// Creates a new function object with the given code and constants. The new
// function will take over ownership of [bytecode] and [sourceLines]. It will
// copy [constants] into its own array.
public ObjFn(ObjModule module,
Obj[] constants,
int numUpvalues, int arity,
byte[] bytecode)
{
Bytecode = bytecode;
Constants = constants;
Module = module;
NumUpvalues = numUpvalues;
Arity = arity;
ClassObj = SophieVM.FnClass;
}
public SophieVM()
{
MethodNames = new List<string>();
ObjString name = Obj.MakeString("core");
// Implicitly create a "core" module for the built in libraries.
ObjModule coreModule = new ObjModule(name);
_modules = new ObjMap();
_modules.Set(Obj.Null, coreModule);
CoreLibrary core = new CoreLibrary(this);
core.InitializeCore();
// Load in System functions
Library.System.LoadSystemLibrary(this);
}
public static ObjFn Compile(SophieVM vm, ObjModule module, string sourcePath, string source, bool printErrors)
{
Parser parser = new Parser
{
Vm = vm,
Module = module,
SourcePath = sourcePath,
Source = source,
TokenStart = 0,
CurrentChar = 0,
CurrentLine = 1,
Current = { Type = TokenType.Error, Start = 0, Length = 0, Line = 0 },
PrintErrors = printErrors,
HasError = false,
Raw = ""
};
Compiler compiler = new Compiler(parser, null, true);
// Read the first token.
compiler.NextToken();
compiler.IgnoreNewlines();
while (!compiler.Match(TokenType.Eof))
{
compiler.Definition();
// If there is no newline, it must be the end of the block on the same line.
if (!compiler.MatchLine())
{
compiler.Consume(TokenType.Eof, "Expect end of file.");
break;
}
}
compiler.Emit(Instruction.Null);
compiler.Emit(Instruction.Return);
// See if there are any implicitly declared module-level variables that never
// got an explicit definition.
// TODO: It would be nice if the error was on the line where it was used.
for (int i = 0; i < parser.Module.Variables.Count; i++)
{
ModuleVariable t = parser.Module.Variables[i];
if (t.Container == Obj.Undefined)
{
compiler.Error(string.Format("Variable '{0}' is used but not defined.", t.Name));
}
}
return compiler.EndCompiler();
}
private ObjFiber LoadModule(Obj name, string source)
{
ObjModule module = GetModule(name);
// See if the module has already been loaded.
if (module == null)
{
module = new ObjModule(name as ObjString);
// Store it in the VM's module registry so we don't load the same module
// multiple times.
_modules.Set(name, module);
// Implicitly import the core module.
ObjModule coreModule = GetCoreModule();
foreach (ModuleVariable t in coreModule.Variables)
{
DefineVariable(module, t.Name, t.Container);
}
}
ObjFn fn = Compiler.Compile(this, module, name.ToString(), source, true);
if (fn == null)
{
// TODO: Should we still store the module even if it didn't compile?
return null;
}
ObjFiber moduleFiber = new ObjFiber(fn);
// Return the fiber that executes the module.
return moduleFiber;
}
internal int DefineVariable(ObjModule module, string name, Obj c)
{
if (module == null) module = GetCoreModule();
if (module.Variables.Count == ObjModule.MaxModuleVars) return -2;
// See if the variable is already explicitly or implicitly declared.
int symbol = module.Variables.FindIndex(m => m.Name == name);
if (symbol == -1)
{
// Brand new variable.
module.Variables.Add(new ModuleVariable { Name = name, Container = c });
symbol = module.Variables.Count - 1;
}
else if (module.Variables[symbol].Container == Obj.Undefined)
{
// Explicitly declaring an implicitly declared one. Mark it as defined.
module.Variables[symbol].Container = c;
}
else
{
// Already explicitly declared.
symbol = -1;
}
return symbol;
}
internal int DeclareVariable(ObjModule module, string name)
{
if (module == null) module = GetCoreModule();
if (module.Variables.Count == ObjModule.MaxModuleVars) return -2;
module.Variables.Add(new ModuleVariable { Name = name, Container = Obj.Undefined });
return module.Variables.Count - 1;
}