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ruby/misc/lldb_cruby.py

535 строки
24 KiB
Python
Executable File
Исходник Ответственный История

#!/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 shlex
HEAP_PAGE_ALIGN_LOG = 14
HEAP_PAGE_ALIGN_MASK = (~(~0 << HEAP_PAGE_ALIGN_LOG))
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_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()
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.ary").location, 0)
clen = (flags & RSTRING_EMBED_LEN_MASK) >> RSTRING_EMBED_LEN_SHIFT
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")
tUintPtr = target.FindFirstType("uintptr_t") # bits_t
val = val.Cast(tRBasic)
flags = val.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
flaginfo = ""
num_in_page = (val.GetValueAsUnsigned() & 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
page = get_page(lldb, target, val)
page_type = target.FindFirstType("struct heap_page").GetPointerType()
page.Cast(page_type)
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"),
), file=result)
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)
elif flType == RUBY_T_STRING:
result.write('T_STRING: %s' % flaginfo)
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_USHIFT+3))
ptr = val.GetValueForExpressionPath("->as.ary")
else:
len = val.GetValueForExpressionPath("->as.heap.len").GetValueAsSigned()
ptr = val.GetValueForExpressionPath("->as.heap.ptr")
#print(val.GetValueForExpressionPath("->as.heap"), file=result)
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:
tRFloat = target.FindFirstType("struct RFloat").GetPointerType()
val = val.Cast(tRFloat)
append_command_output(debugger, "p *(double *)%0#x" % val.GetValueForExpressionPath("->float_value").GetAddress(), 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_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(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(lldb, target, val)
page_type = target.FindFirstType("struct heap_page").GetPointerType()
page.Cast(page_type)
append_command_output(debugger, "p (struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
append_command_output(debugger, "p *(struct heap_page *) %0#x" % page.GetValueAsUnsigned(), result)
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):
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 __lldb_init_module(debugger, internal_dict):
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 heap_page")
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")
lldb_init(debugger)
print("lldb scripts for ruby has been installed.")
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