summaryrefslogtreecommitdiff
path: root/graphics/asymptote/fundec.cc
blob: ed82463c2e4f86f9ffacd7c4525748489b95493e (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
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
/*****
 * fundec.h
 * Andy Hammerlindl 2002/8/29
 *
 * Defines the semantics for defining functions.  Both the newexp syntax, and
 * the abbreviated C-style function definition.
 *****/

#include "fundec.h"
#include "errormsg.h"
#include "coenv.h"
#include "stm.h"
#include "runtime.h"

namespace absyntax {

using namespace trans;
using namespace types;
using mem::list;

varinit *Default=new definit(nullPos);

void formal::prettyprint(ostream &out, Int indent)
{
  prettyname(out, keywordOnly ? "formal (keyword only)" : "formal", indent, getPos());

  base->prettyprint(out, indent+1);
  if (start) start->prettyprint(out, indent+1);
  if (defval) defval->prettyprint(out, indent+1);
}

types::formal formal::trans(coenv &e, bool encodeDefVal, bool tacit) {
  return types::formal(getType(e,tacit),
                       getName(),
                       encodeDefVal ? (bool) getDefaultValue() : 0,
                       getExplicit());
}

types::ty *formal::getType(coenv &e, bool tacit) {
  types::ty *bt = base->trans(e, tacit);
  types::ty *t = start ? start->getType(bt, e, tacit) : bt;
  if (t->kind == ty_void && !tacit) {
    em.error(getPos());
    em << "cannot declare parameters of type void";
    return primError();
  }

  return t;
}

void formal::addOps(coenv &e, record *r) {
  base->addOps(e, r);
  if (start)
    start->addOps(base->trans(e, true), e, r);
}

void formals::prettyprint(ostream &out, Int indent)
{
  prettyname(out, "formals",indent, getPos());

  for (list<formal *>::iterator p = fields.begin(); p != fields.end(); ++p)
    (*p)->prettyprint(out, indent+1);
}

void formals::addToSignature(signature& sig,
                             coenv &e, bool encodeDefVal, bool tacit)
{
  for (list<formal *>::iterator p = fields.begin(); p != fields.end(); ++p) {
    formal& f=**p;
    types::formal tf = f.trans(e, encodeDefVal, tacit);

    if (f.isKeywordOnly())
      sig.addKeywordOnly(tf);
    else
      sig.add(tf);
  }

  if (rest) {
    if (!tacit && rest->getDefaultValue()) {
      em.error(rest->getPos());
      em << "rest parameters cannot have default values";
    }
    sig.addRest(rest->trans(e, encodeDefVal, tacit));
  }
}

// Returns the types of each parameter as a signature.
// encodeDefVal means that it will also encode information regarding
// the default values into the signature
signature *formals::getSignature(coenv &e, bool encodeDefVal, bool tacit)
{
  signature *sig = new signature;
  addToSignature(*sig,e,encodeDefVal,tacit);
  return sig;
}


// Returns the corresponding function type, assuming it has a return
// value of types::ty *result.
function *formals::getType(types::ty *result, coenv &e,
                           bool encodeDefVal,
                           bool tacit)
{
  function *ft = new function(result);
  addToSignature(ft->sig,e,encodeDefVal,tacit);
  return ft;
}

void formals::addOps(coenv &e, record *r)
{
  for(list<formal *>::iterator p = fields.begin(); p != fields.end(); ++p)
    (*p)->addOps(e, r);

  if (rest)
    rest->addOps(e, r);
}

// Another helper class. Does an assignment, but relying only on the
// destination for the type.
class basicAssignExp : public exp {
  varEntry *dest;
  varinit *value;
public:
  basicAssignExp(position pos, varEntry *dest, varinit *value)
    : exp(pos), dest(dest), value(value) {}

  void prettyprint(ostream &out, Int indent) {
    prettyname(out, "basicAssignExp", indent, getPos());
  }

  types::ty *getType(coenv &) {
    return dest->getType();
  }

  types::ty *trans(coenv &e) {
    // This doesn't handle overloaded types for the destination.
    value->transToType(e, getType(e));
    dest->encode(WRITE, pos, e.c);
    return getType(e);
  }
};

void transDefault(coenv &e, position pos, varEntry *v, varinit *init) {
  // This roughly translates into the statement
  //   if (isDefault(x))
  //     x=init;
  // where x is the variable in v and isDefault is a function that tests
  // whether x is the default argument token.

  v->encode(READ, pos, e.c);

  label end = e.c.fwdLabel();
  e.c.useLabel(inst::jump_if_not_default, end);

  init->transToType(e, v->getType());
  v->encode(WRITE, pos, e.c);
  e.c.encodePop();

  e.c.defLabel(end);
}

void formal::transAsVar(coenv &e, Int index) {
  symbol name = getName();
  if (name) {
    trans::access *a = e.c.accessFormal(index);
    assert(a);

    // Suppress error messages because they will already be reported
    // when the formals are translated to yield the type earlier.
    types::ty *t = getType(e, true);
    varEntry *v = new varEntry(t, a, 0, getPos());

    // Translate the default argument before adding the formal to the
    // environment, consistent with the initializers of variables.
    if (defval)
      transDefault(e, getPos(), v, defval);

    e.e.addVar(name, v);
  }
}

void formal::createSymMap(AsymptoteLsp::SymbolContext* symContext)
{
#ifdef HAVE_LSP
  if (start)
  {
    start->createSymMap(symContext);
  }
#endif
}

