pimhwang
/
ILSpy
mirror of https://github.com/icsharpcode/ILSpy.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

Simplify operators on nullable values: primitive comparisons

pull/205/head
Pent Ploompuu 14 years ago
parent
f84556b4eb
commit
1628f2870c
3 changed files with 208 additions and 0 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 1
      ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
  2. 4
      ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs
  3. 203
      ICSharpCode.Decompiler/ILAst/NullableOperators.cs

1
ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
Unescape View File

@ -94,6 +94,7 @@ @@ -94,6 +94,7 @@
<Compile Include="FlowAnalysis\SsaOptimization.cs" />
<Compile Include="FlowAnalysis\SsaVariable.cs" />
<Compile Include="FlowAnalysis\TransformToSsa.cs" />
<Compile Include="ILAst\NullableOperators.cs" />
<Compile Include="ILAst\InitializerPeepholeTransforms.cs" />
<Compile Include="ILAst\DefaultDictionary.cs" />
<Compile Include="ILAst\GotoRemoval.cs" />

4
ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs
Unescape View File

@ -46,6 +46,7 @@ namespace ICSharpCode.Decompiler.ILAst @@ -46,6 +46,7 @@ namespace ICSharpCode.Decompiler.ILAst
SimplifyLdObjAndStObj,
TransformArrayInitializers,
TransformObjectInitializers,
SimplifyNullableOperators,
MakeAssignmentExpression,
IntroducePostIncrement,
InlineVariables2,
@ -141,6 +142,9 @@ namespace ICSharpCode.Decompiler.ILAst @@ -141,6 +142,9 @@ namespace ICSharpCode.Decompiler.ILAst
if (abortBeforeStep == ILAstOptimizationStep.TransformObjectInitializers) return;
modified |= block.RunOptimization(TransformObjectInitializers);
if (abortBeforeStep == ILAstOptimizationStep.SimplifyNullableOperators) return;
modified |= block.RunOptimization(SimplifyNullableOperators);
if (abortBeforeStep == ILAstOptimizationStep.MakeAssignmentExpression) return;
modified |= block.RunOptimization(MakeAssignmentExpression);

