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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - AssemblyWriter::printModuleSummaryIndex(): Assertion `ModPath.second.first < moduleVec.size()' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=37899">37899</a>
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<th>Summary</th>
<td>AssemblyWriter::printModuleSummaryIndex(): Assertion `ModPath.second.first < moduleVec.size()' failed.
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Core LLVM classes
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>vlad@tsyrklevich.net
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, tejohnson@google.com
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<div>
<pre>If you make the following change to always dump ImportSummary in the backends:
$ git diff -U1
diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp
b/lib/Transforms/IPO/PassManagerBuilder.cpp
index a2559bc70b..91eb46ed3e 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -886,4 +886,6 @@ void PassManagerBuilder::addLateLTOOptimizationPasses(
+#include "llvm/IR/ModuleSummaryIndex.h"
void PassManagerBuilder::populateThinLTOPassManager(
legacy::PassManagerBase &PM) {
+ if (ImportSummary) ImportSummary->dump();
PerformThinLTO = true;
You will hit the titled exception with test/LTO/Resolution/X86/mod-asm-used.ll
>From a brief look it looks like mod-asm-used.ll only has some inline assembly
and doesn't generate a summary, when the printModuleSummaryIndex() is reached
it has the following summary:
^0 = module: (path: "", hash: (0, 0, 0, 0, 0))
^1 = module: (path: "/test/LTO/Resolution/X86/Output/mod-asm-used.ll.tmp2.bc",
hash: (0, 0, 0, 0, 0))
^1 = gv: (name: "foo", summaries: (variable: (module: ^1, flags: (linkage:
external, notEligibleToImport: 0, live: 1, dsoLocal: 1)))) ; guid =
6699318081062747564
TheIndex->modulePaths().size() returns 1 but the ModPath.second.first value in
the loop is 1 not 0. Not familiar with how aggregation of summaries is
performed; however, note that ^1 occurs twice above, that seems like it might
also have to do with this bug?</pre>
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