[llvm-dev] question about llvmlite

Samaneh Berenjian via llvm-dev llvm-dev at lists.llvm.org
Wed Jun 21 06:57:37 PDT 2017

​Hi all,
I am using llvmlite for pyvex and I want the output of my code (which is written based on llvmlite) to be like pyvex. In pyvex, (https://github.com/angr/pyvex). Considering pyvex, I tried to implement the following statements in pyvex to llvmlite:
for stmt in irsb.statements:   if isinstance(stmt, pyvex.IRStmt.Store):      print "ST%s(%s) = %s" % (self.endness[-2:].lower(), self.addr, self.data)  (which gets the data in a register and store it in another register)
I translate it in llvmlite as follows:
from ctypes import CFUNCTYPE, c_intimport archinfoimport llvmlite.ir as llimport llvmlite.binding as llvmimport pyvex
CODE = b"\x55\x48\x8b\x05\xb8\x13\x00\x00"mehran = -100
module = ll.Module()func_ty = ll.FunctionType(ll.VoidType(), [])func = ll.Function(module, func_ty, name='read_instructions')a = func.argsbb_entry = func.append_basic_block('entry')irbuilder = ll.IRBuilder(bb_entry)int_type = ll.IntType(64);irsb = pyvex.block.IRSB(CODE, 0x400400, archinfo.ArchAMD64())

for stmt in irsb.statements:
    #if isinstance(pyvex.IRStmt.Store):    with irbuilder.if_then(stmt, pyvex.IRStmt.Store):
       t = irbuilder.load_reg(ll.IntType(64), stmt.data)       t1 = irbuilder.load_reg(ll.IntType(64), stmt.addr)       tcall = irbuilder.call(func, [t])       t1call = irbuilder.call(func, [t1])       result  =  irbuilder.store_reg(ll.Constant(ll.IntType(64), t), ll.IntType(64), t1)       irbuilder.ret( result )       print( module )       target = llvm.Target.from_default_triple()       target_machine = target.create_target_machine()       backing_mod = llvm.parse_assembly("")       engine = llvm.create_mcjit_compiler(backing_mod, target_machine)       mod = llvm.parse_assembly( str( module ) )       mod.verify()       engine.add_module(mod)       engine.finalize_object()       func_ptr = engine.get_function_address("read_instructions")       c_fn_fib = CFUNCTYPE(c_int64, c_int64)(func_ptr)
           Having the above code, when running it, I am stopped with error:AttributeError: 'IMark' object has no attribute 'data'
Can anyone help me in this way?Thank you
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