-/* Copyright (C) 2001, 2009, 2010 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
#include <stdlib.h>
#include <alloca.h>
+#include <alignof.h>
#include <string.h>
+#include <stdint.h>
#include "libguile/bdw-gc.h"
#include <gc/gc_mark.h>
#include "_scm.h"
+#include "control.h"
#include "frames.h"
#include "instructions.h"
#include "objcodes.h"
#include "programs.h"
-#include "lang.h" /* NULL_OR_NIL_P */
#include "vm.h"
-/* I sometimes use this for debugging. */
-#define vm_puts(OBJ) \
-{ \
- scm_display (OBJ, scm_current_error_port ()); \
- scm_newline (scm_current_error_port ()); \
-}
+static int vm_default_engine = SCM_VM_REGULAR_ENGINE;
+
+/* Unfortunately we can't snarf these: snarfed things are only loaded up from
+ (system vm vm), which might not be loaded before an error happens. */
+static SCM sym_vm_run;
+static SCM sym_vm_error;
+static SCM sym_keyword_argument_error;
+static SCM sym_regular;
+static SCM sym_debug;
/* The VM has a number of internal assertions that shouldn't normally be
necessary, but might be if you think you found a bug in the VM. */
for a discussion. */
#define VM_ENABLE_PRECISE_STACK_GC_SCAN
+/* Size in SCM objects of the stack reserve. The reserve is used to run
+ exception handling code in case of a VM stack overflow. */
+#define VM_STACK_RESERVE_SIZE 512
+
\f
/*
void
scm_i_vm_cont_print (SCM x, SCM port, scm_print_state *pstate)
{
- scm_puts ("#<vm-continuation ", port);
+ scm_puts_unlocked ("#<vm-continuation ", port);
scm_uintprint (SCM_UNPACK (x), 16, port);
- scm_puts (">", port);
+ scm_puts_unlocked (">", port);
}
-static SCM
-capture_vm_cont (struct scm_vm *vp)
+/* In theory, a number of vm instances can be active in the call trace, and we
+ only want to reify the continuations of those in the current continuation
+ root. I don't see a nice way to do this -- ideally it would involve dynwinds,
+ and previous values of the *the-vm* fluid within the current continuation
+ root. But we don't have access to continuation roots in the dynwind stack.
+ So, just punt for now, we just capture the continuation for the current VM.
+
+ While I'm on the topic, ideally we could avoid copying the C stack if the
+ continuation root is inside VM code, and call/cc was invoked within that same
+ call to vm_run; but that's currently not implemented.
+ */
+SCM
+scm_i_vm_capture_stack (SCM *stack_base, SCM *fp, SCM *sp, scm_t_uint8 *ra,
+ scm_t_uint8 *mvra, scm_t_dynstack *dynstack,
+ scm_t_uint32 flags)
{
- struct scm_vm_cont *p = scm_gc_malloc (sizeof (*p), "capture_vm_cont");
- p->stack_size = vp->sp - vp->stack_base + 1;
+ struct scm_vm_cont *p;
+
+ p = scm_gc_malloc (sizeof (*p), "capture_vm_cont");
+ p->stack_size = sp - stack_base + 1;
p->stack_base = scm_gc_malloc (p->stack_size * sizeof (SCM),
"capture_vm_cont");
-#ifdef VM_ENABLE_STACK_NULLING
- if (vp->sp >= vp->stack_base)
+#if defined(VM_ENABLE_STACK_NULLING) && 0
+ /* Tail continuations leave their frame on the stack for subsequent
+ application, but don't capture the frame -- so there are some elements on
+ the stack then, and this check doesn't work, so disable it for now. */
+ if (sp >= vp->stack_base)
if (!vp->sp[0] || vp->sp[1])
abort ();
memset (p->stack_base, 0, p->stack_size * sizeof (SCM));
#endif
- p->ip = vp->ip;
- p->sp = vp->sp;
- p->fp = vp->fp;
- memcpy (p->stack_base, vp->stack_base, p->stack_size * sizeof (SCM));
- p->reloc = p->stack_base - vp->stack_base;
+ p->ra = ra;
+ p->mvra = mvra;
+ p->sp = sp;
+ p->fp = fp;
+ memcpy (p->stack_base, stack_base, (sp + 1 - stack_base) * sizeof (SCM));
+ p->reloc = p->stack_base - stack_base;
