summaryrefslogtreecommitdiff
path: root/misc/lldb_cruby.py
blob: 9ef9d3967b6e863bd3ccfcaf66cace4da8880432 (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
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
#!/usr/bin/env python
#coding: utf-8
#
# Usage: run `command script import -r misc/lldb_cruby.py` on LLDB
#
# Test: misc/test_lldb_cruby.rb
#

from __future__ import print_function
import lldb
import os
import inspect
import sys
import shlex
import platform
import glob

from lldb_rb.constants import *

# BEGIN FUNCTION STYLE DECLS
# This will be refactored to use class style decls in the misc/commands dir
class BackTrace:
    VM_FRAME_MAGIC_METHOD = 0x11110001
    VM_FRAME_MAGIC_BLOCK = 0x22220001
    VM_FRAME_MAGIC_CLASS = 0x33330001
    VM_FRAME_MAGIC_TOP = 0x44440001
    VM_FRAME_MAGIC_CFUNC = 0x55550001
    VM_FRAME_MAGIC_IFUNC = 0x66660001
    VM_FRAME_MAGIC_EVAL = 0x77770001
    VM_FRAME_MAGIC_RESCUE = 0x78880001
    VM_FRAME_MAGIC_DUMMY = 0x79990001

    VM_FRAME_MAGIC_MASK = 0x7fff0001

    VM_FRAME_MAGIC_NAME = {
            VM_FRAME_MAGIC_TOP: "TOP",
            VM_FRAME_MAGIC_METHOD: "METHOD",
            VM_FRAME_MAGIC_CLASS: "CLASS",
            VM_FRAME_MAGIC_BLOCK: "BLOCK",
            VM_FRAME_MAGIC_CFUNC: "CFUNC",
            VM_FRAME_MAGIC_IFUNC: "IFUNC",
            VM_FRAME_MAGIC_EVAL: "EVAL",
            VM_FRAME_MAGIC_RESCUE: "RESCUE",
            0: "-----"
    }

    def __init__(self, debugger, command, result, internal_dict):
        self.debugger = debugger
        self.command = command
        self.result = result

        self.target = debugger.GetSelectedTarget()
        self.process = self.target.GetProcess()
        self.thread = self.process.GetSelectedThread()
        self.frame = self.thread.GetSelectedFrame()
        self.tRString = self.target.FindFirstType("struct RString").GetPointerType()
        self.tRArray = self.target.FindFirstType("struct RArray").GetPointerType()

        rb_cft_len = len("rb_control_frame_t")
        method_type_length = sorted(map(len, self.VM_FRAME_MAGIC_NAME.values()), reverse=True)[0]
        # cfp address, method type, function name
        self.fmt = "%%-%ds %%-%ds %%s" % (rb_cft_len, method_type_length)

    def vm_frame_magic(self, cfp):
        ep = cfp.GetValueForExpressionPath("->ep")
        frame_type = ep.GetChildAtIndex(0).GetValueAsUnsigned() & self.VM_FRAME_MAGIC_MASK
        return self.VM_FRAME_MAGIC_NAME.get(frame_type, "(none)")

    def rb_iseq_path_str(self, iseq):
        tRBasic = self.target.FindFirstType("struct RBasic").GetPointerType()

        pathobj = iseq.GetValueForExpressionPath("->body->location.pathobj")
        pathobj = pathobj.Cast(tRBasic)
        flags = pathobj.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
        flType = flags & RUBY_T_MASK

        if flType == RUBY_T_ARRAY:
            pathobj = pathobj.Cast(self.tRArray)

            if flags & RUBY_FL_USER1:
                len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6|RUBY_FL_USER7|RUBY_FL_USER8|RUBY_FL_USER9)) >> (RUBY_FL_USHIFT+3))
                ptr = pathobj.GetValueForExpressionPath("->as.ary")
            else:
                len = pathobj.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
                ptr = pathobj.GetValueForExpressionPath("->as.heap.ptr")

            pathobj = ptr.GetChildAtIndex(0)

        pathobj = pathobj.Cast(self.tRString)
        ptr, len = string2cstr(pathobj)
        err = lldb.SBError()
        path = self.target.process.ReadMemory(ptr, len, err)
        if err.Success():
            return path.decode("utf-8")
        else:
            return "unknown"

    def dump_iseq_frame(self, cfp, iseq):
        m = self.vm_frame_magic(cfp)

        if iseq.GetValueAsUnsigned():
            iseq_label = iseq.GetValueForExpressionPath("->body->location.label")
            path = self.rb_iseq_path_str(iseq)
            ptr, len = string2cstr(iseq_label.Cast(self.tRString))

            err = lldb.SBError()
            iseq_name = self.target.process.ReadMemory(ptr, len, err)
            if err.Success():
                iseq_name = iseq_name.decode("utf-8")
            else:
                iseq_name = "error!!"