203
ICSharpCode.Decompiler/ILAst/NullableOperators.cs
Unescape View File

@ -0,0 +1,203 @@ @@ -0,0 +1,203 @@
// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
namespace ICSharpCode.Decompiler.ILAst
{
partial class ILAstOptimizer
{
bool SimplifyNullableOperators(List<ILNode> body, ILExpression expr, int pos)
{
if (!SimplifyNullableOperators(expr)) return false;
var inlining = new ILInlining(method);
do pos--;
while (inlining.InlineIfPossible(body, ref pos));
return true;
}
static bool SimplifyNullableOperators(ILExpression expr)
{
if (IsNullableOperation(expr)) return true;
bool modified = false;
foreach (var a in expr.Arguments)
modified |= SimplifyNullableOperators(a);
return modified;
}
static bool IsNullableOperation(ILExpression expr)
{
var ps = PatternMatcher.PrimitiveComparisons;
for (int i = 0; i < ps.Length; i += 2) {
var pm = new PatternMatcher();
if (!pm.Match(ps[i], expr)) continue;
var n = pm.BuildNew(ps[i + 1], expr);
expr.Code = n.Code;
expr.Operand = n.Operand;
expr.Arguments = n.Arguments;
expr.ILRanges = n.ILRanges;
return true;
}
return false;
}
struct PatternMatcher
{
public class Pattern
{
public readonly ILCode Code;
public readonly Pattern[] Arguments;
public Pattern(ILCode code, params Pattern[] arguments)
{
this.Code = code;
this.Arguments = arguments;
}
public virtual bool Match(ref PatternMatcher pm, ILExpression e) { return true; }
public virtual object GetOperand(ref PatternMatcher pm) { return null; }
}
sealed class MethodPattern : Pattern
{
public readonly Tuple<string, string, string> Method;
public MethodPattern(ILCode code, Tuple<string, string, string> method, params Pattern[] arguments)
: base(code, arguments)
{
this.Method = method;
}
public override bool Match(ref PatternMatcher pm, ILExpression e)
{
var m = e.Operand as MethodReference;
if (m == null || m.Name != this.Method.Item1) return false;
var t = m.DeclaringType;
return t.Name == this.Method.Item2 && t.Namespace == this.Method.Item3;
}
}
sealed class VariablePattern : Pattern
{
public readonly bool B;
public VariablePattern(ILCode code, bool b)
: base(code)
{
this.B = b;
}
public override bool Match(ref PatternMatcher pm, ILExpression e)
{
var v = e.Operand as ILVariable;
return v != null && (this.B ? Capture(ref pm.B, v) : Capture(ref pm.A, v));
}
static bool Capture(ref ILVariable pmvar, ILVariable v)
{
if (pmvar != null) return pmvar == v;
pmvar = v;
return true;
}
public override object GetOperand(ref PatternMatcher pm)
{
return this.B ? pm.B : pm.A;
}
}
sealed class PrimitivePattern : Pattern
{
public readonly object Operand;
public PrimitivePattern(ILCode code, object operand, params Pattern[] arguments)
: base(code, arguments)
{
this.Operand = operand;
}
public override bool Match(ref PatternMatcher pm, ILExpression e)
{
return object.Equals(e.Operand, this.Operand);
}
}
static readonly Tuple<string, string, string> GetValueOrDefault = new Tuple<string, string, string>("GetValueOrDefault", "Nullable`1", "System");
static readonly Tuple<string, string, string> get_HasValue = new Tuple<string, string, string>("get_HasValue", "Nullable`1", "System");
static readonly VariablePattern VariableRefA = new VariablePattern(ILCode.Ldloca, false), VariableRefB = new VariablePattern(ILCode.Ldloca, true);
static readonly VariablePattern[] VariableAB = new[] { new VariablePattern(ILCode.Ldloc, false), new VariablePattern(ILCode.Ldloc, true) };
static readonly MethodPattern[] Call2GetValueOrDefault = new[] {
new MethodPattern(ILCode.Call, GetValueOrDefault, VariableRefA),
new MethodPattern(ILCode.Call, GetValueOrDefault, VariableRefB)};
static readonly MethodPattern[] Call2get_HasValue = new[] {
new MethodPattern(ILCode.CallGetter, get_HasValue, VariableRefA),
new MethodPattern(ILCode.CallGetter, get_HasValue, VariableRefB) };
static readonly Pattern CeqHasValue = new Pattern(ILCode.Ceq, Call2get_HasValue);
static readonly Pattern AndHasValue = new Pattern(ILCode.And, Call2get_HasValue);
public static readonly Pattern[] PrimitiveComparisons = new[] {
// ==
new Pattern(ILCode.LogicAnd, new Pattern(ILCode.LogicNot, new Pattern(ILCode.LogicNot, new Pattern(ILCode.Ceq, Call2GetValueOrDefault))), CeqHasValue),
new Pattern(ILCode.Ceq, VariableAB),
// !=
new Pattern(ILCode.LogicOr,
new Pattern(ILCode.LogicNot, new Pattern(ILCode.Ceq, Call2GetValueOrDefault)),
new Pattern(ILCode.Ceq, CeqHasValue, new PrimitivePattern(ILCode.Ldc_I4, 0))),
new Pattern(ILCode.LogicNot, new Pattern(ILCode.Ceq, VariableAB)),
// >
new Pattern(ILCode.LogicAnd, new Pattern(ILCode.LogicNot, new Pattern(ILCode.LogicNot, new Pattern(ILCode.Cgt, Call2GetValueOrDefault))), AndHasValue),
new Pattern(ILCode.Cgt, VariableAB),
// <
new Pattern(ILCode.LogicAnd, new Pattern(ILCode.LogicNot, new Pattern(ILCode.LogicNot, new Pattern(ILCode.Clt, Call2GetValueOrDefault))), AndHasValue),
new Pattern(ILCode.Clt, VariableAB),
// >=
new Pattern(ILCode.LogicAnd, new Pattern(ILCode.LogicNot, new Pattern(ILCode.Clt, Call2GetValueOrDefault)), AndHasValue),
new Pattern(ILCode.LogicNot, new Pattern(ILCode.Clt, VariableAB)),
// <=
new Pattern(ILCode.LogicAnd, new Pattern(ILCode.LogicNot, new Pattern(ILCode.Cgt, Call2GetValueOrDefault)), AndHasValue),
new Pattern(ILCode.LogicNot, new Pattern(ILCode.Cgt, VariableAB)),
};
public ILVariable A, B;
public bool Match(Pattern p, ILExpression e)
{
if (e.Code != p.Code || e.Arguments.Count != p.Arguments.Length || e.Prefixes != null || !p.Match(ref this, e)) return false;
for (int i = 0; i < p.Arguments.Length; i++)
if (!Match(p.Arguments[i], e.Arguments[i])) return false;
return true;
}
public ILExpression BuildNew(Pattern p, ILExpression old)
{
var args = new ILExpression[p.Arguments.Length];
for (int i = 0; i < args.Length; i++) args[i] = BuildNew(p.Arguments[i], old);
var res = new ILExpression(p.Code, p.GetOperand(ref this), args);
if (args.Length == 2) res.ILRanges = ILRange.OrderAndJoint(old.GetSelfAndChildrenRecursive<ILExpression>().SelectMany(el => el.ILRanges));
return res;
}
}
}
}
Write Preview
Loading…
Cancel
Save