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import lldb
from lldb_rb.constants import *
from lldb_rb.utils import *
from lldb_rb.rb_base_command import RbBaseCommand
class RbID2StrCommand(RbBaseCommand):
program = "rb_id2str"
help_string = "convert and print a Ruby ID to a C string and print it to the LLDB console"
def call(self, debugger, command, exe_ctx, result):
global_symbols = self.target.FindFirstGlobalVariable("ruby_global_symbols")
id_val = self.frame.EvaluateExpression(command).GetValueAsUnsigned()
num = self.rb_id_to_serial(id_val)
last_id = global_symbols.GetChildMemberWithName("last_id").GetValueAsUnsigned()
ID_ENTRY_SIZE = 2
ID_ENTRY_UNIT = int(self.target.FindFirstGlobalVariable("ID_ENTRY_UNIT").GetValue())
ids = global_symbols.GetChildMemberWithName("ids")
if num <= last_id:
idx = num // ID_ENTRY_UNIT
ary = self.rb_ary_entry(ids, idx, result)
pos = (num % ID_ENTRY_UNIT) * ID_ENTRY_SIZE
id_str = self.rb_ary_entry(ary, pos, result)
RbInspector(debugger, result, self.ruby_globals).inspect(id_str)
def rb_id_to_serial(self, id_val):
if id_val > self.ruby_globals["tLAST_OP_ID"]:
return id_val >> self.ruby_globals["RUBY_ID_SCOPE_SHIFT"]
else:
return id_val
def rb_ary_entry(self, ary, idx, result):
tRArray = self.target.FindFirstType("struct RArray").GetPointerType()
ary = ary.Cast(tRArray)
flags = ary.GetValueForExpressionPath("->flags").GetValueAsUnsigned()
if flags & self.ruby_globals["RUBY_FL_USER1"]:
ptr = ary.GetValueForExpressionPath("->as.ary")
else:
ptr = ary.GetValueForExpressionPath("->as.heap.ptr")
ptr_addr = ptr.GetValueAsUnsigned() + (idx * ptr.GetType().GetByteSize())
return self.target.CreateValueFromAddress("ary_entry[%d]" % idx, lldb.SBAddress(ptr_addr, self.target), ptr.GetType().GetPointeeType())
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