add string example

src/arch/linux/main.c

@@ -10,9 +10,17 @@ int main(int argc, char **argv) {
   vm.stack_size = STACK_SIZE;
   vm.memory_size = MEMORY_SIZE;
 
-  uint32_t end = test_loop_compile(vm.memory);
+  uint32_t end = 0;
+
+  /* test_add_compile(vm.memory); */
   /* test_add_function_compile(vm.memory); */
+  /* test_loop_compile(vm.memory); */
+  test_hello_world_compile(vm.memory);
   /* test_recursive_function_compile(vm.memory); */
+  while (step_vm(&vm));
+  core_dump(&vm);
+  return 0;
+
   uint32_t buffer_size = 640 * 480 * sizeof(uint32_t);
 
   Device screen;
@@ -25,9 +33,10 @@ int main(int argc, char **argv) {
   vm.mp += buffer_size;
 
   /* Create window and renderer */
-  SDL_Window *window = SDL_CreateWindow(
-      "Reality Engine VM", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-      screen.s.width, screen.s.height, SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
+  SDL_Window *window =
+      SDL_CreateWindow("Reality Engine VM", SDL_WINDOWPOS_CENTERED,
+                       SDL_WINDOWPOS_CENTERED, screen.s.width, screen.s.height,
+                       SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
 
   SDL_Renderer *renderer = SDL_CreateRenderer(
       window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
@@ -40,25 +49,28 @@ int main(int argc, char **argv) {
   /* Enable nearest-neighbor scaling (preserves pixel art) */
   SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "0"); /* "0" = nearest-neighbor */
 
-  while (step_vm(&vm)) {
+  bool running = true;
+  while (running) {
+    step_vm(&vm);
     SDL_Event event;
     while (SDL_PollEvent(&event)) {
       switch (event.type) {
       case SDL_QUIT:
-          return 0;
+	running = false;
       case SDL_MOUSEBUTTONDOWN:
-        /* event.button.x, event.button.y, event.button.button */
+        printf("mouse_down: x=%d, y=%d, btn=%d\n", event.button.x,
+               event.button.y, event.button.button);
         break;
       case SDL_MOUSEMOTION:
-        /* handleInput(event.motion.x, event.motion.y, 0);  0 for no button */
+        printf("mouse_move: x=%d, y=%d\n", event.motion.x, event.motion.y);
         break;
       case SDL_FINGERDOWN:
-        /* handleInput(event.tfinger.x * screen.s.width, */
-                    /* event.tfinger.y * screen.s.height, 1); // 1 for touch */
+        printf("touch_down x=%f, y=%f\n", event.tfinger.x * screen.s.width,
+               event.tfinger.y * screen.s.height);
         break;
       case SDL_FINGERMOTION:
-        /* handleInput(event.tfinger.x * screen.s.width, */
-                    /* event.tfinger.y * screen.s.height, 0); // 0 for no button */
+        printf("touch_move x=%f, y=%f\n", event.tfinger.x * screen.s.width,
+               event.tfinger.y * screen.s.height);
         break;
       }
     }
@@ -68,7 +80,6 @@ int main(int argc, char **argv) {
 
     SDL_RenderClear(renderer);
 
-    /* Optional: Set logical size to maintain 640x480 aspect ratio */
     /* (Scales to fit screen while preserving pixel grid) */
     SDL_Rect output_rect;
     SDL_RenderGetViewport(renderer, &output_rect);
@@ -84,6 +95,5 @@ int main(int argc, char **argv) {
     SDL_RenderCopy(renderer, texture, NULL, &dstrect);
     SDL_RenderPresent(renderer);
   }
-  core_dump(&vm);
   return 0;
 }

src/opcodes.h

@@ -15,6 +15,11 @@ typedef struct slice_s {
   uint32_t end;
 } Slice;
 
+typedef struct cell_s {
+  uint32_t car;
+  uint32_t cdr;
+} Cell;
+
 #define MAX_REGS 32
 typedef struct frame_s {
   Value registers[MAX_REGS]; /* R0-R31 */

src/test.c

@@ -1,5 +1,27 @@
 #include "test.h"
 
+uint32_t test_hello_world_compile(Value *memory) {
+  uint32_t i = 0;
+  memory[i++].u = OP(OP_LOADU, 1, 0, 0);
+  memory[i++].u = 4;
+  memory[i++].u = OP(OP_PRINT_STRING, 0, 1, 0); /* print("nuqneH 'u'?"); */
+  memory[i++].u = OP(OP_HALT, 0, 0, 0); /* explicit halt */
+  memory[i++].u = 12;
+  memory[i].c[0] = 'n';
+  memory[i].c[1] = 'u';
+  memory[i].c[2] = 'q';
+  memory[i++].c[3] = 'n';
+  memory[i].c[0] = 'e';
+  memory[i].c[1] = 'H';
+  memory[i].c[2] = ' ';
+  memory[i++].c[3] = '\'';
+  memory[i].c[0] = 'u';
+  memory[i].c[1] = '\'';
+  memory[i].c[2] = '?';
+  memory[i++].c[3] = '\0';
+  return i;
+}
+
 uint32_t test_add_compile(Value *memory) {
   uint32_t i = 0;
   memory[i++].u = OP(OP_LOADU, 0, 0, 0);
@@ -18,7 +40,7 @@ uint32_t test_loop_compile(Value *memory) {
   memory[i++].u = OP(OP_LOADF, 0, 0, 0); /* let a = 5.0 */
   memory[i++].f = 5.0f;
   memory[i++].u = OP(OP_LOADI, 1, 0, 0); /* do (i = 5, 0, -1) { */
-  memory[i++].i = 5;
+  memory[i++].i = 5000;
   memory[i++].u = OP(OP_LOADI, 2, 0, 0); /* loop check value */
   memory[i++].i = 0;
   memory[i++].u = OP(OP_LOADI, 3, 0, 0); /* loop incriment value */

src/test.h

@@ -3,6 +3,7 @@
 
 #include "opcodes.h"
 
+uint32_t test_hello_world_compile (Value *memory);
 uint32_t test_add_compile (Value *memory);
 uint32_t test_loop_compile (Value *memory);
 uint32_t test_add_function_compile(Value *memory);