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[DLCov] Origin-Tracking: Add debugify support (#143594)
This patch is part of a series that adds origin-tracking to the debugify source location coverage checks, allowing us to report symbolized stack traces of the point where missing source locations appear. This patch completes the feature, having debugify handle origin stack traces by symbolizing them when an associated bug is found and printing them into the JSON report file as part of the bug entry. This patch also updates the script that parses the JSON report and creates a human-readable HTML report, adding an "Origin" entry to the table that contains an expandable textbox containing the symbolized stack trace.
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‎llvm/docs/HowToUpdateDebugInfo.rst

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@@ -420,7 +420,41 @@ tests. Changes to this pass are not allowed to break existing tests.
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check lines. In cases where this can't be avoided (say, if a test wouldn't
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be precise enough), moving the test to its own file is preferred.
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.. _MIRDebugify:
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Using Coverage Tracking to remove false positives
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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As described :ref:`above<WhenToDropLocation>`, there are valid reasons for
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instructions to not have source locations. Therefore, when detecting dropped or
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not-generated source locations, it may be preferable to avoid detecting cases
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where the missing source location is intentional. For this, you can use the
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"coverage tracking" feature in LLVM to prevent these from appearing in the
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``debugify`` output. This is enabled in a build of LLVM by setting the CMake
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flag ``-DLLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING=COVERAGE``. When this has been
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set, LLVM will enable runtime tracking of
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:ref:`DebugLoc annotations<NewInstLocations>`, allowing ``debugify`` to ignore
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instructions that have an explicitly recorded reason given for not having a
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source location.
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For triaging source location bugs detected with ``debugify``, you may find it
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helpful to instead set the CMake flag to enable "origin tracking",
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``-DLLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING=COVERAGE_AND_ORIGIN``. This flag adds
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more detail to ``debugify``'s output, by including one or more stacktraces with
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every missing source location, capturing the point at which the empty source
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location was created, and every point at which it was copied to an instruction,
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making it trivial in most cases to find the origin of the underlying bug. If
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using origin tracking, it is recommended to also build LLVM with debug info
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enabled, so that the stacktrace can be accurately symbolized.
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.. note::
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The coverage tracking feature has been designed primarily for use with the
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:ref:`original debug info preservation<OriginalDI>` mode of ``debugify``, and
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so may not be reliable in other settings. When using this mode, the
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stacktraces produced by the ``COVERAGE_AND_ORIGIN`` setting will be printed
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in an easy-to-read format as part of the reports generated by the
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``llvm-original-di-preservation.py`` script.
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.. _OriginalDI:
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Test original debug info preservation in optimizations
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------------------------------------------------------
@@ -478,6 +512,8 @@ as follows:
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Please do note that there are some known false positives, for source locations
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and debug record checking, so that will be addressed as a future work.
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.. _MIRDebugify:
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Mutation testing for MIR-level transformations
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----------------------------------------------
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‎llvm/include/llvm/Support/Signals.h

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@@ -26,10 +26,8 @@
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namespace llvm {
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// Typedefs that are convenient but only used by the stack-trace-collection code
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// added if DebugLoc origin-tracking is enabled.
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using AddressSet = DenseSet<void *, DenseMapInfo<void *, void>>;
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using SymbolizedAddressMap =
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DenseMap<void *, SmallVector<std::string, 0>, DenseMapInfo<void *, void>,
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detail::DenseMapPair<void *, SmallVector<std::string, 0>>>;
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using AddressSet = DenseSet<void *>;
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using SymbolizedAddressMap = DenseMap<void *, SmallVector<std::string, 0>>;
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} // namespace llvm
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#endif
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‎llvm/lib/Transforms/Utils/Debugify.cpp

