summaryrefslogtreecommitdiffstats
path: root/src/etc/gdb_providers.py
blob: c351c3450f582d630e7d4708728ce71a336c3431 (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
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
438
439
440
441
442
from sys import version_info

import gdb

if version_info[0] >= 3:
    xrange = range

ZERO_FIELD = "__0"
FIRST_FIELD = "__1"


def unwrap_unique_or_non_null(unique_or_nonnull):
    # BACKCOMPAT: rust 1.32
    # https://github.com/rust-lang/rust/commit/7a0911528058e87d22ea305695f4047572c5e067
    # BACKCOMPAT: rust 1.60
    # https://github.com/rust-lang/rust/commit/2a91eeac1a2d27dd3de1bf55515d765da20fd86f
    ptr = unique_or_nonnull["pointer"]
    return ptr if ptr.type.code == gdb.TYPE_CODE_PTR else ptr[ptr.type.fields()[0]]


class EnumProvider:
    def __init__(self, valobj):
        content = valobj[valobj.type.fields()[0]]
        fields = content.type.fields()
        self.empty = len(fields) == 0
        if not self.empty:
            if len(fields) == 1:
                discriminant = 0
            else:
                discriminant = int(content[fields[0]]) + 1
            self.active_variant = content[fields[discriminant]]
            self.name = fields[discriminant].name
            self.full_name = "{}::{}".format(valobj.type.name, self.name)
        else:
            self.full_name = valobj.type.name

    def to_string(self):
        return self.full_name

    def children(self):
        if not self.empty:
            yield self.name, self.active_variant


class StdStringProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        vec = valobj["vec"]
        self.length = int(vec["len"])
        self.data_ptr = unwrap_unique_or_non_null(vec["buf"]["ptr"])

    def to_string(self):
        return self.data_ptr.lazy_string(encoding="utf-8", length=self.length)

    @staticmethod
    def display_hint():
        return "string"


class StdOsStringProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        buf = self.valobj["inner"]["inner"]
        is_windows = "Wtf8Buf" in buf.type.name
        vec = buf[ZERO_FIELD] if is_windows else buf

        self.length = int(vec["len"])
        self.data_ptr = unwrap_unique_or_non_null(vec["buf"]["ptr"])

    def to_string(self):
        return self.data_ptr.lazy_string(encoding="utf-8", length=self.length)

    def display_hint(self):
        return "string"


class StdStrProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        self.length = int(valobj["length"])
        self.data_ptr = valobj["data_ptr"]

    def to_string(self):
        return self.data_ptr.lazy_string(encoding="utf-8", length=self.length)

    @staticmethod
    def display_hint():
        return "string"

def _enumerate_array_elements(element_ptrs):
    for (i, element_ptr) in enumerate(element_ptrs):
        key = "[{}]".format(i)
        element = element_ptr.dereference()

        try:
            # rust-lang/rust#64343: passing deref expr to `str` allows
            # catching exception on garbage pointer
            str(element)
        except RuntimeError:
            yield key, "inaccessible"

            break

        yield key, element

class StdSliceProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        self.length = int(valobj["length"])
        self.data_ptr = valobj["data_ptr"]

    def to_string(self):
        return "{}(size={})".format(self.valobj.type, self.length)

    def children(self):
        return _enumerate_array_elements(
            self.data_ptr + index for index in xrange(self.length)
        )

    @staticmethod
    def display_hint():
        return "array"

class StdVecProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        self.length = int(valobj["len"])
        self.data_ptr = unwrap_unique_or_non_null(valobj["buf"]["ptr"])

    def to_string(self):
        return "Vec(size={})".format(self.length)

    def children(self):
        return _enumerate_array_elements(
            self.data_ptr + index for index in xrange(self.length)
        )

    @staticmethod
    def display_hint():
        return "array"


class StdVecDequeProvider:
    def __init__(self, valobj):
        self.valobj = valobj
        self.head = int(valobj["head"])
        self.tail = int(valobj["tail"])
        self.cap = int(valobj["buf"]["cap"])
        self.data_ptr = unwrap_unique_or_non_null(valobj["buf"]["ptr"])
        if self.head >= self.tail:
            self.size = self.head - self.tail
        else:
            self.size = self.cap + self.head - self.tail

    def to_string(self):
        return "VecDeque(size={})".format(self.size)

    def children(self):
        return _enumerate_array_elements(
            (self.data_ptr + ((self.tail + index) % self.cap)) for index in xrange(self.size)
        )

