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Samaneh Berenjian via llvm-dev

2017-Jun-21 13:57 UTC

[llvm-dev] question about llvmlite

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
llvm.initialize()llvm.initialize_native_target()llvm.initialize_native_asmprinter()
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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Brian Cain via llvm-dev

2017-Jun-21 14:44 UTC

head link

[llvm-dev] question about llvmlite

I think you want “stmt.addr” and “stmt.data” instead of “self.addr”,
“self.data”.

 

You can check what attributes an object has with “dir(self)” and “dir(stmt)”. 
The error indicates you’ve referenced an attribute of “self” that doesn’t exist.

 

-Brian

 

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Samaneh
Berenjian via llvm-dev
Sent: Wednesday, June 21, 2017 8:58 AM
To: llvm-dev at lists.llvm.org
Subject: [llvm-dev] question about llvmlite

 

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_int

import archinfo

import llvmlite.ir as ll

import llvmlite.binding as llvm

import pyvex

 

CODE = b"\x55\x48\x8b\x05\xb8\x13\x00\x00"

mehran = -100

 

llvm.initialize()

llvm.initialize_native_target()

llvm.initialize_native_asmprinter()

 

module = ll.Module()

func_ty = ll.FunctionType(ll.VoidType(), [])

func = ll.Function(module, func_ty, name='read_instructions')

a = func.args

bb_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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Samaneh Berenjian via llvm-dev

2017-Jun-21 15:41 UTC

head link

[llvm-dev] question about llvmlite

Thank you for the reply. In the case of my code, it does not matter to use stmt
or self. I even did your suggestion but right now it does not know the self. :(

On Wed, 06/21/2017 10:44 AM, Brian Cain &lt;bcain at codeaurora.org&gt;
wrote:> 



I think you want “stmt.addr” and “stmt.data” instead of “self.addr”,
“self.data”.
 
You can check what attributes an object has with “dir(self)” and “dir(stmt)”. 
The error indicates you’ve referenced an attribute of “self” that doesn’t exist.
 
-Brian
 
From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Samaneh
Berenjian via llvm-dev> Sent: Wednesday, June 21, 2017 8:58 AM
> To: llvm-dev at lists.llvm.org
> Subject: [llvm-dev] question about llvmlite 
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_int
import archinfo
import llvmlite.ir as ll
import llvmlite.binding as llvm
import pyvex
 
CODE = b"\x55\x48\x8b\x05\xb8\x13\x00\x00"
mehran = -100
 
llvm.initialize()
llvm.initialize_native_target()
llvm.initialize_native_asmprinter()
 
module = ll.Module()
func_ty = ll.FunctionType(ll.VoidType(), [])
func = ll.Function(module, func_ty, name='read_instructions')
a = func.args
bb_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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