        else:
            print("No iseq", file=self.result)

        print(self.fmt % (("%0#12x" % cfp.GetAddress().GetLoadAddress(self.target)), m, "%s %s" % (path, iseq_name)), file=self.result)

    def dump_cfunc_frame(self, cfp):
        print(self.fmt % ("%0#12x" % (cfp.GetAddress().GetLoadAddress(self.target)), "CFUNC", ""), file=self.result)

    def print_bt(self, ec):
        tRbExecutionContext_t = self.target.FindFirstType("rb_execution_context_t")
        ec = ec.Cast(tRbExecutionContext_t.GetPointerType())
        vm_stack = ec.GetValueForExpressionPath("->vm_stack")
        vm_stack_size = ec.GetValueForExpressionPath("->vm_stack_size")

        last_cfp_frame = ec.GetValueForExpressionPath("->cfp")
        cfp_type_p = last_cfp_frame.GetType()

        stack_top = vm_stack.GetValueAsUnsigned() + (
                vm_stack_size.GetValueAsUnsigned() * vm_stack.GetType().GetByteSize())

        cfp_frame_size = cfp_type_p.GetPointeeType().GetByteSize()

        start_cfp = stack_top
        # Skip dummy frames
        start_cfp -= cfp_frame_size
        start_cfp -= cfp_frame_size

        last_cfp = last_cfp_frame.GetValueAsUnsigned()

        size = ((start_cfp - last_cfp) / cfp_frame_size) + 1

        print(self.fmt % ("rb_control_frame_t", "TYPE", ""), file=self.result)

        curr_addr = start_cfp

        while curr_addr >= last_cfp:
            cfp = self.target.CreateValueFromAddress("cfp", lldb.SBAddress(curr_addr, self.target), cfp_type_p.GetPointeeType())
            ep = cfp.GetValueForExpressionPath("->ep")
            iseq = cfp.GetValueForExpressionPath("->iseq")

            frame_type = ep.GetChildAtIndex(0).GetValueAsUnsigned() & self.VM_FRAME_MAGIC_MASK

            if iseq.GetValueAsUnsigned():
                pc = cfp.GetValueForExpressionPath("->pc")
                if pc.GetValueAsUnsigned():
                    self.dump_iseq_frame(cfp, iseq)
            else:
                if frame_type == self.VM_FRAME_MAGIC_CFUNC:
                    self.dump_cfunc_frame(cfp)

            curr_addr -= cfp_frame_size

def lldb_init(debugger):
    target = debugger.GetSelectedTarget()
    global SIZEOF_VALUE
    SIZEOF_VALUE = target.FindFirstType("VALUE").GetByteSize()

    value_types = []
    g = globals()

    imemo_types = target.FindFirstType('enum imemo_type')
    enum_members = imemo_types.GetEnumMembers()

    for i in range(enum_members.GetSize()):
        member = enum_members.GetTypeEnumMemberAtIndex(i)
        g[member.GetName()] = member.GetValueAsUnsigned()

    for enum in target.FindFirstGlobalVariable('ruby_dummy_gdb_enums'):
        enum = enum.GetType()
        members = enum.GetEnumMembers()
        for i in range(0, members.GetSize()):
            member = members.GetTypeEnumMemberAtIndex(i)
            name = member.GetName()
            value = member.GetValueAsUnsigned()
            g[name] = value

            if name.startswith('RUBY_T_'):
                value_types.append(name)
    g['value_types'] = value_types