    @staticmethod
    def display_hint():
        return "array"


class StdRcProvider:
    def __init__(self, valobj, is_atomic=False):
        self.valobj = valobj
        self.is_atomic = is_atomic
        self.ptr = unwrap_unique_or_non_null(valobj["ptr"])
        self.value = self.ptr["data" if is_atomic else "value"]
        self.strong = self.ptr["strong"]["v" if is_atomic else "value"]["value"]
        self.weak = self.ptr["weak"]["v" if is_atomic else "value"]["value"] - 1

    def to_string(self):
        if self.is_atomic:
            return "Arc(strong={}, weak={})".format(int(self.strong), int(self.weak))
        else:
            return "Rc(strong={}, weak={})".format(int(self.strong), int(self.weak))

    def children(self):
        yield "value", self.value
        yield "strong", self.strong
        yield "weak", self.weak


class StdCellProvider:
    def __init__(self, valobj):
        self.value = valobj["value"]["value"]

    def to_string(self):
        return "Cell"

    def children(self):
        yield "value", self.value


class StdRefProvider:
    def __init__(self, valobj):
        self.value = valobj["value"].dereference()
        self.borrow = valobj["borrow"]["borrow"]["value"]["value"]

    def to_string(self):
        borrow = int(self.borrow)
        if borrow >= 0:
            return "Ref(borrow={})".format(borrow)
        else:
            return "Ref(borrow_mut={})".format(-borrow)

    def children(self):
        yield "*value", self.value
        yield "borrow", self.borrow


class StdRefCellProvider:
    def __init__(self, valobj):
        self.value = valobj["value"]["value"]
        self.borrow = valobj["borrow"]["value"]["value"]

    def to_string(self):
        borrow = int(self.borrow)
        if borrow >= 0:
            return "RefCell(borrow={})".format(borrow)
        else:
            return "RefCell(borrow_mut={})".format(-borrow)

    def children(self):
        yield "value", self.value
        yield "borrow", self.borrow


class StdNonZeroNumberProvider:
    def __init__(self, valobj):
        fields = valobj.type.fields()
        assert len(fields) == 1
        field = list(fields)[0]
        self.value = str(valobj[field.name])

    def to_string(self):
        return self.value


# Yields children (in a provider's sense of the word) for a BTreeMap.
def children_of_btree_map(map):
    # Yields each key/value pair in the node and in any child nodes.
    def children_of_node(node_ptr, height):
        def cast_to_internal(node):
            internal_type_name = node.type.target().name.replace("LeafNode", "InternalNode", 1)
            internal_type = gdb.lookup_type(internal_type_name)
            return node.cast(internal_type.pointer())

        if node_ptr.type.name.startswith("alloc::collections::btree::node::BoxedNode<"):
            # BACKCOMPAT: rust 1.49
            node_ptr = node_ptr["ptr"]
        node_ptr = unwrap_unique_or_non_null(node_ptr)
        leaf = node_ptr.dereference()
        keys = leaf["keys"]
        vals = leaf["vals"]
        edges = cast_to_internal(node_ptr)["edges"] if height > 0 else None
        length = leaf["len"]

        for i in xrange(0, length + 1):
            if height > 0:
                child_ptr = edges[i]["value"]["value"]
                for child in children_of_node(child_ptr, height - 1):
                    yield child
            if i < length:
                # Avoid "Cannot perform pointer math on incomplete type" on zero-sized arrays.
                key_type_size = keys.type.sizeof
                val_type_size = vals.type.sizeof
                key = keys[i]["value"]["value"] if key_type_size > 0 else gdb.parse_and_eval("()")
                val = vals[i]["value"]["value"] if val_type_size > 0 else gdb.parse_and_eval("()")
                yield key, val

    if map["length"] > 0:
        root = map["root"]
        if root.type.name.startswith("core::option::Option<"):
            root = root.cast(gdb.lookup_type(root.type.name[21:-1]))
        node_ptr = root["node"]
        height = root["height"]
        for child in children_of_node(node_ptr, height):
            yield child


class StdBTreeSetProvider:
    def __init__(self, valobj):
        self.valobj = valobj

    def to_string(self):
        return "BTreeSet(size={})".format(self.valobj["map"]["length"])

    def children(self):
        inner_map = self.valobj["map"]
        for i, (child, _) in enumerate(children_of_btree_map(inner_map)):
            yield "[{}]".format(i), child

    @staticmethod
    def display_hint():
        return "array"


class StdBTreeMapProvider:
    def __init__(self, valobj):
        self.valobj = valobj

    def to_string(self):
        return "BTreeMap(size={})".format(self.valobj["length"])

    def children(self):
        for i, (key, val) in enumerate(children_of_btree_map(self.valobj)):
            yield "key{}".format(i), key
            yield "val{}".format(i), val

