changetype builtin; some namespace parsing; more stdlib ideas; compiler options for asc

std/impl/heap.ts

@@ -0,0 +1,38 @@
+/// <reference path="../../assembly.d.ts" />
+
+const ALIGN_LOG2: usize = 3;
+const ALIGN_SIZE: usize = 1 << ALIGN_LOG2;
+const ALIGN_MASK: usize = ALIGN_SIZE - 1;
+
+let HEAP_OFFSET: usize = HEAP_START; // HEAP_START is a constant generated by the compiler
+
+@global()
+@struct()
+class Heap {
+
+  static allocate(size: usize): usize {
+    const ptr: usize = HEAP_OFFSET;
+    assert(ptr + size <= (<usize>current_memory() << 16));
+    if (((HEAP_OFFSET += size) & ALIGN_MASK) != 0) // align next offset
+      HEAP_OFFSET = (HEAP_OFFSET | ALIGN_MASK) + 1;
+    return ptr;
+  }
+
+  static dispose(ptr: usize): void {
+    // just a big chunk of non-disposable memory for now
+  }
+
+  static get used(): usize {
+    return HEAP_OFFSET - HEAP_START;
+  }
+
+  static get free(): usize {
+    return (<usize>current_memory() << 16) - HEAP_OFFSET;
+  }
+
+  static get size(): usize {
+    return (<usize>current_memory() << 16) - HEAP_START;
+  }
+
+  private constructor() {}
+}