def string2cstr(rstring):
    """Returns the pointer to the C-string in the given String object"""
    if rstring.TypeIsPointerType():
        rstring = rstring.Dereference()
    flags = rstring.GetValueForExpressionPath(".basic->flags").unsigned
    if flags & RUBY_T_MASK != RUBY_T_STRING:
        raise TypeError("not a string")
    if flags & RUBY_FL_USER1:
        cptr = int(rstring.GetValueForExpressionPath(".as.heap.ptr").value, 0)
        clen = int(rstring.GetValueForExpressionPath(".as.heap.len").value, 0)
    else:
        cptr = int(rstring.GetValueForExpressionPath(".as.embed.ary").location, 0)
        clen = int(rstring.GetValueForExpressionPath(".as.embed.len").value, 0)
    return cptr, clen

def output_string(debugger, result, rstring):
    cptr, clen = string2cstr(rstring)
    expr = "print *(const char (*)[%d])%0#x" % (clen, cptr)
    append_command_output(debugger, expr, result)

def fixnum_p(x):
    return x & RUBY_FIXNUM_FLAG != 0

def flonum_p(x):
    return (x&RUBY_FLONUM_MASK) == RUBY_FLONUM_FLAG

def static_sym_p(x):
    return (x&~(~0<<RUBY_SPECIAL_SHIFT)) == RUBY_SYMBOL_FLAG

def append_command_output(debugger, command, result):
    output1 = result.GetOutput()
    debugger.GetCommandInterpreter().HandleCommand(command, result)
    output2 = result.GetOutput()
    result.Clear()
    result.write(output1)
    result.write(output2)

def lldb_rp(debugger, command, result, internal_dict):
    if not ('RUBY_Qfalse' in globals()):
        lldb_init(debugger)

    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    frame = thread.GetSelectedFrame()
    if frame.IsValid():
        val = frame.EvaluateExpression(command)
    else:
        val = target.EvaluateExpression(command)
    error = val.GetError()
    if error.Fail():
        print(error, file=result)
        return
    lldb_inspect(debugger, target, result, val)

def lldb_inspect(debugger, target, result, val):
    num = val.GetValueAsSigned()
    if num == RUBY_Qfalse:
        print('false', file=result)
    elif num == RUBY_Qtrue:
        print('true', file=result)
    elif num == RUBY_Qnil:
        print('nil', file=result)
    elif num == RUBY_Qundef:
        print('undef', file=result)
    elif fixnum_p(num):
        print(num >> 1, file=result)
    elif flonum_p(num):
        append_command_output(debugger, "print rb_float_value(%0#x)" % val.GetValueAsUnsigned(), result)
    elif static_sym_p(num):
        if num < 128:
            print("T_SYMBOL: %c" % num, file=result)
        else:
            print("T_SYMBOL: (%x)" % num, file=result)
            append_command_output(debugger, "p rb_id2name(%0#x)" % (num >> 8), result)
    elif num & RUBY_IMMEDIATE_MASK:
        print('immediate(%x)' % num, file=result)
    else:
        tRBasic = target.FindFirstType("struct RBasic").GetPointerType()
        tRValue = target.FindFirstType("struct RVALUE")

        val = val.Cast(tRBasic)
        flags = val.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
        flaginfo = ""

        page = get_page(lldb, target, val)
        page_type = target.FindFirstType("struct heap_page").GetPointerType()
        page.Cast(page_type)

        dump_bits(target, result, page, val.GetValueAsUnsigned())