+ p->dynstack = dynstack;
+ p->flags = flags;
return scm_cell (scm_tc7_vm_cont, (scm_t_bits)p);
}
static void
-reinstate_vm_cont (struct scm_vm *vp, SCM cont)
+vm_return_to_continuation (SCM vm, SCM cont, size_t n, SCM *argv)
{
- struct scm_vm_cont *p = SCM_VM_CONT_DATA (cont);
- if (vp->stack_size < p->stack_size)
- {
- /* puts ("FIXME: Need to expand"); */
- abort ();
- }
+ struct scm_vm *vp;
+ struct scm_vm_cont *cp;
+ SCM *argv_copy;
+
+ argv_copy = alloca (n * sizeof(SCM));
+ memcpy (argv_copy, argv, n * sizeof(SCM));
+
+ vp = SCM_VM_DATA (vm);
+ cp = SCM_VM_CONT_DATA (cont);
+
+ if (n == 0 && !cp->mvra)
+ scm_misc_error (NULL, "Too few values returned to continuation",
+ SCM_EOL);
+
+ if (vp->stack_size < cp->stack_size + n + 1)
+ scm_misc_error ("vm-engine", "not enough space to reinstate continuation",
+ scm_list_2 (vm, cont));
+
#ifdef VM_ENABLE_STACK_NULLING
{
- scm_t_ptrdiff nzero = (vp->sp - p->sp);
+ scm_t_ptrdiff nzero = (vp->sp - cp->sp);
if (nzero > 0)
- memset (vp->stack_base + p->stack_size, 0, nzero * sizeof (SCM));
+ memset (vp->stack_base + cp->stack_size, 0, nzero * sizeof (SCM));
/* actually nzero should always be negative, because vm_reset_stack will
unwind the stack to some point *below* this continuation */
}
#endif
- vp->ip = p->ip;
- vp->sp = p->sp;
- vp->fp = p->fp;
- memcpy (vp->stack_base, p->stack_base, p->stack_size * sizeof (SCM));
-}
+ vp->sp = cp->sp;
+ vp->fp = cp->fp;
+ memcpy (vp->stack_base, cp->stack_base, cp->stack_size * sizeof (SCM));
-/* In theory, a number of vm instances can be active in the call trace, and we
- only want to reify the continuations of those in the current continuation
- root. I don't see a nice way to do this -- ideally it would involve dynwinds,
- and previous values of the *the-vm* fluid within the current continuation
- root. But we don't have access to continuation roots in the dynwind stack.
- So, just punt for now -- take the current value of *the-vm*.
+ if (n == 1 || !cp->mvra)
+ {
+ vp->ip = cp->ra;
+ vp->sp++;
+ *vp->sp = argv_copy[0];
+ }
+ else
+ {
+ size_t i;
+ for (i = 0; i < n; i++)
+ {
+ vp->sp++;
+ *vp->sp = argv_copy[i];
+ }
+ vp->sp++;
+ *vp->sp = scm_from_size_t (n);
+ vp->ip = cp->mvra;
+ }
+}
- While I'm on the topic, ideally we could avoid copying the C stack if the
- continuation root is inside VM code, and call/cc was invoked within that same
- call to vm_run; but that's currently not implemented.
- */
SCM
-scm_vm_capture_continuations (void)
+scm_i_capture_current_stack (void)
{
- SCM vm = scm_the_vm ();
- return scm_acons (vm, capture_vm_cont (SCM_VM_DATA (vm)), SCM_EOL);
-}
+ scm_i_thread *thread;
+ SCM vm;
+ struct scm_vm *vp;
-void
-scm_vm_reinstate_continuations (SCM conts)
-{
- for (; conts != SCM_EOL; conts = SCM_CDR (conts))
- reinstate_vm_cont (SCM_VM_DATA (SCM_CAAR (conts)), SCM_CDAR (conts));
+ thread = SCM_I_CURRENT_THREAD;
+ vm = scm_the_vm ();
+ vp = SCM_VM_DATA (vm);
+
+ return scm_i_vm_capture_stack (vp->stack_base, vp->fp, vp->sp, vp->ip, NULL,
+ scm_dynstack_capture_all (&thread->dynstack),
+ 0);
}
static void
{
struct scm_vm *vp;
SCM hook;
- SCM frame;
+ struct scm_frame c_frame;
+ scm_t_cell *frame;
+ SCM args[1];
+ int saved_trace_level;
vp = SCM_VM_DATA (vm);
hook = vp->hooks[hook_num];
if (SCM_LIKELY (scm_is_false (hook))
|| scm_is_null (SCM_HOOK_PROCEDURES (hook)))
return;
+
+ saved_trace_level = vp->trace_level;
+ vp->trace_level = 0;
+
+ /* Allocate a frame object on the stack. This is more efficient than calling
+ `scm_c_make_frame ()' to allocate on the heap, but it forces hooks to not
+ capture frame objects.
