Oops, that patch was slightly old -- I must have run `git diff' again
and only looked at the output rather than saving it to a file. Here's
a more recent patch.
diff --git a/src/microcode/cmpint.c b/src/microcode/cmpint.c
index 52e0c6e..5cb0868 100644
--- a/src/microcode/cmpint.c
+++ b/src/microcode/cmpint.c
@@ -71,7 +71,8 @@ typedef enum
REFLECT_CODE_INTERNAL_APPLY,
REFLECT_CODE_RESTORE_INTERRUPT_MASK,
REFLECT_CODE_STACK_MARKER,
- REFLECT_CODE_CC_BKPT
+ REFLECT_CODE_CC_BKPT,
+ REFLECT_CODE_RESTORE_CONTROL_POINT,
} reflect_code_t;
#define PUSH_REFLECTION(code) do \
@@ -1495,6 +1496,74 @@ apply_compiled_from_primitive (unsigned long n_args,
SCHEME_OBJECT procedure)
PUSH_REFLECTION (REFLECT_CODE_INTERNAL_APPLY);
}
}
+
+void
+setup_compiled_control_point (void)
+{
+ /* The number of objects we push here must match the definition of
+ COMPILED_CODE_POINT_OVERHEAD in cmpint.h. Pushing
+ RC_REENTER_COMPILED_CODE enables the interpreter to unpack the
+ control point without needing to check the stack for a compiled
+ return address; restore_compiled_control_point just skips it. */
+
+ STACK_PUSH (ULONG_TO_FIXNUM (GET_INT_MASK)); /* 1 */
+ PUSH_REFLECTION (REFLECT_CODE_RESTORE_INTERRUPT_MASK); /* 2 */
+ SAVE_LAST_RETURN_CODE (RC_REENTER_COMPILED_CODE); /* 2 */
+}
+
+static void
+restore_compiled_control_point (void)
+{
+ unpack_control_point (STACK_POP ());
+ RESTORE_CONT ();
+ assert (GET_RC == RC_REENTER_COMPILED_CODE);
+ RESTORE_LAST_RETURN_CODE ();
+}
+
+void
+setup_compiled_control_point_restoration (SCHEME_OBJECT control_point)
+{
+ /* The JOIN-STACKLETS return code serves no functional purpose; it
+ is pushed to appease the stack parsers (both the runtime's in
+ conpar.scm and the microcode's in debug.c) and the last return
+ code abstraction, which requires that some interpreter return
+ code be on the stack at all times. */
+
+ /* FIXME: Update the stack parsers, and figure out what to do about
+ the last return code. */
+
+ SET_RC (RC_JOIN_STACKLETS);
+ SET_EXP (control_point);
+ SAVE_CONT ();
+ last_return_code = (STACK_LOC (CONTINUATION_RETURN_CODE));
+ STACK_PUSH (control_point);
+ PUSH_REFLECTION (REFLECT_CODE_RESTORE_CONTROL_POINT);
+}
+
+SCHEME_OBJECT
+reuse_compiled_control_point (long return_address_offset)
+{
+ return
+ ((((STACK_REF (return_address_offset)) == reflect_to_interface)
+ && ((OBJECT_DATUM (STACK_REF (return_address_offset + 1)))
+ == REFLECT_CODE_RESTORE_CONTROL_POINT))
+ ? (STACK_REF (return_address_offset + 2))
+ : SHARP_F);
+}
+
+void
+compiled_catch (SCHEME_OBJECT procedure, SCHEME_OBJECT control_point)
+{
+ STACK_PUSH (control_point);
+ setup_compiled_invocation_from_primitive (procedure, 1);
+}
+
+void
+compiled_throw (SCHEME_OBJECT thunk, SCHEME_OBJECT control_point)
+{
+ setup_compiled_control_point_restoration (control_point);
+ setup_compiled_invocation_from_primitive (thunk, 0);
+}
void
compiled_with_interrupt_mask (unsigned long old_mask,
@@ -2108,6 +2177,10 @@ DEFINE_TRAMPOLINE (comutil_reflect_to_interface)
RETURN_TO_SCHEME (addr);
}
+ case REFLECT_CODE_RESTORE_CONTROL_POINT:
+ restore_compiled_control_point ();
+ INVOKE_RETURN_ADDRESS ();
+
default:
STACK_PUSH (code);
RETURN_TO_C (ERR_EXTERNAL_RETURN);
diff --git a/src/microcode/cmpint.h b/src/microcode/cmpint.h
index 2c92fc8..221bad4 100644
--- a/src/microcode/cmpint.h
+++ b/src/microcode/cmpint.h
