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Diffstat (limited to 'libguile/control.c')
-rw-r--r--libguile/control.c119
1 files changed, 48 insertions, 71 deletions
diff --git a/libguile/control.c b/libguile/control.c
index ff6bfd89a..613ffbe4c 100644
--- a/libguile/control.c
+++ b/libguile/control.c
@@ -30,18 +30,18 @@
+#define PROMPT_ESCAPE_P(p) \
+ (SCM_DYNSTACK_TAG_FLAGS (SCM_DYNSTACK_TAG (p)) \
+ & SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY)
-SCM
-scm_c_make_prompt (SCM k, SCM *fp, SCM *sp, scm_t_uint8 *abort_ip,
- scm_t_uint8 escape_only_p, scm_t_int64 vm_cookie,
- SCM winds)
-{
- scm_t_bits tag;
- struct scm_prompt_registers *regs;
+
- tag = scm_tc7_prompt;
- if (escape_only_p)
- tag |= (SCM_F_PROMPT_ESCAPE<<8);
+
+scm_t_prompt_registers*
+scm_c_make_prompt_registers (SCM *fp, SCM *sp, scm_t_uint8 *abort_ip,
+ scm_t_int64 vm_cookie)
+{
+ scm_t_prompt_registers *regs;
regs = scm_gc_malloc_pointerless (sizeof (*regs), "prompt registers");
regs->fp = fp;
@@ -49,11 +49,10 @@ scm_c_make_prompt (SCM k, SCM *fp, SCM *sp, scm_t_uint8 *abort_ip,
regs->ip = abort_ip;
regs->cookie = vm_cookie;
- return scm_double_cell (tag, SCM_UNPACK (k), (scm_t_bits)regs,
- SCM_UNPACK (winds));
+ return regs;
}
-/* Only to be called if the SCM_PROMPT_SETJMP returns 1 */
+/* Only to be called if the SCM_I_SETJMP returns 1 */
SCM
scm_i_prompt_pop_abort_args_x (SCM vm)
{
@@ -115,9 +114,9 @@ SCM_STATIC_OBJCODE (cont_objcode) = {
OBJCODE_HEADER (8, 19),
/* leave args on the stack */
/* 0 */ scm_op_object_ref, 0, /* push scm_vm_cont object */
- /* 2 */ scm_op_object_ref, 1, /* push internal winds */
- /* 4 */ scm_op_partial_cont_call, /* and go! */
- /* 5 */ scm_op_nop, scm_op_nop, scm_op_nop, /* pad to 8 bytes */
+ /* 2 */ scm_op_partial_cont_call, /* and go! */
+ /* 3 */ scm_op_nop,
+ /* 4 */ scm_op_nop, scm_op_nop, scm_op_nop, scm_op_nop, /* pad to 8 bytes */
/* 8 */
/* We could put some meta-info to say that this proc is a continuation. Not sure
@@ -125,7 +124,7 @@ SCM_STATIC_OBJCODE (cont_objcode) = {
META_HEADER (19),
/* 0 */ scm_op_make_eol, /* bindings */
/* 1 */ scm_op_make_eol, /* sources */
- /* 2 */ scm_op_make_int8, 0, scm_op_make_int8, 5, /* arity: from ip 0 to ip 7 */
+ /* 2 */ scm_op_make_int8, 0, scm_op_make_int8, 3, /* arity: from ip 0 to ip 3 */
/* 6 */ scm_op_make_int8_0, /* the arity is 0 required args */
/* 7 */ scm_op_make_int8_0, /* 0 optionals */
/* 8 */ scm_op_make_true, /* and a rest arg */
@@ -138,45 +137,35 @@ SCM_STATIC_OBJCODE (cont_objcode) = {
static SCM
-reify_partial_continuation (SCM vm, SCM prompt, SCM extwinds,
+reify_partial_continuation (SCM vm, scm_t_prompt_registers *regs,
+ scm_t_dynstack *dynstack,
scm_t_int64 cookie)
{
- SCM vm_cont, dynwinds, intwinds = SCM_EOL, ret;
+ SCM vm_cont, ret;
scm_t_uint32 flags;
- /* No need to reify if the continuation is never referenced in the handler. */
- if (SCM_PROMPT_ESCAPE_P (prompt))
- return SCM_BOOL_F;
-
- dynwinds = scm_i_dynwinds ();
- while (!scm_is_eq (dynwinds, extwinds))
- {
- intwinds = scm_cons (scm_car (dynwinds), intwinds);
- dynwinds = scm_cdr (dynwinds);
- }
-
flags = SCM_F_VM_CONT_PARTIAL;
- if (cookie >= 0 && SCM_PROMPT_REGISTERS (prompt)->cookie == cookie)
+ if (cookie >= 0 && regs->cookie == cookie)
flags |= SCM_F_VM_CONT_REWINDABLE;
/* Since non-escape continuations should begin with a thunk application, the
first bit of the stack should be a frame, with the saved fp equal to the fp
that was current when the prompt was made. */
- if ((SCM*)SCM_UNPACK (SCM_PROMPT_REGISTERS (prompt)->sp[1])
