-
Notifications
You must be signed in to change notification settings - Fork 131
/
sixmodelobject.c
275 lines (241 loc) · 11.2 KB
/
sixmodelobject.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
#define PARROT_IN_EXTENSION
#include "parrot/parrot.h"
#include "parrot/extend.h"
#include "sixmodelobject.h"
#include "repr_registry.h"
#include "knowhow_bootstrapper.h"
#include "serialization_context.h"
#include "reprs/KnowHOWREPR.h"
/* Cached type IDs. */
static INTVAL stable_id = 0;
static INTVAL smo_id = 0;
static INTVAL sc_id = 0;
/* Cached strings. */
static STRING *find_method_str = NULL;
static STRING *type_check_str = NULL;
static STRING *accepts_type_str = NULL;
static PMC *boot_type(PARROT_INTERP, PMC *knowhow, char *type_name, char *repr_name, INTVAL index) {
PMC *knowhow_how = STABLE(knowhow)->HOW;
PMC *meta_obj = REPR(knowhow_how)->allocate(interp, STABLE(knowhow_how));
PMC *sc = SC_get_sc(interp, Parrot_str_new_constant(interp, "__6MODEL_CORE__"));
REPROps *repr;
PMC *type_obj;
REPR(meta_obj)->initialize(interp, STABLE(meta_obj), OBJECT_BODY(meta_obj));
((KnowHOWREPRInstance *)PMC_data(meta_obj))->body.name = Parrot_str_new_constant(interp, type_name);
repr = REPR_get_by_name(interp, Parrot_str_new_constant(interp, repr_name));
type_obj = repr->type_object_for(interp, meta_obj);
STABLE(type_obj)->method_cache = ((KnowHOWREPRInstance *)PMC_data(meta_obj))->body.methods;
STABLE(type_obj)->mode_flags = METHOD_CACHE_AUTHORITATIVE;
VTABLE_set_pmc_keyed_int(interp, sc, index, type_obj);
SC_PMC(type_obj) = sc;
STABLE(type_obj)->sc = sc;
VTABLE_set_pmc_keyed_int(interp, sc, index+1, STABLE(type_obj)->HOW);
SC_PMC(STABLE(type_obj)->HOW) = sc;
STABLE(STABLE(type_obj)->HOW)->sc = sc;
return type_obj;
}
/* Initializes 6model and produces the KnowHOW core meta-object. */
void SixModelObject_initialize(PARROT_INTERP) {
PMC *initial_sc;
STRING *initial_sc_name;
PMC *global_context = Parrot_pmc_new(interp, enum_class_Hash);
PMC *knowhow;
PMC *knowhow_attribute;
PMC *boot_array, *boot_iter;
/* Look up and cache some type IDs and strings. */
stable_id = Parrot_pmc_get_type_str(interp, Parrot_str_new(interp, "STable", 0));
smo_id = Parrot_pmc_get_type_str(interp, Parrot_str_new(interp, "SixModelObject", 0));
sc_id = Parrot_pmc_get_type_str(interp, Parrot_str_new(interp, "SerializationContext", 0));
find_method_str = Parrot_str_new_constant(interp, "find_method");
type_check_str = Parrot_str_new_constant(interp, "type_check");
accepts_type_str = Parrot_str_new_constant(interp, "accepts_type");
/* Create initial core serialization context. */
initial_sc = Parrot_pmc_new(interp, sc_id);
initial_sc_name = Parrot_str_new(interp, "__6MODEL_CORE__", 0);
VTABLE_set_string_native(interp, initial_sc, initial_sc_name);
SC_set_sc(interp, initial_sc_name, initial_sc);
/* Build representations and initializes the representation registry. */
REPR_initialize_registry(interp);
/* Bootstrap the KnowHOW. */
knowhow = SixModelObject_bootstrap_knowhow(interp, initial_sc);
/* Set up the simple KnowHOWAttribute. */
knowhow_attribute = SixModelObject_setup_knowhow_attribute(interp, initial_sc, knowhow);
/* Set up the BOOT* types. */
boot_array = boot_type(interp, knowhow, "BOOTArray", "VMArray", 2);
/* TODO: BOOTHash types goes here with index 4. */
boot_iter = boot_type(interp, knowhow, "BOOTIter", "VMIter", 6);
/* Set boolification specs for the BOOT types. */
set_boolification_spec(interp, boot_array, BOOL_MODE_HAS_ELEMS, NULL);