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@@ -16,8 +16,10 @@
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#include "llvm/Transforms/Utils/Debugify.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/DIBuilder.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DebugLoc.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/IntrinsicInst.h"
@@ -28,6 +30,11 @@
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/JSON.h"
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#include <optional>
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#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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// We need the Signals header to operate on stacktraces if we're using DebugLoc
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// origin-tracking.
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#include "llvm/Support/Signals.h"
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#endif
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#define DEBUG_TYPE "debugify"
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@@ -59,6 +66,54 @@ cl::opt<Level> DebugifyLevel(
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raw_ostream &dbg() { return Quiet ? nulls() : errs(); }
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#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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// These maps refer to addresses in the current LLVM process, so we can reuse
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// them everywhere - therefore, we store them at file scope.
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static SymbolizedAddressMap SymbolizedAddrs;
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static AddressSet UnsymbolizedAddrs;
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std::string symbolizeStackTrace(const Instruction *I) {
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// We flush the set of unsymbolized addresses at the latest possible moment,
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// i.e. now.
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if (!UnsymbolizedAddrs.empty()) {
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sys::symbolizeAddresses(UnsymbolizedAddrs, SymbolizedAddrs);
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UnsymbolizedAddrs.clear();
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}
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const DbgLocOrigin::StackTracesTy &OriginStackTraces =
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I->getDebugLoc().getOriginStackTraces();
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std::string Result;
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raw_string_ostream OS(Result);
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for (size_t TraceIdx = 0; TraceIdx < OriginStackTraces.size(); ++TraceIdx) {
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if (TraceIdx != 0)
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OS << "========================================\n";
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auto &[Depth, StackTrace] = OriginStackTraces[TraceIdx];
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unsigned VirtualFrameNo = 0;
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for (int Frame = 0; Frame < Depth; ++Frame) {
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assert(SymbolizedAddrs.contains(StackTrace[Frame]) &&
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"Expected each address to have been symbolized.");
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for (std::string &SymbolizedFrame : SymbolizedAddrs[StackTrace[Frame]]) {
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OS << right_justify(formatv("#{0}", VirtualFrameNo++).str(),
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std::log10(Depth) + 2)
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<< ' ' << SymbolizedFrame << '\n';
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}
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}
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}
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return Result;
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}
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void collectStackAddresses(Instruction &I) {
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auto &OriginStackTraces = I.getDebugLoc().getOriginStackTraces();
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for (auto &[Depth, StackTrace] : OriginStackTraces) {
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for (int Frame = 0; Frame < Depth; ++Frame) {
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void *Addr = StackTrace[Frame];
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if (!SymbolizedAddrs.contains(Addr))
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UnsymbolizedAddrs.insert(Addr);
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}
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}
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}
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#else
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void collectStackAddresses(Instruction &I) {}
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#endif // LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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uint64_t getAllocSizeInBits(Module &M, Type *Ty) {
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return Ty->isSized() ? M.getDataLayout().getTypeAllocSizeInBits(Ty) : 0;
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}
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LLVM_DEBUG(dbgs() << " Collecting info for inst: " << I << '\n');
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DebugInfoBeforePass.InstToDelete.insert({&I, &I});
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// Track the addresses to symbolize, if the feature is enabled.
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collectStackAddresses(I);
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DebugInfoBeforePass.DILocations.insert({&I, hasLoc(I)});
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}
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}
@@ -450,14 +507,23 @@ static bool checkInstructions(const DebugInstMap &DILocsBefore,
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auto BBName = BB->hasName() ? BB->getName() : "no-name";
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auto InstName = Instruction::getOpcodeName(Instr->getOpcode());
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auto CreateJSONBugEntry = [&](const char *Action) {
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Bugs.push_back(llvm::json::Object({
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{"metadata", "DILocation"},
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{"fn-name", FnName.str()},
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{"bb-name", BBName.str()},
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{"instr", InstName},
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{"action", Action},
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#if LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN
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{"origin", symbolizeStackTrace(Instr)},
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#endif
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}));
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};
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auto InstrIt = DILocsBefore.find(Instr);
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if (InstrIt == DILocsBefore.end()) {
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if (ShouldWriteIntoJSON)
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Bugs.push_back(llvm::json::Object({{"metadata", "DILocation"},
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{"fn-name", FnName.str()},
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{"bb-name", BBName.str()},
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{"instr", InstName},
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{"action", "not-generate"}}));
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CreateJSONBugEntry("not-generate");
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else
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dbg() << "WARNING: " << NameOfWrappedPass
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<< " did not generate DILocation for " << *Instr
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// If the instr had the !dbg attached before the pass, consider it as
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// a debug info issue.
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if (ShouldWriteIntoJSON)
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Bugs.push_back(llvm::json::Object({{"metadata", "DILocation"},
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{"fn-name", FnName.str()},
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{"bb-name", BBName.str()},
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{"instr", InstName},
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{"action", "drop"}}));
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CreateJSONBugEntry("drop");
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else
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dbg() << "WARNING: " << NameOfWrappedPass << " dropped DILocation of "
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<< *Instr << " (BB: " << BBName << ", Fn: " << FnName
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LLVM_DEBUG(dbgs() << " Collecting info for inst: " << I << '\n');
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// Track the addresses to symbolize, if the feature is enabled.
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collectStackAddresses(I);
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DebugInfoAfterPass.DILocations.insert({&I, hasLoc(I)});
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}
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}

