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- #if HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <alloca.h>
- #include "libguile/_scm.h"
- #include "libguile/control.h"
- #include "libguile/programs.h"
- #include "libguile/instructions.h"
- #include "libguile/vm.h"
- #define PROMPT_ESCAPE_P(p) \
- (SCM_DYNSTACK_TAG_FLAGS (SCM_DYNSTACK_TAG (p)) \
- & SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY)
- SCM
- scm_i_prompt_pop_abort_args_x (struct scm_vm *vp,
- scm_t_ptrdiff saved_stack_depth)
- {
- size_t i, n;
- scm_t_ptrdiff stack_depth;
- SCM vals = SCM_EOL;
- stack_depth = vp->stack_top - vp->sp;
- if (stack_depth < saved_stack_depth)
- abort ();
- n = stack_depth - saved_stack_depth;
- for (i = 0; i < n; i++)
- vals = scm_cons (vp->sp[i].as_scm, vals);
- vp->sp += n;
- return vals;
- }
- static const scm_t_uint32 compose_continuation_code[] =
- {
- SCM_PACK_OP_24 (compose_continuation, 0)
- };
- static SCM
- make_partial_continuation (SCM vm_cont)
- {
- scm_t_bits nfree = 1;
- scm_t_bits flags = SCM_F_PROGRAM_IS_PARTIAL_CONTINUATION;
- SCM ret;
- ret = scm_words (scm_tc7_program | (nfree << 16) | flags, nfree + 2);
- SCM_SET_CELL_WORD_1 (ret, compose_continuation_code);
- SCM_PROGRAM_FREE_VARIABLE_SET (ret, 0, vm_cont);
- return ret;
- }
- static SCM
- reify_partial_continuation (struct scm_vm *vp,
- union scm_vm_stack_element *saved_fp,
- union scm_vm_stack_element *saved_sp,
- scm_t_uint32 *saved_ip,
- scm_i_jmp_buf *saved_registers,
- scm_t_dynstack *dynstack,
- scm_i_jmp_buf *current_registers)
- {
- SCM vm_cont;
- scm_t_uint32 flags;
- union scm_vm_stack_element *base_fp;
- flags = SCM_F_VM_CONT_PARTIAL;
-
- if (saved_registers && saved_registers == current_registers)
- flags |= SCM_F_VM_CONT_REWINDABLE;
-
- for (base_fp = vp->fp;
- SCM_FRAME_DYNAMIC_LINK (base_fp) < saved_fp;
- base_fp = SCM_FRAME_DYNAMIC_LINK (base_fp));
- if (SCM_FRAME_DYNAMIC_LINK (base_fp) != saved_fp)
- abort();
-
- vm_cont = scm_i_vm_capture_stack (base_fp, vp->fp, vp->sp, vp->ip, dynstack,
- flags);
- return make_partial_continuation (vm_cont);
- }
- void
- scm_c_abort (struct scm_vm *vp, SCM tag, size_t n, SCM *argv,
- scm_i_jmp_buf *current_registers)
- {
- SCM cont;
- scm_t_dynstack *dynstack = &SCM_I_CURRENT_THREAD->dynstack;
- scm_t_bits *prompt;
- scm_t_dynstack_prompt_flags flags;
- scm_t_ptrdiff fp_offset, sp_offset;
- union scm_vm_stack_element *fp, *sp;
- scm_t_uint32 *ip;
- scm_i_jmp_buf *registers;
- size_t i;
- prompt = scm_dynstack_find_prompt (dynstack, tag,
- &flags, &fp_offset, &sp_offset, &ip,
- ®isters);
- if (!prompt)
- scm_misc_error ("abort", "Abort to unknown prompt", scm_list_1 (tag));
- fp = vp->stack_top - fp_offset;
- sp = vp->stack_top - sp_offset;
-
- if (flags & SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY)
- cont = SCM_BOOL_F;
- else
- {
- scm_t_dynstack *captured;
- captured = scm_dynstack_capture (dynstack, SCM_DYNSTACK_NEXT (prompt));
- cont = reify_partial_continuation (vp, fp, sp, ip, registers, captured,
- current_registers);
- }
-
- scm_dynstack_unwind (dynstack, prompt);
-
- vp->fp = fp;
- vp->sp = sp - n - 1;
- vp->ip = ip;
-
- if (vp->sp < vp->stack_limit)
- abort ();
-
- vp->sp[n].as_scm = cont;
- for (i = 0; i < n; i++)
- vp->sp[n - i - 1].as_scm = argv[i];
-
- SCM_I_LONGJMP (*registers, 1);
-
- abort ();
- }
- SCM_DEFINE (scm_abort_to_prompt_star, "abort-to-prompt*", 2, 0, 0,
- (SCM tag, SCM args),
- "Abort to the nearest prompt with tag @var{tag}, yielding the\n"
- "values in the list, @var{args}.")
- #define FUNC_NAME s_scm_abort_to_prompt_star
- {
- SCM *argv;
- size_t i;
- long n;
- SCM_VALIDATE_LIST_COPYLEN (SCM_ARG2, args, n);
- argv = alloca (sizeof (SCM)*n);
- for (i = 0; i < n; i++, args = scm_cdr (args))
- argv[i] = scm_car (args);
- scm_c_abort (scm_the_vm (), tag, n, argv, NULL);
-
- abort ();
- }
- #undef FUNC_NAME
- void
- scm_init_control (void)
- {
- #include "libguile/control.x"
- }
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