auto merge of #6046 : brson/rust/io, r=graydon

r? @pcwalton

Sorry this is so big, and sorry the first commit is just titled 'wip'.

Some interesting bits

* [LocalServices](https://github.com/brson/rust/commit/f9069baa70ea78117f2087fe6e359fb2ea0ae16a) - This is the set of runtime capabilities that *all* Rust code should expect access to, including the local heap, GC, logging, unwinding.
* [impl Reader, etc. for Option](https://github.com/brson/rust/commit/5fbb0949a53a6ac51c6d9b187ef4c464e52ae536) - Constructors like `File::open` return Option<FileStream>. This lets you write I/O code without ever unwrapping an option.

This series adds a lot of [documentation](https://github.com/brson/rust/blob/io/src/libcore/rt/io/mod.rs#L11) to `core::rt::io`.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index ee025a39ff4..8b7b89680fc 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -856,6 +856,63 @@ rust_initialize_global_state() {
     }
 }
 
+extern "C" CDECL memory_region*
+rust_new_memory_region(uintptr_t synchronized,
+                       uintptr_t detailed_leaks,
+                       uintptr_t poison_on_free) {
+    return new memory_region((bool)synchronized,
+                             (bool)detailed_leaks,
+                             (bool)poison_on_free);
+}
+
+extern "C" CDECL void
+rust_delete_memory_region(memory_region *region) {
+    delete region;
+}
+
+extern "C" CDECL boxed_region*
+rust_new_boxed_region(memory_region *region,
+                      uintptr_t poison_on_free) {
+    return new boxed_region(region, poison_on_free);
+}
+
+extern "C" CDECL void
+rust_delete_boxed_region(boxed_region *region) {
+    delete region;
+}
+
+extern "C" CDECL rust_opaque_box*
+rust_boxed_region_malloc(boxed_region *region, type_desc *td, size_t size) {
+    return region->malloc(td, size);
+}
+
+extern "C" CDECL void
+rust_boxed_region_free(boxed_region *region, rust_opaque_box *box) {
+    region->free(box);
+}
+
+typedef void *(rust_try_fn)(void*, void*);
+
+extern "C" CDECL uintptr_t
+rust_try(rust_try_fn f, void *fptr, void *env) {
+    try {
+        f(fptr, env);
+    } catch (uintptr_t token) {
+        assert(token != 0);
+        return token;
+    }
+    return 0;
+}
+
+extern "C" CDECL void
+rust_begin_unwind(uintptr_t token) {
+#ifndef __WIN32__
+    throw token;
+#else
+    abort();
+#endif
+}
+
 //
 // Local Variables:
 // mode: C++