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Continuations capture machine code address

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* libguile/continuations.c (scm_i_continuation_to_frame): Adapt to vra
  field renaming.
  (scm_i_reinstate_continuation, grow_stack, copy_stack_and_call)
  (scm_dynthrow): Take mra of continuation.  Set on the vp before the
  longjmp.
* libguile/continuations.h: Update scm_i_reinstate_continuation
  prototype.
* libguile/dynstack.h:
* libguile/control.c (scm_suspendable_continuation_p):
* libguile/dynstack.c (PROMPT_WORDS, PROMPT_VRA, PROMPT_MRA):
  (PROMPT_JMPBUF, scm_dynstack_push_prompt, scm_dynstack_find_prompt)
  (scm_dynstack_wind_prompt): Store both virtual and machine return
  addresses on the dynstack, for prompts.
* libguile/eval.c (eval): Pass NULL for mra.
* libguile/intrinsics.c (push_prompt): Add mra arg, and pass it to the
  dynstack.
* libguile/intrinsics.h: Update prototypes so that continuation-related
  intrinsics can save and restore the MRA.
* libguile/jit.h:
* libguile/jit.c: Return VRA when JIT code needs to tier down.
* libguile/stacks.c (find_prompt, scm_make_stack)
* libguile/throw.c (catch): Adapt find-prompt calls.
* libguile/vm-engine.c (instrument-entry, instrument-loop): Add logic to
  continue with vcode after the mcode finishes.
  (compose-continuation, capture-continuation, abort, prompt): Add logic
  to pass NULL as captured MRA, but continue with mcode from new
  continuations, if appropriate.
* libguile/vm.c (scm_i_vm_cont_to_frame, capture_stack)
  (scm_i_capture_current_stack, reinstate_continuation_x)
  (capture_continuation, compose_continuation_inner, compose_continuation)
  (capture_delimited_continuation, abort_to_prompt): Adapt to plumb
  around machine code continuations.
  (scm_call_n): Check "mra_after_abort" field for machine code
  continuation, if any.
* libguile/vm.h (struct scm_vm): Add "mra_after_abort" field.
  (struct scm_vm_cont): Rename "ra" field to "vra" and add "mra" field.
This commit is contained in:
Andy Wingo 2018-08-12 15:57:53 +02:00
parent 939b1ae23f
commit a20feea43e
15 changed files with 149 additions and 92 deletions
Download patch file Download diff file Expand all files Collapse all files

21
libguile/continuations.c
View file

@ -228,7 +228,7 @@ scm_i_continuation_to_frame (SCM continuation, struct scm_frame *frame)
frame->stack_holder = data;
frame->fp_offset = data->fp_offset;
frame->sp_offset = data->stack_size;
frame->ip = data->ra;
frame->ip = data->vra;
return 1;
}
@ -261,7 +261,7 @@ scm_i_contregs (SCM contregs)
* with their correct stack.
*/
static void scm_dynthrow (SCM);
static void scm_dynthrow (SCM, uint8_t *);
/* Grow the stack by a fixed amount to provide space to copy in the
* continuation. Possibly this function has to be called several times
@ -273,12 +273,12 @@ static void scm_dynthrow (SCM);
static scm_t_bits scm_i_dummy;
static void
grow_stack (SCM cont)
grow_stack (SCM cont, uint8_t *mra)
{
scm_t_bits growth[100];
scm_i_dummy = (scm_t_bits) growth;
scm_dynthrow (cont);
scm_dynthrow (cont, mra);
}
@ -289,7 +289,7 @@ grow_stack (SCM cont)
static void
copy_stack_and_call (scm_t_contregs *continuation,
SCM_STACKITEM * dst)
SCM_STACKITEM * dst, uint8_t *mra)
{
scm_t_dynstack *dynstack;
scm_t_bits *joint;
@ -305,6 +305,7 @@ copy_stack_and_call (scm_t_contregs *continuation,
scm_dynstack_wind (&thread->dynstack, joint);
thread->vm.mra_after_abort = mra;
longjmp (continuation->jmpbuf, 1);
}
@ -313,7 +314,7 @@ copy_stack_and_call (scm_t_contregs *continuation,
* actual copying and continuation calling.
*/
static void
scm_dynthrow (SCM cont)
scm_dynthrow (SCM cont, uint8_t *mra)
{
scm_thread *thread = SCM_I_CURRENT_THREAD;
scm_t_contregs *continuation = SCM_CONTREGS (cont);
@ -326,17 +327,17 @@ scm_dynthrow (SCM cont)
#else
dst -= continuation->num_stack_items;
if (dst <= &stack_top_element)
grow_stack (cont);
grow_stack (cont, mra);
#endif /* def SCM_STACK_GROWS_UP */
SCM_FLUSH_REGISTER_WINDOWS;
copy_stack_and_call (continuation, dst);
copy_stack_and_call (continuation, dst, mra);
}
void
scm_i_reinstate_continuation (SCM cont)
scm_i_reinstate_continuation (SCM cont, uint8_t *mra)
{
scm_dynthrow (cont);
scm_dynthrow (cont, mra);
abort (); /* Unreachable. */
}