        if (flags & RUBY_FL_PROMOTED) == RUBY_FL_PROMOTED:
            flaginfo += "[PROMOTED] "
        if (flags & RUBY_FL_FREEZE) == RUBY_FL_FREEZE:
            flaginfo += "[FROZEN] "
        flType = flags & RUBY_T_MASK
        if flType == RUBY_T_NONE:
            print('T_NONE: %s%s' % (flaginfo, val.Dereference()), file=result)
        elif flType == RUBY_T_NIL:
            print('T_NIL: %s%s' % (flaginfo, val.Dereference()), file=result)
        elif flType == RUBY_T_OBJECT:
            result.write('T_OBJECT: %s' % flaginfo)
            append_command_output(debugger, "print *(struct RObject*)%0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_CLASS or flType == RUBY_T_MODULE or flType == RUBY_T_ICLASS:
            result.write('T_%s: %s' % ('CLASS' if flType == RUBY_T_CLASS else 'MODULE' if flType == RUBY_T_MODULE else 'ICLASS', flaginfo))
            append_command_output(debugger, "print *(struct RClass*)%0#x" % val.GetValueAsUnsigned(), result)
            tRClass = target.FindFirstType("struct RClass")
            if not val.Cast(tRClass).GetChildMemberWithName("ptr").IsValid():
                append_command_output(debugger, "print *(struct rb_classext_struct*)%0#x" % (val.GetValueAsUnsigned() + tRClass.GetByteSize()), result)
        elif flType == RUBY_T_STRING:
            result.write('T_STRING: %s' % flaginfo)
            encidx = ((flags & RUBY_ENCODING_MASK)>>RUBY_ENCODING_SHIFT)
            encname = target.FindFirstType("enum ruby_preserved_encindex").GetEnumMembers().GetTypeEnumMemberAtIndex(encidx).GetName()
            if encname is not None:
                result.write('[%s] ' % encname[14:])
            else:
                result.write('[enc=%d] ' % encidx)
            tRString = target.FindFirstType("struct RString").GetPointerType()
            ptr, len = string2cstr(val.Cast(tRString))
            if len == 0:
                result.write("(empty)\n")
            else:
                append_command_output(debugger, "print *(const char (*)[%d])%0#x" % (len, ptr), result)
        elif flType == RUBY_T_SYMBOL:
            result.write('T_SYMBOL: %s' % flaginfo)
            tRSymbol = target.FindFirstType("struct RSymbol").GetPointerType()
            val = val.Cast(tRSymbol)
            append_command_output(debugger, 'print (ID)%0#x ' % val.GetValueForExpressionPath("->id").GetValueAsUnsigned(), result)
            tRString = target.FindFirstType("struct RString").GetPointerType()
            output_string(debugger, result, val.GetValueForExpressionPath("->fstr").Cast(tRString))
        elif flType == RUBY_T_ARRAY:
            tRArray = target.FindFirstType("struct RArray").GetPointerType()
            val = val.Cast(tRArray)
            if flags & RUBY_FL_USER1:
                len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6|RUBY_FL_USER7|RUBY_FL_USER8|RUBY_FL_USER9)) >> (RUBY_FL_USHIFT+3))
                ptr = val.GetValueForExpressionPath("->as.ary")
            else:
                len = val.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
                ptr = val.GetValueForExpressionPath("->as.heap.ptr")
            result.write("T_ARRAY: %slen=%d" % (flaginfo, len))
            if flags & RUBY_FL_USER1:
                result.write(" (embed)")
            elif flags & RUBY_FL_USER2:
                shared = val.GetValueForExpressionPath("->as.heap.aux.shared").GetValueAsUnsigned()
                result.write(" (shared) shared=%016x" % shared)
            else:
                capa = val.GetValueForExpressionPath("->as.heap.aux.capa").GetValueAsSigned()
                result.write(" (ownership) capa=%d" % capa)
            if len == 0:
                result.write(" {(empty)}\n")
            else:
                result.write("\n")
                if ptr.GetValueAsSigned() == 0:
                    append_command_output(debugger, "expression -fx -- ((struct RArray*)%0#x)->as.ary" % val.GetValueAsUnsigned(), result)
                else:
                    append_command_output(debugger, "expression -Z %d -fx -- (const VALUE*)%0#x" % (len, ptr.GetValueAsUnsigned()), result)
        elif flType == RUBY_T_HASH:
            result.write("T_HASH: %s" % flaginfo)
            append_command_output(debugger, "p *(struct RHash *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_BIGNUM:
