forked from racket/racket
/
print.c
4091 lines (3588 loc) · 116 KB
/
print.c
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/*
Racket
Copyright (c) 2004-2012 PLT Scheme Inc.
Copyright (c) 1995-2001 Matthew Flatt
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA.
libscheme
Copyright (c) 1994 Brent Benson
All rights reserved.
*/
#include "schpriv.h"
#include "schvers.h"
#include "schmach.h"
#include "schcpt.h"
#include <ctype.h>
#ifdef USE_STACKAVAIL
# include <malloc.h>
#endif
HOOK_SHARED_OK int (*scheme_check_print_is_obj)(Scheme_Object *o);
#define QUICK_ENCODE_BUFFER_SIZE 256
THREAD_LOCAL_DECL(static char *quick_buffer = NULL);
THREAD_LOCAL_DECL(static char *quick_encode_buffer = NULL);
/* FIXME places possible race condition on growing printer size */
SHARED_OK static Scheme_Type_Printer *printers;
SHARED_OK static int printers_count;
THREAD_LOCAL_DECL(static Scheme_Hash_Table *cache_ht);
/* read-only globals */
SHARED_OK static char compacts[_CPT_COUNT_];
SHARED_OK static Scheme_Hash_Table *global_constants_ht;
ROSYM Scheme_Object *quote_symbol;
ROSYM Scheme_Object *quasiquote_symbol;
ROSYM Scheme_Object *unquote_symbol;
ROSYM Scheme_Object *unquote_splicing_symbol;
ROSYM Scheme_Object *syntax_symbol;
ROSYM Scheme_Object *quasisyntax_symbol;
ROSYM Scheme_Object *unsyntax_symbol;
ROSYM Scheme_Object *unsyntax_splicing_symbol;
ROSYM Scheme_Object *qq_ellipses;
#define PRINT_MAXLEN_MIN 3
#define REASONABLE_QQ_DEPTH (1 << 29)
/* locals */
#define MAX_PRINT_BUFFER 500
typedef struct Scheme_Print_Params {
MZTAG_IF_REQUIRED
char print_struct;
char print_graph;
char print_box;
char print_vec_shorthand;
char print_hash_table;
char print_unreadable;
char print_pair_curly, print_mpair_curly;
char print_reader;
char print_long_bools;
char can_read_pipe_quote;
char case_sens;
Scheme_Object *inspector;
char printing_quoted;
/* Used during `display' and `write': */
char *print_buffer;
intptr_t print_position;
intptr_t print_allocated;
intptr_t print_maxlen;
intptr_t print_offset;
intptr_t print_syntax;
Scheme_Object *print_port;
mz_jmp_buf *print_escape;
Scheme_Object *depth_delta; /* for large qq depth */
Scheme_Hash_Table *uq_ht;
} PrintParams;
#ifdef MZ_PRECISE_GC
static void register_traversers(void);
#endif
static void print_to_port(char *name, Scheme_Object *obj, Scheme_Object *port,
int notdisplay, intptr_t maxl, Scheme_Object *qq_depth);
static int print(Scheme_Object *obj, int notdisplay, int compact,
Scheme_Hash_Table *ht,
Scheme_Marshal_Tables *mt,
PrintParams *p);
static void print_char_string(const char *s, int l, const mzchar *us, int delta, int ul,
int notdisplay, PrintParams *pp);
static void print_byte_string(const char *s, int delta, int l, int notdisplay, PrintParams *pp);
static void print_pair(Scheme_Object *pair, int notdisplay, int compact,
Scheme_Hash_Table *ht,
Scheme_Marshal_Tables *mt,
PrintParams *pp,
Scheme_Type type, int round_parens, int first_unquoted);
static void print_vector(Scheme_Object *vec, int notdisplay, int compact,
Scheme_Hash_Table *ht,
Scheme_Marshal_Tables *mt,
PrintParams *pp,
int as_prefab);
static void print_char(Scheme_Object *chobj, int notdisplay, PrintParams *pp);
static char *print_to_string(Scheme_Object *obj, intptr_t * volatile len, int write,
