mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 03:40:34 +02:00
02fc5a772b
* libguile/vm.h: * libguile/vm.c (scm_i_vm_is_boot_continuation_code): New internal procedure. * libguile/stacks.c (scm_make_stack): * libguile/frames.c (scm_c_frame_previous): Use new helper to identify boot frames.
430 lines
11 KiB
C
430 lines
11 KiB
C
/* Copyright (C) 2001, 2009, 2010, 2011, 2012, 2013, 2014, 2015 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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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "_scm.h"
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#include "frames.h"
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#include "vm.h"
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SCM
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scm_c_make_frame (enum scm_vm_frame_kind kind, const struct scm_frame *frame)
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{
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struct scm_frame *p = scm_gc_malloc (sizeof (struct scm_frame),
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"vmframe");
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p->stack_holder = frame->stack_holder;
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p->fp_offset = frame->fp_offset;
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p->sp_offset = frame->sp_offset;
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p->ip = frame->ip;
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return scm_cell (scm_tc7_frame | (kind << 8), (scm_t_bits)p);
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}
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void
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scm_i_frame_print (SCM frame, SCM port, scm_print_state *pstate)
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{
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scm_puts_unlocked ("#<frame ", port);
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scm_uintprint (SCM_UNPACK (frame), 16, port);
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scm_putc_unlocked (' ', port);
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scm_write (scm_frame_procedure (frame), port);
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/* don't write args, they can get us into trouble. */
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scm_puts_unlocked (">", port);
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}
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static union scm_vm_stack_element*
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frame_stack_top (enum scm_vm_frame_kind kind, const struct scm_frame *frame)
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{
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switch (kind)
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{
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case SCM_VM_FRAME_KIND_CONT:
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{
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struct scm_vm_cont *cont = frame->stack_holder;
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return cont->stack_bottom + cont->stack_size;
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}
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case SCM_VM_FRAME_KIND_VM:
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return ((struct scm_vm *) frame->stack_holder)->stack_top;
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default:
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abort ();
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}
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}
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static scm_t_ptrdiff
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frame_offset (enum scm_vm_frame_kind kind, const struct scm_frame *frame)
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{
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switch (kind)
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{
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case SCM_VM_FRAME_KIND_CONT:
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return ((struct scm_vm_cont *) frame->stack_holder)->reloc;
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case SCM_VM_FRAME_KIND_VM:
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return 0;
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default:
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abort ();
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}
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}
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union scm_vm_stack_element*
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scm_i_frame_stack_top (SCM frame)
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#define FUNC_NAME "frame-stack-top"
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return frame_stack_top (SCM_VM_FRAME_KIND (frame),
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SCM_VM_FRAME_DATA (frame));
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}
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#undef FUNC_NAME
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scm_t_ptrdiff
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scm_i_frame_offset (SCM frame)
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#define FUNC_NAME "frame-offset"
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return frame_offset (SCM_VM_FRAME_KIND (frame),
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SCM_VM_FRAME_DATA (frame));
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}
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#undef FUNC_NAME
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/* Scheme interface */
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SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0,
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(SCM obj),
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"")
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#define FUNC_NAME s_scm_frame_p
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{
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return scm_from_bool (SCM_VM_FRAME_P (obj));
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}
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#undef FUNC_NAME
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/* Retrieve the local in slot 0, which may or may not actually be a
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procedure, and may or may not actually be the procedure being
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applied. If you want the procedure, look it up from the IP. */
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SCM
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scm_c_frame_closure (enum scm_vm_frame_kind kind, const struct scm_frame *frame)
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{
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union scm_vm_stack_element *fp, *sp;
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fp = frame_stack_top (kind, frame) - frame->fp_offset;
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sp = frame_stack_top (kind, frame) - frame->sp_offset;
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if (SCM_FRAME_NUM_LOCALS (fp, sp) > 0)
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return SCM_FRAME_LOCAL (fp, 0);
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return SCM_BOOL_F;
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}
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SCM_DEFINE (scm_frame_procedure, "frame-procedure", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_procedure
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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/* FIXME: Retrieve procedure from address? */
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return scm_c_frame_closure (SCM_VM_FRAME_KIND (frame),
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SCM_VM_FRAME_DATA (frame));
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}
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#undef FUNC_NAME
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static SCM frame_arguments_var;
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static void
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init_frame_arguments_var (void)
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{
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frame_arguments_var
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= scm_c_private_lookup ("system vm frame", "frame-arguments");
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}
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SCM_DEFINE (scm_frame_arguments, "frame-arguments", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_arguments
