[NativeAOT] Broken COMDAT support in ObjWriter #77491

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[NativeAOT] Broken COMDAT support in ObjWriter#77491
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area-NativeAOT-coreclr
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@filipnavara
filipnavara
opened on Oct 26, 2022

There are multiple bugs in ObjWriter emission of COMDAT sections:

  • For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
  • For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
  • For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
  • For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.

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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    [NativeAOT] Broken COMDAT support in ObjWriter #77491
    Open
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    [NativeAOT] Broken COMDAT support in ObjWriter#77491
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    area-NativeAOT-coreclr
    Milestone
    Future
    Description
    @filipnavara
    filipnavara
    opened on Oct 26, 2022
    There are multiple bugs in ObjWriter emission of COMDAT sections:
    •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
    •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
    •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
    •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
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var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
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} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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      [NativeAOT] Broken COMDAT support in ObjWriter #77491
      Open
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      [NativeAOT] Broken COMDAT support in ObjWriter#77491
      Labels
      area-NativeAOT-coreclr
      Milestone
      Future
      Description
      @filipnavara
      filipnavara
      opened on Oct 26, 2022
      There are multiple bugs in ObjWriter emission of COMDAT sections:
      •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
      •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
      •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
      •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        [NativeAOT] Broken COMDAT support in ObjWriter #77491
        Open
        Open
        [NativeAOT] Broken COMDAT support in ObjWriter#77491
        Labels
        area-NativeAOT-coreclr
        Milestone
        Future
        Description
        @filipnavara
        filipnavara
        opened on Oct 26, 2022
        There are multiple bugs in ObjWriter emission of COMDAT sections:
        •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
        •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
        •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
        •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
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});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
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}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          [NativeAOT] Broken COMDAT support in ObjWriter #77491
          Open
          Open
          [NativeAOT] Broken COMDAT support in ObjWriter#77491
          Labels
          area-NativeAOT-coreclr
          Milestone
          Future
          Description
          @filipnavara
          filipnavara
          opened on Oct 26, 2022
          There are multiple bugs in ObjWriter emission of COMDAT sections:
          •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
          •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
          •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
          •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
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lastUrl = location.href;
setTimeout(tryTheater, 500);
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// Also try on player load
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            [NativeAOT] Broken COMDAT support in ObjWriter #77491
            Open
            Open
            [NativeAOT] Broken COMDAT support in ObjWriter#77491
            Labels
            area-NativeAOT-coreclr
            Milestone
            Future
            Description
            @filipnavara
            filipnavara
            opened on Oct 26, 2022
            There are multiple bugs in ObjWriter emission of COMDAT sections:
            •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
            •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
            •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
            •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
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function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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              [NativeAOT] Broken COMDAT support in ObjWriter #77491
              Open
              Open
              [NativeAOT] Broken COMDAT support in ObjWriter#77491
              Labels
              area-NativeAOT-coreclr
              Milestone
              Future
              Description
              @filipnavara
              filipnavara
              opened on Oct 26, 2022
              There are multiple bugs in ObjWriter emission of COMDAT sections:
              •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
              •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
              •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
              •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
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filter: invert(1) hue-rotate(180deg) !important;
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[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
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/* Fix common UI elements */
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filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
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::-webkit-scrollbar-thumb { background: #444 !important; }
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::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
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e.preventDefault();
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applyDarkMode();
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observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                [NativeAOT] Broken COMDAT support in ObjWriter #77491
                Open
                Open
                [NativeAOT] Broken COMDAT support in ObjWriter#77491
                Labels
                area-NativeAOT-coreclr
                Milestone
                Future
                Description
                @filipnavara
                filipnavara
                opened on Oct 26, 2022
                There are multiple bugs in ObjWriter emission of COMDAT sections:
                •  For COFF there's always one .debug$S section which is incorrect. For methods emitted in COMDAT sections there should a new associated COMDAT .debug$S section for each (eg. EmitCVDebugFunctionInfo should have similar section handling code to EmitWinFrameInfo).
                •  For COFF the xdata section with UNWIND_INFO structures is not emitted as associated COMDAT. This mostly works due to unique symbol prefixes but it's not ideal.
                •  For ELF incorrect relocation types are produced between sections (RELPTR32 is not expressed as PLT relocation). This results in error in ObjWriter if one tries to use ILCompiler with --multifile switch.
                •  For MachO the support is completely missing. It can likely be implemented with the S_COALESCE feature which serves the same purpose.
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