-/* 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 "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
/*
continuation root is inside VM code, and call/cc was invoked within that same
call to vm_run; but that's currently not implemented.
*/
-static SCM
-vm_capture_continuation (SCM *stack_base,
- SCM *fp, SCM *sp, scm_t_uint8 *ra, scm_t_uint8 *mvra)
+SCM
+scm_i_vm_capture_stack (SCM *stack_base, SCM *fp, SCM *sp, scm_t_uint8 *ra,
+ scm_t_uint8 *mvra, scm_t_uint32 flags)
{
struct scm_vm_cont *p;
p->fp = fp;
memcpy (p->stack_base, stack_base, (sp + 1 - stack_base) * sizeof (SCM));
p->reloc = p->stack_base - stack_base;
+ p->flags = flags;
return scm_cell (scm_tc7_vm_cont, (scm_t_bits)p);
}
SCM_EOL);
if (vp->stack_size < cp->stack_size + n + 1)
- {
- /* puts ("FIXME: Need to expand"); */
- abort ();
- }
+ 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 - cp->sp);
scm_i_vm_capture_continuation (SCM vm)
{
struct scm_vm *vp = SCM_VM_DATA (vm);
- return vm_capture_continuation (vp->stack_base, vp->fp, vp->sp, vp->ip, NULL);
+ return scm_i_vm_capture_stack (vp->stack_base, vp->fp, vp->sp, vp->ip, NULL, 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;
-
- 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++;
+
+ 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 = PTR2SCM (&c_frame);
+ args[0] = PTR2SCM (frame);
+
+ scm_c_run_hookn (hook, args, 1);
+
+ vp->trace_level = saved_trace_level;
}
-\f
-/*
- * The dynamic stack
- */
-#define VM_SETJMP(jmpbuf) 0
+static void vm_abort (SCM vm, size_t n, scm_t_int64 cookie) SCM_NORETURN;
+static void
+vm_abort (SCM vm, size_t n, scm_t_int64 vm_cookie)
+{
+ size_t i;
+ ssize_t tail_len;
+ SCM tag, tail, *argv;
+
+ /* 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, vm_cookie);
+}
-static void vm_throw (SCM vm, SCM k, SCM args) SCM_NORETURN;
static void
-vm_throw (SCM vm, SCM k, SCM args)
+vm_reinstate_partial_continuation (SCM vm, SCM cont, SCM intwinds,
+ size_t n, SCM *argv, scm_t_int64 vm_cookie)
{
- abort ();
+ struct scm_vm *vp;
+ struct scm_vm_cont *cp;
+ SCM *argv_copy, *base;
+ 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;
+
+#define RELOC(scm_p) \
+ (((SCM *) (scm_p)) + cp->reloc + (base - cp->stack_base))
+
+ 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);
+
+ /* Finally, rewind the dynamic state.
+
+ We have to treat prompts specially, because we could be rewinding the
+ dynamic state from a different thread, or just a different position on the
+ C and/or VM stack -- so we need to reset the jump buffers so that an abort
+ comes back here, with appropriately adjusted sp and fp registers. */
+ {
+ long delta = 0;
+ SCM newwinds = scm_i_dynwinds ();
+ for (; scm_is_pair (intwinds); intwinds = scm_cdr (intwinds), delta--)
+ {
+ SCM x = scm_car (intwinds);
+ if (SCM_PROMPT_P (x))
+ /* the jmpbuf will be reset by our caller */
+ x = scm_c_make_prompt (SCM_PROMPT_TAG (x),
+ RELOC (SCM_PROMPT_REGISTERS (x)->fp),
+ RELOC (SCM_PROMPT_REGISTERS (x)->sp),
+ SCM_PROMPT_REGISTERS (x)->ip,
+ SCM_PROMPT_ESCAPE_P (x),
+ vm_cookie,
+ newwinds);
+ newwinds = scm_cons (x, newwinds);