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{
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static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
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scm_i_pthread_once (&once, init_frame_arguments_var);
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_call_1 (scm_variable_ref (frame_arguments_var), frame);
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}
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#undef FUNC_NAME
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static SCM frame_call_representation_var;
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static void
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init_frame_call_representation_var (void)
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{
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frame_call_representation_var
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= scm_c_private_lookup ("system vm frame", "frame-call-representation");
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}
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SCM scm_frame_call_representation (SCM frame)
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#define FUNC_NAME "frame-call-representation"
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{
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static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
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scm_i_pthread_once (&once, init_frame_call_representation_var);
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_call_1 (scm_variable_ref (frame_call_representation_var), frame);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_source, "frame-source", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_source
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_find_source_for_addr (scm_frame_instruction_pointer (frame));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_num_locals, "frame-num-locals", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_num_locals
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{
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union scm_vm_stack_element *fp, *sp;
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SCM_VALIDATE_VM_FRAME (1, frame);
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fp = SCM_VM_FRAME_FP (frame);
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sp = SCM_VM_FRAME_SP (frame);
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return scm_from_ptrdiff_t (SCM_FRAME_NUM_LOCALS (fp, sp));
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}
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#undef FUNC_NAME
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enum stack_item_representation
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{
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STACK_ITEM_SCM = 0,
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STACK_ITEM_F64 = 1
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};
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static enum stack_item_representation
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scm_to_stack_item_representation (SCM x, const char *subr, int pos)
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{
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if (scm_is_eq (x, scm_from_latin1_symbol ("scm")))
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return STACK_ITEM_SCM;
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if (scm_is_eq (x, scm_from_latin1_symbol ("f64")))
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return STACK_ITEM_F64;
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scm_wrong_type_arg (subr, pos, x);
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return 0; /* Not reached. */
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}
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SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 3, 0, 0,
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(SCM frame, SCM index, SCM representation),
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"")
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#define FUNC_NAME s_scm_frame_local_ref
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{
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union scm_vm_stack_element *fp, *sp;
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unsigned int i;
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enum stack_item_representation repr;
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SCM_VALIDATE_VM_FRAME (1, frame);
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SCM_VALIDATE_UINT_COPY (2, index, i);
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repr = scm_to_stack_item_representation (representation, FUNC_NAME, SCM_ARG3);
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fp = SCM_VM_FRAME_FP (frame);
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sp = SCM_VM_FRAME_SP (frame);
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if (i < SCM_FRAME_NUM_LOCALS (fp, sp))
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{
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union scm_vm_stack_element *item = SCM_FRAME_SLOT (fp, i);
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switch (repr)
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{
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case STACK_ITEM_SCM:
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return item->as_scm;
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case STACK_ITEM_F64:
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return scm_from_double (item->as_f64);
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default:
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abort();
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}
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}
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SCM_OUT_OF_RANGE (SCM_ARG2, index);
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}
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#undef FUNC_NAME
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/* Need same not-yet-active frame logic here as in frame-num-locals */
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SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 4, 0, 0,
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(SCM frame, SCM index, SCM val, SCM representation),
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"")
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#define FUNC_NAME s_scm_frame_local_set_x
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{
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union scm_vm_stack_element *fp, *sp;
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unsigned int i;
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enum stack_item_representation repr;
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SCM_VALIDATE_VM_FRAME (1, frame);
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SCM_VALIDATE_UINT_COPY (2, index, i);
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repr = scm_to_stack_item_representation (representation, FUNC_NAME, SCM_ARG3);
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fp = SCM_VM_FRAME_FP (frame);
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sp = SCM_VM_FRAME_SP (frame);
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if (i < SCM_FRAME_NUM_LOCALS (fp, sp))
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{
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union scm_vm_stack_element *item = SCM_FRAME_SLOT (fp, i);
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switch (repr)
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{
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case STACK_ITEM_SCM:
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item->as_scm = val;
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break;
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case STACK_ITEM_F64:
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item->as_f64 = scm_to_double (val);
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break;
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default:
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abort();
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}
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return SCM_UNSPECIFIED;
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}
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SCM_OUT_OF_RANGE (SCM_ARG2, index);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_address, "frame-address", 1, 0, 0,
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(SCM frame),
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"Return the frame pointer for @var{frame}.")
