core: Add continuations, call/cc.
* mes.c (type_t): Add CONTINUATION.
(scm_t): Add continuation;
(scm_call_with_current_continuation): New symbol.
(scm_symbol_call_with_current_continuation): New special.
(g_continuations): New global
(CONTINUATION): New field accessor.
(MAKE_CONTINUATION): New make_cell helper.
(car_): Update.
(eval_apply): Implement call/cc.
* module/mes/display.mes (display): Handle continuations.
* module/mes/type-0.mes (<cell:continuation>): New type.
(cell-type-alist): Add it.
(continuation?): New function.
* tests/base.test ("call/cc"): New test.
This commit is contained in:
Jan Nieuwenhuizen
parent
b66cd8627c
commit
d0f7db73f9
47
mes.c
47
mes.c
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@ -46,7 +46,7 @@ int MAX_ARENA_SIZE = 20000000;
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int GC_SAFETY = 100;
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typedef int SCM;
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enum type_t {CHAR, CLOSURE, FUNCTION, KEYWORD, MACRO, NUMBER, PAIR, REF, SPECIAL, STRING, SYMBOL, VALUES, VECTOR, BROKEN_HEART};
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enum type_t {CHAR, CLOSURE, CONTINUATION, FUNCTION, KEYWORD, MACRO, NUMBER, PAIR, REF, SPECIAL, STRING, SYMBOL, VALUES, VECTOR, BROKEN_HEART};
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typedef SCM (*function0_t) (void);
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typedef SCM (*function1_t) (SCM);
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typedef SCM (*function2_t) (SCM, SCM);
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@ -77,6 +77,7 @@ typedef struct scm_struct {
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int function;
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SCM cdr;
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SCM closure;
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SCM continuation;
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SCM macro;
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SCM vector;
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int hits;
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@ -106,6 +107,8 @@ scm scm_symbol_macro_expand = {SYMBOL, "macro-expand"};
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scm scm_symbol_sc_expander_alist = {SYMBOL, "*sc-expander-alist*"};
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scm scm_symbol_call_with_values = {SYMBOL, "call-with-values"};
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scm scm_call_with_current_continuation = {SPECIAL, "*call/cc*"};
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scm scm_symbol_call_with_current_continuation = {SYMBOL, "call-with-current-continuation"};
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scm scm_symbol_current_module = {SYMBOL, "current-module"};
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scm scm_symbol_primitive_load = {SYMBOL, "primitive-load"};
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scm scm_symbol_read_input_file = {SYMBOL, "read-input-file"};
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@ -146,6 +149,7 @@ scm scm_vm_begin2 = {SPECIAL, "*vm-begin2*"};
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scm scm_vm_if = {SPECIAL, "*vm-if*"};
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scm scm_vm_if_expr = {SPECIAL, "*vm-if-expr*"};
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scm scm_vm_call_with_values2 = {SPECIAL, "*vm-call-with-values2*"};
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scm scm_vm_call_with_current_continuation2 = {SPECIAL, "*vm-call-with-current-continuation2*"};
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scm scm_vm_return = {SPECIAL, "*vm-return*"};
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scm scm_test = {SYMBOL, "test"};
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@ -163,6 +167,7 @@ SCM tmp_num2;
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function_t functions[200];
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int g_function = 0;
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SCM g_continuations = 0;
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SCM g_symbols = 0;
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SCM g_stack = 0;
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SCM r0 = 0; // a/env
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@ -178,6 +183,7 @@ SCM r3 = 0; // continuation
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#define CAR(x) g_cells[x].car
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#define CDR(x) g_cells[x].cdr
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#define CONTINUATION(x) g_cells[x].cdr
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#define HITS(x) g_cells[x].hits
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#define LENGTH(x) g_cells[x].length
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#define NAME(x) g_cells[x].name
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@ -202,6 +208,7 @@ SCM r3 = 0; // continuation
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#define CADR(x) CAR (CDR (x))
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#define MAKE_CHAR(n) make_cell (tmp_num_ (CHAR), 0, tmp_num2_ (n))
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#define MAKE_CONTINUATION(n) make_cell (tmp_num_ (CONTINUATION), n, g_stack)
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#define MAKE_NUMBER(n) make_cell (tmp_num_ (NUMBER), 0, tmp_num2_ (n))
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#define MAKE_REF(n) make_cell (tmp_num_ (REF), n, 0)
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#define MAKE_STRING(x) make_cell (tmp_num_ (STRING), x, 0)
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@ -293,11 +300,12 @@ type_ (SCM x)
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SCM
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car_ (SCM x)
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{
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return (TYPE (CAR (x)) == PAIR
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|| TYPE (CAR (x)) == REF
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|| TYPE (CAR (x)) == SPECIAL
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|| TYPE (CAR (x)) == SYMBOL
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|| TYPE (CAR (x)) == STRING) ? CAR (x) : MAKE_NUMBER (CAR (x));
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return (TYPE (x) != CONTINUATION
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&& (TYPE (CAR (x)) == PAIR // FIXME: this is weird
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|| TYPE (CAR (x)) == REF
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|| TYPE (CAR (x)) == SPECIAL
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|| TYPE (CAR (x)) == SYMBOL
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|| TYPE (CAR (x)) == STRING)) ? CAR (x) : MAKE_NUMBER (CAR (x));
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}
