[llvm-lipo] Implement -replace

[anushabasana]

Summary

Replaces specified architecture in universal binary input file with slice from the file_name argument passed into the replace command.

Test Plan: check-llvm

[alexander-shaposhnikov]

llvm/tools/llvm-lipo/llvm-lipo.cpp

622

auto It  = ReplacementSlices.find(...)

[alexander-shaposhnikov]

LG

[anushabasana]

rename var

llvm/test/tools/llvm-lipo/Inputs/armv7-slice-big.yaml

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llvm/test/tools/llvm-lipo/replace-invalid-input.test

+# RUN: yaml2obj %p/Inputs/i386-slice.yaml > %t-32.o
+# RUN: yaml2obj %p/Inputs/arm64-slice.yaml > %t-arm64.o
+# RUN: yaml2obj %p/Inputs/i386-x86_64-universal.yaml > %t-universal.o
+
+# RUN: not llvm-lipo %t-universal.o -replace %t-32.o 2>&1 | FileCheck --check-prefix=MISSING_ARG %s
+# MISSING_ARG: error: replace is missing an argument: expects -replace arch_type file_name
+
+# RUN: not llvm-lipo %t-universal.o -replace %t-32.o i386 2>&1 | FileCheck --check-prefix=OUTPUT_FILE %s
+# OUTPUT_FILE: error: replace expects a single output file to be specified
+
+# RUN: not llvm-lipo %t-universal.o %t-universal.o -replace %t-32.o i386 -o %t.o 2>&1 | FileCheck --check-prefix=INPUT_ARGS %s
+# INPUT_ARGS: error: replace expects a single input file
+
+# RUN: not llvm-lipo %t-universal.o -replace %t-32.o i386 -o %t.o 2>&1 | FileCheck --check-prefix=INVALID_FILE %s
+# INVALID_FILE: error: 'i386': No such file or directory
+
+# RUN: not llvm-lipo %t-universal.o -replace i3866 %t-32.o -o %t.o 2>&1 | FileCheck --check-prefix=INVALID_ARCH %s
+# INVALID_ARCH: error: Invalid architecture: i3866
+
+# RUN: not llvm-lipo %t-universal.o -replace arm64 %t-32.o -o %t.o 2>&1 | FileCheck --check-prefix=ARCH_NOT_MATCHED %s
+# ARCH_NOT_MATCHED: error: specified architecture: arm64 for replacement file: {{.*}} does not match the file's architecture
+
+# RUN: not llvm-lipo %t-universal.o -replace arm64 %t-arm64.o -o %t.o 2>&1 | FileCheck --check-prefix=ARCH_NOT_IN_INPUT %s
+# ARCH_NOT_IN_INPUT: error: -replace arm64 <file_name> specified but fat file: {{.*}} does not contain that architecture
+
+# RUN: not llvm-lipo %t-universal.o -replace i386 %t-32.o -replace arm64 %t-universal.o -o %t.o 2>&1 | FileCheck --check-prefix=REPLACE_UNIVERSAL %s
+# REPLACE_UNIVERSAL: replacement file: {{.*}} is a fat file (must be a thin file)
+
+# RUN: not llvm-lipo %t-universal.o -replace i386 %t-32.o -replace i386 %t-32.o -o %t.o 2>&1 | FileCheck --check-prefix=ARCH_DUPLICATE %s
+# ARCH_DUPLICATE: error: -replace i386 <file_name> specified multiple times:

llvm/test/tools/llvm-lipo/replace-universal-binary.test

+# RUN: yaml2obj %p/Inputs/armv7-slice-big.yaml > %t-armv7big.o
+# RUN: yaml2obj %p/Inputs/i386-x86_64-armv7-arm64-universal.yaml > %t-universal.o
+
+# RUN: llvm-lipo %t-universal.o -replace armv7 %t-armv7big.o -o %t.o
+# RUN: llvm-objdump %t.o -m --universal-headers | FileCheck --check-prefix=ARMV7_BIG %s
+# RUN: llvm-lipo %t.o -thin armv7 -o %t-armv7-out.o
+# RUN: cmp %t-armv7big.o %t-armv7-out.o
+# ARMV7_BIG: architecture i386
+# ARMV7_BIG: offset 4096
+# ARMV7_BIG: align 2^12 (4096)
+# ARMV7_BIG-NEXT: architecture x86_64
+# ARMV7_BIG: offset 8192
+# ARMV7_BIG: align 2^12 (4096)
+# ARMV7_BIG-NEXT: architecture armv7
+# ARMV7_BIG: offset 16384
+# ARMV7_BIG: size 88128
+# ARMV7_BIG: align 2^14 (16384)
+# ARMV7_BIG-NEXT: architecture arm64
+# ARMV7_BIG: offset 114688
+# ARMV7_BIG: size 516
+# ARMV7_BIG: align 2^14 (16384)
+
+# RUN: yaml2obj %p/Inputs/armv7-slice.yaml > %t-armv7.o
+# RUN: yaml2obj %p/Inputs/armv7_i386_non_default_alignment.yaml > %t-universal-align.o
+
+# RUN: llvm-lipo %t-universal-align.o -replace armv7 %t-armv7.o -o %t2.o
+# RUN: llvm-objdump %t2.o -m --universal-headers | FileCheck --check-prefix=ARMV7_ALIGN_SWAP %s
+# RUN: llvm-lipo %t2.o -thin armv7 -o %t-armv7-out2.o
+# RUN: cmp %t-armv7.o %t-armv7-out2.o
+# ARMV7_ALIGN_SWAP: architecture i386
+# ARMV7_ALIGN_SWAP: offset 4096
+# ARMV7_ALIGN_SWAP: align 2^12 (4096)
+# ARMV7_ALIGN_SWAP-NEXT: architecture armv7
+# ARMV7_ALIGN_SWAP: offset 16384
+# ARMV7_ALIGN_SWAP: align 2^14 (16384)

