1 files changed, 76 insertions, 0 deletions
diff --git a/src/libstd/rt/stack.rs b/src/libstd/rt/stack.rs
new file mode 100644
index 00000000000..ec56e65931c
--- /dev/null
+++ b/src/libstd/rt/stack.rs
@@ -0,0 +1,76 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use container::Container;
+use ptr::Ptr;
+use vec;
+use ops::Drop;
+use libc::{c_uint, uintptr_t};
+
+pub struct StackSegment {
+    buf: ~[u8],
+    valgrind_id: c_uint
+}
+
+pub impl StackSegment {
+    fn new(size: uint) -> StackSegment {
+        unsafe {
+            // Crate a block of uninitialized values
+            let mut stack = vec::with_capacity(size);
+            vec::raw::set_len(&mut stack, size);
+
+            let mut stk = StackSegment {
+                buf: stack,
+                valgrind_id: 0
+            };
+
+            // XXX: Using the FFI to call a C macro. Slow
+            stk.valgrind_id = rust_valgrind_stack_register(stk.start(), stk.end());
+            return stk;
+        }
+    }
+
+    /// Point to the low end of the allocated stack
+    fn start(&self) -> *uint {
+      vec::raw::to_ptr(self.buf) as *uint
+    }
+
+    /// Point one word beyond the high end of the allocated stack
+    fn end(&self) -> *uint {
+        vec::raw::to_ptr(self.buf).offset(self.buf.len()) as *uint
+    }
+}
+
+impl Drop for StackSegment {
+    fn finalize(&self) {
+        unsafe {
+            // XXX: Using the FFI to call a C macro. Slow
+            rust_valgrind_stack_deregister(self.valgrind_id);
+        }
+    }
+}
+
+pub struct StackPool(());
+
+impl StackPool {
+    pub fn new() -> StackPool { StackPool(()) }
+
+    fn take_segment(&self, min_size: uint) -> StackSegment {
+        StackSegment::new(min_size)
+    }
+
+    fn give_segment(&self, _stack: StackSegment) {
+    }
+}
+
+extern {
+    fn rust_valgrind_stack_register(start: *uintptr_t, end: *uintptr_t) -> c_uint;
+    fn rust_valgrind_stack_deregister(id: c_uint);
+}