Added abs built-in function

WhatIsImplemented.md

@@ -26,7 +26,7 @@ Example:
 
 
 # Built-in
-* abs (Not Implemented)
+* abs (Fully Implemented)
 * all (Not Implemented)
 * any (Not Implemented)
 * ascii (Not Implemented)

pyState/functions/abs.py

@@ -0,0 +1,57 @@
+from pyObjectManager.Int import Int
+from pyObjectManager.Real import Real
+from pyObjectManager.BitVec import BitVec
+from pyObjectManager.String import String
+import pyState
+import logging
+import z3
+
+logger = logging.getLogger("pyState:functions:abs")
+
+
+def handle(state,call,obj,ctx=None):
+    """
+    Simulate abs funcion
+    """
+    ctx = ctx if ctx is not None else state.ctx
+
+    # Resolve the object
+    objs = state.resolveObject(obj,ctx=ctx)
+
+    # Resolve calls if we need to
+    retObjs = [x for x in objs if type(x) is pyState.ReturnObject]
+    if len(retObjs) > 0:
+        return retObjs
+
+    retList = []
+
+    # Loop through all possible inputs
+    for obj in objs:
+
+        s = obj.state.copy()
+
+        obj.setState(s)
+
+        if type(obj) not in [Int, Real, BitVec]:
+            err = "handle: This shouldn't happen. Possibly a target program bug? Got obj type {0}".format(type(obj))
+            logger.error(err)
+            raise Exception(err)
+
+        oldObj = obj.getZ3Object()
+
+        newObj = obj.getZ3Object(increment=True)
+
+        # Add a little z3 If statement to mimic abs() call
+        s.addConstraint(
+            newObj == 
+            z3.If(
+                oldObj > 0,
+                oldObj,
+                -oldObj
+                )
+            )
+
+        retList.append(obj.copy())
+
+    # Return all options
+    return retList

tests/test_function_abs.py

@@ -0,0 +1,43 @@
+import sys, os
+myPath = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, myPath + '/../')
+
+import logging
+import Colorer
+logging.basicConfig(level=logging.DEBUG,format='%(name)s - %(levelname)s - %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
+
+import ast
+import z3
+from pyPath import Path
+from pyPathGroup import PathGroup
+import pytest
+from pyObjectManager.Int import Int
+from pyObjectManager.Real import Real
+from pyObjectManager.BitVec import BitVec
+from pyObjectManager.List import List
+
+test1 = """
+x = 10
+y = -10
+a = abs(x)
+b = abs(y)
+c = abs(10)
+d = abs(-10)
+"""
+
+def test_funcion_abs():
+    b = ast.parse(test1).body
+    p = Path(b,source=test1)
+    pg = PathGroup(p)
+
+    pg.explore()
+
+    assert len(pg.completed) == 1
+    assert pg.completed[0].state.any_int('a') == 10
+    assert pg.completed[0].state.any_int('b') == 10
+    assert pg.completed[0].state.any_int('c') == 10
+    assert pg.completed[0].state.any_int('d') == 10
+
+
+
+