Add default allocator symbols

ctr-std/src/heap.rs

@@ -0,0 +1,165 @@
+// Copyright 2017 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.
+
+//! dox
+
+#![unstable(issue = "32838", feature = "allocator_api")]
+
+pub use alloc::heap::{Heap, Alloc, Layout, Excess, CannotReallocInPlace, AllocErr};
+#[cfg(not(stage0))]
+pub use alloc_system::System;
+
+#[cfg(all(not(stage0), not(test)))]
+#[doc(hidden)]
+pub mod __default_lib_allocator {
+    use super::{System, Layout, Alloc, AllocErr};
+    use ptr;
+
+    // for symbol names src/librustc/middle/allocator.rs
+    // for signatures src/librustc_allocator/lib.rs
+
+    // linkage directives are provided as part of the current compiler allocator
+    // ABI
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_alloc(size: usize,
+                                     align: usize,
+                                     err: *mut u8) -> *mut u8 {
+        let layout = Layout::from_size_align_unchecked(size, align);
+        match System.alloc(layout) {
+            Ok(p) => p,
+            Err(e) => {
+                ptr::write(err as *mut AllocErr, e);
+                0 as *mut u8
+            }
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_oom(err: *const u8) -> ! {
+        System.oom((*(err as *const AllocErr)).clone())
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_dealloc(ptr: *mut u8,
+                                       size: usize,
+                                       align: usize) {
+        System.dealloc(ptr, Layout::from_size_align_unchecked(size, align))
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_usable_size(layout: *const u8,
+                                           min: *mut usize,
+                                           max: *mut usize) {
+        let pair = System.usable_size(&*(layout as *const Layout));
+        *min = pair.0;
+        *max = pair.1;
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_realloc(ptr: *mut u8,
+                                       old_size: usize,
+                                       old_align: usize,
+                                       new_size: usize,
+                                       new_align: usize,
+                                       err: *mut u8) -> *mut u8 {
+        let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
+        let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
+        match System.realloc(ptr, old_layout, new_layout) {
+            Ok(p) => p,
+            Err(e) => {
+                ptr::write(err as *mut AllocErr, e);
+                0 as *mut u8
+            }
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_alloc_zeroed(size: usize,
+                                            align: usize,
+                                            err: *mut u8) -> *mut u8 {
+        let layout = Layout::from_size_align_unchecked(size, align);
+        match System.alloc_zeroed(layout) {
+            Ok(p) => p,
+            Err(e) => {
+                ptr::write(err as *mut AllocErr, e);
+                0 as *mut u8
+            }
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_alloc_excess(size: usize,
+                                            align: usize,
+                                            excess: *mut usize,
+                                            err: *mut u8) -> *mut u8 {
+        let layout = Layout::from_size_align_unchecked(size, align);
+        match System.alloc_excess(layout) {
+            Ok(p) => {
+                *excess = p.1;
+                p.0
+            }
+            Err(e) => {
+                ptr::write(err as *mut AllocErr, e);
+                0 as *mut u8
+            }
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_realloc_excess(ptr: *mut u8,
+                                              old_size: usize,
+                                              old_align: usize,
+                                              new_size: usize,
+                                              new_align: usize,
+                                              excess: *mut usize,
+                                              err: *mut u8) -> *mut u8 {
+        let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
+        let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
+        match System.realloc_excess(ptr, old_layout, new_layout) {
+            Ok(p) => {
+                *excess = p.1;
+                p.0
+            }
+            Err(e) => {
+                ptr::write(err as *mut AllocErr, e);
+                0 as *mut u8
+            }
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_grow_in_place(ptr: *mut u8,
+                                             old_size: usize,
+                                             old_align: usize,
+                                             new_size: usize,
+                                             new_align: usize) -> u8 {
+        let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
+        let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
+        match System.grow_in_place(ptr, old_layout, new_layout) {
+            Ok(()) => 1,
+            Err(_) => 0,
+        }
+    }
+
+    #[no_mangle]
+    pub unsafe extern fn __rdl_shrink_in_place(ptr: *mut u8,
+                                               old_size: usize,
+                                               old_align: usize,
+                                               new_size: usize,
+                                               new_align: usize) -> u8 {
+        let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
+        let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
+        match System.shrink_in_place(ptr, old_layout, new_layout) {
+            Ok(()) => 1,
+            Err(_) => 0,
+        }
+    }
+}

ctr-std/src/lib.rs

@@ -1,5 +1,6 @@
 #![feature(alloc)]
 #![feature(allocator_api)]
+#![feature(allocator_internals)]
 #![feature(alloc_system)]
 #![feature(allow_internal_unstable)]
 #![feature(box_syntax)]
@@ -46,7 +47,7 @@
 #![allow(non_camel_case_types, dead_code, unused_features)]
 #![no_std]
 
-
+#![cfg_attr(not(stage0), default_lib_allocator)]
 #![stable(feature = "rust1", since = "1.0.0")]
 
 #[prelude_import]
@@ -169,6 +170,7 @@ pub mod panic;
 pub mod path;
 pub mod sync;
 pub mod time;
+pub mod heap;
 
 // Platform-abstraction modules
 #[macro_use]