3
libguile/continuations.h
View file

@ -68,7 +68,8 @@ typedef struct
SCM_INTERNAL SCM scm_i_make_continuation (scm_thread *thread, SCM vm_cont);
SCM_INTERNAL void scm_i_reinstate_continuation (SCM cont) SCM_NORETURN;
SCM_INTERNAL void scm_i_reinstate_continuation (SCM cont,
uint8_t *mra) SCM_NORETURN;
SCM_INTERNAL int scm_i_continuation_to_frame (SCM cont,
struct scm_frame *frame);

2
libguile/control.c
View file

@ -138,7 +138,7 @@ scm_suspendable_continuation_p (SCM tag)
jmp_buf *registers;
if (scm_dynstack_find_prompt (&thread->dynstack, tag, &flags,
NULL, NULL, NULL, &registers))
NULL, NULL, NULL, NULL, &registers))
return scm_from_bool (registers == thread->vm.registers);
return SCM_BOOL_F;

25
libguile/dynstack.c
View file

@ -38,14 +38,15 @@
#define PROMPT_WORDS 5
#define PROMPT_WORDS 6
#define PROMPT_KEY(top) (SCM_PACK ((top)[0]))
#define PROMPT_FP(top) ((ptrdiff_t) ((top)[1]))
#define SET_PROMPT_FP(top, fp) do { top[1] = (scm_t_bits)(fp); } while (0)
#define PROMPT_SP(top) ((ptrdiff_t) ((top)[2]))
#define SET_PROMPT_SP(top, sp) do { top[2] = (scm_t_bits)(sp); } while (0)
#define PROMPT_IP(top) ((uint32_t *) ((top)[3]))
#define PROMPT_JMPBUF(top) ((jmp_buf *) ((top)[4]))
#define PROMPT_VRA(top) ((uint32_t *) ((top)[3]))
#define PROMPT_MRA(top) ((uint8_t *) ((top)[4]))
#define PROMPT_JMPBUF(top) ((jmp_buf *) ((top)[5]))
#define WINDER_WORDS 2
#define WINDER_PROC(top) ((scm_t_guard) ((top)[0]))
@ -197,7 +198,7 @@ scm_dynstack_push_prompt (scm_t_dynstack *dynstack,
scm_t_dynstack_prompt_flags flags,
SCM key,
ptrdiff_t fp_offset, ptrdiff_t sp_offset,
uint32_t *ip, jmp_buf *registers)
uint32_t *vra, uint8_t *mra, jmp_buf *registers)
{
scm_t_bits *words;
@ -206,8 +207,9 @@ scm_dynstack_push_prompt (scm_t_dynstack *dynstack,
words[0] = SCM_UNPACK (key);
words[1] = (scm_t_bits) fp_offset;
words[2] = (scm_t_bits) sp_offset;
words[3] = (scm_t_bits) ip;
words[4] = (scm_t_bits) registers;
words[3] = (scm_t_bits) vra;
words[4] = (scm_t_bits) mra;
words[5] = (scm_t_bits) registers;
}
void
@ -500,7 +502,7 @@ scm_t_bits*
scm_dynstack_find_prompt (scm_t_dynstack *dynstack, SCM key,
scm_t_dynstack_prompt_flags *flags,
ptrdiff_t *fp_offset, ptrdiff_t *sp_offset,
uint32_t **ip, jmp_buf **registers)
uint32_t **vra, uint8_t **mra, jmp_buf **registers)
{
scm_t_bits *walk;
@ -518,8 +520,10 @@ scm_dynstack_find_prompt (scm_t_dynstack *dynstack, SCM key,
*fp_offset = PROMPT_FP (walk);
if (sp_offset)
*sp_offset = PROMPT_SP (walk);
if (ip)
*ip = PROMPT_IP (walk);
if (vra)
*vra = PROMPT_VRA (walk);
if (mra)
*mra = PROMPT_MRA (walk);
if (registers)
*registers = PROMPT_JMPBUF (walk);
return walk;
@ -593,7 +597,8 @@ scm_dynstack_wind_prompt (scm_t_dynstack *dynstack, scm_t_bits *item,
PROMPT_KEY (item),
PROMPT_FP (item) + base_fp_offset,
PROMPT_SP (item) + base_fp_offset,
PROMPT_IP (item),
PROMPT_VRA (item),
PROMPT_MRA (item),
registers);
}