llvm/tools/llvm-lipo/LipoOpts.td

def thin : Option<["-", "--"], "thin", KIND_SEPARATE>,
            HelpText<"Create a thin output file of specified arch_type from the "
                     "fat input file. Requires -output option">;
 
 def create : Option<["-", "--"], "create", KIND_FLAG>,
              Group<action_group>,
              HelpText<"Create a universal binary output file from the input "
                       "files. Requires -output option">;
 
+def replace
+    : MultiArg<["-", "--"], "replace", 2>,
+      Group<action_group>,
+      HelpText<"Replace the specified arch type with the contents of the "
+               "input_file in a universal binary. Requires -output option">;
+
 def output : Option<["-", "--"], "output", KIND_SEPARATE>,
              HelpText<"Create output file with specified name">;
 def o : JoinedOrSeparate<["-"], "o">, Alias<output>;

llvm/tools/llvm-lipo/llvm-lipo.cpp

public:
   LipoOptTable() : OptTable(LipoInfoTable) {}
 };
 
 enum class LipoAction {
   PrintArchs,
   VerifyArch,
   ThinArch,
   CreateUniversal,
+  ReplaceArch,
+};
+
+struct Replacement {
+  StringRef ArchType;
+  StringRef FileName;
 };
 
 struct Config {
   SmallVector<std::string, 1> InputFiles;
   SmallVector<std::string, 1> VerifyArchList;
+  SmallVector<Replacement, 1> Replacements;
   std::string ThinArchType;
   std::string OutputFile;
   LipoAction ActionToPerform;
 };
 
 struct Slice {
   const MachOObjectFile *ObjectFile;
   // Requires Alignment field to store slice alignment values from universal
if (C.InputFiles.empty())
     reportError("at least one input file should be specified");
 
   if (InputArgs.hasArg(LIPO_output))
     C.OutputFile = InputArgs.getLastArgValue(LIPO_output);
 
   SmallVector<opt::Arg *, 1> ActionArgs(InputArgs.filtered(LIPO_action_group));
   if (ActionArgs.empty())
     reportError("at least one action should be specified");
-  if (ActionArgs.size() > 1) {
+  // errors if multiple actions specified other than replace
+  // multiple replace flags may be specified, as long as they are not mixed with
+  // other action flags
+  auto ReplacementArgsRange = InputArgs.filtered(LIPO_replace);
+  if (ActionArgs.size() > 1 &&
+      ActionArgs.size() !=
+          static_cast<size_t>(std::distance(ReplacementArgsRange.begin(),
+                                            ReplacementArgsRange.end()))) {
     std::string Buf;
     raw_string_ostream OS(Buf);
     OS << "only one of the following actions can be specified:";
     for (auto Arg : ActionArgs)
       OS << " " << Arg->getSpelling();
     reportError(OS.str());
   }
 
case LIPO_thin:
     return C;
 
   case LIPO_create:
     if (C.OutputFile.empty())
       reportError("create expects a single output file to be specified");
     C.ActionToPerform = LipoAction::CreateUniversal;
     return C;
 
+  case LIPO_replace:
+    for (auto Action : ActionArgs) {
+      if (!Action->getValue(1))
+        reportError(
+            "replace is missing an argument: expects -replace arch_type "
+            "file_name");
+      C.Replacements.push_back(
+          Replacement{Action->getValue(0), Action->getValue(1)});
+    }
+
+    if (C.OutputFile.empty())
+      reportError("replace expects a single output file to be specified");
+    if (C.InputFiles.size() > 1)
+      reportError("replace expects a single input file");
+    C.ActionToPerform = LipoAction::ReplaceArch;
+    return C;
+
   default:
     reportError("llvm-lipo action unspecified");
   }
 }
 