Scheme_Object *port, intptr_t maxl,
Scheme_Object *qq_depth);
static void custom_write_struct(Scheme_Object *s, Scheme_Hash_Table *ht,
Scheme_Marshal_Tables *mt,
PrintParams *pp, int notdisplay);
static Scheme_Object *writable_struct_subs(Scheme_Object *s, int for_write, PrintParams *pp);
#define print_compact(pp, v) print_this_string(pp, &compacts[v], 0, 1)
#define PRINTABLE_STRUCT(obj, pp) (scheme_inspector_sees_part(obj, pp->inspector, -1))
#define SCHEME_PREFABP(obj) (((Scheme_Structure *)(obj))->stype->prefab_key)
#define SCHEME_HASHTPx(obj) ((SCHEME_HASHTP(obj) && !(MZ_OPT_HASH_KEY(&(((Scheme_Hash_Table *)obj)->iso)) & 0x1)))
#define SCHEME_CHAPERONE_HASHTPx(obj) (SCHEME_HASHTPx(obj) \
|| (SCHEME_NP_CHAPERONEP(obj) && SCHEME_HASHTP(SCHEME_CHAPERONE_VAL(obj))))
#define HAS_SUBSTRUCT(obj, qk) \
(SCHEME_PAIRP(obj) \
|| SCHEME_MUTABLE_PAIRP(obj) \
|| SCHEME_CHAPERONE_VECTORP(obj) \
|| (qk(pp->print_box, 1) && SCHEME_CHAPERONE_BOXP(obj)) \
|| (qk(pp->print_struct \
&& SCHEME_CHAPERONE_STRUCTP(obj) \
&& PRINTABLE_STRUCT(obj, pp), 0)) \
|| (qk(SCHEME_CHAPERONE_STRUCTP(obj) && scheme_is_writable_struct(obj), 0)) \
|| (qk(pp->print_struct, 1) && SCHEME_CHAPERONE_STRUCTP(obj) && SCHEME_PREFABP(obj)) \
|| (qk(pp->print_hash_table, 1) && (SCHEME_CHAPERONE_HASHTPx(obj) || SCHEME_CHAPERONE_HASHTRP(obj))))
#define ssQUICK(x, isbox) x
#define ssQUICKp(x, isbox) (pp ? x : isbox)
#define ssALLp(x, isbox) isbox
void scheme_init_print(Scheme_Env *env)
{
int i;
for (i = 0; i < _CPT_COUNT_; i++) {
compacts[i] = i;
}
REGISTER_SO(quote_symbol);
REGISTER_SO(quasiquote_symbol);
REGISTER_SO(unquote_symbol);
REGISTER_SO(unquote_splicing_symbol);
REGISTER_SO(syntax_symbol);
REGISTER_SO(quasisyntax_symbol);
REGISTER_SO(unsyntax_symbol);
REGISTER_SO(unsyntax_splicing_symbol);
REGISTER_SO(qq_ellipses);
quote_symbol = scheme_intern_symbol("quote");
quasiquote_symbol = scheme_intern_symbol("quasiquote");
unquote_symbol = scheme_intern_symbol("unquote");
unquote_splicing_symbol = scheme_intern_symbol("unquote-splicing");
syntax_symbol = scheme_intern_symbol("syntax");
quasisyntax_symbol = scheme_intern_symbol("quasisyntax");
unsyntax_symbol = scheme_intern_symbol("unsyntax");
unsyntax_splicing_symbol = scheme_intern_symbol("unsyntax-splicing");
qq_ellipses = scheme_make_symbol("..."); /* uninterned */
#ifdef MZ_PRECISE_GC
register_traversers();
#endif
}
void scheme_init_print_global_constants()
{
REGISTER_SO(global_constants_ht);
global_constants_ht = scheme_map_constants_to_globals();
}
void scheme_init_print_buffers_places()
{
REGISTER_SO(quick_buffer);
REGISTER_SO(quick_encode_buffer);
REGISTER_SO(cache_ht);
quick_buffer = (char *)scheme_malloc_atomic(100);
quick_encode_buffer = (char *)scheme_malloc_atomic(QUICK_ENCODE_BUFFER_SIZE);
}
Scheme_Object *scheme_make_svector(mzshort c, mzshort *a)
{
Scheme_Object *o;
o = scheme_alloc_object();
o->type = scheme_svector_type;
SCHEME_SVEC_LEN(o) = c;
SCHEME_SVEC_VEC(o) = a;
return o;
}
PrintParams *copy_print_params(PrintParams *pp)
{
PrintParams *pp2;
pp2 = MALLOC_ONE_RT(PrintParams);
memcpy(pp2, pp, sizeof(PrintParams));
#ifdef MZTAG_REQUIRED
pp2->type = scheme_rt_print_params;
#endif
return pp2;
}
void
scheme_debug_print (Scheme_Object *obj)
{
