diff options
Diffstat (limited to 'libguile/frames.h')
| -rw-r--r-- | libguile/frames.h | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/libguile/frames.h b/libguile/frames.h index 71d5b124d..9105311f1 100644 --- a/libguile/frames.h +++ b/libguile/frames.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2001, 2009, 2010, 2011 Free Software Foundation, Inc. +/* Copyright (C) 2001, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. * * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License @@ -100,6 +100,37 @@ struct scm_vm_frame /* + * RTL frames + */ + +/* The frame format for the new RTL programs is almost like that for the + stack-vm programs. They differ in their handling of MV returns, + however. For RTL, every call is an MV call: every call has an MVRA. + Unlike the stack-vm programs, the MVRA for RTL programs is computable + from the RA -- it's always one word (4 bytes) before the RA. + + Until we completely migrate to the RTL VM, we will also write the + MVRA to the stack. + + When an RTL program returns multiple values, it will shuffle them + down to start contiguously from slot 0, as for a tail call. This + means that when the caller goes to access them, there are 2 or 3 + empty words between the top of the caller stack and the bottom of the + values, corresponding to the frame that was just popped. +*/ + +#define SCM_FRAME_RTL_RETURN_ADDRESS(fp) \ + ((scm_t_uint32 *) SCM_FRAME_RETURN_ADDRESS (fp)) +#define SCM_FRAME_SET_RTL_RETURN_ADDRESS(fp, ip) \ + SCM_FRAME_SET_RETURN_ADDRESS (fp, (scm_t_uint8 *) (ip)) + +#define SCM_FRAME_RTL_MV_RETURN_ADDRESS(fp) \ + ((scm_t_uint32 *) SCM_FRAME_MV_RETURN_ADDRESS (fp)) +#define SCM_FRAME_SET_RTL_MV_RETURN_ADDRESS(fp, ip) \ + SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, (scm_t_uint8 *) (ip)) + + +/* * Heap frames */ |