[llvm-reduce] Remove unwanted module inline asm

[aeubanks]

Summary

We can clear line by line, but that's likely not very important.

[aeubanks]

add TODO

llvm/test/tools/llvm-reduce/remove-module-inline-asm.ll

+; RUN: llvm-reduce --test FileCheck --test-arg --check-prefixes=CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t
+; RUN: FileCheck --check-prefix=CHECK-FINAL %s < %t
+
+; CHECK-INTERESTINGNESS: declare
+
+; CHECK-FINAL-NOT: module asm
+; CHECK-FINAL: declare void @g
+
+module asm "foo"
+
+declare void @g()

llvm/tools/llvm-reduce/CMakeLists.txt

add_llvm_tool(llvm-reduce
   deltas/ReduceBasicBlocks.cpp
   deltas/ReduceFunctionBodies.cpp
   deltas/ReduceFunctions.cpp
   deltas/ReduceGlobalValues.cpp
   deltas/ReduceGlobalVarInitializers.cpp
   deltas/ReduceGlobalVars.cpp
   deltas/ReduceInstructions.cpp
   deltas/ReduceMetadata.cpp
+  deltas/ReduceModuleInlineAsm.cpp
   deltas/ReduceOperandBundles.cpp
   deltas/ReduceSpecialGlobals.cpp
   llvm-reduce.cpp
 
   DEPENDS
   intrinsics_gen
   )

llvm/tools/llvm-reduce/DeltaManager.cpp

 #include "deltas/ReduceBasicBlocks.h"
 #include "deltas/ReduceFunctionBodies.h"
 #include "deltas/ReduceFunctions.h"
 #include "deltas/ReduceGlobalValues.h"
 #include "deltas/ReduceGlobalVarInitializers.h"
 #include "deltas/ReduceGlobalVars.h"
 #include "deltas/ReduceInstructions.h"
 #include "deltas/ReduceMetadata.h"
+#include "deltas/ReduceModuleInlineAsm.h"
 #include "deltas/ReduceOperandBundles.h"
 #include "deltas/ReduceSpecialGlobals.h"
 
 namespace llvm {
 
 // TODO: Add CLI option to run only specified Passes (for unit tests)
 void runDeltaPasses(TestRunner &Tester) {
   reduceSpecialGlobalsDeltaPass(Tester);
   reduceAliasesDeltaPass(Tester);
   reduceFunctionBodiesDeltaPass(Tester);
   reduceFunctionsDeltaPass(Tester);
   reduceBasicBlocksDeltaPass(Tester);
   reduceGlobalValuesDeltaPass(Tester);
   reduceGlobalsInitializersDeltaPass(Tester);
   reduceGlobalsDeltaPass(Tester);
   reduceMetadataDeltaPass(Tester);
   reduceArgumentsDeltaPass(Tester);
   reduceInstructionsDeltaPass(Tester);
   reduceOperandBundesDeltaPass(Tester);
   reduceAttributesDeltaPass(Tester);
+  reduceModuleInlineAsmDeltaPass(Tester);
   // TODO: Implement the remaining Delta Passes
 }
-} // namespace llvm
+} // namespace llvm
 

llvm/tools/llvm-reduce/deltas/ReduceModuleInlineAsm.h

+//===- ReduceModuleInlineAsm.h --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_REDUCE_DELTAS_REDUCE_MODULEINLINEASM_H
+#define LLVM_TOOLS_LLVM_REDUCE_DELTAS_REDUCE_MODULEINLINEASM_H
+
+#include "Delta.h"
+
+namespace llvm {
+void reduceModuleInlineAsmDeltaPass(TestRunner &Test);
+} // namespace llvm
+
+#endif

llvm/tools/llvm-reduce/deltas/ReduceModuleInlineAsm.cpp

+//===- ReduceModuleInlineAsm.cpp ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a function which calls the Generic Delta pass to reduce
+// module inline asm.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ReduceModuleInlineAsm.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/GlobalValue.h"
+
+using namespace llvm;
+
+static void clearModuleInlineAsm(std::vector<Chunk> ChunksToKeep,
+                                 Module *Program) {
+  Oracle O(ChunksToKeep);
+
+  // TODO: clear line by line rather than all at once
+  if (!O.shouldKeep())
+    Program->setModuleInlineAsm("");
+}
+
+void llvm::reduceModuleInlineAsmDeltaPass(TestRunner &Test) {
+  outs() << "*** Reducing Module Inline Asm...\n";
+  runDeltaPass(Test, 1, clearModuleInlineAsm);
+}

llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn

sources = [
     "deltas/ReduceBasicBlocks.cpp",
     "deltas/ReduceFunctionBodies.cpp",
     "deltas/ReduceFunctions.cpp",
     "deltas/ReduceGlobalValues.cpp",
     "deltas/ReduceGlobalVarInitializers.cpp",
     "deltas/ReduceGlobalVars.cpp",
     "deltas/ReduceInstructions.cpp",
     "deltas/ReduceMetadata.cpp",
+    "deltas/ReduceModuleInlineAsm.cpp",
     "deltas/ReduceOperandBundles.cpp",
     "deltas/ReduceSpecialGlobals.cpp",
     "llvm-reduce.cpp",
   ]
 }