public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the previous root - we'll be changing it:
Expression prevRoot = optimizationInfo.RootExpression;
// Labelled is now the root:
Labelled.SetRoot(optimizationInfo);
if (Labelled.DefaultBreakStatementBehaviour)
{
// Set up the information needed by the break statement.
ILLabel endOfStatement = generator.CreateLabel();
optimizationInfo.PushBreakOrContinueInfo(labels, endOfStatement, null, true);
Labelled.GenerateCode(generator, optimizationInfo);
// Revert the information needed by the break statement.
generator.DefineLabelPosition(endOfStatement);
optimizationInfo.PopBreakOrContinueInfo();
}
else
{
// Loop, For-In, For-Of or Switch only.
optimizationInfo.Labels = labels;
Labelled.GenerateCode(generator, optimizationInfo);
}
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the previous root - we'll be changing it:
Expression prevRoot = optimizationInfo.RootExpression;
// Set as root:
Body.SetRoot(optimizationInfo);
// Generate code for the body statements.
Body.GenerateCode(generator, optimizationInfo);
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Parent root:
Expression rootExpression = optimizationInfo.RootExpression;
int max = Statements.Count;
for (int i = 0; i < max; i++)
{
// Generate code for the statement.
Statement statement = Statements[i];
// Apply the root:
statement.SetRoot(optimizationInfo);
// Generate the code:
statement.GenerateCode(generator, optimizationInfo);
}
// Restore root:
optimizationInfo.RootExpression = rootExpression;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the previous root - we'll be changing it:
Expression prevRoot = optimizationInfo.RootExpression;
// Unlike in .NET, in javascript there are no restrictions on what can appear inside
// try, catch and finally blocks. The one restriction which causes problems is the
// inability to jump out of .NET finally blocks. This is required when break, continue
// or return statements appear inside of a finally block. To work around this, when
// inside a finally block these instructions throw an exception instead.
// Setting the InsideTryCatchOrFinally flag converts BR instructions into LEAVE
// instructions so that the finally block is executed correctly.
var previousInsideTryCatchOrFinally = optimizationInfo.InsideTryCatchOrFinally;
optimizationInfo.InsideTryCatchOrFinally = true;
// Finally requires two exception nested blocks.
if (this.FinallyBlock != null)
{
generator.BeginExceptionBlock();
}
// Begin the exception block.
generator.BeginExceptionBlock();
// Generate code for the try block. It's now the root.
TryBlock.SetRoot(optimizationInfo);
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(Exception));
var catchVariable = new NameExpression(this.CatchScope, this.CatchVariableName);
catchVariable.ApplyType(optimizationInfo, typeof(Exception));
catchVariable.GenerateSet(generator, optimizationInfo, false, typeof(Exception), delegate(bool two){
// Note that we always do nothing here. The value is already on the stack.
}, false);
// Emit code for the statements within the catch block. It's now the root.
CatchBlock.SetRoot(optimizationInfo);
CatchBlock.GenerateCode(generator, optimizationInfo);
}
// 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 = delegate(ILGenerator generator2, ILLabel 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. It's now the root.
FinallyBlock.SetRoot(optimizationInfo);
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.LoadField(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;
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the previous root - we'll be changing it:
Expression prevRoot = optimizationInfo.RootExpression;
List <string> labels = optimizationInfo.Labels;
optimizationInfo.Labels = null;
// Construct a loop expression.
// var enumerator = TypeUtilities.EnumeratePropertyNames(rhs).GetEnumerator();
// while (true) {
// continue-target:
// if (enumerator.MoveNext() == false)
// goto break-target;
// lhs = enumerator.Current;
//
// <body statements>
// }
// break-target:
// Call IEnumerable<string> EnumeratePropertyNames(ScriptEngine engine, object obj)
// optimizationInfo.MarkSequencePoint(generator, this.TargetObjectSourceSpan);
EmitHelpers.LoadEngine(generator);
this.TargetObject.GenerateCode(generator, optimizationInfo);
EmitConversion.ToAny(generator, this.TargetObject.GetResultType(optimizationInfo));
generator.Call(ReflectionHelpers.TypeUtilities_EnumeratePropertyNames);
// Store the enumerator in a temporary variable.
var enumerator = generator.CreateTemporaryVariable(typeof(IEnumerator <string>));
generator.StoreVariable(enumerator);
var breakTarget = generator.CreateLabel();
var continueTarget = generator.DefineLabelPosition();
// Emit debugging information.
