slotMap,
                            VMProgramBuilder out) {
         this.slotMap = slotMap;
         this.out     = out;
     }
 
-    /** 主入口：生成当前函数全部指令（无返回值，直接写入 builder） */
     public void generate(IRFunction fn) {
         currentFn = fn.name();
-        out.beginFunction(currentFn);           // 记录入口
+        out.beginFunction(currentFn);
 
-        for (IRInstruction inst : fn.body()) {
+        for (IRInstruction inst : fn.body()) switch (inst) {
-            switch (inst) {
             case LoadConstInstruction      c -> genLoadConst(c);
             case BinaryOperationInstruction b -> genBinOp(b);
             case UnaryOperationInstruction  u -> genUnary(u);
             case CallInstruction           c -> genCall(c);
             case ReturnInstruction         r -> genRet(r);
-                default -> throw new IllegalStateException(
+            default -> throw new IllegalStateException("Unsupported IR: "+inst);
-                        "Unsupported IR: " + inst);
-            }
         }
     }
 
-    /* ---------- 指令生成 ---------- */
+    /* ---------- helpers ---------- */
 
     private void genLoadConst(LoadConstInstruction c) {
         IRConstant k = (IRConstant) c.operands().getFirst();
@@ -62,17 +58,14 @@ public final class VMCodeGenerator {
         emit(op("I_STORE"), slot(u.dest()));
     }
 
+    /** Generates CALL addr nArgs */
     private void genCall(CallInstruction c) {
-        // 实参入栈
+        /* push arguments in IR order (already left-to-right) */
         for (IRValue arg : c.getArguments()) {
-            if (arg instanceof IRVirtualRegister reg)
+            emit(op("I_LOAD"), slot((IRVirtualRegister) arg));
-                emit(op("I_LOAD"), slot(reg));
-            else
-                throw new IllegalStateException("Unsupported arg: " + arg);
         }
-        // 生成 CALL（由 builder 解析地址/回填）
+        int nArgs = c.getArguments().size();
-        out.emitCall(c.getFunctionName());
+        out.emitCall(c.getFunctionName(), nArgs);
-        // 存放返回值
         emit(op("I_STORE"), slot(c.getDest()));
     }
 
@@ -82,8 +75,6 @@ public final class VMCodeGenerator {
         emit("main".equals(currentFn) ? op("HALT") : op("RET"));
     }
 
-    /* ---------- 工具 ---------- */
-
     private void emit(String opcode, String... args) {
         StringBuilder sb = new StringBuilder(opcode);
         for (String a : args) sb.append(' ').append(a);
@@ -91,10 +82,7 @@ public final class VMCodeGenerator {
     }
 
     private String slot(IRVirtualRegister r) {
-        Integer s = slotMap.get(r);
+        return slotMap.get(r).toString();
-        if (s == null)
-            throw new IllegalStateException("Unmapped register: " + r);
-        return s.toString();
     }
 
     private String op(String name) {
@@ -102,7 +90,7 @@ public final class VMCodeGenerator {
             Field f = VMOpCode.class.getField(name);
             return f.get(null).toString();
         } catch (Exception e) {
-            throw new RuntimeException("Unknown opcode: " + name, e);
+            throw new RuntimeException("Unknown opcode: "+name, e);
         }
     }
 }

src/main/java/org/jcnc/snow/compiler/backend/VMProgramBuilder.java

@@ -5,75 +5,64 @@ import org.jcnc.snow.vm.engine.VMOpCode;
 import java.util.*;
 
 /**
- * 负责生成整段 VM 指令：
+ * Builds a linear VM program, resolving CALL addresses even if the
- * 1. 为每个函数登记入口地址（label → pc）
+ * target function appears later.  Now emits “CALL <addr> <nArgs>”.
- * 2. 生成指令并维护全局 pc 计数
- * 3. 支持前向调用：CALL 时目标函数尚未出现也能写占位并在后续回填
- * 4. 允许模块前缀（CommonTasks.test）与简名（test）互相解析
  */
 public final class VMProgramBuilder {
 
+    private record Fix(int index, String target, int nArgs) {}
+
     private static final String PLACEHOLDER = "-1";
-    private record Fixup(int index, String target) {}
 
     private final List<String> code = new ArrayList<>();
-    private final Map<String, Integer> labelMap = new HashMap<>();
+    private final Map<String,Integer> labelAddr = new HashMap<>();
-    private final List<Fixup> unresolved        = new ArrayList<>();
+    private final List<Fix> unresolved = new ArrayList<>();
     private int pc = 0;
 
-    /* 在写入函数体指令之前调用 —— 记录入口地址并回填之前的前向 CALL */
+    /* ---------- public API ---------- */
+
     public void beginFunction(String name) {
-        labelMap.put(name, pc);
+        labelAddr.put(name, pc);
-        patchFixupsFor(name);
+        patchFixesFor(name);
     }
 
-    /* 普通指令 */
     public void emit(String line) {
         code.add(line);
         pc++;
     }
 
-    /* 生成 CALL，自动解析前缀 / 回填 */
+    /** Emits CALL addr nArgs (addr may be unknown yet). */
-    public void emitCall(String target) {
+    public void emitCall(String targetFn, int nArgs) {
-        Integer addr = resolveAddr(target);
+        Integer addr = resolve(targetFn);
         if (addr != null) {
-            emit(VMOpCode.CALL + " " + addr);
+            emit(VMOpCode.CALL + " " + addr + " " + nArgs);
         } else {
-            emit(VMOpCode.CALL + " " + PLACEHOLDER);        // 写占位
+            emit(VMOpCode.CALL + " " + PLACEHOLDER + " " + nArgs);
-            unresolved.add(new Fixup(pc - 1, target));
+            unresolved.add(new Fix(pc-1, targetFn, nArgs));
         }
     }
 
