[llvm-cov] Allow specifying distinct architectures for each loaded binary

The coverage tool needs to know which slice to look at when it's handed
a universal binary. Some projects need to look at aggregate coverage
reports for a variety of slices in different binaries: this patch adds
support for these kinds of projects to llvm-cov.

rdar://problem/33579007

llvm-svn: 309747

docs/CommandGuide/llvm-cov.rst

@@ -222,12 +222,13 @@ OPTIONS
 
  Enable or disable color output. By default this is autodetected.
 
-.. option:: -arch=<name>
+.. option:: -arch=[*NAMES*]
 
- If the covered binary is a universal binary, select the architecture to use.
- It is an error to specify an architecture that is not included in the
- universal binary or to use an architecture that does not match a
- non-universal binary.
+ Specify a list of architectures such that the Nth entry in the list
+ corresponds to the Nth specified binary. If the covered object is a universal
+ binary, this specifies the architecture to use. It is an error to specify an
+ architecture that is not included in the universal binary or to use an
+ architecture that does not match a non-universal binary.
 
 .. option:: -name=<NAME>
 

include/llvm/ProfileData/Coverage/CoverageMapping.h

@@ -449,14 +449,16 @@ public:
   CoverageMapping(const CoverageMapping &) = delete;
   CoverageMapping &operator=(const CoverageMapping &) = delete;
 
-  /// \brief Load the coverage mapping using the given readers.
+  /// Load the coverage mapping using the given readers.
   static Expected<std::unique_ptr<CoverageMapping>>
   load(ArrayRef<std::unique_ptr<CoverageMappingReader>> CoverageReaders,
        IndexedInstrProfReader &ProfileReader);
 
+  /// Load the coverage mapping from the given object files and profile. If
+  /// \p Arches is non-empty, it must specify an architecture for each object.
   static Expected<std::unique_ptr<CoverageMapping>>
   load(ArrayRef<StringRef> ObjectFilenames, StringRef ProfileFilename,
-       StringRef Arch = StringRef());
+       ArrayRef<StringRef> Arches = None);
 
   /// \brief The number of functions that couldn't have their profiles mapped.
   ///

lib/ProfileData/Coverage/CoverageMapping.cpp

@@ -260,7 +260,7 @@ Expected<std::unique_ptr<CoverageMapping>> CoverageMapping::load(
 
 Expected<std::unique_ptr<CoverageMapping>>
 CoverageMapping::load(ArrayRef<StringRef> ObjectFilenames,
-                      StringRef ProfileFilename, StringRef Arch) {
+                      StringRef ProfileFilename, ArrayRef<StringRef> Arches) {
   auto ProfileReaderOrErr = IndexedInstrProfReader::create(ProfileFilename);
   if (Error E = ProfileReaderOrErr.takeError())
     return std::move(E);
@@ -268,10 +268,11 @@ CoverageMapping::load(ArrayRef<StringRef> ObjectFilenames,
 
   SmallVector<std::unique_ptr<CoverageMappingReader>, 4> Readers;
   SmallVector<std::unique_ptr<MemoryBuffer>, 4> Buffers;
-  for (StringRef ObjectFilename : ObjectFilenames) {
-    auto CovMappingBufOrErr = MemoryBuffer::getFileOrSTDIN(ObjectFilename);
+  for (const auto &File : llvm::enumerate(ObjectFilenames)) {
+    auto CovMappingBufOrErr = MemoryBuffer::getFileOrSTDIN(File.value());
     if (std::error_code EC = CovMappingBufOrErr.getError())
       return errorCodeToError(EC);
+    StringRef Arch = Arches.empty() ? StringRef() : Arches[File.index()];
     auto CoverageReaderOrErr =
         BinaryCoverageReader::create(CovMappingBufOrErr.get(), Arch);
     if (Error E = CoverageReaderOrErr.takeError())

test/tools/llvm-cov/universal-binary.c

@@ -7,9 +7,18 @@ int main(int argc, const char *argv[]) {}
 // RUN: llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch x86_64 | FileCheck %s
 // RUN: llvm-cov export %S/Inputs/universal-binary -instr-profile %t.profdata -arch x86_64 2>&1 | FileCheck %S/Inputs/universal-binary.json
 
