public override void Compile(Emitter.Emitter emitter)
{
if (Expression.GetExpressionType(emitter) != "bool")
Error(Resources.errBoolExpected);
Expression.Compile(emitter);
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual();
}
/// <summary>
/// Compare two values for their relative order: less and greater
/// </summary>
/// <param name="emitter">Emitter link</param>
/// <param name="leftType">Left-hand argument type</param>
/// <param name="rightType">Left-hand argument type</param>
private void CompileRelation(Emitter.Emitter emitter, string leftType, string rightType)
{
if(leftType == "string")
{
var method = emitter.AssemblyImport(typeof(string).GetMethod("Compare", new[] { typeof(string), typeof(string) }));
emitter.EmitCall(method);
emitter.EmitLoadBool(false);
}
switch (ComparisonType)
{
case LexemType.Less: emitter.EmitCompareLess(); break;
case LexemType.LessEqual: emitter.EmitCompareGreater();
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual(); break;
case LexemType.Greater: emitter.EmitCompareGreater(); break;
case LexemType.GreaterEqual: emitter.EmitCompareLess();
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual(); break;
}
}
/// <summary>
/// Compare two values for their equality
/// </summary>
/// <param name="emitter">Emitter link</param>
/// <param name="leftType">Left-hand argument type</param>
/// <param name="rightType">Left-hand argument type</param>
private void CompileEquality(Emitter.Emitter emitter, string leftType, string rightType)
{
var basicTypes = new[] { "bool", "int", "float", "string" };
if (leftType.IsAnyOf(basicTypes))
{
// compare strings
if (leftType == "string")
{
var method = emitter.AssemblyImport(typeof(string).GetMethod("Compare", new[] { typeof(string), typeof(string) }));
emitter.EmitCall(method);
emitter.EmitLoadBool(false);
}
emitter.EmitCompareEqual();
}
// long, complex and others
else
{
System.Reflection.MethodInfo method;
if(leftType.IsAnyOf("long", "complex"))
{
var type = (leftType == "long" ? typeof(System.Numerics.BigInteger) : typeof(System.Numerics.Complex));
method = type.GetMethod("op_Equality", new[] { type, type });
}
else
method = typeof(MirelleStdlib.Compare).GetMethod("Equal", new[] { typeof(object), typeof(object) });
emitter.EmitCall(emitter.AssemblyImport(method));
}
// invert ?
if (ComparisonType == LexemType.NotEqual)
{
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual();
}
}
public override void Compile(Emitter.Emitter emitter)
{
// make sure there is an array
var exprType = Expression.GetExpressionType(emitter);
if (!exprType.Contains("[]"))
Error(Resources.errSplatArrayExpected);
// define required variables
var type = emitter.GetArrayItemType(exprType);
var typeRef = emitter.ResolveType(type);
var idx = 0;
var tmpVar = emitter.CurrentMethod.Scope.Introduce(exprType, emitter.ResolveType(exprType));
// compile array
Expression.Compile(emitter);
emitter.EmitSaveVariable(tmpVar);
foreach(var curr in Names)
{
// check for variable redefinition
if (emitter.CurrentMethod.Scope.Exists(curr.Data))
Error(String.Format(Resources.errVariableRedefinition, curr.Data), curr);
var varDecl = emitter.CurrentMethod.Scope.Introduce(type, emitter.ResolveType(type), curr.Data);
var elseLabel = emitter.CreateLabel();
var endLabel = emitter.CreateLabel();
// make sure the array is not a null
emitter.EmitLoadNull();
emitter.EmitLoadVariable(tmpVar);
emitter.EmitCompareEqual();
emitter.EmitBranchTrue(elseLabel);
// make sure there are items in the array
emitter.EmitLoadInt(idx);
emitter.EmitLoadVariable(tmpVar);
emitter.EmitLoadArraySize();
emitter.EmitCompareLess();
emitter.EmitBranchFalse(elseLabel);
// retrieve the current value
emitter.EmitLoadVariable(tmpVar);
emitter.EmitLoadInt(idx);
if(type == "complex")
{
emitter.EmitLoadIndexAddress(typeRef);
