public static void Run(DecompilerContext context, ILBlock method)
{
if (!context.Settings.YieldReturn)
return; // abort if enumerator decompilation is disabled
var yrd = new YieldReturnDecompiler();
yrd.context = context;
if (!yrd.MatchEnumeratorCreationPattern(method))
return;
yrd.enumeratorType = yrd.enumeratorCtor.DeclaringType;
#if DEBUG
if (Debugger.IsAttached) {
yrd.Run();
} else {
#endif
try {
yrd.Run();
} catch (YieldAnalysisFailedException) {
return;
}
#if DEBUG
}
#endif
method.Body.Clear();
method.EntryGoto = null;
method.Body.AddRange(yrd.newBody);
// Repeat the inlining/copy propagation optimization because the conversion of field access
// to local variables can open up additional inlining possibilities.
ILInlining inlining = new ILInlining(method);
inlining.InlineAllVariables();
inlining.CopyPropagation();
}
public static void Run(DecompilerContext context, ILBlock method)
{
if (!context.Settings.YieldReturn)
{
return; // abort if enumerator decompilation is disabled
}
var yrd = new YieldReturnDecompiler();
yrd.context = context;
if (!yrd.MatchEnumeratorCreationPattern(method))
{
return;
}
yrd.enumeratorType = yrd.enumeratorCtor.DeclaringType;
#if DEBUG
if (Debugger.IsAttached)
{
yrd.Run();
}
else
{
#endif
try {
yrd.Run();
} catch (YieldAnalysisFailedException) {
return;
}
#if DEBUG
}
#endif
method.Body.Clear();
method.EntryGoto = null;
method.Body.AddRange(yrd.newBody);
// Repeat the inlining/copy propagation optimization because the conversion of field access
// to local variables can open up additional inlining possibilities.
ILInlining inlining = new ILInlining(method);
inlining.InlineAllVariables();
inlining.CopyPropagation();
}
public void Optimize(DecompilerContext context, ILBlock method, ILAstOptimizationStep abortBeforeStep = ILAstOptimizationStep.None)
{
this.context = context;
this.typeSystem = context.CurrentMethod.Module.TypeSystem;
this.method = method;
if (abortBeforeStep == ILAstOptimizationStep.RemoveRedundantCode)
{
return;
}
RemoveRedundantCode(method);
if (abortBeforeStep == ILAstOptimizationStep.ReduceBranchInstructionSet)
{
return;
}
foreach (ILBlock block in method.GetSelfAndChildrenRecursive().OfType <ILBlock>())
{
ReduceBranchInstructionSet(block);
}
// ReduceBranchInstructionSet runs before inlining because the non-aggressive inlining heuristic
// looks at which type of instruction consumes the inlined variable.
if (abortBeforeStep == ILAstOptimizationStep.InlineVariables)
{
return;
}
// Works better after simple goto removal because of the following debug pattern: stloc X; br Next; Next:; ldloc X
ILInlining inlining1 = new ILInlining(method);
inlining1.InlineAllVariables();
if (abortBeforeStep == ILAstOptimizationStep.CopyPropagation)
{
return;
}
inlining1.CopyPropagation();
if (abortBeforeStep == ILAstOptimizationStep.YieldReturn)
{
return;
}
YieldReturnDecompiler.Run(context, method);
if (abortBeforeStep == ILAstOptimizationStep.PropertyAccessInstructions)
{
return;
}
IntroducePropertyAccessInstructions(method);
if (abortBeforeStep == ILAstOptimizationStep.SplitToMovableBlocks)
{
return;
}
foreach (ILBlock block in method.EnumerateSelfAndChildrenRecursive().OfType <ILBlock>())
{
SplitToBasicBlocks(block);
}
if (abortBeforeStep == ILAstOptimizationStep.TypeInference)
{
return;
}
// Types are needed for the ternary operator optimization
TypeAnalysis.Run(context, method);
var controlFlow = new SimpleControlFlow(context, method);
foreach (ILBlock block in method.GetSelfAndChildrenRecursive().OfType <ILBlock>())
{
bool modified;
do
{
modified = false;
if (abortBeforeStep == ILAstOptimizationStep.SimplifyShortCircuit)
{
return;
}
modified |= block.RunOptimization(controlFlow.SimplifyShortCircuit);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyTernaryOperator)
{
return;
}
modified |= block.RunOptimization(controlFlow.SimplifyTernaryOperator);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyNullCoalescing)
{
return;
}
modified |= block.RunOptimization(controlFlow.SimplifyNullCoalescing);
if (abortBeforeStep == ILAstOptimizationStep.JoinBasicBlocks)
{
return;
}
modified |= block.RunOptimization(new SimpleControlFlow(context, method).JoinBasicBlocks);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyShiftOperators)