@@ -388,10 +388,21 @@ extern long apply_compiled_procedure (void);
extern long return_to_compiled_code (void);
extern void apply_compiled_from_primitive (unsigned long, SCHEME_OBJECT);
+extern void compiled_catch (SCHEME_OBJECT, SCHEME_OBJECT);
+extern void compiled_throw (SCHEME_OBJECT, SCHEME_OBJECT);
extern void compiled_with_interrupt_mask
(unsigned long, SCHEME_OBJECT, unsigned long);
extern void compiled_with_stack_marker (SCHEME_OBJECT);
+/* This is the number of objects that setup_compiled_control_point
+ pushes onto the stack. */
+
+#define COMPILED_CONTROL_POINT_OVERHEAD 5
+
+extern SCHEME_OBJECT reuse_compiled_control_point (long);
+extern void setup_compiled_control_point (void);
+extern void setup_compiled_control_point_restoration (SCHEME_OBJECT);
+
extern void compiler_initialize (bool);
extern void compiler_reset (SCHEME_OBJECT);
diff --git a/src/microcode/hooks.c b/src/microcode/hooks.c
index 7354509..dfdc525 100644
--- a/src/microcode/hooks.c
+++ b/src/microcode/hooks.c
@@ -113,6 +113,79 @@ Invokes PROCEDURE on the arguments in ARG-LIST.")
}
}
+static SCHEME_OBJECT
+setup_catch (long frame_size,
+ long control_point_overhead,
+ SCHEME_OBJECT (*reuse_control_point) (long),
+ void (*setup_control_point) (void),
+ void (*setup_restoration) (SCHEME_OBJECT))
+{
+ SCHEME_OBJECT control_point = ((*reuse_control_point) (frame_size));
+ SCHEME_OBJECT *scan;
+
+ if (control_point != SHARP_F)
+ {
+ POP_PRIMITIVE_FRAME (frame_size);
+ return (control_point);
+ }
+
+ control_point
+ = (allocate_control_point
+ ((control_point_overhead + (STACK_N_PUSHED - frame_size)), true));
+
+ /* Edit the stack only after the allocation, which requires the
+ stack to be intact in case it triggers a garbage collection. */
+
+ POP_PRIMITIVE_FRAME (frame_size);
+ (*setup_control_point) ();
+ scan = (control_point_start (control_point));
+ while (STACK_N_PUSHED > 0)
+ (*scan++) = (STACK_POP ());
+
+#ifdef ENABLE_DEBUGGING_TOOLS
+ if (STACK_N_PUSHED != 0)
+ Microcode_Termination (TERM_BAD_STACK);
+#endif
+
+ CLEAR_INTERRUPT (INT_Stack_Overflow);
+ STACK_RESET ();
+ (*setup_restoration) (control_point);
+ return (control_point);
+}
+
+static SCHEME_OBJECT
+reuse_interpreted_control_point (long frame_size)
+{
+ if (((STACK_LOC (frame_size + CONTINUATION_SIZE)) == STACK_BOTTOM)
+ && (CHECK_RETURN_CODE (RC_JOIN_STACKLETS, frame_size))
+ && (CONTROL_POINT_P (CONT_EXP (frame_size))))
+ {
+ SCHEME_OBJECT control_point = (CONT_EXP (1));
+ history_register = (OBJECT_ADDRESS (READ_DUMMY_HISTORY ()));
+ return (control_point);
+ }
+
+ return (SHARP_F);
+}
+
+#define INTERPRETED_CONTROL_POINT_OVERHEAD (CONTINUATION_SIZE + HISTORY_SIZE)
+
+static void
+setup_interpreted_control_point (void)
+{
+ SAVE_HISTORY (RC_RESTORE_HISTORY);
+ preserve_interrupt_mask ();
+ prev_restore_history_offset = 0;
+}
+
+static void
+setup_interpreted_control_point_restoration (SCHEME_OBJECT control_point)
+{
+ SET_RC (RC_JOIN_STACKLETS);
+ SET_EXP (control_point);
+ SAVE_CONT ();
+}
+
/* CALL-WITH-CURRENT-CONTINUATION creates a control point (a pointer
to the current stack) and passes it to PROCEDURE as its only
argument. The inverse operation, typically called THROW, is
@@ -126,57 +199,42 @@ DEFINE_PRIMITIVE ("CALL-WITH-CURRENT-CONTINUATION",
Prim_catch, 1, 1,
Invoke PROCEDURE with a copy of the current control stack.")