scheme_write(obj, scheme_orig_stdout_port);
fflush (stdout);
}
static void *print_to_port_k(void)
{
Scheme_Thread *p = scheme_current_thread;
Scheme_Object *obj, *port, *depth;
port = (Scheme_Object *)p->ku.k.p1;
obj = (Scheme_Object *)p->ku.k.p2;
depth = (Scheme_Object *)p->ku.k.p3;
p->ku.k.p1 = NULL;
p->ku.k.p2 = NULL;
p->ku.k.p3 = NULL;
print_to_port((p->ku.k.i2
? ((p->ku.k.i2 == 2)
? "print"
: "write")
: "display"),
obj, port,
p->ku.k.i2, p->ku.k.i1,
depth);
return NULL;
}
static void do_handled_print(Scheme_Object *obj, Scheme_Object *port,
Scheme_Object *proc, intptr_t maxl)
{
Scheme_Object *a[2];
a[0] = obj;
if (maxl > 0) {
a[1] = scheme_make_byte_string_output_port();
} else
a[1] = port;
scheme_apply_multi(proc, 2, a);
if (maxl > 0) {
char *s;
intptr_t len;
s = scheme_get_sized_byte_string_output(a[1], &len);
if (len > maxl)
len = maxl;
scheme_write_byte_string(s, len, port);
}
}
void scheme_write_w_max(Scheme_Object *obj, Scheme_Object *port, intptr_t maxl)
{
if (((Scheme_Output_Port *)port)->write_handler)
do_handled_print(obj, port, scheme_write_proc, maxl);
else {
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = port;
p->ku.k.p2 = obj;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 1;
p->ku.k.p3 = NULL;
(void)scheme_top_level_do(print_to_port_k, 0);
}
}
void scheme_write(Scheme_Object *obj, Scheme_Object *port)
{
scheme_write_w_max(obj, port, -1);
}
void scheme_display_w_max(Scheme_Object *obj, Scheme_Object *port, intptr_t maxl)
{
if (((Scheme_Output_Port *)port)->display_handler)
do_handled_print(obj, port, scheme_display_proc, maxl);
else {
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = port;
p->ku.k.p2 = obj;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 0;
p->ku.k.p3 = NULL;
(void)scheme_top_level_do(print_to_port_k, 0);
}
}
void scheme_display(Scheme_Object *obj, Scheme_Object *port)
{
scheme_display_w_max(obj, port, -1);
}
void scheme_print_w_max(Scheme_Object *obj, Scheme_Object *port, intptr_t maxl)
{
if (((Scheme_Output_Port *)port)->print_handler)
do_handled_print(obj, port, scheme_print_proc, maxl);
else {
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = port;
p->ku.k.p2 = obj;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 2;
p->ku.k.p3 = NULL;
(void)scheme_top_level_do(print_to_port_k, 0);
}
}
void scheme_print(Scheme_Object *obj, Scheme_Object *port)
{
scheme_print_w_max(obj, port, -1);
}
static void *print_to_string_k(void)
{
Scheme_Thread *p = scheme_current_thread;
Scheme_Object *obj, *qq_depth;
intptr_t *len, maxl;
int iswrite;
obj = (Scheme_Object *)p->ku.k.p1;
len = (intptr_t *) mzALIAS p->ku.k.p2;
maxl = p->ku.k.i1;
iswrite = p->ku.k.i2;
qq_depth = (Scheme_Object *)p->ku.k.p3;
p->ku.k.p1 = NULL;
p->ku.k.p2 = NULL;
p->ku.k.p3 = NULL;
return (void *)print_to_string(obj, len, iswrite, NULL, maxl, qq_depth);
}
char *scheme_write_to_string_w_max(Scheme_Object *obj, intptr_t *len, intptr_t maxl)
{
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = obj;
p->ku.k.p2 = len;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 1;
p->ku.k.i3 = 0;
p->ku.k.p3 = NULL;
return (char *)scheme_top_level_do(print_to_string_k, 0);
}
char *scheme_write_to_string(Scheme_Object *obj, intptr_t *len)
{
return scheme_write_to_string_w_max(obj, len, -1);
