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POif statement works incorrectly - disassembling explains nothing for me
 

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  1. POif statement works incorrectly - disassembling explains nothing for me
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    <p>I encounter really weird problem on which I stuck.</p> <p>I am working on some class library which connects to webservices. The library is used by desktop applications.</p> <p>In the code I have now:</p> <pre><code>Int32 errorCode32 = errorCode; Int32 errorTimeout = 300; if (errorCode32.Equals(errorTimeout) == false) { System.Console.Out.WriteLine("aaa"); return; } </code></pre> <p>where errorCode equals to 300. So at the first glance it is visible, that if errorCode == 300 than the code inside the if statement should not be executed because it is defined to be executed only when errorCode is not equal to 300.</p> <p>Until now everything is clear, but now the whole fun starts. </p> <p>Application is working and the method with above code snippet is executed. errorCode is equal to 300, that is expected result is that the application will not execute any code inside if statement because whole statement is false. But in reality application goes inside "if" and immediately skips to the "return" statement. System.Console.Out... is never executed. If I will replace clean "return" statement with "throw new SomeException()"</p> <pre><code>Int32 errorCode32 = errorCode; Int32 errorTimeout = 300; if (errorCode32.Equals(errorTimeout) == false) { System.Console.Out.WriteLine("aaa"); throw new SomeException(); } </code></pre> <p>I will get the same result. Application goes into if statement (note: [errorCode32.Equals(errorTimeout) == false] is false in my case), don't execute Console.Out... but throws SomeException.</p> <p>I rebuilded everything several times, deleted all binaries, I even deleted whole project from disk and retrieved it again from repository to clean folder.</p> <p>I was so confused that I even disassembled the code to see what happens (even if I am not an expert in assembler). But results are strange for me.</p> <p>Disassembled code follows:</p> <pre><code> 50: Int32 errorCode32 = errorCode; 000000e5 mov eax,dword ptr [ebp-50h] 000000e8 mov dword ptr [ebp-54h],eax 51: Int32 errorTimeout = 300; 000000eb mov dword ptr [ebp-58h],12Ch 52: 53: if (errorCode32.Equals(errorTimeout) == false) 000000f2 lea ecx,[ebp-54h] 000000f5 mov edx,dword ptr [ebp-58h] 000000f8 call 699EB198 000000fd mov dword ptr [ebp-68h],eax 00000100 movzx eax,byte ptr [ebp-68h] 00000104 mov dword ptr [ebp-48h],eax 00000107 cmp dword ptr [ebp-48h],0 0000010b jne 00000134 54: { 0000010d nop 55: System.Console.Out.WriteLine("aaa"); 0000010e call 69538768 00000113 mov dword ptr [ebp+FFFFFF7Ch],eax 00000119 mov edx,dword ptr ds:[0302CE30h] 0000011f mov ecx,dword ptr [ebp+FFFFFF7Ch] 00000125 mov eax,dword ptr [ecx] 00000127 call dword ptr [eax+000000D8h] 0000012d nop 56: return; 0000012e nop 0000012f jmp 00000287 00000134 mov eax,dword ptr ds:[0302CE34h] 0000013a mov dword ptr [ebp-6Ch],eax 0000013d mov edx,5 00000142 mov ecx,6EDE3FBEh 00000147 call FA68D488 0000014c mov dword ptr [ebp-70h],eax 57: } </code></pre> <p>when I am debugging instructions I can understand what happens until the line:</p> <pre><code>00000104 mov dword ptr [ebp-48h],eax </code></pre> <p>I expect that value stored in eax will be copied to location "dword ptr [ebp-48h]" and application wiil go to next line (00000107). But this doesn't happen. When I am trying to step over line 00000104, application immediately jumps to line</p> <pre><code>00000134 mov eax,dword ptr ds:[0302CE34h] </code></pre> <p>I cannot understand what happens here. I tried to search over internet but I couldn't find anything useful. Does anybody have any suggestions what could be the reason of the problem or how to solve that?