private void ProcessExternalMethod(MethodBase aMethod)
{
ILCompiler.Logger.Write("@Processor", aMethod.FullName(), "Processing External Method");
if (!aMethod.IsStatic)
{
throw new Exception("Non-static extern fields not supported");
}
var aAttributeData = (DllImportAttribute)aMethod.GetCustomAttribute(typeof(DllImportAttribute));
if (aAttributeData == null)
{
throw new Exception("[DllImport]: Invalid Build");
}
string xLibName = aAttributeData.Value;
string xMethodLabel = aMethod.FullName();
string xMethodName = aAttributeData.EntryPoint == null ? aMethod.Name : aAttributeData.EntryPoint;
int xCalliConvention = (int)aAttributeData.CallingConvention;
bool IsAtomixCompiled = (xCalliConvention == (int)aMethod.CallingConvention);
var xParms = aMethod.GetParameters();
/*
* For now assume normal calli method
* - Push Library Name
* - Push Function Name
* - Call Kernel API
* - Jump to function address
*/
Core.AssemblerCode.Add(new Label(xMethodLabel));
// standard calli header
Core.AssemblerCode.Add(new Push {
DestinationReg = Registers.EBP
});
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.EBP, SourceReg = Registers.ESP
});
// load and get address of external function
Core.AssemblerCode.Add(new Push {
DestinationRef = AddStringData(xLibName)
});
Core.AssemblerCode.Add(new Push {
DestinationRef = AddStringData(xMethodName)
});
Core.AssemblerCode.Add(new Call(Helper.lblImportDll, true));
Core.AssemblerCode.Add(new Test {
DestinationReg = Registers.ECX, SourceRef = "0x2"
});
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
int ArgSize = ILHelper.GetArgumentsSize(aMethod);
int xReturnSize = ILHelper.GetReturnTypeSize(aMethod);
int xRetSize = (ArgSize - xReturnSize);
#region _CALLI_HEADER_
if (IsAtomixCompiled)
{
// push the arguments from left to right
for (int i = 0; i < xParms.Length; i++)
{
int xDisplacement = ILHelper.GetArgumentDisplacement(aMethod, i);
int xArgSize = aMethod.GetParameters()[i].ParameterType.SizeOf().Align();
for (int j = 0; j < (xArgSize / 4); j++)
{
Core.AssemblerCode.Add(
new Push
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = xDisplacement - (j * 4)
});
}
}
if (xRetSize < 0)
{
Core.AssemblerCode.Add(new Sub {
DestinationReg = Registers.ESP, SourceRef = "0x" + (-xRetSize).ToString("x")
});
xRetSize = 0;
}
}
else if (xCalliConvention == (int)CallingConvention.StdCall)
{
// push arguments to the stack from right to left
for (int i = xParms.Length - 1; i >= 0; i--)
{
int xDisplacement = ILHelper.GetArgumentDisplacement(aMethod, i);
int xArgSize = aMethod.GetParameters()[i].ParameterType.SizeOf().Align();
for (int j = 0; j < (xArgSize / 4); j++)
{
Core.AssemblerCode.Add(
new Push
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = xDisplacement - (j * 4)
});
}
}
}
#endregion
// Call the function
Core.AssemblerCode.Add(new Call("EAX"));
#region _CALLI_FOOTER_
if (xReturnSize > 0)
{
var xOffset = ILHelper.GetResultCodeOffset(xReturnSize, ArgSize);
if (IsAtomixCompiled)
{
// For return type Method
for (int i = 0; i < xReturnSize / 4; i++)
{
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
Core.AssemblerCode.Add(new Mov
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = (xOffset + (i * 4)),
SourceReg = Registers.EAX
});
}
}
else if (xCalliConvention == (int)CallingConvention.StdCall)
{
if (xReturnSize > 8)
{
throw new Exception("[Extern]: Unsupported Return Size for StdCall");
}
Core.AssemblerCode.Add(new Mov
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = xOffset,
SourceReg = Registers.EAX
});
if (xReturnSize == 8)
{
Core.AssemblerCode.Add(new Mov
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = (xOffset + 4),
SourceReg = Registers.EAX
});
}
}
}
#endregion
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.ECX, SourceRef = "0x0"
});
