You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.7 KiB
77 lines
2.7 KiB
// Copyright (c) 2021 Siegfried Pammer
|
|
//
|
|
// 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.
|
|
|
|
#nullable enable
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
|
|
using ICSharpCode.Decompiler.TypeSystem;
|
|
|
|
namespace ICSharpCode.Decompiler.IL.Transforms
|
|
{
|
|
// stloc s(ldloca v)
|
|
// stobj System.DateTime(ldloc s, default.value T)
|
|
// where s.LoadCount > 1
|
|
// which is: ldloca; dup; initobj in IL (generated by Roslyn >= 2)
|
|
// =>
|
|
// stloc v(default.value T)
|
|
// stloc s(ldloca v)
|
|
// which is: ldloca; ldloca; initobj in IL (generated by legacy csc)
|
|
//
|
|
// The second pattern allows inlining in the subsequent uses.
|
|
class LdLocaDupInitObjTransform : IILTransform
|
|
{
|
|
void IILTransform.Run(ILFunction function, ILTransformContext context)
|
|
{
|
|
foreach (var block in function.Descendants.OfType<Block>())
|
|
{
|
|
for (int i = 0; i < block.Instructions.Count; i++)
|
|
{
|
|
TryTransform(block, i, context);
|
|
}
|
|
}
|
|
}
|
|
|
|
private bool TryTransform(Block block, int i, ILTransformContext context)
|
|
{
|
|
if (block.Instructions[i] is not StLoc { Variable: var s, Value: LdLoca { Variable: var v } } inst1)
|
|
{
|
|
return false;
|
|
}
|
|
if (block.Instructions.ElementAtOrDefault(i + 1) is not StObj inst2)
|
|
{
|
|
return false;
|
|
}
|
|
if (!(inst2.Target.MatchLdLoc(s)
|
|
&& TypeUtils.IsCompatibleTypeForMemoryAccess(v.Type, inst2.Type)
|
|
&& inst2.UnalignedPrefix == 0
|
|
&& !inst2.IsVolatile
|
|
&& inst2.Value is DefaultValue))
|
|
{
|
|
return false;
|
|
}
|
|
context.Step("LdLocaDupInitObjTransform", inst1);
|
|
block.Instructions[i] = new StLoc(v, inst2.Value).WithILRange(inst2);
|
|
block.Instructions[i + 1] = inst1;
|
|
return true;
|
|
}
|
|
}
|
|
}
|