thegu5 Posts - Answer Overflow

thegu5

•Created by thegu5 on 6/13/2024 in #help

Float (signed) number comparisons compiled to unsigned version of instruction

Why does

    public bool lteq(float a, float b) {
        return a <= b;
    }

    public bool lteq(float a, float b) {
        return a <= b;
    }

compile to

        IL_0000: ldarg.1
        IL_0001: ldarg.2
        IL_0002: cgt.un
        IL_0004: ldc.i4.0
        IL_0005: ceq
        IL_0007: ret

        IL_0000: ldarg.1
        IL_0001: ldarg.2
        IL_0002: cgt.un
        IL_0004: ldc.i4.0
        IL_0005: ceq
        IL_0007: ret

whereas

    public bool not(float a, float b) {
        return !(a > b);
    }

    public bool not(float a, float b) {
        return !(a > b);
    }

compiles to the same thing but with cgt instead of cgt.un? Are these two expressions not equivalent? I'm also confused why it's using .un for two signed numbers that are ordered sharplab: https://sharplab.io/#v2:EYLgxg9gTgpgtADwGwBYA0AXEBLANgHwAEAmARgFgAoQgZgAIS6BhOgbyrs4fuAglzoA7CBgAUAM1wQAhhjrS0dSTLnAAlGw5dthAOx0AhKOl0AfHXUBuLZwC+N7hb4DcGGAEcJU2fMXKf6pqU2jr6JgA8ALwW1sFc9pS2QA

5 replies

CC#

•Created by thegu5 on 6/11/2024 in #help

Debugging a ReflectionTypeLoadException

I'm using a tool called Cpp2IL to generate types like this in assemblies:

c#
// Cpp2IlInjected.WasmMethod.WasmMethod
using System;

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
public sealed class WasmMethod : Attribute
{
    public int Index;
}

c#
// Cpp2IlInjected.WasmMethod.WasmMethod
using System;

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
public sealed class WasmMethod : Attribute
{
    public int Index;
}

(il:)

.class public auto ansi sealed Cpp2IlInjected.WasmMethod.WasmMethod
    extends [mscorlib]System.Attribute
{
    .custom instance void [mscorlib]System.AttributeUsageAttribute::.ctor(valuetype [mscorlib]System.AttributeTargets) = (
        01 00 40 00 00 00 01 00 54 02 0d 41 6c 6c 6f 77
        4d 75 6c 74 69 70 6c 65 00
    )
    // Fields
    .field public int32 Index

    // Methods
    .method public specialname rtspecialname 
        instance void .cctor () cil managed 
    {
        // Method begins at RVA 0x8d77
        // Header size: 1
        // Code size: 7 (0x7)
        .maxstack 8

        IL_0000: ldarg.0
        IL_0001: call instance void [mscorlib]System.Attribute::.ctor()
        IL_0006: ret
    } // end of method WasmMethod::.cctor

} // end of class Cpp2IlInjected.WasmMethod.WasmMethod

.class public auto ansi sealed Cpp2IlInjected.WasmMethod.WasmMethod
    extends [mscorlib]System.Attribute
{
    .custom instance void [mscorlib]System.AttributeUsageAttribute::.ctor(valuetype [mscorlib]System.AttributeTargets) = (
        01 00 40 00 00 00 01 00 54 02 0d 41 6c 6c 6f 77
        4d 75 6c 74 69 70 6c 65 00
    )
    // Fields
    .field public int32 Index

    // Methods
    .method public specialname rtspecialname 
        instance void .cctor () cil managed 
    {
        // Method begins at RVA 0x8d77
        // Header size: 1
        // Code size: 7 (0x7)
        .maxstack 8

        IL_0000: ldarg.0
        IL_0001: call instance void [mscorlib]System.Attribute::.ctor()
        IL_0006: ret
    } // end of method WasmMethod::.cctor

} // end of class Cpp2IlInjected.WasmMethod.WasmMethod

everything looks valid after comparing it to output from https://sharplab.io - so, are there any ways I continue debugging this to figure out what went wrong with generation? (/is there anything incorrect that stands out?)

3 replies

CC#

•Created by thegu5 on 6/5/2024 in #help

Error in Json Source Generation (ambiguous operator)

8 replies

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