4
libguile/dynstack.h
View file

@ -160,7 +160,8 @@ SCM_INTERNAL void scm_dynstack_push_prompt (scm_t_dynstack *,
SCM key,
ptrdiff_t fp_offset,
ptrdiff_t sp_offset,
uint32_t *ip,
uint32_t *vra,
uint8_t *mra,
jmp_buf *registers);
SCM_INTERNAL void scm_dynstack_push_dynwind (scm_t_dynstack *,
SCM enter, SCM leave);
@ -201,6 +202,7 @@ SCM_INTERNAL scm_t_bits* scm_dynstack_find_prompt (scm_t_dynstack *, SCM,
ptrdiff_t *,
ptrdiff_t *,
uint32_t **,
uint8_t **,
jmp_buf **);
SCM_INTERNAL SCM scm_dynstack_find_old_fluid_value (scm_t_dynstack *,

3
libguile/eval.c
View file

@ -441,6 +441,7 @@ eval (SCM x, SCM env)
jmp_buf registers;
jmp_buf *prev_registers;
ptrdiff_t saved_stack_depth;
uint8_t *mra = NULL;
k = EVAL1 (CAR (mx), env);
handler = EVAL1 (CDDR (mx), env);
@ -454,7 +455,7 @@ eval (SCM x, SCM env)
k,
t->vm.stack_top - t->vm.fp,
saved_stack_depth,
t->vm.ip,
t->vm.ip, mra,
&registers);
prev_registers = t->vm.registers;

5
libguile/intrinsics.c
View file

@ -349,7 +349,8 @@ current_module (scm_thread *thread)
static void
push_prompt (scm_thread *thread, uint8_t escape_only_p,
SCM tag, const union scm_vm_stack_element *sp, uint32_t *ra)
SCM tag, const union scm_vm_stack_element *sp, uint32_t *vra,
uint8_t *mra)
{
struct scm_vm *vp = &thread->vm;
scm_t_dynstack_prompt_flags flags;
@ -357,7 +358,7 @@ push_prompt (scm_thread *thread, uint8_t escape_only_p,
flags = escape_only_p ? SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY : 0;
scm_dynstack_push_prompt (&thread->dynstack, flags, tag,
vp->stack_top - vp->fp, vp->stack_top - sp,
ra, thread->vm.registers);
vra, mra, thread->vm.registers);
}
void