{
PRIMITIVE_HEADER (1);
- canonicalize_primitive_context ();
{
+ long frame_size = 1;
SCHEME_OBJECT procedure = (ARG_REF (1));
- SCHEME_OBJECT cp;
+ SCHEME_OBJECT control_point;
- /* Optimization: if the current stack consists only of an
- RC_JOIN_STACKLETS frame, there's no need to create a new
- control point. */
-
- if (((STACK_LOC (1 + CONTINUATION_SIZE)) == STACK_BOTTOM)
- && (CHECK_RETURN_CODE (RC_JOIN_STACKLETS, 1))
- && (CONTROL_POINT_P (CONT_EXP (1))))
+#ifdef CC_SUPPORT_P
+ if ((CC_ENTRY_P (procedure)) && (CC_ENTRY_P (STACK_REF (1))))
{
- cp = (CONT_EXP (1));
- history_register = (OBJECT_ADDRESS (READ_DUMMY_HISTORY ()));
- POP_PRIMITIVE_FRAME (1);
- STACK_RESET ();
+ control_point
+ = (setup_catch
+ (frame_size,
+ COMPILED_CONTROL_POINT_OVERHEAD,
+ (&reuse_compiled_control_point),
+ (&setup_compiled_control_point),
+ (&setup_compiled_control_point_restoration)));
+ compiled_catch (procedure, control_point);
+ UN_POP_PRIMITIVE_FRAME (1);
+ PRIMITIVE_RETURN (UNSPECIFIC);
}
- else
- {
- cp = (allocate_control_point ((CONTINUATION_SIZE
- + HISTORY_SIZE
- + (STACK_N_PUSHED - 1)),
- true));
- POP_PRIMITIVE_FRAME (1);
-
- SAVE_HISTORY (RC_RESTORE_HISTORY);
- preserve_interrupt_mask ();
- prev_restore_history_offset = 0;
- {
- SCHEME_OBJECT * scan = (control_point_start (cp));
- while (STACK_N_PUSHED > 0)
- (*scan++) = (STACK_POP ());
- }
-#ifdef ENABLE_DEBUGGING_TOOLS
- if (STACK_N_PUSHED != 0)
- Microcode_Termination (TERM_BAD_STACK);
#endif
- CLEAR_INTERRUPT (INT_Stack_Overflow);
- STACK_RESET ();
- SET_RC (RC_JOIN_STACKLETS);
- SET_EXP (cp);
- SAVE_CONT ();
- }
+ canonicalize_primitive_context ();
- STACK_PUSH (cp);
+ control_point
+ = (setup_catch
+ (frame_size,
+ INTERPRETED_CONTROL_POINT_OVERHEAD,
+ (&reuse_interpreted_control_point),
+ (&setup_interpreted_control_point),
+ (&setup_interpreted_control_point_restoration)));
+ STACK_PUSH (control_point);
STACK_PUSH (procedure);
PUSH_APPLY_FRAME_HEADER (1);
+ PRIMITIVE_ABORT (PRIM_APPLY);
}
- PRIMITIVE_ABORT (PRIM_APPLY);
+
/*NOTREACHED*/
PRIMITIVE_RETURN (UNSPECIFIC);
}
@@ -192,6 +250,15 @@ Invoke PROCEDURE with a copy of the current control
stack.")
that restores control-point when THUNK returns, and sets up
an apply frame for THUNK. */
+static void
+setup_throw (void)
+{
+ stack_pointer = STACK_BOTTOM;
+ /* We've discarded the history with the stack contents. */
+ prev_restore_history_offset = 0;
+ CLEAR_INTERRUPT (INT_Stack_Overflow);
+}
+
DEFINE_PRIMITIVE ("WITHIN-CONTROL-POINT", Prim_within_control_point, 2, 2,
"(CONTROL-POINT THUNK)\n\
Invoke THUNK with CONTROL-POINT as its control stack.")
