[ThinLTO] Add option to dump per-module summary dot graph
Summary:
I found that there currently isn't a way to invoke exportToDot from
the command line for a per-module summary index, and therefore no
testing of that case. Add an internal option and use it to test dumping
of per module summary indexes.
In particular, I am looking at fixing the limitation that causes the
aliasee GUID in the per-module summary to be 0, and want to be able to
test that change.
Reviewers: evgeny777
Subscribers: mehdi_amini, inglorion, eraman, steven_wu, dexonsmith, llvm-commits
Differential Revision: https://reviews.llvm.org/D57206
llvm-svn: 352441
diff --git a/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp b/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
index 76a0b04..58bf469 100644
--- a/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
+++ b/llvm/lib/Analysis/ModuleSummaryAnalysis.cpp
@@ -70,6 +70,11 @@
"all-non-critical", "All non-critical edges."),
clEnumValN(FunctionSummary::FSHT_All, "all", "All edges.")));
+cl::opt<std::string> ModuleSummaryDotFile(
+ "module-summary-dot-file", cl::init(""), cl::Hidden,
+ cl::value_desc("filename"),
+ cl::desc("File to emit dot graph of new summary into."));
+
// Walk through the operands of a given User via worklist iteration and populate
// the set of GlobalValue references encountered. Invoked either on an
// Instruction or a GlobalVariable (which walks its initializer).
@@ -625,6 +630,15 @@
}
}
+ if (!ModuleSummaryDotFile.empty()) {
+ std::error_code EC;
+ raw_fd_ostream OSDot(ModuleSummaryDotFile, EC, sys::fs::OpenFlags::F_None);
+ if (EC)
+ report_fatal_error(Twine("Failed to open dot file ") +
+ ModuleSummaryDotFile + ": " + EC.message() + "\n");
+ Index.exportToDot(OSDot);
+ }
+
return Index;
}