15
libguile/intrinsics.h
View file

@ -61,12 +61,15 @@ typedef void (*scm_t_scm_noreturn_intrinsic) (SCM) SCM_NORETURN;
typedef void (*scm_t_u32_noreturn_intrinsic) (uint32_t) SCM_NORETURN;
typedef SCM (*scm_t_scm_from_thread_u64_intrinsic) (scm_thread*, uint64_t);
typedef SCM (*scm_t_scm_from_thread_intrinsic) (scm_thread*);
typedef void (*scm_t_thread_u8_scm_sp_vra_intrinsic) (scm_thread*,
typedef void (*scm_t_thread_u8_scm_sp_vra_mra_intrinsic) (scm_thread*,
uint8_t, SCM,
const union scm_vm_stack_element*,
uint32_t*);
uint32_t*, uint8_t*);
typedef void (*scm_t_thread_mra_intrinsic) (scm_thread*, uint8_t*);
typedef uint32_t* (*scm_t_vra_from_thread_intrinsic) (scm_thread*);
typedef uint8_t* (*scm_t_mra_from_thread_scm_intrinsic) (scm_thread*, SCM);
typedef uint8_t* (*scm_t_mra_from_thread_mra_intrinsic) (scm_thread*, uint8_t*);
typedef SCM (*scm_t_scm_from_thread_mra_intrinsic) (scm_thread*, uint8_t*);
#define SCM_FOR_ALL_VM_INTRINSICS(M) \
M(scm_from_scm_scm, add, "add", ADD) \
@ -118,10 +121,10 @@ typedef uint32_t* (*scm_t_vra_from_thread_intrinsic) (scm_thread*);
M(thread_mra, push_interrupt_frame, "push-interrupt-frame", PUSH_INTERRUPT_FRAME) \
M(thread_scm_scm, foreign_call, "foreign-call", FOREIGN_CALL) \
M(thread_scm_noreturn, reinstate_continuation_x, "reinstate-continuation!", REINSTATE_CONTINUATION_X) \
M(scm_from_thread, capture_continuation, "capture-continuation", CAPTURE_CONTINUATION) \
M(thread_scm, compose_continuation, "compose-continuation", COMPOSE_CONTINUATION) \
M(scm_from_thread_mra, capture_continuation, "capture-continuation", CAPTURE_CONTINUATION) \
M(mra_from_thread_scm, compose_continuation, "compose-continuation", COMPOSE_CONTINUATION) \
M(int_from_scm, rest_arg_length, "rest-arg-length", REST_ARG_LENGTH) \
M(thread, abort_to_prompt, "abort-to-prompt", ABORT_TO_PROMPT) \
M(mra_from_thread_mra, abort_to_prompt, "abort-to-prompt", ABORT_TO_PROMPT) \
M(scm_scm_noreturn, throw_, "throw", THROW) \
M(scm_scm_noreturn, throw_with_value, "throw/value", THROW_WITH_VALUE) \
M(scm_scm_noreturn, throw_with_value_and_data, "throw/value+data", THROW_WITH_VALUE_AND_DATA) \
@ -132,7 +135,7 @@ typedef uint32_t* (*scm_t_vra_from_thread_intrinsic) (scm_thread*);
M(vra_from_thread, get_callee_vcode, "get-callee-vcode", GET_CALLEE_VCODE) \
M(scm_from_thread_u64, allocate_words, "allocate-words", ALLOCATE_WORDS) \
M(scm_from_thread, current_module, "current-module", CURRENT_MODULE) \
M(thread_u8_scm_sp_vra, push_prompt, "push-prompt", PUSH_PROMPT) \
M(thread_u8_scm_sp_vra_mra, push_prompt, "push-prompt", PUSH_PROMPT) \
M(thread_scm, unpack_values_object, "unpack-values-object", UNPACK_VALUES_OBJECT) \
M(thread, invoke_apply_hook, "invoke-apply-hook", INVOKE_APPLY_HOOK) \
M(thread, invoke_return_hook, "invoke-return-hook", INVOKE_RETURN_HOOK) \

