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4938d3cb74
Conflicts: GUILE-VERSION libguile/deprecated.c libguile/gc-malloc.c module/language/tree-il/peval.scm
150 lines
5.1 KiB
C
150 lines
5.1 KiB
C
/* Copyright (C) 2001, 2009, 2010, 2011 Free Software Foundation, Inc.
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* *
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef _SCM_FRAMES_H_
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#define _SCM_FRAMES_H_
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#include <libguile.h>
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#include "programs.h"
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/*
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* VM frames
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*/
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/*
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* It's a little confusing, but there are two representations of frames in this
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* file: frame pointers and Scheme objects wrapping those frame pointers. The
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* former uses the SCM_FRAME_... macro prefix, the latter SCM_VM_FRAME_..
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* prefix.
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*
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* The confusing thing is that only Scheme frame objects have functions that use
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* them, and they use the scm_frame_.. prefix. Hysterical raisins.
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*/
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/* VM Frame Layout
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---------------
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| ... |
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| Intermed. val. 0 | <- fp + nargs + nlocs
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+------------------+
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| Local variable 1 |
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| Local variable 0 | <- fp + nargs
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| Argument 1 |
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| Argument 0 | <- fp = SCM_FRAME_STACK_ADDRESS (fp)
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| Program | <- fp - 1
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+==================+
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| Return address | <- SCM_FRAME_UPPER_ADDRESS (fp)
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| MV return address|
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| Dynamic link | <- fp - 4 = SCM_FRAME_DATA_ADDRESS (fp) = SCM_FRAME_LOWER_ADDRESS (fp)
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+==================+
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| |
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As can be inferred from this drawing, it is assumed that
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`sizeof (SCM *) == sizeof (SCM)', since pointers (the `link' parts) are
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assumed to be as long as SCM objects. */
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/* This structure maps to the contents of a VM stack frame. It can
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alias a frame directly. */
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struct scm_vm_frame
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{
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SCM *dynamic_link;
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scm_t_uint8 *mv_return_address;
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scm_t_uint8 *return_address;
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SCM program;
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SCM stack[1]; /* Variable-length */
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};
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#define SCM_FRAME_STRUCT(fp) ((struct scm_vm_frame*)(((SCM*)(fp)) - 4))
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#define SCM_FRAME_DATA_ADDRESS(fp) (fp - 4)
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#define SCM_FRAME_STACK_ADDRESS(fp) (SCM_FRAME_STRUCT (fp)->stack)
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#define SCM_FRAME_UPPER_ADDRESS(fp) ((SCM*)&SCM_FRAME_STRUCT (fp)->return_address)
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#define SCM_FRAME_LOWER_ADDRESS(fp) ((SCM*)SCM_FRAME_STRUCT (fp))
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#define SCM_FRAME_BYTE_CAST(x) ((scm_t_uint8 *) SCM_UNPACK (x))
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#define SCM_FRAME_STACK_CAST(x) ((SCM *) SCM_UNPACK (x))
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#define SCM_FRAME_RETURN_ADDRESS(fp) \
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(SCM_FRAME_STRUCT (fp)->return_address)
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#define SCM_FRAME_SET_RETURN_ADDRESS(fp, ra) \
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SCM_FRAME_STRUCT (fp)->return_address = (ra)
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#define SCM_FRAME_MV_RETURN_ADDRESS(fp) \
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(SCM_FRAME_STRUCT (fp)->mv_return_address)
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#define SCM_FRAME_SET_MV_RETURN_ADDRESS(fp, mvra) \
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SCM_FRAME_STRUCT (fp)->mv_return_address = (mvra)
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#define SCM_FRAME_DYNAMIC_LINK(fp) \
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(SCM_FRAME_STRUCT (fp)->dynamic_link)
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#define SCM_FRAME_SET_DYNAMIC_LINK(fp, dl) \
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SCM_FRAME_STRUCT (fp)->dynamic_link = (dl)
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#define SCM_FRAME_VARIABLE(fp,i) \
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(SCM_FRAME_STRUCT (fp)->stack[i])
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#define SCM_FRAME_PROGRAM(fp) \
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(SCM_FRAME_STRUCT (fp)->program)
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/*
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* Heap frames
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*/
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struct scm_frame
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{
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SCM stack_holder;
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SCM *fp;
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SCM *sp;
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scm_t_uint8 *ip;
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scm_t_ptrdiff offset;
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};
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#define SCM_VM_FRAME_P(x) (SCM_HAS_TYP7 (x, scm_tc7_frame))
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#define SCM_VM_FRAME_DATA(x) ((struct scm_frame*)SCM_CELL_WORD_1 (x))
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#define SCM_VM_FRAME_STACK_HOLDER(f) SCM_VM_FRAME_DATA(f)->stack_holder
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#define SCM_VM_FRAME_FP(f) SCM_VM_FRAME_DATA(f)->fp
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#define SCM_VM_FRAME_SP(f) SCM_VM_FRAME_DATA(f)->sp
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#define SCM_VM_FRAME_IP(f) SCM_VM_FRAME_DATA(f)->ip
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#define SCM_VM_FRAME_OFFSET(f) SCM_VM_FRAME_DATA(f)->offset
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#define SCM_VALIDATE_VM_FRAME(p,x) SCM_MAKE_VALIDATE (p, x, VM_FRAME_P)
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SCM_API SCM scm_c_make_frame (SCM stack_holder, SCM *fp, SCM *sp,
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scm_t_uint8 *ip, scm_t_ptrdiff offset);
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SCM_API SCM scm_frame_p (SCM obj);
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SCM_API SCM scm_frame_procedure (SCM frame);
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SCM_API SCM scm_frame_arguments (SCM frame);
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SCM_API SCM scm_frame_source (SCM frame);
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SCM_API SCM scm_frame_num_locals (SCM frame);
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SCM_API SCM scm_frame_local_ref (SCM frame, SCM index);
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SCM_API SCM scm_frame_local_set_x (SCM frame, SCM index, SCM val);
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SCM_API SCM scm_frame_address (SCM frame);
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SCM_API SCM scm_frame_stack_pointer (SCM frame);
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SCM_API SCM scm_frame_instruction_pointer (SCM frame);
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SCM_API SCM scm_frame_return_address (SCM frame);
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SCM_API SCM scm_frame_mv_return_address (SCM frame);
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SCM_API SCM scm_frame_dynamic_link (SCM frame);
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SCM_API SCM scm_frame_previous (SCM frame);
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SCM_INTERNAL void scm_i_frame_print (SCM frame, SCM port,
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scm_print_state *pstate);
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SCM_INTERNAL void scm_init_frames (void);
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#endif /* _SCM_FRAMES_H_ */
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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