    @staticmethod
    def display_hint():
        return "map"


# BACKCOMPAT: rust 1.35
class StdOldHashMapProvider:
    def __init__(self, valobj, show_values=True):
        self.valobj = valobj
        self.show_values = show_values

        self.table = self.valobj["table"]
        self.size = int(self.table["size"])
        self.hashes = self.table["hashes"]
        self.hash_uint_type = self.hashes.type
        self.hash_uint_size = self.hashes.type.sizeof
        self.modulo = 2 ** self.hash_uint_size
        self.data_ptr = self.hashes[ZERO_FIELD]["pointer"]

        self.capacity_mask = int(self.table["capacity_mask"])
        self.capacity = (self.capacity_mask + 1) % self.modulo

        marker = self.table["marker"].type
        self.pair_type = marker.template_argument(0)
        self.pair_type_size = self.pair_type.sizeof

        self.valid_indices = []
        for idx in range(self.capacity):
            data_ptr = self.data_ptr.cast(self.hash_uint_type.pointer())
            address = data_ptr + idx
            hash_uint = address.dereference()
            hash_ptr = hash_uint[ZERO_FIELD]["pointer"]
            if int(hash_ptr) != 0:
                self.valid_indices.append(idx)

    def to_string(self):
        if self.show_values:
            return "HashMap(size={})".format(self.size)
        else:
            return "HashSet(size={})".format(self.size)

    def children(self):
        start = int(self.data_ptr) & ~1

        hashes = self.hash_uint_size * self.capacity
        align = self.pair_type_size
        len_rounded_up = (((((hashes + align) % self.modulo - 1) % self.modulo) & ~(
                (align - 1) % self.modulo)) % self.modulo - hashes) % self.modulo

        pairs_offset = hashes + len_rounded_up
        pairs_start = gdb.Value(start + pairs_offset).cast(self.pair_type.pointer())

        for index in range(self.size):
            table_index = self.valid_indices[index]
            idx = table_index & self.capacity_mask
            element = (pairs_start + idx).dereference()
            if self.show_values:
                yield "key{}".format(index), element[ZERO_FIELD]
                yield "val{}".format(index), element[FIRST_FIELD]
            else:
                yield "[{}]".format(index), element[ZERO_FIELD]

    def display_hint(self):
        return "map" if self.show_values else "array"


class StdHashMapProvider:
    def __init__(self, valobj, show_values=True):
        self.valobj = valobj
        self.show_values = show_values

        table = self.table()
        table_inner = table["table"]
        capacity = int(table_inner["bucket_mask"]) + 1
        ctrl = table_inner["ctrl"]["pointer"]

        self.size = int(table_inner["items"])
        self.pair_type = table.type.template_argument(0).strip_typedefs()

        self.new_layout = not table_inner.type.has_key("data")
        if self.new_layout:
            self.data_ptr = ctrl.cast(self.pair_type.pointer())
        else:
            self.data_ptr = table_inner["data"]["pointer"]

        self.valid_indices = []
        for idx in range(capacity):
            address = ctrl + idx
            value = address.dereference()
            is_presented = value & 128 == 0
            if is_presented:
                self.valid_indices.append(idx)

    def table(self):
        if self.show_values:
            hashbrown_hashmap = self.valobj["base"]
        elif self.valobj.type.fields()[0].name == "map":
            # BACKCOMPAT: rust 1.47
            # HashSet wraps std::collections::HashMap, which wraps hashbrown::HashMap
            hashbrown_hashmap = self.valobj["map"]["base"]
        else:
            # HashSet wraps hashbrown::HashSet, which wraps hashbrown::HashMap
            hashbrown_hashmap = self.valobj["base"]["map"]
        return hashbrown_hashmap["table"]

    def to_string(self):
        if self.show_values:
            return "HashMap(size={})".format(self.size)
        else:
            return "HashSet(size={})".format(self.size)

    def children(self):
        pairs_start = self.data_ptr

        for index in range(self.size):
            idx = self.valid_indices[index]
            if self.new_layout:
                idx = -(idx + 1)
            element = (pairs_start + idx).dereference()
            if self.show_values:
                yield "key{}".format(index), element[ZERO_FIELD]
                yield "val{}".format(index), element[FIRST_FIELD]
            else:
                yield "[{}]".format(index), element[ZERO_FIELD]

    def display_hint(self):
        return "map" if self.show_values else "array"