3
libguile/jit.c
View file

@ -1215,10 +1215,11 @@ scm_jit_compute_mcode (scm_thread *thread, struct scm_jit_function_data *data)
return NULL;
}
void
uint32_t *
scm_jit_enter_mcode (scm_thread *thread, const uint8_t *mcode)
{
abort ();
return NULL;
}
void

3
libguile/jit.h
View file

@ -53,7 +53,8 @@ enum scm_jit_counter_value
SCM_INTERNAL const uint8_t *scm_jit_compute_mcode (scm_thread *thread,
struct scm_jit_function_data *data);
SCM_INTERNAL void scm_jit_enter_mcode (scm_thread *thread, const uint8_t *mcode);
SCM_INTERNAL uint32_t *scm_jit_enter_mcode (scm_thread *thread,
const uint8_t *mcode);
SCM_INTERNAL void scm_init_jit (void);

4
libguile/stacks.c
View file

@ -108,7 +108,7 @@ find_prompt (SCM key)
ptrdiff_t fp_offset;
if (!scm_dynstack_find_prompt (&SCM_I_CURRENT_THREAD->dynstack, key,
NULL, &fp_offset, NULL, NULL, NULL))
NULL, &fp_offset, NULL, NULL, NULL, NULL))
scm_misc_error ("make-stack", "Prompt tag not found while narrowing stack",
scm_list_1 (key));
@ -334,7 +334,7 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
frame.stack_holder = c;
frame.fp_offset = c->fp_offset;
frame.sp_offset = c->stack_size;
frame.ip = c->ra;
frame.ip = c->vra;
}
else if (SCM_VM_FRAME_P (obj))
{

2
libguile/throw.c
View file

@ -88,6 +88,7 @@ catch (SCM tag, SCM thunk, SCM handler, SCM pre_unwind_handler)
jmp_buf registers;
jmp_buf *prev_registers;
ptrdiff_t saved_stack_depth;
uint8_t *mra = NULL;
if (!scm_is_eq (tag, SCM_BOOL_T) && !scm_is_symbol (tag))
scm_wrong_type_arg ("catch", 1, tag);
@ -119,6 +120,7 @@ catch (SCM tag, SCM thunk, SCM handler, SCM pre_unwind_handler)
t->vm.stack_top - t->vm.fp,
saved_stack_depth,
t->vm.ip,
mra,
&registers);
scm_dynstack_push_fluid (dynstack, exception_handler_fluid, eh,
dynamic_state);

