This avoids an indirection and will make the tracer's job easier.
* libguile/frames.h (struct scm_vm_frame): New data type.
(scm_is_vm_frame):
(scm_vm_frame):
(scm_vm_frame_kind):
(scm_vm_frame_fp):
(scm_vm_frame_sp):
(scm_vm_frame_ip):
(scm_frame_init_from_vm_frame): New helpers.
* libguile/frames.c:
* libguile/stacks.c:
* libguile/stacks.h:
* libguile/vm.c: Update all users of SCM_VM_FRAME_* macros to use new
helpers.
* libguile/vm.h (struct scm_vm_cont): Include the tag word, and put
flags there. Rename stack bottom to stack slice and make a flexible
array.
(scm_is_vm_cont):
(scm_to_vm_cont):
(scm_from_vm_cont):
(scm_vm_cont_is_partial):
(scm_vm_cont_is_rewindable): New build-time helpers.
* libguile/continuations.c (scm_i_make_continuation):
(scm_i_continuation_to_frame):
(copy_stack_and_call):
* libguile/continuations.h (scm_t_contregs):
* libguile/frames.c (frame_stack_top):
* libguile/stacks.c (scm_make_stack): Adapt to take struct scm_vm_cont*
instead of SCM for continuations.
* libguile/vm.c (capture_stack): Adapt to scm_vm_cont change. Use new
gc_resolve_conservative_ref API to pin conservative refs from the
captured stack.
(scm_i_vm_cont_to_frame):
(scm_i_capture_current_stack):
(reinstate_continuation_x):
(capture_continuation):
(compose_continuation):
(capture_delimited_continuation):
(abort_to_prompt): Adapt to type changes.
* configure.ac: Remove code to detect BDW, that is taken care of by the
whippet macros. Remove support for ia64, for the moment at least,
perhaps for good.
* libguile/Makefile.am (libguile_@GUILE_EFFECTIVE_VERSION@_la_LDFLAGS):
Remove BDW cflags.
(modinclude_HEADERS): Remove bdw-gc.h.
* libguile/bdw-gc.h: Remove.
* libguile/fluids.c:
* libguile/hashtab.c:
* libguile/numbers.c:
* libguile/smob.c:
* libguile/srfi-4.c:
* libguile/struct.c:
* libguile/vectors.c:
* libguile/vm.c: Remove bdw-gc.h includes.
* meta/guile-4.0-uninstalled.pc.in (Libs):
* meta/guile-4.0.pc.in (Libs): Remove direct dependency on BDW-GC, as it
is all encapsulated through Whippet, which is not publically exposed.
* libguile/gc.h:
* libguile/gc.c (scm_gc_after_nonlocal_exit): Give it a scm_thread
argument, and cause GC with whippet API.
(scm_init_gc): Set alloc failure handler using Whippet API instead of
BDW.
(scm_oom_fn): Add heap argumnet.
* libguile/eval.c (eval):
* libguile/exceptions.c (scm_c_with_exception_handler):
* libguile/vm.c (scm_call_n): Adapt.
* libguile/scm.h (scm_tc7_thread): Give threads their own tc7.
* libguile/threads.h (struct scm_thread): Add a tag, so that struct
thread can be a SCM directly. Add a struct gc_mutator* member.
(scm_thread_handle): New inline function.
(SCM_I_IS_THREAD, SCM_I_THREAD_DATA, SCM_VALIDATE_THREAD): Update to use
tc7 instead of SMOB tags.
* libguile/continuations.c (scm_i_with_continuation_barrier)
* libguile/finalizers.c (queue_finalizer_async)
* libguile/jit.c (compile_current_thread)
* libguile/threads.c (block_self, guilify_self_2)
(lock_mutex, unlock_mutex, timed_wait scm_current_thread)
(scm_all_threads)
* libguile/vm-engine.c (current-thread): Use scm_thread_handle instead
of thread->handle.