}
char *scheme_display_to_string_w_max(Scheme_Object *obj, intptr_t *len, intptr_t maxl)
{
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = obj;
p->ku.k.p2 = len;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 0;
p->ku.k.i3 = 0;
p->ku.k.p3 = NULL;
return (char *)scheme_top_level_do(print_to_string_k, 0);
}
char *scheme_display_to_string(Scheme_Object *obj, intptr_t *len)
{
return scheme_display_to_string_w_max(obj, len, -1);
}
char *scheme_print_to_string_w_max(Scheme_Object *obj, intptr_t *len, intptr_t maxl)
{
Scheme_Thread *p = scheme_current_thread;
p->ku.k.p1 = obj;
p->ku.k.p2 = len;
p->ku.k.i1 = maxl;
p->ku.k.i2 = 2;
p->ku.k.i3 = 1;
p->ku.k.p3 = NULL;
return (char *)scheme_top_level_do(print_to_string_k, 0);
}
char *scheme_print_to_string(Scheme_Object *obj, intptr_t *len)
{
return scheme_print_to_string_w_max(obj, len, -1);
}
void
scheme_internal_write(Scheme_Object *obj, Scheme_Object *port)
{
print_to_port("write", obj, port, 1, -1, NULL);
}
void
scheme_internal_display(Scheme_Object *obj, Scheme_Object *port)
{
print_to_port("display", obj, port, 0, -1, NULL);
}
void
scheme_internal_print(Scheme_Object *obj, Scheme_Object *port, Scheme_Object *depth)
{
print_to_port("print", obj, port, 2, -1, depth);
}
#ifdef DO_STACK_CHECK
static int check_cycles(Scheme_Object *, int, Scheme_Hash_Table *ht, PrintParams *);
static Scheme_Object *check_cycle_k(void)
{
Scheme_Thread *p = scheme_current_thread;
Scheme_Object *o = (Scheme_Object *)p->ku.k.p1;
Scheme_Hash_Table *ht = (Scheme_Hash_Table *)p->ku.k.p2;
PrintParams *pp = (PrintParams *)p->ku.k.p3;
p->ku.k.p1 = NULL;
p->ku.k.p2 = NULL;
p->ku.k.p3 = NULL;
return check_cycles(o, p->ku.k.i1, ht, pp)
? scheme_true : scheme_false;
}
#endif
static int check_cycles(Scheme_Object *obj, int for_write, Scheme_Hash_Table *ht, PrintParams *pp)
/* Results: 0x2 = cycle bit
0x1 = unquote bit */
{
Scheme_Type t;
Scheme_Object *val;
int res, res2;
#ifdef DO_STACK_CHECK
{
#include "mzstkchk.h"
{
pp = copy_print_params(pp);
scheme_current_thread->ku.k.p1 = (void *)obj;
scheme_current_thread->ku.k.p2 = (void *)ht;
scheme_current_thread->ku.k.p3 = (void *)pp;
scheme_current_thread->ku.k.i1 = for_write;
return SCHEME_TRUEP(scheme_handle_stack_overflow(check_cycle_k));
}
}
#endif
SCHEME_USE_FUEL(1);
t = SCHEME_TYPE(obj);
if (SCHEME_PAIRP(obj)
|| SCHEME_MUTABLE_PAIRP(obj)
|| (pp->print_box && SCHEME_CHAPERONE_BOXP(obj))
|| SCHEME_CHAPERONE_VECTORP(obj)
|| ((SAME_TYPE(t, scheme_structure_type)
|| SAME_TYPE(t, scheme_proc_struct_type))
&& ((pp->print_struct
&& PRINTABLE_STRUCT(obj, pp))
|| scheme_is_writable_struct(obj)))
|| (pp->print_hash_table
&& (SAME_TYPE(t, scheme_hash_table_type)
|| SAME_TYPE(t, scheme_hash_tree_type)))) {
val = scheme_hash_get(ht, obj);
if (val)
return SCHEME_INT_VAL(val);
scheme_hash_set(ht, obj, scheme_make_integer(0x2));
} else
return 0;
if (SCHEME_PAIRP(obj)) {
res = check_cycles(SCHEME_CAR(obj), for_write, ht, pp);
if ((for_write < 3) && res)
return res;
res2 = check_cycles(SCHEME_CDR(obj), for_write, ht, pp);
res |= res2;
} else if (SCHEME_MUTABLE_PAIRP(obj)) {
res = check_cycles(SCHEME_CAR(obj), for_write, ht, pp);
if ((for_write < 3) && res)
return res;
res2 = check_cycles(SCHEME_CDR(obj), for_write, ht, pp);