@@ -199,20 +266,30 @@ Invoke THUNK with CONTROL-POINT as its control stack.")
SCHEME_OBJECT control_point, thunk;
PRIMITIVE_HEADER (2);
- canonicalize_primitive_context();
CHECK_ARG (1, CONTROL_POINT_P);
control_point = (ARG_REF (1));
thunk = (ARG_REF (2));
- stack_pointer = STACK_BOTTOM;
- /* We've discarded the history with the stack contents. */
- prev_restore_history_offset = 0;
- CLEAR_INTERRUPT (INT_Stack_Overflow);
+#ifdef CC_SUPPORT_P
+ {
+ if ((CC_ENTRY_P (thunk))
+ && (RETURN_CODE_P (* (control_point_start (control_point))))
+ && (RC_REENTER_COMPILED_CODE
+ == (OBJECT_DATUM (* (control_point_start (control_point))))))
+ {
+ setup_throw ();
+ compiled_throw (thunk, control_point);
+ UN_POP_PRIMITIVE_FRAME (2);
+ PRIMITIVE_RETURN (UNSPECIFIC);
+ }
+ }
+#endif
+
+ canonicalize_primitive_context ();
+ setup_throw ();
Will_Push (CONTINUATION_SIZE);
- SET_EXP (control_point);
- SET_RC (RC_JOIN_STACKLETS);
- SAVE_CONT ();
+ setup_interpreted_control_point_restoration (control_point);
Pushed ();
Will_Push (STACK_ENV_EXTRA_SLOTS + 1);
diff --git a/src/runtime/conpar.scm b/src/runtime/conpar.scm
index e37438f..4d3812a 100644
--- a/src/runtime/conpar.scm
+++ b/src/runtime/conpar.scm
@@ -59,7 +59,7 @@ USA.
(define (stack-frame/reductions stack-frame)
(let ((history (stack-frame/history stack-frame)))
- (if (eq? history undefined-history)
+ (if (or (not history) (eq? history undefined-history))
'()
(history-reductions history))))
@@ -132,7 +132,7 @@ USA.
(let ((stack-frame (stack-frame/next stack-frame)))
(and stack-frame
(if (stack-frame/subproblem? stack-frame)
- (stack-frame/next-subproblem stack-frame)
+ stack-frame
(loop stack-frame))))))
(else
(let ((stack-frame (stack-frame/next stack-frame)))
@@ -182,16 +182,10 @@ USA.
(make-parser-state
dynamic-state
block-thread-events?
- (control-point/interrupt-mask control-point)
- (let ((history
- (history-transform (control-point/history control-point))))
- (if (and (stream-pair? element-stream)
- (eq? return-address/reenter-compiled-code
- (stream-car element-stream)))
- history
- (history-superproblem history)))
- (control-point/previous-history-offset control-point)
- (control-point/previous-history-control-point control-point)
+ #f
+ #f
+ #f
+ #f
element-stream
(control-point/n-elements control-point)
(control-point/next-control-point control-point)
@@ -293,7 +287,7 @@ USA.
(make-parser-state (parser-state/dynamic-state state)
(parser-state/block-thread-events? state)
(parser-state/interrupt-mask state)
- (if (or force-pop? history-subproblem?)
+ (if (and history (or force-pop? history-subproblem?))
(history-superproblem history)
history)
previous-history-offset
@@ -360,10 +354,7 @@ USA.
(define-integrable code/special-compiled/restore-interrupt-mask 1)
(define-integrable code/special-compiled/stack-marker 2)
(define-integrable code/special-compiled/compiled-code-bkpt 3)
-(define-integrable code/interrupt-restart 4)
-(define-integrable code/restore-regs 5)
-(define-integrable code/apply-compiled 6)
-(define-integrable code/continue-linking 7)
+(define-integrable code/special-compiled/restore-continuation 4)
(define (parser/special-compiled type elements state)
(let ((code (vector-ref elements 1)))
@@ -376,11 +367,12 @@ USA.