emitter.EmitLoadObject(typeRef);
}
else
emitter.EmitLoadIndex(type);
emitter.EmitBranch(endLabel);
// or create a default
emitter.PlaceLabel(elseLabel);
emitter.EmitLoadDefaultValue(type);
// assign the variable
emitter.PlaceLabel(endLabel);
emitter.EmitSaveVariable(varDecl);
idx++;
}
}
/// <summary>
/// Create iteration code for a range
/// </summary>
/// <param name="emitter"></param>
public void CompileRange(Emitter.Emitter emitter)
{
// make local variables only visible inside the scope
emitter.CurrentMethod.Scope.EnterSubScope();
var idxVar = emitter.CurrentMethod.Scope.Introduce("int", emitter.ResolveType("int"), Key == null ? null : Key.Data);
var rangeVar = emitter.CurrentMethod.Scope.Introduce("range", emitter.ResolveType("range"));
var currVar = emitter.CurrentMethod.Scope.Introduce("int", emitter.ResolveType("int"), Item.Data);
// preface: range = ..., range.reset
Iterable.Compile(emitter);
emitter.EmitSaveVariable(rangeVar);
emitter.EmitLoadVariable(rangeVar);
emitter.EmitCall(emitter.FindMethod("range", "reset"));
// set key if exists
if(Key != null)
{
emitter.EmitLoadInt(-1);
emitter.EmitSaveVariable(idxVar);
}
// range.next == false ? exit
emitter.PlaceLabel(BodyStart);
emitter.EmitLoadVariable(rangeVar);
emitter.EmitCall(emitter.FindMethod("range", "next"));
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual();
emitter.EmitBranchTrue(BodyEnd);
// curr = range.current
emitter.EmitLoadVariable(rangeVar);
emitter.EmitCall(emitter.FindMethod("range", "current"));
emitter.EmitSaveVariable(currVar);
// increment key if exists
if(Key != null)
{
emitter.EmitLoadVariable(idxVar);
emitter.EmitLoadInt(1);
emitter.EmitAdd();
emitter.EmitSaveVariable(idxVar);
}
// body
var preCurrLoop = emitter.CurrentLoop;
emitter.CurrentLoop = this;
Body.Compile(emitter);
emitter.CurrentLoop = preCurrLoop;
emitter.EmitBranch(BodyStart);
emitter.PlaceLabel(BodyEnd);
emitter.CurrentMethod.Scope.LeaveSubScope();
}
/// <summary>
/// Create iteration code for a dictionary
/// </summary>
/// <param name="emitter"></param>
public void CompileDict(Emitter.Emitter emitter)
{
// check if key defined
if (Key == null)
Error(Resources.errDictIterKeyRequired);
// make local variables only visible inside the scope
emitter.CurrentMethod.Scope.EnterSubScope();
var dictVar = emitter.CurrentMethod.Scope.Introduce("dict", emitter.ResolveType("dict"));
var currVar = emitter.CurrentMethod.Scope.Introduce("string[]", emitter.ResolveType("string[]"));
var keyVar = emitter.CurrentMethod.Scope.Introduce("string", emitter.ResolveType("string"), Key.Data);
var itemVar = emitter.CurrentMethod.Scope.Introduce("string", emitter.ResolveType("string"), Item.Data);
// preface: dictVar = ...;
Iterable.Compile(emitter);
emitter.EmitSaveVariable(dictVar);
emitter.EmitLoadVariable(dictVar);
emitter.EmitCall(emitter.FindMethod("dict", "reset"));
// dict.next == false ? exit
emitter.PlaceLabel(BodyStart);
emitter.EmitLoadVariable(dictVar);
emitter.EmitCall(emitter.FindMethod("dict", "next"));
emitter.EmitLoadBool(false);
emitter.EmitCompareEqual();
emitter.EmitBranchTrue(BodyEnd);
// curr = dict.current
emitter.EmitLoadVariable(dictVar);
emitter.EmitCall(emitter.FindMethod("dict", "current"));
emitter.EmitSaveVariable(currVar);
// (key, value) = curr
emitter.EmitLoadVariable(currVar);
emitter.EmitLoadInt(0);
emitter.EmitLoadIndex("string");
emitter.EmitSaveVariable(keyVar);
emitter.EmitLoadVariable(currVar);
emitter.EmitLoadInt(1);
emitter.EmitLoadIndex("string");
emitter.EmitSaveVariable(itemVar);
// body
var preCurrLoop = emitter.CurrentLoop;
emitter.CurrentLoop = this;
Body.Compile(emitter);
emitter.CurrentLoop = preCurrLoop;
emitter.EmitBranch(BodyStart);
emitter.PlaceLabel(BodyEnd);
emitter.CurrentMethod.Scope.LeaveSubScope();
}