+
+ At the same time, procedures such as `frame-procedure' make sense only
+ while the stack frame represented by the frame object is visible, so it
+ seems reasonable to limit the lifetime of frame objects. */
+
+ c_frame.stack_holder = vm;
+ c_frame.fp = vp->fp;
+ c_frame.sp = vp->sp;
+ c_frame.ip = vp->ip;
+ c_frame.offset = 0;
+
+ /* Arrange for FRAME to be 8-byte aligned, like any other cell. */
+ frame = alloca (sizeof (*frame) + 8);
+ frame = (scm_t_cell *) ROUND_UP ((scm_t_uintptr) frame, 8UL);
+
+ frame->word_0 = SCM_PACK (scm_tc7_frame);
+ frame->word_1 = SCM_PACK_POINTER (&c_frame);
+ args[0] = SCM_PACK_POINTER (frame);
+
+ scm_c_run_hookn (hook, args, 1);
+
+ vp->trace_level = saved_trace_level;
+}
+
+static void
+vm_abort (SCM vm, size_t n, scm_i_jmp_buf *current_registers) SCM_NORETURN;
+
+static void
+vm_abort (SCM vm, size_t n, scm_i_jmp_buf *current_registers)
+{
+ size_t i;
+ ssize_t tail_len;
+ SCM tag, tail, *argv;
- vp->trace_level--;
- frame = scm_c_make_frame (vm, vp->fp, vp->sp, vp->ip, 0);
- scm_c_run_hookn (hook, &frame, 1);
- vp->trace_level++;
+ /* FIXME: VM_ENABLE_STACK_NULLING */
+ tail = *(SCM_VM_DATA (vm)->sp--);
+ /* NULLSTACK (1) */
+ tail_len = scm_ilength (tail);
+ if (tail_len < 0)
+ scm_misc_error ("vm-engine", "tail values to abort should be a list",
+ scm_list_1 (tail));
+
+ tag = SCM_VM_DATA (vm)->sp[-n];
+ argv = alloca ((n + tail_len) * sizeof (SCM));
+ for (i = 0; i < n; i++)
+ argv[i] = SCM_VM_DATA (vm)->sp[-(n-1-i)];
+ for (; i < n + tail_len; i++, tail = scm_cdr (tail))
+ argv[i] = scm_car (tail);
+ /* NULLSTACK (n + 1) */
+ SCM_VM_DATA (vm)->sp -= n + 1;
+
+ scm_c_abort (vm, tag, n + tail_len, argv, current_registers);
+}
+
+static void
+vm_reinstate_partial_continuation (SCM vm, SCM cont, size_t n, SCM *argv,
+ scm_t_dynstack *dynstack,
+ scm_i_jmp_buf *registers)
+{
+ struct scm_vm *vp;
+ struct scm_vm_cont *cp;
+ SCM *argv_copy, *base;
+ scm_t_ptrdiff reloc;
+ size_t i;
+
+ argv_copy = alloca (n * sizeof(SCM));
+ memcpy (argv_copy, argv, n * sizeof(SCM));
+
+ vp = SCM_VM_DATA (vm);
+ cp = SCM_VM_CONT_DATA (cont);
+ base = SCM_FRAME_UPPER_ADDRESS (vp->fp) + 1;
+ reloc = cp->reloc + (base - cp->stack_base);
+
+#define RELOC(scm_p) \
+ (((SCM *) (scm_p)) + reloc)
+
+ if ((base - vp->stack_base) + cp->stack_size + n + 1 > vp->stack_size)
+ scm_misc_error ("vm-engine",
+ "not enough space to instate partial continuation",
+ scm_list_2 (vm, cont));
+
+ memcpy (base, cp->stack_base, cp->stack_size * sizeof (SCM));
+
+ /* now relocate frame pointers */
+ {
+ SCM *fp;
+ for (fp = RELOC (cp->fp);
+ SCM_FRAME_LOWER_ADDRESS (fp) > base;
+ fp = SCM_FRAME_DYNAMIC_LINK (fp))
+ SCM_FRAME_SET_DYNAMIC_LINK (fp, RELOC (SCM_FRAME_DYNAMIC_LINK (fp)));
+ }
+
+ vp->sp = base - 1 + cp->stack_size;
+ vp->fp = RELOC (cp->fp);
+ vp->ip = cp->mvra;
+
+ /* now push args. ip is in a MV context. */
+ for (i = 0; i < n; i++)
+ {
+ vp->sp++;
+ *vp->sp = argv_copy[i];
+ }
+ vp->sp++;
+ *vp->sp = scm_from_size_t (n);
+
