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@ -21,43 +21,49 @@ using System.Diagnostics;
@@ -21,43 +21,49 @@ using System.Diagnostics;
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using System.Linq; |
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using ICSharpCode.Decompiler.TypeSystem; |
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using ICSharpCode.Decompiler.TypeSystem.Implementation; |
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using ICSharpCode.Decompiler.Util; |
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namespace ICSharpCode.Decompiler.IL.Transforms |
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{ |
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/// <summary>
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/// Constructs compound assignments and inline assignments.
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/// </summary>
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public class TransformAssignment : IBlockTransform |
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public class TransformAssignment : IStatementTransform |
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{ |
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BlockTransformContext context; |
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StatementTransformContext context; |
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void IBlockTransform.Run(Block block, BlockTransformContext context) |
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void IStatementTransform.Run(Block block, int pos, StatementTransformContext context) |
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{ |
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this.context = context; |
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for (int i = block.Instructions.Count - 1; i >= 0; i--) { |
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if (TransformPostIncDecOperatorOnAddress(block, i) || TransformPostIncDecOnStaticField(block, i) || TransformCSharp4PostIncDecOperatorOnAddress(block, i)) { |
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block.Instructions.RemoveAt(i); |
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continue; |
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} |
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if (TransformPostIncDecOperator(block, i)) { |
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block.Instructions.RemoveAt(i); |
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continue; |
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} |
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if (TransformInlineAssignmentStObj(block, i) || TransformInlineAssignmentLocal(block, i)) |
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continue; |
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if (TransformInlineCompoundAssignmentCall(block, i)) |
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continue; |
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if (TransformRoslynCompoundAssignmentCall(block, i)) |
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continue; |
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if (TransformRoslynPostIncDecOperatorOnAddress(block, i)) |
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continue; |
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/*if (TransformPostIncDecOperatorOnAddress(block, i) || TransformPostIncDecOnStaticField(block, i) || TransformCSharp4PostIncDecOperatorOnAddress(block, i)) { |
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block.Instructions.RemoveAt(i); |
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continue; |
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} |
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if (TransformPostIncDecOperator(block, i)) { |
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block.Instructions.RemoveAt(i); |
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continue; |
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}*/ |
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if (TransformInlineAssignmentStObjOrCall(block, pos) || TransformInlineAssignmentLocal(block, pos)) { |
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// both inline assignments create a top-level stloc which might affect inlining
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context.RequestRerun(); |
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return; |
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} |
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/* |
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TransformInlineCompoundAssignmentCall(block, pos); |
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TransformRoslynCompoundAssignmentCall(block, pos); |
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// TODO: post-increment on local
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// post-increment on address (e.g. field or array element)
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TransformPostIncDecOperatorOnAddress(block, pos); |
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TransformRoslynPostIncDecOperatorOnAddress(block, pos); |
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// TODO: post-increment on call
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*/ |
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} |
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/// <code>
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/// stloc s(value)
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/// stloc l(ldloc s)
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/// stobj(..., ldloc s)
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/// where ... is pure and does not use s or l
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/// -->
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/// stloc l(stobj (..., value))
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/// </code>
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@ -72,7 +78,17 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -72,7 +78,17 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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/// stloc s(stobj (..., value))
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/// </code>
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/// e.g. used for inline assignment to static field
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bool TransformInlineAssignmentStObj(Block block, int pos) |
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///
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/// -or-
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///
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/// <code>
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/// stloc s(value)
