From cf62b54028ef949298fc38a815f5f0a3e1666261 Mon Sep 17 00:00:00 2001
From: Roy Frostig <rfrostig@mozilla.com>
Date: Mon, 6 Sep 2010 23:24:01 -0700
Subject: Add a little pointer-cast helper to dbg.

---
 src/lib/dbg.rs          |  5 +++++
 src/rt/rust_builtin.cpp | 13 +++++++++++++
 2 files changed, 18 insertions(+)

(limited to 'src')

diff --git a/src/lib/dbg.rs b/src/lib/dbg.rs
index 11c0086c..0ea8bd08 100644
--- a/src/lib/dbg.rs
+++ b/src/lib/dbg.rs
@@ -14,6 +14,7 @@ native "rust" mod rustrt {
   fn debug_tag[T](&T x);
   fn debug_obj[T](&T x, uint nmethods, uint nbytes);
   fn debug_fn[T](&T x);
+  fn debug_ptrcast[T, U](@T x) -> @U;
 }
 
 fn debug_vec[T](vec[T] v) {
@@ -52,3 +53,7 @@ fn debug_obj[T](&T x, uint nmethods, uint nbytes) {
 fn debug_fn[T](&T x) {
   rustrt.debug_fn[T](x);
 }
+
+fn ptr_cast[T, U](@T x) -> @U {
+  ret rustrt.debug_ptrcast[T, U](x);
+}
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index e8bc9fc7..8654e050 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -340,6 +340,19 @@ debug_fn(rust_task *task, type_desc *t, rust_fn *fn)
     task->log(rust_log::STDLIB, "  closure at 0x%" PRIxPTR, fn->closure);
 }
 
+extern "C" CDECL void *
+debug_ptrcast(rust_task *task,
+              type_desc *from_ty,
+              type_desc *to_ty,
+              void *ptr)
+{
+    task->log(rust_log::STDLIB, "debug_ptrcast from");
+    debug_tydesc_helper(task, from_ty);
+    task->log(rust_log::STDLIB, "to");
+    debug_tydesc_helper(task, to_ty);
+    return ptr;
+}
+
 
 //
 // Local Variables:
-- 
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