public SwitchPictureBox()
{
this.BackColor = Color.LightPink;
SwitchValue = SwitchMethod.随机;
}
/// <summary>
/// Emits local variable switch and performs a specified operation on each case.
/// </summary>
/// <param name="codeGenerator">The code generator.</param>
/// <param name="method">The operation performed in each case.</param>
internal void EmitSwitch(CodeGenerator codeGenerator, SwitchMethod method)
{
ILEmitter il = codeGenerator.IL;
Debug.Assert(method != null);
Label default_case = il.DefineLabel();
Label end_label = il.DefineLabel();
LocalBuilder ivar_local = il.GetTemporaryLocal(Types.String[0], true);
LocalBuilder non_interned_local = il.DeclareLocal(Types.String[0]);
VariablesTable variables = codeGenerator.CurrentVariablesTable;
Label[] labels = new Label[variables.Count];
// non_interned_local = <name expression>;
EmitName(codeGenerator);
il.Stloc(non_interned_local);
// ivar_local = String.IsInterned(non_interned_local)
il.Ldloc(non_interned_local);
il.Emit(OpCodes.Call, Methods.String_IsInterned);
il.Stloc(ivar_local);
// switch for every compile-time variable:
int i = 0;
foreach (VariablesTable.Entry variable in variables)
{
labels[i] = il.DefineLabel();
// IF (ivar_local == <i-th variable name>) GOTO labels[i];
il.Ldloc(ivar_local);
il.Emit(OpCodes.Ldstr, variable.VariableName.ToString());
il.Emit(OpCodes.Beq, labels[i]);
i++;
}
// GOTO default_case:
il.Emit(OpCodes.Br, default_case);
// operation on each variable:
i = 0;
foreach (VariablesTable.Entry variable in variables)
{
// labels[i]:
il.MarkLabel(labels[i]);
// operation:
method(codeGenerator, variable, null);
// GOTO end;
il.Emit(OpCodes.Br, end_label);
i++;
}
// default case - new variable created at runtime:
il.MarkLabel(default_case);
method(codeGenerator, null, non_interned_local);
// END:
il.MarkLabel(end_label);
}
/// <summary>
/// Emits local variable switch and performs a specified operation on each case.
/// </summary>
/// <param name="codeGenerator">The code generator.</param>
/// <param name="method">The operation performed in each case.</param>
internal void EmitSwitch(CodeGenerator codeGenerator, SwitchMethod method)
{
ILEmitter il = codeGenerator.IL;
Debug.Assert(method != null);
Label default_case = il.DefineLabel();
Label end_label = il.DefineLabel();
LocalBuilder ivar_local = il.GetTemporaryLocal(Types.String[0], true);
LocalBuilder non_interned_local = il.DeclareLocal(Types.String[0]);
VariablesTable variables = codeGenerator.CurrentVariablesTable;
Label[] labels = new Label[variables.Count];
// non_interned_local = <name expression>;
EmitName(codeGenerator);
il.Stloc(non_interned_local);
// ivar_local = String.IsInterned(non_interned_local)
il.Ldloc(non_interned_local);
il.Emit(OpCodes.Call, Methods.String_IsInterned);
il.Stloc(ivar_local);
// switch for every compile-time variable:
int i = 0;
foreach (VariablesTable.Entry variable in variables)
{
labels[i] = il.DefineLabel();
// IF (ivar_local == <i-th variable name>) GOTO labels[i];
il.Ldloc(ivar_local);
il.Emit(OpCodes.Ldstr, variable.VariableName.ToString());
il.Emit(OpCodes.Beq, labels[i]);
i++;
}
// GOTO default_case:
il.Emit(OpCodes.Br, default_case);
// operation on each variable:
i = 0;
foreach (VariablesTable.Entry variable in variables)
{
// labels[i]:
il.MarkLabel(labels[i]);
// operation:
method(codeGenerator, variable, null);
// GOTO end;
il.Emit(OpCodes.Br, end_label);
i++;
}
// default case - new variable created at runtime:
il.MarkLabel(default_case);
method(codeGenerator, null, non_interned_local);
// END:
il.MarkLabel(end_label);
}
