From 21eff156a3094c82ad85f8d3658fc1ac79c63da1 Mon Sep 17 00:00:00 2001
From: mryouse
Date: Sat, 27 May 2023 01:08:47 +0000
Subject: multiplication

---
 chunk.d    |  1 +
 compiler.d | 18 ++++++++++++++++++
 dbg.d      |  6 ++++--
 vm.d       |  7 +++++++
 4 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/chunk.d b/chunk.d
index 18bf12d..02d2a69 100644
--- a/chunk.d
+++ b/chunk.d
@@ -187,6 +187,7 @@ enum OpCode {
     OP_POPB,
     OP_POP_SCOPE,
     OP_SUBTRACT,
+    OP_MULTIPLY,
     OP_NIL,
 
     OP_JUMP,
diff --git a/compiler.d b/compiler.d
index d55b7f5..f94aad3 100644
--- a/compiler.d
+++ b/compiler.d
@@ -240,6 +240,21 @@ class Compiler {
         return ValueType.NUMBER;
     }
 
+    void compileMultiply(Form[] args) {
+        if (args.length < 2) {
+            this.error(format("'*': expected [2+] arguments, received %d", args.length), -1);
+            this.advance();
+            return;
+        }
+        ValueType vt = this.resolve(args[0], ValueType.NUMBER);
+        this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_NUMBER, args[0].line);
+        for (int i = 1; i < args.length; i++) {
+            vt = this.resolve(args[i], ValueType.NUMBER);
+            this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_NUMBER, args[i].line);
+            this.func.chunk.writeOp(OpCode.OP_MULTIPLY, args[i].line);
+        }
+    }
+
     //ValueType compileLess(Form[] args, ValueType expected = ValueType.ANY) {
     ValueType compileLess(Form[] args, ValueType expected) {
         if (args.length != 2) {
@@ -833,6 +848,9 @@ class Compiler {
                     return this.compileSubtract(cons.tail, ValueType.NUMBER);
                 }
                 break;
+            case "*":
+                this.compileMultiply(cons.tail);
+                break;
 
             // BOOLEAN
             case "<":
diff --git a/dbg.d b/dbg.d
index b9aad21..6958a05 100644
--- a/dbg.d
+++ b/dbg.d
@@ -8,8 +8,8 @@ import parser;
 //import dbg;
 //import value;
 
-bool DEBUG = true;
-//bool DEBUG = false;
+//bool DEBUG = true;
+bool DEBUG = false;
 
 
 void printForm(Form f, string prefix = "") {
@@ -177,6 +177,8 @@ int disassemble(Chunk chunk, int offset) {
             return listInstruction("OP_LIST", chunk, offset);
         case OpCode.OP_ADD:
             return simpleInstruction("OP_ADD", offset);
+        case OpCode.OP_MULTIPLY:
+            return simpleInstruction("OP_MULTIPLY", offset);
         case OpCode.OP_LESS:
             return simpleInstruction("OP_LESS", offset);
         case OpCode.OP_GREATER:
diff --git a/vm.d b/vm.d
index ba7fc50..a865a50 100644
--- a/vm.d
+++ b/vm.d
@@ -500,6 +500,13 @@ class VM {
                     double anum = asNumber(a);
                     this.pushA(makeNumberValue(anum - bnum));
                     break;
+                case OpCode.OP_MULTIPLY:
+                    Value b = this.popA();
+                    Value a = this.popA();
+                    double bnum = asNumber(b);
+                    double anum = asNumber(a);
+                    this.pushA(makeNumberValue(anum * bnum));
+                    break;
                 case OpCode.OP_NOT:
                     Value val = this.popA();
                     bool bval = asBoolean(val);
-- 
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