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SCM
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@ -412,6 +420,7 @@ eval_apply ()
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case cell_vm_begin2: goto begin2;
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case cell_vm_if: goto vm_if;
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case cell_vm_if_expr: goto if_expr;
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case cell_vm_call_with_current_continuation2: goto call_with_current_continuation2;
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case cell_vm_call_with_values2: goto call_with_values2;
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case cell_vm_return: goto vm_return;
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case cell_unspecified: return r1;
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@ -453,6 +462,14 @@ eval_apply ()
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call_lambda (body, p, aa, r0);
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goto begin;
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}
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case CONTINUATION:
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{
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x = r1;
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g_stack = CONTINUATION (CAR (r1));
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gc_pop_frame ();
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r1 = cadr (x);
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goto eval_apply;
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}
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case SPECIAL:
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{
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switch (car (r1))
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@ -467,6 +484,11 @@ eval_apply ()
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push_cc (CADR (r1), r1, CADDR (r1), cell_vm_return);
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goto eval;
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}
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case cell_call_with_current_continuation:
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{
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r1 = cdr (r1);
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goto call_with_current_continuation;
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}
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default: error ("cannot apply special: ", car (r1));
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}
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}
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@ -668,6 +690,16 @@ eval_apply ()
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r1 = cell_unspecified;
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goto vm_return;
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call_with_current_continuation:
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gc_push_frame ();
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x = MAKE_CONTINUATION (g_continuations++);
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gc_pop_frame ();
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push_cc (cons (car (r1), cons (x, cell_nil)), x, r0, cell_vm_call_with_current_continuation2);
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goto apply;
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call_with_current_continuation2:
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CONTINUATION (r2) = g_stack;
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goto vm_return;
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call_with_values:
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push_cc (cons (car (r1), cell_nil), r1, r0, cell_vm_call_with_values2);
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goto apply;
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@ -921,6 +953,7 @@ gc_loop (SCM scan)
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while (scan < g_free)
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{
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if (NTYPE (scan) == CLOSURE
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|| NTYPE (scan) == CONTINUATION
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|| NTYPE (scan) == FUNCTION
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|| NTYPE (scan) == KEYWORD
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|| NTYPE (scan) == MACRO
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@ -935,6 +968,7 @@ gc_loop (SCM scan)
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gc_relocate_car (scan, car);
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}
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if ((NTYPE (scan) == CLOSURE
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|| NTYPE (scan) == CONTINUATION
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|| NTYPE (scan) == MACRO
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|| NTYPE (scan) == PAIR
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|| NTYPE (scan) == VALUES)
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@ -1047,6 +1081,7 @@ mes_symbols () ///((internal))
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#endif
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a = acons (cell_symbol_dot, cell_dot, a);
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a = acons (cell_symbol_begin, cell_begin, a);
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a = acons (cell_symbol_call_with_current_continuation, cell_call_with_current_continuation, a);
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a = acons (cell_symbol_sc_expand, cell_f, a);
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a = acons (cell_closure, a, a);
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@ -159,6 +159,7 @@
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(mes-use-module (srfi srfi-0))
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(mes-use-module (mes base))
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(mes-use-module (mes quasiquote))
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(mes-use-module (mes let))
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(mes-use-module (mes scm))
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(mes-use-module (srfi srfi-13))
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(mes-use-module (mes display))
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@ -41,6 +41,7 @@
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(define (cadddr x) (car (cdr (cdr (cdr x)))))
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(define (identity x) x)
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(define call/cc call-with-current-continuation)
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(define (command-line) argv)
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@ -86,6 +86,10 @@