+ }
+ scm_dowinds (newwinds, delta);
+ }
+#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)
{
+ const struct scm_vm *vm;
+
+ vm = SCM_VM_DATA (x);
+
scm_puts ("#<vm ", port);
+ switch (vm->engine)
+ {
+ case SCM_VM_REGULAR_ENGINE:
+ scm_puts ("regular-engine ", port);
+ break;
+
+ case SCM_VM_DEBUG_ENGINE:
+ scm_puts ("debug-engine ", port);
+ break;
+
+ default:
+ scm_puts ("unknown-engine ", port);
+ }
scm_uintprint (SCM_UNPACK (x), 16, port);
scm_puts (">", port);
}
-static SCM
-really_make_boot_program (long nargs)
+\f
+/*
+ * VM Error Handling
+ */
+
+static void vm_error (const char *msg, SCM arg) SCM_NORETURN;
+static void vm_error_bad_instruction (scm_t_uint32 inst) SCM_NORETURN;
+static void vm_error_unbound (SCM proc, SCM sym) SCM_NORETURN;
+static void vm_error_unbound_fluid (SCM proc, SCM fluid) SCM_NORETURN;
+static void vm_error_not_a_variable (const char *func_name, SCM x) SCM_NORETURN;
+static void vm_error_not_a_thunk (const char *func_name, SCM x) SCM_NORETURN;
+static void vm_error_apply_to_non_list (SCM x) SCM_NORETURN;
+static void vm_error_kwargs_length_not_even (SCM proc) SCM_NORETURN;
+static void vm_error_kwargs_invalid_keyword (SCM proc) SCM_NORETURN;
+static void vm_error_kwargs_unrecognized_keyword (SCM proc) SCM_NORETURN;
+static void vm_error_too_many_args (int nargs) SCM_NORETURN;
+static void vm_error_wrong_num_args (SCM proc) SCM_NORETURN;
+static void vm_error_wrong_type_apply (SCM proc) SCM_NORETURN;
+static void vm_error_stack_overflow (struct scm_vm *vp) SCM_NORETURN;
+static void vm_error_stack_underflow (void) SCM_NORETURN;
+static void vm_error_improper_list (SCM x) SCM_NORETURN;
+static void vm_error_not_a_pair (const char *subr, SCM x) SCM_NORETURN;
+static void vm_error_not_a_bytevector (const char *subr, SCM x) SCM_NORETURN;
+static void vm_error_not_a_struct (const char *subr, SCM x) SCM_NORETURN;
+static void vm_error_no_values (void) SCM_NORETURN;
+static void vm_error_not_enough_values (void) SCM_NORETURN;
+static void vm_error_continuation_not_rewindable (SCM cont) SCM_NORETURN;
+static void vm_error_bad_wide_string_length (size_t len) SCM_NORETURN;
+#if VM_CHECK_IP
+static void vm_error_invalid_address (void) SCM_NORETURN;
+#endif
+#if VM_CHECK_OBJECT
+static void vm_error_object (void) SCM_NORETURN;
+#endif
+#if VM_CHECK_FREE_VARIABLES
+static void vm_error_free_variable (void) SCM_NORETURN;
+#endif
+
+static void
+vm_error (const char *msg, SCM arg)
{
- SCM u8vec;
- scm_t_uint8 text[] = { scm_op_mv_call, 0, 0, 0, 1,
- scm_op_make_int8_1, scm_op_halt };
- struct scm_objcode *bp;
- SCM ret;
+ scm_throw (sym_vm_error,
+ scm_list_3 (sym_vm_run, scm_from_latin1_string (msg),
+ SCM_UNBNDP (arg) ? SCM_EOL : scm_list_1 (arg)));
+ abort(); /* not reached */
+}
- if (SCM_UNLIKELY (nargs > 255 || nargs < 0))
- abort ();
- text[1] = (scm_t_uint8)nargs;
+static void
+vm_error_bad_instruction (scm_t_uint32 inst)
+{
+ vm_error ("VM: Bad instruction: ~s", scm_from_uint32 (inst));
+}
- bp = scm_malloc (sizeof (struct scm_objcode) + sizeof (text));
- memcpy (SCM_C_OBJCODE_BASE (bp), text, sizeof (text));