‎llvm/test/tools/llvm-original-di-preservation/Inputs/expected-origin.html

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<html>
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<head>
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<style>
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table, th, td {
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border: 1px solid black;
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}
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table.center {
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margin-left: auto;
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margin-right: auto;
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}
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</style>
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</head>
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<body>
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<table>
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<caption><b>Location Bugs found by the Debugify</b></caption>
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<tr>
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<th>File</th>
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<th>LLVM Pass Name</th>
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<th>LLVM IR Instruction</th>
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<th>Function Name</th>
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<th>Basic Block Name</th>
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<th>Action</th>
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<th>Origin</th>
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</tr>
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</tr>
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<tr>
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<td>test.ll</td>
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<td>LoopVectorizePass</td>
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<td>add</td>
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<td>fn</td>
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<td>no-name</td>
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<td>not-generate</td>
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<td><details><summary>View Origin StackTrace</summary><pre>Stack Trace 0:
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#0 0x00005895d035c935 llvm::DbgLocOrigin::DbgLocOrigin(bool) /tmp/llvm-project/llvm/lib/IR/DebugLoc.cpp:22:9
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#1 0x00005895d03af013 llvm::DILocAndCoverageTracking::DILocAndCoverageTracking() /tmp/llvm-project/llvm/include/llvm/IR/DebugLoc.h:90:11
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#2 0x00005895d03af013 llvm::DebugLoc::DebugLoc() /tmp/llvm-project/llvm/include/llvm/IR/DebugLoc.h:133:5
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#3 0x00005895d03af013 llvm::Instruction::Instruction(llvm::Type*, unsigned int, llvm::User::AllocInfo, llvm::InsertPosition) /tmp/llvm-project/llvm/lib/IR/Instruction.cpp:37:14
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#4 0x00005895d06862b5 llvm::PHINode::PHINode(llvm::Type*, unsigned int, llvm::Twine const&, llvm::InsertPosition) /tmp/llvm-project/llvm/include/llvm/IR/Instructions.h:0:9
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#5 0x00005895d06862b5 llvm::PHINode::Create(llvm::Type*, unsigned int, llvm::Twine const&, llvm::InsertPosition) /tmp/llvm-project/llvm/include/llvm/IR/Instructions.h:2651:9
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#6 0x00005895d06862b5 llvm::InstCombinerImpl::foldPHIArgGEPIntoPHI(llvm::PHINode&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp:617:9
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#7 0x00005895d0688fe0 llvm::InstCombinerImpl::visitPHINode(llvm::PHINode&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp:1456:22
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#8 0x00005895d05cd21f llvm::InstCombinerImpl::run() /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5327:22
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#9 0x00005895d05d067e combineInstructionsOverFunction(llvm::Function&, llvm::InstructionWorklist&, llvm::AAResults*, llvm::AssumptionCache&, llvm::TargetLibraryInfo&, llvm::TargetTransformInfo&, llvm::DominatorTree&, llvm::OptimizationRemarkEmitter&, llvm::BlockFrequencyInfo*, llvm::BranchProbabilityInfo*, llvm::ProfileSummaryInfo*, llvm::InstCombineOptions const&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5643:31
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#10 0x00005895d05cf9a9 llvm::InstCombinePass::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5706:8
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#11 0x00005895d107d07d llvm::detail::PassModel>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5
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#12 0x00005895d04204a7 llvm::PassManager>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerImpl.h:85:8
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#13 0x00005895ce4cb09d llvm::detail::PassModel>, llvm::AnalysisManager>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5
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#14 0x00005895cfae2865 llvm::CGSCCToFunctionPassAdaptor::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:0:38
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#15 0x00005895ce4cad5d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5
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#16 0x00005895cfade813 llvm::PassManager, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:93:12
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#17 0x00005895d1e3968d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::AnalysisManager, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5
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#18 0x00005895cfae1224 llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:0:38
