public List <Opcode> BuildProgram()
{
var program = new List <Opcode>();
foreach (var objectFile in objectFiles.Values)
{
var linkedObject = new CodePart();
foreach (var part in objectFile.Parts)
{
AddInitializationCode(linkedObject, part);
linkedObject.FunctionsCode.AddRange(part.FunctionsCode);
linkedObject.MainCode.AddRange(part.MainCode);
}
// we assume that the first object is the main program and the rest are subprograms/libraries
bool isMainProgram = (objectFile == objectFiles.Values.First());
// add a jump to the entry point so the execution skips the functions code
if (isMainProgram)
{
AddJumpToEntryPoint(linkedObject);
}
// add an instruction to indicate the end of the program
AddEndOfProgram(linkedObject, isMainProgram);
// save the entry point of the object
objectFile.EntryPointLabel = GetEntryPointLabel(linkedObject);
// add the linked object to the final program
program.AddRange(linkedObject.MergeSections());
}
// replace all the labels references with the corresponding address
ReplaceLabels(program);
return(program);
}
public List<Opcode> BuildProgram()
{
List<Opcode> program = new List<Opcode>();
foreach (var objectFile in _objectFiles.Values)
{
CodePart linkedObject = new CodePart();
foreach (var part in objectFile.Parts)
{
AddInitializationCode(linkedObject, part);
linkedObject.FunctionsCode.AddRange(part.FunctionsCode);
linkedObject.MainCode.AddRange(part.MainCode);
}
// we assume that the first object is the main program and the rest are subprograms/libraries
bool isMainProgram = (objectFile == _objectFiles.Values.First());
// add a jump to the entry point so the execution skips the functions code
if (isMainProgram)
AddJumpToEntryPoint(linkedObject);
// add an instruction to indicate the end of the program
AddEndOfProgram(linkedObject, isMainProgram);
// save the entry point of the object
objectFile.EntryPointLabel = GetEntryPointLabel(linkedObject);
// add the linked object to the final program
program.AddRange(linkedObject.MergeSections());
}
// replace all the labels references with the corresponding address
ReplaceLabels(program);
return program;
}
private void AddJumpToEntryPoint(CodePart linkedObject)
{
if (linkedObject.MainCode.Count > 0)
{
OpcodeBranchJump jumpOpcode = new OpcodeBranchJump();
jumpOpcode.DestinationLabel = GetEntryPointLabel(linkedObject);
linkedObject.FunctionsCode.Insert(0, jumpOpcode);
}
}
protected virtual void AddEndOfProgram(CodePart linkedObject, bool isMainProgram)
{
if (isMainProgram)
{
linkedObject.MainCode.Add(new OpcodeEOP());
}
else
{
linkedObject.MainCode.Add(new OpcodeReturn());
}
}
protected virtual void AddEndOfProgram(CodePart linkedObject, bool isMainProgram)
{
if (isMainProgram)
{
linkedObject.MainCode.Add(new OpcodeEOP());
}
else
{
linkedObject.MainCode.Add(new OpcodeReturn());
}
}
private string GetEntryPointLabel(CodePart linkedObject)
{
List <Opcode> codeSection = linkedObject.InitializationCode.Count > 0 ? linkedObject.InitializationCode : linkedObject.MainCode;
return(codeSection[0].Label);
}
protected virtual void AddInitializationCode(CodePart linkedObject, CodePart part)
{
linkedObject.InitializationCode.AddRange(part.InitializationCode);
}
protected override void AddInitializationCode(CodePart linkedObject, CodePart part)
{
linkedObject.MainCode.AddRange(part.InitializationCode);
}
protected override void AddEndOfProgram(CodePart linkedObject, bool isMainProgram)
{
linkedObject.MainCode.Add(new OpcodeEOF());
}
private string GetEntryPointLabel(CodePart linkedObject)
{
List<Opcode> codeSection = linkedObject.InitializationCode.Count > 0 ? linkedObject.InitializationCode : linkedObject.MainCode;
return codeSection[0].Label;
}
private void AddJumpToEntryPoint(CodePart linkedObject)
{
if (linkedObject.MainCode.Count > 0)
{
OpcodeBranchJump jumpOpcode = new OpcodeBranchJump();
jumpOpcode.DestinationLabel = GetEntryPointLabel(linkedObject);
linkedObject.FunctionsCode.Insert(0, jumpOpcode);
}
}
protected virtual void AddInitializationCode(CodePart linkedObject, CodePart part)
{
linkedObject.InitializationCode.AddRange(part.InitializationCode);
}
protected override void AddInitializationCode(CodePart linkedObject, CodePart part)
{
linkedObject.MainCode.AddRange(part.InitializationCode);
}
protected override void AddEndOfProgram(CodePart linkedObject, bool isMainProgram)
{
linkedObject.MainCode.Add(new OpcodeEOF());
}