* libguile/evalext.c (scm_self_evaluating_p):
* libguile/goops.c (class_thread, scm_class_of, scm_sys_goops_early_init)
* libguile/print.c (iprin1)
* module/language/cps/compile-bytecode.scm (compile-function)
* module/oop/goops.scm (<thread>)
* module/system/base/types.scm (cell->object)
* module/system/base/types/internal.scm (heap-tags)
* module/system/vm/assembler.scm: (emit-thread?): Adapt to
scm_tc7_thread.
* libguile/gc-internal.h: Move init functions that take "struct
gc_stack_addr" here, so that internal Whippet uses don't cause Whippet
to be added to public headers.
* libguile/gc.c (scm_storage_prehistory): Take struct gc_stack_addr as
arg, and pass to gc_init. Return a mutator pointer.
* libguile/init.c (scm_i_init_guile): Pass mutator and stack base to GC
and thread init routines.
* libguile/threads.c (scm_trace_dynstack, scm_trace_thread)
(scm_trace_thread_mutator_roots): New infra for marking threads in terms
of Whippet API.
* libguile/threads.c (guilify_self_1): Since we don't use a separate GC
kind for threads any more, and thread marking is keyed off
gc_mutator_set_roots, we can avoid some of the gnarly synchronization.
(on_thread_exit): Arrange to gc_finish_for_thread.
(scm_i_init_thread_for_guile): Use gc_init_for_thread.
(init_main_thread, with_guile, scm_i_with_guile): Use Whippet API.
(scm_threads_prehistory): Take main-thread mutator and the stack base as
arguments.
* libguile/vm.c (scm_trace_vm): Rework in terms of Whippet API.
* libguile/whippet-embedder.h (gc_trace_mutator_roots): Arrange to trace
the current mutator's SCM thread object.
* libguile/trace.h: New file, to declare implementations of trace
routines.
* libguile/Makefile.am (noinst_HEADERS): Add trace.h.
* libguile/posix-w32.c (getpagesize_w32): new procedure
* libguile/posix-w32.h: declaration of getpagesize_w32
* libguile/loader.c [__MINGW32__](scm_bootstrap_loader): use new procedure
* libguile/vm.c [__MINGW32__](scm_i_vm_prepare_stack): use new procedure
Fixes https://debbugs.gnu.org/63279. The issue was that if the producer
thunk caused a backtrace, pretty-printing the call-with-values frame
would segfault because there was an unininitialized slot on the stack.
For functions produced by the compiler this wouldn't be a problem
because there are stack maps, but primitives require that all slots on a
pending stack frame be packed (no uninitialized values) and tagged (all
SCM values, no unboxed values).
* test-suite/tests/error-handling.test: New test.
* test-suite/Makefile.am: Add new file.
* libguile/vm.c (define_vm_builtins): Fix call-with-values to have a
more compact stack.
Fixes <https://bugs.gnu.org/59021>.
Previously, the stack allocated in 'capture_stack' and stored in
'p->stack_bottom' could be retained, leading to heap growth.
* libguile/vm.c (capture_stack): Make a single 'scm_gc_malloc' call
instead of two.
* libguile/vm.c (push_interrupt_frame, compose_continuation): In places
where we push on synthetic frames before possibly going back to mcode,
make sure that the return mcode will trampoline back to the
interpreter. Fixes compose-continuation from the interpreter to
partial continuations with mcode.
* libguile/vm.c (scm_i_vm_emergency_abort, abort_to_prompt): Unwinding
the dynwind stack can run dynwind leave thunks, which may expand the
stack, which may invalidate previously calculated SP / FP values.
(Re)calculate SP/FP after unwinding, to avoid writing to unmapped
memory. Fixes compile errors seen on Ubuntu and some other ports.