+// RUN: llvm-cov report %S/Inputs/universal-binary -arch x86_64 -object %S/Inputs/templateInstantiations.covmapping -arch i386 -instr-profile %t.profdata 2>&1 | FileCheck %s --check-prefix=COMBINED
+// COMBINED: showTemplateInstantiations.cpp
+// COMBINED-NEXT: universal-binary.c
 
 // RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch i386 2>&1 | FileCheck --check-prefix=WRONG-ARCH %s
 // WRONG-ARCH: Failed to load coverage
 
+// RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch definitly_a_made_up_architecture 2>&1 | FileCheck --check-prefix=MADE-UP-ARCH %s
+// MADE-UP-ARCH: Unknown architecture: definitly_a_made_up_architecture
+
+// RUN: not llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -filename-equivalence %s -arch=x86_64 -arch=x86_64 2>&1 | FileCheck --check-prefix=TOO-MANY-ARCH %s
+// TOO-MANY-ARCH: Number of architectures doesn't match the number of objects
+//
 // RUN: not llvm-cov report -instr-profile %t.profdata 2>&1 | FileCheck --check-prefix=MISSING-BINARY %s
 // MISSING-BINARY: No filenames specified!

tools/llvm-cov/CodeCoverage.cpp

@@ -133,7 +133,7 @@ private:
   StringMap<std::string> RemappedFilenames;
 
   /// The architecture the coverage mapping data targets.
-  std::string CoverageArch;
+  std::vector<StringRef> CoverageArches;
 
   /// A cache for demangled symbols.
   DemangleCache DC;
@@ -329,7 +329,7 @@ std::unique_ptr<CoverageMapping> CodeCoverageTool::load() {
       warning("profile data may be out of date - object is newer",
               ObjectFilename);
   auto CoverageOrErr =
-      CoverageMapping::load(ObjectFilenames, PGOFilename, CoverageArch);
+      CoverageMapping::load(ObjectFilenames, PGOFilename, CoverageArches);
   if (Error E = CoverageOrErr.takeError()) {
     error("Failed to load coverage: " + toString(std::move(E)),
           join(ObjectFilenames.begin(), ObjectFilenames.end(), ", "));
@@ -499,8 +499,8 @@ int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
       cl::desc(
           "File with the profile data obtained after an instrumented run"));
 
-  cl::opt<std::string> Arch(
-      "arch", cl::desc("architecture of the coverage mapping binary"));
+  cl::list<std::string> Arches(
+      "arch", cl::desc("architectures of the coverage mapping binaries"));
 
   cl::opt<bool> DebugDump("dump", cl::Optional,
                           cl::desc("Show internal debug dump"));
@@ -632,12 +632,19 @@ int CodeCoverageTool::run(Command Cmd, int argc, const char **argv) {
       Filters.push_back(std::unique_ptr<CoverageFilter>(StatFilterer));
     }
 
-    if (!Arch.empty() &&
-        Triple(Arch).getArch() == llvm::Triple::ArchType::UnknownArch) {
-      error("Unknown architecture: " + Arch);
-      return 1;
+    if (!Arches.empty()) {
+      for (const std::string &Arch : Arches) {
+        if (Triple(Arch).getArch() == llvm::Triple::ArchType::UnknownArch) {
+          error("Unknown architecture: " + Arch);
+          return 1;
+        }
+        CoverageArches.emplace_back(Arch);
+      }
+      if (CoverageArches.size() != ObjectFilenames.size()) {
+        error("Number of architectures doesn't match the number of objects");
+        return 1;
+      }
     }
-    CoverageArch = Arch;
 
     for (const std::string &File : InputSourceFiles)
       collectPaths(File);