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/// call set_Property(..., ldloc s)
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/// where the '...' arguments are free of side-effects and not using 's'
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/// -->
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/// stloc s(Block InlineAssign { call set_Property(..., stloc i(value)); final: ldloc i })
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/// </code>
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bool TransformInlineAssignmentStObjOrCall(Block block, int pos) |
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{ |
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var inst = block.Instructions[pos] as StLoc; |
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// in some cases it can be a compiler-generated local
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@ -96,22 +112,75 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -96,22 +112,75 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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localStore = null; |
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nextPos = pos + 1; |
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} |
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if (!(block.Instructions[nextPos] is StObj stobj)) |
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return false; |
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if (!stobj.Value.MatchLdLoc(inst.Variable) || inst.Variable.IsUsedWithin(stobj.Target)) |
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return false; |
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if (IsImplicitTruncation(inst.Value, stobj.Type)) { |
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// 'stloc s' is implicitly truncating the value
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if (block.Instructions[nextPos] is StObj stobj) { |
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if (!stobj.Value.MatchLdLoc(inst.Variable)) |
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return false; |
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if (!SemanticHelper.IsPure(stobj.Target.Flags) || inst.Variable.IsUsedWithin(stobj.Target)) |
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return false; |
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if (IsImplicitTruncation(inst.Value, stobj.Type)) { |
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// 'stobj' is implicitly truncating the value
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return false; |
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} |
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context.Step("Inline assignment stobj", stobj); |
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block.Instructions.Remove(localStore); |
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block.Instructions.Remove(stobj); |
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stobj.Value = inst.Value; |
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inst.ReplaceWith(new StLoc(local, stobj)); |
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return true; |
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} else if (block.Instructions[nextPos] is CallInstruction call) { |
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// call must be a setter call:
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if (!(call.OpCode == OpCode.Call || call.OpCode == OpCode.CallVirt)) |
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return false; |
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if (call.ResultType != StackType.Void || call.Arguments.Count == 0) |
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return false; |
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if (!call.Method.Equals((call.Method.AccessorOwner as IProperty)?.Setter)) |
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return false; |
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if (!call.Arguments.Last().MatchLdLoc(inst.Variable)) |
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return false; |
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foreach (var arg in call.Arguments.SkipLast(1)) { |
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if (!SemanticHelper.IsPure(arg.Flags) || inst.Variable.IsUsedWithin(arg)) |
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return false; |
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} |
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if (IsImplicitTruncation(inst.Value, call.Method.Parameters.Last().Type)) { |
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// setter call is implicitly truncating the value
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return false; |
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} |
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// stloc s(Block InlineAssign { call set_Property(..., stloc i(value)); final: ldloc i })
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context.Step("Inline assignment call", call); |
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block.Instructions.Remove(localStore); |
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block.Instructions.Remove(call); |
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var newVar = context.Function.RegisterVariable(VariableKind.StackSlot, call.Method.Parameters.Last().Type); |
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call.Arguments[call.Arguments.Count - 1] = new StLoc(newVar, inst.Value); |
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inst.ReplaceWith(new StLoc(local, new Block(BlockType.CallInlineAssign) { |
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Instructions = { call }, |
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FinalInstruction = new LdLoc(newVar) |
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})); |
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return true; |
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} else { |
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return false; |
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} |
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context.Step("Inline assignment stobj", stobj); |
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block.Instructions.Remove(localStore); |
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block.Instructions.Remove(stobj); |
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stobj.Value = inst.Value; |
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inst.ReplaceWith(new StLoc(local, stobj)); |
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return true; |
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} |
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static ILInstruction UnwrapSmallIntegerConv(ILInstruction inst, out Conv conv) |
