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Fix Re-initialization #343

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Merged
merged 2 commits into from
Jan 31, 2017
Merged

Fix Re-initialization #343

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9912712
Make RunString safer and more standard.
filmor Jan 26, 2017
af6d37f
Fix the shutdown issue by keeping PyMethodDef.
filmor Jan 26, 2017
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Make RunString safer and more standard.
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@filmor
filmor committed Jan 31, 2017
commit 9912712981867df79493832e32665127359f23dd
59 changes: 40 additions & 19 deletions src/runtime/pythonengine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -411,33 +411,54 @@ public static PyObject ModuleFromString(string name, string code)
/// executing the code string as a PyObject instance, or null if
/// an exception was raised.
/// </remarks>
public static PyObject RunString(string code)
public static PyObject RunString(
string code, IntPtr? globals = null, IntPtr? locals = null
)
{
IntPtr globals = Runtime.PyEval_GetGlobals();
IntPtr locals = Runtime.PyDict_New();

IntPtr builtins = Runtime.PyEval_GetBuiltins();
Runtime.PyDict_SetItemString(locals, "__builtins__", builtins);
bool borrowedGlobals = true;
if (globals == null)
{
globals = Runtime.PyEval_GetGlobals();
if (globals == IntPtr.Zero)
{
globals = Runtime.PyDict_New();
Runtime.PyDict_SetItemString(
globals.Value, "__builtins__",
Runtime.PyEval_GetBuiltins()
);
borrowedGlobals = false;
}
}

IntPtr flag = (IntPtr)257; /* Py_file_input */
IntPtr result = Runtime.PyRun_String(code, flag, globals, locals);
Runtime.XDecref(locals);
if (result == IntPtr.Zero)
bool borrowedLocals = true;
if (locals == null)
{
return null;
locals = Runtime.PyDict_New();
borrowedLocals = false;
}
return new PyObject(result);
}

public static PyObject RunString(string code, IntPtr globals, IntPtr locals)
{
IntPtr flag = (IntPtr)257; /* Py_file_input */
IntPtr result = Runtime.PyRun_String(code, flag, globals, locals);
if (result == IntPtr.Zero)

try
{
return null;
IntPtr result = Runtime.PyRun_String(
code, flag, globals.Value, locals.Value
);

if (Runtime.PyErr_Occurred() != 0)
{
throw new PythonException();
}

return new PyObject(result);
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The return within the try statement can get tricky.
http://stackoverflow.com/questions/3216046/does-the-c-sharp-finally-block-always-execute

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I don't really see the issue here.

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To elaborate, the link that you posted warns against relying on try {} finally {} as the finally may not be executed, but in such a case the problem has either exited already or is in the process of doing so, so we don't have to worry about dereferencing the Python resources anyhow.

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It was more of a caveat, return statements within try statements confuse me at times.

}
finally
{
if (!borrowedLocals)
Runtime.XDecref(locals.Value);
if (!borrowedGlobals)
Runtime.XDecref(globals.Value);
}
return new PyObject(result);
}
}

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