+ /* The prompt captured a slice of the dynamic stack. Here we wind
+ those entries onto the current thread's stack. We also have to
+ relocate any prompts that we see along the way. */
+ {
+ scm_t_bits *walk;
+
+ for (walk = SCM_DYNSTACK_FIRST (cp->dynstack);
+ SCM_DYNSTACK_TAG (walk);
+ walk = SCM_DYNSTACK_NEXT (walk))
+ {
+ scm_t_bits tag = SCM_DYNSTACK_TAG (walk);
+
+ if (SCM_DYNSTACK_TAG_TYPE (tag) == SCM_DYNSTACK_TYPE_PROMPT)
+ scm_dynstack_wind_prompt (dynstack, walk, reloc, registers);
+ else
+ scm_dynstack_wind_1 (dynstack, walk);
+ }
+ }
+#undef RELOC
}
\f
* VM Internal functions
*/
-SCM_SYMBOL (sym_vm_run, "vm-run");
-SCM_SYMBOL (sym_vm_error, "vm-error");
-SCM_SYMBOL (sym_keyword_argument_error, "keyword-argument-error");
-SCM_SYMBOL (sym_debug, "debug");
-
void
scm_i_vm_print (SCM x, SCM port, scm_print_state *pstate)
{
- scm_puts ("#<vm ", port);
+ const struct scm_vm *vm;
+
+ vm = SCM_VM_DATA (x);
+
+ scm_puts_unlocked ("#<vm ", port);
+ switch (vm->engine)
+ {
+ case SCM_VM_REGULAR_ENGINE:
+ scm_puts_unlocked ("regular-engine ", port);
+ break;
+
+ case SCM_VM_DEBUG_ENGINE:
+ scm_puts_unlocked ("debug-engine ", port);
+ break;
+
+ default:
+ scm_puts_unlocked ("unknown-engine ", port);
+ }
scm_uintprint (SCM_UNPACK (x), 16, port);
- scm_puts (">", port);
+ scm_puts_unlocked (">", port);
}
static SCM
SCM ret;
if (SCM_UNLIKELY (nargs > 255 || nargs < 0))
- abort ();
+ scm_misc_error ("vm-engine", "too many args when making boot procedure",
+ scm_list_1 (scm_from_long (nargs)));
+
text[1] = (scm_t_uint8)nargs;
- bp = scm_malloc (sizeof (struct scm_objcode) + sizeof (text));
+ bp = scm_gc_malloc_pointerless (sizeof (struct scm_objcode) + sizeof (text),
+ "boot-program");
memcpy (SCM_C_OBJCODE_BASE (bp), text, sizeof (text));
bp->len = sizeof(text);
bp->metalen = 0;
- u8vec = scm_take_u8vector ((scm_t_uint8*)bp,
- sizeof (struct scm_objcode) + sizeof (text));
- ret = scm_make_program (scm_bytecode_to_objcode (u8vec),
+ u8vec = scm_c_take_gc_bytevector ((scm_t_int8*)bp,
+ sizeof (struct scm_objcode) + sizeof (text),
+ SCM_BOOL_F);
+ ret = scm_make_program (scm_bytecode_to_native_objcode (u8vec),
SCM_BOOL_F, SCM_BOOL_F);
SCM_SET_CELL_WORD_0 (ret, SCM_CELL_WORD_0 (ret) | SCM_F_PROGRAM_IS_BOOT);
static SCM
vm_make_boot_program (long nargs)
{
- static SCM programs[NUM_BOOT_PROGS] = { 0, };
+ static SCM programs[NUM_BOOT_PROGS] = { SCM_BOOL_F, };
- if (SCM_UNLIKELY (!programs[0]))
+ if (SCM_UNLIKELY (scm_is_false (programs[0])))
{
int i;
for (i = 0; i < NUM_BOOT_PROGS; i++)
* VM
*/
+/* We are calling a SMOB. The calling code pushed the SMOB after the
+ args, and incremented nargs. That nargs is passed here. This
+ function's job is to replace the procedure with the trampoline, and
+ shuffle the smob itself to be argument 0. This function must not
+ allocate or throw, as the VM registers are not synchronized. */
+static void
+prepare_smob_call (SCM *sp, int nargs, SCM smob)
+{
+ SCM *args = sp - nargs + 1;
+
+ /* Shuffle args up. */
+ while (nargs--)