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{ |
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conv = inst as Conv; |
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if (conv != null && conv.Kind == ConversionKind.Truncate && conv.TargetType.IsSmallIntegerType()) { |
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// for compound assignments to small integers, the compiler emits a "conv" instruction
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return conv.Argument; |
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} else { |
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return inst; |
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} |
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} |
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static bool ValidateCompoundAssign(BinaryNumericInstruction binary, Conv conv, IType targetType) |
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{ |
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if (!CompoundAssignmentInstruction.IsBinaryCompatibleWithType(binary, targetType)) |
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return false; |
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if (conv != null && !(conv.TargetType == targetType.ToPrimitiveType() && conv.CheckForOverflow == binary.CheckForOverflow)) |
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return false; // conv does not match binary operation
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return true; |
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} |
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/// <code>
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/// stloc s(binary(callvirt(getter), value))
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/// callvirt (setter, ldloc s)
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@ -125,14 +194,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -125,14 +194,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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// in some cases it can be a compiler-generated local
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if (mainStLoc == null || (mainStLoc.Variable.Kind != VariableKind.StackSlot && mainStLoc.Variable.Kind != VariableKind.Local)) |
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return false; |
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ILInstruction value = mainStLoc.Value; |
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if (value is Conv conv && conv.Kind == ConversionKind.Truncate && conv.TargetType.IsSmallIntegerType()) { |
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// for compound assignments to small integers, the compiler emits a "conv" instruction
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value = conv.Argument; |
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} else { |
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conv = null; |
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} |
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BinaryNumericInstruction binary = value as BinaryNumericInstruction; |
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BinaryNumericInstruction binary = UnwrapSmallIntegerConv(mainStLoc.Value, out var conv) as BinaryNumericInstruction; |
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ILVariable localVariable = mainStLoc.Variable; |
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if (!localVariable.IsSingleDefinition) |
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return false; |
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@ -151,10 +213,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -151,10 +213,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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if (next.Descendants.Where(d => d.MatchLdLoc(localVariable)).Count() != 1) |
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return false; |
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IType targetType = getterCall.Method.ReturnType; |
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if (!CompoundAssignmentInstruction.IsBinaryCompatibleWithType(binary, targetType)) |
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if (!ValidateCompoundAssign(binary, conv, targetType)) |
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return false; |
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if (conv != null && !(conv.TargetType == targetType.ToPrimitiveType() && conv.CheckForOverflow == binary.CheckForOverflow)) |
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return false; // conv does not match binary operation
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context.Step($"Inline compound assignment to '{getterCall.Method.AccessorOwner.Name}'", setterCall); |
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block.Instructions.RemoveAt(i + 1); // remove setter call
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mainStLoc.Value = new CompoundAssignmentInstruction( |
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@ -267,14 +327,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -267,14 +327,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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/// </remarks>
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internal static bool HandleStObjCompoundAssign(StObj inst, ILTransformContext context) |
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{ |
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ILInstruction value = inst.Value; |
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if (value is Conv conv && conv.Kind == ConversionKind.Truncate && conv.TargetType.IsSmallIntegerType()) { |
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// for compound assignments to small integers, the compiler emits a "conv" instruction
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value = conv.Argument; |
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} else { |
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conv = null; |
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} |
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if (!(value is BinaryNumericInstruction binary)) |
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if (!(UnwrapSmallIntegerConv(inst.Value, out var conv) is BinaryNumericInstruction binary)) |
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return false; |
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if (!(binary.Left is LdObj ldobj)) |
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return false; |
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@ -293,10 +346,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -293,10 +346,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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} else { |