res |= res2;
if (for_write >= 3)
res |= 0x1; /* always escape for qq printing */
} else if (SCHEME_CHAPERONE_BOXP(obj)) {
/* got here => printable */
Scheme_Object *v;
if (SCHEME_BOXP(obj))
v = SCHEME_BOX_VAL(obj);
else
v = scheme_unbox(obj);
res = check_cycles(v, for_write, ht, pp);
} else if (SCHEME_CHAPERONE_VECTORP(obj)) {
int i, len;
Scheme_Object *v;
if (SCHEME_VECTORP(obj))
len = SCHEME_VEC_SIZE(obj);
else
len = SCHEME_VEC_SIZE(SCHEME_CHAPERONE_VAL(obj));
res = 0;
for (i = 0; i < len; i++) {
if (SCHEME_VECTORP(obj))
v = SCHEME_VEC_ELS(obj)[i];
else
v = scheme_chaperone_vector_ref(obj, i);
res2 = check_cycles(v, for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
}
} else if (SAME_TYPE(t, scheme_structure_type)
|| SAME_TYPE(t, scheme_proc_struct_type)) {
if (scheme_is_writable_struct(obj)) {
if (pp->print_unreadable) {
res = check_cycles(writable_struct_subs(obj, for_write, pp), for_write, ht, pp);
if (for_write >= 3) {
Scheme_Object *kind;
kind = scheme_print_attribute_ref(obj);
if (kind) {
if (!strcmp(SCHEME_SYM_VAL(kind), "never"))
res |= 0x1;
if (!strcmp(SCHEME_SYM_VAL(kind), "always")
|| !strcmp(SCHEME_SYM_VAL(kind), "self"))
res -= (res & 0x1);
} else /* = "self" */
res -= (res & 0x1);
}
} else
res = 0;
} else {
/* got here => printable */
int i = SCHEME_STRUCT_NUM_SLOTS(obj);
if ((for_write >= 3) && !SCHEME_PREFABP(obj))
res = 0x1;
else
res = 0;
while (i--) {
if (scheme_inspector_sees_part(obj, pp->inspector, i)) {
res2 = check_cycles(((Scheme_Structure *)obj)->slots[i], for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
}
}
}
} else if (SCHEME_CHAPERONE_HASHTPx(obj)) {
/* got here => printable */
Scheme_Hash_Table *t;
Scheme_Object **keys, **vals, *val, *key;
int i;
if (SCHEME_NP_CHAPERONEP(obj))
t = (Scheme_Hash_Table *)SCHEME_CHAPERONE_VAL(obj);
else
t = (Scheme_Hash_Table *)obj;
keys = t->keys;
vals = t->vals;
res = 0;
for (i = 0; i < t->size; i++) {
if (vals[i]) {
key = keys[i];
if (!SAME_OBJ((Scheme_Object *)t, obj))
val = scheme_chaperone_hash_traversal_get(obj, key, &key);
else
val = vals[i];
if (val) {
res2 = check_cycles(key, for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
res2 = check_cycles(val, for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
}
}
}
} else if (SCHEME_CHAPERONE_HASHTRP(obj)) {
/* got here => printable */
Scheme_Hash_Tree *t;
Scheme_Object *key, *val;
int i;
if (SCHEME_NP_CHAPERONEP(obj))
t = (Scheme_Hash_Tree *)SCHEME_CHAPERONE_VAL(obj);
else
t = (Scheme_Hash_Tree *)obj;
res = 0;
i = scheme_hash_tree_next(t, -1);
while (i != -1) {
scheme_hash_tree_index(t, i, &key, &val);
if (!SAME_OBJ((Scheme_Object *)t, obj))
val = scheme_chaperone_hash_traversal_get(obj, key, &key);
res2 = check_cycles(key, for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
res2 = check_cycles(val, for_write, ht, pp);
res |= res2;
if ((for_write < 3) && res)
return res;
i = scheme_hash_tree_next(t, i);
}
} else
res = 0;
scheme_hash_set(ht, obj, scheme_make_integer(res));
return res;
}
/* The fast cycle-checker plays a dangerous game: it changes type
tags. No GCs can occur here, and no thread switches. If the fast
version takes to long, we back out to the general case. (We don't
even check for stack overflow, so keep the max limit low.)