+ args[nargs + 1] = args[nargs];
+
+ args[0] = smob;
+ args[-1] = SCM_SMOB_DESCRIPTOR (smob).apply_trampoline;
+}
+
static SCM
resolve_variable (SCM what, SCM program_module)
{
}
}
-static SCM
-apply_foreign (SCM proc, SCM *args, int nargs, int headroom)
-{
- SCM_ASRTGO (SCM_NIMP (proc), badproc);
-
- switch (SCM_TYP7 (proc))
- {
- case scm_tc7_smob:
- if (!SCM_SMOB_APPLICABLE_P (proc))
- goto badproc;
- switch (nargs)
- {
- case 0:
- return SCM_SMOB_APPLY_0 (proc);
- case 1:
- return SCM_SMOB_APPLY_1 (proc, args[0]);
- case 2:
- return SCM_SMOB_APPLY_2 (proc, args[0], args[1]);
- default:
- {
- SCM arglist = SCM_EOL;
- while (nargs-- > 2)
- arglist = scm_cons (args[nargs], arglist);
- return SCM_SMOB_APPLY_3 (proc, args[0], args[1], arglist);
- }
- }
- default:
- badproc:
- scm_wrong_type_arg ("apply", SCM_ARG1, proc);
- }
-}
-
-
#define VM_DEFAULT_STACK_SIZE (64 * 1024)
#define VM_NAME vm_regular_engine
vp->stack_size = VM_DEFAULT_STACK_SIZE;
#ifdef VM_ENABLE_PRECISE_STACK_GC_SCAN
- vp->stack_base = GC_generic_malloc (vp->stack_size * sizeof (SCM),
- vm_stack_gc_kind);
+ vp->stack_base = (SCM *)
+ GC_generic_malloc (vp->stack_size * sizeof (SCM), vm_stack_gc_kind);
/* Keep a pointer to VP so that `vm_stack_mark ()' can know what the stack
top is. */
- *vp->stack_base = PTR2SCM (vp);
+ *vp->stack_base = SCM_PACK_POINTER (vp);
vp->stack_base++;
vp->stack_size--;
#else
#ifdef VM_ENABLE_STACK_NULLING
memset (vp->stack_base, 0, vp->stack_size * sizeof (SCM));
#endif
- vp->stack_limit = vp->stack_base + vp->stack_size;
+ vp->stack_limit = vp->stack_base + vp->stack_size - VM_STACK_RESERVE_SIZE;
vp->ip = NULL;
vp->sp = vp->stack_base - 1;
vp->fp = NULL;
- vp->engine = SCM_VM_DEBUG_ENGINE;
- vp->options = SCM_EOL;
+ vp->engine = vm_default_engine;
vp->trace_level = 0;
for (i = 0; i < SCM_VM_NUM_HOOKS; i++)
vp->hooks[i] = SCM_BOOL_F;
vm = * ((struct scm_vm **) addr);
if (vm == NULL
- || (SCM *) addr != vm->stack_base - 1
- || vm->stack_limit - vm->stack_base != vm->stack_size)
+ || (SCM *) addr != vm->stack_base - 1)
/* ADDR must be a pointer to a free-list element, which we must ignore
(see warning in <gc/gc_mark.h>). */
return mark_stack_ptr;
scm_c_vm_run (SCM vm, SCM program, SCM *argv, int nargs)
{
struct scm_vm *vp = SCM_VM_DATA (vm);
+ SCM_CHECK_STACK;
return vm_engines[vp->engine](vm, program, argv, nargs);
}
-SCM_DEFINE (scm_vm_apply, "vm-apply", 3, 0, 0,
- (SCM vm, SCM program, SCM args),
- "")
-#define FUNC_NAME s_scm_vm_apply
-{
- SCM *argv;
- int i, nargs;
-
- SCM_VALIDATE_VM (1, vm);
- SCM_VALIDATE_PROC (2, program);
-
- nargs = scm_ilength (args);
- if (SCM_UNLIKELY (nargs < 0))
- scm_wrong_type_arg_msg (FUNC_NAME, 3, args, "list");
-
- argv = alloca(nargs * sizeof(SCM));
- for (i = 0; i < nargs; i++)
- {
- argv[i] = SCM_CAR (args);
- args = SCM_CDR (args);
- }
-
- return scm_c_vm_run (vm, program, argv, nargs);
-}
-#undef FUNC_NAME
-
-SCM
-scm_vm_call_with_new_stack (SCM vm, SCM thunk, SCM id)
-{
- return scm_c_vm_run (vm, thunk, NULL, 0);
