1 files changed, 143 insertions, 0 deletions
diff --git a/lib/Object/FunctionIndexObjectFile.cpp b/lib/Object/FunctionIndexObjectFile.cpp
new file mode 100644
index 0000000000000..fe111de1a9c87
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+++ b/lib/Object/FunctionIndexObjectFile.cpp
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+//===- FunctionIndexObjectFile.cpp - Function index file implementation ---===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Part of the FunctionIndexObjectFile class implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/FunctionIndexObjectFile.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/IR/FunctionInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+using namespace object;
+
+FunctionIndexObjectFile::FunctionIndexObjectFile(
+    MemoryBufferRef Object, std::unique_ptr<FunctionInfoIndex> I)
+    : SymbolicFile(Binary::ID_FunctionIndex, Object), Index(std::move(I)) {}
+
+FunctionIndexObjectFile::~FunctionIndexObjectFile() {}
+
+std::unique_ptr<FunctionInfoIndex> FunctionIndexObjectFile::takeIndex() {
+  return std::move(Index);
+}
+
+ErrorOr<MemoryBufferRef>
+FunctionIndexObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
+  for (const SectionRef &Sec : Obj.sections()) {
+    StringRef SecName;
+    if (std::error_code EC = Sec.getName(SecName))
+      return EC;
+    if (SecName == ".llvmbc") {
+      StringRef SecContents;
+      if (std::error_code EC = Sec.getContents(SecContents))
+        return EC;
+      return MemoryBufferRef(SecContents, Obj.getFileName());
+    }
+  }
+
+  return object_error::bitcode_section_not_found;
+}
+
+ErrorOr<MemoryBufferRef>
+FunctionIndexObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
+  sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
+  switch (Type) {
+  case sys::fs::file_magic::bitcode:
+    return Object;
+  case sys::fs::file_magic::elf_relocatable:
+  case sys::fs::file_magic::macho_object:
+  case sys::fs::file_magic::coff_object: {
+    ErrorOr<std::unique_ptr<ObjectFile>> ObjFile =
+        ObjectFile::createObjectFile(Object, Type);
+    if (!ObjFile)
+      return ObjFile.getError();
+    return findBitcodeInObject(*ObjFile->get());
+  }
+  default:
+    return object_error::invalid_file_type;
+  }
+}
+
+// Looks for function index in the given memory buffer.
+// returns true if found, else false.
+bool FunctionIndexObjectFile::hasFunctionSummaryInMemBuffer(
+    MemoryBufferRef Object, DiagnosticHandlerFunction DiagnosticHandler) {
+  ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
+  if (!BCOrErr)
+    return false;
+
+  return hasFunctionSummary(BCOrErr.get(), DiagnosticHandler);
+}
+
+// Parse function index in the given memory buffer.
+// Return new FunctionIndexObjectFile instance containing parsed
+// function summary/index.
+ErrorOr<std::unique_ptr<FunctionIndexObjectFile>>
+FunctionIndexObjectFile::create(MemoryBufferRef Object,
+                                DiagnosticHandlerFunction DiagnosticHandler,
+                                bool IsLazy) {
+  std::unique_ptr<FunctionInfoIndex> Index;
+
+  ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
+  if (!BCOrErr)
+    return BCOrErr.getError();
+
+  ErrorOr<std::unique_ptr<FunctionInfoIndex>> IOrErr = getFunctionInfoIndex(
+      BCOrErr.get(), DiagnosticHandler, IsLazy);
+
+  if (std::error_code EC = IOrErr.getError())
+    return EC;
+
+  Index = std::move(IOrErr.get());
+
+  return llvm::make_unique<FunctionIndexObjectFile>(Object, std::move(Index));
+}
+
+// Parse the function summary information for function with the
+// given name out of the given buffer. Parsed information is
+// stored on the index object saved in this object.
+std::error_code FunctionIndexObjectFile::findFunctionSummaryInMemBuffer(
+    MemoryBufferRef Object, DiagnosticHandlerFunction DiagnosticHandler,
+    StringRef FunctionName) {
+  sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
+  switch (Type) {
+  case sys::fs::file_magic::bitcode: {
+    return readFunctionSummary(Object, DiagnosticHandler, FunctionName,
+                               std::move(Index));
+  }
+  default:
+    return object_error::invalid_file_type;
+  }
+}
+
+// Parse the function index out of an IR file and return the function
+// index object if found, or nullptr if not.
+ErrorOr<std::unique_ptr<FunctionInfoIndex>>
+llvm::getFunctionIndexForFile(StringRef Path,
+                              DiagnosticHandlerFunction DiagnosticHandler) {
+  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
+      MemoryBuffer::getFileOrSTDIN(Path);
+  std::error_code EC = FileOrErr.getError();
+  if (EC)
+    return EC;
+  MemoryBufferRef BufferRef = (FileOrErr.get())->getMemBufferRef();
+  ErrorOr<std::unique_ptr<object::FunctionIndexObjectFile>> ObjOrErr =
+      object::FunctionIndexObjectFile::create(BufferRef, DiagnosticHandler);
+  EC = ObjOrErr.getError();
+  if (EC)
+    return EC;
+
+  object::FunctionIndexObjectFile &Obj = **ObjOrErr;
+  return Obj.takeIndex();
+}