A 0 result means no cycles, a 1 result means cycles, and a -1 result
means "unknown" (i.e., try slow path). When write is >= 3 (implying
qq-based printing), then a 0 result also implies that no expression
escapes are needed. */
#if !defined(MZ_USE_PLACES)
static int check_cycles_fast(Scheme_Object *obj, PrintParams *pp, int *fast_checker_counter, int write)
XFORM_SKIP_PROC
{
Scheme_Type t;
int cycle = 0;
t = SCHEME_TYPE(obj);
if (t < 0)
return 1;
if ((*fast_checker_counter)-- < 0)
return -1;
if (SCHEME_PAIRP(obj) || ((write < 3) && SCHEME_MUTABLE_PAIRP(obj))) {
obj->type = -t;
cycle = check_cycles_fast(SCHEME_CAR(obj), pp, fast_checker_counter, write);
if (!cycle)
cycle = check_cycles_fast(SCHEME_CDR(obj), pp, fast_checker_counter, write);
obj->type = t;
} else if (SCHEME_MUTABLE_PAIRP(obj)) {
if (write >= 3)
return -1;
obj->type = -t;
cycle = check_cycles_fast(SCHEME_CAR(obj), pp, fast_checker_counter, write);
if (!cycle)
cycle = check_cycles_fast(SCHEME_CDR(obj), pp, fast_checker_counter, write);
obj->type = t;
} else if (pp->print_box && SCHEME_BOXP(obj)) {
obj->type = -t;
cycle = check_cycles_fast(SCHEME_BOX_VAL(obj), pp, fast_checker_counter, write);
obj->type = t;
} else if (SCHEME_VECTORP(obj)) {
int i, len;
obj->type = -t;
len = SCHEME_VEC_SIZE(obj);
for (i = 0; i < len; i++) {
cycle = check_cycles_fast(SCHEME_VEC_ELS(obj)[i], pp, fast_checker_counter, write);
if (cycle)
break;
}
obj->type = t;
} else if (SAME_TYPE(t, scheme_structure_type)
|| SAME_TYPE(t, scheme_proc_struct_type)) {
if (scheme_is_writable_struct(obj)) {
if (!pp->print_unreadable)
cycle = 0;
else
/* don't bother with fast checks for writeable structs */
cycle = -1;
} else if (pp->print_struct && PRINTABLE_STRUCT(obj, pp)) {
int i = SCHEME_STRUCT_NUM_SLOTS(obj);
if ((write >= 3) && !SCHEME_PREFABP(obj))
return -1;
obj->type = -t;
while (i--) {
if (scheme_inspector_sees_part(obj, pp->inspector, i)) {
cycle = check_cycles_fast(((Scheme_Structure *)obj)->slots[i], pp, fast_checker_counter, write);
if (cycle)
break;
}
}
obj->type = t;
} else
cycle = 0;
} else if (pp->print_hash_table
&& SCHEME_HASHTPx(obj)) {
if (!((Scheme_Hash_Table *)obj)->count)
cycle = 0;
else
/* don't bother with fast checks for non-empty hash tables */
cycle = -1;
} else if (pp->print_hash_table
&& SCHEME_HASHTRP(obj)) {
if (!((Scheme_Hash_Tree *)obj)->count)
cycle = 0;
else
/* don't bother with fast checks for non-empty hash trees */
cycle = -1;
} else if (SCHEME_CHAPERONEP(obj))
cycle = -1; /* no fast checks for chaperones */
else
cycle = 0;
return cycle;
}
#endif
#ifdef DO_STACK_CHECK
static void setup_graph_table(Scheme_Object *obj, int for_write, Scheme_Hash_Table *ht, int *counter, PrintParams *pp);
static Scheme_Object *setup_graph_k(void)
{
Scheme_Thread *p = scheme_current_thread;
Scheme_Object *o = (Scheme_Object *)p->ku.k.p1;
Scheme_Hash_Table *ht = (Scheme_Hash_Table *)p->ku.k.p2;