* libguile/jit.c (emit_alloc_frame_for_sp):
* libguile/vm-engine.c (ALLOC_FRAME, RESET_FRAME):
* libguile/vm.c (vm_increase_sp, scm_i_vm_prepare_stack):
(return_unused_stack_to_os, vm_expand_stack, alloc_frame):
(scm_call_with_stack_overflow_handler):
* libguile/vm.h (struct scm_vm): Remove sp_min_since_gc handling. It
was a very minor optimization when it was centralized in vm.c, but now
with JIT it's causing too much duplicate code generation.
This patch is a bit unfortunate, in the sense that it exposes some of
the JIT guts to the rest of the VM. Code needs to treat "machine return
addresses" as valid if non-NULL (as before) and also not equal to a
tier-down trampoline. This is because tier-down at a return needs the
old frame pointer to load the "virtual return address", and the way this
patch works is that it passes the vra in a well-known register. It's a
custom calling convention for a certain kind of return.
* libguile/jit.h (scm_jit_return_to_interpreter_trampoline): New
internal global.
* libguile/jit.c: (scm_jit_clear_mcode_return_addresses): Move here,
from vm.c. Instead of zeroing return addresses, set them to the
return-to-interpreter trampoline.
* libguile/vm-engine.c (return-values): Don't enter mcode if the mra is
scm_jit_return_to_interpreter_trampoline.
* libguile/vm.c (capture_continuation): Treat the tier-down trampoline
as NULL.
* libguile/programs.c (scm_i_program_name): Use scm_i_primitive_name for
primitives. No functional change though.
* libguile/vm.c (DEFINE_BUILTIN): Mark builtins as primitives.
* libguile/jit.c: Wrap the whole thing in ENABLE_JIT.
* libguile/threads.c (on_thread_exit):
* libguile/vm.c (scm_call_n):
* libguile/init.c (scm_i_init_guile):
* libguile/vm-engine.c (VM_NAME): Wrap calls into jit.c with ENABLE_JIT.
* configure.ac: Move up AC_CANONICAL_TARGET, as autoconf was complaining
about it coming after AC_ARG_PROGRAM.
* acinclude.m4 (GUILE_ENABLE_JIT): Fix to honor --enable-jit arg.
* libguile/vm.c (scm_i_vm_emergency_abort): New helper: an abort that
doesn't allocate, not even stack.
* libguile/throw.c (abort_to_prompt): Use scm_i_vm_emergency_abort.
* libguile/vm.h: Declare helper.
* libguile/vm.c (vm_clear_mcode_return_addresses): New helper.
(vm_recompute_disable_mcode): Force a thread to deoptimize if hooks
become enabled.
(scm_call_n): Don't enter mcode if it's disabled. Also check the right
flag for when to run the abort hook (the abort_hook_enabled flag).
* libguile/vm-engine.c (instrument-entry, instrument-loop)
(return-values, abort, compose-continuation): Don't enter mcode if mcode
is disabled for this thread.
* libguile/vm.h (SCM_VM_NUM_HOOKS): Remove hook enumeration.
(struct scm_vm): Re-arrange members to be more dense and to use common
cache lines for commonly-used members. Declare hooks and their enabled
flags by name.
* libguile/vm-engine.c (RUN_HOOK): Refer to hooks by name.
* libguile/vm.c (FOR_EACH_HOOK): New helper.
(vm_hook_compute_enabled, vm_recompute_disable_mcode): New routines to
recompute when hooks are enabled, and whether to disable mcode because
hooks are active.
(set_vm_trace_level): New helper.
(invoke_hook): Take hook to invoke by value.
(DEFINE_INVOKE_HOOK): Refactor to use named hooks.
(scm_i_vm_prepare_stack): Init named hooks.
(VM_ADD_HOOK, VM_REMOVE_HOOK): Refactor to use named hooks, and also
recompute global disable_mcode flag.
(scm_set_vm_trace_level_x, scm_c_set_vm_engine_x): Use internal helper.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Remove VM hook
intrinsics, now that we're going to rely on the interpreter for
stepping and breakpoints.
* libguile/jit.c (struct scm_jit_state): Remove "hooks_enabled" member,
now that we won't JIT. Remove all code related to calling hooks.
