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POGenerating IL for double arrays
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copied!<p>I’m writing some IL institutions for creating <code>int</code> and <code>double</code> arrays using System.Reflection.Emit name space.</p> <p>For creating <code>int</code> array I’m using following code.</p> <pre><code>LocalBuilder arr = gen.DeclareLocal(typeof(int)); gen.Emit(OpCodes.Ldc_I4_1); gen.Emit(OpCodes.Newarr, typeof(int)); gen.Emit(OpCodes.Stloc, arr); gen.Emit(OpCodes.Ldloc, arr); gen.Emit(OpCodes.Ldc_I4_0); gen.Emit(OpCodes.Ldc_I4, 500); gen.Emit(OpCodes.Stelem_I4); gen.Emit(OpCodes.Ldloc, arr); gen.Emit(OpCodes.Ldc_I4_0); gen.Emit(OpCodes.Ldelem_I4); gen.Emit(OpCodes.Call,typeof(Console).GetMethod("WriteLine",new Type[]{typeof(int)})); </code></pre> <p>It’s working as expected and prints 500 on the Console.</p> <p>Same way I tried to create <code>double</code> array as shown below.</p> <pre><code>LocalBuilder arr = gen.DeclareLocal(typeof(double)); gen.Emit(OpCodes.Ldc_I4_1); gen.Emit(OpCodes.Newarr, typeof(double)); gen.Emit(OpCodes.Stloc, arr); gen.Emit(OpCodes.Ldloc, arr); gen.Emit(OpCodes.Ldc_I4_0); gen.Emit(OpCodes.Ldc_R8, 500D); gen.Emit(OpCodes.Stelem_R8); gen.Emit(OpCodes.Ldloc, arr); gen.Emit(OpCodes.Ldc_I4_0); gen.Emit(OpCodes.Ldelem_I8); gen.Emit(OpCodes.Call,typeof(Console).GetMethod("WriteLine",new Type[]{typeof(double)})); </code></pre> <p>Unfortunately this doesn’t work and when I inspect generated assembly using <code>pereview</code> it gave me following error.</p> <pre><code>Microsoft (R) .NET Framework PE Verifier. Version 4.0.30319.1 Copyright (c) Microsoft Corporation. All rights reserved. [IL]: Error: [C:\temp\Research\Research\bin\Debug\MyMod.exe : Foo::Main][offset 0x00000006][found ref array md array 'System.Double[]'][expected Double] Unexpected type on the stack. [IL]: Error: [C:\temp\Research\Research\bin\Debug\MyMod.exe : Foo::Main][offset 0x00000012] Expected single di mension array. 2 Error(s) Verifying MyMod.exe </code></pre> <p>Furthermore, I inspected generated assembly using <code>ildasm</code></p> <pre><code>.method privatescope static void Main$PST06000001() cil managed { .entrypoint // Code size 28 (0x1c) .maxstack 3 .locals init (float64 V_0) IL_0000: ldc.i4.1 IL_0001: newarr [mscorlib]System.Double IL_0006: stloc.0 IL_0007: ldloc.0 IL_0008: ldc.i4.0 IL_0009: ldc.r8 500. IL_0012: stelem.r8 IL_0013: ldloc.0 IL_0014: ldc.i4.0 IL_0015: ldelem.i8 IL_0016: call void [mscorlib]System.Console::WriteLine(float64) IL_001b: ret } // end of method Foo::Main </code></pre> <p>Do you have any idea?</p>

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