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[clang][CoverageMapping] "Assertion AfterLoc.isValid() failed" during compiling switch within statement expressions #86998

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whentojump opened this issue Mar 28, 2024 · 2 comments · Fixed by #89564
Closed

[clang][CoverageMapping] "Assertion AfterLoc.isValid() failed" during compiling switch within statement expressions #86998

whentojump opened this issue Mar 28, 2024 · 2 comments · Fixed by #89564
Labels
clang:codegen IR generation bugs: mangling, exceptions, etc. coverage crash Prefer [crash-on-valid] or [crash-on-invalid]

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@whentojump
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When a statement expression contains a switch statement during a partial struct initialization, source-based code coverage will crash. E.g.,

    struct Foo foo = {
        .field1 = ({
            switch (123) {
            case 123:
                break;
            }
            456;
        }),
    };

Compiler explorer link

clang: /root/llvm-project/clang/lib/CodeGen/CoverageMappingGen.cpp:1238: std::optional<clang::SourceRange> {anonymous}::CounterCoverageMappingBuilder::findGapAreaBetween(clang::SourceLocation, clang::SourceLocation): Assertion `AfterLoc.isValid()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -fprofile-instr-generate -fcoverage-mapping <source>
1.	<eof> parser at end of file
2.	<source>:20:5: LLVM IR generation of declaration 'main'
3.	<source>:20:5: Generating code for declaration 'main'
 #0 0x0000000003922c78 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3922c78)
 #1 0x000000000392095c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x392095c)
 #2 0x00000000038671f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f5cbfc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f5cbfc969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f5cbfc42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f5cbfc287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f5cbfc2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f5cbfc39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000003d79e01 (anonymous namespace)::CounterCoverageMappingBuilder::findGapAreaBetween(clang::SourceLocation, clang::SourceLocation) CoverageMappingGen.cpp:0:0
#10 0x0000000003d8327b (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#11 0x0000000003d81176 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void>::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#12 0x0000000003d832b3 (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#13 0x0000000003d81de0 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void>::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#14 0x0000000003d832b3 (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#15 0x0000000003d81e9f clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void>::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#16 0x0000000003d88c7b clang::CodeGen::CoverageMappingGen::emitCounterMapping(clang::Decl const*, llvm::raw_ostream&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d88c7b)
#17 0x0000000003d324a8 clang::CodeGen::CodeGenPGO::emitCounterRegionMapping(clang::Decl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d324a8)
#18 0x0000000003d67ddb clang::CodeGen::CodeGenPGO::assignRegionCounters(clang::GlobalDecl, llvm::Function*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d67ddb)
#19 0x0000000003cc5339 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3cc5339)
#20 0x0000000003d24952 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d24952)
#21 0x0000000003d1f205 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d1f205)
#22 0x0000000003d201e0 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d201e0)
#23 0x0000000003d29d83 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#24 0x00000000041cee86 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#25 0x00000000041bf7a8 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41bf7a8)
#26 0x00000000061c8fe4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c8fe4)
#27 0x00000000041cc9c8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41cc9c8)
#28 0x000000000444c039 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x444c039)
#29 0x00000000043d572e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43d572e)
#30 0x000000000452eece clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x452eece)
#31 0x0000000000c3d6dc cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3d6dc)
#32 0x0000000000c3696a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#33 0x000000000420f949 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#34 0x00000000038676a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x38676a4)
#35 0x000000000420ff3f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#36 0x00000000041d62d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41d62d5)
#37 0x00000000041d6d3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41d6d3d)
#38 0x00000000041deaa5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41deaa5)
#39 0x0000000000c3ab75 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3ab75)
#40 0x0000000000b1dd24 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xb1dd24)
#41 0x00007f5cbfc29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#42 0x00007f5cbfc29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#43 0x0000000000c3645e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3645e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Mar 28, 2024
@whentojump whentojump added clang:codegen IR generation bugs: mangling, exceptions, etc. coverage labels Mar 28, 2024
@llvmbot
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llvmbot commented Mar 28, 2024

@llvm/issue-subscribers-clang-codegen

Author: Wentao Zhang (whentojump)

When a [statement expression](https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html) contains a `switch` statement during a partial struct initialization, source-based code coverage will crash. E.g., 
    struct Foo foo = {
        .field1 = ({
            switch (123) {
            case 123:
                break;
            }
            456;
        }),
    };