44
libguile/vm-engine.c
View file

@ -472,8 +472,8 @@ VM_NAME (scm_thread *thread)
if (mcode)
{
scm_jit_enter_mcode (thread, mcode);
CACHE_REGISTER ();
ip = scm_jit_enter_mcode (thread, mcode);
CACHE_SP ();
NEXT (0);
}
}
@ -672,15 +672,26 @@ VM_NAME (scm_thread *thread)
{
SCM vmcont;
uint32_t cont_idx;
uint8_t *mcode;
UNPACK_24 (op, cont_idx);
vmcont = SCM_PROGRAM_FREE_VARIABLE_REF (FP_REF (0), cont_idx);
SYNC_IP ();
CALL_INTRINSIC (compose_continuation, (thread, vmcont));
mcode = CALL_INTRINSIC (compose_continuation, (thread, vmcont));
if (mcode)
{
ip = scm_jit_enter_mcode (thread, mcode);
CACHE_SP ();
NEXT (0);
}
else
{
CACHE_REGISTER ();
NEXT (0);
}
}
/* instrument-loop _:24 data:32
*
@ -705,8 +716,8 @@ VM_NAME (scm_thread *thread)
if (mcode)
{
scm_jit_enter_mcode (thread, mcode);
CACHE_REGISTER ();
ip = scm_jit_enter_mcode (thread, mcode);
CACHE_SP ();
NEXT (0);
}
}
@ -724,11 +735,12 @@ VM_NAME (scm_thread *thread)
VM_DEFINE_OP (15, capture_continuation, "capture-continuation", DOP1 (X8_S24))
{
uint32_t dst;
uint8_t *mra = NULL;
UNPACK_24 (op, dst);
SYNC_IP ();
SP_SET (dst, CALL_INTRINSIC (capture_continuation, (thread)));
SP_SET (dst, CALL_INTRINSIC (capture_continuation, (thread, mra)));
NEXT (1);
}
@ -741,20 +753,33 @@ VM_NAME (scm_thread *thread)
*/
VM_DEFINE_OP (16, abort, "abort", OP1 (X32))
{
uint8_t *mcode = NULL;
/* FIXME: Really we should capture the caller's registers. Until
then, manually advance the IP so that when the prompt resumes,
it continues with the next instruction. */
ip++;
SYNC_IP ();
CALL_INTRINSIC (abort_to_prompt, (thread));
mcode = CALL_INTRINSIC (abort_to_prompt, (thread, mcode));
/* If abort_to_prompt returned, that means there were no
intervening C frames to jump over, so we just continue
directly. */
CACHE_REGISTER ();
ABORT_CONTINUATION_HOOK ();
if (mcode)
{
ip = scm_jit_enter_mcode (thread, mcode);
CACHE_SP ();
NEXT (0);
}
else
{
CACHE_REGISTER ();
NEXT (0);
}
}
/* builtin-ref dst:12 idx:12
*
@ -1623,6 +1648,7 @@ VM_NAME (scm_thread *thread)
uint32_t tag, proc_slot;
int32_t offset;
uint8_t escape_only_p;
uint8_t *mra = NULL;
UNPACK_24 (op, tag);
escape_only_p = ip[1] & 0x1;
@ -1633,7 +1659,7 @@ VM_NAME (scm_thread *thread)
/* Push the prompt onto the dynamic stack. */
SYNC_IP ();
CALL_INTRINSIC (push_prompt, (thread, escape_only_p, SP_REF (tag),
VP->fp - proc_slot, ip + offset));
VP->fp - proc_slot, ip + offset, mra));
NEXT (3);
}