- != SCM_PROMPT_REGISTERS (prompt)->fp)
+ if ((SCM*)SCM_UNPACK (regs->sp[1]) != regs->fp)
abort ();
/* Capture from the top of the thunk application frame up to the end. Set an
MVRA only, as the post-abort code is in an MV context. */
- vm_cont = scm_i_vm_capture_stack (SCM_PROMPT_REGISTERS (prompt)->sp + 4,
+ vm_cont = scm_i_vm_capture_stack (regs->sp + 4,
SCM_VM_DATA (vm)->fp,
SCM_VM_DATA (vm)->sp,
NULL,
SCM_VM_DATA (vm)->ip,
+ dynstack,
flags);
ret = scm_make_program (cont_objcode,
- scm_vector (scm_list_2 (vm_cont, intwinds)),
+ scm_c_make_vector (1, vm_cont),
SCM_BOOL_F);
SCM_SET_CELL_WORD_0 (ret,
SCM_CELL_WORD_0 (ret) | SCM_F_PROGRAM_IS_PARTIAL_CONTINUATION);
@@ -186,46 +175,42 @@ reify_partial_continuation (SCM vm, SCM prompt, SCM extwinds,
void
scm_c_abort (SCM vm, SCM tag, size_t n, SCM *argv, scm_t_int64 cookie)
{
- SCM cont, winds, prompt = SCM_BOOL_F;
- long delta;
+ SCM cont;
+ scm_t_dynstack *dynstack = &SCM_I_CURRENT_THREAD->dynstack;
+ scm_t_bits *prompt;
+ scm_t_prompt_registers *regs;
+ scm_t_dynstack_prompt_flags flags;
size_t i;
- /* Search the wind list for an appropriate prompt.
- "Waiter, please bring us the wind list." */
- for (winds = scm_i_dynwinds (), delta = 0;
- scm_is_pair (winds);
- winds = SCM_CDR (winds), delta++)
- {
- SCM elt = SCM_CAR (winds);
- if (SCM_PROMPT_P (elt) && scm_is_eq (SCM_PROMPT_TAG (elt), tag))
- {
- prompt = elt;
- break;
- }
- }
-
- /* If we didn't find anything, raise an error. */
- if (scm_is_false (prompt))
+ prompt = scm_dynstack_find_prompt (dynstack, tag, &regs, &flags);
+
+ if (!prompt)
scm_misc_error ("abort", "Abort to unknown prompt", scm_list_1 (tag));
- cont = reify_partial_continuation (vm, prompt, winds, cookie);
+ /* Only reify if the continuation referenced in the handler. */
+ if (flags & SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY)
+ cont = SCM_BOOL_F;
+ else
+ {
+ scm_t_dynstack *captured;
- /* Unwind once more, beyond the prompt. */
- winds = SCM_CDR (winds), delta++;
+ captured = scm_dynstack_capture (dynstack, SCM_DYNSTACK_NEXT (prompt));
+ cont = reify_partial_continuation (vm, regs, captured, cookie);
+ }
- /* Unwind */
- scm_dowinds (winds, delta);
+ /* Unwind. */
+ scm_dynstack_unwind (dynstack, prompt);
/* Unwinding may have changed the current thread's VM, so use the
new one. */
vm = scm_the_vm ();
/* Restore VM regs */
- SCM_VM_DATA (vm)->fp = SCM_PROMPT_REGISTERS (prompt)->fp;
- SCM_VM_DATA (vm)->sp = SCM_PROMPT_REGISTERS (prompt)->sp;
- SCM_VM_DATA (vm)->ip = SCM_PROMPT_REGISTERS (prompt)->ip;
+ SCM_VM_DATA (vm)->fp = regs->fp;
+ SCM_VM_DATA (vm)->sp = regs->sp;
+ SCM_VM_DATA (vm)->ip = regs->ip;
- /* Since we're jumping down, we should always have enough space */
+ /* Since we're jumping down, we should always have enough space. */
if (SCM_VM_DATA (vm)->sp + n + 1 >= SCM_VM_DATA (vm)->stack_limit)
abort ();
@@ -236,7 +221,7 @@ scm_c_abort (SCM vm, SCM tag, size_t n, SCM *argv, scm_t_int64 cookie)
*(++(SCM_VM_DATA (vm)->sp)) = scm_from_size_t (n+1); /* +1 for continuation */
/* Jump! */
- SCM_I_LONGJMP (SCM_PROMPT_REGISTERS (prompt)->regs, 1);
+ SCM_I_LONGJMP (regs->regs, 1);
/* Shouldn't get here */
abort ();
@@ -266,14 +251,6 @@ SCM_DEFINE (scm_at_abort, "@abort", 2, 0, 0, (SCM tag, SCM args),
#undef FUNC_NAME
void
-scm_i_prompt_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
-{
- scm_puts_unlocked ("#<prompt ", port);
- scm_intprint (SCM_UNPACK (exp), 16, port);
- scm_putc_unlocked ('>', port);
-}
-
-void
scm_init_control (void)
{
#include "libguile/control.x"