summaryrefslogtreecommitdiff
path: root/Build/source/utils/asymptote/entry.cc
blob: 22f973d914f6f3995c83250b6c369bdd7c076f89 (plain)
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
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
/*****
 * entry.cc
 * Andy Hammerlindl 2002/08/29
 *
 * All variables, built-in functions and user-defined functions reside
 * within the same namespace.  To keep track of all these, table of
 * "entries" is used.
 *****/

#include <iostream>

#include <cmath>
#include <utility>
#include "entry.h"
#include "coder.h"

using types::signature;

namespace trans {

bool entry::pr::check(action act, coder &c) {
  // We assume PUBLIC permissions and one's without an associated record are not
  // stored.
  assert(perm!=PUBLIC && r!=0);
  return c.inTranslation(r->getLevel()) ||
    (perm == RESTRICTED && act != WRITE);
}

void entry::pr::report(action act, position pos, coder &c) {
  if (!c.inTranslation(r->getLevel())) {
    if (perm == PRIVATE) {
      em.error(pos);
      em << "accessing private field outside of structure";
    }
    else if (perm == RESTRICTED && act == WRITE) {
      em.error(pos);
      em << "modifying non-public field outside of structure";
    }
  }
}

entry::entry(entry &e1, entry &e2) : where(e2.where), pos(e2.pos) {
  perms.insert(perms.end(), e1.perms.begin(), e1.perms.end());
  perms.insert(perms.end(), e2.perms.begin(), e2.perms.end());
}

entry::entry(entry &base, permission perm, record *r)
  : where(base.where), pos(base.pos) {
  perms.insert(perms.end(), base.perms.begin(), base.perms.end());
  addPerm(perm, r);
}

bool entry::checkPerm(action act, coder &c) {
  for (mem::list<pr>::iterator p=perms.begin(); p != perms.end(); ++p)
    if (!p->check(act, c))
      return false;
  return true;
}

void entry::reportPerm(action act, position pos, coder &c) {
  for (mem::list<pr>::iterator p=perms.begin(); p != perms.end(); ++p)
    p->report(act, pos, c);
}


varEntry::varEntry(varEntry &qv, varEntry &v)
  : entry(qv,v), t(v.t),
    location(new qualifiedAccess(qv.location, qv.getLevel(), v.location)) {}

frame *varEntry::getLevel() {
  record *r=dynamic_cast<record *>(t);
  assert(r);
  return r->getLevel();
}

void varEntry::encode(action act, position pos, coder &c) {
  reportPerm(act, pos, c);
  getLocation()->encode(act, pos, c);
}

void varEntry::encode(action act, position pos, coder &c, frame *top) {
  reportPerm(act, pos, c);
  getLocation()->encode(act, pos, c, top);
}

varEntry *qualifyVarEntry(varEntry *qv, varEntry *v)
{
  return qv ? (v ? new varEntry(*qv,*v) : qv) : v;
}


bool tenv::add(symbol *dest,
               names_t::value_type &x, varEntry *qualifier, coder &c)
{
  if (!x.second.empty()) {
    tyEntry *ent=x.second.front();
    if (ent->checkPerm(READ, c)) {
      enter(dest, qualifyTyEntry(qualifier, ent));
      return true;
    }
  }
  return false;
}

void tenv::add(tenv& source, varEntry *qualifier, coder &c) {
  // Enter each distinct (unshadowed) name,type pair.
  for(names_t::iterator p = source.names.begin(); p != source.names.end(); ++p)
    add(p->first, *p, qualifier, c);
}

bool tenv::add(symbol *src, symbol *dest,
               tenv& source, varEntry *qualifier, coder &c) {
  names_t::iterator p = source.names.find(src);
  if (p != source.names.end())
    return add(dest, *p, qualifier, c);
  else
    return false;
}

#ifdef NOHASH //{{{
void venv::add(venv& source, varEntry *qualifier, coder &c)
{
  // Enter each distinct (unshadowed) name,type pair.
  for(names_t::iterator p = source.names.begin();
      p != source.names.end();
      ++p)
    add(p->first, p->first, source, qualifier, c);
}

bool venv::add(symbol *src, symbol *dest,
               venv& source, varEntry *qualifier, coder &c)
{
  bool added=false;
  name_t &list=source.names[src];
  types::overloaded set; // To keep track of what is shadowed.

  for(name_iterator p = list.begin();
      p != list.end();
      ++p) {
    varEntry *v=*p;
    if (!equivalent(v->getType(), &set)) {
      set.addDistinct(v->getType(), src->special);
      if (v->checkPerm(READ, c)) {
        enter(dest, qualifyVarEntry(qualifier, v));
        added=true;
      }
    }
  }
  
  return added;
}

varEntry *venv::lookByType(symbol *name, ty *t)
{
  // Find first applicable function.
  name_t &list = names[name];
  for(name_iterator p = list.begin();
      p != list.end();
      ++p) {
    if (equivalent((*p)->getType(), t))
      return *p;
  }
  return 0;
}

void venv::list(record *module)
{
  bool where=settings::getSetting<bool>("where");
  // List all functions and variables.
  for(names_t::iterator N = names.begin(); N != names.end(); ++N) {
    symbol *s=N->first;
    name_t &list=names[s];
    for(name_iterator p = list.begin(); p != list.end(); ++p) {
      if(!module || (*p)->whereDefined() == module) {
        if(where) cout << (*p)->getPos();
        (*p)->getType()->printVar(cout, s);
        cout << ";\n";
      }
    }
  }
  flush(cout);
}

ty *venv::getType(symbol *name)
{
  types::overloaded set;