- bp->len = sizeof(text);
- bp->metalen = 0;
+static void
+vm_error_unbound (SCM proc, SCM sym)
+{
+ scm_error_scm (scm_misc_error_key, proc,
+ scm_from_latin1_string ("Unbound variable: ~s"),
+ scm_list_1 (sym), SCM_BOOL_F);
+}
- u8vec = scm_c_take_bytevector ((scm_t_int8*)bp,
- sizeof (struct scm_objcode) + sizeof (text));
- ret = scm_make_program (scm_bytecode_to_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 void
+vm_error_unbound_fluid (SCM proc, SCM fluid)
+{
+ scm_error_scm (scm_misc_error_key, proc,
+ scm_from_latin1_string ("Unbound fluid: ~s"),
+ scm_list_1 (fluid), SCM_BOOL_F);
+}
- return ret;
+static void
+vm_error_not_a_variable (const char *func_name, SCM x)
+{
+ scm_error (scm_arg_type_key, func_name, "Not a variable: ~S",
+ scm_list_1 (x), scm_list_1 (x));
}
-#define NUM_BOOT_PROGS 8
-static SCM
-vm_make_boot_program (long nargs)
+
+static void
+vm_error_not_a_thunk (const char *func_name, SCM x)
{
- static SCM programs[NUM_BOOT_PROGS] = { 0, };
+ scm_error (scm_arg_type_key, func_name, "Not a thunk: ~S",
+ scm_list_1 (x), scm_list_1 (x));
+}
- if (SCM_UNLIKELY (!programs[0]))
- {
- int i;
- for (i = 0; i < NUM_BOOT_PROGS; i++)
- programs[i] = really_make_boot_program (i);
- }
-
- if (SCM_LIKELY (nargs < NUM_BOOT_PROGS))
- return programs[nargs];
+static void
+vm_error_apply_to_non_list (SCM x)
+{
+ scm_error (scm_arg_type_key, "apply", "Apply to non-list: ~S",
+ scm_list_1 (x), scm_list_1 (x));
+}
+
+static void
+vm_error_kwargs_length_not_even (SCM proc)
+{
+ scm_error_scm (sym_keyword_argument_error, proc,
+ scm_from_latin1_string ("Odd length of keyword argument list"),
+ SCM_EOL, SCM_BOOL_F);
+}
+
+static void
+vm_error_kwargs_invalid_keyword (SCM proc)
+{
+ scm_error_scm (sym_keyword_argument_error, proc,
+ scm_from_latin1_string ("Invalid keyword"),
+ SCM_EOL, SCM_BOOL_F);
+}
+
+static void
+vm_error_kwargs_unrecognized_keyword (SCM proc)
+{
+ scm_error_scm (sym_keyword_argument_error, proc,
+ scm_from_latin1_string ("Unrecognized keyword"),
+ SCM_EOL, SCM_BOOL_F);
+}
+
+static void
+vm_error_too_many_args (int nargs)
+{
+ vm_error ("VM: Too many arguments", scm_from_int (nargs));
+}
+
+static void
+vm_error_wrong_num_args (SCM proc)
+{
+ scm_wrong_num_args (proc);
+}
+
+static void
+vm_error_wrong_type_apply (SCM proc)
+{
+ scm_error (scm_arg_type_key, NULL, "Wrong type to apply: ~S",
+ scm_list_1 (proc), scm_list_1 (proc));
+}
+
+static void
+vm_error_stack_overflow (struct scm_vm *vp)
+{
+ if (vp->stack_limit < vp->stack_base + vp->stack_size)
+ /* There are VM_STACK_RESERVE_SIZE bytes left. Make them available so
+ that `throw' below can run on this VM. */
+ vp->stack_limit = vp->stack_base + vp->stack_size;
else
- return really_make_boot_program (nargs);
+ /* There is no space left on the stack. FIXME: Do something more
+ sensible here! */
+ abort ();
+ vm_error ("VM: Stack overflow", SCM_UNDEFINED);
+}
+
+static void
+vm_error_stack_underflow (void)
+{
+ vm_error ("VM: Stack underflow", SCM_UNDEFINED);
+}
+
+static void
+vm_error_improper_list (SCM x)
+{
+ vm_error ("Expected a proper list, but got object with tail ~s", x);