{
return;
}
modified |= block.RunOptimization(SimplifyShiftOperators);
if (abortBeforeStep == ILAstOptimizationStep.TransformDecimalCtorToConstant)
{
return;
}
modified |= block.RunOptimization(TransformDecimalCtorToConstant);
modified |= block.RunOptimization(SimplifyLdcI4ConvI8);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyLdObjAndStObj)
{
return;
}
modified |= block.RunOptimization(SimplifyLdObjAndStObj);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyCustomShortCircuit)
{
return;
}
modified |= block.RunOptimization(controlFlow.SimplifyCustomShortCircuit);
if (abortBeforeStep == ILAstOptimizationStep.TransformArrayInitializers)
{
return;
}
modified |= block.RunOptimization(TransformArrayInitializers);
if (abortBeforeStep == ILAstOptimizationStep.TransformMultidimensionalArrayInitializers)
{
return;
}
modified |= block.RunOptimization(TransformMultidimensionalArrayInitializers);
if (abortBeforeStep == ILAstOptimizationStep.TransformObjectInitializers)
{
return;
}
modified |= block.RunOptimization(TransformObjectInitializers);
if (abortBeforeStep == ILAstOptimizationStep.MakeAssignmentExpression)
{
return;
}
modified |= block.RunOptimization(MakeAssignmentExpression);
modified |= block.RunOptimization(MakeCompoundAssignments);
if (abortBeforeStep == ILAstOptimizationStep.IntroducePostIncrement)
{
return;
}
modified |= block.RunOptimization(IntroducePostIncrement);
if (abortBeforeStep == ILAstOptimizationStep.InlineVariables2)
{
return;
}
modified |= new ILInlining(method).InlineAllInBlock(block);
new ILInlining(method).CopyPropagation();
} while(modified);
}
if (abortBeforeStep == ILAstOptimizationStep.FindLoops)
{
return;
}
foreach (ILBlock block in method.GetSelfAndChildrenRecursive().OfType <ILBlock>())
{
new LoopsAndConditions(context).FindLoops(block);
}
if (abortBeforeStep == ILAstOptimizationStep.FindConditions)
{
return;
}
foreach (ILBlock block in method.GetSelfAndChildrenRecursive().OfType <ILBlock>())
{
new LoopsAndConditions(context).FindConditions(block);
}
if (abortBeforeStep == ILAstOptimizationStep.FlattenNestedMovableBlocks)
{
return;
}
FlattenBasicBlocks(method);
if (abortBeforeStep == ILAstOptimizationStep.RemoveEndFinally)
{
return;
}
RemoveEndFinally(method);
if (abortBeforeStep == ILAstOptimizationStep.RemoveRedundantCode2)
{
return;
}
RemoveRedundantCode(method);
if (abortBeforeStep == ILAstOptimizationStep.GotoRemoval)
{
return;
}
new GotoRemoval().RemoveGotos(method);
if (abortBeforeStep == ILAstOptimizationStep.DuplicateReturns)
{
return;
}
DuplicateReturnStatements(method);
if (abortBeforeStep == ILAstOptimizationStep.GotoRemoval2)
{
return;
}
new GotoRemoval().RemoveGotos(method);
if (abortBeforeStep == ILAstOptimizationStep.ReduceIfNesting)
{
return;
}
ReduceIfNesting(method);
if (abortBeforeStep == ILAstOptimizationStep.InlineVariables3)
{
return;
}
// The 2nd inlining pass is necessary because DuplicateReturns and the introduction of ternary operators
// open up additional inlining possibilities.
new ILInlining(method).InlineAllVariables();
if (abortBeforeStep == ILAstOptimizationStep.CachedDelegateInitialization)
{
return;
}
foreach (ILBlock block in method.GetSelfAndChildrenRecursive().OfType <ILBlock>())
{
for (int i = 0; i < block.Body.Count; i++)
{
// TODO: Move before loops
CachedDelegateInitializationWithField(block, ref i);
CachedDelegateInitializationWithLocal(block, ref i);
}
}
if (abortBeforeStep == ILAstOptimizationStep.IntroduceFixedStatements)
{
return;
}
// we need post-order traversal, not pre-order, for "fixed" to work correctly
foreach (ILBlock block in TreeTraversal.PostOrder <ILNode>(method, n => n.GetChildren()).OfType <ILBlock>())
{
for (int i = block.Body.Count - 1; i >= 0; i--)
{
// TODO: Move before loops
if (i < block.Body.Count)
{
IntroduceFixedStatements(block.Body, i);
}
}
}
if (abortBeforeStep == ILAstOptimizationStep.RecombineVariables)
{
return;
}
RecombineVariables(method);
if (abortBeforeStep == ILAstOptimizationStep.TypeInference2)
{
return;
}
TypeAnalysis.Reset(method);
TypeAnalysis.Run(context, method);
if (abortBeforeStep == ILAstOptimizationStep.RemoveRedundantCode3)
{
return;
}
GotoRemoval.RemoveRedundantCode(method);
// ReportUnassignedILRanges(method);
}