[BOLT][print] Add option '--print-only-file' (NFC) (#168023)

With this option we can pass to BOLT names of functions to be printed
through a file instead of specifying them all on command line.

bolt/include/bolt/Rewrite/RewriteInstance.h

@@ -139,6 +139,9 @@ private:
   void handleRelocation(const object::SectionRef &RelocatedSection,
                         const RelocationRef &Rel);
 
+  /// Collect functions that are specified to be bumped.
+  void selectFunctionsToPrint();
+
   /// Mark functions that are not meant for processing as ignored.
   void selectFunctionsToProcess();
 

bolt/lib/Core/BinaryFunction.cpp

@@ -61,6 +61,8 @@ extern cl::OptionCategory BoltOptCategory;
 
 extern cl::opt<bool> EnableBAT;
 extern cl::opt<bool> Instrument;
+extern cl::list<std::string> PrintOnly;
+extern cl::opt<std::string> PrintOnlyFile;
 extern cl::opt<bool> StrictMode;
 extern cl::opt<bool> UpdateDebugSections;
 extern cl::opt<unsigned> Verbosity;
@@ -133,14 +135,6 @@ PrintDynoStatsOnly("print-dyno-stats-only",
   cl::Hidden,
   cl::cat(BoltCategory));
 
-static cl::list<std::string>
-PrintOnly("print-only",
-  cl::CommaSeparated,
-  cl::desc("list of functions to print"),
-  cl::value_desc("func1,func2,func3,..."),
-  cl::Hidden,
-  cl::cat(BoltCategory));
-
 cl::opt<bool>
     TimeBuild("time-build",
               cl::desc("print time spent constructing binary functions"),

bolt/lib/Rewrite/RewriteInstance.cpp

@@ -82,6 +82,8 @@ extern cl::opt<bool> Hugify;
 extern cl::opt<bool> Instrument;
 extern cl::opt<bool> KeepNops;
 extern cl::opt<bool> Lite;
+extern cl::list<std::string> PrintOnly;
+extern cl::opt<std::string> PrintOnlyFile;
 extern cl::list<std::string> ReorderData;
 extern cl::opt<bolt::ReorderFunctions::ReorderType> ReorderFunctions;
 extern cl::opt<bool> TerminalHLT;
@@ -730,6 +732,8 @@ Error RewriteInstance::run() {
              << "\n";
   BC->outs() << "BOLT-INFO: BOLT version: " << BoltRevision << "\n";
 
+  selectFunctionsToPrint();
+
   if (Error E = discoverStorage())
     return E;
   if (Error E = readSpecialSections())
@@ -3100,17 +3104,22 @@ static BinaryFunction *getInitFunctionIfStaticBinary(BinaryContext &BC) {
   return BC.getBinaryFunctionAtAddress(BD->getAddress());
 }
 
+static void populateFunctionNames(cl::opt<std::string> &FunctionNamesFile,
+                                  cl::list<std::string> &FunctionNames) {
+  if (FunctionNamesFile.empty())
+    return;
+  std::ifstream FuncsFile(FunctionNamesFile, std::ios::in);
+  std::string FuncName;
+  while (std::getline(FuncsFile, FuncName))
+    FunctionNames.push_back(FuncName);
+}
+
+void RewriteInstance::selectFunctionsToPrint() {
+  populateFunctionNames(opts::PrintOnlyFile, opts::PrintOnly);
+}
+
 void RewriteInstance::selectFunctionsToProcess() {
   // Extend the list of functions to process or skip from a file.
-  auto populateFunctionNames = [](cl::opt<std::string> &FunctionNamesFile,
-                                  cl::list<std::string> &FunctionNames) {
-    if (FunctionNamesFile.empty())
-      return;
-    std::ifstream FuncsFile(FunctionNamesFile, std::ios::in);
-    std::string FuncName;
-    while (std::getline(FuncsFile, FuncName))
-      FunctionNames.push_back(FuncName);
-  };
   populateFunctionNames(opts::FunctionNamesFile, opts::ForceFunctionNames);
   populateFunctionNames(opts::SkipFunctionNamesFile, opts::SkipFunctionNames);
   populateFunctionNames(opts::FunctionNamesFileNR, opts::ForceFunctionNamesNR);

bolt/lib/Utils/CommandLineOpts.cpp

@@ -245,6 +245,16 @@ cl::opt<bool> PrintCacheMetrics(
     cl::desc("calculate and print various metrics for instruction cache"),
     cl::cat(BoltOptCategory));
 
+cl::list<std::string> PrintOnly("print-only", cl::CommaSeparated,
+                                cl::desc("list of functions to print"),
+                                cl::value_desc("func1,func2,func3,..."),
+                                cl::Hidden, cl::cat(BoltCategory));
+
+cl::opt<std::string>
+    PrintOnlyFile("print-only-file",
+                  cl::desc("file with list of functions to print"), cl::Hidden,
+                  cl::cat(BoltCategory));
+
 cl::opt<bool> PrintSections("print-sections",
                             cl::desc("print all registered sections"),
                             cl::Hidden, cl::cat(BoltCategory));

bolt/test/print-only.test

@@ -0,0 +1,25 @@
+# Verify if `--print-only` and `--print-only-files` work fine.
+
+# REQUIRES: system-linux
+
+# RUN: %clang %cflags -x c %p/Inputs/bolt_icf.cpp -o %t -Wl,-q
+# RUN: llvm-bolt %t -o %t.bolt --icf=none --print-cfg \
+# RUN:     --print-only=foo.*,bar.*,main.* 2>&1 | FileCheck %s
+
+# RUN: echo "bar.*" > %t.pof
+# RUN: echo "main.*" >> %t.pof
+# RUN: llvm-bolt %t -o %t.bolt --icf=none --print-cfg \
+# RUN:     --print-only=foo.* --print-only-file=%t.pof \
+# RUN:     2>&1 | FileCheck %s
+
+# RUN: echo "foo.*" >> %t.pof
+# RUN: llvm-bolt %t -o %t.bolt --icf=none --print-cfg \
+# RUN:     --print-only-file=%t.pof 2>&1 | FileCheck %s
+
+# CHECK-NOT: Binary Function "fiz" after building cfg
+# CHECK-NOT: Binary Function "faz" after building cfg
+# CHECK-NOT: Binary Function "zip" after building cfg
+# CHECK-NOT: Binary Function "zap" after building cfg
+# CHECK: Binary Function "foo" after building cfg
+# CHECK: Binary Function "bar" after building cfg
+# CHECK: Binary Function "main" after building cfg