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
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
|
/* Convert types from GDB to GCC
Copyright (C) 2014-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbtypes.h"
#include "compile-internal.h"
/* An object that maps a gdb type to a gcc type. */
struct type_map_instance
{
/* The gdb type. */
struct type *type;
/* The corresponding gcc type handle. */
gcc_type gcc_type;
};
/* Hash a type_map_instance. */
static hashval_t
hash_type_map_instance (const void *p)
{
const struct type_map_instance *inst = p;
return htab_hash_pointer (inst->type);
}
/* Check two type_map_instance objects for equality. */
static int
eq_type_map_instance (const void *a, const void *b)
{
const struct type_map_instance *insta = a;
const struct type_map_instance *instb = b;
return insta->type == instb->type;
}
/* Insert an entry into the type map associated with CONTEXT that maps
from the gdb type TYPE to the gcc type GCC_TYPE. It is ok for a
given type to be inserted more than once, provided that the exact
same association is made each time. This simplifies how type
caching works elsewhere in this file -- see how struct type caching
is handled. */
static void
insert_type (struct compile_c_instance *context, struct type *type,
gcc_type gcc_type)
{
struct type_map_instance inst, *add;
void **slot;
inst.type = type;
inst.gcc_type = gcc_type;
slot = htab_find_slot (context->type_map, &inst, INSERT);
add = *slot;
/* The type might have already been inserted in order to handle
recursive types. */
if (add != NULL && add->gcc_type != gcc_type)
error (_("Unexpected type id from GCC, check you use recent enough GCC."));
if (add == NULL)
{
add = XNEW (struct type_map_instance);
*add = inst;
*slot = add;
}
}
/* Convert a pointer type to its gcc representation. */
static gcc_type
convert_pointer (struct compile_c_instance *context, struct type *type)
{
gcc_type target = convert_type (context, TYPE_TARGET_TYPE (type));
return C_CTX (context)->c_ops->build_pointer_type (C_CTX (context),
target);
}
/* Convert an array type to its gcc representation. */
static gcc_type
convert_array (struct compile_c_instance *context, struct type *type)
{
gcc_type element_type;
struct type *range = TYPE_INDEX_TYPE (type);
element_type = convert_type (context, TYPE_TARGET_TYPE (type));
if (TYPE_LOW_BOUND_KIND (range) != PROP_CONST)
return C_CTX (context)->c_ops->error (C_CTX (context),
_("array type with non-constant"
" lower bound is not supported"));
if (TYPE_LOW_BOUND (range) != 0)
return C_CTX (context)->c_ops->error (C_CTX (context),
_("cannot convert array type with "
"non-zero lower bound to C"));
if (TYPE_HIGH_BOUND_KIND (range) == PROP_LOCEXPR
|| TYPE_HIGH_BOUND_KIND (range) == PROP_LOCLIST)
{
gcc_type result;
char *upper_bound;
if (TYPE_VECTOR (type))
return C_CTX (context)->c_ops->error (C_CTX (context),
_("variably-sized vector type"
" is not supported"));
upper_bound = c_get_range_decl_name (&TYPE_RANGE_DATA (range)->high);
result = C_CTX (context)->c_ops->build_vla_array_type (C_CTX (context),
element_type,
upper_bound);
xfree (upper_bound);
return result;
}
else
{
LONGEST low_bound, high_bound, count;
if (get_array_bounds (type, &low_bound, &high_bound) == 0)
count = -1;
else
{
gdb_assert (low_bound == 0); /* Ensured above. */
count = high_bound + 1;
}
if (TYPE_VECTOR (type))
return C_CTX (context)->c_ops->build_vector_type (C_CTX (context),
element_type,
count);
return C_CTX (context)->c_ops->build_array_type (C_CTX (context),
element_type, count);
}
}
/* Convert a struct or union type to its gcc representation. */
static gcc_type
convert_struct_or_union (struct compile_c_instance *context, struct type *type)
{
int i;
gcc_type result;
/* First we create the resulting type and enter it into our hash
table. This lets recursive types work. */
if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
result = C_CTX (context)->c_ops->build_record_type (C_CTX (context));
else
{
gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
result = C_CTX (context)->c_ops->build_union_type (C_CTX (context));
}
insert_type (context, type, result);
for (i = 0; i < TYPE_NFIELDS (type); ++i)
{
gcc_type field_type;
unsigned long bitsize = TYPE_FIELD_BITSIZE (type, i);
field_type = convert_type (context, TYPE_FIELD_TYPE (type, i));
if (bitsize == 0)
bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (type, i));
C_CTX (context)->c_ops->build_add_field (C_CTX (context), result,
TYPE_FIELD_NAME (type, i),
field_type,
bitsize,
TYPE_FIELD_BITPOS (type, i));
}
C_CTX (context)->c_ops->finish_record_or_union (C_CTX (context), result,
TYPE_LENGTH (type));
return result;
}
/* Convert an enum type to its gcc representation. */
static gcc_type
convert_enum (struct compile_c_instance *context, struct type *type)
{
gcc_type int_type, result;
int i;
struct gcc_c_context *ctx = C_CTX (context);
int_type = ctx->c_ops->int_type (ctx,
TYPE_UNSIGNED (type),
TYPE_LENGTH (type));
result = ctx->c_ops->build_enum_type (ctx, int_type);
for (i = 0; i < TYPE_NFIELDS (type); ++i)
{
ctx->c_ops->build_add_enum_constant (ctx,
result,
TYPE_FIELD_NAME (type, i),
TYPE_FIELD_ENUMVAL (type, i));
}
ctx->c_ops->finish_enum_type (ctx, result);
return result;
}
/* Convert a function type to its gcc representation. */
static gcc_type
