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from lldb_rb.lldb_interface import LLDBInterface
from lldb_rb.rb_heap_structs import HeapPage, RbObject
from lldb_rb.constants import *
class RbInspector(LLDBInterface):
def __init__(self, debugger, result, ruby_globals):
self.build_environment(debugger)
self.result = result
self.ruby_globals = ruby_globals
def _append_command_output(self, command):
output1 = self.result.GetOutput()
self.debugger.GetCommandInterpreter().HandleCommand(command, self.result)
output2 = self.result.GetOutput()
self.result.Clear()
self.result.write(output1)
self.result.write(output2)
def string2cstr(self, 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
clen = int(rstring.GetValueForExpressionPath(".len").value, 0)
if flags & self.ruby_globals["RUBY_FL_USER1"]:
cptr = int(rstring.GetValueForExpressionPath(".as.heap.ptr").value, 0)
else:
cptr = int(rstring.GetValueForExpressionPath(".as.embed.ary").location, 0)
return cptr, clen
def output_string(self, rstring):
cptr, clen = self.string2cstr(rstring)
expr = "print *(const char (*)[%d])%0#x" % (clen, cptr)
self._append_command_output(expr)
def fixnum_p(self, x):
return x & self.ruby_globals["RUBY_FIXNUM_FLAG"] != 0
def flonum_p(self, x):
return (x & self.ruby_globals["RUBY_FLONUM_MASK"]) == self.ruby_globals["RUBY_FLONUM_FLAG"]
def static_sym_p(self, x):
special_shift = self.ruby_globals["RUBY_SPECIAL_SHIFT"]
symbol_flag = self.ruby_globals["RUBY_SYMBOL_FLAG"]
return (x & ~(~0 << special_shift)) == symbol_flag
def generic_inspect(self, val, rtype):
tRType = self.target.FindFirstType("struct %s" % rtype).GetPointerType()
val = val.Cast(tRType)
self._append_command_output("p *(struct %s *) %0#x" % (rtype, val.GetValueAsUnsigned()))
def inspect(self, val):
rbTrue = self.ruby_globals["RUBY_Qtrue"]
rbFalse = self.ruby_globals["RUBY_Qfalse"]
rbNil = self.ruby_globals["RUBY_Qnil"]
rbUndef = self.ruby_globals["RUBY_Qundef"]
rbImmediateMask = self.ruby_globals["RUBY_IMMEDIATE_MASK"]
num = val.GetValueAsSigned()
if num == rbFalse:
print('false', file=self.result)
elif num == rbTrue:
print('true', file=self.result)
elif num == rbNil:
print('nil', file=self.result)
elif num == rbUndef:
print('undef', file=self.result)
elif self.fixnum_p(num):
print(num >> 1, file=self.result)
elif self.flonum_p(num):
self._append_command_output("print rb_float_value(%0#x)" % val.GetValueAsUnsigned())
elif self.static_sym_p(num):
if num < 128:
print("T_SYMBOL: %c" % num, file=self.result)
else:
print("T_SYMBOL: (%x)" % num, file=self.result)
self._append_command_output("p rb_id2name(%0#x)" % (num >> 8))
elif num & rbImmediateMask:
print('immediate(%x)' % num, file=self.result)
else:
rval = RbObject(val, self.debugger, self.ruby_globals)
rval.dump_bits(self.result)
flaginfo = ""
if rval.promoted_p():
flaginfo += "[PROMOTED] "
if rval.frozen_p():
flaginfo += "[FROZEN] "
if rval.is_type("RUBY_T_NONE"):
print('T_NONE: %s%s' % (flaginfo, val.Dereference()), file=self.result)
elif rval.is_type("RUBY_T_NIL"):
print('T_NIL: %s%s' % (flaginfo, val.Dereference()), file=self.result)
elif rval.is_type("RUBY_T_OBJECT"):
self.result.write('T_OBJECT: %s' % flaginfo)