int *counter = (int *)p->ku.k.p3;
PrintParams *pp = (PrintParams *)p->ku.k.p4;
int for_write = p->ku.k.i1;
p->ku.k.p1 = NULL;
p->ku.k.p2 = NULL;
p->ku.k.p3 = NULL;
p->ku.k.p4 = NULL;
setup_graph_table(o, for_write, ht, counter, pp);
return scheme_false;
}
#endif
static void setup_graph_table(Scheme_Object *obj, int for_write, Scheme_Hash_Table *ht,
int *counter, PrintParams *pp)
{
if (HAS_SUBSTRUCT(obj, ssQUICKp)) {
Scheme_Object *v;
#ifdef DO_STACK_CHECK
{
# include "mzstkchk.h"
{
if (pp)
pp = copy_print_params(pp);
scheme_current_thread->ku.k.p1 = (void *)obj;
scheme_current_thread->ku.k.p2 = (void *)ht;
scheme_current_thread->ku.k.p3 = (void *)counter;
scheme_current_thread->ku.k.p4 = (void *)pp;
scheme_current_thread->ku.k.i1 = for_write;
scheme_handle_stack_overflow(setup_graph_k);
return;
}
}
#endif
v = scheme_hash_get(ht, obj);
if (!v)
scheme_hash_set(ht, obj, (Scheme_Object *)0x1);
else {
if ((intptr_t)v == 1) {
(*counter) += 2;
scheme_hash_set(ht, obj, (Scheme_Object *)(intptr_t)*counter);
}
return;
}
} else
return;
SCHEME_USE_FUEL(1);
if (SCHEME_PAIRP(obj) || SCHEME_MUTABLE_PAIRP(obj)) {
setup_graph_table(SCHEME_CAR(obj), for_write, ht, counter, pp);
setup_graph_table(SCHEME_CDR(obj), for_write, ht, counter, pp);
} else if ((!pp || pp->print_box) && SCHEME_CHAPERONE_BOXP(obj)) {
Scheme_Object *v;
if (SCHEME_BOXP(obj))
v = SCHEME_BOX_VAL(obj);
else
v = scheme_unbox(obj);
setup_graph_table(v, for_write, ht, counter, pp);
} else if (SCHEME_CHAPERONE_VECTORP(obj)) {
int i, len;
Scheme_Object *v;
if (SCHEME_VECTORP(obj))
len = SCHEME_VEC_SIZE(obj);
else
len = SCHEME_VEC_SIZE(SCHEME_CHAPERONE_VAL(obj));
for (i = 0; i < len; i++) {
if (SCHEME_VECTORP(obj))
v = SCHEME_VEC_ELS(obj)[i];
else
v = scheme_chaperone_vector_ref(obj, i);
setup_graph_table(v, for_write, ht, counter, pp);
}
} else if (pp && SCHEME_CHAPERONE_STRUCTP(obj)) { /* got here => printable */
if (scheme_is_writable_struct(obj)) {
if (pp->print_unreadable) {
obj = writable_struct_subs(obj, for_write, pp);
setup_graph_table(obj, for_write, ht, counter, pp);
}
} else {
int i = SCHEME_STRUCT_NUM_SLOTS(obj);
while (i--) {
if (scheme_inspector_sees_part(obj, pp->inspector, i))
setup_graph_table(scheme_struct_ref(obj, i), for_write, ht, counter, pp);
}
}
} else if (pp && SCHEME_CHAPERONE_HASHTPx(obj)) { /* got here => printable */
Scheme_Hash_Table *t;
Scheme_Object **keys, **vals, *val, *key;
int i;
if (SCHEME_NP_CHAPERONEP(obj))
t = (Scheme_Hash_Table *)SCHEME_CHAPERONE_VAL(obj);
else
t = (Scheme_Hash_Table *)obj;
keys = t->keys;
vals = t->vals;
for (i = 0; i < t->size; i++) {
if (vals[i]) {
key = keys[i];
if (!SAME_OBJ((Scheme_Object *)t, obj))
val = scheme_chaperone_hash_traversal_get(obj, key, &key);
else
val = vals[i];
if (val) {
setup_graph_table(key, for_write, ht, counter, pp);
setup_graph_table(val, for_write, ht, counter, pp);
}
}
}
} else if (SCHEME_CHAPERONE_HASHTRP(obj)) {