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(display " " port)
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(display (cadr (core:cdr x)) port)
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(display ">" port))
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((continuation? x)
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(display "#<continuation " port)
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(display (core:car x) port)
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(display ">" port))
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((macro? x)
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(display "#<macro " port)
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(display (core:cdr x) port)
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@ -43,8 +43,8 @@
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(set-cdr! (assq (quote *closure*) a) a+)
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(car a+)))
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(env:define (cons (cons (quote <cell:macro>) 4) (list)) (current-module))
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(env:define (cons (cons (quote <cell:pair>) 6) (list)) (current-module))
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(env:define (cons (cons (quote <cell:macro>) 5) (list)) (current-module))
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(env:define (cons (cons (quote <cell:pair>) 7) (list)) (current-module))
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(env:define (cons (cons (quote sexp:define) #f) (list)) (current-module))
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(env:define (cons (cons (quote env:macro) #f) (list)) (current-module))
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(env:define (cons (cons (quote cons*) #f) (list)) (current-module))
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@ -105,8 +105,8 @@
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(current-module))) (current-module))
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(define <cell:character> 0)
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(define <cell:keyword> 3)
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(define <cell:string> 9)
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(define <cell:keyword> 4)
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(define <cell:string> 10)
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(define (newline . rest) (core:stderr (list->string (list (integer->char 10)))))
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(define (display x . rest) (core:stderr x))
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@ -27,22 +27,24 @@
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(define <cell:char> 0)
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(define <cell:closure> 1)
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(define <cell:function> 2)
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(define <cell:keyword> 3)
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(define <cell:macro> 4)
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(define <cell:number> 5)
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(define <cell:pair> 6)
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(define <cell:ref> 7)
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(define <cell:special> 8)
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(define <cell:string> 9)
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(define <cell:symbol> 10)
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(define <cell:values> 11)
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(define <cell:vector> 12)
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(define <cell:broken-heart> 13)
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(define <cell:continuation> 2)
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(define <cell:function> 3)
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(define <cell:keyword> 4)
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(define <cell:macro> 5)
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(define <cell:number> 6)
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(define <cell:pair> 7)
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(define <cell:ref> 8)
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(define <cell:special> 9)
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(define <cell:string> 10)
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(define <cell:symbol> 11)
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(define <cell:values> 12)
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(define <cell:vector> 13)
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(define <cell:broken-heart> 14)
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(define cell:type-alist
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(list (cons <cell:char> (quote <cell:char>))
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(cons <cell:closure> (quote <cell:closure>))
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(cons <cell:continuation> (quote <cell:continuation>))
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(cons <cell:function> (quote <cell:function>))
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(cons <cell:keyword> (quote <cell:keyword>))
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(cons <cell:macro> (quote <cell:macro>))
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@ -65,6 +67,9 @@
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(define (closure? x)
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(eq? (core:type x) <cell:closure>))
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(define (continuation? x)
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(eq? (core:type x) <cell:continuation>))
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(define (function? x)
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(eq? (core:type x) <cell:function>))
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@ -89,4 +89,13 @@ exit $?
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(if (not guile?)
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(pass-if-equal "load" 42 (begin (load "tests/data/load.scm") the-answer)))
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(pass-if-equal "call/cc"
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0
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(let ((cont #f)
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(seen? #f))
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(+ 1 (call/cc (lambda (c) (set! cont c) 1)))
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(if seen? 0
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(begin (set! seen? #t)
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(cont 2)))))
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(result 'report)
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