[llvm] [NewPM] Add pass options for `InternalizePass` to preserve GVs. (PR #91334)

[Tim Besard via llvm-commits]

https://github.com/maleadt created https://github.com/llvm/llvm-project/pull/91334

This PR adds a string interface to `InternalizePass`' `MustPreserveGV` option, which is a callback function to indicate if a GV is not to be internalized. This is for use in LLVM.jl, the Julia wrapper for LLVM, which uses the C API and is thus required to use the PassBuilder string API for building NewPM pipelines.

>From 5c086c6364e8ece8d5fcc2356ae3955ed106a1a4 Mon Sep 17 00:00:00 2001
From: Tim Besard <tim.besard at gmail.com>
Date: Tue, 7 May 2024 16:09:23 +0200
Subject: [PATCH] [NewPM] Add pass options for `InternalizePass` to preserve
 GVs.

---
 llvm/lib/Passes/PassBuilder.cpp           | 18 ++++++++++++++++++
 llvm/lib/Passes/PassRegistry.def          | 15 ++++++++++++++-
 llvm/test/Transforms/Internalize/lists.ll |  5 +++++
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 51ddb73943b10d..1f9c4000ae3d86 100644
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -1141,6 +1141,24 @@ Expected<GlobalMergeOptions> parseGlobalMergeOptions(StringRef Params) {
   return Result;
 }
 
+Expected<SmallVector<std::string, 0>> parseInternalizeGVs(StringRef Params) {
+  SmallVector<std::string, 1> PreservedGVs;
+  while (!Params.empty()) {
+    StringRef ParamName;
+    std::tie(ParamName, Params) = Params.split(';');
+
+    if (ParamName.consume_front("preserve-gv=")) {
+      PreservedGVs.push_back(ParamName.str());
+    } else {
+      return make_error<StringError>(
+          formatv("invalid Internalize pass parameter '{0}' ", ParamName).str(),
+          inconvertibleErrorCode());
+    }
+  }
+
+  return PreservedGVs;
+}
+
 } // namespace
 
 /// Tests whether a pass name starts with a valid prefix for a default pipeline
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
index 6864f307e56cf4..ea6b065a322fff 100644
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -77,7 +77,6 @@ MODULE_PASS("inliner-wrapper-no-mandatory-first",
 MODULE_PASS("insert-gcov-profiling", GCOVProfilerPass())
 MODULE_PASS("instrorderfile", InstrOrderFilePass())
 MODULE_PASS("instrprof", InstrProfilingLoweringPass())
-MODULE_PASS("internalize", InternalizePass())
 MODULE_PASS("invalidate<all>", InvalidateAllAnalysesPass())
 MODULE_PASS("iroutliner", IROutlinerPass())
 MODULE_PASS("jmc-instrumenter", JMCInstrumenterPass())
@@ -199,6 +198,20 @@ MODULE_PASS_WITH_PARAMS(
       return StructuralHashPrinterPass(dbgs(), EnableDetailedStructuralHash);
     },
     parseStructuralHashPrinterPassOptions, "detailed")
+MODULE_PASS_WITH_PARAMS(
+    "internalize", "InternalizePass",
+    [](SmallVector<std::string, 0> PreservedGVs) {
+      if (PreservedGVs.empty())
+        return InternalizePass();
+      auto MustPreserveGV = [=](const GlobalValue &GV) {
+        for (auto &PreservedGV : PreservedGVs)
+          if (GV.getName() == PreservedGV)
+            return true;
+        return false;
+      };
+      return InternalizePass(MustPreserveGV);
+    },
+    parseInternalizeGVs, "preserve-gv=GV")
 #undef MODULE_PASS_WITH_PARAMS
 
 #ifndef CGSCC_ANALYSIS
diff --git a/llvm/test/Transforms/Internalize/lists.ll b/llvm/test/Transforms/Internalize/lists.ll
index df408f906b7806..83dad03d75eae1 100644
--- a/llvm/test/Transforms/Internalize/lists.ll
+++ b/llvm/test/Transforms/Internalize/lists.ll
@@ -13,6 +13,11 @@
 ; -file and -list options should be merged, the apifile contains foo and j
 ; RUN: opt < %s -passes=internalize -internalize-public-api-list bar -internalize-public-api-file %S/apifile -S | FileCheck --check-prefix=FOO_J_AND_BAR %s
 
+; specifying through pass builder option
+; RUN: opt < %s -passes='internalize<preserve-gv=foo;preserve-gv=j>' -S | FileCheck --check-prefix=FOO_AND_J %s
+; RUN: opt < %s -passes='internalize<preserve-gv=foo;preserve-gv=bar>' -S | FileCheck --check-prefix=FOO_AND_BAR %s
+; RUN: opt < %s -passes='internalize<preserve-gv=foo;preserve-gv=j;preserve-gv=bar>' -S | FileCheck --check-prefix=FOO_J_AND_BAR %s
+
 ; ALL: @i = internal global
 ; FOO_AND_J: @i = internal global
 ; FOO_AND_BAR: @i = internal global