/* got here => printable */
Scheme_Hash_Tree *t;
Scheme_Object *key, *val;
int i;
if (SCHEME_NP_CHAPERONEP(obj))
t = (Scheme_Hash_Tree *)SCHEME_CHAPERONE_VAL(obj);
else
t = (Scheme_Hash_Tree *)obj;
i = scheme_hash_tree_next(t, -1);
while (i != -1) {
scheme_hash_tree_index(t, i, &key, &val);
if (!SAME_OBJ((Scheme_Object *)t, obj))
val = scheme_chaperone_hash_traversal_get(obj, key, &key);
setup_graph_table(key, for_write, ht, counter, pp);
setup_graph_table(val, for_write, ht, counter, pp);
i = scheme_hash_tree_next(t, i);
}
}
}
#define CACHE_HT_SIZE_LIMIT 32
static Scheme_Hash_Table *setup_datum_graph(Scheme_Object *o, int for_write, void *for_print)
{
Scheme_Hash_Table *ht;
int counter = 1;
if (cache_ht) {
ht = cache_ht;
cache_ht = NULL;
} else
ht = scheme_make_hash_table(SCHEME_hash_ptr);
setup_graph_table(o, for_write, ht, &counter, (PrintParams *)for_print);
if (counter > 1)
return ht;
else {
if (ht->size < CACHE_HT_SIZE_LIMIT) {
int i;
for (i = 0; i < ht->size; i++) {
ht->keys[i] = NULL;
ht->vals[i] = NULL;
}
cache_ht = ht;
}
return NULL;
}
}
static char *
print_to_string(Scheme_Object *obj,
intptr_t * volatile len, int write,
Scheme_Object *port, intptr_t maxl,
Scheme_Object *qq_depth)
{
Scheme_Hash_Table * volatile ht;
Scheme_Hash_Table *uq_ht;
Scheme_Object *v;
char *ca;
int cycles;
Scheme_Config *config;
mz_jmp_buf escape;
volatile PrintParams params;
params.print_allocated = 50;
ca = (char *)scheme_malloc_atomic(params.print_allocated);
params.print_buffer = ca;
params.print_position = 0;
params.print_offset = 0;
params.print_maxlen = maxl;
params.print_port = port;
params.print_syntax = 0;
params.depth_delta = NULL;
params.printing_quoted = 0;
/* Getting print params can take a while, and they're irrelevant
for simple things like displaying numbers. So try a shortcut: */
if (!write
&& (SCHEME_NUMBERP(obj)
|| SCHEME_BYTE_STRINGP(obj)
|| SCHEME_CHAR_STRINGP(obj)
|| SCHEME_SYMBOLP(obj))) {
params.print_graph = 0;
params.print_box = 0;
params.print_struct = 0;
params.print_vec_shorthand = 0;
params.print_hash_table = 0;
params.print_unreadable = 1;
params.print_reader = 1;
params.print_long_bools = 0;
params.print_pair_curly = 0;
params.print_mpair_curly = 1;
params.can_read_pipe_quote = 1;
params.case_sens = 1;
params.inspector = scheme_false;
params.print_syntax = -1;
} else {
config = scheme_current_config();
v = scheme_get_param(config, MZCONFIG_PRINT_GRAPH);
params.print_graph = SCHEME_TRUEP(v);
v = scheme_get_param(config, MZCONFIG_PRINT_BOX);
params.print_box = SCHEME_TRUEP(v);
v = scheme_get_param(config, MZCONFIG_PRINT_STRUCT);
params.print_struct = SCHEME_TRUEP(v);
v = scheme_get_param(config, MZCONFIG_PRINT_VEC_SHORTHAND);
params.print_vec_shorthand = SCHEME_TRUEP(v);
v = scheme_get_param(config, MZCONFIG_PRINT_SYNTAX_WIDTH);
if (SCHEME_INTP(v))
params.print_syntax = SCHEME_INT_VAL(v);
else
params.print_syntax = -1;