1 files changed, 138 insertions, 0 deletions
diff --git a/erts/emulator/hipe/hipe_x86_gc.h b/erts/emulator/hipe/hipe_x86_gc.h
new file mode 100644
index 0000000000..4f17f767df
--- /dev/null
+++ b/erts/emulator/hipe/hipe_x86_gc.h
@@ -0,0 +1,138 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2004-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+/* $Id$
+ * Stack walking helpers for native stack GC procedures.
+ */
+#ifndef HIPE_X86_GC_H
+#define HIPE_X86_GC_H
+
+#include "hipe_x86_asm.h"	/* for NR_ARG_REGS */
+
+/* uncomment to simulate & test what the initial PowerPC port will do */
+//#define SKIP_YOUNGEST_FRAME
+
+struct nstack_walk_state {
+#ifdef SKIP_YOUNGEST_FRAME
+    const struct sdesc *sdesc0;	/* .sdesc0 must be a pointer rvalue */
+#else
+    struct sdesc sdesc0[1];	/* .sdesc0 must be a pointer rvalue */
+#endif
+};
+
+static inline int nstack_walk_init_check(const Process *p)
+{
+#ifdef SKIP_YOUNGEST_FRAME
+    if (!p->hipe.nsp || p->hipe.nsp == p->hipe.nstend)
+	return 0;
+#endif
+    return 1;
+}
+
+static inline Eterm *nstack_walk_nsp_begin(const Process *p)
+{
+#ifdef SKIP_YOUNGEST_FRAME
+    unsigned int nstkarity = p->hipe.narity - NR_ARG_REGS;
+    if ((int)nstkarity < 0)
+	nstkarity = 0;
+    return p->hipe.nsp + 1 + nstkarity;
+#else
+    return p->hipe.nsp;
+#endif
+}
+
+static inline const struct sdesc*
+nstack_walk_init_sdesc(const Process *p, struct nstack_walk_state *state)
+{
+#ifdef SKIP_YOUNGEST_FRAME
+    const struct sdesc *sdesc = hipe_find_sdesc(p->hipe.nsp[0]);
+    state->sdesc0 = sdesc;
+    return sdesc;
+#else
+    unsigned int nstkarity = p->hipe.narity - NR_ARG_REGS;
+    if ((int)nstkarity < 0)
+	nstkarity = 0;
+    state->sdesc0[0].summary = (0 << 9) | (0 << 8) | nstkarity;
+    state->sdesc0[0].livebits[0] = 0;
+    /* XXX: this appears to prevent a gcc-4.1.1 bug on x86 */
+    __asm__ __volatile__("" : : "m"(*state) : "memory");
+    return &state->sdesc0[0];
+#endif
+}
+
+static inline void nstack_walk_update_trap(Process *p, const struct sdesc *sdesc0)
+{
+#ifdef SKIP_YOUNGEST_FRAME
+    Eterm *nsp = p->hipe.nsp;
+    p->hipe.nsp = nstack_walk_nsp_begin(p);
+    hipe_update_stack_trap(p, sdesc0);
+    p->hipe.nsp = nsp;
+#else
+    hipe_update_stack_trap(p, sdesc0);
+#endif
+}
+
+static inline Eterm *nstack_walk_nsp_end(const Process *p)
+{
+    return p->hipe.nstend;
+}
+
+static inline void nstack_walk_kill_trap(Process *p, Eterm *nsp_end)
+{
+    /* remove gray/white boundary trap */
+    for (;;) {
+	--nsp_end;
+	if (nsp_end[0] == (unsigned long)nbif_stack_trap_ra) {
+	    nsp_end[0] = (unsigned long)p->hipe.ngra;
+	    break;
+	}
+    }
+}
+
+static inline int nstack_walk_gray_passed_black(const Eterm *gray, const Eterm *black)
+{
+    return gray > black;
+}
+
+static inline int nstack_walk_nsp_reached_end(const Eterm *nsp, const Eterm *nsp_end)
+{
+    return nsp >= nsp_end;
+}
+
+static inline unsigned int nstack_walk_frame_size(const struct sdesc *sdesc)
+{
+    return sdesc_fsize(sdesc) + 1 + sdesc_arity(sdesc);
+}
+
+static inline Eterm *nstack_walk_frame_index(Eterm *nsp, unsigned int i)
+{
+    return &nsp[i];
+}
+
+static inline unsigned long
+nstack_walk_frame_ra(const Eterm *nsp, const struct sdesc *sdesc)
+{
+    return nsp[sdesc_fsize(sdesc)];
+}
+
+static inline Eterm *nstack_walk_next_frame(Eterm *nsp, unsigned int sdesc_size)
+{
+    return nsp + sdesc_size;
+}
+
+#endif /* HIPE_X86_GC_H */