1 files changed, 69 insertions, 0 deletions
diff --git a/shell/int-stack.mu b/shell/int-stack.mu
new file mode 100644
index 00000000..a3ffa6eb
--- /dev/null
+++ b/shell/int-stack.mu
@@ -0,0 +1,69 @@
+type int-stack {
+  data: (handle array int)
+  top: int
+}
+
+fn initialize-int-stack _self: (addr int-stack), n: int {
+  var self/esi: (addr int-stack) <- copy _self
+  var d/edi: (addr handle array int) <- get self, data
+  populate d, n
+  var top/eax: (addr int) <- get self, top
+  copy-to *top, 0
+}
+
+fn push-int-stack _self: (addr int-stack), _val: int {
+  var self/esi: (addr int-stack) <- copy _self
+  var top-addr/ecx: (addr int) <- get self, top
+  var data-ah/edx: (addr handle array int) <- get self, data
+  var data/eax: (addr array int) <- lookup *data-ah
+  var top/edx: int <- copy *top-addr
+  var dest-addr/edx: (addr int) <- index data, top
+  var val/eax: int <- copy _val
+  copy-to *dest-addr, val
+  add-to *top-addr, 1
+}
+
+fn pop-int-stack _self: (addr int-stack) -> _/eax: int {
+  var self/esi: (addr int-stack) <- copy _self
+  var top-addr/ecx: (addr int) <- get self, top
+  {
+    compare *top-addr, 0
+    break-if->
+    return 0
+  }
+  subtract-from *top-addr, 1
+  var data-ah/edx: (addr handle array int) <- get self, data
+  var data/eax: (addr array int) <- lookup *data-ah
+  var top/edx: int <- copy *top-addr
+  var result-addr/eax: (addr int) <- index data, top
+  var val/eax: int <- copy *result-addr
+  return val
+}
+
+fn int-stack-empty? _self: (addr int-stack) -> _/eax: boolean {
+  var self/esi: (addr int-stack) <- copy _self
+  var top-addr/ecx: (addr int) <- get self, top
+  compare *top-addr, 0
+  {
+    break-if-=
+    return 0/false
+  }
+  return 1/true
+}
+
+fn int-stack-top _self: (addr int-stack) -> _/eax: int {
+  var self/esi: (addr int-stack) <- copy _self
+  var top-addr/ecx: (addr int) <- get self, top
+  var top/ecx: int <- copy *top-addr
+  {
+    compare top, 0
+    break-if->
+    return 0
+  }
+  top <- decrement
+  var data-ah/edx: (addr handle array int) <- get self, data
+  var data/eax: (addr array int) <- lookup *data-ah
+  var result-addr/eax: (addr int) <- index data, top
+  var val/eax: int <- copy *result-addr
+  return val
+}