            tRBignum = target.FindFirstType("struct RBignum").GetPointerType()
            val = val.Cast(tRBignum)
            sign = '+' if (flags & RUBY_FL_USER1) != 0 else '-'
            if flags & RUBY_FL_USER2:
                len = ((flags & (RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5)) >> (RUBY_FL_USHIFT+3))
                print("T_BIGNUM: sign=%s len=%d (embed)" % (sign, len), file=result)
                append_command_output(debugger, "print ((struct RBignum *) %0#x)->as.ary" % val.GetValueAsUnsigned(), result)
            else:
                len = val.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
                print("T_BIGNUM: sign=%s len=%d" % (sign, len), file=result)
                print(val.Dereference(), file=result)
                append_command_output(debugger, "expression -Z %x -fx -- (const BDIGIT*)((struct RBignum*)%d)->as.heap.digits" % (len, val.GetValueAsUnsigned()), result)
                # append_command_output(debugger, "x ((struct RBignum *) %0#x)->as.heap.digits / %d" % (val.GetValueAsUnsigned(), len), result)
        elif flType == RUBY_T_FLOAT:
            append_command_output(debugger, "print ((struct RFloat *)%d)->float_value" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_RATIONAL:
            tRRational = target.FindFirstType("struct RRational").GetPointerType()
            val = val.Cast(tRRational)
            lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->num"))
            output = result.GetOutput()
            result.Clear()
            result.write("(Rational) " + output.rstrip() + " / ")
            lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->den"))
        elif flType == RUBY_T_COMPLEX:
            tRComplex = target.FindFirstType("struct RComplex").GetPointerType()
            val = val.Cast(tRComplex)
            lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->real"))
            real = result.GetOutput().rstrip()
            result.Clear()
            lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->imag"))
            imag = result.GetOutput().rstrip()
            result.Clear()
            if not imag.startswith("-"):
                imag = "+" + imag
            print("(Complex) " + real + imag + "i", file=result)
        elif flType == RUBY_T_REGEXP:
            tRRegex = target.FindFirstType("struct RRegexp").GetPointerType()
            val = val.Cast(tRRegex)
            print("(Regex) ->src {", file=result)
            lldb_inspect(debugger, target, result, val.GetValueForExpressionPath("->src"))
            print("}", file=result)
        elif flType == RUBY_T_DATA:
            tRTypedData = target.FindFirstType("struct RTypedData").GetPointerType()
            val = val.Cast(tRTypedData)
            flag = val.GetValueForExpressionPath("->typed_flag")
            if flag.GetValueAsUnsigned() == 1:
                print("T_DATA: %s" % val.GetValueForExpressionPath("->type->wrap_struct_name"), file=result)
                append_command_output(debugger, "p *(struct RTypedData *) %0#x" % val.GetValueAsUnsigned(), result)
            else:
                print("T_DATA:", file=result)
                append_command_output(debugger, "p *(struct RData *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_NODE:
            tRTypedData = target.FindFirstType("struct RNode").GetPointerType()
            nd_type = (flags & RUBY_NODE_TYPEMASK) >> RUBY_NODE_TYPESHIFT
            append_command_output(debugger, "p (node_type) %d" % nd_type, result)
            val = val.Cast(tRTypedData)
            append_command_output(debugger, "p *(struct RNode *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_MOVED:
            tRTypedData = target.FindFirstType("struct RMoved").GetPointerType()
            val = val.Cast(tRTypedData)
            append_command_output(debugger, "p *(struct RMoved *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_MATCH:
            tRTypedData = target.FindFirstType("struct RMatch").GetPointerType()
            val = val.Cast(tRTypedData)
            append_command_output(debugger, "p *(struct RMatch *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_IMEMO:
            # I'm not sure how to get IMEMO_MASK out of lldb. It's not in globals()
            imemo_type = (flags >> RUBY_FL_USHIFT) & 0x0F # IMEMO_MASK