convert_func (struct compile_c_instance *context, struct type *type)
{
int i;
gcc_type result, return_type;
struct gcc_type_array array;
int is_varargs = TYPE_VARARGS (type) || !TYPE_PROTOTYPED (type);
/* This approach means we can't make self-referential function
types. Those are impossible in C, though. */
return_type = convert_type (context, TYPE_TARGET_TYPE (type));
array.n_elements = TYPE_NFIELDS (type);
array.elements = XNEWVEC (gcc_type, TYPE_NFIELDS (type));
for (i = 0; i < TYPE_NFIELDS (type); ++i)
array.elements[i] = convert_type (context, TYPE_FIELD_TYPE (type, i));
result = C_CTX (context)->c_ops->build_function_type (C_CTX (context),
return_type,
&array, is_varargs);
xfree (array.elements);
return result;
}
/* Convert an integer type to its gcc representation. */
static gcc_type
convert_int (struct compile_c_instance *context, struct type *type)
{
return C_CTX (context)->c_ops->int_type (C_CTX (context),
TYPE_UNSIGNED (type),
TYPE_LENGTH (type));
}
/* Convert a floating-point type to its gcc representation. */
static gcc_type
convert_float (struct compile_c_instance *context, struct type *type)
{
return C_CTX (context)->c_ops->float_type (C_CTX (context),
TYPE_LENGTH (type));
}
/* Convert the 'void' type to its gcc representation. */
static gcc_type
convert_void (struct compile_c_instance *context, struct type *type)
{
return C_CTX (context)->c_ops->void_type (C_CTX (context));
}
/* Convert a boolean type to its gcc representation. */
static gcc_type
convert_bool (struct compile_c_instance *context, struct type *type)
{
return C_CTX (context)->c_ops->bool_type (C_CTX (context));
}
/* Convert a qualified type to its gcc representation. */
static gcc_type
convert_qualified (struct compile_c_instance *context, struct type *type)
{
struct type *unqual = make_unqualified_type (type);
gcc_type unqual_converted;
int quals = 0;
unqual_converted = convert_type (context, unqual);
if (TYPE_CONST (type))
quals |= GCC_QUALIFIER_CONST;
if (TYPE_VOLATILE (type))
quals |= GCC_QUALIFIER_VOLATILE;
if (TYPE_RESTRICT (type))
quals |= GCC_QUALIFIER_RESTRICT;
return C_CTX (context)->c_ops->build_qualified_type (C_CTX (context),
unqual_converted,
quals);
}
/* Convert a complex type to its gcc representation. */
static gcc_type
convert_complex (struct compile_c_instance *context, struct type *type)
{
gcc_type base = convert_type (context, TYPE_TARGET_TYPE (type));
return C_CTX (context)->c_ops->build_complex_type (C_CTX (context), base);
}
/* A helper function which knows how to convert most types from their
gdb representation to the corresponding gcc form. This examines
the TYPE and dispatches to the appropriate conversion function. It
returns the gcc type. */
static gcc_type
convert_type_basic (struct compile_c_instance *context, struct type *type)
{
/* If we are converting a qualified type, first convert the
unqualified type and then apply the qualifiers. */
if ((TYPE_INSTANCE_FLAGS (type) & (TYPE_INSTANCE_FLAG_CONST
| TYPE_INSTANCE_FLAG_VOLATILE
| TYPE_INSTANCE_FLAG_RESTRICT)) != 0)
return convert_qualified (context, type);
switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
return convert_pointer (context, type);
case TYPE_CODE_ARRAY:
return convert_array (context, type);
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
return convert_struct_or_union (context, type);
case TYPE_CODE_ENUM:
return convert_enum (context, type);
case TYPE_CODE_FUNC:
return convert_func (context, type);
case TYPE_CODE_INT:
return convert_int (context, type);
case TYPE_CODE_FLT:
return convert_float (context, type);
case TYPE_CODE_VOID:
return convert_void (context, type);
case TYPE_CODE_BOOL:
return convert_bool (context, type);
case TYPE_CODE_COMPLEX:
return convert_complex (context, type);
}
return C_CTX (context)->c_ops->error (C_CTX (context),
_("cannot convert gdb type "
"to gcc type"));
}
/* See compile-internal.h. */
gcc_type
convert_type (struct compile_c_instance *context, struct type *type)
{
struct type_map_instance inst, *found;
gcc_type result;
/* We don't ever have to deal with typedefs in this code, because
those are only needed as symbols by the C compiler. */
CHECK_TYPEDEF (type);
inst.type = type;
found = htab_find (context->type_map, &inst);
if (found != NULL)
return found->gcc_type;
result = convert_type_basic (context, type);
insert_type (context, type, result);
return result;
}
/* Delete the compiler instance C. */
static void
delete_instance (struct compile_instance *c)
{
struct compile_c_instance *context = (struct compile_c_instance *) c;
context->base.fe->ops->destroy (context->base.fe);
htab_delete (context->type_map);
if (context->symbol_err_map != NULL)
htab_delete (context->symbol_err_map);
xfree (context);
}
/* See compile-internal.h. */
struct compile_instance *
new_compile_instance (struct gcc_c_context *fe)
{
struct compile_c_instance *result = XCNEW (struct compile_c_instance);
result->base.fe = &fe->base;
result->base.destroy = delete_instance;
result->base.gcc_target_options = ("-std=gnu11"
/* Otherwise the .o file may need
"_Unwind_Resume" and
"__gcc_personality_v0". */
" -fno-exceptions");
result->type_map = htab_create_alloc (10, hash_type_map_instance,
eq_type_map_instance,
xfree, xcalloc, xfree);
fe->c_ops->set_callbacks (fe, gcc_convert_symbol,
gcc_symbol_address, result);
return &result->base;
}
|