Compiler explorer link

clang: /root/llvm-project/clang/lib/CodeGen/CoverageMappingGen.cpp:1238: std::optional&lt;clang::SourceRange&gt; {anonymous}::CounterCoverageMappingBuilder::findGapAreaBetween(clang::SourceLocation, clang::SourceLocation): Assertion `AfterLoc.isValid()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -fprofile-instr-generate -fcoverage-mapping &lt;source&gt;
1.	&lt;eof&gt; parser at end of file
2.	&lt;source&gt;:20:5: LLVM IR generation of declaration 'main'
3.	&lt;source&gt;:20:5: Generating code for declaration 'main'
 #<!-- -->0 0x0000000003922c78 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3922c78)
 #<!-- -->1 0x000000000392095c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x392095c)
 #<!-- -->2 0x00000000038671f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007f5cbfc42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007f5cbfc969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007f5cbfc42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007f5cbfc287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007f5cbfc2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007f5cbfc39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x0000000003d79e01 (anonymous namespace)::CounterCoverageMappingBuilder::findGapAreaBetween(clang::SourceLocation, clang::SourceLocation) CoverageMappingGen.cpp:0:0
#<!-- -->10 0x0000000003d8327b (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->11 0x0000000003d81176 clang::StmtVisitorBase&lt;llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void&gt;::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->12 0x0000000003d832b3 (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->13 0x0000000003d81de0 clang::StmtVisitorBase&lt;llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void&gt;::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->14 0x0000000003d832b3 (anonymous namespace)::CounterCoverageMappingBuilder::VisitStmt(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->15 0x0000000003d81e9f clang::StmtVisitorBase&lt;llvm::make_const_ptr, (anonymous namespace)::CounterCoverageMappingBuilder, void&gt;::Visit(clang::Stmt const*) CoverageMappingGen.cpp:0:0
#<!-- -->16 0x0000000003d88c7b clang::CodeGen::CoverageMappingGen::emitCounterMapping(clang::Decl const*, llvm::raw_ostream&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d88c7b)
#<!-- -->17 0x0000000003d324a8 clang::CodeGen::CodeGenPGO::emitCounterRegionMapping(clang::Decl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d324a8)
#<!-- -->18 0x0000000003d67ddb clang::CodeGen::CodeGenPGO::assignRegionCounters(clang::GlobalDecl, llvm::Function*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d67ddb)
#<!-- -->19 0x0000000003cc5339 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3cc5339)
#<!-- -->20 0x0000000003d24952 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d24952)
#<!-- -->21 0x0000000003d1f205 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d1f205)
#<!-- -->22 0x0000000003d201e0 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3d201e0)
#<!-- -->23 0x0000000003d29d83 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#<!-- -->24 0x00000000041cee86 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#<!-- -->25 0x00000000041bf7a8 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41bf7a8)
#<!-- -->26 0x00000000061c8fe4 clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c8fe4)
#<!-- -->27 0x00000000041cc9c8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41cc9c8)
#<!-- -->28 0x000000000444c039 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x444c039)
#<!-- -->29 0x00000000043d572e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43d572e)
#<!-- -->30 0x000000000452eece clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x452eece)
#<!-- -->31 0x0000000000c3d6dc cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3d6dc)
#<!-- -->32 0x0000000000c3696a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->33 0x000000000420f949 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->34 0x00000000038676a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x38676a4)
#<!-- -->35 0x000000000420ff3f clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->36 0x00000000041d62d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41d62d5)
#<!-- -->37 0x00000000041d6d3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41d6d3d)
#<!-- -->38 0x00000000041deaa5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41deaa5)
#<!-- -->39 0x0000000000c3ab75 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3ab75)
#<!-- -->40 0x0000000000b1dd24 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xb1dd24)
#<!-- -->41 0x00007f5cbfc29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->42 0x00007f5cbfc29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->43 0x0000000000c3645e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc3645e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

@whentojump whentojump changed the title [clang][CoverageMapping] assertion failure during compiling switch within statement expressions [clang][CoverageMapping] "Assertion AfterLoc.isValid()' failed" during compiling switch` within statement expressions Mar 28, 2024
@whentojump whentojump changed the title [clang][CoverageMapping] "Assertion AfterLoc.isValid()' failed" during compiling switch` within statement expressions [clang][CoverageMapping] "Assertion AfterLoc.isValid() failed" during compiling switch within statement expressions Mar 28, 2024
@EugeneZelenko EugeneZelenko added crash Prefer [crash-on-valid] or [crash-on-invalid] and removed clang Clang issues not falling into any other category labels Mar 28, 2024
@whentojump
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The root cause is somewhat clearer and here are two refined examples: 1, 2

The more accurate triggering condition is: In AST, any region terminator (like break and goto) is followed by a stmt with <invalid sloc> (like ImplicitValueInitExpr). Because a terminator is seen, the below branch will be executed when visiting the 2nd stmt:

llvm-project/clang/lib/CodeGen/CoverageMappingGen.cpp

Lines 1375 to 1376 in e6c3289

if (LastStmt && HasTerminateStmt && !isa<AttributedStmt>(Child)) {
auto Gap = findGapAreaBetween(getEnd(LastStmt), getStart(Child));

However, the 2nd stmt doesn't have a valid source location and will fail some assertions in findGapAreaBetween().

@whentojump whentojump mentioned this issue Apr 22, 2024
Merged
whentojump added a commit that referenced this issue Apr 22, 2024
@whentojump
[clang][CoverageMapping] do not emit a gap region when either end doe…
c1b6cca 
…sn't have valid source locations (#89564)

Fixes #86998
llvmbot pushed a commit to llvmbot/llvm-project that referenced this issue Apr 28, 2024
@whentojump @llvmbot
[clang][CoverageMapping] do not emit a gap region when either end doe…
71dd393 
…sn't have valid source locations (llvm#89564)

Fixes llvm#86998

(cherry picked from commit c1b6cca)
tstellar pushed a commit to llvmbot/llvm-project that referenced this issue Apr 30, 2024
@whentojump @tstellar
[clang][CoverageMapping] do not emit a gap region when either end doe…
aea091b 
…sn't have valid source locations (llvm#89564)

Fixes llvm#86998

(cherry picked from commit c1b6cca)
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