public override PhpTypeCode Emit(IssetEx node, CodeGenerator codeGenerator)
{
Debug.Assert(access == AccessType.None || access == AccessType.Read);
Statistics.AST.AddNode("IssetEx");
ILEmitter il = codeGenerator.IL;
codeGenerator.ChainBuilder.Create();
codeGenerator.ChainBuilder.QuietRead = true;
var vars = node.VarList;
if (vars.Count == 1)
{
codeGenerator.EmitBoxing(VariableUseHelper.EmitIsset(vars[0], codeGenerator, false));
// Compare the result with "null"
il.CmpNotNull();
}
else
{
// Define labels
Label f_label = il.DefineLabel();
Label x_label = il.DefineLabel();
// Get first variable
codeGenerator.EmitBoxing(VariableUseHelper.EmitIsset(vars[0], codeGenerator, false));
// Compare the result with "null"
il.CmpNotNull();
// Process following variables and include branching
for (int i = 1; i < vars.Count; i++)
{
il.Emit(OpCodes.Brfalse, f_label);
codeGenerator.EmitBoxing(VariableUseHelper.EmitIsset(vars[i], codeGenerator, false));
// Compare the result with "null"
codeGenerator.IL.CmpNotNull();
}
il.Emit(OpCodes.Br, x_label);
il.MarkLabel(f_label, true);
il.Emit(OpCodes.Ldc_I4_0);
il.MarkLabel(x_label, true);
}
codeGenerator.ChainBuilder.End();
if (access == AccessType.None)
{
il.Emit(OpCodes.Pop);
return(PhpTypeCode.Void);
}
return(PhpTypeCode.Boolean);
}