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Detect py arch #961

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Merged
merged 5 commits into from
Oct 1, 2019
Merged

Detect py arch #961

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2048616
Detect python interpreter arch
jmlidbetter Sep 24, 2019
d8040fa
Updates PyLong_FromUnsignedLong to be interpreter arch aware
jmlidbetter Sep 24, 2019
c337688
Makes PyLong_AsUnsignedLong interpreter arch aware
jmlidbetter Sep 24, 2019
fb1e1ad
Updates CHANGELOG.md
jmlidbetter Sep 25, 2019
ac9294d
Gets size of C long from Is32Bit and IsWindows
jmlidbetter Oct 1, 2019
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Detect python interpreter arch
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@jmlidbetter
jmlidbetter committed Sep 25, 2019
commit 2048616678e171f121935ccd48e7c71c377032be
45 changes: 45 additions & 0 deletions src/runtime/runtime.cs
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Expand Up @@ -155,6 +155,11 @@ public class Runtime
/// </summary>
public static string MachineName { get; private set; }

/// <summary>
/// Gets the architecture the python interpreter is using as reported by python's struct.calcsize("P")
/// </summary>
public static MachineType PythonArchitecture { get; private set; }

internal static bool IsPython2 = pyversionnumber < 30;
internal static bool IsPython3 = pyversionnumber >= 30;

Expand Down Expand Up @@ -192,6 +197,9 @@ internal static void Initialize(bool initSigs = false)

IntPtr op;
IntPtr dict;

InitializePythonArch();

if (IsPython3)
{
op = PyImport_ImportModule("builtins");
Expand Down Expand Up @@ -371,6 +379,43 @@ private static void InitializePlatformData()
Machine = MType;
}

/// <summary>
/// Initializes the architecture used within the python interpreter
///
/// For various reasons the python interpreter often has a different
/// architecture to that of the machine. For example on a 64 bit Windows
/// platform the CPython interpreter is compiled with 32 bit longs.
/// This method will allow pythonnet to determine at runtime how big
/// python's longs are.
/// </summary>
private static void InitializePythonArch()
{
IntPtr structModule = PyImport_ImportModule("struct");
IntPtr calcsizeMethod = PyObject_GetAttrString(structModule, "calcsize");
IntPtr methodArgs = PyTuple_New(1);
IntPtr pString = PyString_FromString("P");

if(PyTuple_SetItem(methodArgs, 0, pString) != 0)
{
PythonArchitecture = MachineType.Other;
return;
}

var result = PyLong_AsLong(PyObject_Call(calcsizeMethod, methodArgs, IntPtr.Zero));

switch(result){
case 4:
PythonArchitecture = MachineType.i386;
break;
case 8:
PythonArchitecture = MachineType.x86_64;
break;
default:
PythonArchitecture = MachineType.Other;
break;
}
}

internal static void Shutdown()
{
AssemblyManager.Shutdown();
Expand Down