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#define FUNC_NAME s_scm_frame_address
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_from_ptrdiff_t (SCM_VM_FRAME_FP_OFFSET (frame));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_stack_pointer, "frame-stack-pointer", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_stack_pointer
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_from_ptrdiff_t (SCM_VM_FRAME_SP_OFFSET (frame));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_instruction_pointer, "frame-instruction-pointer", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_instruction_pointer
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_from_uintptr_t ((scm_t_uintptr) SCM_VM_FRAME_IP (frame));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_return_address
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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return scm_from_uintptr_t ((scm_t_uintptr) (SCM_FRAME_RETURN_ADDRESS
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(SCM_VM_FRAME_FP (frame))));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_dynamic_link
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{
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SCM_VALIDATE_VM_FRAME (1, frame);
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/* fixme: munge fp if holder is a continuation */
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return scm_from_uintptr_t
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((scm_t_uintptr)
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SCM_FRAME_DYNAMIC_LINK (SCM_VM_FRAME_FP (frame)));
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}
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#undef FUNC_NAME
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int
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scm_c_frame_previous (enum scm_vm_frame_kind kind, struct scm_frame *frame)
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{
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union scm_vm_stack_element *this_fp, *new_fp, *new_sp;
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union scm_vm_stack_element *stack_top = frame_stack_top (kind, frame);
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again:
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this_fp = stack_top - frame->fp_offset;
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if (this_fp == stack_top)
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return 0;
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new_fp = SCM_FRAME_DYNAMIC_LINK (this_fp);
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if (new_fp >= stack_top)
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return 0;
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new_sp = SCM_FRAME_PREVIOUS_SP (this_fp);
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frame->fp_offset = stack_top - new_fp;
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frame->sp_offset = stack_top - new_sp;
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frame->ip = SCM_FRAME_RETURN_ADDRESS (this_fp);
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if (scm_i_vm_is_boot_continuation_code (frame->ip))
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goto again;
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return 1;
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}
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SCM_DEFINE (scm_frame_previous, "frame-previous", 1, 0, 0,
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(SCM frame),
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"")
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#define FUNC_NAME s_scm_frame_previous
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{
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enum scm_vm_frame_kind kind;
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struct scm_frame tmp;
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SCM_VALIDATE_VM_FRAME (1, frame);
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kind = SCM_VM_FRAME_KIND (frame);
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memcpy (&tmp, SCM_VM_FRAME_DATA (frame), sizeof tmp);
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if (!scm_c_frame_previous (SCM_VM_FRAME_KIND (frame), &tmp))
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return SCM_BOOL_F;
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return scm_c_make_frame (kind, &tmp);
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}
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#undef FUNC_NAME
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void
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scm_init_frames (void)
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{
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#ifndef SCM_MAGIC_SNARFER
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#include "libguile/frames.x"
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#endif
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}
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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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