added get_addr and jmp

stdlib/core.sl

@@ -1,3 +1,17 @@
+#get_addr [*] -> [* | addr]
+:asm get_addr {
+    mov rax, [rsp]
+    sub r12, 8
+    mov [r12], rax
+};
+
+#jmp [* | addr] -> [*]
+:asm jmp {
+    mov rax, [r12]
+    add r12, 8
+    jmp rax
+};
+
 # Reserve 64 bytes in .bss
 # persistent: resb 64
 # push the addr of it

tests/jmp_test.expected

@@ -0,0 +1,5 @@
+gg
+gg
+gg
+gg
+gg

tests/jmp_test.sl

@@ -0,0 +1,18 @@
+import stdlib.sl
+
+word main
+    5          # loop count
+    get_addr   # push loop target address (next instruction)
+    "gg" puts
+
+    swap       # bring count to top
+    1 -        # decrement
+    dup 0 > if
+        swap   # put addr on top
+        dup    # keep a copy for next iteration
+        jmp
+    else
+        drop   # drop count
+        drop   # drop addr
+    end
+end

tests/jmp_test.test

@@ -0,0 +1 @@
+python main.py tests/jmp_test.sl -o ./build/jmp_test > /dev/null && ./build/jmp_test