set_boolification_spec(interp, boot_iter, BOOL_MODE_ITER, NULL);
/* Save the global context to the Parrot root namespace and store all the
* things we just created in it. */
VTABLE_set_pmc_keyed_str(interp, interp->root_namespace,
Parrot_str_new_constant(interp, "_GLOBAL_CONTEXT"), global_context);
VTABLE_set_pmc_keyed_str(interp, global_context,
Parrot_str_new_constant(interp, "KnowHOW"), knowhow);
VTABLE_set_pmc_keyed_str(interp, global_context,
Parrot_str_new_constant(interp, "KnowHOWAttribute"), knowhow_attribute);
VTABLE_set_pmc_keyed_str(interp, global_context,
Parrot_str_new_constant(interp, "BOOTArray"), boot_array);
VTABLE_set_pmc_keyed_str(interp, global_context,
Parrot_str_new_constant(interp, "BOOTIter"), boot_iter);
}
/* Sets the object that we'll wrap the next allocation in. */
static PMC *next_wrapper = NULL;
void set_wrapping_object(PMC *wrapper) {
next_wrapper = wrapper;
}
/* Takes an object and wraps it in a SixModelObject PMC. */
PMC * wrap_object(PARROT_INTERP, void *obj) {
PMC *obj_pmc;
if (next_wrapper) {
obj_pmc = next_wrapper;
next_wrapper = NULL;
}
else {
obj_pmc = Parrot_pmc_new_noinit(interp, smo_id);
}
PObj_custom_mark_SET(obj_pmc);
PObj_custom_destroy_SET(obj_pmc);
PMC_data(obj_pmc) = obj;
return obj_pmc;
}
void set_boolification_spec(PARROT_INTERP, PMC *target, INTVAL mode, PMC *method) {
STable *st = STABLE(decontainerize(interp, target));
/* Allocate and populate new boolification spec. */
BoolificationSpec *new_spec = mem_allocate_zeroed_typed(BoolificationSpec);
new_spec->mode = mode;
new_spec->method = method;
/* Free any existing spec and put the new one in place. */
if (st->boolification_spec)
mem_sys_free(st->boolification_spec);
st->boolification_spec = new_spec;
PARROT_GC_WRITE_BARRIER(interp, STABLE_PMC(target));
/*ST_SC_WRITE_BARRIER(st);*/
}
/* This is the default method dispatch code. It tries to use the
* v-table first, then falls back to a lookup. */
static PMC * default_find_method(PARROT_INTERP, PMC *obj, STRING *name, INTVAL hint) {
PMC *HOW, *meth, *result;
/* See if we can find it by hint. */
STable *st = STABLE(obj);
if (st->vtable && hint != NO_HINT && hint < st->vtable_length) {
/* Yes, just grab it from the v-table. */
return st->vtable[hint];
}
/* Try the by-name method cache, if the HOW published one. */
if (st->method_cache) {
PMC *cached_method = VTABLE_get_pmc_keyed_str(interp, st->method_cache, name);
if (!PMC_IS_NULL(cached_method))
return cached_method;
else if (st->mode_flags & METHOD_CACHE_AUTHORITATIVE)
return PMCNULL;
}
/* Otherwise delegate to the HOW. */
HOW = st->HOW;
meth = STABLE(HOW)->find_method(interp, HOW, find_method_str, NO_HINT);
/* Call it to get the method to call. */
if (PMC_IS_NULL(meth)) {
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"No method cache and no find_method method in meta-object");
}
else {
PMC *old_ctx = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
PMC *cappy = Parrot_pmc_new(interp, enum_class_CallContext);
VTABLE_push_pmc(interp, cappy, HOW);
VTABLE_push_pmc(interp, cappy, obj);
VTABLE_push_string(interp, cappy, name);
Parrot_pcc_invoke_from_sig_object(interp, meth, cappy);
cappy = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
Parrot_pcc_set_signature(interp, CURRENT_CONTEXT(interp), old_ctx);
result = VTABLE_get_pmc_keyed_int(interp, cappy, 0);
}
return result;
}
/* This is the default type checking implementation. Note: it may also
* be the only one we end up with since the HOW is the authority here.