+}
+
+static void
+vm_error_not_a_pair (const char *subr, SCM x)
+{
+ scm_wrong_type_arg_msg (subr, 1, x, "pair");
+}
+
+static void
+vm_error_not_a_bytevector (const char *subr, SCM x)
+{
+ scm_wrong_type_arg_msg (subr, 1, x, "bytevector");
+}
+
+static void
+vm_error_not_a_struct (const char *subr, SCM x)
+{
+ scm_wrong_type_arg_msg (subr, 1, x, "struct");
+}
+
+static void
+vm_error_no_values (void)
+{
+ vm_error ("Zero values returned to single-valued continuation",
+ SCM_UNDEFINED);
+}
+
+static void
+vm_error_not_enough_values (void)
+{
+ vm_error ("Too few values returned to continuation", SCM_UNDEFINED);
+}
+
+static void
+vm_error_continuation_not_rewindable (SCM cont)
+{
+ vm_error ("Unrewindable partial continuation", cont);
+}
+
+static void
+vm_error_bad_wide_string_length (size_t len)
+{
+ vm_error ("VM: Bad wide string length: ~S", scm_from_size_t (len));
+}
+
+#ifdef VM_CHECK_IP
+static void
+vm_error_invalid_address (void)
+{
+ vm_error ("VM: Invalid program address", SCM_UNDEFINED);
+}
+#endif
+
+#if VM_CHECK_OBJECT
+static void
+vm_error_object ()
+{
+ vm_error ("VM: Invalid object table access", SCM_UNDEFINED);
+}
+#endif
+
+#if VM_CHECK_FREE_VARIABLES
+static void
+vm_error_free_variable ()
+{
+ vm_error ("VM: Invalid free variable access", SCM_UNDEFINED);
}
+#endif
+
+\f
+
+static SCM boot_continuation;
\f
/*
#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;
+ vp->cookie = 0;
return scm_cell (scm_tc7_vm, (scm_t_bits)vp);
}
#undef FUNC_NAME
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_boot_hook
+#define FUNC_NAME s_scm_vm_apply_hook
{
- VM_DEFINE_HOOK (SCM_VM_BOOT_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_APPLY_HOOK);
}
#undef FUNC_NAME
-SCM_DEFINE (scm_vm_halt_hook, "vm-halt-hook", 1, 0, 0,
+SCM_DEFINE (scm_vm_push_continuation_hook, "vm-push-continuation-hook", 1, 0, 0,
(SCM vm),
"")
-#define FUNC_NAME s_scm_vm_halt_hook
+#define FUNC_NAME s_scm_vm_push_continuation_hook
{
- VM_DEFINE_HOOK (SCM_VM_HALT_HOOK);
+ VM_DEFINE_HOOK (SCM_VM_PUSH_CONTINUATION_HOOK);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_vm_pop_continuation_hook, "vm-pop-continuation-hook", 1, 0, 0,
+ (SCM vm),
+ "")
+#define FUNC_NAME s_scm_vm_pop_continuation_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
return scm_c_vm_run (scm_the_vm (), program, NULL, 0);
}
+
+static SCM
+make_boot_program (void)
+{
+ struct scm_objcode *bp;
+ size_t bp_size;
+ SCM u8vec, ret;
+
+ const scm_t_uint8 text[] = {
+ scm_op_make_int8_1,
+ scm_op_halt
+ };
+
+ bp_size = sizeof (struct scm_objcode) + sizeof (text);
+ bp = scm_gc_malloc_pointerless (bp_size, "boot-program");
+ memcpy (SCM_C_OBJCODE_BASE (bp), text, sizeof (text));
+ bp->len = sizeof(text);
+ bp->metalen = 0;
+
+ u8vec = scm_c_take_gc_bytevector ((scm_t_int8*)bp, bp_size);
+ 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));
+
+ return ret;
+}
+
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");
+
+ boot_continuation = make_boot_program ();
+
#ifdef VM_ENABLE_PRECISE_STACK_GC_SCAN
vm_stack_gc_kind =
GC_new_kind (GC_new_free_list (),
HCoop / bpt / guile.git / blobdiff