/// <summary>An initialiser expression.</summary>
public object InitExpression()
{
// Opcode:
OpCode opcode = OpCodes.Get(ReadByte());
if (opcode.AllowedInInit)
{
// Read its immediates:
object imms = opcode.ReadImmediates(this);
if (ReadByte() != 0x0b)
{
throw new Exception("Init expr did not end with the 'end' opcode.");
}
return(imms);
}
throw new Exception("unexpected opcode in initializer expression (" + opcode.Code + ").");
}
private FullOpcode Parse(string line)
{
if (string.IsNullOrEmpty(line))
{
return(null);
}
line = line.Trim();
var parts = Tokenize(line);
if (parts[0].Length < 0)
{
return(null);
}
if (Enum.TryParse(parts[0], true, out OpcodeEnum opcode))
{
ushort parameter = 0;
var mode = AddressingMode.Implied;
if (parts.Length > 1)
{
//All indirect modes
if (parts[1] == "(")
{
parameter = ParseNumber(parts[2], out mode);
if (parts.Length == 5)
{
mode = parts[3].ToUpper() == "X"
? AddressingMode.IndexedIndirect
: AddressingMode.IndirectIndexed;
}
else if (parts.Length == 4)
{
mode = AddressingMode.Indirect;
}
}
else
{
parameter = ParseNumber(parts[1], out mode);
bool?X = null;
if (mode == AddressingMode.Implied)
{
if (parts.Length == 3)
{
X = parts[2].ToUpper() == "X";
}
if (parameter > 255)
{
if (!X.HasValue)
{
mode = AddressingMode.Absolute;
}
else if (X == false)
{
mode = AddressingMode.AbsoluteY;
}
else
{
mode = AddressingMode.AbsoluteX;
}
}
else
{
if (!X.HasValue)
{
mode = AddressingMode.ZeroPage;
}
else if (X == false)
{
mode = AddressingMode.ZeroPageY;
}
else
{
mode = AddressingMode.ZeroPageX;
}
}
}
}
}
return(new FullOpcode(_opcodes.Get(opcode, mode), parameter, 0));
}
else
{
Console.WriteLine("Invalid opcode");
}
return(null);
}
public FunctionBody(Reader reader, int index)
{
// Apply current body:
reader.FunctionBody = this;
// Clear the block stack:
reader.BlockStack.Count = 0;
// Get the sig:
Signature = reader.Module.FunctionSection.Types[index];
// Sizes:
int bodySize = (int)reader.VarUInt32();
// Max (bodySize includes locals); -1 to exclude the final byte:
long max = reader.Position + bodySize - 1;
// Locals:
int localCount = (int)reader.VarUInt32();
List <FunctionLocal> ilLocal = new List <FunctionLocal>(localCount);
Locals = ilLocal;
for (int i = 0; i < localCount; i++)
{
// # of this and its type:
int count = (int)reader.VarUInt32();
Type type = reader.ValueTypeConverted();
for (int c = 0; c < count; c++)
{
// Define it:
ilLocal.Add(new FunctionLocal(type));
}
}
// Create the root block instruction (no opcode):
Root = new CompilerStack <Instruction>();
// While there is more code..
while (reader.Position < max)
{
// Opcode:
OpCode opcode = OpCodes.Get(reader.ReadByte());
if (opcode == null || opcode.OnOutputIL == null)
{
throw new Exception("WebAssembly function body went out of alignment (Function " + Signature.Index + ")");
}
if (opcode.Ignored)
{
// Don't create - just load immediates:
if (opcode.HasImmediates)
{
opcode.ReadImmediates(reader);
}
}
else
{
// Create an instruction:
Instruction instruction = new Instruction();
instruction.OpCode = opcode;
// Apply default in/out:
instruction.InputCount = opcode.InputCount;
instruction.ReturnType = opcode.ReturnType;
reader.Instruction = instruction;
// Add all of its immediates:
if (opcode.HasImmediates)
{
// Load the immediates now:
instruction.Immediates = opcode.ReadImmediates(reader);
}
// Manage the stack now - if it has a fixed number of inputs
// we pop those from the stack and add them to the instruction:
for (int i = 0; i < instruction.InputCount; i++)
{
// Add the input to the front of the input set:
instruction.PrependInput(Root.Pop());
}
if (instruction.ReturnType != typeof(void))
{
// Push to Root:
Root.Push(instruction);
}
}
}
if (reader.ReadByte() != 0x0b)
{
throw new Exception("A function body did not end correctly.");
}
}