</p> <hr> <p>Edit</p> <p>I forgot to put information that I am using Visual Studio 2008 and compiling into .NET 3.5. All updates are installed.</p> <hr> <p>Edit</p> <p>Entire method in C#</p> <pre><code> private void nativeDocumentServiceWrapper_PostInvokeEvents(object sender, WebServiceInvokeEventArgs e) { Exception exception = e.Exception; if (exception == null) { _invokeRetries = 0; return; } string errorCodeString = ErrorHandler.GetErrorCodeString(exception); int errorCode; if (int.TryParse(errorCodeString, out errorCode)) { e.Exception = new VaultException(errorCode, exception); } Int32 errorCode32 = errorCode; Int32 errorTimeout = 300; if (errorCode32.Equals(errorTimeout) == false) { System.Console.Out.WriteLine("aaa"); return; } Trace.TraceWarning("Invoke failed (count: {4}) {0}.{1} #{2} error '{3}'", _moduleName, e.MethodName, _id, errorCodeString, _invokeRetries + 1); if (_invokeRetries &gt; 0) { //int errorCode; if (int.TryParse(errorCodeString, out errorCode)) { //throw new VaultException(errorCode, exception); e.Exception = new VaultException(errorCode, exception); } return; } e.Exception = null; // we ran into error 300 or 319 // the solution is to log in again and re-run the command tryReloginAndInvokeVaultMethodAgain(e); } </code></pre> <p>and disassembled:</p> <pre><code> 34: private void nativeDocumentServiceWrapper_PostInvokeEvents(object sender, WebServiceInvokeEventArgs e) 35: { 00000000 push ebp 00000001 mov ebp,esp 00000003 push edi 00000004 push esi 00000005 push ebx 00000006 sub esp,84h 0000000c mov esi,ecx 0000000e lea edi,[ebp-54h] 00000011 mov ecx,12h 00000016 xor eax,eax 00000018 rep stos dword ptr es:[edi] 0000001a mov ecx,esi 0000001c xor eax,eax 0000001e mov dword ptr [ebp-1Ch],eax 00000021 mov dword ptr [ebp-3Ch],ecx 00000024 mov dword ptr [ebp-40h],edx 00000027 cmp dword ptr ds:[01AD2DD8h],0 0000002e je 00000035 00000030 call 6AB8A719 00000035 mov dword ptr [ebp-48h],0 0000003c xor edx,edx 0000003e mov dword ptr [ebp-5Ch],edx 00000041 xor edx,edx 00000043 mov dword ptr [ebp-44h],edx 00000046 xor edx,edx 00000048 mov dword ptr [ebp-4Ch],edx 0000004b xor edx,edx 0000004d mov dword ptr [ebp-58h],edx 00000050 nop 36: Exception exception = e.Exception; 00000051 mov eax,dword ptr [ebp+8] 00000054 mov eax,dword ptr [eax+4] 00000057 mov dword ptr [ebp-44h],eax 37: if (exception == null) 0000005a cmp dword ptr [ebp-44h],0 0000005e setne al 00000061 movzx eax,al 00000064 mov dword ptr [ebp-48h],eax 00000067 cmp dword ptr [ebp-48h],0 0000006b jne 0000007F 38: { 0000006d nop 39: _invokeRetries = 0; 0000006e mov eax,dword ptr [ebp-3Ch] 00000071 xor edx,edx 00000073 mov dword ptr [eax+00000088h],edx 40: return; 00000079 nop 0000007a jmp 00000287 41: } 42: 43: string errorCodeString = ErrorHandler.GetErrorCodeString(exception); 0000007f mov ecx,dword ptr [ebp-44h] 00000082 call FF0827F0 00000087 mov dword ptr [ebp-60h],eax 0000008a mov eax,dword ptr [ebp-60h] 0000008d mov dword ptr [ebp-4Ch],eax 44: int errorCode; 45: if (int.TryParse(errorCodeString, out errorCode)) 