[Support] Add a DataExtractor constructor that takes ArrayRef<uint8_t>

The new constructor can simplify some llvm-readobj call sites.

Reviewed By: grimar, dblaikie

Differential Revision: https://reviews.llvm.org/D67797

llvm-svn: 372473

Author: MaskRay

llvm/include/llvm/Support/DataExtractor.h

@@ -82,6 +82,11 @@ class DataExtractor {
   /// valid.
   DataExtractor(StringRef Data, bool IsLittleEndian, uint8_t AddressSize)
     : Data(Data), IsLittleEndian(IsLittleEndian), AddressSize(AddressSize) {}
+  DataExtractor(ArrayRef<uint8_t> Data, bool IsLittleEndian,
+                uint8_t AddressSize)
+      : Data(StringRef(reinterpret_cast<const char *>(Data.data()),
+                       Data.size())),
+        IsLittleEndian(IsLittleEndian), AddressSize(AddressSize) {}
 
   /// Get the data pointed to by this extractor.
   StringRef getData() const { return Data; }

llvm/tools/llvm-readobj/DwarfCFIEHPrinter.h

@@ -114,11 +114,9 @@ void PrinterContext<ELFT>::printEHFrameHdr(uint64_t EHFrameHdrOffset,
     W.printString("Corresponding Section", *SectionName);
   }
 
-  DataExtractor DE(
-      StringRef(reinterpret_cast<const char *>(Obj->base()) + EHFrameHdrOffset,
-                EHFrameHdrSize),
-      ELFT::TargetEndianness == support::endianness::little,
-      ELFT::Is64Bits ? 8 : 4);
+  DataExtractor DE(makeArrayRef(Obj->base() + EHFrameHdrOffset, EHFrameHdrSize),
+                   ELFT::TargetEndianness == support::endianness::little,
+                   ELFT::Is64Bits ? 8 : 4);
 
   DictScope D(W, "Header");
   uint64_t Offset = 0;

llvm/tools/llvm-readobj/ELFDumper.cpp

@@ -4639,10 +4639,9 @@ void GNUStyle<ELFT>::printNotes(const ELFFile<ELFT> *Obj) {
         OS << "    " << N.Type << ":\n        " << N.Value << '\n';
     } else if (Name == "CORE") {
       if (Type == ELF::NT_FILE) {
-        DataExtractor DescExtractor(
-            StringRef(reinterpret_cast<const char *>(Descriptor.data()),
-                      Descriptor.size()),
-            ELFT::TargetEndianness == support::little, sizeof(Elf_Addr));
+        DataExtractor DescExtractor(Descriptor,
+                                    ELFT::TargetEndianness == support::little,
+                                    sizeof(Elf_Addr));
         Expected<CoreNote> Note = readCoreNote(DescExtractor);
         if (Note)
           printCoreNote<ELFT>(OS, *Note);
@@ -4836,10 +4835,7 @@ void DumpStyle<ELFT>::printNonRelocatableStackSizes(
     const Elf_Shdr *ElfSec = Obj->getSection(Sec.getRawDataRefImpl());
     ArrayRef<uint8_t> Contents =
         unwrapOrError(this->FileName, EF->getSectionContents(ElfSec));
-    DataExtractor Data(
-        StringRef(reinterpret_cast<const char *>(Contents.data()),
-                  Contents.size()),
-        Obj->isLittleEndian(), sizeof(Elf_Addr));
+    DataExtractor Data(Contents, Obj->isLittleEndian(), sizeof(Elf_Addr));
     // A .stack_sizes section header's sh_link field is supposed to point
     // to the section that contains the functions whose stack sizes are
     // described in it.
@@ -4937,10 +4933,7 @@ void DumpStyle<ELFT>::printRelocatableStackSizes(
     RelocationResolver Resolver;
     std::tie(IsSupportedFn, Resolver) = getRelocationResolver(*Obj);
     auto Contents = unwrapOrError(this->FileName, StackSizesSec.getContents());
-    DataExtractor Data(
-        StringRef(reinterpret_cast<const char *>(Contents.data()),
-                  Contents.size()),
-        Obj->isLittleEndian(), sizeof(Elf_Addr));
+    DataExtractor Data(Contents, Obj->isLittleEndian(), sizeof(Elf_Addr));
     for (const RelocationRef &Reloc : RelocSec.relocations()) {
       if (!IsSupportedFn(Reloc.getType()))
         reportError(createStringError(
@@ -5831,10 +5824,9 @@ void LLVMStyle<ELFT>::printNotes(const ELFFile<ELFT> *Obj) {
         W.printString(N.Type, N.Value);
     } else if (Name == "CORE") {
       if (Type == ELF::NT_FILE) {
-        DataExtractor DescExtractor(
-            StringRef(reinterpret_cast<const char *>(Descriptor.data()),
-                      Descriptor.size()),
-            ELFT::TargetEndianness == support::little, sizeof(Elf_Addr));
+        DataExtractor DescExtractor(Descriptor,
+                                    ELFT::TargetEndianness == support::little,
+                                    sizeof(Elf_Addr));
         Expected<CoreNote> Note = readCoreNote(DescExtractor);
         if (Note)
           printCoreNoteLLVMStyle(*Note, W);