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targetType = ldobj.Type; |
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} |
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if (!CompoundAssignmentInstruction.IsBinaryCompatibleWithType(binary, targetType)) |
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if (!ValidateCompoundAssign(binary, conv, targetType)) |
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return false; |
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if (conv != null && !(conv.TargetType == targetType.ToPrimitiveType() && conv.CheckForOverflow == binary.CheckForOverflow)) |
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return false; // conv does not match binary operation
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context.Step("compound assignment", inst); |
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inst.ReplaceWith(new CompoundAssignmentInstruction( |
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binary, binary.Left, binary.Right, |
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@ -310,16 +361,18 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -310,16 +361,18 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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/// -->
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/// stloc s(stloc l(value))
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/// </code>
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bool TransformInlineAssignmentLocal(Block block, int i) |
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bool TransformInlineAssignmentLocal(Block block, int pos) |
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{ |
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var inst = block.Instructions[i] as StLoc; |
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var nextInst = block.Instructions.ElementAtOrDefault(i + 1) as StLoc; |
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var inst = block.Instructions[pos] as StLoc; |
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var nextInst = block.Instructions.ElementAtOrDefault(pos + 1) as StLoc; |
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if (inst == null || nextInst == null) |
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return false; |
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if (inst.Variable.Kind != VariableKind.StackSlot) |
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return false; |
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Debug.Assert(!inst.Variable.Type.IsSmallIntegerType()); |
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if (nextInst.Variable.Kind != VariableKind.Local || !nextInst.Value.MatchLdLoc(inst.Variable)) |
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if (!(nextInst.Variable.Kind == VariableKind.Local || nextInst.Variable.Kind == VariableKind.Parameter)) |
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return false; |
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if (!nextInst.Value.MatchLdLoc(inst.Variable)) |
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return false; |
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if (IsImplicitTruncation(inst.Value, nextInst.Variable.Type)) { |
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// 'stloc l' is implicitly truncating the stack value
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@ -329,7 +382,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -329,7 +382,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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var value = inst.Value; |
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var var = nextInst.Variable; |
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var stackVar = inst.Variable; |
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block.Instructions.RemoveAt(i); |
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block.Instructions.RemoveAt(pos); |
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nextInst.ReplaceWith(new StLoc(stackVar, new StLoc(var, value))); |
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return true; |
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} |
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@ -408,48 +461,49 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -408,48 +461,49 @@ namespace ICSharpCode.Decompiler.IL.Transforms
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nextInst.ReplaceWith(new StLoc(inst.Variable, assignment)); |
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return true; |
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} |
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/// ldaddress ::= ldelema | ldflda | ldsflda;
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/// <code>
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/// stloc s(ldaddress)
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/// stloc l(ldobj(ldloc s))
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/// stobj(ldloc s, binary.op(ldloc l, ldc.i4 1))
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/// stobj(target, binary.add(stloc l(ldobj(target)), ldc.i4 1))
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/// where target is pure and does not use 'l'
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/// -->
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/// stloc l(compound.op.old(ldobj(ldaddress), ldc.i4 1))
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/// stloc l(compound.op.old(ldobj(target), ldc.i4 1))
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/// </code>
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bool TransformPostIncDecOperatorOnAddress(Block block, int i) |
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{ |
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var inst = block.Instructions[i] as StLoc; |
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var nextInst = block.Instructions.ElementAtOrDefault(i + 1) as StLoc; |
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var stobj = block.Instructions.ElementAtOrDefault(i + 2) as StObj; |
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if (inst == null || nextInst == null || stobj == null) |
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if (!(block.Instructions[i] is StObj stobj)) |
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return false; |
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if (!inst.Variable.IsSingleDefinition || inst.Variable.LoadCount != 2) |
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var binary = UnwrapSmallIntegerConv(stobj.Value, out var conv) as BinaryNumericInstruction; |
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if (binary == null || !binary.Right.MatchLdcI4(1)) |
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return false; |