            print("T_IMEMO: ", file=result)
            append_command_output(debugger, "p (enum imemo_type) %d" % imemo_type, result)
            append_command_output(debugger, "p *(struct MEMO *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_STRUCT:
            tRTypedData = target.FindFirstType("struct RStruct").GetPointerType()
            val = val.Cast(tRTypedData)
            append_command_output(debugger, "p *(struct RStruct *) %0#x" % val.GetValueAsUnsigned(), result)
        elif flType == RUBY_T_ZOMBIE:
            tRZombie = target.FindFirstType("struct RZombie").GetPointerType()
            val = val.Cast(tRZombie)
            append_command_output(debugger, "p *(struct RZombie *) %0#x" % val.GetValueAsUnsigned(), result)
        else:
            print("Not-handled type %0#x" % flType, file=result)
            print(val, file=result)

def count_objects(debugger, command, ctx, result, internal_dict):
    objspace = ctx.frame.EvaluateExpression("ruby_current_vm->objspace")
    num_pages = objspace.GetValueForExpressionPath(".heap_pages.allocated_pages").unsigned

    counts = {}
    total = 0
    for t in range(0x00, RUBY_T_MASK+1):
        counts[t] = 0

    for i in range(0, num_pages):
        print("\rcounting... %d/%d" % (i, num_pages), end="")
        page = objspace.GetValueForExpressionPath('.heap_pages.sorted[%d]' % i)
        p = page.GetChildMemberWithName('start')
        num_slots = page.GetChildMemberWithName('total_slots').unsigned
        for j in range(0, num_slots):
            obj = p.GetValueForExpressionPath('[%d]' % j)
            flags = obj.GetValueForExpressionPath('.as.basic.flags').unsigned
            obj_type = flags & RUBY_T_MASK
            counts[obj_type] += 1
        total += num_slots

    print("\rTOTAL: %d, FREE: %d" % (total, counts[0x00]))
    for sym in value_types:
        print("%s: %d" % (sym, counts[globals()[sym]]))

def stack_dump_raw(debugger, command, ctx, result, internal_dict):
    ctx.frame.EvaluateExpression("rb_vmdebug_stack_dump_raw_current()")

def check_bits(page, bitmap_name, bitmap_index, bitmap_bit, v):
    bits = page.GetChildMemberWithName(bitmap_name)
    plane = bits.GetChildAtIndex(bitmap_index).GetValueAsUnsigned()
    if (plane & bitmap_bit) != 0:
        return v
    else:
        return ' '

def heap_page_body(debugger, command, ctx, result, internal_dict):
    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    frame = thread.GetSelectedFrame()

    val = frame.EvaluateExpression(command)
    page = get_page_body(lldb, target, val)
    print("Page body address: ", page.GetAddress(), file=result)
    print(page, file=result)

def get_page_body(lldb, target, val):
    tHeapPageBody = target.FindFirstType("struct heap_page_body")
    addr = val.GetValueAsUnsigned()
    page_addr = addr & ~(HEAP_PAGE_ALIGN_MASK)
    address = lldb.SBAddress(page_addr, target)
    return target.CreateValueFromAddress("page", address, tHeapPageBody)

def get_page(lldb, target, val):
    body = get_page_body(lldb, target, val)
    return body.GetValueForExpressionPath("->header.page")

def dump_node(debugger, command, ctx, result, internal_dict):
    args = shlex.split(command)
    if not args:
        return
    node = args[0]

    dump = ctx.frame.EvaluateExpression("(struct RString*)rb_parser_dump_tree((NODE*)(%s), 0)" % node)
    output_string(ctx, result, dump)

def rb_backtrace(debugger, command, result, internal_dict):
    if not ('RUBY_Qfalse' in globals()):
        lldb_init(debugger)
    bt = BackTrace(debugger, command, result, internal_dict)
    frame = bt.frame

    if command:
        if frame.IsValid():
            val = frame.EvaluateExpression(command)
        else:
            val = target.EvaluateExpression(command)

        error = val.GetError()
        if error.Fail():
            print >> result, error
            return
    else:
        print("Need an EC for now")

    bt.print_bt(val)

def dump_bits(target, result, page, object_address, end = "\n"):
    tRValue = target.FindFirstType("struct RVALUE")
    tUintPtr = target.FindFirstType("uintptr_t") # bits_t

    num_in_page = (object_address & HEAP_PAGE_ALIGN_MASK) // tRValue.GetByteSize();
    bits_bitlength = tUintPtr.GetByteSize() * 8
    bitmap_index = num_in_page // bits_bitlength
    bitmap_offset = num_in_page & (bits_bitlength - 1)
    bitmap_bit = 1 << bitmap_offset

    print("bits: [%s%s%s%s%s]" % (
        check_bits(page, "uncollectible_bits", bitmap_index, bitmap_bit, "L"),
        check_bits(page, "mark_bits", bitmap_index, bitmap_bit, "M"),
        check_bits(page, "pinned_bits", bitmap_index, bitmap_bit, "P"),
        check_bits(page, "marking_bits", bitmap_index, bitmap_bit, "R"),
        check_bits(page, "wb_unprotected_bits", bitmap_index, bitmap_bit, "U"),
        ), end=end, file=result)