  // Find all applicable functions in scope.
  name_t &list = names[name];
  
  for(name_iterator p = list.begin();
      p != list.end();
      ++p) {
    set.addDistinct((*p)->getType(), name->special);
  }

  return set.simplify();
}
// }}}
#else // {{{

ostream& operator<< (ostream& out, const venv::key &k) {
  k.t->printVar(out, k.name);
  return out;
}

#if TEST_COLLISION
bool venv::keyeq::operator()(const key k, const key l) const {
  keyhash kh;
  if (kh(k)==kh(l)) {
    if (base(k,l))
      return true;
    else {
      cerr << "collision: " << endl;
      cerr << "  " << k << " -> " << kh(k) << endl;
      cerr << "  " << l << " -> " << kh(l) << endl;
    }
  }
  return false;
}
#else
bool venv::keyeq::operator()(const key k, const key l) const {
#if 0
  cerr << "k.t = " << k.t << " " << k << endl;
  cerr << "l.t = " << l.t << " " << l << endl;
#endif
  return k.name==l.name &&
    (k.name->special ? equivalent(k.t, l.t) :
     equivalent(k.t->getSignature(),
                l.t->getSignature()));
}
#endif

void venv::remove(key k) {
  //cerr << "removing: " << k << endl;
  value *&val=all[k];
  assert(val);
  if (val->next) {
    val->next->shadowed=false;
    value *temp=val->next;
    val->next=0;
    val=temp;
  }
  else
    all.erase(k);

  // Don't erase it from scopes.top() as that will be popped of the stack at
  // the end of endScope anyway.

  names[k.name].pop_front();
}

void venv::enter(symbol *name, varEntry *v) {
  assert(!scopes.empty());
  key k(name, v);
#ifdef DEBUG_ENTRY
  cout << "entering: " << k << " (t=" << k.t << ")" << endl;
#endif
  value *val=new value(v);

#ifdef DEBUG_ENTRY
  keymap::iterator p=all.find(k);
  if (p!=all.end()) {
    cout << "  over: " << p->first << endl;
  }
#endif
  
  val->next=all[k];
  if (val->next)
    val->next->shadowed=true;

  all[k]=val;
  scopes.top().insert(keymultimap::value_type(k,val));
  names[k.name].push_front(val);
}

void venv::add(venv& source, varEntry *qualifier, coder &c)
{
  // Enter each distinct (unshadowed) name,type pair.
  for(keymap::iterator p = source.all.begin(); p != source.all.end(); ++p) {
    varEntry *v=p->second->v;
    if (v->checkPerm(READ, c))
      enter(p->first.name, qualifyVarEntry(qualifier, v));
  }
}

bool venv::add(symbol *src, symbol *dest,
               venv& source, varEntry *qualifier, coder &c)
{
  bool added=false;
  values &list=source.names[src];

  for (values::iterator p=list.begin(); p!=list.end(); ++p)
    if (!(*p)->shadowed) {
      varEntry *v=(*p)->v;
      if (v->checkPerm(READ, c)) {
        enter(dest, qualifyVarEntry(qualifier, v));
        added=true;
      }
    }

  return added;
}


ty *venv::getType(symbol *name)
{
  //cerr << "getType: " << *name << endl;
  types::overloaded set;
  values &list=names[name];

  for (values::iterator p=list.begin(); p!=list.end(); ++p)
    if (!(*p)->shadowed)
      set.add((*p)->v->getType());

  return set.simplify();
}

void venv::listValues(symbol *name, values &vals, record *module)
{
  ostream& out=cout;

  bool where=settings::getSetting<bool>("where");
  for(values::iterator p = vals.begin(); p != vals.end(); ++p) {
    if(!module || (*p)->v->whereDefined() == module) {
      if(where) out << (*p)->v->getPos();
      if ((*p)->shadowed)
        out << "  <shadowed> ";
      (*p)->v->getType()->printVar(out, name);
      out << ";\n";
    }
  }
  flush(out);
}

void venv::list(record *module)
{
  // List all functions and variables.
  for(namemap::iterator N = names.begin(); N != names.end(); ++N)
    listValues(N->first, N->second,module);
}

void venv::completions(mem::list<symbol *>& l, string start)
{
  for(namemap::iterator N = names.begin(); N != names.end(); ++N)
    if (prefix(start, *(N->first)) && !N->second.empty())
      l.push_back(N->first);
}

#endif // }}}

} // namespace trans