Add weak reference support for Tango 0.99.9

[software/dgc/cdgc.git] / gc / alloc.d

diff --git a/gc/alloc.d b/gc/alloc.d
index 55d0497a7296e541008e7c09bd0ca97f5733f7b9..eeebcf467769c8ac7b90eff0abfad5b734a47576 100644 (file)
--- a/gc/alloc.d
+++ b/gc/alloc.d
@@ -26,7 +26,9 @@
 
 module gc.alloc;
 
+
 // C OS-specific API
+
 private extern (C) {
     version (Win32) {
         alias void* POINTER;
@@ -79,159 +81,76 @@ private extern (C) {
     }
 }
 
-/+
-static if(is(typeof(VirtualAlloc)))
-    version = GC_Use_Alloc_Win32;
-else static if (is(typeof(mmap)))
-    version = GC_Use_Alloc_MMap;
-else static if (is(typeof(valloc)))
-    version = GC_Use_Alloc_Valloc;
-else static if (is(typeof(malloc)))
-    version = GC_Use_Alloc_Malloc;
-else static assert(false, "No supported allocation methods available.");
-+/
 
-static if (is(typeof(VirtualAlloc))) // version (GC_Use_Alloc_Win32)
+// Public interface
+
+version (D_Ddoc)
 {
     /**
      * Map memory.
      */
-    void *os_mem_map(size_t nbytes)
-    {
-        return VirtualAlloc(null, nbytes, MEM_RESERVE, PAGE_READWRITE);
-    }
-
-
-    /**
-     * Commit memory.
-     * Returns:
-     *      0       success
-     *      !=0     failure
-     */
-    int os_mem_commit(void *base, size_t offset, size_t nbytes)
-    {   void *p;
-
-        p = VirtualAlloc(base + offset, nbytes, MEM_COMMIT, PAGE_READWRITE);
-    return cast(int)(p is null);
-    }
-
-
-    /**
-     * Decommit memory.
-     * Returns:
-     *      0       success
-     *      !=0     failure
-     */
-    int os_mem_decommit(void *base, size_t offset, size_t nbytes)
-    {
-    return cast(int)(VirtualFree(base + offset, nbytes, MEM_DECOMMIT) == 0);
-    }
-
+    void* os_mem_map(size_t nbytes);
 
     /**
      * Unmap memory allocated with os_mem_map().
-     * Memory must have already been decommitted.
      * Returns:
-     *      0       success
-     *      !=0     failure
+     *      true  success
+     *      false failure
      */
-    int os_mem_unmap(void *base, size_t nbytes)
-    {
-        return cast(int)(VirtualFree(base, 0, MEM_RELEASE) == 0);
-    }
+    bool os_mem_unmap(void* base, size_t nbytes);
 }
-else static if (is(typeof(mmap)))  // else version (GC_Use_Alloc_MMap)
+// Implementations
+else static if (is(typeof(VirtualAlloc)))
 {
-    void *os_mem_map(size_t nbytes)
-    {   void *p;
-
-        p = mmap(null, nbytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
-        return (p == MAP_FAILED) ? null : p;
-    }
-
-
-    int os_mem_commit(void *base, size_t offset, size_t nbytes)
+    void* os_mem_map(size_t nbytes)
     {
-        return 0;
+        return VirtualAlloc(null, nbytes, MEM_RESERVE | MEM_COMMIT,
+                PAGE_READWRITE);
     }
 
-
-    int os_mem_decommit(void *base, size_t offset, size_t nbytes)
+    bool os_mem_unmap(void* base, size_t nbytes)
     {
-        return 0;
-    }
-
-
-    int os_mem_unmap(void *base, size_t nbytes)
-    {
-        return munmap(base, nbytes);
+        return VirtualFree(base, 0, MEM_RELEASE) != 0;
     }
 }
-else static if (is(typeof(valloc))) // else version (GC_Use_Alloc_Valloc)
+else static if (is(typeof(mmap)) && is(typeof(MAP_ANON)))
 {
-    void *os_mem_map(size_t nbytes)
-    {
-        return valloc(nbytes);
-    }
-
-
-    int os_mem_commit(void *base, size_t offset, size_t nbytes)
+    void* os_mem_map(size_t nbytes)
     {
-        return 0;
-    }
-
-
-    int os_mem_decommit(void *base, size_t offset, size_t nbytes)
-    {
-        return 0;
+        void* p = mmap(null, nbytes,
+                PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+        return (p == MAP_FAILED) ? null : p;
     }
 
-
-    int os_mem_unmap(void *base, size_t nbytes)
+    bool os_mem_unmap(void* base, size_t nbytes)
     {
-        free(base);
-        return 0;
+        return munmap(base, nbytes) == 0;
     }
 }
-else static if (is(typeof(malloc))) // else version (GC_Use_Alloc_Malloc)
+else static if (is(typeof(malloc)))
 {
     // NOTE: This assumes malloc granularity is at least (void*).sizeof.  If
     //       (req_size + PAGESIZE) is allocated, and the pointer is rounded up
     //       to PAGESIZE alignment, there will be space for a void* at the end
     //       after PAGESIZE bytes used by the GC.
 
-
     import gcx; // for PAGESIZE
 
-
     const size_t PAGE_MASK = PAGESIZE - 1;
 
-
-    void *os_mem_map(size_t nbytes)
-    {   byte *p, q;
-        p = cast(byte *) malloc(nbytes + PAGESIZE);
+    void* os_mem_map(size_t nbytes)
+    {
+        byte* p, q;
+        p = cast(byte* ) malloc(nbytes + PAGESIZE);
         q = p + ((PAGESIZE - ((cast(size_t) p & PAGE_MASK))) & PAGE_MASK);
-        * cast(void**)(q + nbytes) = p;
+        *cast(void**)(q + nbytes) = p;
         return q;
     }
 
-
-    int os_mem_commit(void *base, size_t offset, size_t nbytes)
-    {
-        return 0;
-    }
-
-
-    int os_mem_decommit(void *base, size_t offset, size_t nbytes)
-    {
-        return 0;
-    }
-
-
-    int os_mem_unmap(void *base, size_t nbytes)
+    bool os_mem_unmap(void* base, size_t nbytes)
     {
-        free( *cast(void**)( cast(byte*) base + nbytes ) );
-        return 0;
+        free(*cast(void**)(cast(byte*) base + nbytes));
+        return true;
     }
 }
 else