class HeapPageIter:
    def __init__(self, page, target):
        self.page = page
        self.target = target
        self.start = page.GetChildMemberWithName('start').GetValueAsUnsigned();
        self.num_slots = page.GetChildMemberWithName('total_slots').unsigned
        self.slot_size = page.GetChildMemberWithName('size_pool').GetChildMemberWithName('slot_size').unsigned
        self.counter = 0
        self.tRBasic = target.FindFirstType("struct RBasic")
        self.tRValue = target.FindFirstType("struct RVALUE")

    def is_valid(self):
        heap_page_header_size = self.target.FindFirstType("struct heap_page_header").GetByteSize()
        rvalue_size = self.slot_size
        heap_page_obj_limit = int((HEAP_PAGE_SIZE - heap_page_header_size) / self.slot_size)

        return (heap_page_obj_limit - 1) <= self.num_slots <= heap_page_obj_limit

    def __iter__(self):
        return self

    def __next__(self):
        if self.counter < self.num_slots:
            obj_addr_i = self.start + (self.counter * self.slot_size)
            obj_addr = lldb.SBAddress(obj_addr_i, self.target)
            slot_info = (self.counter, obj_addr_i, self.target.CreateValueFromAddress("object", obj_addr, self.tRBasic))
            self.counter += 1

            return slot_info
        else:
            raise StopIteration


def dump_page_internal(page, target, process, thread, frame, result, debugger, highlight=None):
    if not ('RUBY_Qfalse' in globals()):
        lldb_init(debugger)

    ruby_type_map = ruby_types(debugger)

    freelist = []
    fl_start = page.GetChildMemberWithName('freelist').GetValueAsUnsigned()
    tRVALUE = target.FindFirstType("struct RVALUE")

    while fl_start > 0:
        freelist.append(fl_start)
        obj_addr = lldb.SBAddress(fl_start, target)
        obj = target.CreateValueFromAddress("object", obj_addr, tRVALUE)
        fl_start = obj.GetChildMemberWithName("as").GetChildMemberWithName("free").GetChildMemberWithName("next").GetValueAsUnsigned()


    page_iter = HeapPageIter(page, target)
    if page_iter.is_valid():
        for (page_index, obj_addr, obj) in page_iter:
            dump_bits(target, result, page, obj_addr, end= " ")
            flags = obj.GetChildMemberWithName('flags').GetValueAsUnsigned()
            flType = flags & RUBY_T_MASK

            flidx = '   '
            if flType == RUBY_T_NONE:
                try:
                    flidx = "%3d" % freelist.index(obj_addr)
                except ValueError:
                    flidx = ' -1'

            if flType == RUBY_T_NONE:
                klass = obj.GetChildMemberWithName('klass').GetValueAsUnsigned()
                result_str = "%s idx: [%3d] freelist_idx: {%s} Addr: %0#x (flags: %0#x, next: %0#x)" % (rb_type(flags, ruby_type_map), page_index, flidx, obj_addr, flags, klass)
            else:
                result_str = "%s idx: [%3d] freelist_idx: {%s} Addr: %0#x (flags: %0#x)" % (rb_type(flags, ruby_type_map), page_index, flidx, obj_addr, flags)

            if highlight == obj_addr:
                result_str = ' '.join([result_str, "<<<<<"])

            print(result_str, file=result)
    else:
        print("%s is not a valid heap page" % page, file=result)



def dump_page(debugger, command, result, internal_dict):
    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    frame = thread.GetSelectedFrame()

    tHeapPageP = target.FindFirstType("struct heap_page").GetPointerType()
    page = frame.EvaluateExpression(command)
    page = page.Cast(tHeapPageP)

    dump_page_internal(page, target, process, thread, frame, result, debugger)


def dump_page_rvalue(debugger, command, result, internal_dict):
    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    frame = thread.GetSelectedFrame()

    val = frame.EvaluateExpression(command)
    page = get_page(lldb, target, val)
    page_type = target.FindFirstType("struct heap_page").GetPointerType()
    page.Cast(page_type)

    dump_page_internal(page, target, process, thread, frame, result, debugger, highlight=val.GetValueAsUnsigned())



def rb_type(flags, ruby_types):
    flType = flags & RUBY_T_MASK
    return "%-10s" % (ruby_types.get(flType, ("%0#x" % flType)))

def ruby_types(debugger):
    target = debugger.GetSelectedTarget()