-    /* 构建最终代码，若还有悬而未决的前向调用则报错 */
     public List<String> build() {
-        if (!unresolved.isEmpty()) {
+        if (!unresolved.isEmpty())
-            String msg = "Unresolved CALL targets: " +
+            throw new IllegalStateException("Unresolved CALL targets: "+unresolved);
-                    unresolved.stream().map(f -> f.target).toList();
-            throw new IllegalStateException(msg);
-        }
         return List.copyOf(code);
     }
 
-    /* ---------- 私有辅助 ---------- */
+    /* ---------- internal helpers ---------- */
 
-    /** 解析 label：先查原样，再查去掉模块前缀后的简名 */
+    private Integer resolve(String label) {
-    private Integer resolveAddr(String label) {
+        Integer a = labelAddr.get(label);
-        Integer addr = labelMap.get(label);
+        if (a == null && label.contains(".")) {
-        if (addr == null && label.contains(".")) {
+            a = labelAddr.get(label.substring(label.lastIndexOf('.')+1));
-            String simple = label.substring(label.lastIndexOf('.') + 1);
-            addr = labelMap.get(simple);
         }
-        return addr;
+        return a;
     }
 
-    /** 当某个函数登记入口后，回填此前针对它的占位 CALL */
+    private void patchFixesFor(String name) {
-    private void patchFixupsFor(String name) {
+        for (Iterator<Fix> it = unresolved.iterator(); it.hasNext();) {
-        for (Iterator<Fixup> it = unresolved.iterator(); it.hasNext(); ) {
+            Fix f = it.next();
-            Fixup f = it.next();
+            if (f.target.equals(name) || f.target.endsWith("."+name)) {
-            boolean match = f.target.equals(name) ||
+                code.set(f.index, VMOpCode.CALL + " " + pc + " " + f.nArgs);
-                    f.target.endsWith("." + name);
-            if (match) {
-                code.set(f.index, VMOpCode.CALL + " " + pc);
                 it.remove();
             }
         }

src/main/java/org/jcnc/snow/vm/commands/function/CallCommand.java

@@ -5,8 +5,9 @@ import org.jcnc.snow.vm.interfaces.Command;
 import org.jcnc.snow.vm.module.*;
 
 /**
- * CALL 指令 —— 创建新栈帧并跳转到目标地址，同时把实参从操作数栈
+ * CALL addr nArgs — pushes a new stack-frame, transfers the specified
- * 写入被调函数的局部变量表（目前只处理 1 个参数）。
+ * argument count from the operand stack into the callee’s local slots
+ * 0‥n-1 (left-to-right), then jumps to {@code addr}.
  */
 public class CallCommand implements Command {
 
@@ -17,39 +18,33 @@ public class CallCommand implements Command {
                        LocalVariableStore callerLVS,
                        CallStack callStack) {
 
-        /* ---------- 解析地址 ---------- */
+        if (parts.length < 3)
-        if (parts.length < 2)
+            throw new IllegalArgumentException("CALL: need <addr> <nArgs>");
-            throw new IllegalArgumentException("CALL: missing target address");
 
         int targetAddr;
+        int nArgs;
         try {
             targetAddr = Integer.parseInt(parts[1]);
+            nArgs      = Integer.parseInt(parts[2]);
         } catch (NumberFormatException e) {
-            throw new IllegalArgumentException("CALL: invalid address " + parts[1], e);
+            throw new IllegalArgumentException("CALL: malformed operands", e);
         }
 
-        /* ---------- 创建新栈帧 ---------- */
+        /* build new frame & local table for callee */
         LocalVariableStore calleeLVS = new LocalVariableStore(VMMode.RUN);
 
-        /* ---------- 处理 1 个实参 ---------- */
+        /* transfer arguments: operand stack top is last arg */
+        for (int slot = nArgs - 1; slot >= 0; slot--) {
             if (operandStack.isEmpty())
-            throw new IllegalStateException("CALL: operand stack empty, missing argument");
+                throw new IllegalStateException("CALL: operand stack underflow");
-        Object arg0 = operandStack.pop();         // 弹出栈顶实参
+            calleeLVS.setVariable(slot, operandStack.pop());
-        calleeLVS.setVariable(0, arg0);           // 写入槽 0
-
-        /* 若将来有多个参数，可用：
-           for (int i = nArgs - 1; i >= 0; i--) {
-               calleeLVS.setVariable(i, operandStack.pop());
         }
-         */
 
-        MethodContext ctx = new MethodContext("subroutine@" + targetAddr, null);
+        StackFrame newFrame = new StackFrame(currentPC + 1, calleeLVS,
-        StackFrame newFrame = new StackFrame(currentPC + 1, calleeLVS, ctx);
+                new MethodContext("subroutine@" + targetAddr, null));
         callStack.pushFrame(newFrame);
 
         System.out.println("Calling function at address: " + targetAddr);
-
+        return targetAddr;   // jump
-        /* ---------- 跳转 ---------- */
-        return targetAddr;
     }
 }

test

@@ -8,18 +8,19 @@ module: CommonTasks
         body:
             num1 = 1
             num2=2
-            return num1 + CommonTasks.test(3)
+            return num1 + CommonTasks.test(3,4)
         end body
     end function
 
     function:test
         parameter:
             declare num1:int
+            declare num2:int
         return_type:int
         body:
             declare result : int
-            declare num2: int =4
+            declare num3: int =4
-            result = num2 + num1
+            result = num1 + num2 +num3
             return result
         end body
     end function