-}
-
/* Scheme interface */
-SCM_DEFINE (scm_vm_version, "vm-version", 0, 0, 0,
- (void),
- "")
-#define FUNC_NAME s_scm_vm_version
-{
- return scm_from_locale_string (PACKAGE_VERSION);
-}
-#undef FUNC_NAME
-
SCM_DEFINE (scm_the_vm, "the-vm", 0, 0, 0,
(void),
- "")
+ "Return the current thread's VM.")
#define FUNC_NAME s_scm_the_vm
{
scm_i_thread *t = SCM_I_CURRENT_THREAD;
- if (SCM_UNLIKELY (scm_is_false ((t->vm))))
+ if (SCM_UNLIKELY (scm_is_false (t->vm)))
t->vm = make_vm ();
return t->vm;
#define FUNC_NAME s_scm_vm_ip
{
SCM_VALIDATE_VM (1, vm);
- return scm_from_ulong ((unsigned long) SCM_VM_DATA (vm)->ip);
+ return scm_from_unsigned_integer ((scm_t_bits) SCM_VM_DATA (vm)->ip);
}
#undef FUNC_NAME
#define FUNC_NAME s_scm_vm_sp
{
SCM_VALIDATE_VM (1, vm);
- return scm_from_ulong ((unsigned long) SCM_VM_DATA (vm)->sp);
+ return scm_from_unsigned_integer ((scm_t_bits) SCM_VM_DATA (vm)->sp);
}
#undef FUNC_NAME
#define FUNC_NAME s_scm_vm_fp
{
SCM_VALIDATE_VM (1, vm);
- return scm_from_ulong ((unsigned long) SCM_VM_DATA (vm)->fp);
+ return scm_from_unsigned_integer ((scm_t_bits) SCM_VM_DATA (vm)->fp);
}
#undef FUNC_NAME
return vp->hooks[n]; \
}
-SCM_DEFINE (scm_vm_boot_hook, "vm-boot-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_apply_hook, "vm-apply-hook", 1, 0, 0,
+ (SCM vm),
+ "")
+#define FUNC_NAME s_scm_vm_apply_hook
+{
+ VM_DEFINE_HOOK (SCM_VM_APPLY_HOOK);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_vm_push_continuation_hook, "vm-push-continuation-hook", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_boot_hook
+#define FUNC_NAME s_scm_vm_push_continuation_hook
{
- VM_DEFINE_HOOK (SCM_VM_BOOT_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_PUSH_CONTINUATION_HOOK);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_halt_hook, "vm-halt-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_pop_continuation_hook, "vm-pop-continuation-hook", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_halt_hook
+#define FUNC_NAME s_scm_vm_pop_continuation_hook
{
- VM_DEFINE_HOOK (SCM_VM_HALT_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_POP_CONTINUATION_HOOK);
}
#undef FUNC_NAME
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_break_hook, "vm-break-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_abort_continuation_hook, "vm-abort-continuation-hook", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_break_hook
+#define FUNC_NAME s_scm_vm_abort_continuation_hook
{
- VM_DEFINE_HOOK (SCM_VM_BREAK_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_ABORT_CONTINUATION_HOOK);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_enter_hook, "vm-enter-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_restore_continuation_hook, "vm-restore-continuation-hook", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_enter_hook
+#define FUNC_NAME s_scm_vm_restore_continuation_hook
{