    types = {}
    for enum in target.FindFirstGlobalVariable('ruby_dummy_gdb_enums'):
        enum = enum.GetType()
        members = enum.GetEnumMembers()
        for i in range(0, members.GetSize()):
            member = members.GetTypeEnumMemberAtIndex(i)
            name = member.GetName()
            value = member.GetValueAsUnsigned()

            if name.startswith('RUBY_T_'):
                types[value] = name.replace('RUBY_', '')

    return types

def rb_ary_entry(target, ary, idx, result):
    tRArray = target.FindFirstType("struct RArray").GetPointerType()
    ary = ary.Cast(tRArray)
    flags = ary.GetValueForExpressionPath("->flags").GetValueAsUnsigned()

    if flags & RUBY_FL_USER1:
        ptr = ary.GetValueForExpressionPath("->as.ary")
    else:
        ptr = ary.GetValueForExpressionPath("->as.heap.ptr")

    ptr_addr = ptr.GetValueAsUnsigned() + (idx * ptr.GetType().GetByteSize())
    return target.CreateValueFromAddress("ary_entry[%d]" % idx, lldb.SBAddress(ptr_addr, target), ptr.GetType().GetPointeeType())

def rb_id_to_serial(id_val):
    if id_val > tLAST_OP_ID:
        return id_val >> RUBY_ID_SCOPE_SHIFT
    else:
        return id_val

def rb_id2str(debugger, command, result, internal_dict):
    if not ('RUBY_Qfalse' in globals()):
        lldb_init(debugger)

    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    frame = thread.GetSelectedFrame()
    global_symbols = target.FindFirstGlobalVariable("ruby_global_symbols")

    id_val = frame.EvaluateExpression(command).GetValueAsUnsigned()
    num = rb_id_to_serial(id_val)

    last_id = global_symbols.GetChildMemberWithName("last_id").GetValueAsUnsigned()
    ID_ENTRY_SIZE = 2
    ID_ENTRY_UNIT = int(target.FindFirstGlobalVariable("ID_ENTRY_UNIT").GetValue())

    ids = global_symbols.GetChildMemberWithName("ids")

    if (num <= last_id):
        idx = num // ID_ENTRY_UNIT
        ary = rb_ary_entry(target, ids, idx, result)
        pos = (num % ID_ENTRY_UNIT) * ID_ENTRY_SIZE
        id_str = rb_ary_entry(target, ary, pos, result)
        lldb_inspect(debugger, target, result, id_str)
# END FUNCTION STYLE DECLS


load_dir, _ = os.path.split(os.path.realpath(__file__))

for fname in glob.glob(f"{load_dir}/lldb_rb/commands/*_command.py"):
    _, basename = os.path.split(fname)
    mname, _ = os.path.splitext(basename)

    exec(f"import lldb_rb.commands.{mname}")

def __lldb_init_module(debugger, internal_dict):
    # Register all classes that subclass RbBaseCommand

    for memname, mem in inspect.getmembers(sys.modules["lldb_rb.rb_base_command"]):
        if inspect.isclass(mem):
            for sclass in mem.__subclasses__():
                sclass.register_lldb_command(debugger, f"{__name__}.{sclass.__module__}")


    ## FUNCTION INITS - These should be removed when converted to class commands
    debugger.HandleCommand("command script add -f lldb_cruby.lldb_rp rp")
    debugger.HandleCommand("command script add -f lldb_cruby.count_objects rb_count_objects")
    debugger.HandleCommand("command script add -f lldb_cruby.stack_dump_raw SDR")
    debugger.HandleCommand("command script add -f lldb_cruby.dump_node dump_node")
    debugger.HandleCommand("command script add -f lldb_cruby.heap_page_body heap_page_body")
    debugger.HandleCommand("command script add -f lldb_cruby.rb_backtrace rbbt")
    debugger.HandleCommand("command script add -f lldb_cruby.dump_page dump_page")
    debugger.HandleCommand("command script add -f lldb_cruby.dump_page_rvalue dump_page_rvalue")
    debugger.HandleCommand("command script add -f lldb_cruby.rb_id2str rb_id2str")

    lldb_rb.rb_base_command.RbBaseCommand.lldb_init(debugger)

    print("lldb scripts for ruby has been installed.")