[Issue 4681] Appender access violation

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4681



--- Comment #7 from David Simcha <dsimcha at yahoo.com> 2010-08-20 18:43:24 PDT ---
Comment from Shin Fujishiro the Phobos mailing list, reproduced here to make it
more public and permanent:

Seems like a bug of Appender.writeCapacity().  It often writes 'cap' to
wrong address; the following assertion fails:
==========
diff --git phobos/std/array.d phobos/std/array.d
index 6b62733..e6d3a62 100644
--- phobos/std/array.d
+++ phobos/std/array.d
@@ -736,10 +736,12 @@ private:
         auto p = cast(ubyte*) (pArray.ptr + pArray.length);
         if (cap < ubyte.max)
         {
+            assert(p + 1 <= GC.addrOf(pArray.ptr) + GC.sizeOf(pArray.ptr));
             *p = cast(ubyte) cap;
         }
         else if (cap < ushort.max)
         {
+            assert(p + 3 <= GC.addrOf(pArray.ptr) + GC.sizeOf(pArray.ptr));
             *p++ = ubyte.max;
             *p++ = cast(ubyte) cap;
             *p++ = cast(ubyte) (cap >> 8);
==========


Shin

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