* So we may end up not calling this through the S-Table in the end. */
static INTVAL default_type_check (PARROT_INTERP, PMC *to_check, PMC *wanted) {
PMC *HOW, *meth, *result;
STable *st = STABLE(to_check);
INTVAL type_check_mode = STABLE(wanted)->mode_flags & TYPE_CHECK_CACHE_FLAG_MASK;
if (st->type_check_cache) {
/* We have the cache, so just look for the type object we
* want to be in there. */
INTVAL i;
for (i = 0; i < st->type_check_cache_length; i++)
if (st->type_check_cache[i] == wanted)
return 1;
/* If the type check cache is definitive, we're done. */
if ((type_check_mode & TYPE_CHECK_CACHE_THEN_METHOD) == 0 &&
(type_check_mode & TYPE_CHECK_NEEDS_ACCEPTS) == 0)
return 0;
}
/* If we get here, need to call .^type_check on the value we're
* checking. */
if (!st->type_check_cache || (type_check_mode & TYPE_CHECK_CACHE_THEN_METHOD))
{
PMC *HOW = st->HOW;
PMC *meth = STABLE(HOW)->find_method(interp, HOW, type_check_str, NO_HINT);
PMC *result_pmc;
INTVAL result;
if (PMC_IS_NULL(meth)) {
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"No type check cache and no type_check method in meta-object");
}
Parrot_ext_call(interp, meth, "PiPP->P", HOW, to_check, wanted, &result_pmc);
result = VTABLE_get_bool(interp, result_pmc);
if (result)
return result;
}
/* If the flag to call .accepts_type on the target value is set, do so. */
if (type_check_mode & TYPE_CHECK_NEEDS_ACCEPTS) {
PMC *HOW = STABLE(wanted)->HOW;
PMC *meth = STABLE(HOW)->find_method(interp, HOW, accepts_type_str, NO_HINT);
PMC *result_pmc;
if (PMC_IS_NULL(meth)) {
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"Expected accepts_type method, but none found in meta-object");
}
Parrot_ext_call(interp, meth, "PiPP->P", HOW, wanted, to_check, &result_pmc);
return VTABLE_get_bool(interp, result_pmc);
}
/* If we get here, type check failed. */
return 0;
}
/* Creates an STable that references the given REPR and HOW. */
PMC * create_stable(PARROT_INTERP, REPROps *REPR, PMC *HOW) {
PMC *st_pmc = Parrot_pmc_new_init(interp, stable_id, HOW);
STABLE_STRUCT(st_pmc)->REPR = REPR;
STABLE_STRUCT(st_pmc)->WHO = PMCNULL;
STABLE_STRUCT(st_pmc)->find_method = default_find_method;
STABLE_STRUCT(st_pmc)->type_check = default_type_check;
STABLE_STRUCT(st_pmc)->stable_pmc = st_pmc;
return st_pmc;
}
/* Performs a decontainerizing operation on the passed variable, using
* the 6model container API. */
PMC * decontainerize(PARROT_INTERP, PMC *var) {
if (var->vtable->base_type == smo_id) {
ContainerSpec *spec = STABLE(var)->container_spec;
if (spec && IS_CONCRETE(var)) {
if (!PMC_IS_NULL(spec->value_slot.class_handle)) {
/* Just get slot. */
return VTABLE_get_attr_keyed(interp, var, spec->value_slot.class_handle,
spec->value_slot.attr_name);
}
else {
/* Invoke FETCH method. */
PMC *old_ctx = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
PMC *meth = spec->fetch_method;
PMC *cappy = Parrot_pmc_new(interp, enum_class_CallContext);
VTABLE_push_pmc(interp, cappy, var);
Parrot_pcc_invoke_from_sig_object(interp, meth, cappy);
cappy = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
Parrot_pcc_set_signature(interp, CURRENT_CONTEXT(interp), old_ctx);
return VTABLE_get_pmc_keyed_int(interp, cappy, 0);
}
}
}
return var;
}