- VM_DEFINE_HOOK (SCM_VM_ENTER_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_RESTORE_CONTINUATION_HOOK);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_apply_hook, "vm-apply-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_trace_level, "vm-trace-level", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_apply_hook
+#define FUNC_NAME s_scm_vm_trace_level
{
- VM_DEFINE_HOOK (SCM_VM_APPLY_HOOK);
+ SCM_VALIDATE_VM (1, vm);
+ return scm_from_int (SCM_VM_DATA (vm)->trace_level);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_exit_hook, "vm-exit-hook", 1, 0, 0,
- (SCM vm),
+SCM_DEFINE (scm_set_vm_trace_level_x, "set-vm-trace-level!", 2, 0, 0,
+ (SCM vm, SCM level),
"")
-#define FUNC_NAME s_scm_vm_exit_hook
+#define FUNC_NAME s_scm_set_vm_trace_level_x
{
- VM_DEFINE_HOOK (SCM_VM_EXIT_HOOK);
+ SCM_VALIDATE_VM (1, vm);
+ SCM_VM_DATA (vm)->trace_level = scm_to_int (level);
+ return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_return_hook, "vm-return-hook", 1, 0, 0,
+\f
+/*
+ * VM engines
+ */
+
+static int
+symbol_to_vm_engine (SCM engine, const char *FUNC_NAME)
+{
+ if (scm_is_eq (engine, sym_regular))
+ return SCM_VM_REGULAR_ENGINE;
+ else if (scm_is_eq (engine, sym_debug))
+ return SCM_VM_DEBUG_ENGINE;
+ else
+ SCM_MISC_ERROR ("Unknown VM engine: ~a", scm_list_1 (engine));
+}
+
+static SCM
+vm_engine_to_symbol (int engine, const char *FUNC_NAME)
+{
+ switch (engine)
+ {
+ case SCM_VM_REGULAR_ENGINE:
+ return sym_regular;
+ case SCM_VM_DEBUG_ENGINE:
+ return sym_debug;
+ default:
+ /* ? */
+ SCM_MISC_ERROR ("Unknown VM engine: ~a",
+ scm_list_1 (scm_from_int (engine)));
+ }
+}
+
+SCM_DEFINE (scm_vm_engine, "vm-engine", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_return_hook
+#define FUNC_NAME s_scm_vm_engine
{
- VM_DEFINE_HOOK (SCM_VM_RETURN_HOOK);
+ SCM_VALIDATE_VM (1, vm);
+ return vm_engine_to_symbol (SCM_VM_DATA (vm)->engine, FUNC_NAME);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_option, "vm-option", 2, 0, 0,
- (SCM vm, SCM key),
- "")
-#define FUNC_NAME s_scm_vm_option
+void
+scm_c_set_vm_engine_x (SCM vm, int engine)
+#define FUNC_NAME "set-vm-engine!"
{
SCM_VALIDATE_VM (1, vm);
- return scm_assq_ref (SCM_VM_DATA (vm)->options, key);
+
+ if (engine < 0 || engine >= SCM_VM_NUM_ENGINES)
+ SCM_MISC_ERROR ("Unknown VM engine: ~a",
+ scm_list_1 (scm_from_int (engine)));
+
+ SCM_VM_DATA (vm)->engine = engine;
}
#undef FUNC_NAME
-SCM_DEFINE (scm_set_vm_option_x, "set-vm-option!", 3, 0, 0,
- (SCM vm, SCM key, SCM val),
+SCM_DEFINE (scm_set_vm_engine_x, "set-vm-engine!", 2, 0, 0,
+ (SCM vm, SCM engine),
"")
-#define FUNC_NAME s_scm_set_vm_option_x
+#define FUNC_NAME s_scm_set_vm_engine_x
{
- SCM_VALIDATE_VM (1, vm);
- SCM_VM_DATA (vm)->options
- = scm_assq_set_x (SCM_VM_DATA (vm)->options, key, val);
+ scm_c_set_vm_engine_x (vm, symbol_to_vm_engine (engine, FUNC_NAME));
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_trace_level, "vm-trace-level", 1, 0, 0,
- (SCM vm),
- "")
-#define FUNC_NAME s_scm_vm_trace_level
+void
+scm_c_set_default_vm_engine_x (int engine)
+#define FUNC_NAME "set-default-vm-engine!"