66
libguile/vm.c
View file

@ -153,7 +153,7 @@ scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame)
frame->stack_holder = data;
frame->fp_offset = data->fp_offset;
frame->sp_offset = data->stack_size;
frame->ip = data->ra;
frame->ip = data->vra;
return 1;
}
@ -161,10 +161,12 @@ scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame)
/* 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. That's currently not implemented. */
SCM
scm_i_vm_capture_stack (union scm_vm_stack_element *stack_top,
static SCM
capture_stack (union scm_vm_stack_element *stack_top,
union scm_vm_stack_element *fp,
union scm_vm_stack_element *sp, uint32_t *ra,
union scm_vm_stack_element *sp,
uint32_t *vra,
uint8_t *mra,
scm_t_dynstack *dynstack, uint32_t flags)
{
struct scm_vm_cont *p;
@ -173,7 +175,8 @@ scm_i_vm_capture_stack (union scm_vm_stack_element *stack_top,
p->stack_size = stack_top - sp;
p->stack_bottom = scm_gc_malloc (p->stack_size * sizeof (*p->stack_bottom),
"capture_vm_cont");
p->ra = ra;
p->vra = vra;
p->mra = mra;
p->fp_offset = stack_top - fp;
memcpy (p->stack_bottom, sp, p->stack_size * sizeof (*p->stack_bottom));
p->dynstack = dynstack;
@ -190,7 +193,7 @@ scm_i_capture_current_stack (void)
thread = SCM_I_CURRENT_THREAD;
vp = &thread->vm;
return scm_i_vm_capture_stack (vp->stack_top, vp->fp, vp->sp, vp->ip,
return capture_stack (vp->stack_top, vp->fp, vp->sp, vp->ip, NULL,
scm_dynstack_capture_all (&thread->dynstack),
0);
}
@ -1077,20 +1080,20 @@ reinstate_continuation_x (scm_thread *thread, SCM cont)
vp->sp[n+i].as_scm = SCM_BOOL_F;
memcpy(vp->sp, argv, n * sizeof (union scm_vm_stack_element));
vp->ip = cp->ra;
vp->ip = cp->vra;
scm_i_reinstate_continuation (cont);
scm_i_reinstate_continuation (cont, cp->mra);
}
static SCM
capture_continuation (scm_thread *thread)
capture_continuation (scm_thread *thread, uint8_t *mra)
{
struct scm_vm *vp = &thread->vm;
SCM vm_cont =
scm_i_vm_capture_stack (vp->stack_top,
SCM vm_cont = capture_stack (vp->stack_top,
SCM_FRAME_DYNAMIC_LINK (vp->fp),
SCM_FRAME_PREVIOUS_SP (vp->fp),
SCM_FRAME_VIRTUAL_RETURN_ADDRESS (vp->fp),
SCM_FRAME_MACHINE_RETURN_ADDRESS (vp->fp),
scm_dynstack_capture_all (&thread->dynstack),
0);
return scm_i_make_continuation (thread, vm_cont);
@ -1114,12 +1117,12 @@ compose_continuation_inner (void *data_ptr)
cp->stack_size * sizeof (*cp->stack_bottom));
vp->fp -= cp->fp_offset;
vp->ip = cp->ra;
vp->ip = cp->vra;
return NULL;
return cp->mra;
}
static void
static uint8_t*
compose_continuation (scm_thread *thread, SCM cont)
{
struct scm_vm *vp = &thread->vm;
@ -1128,6 +1131,7 @@ compose_continuation (scm_thread *thread, SCM cont)
struct scm_vm_cont *cp;
union scm_vm_stack_element *args;
ptrdiff_t old_fp_offset;
uint8_t *mra;
if (SCM_UNLIKELY (! SCM_VM_CONT_REWINDABLE_P (cont)))
scm_wrong_type_arg_msg (NULL, 0, cont, "resumable continuation");
@ -1144,7 +1148,7 @@ compose_continuation (scm_thread *thread, SCM cont)
data.vp = vp;
data.cp = cp;
GC_call_with_alloc_lock (compose_continuation_inner, &data);
mra = GC_call_with_alloc_lock (compose_continuation_inner, &data);
/* The resumed continuation will expect ARGS on the stack as if from a
multiple-value return. */
@ -1169,6 +1173,8 @@ compose_continuation (scm_thread *thread, SCM cont)
scm_dynstack_wind_1 (&thread->dynstack, walk);
}
}
return mra;
}
static int
@ -1210,6 +1216,7 @@ foreign_call (scm_thread *thread, SCM cif, SCM pointer)
static SCM
capture_delimited_continuation (struct scm_vm *vp,
union scm_vm_stack_element *saved_fp,
uint8_t *saved_mra,
jmp_buf *saved_registers,
scm_t_dynstack *dynstack,
jmp_buf *current_registers)
@ -1243,8 +1250,8 @@ capture_delimited_continuation (struct scm_vm *vp,
/* Capture from the base_fp to the top thunk application frame. Don't
capture values from the most recent frame, as they are the abort
args. */
vm_cont = scm_i_vm_capture_stack (base_fp, vp->fp, vp->fp, vp->ip, dynstack,
flags);
vm_cont = capture_stack (base_fp, vp->fp, vp->fp, vp->ip,
saved_mra, dynstack, flags);
return scm_i_make_composable_continuation (vm_cont);
}
@ -1257,8 +1264,8 @@ scm_i_vm_abort (SCM *tag_and_argv, size_t n)
abort ();
}
static void
abort_to_prompt (scm_thread *thread)
static uint8_t *
abort_to_prompt (scm_thread *thread, uint8_t *saved_mra)
{
struct scm_vm *vp = &thread->vm;
scm_t_dynstack *dynstack = &thread->dynstack;
@ -1268,15 +1275,16 @@ abort_to_prompt (scm_thread *thread)
scm_t_dynstack_prompt_flags flags;
ptrdiff_t fp_offset, sp_offset;
union scm_vm_stack_element *fp, *sp;
uint32_t *ip;
uint32_t *vra;
uint8_t *mra;
jmp_buf *registers;
tag = SCM_FRAME_LOCAL (vp->fp, 1);
nargs = frame_locals_count (thread) - 2;
prompt = scm_dynstack_find_prompt (dynstack, tag,
&flags, &fp_offset, &sp_offset, &ip,
&registers);
&flags, &fp_offset, &sp_offset,
&vra, &mra, &registers);
if (!prompt)
scm_misc_error ("abort", "Abort to unknown prompt", scm_list_1 (tag));
@ -1292,8 +1300,8 @@ abort_to_prompt (scm_thread *thread)
scm_t_dynstack *captured;
captured = scm_dynstack_capture (dynstack, SCM_DYNSTACK_NEXT (prompt));
cont = capture_delimited_continuation (vp, fp, registers, captured,
thread->vm.registers);
cont = capture_delimited_continuation (vp, fp, saved_mra, registers,
captured, thread->vm.registers);
}
/* Unwind. */
@ -1313,15 +1321,20 @@ abort_to_prompt (scm_thread *thread)
/* Restore VM regs */
vp->fp = fp;
vp->sp = sp;
vp->ip = ip;
vp->ip = vra;
/* If there are intervening C frames, then jump over them, making a
nonlocal exit. Otherwise fall through and let the VM pick up where
it left off. */
if (thread->vm.registers != registers)
{
vp->mra_after_abort = mra;
longjmp (*registers, 1);
}
return mra;
}
static uint32_t *
get_callee_vcode (scm_thread *thread)
{
@ -1422,10 +1435,13 @@ scm_call_n (SCM proc, SCM *argv, size_t nargs)
resume = setjmp (registers);
if (SCM_UNLIKELY (resume))
{
uint8_t *mcode = vp->mra_after_abort;
scm_gc_after_nonlocal_exit ();
/* Non-local return. */
if (vp->trace_level)
invoke_abort_hook (thread);
if (mcode)
vp->ip = scm_jit_enter_mcode (thread, mcode);
}
else
vp->ip = get_callee_vcode (thread);