self._append_command_output("print *(struct RObject*)%0#x" % val.GetValueAsUnsigned())
elif (rval.is_type("RUBY_T_CLASS") or
rval.is_type("RUBY_T_MODULE") or
rval.is_type("RUBY_T_ICLASS")):
self.result.write('T_%s: %s' % (rval.type_name.split('_')[-1], flaginfo))
tRClass = self.target.FindFirstType("struct RClass")
self._append_command_output("print *(struct RClass*)%0#x" % val.GetValueAsUnsigned())
if not val.Cast(tRClass).GetChildMemberWithName("ptr").IsValid():
self._append_command_output(
"print *(struct rb_classext_struct*)%0#x" %
(val.GetValueAsUnsigned() + tRClass.GetByteSize())
)
elif rval.is_type("RUBY_T_STRING"):
self.result.write('T_STRING: %s' % flaginfo)
tRString = self.target.FindFirstType("struct RString").GetPointerType()
rb_enc_mask = self.ruby_globals["RUBY_ENCODING_MASK"]
rb_enc_shift = self.ruby_globals["RUBY_ENCODING_SHIFT"]
encidx = ((rval.flags & rb_enc_mask) >> rb_enc_shift)
encname = self.target.FindFirstType("enum ruby_preserved_encindex") \
.GetEnumMembers().GetTypeEnumMemberAtIndex(encidx) \
.GetName()
if encname is not None:
self.result.write('[%s] ' % encname[14:])
else:
self.result.write('[enc=%d] ' % encidx)
ptr, len = self.string2cstr(val.Cast(tRString))
if len == 0:
self.result.write("(empty)\n")
else:
self._append_command_output("print *(const char (*)[%d])%0#x" % (len, ptr))
elif rval.is_type("RUBY_T_SYMBOL"):
self.result.write('T_SYMBOL: %s' % flaginfo)
tRSymbol = self.target.FindFirstType("struct RSymbol").GetPointerType()
tRString = self.target.FindFirstType("struct RString").GetPointerType()
val = val.Cast(tRSymbol)
self._append_command_output(
'print (ID)%0#x ' % val.GetValueForExpressionPath("->id").GetValueAsUnsigned())
self.output_string(val.GetValueForExpressionPath("->fstr").Cast(tRString))
elif rval.is_type("RUBY_T_ARRAY"):
len = rval.ary_len()
ptr = rval.ary_ptr()
self.result.write("T_ARRAY: %slen=%d" % (flaginfo, len))
if rval.flags & self.ruby_globals["RUBY_FL_USER1"]:
self.result.write(" (embed)")
elif rval.flags & self.ruby_globals["RUBY_FL_USER2"]:
shared = val.GetValueForExpressionPath("->as.heap.aux.shared").GetValueAsUnsigned()
self.result.write(" (shared) shared=%016x" % shared)
else:
capa = val.GetValueForExpressionPath("->as.heap.aux.capa").GetValueAsSigned()
self.result.write(" (ownership) capa=%d" % capa)
if len == 0:
self.result.write(" {(empty)}\n")
else:
self.result.write("\n")
if ptr.GetValueAsSigned() == 0:
self._append_command_output(
"expression -fx -- ((struct RArray*)%0#x)->as.ary" % val.GetValueAsUnsigned())
else:
self._append_command_output(
"expression -Z %d -fx -- (const VALUE*)%0#x" % (len, ptr.GetValueAsUnsigned()))
elif rval.is_type("RUBY_T_HASH"):
self.result.write("T_HASH: %s" % flaginfo)
self._append_command_output("p *(struct RHash *) %0#x" % val.GetValueAsUnsigned())
elif rval.is_type("RUBY_T_BIGNUM"):
tRBignum = self.target.FindFirstType("struct RBignum").GetPointerType()
sign = '-'
if (rval.flags & self.ruby_globals["RUBY_FL_USER1"]) != 0:
sign = '+'
len = rval.bignum_len()
if rval.flags & self.ruby_globals["RUBY_FL_USER2"]:
print("T_BIGNUM: sign=%s len=%d (embed)" % (sign, len), file=self.result)
