1 files changed, 74 insertions, 0 deletions
diff --git a/rts/sm/Compact.h b/rts/sm/Compact.h
new file mode 100644
index 0000000000..4f1d6a27c7
--- /dev/null
+++ b/rts/sm/Compact.h
@@ -0,0 +1,74 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team 1998-2005
+ *
+ * Compacting garbage collector
+ *
+ * ---------------------------------------------------------------------------*/
+
+#ifndef GCCOMPACT_H
+#define GCCOMPACT_H
+
+INLINE_HEADER rtsBool
+mark_stack_empty(void)
+{
+    return mark_sp == mark_stack;
+}
+
+INLINE_HEADER rtsBool
+mark_stack_full(void)
+{
+    return mark_sp >= mark_splim;
+}
+
+INLINE_HEADER void
+reset_mark_stack(void)
+{
+    mark_sp = mark_stack;
+}
+
+INLINE_HEADER void
+push_mark_stack(StgPtr p)
+{
+    *mark_sp++ = p;
+}
+
+INLINE_HEADER StgPtr
+pop_mark_stack(void)
+{
+    return *--mark_sp;
+}
+
+INLINE_HEADER void 
+mark(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    *bitmap_word |= bit_mask;
+}
+
+INLINE_HEADER void 
+unmark(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    *bitmap_word &= ~bit_mask;
+}
+
+INLINE_HEADER StgWord
+is_marked(StgPtr p, bdescr *bd)
+{
+    nat offset_within_block = p - bd->start; // in words
+    StgPtr bitmap_word = (StgPtr)bd->u.bitmap + 
+	(offset_within_block / (sizeof(W_)*BITS_PER_BYTE));
+    StgWord bit_mask = (StgWord)1 << (offset_within_block & (sizeof(W_)*BITS_PER_BYTE - 1));
+    return (*bitmap_word & bit_mask);
+}
+
+void compact(void);
+
+#endif /* GCCOMPACT_H */