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if (!(inst.Value is LdElema || inst.Value is LdFlda || inst.Value is LdsFlda)) |
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if (!(binary.Operator == BinaryNumericOperator.Add || binary.Operator == BinaryNumericOperator.Sub)) |
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return false; |
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ILInstruction target; |
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IType targetType; |
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if (nextInst.Variable.Kind == VariableKind.StackSlot || !nextInst.Value.MatchLdObj(out target, out targetType) || !target.MatchLdLoc(inst.Variable)) |
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if (!(binary.Left is StLoc stloc)) |
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return false; |
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if (!stobj.Target.MatchLdLoc(inst.Variable)) |
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if (!(stloc.Variable.Kind == VariableKind.Local || stloc.Variable.Kind == VariableKind.StackSlot)) |
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return false; |
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var binary = stobj.Value as BinaryNumericInstruction; |
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if (binary == null || !binary.Left.MatchLdLoc(nextInst.Variable) || !binary.Right.MatchLdcI4(1) |
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|| (binary.Operator != BinaryNumericOperator.Add && binary.Operator != BinaryNumericOperator.Sub)) |
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if (!(stloc.Value is LdObj ldobj)) |
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return false; |
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|
context.Step($"TransformPostIncDecOperator", inst); |
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|
var assignment = new CompoundAssignmentInstruction(binary, new LdObj(inst.Value, targetType), binary.Right, targetType, CompoundAssignmentType.EvaluatesToOldValue); |
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stobj.ReplaceWith(new StLoc(nextInst.Variable, assignment)); |
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block.Instructions.RemoveAt(i + 1); |
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if (!SemanticHelper.IsPure(ldobj.Target.Flags)) |
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return false; |
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if (!ldobj.Target.Match(stobj.Target).Success) |
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return false; |
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|
|
if (stloc.Variable.IsUsedWithin(ldobj.Target)) |
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|
return false; |
|
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|
IType targetType = ldobj.Type; |
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|
|
if (!ValidateCompoundAssign(binary, conv, targetType)) |
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|
|
return false; |
|
|
|
|
context.Step("TransformPostIncDecOperatorOnAddress", stobj); |
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|
|
block.Instructions[i] = new StLoc(stloc.Variable, new CompoundAssignmentInstruction( |
|
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|
|
binary, ldobj, binary.Right, targetType, CompoundAssignmentType.EvaluatesToOldValue)); |
|
|
|
|
return true; |
|
|
|
|
} |
|
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|
|
|
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|
|
/// <code>
|
|
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|
|
/// stloc l(ldobj(ldflda(target)))
|
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|
|
/// stobj(ldflda(target), binary.op(ldloc l, ldc.i4 1))
|
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|
|
/// stloc l(ldobj(target))
|
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|
/// stobj(target, binary.op(ldloc l, ldc.i4 1))
|
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|
/// target is pure and does not use 'l'
|
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|
/// -->
|
|
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|
|
/// compound.op.old(ldobj(ldflda(target)), ldc.i4 1)
|
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|
|
/// stloc l(compound.op.old(ldobj(target), ldc.i4 1))
|
|
|
|
|
/// </code>
|
|
|
|
|
bool TransformRoslynPostIncDecOperatorOnAddress(Block block, int i) |
|
|
|
|
{ |
|
|
|
|
@ -457,21 +511,25 @@ namespace ICSharpCode.Decompiler.IL.Transforms
@@ -457,21 +511,25 @@ namespace ICSharpCode.Decompiler.IL.Transforms
|
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|
|
|
var stobj = block.Instructions.ElementAtOrDefault(i + 1) as StObj; |
|
|
|
|
if (inst == null || stobj == null) |
|
|
|
|
return false; |
|
|
|
|
if (!inst.Variable.IsSingleDefinition || inst.Variable.LoadCount != 1) |
|
|
|
|
if (!(inst.Value is LdObj ldobj)) |
|
|
|
|
return false; |
|
|
|
|
if (!inst.Value.MatchLdObj(out var loadTarget, out var loadType) || !loadTarget.MatchLdFlda(out var fieldTarget, out var field)) |
|
|
|
|
if (!SemanticHelper.IsPure(ldobj.Target.Flags)) |
|
|
|
|
return false; |
|
|
|
|
if (!stobj.Target.MatchLdFlda(out var fieldTarget2, out var field2)) |
|
|
|
|
if (!ldobj.Target.Match(stobj.Target).Success) |
|
|
|
|
return false; |
|
|
|
|
if (!fieldTarget.Match(fieldTarget2).Success || !field.Equals(field2)) |
|
|
|
|
if (inst.Variable.IsUsedWithin(ldobj.Target)) |
|
|
|
|
return false; |
|
|
|
|
var binary = stobj.Value as BinaryNumericInstruction; |
|
|
|
|
if (binary == null || !binary.Left.MatchLdLoc(inst.Variable) || !binary.Right.MatchLdcI4(1) |
|
|
|
|
|| (binary.Operator != BinaryNumericOperator.Add && binary.Operator != BinaryNumericOperator.Sub)) |
|
|
|
|
var binary = UnwrapSmallIntegerConv(stobj.Value, out var conv) as BinaryNumericInstruction; |
|
|
|
|
if (binary == null || !binary.Left.MatchLdLoc(inst.Variable) || !binary.Right.MatchLdcI4(1)) |
|
|
|
|
return false; |
|
|
|
|
if (!(binary.Operator == BinaryNumericOperator.Add || binary.Operator == BinaryNumericOperator.Sub)) |
|
|
|
|
return false; |
|
|
|
|
context.Step("TransformRoslynPostIncDecOperator", inst); |
|
|
|
|
stobj.ReplaceWith(new CompoundAssignmentInstruction(binary, inst.Value, binary.Right, loadType, CompoundAssignmentType.EvaluatesToOldValue)); |
|
|
|
|
block.Instructions.RemoveAt(i); |
|
|
|
|
var targetType = ldobj.Type; |
|
|
|
|
if (!ValidateCompoundAssign(binary, conv, targetType)) |
|
|
|
|
return false; |
|
|
|
|
context.Step("TransformRoslynPostIncDecOperatorOnAddress", inst); |
|
|
|
|
inst.Value = new CompoundAssignmentInstruction(binary, inst.Value, binary.Right, targetType, CompoundAssignmentType.EvaluatesToOldValue); |
|
|
|
|
block.Instructions.RemoveAt(i + 1); |
|
|
|
|
return true; |
|
|
|
|
} |
|
|
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|
Daniel Grunwald
8 years ago