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#19 0x00005895d1e5067d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5</pre></details></td>
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</tr>
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<tr>
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</table>
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<br>
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<table>
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<caption><b>Summary of Location Bugs</b></caption>
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<tr>
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<th>LLVM Pass Name</th>
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<th>Number of bugs</th>
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</tr>
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<tr>
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<td>LoopVectorizePass</td>
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<td>1</td>
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</tr>
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<tr>
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</table>
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<br>
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<br>
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<table>
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<caption><b>SP Bugs found by the Debugify</b></caption>
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<tr>
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<th>File</th>
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<th>LLVM Pass Name</th>
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<th>Function Name</th>
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<th>Action</th>
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</tr>
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<tr>
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<td colspan='4'> No bugs found </td>
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</tr>
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</table>
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<br>
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<table>
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<caption><b>Summary of SP Bugs</b></caption>
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<tr>
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<th>LLVM Pass Name</th>
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<th>Number of bugs</th>
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</tr>
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<tr>
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<tr>
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<td colspan='2'> No bugs found </td>
94+
</tr>
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</table>
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<br>
97+
<br>
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<table>
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<caption><b>Variable Location Bugs found by the Debugify</b></caption>
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<tr>
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<th>File</th>
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<th>LLVM Pass Name</th>
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<th>Variable</th>
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<th>Function</th>
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<th>Action</th>
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</tr>
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<tr>
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<td colspan='4'> No bugs found </td>
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</tr>
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</table>
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<br>
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<table>
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<caption><b>Summary of Variable Location Bugs</b></caption>
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<tr>
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<th>LLVM Pass Name</th>
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<th>Number of bugs</th>
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</tr>
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<tr>
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<tr>
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<td colspan='2'> No bugs found </td>
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</tr>
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</table>
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</body>
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</html>

‎llvm/test/tools/llvm-original-di-preservation/Inputs/expected-skipped.html

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<td>drop</td>
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</tr>
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<tr>
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</tr>
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<tr>
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<td>wrstabs.c</td>
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<td>Simplify the CFG</td>
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<td>tindex</td>
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<td>stab_bool_type</td>
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<td>drop</td>
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</tr>
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<tr>
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</tr>
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<tr>
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<td>prdbg.c</td>

