C# ILGenerator.Switch方法代码示例

//.........这里部分代码省略.........
            if (this.FinallyBlock != null)
                generator.BeginExceptionBlock();

            // Begin the exception block.
            generator.BeginExceptionBlock();

            // Generate code for the try block.
            this.TryBlock.GenerateCode(generator, optimizationInfo);

            // Generate code for the catch block.
            if (this.CatchBlock != null)
            {
                // Begin a catch block.  The exception is on the top of the stack.
                generator.BeginCatchBlock(typeof(JavaScriptException));

                // Create a new DeclarativeScope.
                this.CatchScope.GenerateScopeCreation(generator, optimizationInfo);

                // Store the error object in the variable provided.
                generator.Call(ReflectionHelpers.JavaScriptException_ErrorObject);
                var catchVariable = new NameExpression(this.CatchScope, this.CatchVariableName);
                catchVariable.GenerateSet(generator, optimizationInfo, PrimitiveType.Any, false);

                // Make sure the scope is reverted even if an exception is thrown.
                generator.BeginExceptionBlock();

                // Emit code for the statements within the catch block.
                this.CatchBlock.GenerateCode(generator, optimizationInfo);

                // Revert the scope.
                generator.BeginFinallyBlock();
                this.CatchScope.GenerateScopeDestruction(generator, optimizationInfo);
                generator.EndExceptionBlock();
            }

            // Generate code for the finally block.
            if (this.FinallyBlock != null)
            {
                generator.BeginFinallyBlock();

                var branches = new List<ILLabel>();
                var previousStackSize = optimizationInfo.LongJumpStackSizeThreshold;
                optimizationInfo.LongJumpStackSizeThreshold = optimizationInfo.BreakOrContinueStackSize;
                var previousCallback = optimizationInfo.LongJumpCallback;
                optimizationInfo.LongJumpCallback = (generator2, label) =>
                    {
                        // It is not possible to branch out of a finally block - therefore instead of
                        // generating LEAVE instructions we throw an exception then catch it to transfer
                        // control out of the finally block.
                        generator2.LoadInt32(branches.Count);
                        generator2.NewObject(ReflectionHelpers.LongJumpException_Constructor);
                        generator2.Throw();

                        // Record any branches that are made within the finally code.
                        branches.Add(label);
                    };

                // Emit code for the finally block.
                this.FinallyBlock.GenerateCode(generator, optimizationInfo);

                // End the main exception block.
                generator.EndExceptionBlock();

                // Begin a catch block to catch any LongJumpExceptions. The exception object is on
                // the top of the stack.
                generator.BeginCatchBlock(typeof(LongJumpException));

                if (branches.Count > 0)
                {
                    // switch (exception.RouteID)
                    // {
                    //    case 0: goto label1;
                    //    case 1: goto label2;
                    // }
                    ILLabel[] switchLabels = new ILLabel[branches.Count];
                    for (int i = 0; i < branches.Count; i++)
                        switchLabels[i] = generator.CreateLabel();
                    generator.Call(ReflectionHelpers.LongJumpException_RouteID);
                    generator.Switch(switchLabels);
                    for (int i = 0; i < branches.Count; i++)
                    {
                        generator.DefineLabelPosition(switchLabels[i]);
                        generator.Leave(branches[i]);
                    }
                }

                // Reset the state we clobbered.
                optimizationInfo.LongJumpStackSizeThreshold = previousStackSize;
                optimizationInfo.LongJumpCallback = previousCallback;
            }

            // End the exception block.
            generator.EndExceptionBlock();

            // Reset the InsideTryCatchOrFinally flag.
            optimizationInfo.InsideTryCatchOrFinally = previousInsideTryCatchOrFinally;

            // Generate code for the end of the statement.
            GenerateEndOfStatement(generator, optimizationInfo, statementLocals);
        }