#ifdef HAVE_LSP
std::pair<std::string, optional<std::string>> formal::fnInfo() const
{
  std::string typeName(static_cast<std::string>(*base));
  return start != nullptr ?
    std::make_pair(typeName, make_optional(static_cast<std::string>(start->getName()))) :
    std::make_pair(typeName, nullopt);
}
#endif

void formals::trans(coenv &e)
{
  Int index = 0;

  for (list<formal *>::iterator p=fields.begin(); p!=fields.end(); ++p) {
    (*p)->transAsVar(e, index);
    ++index;
  }

  if (rest) {
    rest->transAsVar(e, index);
    ++index;
  }
}

void formals::createSymMap(AsymptoteLsp::SymbolContext* symContext)
{
#ifdef HAVE_LSP
  for (auto& field: fields)
  {
    field->createSymMap(symContext);
  }

  if (rest)
  {
    rest->createSymMap(symContext);
  }
#endif
}

void formals::addArgumentsToFnInfo(AsymptoteLsp::FunctionInfo& fnInfo)
{
#ifdef HAVE_LSP
  for (auto const& field: fields)
  {
    fnInfo.arguments.emplace_back(field->fnInfo());
  }

  if (rest)
  {
    fnInfo.restArgs=rest->fnInfo();
  }
  // handle rest case as well
#endif
}

void fundef::prettyprint(ostream &out, Int indent)
{
  result->prettyprint(out, indent+1);
  params->prettyprint(out, indent+1);
  body->prettyprint(out, indent+1);
}

function *fundef::transType(coenv &e, bool tacit) {
  bool encodeDefVal=true;
  return params->getType(result->trans(e, tacit), e, encodeDefVal, tacit);
}

function *fundef::transTypeAndAddOps(coenv &e, record *r, bool tacit) {
  result->addOps(e,r);
  params->addOps(e,r);

  function *ft=transType(e, tacit);
  e.e.addFunctionOps(ft);
  if (r)
    r->e.addFunctionOps(ft);

  return ft;
}

void fundef::addArgumentsToFnInfo(AsymptoteLsp::FunctionInfo& fnInfo)
{
#ifdef HAVE_LSP
  params->addArgumentsToFnInfo(fnInfo);
  // handle rest case as well
#endif
}

varinit *fundef::makeVarInit(function *ft) {
  struct initializer : public varinit {
    fundef *f;
    function *ft;

    initializer(fundef *f, function *ft)
      : varinit(f->getPos()), f(f), ft(ft) {}

    void prettyprint(ostream &out, Int indent) {
      prettyname(out, "initializer", indent, getPos());
    }

    void transToType(coenv &e, types::ty *target) {
      assert(ft==target);
      f->baseTrans(e, ft);
    }
  };

  return new initializer(this, ft);
}

void fundef::baseTrans(coenv &e, types::function *ft)
{
  string name = id ? string(id) : string("<anonymous function>");

  // Create a new function environment.
  coder fc = e.c.newFunction(getPos(), name, ft);
  coenv fe(fc,e.e);

  // Translate the function.
  fe.e.beginScope();
  params->trans(fe);

  body->trans(fe);

  types::ty *rt = ft->result;
  if (rt->kind != ty_void &&
      rt->kind != ty_error &&
      !body->returns()) {
    em.error(body->getPos());
    em << "function must return a value";
  }

  fe.e.endScope();

  // Put an instance of the new function on the stack.
  vm::lambda *l = fe.c.close();
  e.c.encode(inst::pushclosure);
  e.c.encode(inst::makefunc, l);
}

types::ty *fundef::trans(coenv &e) {
  // I don't see how addFunctionOps can be useful here.
  // For instance, in
  //
  //   new void() {} == null
  //
  // callExp has to search for == before translating either argument, and the
  // operator cannot be added before translation.  (getType() is not allowed to
  // manipulate the environment.)
  // A new function expression is assigned to a variable, given as a return
  // value, or used as an argument to a function.  In any of these
  //
  // We must still addOps though, for the return type and formals.  ex:
  //
  //   new guide[] (guide f(int)) {
  //     return sequence(f, 10);
  //   };
  function *ft=transTypeAndAddOps(e, (record *)0, false);
  assert(ft);

  baseTrans(e, ft);

  return ft;
}

void fundef::createSymMap(AsymptoteLsp::SymbolContext* symContext)
{
#ifdef HAVE_LSP
  auto* declCtx(symContext->newContext<AsymptoteLsp::AddDeclContexts>(getPos().LineColumn()));
  params->createSymMap(declCtx);
  body->createSymMap(declCtx);
#endif
}

void fundec::prettyprint(ostream &out, Int indent)
{
  prettyindent(out, indent);
  out << "fundec '" << id << "'\n";

  fun.prettyprint(out, indent);
}

void fundec::trans(coenv &e)
{
  transAsField(e,0);
}

void fundec::transAsField(coenv &e, record *r)
{
  function *ft = fun.transTypeAndAddOps(e, r, false);
  assert(ft);

  createVar(getPos(), e, r, id, ft, fun.makeVarInit(ft));
}

void fundec::createSymMap(AsymptoteLsp::SymbolContext* symContext)
{
#ifdef HAVE_LSP
  AsymptoteLsp::FunctionInfo& fnInfo=symContext->symMap.addFunDef(static_cast<std::string>(id),
                                              getPos().LineColumn(),
                                              static_cast<std::string>(*fun.result));
  fun.addArgumentsToFnInfo(fnInfo);
  fun.createSymMap(symContext);
#endif
}

} // namespace absyntax