self._append_command_output("print ((struct RBignum *) %0#x)->as.ary"
% val.GetValueAsUnsigned())
else:
print("T_BIGNUM: sign=%s len=%d" % (sign, len), file=self.result)
print(val.Dereference(), file=self.result)
self._append_command_output(
"expression -Z %x -fx -- (const BDIGIT*)((struct RBignum*)%d)->as.heap.digits" %
(len, val.GetValueAsUnsigned()))
elif rval.is_type("RUBY_T_FLOAT"):
self._append_command_output("print ((struct RFloat *)%d)->float_value"
% val.GetValueAsUnsigned())
elif rval.is_type("RUBY_T_RATIONAL"):
tRRational = self.target.FindFirstType("struct RRational").GetPointerType()
val = val.Cast(tRRational)
self.inspect(val.GetValueForExpressionPath("->num"))
output = self.result.GetOutput()
self.result.Clear()
self.result.write("(Rational) " + output.rstrip() + " / ")
self.inspect(val.GetValueForExpressionPath("->den"))
elif rval.is_type("RUBY_T_COMPLEX"):
tRComplex = self.target.FindFirstType("struct RComplex").GetPointerType()
val = val.Cast(tRComplex)
self.inspect(val.GetValueForExpressionPath("->real"))
real = self.result.GetOutput().rstrip()
self.result.Clear()
self.inspect(val.GetValueForExpressionPath("->imag"))
imag = self.result.GetOutput().rstrip()
self.result.Clear()
if not imag.startswith("-"):
imag = "+" + imag
print("(Complex) " + real + imag + "i", file=self.result)
elif rval.is_type("RUBY_T_REGEXP"):
tRRegex = self.target.FindFirstType("struct RRegexp").GetPointerType()
val = val.Cast(tRRegex)
print("(Regex) ->src {", file=self.result)
self.inspect(val.GetValueForExpressionPath("->src"))
print("}", file=self.result)
elif rval.is_type("RUBY_T_DATA"):
tRTypedData = self.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=self.result)
self._append_command_output(
"p *(struct RTypedData *) %0#x" % val.GetValueAsUnsigned())
else:
print("T_DATA:", file=self.result)
self._append_command_output(
"p *(struct RData *) %0#x" % val.GetValueAsUnsigned())
elif rval.is_type("RUBY_T_NODE"):
tRNode = self.target.FindFirstType("struct RNode").GetPointerType()
rbNodeTypeMask = self.ruby_globals["RUBY_NODE_TYPEMASK"]
rbNodeTypeShift = self.ruby_globals["RUBY_NODE_TYPESHIFT"]
nd_type = (rval.flags & rbNodeTypeMask) >> rbNodeTypeShift
val = val.Cast(tRNode)
self._append_command_output("p (node_type) %d" % nd_type)
self._append_command_output("p *(struct RNode *) %0#x" % val.GetValueAsUnsigned())
elif rval.is_type("RUBY_T_IMEMO"):
imemo_type = ((rval.flags >> self.ruby_globals["RUBY_FL_USHIFT"])
& IMEMO_MASK)
print("T_IMEMO: ", file=self.result)
self._append_command_output("p (enum imemo_type) %d" % imemo_type)
self._append_command_output("p *(struct MEMO *) %0#x" % val.GetValueAsUnsigned())
elif rval.is_type("RUBY_T_FILE"):
self.generic_inspect(val, "RFile")
elif rval.is_type("RUBY_T_MOVED"):
self.generic_inspect(val, "RMoved")
elif rval.is_type("RUBY_T_MATCH"):
self.generic_inspect(val, "RMatch")
elif rval.is_type("RUBY_T_STRUCT"):
self.generic_inspect(val, "RStruct")
elif rval.is_type("RUBY_T_ZOMBIE"):
self.generic_inspect(val, "RZombie")
else:
print("Not-handled type %0#x" % rval.type, file=self.result)
print(val, file=self.result)
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