From 14b6a2ddd2b621ba9bee4589af807e160ade4afd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jose=20Luis=20Monta=C3=B1es=20Ojados?= <joseluis@zubi.group>
Date: Mon, 16 Feb 2026 02:24:37 +0100
Subject: [PATCH] Add * and / operators, VM step debugger, and visualizer
 tweaks

Support multiply and divide in lexer, parser and eval.
Add step-by-step VM debug output with AST and heap visualization.
Remove spacing in visualizer hex output.
---
 projects/resta.j       |  5 +++++
 src/frontend/lexer.h   |  6 ++++++
 src/frontend/parser.h  |  4 ++--
 src/memory/allocator.h | 12 +++++++-----
 src/vm/eval.h          | 15 ++++++++++++++-
 5 files changed, 34 insertions(+), 8 deletions(-)
 create mode 100644 projects/resta.j

diff --git a/projects/resta.j b/projects/resta.j
new file mode 100644
index 0000000..8d6baca
--- /dev/null
+++ b/projects/resta.j
@@ -0,0 +1,5 @@
+x=2
+y=5
+z = x + y
+zz = z * x
+print zz
\ No newline at end of file
diff --git a/src/frontend/lexer.h b/src/frontend/lexer.h
index 3ffc9fe..9c06998 100644
--- a/src/frontend/lexer.h
+++ b/src/frontend/lexer.h
@@ -81,6 +81,12 @@ Token *tokenize(const char *source, int *token_count) {
     } else if (c == '-') {
       tokens[count++] = make_token(TOK_MINUS, "-");
       pos++;
+    } else if (c == '*') {
+      tokens[count++] = make_token(TOK_STAR, "*");
+      pos++;
+    } else if (c == '/') {
+      tokens[count++] = make_token(TOK_SLASH, "/");
+      pos++;
     } else if (c == '=') {
       tokens[count++] = make_token(TOK_ASSIGN, "=");
       pos++;
diff --git a/src/frontend/parser.h b/src/frontend/parser.h
index 26a48a8..ba25103 100644
--- a/src/frontend/parser.h
+++ b/src/frontend/parser.h
@@ -80,9 +80,9 @@ ASTNode *parse_expr(Token *tokens)
 {
     ASTNode *left = parse_term(tokens);
 
-    while (tokens[pos].type == TOK_PLUS || tokens[pos].type == TOK_MINUS)
+    while (tokens[pos].type == TOK_PLUS || tokens[pos].type == TOK_MINUS || tokens[pos].type == TOK_STAR || tokens[pos].type == TOK_SLASH)
     {
-        char op = tokens[pos].value[0]; // + o -
+        char op = tokens[pos].value[0]; // +,-,*,/
         pos++;
         ASTNode *right = parse_term(tokens);
 
diff --git a/src/memory/allocator.h b/src/memory/allocator.h
index 01dacd4..575f722 100644
--- a/src/memory/allocator.h
+++ b/src/memory/allocator.h
@@ -199,7 +199,8 @@ void JLANG_visualize(void *ptr) {
         }
       } else {
         // Mark all block as JLANG_NOT_USE
-        memset(byteMapPtr + blockIndex, JLANG_NOT_USE, sizeof(JLANG_metadata) + currentHeader->size);
+        memset(byteMapPtr + blockIndex, JLANG_NOT_USE,
+               sizeof(JLANG_metadata) + currentHeader->size);
       }
     } else {
       break;
@@ -215,7 +216,6 @@ void JLANG_visualize(void *ptr) {
 
   int bytePerRow = 40;
   int totalRows = _ceil(allocPtr->size / bytePerRow);
-  printf("totalRows=%d\n", totalRows);
 
   char *currentMemPtr = allocPtr->memory;
 
@@ -242,9 +242,11 @@ void JLANG_visualize(void *ptr) {
 
       printf("%.2x", (unsigned char)*(currentMemPtr + (n + i * bytePerRow)));
 
-      if (n < bytePerRow - 1) {
-        printf(" ");
-      }
+      /*
+        if (n < bytePerRow - 1) {
+          printf(" ");
+        }
+      */
 
       printf("\033[0m");
     }
diff --git a/src/vm/eval.h b/src/vm/eval.h
index fffdb3c..dfca63b 100644
--- a/src/vm/eval.h
+++ b/src/vm/eval.h
@@ -44,7 +44,16 @@ void env_set(Environment *env, const char *name, size_t value)
     env->count++;
 }
 
+int step = 0;
+
 size_t eval(ASTNode *node, Environment *env, void *allocator) {
+    step++;
+    printf("===== VM Step: %d =====\n", step);
+    printf("executing node:\n");
+    ast_debug(node);
+    printf("\n");
+    JLANG_visualize(allocator);
+
     switch (node->type) {
         case NODE_INT_LIT:
             return obj_new_int(allocator, node->data.int_val);
@@ -68,7 +77,11 @@ size_t eval(ASTNode *node, Environment *env, void *allocator) {
                 return obj_new_int(allocator, l->data.int_val + r->data.int_val);
             } else if (node->data.binop.op == '-') {
                 return obj_new_int(allocator, l->data.int_val - r->data.int_val);
-            }
+            } else if (node->data.binop.op == '*') {
+                return obj_new_int(allocator, l->data.int_val * r->data.int_val);
+            } else if (node->data.binop.op == '/') {
+                return obj_new_int(allocator, l->data.int_val / r->data.int_val);
+            } 
         }
         case NODE_PRINT: {
             size_t val = eval(node->data.print.expr, env, allocator);