unsafe public void StackAllocatorAlloc()
{
byte *buffer = stackAllocator.Allocate <byte>(Bytes);
for (int i = 0; i < Bytes; i++)
{
unchecked
{
buffer[i] = (byte)i;
}
}
stackAllocator.Free(buffer);
}
public void StackAllocatorTest()
{
StackAllocator allocator = new StackAllocator(1000);
Assert.AreSame(allocator, Allocator.GetAllocatorByID(allocator.ID));
Assert.IsTrue(Allocator.IsCached(allocator));
int *p = allocator.Allocate <int>(4);
for (int i = 0; i < 4; i++)
{
p[i] = i + 1;
}
Assert.AreEqual(1, p[0]);
Assert.AreEqual(2, p[1]);
Assert.AreEqual(3, p[2]);
Assert.AreEqual(4, p[3]);
p = allocator.Reallocate(p, 6);
Assert.AreEqual(1, p[0]);
Assert.AreEqual(2, p[1]);
Assert.AreEqual(3, p[2]);
Assert.AreEqual(4, p[3]);
Assert.AreEqual(0, p[4]);
Assert.AreEqual(0, p[5]);
allocator.Free(p);
allocator.Dispose();
Assert.IsFalse(Allocator.IsCached(allocator));
}
private static Node HandleCallWindowsAbi(IntrusiveList <Node> nodes, StackAllocator stackAlloc, Node node, Operation operation)
{
Operand dest = operation.Destination;
// Handle struct arguments.
int retArgs = 0;
int stackAllocOffset = 0;
int AllocateOnStack(int size)
{
// We assume that the stack allocator is initially empty (TotalSize = 0).
// Taking that into account, we can reuse the space allocated for other
// calls by keeping track of our own allocated size (stackAllocOffset).
// If the space allocated is not big enough, then we just expand it.
int offset = stackAllocOffset;
if (stackAllocOffset + size > stackAlloc.TotalSize)
{
stackAlloc.Allocate((stackAllocOffset + size) - stackAlloc.TotalSize);
}
stackAllocOffset += size;
return(offset);
}
Operand arg0Reg = null;
if (dest != null && dest.Type == OperandType.V128)
{
int stackOffset = AllocateOnStack(dest.Type.GetSizeInBytes());
arg0Reg = Gpr(CallingConvention.GetIntArgumentRegister(0), OperandType.I64);
Operation allocOp = new Operation(Instruction.StackAlloc, arg0Reg, Const(stackOffset));
nodes.AddBefore(node, allocOp);
retArgs = 1;
}
int argsCount = operation.SourcesCount - 1;
int maxArgs = CallingConvention.GetArgumentsOnRegsCount() - retArgs;
if (argsCount > maxArgs)
{
argsCount = maxArgs;
}
Operand[] sources = new Operand[1 + retArgs + argsCount];
sources[0] = operation.GetSource(0);
if (arg0Reg != null)
{
sources[1] = arg0Reg;
}
for (int index = 1; index < operation.SourcesCount; index++)
{
Operand source = operation.GetSource(index);
if (source.Type == OperandType.V128)
{
Operand stackAddr = Local(OperandType.I64);
int stackOffset = AllocateOnStack(source.Type.GetSizeInBytes());
nodes.AddBefore(node, new Operation(Instruction.StackAlloc, stackAddr, Const(stackOffset)));
Operation storeOp = new Operation(Instruction.Store, null, stackAddr, source);
HandleConstantCopy(nodes, nodes.AddBefore(node, storeOp), storeOp);
operation.SetSource(index, stackAddr);
}
}
// Handle arguments passed on registers.
for (int index = 0; index < argsCount; index++)
{
Operand source = operation.GetSource(index + 1);
Operand argReg;
int argIndex = index + retArgs;
if (source.Type.IsInteger())
{
argReg = Gpr(CallingConvention.GetIntArgumentRegister(argIndex), source.Type);
}
else
{
argReg = Xmm(CallingConvention.GetVecArgumentRegister(argIndex), source.Type);
}
Operation copyOp = new Operation(Instruction.Copy, argReg, source);
HandleConstantCopy(nodes, nodes.AddBefore(node, copyOp), copyOp);
sources[1 + retArgs + index] = argReg;
}
// The remaining arguments (those that are not passed on registers)
// should be passed on the stack, we write them to the stack with "SpillArg".
for (int index = argsCount; index < operation.SourcesCount - 1; index++)
{
Operand source = operation.GetSource(index + 1);
Operand offset = new Operand((index + retArgs) * 8);
Operation spillOp = new Operation(Instruction.SpillArg, null, offset, source);
HandleConstantCopy(nodes, nodes.AddBefore(node, spillOp), spillOp);
}
if (dest != null)
{
if (dest.Type == OperandType.V128)
{
Operand retValueAddr = Local(OperandType.I64);
nodes.AddBefore(node, new Operation(Instruction.Copy, retValueAddr, arg0Reg));
Operation loadOp = new Operation(Instruction.Load, dest, retValueAddr);
node = nodes.AddAfter(node, loadOp);
operation.Destination = null;
}
else
{
Operand retReg = dest.Type.IsInteger()
? Gpr(CallingConvention.GetIntReturnRegister(), dest.Type)
: Xmm(CallingConvention.GetVecReturnRegister(), dest.Type);
Operation copyOp = new Operation(Instruction.Copy, dest, retReg);
node = nodes.AddAfter(node, copyOp);
operation.Destination = retReg;
}
}
operation.SetSources(sources);
return(node);
}