{
- SCM_VALIDATE_VM (1, vm);
- return scm_from_int (SCM_VM_DATA (vm)->trace_level);
+ if (engine < 0 || engine >= SCM_VM_NUM_ENGINES)
+ SCM_MISC_ERROR ("Unknown VM engine: ~a",
+ scm_list_1 (scm_from_int (engine)));
+
+ vm_default_engine = engine;
}
#undef FUNC_NAME
-SCM_DEFINE (scm_set_vm_trace_level_x, "set-vm-trace-level!", 2, 0, 0,
- (SCM vm, SCM level),
+SCM_DEFINE (scm_set_default_vm_engine_x, "set-default-vm-engine!", 1, 0, 0,
+ (SCM engine),
"")
-#define FUNC_NAME s_scm_set_vm_trace_level_x
+#define FUNC_NAME s_scm_set_default_vm_engine_x
{
- SCM_VALIDATE_VM (1, vm);
- SCM_VM_DATA (vm)->trace_level = scm_to_int (level);
+ scm_c_set_default_vm_engine_x (symbol_to_vm_engine (engine, FUNC_NAME));
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
+static void reinstate_vm (SCM vm)
+{
+ scm_i_thread *t = SCM_I_CURRENT_THREAD;
+ t->vm = vm;
+}
+
+SCM_DEFINE (scm_call_with_vm, "call-with-vm", 2, 0, 1,
+ (SCM vm, SCM proc, SCM args),
+ "Apply @var{proc} to @var{args} in a dynamic extent in which\n"
+ "@var{vm} is the current VM.\n\n"
+ "As an implementation restriction, if @var{vm} is not the same\n"
+ "as the current thread's VM, continuations captured within the\n"
+ "call to @var{proc} may not be reinstated once control leaves\n"
+ "@var{proc}.")
+#define FUNC_NAME s_scm_call_with_vm
+{
+ SCM prev_vm, ret;
+ SCM *argv;
+ int i, nargs;
+ scm_t_wind_flags flags;
+ scm_i_thread *t = SCM_I_CURRENT_THREAD;
+
+ SCM_VALIDATE_VM (1, vm);
+ SCM_VALIDATE_PROC (2, proc);
+
+ nargs = scm_ilength (args);
+ if (SCM_UNLIKELY (nargs < 0))
+ scm_wrong_type_arg_msg (FUNC_NAME, 3, args, "list");
+
+ argv = alloca (nargs * sizeof(SCM));
+ for (i = 0; i < nargs; i++)
+ {
+ argv[i] = SCM_CAR (args);
+ args = SCM_CDR (args);
+ }
+
+ prev_vm = t->vm;
+
+ /* Reentry can happen via invokation of a saved continuation, but
+ continuations only save the state of the VM that they are in at
+ capture-time, which might be different from this one. So, in the
+ case that the VMs are different, set up a non-rewindable frame to
+ prevent reinstating an incomplete continuation. */
+ flags = scm_is_eq (prev_vm, vm) ? 0 : SCM_F_WIND_EXPLICITLY;
+ if (flags)
+ {
+ scm_dynwind_begin (0);
+ scm_dynwind_unwind_handler_with_scm (reinstate_vm, prev_vm, flags);
+ t->vm = vm;
+ }
+
+ ret = scm_c_vm_run (vm, proc, argv, nargs);
+
+ if (flags)
+ scm_dynwind_end ();
+
+ return ret;
+}
+#undef FUNC_NAME
+
\f
/*
* Initialize
void
scm_bootstrap_vm (void)
{
- scm_c_register_extension ("libguile", "scm_init_vm",
+ scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
+ "scm_init_vm",
(scm_t_extension_init_func)scm_init_vm, NULL);
+ sym_vm_run = scm_from_latin1_symbol ("vm-run");
+ sym_vm_error = scm_from_latin1_symbol ("vm-error");
+ sym_keyword_argument_error = scm_from_latin1_symbol ("keyword-argument-error");
+ sym_regular = scm_from_latin1_symbol ("regular");
+ sym_debug = scm_from_latin1_symbol ("debug");
+
#ifdef VM_ENABLE_PRECISE_STACK_GC_SCAN
vm_stack_gc_kind =
GC_new_kind (GC_new_free_list (),
HCoop / bpt / guile.git / blobdiff