protected override void DoGenerate(CilEmitter emitter)
{
ILabel comparisonLabel = emitter.GenerateLabel();
ILabel contentsLabel = emitter.GenerateLabel();
variable = emitter.EmitLocalVarDeclaration("STEPS_LOOP_VAR" + stepCountExpr.lexline + "_" + stepCountExpr.lexline, typeof(int));
stepCountExpr.EmitRValue(emitter);
variable.EmitAssignment();
comparisonLabel.Emit();
variable.EmitValue();
emitter.EmitInt32(0);
emitter.EmitComparison(">");
after.EmitJumpIfFalse();
contentsLabel.Emit();
statement.Generate(emitter, contentsLabel, comparisonLabel);
variable.EmitValue();
emitter.EmitInt32(1);
emitter.EmitBinaryOperator("-");
variable.EmitAssignment();
comparisonLabel.EmitJump();
/*
*
* logicalExpression.jumping(0, after)
*
* create label
*
* emit label
*
* stmt.Gen(label, begin)
*
* emit goto begin
*
*/
}
// a * 3 + b * 2 - c
private void TestComplexExpression()
{
// Initialize variables a, b and c
// a = 5
ILocalVariable aVar = emitter.EmitLocalVarDeclaration("A", typeof(int));
emitter.EmitInt32(5);
aVar.EmitAssignment();
// b = 6
ILocalVariable bVar = emitter.EmitLocalVarDeclaration("B", typeof(int));
emitter.EmitInt32(6);
bVar.EmitAssignment();
// c = 7
ILocalVariable cVar = emitter.EmitLocalVarDeclaration("B", typeof(int));
emitter.EmitInt32(7);
cVar.EmitAssignment();
// Emit lhs R Value
aVar.EmitValue();
emitter.EmitInt32(3);
emitter.EmitBinaryOperator("*");
// Emit rhs R Value
bVar.EmitValue();
emitter.EmitInt32(2);
emitter.EmitBinaryOperator("*");
emitter.EmitBinaryOperator("+");
cVar.EmitValue();
emitter.EmitBinaryOperator("-");
emitter.EmitWrite(typeof(int));
}