type elements state))
((fix:= code code/special-compiled/stack-marker)
(parser/stack-marker type elements state))
- ((or (fix:= code code/special-compiled/compiled-code-bkpt)
- (fix:= code code/interrupt-restart)
- (fix:= code code/restore-regs)
- (fix:= code code/apply-compiled)
- (fix:= code code/continue-linking))
+ ((fix:= code code/special-compiled/restore-continuation)
+ (parse-control-point (vector-ref elements 2)
+ (parser-state/dynamic-state state)
+ (parser-state/block-thread-events? state)
+ #f))
+ ((fix:= code code/special-compiled/compiled-code-bkpt)
(parse/standard-next type elements state #f #f))
(else
(error "Unknown special compiled frame code:" code)))))
@@ -472,19 +464,42 @@ USA.
(with-values (lambda () (unparse/stack-frame stack-frame))
(lambda (element-stream next-control-point)
(make-control-point
- (stack-frame/interrupt-mask stack-frame)
- (let ((history (stack-frame/history stack-frame)))
- (if (eq? history undefined-history)
- (fixed-objects-item 'DUMMY-HISTORY)
- (history-untransform history)))
- (stack-frame/previous-history-offset stack-frame)
- (stack-frame/previous-history-control-point stack-frame)
- (if (stack-frame/compiled-code? stack-frame)
- (cons-stream return-address/reenter-compiled-code
- (cons-stream #f element-stream))
- element-stream)
+ (maybe-cons-restore-interrupt-mask
+ stack-frame
+ (maybe-cons-restore-history
+ stack-frame
+ (maybe-cons-reenter-compiled-code stack-frame element-stream)))
next-control-point))))
+(define (maybe-cons-restore-interrupt-mask stack-frame element-stream)
+ (let ((interrupt-mask (stack-frame/interrupt-mask stack-frame)))
+ (if (exact-integer? interrupt-mask)
+ (cons-stream return-address/restore-interrupt-mask
+ (cons-stream interrupt-mask element-stream))
+ element-stream)))
+
+(define (maybe-cons-restore-history stack-frame element-stream)
+ (let ((history (stack-frame/history stack-frame)))
+ (if history
+ (cons-stream
+ return-address/restore-history
+ (cons-stream
+ (if (eq? history undefined-history)
+ (fixed-objects-item 'DUMMY-HISTORY)
+ (history-untransform history))
+ (cons-stream
+ (stack-frame/previous-history-offset stack-frame)
+ (cons-stream
+ (stack-frame/previous-history-control-point stack-frame)
+ element-stream))))
+ element-stream)))
+
+(define (maybe-cons-reenter-compiled-code stack-frame element-stream)
+ (if (stack-frame/compiled-code? stack-frame)
+ (cons-stream return-address/reenter-compiled-code
+ (cons-stream #f element-stream))
+ element-stream))
+
(define (unparse/stack-frame stack-frame)
(if (eq? (stack-frame/return-address stack-frame)
return-address/join-stacklets)
@@ -512,6 +527,8 @@ USA.
(define return-address/join-stacklets)
(define return-address/reenter-compiled-code)
+(define return-address/restore-interrupt-mask)
+(define return-address/restore-history)
;;;; Special Frame Lengths
@@ -564,27 +581,8 @@ USA.
(if (not fsize)
5
(fix:+ 5 fsize))))
- ((fix:= code code/interrupt-restart)
- (let ((homes-saved (object-datum (stream-ref stream 2)))
- (regs-saved (object-datum (stream-ref stream 3))))
- ;; The first reg saved is _always_ the continuation,
- ;; part of the next frame.
- (fix:- (fix:+
- ;; Return code, reflect code, homes saved, regs saved,
- ;; and entry point
- 5
- (fix:+ homes-saved regs-saved))
- 1)))
- ((fix:= code code/restore-regs)
- (fix:+ 3 (object-datum (stream-ref stream 2))))
- ((fix:= code code/apply-compiled)
- ;; Stream[2] is code entry point, [3] is frame size
- (fix:+ 3 (object-datum (stream-ref stream 3))))
- ((fix:= code code/continue-linking)
- ;; return code, reflect code, entry size, original count,
- ;; block, environment, offset, last header offset,sections,
- ;; return address
- (fix:- 10 1))
+ ((fix:= code code/special-compiled/restore-continuation)
+ 3)
(else
(lose)))))
@@ -682,6 +680,10 @@ USA.