 static SmallVector<OwningBinary<Binary>, 1>
 readInputBinaries(ArrayRef<std::string> InputFiles) {
   SmallVector<OwningBinary<Binary>, 1> InputBinaries;
static void createUniversalBinary(ArrayRef<OwningBinary<Binary>> InputBinaries,
   SmallVector<std::unique_ptr<MachOObjectFile>, 1> ExtractedObjects;
   SmallVector<Slice, 1> Slices = buildSlices(InputBinaries, ExtractedObjects);
   checkArchDuplicates(Slices);
   createUniversalBinary(Slices, OutputFileName);
 
   exit(EXIT_SUCCESS);
 }
 
+static StringMap<Slice>
+buildReplacementSlices(ArrayRef<OwningBinary<Binary>> ReplacementBinaries,
+                       ArrayRef<Replacement> Replacements) {
+  assert(ReplacementBinaries.size() == Replacements.size() &&
+         "Number of replacment binaries does not match the number of "
+         "replacements");
+  StringMap<Slice> Slices;
+  // populates StringMap of slices to replace with; error checks for mismatched
+  // replace flag args, fat files, and duplicate arch_types
+  for (size_t Index = 0, Size = Replacements.size(); Index < Size; ++Index) {
+    StringRef ReplacementArch = Replacements[Index].ArchType;
+    const Binary *ReplacementBinary = ReplacementBinaries[Index].getBinary();
+    validateArchitectureName(ReplacementArch);
+
+    auto O = dyn_cast<MachOObjectFile>(ReplacementBinary);
+    if (!O)
+      reportError("replacement file: " + ReplacementBinary->getFileName() +
+                  " is a fat file (must be a thin file)");
+
+    if (O->getArch() != Triple(ReplacementArch).getArch())
+      reportError("specified architecture: " + ReplacementArch +
+                  " for replacement file: " + ReplacementBinary->getFileName() +
+                  " does not match the file's architecture");
+
+    auto Entry =
+        Slices.try_emplace(ReplacementArch, Slice{O, calculateAlignment(O)});
+    if (!Entry.second)
+      reportError("-replace " + ReplacementArch +
+                  " <file_name> specified multiple times: " +
+                  Entry.first->second.ObjectFile->getFileName() + ", " +
+                  O->getFileName());
+  }
+  return Slices;
+}
+
+LLVM_ATTRIBUTE_NORETURN
+static void replaceSlices(ArrayRef<OwningBinary<Binary>> InputBinaries,
+                          StringRef OutputFileName,
+                          ArrayRef<Replacement> Replacements) {
+  assert(InputBinaries.size() == 1 && "Incorrect number of input binaries");
+  assert(!OutputFileName.empty() && "Replace expects a single output file");
+
+  if (InputBinaries.front().getBinary()->isMachO())
+    reportError("input file " +
+                InputBinaries.front().getBinary()->getFileName() +
+                " must be a fat file when the -replace option is specified");
+
+  SmallVector<std::string, 1> ReplacementFiles;
+  for (const auto &R : Replacements)
+    ReplacementFiles.push_back(R.FileName);
+  SmallVector<OwningBinary<Binary>, 1> ReplacementBinaries =
+      readInputBinaries(ReplacementFiles);
+
+  StringMap<Slice> ReplacementSlices =
+      buildReplacementSlices(ReplacementBinaries, Replacements);
+  SmallVector<std::unique_ptr<MachOObjectFile>, 2> ExtractedObjects;
+  SmallVector<Slice, 2> Slices = buildSlices(InputBinaries, ExtractedObjects);
+
+  for (auto &Slice : Slices) {
+    auto Replace = ReplacementSlices.find(getArchString(*Slice.ObjectFile));
+    if (Replace != ReplacementSlices.end()) {
+      Slice = Replace->second;
+      ReplacementSlices.erase(Replace); // keep remaining replacing arch_types
+    }
+  }
+
+  if (!ReplacementSlices.empty())
+    reportError("-replace " + ReplacementSlices.begin()->first() +
+                " <file_name> specified but fat file: " +
+                InputBinaries.front().getBinary()->getFileName() +
+                " does not contain that architecture");
+  createUniversalBinary(Slices, OutputFileName);
+  exit(EXIT_SUCCESS);
+}
+
 int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
   Config C = parseLipoOptions(makeArrayRef(argv + 1, argc));
   SmallVector<OwningBinary<Binary>, 1> InputBinaries =
       readInputBinaries(C.InputFiles);
 
   switch (C.ActionToPerform) {
   case LipoAction::VerifyArch:
     verifyArch(InputBinaries, C.VerifyArchList);
     break;
   case LipoAction::PrintArchs:
     printArchs(InputBinaries);
     break;
   case LipoAction::ThinArch:
     extractSlice(InputBinaries, C.ThinArchType, C.OutputFile);
     break;
   case LipoAction::CreateUniversal:
     createUniversalBinary(InputBinaries, C.OutputFile);
     break;
+  case LipoAction::ReplaceArch:
+    replaceSlices(InputBinaries, C.OutputFile, C.Replacements);
+    break;
   }
   return EXIT_SUCCESS;
 }