ps5: function call

ps5/src/emit.h

@@ -45,6 +45,7 @@
 #define CQO EMIT("cqo");                 // Sign extend RAX -> RDX:RAX
 #define IDIVQ(by) EMIT("idivq %s", (by)) // Divide RDX:RAX by "by", store result in RAX
 
+#define CALL(func) EMIT("call .%s", (func))
 #define RET EMIT("ret")
 
 #define CMPQ(op1, op2) EMIT("cmpq %s, %s", (op1), (op2)) // Compare the two operands

ps5/src/generator.c

@@ -164,6 +164,18 @@ static void generate_function(symbol_t* function)
 static void generate_function_call(node_t* call)
 {
   // TODO (Task 4.3)
+  node_t *args = call->children[1];
+  for (int i = args->n_children - 1; i >= 0; i--) {
+    node_t *expr = args->children[i];
+    generate_expression(expr);
+    PUSHQ(RAX);
+  }
+  int spill = args->n_children > NUM_REGISTER_PARAMS
+            ? NUM_REGISTER_PARAMS : args->n_children;
+  for (int i = 0; i < spill; i++) {
+    POPQ(REGISTER_PARAMS[i]);
+  }
+  CALL(call->children[0]->symbol->name);
 }
 
 #define UNARY_OP(OP, INST) \
@@ -247,6 +259,7 @@ static void generate_expression(node_t* expression)
     }
     break;
   case FUNCTION_CALL:
+    generate_function_call(expression);
     break;
   }
 }