* libguile/vm-engine.c (RUN_HOOK): Call hooks directly instead of
through intrinsics. Use precise per-hook enable flags.
* libguile/vm.c (DEFINE_INVOKE_HOOK): New helper. Use to define the
hook invokers.
* libguile/vm.h (SCM_VM_ABORT_HOOK): Rename from
SCM_VM_ABORT_CONTINUATION_HOOK.
* libguile/vm-engine.c (ABORT_HOOK):
* libguile/vm.c (invoke_abort_hook): Adapt to SCM_VM_ABORT_HOOK name
change.
(reset_vm_hook_enabled): New helper.
(VM_ADD_HOOK, VM_REMOVE_HOOK): New helper macros, replacing
VM_DEFINE_HOOK.
(scm_vm_add_abort_hook_x, scm_vm_remove_abort_hook_x)
(scm_vm_add_apply_hook_x, scm_vm_remove_apply_hook_x)
(scm_vm_add_return_hook_x, scm_vm_remove_return_hook_x)
(scm_vm_add_next_hook_x, scm_vm_remove_next_hook_x): New functions,
replacing direct access to the hooks. Allows us to know in a more
fine-grained way when to enable hooks.
(scm_set_vm_trace_level_x): Use reset_vm_hook_enabled to update the
individual hook_enabled flags.
* module/statprof.scm:
* module/system/vm/coverage.scm:
* module/system/vm/traps.scm:
* module/system/vm/vm.scm: Adapt VM hook users to the new API.
* libguile/intrinsics.h: Add "intrinsic" for handle-interrupts code.
Unlike the other intrinsics, this one isn't a function.
* libguile/programs.c (try_parse_arity): Add cases for instructions used
in VM builtins.
(scm_primitive_call_ip): Return #f if call-ip not found.
* libguile/vm-engine.c (handle-interrupts): Get code from intrinsics.
* libguile/vm.c
* libguile/vm.c (instrumented_code, define_vm_builtins): Add
instrumentation to the builtins, so that they can be JIT-compiled.
(INIT_BUILTIN): Remove min-arity setting; the fallback min-arity
interpreter should figure it out.
(scm_bootstrap_vm): Call the new define_vm_builtins function.
* libguile/gsubr.c (primitive_call_ip): Return 0 if call IP not found.
(primitive_subr_idx): Interpret call ip == 0 as not-a-subr.
* module/system/vm/program.scm (program-arguments-alist): Allow a #f
call-ip.
* libguile/intrinsics.h:
* libguile/intrinsics.c (string_set_x): Change to take size_t and u32 as
args.
(allocate_words): Change to take size_t as arg.
* libguile/vm.c (expand_apply_argument): Rename from rest_arg_length,
and also handle the stack manipulation.
* libguile/vm-engine.c (expand-apply-argument): Update for intrinsic
change.
(call-scm-sz-u32): Rename from call-scm-u64-u64, as it matches its
uses and will compile better on 32-bit systems.
* module/system/vm/assembler.scm (define-scm-sz-u32-intrinsic):
(string-set!): Update for new instrinsic call inst.
* libguile/jit.c (compile_call_scm_sz_u32): Adapt.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Update prototype of
capture-continuation.
* libguile/jit.h:
* libguile/jit.c (scm_jit_enter_mcode): Return void, not the vra.
Instead, we expect the code to set vp->ip for the vra.
* libguile/vm-engine.c (instrument-entry, instrument-loop)
(return-values, abort): Adapt scm_jit_enter_mcode calling convention.
(capture-continuation): No need to pass an mra; the intrinsic will
read it from the stack.
* libguile/vm.c (capture_continuation): Remove mra arg, as we take mra
from the continuation.
(scm_call_n): Adapt to scm_jit_enter_mcode change.
* 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.
* libguile/foreign.c (scm_i_foreign_call): Rename back from
foreign_call. Need a new trampoline that's easier to call from JIT,
until we actually rewrite the FFI in terms of the JIT.