Core.AssemblerCode.Add(new Leave());
Core.AssemblerCode.Add(new Ret {
Address = (byte)xRetSize
});
BuildDefinations.Add(aMethod);
}
private void ProcessDelegate(MethodBase xMethod)
{
var lbl = xMethod.FullName();
var lbl_exception = lbl + ".Error";
var lbl_end = lbl + ".End";
Core.AssemblerCode.Add(new Label(lbl));
// Calli header
Core.AssemblerCode.Add(new Push {
DestinationReg = Registers.EBP
});
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.EBP, SourceReg = Registers.ESP
});
if (lbl.Contains("ctor"))
{
// Load Argument
((Ldarg)MSIL[ILCode.Ldarg]).Execute2(0, xMethod);
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EBX
});
((Ldarg)MSIL[ILCode.Ldarg]).Execute2(2, xMethod); // The pointer
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
Core.AssemblerCode.Add(new Add {
DestinationReg = Registers.EBX, SourceRef = "0xC"
});
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.EBX, DestinationIndirect = true, SourceReg = Registers.EAX
});
((Ldarg)MSIL[ILCode.Ldarg]).Execute2(1, xMethod); // The Object
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
Core.AssemblerCode.Add(new Add {
DestinationReg = Registers.EBX, SourceRef = "0x4"
});
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.EBX, DestinationIndirect = true, SourceReg = Registers.EAX
});
// calli footer
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.ECX, SourceRef = "0x0"
});
Core.AssemblerCode.Add(new Leave());
Core.AssemblerCode.Add(new Ret {
Address = 0xC
}); // Memory location + Object + Intptr
}
else if (lbl.Contains("Invoke"))
{
// Load Reference
((Ldarg)MSIL[ILCode.Ldarg]).Execute2(0, xMethod);
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
Core.AssemblerCode.Add(new Add {
DestinationReg = Registers.EAX, SourceRef = "0xC"
});
// If it is a non static field than get its parent Type memory location (object in constructor)
if (!xMethod.IsStatic)
{
Core.AssemblerCode.Add(new Push {
DestinationReg = Registers.EAX, DestinationDisplacement = 0x4, DestinationIndirect = true
});
}
var xParms = xMethod.GetParameters();
int xSize = ILHelper.GetArgumentsSize(xMethod);
// Load arguments to throw
int xArgSize;
for (ushort i = 1; i <= xParms.Length; i++)
{
// New Code
int xDisplacement = ILHelper.GetArgumentDisplacement(xMethod, i);
if (xMethod.IsStatic)
{
xArgSize = xMethod.GetParameters()[i].ParameterType.SizeOf().Align();
}
else
{
xArgSize = xMethod.GetParameters()[i - 1].ParameterType.SizeOf().Align();
}
for (int j = 0; j < (xArgSize / 4); j++)
{
Core.AssemblerCode.Add(
new Push
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = xDisplacement - (j * 4)
});
}
}
// Call the function
Core.AssemblerCode.Add(new Call("[EAX]"));
// Check for anytype of exception
Core.AssemblerCode.Add(new Test {
DestinationReg = Registers.ECX, SourceRef = "0x2"
});
Core.AssemblerCode.Add(new Jmp {
Condition = ConditionalJumpEnum.JNE, DestinationRef = lbl_exception
});
// calli footer
Core.AssemblerCode.Add(new Label(lbl_end));
Core.AssemblerCode.Add(new Mov {
DestinationReg = Registers.ECX, SourceRef = "0x0"
});
Core.AssemblerCode.Add(new Label(lbl_exception));
int xReturnSize = ILHelper.GetReturnTypeSize(xMethod);
if (xReturnSize > 0)
{
// For return type Method
var xOffset = ILHelper.GetResultCodeOffset(xReturnSize, xSize);
for (int i = 0; i < xReturnSize / 4; i++)
{
Core.AssemblerCode.Add(new Pop {
DestinationReg = Registers.EAX
});
Core.AssemblerCode.Add(new Mov
{
DestinationReg = Registers.EBP,
DestinationIndirect = true,
DestinationDisplacement = (int)(xOffset + ((i + 0) * 4)),
SourceReg = Registers.EAX
});
}
}
byte xRetSize = (byte)Math.Max(0, xSize - xReturnSize);
Core.AssemblerCode.Add(new Leave());
Core.AssemblerCode.Add(new Ret {
Address = xRetSize
}); // Parameter + Memory
}
BuildDefinations.Add(xMethod);
}