// if (optimizationInfo.DebugDocument != null)
// generator.MarkSequencePoint(optimizationInfo.DebugDocument, this.VariableSourceSpan);
// if (enumerator.MoveNext() == false)
// goto break-target;
generator.LoadVariable(enumerator);
generator.Call(ReflectionHelpers.IEnumerator_MoveNext);
generator.BranchIfFalse(breakTarget);
// lhs = enumerator.Current;
this.Variable.GenerateSet(generator, optimizationInfo, false, typeof(string), delegate(bool two){
generator.LoadVariable(enumerator);
generator.Call(ReflectionHelpers.IEnumerator_Current);
if (two)
{
generator.Duplicate();
}
}, false);
// Emit the body statement(s).
optimizationInfo.PushBreakOrContinueInfo(labels, breakTarget, continueTarget, false);
// Mark the body as root:
Body.SetRoot(optimizationInfo);
Body.GenerateCode(generator, optimizationInfo);
optimizationInfo.PopBreakOrContinueInfo();
generator.Branch(continueTarget);
generator.DefineLabelPosition(breakTarget);
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the root:
Expression prevRoot = optimizationInfo.RootExpression;
// Is the condition constant?
if (StaticResult != null)
{
// We have a compile-time constant (i.e. if(true) )
// Convert it to a bool:
bool result = TypeConverter.ToBoolean(StaticResult);
if (result)
{
// if(true)
// Generate code for the if clause which is now the root:
IfClause.SetRoot(optimizationInfo);
IfClause.GenerateCode(generator, optimizationInfo);
}
else
{
// if(false)
if (ElseClause != null)
{
// It's now the root:
ElseClause.SetRoot(optimizationInfo);
// Code for the else clause:
ElseClause.GenerateCode(generator, optimizationInfo);
}
}
// Restore root:
optimizationInfo.RootExpression = prevRoot;
return;
}
// Generate code for the condition and coerce to a boolean.
this.Condition.GenerateCode(generator, optimizationInfo);
EmitConversion.ToBool(generator, this.Condition.GetResultType(optimizationInfo));
// We will need a label at the end of the if statement.
var endOfEverything = generator.CreateLabel();
if (this.ElseClause == null)
{
// Jump to the end if the condition is false.
generator.BranchIfFalse(endOfEverything);
// If clause is now the root:
IfClause.SetRoot(optimizationInfo);
// Generate code for the if clause.
IfClause.GenerateCode(generator, optimizationInfo);
}
else
{
// Branch to the else clause if the condition is false.
var startOfElseClause = generator.CreateLabel();
generator.BranchIfFalse(startOfElseClause);
// If clause is now the root:
IfClause.SetRoot(optimizationInfo);
// Generate code for the if clause.
IfClause.GenerateCode(generator, optimizationInfo);
// Branch to the end of the if statement.
generator.Branch(endOfEverything);
// Else clause is now the root:
ElseClause.SetRoot(optimizationInfo);
// Generate code for the else clause.
generator.DefineLabelPosition(startOfElseClause);
ElseClause.GenerateCode(generator, optimizationInfo);
}
// Define the label at the end of the if statement.
generator.DefineLabelPosition(endOfEverything);
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
/// <summary>
/// Generates CIL for the statement.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Get the previous root - we'll be changing it:
Expression prevRoot = optimizationInfo.RootExpression;
List <string> labels = optimizationInfo.Labels;
optimizationInfo.Labels = null;
// Emit the initialization statement.
if (InitStatement != null)
{
// Init isn't in use. Mark it as root:
InitStatement.SetRoot(optimizationInfo);
InitStatement.GenerateCode(generator, optimizationInfo);
// Restore root:
optimizationInfo.RootExpression = prevRoot;
}
var startOfLoop = generator.DefineLabelPosition();
var continueTarget = generator.CreateLabel();
var endOfLoop = generator.CreateLabel();
bool conditionAtEnd = CheckConditionAtEnd;
// AT END..
// top:
// <body statements>
// continue:
// <increment>
// if(condition)
// <goto top>
// break:
// top:
// if(!condition)
// <goto break>
// <body statements>
// continue:
// <increment>
// <goto top>
// break:
if (!conditionAtEnd)
{
if (ConditionStatement != null)
{
Condition.GenerateCode(generator, optimizationInfo);
EmitConversion.ToBool(generator, Condition.GetResultType(optimizationInfo));
generator.BranchIfFalse(endOfLoop);
}
}
// Emit the loop body.
optimizationInfo.PushBreakOrContinueInfo(labels, endOfLoop, continueTarget, false);
// Mark the body as root:
Body.SetRoot(optimizationInfo);
Body.GenerateCode(generator, optimizationInfo);
optimizationInfo.PopBreakOrContinueInfo();
generator.DefineLabelPosition(continueTarget);
// Increment the loop variable.
if (IncrementStatement != null)
{
// Increment isn't in use. Mark it as root:
IncrementStatement.SetRoot(optimizationInfo);
IncrementStatement.GenerateCode(generator, optimizationInfo);
}
// Restore root:
optimizationInfo.RootExpression = prevRoot;
if (conditionAtEnd)
{
if (ConditionStatement != null)
{
// Emit now:
Condition.GenerateCode(generator, optimizationInfo);
EmitConversion.ToBool(generator, Condition.GetResultType(optimizationInfo));
generator.BranchIfTrue(startOfLoop);
}
}
else
{
generator.Branch(startOfLoop);
}
generator.DefineLabelPosition(endOfLoop);
}