(scm_register_foreign): Remove foreign_call intrinsic init.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Foreign-call
intrinsic sets return directly on stack.
* libguile/vm-engine.c (foreign-call): Adapt to new intrinsic behavior.
* libguile/vm.c (foreign_call, scm_bootstrap_vm): Add new intrinsic
wrapper.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Make intrinsics for
the VM hooks.
* libguile/vm-engine.c (RUN_HOOK): Run hooks through the intrinsics
table.
* libguile/vm.c (invoke_apply_hook, invoke_return_hook):
(invoke_next_hook, invoke_abort_hook): Rename, remove NOINLINE
attribute (as we call them through the intrinsics table).
(scm_bootstrap_vm): Init new intrinsics.
* libguile/intrinsics.h (SCM_FOR_ALL_VM_INTRINSICS): Add
unpack-values-object.
* libguile/vm-engine.c (subr-call): If the object is a values object,
call out to unpack-values-object. This is to avoid reifying
allocate-frame code in each jitted subr.
* libguile/vm.c (unpack_values_object, scm_bootstrap_vm): Define new
intrinsic.
* libguile/jit.c (compile_capture_continuation): Rename from call_cc now
that the call is elsewhere.
* libguile/vm-engine.c (call, tail-call): Remove needless SYNC_IP before
get-callee-vcode; the intrinsic can sync the ip if needed from the
frame.
(capture-continuation): Rename from call/cc, and leave the call itself
to tail-call.
* libguile/vm.c (vm_builtin_call_with_current_continuation_code): Update
to put the continuation in a local and then tail call.
(get_callee_vcode): Sync vp->ip if we error.
* libguile/intrinsics.h:
* libguile/vm.c (get_callee_vcode): Rename from apply_non_program, and
instead return the IP for the callee of a frame.
(scm_call_n, scm_bootstrap_vm): Adapt to get_callee_vcode change.
* libguile/vm-engine.c (call, tail-call, call/cc): Use
get_callee_vcode unconditionally. JIT will do this to avoid so much
code generation for calls.
Fixes <https://bugs.gnu.org/28211>.
* libguile/vm-engine.c (call, call_label, handle_interrupts): Add
'new_fp' variable; set the dynamic link and return address of the frame
at NEW_FP before setting 'vp->fp'. This fixes a bug whereby, in a
multi-threaded context, the stack-marking code could run after vp->fp
has been set but before its dynamic link has been set, leading the
stack-walking code in 'scm_i_vm_mark_stack' to exit early on.
* libguile/vm-engine.c (RUN_HOOK0, RUN_HOOK1): Remove.
(RUN_HOOK): Take hook name.
(APPLY_HOOK, RETURN_HOOK, NEXT_HOOK, ABORT_CONTINUATION_HOOK): Use
RUN_HOOK.
* libguile/vm.c (vm_dispatch_hook): Remove value count arg; hooks no
longer receive values (e.g. the return hook now uses
frame-return-values).
(vm_dispatch_abort_hook): Remove value count, which was bogus because
the active frame was the continuation which might contain other
locals, potentially unboxed, not the implicit return-values frame. In
the future we could push on an implicit return-values frame instead.
* module/system/vm/traps.scm (trap-in-procedure, trap-frame-finish):
(trap-in-dynamic-extent, trap-calls-to-procedure): Adapt abort hooks
to not take values. They weren't being used anyway!
* libguile/frames.c (scm_frame_return_values): New function, for use
when a frame is at "return-values".
(scm_init_frames_builtins): Register frame-return-values.
* libguile/vm-engine.c (RETURN_HOOK): Rename from POP_CONTINUATION_HOOK.
(call, call-label): Remove PUSH_CONTINUATION_HOOK; it's unneeded, as
you can always check the FP from an apply hook.
(return-values): Run return hook before popping frame.
* libguile/vm.c (vm_dispatch_return_hook): Rename from
vm_dispatch_pop_continuation_hook. Remove push continuation hook.