(make-return-address (microcode-return 'JOIN-STACKLETS)))
(set! return-address/reenter-compiled-code
(make-return-address (microcode-return 'REENTER-COMPILED-CODE)))
+ (set! return-address/restore-interrupt-mask
+ (make-return-address (microcode-return 'RESTORE-INTERRUPT-MASK)))
+ (set! return-address/restore-history
+ (make-return-address (microcode-return 'RESTORE-HISTORY)))
(set! stack-frame-types (make-stack-frame-types))
(set! stack-frame-type/hardware-trap
(microcode-return/name->type 'HARDWARE-TRAP))
diff --git a/src/runtime/contin.scm b/src/runtime/contin.scm
index fdb4a60..09b4019 100644
--- a/src/runtime/contin.scm
+++ b/src/runtime/contin.scm
@@ -31,11 +31,10 @@ USA.
(define (call-with-current-continuation receiver)
((ucode-primitive call-with-current-continuation 1)
(lambda (control-point)
- (let ((k
- (make-continuation control-point
- (get-dynamic-state)
- (get-thread-event-block))))
- (%within-continuation k #f (lambda () (receiver k)))))))
+ (receiver
+ (make-continuation control-point
+ (get-dynamic-state)
+ (get-thread-event-block))))))
(define (within-continuation k thunk)
(guarantee-continuation k 'WITHIN-CONTINUATION)
diff --git a/src/runtime/cpoint.scm b/src/runtime/cpoint.scm
index 380c0eb..a5deacd 100644
--- a/src/runtime/cpoint.scm
+++ b/src/runtime/cpoint.scm
@@ -31,18 +31,6 @@ USA.
(define-integrable (control-point? object)
(object-type? (ucode-type control-point) object))
-(define-integrable (control-point/interrupt-mask control-point)
- (control-point-ref control-point 1))
-
-(define-integrable (control-point/history control-point)
- (control-point-ref control-point 3))
-
-(define-integrable (control-point/previous-history-offset control-point)
- (control-point-ref control-point 4))
-
-(define-integrable (control-point/previous-history-control-point control-point)
- (control-point-ref control-point 5))
-
(define-integrable (control-point-ref control-point index)
(system-vector-ref control-point (control-point-index index)))
@@ -50,7 +38,7 @@ USA.
(fix:+ 2 index))
(define-integrable first-element-index
- (control-point-index 6))
+ (control-point-index 0))
#|
@@ -99,12 +87,7 @@ USA.
(system-vector-ref control-point
(fix:- (system-vector-length control-point) 1))))
-(define (make-control-point interrupt-mask
- history
- previous-history-offset
- previous-history-control-point
- element-stream
- next-control-point)
+(define (make-control-point element-stream next-control-point)
(let ((result
(make-vector (+ first-element-index
(stream-length element-stream)
@@ -119,12 +102,6 @@ USA.
;; when "stacklets" were used.
(assign #f)
(assign (make-non-pointer-object 0))
- (assign (ucode-return-address restore-interrupt-mask))
- (assign interrupt-mask)
- (assign (ucode-return-address restore-history))
- (assign history)
- (assign previous-history-offset)
- (assign previous-history-control-point)
(stream-for-each (lambda (element)
(assign (unmap-reference-trap element)))
element-stream)
diff --git a/src/runtime/error.scm b/src/runtime/error.scm
index ef654f2..e492518 100644
--- a/src/runtime/error.scm
+++ b/src/runtime/error.scm
@@ -594,6 +594,7 @@ USA.
(default-handler condition)))))))
(define (standard-error-handler condition)
+ ((ucode-primitive debugging-printer) "Help!\n")
(let ((hook standard-error-hook))
(if hook
(fluid-let ((standard-error-hook #f))
diff --git a/src/runtime/runtime.pkg b/src/runtime/runtime.pkg
index 046cb36..63b2e03 100644
--- a/src/runtime/runtime.pkg
+++ b/src/runtime/runtime.pkg
@@ -1245,12 +1245,8 @@ USA.
(parent (runtime))
(export ()
control-point/element-stream
- control-point/history
- control-point/interrupt-mask
control-point/n-elements
control-point/next-control-point
- control-point/previous-history-control-point
- control-point/previous-history-offset
control-point?
make-control-point))
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