‎llvm/test/tools/llvm-original-di-preservation/Inputs/origin.json

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{"file":"test.ll", "pass":"LoopVectorizePass", "bugs": [[{"action":"not-generate","bb-name":"no-name","fn-name":"fn","instr":"add","metadata":"DILocation", "origin": "Stack Trace 0:\n #0 0x00005895d035c935 llvm::DbgLocOrigin::DbgLocOrigin(bool) /tmp/llvm-project/llvm/lib/IR/DebugLoc.cpp:22:9\n #1 0x00005895d03af013 llvm::DILocAndCoverageTracking::DILocAndCoverageTracking() /tmp/llvm-project/llvm/include/llvm/IR/DebugLoc.h:90:11\n #2 0x00005895d03af013 llvm::DebugLoc::DebugLoc() /tmp/llvm-project/llvm/include/llvm/IR/DebugLoc.h:133:5\n #3 0x00005895d03af013 llvm::Instruction::Instruction(llvm::Type*, unsigned int, llvm::User::AllocInfo, llvm::InsertPosition) /tmp/llvm-project/llvm/lib/IR/Instruction.cpp:37:14\n #4 0x00005895d06862b5 llvm::PHINode::PHINode(llvm::Type*, unsigned int, llvm::Twine const&, llvm::InsertPosition) /tmp/llvm-project/llvm/include/llvm/IR/Instructions.h:0:9\n #5 0x00005895d06862b5 llvm::PHINode::Create(llvm::Type*, unsigned int, llvm::Twine const&, llvm::InsertPosition) /tmp/llvm-project/llvm/include/llvm/IR/Instructions.h:2651:9\n #6 0x00005895d06862b5 llvm::InstCombinerImpl::foldPHIArgGEPIntoPHI(llvm::PHINode&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp:617:9\n #7 0x00005895d0688fe0 llvm::InstCombinerImpl::visitPHINode(llvm::PHINode&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp:1456:22\n #8 0x00005895d05cd21f llvm::InstCombinerImpl::run() /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5327:22\n #9 0x00005895d05d067e combineInstructionsOverFunction(llvm::Function&, llvm::InstructionWorklist&, llvm::AAResults*, llvm::AssumptionCache&, llvm::TargetLibraryInfo&, llvm::TargetTransformInfo&, llvm::DominatorTree&, llvm::OptimizationRemarkEmitter&, llvm::BlockFrequencyInfo*, llvm::BranchProbabilityInfo*, llvm::ProfileSummaryInfo*, llvm::InstCombineOptions const&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5643:31\n#10 0x00005895d05cf9a9 llvm::InstCombinePass::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp:5706:8\n#11 0x00005895d107d07d llvm::detail::PassModel>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5\n#12 0x00005895d04204a7 llvm::PassManager>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerImpl.h:85:8\n#13 0x00005895ce4cb09d llvm::detail::PassModel>, llvm::AnalysisManager>::run(llvm::Function&, llvm::AnalysisManager&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5\n#14 0x00005895cfae2865 llvm::CGSCCToFunctionPassAdaptor::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:0:38\n#15 0x00005895ce4cad5d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5\n#16 0x00005895cfade813 llvm::PassManager, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:93:12\n#17 0x00005895d1e3968d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::AnalysisManager, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5\n#18 0x00005895cfae1224 llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/lib/Analysis/CGSCCPassManager.cpp:0:38\n#19 0x00005895d1e5067d llvm::detail::PassModel, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&, llvm::AnalysisManager&, llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&) /tmp/llvm-project/llvm/include/llvm/IR/PassManagerInternal.h:91:5"}]]}

‎llvm/test/tools/llvm-original-di-preservation/basic.test

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RUN: %llvm-original-di-preservation %p/Inputs/sample.json %t.html | FileCheck %s
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RUN: diff -w %p/Inputs/expected-sample.html %t.html
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CHECK: The {{.+}}.html generated.
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CHECK-NOT: Skipped lines:
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RUN: %llvm-original-di-preservation %p/Inputs/corrupted.json %t2.html | FileCheck %s -check-prefix=CORRUPTED
@@ -9,5 +10,8 @@ CORRUPTED: Skipped bugs: 1
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RUN: %llvm-original-di-preservation -compress %p/Inputs/sample.json %t3.html | FileCheck %s -check-prefix=COMPRESSED
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RUN: diff -w %p/Inputs/expected-compressed.html %t3.html
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COMPRESSED: The {{.+}}.html generated.
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COMPRESSED-NOT: Skipped lines:
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RUN: %llvm-original-di-preservation %p/Inputs/origin.json %t4.html | FileCheck %s
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RUN: diff -w %p/Inputs/expected-origin.html %t4.html

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