(scm_vm_return_hook):
* libguile/vm.h (SCM_VM_PUSH_CONTINUATION_HOOK): Remove.
(SCM_VM_RETURN_HOOK): Rename from SCM_VM_POP_CONTINUATION_HOOK.
* module/system/vm/frame.scm (frame-return-values): Export.
* module/system/vm/trace.scm (print-return, trace-calls-to-procedure)
(trace-calls-in-procedure): Adapt to not receiving values as
arguments.
* module/system/vm/traps.scm (trap-in-procedure, trap-frame-finish):
Adapt to return hook coming from returning frame.
(program-sources-by-line): Update to use match instead of pmatch.
* module/system/vm/traps.scm (trap-in-dynamic-extent)
(trap-calls-to-procedure): Adapt to return hook not receiving values.
* module/system/vm/vm.scm: Remove push continuation hook and rename
return hook.
* libguile/jit.h (struct scm_jit_function_data)
(enum scm_jit_counter_value): New data types.
* libguile/jit.c (scm_jit_compute_mcode, scm_jit_enter_mcode): New
function stubs. Adapt label/offset compilers to take pointers.
* libguile/vm-engine.c (instrument-call, instrument-loop): New
instructions.
* libguile/vm.c: Add jit.h include.
* module/system/vm/assembler.scm (emit-instrument-call)
(emit-instrument-loop): New exports.
This should reduce frame sizes.
* libguile/vm-engine.c (halt): Adapt to multiple-values change. Also
adapt to not having the boot closure on the stack.
(receive, receive-values, subr-call, foreign-call): Adapt to expect
values one slot down.
(prompt): Capture one less word for the values return.
* libguile/vm.c (vm_dispatch_pop_continuation_hook):
(vm_dispatch_abort_hook): Adapt for where to expect values.
(vm_builtin_values_code): Add a call to shuffle-down before
returning. This is more overhead than what existed before, but the
hope is that the savings elsewhere pay off.
(vm_builtin_values_code): Adapt to different values location.
(reinstate_continuation_x, compose_continuation): Adapt to place
resume args at right position.
(capture_delimited_continuation): Remove unused sp and ip arguments.
(abort_to_prompt): Adapt to capture_delimited_continuation change.
(scm_call_n): Adapt to not reserve space for the boot closure.
* module/language/cps/compile-bytecode.scm (compile-function): When
returning values, adapt reset-frame call for return calling convention
change. Adapt truncating or rest returns to expect values in the
right place.
* module/language/cps/slot-allocation.scm (compute-shuffles):
(allocate-lazy-vars, allocate-slots): Allocate values from the "proc
slot", not proc-slot + 1.
* module/system/vm/assembler.scm (emit-init-constants): Reset the frame
before returning so that the return value is in the right place.
* test-suite/tests/rtl.test: Update for return convention change.
* libguile/foreign.c (get_foreign_stub_code): Update for return calling
convention change.
* libguile/frames.h: Add machine return address to diagram.
(SCM_FRAME_MACHINE_RETURN_ADDRESS):
(SCM_FRAME_SET_MACHINE_RETURN_ADDRESS): New macros.
(SCM_FRAME_PREVIOUS_SP):
(SCM_FRAME_DYNAMIC_LINK):
(SCM_FRAME_SET_DYNAMIC_LINK): Adapt for new frame size.
* libguile/vm-engine.c (halt): Set frame size to 3.
(call, call-label): Set mRA to 0.
* libguile/vm.c (push_interrupt_frame, reinstate_continuation_x):
(scm_call_n): Set frame size to 3. In push_interrupt_frame, init the
mRA of the frame.
(vm_builtin_call_with_values_code, vm_handle_interrupt_code): Allocate
larger frames.
* module/language/cps/slot-allocation.scm (allocate-slots): Frame size
is 3.
* module/system/vm/disassembler.scm (define-clobber-parser): Bump frame
size.
