[llvm-bugs] [Bug 37899] New: AssemblyWriter::printModuleSummaryIndex(): Assertion `ModPath.second.first < moduleVec.size()' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37899

            Bug ID: 37899
           Summary: AssemblyWriter::printModuleSummaryIndex(): Assertion
                    `ModPath.second.first < moduleVec.size()' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: vlad at tsyrklevich.net
                CC: llvm-bugs at lists.llvm.org, tejohnson at google.com

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?

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