00000090 lea edx,[ebp-50h] 00000093 mov ecx,dword ptr [ebp-4Ch] 00000096 call 694B44A8 0000009b mov dword ptr [ebp-64h],eax 0000009e cmp dword ptr [ebp-64h],0 000000a2 sete al 000000a5 movzx eax,al 000000a8 mov dword ptr [ebp-48h],eax 000000ab cmp dword ptr [ebp-48h],0 000000af jne 000000E5 46: { 000000b1 nop 47: e.Exception = new VaultException(errorCode, exception); 000000b2 mov ecx,5482E0Ch 000000b7 call FA68D364 000000bc mov dword ptr [ebp+FFFFFF78h],eax 000000c2 push dword ptr [ebp-44h] 000000c5 mov edx,dword ptr [ebp-50h] 000000c8 mov ecx,dword ptr [ebp+FFFFFF78h] 000000ce call FF07FCB0 000000d3 mov edx,dword ptr [ebp+8] 000000d6 mov eax,dword ptr [ebp+FFFFFF78h] 000000dc lea edx,[edx+4] 000000df call 6A90E288 48: } 000000e4 nop 49: 50: Int32 errorCode32 = errorCode; 000000e5 mov eax,dword ptr [ebp-50h] 000000e8 mov dword ptr [ebp-54h],eax 51: Int32 errorTimeout = 300; 000000eb mov dword ptr [ebp-58h],12Ch 52: 53: if (errorCode32.Equals(errorTimeout) == false) 000000f2 lea ecx,[ebp-54h] 000000f5 mov edx,dword ptr [ebp-58h] 000000f8 call 699EB198 000000fd mov dword ptr [ebp-68h],eax 00000100 movzx eax,byte ptr [ebp-68h] 00000104 mov dword ptr [ebp-48h],eax 00000107 cmp dword ptr [ebp-48h],0 0000010b jne 00000134 54: { 0000010d nop 55: System.Console.Out.WriteLine("aaa"); 0000010e call 69538768 00000113 mov dword ptr [ebp+FFFFFF7Ch],eax 00000119 mov edx,dword ptr ds:[0302CE30h] 0000011f mov ecx,dword ptr [ebp+FFFFFF7Ch] 00000125 mov eax,dword ptr [ecx] 00000127 call dword ptr [eax+000000D8h] 0000012d nop 56: return; 0000012e nop 0000012f jmp 00000287 00000134 mov eax,dword ptr ds:[0302CE34h] 0000013a mov dword ptr [ebp-6Ch],eax 0000013d mov edx,5 00000142 mov ecx,6EDE3FBEh 00000147 call FA68D488 0000014c mov dword ptr [ebp-70h],eax 57: } 58: 59: Trace.TraceWarning("Invoke failed (count: {4}) {0}.{1} #{2} error '{3}'", _moduleName, e.MethodName, _id, errorCodeString, _invokeRetries + 1); 0000014f mov eax,dword ptr [ebp-70h] 00000152 mov dword ptr [ebp-5Ch],eax 00000155 mov eax,dword ptr [ebp-3Ch] 00000158 push dword ptr [eax+00000080h] 0000015e mov ecx,dword ptr [ebp-5Ch] 00000161 xor edx,edx 00000163 call 6A914654 00000168 mov eax,dword ptr [ebp+8] 0000016b push dword ptr [eax+8] 0000016e mov ecx,dword ptr [ebp-5Ch] 00000171 mov edx,1 00000176 call 6A914654 0000017b mov ecx,6F052DA0h 00000180 call FA68D364 00000185 mov dword ptr [ebp-74h],eax 00000188 mov eax,dword ptr [ebp-5Ch] 0000018b mov dword ptr [ebp+FFFFFF74h],eax 00000191 mov eax,dword ptr [ebp-3Ch] 00000194 mov eax,dword ptr [eax+00000084h] 0000019a mov edx,dword ptr [ebp-74h] 0000019d mov dword ptr [edx+4],eax 000001a0 mov eax,dword ptr [ebp-74h] 000001a3 push eax 000001a4 mov ecx,dword ptr [ebp+FFFFFF74h] 000001aa mov edx,2 000001af call 6A914654 000001b4 push dword ptr [ebp-4Ch] 000001b7 mov ecx,dword ptr [ebp-5Ch] 000001ba mov edx,3 000001bf call 6A914654 000001c4 mov ecx,6F052DA0h 000001c9 call FA68D364 000001ce mov dword ptr [ebp-78h],eax 000001d1 mov eax,dword ptr [ebp-5Ch] 000001d4 mov dword ptr [ebp+FFFFFF70h],eax 000001da mov eax,dword ptr [ebp-3Ch] 000001dd mov eax,dword ptr [eax+00000088h] 000001e3 inc eax 000001e4 mov edx,dword ptr [ebp-78h] 000001e7 mov dword ptr [edx+4],eax 000001ea mov eax,dword ptr [ebp-78h] 000001ed push eax 000001ee mov ecx,dword ptr [ebp+FFFFFF70h] 000001f4 mov edx,4 000001f9 call 6A914654 000001fe mov edx,dword ptr [ebp-5Ch] 00000201 mov ecx,dword ptr [ebp-6Ch] 00000204 call 69039D88 00000209 nop 60: 61: if (_invokeRetries &gt; 0) 0000020a mov eax,dword ptr [ebp-3Ch] 0000020d cmp dword ptr [eax+00000088h],0 00000214 setle al 00000217 movzx eax,al 0000021a mov dword ptr [ebp-48h],eax 0000021d cmp dword ptr [ebp-48h],0 00000221 jne 00000273 62: { 00000223 nop 63: //int errorCode; 64: if (int.TryParse(errorCodeString, out errorCode)) 00000224 lea edx,[ebp-50h] 00000227 mov ecx,dword ptr [ebp-4Ch] 0000022a call 694B44A8 0000022f mov dword ptr [ebp-7Ch],eax 00000232 cmp dword ptr [ebp-7Ch],0 00000236 sete al 00000239 movzx eax,al 0000023c mov dword ptr [ebp-48h],eax 0000023f cmp dword ptr [ebp-48h],0 00000243 jne 00000270 65: { 00000245 nop 66: //throw new VaultException(errorCode, exception); 67: e.Exception = new VaultException(errorCode, exception); 00000246 mov ecx,5482E0Ch 0000024b call FA68D364 00000250 mov dword ptr [ebp-80h],eax 00000253 push dword ptr [ebp-44h] 00000256 mov edx,dword ptr [ebp-50h] 00000259 mov ecx,dword ptr [ebp-80h] 0000025c call FF07FCB0 00000261 mov edx,dword ptr [ebp+8] 00000264 mov eax,dword ptr [ebp-80h] 00000267 lea edx,[edx+4] 0000026a call 6A90E288 68: } 0000026f nop 69: return; 00000270 nop 00000271 jmp 00000287 70: } 71: 72: e.Exception = null; 00000273 mov eax,dword ptr [ebp+8] 00000276 xor edx,edx 00000278 mov dword ptr [eax+4],edx 73: 74: // we ran into error 300 or 319 75: // the solution is to log in again and re-run the command 76: 77: tryReloginAndInvokeVaultMethodAgain(e); 0000027b mov edx,dword ptr [ebp+8] 0000027e mov ecx,dword ptr [ebp-3Ch] 00000281 call FF0876C0 00000286 nop 78: } </code></pre>
    singulars
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMarcin Wieczorek
    1. USMarcin Wieczorek
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    1. PL
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      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. VO
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      1. POif statement works incorrectly - disassembling explains nothing for me
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POif statement works incorrectly - disassembling explains nothing for me
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
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      1. POif statement works incorrectly - disassembling explains nothing for me
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAdam - this was first what I checked. Please note that in question I described that "I rebuilded everything several times, deleted all binaries, I even deleted whole project from disk and retrieved it again from repository to clean folder."
      singulars
      1. POif statement works incorrectly - disassembling explains nothing for me
      1. USMarcin Wieczorek
    2. COJust curious, have you tried not doing the second equality operation and just write if(!errorCode32.Equals(errorTimeout))?
      singulars
      1. POif statement works incorrectly - disassembling explains nothing for me
      1. USBryan Naegele
    3. COYes Bryan - I tried. The "return" statement is not executed only if I literaly write "if (false)". In other cases the if behaves incorrectly. One additional thing - when if statement is true, whole content of if is executed. If the statement is false (by any calculation) application goes inside and executes only return/throw.
      singulars
      1. POif statement works incorrectly - disassembling explains nothing for me
      1. USMarcin Wieczorek
 

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