11
libguile/vm.h
View file

@ -58,6 +58,7 @@ struct scm_vm {
SCM overflow_handler_stack; /* alist of max-stack-size -> thunk */
SCM hooks[SCM_VM_NUM_HOOKS]; /* hooks */
jmp_buf *registers; /* registers captured at latest vm entry */
uint8_t *mra_after_abort; /* mra to resume after nonlocal exit, or NULL */
int engine; /* which vm engine we're using */
};
@ -90,7 +91,9 @@ SCM_INTERNAL void scm_i_vm_free_stack (struct scm_vm *vp);
struct scm_vm_cont {
/* IP of newest frame. */
uint32_t *ra;
uint32_t *vra;
/* Machine code corresponding to IP. */
uint8_t *mra;
/* Offset of FP of newest frame, relative to stack top. */
ptrdiff_t fp_offset;
/* Besides being the stack size, this is also the offset of the SP of
@ -114,12 +117,6 @@ SCM_API SCM scm_load_compiled_with_vm (SCM file);
SCM_INTERNAL SCM scm_i_call_with_current_continuation (SCM proc);
SCM_INTERNAL SCM scm_i_capture_current_stack (void);
SCM_INTERNAL SCM scm_i_vm_capture_stack (union scm_vm_stack_element *stack_top,
union scm_vm_stack_element *fp,
union scm_vm_stack_element *sp,
uint32_t *ra,
scm_t_dynstack *dynstack,
uint32_t flags);
SCM_INTERNAL void scm_i_vm_abort (SCM *tag_and_argv, size_t n) SCM_NORETURN;
SCM_INTERNAL int scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame);
SCM_INTERNAL void scm_i_vm_cont_print (SCM x, SCM port,